merge trunk

108 files changed, 5508 insertions, 2419 deletions

diff --git a/ChangeLog b/ChangeLog
index dfe776c..bafd366 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,153 @@
+2012-10-16  Donal K. Fellows  <dkf@users.sf.net>
+
+	IMPLEMENTATION OF TIP#405
+
+	New commands for applying a transformation to the elements of a list
+	to produce another list (the [lmap] command) and to the mappings of a
+	dictionary to produce another dictionary (the [dict map] command). In
+	both cases, a [continue] will cause the skipping of an element/pair,
+	and a [break] will terminate the construction early and successfully.
+
+	* generic/tclCmdAH.c (Tcl_LmapObjCmd, TclNRLmapCmd): Implementation of
+	the new [lmap] command, based on (and sharing much of) [foreach].
+	* generic/tclDictObj.c (DictMapNRCmd): Implementation of the new [dict
+	map] subcommand, based on (and sharing much of) [dict for].
+	* generic/tclCompCmds.c (TclCompileLmapCmd, TclCompileDictMapCmd):
+	Compilation engines for [lmap] and [dict map].
+
+	IMPLEMENTATION OF TIP#400
+
+	* generic/tclZlib.c: Allow the specification of a compression
+	dictionary (a binary blob used to seed the compression engine) in both
+	streams and channel transformations. Also some reorganization to allow
+	for getting gzip header dictionaries and controlling buffering levels
+	in channel transformations (allowing a trade-off between formal
+	correctness and speed).
+	(Tcl_ZlibStreamSetCompressionDictionary): New C API to allow setting
+	the compression dictionary without using a Tcl script.
+
+2012-10-14  Jan Nijtmans  <nijtmans@users.sf.net>
+
+	* generic/tclDictObj.c: [Bug 3576509]: ::tcl::Bgerror crashes with
+	* generic/tclEvent.c:    invalid arguments. Better fix, which helps
+	for all Tcl_DictObjGet() calls in Tcl's source code.
+
+2012-10-13  Jan Nijtmans  <nijtmans@users.sf.net>
+
+	* generic/tclEvent.c: [Bug 3576509]: tcl::Bgerror crashes with invalid
+	arguments
+
+2012-10-06  Jan Nijtmans  <nijtmans@users.sf.net>
+
+	* win/Makefile.in: [Bug 2459774]: tcl/win/Makefile.in not compatible
+	with msys 0.8.
+
+2012-10-03  Don Porter  <dgp@users.sourceforge.net>
+
+	* generic/tclIO.c:	When checking for std channels being closed,
+	compare the channel state, not the channel itself so that stacked
+	channels do not cause trouble.
+
+2012-09-26  Reinhard Max  <max@suse.de>
+
+	* generic/tclIOSock.c (TclCreateSocketAddress): Work around a bug in
+	getaddrinfo() on OSX that caused name resolution to fail for [socket
+	-server foo -myaddr localhost 0].
+
+2012-09-20  Jan Nijtmans  <nijtmans@users.sf.net>
+
+	* win/configure.in: New import libraries for zlib 1.2.7, usable for
+	* win/configure:    all win32/win64 compilers
+	* compat/zlib/win32/zdll.lib:
+	* compat/zlib/win64/zdll.lib:
+
+	* win/tclWinDde.c: [FRQ 3527238]: Full unicode support for dde. Dde
+	version is now 1.4.0b2.
+	***POTENTIAL INCOMPATIBILITY***
+
+2012-09-19  Jan Nijtmans  <nijtmans@users.sf.net>
+
+	* generic/tcl.h:  Make Tcl_Interp a fully opaque structure if
+	TCL_NO_DEPRECATED is set (TIP 330 and 336).
+	* win/nmakehlp.c: Let "nmakehlp -V" start searching digits after the
+	found match (suggested by Harald Oehlmann).
+
+2012-09-07  Harald Oehlmann  <oehhar@users.sf.net>
+
+	*** 8.6b3 TAGGED FOR RELEASE ***
+
+	IMPLEMENTATION OF TIP#404.
+
+	* library/msgcat/msgcat.tcl:	[FRQ 3544988]: New commands [mcflset]
+	* library/msgcat/pkgIndex.tcl:	and [mcflmset] to set mc entries with
+	* unix/Makefile.in:		implicit message file locale.
+	* win/Makefile.in:		Bump to 1.5.0.
+
+2012-08-25  Donal K. Fellows  <dkf@users.sf.net>
+
+	* library/msgs/uk.msg: [Bug 3561330]: Use the correct full name of
+	March in Ukrainian. Thanks to Mikhail Teterin for reporting.
+
+2012-08-23  Jan Nijtmans  <nijtmans@users.sf.net>
+
+	* generic/tclBinary.c: [Bug 3496014]: Unecessary memset() in
+	Tcl_SetByteArrayObj().
+
+2012-08-20  Don Porter  <dgp@users.sourceforge.net>
+
+	* generic/tclPathObj.c:	[Bug 3559678]: Fix bad filename normalization
+	when the last component is the empty string.
+
+2012-08-20  Jan Nijtmans  <nijtmans@users.sf.net>
+
+	* win/tclWinPort.h:  Remove wrapper macro for ntohs(): unnecessary,
+	because it doesn't require an initialized winsock_2 library. See:
+	<http://msdn.microsoft.com/en-us/library/windows/desktop/ms740075%28v=vs.85%29.aspx>
+	* win/tclWinSock.c:
+	* generic/tclStubInit.c:
+
+2012-08-17  Jan Nijtmans  <nijtmans@users.sf.net>
+
+	* win/nmakehlp.c: Add "-V<num>" option, in order to be able to detect
+	partial version numbers.
+
+2012-08-15  Jan Nijtmans  <nijtmans@users.sf.net>
+
+	* win/buildall.vc.bat: Only build the threaded builds by default
+	* win/rules.vc:        Some code cleanup
+
+2010-08-13  Stuart Cassoff  <stwo@users.sourceforge.net>
+
+	* unix/tclUnixCompat.c: [Bug 3555454]: Rearrange a bit to quash
+	'declared but never defined' compiler warnings.
+
+2012-08-13  Jan Nijtmans  <nijtmans@users.sf.net>
+
+	* compat/zlib/win64/zlib1.dll:  Add 64-bit build of zlib1.dll, and use
+	* compat/zlib/win64/zdll.lib:   it for the dynamic mingw-w64 build.
+	* win/Makefile.in:
+	* win/configure.in:
+	* win/configure:
+
+2012-08-09  Reinhard Max  <max@suse.de>
+
+	* tests/http.test: Fix http-3.29 for machines without IPv6 support.
+
+2010-08-08  Stuart Cassoff  <stwo@users.sourceforge.net>
+
+	* unix/tclUnixCompat.c: Change one '#ifdef' to '#if defined()' for
+	improved consistency within the file.
+
+2012-08-08  Jan Nijtmans  <nijtmans@users.sf.net>
+
+	* generic/tclfileName.c: [Bug #1536227]: Cygwin network pathname
+	* tests/fileName.test:   support
+
+2012-08-07  Don Porter  <dgp@users.sourceforge.net>
+
+	* generic/tclIOUtil.c:	[Bug 3554250]: Overlooked one field of cleanup
+	in the thread exit handler for the filesystem subsystem.
+
 2012-07-31  Donal K. Fellows  <dkf@users.sf.net>
 
 	* generic/tclInterp.c (Tcl_GetInterpPath):
@@ -34,6 +184,21 @@
 	* win/tclWinPipe.c: [Bug 3547994]: Abandon the synchronous Windows
 	pipe driver to its fate when needed to honour TIP#398.
 
+2012-07-24  Trevor Davel  <twylite@crypt.co.za>
+
+	* win/tclWinSock.c: [Bug: 3545363]: Loop over multiple underlying file
+	descriptors for a socket where required (TcpCloseProc, SocketProc).
+	Refactor socket/descriptor setup to manage linked list operations in
+	one place. Fix memory leak in socket close (TcpCloseProc) and related
+	dangling pointers in SocketEventProc.
+
+2012-07-19  Reinhard Max  <max@suse.de>
+
+	* win/tclWinSock.c (TcpAccept): [Bug: 3545363]: Use a large enough
+	buffer for accept()ing IPv6 connections. Fix conversion of host and
+	port for passing to the accept proc to be independent of the IP
+	version.
+
 2012-07-23  Alexandre Ferrieux  <ferrieux@users.sourceforge.net>
 
 	* generic/tclIO.c: [Bug 3545365]: Never try a bg-flush  on a dead
@@ -106,7 +271,7 @@
 
 	* library/msgcat/msgcat.tcl:   Add tn, ro_MO and ru_MO to msgcat.
 
-2012-06-29  Harald Oehlmann <harald.oehlmann@elmicron.de>
+2012-06-29  Harald Oehlmann <oehhar@users.sf.net>
 
 	* library/msgcat/msgcat.tcl:	[Bug 3536888]: Locale guessing of
 	* library/msgcat/pkgIndex.tcl:	msgcat fails on (some) Windows 7. Bump
@@ -170,9 +335,9 @@
 2012-06-11  Don Porter  <dgp@users.sourceforge.net>
 
 	* generic/tclBasic.c:	[Bug 3532959]: Make sure the lifetime
-	* generic/tclProc.c:	management of entries in the linePBodyPtr hash
-	* tests/proc.test:	table can tolerate either order of teardown,
-	interp first, or Proc first.
+	* generic/tclProc.c:	management of entries in the linePBodyPtr
+	* tests/proc.test:	hash table can tolerate either order of
+	teardown, interp first, or Proc first.
 
 2012-06-08  Don Porter  <dgp@users.sourceforge.net>
 
@@ -518,8 +683,8 @@
 
 2012-04-04  Jan Nijtmans  <nijtmans@users.sf.net>
 
-	* win/tclWinSock.c: [Bug 510001]: TclSockMinimumBuffers needs plat imp
-	* generic/tclIOSock.c:
+	* win/tclWinSock.c:	[Bug 510001]: TclSockMinimumBuffers needs
+	* generic/tclIOSock.c:	platform implementation.
 	* generic/tclInt.decls:
 	* generic/tclIntDecls.h:
 	* generic/tclStubInit.c:
@@ -948,7 +1113,7 @@
 
 2011-11-22  Jan Nijtmans  <nijtmans@users.sf.net>
 
-	* win/tclWinPort.h: [Bug 2935503]: Windows: [file mtime] sets wrong
+	* win/tclWinPort.h: [Bug 3354324]: Windows: [file mtime] sets wrong
 	* win/tclWinFile.c: time (VS2005+ only).
 	* generic/tclTest.c:
 
diff --git a/README b/README
index 0442a0e..56f7e38 100644
--- a/README
+++ b/README
@@ -1,5 +1,5 @@
 README:  Tcl
-    This is the Tcl 8.6b2 source distribution.
+    This is the Tcl 8.6b3 source distribution.
 	http://tcl.sourceforge.net/
     You can get any source release of Tcl from the file distributions
     link at the above URL.
diff --git a/changes b/changes
index 78673db..b902445 100644
--- a/changes
+++ b/changes
@@ -7995,7 +7995,7 @@ like "nano()" instead of parsing as "nan o()" with missing op (duquette,porter)
 
 2011-10-31 (bug fix)[3414754] EIAS violation in fs paths (porter)
 
-2011-11-22 (bug fix)[2935503] Win: [file mtime] sets wrong time (nijtmans)
+2011-11-22 (bug fix)[3354324] Win: [file mtime] sets wrong time (nijtmans)
 
 2011-11-30 (bug fix)[967195] Simply args passed to child processes (nijtmans)
 => tcltest 2.3.4
@@ -8023,8 +8023,6 @@ like "nano()" instead of parsing as "nan o()" with missing op (duquette,porter)
 2012-02-02 (bug fix)[2974459,2879351,1951574,1852572,1661378,1613456] Fix
 problems where [file *able] would return false results on Win/Samba (porter)
 
-2012-02-02 (update)[3464401] Support Unicode 6.1 (nijtmans)
-
 2012-02-06 (bug fix)[3484621] bump bytecode epoch on exec traces (kuhn,sofer)
 
 2012-02-15 (bug fix)[3487626] crash compiling [dict for] (fellows)
@@ -8094,7 +8092,6 @@ problems where [file *able] would return false results on Win/Samba (porter)
 and Tcl_FSMountsChanged(). (porter)
 
 2012-06-29 (bug fix)[3536888] fix locale guessing (oehlmann,nijtmans)
-=> msgcat 1.4.5
 
 2012-07-05 (bug fix)[1189293] make "<<" redirect binary safe (porter)
 
@@ -8105,6 +8102,17 @@ and Tcl_FSMountsChanged(). (porter)
 
 2012-07-25 (bug fix)[3546275] [auto_execok] search match [exec] (danckaert)
 
+2012-07-27 (update)[3464401] Support Unicode 6.2 (nijtmans)
+
+2012-08-20 (bug fix)[3559678] [file normalize] EIAS failure (phao,dgp)
+
+2012-08-25 (bug fix)[3561330] Ukranian translation of "March" (teterin)
+
+2012-09-12 (TIP 404) New msgcat commands [mcflset], [mcflmset] (oehlmann)
+=> msgcat 1.5.0
+
 Many revisions to better support a Cygwin environment (nijtmans)
 
---- Released 8.6b3, July 30, 2012 --- See ChangeLog for details ---
+Dropped support for OS X versions less than 10.4 (Tiger) (fellows)
+
+--- Released 8.6b3, September 18, 2012 --- See ChangeLog for details ---
diff --git a/compat/zlib/win32/zdll.lib b/compat/zlib/win32/zdll.lib
index 4e53491..669b186 100644
--- a/compat/zlib/win32/zdll.lib
+++ b/compat/zlib/win32/zdll.lib
diff --git a/compat/zlib/win64/zdll.lib b/compat/zlib/win64/zdll.lib
new file mode 100644
index 0000000..d7dfb09
--- /dev/null
+++ b/compat/zlib/win64/zdll.lib
diff --git a/compat/zlib/win64/zlib1.dll b/compat/zlib/win64/zlib1.dll
new file mode 100644
index 0000000..631439b
--- /dev/null
+++ b/compat/zlib/win64/zlib1.dll
diff --git a/doc/TclZlib.3 b/doc/TclZlib.3
index 1b5e892..ebd294b 100644
--- a/doc/TclZlib.3
+++ b/doc/TclZlib.3
@@ -49,9 +49,11 @@ int
 .sp
 int
 \fBTcl_ZlibStreamGet\fR(\fIzshandle, dataObj, count\fR)
+.sp
+\fBTcl_ZlibStreamSetCompressionDictionary\fR(\fIzshandle, compDict\fR)
 .fi
 .SH ARGUMENTS
-.AS Tcl_ZlibStream *zshandlePtr out
+.AS Tcl_ZlibStream zshandle in
 .AP Tcl_Interp *interp in
 The interpreter to store resulting compressed or uncompressed data in. Also
 where any error messages are written. For \fBTcl_ZlibStreamInit\fR, this can
@@ -108,6 +110,13 @@ trailer demanded by the format is written.
 .AP int count in
 The maximum number of bytes to get from the stream, or -1 to get all remaining
 bytes from the stream's buffers.
+.AP Tcl_Obj *compDict in
+A byte array object that is the compression dictionary to use with the stream.
+Note that this is \fInot a Tcl dictionary\fR, and it is recommended that this
+only ever be used with streams that were created with their \fIformat\fR set
+to \fBTCL_ZLIB_FORMAT_ZLIB\fR because the other formats have no mechanism to
+indicate whether a compression dictionary was present other than to fail on
+decompression.
 .BE
 .SH DESCRIPTION
 These functions form the interface from the Tcl library to the Zlib
@@ -172,6 +181,25 @@ uncompressed data according to the format, and \fBTcl_ZlibStreamEof\fR returns
 a boolean value indicating whether the end of the uncompressed data has been
 reached.
 .PP
+\fBTcl_ZlibStreamSetCompressionDictionary\fR is used to control the
+compression dictionary used with the stream, a compression dictionary being an
+array of bytes (such as might be created with \fBTcl_NewByteArrayObj\fR) that
+is used to initialize the compression engine rather than leaving it to create
+it on the fly from the data being compressed. Setting a compression dictionary
+allows for more efficient compression in the case where the start of the data
+is highly regular, but it does require both the compressor and the
+decompressor to agreee on the value to use. Compression dictionaries are only
+fully supported for zlib-format data; on compression, they must be set before
+any data is sent in with \fBTcl_ZlibStreamPut\fR, and on decompression they
+should be set when \fBTcl_ZlibStreamGet\fR produces an \fBerror\fR with its
+\fB\-errorcode\fR set to
+.QW "\fBZLIB NEED_DICT\fI code\fR" ;
+the \fIcode\fR will be the Adler-32 checksum (see \fBTcl_ZlibAdler32\fR) of
+the compression dictionary sought. (Note that this is only true for
+zlib-format streams; gzip streams ignore compression dictionaries as the
+format specification doesn't permit them, and raw streams just produce a data
+error if the compression dictionary is missing or incorrect.)
+.PP
 If you wish to clear a stream and reuse it for a new compression or
 decompression action, \fBTcl_ZlibStreamReset\fR will do this and return a
 normal Tcl result code to indicate whether it was successful; if the stream is
diff --git a/doc/dde.n b/doc/dde.n
index e4b51b7..3fe0f87 100644
--- a/doc/dde.n
+++ b/doc/dde.n
@@ -83,12 +83,14 @@ asynchronous invocation.  The command returns an error message if the
 script did not run, unless the \fB\-async\fR flag was used, in which case
 the command returns immediately with no error.
 .VS 8.6
-The \fB\-binary\fR option treats \fIdata\fR as binary data, otherwise an utf-8
-string is sent.  Combining \fB-binary\fR with the result of
-\fBencoding convertto\fR may be used to send data in arbitrary encodings.
+Without the \fB\-binary\fR option all data will be sent in unicode. For
+dde clients which don't implement the CF_UNICODE clipboard format, this
+will automatically be translated to the system encoding. You can use 
+the \fB\-binary\fR option in combination with the result of
+\fBencoding convertto\fR to send data in any other encoding.
 .VE 8.6
 .TP
-\fBdde poke ?\fB\-binary\fR? \fIservice topic item data\fR
+\fBdde poke\fR ?\fB\-binary\fR? \fIservice topic item data\fR
 .
 \fBdde poke\fR passes the \fIdata\fR to the server indicated by
 \fIservice\fR using the \fItopic\fR and \fIitem\fR specified.  Typically,
@@ -98,8 +100,11 @@ on.  The \fIitem\fR is also application specific and is often not used, but
 it must always be non-null.  The \fIdata\fR field is given to the remote
 application.
 .VS 8.6
-The \fB\-binary\fR option treats \fIdata\fR as binary data, otherwise an utf-8
-string is sent.
+Without the \fB\-binary\fR option all data will be sent in unicode. For
+dde clients which don't implement the CF_UNICODE clipboard format, this
+will automatically be translated to the system encoding. You can use 
+the \fB\-binary\fR option in combination with the result of
+\fBencoding convertto\fR to send data in any other encoding.
 .VE 8.6
 .TP
 \fBdde request\fR ?\fB\-binary\fR? \fIservice topic item\fR
diff --git a/doc/define.n b/doc/define.n
index 6bdd9c5..1c36ca3 100644
--- a/doc/define.n
+++ b/doc/define.n
@@ -152,7 +152,7 @@ and
 operates identically to
 .QW "\fBoo::objdefine \fIcls subcommand ...\fR" .
 .TP
-\fBsuperclass\fI ?\fI\-slotOperation\fR? \fR?\fIclassName ...\fR?
+\fBsuperclass\fR ?\fI\-slotOperation\fR? ?\fIclassName ...\fR?
 .VS
 This slot (see \fBSLOTTED DEFINITIONS\fR below)
 .VE
diff --git a/doc/dict.n b/doc/dict.n
index 361a112..3bd5530 100644
--- a/doc/dict.n
+++ b/doc/dict.n
@@ -147,6 +147,31 @@ keys are treated as if they map to an empty list, and it is legal for
 there to be no items to append to the list. It is an error for the
 value that the key maps to to not be representable as a list.
 .TP
+\fBdict map \fR{\fIkeyVar valueVar\fR} \fIdictionaryValue body\fR
+.
+This command applies a transformation to each element of a dictionary,
+returning a new dictionary. It takes three arguments: the first is a
+two-element list of variable names (for the key and value respectively of each
+mapping in the dictionary), the second the dictionary value to iterate across,
+and the third a script to be evaluated for each mapping with the key and value
+variables set appropriately (in the manner of \fBlmap\fR). In an iteration
+where the evaluated script completes normally (\fBTCL_OK\fR, as opposed to an
+\fBerror\fR, etc.) the result of the script is put into an accumulator
+dictionary using the key that is the current contents of the \fIkeyVar\fR
+variable at that point. The result of the \fBdict map\fB command is the
+accumulator dictionary after all keys have been iterated over.
+.RS
+.PP
+If the evaluation of the body for any particular step generates a \fBbreak\fR,
+no further pairs from the dictionary will be iterated over and the \fBdict
+map\fR command will terminate successfully immediately. If the evaluation of
+the body for a particular step generates a \fBcontinue\fR result, the current
+iteration is aborted and the accumulator dictionary is not modified. The order
+of iteration is the natural order of the dictionary (typically the order in
+which the keys were added to the dictionary; the order is the same as that
+used in \fBdict for\fR).
+.RE
+.TP
 \fBdict merge \fR?\fIdictionaryValue ...\fR?
 .
 Return a dictionary that contains the contents of each of the
@@ -408,9 +433,9 @@ puts $foo
 #    prints: \fIa b foo {a b} bar 2 baz 3\fR
 .CE
 .SH "SEE ALSO"
-append(n), array(n), foreach(n), incr(n), list(n), lappend(n), set(n)
+append(n), array(n), foreach(n), mapeach(n), incr(n), list(n), lappend(n), set(n)
 .SH KEYWORDS
-dictionary, create, update, lookup, iterate, filter
+dictionary, create, update, lookup, iterate, filter, map
 '\" Local Variables:
 '\" mode: nroff
 '\" End:
diff --git a/doc/lmap.n b/doc/lmap.n
new file mode 100644
index 0000000..880b05a
--- /dev/null
+++ b/doc/lmap.n
@@ -0,0 +1,85 @@
+'\"
+'\" Copyright (c) 2012 Trevor Davel
+'\"
+'\" See the file "license.terms" for information on usage and redistribution
+'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+'\" 
+.so man.macros
+.TH lmap n "" Tcl "Tcl Built-In Commands"
+.BS
+'\" Note:  do not modify the .SH NAME line immediately below!
+.SH NAME
+lmap \- Iterate over all elements in one or more lists and collect results
+.SH SYNOPSIS
+\fBlmap \fIvarname list body\fR
+.br
+\fBlmap \fIvarlist1 list1\fR ?\fIvarlist2 list2 ...\fR? \fIbody\fR
+.BE
+.SH DESCRIPTION
+.PP
+The \fBlmap\fR command implements a loop where the loop variable(s) take on
+values from one or more lists, and the loop returns a list of results
+collected from each iteration.
+.PP
+In the simplest case there is one loop variable, \fIvarname\fR, and one list,
+\fIlist\fR, that is a list of values to assign to \fIvarname\fR. The
+\fIbody\fR argument is a Tcl script. For each element of \fIlist\fR (in order
+from first to last), \fBlmap\fR assigns the contents of the element to
+\fIvarname\fR as if the \fBlindex\fR command had been used to extract the
+element, then calls the Tcl interpreter to execute \fIbody\fR. If execution of
+the body completes normally then the result of the body is appended to an
+accumulator list. \fBlmap\fR returns the accumulator list.
+.PP
+In the general case there can be more than one value list (e.g., \fIlist1\fR
+and \fIlist2\fR), and each value list can be associated with a list of loop
+variables (e.g., \fIvarlist1\fR and \fIvarlist2\fR). During each iteration of
+the loop the variables of each \fIvarlist\fR are assigned consecutive values
+from the corresponding \fIlist\fR. Values in each \fIlist\fR are used in order
+from first to last, and each value is used exactly once. The total number of
+loop iterations is large enough to use up all the values from all the value
+lists. If a value list does not contain enough elements for each of its loop
+variables in each iteration, empty values are used for the missing elements.
+.PP
+The \fBbreak\fR and \fBcontinue\fR statements may be invoked inside
+\fIbody\fR, with the same effect as in the \fBfor\fR and \fBforeach\fR
+commands. In these cases the body does not complete normally and the result is
+not appended to the accumulator list.
+.SH EXAMPLES
+.PP
+Zip lists together:
+.PP
+.CS
+set list1 {a b c d}
+set list2 {1 2 3 4}
+set zipped [\fBlmap\fR a $list1 b $list2 {list $a $b}] 
+# The value of zipped is "{a 1} {b 2} {c 3} {d 4}"
+.CE
+.PP
+Filter a list to remove odd values:
+.PP
+.CS
+set values {1 2 3 4 5 6 7 8}
+proc isEven {n} {expr {($n % 2) == 0}}
+set goodOnes [\fBlmap\fR x $values {expr {
+    [isEven $x] ? $x : [continue]
+}}]
+# The value of goodOnes is "2 4 6 8"
+.CE
+.PP
+Take a prefix from a list based on the contents of the list:
+.PP
+.CS
+set values {8 7 6 5 4 3 2 1}
+proc isGood {counter} {expr {$n > 3}}
+set prefix [\fBlmap\fR x $values {expr {
+    [isGood $x] ? $x : [break]
+}}]
+# The value of prefix is "8 7 6 5 4"
+.CE
+.SH "SEE ALSO"
+break(n), continue(n), for(n), foreach(n), while(n)
+.SH KEYWORDS
+foreach, iteration, list, loop, map
+'\" Local Variables:
+'\" mode: nroff
+'\" End:
diff --git a/doc/msgcat.n b/doc/msgcat.n
index 595c85f..af6be7f 100644
--- a/doc/msgcat.n
+++ b/doc/msgcat.n
@@ -13,7 +13,7 @@ msgcat \- Tcl message catalog
 .SH SYNOPSIS
 \fBpackage require Tcl 8.5\fR
 .sp
-\fBpackage require msgcat 1.4.5\fR
+\fBpackage require msgcat 1.5.0\fR
 .sp
 \fB::msgcat::mc \fIsrc-string\fR ?\fIarg arg ...\fR?
 .sp
@@ -29,6 +29,12 @@ msgcat \- Tcl message catalog
 .sp
 \fB::msgcat::mcmset \fIlocale src-trans-list\fR
 .sp
+.VS "TIP 404"
+\fB::msgcat::mcflset \fIsrc-string \fR?\fItranslate-string\fR?
+.sp
+\fB::msgcat::mcflmset \fIsrc-trans-list\fR
+.VE "TIP 404"
+.sp
 \fB::msgcat::mcunknown \fIlocale src-string\fR
 .BE
 .SH DESCRIPTION
@@ -131,6 +137,26 @@ translate-string ...\fR?} \fB::msgcat::mcmset\fR can be significantly
 faster than multiple invocations of \fB::msgcat::mcset\fR. The function
 returns the number of translations set.
 .TP
+\fB::msgcat::mcflset \fIsrc-string \fR?\fItranslate-string\fR?
+.VS "TIP 404"
+Sets the translation for \fIsrc-string\fR to \fItranslate-string\fR in the
+current namespace for the locale implied by the name of the message catalog
+being loaded via \fB::msgcat::mcload\fR.  If \fItranslate-string\fR is not
+specified, \fIsrc-string\fR is used for both.  The function returns
+\fItranslate-string\fR.
+.VE "TIP 404"
+.TP
+\fB::msgcat::mcflmset \fIsrc-trans-list\fR
+.VS "TIP 404"
+Sets the translation for multiple source strings in \fIsrc-trans-list\fR in
+the current namespace for the locale implied by the name of the message
+catalog being loaded via \fB::msgcat::mcload\fR. \fIsrc-trans-list\fR must
+have an even number of elements and is in the form {\fIsrc-string
+translate-string\fR ?\fIsrc-string translate-string ...\fR?}
+\fB::msgcat::mcflmset\fR can be significantly faster than multiple invocations
+of \fB::msgcat::mcflset\fR. The function returns the number of translations set.
+.VE "TIP 404"
+.TP
 \fB::msgcat::mcunknown \fIlocale src-string\fR
 .
 This routine is called by \fB::msgcat::mc\fR in the case when
@@ -286,15 +312,15 @@ cause peculiar behavior, such as marking the message file as
 .QW hidden
 on Unix file systems.
 .IP [3]
-The file contains a series of calls to \fBmcset\fR and
-\fBmcmset\fR, setting the necessary translation strings
+The file contains a series of calls to \fBmcflset\fR and
+\fBmcflmset\fR, setting the necessary translation strings
 for the language, likely enclosed in a \fBnamespace eval\fR
 so that all source strings are tied to the namespace of
 the package. For example, a short \fBes.msg\fR might contain:
 .PP
 .CS
 namespace eval ::mypackage {
-    \fB::msgcat::mcset\fR es "Free Beer!" "Cerveza Gracias!"
+    \fB::msgcat::mcflset\fR "Free Beer!" "Cerveza Gracias!"
 }
 .CE
 .SH "RECOMMENDED MESSAGE SETUP FOR PACKAGES"
diff --git a/doc/trace.n b/doc/trace.n
index 940a1e9..63ed1cb 100644
--- a/doc/trace.n
+++ b/doc/trace.n
@@ -143,7 +143,7 @@ error will occur.
 For \fBleave\fR and \fBleavestep\fR operations:
 .PP
 .CS
-\fIcommand command-string code result op\fR
+\fIcommandPrefix command-string code result op\fR
 .CE
 .PP
 \fICommand-string\fR gives the complete current command being
diff --git a/doc/zlib.n b/doc/zlib.n
index a4ff7f8..2610527 100644
--- a/doc/zlib.n
+++ b/doc/zlib.n
@@ -1,5 +1,5 @@
 '\"
-'\" Copyright (c) 2008 Donal K. Fellows
+'\" Copyright (c) 2008-2012 Donal K. Fellows
 '\"
 '\" See the file "license.terms" for information on usage and redistribution
 '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
@@ -170,6 +170,13 @@ the
 .QW "\fIoptions ...\fR"
 to the \fBzlib push\fR command:
 .TP
+\fB\-dictionary\fI binData\fR
+.VS "TIP 400"
+Sets the compression dictionary to use when working with compressing or
+decompressing the data to be \fIbinData\fR. Not valid for transformations that
+work with gzip-format data.
+.VE
+.TP
 \fB\-header\fI dictionary\fR
 .
 Passes a description of the gzip header to create, in the same format that
@@ -179,15 +186,33 @@ Passes a description of the gzip header to create, in the same format that
 .
 How hard to compress the data. Must be an integer from 0 (uncompressed) to 9
 (maximally compressed).
-'\".TP
-'\"\fB\-limit\fI readaheadLimit\fR
-'\".
-'\"The maximum number of bytes ahead to read.
-'\"\fITODO: not yet implemented!\fR
+.TP
+\fB\-limit\fI readaheadLimit\fR
+.
+The maximum number of bytes ahead to read when decompressing. This defaults to
+1, which ensures that data is always decompressed correctly, but may be
+increased to improve performance. This is more useful when the channel is
+non-blocking.
 .PP
 Both compressing and decompressing channel transformations add extra
-configuration options that may be accessed through \fBchan configure\fR. Each
-option is either a read-only or a write-only option. The options are:
+configuration options that may be accessed through \fBchan configure\fR. The
+options are:
+.TP
+\fB\-checksum\fI checksum\fR
+.
+This read-only option gets the current checksum for the uncompressed data that
+the compression engine has seen so far. It is valid for both compressing and
+decompressing transforms, but not for the raw inflate and deflate formats. The
+compression algorithm depends on what format is being produced or consumed.
+.TP
+\fB\-dictionary\fI binData\fR
+.VS "TIP 400"
+This read-write options gets or sets the compression dictionary to use when
+working with compressing or decompressing the data to be \fIbinData\fR. It is
+not valid for transformations that work with gzip-format data, and should not
+normally be set on compressing transformations other than at the point where
+the transformation is stacked.
+.VE
 .TP
 \fB\-flush\fI type\fR
 .
@@ -198,63 +223,80 @@ expensive flush respectively. Flushing degrades the compression ratio, but
 makes it easier for a decompressor to recover more of the file in the case of
 data corruption.
 .TP
-\fB\-checksum\fR
-.
-This read-only option gets the current checksum for the uncompressed data
-that the compression engine has seen so far. It is valid for both
-compressing and decompressing transforms, but not for the raw inflate
-and deflate formats. The compression algorithm depends on what
-format is being produced or consumed.
-.TP
-\fB\-header\fR
+\fB\-header\fI dictionary\fR
 .
 This read-only option, only valid for decompressing transforms that are
 processing gzip-format data, returns the dictionary describing the header read
 off the data stream.
+.TP
+\fB\-limit\fI readaheadLimit\fR
+.
+This read-write option is used by decompressing channels to control the
+maximum number of bytes ahead to read from the underlying data source. This
+defaults to 1, which ensures that data is always decompressed correctly, but
+may be increased to improve performance. This is more useful when the channel
+is non-blocking.
 .RE
 .SS "STREAMING SUBCOMMAND"
 .TP
-\fBzlib stream\fI mode\fR ?\fIlevel\fR?
+\fBzlib stream\fI mode\fR ?\fIoptions\fR?
 .
 Creates a streaming compression or decompression command based on the
 \fImode\fR, and return the name of the command. For a description of how that
 command works, see \fBSTREAMING INSTANCE COMMAND\fR below. The following modes
-are supported:
+and \fIoptions\fR are supported:
 .RS
 .TP
-\fBzlib stream compress\fR ?\fIlevel\fR?
+\fBzlib stream compress\fR ?\fB\-dictionary \fIbindata\fR? ?\fB\-level \fIlevel\fR?
 .
 The stream will be a compressing stream that produces zlib-format output,
 using compression level \fIlevel\fR (if specified) which will be an integer
-from 0 to 9.
+from 0 to 9,
+.VS "TIP 400"
+and the compression dictionary \fIbindata\fR (if specified).
+.VE
 .TP
-\fBzlib stream decompress\fR
+\fBzlib stream decompress\fR ?\fB\-dictionary \fIbindata\fR?
 .
 The stream will be a decompressing stream that takes zlib-format input and
 produces uncompressed output.
+.VS "TIP 400"
+If \fIbindata\fR is supplied, it is a compression dictionary to use if
+required.
+.VE
 .TP
-\fBzlib stream deflate\fR ?\fIlevel\fR?
+\fBzlib stream deflate\fR ?\fB\-dictionary \fIbindata\fR? ?\fB\-level \fIlevel\fR?
 .
 The stream will be a compressing stream that produces raw output, using
 compression level \fIlevel\fR (if specified) which will be an integer from 0
-to 9.
+to 9,
+.VS "TIP 400"
+and the compression dictionary \fIbindata\fR (if specified). Note that
+the raw compressed data includes no metadata about what compression
+dictionary was used, if any; that is a feature of the zlib-format data.
+.VE
 .TP
 \fBzlib stream gunzip\fR
 .
 The stream will be a decompressing stream that takes gzip-format input and
 produces uncompressed output.
 .TP
-\fBzlib stream gzip\fR ?\fIlevel\fR?
+\fBzlib stream gzip\fR ?\fB\-header \fIheader\fR? ?\fB\-level \fIlevel\fR?
 .
 The stream will be a compressing stream that produces gzip-format output,
 using compression level \fIlevel\fR (if specified) which will be an integer
-from 0 to 9.
-'\" TODO: Header dictionary!
+from 0 to 9, and the header descriptor dictionary \fIheader\fR (if specified;
+for keys see \fBzlib gzip\fR).
 .TP
-\fBzlib stream inflate\fR
+\fBzlib stream inflate\fR ?\fB\-dictionary \fIbindata\fR?
 .
 The stream will be a decompressing stream that takes raw compressed input and
 produces uncompressed output.
+.VS "TIP 400"
+If \fIbindata\fR is supplied, it is a compression dictionary to use. Note that
+there are no checks in place to determine whether the compression dictionary
+is correct.
+.VE
 .RE
 .SS "CHECKSUMMING SUBCOMMANDS"
 .TP
@@ -277,10 +319,10 @@ the transformed data.
 The full set of subcommands supported by a streaming instance command,
 \fIstream\fR, is as follows:
 .TP
-\fIstream \fBadd\fR ?\fIoption\fR? \fIdata\fR
+\fIstream \fBadd\fR ?\fIoption...\fR? \fIdata\fR
 .
 A short-cut for
-.QW "\fIstream \fBput \fIoption data\fR"
+.QW "\fIstream \fBput \fR?\fIoption...\fR? \fIdata\fR"
 followed by
 .QW "\fIstream \fBget\fR" .
 .TP
@@ -318,15 +360,27 @@ A short-cut for
 Return up to \fIcount\fR bytes from \fIstream\fR's internal buffers with the
 transformation applied. If \fIcount\fR is omitted, the entire contents of the
 buffers are returned.
+.
+\fIstream \fBheader\fR
+.
+Return the gzip header description dictionary extracted from the stream. Only
+supported for streams created with their \fImode\fR parameter set to
+\fBgunzip\fR.
 .TP
-\fIstream \fBput\fR ?\fIoption\fR? \fIdata\fR
+\fIstream \fBput\fR ?\fIoption...\fR? \fIdata\fR
 .
 Append the contents of the binary string \fIdata\fR to \fIstream\fR's internal
-buffers while applying the transformation. If present, \fIoption\fR must be
-one of the following (or an unambiguous prefix) which are used to modify the
+buffers while applying the transformation. The following \fIoption\fRs are
+supported (or an unambiguous prefix of them), which are used to modify the
 way in which the transformation is applied:
 .RS
 .TP
+\fB\-dictionary\fI binData\fR
+.VS "TIP 400"
+Sets the compression dictionary to use when working with compressing or
+decompressing the data to be \fIbinData\fR.
+.VE
+.TP
 \fB\-finalize\fR
 .
 Mark the stream as finished, ensuring that all bytes have been wholly
@@ -334,12 +388,22 @@ compressed or decompressed. For gzip streams, this also ensures that the
 footer is written to the stream. The stream will need to be reset before
 having more data written to it after this, though data can still be read out
 of the stream with the \fBget\fR subcommand.
+.RS
+.PP
+This option is mutually exclusive with the \fB\-flush\fR and \fB\-fullflush\fR
+options.
+.RE
 .TP
 \fB\-flush\fR
 .
 Ensure that a decompressor consuming the bytes that the current (compressing)
 stream is producing will be able to produce all the bytes that have been
 compressed so far, at some performance penalty.
+.RS
+.PP
+This option is mutually exclusive with the \fB\-finalize\fR and
+\fB\-fullflush\fR options.
+.RE
 .TP
 \fB\-fullflush\fR
 .
@@ -347,6 +411,11 @@ Ensure that not only can a decompressor handle all the bytes produced so far
 (as with \fB\-flush\fR above) but also that it can restart from this point if
 it detects that the stream is partially corrupt. This incurs a substantial
 performance penalty.
+.RS
+.PP
+This option is mutually exclusive with the \fB\-finalize\fR and \fB\-flush\fR
+options.
+.RE
 .RE
 .TP
 \fIstream \fBreset\fR
diff --git a/generic/tcl.decls b/generic/tcl.decls
index b421ae2..1829249 100644
--- a/generic/tcl.decls
+++ b/generic/tcl.decls
@@ -2318,6 +2318,12 @@ declare 629 {
     int Tcl_FSUnloadFile(Tcl_Interp *interp, Tcl_LoadHandle handlePtr)
 }
 
+# TIP #400
+declare 630 {
+    void Tcl_ZlibStreamSetCompressionDictionary(Tcl_ZlibStream zhandle,
+	    Tcl_Obj *compressionDictionaryObj)
+}
+
 # ----- BASELINE -- FOR -- 8.6.0 ----- #
 
 ##############################################################################
diff --git a/generic/tcl.h b/generic/tcl.h
index 729e521..3f9f06a 100644
--- a/generic/tcl.h
+++ b/generic/tcl.h
@@ -58,10 +58,10 @@ extern "C" {
 #define TCL_MAJOR_VERSION   8
 #define TCL_MINOR_VERSION   6
 #define TCL_RELEASE_LEVEL   TCL_BETA_RELEASE
-#define TCL_RELEASE_SERIAL  2
+#define TCL_RELEASE_SERIAL  3
 
 #define TCL_VERSION	    "8.6"
-#define TCL_PATCH_LEVEL	    "8.6b2"
+#define TCL_PATCH_LEVEL	    "8.6b3"
 
 /*
  *----------------------------------------------------------------------------
@@ -500,7 +500,9 @@ typedef unsigned TCL_WIDE_INT_TYPE	Tcl_WideUInt;
  * accessed with Tcl_GetObjResult() and Tcl_SetObjResult().
  */
 
-typedef struct Tcl_Interp {
+typedef struct Tcl_Interp
+#ifndef TCL_NO_DEPRECATED
+{
     /* TIP #330: Strongly discourage extensions from using the string
      * result. */
 #ifdef USE_INTERP_RESULT
@@ -517,8 +519,8 @@ typedef struct Tcl_Interp {
 				 * Tcl_Eval must free it before executing next
 				 * command. */
 #else
-    char *unused3 TCL_DEPRECATED_API("bad field access");
-    void (*unused4) (char *) TCL_DEPRECATED_API("bad field access");
+    char *resultDontUse; /* Don't use in extensions! */
+    void (*freeProcDontUse) (char *); /* Don't use in extensions! */
 #endif
 #ifdef USE_INTERP_ERRORLINE
     int errorLine TCL_DEPRECATED_API("use Tcl_GetErrorLine/Tcl_SetErrorLine");
@@ -526,9 +528,11 @@ typedef struct Tcl_Interp {
 				 * line number within the command where the
 				 * error occurred (1 if first line). */
 #else
-    int unused5 TCL_DEPRECATED_API("bad field access");
+    int errorLineDontUse; /* Don't use in extensions! */
 #endif
-} Tcl_Interp;
+}
+#endif /* TCL_NO_DEPRECATED */
+Tcl_Interp;
 
 typedef struct Tcl_AsyncHandler_ *Tcl_AsyncHandler;
 typedef struct Tcl_Channel_ *Tcl_Channel;
diff --git a/generic/tclBasic.c b/generic/tclBasic.c
index db365e3..7c08f2f 100644
--- a/generic/tclBasic.c
+++ b/generic/tclBasic.c
@@ -230,6 +230,7 @@ static const CmdInfo builtInCmds[] = {
     {"linsert",		Tcl_LinsertObjCmd,	NULL,			NULL,	1},
     {"list",		Tcl_ListObjCmd,		TclCompileListCmd,	NULL,	1},
     {"llength",		Tcl_LlengthObjCmd,	TclCompileLlengthCmd,	NULL,	1},
+    {"lmap",		Tcl_LmapObjCmd,		TclCompileLmapCmd,	TclNRLmapCmd,	1},
     {"lrange",		Tcl_LrangeObjCmd,	TclCompileLrangeCmd,	NULL,	1},
     {"lrepeat",		Tcl_LrepeatObjCmd,	NULL,			NULL,	1},
     {"lreplace",	Tcl_LreplaceObjCmd,	TclCompileLreplaceCmd,	NULL,	1},
@@ -8852,7 +8853,7 @@ NRCoroInjectObjCmd(
 
     return TCL_OK;
 }
-
+
 int
 TclNRInterpCoroutine(
     ClientData clientData,
diff --git a/generic/tclBinary.c b/generic/tclBinary.c
index a1e836e..3d8b24c 100644
--- a/generic/tclBinary.c
+++ b/generic/tclBinary.c
@@ -303,18 +303,16 @@ Tcl_SetByteArrayObj(
     TclFreeIntRep(objPtr);
     Tcl_InvalidateStringRep(objPtr);
 
-    length = (length < 0) ? 0 : length;
+    if (length < 0) {
+	length = 0;
+    }
     byteArrayPtr = ckalloc(BYTEARRAY_SIZE(length));
     byteArrayPtr->used = length;
     byteArrayPtr->allocated = length;
-    if (length) {
-	if (bytes) {
-	    memcpy(byteArrayPtr->bytes, bytes, (size_t) length);
-	} else {
-	    memset(byteArrayPtr->bytes, 0, (size_t) length);
-	}
-    }
 
+    if ((bytes != NULL) && (length > 0)) {
+	memcpy(byteArrayPtr->bytes, bytes, (size_t) length);
+    }
     objPtr->typePtr = &tclByteArrayType;
     SET_BYTEARRAY(objPtr, byteArrayPtr);
 }
diff --git a/generic/tclCkalloc.c b/generic/tclCkalloc.c
index 6443975..ab977cb 100644
--- a/generic/tclCkalloc.c
+++ b/generic/tclCkalloc.c
@@ -170,11 +170,15 @@ TclInitDbCkalloc(void)
  */
 
 int
-TclDumpMemoryInfo(ClientData clientData, int flags)
+TclDumpMemoryInfo(
+    ClientData clientData,
+    int flags)
 {
     char buf[1024];
 
-    if (clientData == NULL) { return 0; }
+    if (clientData == NULL) {
+        return 0;
+    }
     sprintf(buf,
 	    "total mallocs             %10d\n"
 	    "total frees               %10d\n"
@@ -1255,7 +1259,9 @@ Tcl_ValidateAllMemory(
 }
 
 int
-TclDumpMemoryInfo(ClientData clientData, int flags)
+TclDumpMemoryInfo(
+    ClientData clientData,
+    int flags)
 {
     return 1;
 }
diff --git a/generic/tclCmdAH.c b/generic/tclCmdAH.c
index 5ca5cf8..14951e4 100644
--- a/generic/tclCmdAH.c
+++ b/generic/tclCmdAH.c
@@ -32,6 +32,9 @@ struct ForeachState {
     int *argcList;		/* Array of value list sizes. */
     Tcl_Obj ***argvList;	/* Array of value lists. */
     Tcl_Obj **aCopyList;	/* Copies of value list arguments. */
+    Tcl_Obj *resultList;	/* List of result values from the loop body,
+				 * or NULL if we're not collecting them
+				 * ([lmap] vs [foreach]). */
 };
 
 /*
@@ -52,6 +55,8 @@ static int		GetStatBuf(Tcl_Interp *interp, Tcl_Obj *pathPtr,
 static const char *	GetTypeFromMode(int mode);
 static int		StoreStatData(Tcl_Interp *interp, Tcl_Obj *varName,
 			    Tcl_StatBuf *statPtr);
+static inline int	EachloopCmd(Tcl_Interp *interp, int collect,
+			    int objc, Tcl_Obj *const objv[]);
 static Tcl_NRPostProc	CatchObjCmdCallback;
 static Tcl_NRPostProc	ExprCallback;
 static Tcl_NRPostProc	ForSetupCallback;
@@ -2565,7 +2570,7 @@ ForPostNextCallback(
 /*
  *----------------------------------------------------------------------
  *
- * Tcl_ForeachObjCmd, TclNRForeachCmd --
+ * Tcl_ForeachObjCmd, TclNRForeachCmd, EachloopCmd --
  *
  *	This object-based procedure is invoked to process the "foreach" Tcl
  *	command. See the user documentation for details on what it does.
@@ -2597,6 +2602,38 @@ TclNRForeachCmd(
     int objc,
     Tcl_Obj *const objv[])
 {
+    return EachloopCmd(interp, TCL_EACH_KEEP_NONE, objc, objv);
+}
+
+int
+Tcl_LmapObjCmd(
+    ClientData dummy,		/* Not used. */
+    Tcl_Interp *interp,		/* Current interpreter. */
+    int objc,			/* Number of arguments. */
+    Tcl_Obj *const objv[])	/* Argument objects. */
+{
+    return Tcl_NRCallObjProc(interp, TclNRLmapCmd, dummy, objc, objv);
+}
+
+int
+TclNRLmapCmd(
+    ClientData dummy,
+    Tcl_Interp *interp,
+    int objc,
+    Tcl_Obj *const objv[])
+{
+    return EachloopCmd(interp, TCL_EACH_COLLECT, objc, objv);
+}
+
+static inline int
+EachloopCmd(
+    Tcl_Interp *interp,		/* Our context for variables and script
+				 * evaluation. */
+    int collect,		/* Select collecting or accumulating mode
+				 * (TCL_EACH_*) */
+    int objc,			/* The arguments being passed in... */
+    Tcl_Obj *const objv[])
+{
     int numLists = (objc-2) / 2;
     register struct ForeachState *statePtr;
     int i, j, result;
@@ -2640,6 +2677,12 @@ TclNRForeachCmd(
     statePtr->bodyPtr = objv[objc - 1];
     statePtr->bodyIdx = objc - 1;
 
+    if (collect == TCL_EACH_COLLECT) {
+	statePtr->resultList = Tcl_NewListObj(0, NULL);
+    } else {
+	statePtr->resultList = NULL;
+    }
+
     /*
      * Break up the value lists and variable lists into elements.
      */
@@ -2653,9 +2696,11 @@ TclNRForeachCmd(
 	TclListObjGetElements(NULL, statePtr->vCopyList[i],
 		&statePtr->varcList[i], &statePtr->varvList[i]);
 	if (statePtr->varcList[i] < 1) {
-	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
-		    "foreach varlist is empty", -1));
-	    Tcl_SetErrorCode(interp, "TCL", "OPERATION", "FOREACH",
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "%s varlist is empty",
+		    (statePtr->resultList != NULL ? "lmap" : "foreach")));
+	    Tcl_SetErrorCode(interp, "TCL", "OPERATION",
+		    (statePtr->resultList != NULL ? "LMAP" : "FOREACH"),
 		    "NEEDVARS", NULL);
 	    result = TCL_ERROR;
 	    goto done;
@@ -2725,14 +2770,21 @@ ForeachLoopStep(
     switch (result) {
     case TCL_CONTINUE:
 	result = TCL_OK;
+	break;
     case TCL_OK:
+	if (statePtr->resultList != NULL) {
+	    Tcl_ListObjAppendElement(interp, statePtr->resultList,
+		    Tcl_GetObjResult(interp));
+	}
 	break;
     case TCL_BREAK:
 	result = TCL_OK;
-	goto done;
+	goto finish;
     case TCL_ERROR:
 	Tcl_AppendObjToErrorInfo(interp, Tcl_ObjPrintf(
-		"\n    (\"foreach\" body line %d)", Tcl_GetErrorLine(interp)));
+		"\n    (\"%s\" body line %d)",
+		(statePtr->resultList != NULL ? "lmap" : "foreach"),
+		Tcl_GetErrorLine(interp)));
     default:
 	goto done;
     }
@@ -2757,7 +2809,14 @@ ForeachLoopStep(
      * We're done. Tidy up our work space and finish off.
      */
 
-    Tcl_ResetResult(interp);
+  finish:
+    if (statePtr->resultList == NULL) {
+	Tcl_ResetResult(interp);
+    } else {
+	Tcl_SetObjResult(interp, statePtr->resultList);
+	statePtr->resultList = NULL;	/* Don't clean it up */
+    }
+
   done:
     ForeachCleanup(interp, statePtr);
     return result;
@@ -2790,7 +2849,8 @@ ForeachAssignments(
 
 	    if (varValuePtr == NULL) {
 		Tcl_AppendObjToErrorInfo(interp, Tcl_ObjPrintf(
-			"\n    (setting foreach loop variable \"%s\")",
+			"\n    (setting %s loop variable \"%s\")",
+			(statePtr->resultList != NULL ? "lmap" : "foreach"),
 			TclGetString(statePtr->varvList[i][v])));
 		return TCL_ERROR;
 	    }
@@ -2819,6 +2879,9 @@ ForeachCleanup(
 	    TclDecrRefCount(statePtr->aCopyList[i]);
 	}
     }
+    if (statePtr->resultList != NULL) {
+	TclDecrRefCount(statePtr->resultList);
+    }
     TclStackFree(interp, statePtr);
 }
 
diff --git a/generic/tclCompCmds.c b/generic/tclCompCmds.c
index 1ec6bd0..64417c5 100644
--- a/generic/tclCompCmds.c
+++ b/generic/tclCompCmds.c
@@ -40,6 +40,13 @@ static int		PushVarName(Tcl_Interp *interp,
 			    int flags, int *localIndexPtr,
 			    int *simpleVarNamePtr, int *isScalarPtr,
 			    int line, int *clNext);
+static int		CompileEachloopCmd(Tcl_Interp *interp,
+			    Tcl_Parse *parsePtr, Command *cmdPtr,
+			    CompileEnv *envPtr, int collect);
+static int		CompileDictEachCmd(Tcl_Interp *interp,
+			    Tcl_Parse *parsePtr, Command *cmdPtr,
+			    struct CompileEnv *envPtr, int collect);
+
 
 /*
  * Macro that encapsulates an efficiency trick that avoids a function call for
@@ -586,6 +593,7 @@ TclCompileContinueCmd(
  *		dict incr
  *		dict keys	[*]
  *		dict lappend
+ *		dict map
  *		dict set
  *		dict unset
  *
@@ -787,11 +795,42 @@ TclCompileDictForCmd(
 				 * compiled. */
     CompileEnv *envPtr)		/* Holds resulting instructions. */
 {
+    return CompileDictEachCmd(interp, parsePtr, cmdPtr, envPtr,
+	    TCL_EACH_KEEP_NONE);
+}
+
+int
+TclCompileDictMapCmd(
+    Tcl_Interp *interp,		/* Used for looking up stuff. */
+    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
+				 * created by Tcl_ParseCommand. */
+    Command *cmdPtr,		/* Points to defintion of command being
+				 * compiled. */
+    CompileEnv *envPtr)		/* Holds resulting instructions. */
+{
+    return CompileDictEachCmd(interp, parsePtr, cmdPtr, envPtr,
+	    TCL_EACH_COLLECT);
+}
+
+int
+CompileDictEachCmd(
+    Tcl_Interp *interp,		/* Used for looking up stuff. */
+    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
+				 * created by Tcl_ParseCommand. */
+    Command *cmdPtr,		/* Points to defintion of command being
+				 * compiled. */
+    CompileEnv *envPtr,		/* Holds resulting instructions. */
+    int collect)		/* Flag == TCL_EACH_COLLECT to collect and
+				 * construct a new dictionary with the loop
+				 * body result. */
+{
     DefineLineInformation;	/* TIP #280 */
     Tcl_Token *varsTokenPtr, *dictTokenPtr, *bodyTokenPtr;
     int keyVarIndex, valueVarIndex, nameChars, loopRange, catchRange;
     int infoIndex, jumpDisplacement, bodyTargetOffset, emptyTargetOffset;
     int numVars, endTargetOffset;
+    int collectVar = -1;	/* Index of temp var holding the result
+				 * dict. */
     int savedStackDepth = envPtr->currStackDepth;
 				/* Needed because jumps confuse the stack
 				 * space calculator. */
@@ -815,6 +854,19 @@ TclCompileDictForCmd(
     }
 
     /*
+     * Create temporary variable to capture return values from loop body when
+     * we're collecting results.
+     */
+
+    if (collect == TCL_EACH_COLLECT) {
+	collectVar = TclFindCompiledLocal(NULL, /*nameChars*/ 0, /*create*/ 1,
+		envPtr);
+	if (collectVar < 0) {
+	    return TCL_ERROR;
+	}
+    }
+
+    /*
      * Check we've got a pair of variables and that they are local variables.
      * Then extract their indices in the LVT.
      */
@@ -867,8 +919,18 @@ TclCompileDictForCmd(
      * Preparation complete; issue instructions. Note that this code issues
      * fixed-sized jumps. That simplifies things a lot!
      *
-     * First up, get the dictionary and start the iteration. No catching of
-     * errors at this point.
+     * First up, initialize the accumulator dictionary if needed.
+     */
+
+    if (collect == TCL_EACH_COLLECT) {
+	PushLiteral(envPtr, "", 0);
+	Emit14Inst(	INST_STORE_SCALAR, collectVar,		envPtr);
+	TclEmitOpcode(	INST_POP,				envPtr);
+    }
+
+    /*
+     * Get the dictionary and start the iteration. No catching of errors at
+     * this point.
      */
 
     CompileWord(envPtr, dictTokenPtr, interp, 3);
@@ -908,6 +970,13 @@ TclCompileDictForCmd(
 
     SetLineInformation(3);
     CompileBody(envPtr, bodyTokenPtr, interp);
+    if (collect == TCL_EACH_COLLECT) {
+	Emit14Inst(	INST_LOAD_SCALAR, keyVarIndex,		envPtr);
+	TclEmitInstInt4(INST_OVER, 1,				envPtr);
+	TclEmitInstInt4(INST_DICT_SET, 1,			envPtr);
+	TclEmitInt4(		collectVar,			envPtr);
+	TclEmitOpcode(	INST_POP,				envPtr);
+    }
     TclEmitOpcode(	INST_POP,				envPtr);
 
     /*
@@ -956,6 +1025,10 @@ TclCompileDictForCmd(
     TclEmitInstInt1(	INST_UNSET_SCALAR, 0,			envPtr);
     TclEmitInt4(	infoIndex,				envPtr);
     TclEmitOpcode(	INST_END_CATCH,				envPtr);
+    if (collect == TCL_EACH_COLLECT) {
+	TclEmitInstInt1(INST_UNSET_SCALAR, 0,			envPtr);
+	TclEmitInt4(		collectVar,			envPtr);
+    }
     TclEmitOpcode(	INST_RETURN_STK,			envPtr);
 
     /*
@@ -971,18 +1044,24 @@ TclCompileDictForCmd(
     TclEmitOpcode(	INST_POP,				envPtr);
     TclEmitOpcode(	INST_POP,				envPtr);
     TclEmitInstInt1(	INST_UNSET_SCALAR, 0,			envPtr);
-    TclEmitInt4(	infoIndex,				envPtr);
+    TclEmitInt4(		infoIndex,			envPtr);
 
     /*
      * Final stage of the command (normal case) is that we push an empty
-     * object. This is done last to promote peephole optimization when it's
-     * dropped immediately.
+     * object (or push the accumulator as the result object). This is done
+     * last to promote peephole optimization when it's dropped immediately.
      */
 
     jumpDisplacement = CurrentOffset(envPtr) - endTargetOffset;
     TclUpdateInstInt4AtPc(INST_JUMP4, jumpDisplacement,
 	    envPtr->codeStart + endTargetOffset);
-    PushLiteral(envPtr, "", 0);
+    if (collect == TCL_EACH_COLLECT) {
+	Emit14Inst(	INST_LOAD_SCALAR, collectVar,		envPtr);
+	TclEmitInstInt1(INST_UNSET_SCALAR, 0,			envPtr);
+	TclEmitInt4(		collectVar,			envPtr);
+    } else {
+	PushLiteral(envPtr, "", 0);
+    }
     return TCL_OK;
 }
 
@@ -1870,6 +1949,39 @@ TclCompileForeachCmd(
 				 * compiled. */
     CompileEnv *envPtr)		/* Holds resulting instructions. */
 {
+    return CompileEachloopCmd(interp, parsePtr, cmdPtr, envPtr,
+	    TCL_EACH_KEEP_NONE);
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * CompileEachloopCmd --
+ *
+ *	Procedure called to compile the "foreach" and "lmap" commands.
+ *
+ * Results:
+ *	Returns TCL_OK for a successful compile. Returns TCL_ERROR to defer
+ *	evaluation to runtime.
+ *
+ * Side effects:
+ *	Instructions are added to envPtr to execute the "foreach" command at
+ *	runtime.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static int
+CompileEachloopCmd(
+    Tcl_Interp *interp,		/* Used for error reporting. */
+    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
+				 * created by Tcl_ParseCommand. */
+    Command *cmdPtr,		/* Points to defintion of command being
+				 * compiled. */
+    CompileEnv *envPtr,		/* Holds resulting instructions. */
+    int collect)		/* Select collecting or accumulating mode
+				 * (TCL_EACH_*) */
+{
     Proc *procPtr = envPtr->procPtr;
     ForeachInfo *infoPtr;	/* Points to the structure describing this
 				 * foreach command. Stored in a AuxData
@@ -1878,6 +1990,9 @@ TclCompileForeachCmd(
 				 * used to point to a value list. */
     int loopCtTemp;		/* Index of temp var holding the loop's
 				 * iteration count. */
+    int collectVar = -1;	/* Index of temp var holding the result var
+				 * index. */
+
     Tcl_Token *tokenPtr, *bodyTokenPtr;
     unsigned char *jumpPc;
     JumpFixup jumpFalseFixup;
@@ -1993,6 +2108,14 @@ TclCompileForeachCmd(
 	loopIndex++;
     }
 
+    if (collect == TCL_EACH_COLLECT) {
+	collectVar = TclFindCompiledLocal(NULL, /*nameChars*/ 0, /*create*/ 1,
+		envPtr);
+	if (collectVar < 0) {
+	    return TCL_ERROR;
+	}
+    }
+	    
     /*
      * We will compile the foreach command. Reserve (numLists + 1) temporary
      * variables:
@@ -2069,6 +2192,16 @@ TclCompileForeachCmd(
     }
 
     /*
+     * Create temporary variable to capture return values from loop body.
+     */
+     
+    if (collect == TCL_EACH_COLLECT) {
+	PushLiteral(envPtr, "", 0);
+	Emit14Inst(		INST_STORE_SCALAR, collectVar,	envPtr);
+	TclEmitOpcode(		INST_POP,			envPtr);
+    }
+
+    /*
      * Initialize the temporary var that holds the count of loop iterations.
      */
 
@@ -2092,6 +2225,10 @@ TclCompileForeachCmd(
     CompileBody(envPtr, bodyTokenPtr, interp);
     ExceptionRangeEnds(envPtr, range);
     envPtr->currStackDepth = savedStackDepth + 1;
+
+    if (collect == TCL_EACH_COLLECT) {
+	Emit14Inst(		INST_LAPPEND_SCALAR, collectVar,envPtr);
+    }
     TclEmitOpcode(		INST_POP,			envPtr);
 
     /*
@@ -2142,11 +2279,18 @@ TclCompileForeachCmd(
     ExceptionRangeTarget(envPtr, range, breakOffset);
 
     /*
-     * The foreach command's result is an empty string.
+     * The command's result is an empty string if not collecting, or the
+     * list of results from evaluating the loop body.
      */
 
     envPtr->currStackDepth = savedStackDepth;
-    PushLiteral(envPtr, "", 0);
+    if (collect == TCL_EACH_COLLECT) {
+	Emit14Inst(		INST_LOAD_SCALAR, collectVar,	envPtr);
+	TclEmitInstInt1(INST_UNSET_SCALAR, 0,			envPtr);
+	TclEmitInt4(		collectVar,			envPtr);
+    } else {
+	PushLiteral(envPtr, "", 0);
+    }
     envPtr->currStackDepth = savedStackDepth + 1;
 
   done:
@@ -3761,6 +3905,37 @@ TclCompileLsetCmd(
 /*
  *----------------------------------------------------------------------
  *
+ * TclCompileLmapCmd --
+ *
+ *	Procedure called to compile the "lmap" command.
+ *
+ * Results:
+ *	Returns TCL_OK for a successful compile. Returns TCL_ERROR to defer
+ *	evaluation to runtime.
+ *
+ * Side effects:
+ *	Instructions are added to envPtr to execute the "lmap" command at
+ *	runtime.
+ *
+ *----------------------------------------------------------------------
+ */
+
+int
+TclCompileLmapCmd(
+    Tcl_Interp *interp,		/* Used for error reporting. */
+    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
+				 * created by Tcl_ParseCommand. */
+    Command *cmdPtr,		/* Points to defintion of command being
+				 * compiled. */
+    CompileEnv *envPtr)		/* Holds resulting instructions. */
+{
+    return CompileEachloopCmd(interp, parsePtr, cmdPtr, envPtr,
+	    TCL_EACH_COLLECT);
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
  * TclCompileNamespace*Cmd --
  *
  *	Procedures called to compile the "namespace" command; currently, only
diff --git a/generic/tclDecls.h b/generic/tclDecls.h
index 1e2a68b..3ae8b33 100644
--- a/generic/tclDecls.h
+++ b/generic/tclDecls.h
@@ -1807,6 +1807,10 @@ EXTERN void *		Tcl_FindSymbol(Tcl_Interp *interp,
 /* 629 */
 EXTERN int		Tcl_FSUnloadFile(Tcl_Interp *interp,
 				Tcl_LoadHandle handlePtr);
+/* 630 */
+EXTERN void		Tcl_ZlibStreamSetCompressionDictionary(
+				Tcl_ZlibStream zhandle,
+				Tcl_Obj *compressionDictionaryObj);
 
 typedef struct TclStubHooks {
     const struct TclPlatStubs *tclPlatStubs;
@@ -2472,6 +2476,7 @@ typedef struct TclStubs {
     int (*tcl_LoadFile) (Tcl_Interp *interp, Tcl_Obj *pathPtr, const char *const symv[], int flags, void *procPtrs, Tcl_LoadHandle *handlePtr); /* 627 */
     void * (*tcl_FindSymbol) (Tcl_Interp *interp, Tcl_LoadHandle handle, const char *symbol); /* 628 */
     int (*tcl_FSUnloadFile) (Tcl_Interp *interp, Tcl_LoadHandle handlePtr); /* 629 */
+    void (*tcl_ZlibStreamSetCompressionDictionary) (Tcl_ZlibStream zhandle, Tcl_Obj *compressionDictionaryObj); /* 630 */
 } TclStubs;
 
 #ifdef __cplusplus
@@ -3764,6 +3769,8 @@ extern const TclStubs *tclStubsPtr;
 	(tclStubsPtr->tcl_FindSymbol) /* 628 */
 #define Tcl_FSUnloadFile \
 	(tclStubsPtr->tcl_FSUnloadFile) /* 629 */
+#define Tcl_ZlibStreamSetCompressionDictionary \
+	(tclStubsPtr->tcl_ZlibStreamSetCompressionDictionary) /* 630 */
 
 #endif /* defined(USE_TCL_STUBS) */
 
diff --git a/generic/tclDictObj.c b/generic/tclDictObj.c
index 691fab9..d1087b2 100644
--- a/generic/tclDictObj.c
+++ b/generic/tclDictObj.c
@@ -76,9 +76,12 @@ static int		FinalizeDictWith(ClientData data[],
 			    Tcl_Interp *interp, int result);
 static int		DictForNRCmd(ClientData dummy, Tcl_Interp *interp,
 			    int objc, Tcl_Obj *const *objv);
+static int		DictMapNRCmd(ClientData dummy, Tcl_Interp *interp,
+			    int objc, Tcl_Obj *const *objv);
 static int		DictForLoopCallback(ClientData data[],
 			    Tcl_Interp *interp, int result);
-
+static int		DictMapLoopCallback(ClientData data[],
+			    Tcl_Interp *interp, int result);
 
 /*
  * Table of dict subcommand names and implementations.
@@ -95,6 +98,7 @@ static const EnsembleImplMap implementationMap[] = {
     {"info",	DictInfoCmd, NULL, NULL, NULL, 0 },
     {"keys",	DictKeysCmd, NULL, NULL, NULL, 0 },
     {"lappend",	DictLappendCmd,	TclCompileDictLappendCmd, NULL, NULL, 0 },
+    {"map", 	NULL,       	TclCompileDictMapCmd, DictMapNRCmd, NULL, 0 },
     {"merge",	DictMergeCmd, NULL, NULL, NULL, 0 },
     {"remove",	DictRemoveCmd, NULL, NULL, NULL, 0 },
     {"replace",	DictReplaceCmd, NULL, NULL, NULL, 0 },
@@ -181,6 +185,23 @@ static const Tcl_HashKeyType chainHashType = {
     AllocChainEntry,
     TclFreeObjEntry
 };
+
+/*
+ * Structure used in implementation of 'dict map' to hold the state that gets
+ * passed between parts of the implementation.
+ */
+
+typedef struct {
+    Tcl_Obj *keyVarObj;		/* The name of the variable that will have
+				 * keys assigned to it. */
+    Tcl_Obj *valueVarObj;	/* The name of the variable that will have
+				 * values assigned to it. */
+    Tcl_DictSearch search;	/* The dictionary search structure. */
+    Tcl_Obj *scriptObj;		/* The script to evaluate each time through
+				 * the loop. */
+    Tcl_Obj *accumulatorObj;	/* The dictionary used to accumulate the
+				 * results. */
+} DictMapStorage;
 
 /***** START OF FUNCTIONS IMPLEMENTING DICT CORE API *****/
 
@@ -954,6 +975,7 @@ Tcl_DictObjGet(
     if (dictPtr->typePtr != &tclDictType) {
 	int result = SetDictFromAny(interp, dictPtr);
 	if (result != TCL_OK) {
+	    *valuePtrPtr = NULL;
 	    return result;
 	}
     }
@@ -2335,7 +2357,7 @@ DictAppendCmd(
  *
  * DictForNRCmd --
  *
- *	This function implements the "dict for" Tcl command. See the user
+ *	These functions implement the "dict for" Tcl command.  See the user
  *	documentation for details on what it does, and TIP#111 for the formal
  *	specification.
  *
@@ -2488,13 +2510,15 @@ DictForLoopCallback(
      */
 
     Tcl_IncrRefCount(valueObj);
-    if (Tcl_ObjSetVar2(interp, keyVarObj, NULL, keyObj, TCL_LEAVE_ERR_MSG) == NULL) {
+    if (Tcl_ObjSetVar2(interp, keyVarObj, NULL, keyObj,
+	    TCL_LEAVE_ERR_MSG) == NULL) {
 	TclDecrRefCount(valueObj);
 	result = TCL_ERROR;
 	goto done;
     }
     TclDecrRefCount(valueObj);
-    if (Tcl_ObjSetVar2(interp, valueVarObj, NULL, valueObj, TCL_LEAVE_ERR_MSG) == NULL) {
+    if (Tcl_ObjSetVar2(interp, valueVarObj, NULL, valueObj,
+	    TCL_LEAVE_ERR_MSG) == NULL) {
 	result = TCL_ERROR;
 	goto done;
     }
@@ -2523,6 +2547,217 @@ DictForLoopCallback(
 /*
  *----------------------------------------------------------------------
  *
+ * DictMapNRCmd --
+ *
+ *	These functions implement the "dict map" Tcl command.  See the user
+ *	documentation for details on what it does, and TIP#405 for the formal
+ *	specification.
+ *
+ * Results:
+ *	A standard Tcl result.
+ *
+ * Side effects:
+ *	See the user documentation.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static int
+DictMapNRCmd(
+    ClientData dummy,
+    Tcl_Interp *interp,
+    int objc,
+    Tcl_Obj *const *objv)
+{
+    Interp *iPtr = (Interp *) interp;
+    Tcl_Obj **varv, *keyObj, *valueObj;
+    DictMapStorage *storagePtr;
+    int varc, done;
+
+    if (objc != 4) {
+	Tcl_WrongNumArgs(interp, 1, objv,
+		"{keyVar valueVar} dictionary script");
+	return TCL_ERROR;
+    }
+
+    /*
+     * Parse arguments.
+     */
+
+    if (TclListObjGetElements(interp, objv[1], &varc, &varv) != TCL_OK) {
+	return TCL_ERROR;
+    }
+    if (varc != 2) {
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"must have exactly two variable names", -1));
+	return TCL_ERROR;
+    }
+    storagePtr = TclStackAlloc(interp, sizeof(DictMapStorage));
+    if (Tcl_DictObjFirst(interp, objv[2], &storagePtr->search, &keyObj,
+	    &valueObj, &done) != TCL_OK) {
+	TclStackFree(interp, storagePtr);
+	return TCL_ERROR;
+    }
+    if (done) {
+	/*
+	 * Note that this exit leaves an empty value in the result (due to
+	 * command calling conventions) but that is OK since an empty value is
+	 * an empty dictionary.
+	 */
+
+	TclStackFree(interp, storagePtr);
+	return TCL_OK;
+    }
+    TclNewObj(storagePtr->accumulatorObj);
+    TclListObjGetElements(NULL, objv[1], &varc, &varv);
+    storagePtr->keyVarObj = varv[0];
+    storagePtr->valueVarObj = varv[1];
+    storagePtr->scriptObj = objv[3];
+
+    /*
+     * Make sure that these objects (which we need throughout the body of the
+     * loop) don't vanish. Note that the dictionary internal rep is locked
+     * internally so that updates, shimmering, etc are not a problem.
+     */
+
+    Tcl_IncrRefCount(storagePtr->accumulatorObj);
+    Tcl_IncrRefCount(storagePtr->keyVarObj);
+    Tcl_IncrRefCount(storagePtr->valueVarObj);
+    Tcl_IncrRefCount(storagePtr->scriptObj);
+
+    /*
+     * Stop the value from getting hit in any way by any traces on the key
+     * variable.
+     */
+
+    Tcl_IncrRefCount(valueObj);
+    if (Tcl_ObjSetVar2(interp, storagePtr->keyVarObj, NULL, keyObj,
+	    TCL_LEAVE_ERR_MSG) == NULL) {
+	TclDecrRefCount(valueObj);
+	goto error;
+    }
+    if (Tcl_ObjSetVar2(interp, storagePtr->valueVarObj, NULL, valueObj,
+	    TCL_LEAVE_ERR_MSG) == NULL) {
+	TclDecrRefCount(valueObj);
+	goto error;
+    }
+    TclDecrRefCount(valueObj);
+
+    /*
+     * Run the script.
+     */
+
+    TclNRAddCallback(interp, DictMapLoopCallback, storagePtr, NULL,NULL,NULL);
+    return TclNREvalObjEx(interp, storagePtr->scriptObj, 0,
+	    iPtr->cmdFramePtr, 3);
+
+    /*
+     * For unwinding everything on error.
+     */
+
+  error:
+    TclDecrRefCount(storagePtr->keyVarObj);
+    TclDecrRefCount(storagePtr->valueVarObj);
+    TclDecrRefCount(storagePtr->scriptObj);
+    TclDecrRefCount(storagePtr->accumulatorObj);
+    Tcl_DictObjDone(&storagePtr->search);
+    TclStackFree(interp, storagePtr);
+    return TCL_ERROR;
+}
+
+static int
+DictMapLoopCallback(
+    ClientData data[],
+    Tcl_Interp *interp,
+    int result)
+{
+    Interp *iPtr = (Interp *) interp;
+    DictMapStorage *storagePtr = data[0];
+    Tcl_Obj *keyObj, *valueObj;
+    int done;
+
+    /*
+     * Process the result from the previous execution of the script body.
+     */
+
+    if (result == TCL_CONTINUE) {
+	result = TCL_OK;
+    } else if (result != TCL_OK) {
+	if (result == TCL_BREAK) {
+	    Tcl_ResetResult(interp);
+	    result = TCL_OK;
+	} else if (result == TCL_ERROR) {
+	    Tcl_AppendObjToErrorInfo(interp, Tcl_ObjPrintf(
+		    "\n    (\"dict map\" body line %d)",
+		    Tcl_GetErrorLine(interp)));
+	}
+	goto done;
+    } else {
+	keyObj = Tcl_ObjGetVar2(interp, storagePtr->keyVarObj, NULL,
+		TCL_LEAVE_ERR_MSG);
+	if (keyObj == NULL) {
+	    result = TCL_ERROR;
+	    goto done;
+	}
+	Tcl_DictObjPut(NULL, storagePtr->accumulatorObj, keyObj,
+		Tcl_GetObjResult(interp));
+    }
+
+    /*
+     * Get the next mapping from the dictionary.
+     */
+
+    Tcl_DictObjNext(&storagePtr->search, &keyObj, &valueObj, &done);
+    if (done) {
+	Tcl_SetObjResult(interp, storagePtr->accumulatorObj);
+	goto done;
+    }
+
+    /*
+     * Stop the value from getting hit in any way by any traces on the key
+     * variable.
+     */
+
+    Tcl_IncrRefCount(valueObj);
+    if (Tcl_ObjSetVar2(interp, storagePtr->keyVarObj, NULL, keyObj,
+	    TCL_LEAVE_ERR_MSG) == NULL) {
+	TclDecrRefCount(valueObj);
+	result = TCL_ERROR;
+	goto done;
+    }
+    if (Tcl_ObjSetVar2(interp, storagePtr->valueVarObj, NULL, valueObj,
+	    TCL_LEAVE_ERR_MSG) == NULL) {
+	TclDecrRefCount(valueObj);
+	result = TCL_ERROR;
+	goto done;
+    }
+    TclDecrRefCount(valueObj);
+
+    /*
+     * Run the script.
+     */
+
+    TclNRAddCallback(interp, DictMapLoopCallback, storagePtr, NULL,NULL,NULL);
+    return TclNREvalObjEx(interp, storagePtr->scriptObj, 0,
+	    iPtr->cmdFramePtr, 3);
+
+    /*
+     * For unwinding everything once the iterating is done.
+     */
+
+  done:
+    TclDecrRefCount(storagePtr->keyVarObj);
+    TclDecrRefCount(storagePtr->valueVarObj);
+    TclDecrRefCount(storagePtr->scriptObj);
+    TclDecrRefCount(storagePtr->accumulatorObj);
+    Tcl_DictObjDone(&storagePtr->search);
+    TclStackFree(interp, storagePtr);
+    return result;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
  * DictSetCmd --
  *
  *	This function implements the "dict set" Tcl command. See the user
@@ -3445,7 +3680,7 @@ TclInitDictCmd(
 {
     return TclMakeEnsemble(interp, "dict", implementationMap);
 }
-
+
 /*
  * Local Variables:
  * mode: c
diff --git a/generic/tclFCmd.c b/generic/tclFCmd.c
index 032dda7..33c1496 100644
--- a/generic/tclFCmd.c
+++ b/generic/tclFCmd.c
@@ -10,11 +10,6 @@
  * this file, and for a DISCLAIMER OF ALL WARRANTIES.
  */
 
-#ifndef _WIN64
-/* See [Bug 2935503]: file mtime sets wrong time */
-#   define _USE_32BIT_TIME_T
-#endif
-
 #include "tclInt.h"
 #include "tclFileSystem.h"
 
diff --git a/generic/tclFileName.c b/generic/tclFileName.c
index 5d90351..5d4702b 100644
--- a/generic/tclFileName.c
+++ b/generic/tclFileName.c
@@ -411,25 +411,28 @@ TclpGetNativePathType(
 	     * Paths that begin with / are absolute.
 	     */
 
-#ifdef __QNX__
-	    /*
-	     * Check for QNX //<node id> prefix
-	     */
-	    if (*path && (pathLen > 3) && (path[0] == '/')
-		    && (path[1] == '/') && isdigit(UCHAR(path[2]))) {
-		path += 3;
-		while (isdigit(UCHAR(*path))) {
-		    path++;
-		}
-	    }
-#endif
 	    if (path[0] == '/') {
-#ifdef __CYGWIN__
+		++path;
+#if defined(__CYGWIN__) || defined(__QNX__)
 		/*
-		 * Check for Cygwin // network path prefix
+		 * Check for "//" network path prefix
 		 */
-		if (path[1] == '/') {
-		    path++;
+		if ((*path == '/') && path[1] && (path[1] != '/')) {
+		    path += 2;
+		    while (*path && *path != '/') {
+			++path;
+		    }
+#if defined(__CYGWIN__)
+		    /* UNC paths need to be followed by a share name */
+		    if (*path++ && (*path && *path != '/')) {
+			++path;
+			while (*path && *path != '/') {
+			    ++path;
+			}
+		    } else {
+			path = origPath + 1;
+		    }
+#endif
 		}
 #endif
 		if (driveNameLengthPtr != NULL) {
@@ -437,7 +440,7 @@ TclpGetNativePathType(
 		     * We need this addition in case the QNX or Cygwin code was used.
 		     */
 
-		    *driveNameLengthPtr = (1 + path - origPath);
+		    *driveNameLengthPtr = (path - origPath);
 		}
 	    } else {
 		type = TCL_PATH_RELATIVE;
@@ -640,41 +643,43 @@ SplitUnixPath(
     const char *path)		/* Pointer to string containing a path. */
 {
     int length;
-    const char *p, *elementStart;
+    const char *origPath = path, *elementStart;
     Tcl_Obj *result = Tcl_NewObj();
 
     /*
      * Deal with the root directory as a special case.
      */
 
-#ifdef __QNX__
-    /*
-     * Check for QNX //<node id> prefix
-     */
-
-    if ((path[0] == '/') && (path[1] == '/')
-	    && isdigit(UCHAR(path[2]))) { /* INTL: digit */
-	path += 3;
-	while (isdigit(UCHAR(*path))) { /* INTL: digit */
-	    path++;
-	}
-    }
-#endif
-
-    p = path;
-    if (*p == '/') {
-	Tcl_Obj *rootElt = Tcl_NewStringObj("/", 1);
-	p++;
-#ifdef __CYGWIN__
+    if (*path == '/') {
+	Tcl_Obj *rootElt;
+	++path;
+#if defined(__CYGWIN__) || defined(__QNX__)
 	/*
-	 * Check for Cygwin // network path prefix
+	 * Check for "//" network path prefix
 	 */
-	if (*p == '/') {
-	    Tcl_AppendToObj(rootElt, "/", 1);
-	    p++;
+	if ((*path == '/') && path[1] && (path[1] != '/')) {
+	    path += 2;
+	    while (*path && *path != '/') {
+		++path;
+	    }
+#if defined(__CYGWIN__)
+	    /* UNC paths need to be followed by a share name */
+	    if (*path++ && (*path && *path != '/')) {
+		++path;
+		while (*path && *path != '/') {
+		    ++path;
+		}
+	    } else {
+		path = origPath + 1;
+	    }
+#endif
 	}
 #endif
+	rootElt = Tcl_NewStringObj(origPath, path - origPath);
 	Tcl_ListObjAppendElement(NULL, result, rootElt);
+	while (*path == '/') {
+	    ++path;
+	}
     }
 
     /*
@@ -683,14 +688,14 @@ SplitUnixPath(
      */
 
     for (;;) {
-	elementStart = p;
-	while ((*p != '\0') && (*p != '/')) {
-	    p++;
+	elementStart = path;
+	while ((*path != '\0') && (*path != '/')) {
+	    path++;
 	}
-	length = p - elementStart;
+	length = path - elementStart;
 	if (length > 0) {
 	    Tcl_Obj *nextElt;
-	    if ((elementStart[0] == '~') && (elementStart != path)) {
+	    if ((elementStart[0] == '~') && (elementStart != origPath)) {
 		TclNewLiteralStringObj(nextElt, "./");
 		Tcl_AppendToObj(nextElt, elementStart, length);
 	    } else {
@@ -698,7 +703,7 @@ SplitUnixPath(
 	    }
 	    Tcl_ListObjAppendElement(NULL, result, nextElt);
 	}
-	if (*p++ == '\0') {
+	if (*path++ == '\0') {
 	    break;
 	}
     }
@@ -1774,6 +1779,7 @@ TclGlob(
 	    if (c != '\0') {
 		tail++;
 	    }
+	    Tcl_DStringFree(&buffer);
 	} else {
 	    tail = pattern;
 	}
diff --git a/generic/tclIO.c b/generic/tclIO.c
index 2de8b53..0cb9fa9 100644
--- a/generic/tclIO.c
+++ b/generic/tclIO.c
@@ -879,19 +879,25 @@ CheckForStdChannelsBeingClosed(
     ChannelState *statePtr = ((Channel *) chan)->state;
     ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
 
-    if ((chan == tsdPtr->stdinChannel) && tsdPtr->stdinInitialized) {
+    if (tsdPtr->stdinInitialized
+	    && tsdPtr->stdinChannel != NULL
+	    && statePtr == ((Channel *)tsdPtr->stdinChannel)->state) {
 	if (statePtr->refCount < 2) {
 	    statePtr->refCount = 0;
 	    tsdPtr->stdinChannel = NULL;
 	    return;
 	}
-    } else if ((chan == tsdPtr->stdoutChannel) && tsdPtr->stdoutInitialized) {
+    } else if (tsdPtr->stdoutInitialized
+	    && tsdPtr->stdoutChannel != NULL
+	    && statePtr == ((Channel *)tsdPtr->stdoutChannel)->state) {
 	if (statePtr->refCount < 2) {
 	    statePtr->refCount = 0;
 	    tsdPtr->stdoutChannel = NULL;
 	    return;
 	}
-    } else if ((chan == tsdPtr->stderrChannel) && tsdPtr->stderrInitialized) {
+    } else if (tsdPtr->stderrInitialized
+	    && tsdPtr->stderrChannel != NULL
+	    && statePtr == ((Channel *)tsdPtr->stderrChannel)->state) {
 	if (statePtr->refCount < 2) {
 	    statePtr->refCount = 0;
 	    tsdPtr->stderrChannel = NULL;
@@ -1027,8 +1033,9 @@ Tcl_UnregisterChannel(
 
     if (GotFlag(statePtr, CHANNEL_INCLOSE)) {
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "Illegal recursive call to close "
-		    "through close-handler of channel", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+                    "illegal recursive call to close through close-handler"
+                    " of channel", -1));
 	}
 	return TCL_ERROR;
     }
@@ -1263,8 +1270,8 @@ Tcl_GetChannel(
     hTblPtr = GetChannelTable(interp);
     hPtr = Tcl_FindHashEntry(hTblPtr, name);
     if (hPtr == NULL) {
-	Tcl_AppendResult(interp, "can not find channel named \"", chanName,
-		"\"", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+                "can not find channel named \"%s\"", chanName));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "CHANNEL", chanName, NULL);
 	return NULL;
     }
@@ -1584,8 +1591,9 @@ Tcl_StackChannel(
 
     if (statePtr == NULL) {
 	if (interp) {
-	    Tcl_AppendResult(interp, "couldn't find state for channel \"",
-		    Tcl_GetChannelName(prevChan), "\"", NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+                    "couldn't find state for channel \"%s\"",
+		    Tcl_GetChannelName(prevChan)));
 	}
 	return NULL;
     }
@@ -1605,9 +1613,9 @@ Tcl_StackChannel(
 
     if ((mask & (statePtr->flags & (TCL_READABLE | TCL_WRITABLE))) == 0) {
 	if (interp) {
-	    Tcl_AppendResult(interp,
-		    "reading and writing both disallowed for channel \"",
-		    Tcl_GetChannelName(prevChan), "\"", NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "reading and writing both disallowed for channel \"%s\"",
+		    Tcl_GetChannelName(prevChan)));
 	}
 	return NULL;
     }
@@ -1630,8 +1638,9 @@ Tcl_StackChannel(
 	    statePtr->csPtrR = csPtrR;
 	    statePtr->csPtrW = csPtrW;
 	    if (interp) {
-		Tcl_AppendResult(interp, "could not flush channel \"",
-			Tcl_GetChannelName(prevChan), "\"", NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+                        "could not flush channel \"%s\"",
+			Tcl_GetChannelName(prevChan)));
 	    }
 	    return NULL;
 	}
@@ -1784,9 +1793,9 @@ Tcl_UnstackChannel(
 		 */
 
 		if (!TclChanCaughtErrorBypass(interp, chan) && interp) {
-		    Tcl_AppendResult(interp, "could not flush channel \"",
-			    Tcl_GetChannelName((Tcl_Channel) chanPtr), "\"",
-			    NULL);
+		    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+                            "could not flush channel \"%s\"",
+			    Tcl_GetChannelName((Tcl_Channel) chanPtr)));
 		}
 		return TCL_ERROR;
 	    }
@@ -2318,8 +2327,8 @@ CheckForDeadChannel(
 
     Tcl_SetErrno(EINVAL);
     if (interp) {
-	Tcl_AppendResult(interp, "unable to access channel: invalid channel",
-		NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+                "unable to access channel: invalid channel", -1));
     }
     return 1;
 }
@@ -3051,8 +3060,9 @@ Tcl_Close(
 
     if (GotFlag(statePtr, CHANNEL_INCLOSE)) {
 	if (interp) {
-	    Tcl_AppendResult(interp, "Illegal recursive call to close "
-		    "through close-handler of channel", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+                    "illegal recursive call to close through close-handler"
+                    " of channel", -1));
 	}
 	return TCL_ERROR;
     }
@@ -3210,8 +3220,9 @@ Tcl_CloseEx(
      */
 
     if (!chanPtr->typePtr->close2Proc) {
-	Tcl_AppendResult(interp, "Half-close of channels not supported by ",
-		chanPtr->typePtr->typeName, "s", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+                "half-close of channels not supported by %ss",
+		chanPtr->typePtr->typeName));
 	return TCL_ERROR;
     }
 
@@ -3220,9 +3231,8 @@ Tcl_CloseEx(
      */
 
     if (chanPtr != statePtr->topChanPtr) {
-	Tcl_AppendResult(interp,
-		"Half-close not applicable to stack of transformations",
-		NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"half-close not applicable to stack of transformations", -1));
 	return TCL_ERROR;
     }
 
@@ -3240,9 +3250,9 @@ Tcl_CloseEx(
 	} else {
 	    msg = "write";
 	}
-	Tcl_AppendResult(interp, "Half-close of ", msg,
-		"-side not possible, side not opened or already closed",
-		NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+                "Half-close of %s-side not possible, side not opened or"
+                " already closed", msg));
 	return TCL_ERROR;
     }
 
@@ -3253,8 +3263,9 @@ Tcl_CloseEx(
 
     if (statePtr->flags & CHANNEL_INCLOSE) {
 	if (interp) {
-	    Tcl_AppendResult(interp, "Illegal recursive call to close "
-		    "through close-handler of channel", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+                    "illegal recursive call to close through close-handler"
+                    " of channel", -1));
 	}
 	return TCL_ERROR;
     }
@@ -7547,6 +7558,7 @@ Tcl_BadChannelOption(
 	const char **argv;
 	int argc, i;
 	Tcl_DString ds;
+        Tcl_Obj *errObj;
 
 	Tcl_DStringInit(&ds);
 	Tcl_DStringAppend(&ds, genericopt, -1);
@@ -7559,13 +7571,14 @@ Tcl_BadChannelOption(
 	    Tcl_Panic("malformed option list in channel driver");
 	}
 	Tcl_ResetResult(interp);
-	Tcl_AppendResult(interp, "bad option \"", optionName,
-		"\": should be one of ", NULL);
+	errObj = Tcl_ObjPrintf("bad option \"%s\": should be one of ",
+                optionName);
 	argc--;
 	for (i = 0; i < argc; i++) {
-	    Tcl_AppendResult(interp, "-", argv[i], ", ", NULL);
+	    Tcl_AppendPrintfToObj(errObj, "-%s, ", argv[i]);
 	}
-	Tcl_AppendResult(interp, "or -", argv[i], NULL);
+	Tcl_AppendPrintfToObj(errObj, "or -%s", argv[i]);
+        Tcl_SetObjResult(interp, errObj);
 	Tcl_DStringFree(&ds);
 	ckfree(argv);
     }
@@ -7843,8 +7856,9 @@ Tcl_SetChannelOption(
 
     if (statePtr->csPtrR || statePtr->csPtrW) {
 	if (interp) {
-	    Tcl_AppendResult(interp, "unable to set channel options: "
-		    "background copy in progress", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+                    "unable to set channel options: background copy in"
+                    " progress", -1));
 	}
 	return TCL_ERROR;
     }
@@ -7893,8 +7907,9 @@ Tcl_SetChannelOption(
 	    ResetFlag(statePtr, CHANNEL_LINEBUFFERED);
 	    SetFlag(statePtr, CHANNEL_UNBUFFERED);
 	} else if (interp) {
-            Tcl_AppendResult(interp, "bad value for -buffering: "
-		    "must be one of full, line, or none", NULL);
+            Tcl_SetObjResult(interp, Tcl_NewStringObj(
+                    "bad value for -buffering: must be one of"
+                    " full, line, or none", -1));
             return TCL_ERROR;
 	}
 	return TCL_OK;
@@ -7949,8 +7964,9 @@ Tcl_SetChannelOption(
 
 	    if (inValue & 0x80 || outValue & 0x80) {
 		if (interp) {
-		    Tcl_AppendResult(interp, "bad value for -eofchar: ",
-			    "must be non-NUL ASCII character", NULL);
+		    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+                            "bad value for -eofchar: must be non-NUL ASCII"
+                            " character", -1));
 		}
 		ckfree(argv);
 		return TCL_ERROR;
@@ -7963,9 +7979,9 @@ Tcl_SetChannelOption(
 	    }
 	} else {
 	    if (interp) {
-		Tcl_AppendResult(interp,
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
 			"bad value for -eofchar: should be a list of zero,"
-			" one, or two elements", NULL);
+			" one, or two elements", -1));
 	    }
 	    ckfree(argv);
 	    return TCL_ERROR;
@@ -7997,9 +8013,9 @@ Tcl_SetChannelOption(
 	    writeMode = GotFlag(statePtr, TCL_WRITABLE) ? argv[1] : NULL;
 	} else {
 	    if (interp) {
-		Tcl_AppendResult(interp,
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
 			"bad value for -translation: must be a one or two"
-			" element list", NULL);
+			" element list", -1));
 	    }
 	    ckfree(argv);
 	    return TCL_ERROR;
@@ -8027,10 +8043,9 @@ Tcl_SetChannelOption(
 		translation = TCL_PLATFORM_TRANSLATION;
 	    } else {
 		if (interp) {
-		    Tcl_AppendResult(interp,
-			    "bad value for -translation: "
-			    "must be one of auto, binary, cr, lf, crlf,"
-			    " or platform", NULL);
+		    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			    "bad value for -translation: must be one of "
+                            "auto, binary, cr, lf, crlf, or platform", -1));
 		}
 		ckfree(argv);
 		return TCL_ERROR;
@@ -8078,10 +8093,9 @@ Tcl_SetChannelOption(
 		statePtr->outputTranslation = TCL_PLATFORM_TRANSLATION;
 	    } else {
 		if (interp) {
-		    Tcl_AppendResult(interp,
-			    "bad value for -translation: "
-			    "must be one of auto, binary, cr, lf, crlf,"
-			    " or platform", NULL);
+		    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			    "bad value for -translation: must be one of "
+                            "auto, binary, cr, lf, crlf, or platform", -1));
 		}
 		ckfree(argv);
 		return TCL_ERROR;
@@ -8901,8 +8915,8 @@ Tcl_FileEventObjCmd(
     chanPtr = (Channel *) chan;
     statePtr = chanPtr->state;
     if ((statePtr->flags & mask) == 0) {
-	Tcl_AppendResult(interp, "channel is not ",
-		(mask == TCL_READABLE) ? "readable" : "writable", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf("channel is not %s",
+		(mask == TCL_READABLE) ? "readable" : "writable"));
 	return TCL_ERROR;
     }
 
@@ -9023,15 +9037,15 @@ TclCopyChannel(
 
     if (BUSY_STATE(inStatePtr, TCL_READABLE)) {
 	if (interp) {
-	    Tcl_AppendResult(interp, "channel \"",
-		    Tcl_GetChannelName(inChan), "\" is busy", NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+                    "channel \"%s\" is busy", Tcl_GetChannelName(inChan)));
 	}
 	return TCL_ERROR;
     }
     if (BUSY_STATE(outStatePtr, TCL_WRITABLE)) {
 	if (interp) {
-	    Tcl_AppendResult(interp, "channel \"",
-		    Tcl_GetChannelName(outChan), "\" is busy", NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+                    "channel \"%s\" is busy", Tcl_GetChannelName(outChan)));
 	}
 	return TCL_ERROR;
     }
@@ -10157,8 +10171,9 @@ SetBlockMode(
 	     */
 
 	    if (!TclChanCaughtErrorBypass(interp, (Tcl_Channel) chanPtr)) {
-		Tcl_AppendResult(interp, "error setting blocking mode: ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+                        "error setting blocking mode: %s",
+			Tcl_PosixError(interp)));
 	    }
 	} else {
 	    /*
diff --git a/generic/tclIOCmd.c b/generic/tclIOCmd.c
index 59856d0..005713d 100644
--- a/generic/tclIOCmd.c
+++ b/generic/tclIOCmd.c
@@ -174,9 +174,10 @@ Tcl_PutsObjCmd(
     if (TclGetChannelFromObj(interp, chanObjPtr, &chan, &mode, 0) != TCL_OK) {
 	return TCL_ERROR;
     }
-    if ((mode & TCL_WRITABLE) == 0) {
-	Tcl_AppendResult(interp, "channel \"", TclGetString(chanObjPtr),
-		"\" wasn't opened for writing", NULL);
+    if (!(mode & TCL_WRITABLE)) {
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"channel \"%s\" wasn't opened for writing",
+		TclGetString(chanObjPtr)));
 	return TCL_ERROR;
     }
 
@@ -201,8 +202,8 @@ Tcl_PutsObjCmd(
 
   error:
     if (!TclChanCaughtErrorBypass(interp, chan)) {
-	Tcl_AppendResult(interp, "error writing \"", TclGetString(chanObjPtr),
-		"\": ", Tcl_PosixError(interp), NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf("error writing \"%s\": %s",
+		TclGetString(chanObjPtr), Tcl_PosixError(interp)));
     }
     return TCL_ERROR;
 }
@@ -244,9 +245,10 @@ Tcl_FlushObjCmd(
     if (TclGetChannelFromObj(interp, chanObjPtr, &chan, &mode, 0) != TCL_OK) {
 	return TCL_ERROR;
     }
-    if ((mode & TCL_WRITABLE) == 0) {
-	Tcl_AppendResult(interp, "channel \"", TclGetString(chanObjPtr),
-		"\" wasn't opened for writing", NULL);
+    if (!(mode & TCL_WRITABLE)) {
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"channel \"%s\" wasn't opened for writing",
+		TclGetString(chanObjPtr)));
 	return TCL_ERROR;
     }
 
@@ -259,9 +261,9 @@ Tcl_FlushObjCmd(
 	 */
 
 	if (!TclChanCaughtErrorBypass(interp, chan)) {
-	    Tcl_AppendResult(interp, "error flushing \"",
-		    TclGetString(chanObjPtr), "\": ", Tcl_PosixError(interp),
-		    NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "error flushing \"%s\": %s",
+		    TclGetString(chanObjPtr), Tcl_PosixError(interp)));
 	}
 	return TCL_ERROR;
     }
@@ -306,9 +308,10 @@ Tcl_GetsObjCmd(
     if (TclGetChannelFromObj(interp, chanObjPtr, &chan, &mode, 0) != TCL_OK) {
 	return TCL_ERROR;
     }
-    if ((mode & TCL_READABLE) == 0) {
-	Tcl_AppendResult(interp, "channel \"", TclGetString(chanObjPtr),
-		"\" wasn't opened for reading", NULL);
+    if (!(mode & TCL_READABLE)) {
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"channel \"%s\" wasn't opened for reading",
+		TclGetString(chanObjPtr)));
 	return TCL_ERROR;
     }
 
@@ -326,10 +329,9 @@ Tcl_GetsObjCmd(
 	     */
 
 	    if (!TclChanCaughtErrorBypass(interp, chan)) {
-		Tcl_ResetResult(interp);
-		Tcl_AppendResult(interp, "error reading \"",
-			TclGetString(chanObjPtr), "\": ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"error reading \"%s\": %s",
+			TclGetString(chanObjPtr), Tcl_PosixError(interp)));
 	    }
 	    return TCL_ERROR;
 	}
@@ -411,9 +413,10 @@ Tcl_ReadObjCmd(
     if (TclGetChannelFromObj(interp, chanObjPtr, &chan, &mode, 0) != TCL_OK) {
 	return TCL_ERROR;
     }
-    if ((mode & TCL_READABLE) == 0) {
-	Tcl_AppendResult(interp, "channel \"", TclGetString(chanObjPtr),
-		"\" wasn't opened for reading", NULL);
+    if (!(mode & TCL_READABLE)) {
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"channel \"%s\" wasn't opened for reading",
+		TclGetString(chanObjPtr)));
 	return TCL_ERROR;
     }
     i++;			/* Consumed channel name. */
@@ -436,11 +439,11 @@ Tcl_ReadObjCmd(
 
 	    if (strcmp(TclGetString(objv[i]), "nonewline") != 0) {
 #endif
-	    Tcl_ResetResult(interp);
-	    Tcl_AppendResult(interp, "expected non-negative integer but got \"",
-		    TclGetString(objv[i]), "\"", NULL);
-	    Tcl_SetErrorCode(interp, "TCL", "VALUE", "NUMBER", NULL);
-	    return TCL_ERROR;
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"expected non-negative integer but got \"%s\"",
+			TclGetString(objv[i])));
+		Tcl_SetErrorCode(interp, "TCL", "VALUE", "NUMBER", NULL);
+		return TCL_ERROR;
 #if TCL_MAJOR_VERSION < 9
 	    }
 	    newline = 1;
@@ -460,10 +463,9 @@ Tcl_ReadObjCmd(
 	 */
 
 	if (!TclChanCaughtErrorBypass(interp, chan)) {
-	    Tcl_ResetResult(interp);
-	    Tcl_AppendResult(interp, "error reading \"",
-		    TclGetString(chanObjPtr), "\": ", Tcl_PosixError(interp),
-		    NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "error reading \"%s\": %s",
+		    TclGetString(chanObjPtr), Tcl_PosixError(interp)));
 	}
 	Tcl_DecrRefCount(resultPtr);
 	return TCL_ERROR;
@@ -552,9 +554,9 @@ Tcl_SeekObjCmd(
 	 */
 
 	if (!TclChanCaughtErrorBypass(interp, chan)) {
-	    Tcl_AppendResult(interp, "error during seek on \"",
-		    TclGetString(objv[1]), "\": ", Tcl_PosixError(interp),
-		    NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "error during seek on \"%s\": %s",
+		    TclGetString(objv[1]), Tcl_PosixError(interp)));
 	}
 	return TCL_ERROR;
     }
@@ -679,9 +681,9 @@ Tcl_CloseObjCmd(
 	 */
 
 	if (!(dir & Tcl_GetChannelMode(chan))) {
-	    Tcl_AppendResult(interp, "Half-close of ", dirOptions[index],
-		    "-side not possible, side not opened or already closed",
-		    NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "Half-close of %s-side not possible, side not opened"
+		    " or already closed", dirOptions[index]));
 	    return TCL_ERROR;
 	}
 
@@ -977,9 +979,9 @@ Tcl_ExecObjCmd(
 	     */
 
 	    if (!TclChanCaughtErrorBypass(interp, chan)) {
-		Tcl_ResetResult(interp);
-		Tcl_AppendResult(interp, "error reading output from command: ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"error reading output from command: %s",
+			Tcl_PosixError(interp)));
 		Tcl_DecrRefCount(resultPtr);
 	    }
 	    return TCL_ERROR;
@@ -1048,9 +1050,10 @@ Tcl_FblockedObjCmd(
     if (TclGetChannelFromObj(interp, objv[1], &chan, &mode, 0) != TCL_OK) {
 	return TCL_ERROR;
     }
-    if ((mode & TCL_READABLE) == 0) {
-	Tcl_AppendResult(interp, "channel \"", TclGetString(objv[1]),
-		"\" wasn't opened for reading", NULL);
+    if (!(mode & TCL_READABLE)) {
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"channel \"%s\" wasn't opened for reading",
+		TclGetString(objv[1])));
 	return TCL_ERROR;
     }
 
@@ -1174,7 +1177,7 @@ Tcl_OpenObjCmd(
 	return TCL_ERROR;
     }
     Tcl_RegisterChannel(interp, chan);
-    Tcl_AppendResult(interp, Tcl_GetChannelName(chan), NULL);
+    Tcl_SetObjResult(interp, Tcl_NewStringObj(Tcl_GetChannelName(chan), -1));
     return TCL_OK;
 }
 
@@ -1479,8 +1482,8 @@ Tcl_SocketObjCmd(
 	switch ((enum socketOptions) optionIndex) {
 	case SKT_ASYNC:
 	    if (server == 1) {
-		Tcl_AppendResult(interp,
-			"cannot set -async option for server sockets", NULL);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"cannot set -async option for server sockets", -1));
 		return TCL_ERROR;
 	    }
 	    async = 1;
@@ -1488,8 +1491,8 @@ Tcl_SocketObjCmd(
 	case SKT_MYADDR:
 	    a++;
 	    if (a >= objc) {
-		Tcl_AppendResult(interp,
-			"no argument given for -myaddr option", NULL);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"no argument given for -myaddr option", -1));
 		return TCL_ERROR;
 	    }
 	    myaddr = TclGetString(objv[a]);
@@ -1499,8 +1502,8 @@ Tcl_SocketObjCmd(
 
 	    a++;
 	    if (a >= objc) {
-		Tcl_AppendResult(interp,
-			"no argument given for -myport option", NULL);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"no argument given for -myport option", -1));
 		return TCL_ERROR;
 	    }
 	    myPortName = TclGetString(objv[a]);
@@ -1511,15 +1514,15 @@ Tcl_SocketObjCmd(
 	}
 	case SKT_SERVER:
 	    if (async == 1) {
-		Tcl_AppendResult(interp,
-			"cannot set -async option for server sockets", NULL);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"cannot set -async option for server sockets", -1));
 		return TCL_ERROR;
 	    }
 	    server = 1;
 	    a++;
 	    if (a >= objc) {
-		Tcl_AppendResult(interp,
-			"no argument given for -server option", NULL);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"no argument given for -server option", -1));
 		return TCL_ERROR;
 	    }
 	    script = TclGetString(objv[a]);
@@ -1531,8 +1534,8 @@ Tcl_SocketObjCmd(
     if (server) {
 	host = myaddr;		/* NULL implies INADDR_ANY */
 	if (myport != 0) {
-	    Tcl_AppendResult(interp, "option -myport is not valid for servers",
-		    NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "option -myport is not valid for servers", -1));
 	    return TCL_ERROR;
 	}
     } else if (a < objc) {
@@ -1599,9 +1602,9 @@ Tcl_SocketObjCmd(
 	    return TCL_ERROR;
 	}
     }
-    Tcl_RegisterChannel(interp, chan);
-    Tcl_AppendResult(interp, Tcl_GetChannelName(chan), NULL);
 
+    Tcl_RegisterChannel(interp, chan);
+    Tcl_SetObjResult(interp, Tcl_NewStringObj(Tcl_GetChannelName(chan), -1));
     return TCL_OK;
 }
 
@@ -1651,17 +1654,19 @@ Tcl_FcopyObjCmd(
     if (TclGetChannelFromObj(interp, objv[1], &inChan, &mode, 0) != TCL_OK) {
 	return TCL_ERROR;
     }
-    if ((mode & TCL_READABLE) == 0) {
-	Tcl_AppendResult(interp, "channel \"", TclGetString(objv[1]),
-		"\" wasn't opened for reading", NULL);
+    if (!(mode & TCL_READABLE)) {
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"channel \"%s\" wasn't opened for reading",
+		TclGetString(objv[1])));
 	return TCL_ERROR;
     }
     if (TclGetChannelFromObj(interp, objv[2], &outChan, &mode, 0) != TCL_OK) {
 	return TCL_ERROR;
     }
-    if ((mode & TCL_WRITABLE) == 0) {
-	Tcl_AppendResult(interp, "channel \"", TclGetString(objv[2]),
-		"\" wasn't opened for writing", NULL);
+    if (!(mode & TCL_WRITABLE)) {
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"channel \"%s\" wasn't opened for writing",
+		TclGetString(objv[2])));
 	return TCL_ERROR;
     }
 
@@ -1745,14 +1750,14 @@ ChanPendingObjCmd(
 
     switch ((enum options) index) {
     case PENDING_INPUT:
-	if ((mode & TCL_READABLE) == 0) {
+	if (!(mode & TCL_READABLE)) {
 	    Tcl_SetObjResult(interp, Tcl_NewIntObj(-1));
 	} else {
 	    Tcl_SetObjResult(interp, Tcl_NewIntObj(Tcl_InputBuffered(chan)));
 	}
 	break;
     case PENDING_OUTPUT:
-	if ((mode & TCL_WRITABLE) == 0) {
+	if (!(mode & TCL_WRITABLE)) {
 	    Tcl_SetObjResult(interp, Tcl_NewIntObj(-1));
 	} else {
 	    Tcl_SetObjResult(interp, Tcl_NewIntObj(Tcl_OutputBuffered(chan)));
@@ -1806,8 +1811,8 @@ ChanTruncateObjCmd(
 	    return TCL_ERROR;
 	}
 	if (length < 0) {
-	    Tcl_AppendResult(interp,
-		    "cannot truncate to negative length of file", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "cannot truncate to negative length of file", -1));
 	    return TCL_ERROR;
 	}
     } else {
@@ -1817,18 +1822,17 @@ ChanTruncateObjCmd(
 
 	length = Tcl_Tell(chan);
 	if (length == Tcl_WideAsLong(-1)) {
-	    Tcl_AppendResult(interp,
-		    "could not determine current location in \"",
-		    TclGetString(objv[1]), "\": ",
-		    Tcl_PosixError(interp), NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "could not determine current location in \"%s\": %s",
+		    TclGetString(objv[1]), Tcl_PosixError(interp)));
 	    return TCL_ERROR;
 	}
     }
 
     if (Tcl_TruncateChannel(chan, length) != TCL_OK) {
-	Tcl_AppendResult(interp, "error during truncate on \"",
-		TclGetString(objv[1]), "\": ",
-		Tcl_PosixError(interp), NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"error during truncate on \"%s\": %s",
+		TclGetString(objv[1]), Tcl_PosixError(interp)));
 	return TCL_ERROR;
     }
 
diff --git a/generic/tclIOGT.c b/generic/tclIOGT.c
index 6f80c25..bfe6a10 100644
--- a/generic/tclIOGT.c
+++ b/generic/tclIOGT.c
@@ -284,8 +284,8 @@ TclChannelTransform(
     dataPtr->self = Tcl_StackChannel(interp, &transformChannelType, dataPtr,
 	    mode, chan);
     if (dataPtr->self == NULL) {
-	Tcl_AppendResult(interp, "\nfailed to stack channel \"",
-		Tcl_GetChannelName(chan), "\"", NULL);
+	Tcl_AppendPrintfToObj(Tcl_GetObjResult(interp),
+		"\nfailed to stack channel \"%s\"", Tcl_GetChannelName(chan));
 	Tcl_DecrRefCount(dataPtr->command);
 	ResultClear(&dataPtr->result);
 	ckfree(dataPtr);
diff --git a/generic/tclIORChan.c b/generic/tclIORChan.c
index eeb11f9..cb0282a 100644
--- a/generic/tclIORChan.c
+++ b/generic/tclIORChan.c
@@ -404,25 +404,25 @@ static int		ForwardProc(Tcl_Event *evPtr, int mask);
 static void		SrcExitProc(ClientData clientData);
 
 #define FreeReceivedError(p) \
-	if ((p)->base.mustFree) { \
-	    ckfree((p)->base.msgStr); \
+	if ((p)->base.mustFree) {                               \
+	    ckfree((p)->base.msgStr);                           \
 	}
 #define PassReceivedErrorInterp(i,p) \
-	if ((i) != NULL) { \
-	    Tcl_SetChannelErrorInterp((i), \
-		    Tcl_NewStringObj((p)->base.msgStr, -1)); \
-	} \
+	if ((i) != NULL) {                                      \
+	    Tcl_SetChannelErrorInterp((i),                      \
+		    Tcl_NewStringObj((p)->base.msgStr, -1));    \
+	}                                                       \
 	FreeReceivedError(p)
 #define PassReceivedError(c,p) \
 	Tcl_SetChannelError((c), Tcl_NewStringObj((p)->base.msgStr, -1)); \
 	FreeReceivedError(p)
 #define ForwardSetStaticError(p,emsg) \
-	(p)->base.code = TCL_ERROR; \
-	(p)->base.mustFree = 0; \
+	(p)->base.code = TCL_ERROR;                             \
+	(p)->base.mustFree = 0;                                 \
 	(p)->base.msgStr = (char *) (emsg)
 #define ForwardSetDynamicError(p,emsg) \
-	(p)->base.code = TCL_ERROR; \
-	(p)->base.mustFree = 1; \
+	(p)->base.code = TCL_ERROR;                             \
+	(p)->base.mustFree = 1;                                 \
 	(p)->base.msgStr = (char *) (emsg)
 
 static void		ForwardSetObjError(ForwardParam *p, Tcl_Obj *objPtr);
@@ -775,13 +775,15 @@ TclChanCreateObjCmd(
  */
 
 typedef struct ReflectEvent {
-    Tcl_Event         header;
-    ReflectedChannel* rcPtr;
-    int               events;
+    Tcl_Event header;
+    ReflectedChannel *rcPtr;
+    int events;
 } ReflectEvent;
 
 static int
-ReflectEventRun (Tcl_Event* ev, int flags)
+ReflectEventRun(
+    Tcl_Event *ev,
+    int flags)
 {
     /* OWNER thread
      *
@@ -790,14 +792,16 @@ ReflectEventRun (Tcl_Event* ev, int flags)
      * accomplishing that.
      */
 
-    ReflectEvent* e = (ReflectEvent*) ev;
+    ReflectEvent *e = (ReflectEvent *) ev;
 
-    Tcl_NotifyChannel (e->rcPtr->chan, e->events);
+    Tcl_NotifyChannel(e->rcPtr->chan, e->events);
     return 1;
 }
 
 static int
-ReflectEventDelete (Tcl_Event* ev, ClientData cd)
+ReflectEventDelete(
+    Tcl_Event *ev,
+    ClientData cd)
 {
     /* OWNER thread
      *
@@ -806,11 +810,9 @@ ReflectEventDelete (Tcl_Event* ev, ClientData cd)
      * invalid channel.
      */
 
-    ReflectEvent* e = (ReflectEvent*) ev;
+    ReflectEvent *e = (ReflectEvent *) ev;
 
-    if ((ev->proc != ReflectEventRun) ||
-        ((cd != NULL) &&
-         (cd != e->rcPtr))) {
+    if ((ev->proc != ReflectEventRun) || ((cd != NULL) && (cd != e->rcPtr))) {
         return 0;
     }
     return 1;
@@ -868,8 +870,8 @@ TclChanPostEventObjCmd(
     hPtr = Tcl_FindHashEntry(&rcmPtr->map, chanId);
 
     if (hPtr == NULL) {
-	Tcl_AppendResult(interp, "can not find reflected channel named \"",
-		chanId, "\"", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+                "can not find reflected channel named \"%s\"", chanId));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "CHANNEL", chanId, NULL);
 	return TCL_ERROR;
     }
@@ -926,8 +928,9 @@ TclChanPostEventObjCmd(
      */
 
     if (events & ~rcPtr->interest) {
-	Tcl_AppendResult(interp, "tried to post events channel \"", chanId,
-		"\" is not interested in", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+                "tried to post events channel \"%s\" is not interested in",
+                chanId));
 	return TCL_ERROR;
     }
 
@@ -938,10 +941,11 @@ TclChanPostEventObjCmd(
 #ifdef TCL_THREADS
     if (rcPtr->owner == rcPtr->thread) {
 #endif
-        Tcl_NotifyChannel (chan, events);
+        Tcl_NotifyChannel(chan, events);
 #ifdef TCL_THREADS
     } else {
-        ReflectEvent* ev = ckalloc (sizeof (ReflectEvent));
+        ReflectEvent *ev = ckalloc(sizeof(ReflectEvent));
+
         ev->header.proc = ReflectEventRun;
         ev->events = events;
         ev->rcPtr = rcPtr;
@@ -958,7 +962,8 @@ TclChanPostEventObjCmd(
          * The teardown of unprocessed events is currently coupled to the
          * thread reflected channel map
          */
-        (void) GetThreadReflectedChannelMap ();
+
+        (void) GetThreadReflectedChannelMap();
 
         /* XXX Race condition !!
          * XXX The destination thread may not exist anymore already.
@@ -966,8 +971,9 @@ TclChanPostEventObjCmd(
          * XXX Can we detect this ? (check the validity of the owner threadid ?)
          * XXX Actually, in that case the channel should be dead also !
          */
-        Tcl_ThreadQueueEvent (rcPtr->owner, (Tcl_Event*) ev, TCL_QUEUE_TAIL);
-        Tcl_ThreadAlert (rcPtr->owner);
+
+        Tcl_ThreadQueueEvent(rcPtr->owner, (Tcl_Event *) ev, TCL_QUEUE_TAIL);
+        Tcl_ThreadAlert(rcPtr->owner);
     }
 #endif
 
@@ -1157,8 +1163,11 @@ ReflectClose(
 	    ForwardOpToHandlerThread(rcPtr, ForwardedClose, &p);
 	    result = p.base.code;
 
-            /* Now squash the pending reflection events for this channel. */
-            Tcl_DeleteEvents (ReflectEventDelete, rcPtr);
+            /*
+             * Now squash the pending reflection events for this channel.
+             */
+
+            Tcl_DeleteEvents(ReflectEventDelete, rcPtr);
 
 	    if (result != TCL_OK) {
 		FreeReceivedError(&p);
@@ -1166,7 +1175,7 @@ ReflectClose(
 	}
 #endif
 
-        Tcl_EventuallyFree (rcPtr, (Tcl_FreeProc *) FreeReflectedChannel);
+        Tcl_EventuallyFree(rcPtr, (Tcl_FreeProc *) FreeReflectedChannel);
 	return EOK;
     }
 
@@ -1178,7 +1187,7 @@ ReflectClose(
      */
 
     if (rcPtr->methods == 0) {
-        Tcl_EventuallyFree (rcPtr, (Tcl_FreeProc *) FreeReflectedChannel);
+        Tcl_EventuallyFree(rcPtr, (Tcl_FreeProc *) FreeReflectedChannel);
 	return EOK;
     }
 
@@ -1193,10 +1202,13 @@ ReflectClose(
 	ForwardOpToHandlerThread(rcPtr, ForwardedClose, &p);
 	result = p.base.code;
 
-        /* Now squash the pending reflection events for this channel. */
-        Tcl_DeleteEvents (ReflectEventDelete, rcPtr);
+        /*
+         * Now squash the pending reflection events for this channel.
+         */
+
+        Tcl_DeleteEvents(ReflectEventDelete, rcPtr);
 
-        Tcl_EventuallyFree (rcPtr, (Tcl_FreeProc *) FreeReflectedChannel);
+        Tcl_EventuallyFree(rcPtr, (Tcl_FreeProc *) FreeReflectedChannel);
 
 	if (result != TCL_OK) {
 	    PassReceivedErrorInterp(interp, &p);
@@ -1241,7 +1253,7 @@ ReflectClose(
 	}
 #endif
 
-        Tcl_EventuallyFree (rcPtr, (Tcl_FreeProc *) FreeReflectedChannel);
+        Tcl_EventuallyFree(rcPtr, (Tcl_FreeProc *) FreeReflectedChannel);
 #ifdef TCL_THREADS
     }
 #endif
@@ -1349,7 +1361,7 @@ ReflectInput(
     *errorCodePtr = EOK;
 
     if (bytec > 0) {
-	memcpy(buf, bytev, (size_t)bytec);
+	memcpy(buf, bytev, (size_t) bytec);
     }
 
  stop:
@@ -1550,12 +1562,13 @@ ReflectSeekWide(
     Tcl_Preserve(rcPtr);
 
     offObj  = Tcl_NewWideIntObj(offset);
-    baseObj = Tcl_NewStringObj((seekMode == SEEK_SET) ? "start" :
-                               ((seekMode == SEEK_CUR) ? "current" : "end"), -1);
+    baseObj = Tcl_NewStringObj(
+            (seekMode == SEEK_SET) ? "start" :
+            (seekMode == SEEK_CUR) ? "current" : "end", -1);
     Tcl_IncrRefCount(offObj);
     Tcl_IncrRefCount(baseObj);
 
-    if (InvokeTclMethod(rcPtr, "seek", offObj, baseObj, &resObj)!=TCL_OK) {
+    if (InvokeTclMethod(rcPtr, "seek", offObj, baseObj, &resObj) != TCL_OK) {
 	Tcl_SetChannelError(rcPtr->chan, resObj);
         goto invalid;
     }
@@ -1761,7 +1774,9 @@ ReflectBlock(
  */
 
 static void
-ReflectThread(ClientData clientData, int action)
+ReflectThread(
+    ClientData clientData,
+    int action)
 {
     ReflectedChannel *rcPtr = clientData;
 
@@ -1773,7 +1788,7 @@ ReflectThread(ClientData clientData, int action)
         rcPtr->owner = NULL;
         break;
     default:
-        Tcl_Panic ("Unknown thread action code.");
+        Tcl_Panic("Unknown thread action code.");
         break;
     }
 }
@@ -2047,7 +2062,8 @@ EncodeEventMask(
     }
 
     if (listc < 1) {
-	Tcl_AppendResult(interp, "bad ", objName, " list: is empty", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+                "bad %s list: is empty", objName));
 	return TCL_ERROR;
     }
 
@@ -2808,7 +2824,7 @@ DeleteThreadReflectedChannelMap(
      * actually.
      */
 
-    Tcl_DeleteEvents (ReflectEventDelete, NULL);
+    Tcl_DeleteEvents(ReflectEventDelete, NULL);
 
     /*
      * Get the map of all channels handled by the current thread. This is a
@@ -2979,9 +2995,8 @@ ForwardProc(
     Tcl_Interp *interp = rcPtr->interp;
     ForwardParam *paramPtr = evPtr->param;
     Tcl_Obj *resObj = NULL;	/* Interp result of InvokeTclMethod */
-    ReflectedChannelMap *rcmPtr;
-    /* Map of reflected channels with handlers in
-     * this interp. */
+    ReflectedChannelMap *rcmPtr;/* Map of reflected channels with handlers in
+                                 * this interp. */
     Tcl_HashEntry *hPtr;	/* Entry in the above map */
 
     /*
@@ -3024,12 +3039,12 @@ ForwardProc(
 
 	rcmPtr = GetReflectedChannelMap(interp);
 	hPtr = Tcl_FindHashEntry(&rcmPtr->map,
-                                 Tcl_GetChannelName(rcPtr->chan));
+                Tcl_GetChannelName(rcPtr->chan));
 	Tcl_DeleteHashEntry(hPtr);
 
 	rcmPtr = GetThreadReflectedChannelMap();
 	hPtr = Tcl_FindHashEntry(&rcmPtr->map,
-                                 Tcl_GetChannelName(rcPtr->chan));
+                Tcl_GetChannelName(rcPtr->chan));
 	Tcl_DeleteHashEntry(hPtr);
 
 	FreeReflectedChannelArgs(rcPtr);
@@ -3064,7 +3079,7 @@ ForwardProc(
 		paramPtr->input.toRead = -1;
 	    } else {
 		if (bytec > 0) {
-		    memcpy(paramPtr->input.buf, bytev, (size_t)bytec);
+		    memcpy(paramPtr->input.buf, bytev, (size_t) bytec);
 		}
 		paramPtr->input.toRead = bytec;
 	    }
@@ -3076,7 +3091,7 @@ ForwardProc(
 
     case ForwardedOutput: {
 	Tcl_Obj *bufObj = Tcl_NewByteArrayObj((unsigned char *)
-                                              paramPtr->output.buf, paramPtr->output.toWrite);
+                paramPtr->output.buf, paramPtr->output.toWrite);
         Tcl_IncrRefCount(bufObj);
 
         Tcl_Preserve(rcPtr);
@@ -3116,8 +3131,8 @@ ForwardProc(
     case ForwardedSeek: {
 	Tcl_Obj *offObj = Tcl_NewWideIntObj(paramPtr->seek.offset);
 	Tcl_Obj *baseObj = Tcl_NewStringObj(
-                                            (paramPtr->seek.seekMode==SEEK_SET) ? "start" :
-                                            (paramPtr->seek.seekMode==SEEK_CUR) ? "current" : "end", -1);
+                (paramPtr->seek.seekMode==SEEK_SET) ? "start" :
+                (paramPtr->seek.seekMode==SEEK_CUR) ? "current" : "end", -1);
 
         Tcl_IncrRefCount(offObj);
         Tcl_IncrRefCount(baseObj);
@@ -3167,11 +3182,11 @@ ForwardProc(
 
     case ForwardedBlock: {
 	Tcl_Obj *blockObj = Tcl_NewBooleanObj(!paramPtr->block.nonblocking);
-        Tcl_IncrRefCount(blockObj);
 
+        Tcl_IncrRefCount(blockObj);
         Tcl_Preserve(rcPtr);
 	if (InvokeTclMethod(rcPtr, "blocking", blockObj, NULL,
-                            &resObj) != TCL_OK) {
+                &resObj) != TCL_OK) {
 	    ForwardSetObjError(paramPtr, resObj);
 	}
         Tcl_Release(rcPtr);
@@ -3187,7 +3202,7 @@ ForwardProc(
         Tcl_IncrRefCount(valueObj);
         Tcl_Preserve(rcPtr);
 	if (InvokeTclMethod(rcPtr, "configure", optionObj, valueObj,
-                            &resObj) != TCL_OK) {
+                &resObj) != TCL_OK) {
 	    ForwardSetObjError(paramPtr, resObj);
 	}
         Tcl_Release(rcPtr);
@@ -3202,8 +3217,8 @@ ForwardProc(
 	 */
 
 	Tcl_Obj *optionObj = Tcl_NewStringObj(paramPtr->getOpt.name, -1);
-        Tcl_IncrRefCount(optionObj);
 
+        Tcl_IncrRefCount(optionObj);
         Tcl_Preserve(rcPtr);
 	if (InvokeTclMethod(rcPtr, "cget", optionObj, NULL, &resObj)!=TCL_OK){
 	    ForwardSetObjError(paramPtr, resObj);
diff --git a/generic/tclIORTrans.c b/generic/tclIORTrans.c
index 8f111b0..2b9efb9 100644
--- a/generic/tclIORTrans.c
+++ b/generic/tclIORTrans.c
@@ -363,33 +363,43 @@ static int		ForwardProc(Tcl_Event *evPtr, int mask);
 static void		SrcExitProc(ClientData clientData);
 
 #define FreeReceivedError(p) \
-	if ((p)->base.mustFree) { \
-	    ckfree((p)->base.msgStr); \
-	}
+	do {								\
+	    if ((p)->base.mustFree) {					\
+		ckfree((p)->base.msgStr);				\
+	    }								\
+	} while (0)
 #define PassReceivedErrorInterp(i,p) \
-	if ((i) != NULL) { \
-	    Tcl_SetChannelErrorInterp((i), \
-		    Tcl_NewStringObj((p)->base.msgStr, -1)); \
-	} \
-	FreeReceivedError(p)
+	do {								\
+	    if ((i) != NULL) {						\
+		Tcl_SetChannelErrorInterp((i),				\
+			Tcl_NewStringObj((p)->base.msgStr, -1));	\
+	    }								\
+	    FreeReceivedError(p);					\
+	} while (0)
 #define PassReceivedError(c,p) \
-	Tcl_SetChannelError((c), Tcl_NewStringObj((p)->base.msgStr, -1)); \
-	FreeReceivedError(p)
+	do {								\
+	    Tcl_SetChannelError((c),					\
+		    Tcl_NewStringObj((p)->base.msgStr, -1));		\
+	    FreeReceivedError(p);					\
+	} while (0)
 #define ForwardSetStaticError(p,emsg) \
-	(p)->base.code = TCL_ERROR; \
-	(p)->base.mustFree = 0; \
-	(p)->base.msgStr = (char *) (emsg)
+	do {								\
+	    (p)->base.code = TCL_ERROR;					\
+	    (p)->base.mustFree = 0;					\
+	    (p)->base.msgStr = (char *) (emsg);				\
+	} while (0)
 #define ForwardSetDynamicError(p,emsg) \
-	(p)->base.code = TCL_ERROR; \
-	(p)->base.mustFree = 1; \
-	(p)->base.msgStr = (char *) (emsg)
+	do {								\
+	    (p)->base.code = TCL_ERROR;					\
+	    (p)->base.mustFree = 1;					\
+	    (p)->base.msgStr = (char *) (emsg);				\
+	} while (0)
 
 static void		ForwardSetObjError(ForwardParam *p,
 			    Tcl_Obj *objPtr);
-
 static ReflectedTransformMap *	GetThreadReflectedTransformMap(void);
-static void		DeleteThreadReflectedTransformMap(ClientData clientData);
-
+static void		DeleteThreadReflectedTransformMap(
+			    ClientData clientData);
 #endif /* TCL_THREADS */
 
 #define SetChannelErrorStr(c,msgStr) \
@@ -513,7 +523,6 @@ TclChanPushObjCmd(
     int result;			/* Result code for 'initialize' */
     Tcl_Obj *resObj;		/* Result data for 'initialize' */
     int methods;		/* Bitmask for supported methods. */
-    Tcl_Obj *err;		/* Error message */
     ReflectedTransformMap *rtmPtr;
 				/* Map of reflected transforms with handlers
 				 * in this interp. */
@@ -608,11 +617,10 @@ TclChanPushObjCmd(
     while (listc > 0) {
 	if (Tcl_GetIndexFromObj(interp, listv[listc-1], methodNames,
 		"method", TCL_EXACT, &methIndex) != TCL_OK) {
-	    TclNewLiteralStringObj(err, "chan handler \"");
-	    Tcl_AppendObjToObj(err, cmdObj);
-	    Tcl_AppendToObj(err, " initialize\" returned ", -1);
-	    Tcl_AppendObjToObj(err, Tcl_GetObjResult(interp));
-	    Tcl_SetObjResult(interp, err);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "chan handler \"%s initialize\" returned %s",
+		    Tcl_GetString(cmdObj),
+		    Tcl_GetString(Tcl_GetObjResult(interp))));
 	    Tcl_DecrRefCount(resObj);
 	    goto error;
 	}
@@ -695,13 +703,14 @@ TclChanPushObjCmd(
     rtmPtr = GetThreadReflectedTransformMap();
     hPtr = Tcl_CreateHashEntry(&rtmPtr->map, Tcl_GetString(rtId), &isNew);
     Tcl_SetHashValue(hPtr, rtPtr);
-#endif
+#endif /* TCL_THREADS */
 
     /*
      * Return the channel as the result of the command.
      */
 
-    Tcl_AppendResult(interp, Tcl_GetChannelName(rtPtr->chan), NULL);
+    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+	    Tcl_GetChannelName(rtPtr->chan), -1));
     return TCL_OK;
 
   error:
@@ -710,7 +719,7 @@ TclChanPushObjCmd(
      * structure.
      */
 
-    Tcl_EventuallyFree (rtPtr, (Tcl_FreeProc *) FreeReflectedTransform);
+    Tcl_EventuallyFree(rtPtr, (Tcl_FreeProc *) FreeReflectedTransform);
     return TCL_ERROR;
 
 #undef CHAN
@@ -913,9 +922,9 @@ ReflectClose(
 		FreeReceivedError(&p);
 	    }
 	}
-#endif
+#endif /* TCL_THREADS */
 
-	Tcl_EventuallyFree (rtPtr, (Tcl_FreeProc *) FreeReflectedTransform);
+	Tcl_EventuallyFree(rtPtr, (Tcl_FreeProc *) FreeReflectedTransform);
 	return EOK;
     }
 
@@ -931,11 +940,11 @@ ReflectClose(
 	if (!TransformDrain(rtPtr, &errorCode)) {
 #ifdef TCL_THREADS
 	    if (rtPtr->thread != Tcl_GetCurrentThread()) {
-		Tcl_EventuallyFree (rtPtr,
+		Tcl_EventuallyFree(rtPtr,
 			(Tcl_FreeProc *) FreeReflectedTransform);
 		return errorCode;
 	    } 
-#endif
+#endif /* TCL_THREADS */
 	    errorCodeSet = 1;
 	    goto cleanup;
 	}
@@ -945,11 +954,11 @@ ReflectClose(
 	if (!TransformFlush(rtPtr, &errorCode, FLUSH_WRITE)) {
 #ifdef TCL_THREADS
 	    if (rtPtr->thread != Tcl_GetCurrentThread()) {
-		Tcl_EventuallyFree (rtPtr,
+		Tcl_EventuallyFree(rtPtr,
 			(Tcl_FreeProc *) FreeReflectedTransform);
 		return errorCode;
 	    } 
-#endif
+#endif /* TCL_THREADS */
 	    errorCodeSet = 1;
 	    goto cleanup;
 	}
@@ -966,7 +975,7 @@ ReflectClose(
 	ForwardOpToOwnerThread(rtPtr, ForwardedClose, &p);
 	result = p.base.code;
 
-	Tcl_EventuallyFree (rtPtr, (Tcl_FreeProc *) FreeReflectedTransform);
+	Tcl_EventuallyFree(rtPtr, (Tcl_FreeProc *) FreeReflectedTransform);
 
 	if (result != TCL_OK) {
 	    PassReceivedErrorInterp(interp, &p);
@@ -974,7 +983,7 @@ ReflectClose(
 	}
 	return EOK;
     }
-#endif
+#endif /* TCL_THREADS */
 
     /*
      * Do the actual invokation of "finalize" now; we're in the right thread.
@@ -1022,7 +1031,7 @@ ReflectClose(
 	if (hPtr) {
 	    Tcl_DeleteHashEntry(hPtr);
 	}
-#endif
+#endif /* TCL_THREADS */
     }
 
     Tcl_EventuallyFree (rtPtr, (Tcl_FreeProc *) FreeReflectedTransform);
@@ -1348,7 +1357,7 @@ ReflectSeekWide(
 	 * transformation.
 	 */
 
-	if ((rtPtr->methods & FLAG(METH_CLEAR))) {
+	if (rtPtr->methods & FLAG(METH_CLEAR)) {
 	    TransformClear(rtPtr);
 	}
 
@@ -2140,7 +2149,7 @@ DeleteReflectedTransformMap(
     ForwardingResult *resultPtr;
     ForwardingEvent *evPtr;
     ForwardParam *paramPtr;
-#endif
+#endif /* TCL_THREADS */
 
     /*
      * Delete all entries. The channels may have been closed already, or will
@@ -2232,8 +2241,7 @@ DeleteReflectedTransformMap(
 	Tcl_ConditionNotify(&resultPtr->done);
     }
     Tcl_MutexUnlock(&rtForwardMutex);
-
-#endif
+#endif /* TCL_THREADS */
 }
 
 #ifdef TCL_THREADS
@@ -2631,7 +2639,7 @@ ForwardProc(
 	break;
     }
 
-    case ForwardedDrain: {
+    case ForwardedDrain:
 	if (InvokeTclMethod(rtPtr, "drain", NULL, NULL, &resObj) != TCL_OK) {
 	    ForwardSetObjError(paramPtr, resObj);
 	    paramPtr->transform.size = -1;
@@ -2656,9 +2664,8 @@ ForwardProc(
 	    }
 	}
 	break;
-    }
 
-    case ForwardedFlush: {
+    case ForwardedFlush:
 	if (InvokeTclMethod(rtPtr, "flush", NULL, NULL, &resObj) != TCL_OK) {
 	    ForwardSetObjError(paramPtr, resObj);
 	    paramPtr->transform.size = -1;
@@ -2684,12 +2691,10 @@ ForwardProc(
 	    }
 	}
 	break;
-    }
 
-    case ForwardedClear: {
+    case ForwardedClear:
 	(void) InvokeTclMethod(rtPtr, "clear", NULL, NULL, NULL);
 	break;
-    }
 
     case ForwardedLimit:
 	if (InvokeTclMethod(rtPtr, "limit?", NULL, NULL, &resObj) != TCL_OK) {
@@ -2795,7 +2800,7 @@ ForwardSetObjError(
     ForwardSetDynamicError(paramPtr, ckalloc(len));
     memcpy(paramPtr->base.msgStr, msgStr, (unsigned) len);
 }
-#endif
+#endif /* TCL_THREADS */
 
 /*
  *----------------------------------------------------------------------
@@ -3092,7 +3097,7 @@ TransformRead(
 	ckfree(p.transform.buf);
 	return 1;
     }
-#endif
+#endif /* TCL_THREADS */
 
     /* ASSERT: rtPtr->method & FLAG(METH_READ) */
     /* ASSERT: rtPtr->mode & TCL_READABLE */
@@ -3153,7 +3158,7 @@ TransformWrite(
 		p.transform.size);
 	ckfree(p.transform.buf);
     } else
-#endif
+#endif /* TCL_THREADS */
     {
 	/* ASSERT: rtPtr->method & FLAG(METH_WRITE) */
 	/* ASSERT: rtPtr->mode & TCL_WRITABLE */
@@ -3215,7 +3220,7 @@ TransformDrain(
 	ResultAdd(&rtPtr->result, UCHARP(p.transform.buf), p.transform.size);
 	ckfree(p.transform.buf);
     } else
-#endif
+#endif /* TCL_THREADS */
     {
 	if (InvokeTclMethod(rtPtr, "drain", NULL, NULL, &resObj)!=TCL_OK) {
 	    Tcl_SetChannelError(rtPtr->chan, resObj);
@@ -3270,7 +3275,7 @@ TransformFlush(
 	}
 	ckfree(p.transform.buf);
     } else
-#endif
+#endif /* TCL_THREADS */
     {
 	if (InvokeTclMethod(rtPtr, "flush", NULL, NULL, &resObj)!=TCL_OK) {
 	    Tcl_SetChannelError(rtPtr->chan, resObj);
@@ -3311,7 +3316,7 @@ TransformClear(
 	ForwardOpToOwnerThread(rtPtr, ForwardedClear, &p);
 	return;
     }
-#endif
+#endif /* TCL_THREADS */
 
     /* ASSERT: rtPtr->method & FLAG(METH_READ) */
     /* ASSERT: rtPtr->mode & TCL_READABLE */
diff --git a/generic/tclIOSock.c b/generic/tclIOSock.c
index 018f9f5..694501f 100644
--- a/generic/tclIOSock.c
+++ b/generic/tclIOSock.c
@@ -64,8 +64,8 @@ TclSockGetPort(
 	return TCL_ERROR;
     }
     if (*portPtr > 0xFFFF) {
-	Tcl_AppendResult(interp, "couldn't open socket: port number too high",
-		NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"couldn't open socket: port number too high", -1));
 	return TCL_ERROR;
     }
     return TCL_OK;
@@ -100,16 +100,20 @@ TclSockMinimumBuffers(
     socklen_t len;
 
     len = sizeof(int);
-    getsockopt((SOCKET)(size_t)sock, SOL_SOCKET, SO_SNDBUF, (char *)&current, &len);
+    getsockopt((SOCKET)(size_t) sock, SOL_SOCKET, SO_SNDBUF,
+	    (char *) &current, &len);
     if (current < size) {
 	len = sizeof(int);
-	setsockopt((SOCKET)(size_t)sock, SOL_SOCKET, SO_SNDBUF, (char *)&size, len);
+	setsockopt((SOCKET)(size_t) sock, SOL_SOCKET, SO_SNDBUF,
+		(char *) &size, len);
     }
     len = sizeof(int);
-    getsockopt((SOCKET)(size_t)sock, SOL_SOCKET, SO_RCVBUF, (char *)&current, &len);
+    getsockopt((SOCKET)(size_t) sock, SOL_SOCKET, SO_RCVBUF,
+		(char *) &current, &len);
     if (current < size) {
 	len = sizeof(int);
-	setsockopt((SOCKET)(size_t)sock, SOL_SOCKET, SO_RCVBUF, (char *)&size, len);
+	setsockopt((SOCKET)(size_t) sock, SOL_SOCKET, SO_RCVBUF,
+		(char *) &size, len);
     }
     return TCL_OK;
 }
@@ -147,24 +151,34 @@ TclCreateSocketAddress(
     struct addrinfo *p;
     struct addrinfo *v4head = NULL, *v4ptr = NULL;
     struct addrinfo *v6head = NULL, *v6ptr = NULL;
-    char *native = NULL, portstring[TCL_INTEGER_SPACE];
+    char *native = NULL, portbuf[TCL_INTEGER_SPACE], *portstring;
     const char *family = NULL;
     Tcl_DString ds;
     int result, i;
 
-    TclFormatInt(portstring, port);
-
     if (host != NULL) {
 	native = Tcl_UtfToExternalDString(NULL, host, -1, &ds);
     }
+
+    /*
+     * Workaround for OSX's apparent inability to resolve "localhost", "0"
+     * when the loopback device is the only available network interface.
+     */
+    if (host != NULL && port == 0) {
+        portstring = NULL;
+    } else {
+        TclFormatInt(portbuf, port);
+        portstring = portbuf;
+    }
     
     (void) memset(&hints, 0, sizeof(hints));
-    
     hints.ai_family = AF_UNSPEC;
+
     /* 
      * Magic variable to enforce a certain address family - to be superseded
      * by a TIP that adds explicit switches to [socket]
      */
+
     if (interp != NULL) {
         family = Tcl_GetVar(interp, "::tcl::unsupported::socketAF", 0);
         if (family != NULL) {
@@ -182,7 +196,7 @@ TclCreateSocketAddress(
     /*
      * We found some problems when using AI_ADDRCONFIG, e.g. on systems that
      * have no networking besides the loopback interface and want to resolve
-     * localhost. See bugs 3385024, 3382419, 3382431. As the advantage of
+     * localhost. See [Bugs 3385024, 3382419, 3382431]. As the advantage of
      * using AI_ADDRCONFIG in situations where it works, is probably low,
      * we'll leave it out for now. After all, it is just an optimisation.
      *
@@ -206,12 +220,11 @@ TclCreateSocketAddress(
     }
 
     if (result != 0) {
-#ifdef EAI_SYSTEM /* Doesn't exist on Windows */
-        if (result == EAI_SYSTEM)
-            *errorMsgPtr = Tcl_PosixError(interp);
-        else
-#endif
-            *errorMsgPtr = gai_strerror(result);
+	*errorMsgPtr =
+#ifdef EAI_SYSTEM	/* Doesn't exist on Windows */
+		(result == EAI_SYSTEM) ? Tcl_PosixError(interp) :
+#endif /* EAI_SYSTEM */
+		gai_strerror(result);
         return 0;
     }
 
diff --git a/generic/tclIOUtil.c b/generic/tclIOUtil.c
index ebf34dc..2d6d898 100644
--- a/generic/tclIOUtil.c
+++ b/generic/tclIOUtil.c
@@ -460,6 +460,7 @@ FsThrExitProc(
 	ckfree(fsRecPtr);
 	fsRecPtr = tmpFsRecPtr;
     }
+    tsdPtr->filesystemList = NULL;
     tsdPtr->initialized = 0;
 }
 
@@ -647,23 +648,26 @@ TclFSEpochOk(
 }
 
 static void
-Claim()
+Claim(void)
 {
     ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey);
+
     tsdPtr->claims++;
 }
 
 static void
-Disclaim()
+Disclaim(void)
 {
     ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey);
+
     tsdPtr->claims--;
 }
 
 int
-TclFSEpoch()
+TclFSEpoch(void)
 {
     ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey);
+
     return tsdPtr->filesystemEpoch;
 }
 
@@ -1573,8 +1577,8 @@ TclGetOpenModeEx(
 	*seekFlagPtr = 0;
 	*binaryPtr = 0;
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "illegal access mode \"", modeString,
-		    "\"", NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "illegal access mode \"%s\"", modeString));
 	}
 	return -1;
     }
@@ -1623,8 +1627,9 @@ TclGetOpenModeEx(
 	    mode |= O_NOCTTY;
 #else
 	    if (interp != NULL) {
-		Tcl_AppendResult(interp, "access mode \"", flag,
-			"\" not supported by this system", NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"access mode \"%s\" not supported by this system",
+			flag));
 	    }
 	    ckfree(modeArgv);
 	    return -1;
@@ -1635,8 +1640,9 @@ TclGetOpenModeEx(
 	    mode |= O_NONBLOCK;
 #else
 	    if (interp != NULL) {
-		Tcl_AppendResult(interp, "access mode \"", flag,
-			"\" not supported by this system", NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"access mode \"%s\" not supported by this system",
+			flag));
 	    }
 	    ckfree(modeArgv);
 	    return -1;
@@ -1649,9 +1655,10 @@ TclGetOpenModeEx(
 	} else {
 
 	    if (interp != NULL) {
-		Tcl_AppendResult(interp, "invalid access mode \"", flag,
-			"\": must be RDONLY, WRONLY, RDWR, APPEND, BINARY, "
-			"CREAT, EXCL, NOCTTY, NONBLOCK, or TRUNC", NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"invalid access mode \"%s\": must be RDONLY, WRONLY, "
+			"RDWR, APPEND, BINARY, CREAT, EXCL, NOCTTY, NONBLOCK,"
+			" or TRUNC", flag));
 	    }
 	    ckfree(modeArgv);
 	    return -1;
@@ -1662,8 +1669,9 @@ TclGetOpenModeEx(
 
     if (!gotRW) {
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "access mode must include either"
-		    " RDONLY, WRONLY, or RDWR", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "access mode must include either RDONLY, WRONLY, or RDWR",
+		    -1));
 	}
 	return -1;
     }
@@ -1722,15 +1730,16 @@ Tcl_FSEvalFileEx(
 
     if (Tcl_FSStat(pathPtr, &statBuf) == -1) {
 	Tcl_SetErrno(errno);
-	Tcl_AppendResult(interp, "couldn't read file \"",
-		Tcl_GetString(pathPtr), "\": ", Tcl_PosixError(interp), NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't read file \"%s\": %s",
+		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
 	return result;
     }
     chan = Tcl_FSOpenFileChannel(interp, pathPtr, "r", 0644);
     if (chan == NULL) {
-	Tcl_ResetResult(interp);
-	Tcl_AppendResult(interp, "couldn't read file \"",
-		Tcl_GetString(pathPtr), "\": ", Tcl_PosixError(interp), NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't read file \"%s\": %s",
+		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
 	return result;
     }
 
@@ -1764,8 +1773,9 @@ Tcl_FSEvalFileEx(
 
     if (Tcl_ReadChars(chan, objPtr, 1, 0) < 0) {
 	Tcl_Close(interp, chan);
-	Tcl_AppendResult(interp, "couldn't read file \"",
-		Tcl_GetString(pathPtr), "\": ", Tcl_PosixError(interp), NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't read file \"%s\": %s",
+		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
 	goto end;
     }
     string = Tcl_GetString(objPtr);
@@ -1778,8 +1788,9 @@ Tcl_FSEvalFileEx(
     if (Tcl_ReadChars(chan, objPtr, -1,
 	    memcmp(string, "\xef\xbb\xbf", 3)) < 0) {
 	Tcl_Close(interp, chan);
-	Tcl_AppendResult(interp, "couldn't read file \"",
-		Tcl_GetString(pathPtr), "\": ", Tcl_PosixError(interp), NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't read file \"%s\": %s",
+		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
 	goto end;
     }
 
@@ -1853,15 +1864,16 @@ TclNREvalFile(
 
     if (Tcl_FSStat(pathPtr, &statBuf) == -1) {
 	Tcl_SetErrno(errno);
-	Tcl_AppendResult(interp, "couldn't read file \"",
-		Tcl_GetString(pathPtr), "\": ", Tcl_PosixError(interp), NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't read file \"%s\": %s",
+		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
 	return TCL_ERROR;
     }
     chan = Tcl_FSOpenFileChannel(interp, pathPtr, "r", 0644);
     if (chan == NULL) {
-	Tcl_ResetResult(interp);
-	Tcl_AppendResult(interp, "couldn't read file \"",
-		Tcl_GetString(pathPtr), "\": ", Tcl_PosixError(interp), NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't read file \"%s\": %s",
+		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
 	return TCL_ERROR;
     }
 
@@ -1895,8 +1907,9 @@ TclNREvalFile(
 
     if (Tcl_ReadChars(chan, objPtr, 1, 0) < 0) {
 	Tcl_Close(interp, chan);
-	Tcl_AppendResult(interp, "couldn't read file \"",
-		Tcl_GetString(pathPtr), "\": ", Tcl_PosixError(interp), NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't read file \"%s\": %s",
+		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
 	Tcl_DecrRefCount(objPtr);
 	return TCL_ERROR;
     }
@@ -1910,8 +1923,9 @@ TclNREvalFile(
     if (Tcl_ReadChars(chan, objPtr, -1,
 	    memcmp(string, "\xef\xbb\xbf", 3)) < 0) {
 	Tcl_Close(interp, chan);
-	Tcl_AppendResult(interp, "couldn't read file \"",
-		Tcl_GetString(pathPtr), "\": ", Tcl_PosixError(interp), NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't read file \"%s\": %s",
+		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
 	Tcl_DecrRefCount(objPtr);
 	return TCL_ERROR;
     }
@@ -2247,9 +2261,9 @@ Tcl_FSOpenFileChannel(
 	if (seekFlag && Tcl_Seek(retVal, (Tcl_WideInt) 0, SEEK_END)
 		< (Tcl_WideInt) 0) {
 	    if (interp != NULL) {
-		Tcl_AppendResult(interp, "could not seek to end of file "
-			"while opening \"", Tcl_GetString(pathPtr), "\": ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"could not seek to end of file while opening \"%s\": %s",
+			Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
 	    }
 	    Tcl_Close(NULL, retVal);
 	    return NULL;
@@ -2266,8 +2280,9 @@ Tcl_FSOpenFileChannel(
 
     Tcl_SetErrno(ENOENT);
     if (interp != NULL) {
-	Tcl_AppendResult(interp, "couldn't open \"", Tcl_GetString(pathPtr),
-		"\": ", Tcl_PosixError(interp), NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't open \"%s\": %s",
+		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
     }
     return NULL;
 }
@@ -2685,9 +2700,9 @@ Tcl_FSGetCwd(
 		Disclaim();
 		goto cdDidNotChange;
 	    } else if (interp != NULL) {
-		Tcl_AppendResult(interp,
-			"error getting working directory name: ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"error getting working directory name: %s",
+			Tcl_PosixError(interp)));
 	    }
 	}
 	Disclaim();
@@ -2761,9 +2776,9 @@ Tcl_FSGetCwd(
 
 	    retCd = proc2(tsdPtr->cwdClientData);
 	    if (retCd == NULL && interp != NULL) {
-		Tcl_AppendResult(interp,
-			"error getting working directory name: ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"error getting working directory name: %s",
+			Tcl_PosixError(interp)));
 	    }
 
 	    if (retCd == tsdPtr->cwdClientData) {
@@ -3153,8 +3168,9 @@ Tcl_LoadFile(
      */
 
     if (Tcl_FSAccess(pathPtr, R_OK) != 0) {
-	Tcl_AppendResult(interp, "couldn't load library \"",
-		Tcl_GetString(pathPtr), "\": ", Tcl_PosixError(interp), NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't load library \"%s\": %s",
+		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
 	return TCL_ERROR;
     }
 
@@ -3204,7 +3220,7 @@ Tcl_LoadFile(
 
   mustCopyToTempAnyway:
     Tcl_ResetResult(interp);
-#endif
+#endif /* TCL_LOAD_FROM_MEMORY */
 
     /*
      * Get a temporary filename to use, first to copy the file into, and then
@@ -3224,8 +3240,8 @@ Tcl_LoadFile(
 
 	Tcl_FSDeleteFile(copyToPtr);
 	Tcl_DecrRefCount(copyToPtr);
-	Tcl_AppendResult(interp, "couldn't load from current filesystem",
-		NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"couldn't load from current filesystem", -1));
 	return TCL_ERROR;
     }
 
diff --git a/generic/tclInt.h b/generic/tclInt.h
index 92aed38..0b84914 100644
--- a/generic/tclInt.h
+++ b/generic/tclInt.h
@@ -801,13 +801,17 @@ typedef struct VarInHash {
 #define TclSetVarNamespaceVar(varPtr) \
     if (!TclIsVarNamespaceVar(varPtr)) {\
 	(varPtr)->flags |= VAR_NAMESPACE_VAR;\
-	((VarInHash *)(varPtr))->refCount++;\
+	if (TclIsVarInHash(varPtr)) {\
+	    ((VarInHash *)(varPtr))->refCount++;\
+	}\
     }
 
 #define TclClearVarNamespaceVar(varPtr) \
     if (TclIsVarNamespaceVar(varPtr)) {\
 	(varPtr)->flags &= ~VAR_NAMESPACE_VAR;\
-	((VarInHash *)(varPtr))->refCount--;\
+	if (TclIsVarInHash(varPtr)) {\
+	    ((VarInHash *)(varPtr))->refCount--;\
+	}\
     }
 
 /*
@@ -2483,6 +2487,14 @@ typedef struct List {
     (((listPtr)->typePtr == &tclListType) ? ListObjIsCanonical((listPtr)) : 0)
 
 /*
+ * Modes for collecting (or not) in the implementations of TclNRForeachCmd,
+ * TclNRLmapCmd and their compilations.
+ */
+
+#define TCL_EACH_KEEP_NONE  0	/* Discard iteration result like [foreach] */
+#define TCL_EACH_COLLECT    1	/* Collect iteration result like [lmap] */
+
+/*
  * Macros providing a faster path to integers: Tcl_GetLongFromObj everywhere,
  * Tcl_GetIntFromObj and TclGetIntForIndex on platforms where longs are ints.
  *
@@ -2774,6 +2786,7 @@ MODULE_SCOPE Tcl_ObjCmdProc TclNRExprObjCmd;
 MODULE_SCOPE Tcl_ObjCmdProc TclNRForObjCmd;
 MODULE_SCOPE Tcl_ObjCmdProc TclNRForeachCmd;
 MODULE_SCOPE Tcl_ObjCmdProc TclNRIfObjCmd;
+MODULE_SCOPE Tcl_ObjCmdProc TclNRLmapCmd;
 MODULE_SCOPE Tcl_ObjCmdProc TclNRSourceObjCmd;
 MODULE_SCOPE Tcl_ObjCmdProc TclNRSubstObjCmd;
 MODULE_SCOPE Tcl_ObjCmdProc TclNRSwitchObjCmd;
@@ -3342,6 +3355,9 @@ MODULE_SCOPE int	Tcl_LlengthObjCmd(ClientData clientData,
 MODULE_SCOPE int	Tcl_ListObjCmd(ClientData clientData,
 			    Tcl_Interp *interp, int objc,
 			    Tcl_Obj *const objv[]);
+MODULE_SCOPE int	Tcl_LmapObjCmd(ClientData clientData,
+			    Tcl_Interp *interp, int objc,
+			    Tcl_Obj *const objv[]);
 MODULE_SCOPE int	Tcl_LoadObjCmd(ClientData clientData,
 			    Tcl_Interp *interp, int objc,
 			    Tcl_Obj *const objv[]);
@@ -3492,6 +3508,9 @@ MODULE_SCOPE int	TclCompileDictAppendCmd(Tcl_Interp *interp,
 MODULE_SCOPE int	TclCompileDictForCmd(Tcl_Interp *interp,
 			    Tcl_Parse *parsePtr, Command *cmdPtr,
 			    struct CompileEnv *envPtr);
+MODULE_SCOPE int	TclCompileDictMapCmd(Tcl_Interp *interp,
+			    Tcl_Parse *parsePtr, Command *cmdPtr,
+			    struct CompileEnv *envPtr);
 MODULE_SCOPE int	TclCompileDictGetCmd(Tcl_Interp *interp,
 			    Tcl_Parse *parsePtr, Command *cmdPtr,
 			    struct CompileEnv *envPtr);
@@ -3558,6 +3577,9 @@ MODULE_SCOPE int	TclCompileListCmd(Tcl_Interp *interp,
 MODULE_SCOPE int	TclCompileLlengthCmd(Tcl_Interp *interp,
 			    Tcl_Parse *parsePtr, Command *cmdPtr,
 			    struct CompileEnv *envPtr);
+MODULE_SCOPE int	TclCompileLmapCmd(Tcl_Interp *interp,
+			    Tcl_Parse *parsePtr, Command *cmdPtr,
+			    struct CompileEnv *envPtr);
 MODULE_SCOPE int	TclCompileLrangeCmd(Tcl_Interp *interp,
 			    Tcl_Parse *parsePtr, Command *cmdPtr,
 			    struct CompileEnv *envPtr);
diff --git a/generic/tclIntPlatDecls.h b/generic/tclIntPlatDecls.h
index 7322a37..36cb918 100644
--- a/generic/tclIntPlatDecls.h
+++ b/generic/tclIntPlatDecls.h
@@ -525,7 +525,10 @@ extern const TclIntPlatStubs *tclIntPlatStubsPtr;
 #undef TclWinConvertWSAError
 #define TclWinConvertWSAError TclWinConvertError
 
-#if !defined(__WIN32__) && !defined(__CYGWIN__)
+#if defined(__WIN32__) || defined(__CYGWIN__)
+#   undef TclWinNToHS
+#   define TclWinNToHS ntohs
+#else
 #   undef TclpGetPid
 #   define TclpGetPid(pid) ((unsigned long) (pid))
 #endif
diff --git a/generic/tclMain.c b/generic/tclMain.c
index 88b4e51..f445383 100644
--- a/generic/tclMain.c
+++ b/generic/tclMain.c
@@ -16,11 +16,12 @@
  * this file, and for a DISCLAIMER OF ALL WARRANTIES.
  */
 
-/**
- * On Windows, this file needs to be compiled twice, once with
- * TCL_ASCII_MAIN defined. This way both Tcl_Main and Tcl_MainExW
- * can be implemented, sharing the same source code.
+/*
+ * On Windows, this file needs to be compiled twice, once with TCL_ASCII_MAIN
+ * defined. This way both Tcl_Main and Tcl_MainExW can be implemented, sharing
+ * the same source code.
  */
+
 #if defined(TCL_ASCII_MAIN)
 #   ifdef UNICODE
 #	undef UNICODE
@@ -40,12 +41,12 @@
 #define DEFAULT_PRIMARY_PROMPT	"% "
 
 /*
- * This file can be compiled on Windows in UNICODE mode, as well as
- * on all other platforms using the native encoding. This is done
- * by using the normal Windows functions like _tcscmp, but on
- * platforms which don't have <tchar.h> we have to translate that
- * to strcmp here.
+ * This file can be compiled on Windows in UNICODE mode, as well as on all
+ * other platforms using the native encoding. This is done by using the normal
+ * Windows functions like _tcscmp, but on platforms which don't have <tchar.h>
+ * we have to translate that to strcmp here.
  */
+
 #ifndef __WIN32__
 #   define TCHAR char
 #   define TEXT(arg) arg
@@ -128,10 +129,11 @@ typedef struct InteractiveState {
 MODULE_SCOPE Tcl_MainLoopProc *TclGetMainLoop(void);
 static void		Prompt(Tcl_Interp *interp, InteractiveState *isPtr);
 static void		StdinProc(ClientData clientData, int mask);
-static void     FreeMainInterp(ClientData clientData);
+static void		FreeMainInterp(ClientData clientData);
 
 #ifndef TCL_ASCII_MAIN
 static Tcl_ThreadDataKey dataKey;
+
 /*
  *----------------------------------------------------------------------
  *
@@ -332,13 +334,14 @@ Tcl_MainEx(
 	 */
 
 	if ((argc > 3) && (0 == _tcscmp(TEXT("-encoding"), argv[1]))
-		&& (TEXT('-') != argv[3][0])) {
-		Tcl_Obj *value = NewNativeObj(argv[2], -1);
-	    Tcl_SetStartupScript(NewNativeObj(argv[3], -1), Tcl_GetString(value));
+		&& ('-' != argv[3][0])) {
+	    Tcl_Obj *value = NewNativeObj(argv[2], -1);
+	    Tcl_SetStartupScript(NewNativeObj(argv[3], -1),
+		    Tcl_GetString(value));
 	    Tcl_DecrRefCount(value);
 	    argc -= 3;
 	    argv += 3;
-	} else if ((argc > 1) && (TEXT('-') != argv[1][0])) {
+	} else if ((argc > 1) && ('-' != argv[1][0])) {
 	    Tcl_SetStartupScript(NewNativeObj(argv[1], -1), NULL);
 	    argc--;
 	    argv++;
@@ -395,8 +398,9 @@ Tcl_MainEx(
 	/*
 	 * Arrange for final deletion of the main interp
 	 */
-	/* ARGH Munchhausen effect  */
-	Tcl_CreateExitHandler(FreeMainInterp, (ClientData)interp);
+
+	/* ARGH Munchhausen effect */
+	Tcl_CreateExitHandler(FreeMainInterp, interp);
     }
 
     /*
@@ -458,6 +462,7 @@ Tcl_MainEx(
 	mainLoopProc = TclGetMainLoop();
 	if (mainLoopProc == NULL) {
 	    int length;
+
 	    if (is.tty) {
 		Prompt(interp, &is);
 		if (Tcl_InterpDeleted(interp)) {
@@ -523,7 +528,8 @@ Tcl_MainEx(
 
 	    Tcl_GetStringFromObj(is.commandPtr, &length);
 	    Tcl_SetObjLength(is.commandPtr, --length);
-	    code = Tcl_RecordAndEvalObj(interp, is.commandPtr, TCL_EVAL_GLOBAL);
+	    code = Tcl_RecordAndEvalObj(interp, is.commandPtr,
+		    TCL_EVAL_GLOBAL);
 	    is.input = Tcl_GetStdChannel(TCL_STDIN);
 	    Tcl_DecrRefCount(is.commandPtr);
 	    is.commandPtr = Tcl_NewObj();
@@ -557,7 +563,8 @@ Tcl_MainEx(
 		    Prompt(interp, &is);
 		}
 
-		Tcl_CreateChannelHandler(is.input, TCL_READABLE, StdinProc, &is);
+		Tcl_CreateChannelHandler(is.input, TCL_READABLE,
+			StdinProc, &is);
 	    }
 
 	    mainLoopProc();
@@ -568,24 +575,23 @@ Tcl_MainEx(
 	    }
 	    is.input = Tcl_GetStdChannel(TCL_STDIN);
 	}
-#ifdef TCL_MEM_DEBUG
 
 	/*
 	 * This code here only for the (unsupported and deprecated) [checkmem]
 	 * command.
 	 */
 
+#ifdef TCL_MEM_DEBUG
 	if (tclMemDumpFileName != NULL) {
 	    Tcl_SetMainLoop(NULL);
 	    Tcl_DeleteInterp(interp);
 	}
-#endif
+#endif /* TCL_MEM_DEBUG */
     }
 
   done:
     mainLoopProc = TclGetMainLoop();
-    if ((exitCode == 0) && (mainLoopProc != NULL)
-	    && !Tcl_LimitExceeded(interp)) {
+    if ((exitCode == 0) && mainLoopProc && !Tcl_LimitExceeded(interp)) {
 	/*
 	 * If everything has gone OK so far, call the main loop proc, if it
 	 * exists. Packages (like Tk) can set it to start processing events at
@@ -605,21 +611,21 @@ Tcl_MainEx(
      * exit. The Tcl_EvalObjEx call should never return.
      */
 
-    if (!Tcl_InterpDeleted(interp)) {
-	if (!Tcl_LimitExceeded(interp)) {
-	    Tcl_Obj *cmd = Tcl_ObjPrintf("exit %d", exitCode);
+    if (!Tcl_InterpDeleted(interp) && !Tcl_LimitExceeded(interp)) {
+	Tcl_Obj *cmd = Tcl_ObjPrintf("exit %d", exitCode);
 	    
-	    Tcl_IncrRefCount(cmd);
-	    Tcl_EvalObjEx(interp, cmd, TCL_EVAL_GLOBAL);
-	    Tcl_DecrRefCount(cmd);
-	}
+	Tcl_IncrRefCount(cmd);
+	Tcl_EvalObjEx(interp, cmd, TCL_EVAL_GLOBAL);
+	Tcl_DecrRefCount(cmd);
     }
-	/*
-	 * If Tcl_EvalObjEx returns, trying to eval [exit], something unusual
-	 * is happening. Maybe interp has been deleted; maybe [exit] was
-	 * redefined, maybe we've blown up because of an exceeded limit. We
-	 * still want to cleanup and exit.
-	 */
+
+    /*
+     * If Tcl_EvalObjEx returns, trying to eval [exit], something unusual is
+     * happening. Maybe interp has been deleted; maybe [exit] was redefined,
+     * maybe we've blown up because of an exceeded limit. We still want to
+     * cleanup and exit.
+     */
+
     Tcl_Exit(exitCode);
 }
 
@@ -637,7 +643,7 @@ Tcl_Main(
     Tcl_FindExecutable(argv[0]);
     Tcl_MainEx(argc, argv, appInitProc, Tcl_CreateInterp());
 }
-#endif
+#endif /* TCL_MAJOR_VERSION == 8 && !UNICODE */
 
 #ifndef TCL_ASCII_MAIN
 
@@ -711,6 +717,7 @@ TclGetMainLoop(void)
  *
  *----------------------------------------------------------------------
  */
+
 MODULE_SCOPE int
 TclFullFinalizationRequested(void)
 {
@@ -727,7 +734,7 @@ TclFullFinalizationRequested(void)
 	Tcl_DStringFree(&ds);
     }
     return finalize;
-#endif
+#endif /* PURIFY */
 }
 #endif /* !TCL_ASCII_MAIN */
 
@@ -866,9 +873,8 @@ StdinProc(
 static void
 Prompt(
     Tcl_Interp *interp,		/* Interpreter to use for prompting. */
-    InteractiveState *isPtr) /* InteractiveState. Filled
-				 * with PROMPT_NONE after a prompt is
-				 * printed. */
+    InteractiveState *isPtr)	/* InteractiveState. Filled with PROMPT_NONE
+				 * after a prompt is printed. */
 {
     Tcl_Obj *promptCmdPtr;
     int code;
@@ -879,7 +885,7 @@ Prompt(
     }
 
     promptCmdPtr = Tcl_GetVar2Ex(interp,
-	    ((isPtr->prompt == PROMPT_CONTINUE) ? "tcl_prompt2" : "tcl_prompt1"),
+	    (isPtr->prompt==PROMPT_CONTINUE ? "tcl_prompt2" : "tcl_prompt1"),
 	    NULL, TCL_GLOBAL_ONLY);
 
     if (Tcl_InterpDeleted(interp)) {
@@ -920,8 +926,8 @@ Prompt(
  *
  * FreeMainInterp --
  *
- *	Exit handler used to cleanup the main interpreter and ancillary startup
- *	script storage at exit.
+ *	Exit handler used to cleanup the main interpreter and ancillary
+ *	startup script storage at exit.
  *
  *----------------------------------------------------------------------
  */
@@ -930,13 +936,13 @@ static void
 FreeMainInterp(
     ClientData clientData)
 {
-	Tcl_Interp *interp = (Tcl_Interp *) clientData;
+    Tcl_Interp *interp = clientData;
 
-	/*if (TclInExit()) return;*/
+    /*if (TclInExit()) return;*/
 
-	if (!Tcl_InterpDeleted(interp)) {
-	    Tcl_DeleteInterp(interp);
-	}
+    if (!Tcl_InterpDeleted(interp)) {
+	Tcl_DeleteInterp(interp);
+    }
     Tcl_SetStartupScript(NULL, NULL);
     Tcl_Release(interp);
 }
diff --git a/generic/tclOO.c b/generic/tclOO.c
index d9f5d60..04a2bf7 100644
--- a/generic/tclOO.c
+++ b/generic/tclOO.c
@@ -3,7 +3,7 @@
  *
  *	This file contains the object-system core (NB: not Tcl_Obj, but ::oo)
  *
- * Copyright (c) 2005-2011 by Donal K. Fellows
+ * Copyright (c) 2005-2012 by Donal K. Fellows
  *
  * See the file "license.terms" for information on usage and redistribution of
  * this file, and for a DISCLAIMER OF ALL WARRANTIES.
diff --git a/generic/tclOO.h b/generic/tclOO.h
index fef2bd0..280481c 100644
--- a/generic/tclOO.h
+++ b/generic/tclOO.h
@@ -4,7 +4,7 @@
  *	This file contains the public API definitions and some of the function
  *	declarations for the object-system (NB: not Tcl_Obj, but ::oo).
  *
- * Copyright (c) 2006-2008 by Donal K. Fellows
+ * Copyright (c) 2006-2010 by Donal K. Fellows
  *
  * See the file "license.terms" for information on usage and redistribution of
  * this file, and for a DISCLAIMER OF ALL WARRANTIES.
@@ -34,11 +34,12 @@ extern const char *TclOOInitializeStubs(
  * version in the files:
  *
  * tests/oo.test
+ * tests/ooNext2.test
  * unix/tclooConfig.sh
  * win/tclooConfig.sh
  */
 
-#define TCLOO_VERSION "0.6.3"
+#define TCLOO_VERSION "0.7"
 #define TCLOO_PATCHLEVEL TCLOO_VERSION
 
 /*
diff --git a/generic/tclOOBasic.c b/generic/tclOOBasic.c
index 3637ede..0676618 100644
--- a/generic/tclOOBasic.c
+++ b/generic/tclOOBasic.c
@@ -4,7 +4,7 @@
  *	This file contains implementations of the "simple" commands and
  *	methods from the object-system core.
  *
- * Copyright (c) 2005-2011 by Donal K. Fellows
+ * Copyright (c) 2005-2012 by Donal K. Fellows
  *
  * See the file "license.terms" for information on usage and redistribution of
  * this file, and for a DISCLAIMER OF ALL WARRANTIES.
diff --git a/generic/tclOOCall.c b/generic/tclOOCall.c
index 760bd7b..a79e4fa 100644
--- a/generic/tclOOCall.c
+++ b/generic/tclOOCall.c
@@ -4,7 +4,7 @@
  *	This file contains the method call chain management code for the
  *	object-system core.
  *
- * Copyright (c) 2005-2011 by Donal K. Fellows
+ * Copyright (c) 2005-2012 by Donal K. Fellows
  *
  * See the file "license.terms" for information on usage and redistribution of
  * this file, and for a DISCLAIMER OF ALL WARRANTIES.
diff --git a/generic/tclOODefineCmds.c b/generic/tclOODefineCmds.c
index c022e6b..bacab38 100644
--- a/generic/tclOODefineCmds.c
+++ b/generic/tclOODefineCmds.c
@@ -4,7 +4,7 @@
  *	This file contains the implementation of the ::oo::define command,
  *	part of the object-system core (NB: not Tcl_Obj, but ::oo).
  *
- * Copyright (c) 2006-2008 by Donal K. Fellows
+ * Copyright (c) 2006-2012 by Donal K. Fellows
  *
  * See the file "license.terms" for information on usage and redistribution of
  * this file, and for a DISCLAIMER OF ALL WARRANTIES.
diff --git a/generic/tclOOInfo.c b/generic/tclOOInfo.c
index 796442b..1a94e69 100644
--- a/generic/tclOOInfo.c
+++ b/generic/tclOOInfo.c
@@ -4,7 +4,7 @@
  *	This file contains the implementation of the ::oo-related [info]
  *	subcommands.
  *
- * Copyright (c) 2006-2008 by Donal K. Fellows
+ * Copyright (c) 2006-2011 by Donal K. Fellows
  *
  * See the file "license.terms" for information on usage and redistribution of
  * this file, and for a DISCLAIMER OF ALL WARRANTIES.
diff --git a/generic/tclOOInt.h b/generic/tclOOInt.h
index 631961f..ab54964 100644
--- a/generic/tclOOInt.h
+++ b/generic/tclOOInt.h
@@ -4,7 +4,7 @@
  *	This file contains the structure definitions and some of the function
  *	declarations for the object-system (NB: not Tcl_Obj, but ::oo).
  *
- * Copyright (c) 2006-2011 by Donal K. Fellows
+ * Copyright (c) 2006-2012 by Donal K. Fellows
  *
  * See the file "license.terms" for information on usage and redistribution of
  * this file, and for a DISCLAIMER OF ALL WARRANTIES.
diff --git a/generic/tclOOMethod.c b/generic/tclOOMethod.c
index 60eaa6e..28820e0 100644
--- a/generic/tclOOMethod.c
+++ b/generic/tclOOMethod.c
@@ -3,7 +3,7 @@
  *
  *	This file contains code to create and manage methods.
  *
- * Copyright (c) 2005-2008 by Donal K. Fellows
+ * Copyright (c) 2005-2011 by Donal K. Fellows
  *
  * See the file "license.terms" for information on usage and redistribution of
  * this file, and for a DISCLAIMER OF ALL WARRANTIES.
diff --git a/generic/tclPathObj.c b/generic/tclPathObj.c
index db07c0e..2b9ff87 100644
--- a/generic/tclPathObj.c
+++ b/generic/tclPathObj.c
@@ -1764,7 +1764,7 @@ Tcl_FSGetNormalizedPath(
 	 */
 
 	Tcl_Obj *dir, *copy;
-	int cwdLen, pathType;
+	int tailLen, cwdLen, pathType;
 
 	pathType = Tcl_FSGetPathType(fsPathPtr->cwdPtr);
 	dir = Tcl_FSGetNormalizedPath(interp, fsPathPtr->cwdPtr);
@@ -1776,7 +1776,12 @@ Tcl_FSGetNormalizedPath(
 	    UpdateStringOfFsPath(pathPtr);
 	}
 
-	copy = AppendPath(dir, fsPathPtr->normPathPtr);
+	Tcl_GetStringFromObj(fsPathPtr->normPathPtr, &tailLen);
+	if (tailLen) {
+	    copy = AppendPath(dir, fsPathPtr->normPathPtr);
+	} else {
+	    copy = Tcl_DuplicateObj(dir);
+	}
 	Tcl_IncrRefCount(dir);
 	Tcl_IncrRefCount(copy);
 
diff --git a/generic/tclResult.c b/generic/tclResult.c
index 17aac74..9707f20 100644
--- a/generic/tclResult.c
+++ b/generic/tclResult.c
@@ -380,12 +380,10 @@ Tcl_DiscardResult(
 
     if (statePtr->result == statePtr->appendResult) {
 	ckfree(statePtr->appendResult);
+    } else if (statePtr->freeProc == TCL_DYNAMIC) {
+        ckfree(statePtr->result);
     } else if (statePtr->freeProc) {
-	if (statePtr->freeProc == TCL_DYNAMIC) {
-	    ckfree(statePtr->result);
-	} else {
-	    statePtr->freeProc(statePtr->result);
-	}
+        statePtr->freeProc(statePtr->result);
     }
 }
 
@@ -585,7 +583,7 @@ Tcl_GetObjResult(
      * result, then reset the string result.
      */
 
-    if (*(iPtr->result) != 0) {
+    if (iPtr->result[0] != 0) {
 	ResetObjResult(iPtr);
 
 	objResultPtr = iPtr->objResultPtr;
@@ -601,7 +599,7 @@ Tcl_GetObjResult(
 	    iPtr->freeProc = 0;
 	}
 	iPtr->result = iPtr->resultSpace;
-	iPtr->resultSpace[0] = 0;
+	iPtr->result[0] = 0;
     }
     return iPtr->objResultPtr;
 }
@@ -1106,9 +1104,7 @@ Tcl_SetObjErrorCode(
  *
  * Tcl_GetErrorLine --
  *
- * Results:
- *
- * Side effects:
+ *      Returns the line number associated with the current error.
  *
  *----------------------------------------------------------------------
  */
@@ -1125,9 +1121,7 @@ Tcl_GetErrorLine(
  *
  * Tcl_SetErrorLine --
  *
- * Results:
- *
- * Side effects:
+ *      Sets the line number associated with the current error.
  *
  *----------------------------------------------------------------------
  */
@@ -1274,7 +1268,8 @@ TclProcessReturn(
 	    Tcl_DecrRefCount(iPtr->errorInfo);
 	    iPtr->errorInfo = NULL;
 	}
-	Tcl_DictObjGet(NULL, iPtr->returnOpts, keys[KEY_ERRORINFO], &valuePtr);
+	Tcl_DictObjGet(NULL, iPtr->returnOpts, keys[KEY_ERRORINFO],
+                &valuePtr);
 	if (valuePtr != NULL) {
 	    int infoLen;
 
@@ -1285,7 +1280,8 @@ TclProcessReturn(
 		iPtr->flags |= ERR_ALREADY_LOGGED;
 	    }
 	}
-	Tcl_DictObjGet(NULL, iPtr->returnOpts, keys[KEY_ERRORSTACK], &valuePtr);
+	Tcl_DictObjGet(NULL, iPtr->returnOpts, keys[KEY_ERRORSTACK],
+                &valuePtr);
 	if (valuePtr != NULL) {
             int len, valueObjc;
             Tcl_Obj **valueObjv;
@@ -1298,26 +1294,36 @@ TclProcessReturn(
                 Tcl_IncrRefCount(newObj);
                 iPtr->errorStack = newObj;
             }
+
             /*
              * List extraction done after duplication to avoid moving the rug
              * if someone does [return -errorstack [info errorstack]]
              */
-            if (Tcl_ListObjGetElements(interp, valuePtr, &valueObjc, &valueObjv) == TCL_ERROR) {
+
+            if (Tcl_ListObjGetElements(interp, valuePtr, &valueObjc,
+                    &valueObjv) == TCL_ERROR) {
                 return TCL_ERROR;
             }
             iPtr->resetErrorStack = 0;
             Tcl_ListObjLength(interp, iPtr->errorStack, &len);
-            /* reset while keeping the list intrep as much as possible */
-            Tcl_ListObjReplace(interp, iPtr->errorStack, 0, len, valueObjc, valueObjv);
+
+            /*
+             * Reset while keeping the list intrep as much as possible.
+             */
+
+            Tcl_ListObjReplace(interp, iPtr->errorStack, 0, len, valueObjc,
+                    valueObjv);
  	}
-	Tcl_DictObjGet(NULL, iPtr->returnOpts, keys[KEY_ERRORCODE], &valuePtr);
+	Tcl_DictObjGet(NULL, iPtr->returnOpts, keys[KEY_ERRORCODE],
+                &valuePtr);
 	if (valuePtr != NULL) {
 	    Tcl_SetObjErrorCode(interp, valuePtr);
 	} else {
 	    Tcl_SetErrorCode(interp, "NONE", NULL);
 	}
 
-	Tcl_DictObjGet(NULL, iPtr->returnOpts, keys[KEY_ERRORLINE], &valuePtr);
+	Tcl_DictObjGet(NULL, iPtr->returnOpts, keys[KEY_ERRORLINE],
+                &valuePtr);
 	if (valuePtr != NULL) {
 	    TclGetIntFromObj(NULL, valuePtr, &iPtr->errorLine);
 	}
@@ -1421,7 +1427,8 @@ TclMergeReturnOptions(
 
     Tcl_DictObjGet(NULL, returnOpts, keys[KEY_CODE], &valuePtr);
     if (valuePtr != NULL) {
-	if (TCL_ERROR == TclGetCompletionCodeFromObj(interp, valuePtr, &code)) {
+	if (TclGetCompletionCodeFromObj(interp, valuePtr,
+                &code) == TCL_ERROR) {
 	    goto error;
 	}
 	Tcl_DictObjRemove(NULL, returnOpts, keys[KEY_CODE]);
@@ -1599,7 +1606,8 @@ Tcl_GetReturnOptions(
  *
  * TclNoErrorStack --
  *
- *	Removes the -errorstack entry from an options dict to avoid reference cycles
+ *	Removes the -errorstack entry from an options dict to avoid reference
+ *	cycles.
  *
  * Results:
  *	The (unshared) argument options dict, modified in -place.
@@ -1608,12 +1616,13 @@ Tcl_GetReturnOptions(
  */
 
 Tcl_Obj *
-TclNoErrorStack(Tcl_Interp *interp, Tcl_Obj *options)
+TclNoErrorStack(
+    Tcl_Interp *interp,
+    Tcl_Obj *options)
 {
     Tcl_Obj **keys = GetKeys();
     
     Tcl_DictObjRemove(interp, options, keys[KEY_ERRORSTACK]);
-
     return options;
 }
 
diff --git a/generic/tclStubInit.c b/generic/tclStubInit.c
index 87cd4eb..75af3b7 100644
--- a/generic/tclStubInit.c
+++ b/generic/tclStubInit.c
@@ -53,6 +53,15 @@ static int TclSockMinimumBuffersOld(int sock, int size)
 }
 #endif
 
+
+#if defined(_WIN32) || defined(__CYGWIN__)
+#undef TclWinNToHS
+#define TclWinNToHS winNToHS
+static unsigned short TclWinNToHS(unsigned short ns) {
+	return ntohs(ns);
+}
+#endif
+
 #ifdef __WIN32__
 #   define TclUnixWaitForFile 0
 #   define TclUnixCopyFile 0
@@ -89,12 +98,6 @@ void *TclWinGetTclInstance()
     return hInstance;
 }
 
-unsigned short
-TclWinNToHS(unsigned short ns)
-{
-    return ntohs(ns);
-}
-
 int
 TclWinSetSockOpt(SOCKET s, int level, int optname,
 	    const char *optval, int optlen)
@@ -166,14 +169,6 @@ Tcl_WinTCharToUtf(
 	    string, len, dsPtr);
 }
 
-#define TclMacOSXGetFileAttribute (int (*) (Tcl_Interp *,  \
-		int, Tcl_Obj *, Tcl_Obj **)) TclpCreateProcess
-#define TclMacOSXMatchType (int (*) (Tcl_Interp *, const char *, \
-		const char *, Tcl_StatBuf *, Tcl_GlobTypeData *)) TclpMakeFile
-#define TclMacOSXNotifierAddRunLoopMode (void (*) (const void *)) TclpOpenFile
-#define TclpLocaltime_unix (struct tm *(*) (const time_t *)) TclGetAndDetachPids
-#define TclpGmtime_unix (struct tm *(*) (const time_t *)) TclpCloseFile
-
 #else /* UNIX and MAC */
 #   define TclpLocaltime_unix TclpLocaltime
 #   define TclpGmtime_unix TclpGmtime
@@ -1292,6 +1287,7 @@ const TclStubs tclStubs = {
     Tcl_LoadFile, /* 627 */
     Tcl_FindSymbol, /* 628 */
     Tcl_FSUnloadFile, /* 629 */
+    Tcl_ZlibStreamSetCompressionDictionary, /* 630 */
 };
 
 /* !END!: Do not edit above this line. */
diff --git a/generic/tclTest.c b/generic/tclTest.c
index b4192b2..5dc95f9 100644
--- a/generic/tclTest.c
+++ b/generic/tclTest.c
@@ -15,11 +15,6 @@
  * this file, and for a DISCLAIMER OF ALL WARRANTIES.
  */
 
-#ifndef _WIN64
-/* See [Bug 2935503]: file mtime sets wrong time */
-#   define _USE_32BIT_TIME_T
-#endif
-
 #undef STATIC_BUILD
 #ifndef USE_TCL_STUBS
 #   define USE_TCL_STUBS
diff --git a/generic/tclUtil.c b/generic/tclUtil.c
index 6d42080..13e54ec 100644
--- a/generic/tclUtil.c
+++ b/generic/tclUtil.c
@@ -26,9 +26,9 @@ static ProcessGlobalValue executableName = {
 };
 
 /*
- * The following values are used in the flags arguments of Tcl*Scan*Element and
- * Tcl*Convert*Element. The values TCL_DONT_USE_BRACES and TCL_DONT_QUOTE_HASH
- * are defined in tcl.h, like so:
+ * The following values are used in the flags arguments of Tcl*Scan*Element
+ * and Tcl*Convert*Element.  The values TCL_DONT_USE_BRACES and
+ * TCL_DONT_QUOTE_HASH are defined in tcl.h, like so:
  *
 #define TCL_DONT_USE_BRACES     1
 #define TCL_DONT_QUOTE_HASH     8
@@ -54,8 +54,8 @@ static ProcessGlobalValue executableName = {
  * conversion is most appropriate for Tcl*Convert*Element() to perform, and
  * sets two bits of the flags value to indicate the mode selected.
  *
- * CONVERT_NONE		The element needs no quoting.  Its literal string
- *			is suitable as is.
+ * CONVERT_NONE		The element needs no quoting. Its literal string is
+ *			suitable as is.
  * CONVERT_BRACE	The conversion should be enclosing the literal string
  *			in braces.
  * CONVERT_ESCAPE	The conversion should be using backslashes to escape
@@ -63,19 +63,19 @@ static ProcessGlobalValue executableName = {
  * CONVERT_MASK		A mask value used to extract the conversion mode from
  *			the flags argument.
  *			Also indicates a strange conversion mode where all
- *			special characters are escaped with backslashes 
- *			*except for braces*.  This is a strange and unnecessary
+ *			special characters are escaped with backslashes
+ *			*except for braces*. This is a strange and unnecessary
  *			case, but it's part of the historical way in which
- *			lists have been formatted in Tcl.  To experiment with
+ *			lists have been formatted in Tcl. To experiment with
  *			removing this case, set the value of COMPAT to 0.
  *
- * One last flag value is used only by callers of TclScanElement().  The flag
+ * One last flag value is used only by callers of TclScanElement(). The flag
  * value produced by a call to Tcl*Scan*Element() will never leave this bit
  * set.
  *
- * CONVERT_ANY		The caller of TclScanElement() declares it can make
- *			no promise about what public flags will be passed to
- *			the matching call of TclConvertElement().  As such,
+ * CONVERT_ANY		The caller of TclScanElement() declares it can make no
+ *			promise about what public flags will be passed to the
+ *			matching call of TclConvertElement(). As such,
  *			TclScanElement() has to determine the worst case
  *			destination buffer length over all possibilities, and
  *			in other cases this means an overestimate of the
@@ -129,17 +129,17 @@ const Tcl_ObjType tclEndOffsetType = {
 /*
  *	*	STRING REPRESENTATION OF LISTS	*	*	*
  *
- * The next several routines implement the conversions of strings to and
- * from Tcl lists.  To understand their operation, the rules of parsing
- * and generating the string representation of lists must be known.  Here
- * we describe them in one place.
+ * The next several routines implement the conversions of strings to and from
+ * Tcl lists. To understand their operation, the rules of parsing and
+ * generating the string representation of lists must be known.  Here we
+ * describe them in one place.
  *
- * A list is made up of zero or more elements.  Any string is a list if
- * it is made up of alternating substrings of element-separating ASCII
- * whitespace and properly formatted elements.
+ * A list is made up of zero or more elements. Any string is a list if it is
+ * made up of alternating substrings of element-separating ASCII whitespace
+ * and properly formatted elements.
  *
- * The ASCII characters which can make up the whitespace between list
- * elements are:
+ * The ASCII characters which can make up the whitespace between list elements
+ * are:
  *
  *	\u0009	\t	TAB
  *	\u000A	\n	NEWLINE
@@ -158,69 +158,68 @@ const Tcl_ObjType tclEndOffsetType = {
  *	* Unlike command parsing, the BACKSLASH NEWLINE sequence is not
  *	  considered to be a whitespace character.
  *
- *	* Other Unicode whitespace characters (recognized by
- *	  [string is space] or Tcl_UniCharIsSpace()) do not play any role
- *	  as element separators in Tcl lists.
+ *	* Other Unicode whitespace characters (recognized by [string is space]
+ *	  or Tcl_UniCharIsSpace()) do not play any role as element separators
+ *	  in Tcl lists.
  *
  *	* The NUL byte ought not appear, as it is not in strings properly
  *	  encoded for Tcl, but if it is present, it is not treated as
- *	  separating whitespace, or a string terminator.  It is just
- *	  another character in a list element.
- *
- * The interpretaton of a formatted substring as a list element follows
- * rules similar to the parsing of the words of a command in a Tcl script.
- * Backslash substitution plays a key role, and is defined exactly as it is
- * in command parsing.  The same routine, TclParseBackslash() is used in both
- * command parsing and list parsing.  
- *
- * NOTE:  This means that if and when backslash substitution rules ever
- * change for command parsing, the interpretation of strings as lists also
- * changes.
+ *	  separating whitespace, or a string terminator. It is just another
+ *	  character in a list element.
+ *
+ * The interpretaton of a formatted substring as a list element follows rules
+ * similar to the parsing of the words of a command in a Tcl script. Backslash
+ * substitution plays a key role, and is defined exactly as it is in command
+ * parsing. The same routine, TclParseBackslash() is used in both command
+ * parsing and list parsing.
+ *
+ * NOTE: This means that if and when backslash substitution rules ever change
+ * for command parsing, the interpretation of strings as lists also changes.
  * 
  * Backslash substitution replaces an "escape sequence" of one or more
  * characters starting with
  *		\u005c	\	BACKSLASH
- * with a single character.  The one character escape sequent case happens
- * only when BACKSLASH is the last character in the string.  In all other
- * cases, the escape sequence is at least two characters long.
+ * with a single character. The one character escape sequent case happens only
+ * when BACKSLASH is the last character in the string. In all other cases, the
+ * escape sequence is at least two characters long.
  *
- * The formatted substrings are interpreted as element values according to
- * the following cases:
+ * The formatted substrings are interpreted as element values according to the
+ * following cases:
  *
  * * If the first character of a formatted substring is
  *		\u007b	{	OPEN BRACE
  *   then the end of the substring is the matching 
  *		\u007d	}	CLOSE BRACE
- *   character, where matching is determined by counting nesting levels,
- *   and not including any brace characters that are contained within a
- *   backslash escape sequence in the nesting count.  Having found the
- *   matching brace, all characters between the braces are the string
- *   value of the element.  If no matching close brace is found before the
- *   end of the string, the string is not a Tcl list.  If the character
- *   following the close brace is not an element separating whitespace
- *   character, or the end of the string, then the string is not a Tcl list.
- *
- *   NOTE: this differs from a brace-quoted word in the parsing of a
- *   Tcl command only in its treatment of the backslash-newline sequence.
- *   In a list element, the literal characters in the backslash-newline
- *   sequence become part of the element value.  In a script word,
- *   conversion to a single SPACE character is done.
+ *   character, where matching is determined by counting nesting levels, and
+ *   not including any brace characters that are contained within a backslash
+ *   escape sequence in the nesting count. Having found the matching brace,
+ *   all characters between the braces are the string value of the element.
+ *   If no matching close brace is found before the end of the string, the
+ *   string is not a Tcl list. If the character following the close brace is
+ *   not an element separating whitespace character, or the end of the string,
+ *   then the string is not a Tcl list.
+ *
+ *   NOTE: this differs from a brace-quoted word in the parsing of a Tcl
+ *   command only in its treatment of the backslash-newline sequence. In a
+ *   list element, the literal characters in the backslash-newline sequence
+ *   become part of the element value. In a script word, conversion to a
+ *   single SPACE character is done.
  *
  *   NOTE: Most list element values can be represented by a formatted
- *   substring using brace quoting.  The exceptions are any element value
- *   that includes an unbalanced brace not in a backslash escape sequence,
- *   and any value that ends with a backslash not itself in a backslash
- *   escape sequence.
+ *   substring using brace quoting. The exceptions are any element value that
+ *   includes an unbalanced brace not in a backslash escape sequence, and any
+ *   value that ends with a backslash not itself in a backslash escape
+ *   sequence.
  * 
  * * If the first character of a formatted substring is
  *		\u0022	"	QUOTE
  *   then the end of the substring is the next QUOTE character, not counting
  *   any QUOTE characters that are contained within a backslash escape
- *   sequence.  If no next QUOTE is found before the end of the string, the
- *   string is not a Tcl list.  If the character following the closing QUOTE
- *   is not an element separating whitespace character, or the end of the
- *   string, then the string is not a Tcl list.  Having found the limits
- *   of the substring, the element value is produced by performing backslash
+ *   sequence. If no next QUOTE is found before the end of the string, the
+ *   string is not a Tcl list. If the character following the closing QUOTE is
+ *   not an element separating whitespace character, or the end of the string,
+ *   then the string is not a Tcl list. Having found the limits of the
+ *   substring, the element value is produced by performing backslash
  *   substitution on the character sequence between the open and close QUOTEs.
  *
  *   NOTE: Any element value can be represented by this style of formatting,
@@ -231,7 +230,7 @@ const Tcl_ObjType tclEndOffsetType = {
  *   of the substring, the element value is produced by performing backslash
  *   substitution on it.
  *
- *   NOTE:  Any element value can be represented by this style of formatting,
+ *   NOTE: Any element value can be represented by this style of formatting,
  *   given suitable choice of backslash escape sequences, with one exception.
  *   The empty string cannot be represented as a list element without the use
  *   of either braces or quotes to delimit it.
@@ -239,32 +238,32 @@ const Tcl_ObjType tclEndOffsetType = {
  * This collection of parsing rules is implemented in the routine
  * TclFindElement().
  *
- * In order to produce lists that can be parsed by these rules, we need
- * the ability to distinguish between characters that are part of a list
- * element value from characters providing syntax that define the structure
- * of the list.  This means that our code that generates lists must at a
- * minimum be able to produce escape sequences for the 10 characters
- * identified above that have significance to a list parser.
+ * In order to produce lists that can be parsed by these rules, we need the
+ * ability to distinguish between characters that are part of a list element
+ * value from characters providing syntax that define the structure of the
+ * list. This means that our code that generates lists must at a minimum be
+ * able to produce escape sequences for the 10 characters identified above
+ * that have significance to a list parser.
  *
- *	*	*	CANONICAL LISTS	*	*	*	*	*	
+ *	*	*	CANONICAL LISTS	*	*	*	*	*
  *
  * In addition to the basic rules for parsing strings into Tcl lists, there
  * are additional properties to be met by the set of list values that are
  * generated by Tcl.  Such list values are often said to be in "canonical
  * form":
  *
- * * When any canonical list is evaluated as a Tcl script, it is a script
- *   of either zero commands (an empty list) or exactly one command.  The
- *   command word is exactly the first element of the list, and each argument
- *   word is exactly one of the following elements of the list.  This means
- *   that any characters that have special meaning during script evaluation
- *   need special treatment when canonical lists are produced:
+ * * When any canonical list is evaluated as a Tcl script, it is a script of
+ *   either zero commands (an empty list) or exactly one command. The command
+ *   word is exactly the first element of the list, and each argument word is
+ *   exactly one of the following elements of the list. This means that any
+ *   characters that have special meaning during script evaluation need
+ *   special treatment when canonical lists are produced:
  *
  *	* Whitespace between elements may not include NEWLINE.
  *	* The command terminating character,
  *		\u003b	;	SEMICOLON
- *	  must be BRACEd, QUOTEd, or escaped so that it does not terminate
- * 	  the command prematurely.
+ *	  must be BRACEd, QUOTEd, or escaped so that it does not terminate the
+ * 	  command prematurely.
  *	* Any of the characters that begin substitutions in scripts,
  *		\u0024	$	DOLLAR
  *		\u005b	[	OPEN BRACKET
@@ -274,11 +273,10 @@ const Tcl_ObjType tclEndOffsetType = {
  *		\u0023	#	HASH
  *	  that HASH character must be BRACEd, QUOTEd, or escaped so that it
  *	  does not convert the command into a comment.
- *	* Any list element that contains the character sequence
- *	  BACKSLASH NEWLINE cannot be formatted with BRACEs.  The
- *	  BACKSLASH character must be represented by an escape
- *	  sequence, and unless QUOTEs are used, the NEWLINE must
- *	  be as well.
+ *	* Any list element that contains the character sequence BACKSLASH
+ *	  NEWLINE cannot be formatted with BRACEs. The BACKSLASH character
+ *	  must be represented by an escape sequence, and unless QUOTEs are
+ *	  used, the NEWLINE must be as well.
  *
  * * It is also guaranteed that one can use a canonical list as a building
  *   block of a larger script within command substitution, as in this example:
@@ -289,66 +287,66 @@ const Tcl_ObjType tclEndOffsetType = {
  *
  * * Finally it is guaranteed that enclosing a canonical list in braces
  *   produces a new value that is also a canonical list.  This new list has
- *   length 1, and its only element is the original canonical list.  This
- *   same guarantee also makes it possible to construct scripts where an
- *   argument word is given a list value by enclosing the canonical form
- *   of that list in braces:
+ *   length 1, and its only element is the original canonical list.  This same
+ *   guarantee also makes it possible to construct scripts where an argument
+ *   word is given a list value by enclosing the canonical form of that list
+ *   in braces:
  *	set script "puts {[list $one $two $three]}"; eval $script
  *   This sort of coding was once fairly common, though it's become more
  *   idiomatic to see the following instead:
  *	set script [list puts [list $one $two $three]]; eval $script
- *   In order to support this guarantee, every canonical list must have 
+ *   In order to support this guarantee, every canonical list must have
  *   balance when counting those braces that are not in escape sequences.
  *
  * Within these constraints, the canonical list generation routines
- * TclScanElement() and TclConvertElement() attempt to generate the string
- * for any list that is easiest to read.  When an element value is itself
+ * TclScanElement() and TclConvertElement() attempt to generate the string for
+ * any list that is easiest to read. When an element value is itself
  * acceptable as the formatted substring, it is usually used (CONVERT_NONE).
- * When some quoting or escaping is required, use of BRACEs (CONVERT_BRACE)
- * is usually preferred over the use of escape sequences (CONVERT_ESCAPE).
- * There are some exceptions to both of these preferences for reasons of
- * code simplicity, efficiency, and continuation of historical habits.
- * Canonical lists never use the QUOTE formatting to delimit their elements
- * because that form of quoting does not nest, which makes construction of
- * nested lists far too much trouble.  Canonical lists always use only a
- * single SPACE character for element-separating whitespace.
+ * When some quoting or escaping is required, use of BRACEs (CONVERT_BRACE) is
+ * usually preferred over the use of escape sequences (CONVERT_ESCAPE). There
+ * are some exceptions to both of these preferences for reasons of code
+ * simplicity, efficiency, and continuation of historical habits. Canonical
+ * lists never use the QUOTE formatting to delimit their elements because that
+ * form of quoting does not nest, which makes construction of nested lists far
+ * too much trouble.  Canonical lists always use only a single SPACE character
+ * for element-separating whitespace.
  *
  *	*	*	FUTURE CONSIDERATIONS	*	*	*
  *
  * When a list element requires quoting or escaping due to a CLOSE BRACKET
  * character or an internal QUOTE character, a strange formatting mode is
- * recommended.  For example, if the value "a{b]c}d" is converted by the
- * usual modes:
+ * recommended. For example, if the value "a{b]c}d" is converted by the usual
+ * modes:
  *
  *	CONVERT_BRACE:	a{b]c}d		=> {a{b]c}d}
  *	CONVERT_ESCAPE:	a{b]c}d		=> a\{b\]c\}d
  *
- * we get perfectly usable formatted list elements.  However, this is not
- * what Tcl releases have been producing.  Instead, we have:
+ * we get perfectly usable formatted list elements. However, this is not what
+ * Tcl releases have been producing. Instead, we have:
  *
  *	CONVERT_MASK:	a{b]c}d		=> a{b\]c}d
  *
- * where the CLOSE BRACKET is escaped, but the BRACEs are not.  The same
- * effect can be seen replacing ] with " in this example.  There does not
- * appear to be any functional or aesthetic purpose for this strange
- * additional mode.  The sole purpose I can see for preserving it is to
- * keep generating the same formatted lists programmers have become accustomed
- * to, and perhaps written tests to expect.  That is, compatibility only.
- * The additional code complexity required to support this mode is significant.
- * The lines of code supporting it are delimited in the routines below with
- * #if COMPAT directives.  This makes it easy to experiment with eliminating
- * this formatting mode simply with "#define COMPAT 0" above.  I believe
- * this is worth considering.
+ * where the CLOSE BRACKET is escaped, but the BRACEs are not. The same effect
+ * can be seen replacing ] with " in this example. There does not appear to be
+ * any functional or aesthetic purpose for this strange additional mode. The
+ * sole purpose I can see for preserving it is to keep generating the same
+ * formatted lists programmers have become accustomed to, and perhaps written
+ * tests to expect. That is, compatibility only. The additional code
+ * complexity required to support this mode is significant. The lines of code
+ * supporting it are delimited in the routines below with #if COMPAT
+ * directives. This makes it easy to experiment with eliminating this
+ * formatting mode simply with "#define COMPAT 0" above. I believe this is
+ * worth considering.
  * 
- * Another consideration is the treatment of QUOTE characters in list elements.
- * TclConvertElement() must have the ability to produce the escape sequence
- * \" so that when a list element begins with a QUOTE we do not confuse
- * that first character with a QUOTE used as list syntax to define list
- * structure.  However, that is the only place where QUOTE characters need
- * quoting.  In this way, handling QUOTE could really be much more like
- * the way we handle HASH which also needs quoting and escaping only in
- * particular situations.  Following up this could increase the set of
- * list elements that can use the CONVERT_NONE formatting mode.
+ * Another consideration is the treatment of QUOTE characters in list
+ * elements. TclConvertElement() must have the ability to produce the escape
+ * sequence \" so that when a list element begins with a QUOTE we do not
+ * confuse that first character with a QUOTE used as list syntax to define
+ * list structure. However, that is the only place where QUOTE characters need
+ * quoting. In this way, handling QUOTE could really be much more like the way
+ * we handle HASH which also needs quoting and escaping only in particular
+ * situations. Following up this could increase the set of list elements that
+ * can use the CONVERT_NONE formatting mode.
  *
  * More speculative is that the demands of canonical list form require brace
  * balance for the list as a whole, while the current implementation achieves
@@ -366,15 +364,15 @@ const Tcl_ObjType tclEndOffsetType = {
  *
  *	Given 'bytes' pointing to 'numBytes' bytes, scan through them and
  *	count the number of whitespace runs that could be list element
- *	separators.  If 'numBytes' is -1, scan to the terminating '\0'.
- *	Not a full list parser.  Typically used to get a quick and dirty
- *	overestimate of length size in order to allocate space for an
- *	actual list parser to operate with.
+ *	separators. If 'numBytes' is -1, scan to the terminating '\0'. Not a
+ *	full list parser. Typically used to get a quick and dirty overestimate
+ *	of length size in order to allocate space for an actual list parser to
+ *	operate with.
  *
  * Results:
- *	Returns the largest number of list elements that could possibly
- *	be in this string, interpreted as a Tcl list.  If 'endPtr' is not
- *	NULL, writes a pointer to the end of the string scanned there.
+ *	Returns the largest number of list elements that could possibly be in
+ *	this string, interpreted as a Tcl list. If 'endPtr' is not NULL,
+ *	writes a pointer to the end of the string scanned there.
  *
  * Side effects:
  *	None.
@@ -395,16 +393,25 @@ TclMaxListLength(
 	goto done;
     }
 
-    /* No list element before leading white space */
+    /*
+     * No list element before leading white space.
+     */
+
     count += 1 - TclIsSpaceProc(*bytes); 
 
-    /* Count white space runs as potential element separators */
+    /*
+     * Count white space runs as potential element separators.
+     */
+
     while (numBytes) {
 	if ((numBytes == -1) && (*bytes == '\0')) {
 	    break;
 	}
 	if (TclIsSpaceProc(*bytes)) {
-	    /* Space run started; bump count */
+	    /*
+	     * Space run started; bump count.
+	     */
+
 	    count++;
 	    do {
 		bytes++;
@@ -413,16 +420,22 @@ TclMaxListLength(
 	    if ((numBytes == 0) || ((numBytes == -1) && (*bytes == '\0'))) {
 		break;
 	    }
-	    /* (*bytes) is non-space; return to counting state */
+
+	    /*
+	     * (*bytes) is non-space; return to counting state.
+	     */
 	}
 	bytes++;
 	numBytes -= (numBytes != -1);
     }
 
-    /* No list element following trailing white space */
+    /*
+     * No list element following trailing white space.
+     */
+
     count -= TclIsSpaceProc(bytes[-1]); 
 
-    done:
+  done:
     if (endPtr) {
 	*endPtr = bytes;
     }
@@ -449,18 +462,18 @@ TclMaxListLength(
  *	that's part of the element. If this is the last argument in the list,
  *	then *nextPtr will point just after the last character in the list
  *	(i.e., at the character at list+listLength). If sizePtr is non-NULL,
- *	*sizePtr is filled in with the number of bytes in the element. If
- *	the element is in braces, then *elementPtr will point to the character
+ *	*sizePtr is filled in with the number of bytes in the element. If the
+ *	element is in braces, then *elementPtr will point to the character
  *	after the opening brace and *sizePtr will not include either of the
  *	braces. If there isn't an element in the list, *sizePtr will be zero,
  *	and both *elementPtr and *nextPtr will point just after the last
  *	character in the list. If literalPtr is non-NULL, *literalPtr is set
- *	to a boolean value indicating whether the substring returned as
- *	the values of **elementPtr and *sizePtr is the literal value of
- *	a list element.  If not, a call to TclCopyAndCollapse() is needed
- *	to produce the actual value of the list element.  Note: this function
- *	does NOT collapse backslash sequences, but uses *literalPtr to tell
- * 	callers when it is required for them to do so.
+ *	to a boolean value indicating whether the substring returned as the
+ *	values of **elementPtr and *sizePtr is the literal value of a list
+ *	element. If not, a call to TclCopyAndCollapse() is needed to produce
+ *	the actual value of the list element. Note: this function does NOT
+ *	collapse backslash sequences, but uses *literalPtr to tell callers
+ *	when it is required for them to do so.
  *
  * Side effects:
  *	None.
@@ -587,9 +600,10 @@ TclFindElement(
 		/*
 		 * A backslash sequence not within a brace quoted element
 		 * means the value of the element is different from the
-		 * substring we are parsing.  A call to TclCopyAndCollapse()
-		 * is needed to produce the element value.  Inform the caller.
+		 * substring we are parsing. A call to TclCopyAndCollapse() is
+		 * needed to produce the element value. Inform the caller.
 		 */
+
 		literal = 0;
 	    }
 	    TclParseBackslash(p, limit - p, &numChars, NULL);
@@ -697,9 +711,9 @@ TclFindElement(
  *
  * Results:
  *	Count bytes get copied from src to dst. Along the way, backslash
- *	sequences are substituted in the copy.  After scanning count bytes
- *	from src, a null character is placed at the end of dst.  Returns
- *	the number of bytes that got written to dst.
+ *	sequences are substituted in the copy. After scanning count bytes from
+ *	src, a null character is placed at the end of dst. Returns the number
+ *	of bytes that got written to dst.
  *
  * Side effects:
  *	None.
@@ -717,6 +731,7 @@ TclCopyAndCollapse(
 
     while (count > 0) {
 	char c = *src;
+
 	if (c == '\\') {
 	    int numRead;
 	    int backslashCount = TclParseBackslash(src, count, &numRead, dst);
@@ -780,12 +795,11 @@ Tcl_SplitList(
     int length, size, i, result, elSize;
 
     /*
-     * Allocate enough space to work in. A (const char *) for each
-     * (possible) list element plus one more for terminating NULL,
-     * plus as many bytes as in the original string value, plus one
-     * more for a terminating '\0'.  Space used to hold element separating
-     * white space in the original string gets re-purposed to hold '\0'
-     * characters in the argv array.
+     * Allocate enough space to work in. A (const char *) for each (possible)
+     * list element plus one more for terminating NULL, plus as many bytes as
+     * in the original string value, plus one more for a terminating '\0'.
+     * Space used to hold element separating white space in the original
+     * string gets re-purposed to hold '\0' characters in the argv array.
      */
 
     size = TclMaxListLength(list, -1, &end) + 1;
@@ -844,9 +858,9 @@ Tcl_SplitList(
  *	enclosing braces) to make the string into a valid Tcl list element.
  *
  * Results:
- *	The return value is an overestimate of the number of bytes that
- *	will be needed by Tcl_ConvertElement to produce a valid list element
- *	from src. The word at *flagPtr is filled in with a value needed by
+ *	The return value is an overestimate of the number of bytes that will
+ *	be needed by Tcl_ConvertElement to produce a valid list element from
+ *	src. The word at *flagPtr is filled in with a value needed by
  *	Tcl_ConvertElement when doing the actual conversion.
  *
  * Side effects:
@@ -876,10 +890,10 @@ Tcl_ScanElement(
  *	to the first null byte.
  *
  * Results:
- *	The return value is an overestimate of the number of bytes that
- *	will be needed by Tcl_ConvertCountedElement to produce a valid list
- *	element from src. The word at *flagPtr is filled in with a value
- *	needed by Tcl_ConvertCountedElement when doing the actual conversion.
+ *	The return value is an overestimate of the number of bytes that will
+ *	be needed by Tcl_ConvertCountedElement to produce a valid list element
+ *	from src. The word at *flagPtr is filled in with a value needed by
+ *	Tcl_ConvertCountedElement when doing the actual conversion.
  *
  * Side effects:
  *	None.
@@ -906,24 +920,24 @@ Tcl_ScanCountedElement(
  *
  * TclScanElement --
  *
- *	This function is a companion function to TclConvertElement. It
- *	scans a string to see what needs to be done to it (e.g. add
- *	backslashes or enclosing braces) to make the string into a valid Tcl
- *	list element. If length is -1, then the string is scanned from src up
- *	to the first null byte.  A NULL value for src is treated as an
- *	empty string.  The incoming value of *flagPtr is a report from the
- *	caller what additional flags it will pass to TclConvertElement().
+ *	This function is a companion function to TclConvertElement. It scans a
+ *	string to see what needs to be done to it (e.g. add backslashes or
+ *	enclosing braces) to make the string into a valid Tcl list element. If
+ *	length is -1, then the string is scanned from src up to the first null
+ *	byte. A NULL value for src is treated as an empty string. The incoming
+ *	value of *flagPtr is a report from the caller what additional flags it
+ *	will pass to TclConvertElement().
  *
  * Results:
- *	The recommended formatting mode for the element is determined and
- *	a value is written to *flagPtr indicating that recommendation.  This
+ *	The recommended formatting mode for the element is determined and a
+ *	value is written to *flagPtr indicating that recommendation. This
  *	recommendation is combined with the incoming flag values in *flagPtr
  *	set by the caller to determine how many bytes will be needed by
  *	TclConvertElement() in which to write the formatted element following
- *	the recommendation modified by the flag values.  This number of bytes
- *	is the return value of the routine.  In some situations it may be
- *	an overestimate, but so long as the caller passes the same flags
- *	to TclConvertElement(), it will be large enough.
+ *	the recommendation modified by the flag values. This number of bytes
+ *	is the return value of the routine.  In some situations it may be an
+ *	overestimate, but so long as the caller passes the same flags to
+ *	TclConvertElement(), it will be large enough.
  *
  * Side effects:
  *	None.
@@ -941,7 +955,7 @@ TclScanElement(
     const char *p = src;
     int nestingLevel = 0;	/* Brace nesting count */
     int forbidNone = 0;		/* Do not permit CONVERT_NONE mode. Something
-				   needs protection or escape. */
+				 * needs protection or escape. */
     int requireEscape = 0;	/* Force use of CONVERT_ESCAPE mode.  For some
 				 * reason bare or brace-quoted form fails. */
     int extra = 0;		/* Count of number of extra bytes needed for
@@ -953,10 +967,13 @@ TclScanElement(
     int preferEscape = 0;	/* Use preferences to track whether to use */
     int preferBrace = 0;	/* CONVERT_MASK mode. */
     int braceCount = 0;		/* Count of all braces '{' '}' seen. */
-#endif
+#endif /* COMPAT */
     
     if ((p == NULL) || (length == 0) || ((*p == '\0') && (length == -1))) {
-	/* Empty string element must be brace quoted. */
+	/*
+	 * Empty string element must be brace quoted.
+	 */
+
 	*flagPtr = CONVERT_BRACE;
 	return 2;
     }
@@ -966,10 +983,11 @@ TclScanElement(
 	 * Must escape or protect so leading character of value is not
 	 * misinterpreted as list element delimiting syntax.
 	 */
+
 	forbidNone = 1;
 #if COMPAT
 	preferBrace = 1;
-#endif
+#endif /* COMPAT */
     }
 
     while (length) {
@@ -978,18 +996,21 @@ TclScanElement(
 	case '{':	/* TYPE_BRACE */
 #if COMPAT
 	    braceCount++;
-#endif
+#endif /* COMPAT */
 	    extra++;				/* Escape '{' => '\{' */
 	    nestingLevel++;
 	    break;
 	case '}':	/* TYPE_BRACE */
 #if COMPAT
 	    braceCount++;
-#endif
+#endif /* COMPAT */
 	    extra++;				/* Escape '}' => '\}' */
 	    nestingLevel--;
 	    if (nestingLevel < 0) {
-		/* Unbalanced braces!  Cannot format with brace quoting. */
+		/*
+		 * Unbalanced braces!  Cannot format with brace quoting.
+		 */
+
 		requireEscape = 1;
 	    }
 	    break;
@@ -1002,7 +1023,7 @@ TclScanElement(
 	    break;
 #else
 	    /* FLOW THROUGH */
-#endif
+#endif /* COMPAT */
 	case '[':	/* TYPE_SUBS */
 	case '$':	/* TYPE_SUBS */
 	case ';':	/* TYPE_COMMAND_END */
@@ -1016,18 +1037,25 @@ TclScanElement(
 	    extra++;		/* Escape sequences all one byte longer. */
 #if COMPAT
 	    preferBrace = 1;
-#endif
+#endif /* COMPAT */
 	    break;
 	case '\\':	/* TYPE_SUBS */
 	    extra++;				/* Escape '\' => '\\' */
 	    if ((length == 1) || ((length == -1) && (p[1] == '\0'))) {
-		/* Final backslash. Cannot format with brace quoting. */
+		/*
+		 * Final backslash. Cannot format with brace quoting.
+		 */
+
 		requireEscape = 1;		
 		break;
 	    }
 	    if (p[1] == '\n') {
 		extra++;	/* Escape newline => '\n', one byte longer */
-		/* Backslash newline sequence.  Brace quoting not permitted. */
+
+		/*
+		 * Backslash newline sequence.  Brace quoting not permitted.
+		 */
+
 		requireEscape = 1;
 		length -= (length > 0);
 		p++;
@@ -1041,7 +1069,7 @@ TclScanElement(
 	    forbidNone = 1;
 #if COMPAT
 	    preferBrace = 1;
-#endif
+#endif /* COMPAT */
 	    break;
 	case '\0':	/* TYPE_SUBS */
 	    if (length == -1) {
@@ -1055,22 +1083,33 @@ TclScanElement(
 	p++;
     }
 
-    endOfString:
+  endOfString:
     if (nestingLevel != 0) {
-	/* Unbalanced braces!  Cannot format with brace quoting. */
+	/*
+	 * Unbalanced braces!  Cannot format with brace quoting.
+	 */
+
 	requireEscape = 1;
     }
 
-    /* We need at least as many bytes as are in the element value... */
+    /*
+     * We need at least as many bytes as are in the element value...
+     */
+
     bytesNeeded = p - src;
 
     if (requireEscape) {
 	/*
-	 * We must use escape sequences.  Add all the extra bytes needed
-	 * to have room to create them.
+	 * We must use escape sequences.  Add all the extra bytes needed to
+	 * have room to create them.
 	 */
+
 	bytesNeeded += extra;
-	/* Make room to escape leading #, if needed. */
+
+	/*
+	 * Make room to escape leading #, if needed.
+	 */
+
 	if ((*src == '#') && !(*flagPtr & TCL_DONT_QUOTE_HASH)) {
 	    bytesNeeded++;
 	}
@@ -1080,12 +1119,13 @@ TclScanElement(
     if (*flagPtr & CONVERT_ANY) {
 	/*
 	 * The caller has not let us know what flags it will pass to
-	 * TclConvertElement() so compute the max size we might need for
-	 * any possible choice.  Normally the formatting using escape
-	 * sequences is the longer one, and a minimum "extra" value of 2
-	 * makes sure we don't request too small a buffer in those edge
-	 * cases where that's not true.
+	 * TclConvertElement() so compute the max size we might need for any
+	 * possible choice.  Normally the formatting using escape sequences is
+	 * the longer one, and a minimum "extra" value of 2 makes sure we
+	 * don't request too small a buffer in those edge cases where that's
+	 * not true.
 	 */
+
 	if (extra < 2) {
 	    extra = 2;
 	}
@@ -1093,59 +1133,78 @@ TclScanElement(
 	*flagPtr |= TCL_DONT_USE_BRACES;
     }
     if (forbidNone) {
-	/* We must request some form of quoting of escaping... */
+	/*
+	 * We must request some form of quoting of escaping...
+	 */
+
 #if COMPAT
 	if (preferEscape && !preferBrace) {
 	    /*
-	     * If we are quoting solely due to ] or internal " characters
-	     * use the CONVERT_MASK mode where we escape all special 
-	     * characters except for braces.  "extra" counted space needed
-	     * to escape braces too, so substract "braceCount" to get our
-	     * actual needs.
+	     * If we are quoting solely due to ] or internal " characters use
+	     * the CONVERT_MASK mode where we escape all special characters
+	     * except for braces. "extra" counted space needed to escape
+	     * braces too, so substract "braceCount" to get our actual needs.
 	     */
+
 	    bytesNeeded += (extra - braceCount);
 	    /* Make room to escape leading #, if needed. */
 	    if ((*src == '#') && !(*flagPtr & TCL_DONT_QUOTE_HASH)) {
 		bytesNeeded++;
 	    }
+
 	    /*
 	     * If the caller reports it will direct TclConvertElement() to
 	     * use full escapes on the element, add back the bytes needed to
 	     * escape the braces.
 	     */
+
 	    if (*flagPtr & TCL_DONT_USE_BRACES) {
 		bytesNeeded += braceCount;
 	    }
 	    *flagPtr = CONVERT_MASK;
 	    goto overflowCheck;
 	}
-#endif
+#endif /* COMPAT */
 	if (*flagPtr & TCL_DONT_USE_BRACES) {
 	    /*
 	     * If the caller reports it will direct TclConvertElement() to
 	     * use escapes, add the extra bytes needed to have room for them.
 	     */
+
 	    bytesNeeded += extra;
-	    /* Make room to escape leading #, if needed. */
+
+	    /*
+	     * Make room to escape leading #, if needed.
+	     */
+
 	    if ((*src == '#') && !(*flagPtr & TCL_DONT_QUOTE_HASH)) {
 		bytesNeeded++;
 	    }
 	} else {
-	    /* Add 2 bytes for room for the enclosing braces. */
+	    /*
+	     * Add 2 bytes for room for the enclosing braces.
+	     */
+
 	    bytesNeeded += 2;
 	}
 	*flagPtr = CONVERT_BRACE;
 	goto overflowCheck;
     }
 
-    /* So far, no need to quote or escape anything. */
+    /*
+     * So far, no need to quote or escape anything.
+     */
+
     if ((*src == '#') && !(*flagPtr & TCL_DONT_QUOTE_HASH)) {
-	/* If we need to quote a leading #, make room to enclose in braces. */
+	/*
+	 * If we need to quote a leading #, make room to enclose in braces.
+	 */
+
 	bytesNeeded += 2;
     }
     *flagPtr = CONVERT_NONE;
 
-    overflowCheck:
+  overflowCheck:
     if (bytesNeeded < 0) {
 	Tcl_Panic("TclScanElement: string length overflow");
     }
@@ -1220,9 +1279,9 @@ Tcl_ConvertCountedElement(
  *
  * TclConvertElement --
  *
- *	This is a companion function to TclScanElement. Given the
- *	information produced by TclScanElement, this function converts
- *	a string to a list element equal to that string.
+ *	This is a companion function to TclScanElement. Given the information
+ *	produced by TclScanElement, this function converts a string to a list
+ *	element equal to that string.
  *
  * Results:
  *	Information is copied to *dst in the form of a list element identical
@@ -1236,7 +1295,8 @@ Tcl_ConvertCountedElement(
  *----------------------------------------------------------------------
  */
 
-int TclConvertElement(
+int
+TclConvertElement(
     register const char *src,	/* Source information for list element. */
     int length,			/* Number of bytes in src, or -1. */
     char *dst,			/* Place to put list-ified element. */
@@ -1245,19 +1305,28 @@ int TclConvertElement(
     int conversion = flags & CONVERT_MASK;
     char *p = dst;
 
-    /* Let the caller demand we use escape sequences rather than braces. */
+    /*
+     * Let the caller demand we use escape sequences rather than braces.
+     */
+
     if ((flags & TCL_DONT_USE_BRACES) && (conversion & CONVERT_BRACE)) {
 	conversion = CONVERT_ESCAPE;
     }
 
-    /* No matter what the caller demands, empty string must be braced! */
-    if ((src == NULL) || (length == 0) || ((*src == '\0') && (length == -1))) {
+    /*
+     * No matter what the caller demands, empty string must be braced!
+     */
+
+    if ((src == NULL) || (length == 0) || (*src == '\0' && length == -1)) {
 	src = tclEmptyStringRep;
 	length = 0;
 	conversion = CONVERT_BRACE;
     }
 
-    /* Escape leading hash as needed and requested. */
+    /*
+     * Escape leading hash as needed and requested.
+     */
+
     if ((*src == '#') && !(flags & TCL_DONT_QUOTE_HASH)) {
 	if (conversion == CONVERT_ESCAPE) {
 	    p[0] = '\\';
@@ -1270,7 +1339,10 @@ int TclConvertElement(
 	}
     }
 
-    /* No escape or quoting needed.  Copy the literal string value. */
+    /*
+     * No escape or quoting needed.  Copy the literal string value.
+     */
+
     if (conversion == CONVERT_NONE) {
 	if (length == -1) {
 	    /* TODO: INT_MAX overflow? */
@@ -1284,7 +1356,10 @@ int TclConvertElement(
 	}
     }
 
-    /* Formatted string is original string enclosed in braces. */
+    /*
+     * Formatted string is original string enclosed in braces.
+     */
+
     if (conversion == CONVERT_BRACE) {
 	*p = '{';
 	p++;
@@ -1304,7 +1379,10 @@ int TclConvertElement(
 
     /* conversion == CONVERT_ESCAPE or CONVERT_MASK */
 
-    /* Formatted string is original string converted to escape sequences. */
+    /*
+     * Formatted string is original string converted to escape sequences.
+     */
+
     for ( ; length; src++, length -= (length > 0)) {
 	switch (*src) {
 	case ']':
@@ -1320,13 +1398,12 @@ int TclConvertElement(
 	case '{':
 	case '}':
 #if COMPAT
-	    if (conversion == CONVERT_ESCAPE) {
-#endif
+	    if (conversion == CONVERT_ESCAPE)
+#endif /* COMPAT */
+	    {
 		*p = '\\';
 		p++;
-#if COMPAT
 	    }
-#endif
 	    break;
 	case '\f':
 	    *p = '\\';
@@ -1362,13 +1439,15 @@ int TclConvertElement(
 	    if (length == -1) {
 		return p - dst;
 	    }
+
 	    /* 
-	     * If we reach this point, there's an embedded NULL in the
-	     * string range being processed, which should not happen when
-	     * the encoding rules for Tcl strings are properly followed.
-	     * If the day ever comes when we stop tolerating such things,
-	     * this is where to put the Tcl_Panic().
+	     * If we reach this point, there's an embedded NULL in the string
+	     * range being processed, which should not happen when the
+	     * encoding rules for Tcl strings are properly followed.  If the
+	     * day ever comes when we stop tolerating such things, this is
+	     * where to put the Tcl_Panic().
 	     */
+
 	    break;
 	}
 	*p = *src;
@@ -1402,17 +1481,18 @@ Tcl_Merge(
     int argc,			/* How many strings to merge. */
     const char *const *argv)	/* Array of string values. */
 {
-#   define LOCAL_SIZE 20
+#define LOCAL_SIZE 20
     int localFlags[LOCAL_SIZE], *flagPtr = NULL;
     int i, bytesNeeded = 0;
     char *result, *dst;
     const int maxFlags = UINT_MAX / sizeof(int);
 
+    /*
+     * Handle empty list case first, so logic of the general case can be
+     * simpler.
+     */
+
     if (argc == 0) {
-	/*
-	 * Handle empty list case first, so logic of the general case
-	 * can be simpler.
-	 */
 	result = ckalloc(1);
 	result[0] = '\0';
 	return result;
@@ -1426,17 +1506,17 @@ Tcl_Merge(
 	flagPtr = localFlags;
     } else if (argc > maxFlags) {
 	/*
-	 * We cannot allocate a large enough flag array to format this
-	 * list in one pass.  We could imagine converting this routine
-	 * to a multi-pass implementation, but for sizeof(int) == 4, 
-	 * the limit is a max of 2^30 list elements and since each element
-	 * is at least one byte formatted, and requires one byte space
-	 * between it and the next one, that a minimum space requirement
-	 * of 2^31 bytes, which is already INT_MAX. If we tried to format
-	 * a list of > maxFlags elements, we're just going to overflow
-	 * the size limits on the formatted string anyway, so just issue
-	 * that same panic early.
+	 * We cannot allocate a large enough flag array to format this list in
+	 * one pass.  We could imagine converting this routine to a multi-pass
+	 * implementation, but for sizeof(int) == 4, the limit is a max of
+	 * 2^30 list elements and since each element is at least one byte
+	 * formatted, and requires one byte space between it and the next one,
+	 * that a minimum space requirement of 2^31 bytes, which is already
+	 * INT_MAX. If we tried to format a list of > maxFlags elements, we're
+	 * just going to overflow the size limits on the formatted string
+	 * anyway, so just issue that same panic early.
 	 */
+
 	Tcl_Panic("max size for a Tcl value (%d bytes) exceeded", INT_MAX);
     } else {
 	flagPtr = ckalloc(argc * sizeof(int));
@@ -1511,9 +1591,10 @@ Tcl_Backslash(
  *----------------------------------------------------------------------
  *
  * TclTrimRight --
- *	Takes two counted strings in the Tcl encoding which must both be
- *	null terminated.  Conceptually trims from the right side of the
- *	first string all characters found in the second string.
+ *
+ *	Takes two counted strings in the Tcl encoding which must both be null
+ *	terminated. Conceptually trims from the right side of the first string
+ *	all characters found in the second string.
  *
  * Results:
  *	The number of bytes to be removed from the end of the string.
@@ -1526,10 +1607,10 @@ Tcl_Backslash(
 
 int
 TclTrimRight(
-    const char *bytes,	/* String to be trimmed... */
-    int numBytes,	/* ...and its length in bytes */
-    const char *trim,	/* String of trim characters... */
-    int numTrim)	/* ...and its length in bytes */
+    const char *bytes,		/* String to be trimmed... */
+    int numBytes,		/* ...and its length in bytes */
+    const char *trim,		/* String of trim characters... */
+    int numTrim)		/* ...and its length in bytes */
 {
     const char *p = bytes + numBytes;
     int pInc;
@@ -1538,12 +1619,18 @@ TclTrimRight(
 	Tcl_Panic("TclTrimRight works only on null-terminated strings");
     }
 
-    /* Empty strings -> nothing to do */
+    /*
+     * Empty strings -> nothing to do.
+     */
+
     if ((numBytes == 0) || (numTrim == 0)) {
 	return 0;
     }
 
-    /* Outer loop: iterate over string to be trimmed */
+    /*
+     * Outer loop: iterate over string to be trimmed.
+     */
+
     do {
 	Tcl_UniChar ch1;
 	const char *q = trim;
@@ -1552,7 +1639,10 @@ TclTrimRight(
 	p = Tcl_UtfPrev(p, bytes);
  	pInc = TclUtfToUniChar(p, &ch1);
 
-	/* Inner loop: scan trim string for match to current character */
+	/*
+	 * Inner loop: scan trim string for match to current character.
+	 */
+
 	do {
 	    Tcl_UniChar ch2;
 	    int qInc = TclUtfToUniChar(q, &ch2);
@@ -1566,7 +1656,10 @@ TclTrimRight(
 	} while (bytesLeft);
 
 	if (bytesLeft == 0) {
-	    /* No match; trim task done; *p is last non-trimmed char */
+	    /*
+	     * No match; trim task done; *p is last non-trimmed char.
+	     */
+
 	    p += pInc;
 	    break;
 	}
@@ -1579,9 +1672,10 @@ TclTrimRight(
  *----------------------------------------------------------------------
  *
  * TclTrimLeft --
- *	Takes two counted strings in the Tcl encoding which must both be
- *	null terminated.  Conceptually trims from the left side of the
- *	first string all characters found in the second string.
+ *
+ *	Takes two counted strings in the Tcl encoding which must both be null
+ *	terminated. Conceptually trims from the left side of the first string
+ *	all characters found in the second string.
  *
  * Results:
  *	The number of bytes to be removed from the start of the string.
@@ -1594,10 +1688,10 @@ TclTrimRight(
 
 int
 TclTrimLeft(
-    const char *bytes,	/* String to be trimmed... */
-    int numBytes,	/* ...and its length in bytes */
-    const char *trim,	/* String of trim characters... */
-    int numTrim)	/* ...and its length in bytes */
+    const char *bytes,		/* String to be trimmed... */
+    int numBytes,		/* ...and its length in bytes */
+    const char *trim,		/* String of trim characters... */
+    int numTrim)		/* ...and its length in bytes */
 {
     const char *p = bytes;
 
@@ -1605,19 +1699,28 @@ TclTrimLeft(
 	Tcl_Panic("TclTrimLeft works only on null-terminated strings");
     }
 
-    /* Empty strings -> nothing to do */
+    /*
+     * Empty strings -> nothing to do.
+     */
+
     if ((numBytes == 0) || (numTrim == 0)) {
 	return 0;
     }
 
-    /* Outer loop: iterate over string to be trimmed */
+    /*
+     * Outer loop: iterate over string to be trimmed.
+     */
+
     do {
 	Tcl_UniChar ch1;
 	int pInc = TclUtfToUniChar(p, &ch1);
 	const char *q = trim;
 	int bytesLeft = numTrim;
 
-	/* Inner loop: scan trim string for match to current character */
+	/*
+	 * Inner loop: scan trim string for match to current character.
+	 */
+
 	do {
 	    Tcl_UniChar ch2;
 	    int qInc = TclUtfToUniChar(q, &ch2);
@@ -1631,7 +1734,10 @@ TclTrimLeft(
 	} while (bytesLeft);
 
 	if (bytesLeft == 0) {
-	    /* No match; trim task done; *p is first non-trimmed char */
+	    /*
+	     * No match; trim task done; *p is first non-trimmed char.
+	     */
+
 	    break;
 	}
 
@@ -1673,14 +1779,20 @@ Tcl_Concat(
     int i, needSpace = 0, bytesNeeded = 0;
     char *result, *p;
 
-    /* Dispose of the empty result corner case first to simplify later code */
+    /*
+     * Dispose of the empty result corner case first to simplify later code.
+     */
+
     if (argc == 0) {
 	result = (char *) ckalloc(1);
 	result[0] = '\0';
 	return result;
     }
 
-    /* First allocate the result buffer at the size required */
+    /*
+     * First allocate the result buffer at the size required.
+     */
+
     for (i = 0;  i < argc;  i++) {
 	bytesNeeded += strlen(argv[i]);
 	if (bytesNeeded < 0) {
@@ -1689,13 +1801,18 @@ Tcl_Concat(
     }
     if (bytesNeeded + argc - 1 < 0) {
 	/*
-	 * Panic test could be tighter, but not going to bother for 
-	 * this legacy routine.
+	 * Panic test could be tighter, but not going to bother for this
+	 * legacy routine.
 	 */
+
 	Tcl_Panic("Tcl_Concat: max size of Tcl value exceeded");
     }
-    /* All element bytes + (argc - 1) spaces + 1 terminating NULL */
-    result = (char *) ckalloc((unsigned) (bytesNeeded + argc));
+
+    /*
+     * All element bytes + (argc - 1) spaces + 1 terminating NULL.
+     */
+
+    result = ckalloc((unsigned) (bytesNeeded + argc));
 
     for (p = result, i = 0;  i < argc;  i++) {
 	int trim, elemLength;
@@ -1704,26 +1821,35 @@ Tcl_Concat(
 	element = argv[i];
 	elemLength = strlen(argv[i]);
 
-	/* Trim away the leading whitespace */
+	/*
+	 * Trim away the leading whitespace.
+	 */
+
 	trim = TclTrimLeft(element, elemLength, CONCAT_WS, CONCAT_WS_SIZE);
 	element += trim;
 	elemLength -= trim;
 
 	/*
-	 * Trim away the trailing whitespace.  Do not permit trimming
-	 * to expose a final backslash character.
+	 * Trim away the trailing whitespace. Do not permit trimming to expose
+	 * a final backslash character.
 	 */
 
 	trim = TclTrimRight(element, elemLength, CONCAT_WS, CONCAT_WS_SIZE);
 	trim -= trim && (element[elemLength - trim - 1] == '\\');
 	elemLength -= trim;
 
-	/* If we're left with empty element after trimming, do nothing */
+	/*
+	 * If we're left with empty element after trimming, do nothing.
+	 */
+
 	if (elemLength == 0) {
 	    continue;
 	}
 
-	/* Append to the result with space if needed */
+	/*
+	 * Append to the result with space if needed.
+	 */
+
 	if (needSpace) {
 	    *p++ = ' ';
 	}
@@ -1802,9 +1928,10 @@ Tcl_ConcatObj(
     /*
      * Something cannot be determined to be safe, so build the concatenation
      * the slow way, using the string representations.
+     *
+     * First try to pre-allocate the size required.
      */
 
-    /* First try to pre-allocate the size required */
     for (i = 0;  i < objc;  i++) {
 	element = TclGetStringFromObj(objv[i], &elemLength);
 	bytesNeeded += elemLength;
@@ -1812,11 +1939,13 @@ Tcl_ConcatObj(
 	    break;
 	}
     }
+
     /*
-     * Does not matter if this fails, will simply try later to build up
-     * the string with each Append reallocating as needed with the usual
-     * string append algorithm.  When that fails it will report the error.
+     * Does not matter if this fails, will simply try later to build up the
+     * string with each Append reallocating as needed with the usual string
+     * append algorithm.  When that fails it will report the error.
      */
+
     TclNewObj(resPtr);
     Tcl_AttemptSetObjLength(resPtr, bytesNeeded + objc - 1);
     Tcl_SetObjLength(resPtr, 0);
@@ -1826,26 +1955,35 @@ Tcl_ConcatObj(
 	
 	element = TclGetStringFromObj(objv[i], &elemLength);
 
-	/* Trim away the leading whitespace */
+	/*
+	 * Trim away the leading whitespace.
+	 */
+
 	trim = TclTrimLeft(element, elemLength, CONCAT_WS, CONCAT_WS_SIZE);
 	element += trim;
 	elemLength -= trim;
 
 	/*
-	 * Trim away the trailing whitespace.  Do not permit trimming
-	 * to expose a final backslash character.
+	 * Trim away the trailing whitespace. Do not permit trimming to expose
+	 * a final backslash character.
 	 */
 
 	trim = TclTrimRight(element, elemLength, CONCAT_WS, CONCAT_WS_SIZE);
 	trim -= trim && (element[elemLength - trim - 1] == '\\');
 	elemLength -= trim;
 
-	/* If we're left with empty element after trimming, do nothing */
+	/*
+	 * If we're left with empty element after trimming, do nothing.
+	 */
+
 	if (elemLength == 0) {
 	    continue;
 	}
 
-	/* Append to the result with space if needed */
+	/*
+	 * Append to the result with space if needed.
+	 */
+
 	if (needSpace) {
 	    Tcl_AppendToObj(resPtr, " ", 1);
 	}
@@ -2249,6 +2387,7 @@ TclByteArrayMatch(
 			/*
 			 * Matches ranges of form [a-z] or [z-a].
 			 */
+
 			break;
 		    }
 		} else if (startChar == ch1) {
@@ -2295,9 +2434,9 @@ TclByteArrayMatch(
  *
  * TclStringMatchObj --
  *
- *	See if a particular string matches a particular pattern.
- *	Allows case insensitivity.  This is the generic multi-type handler
- *	for the various matching algorithms.
+ *	See if a particular string matches a particular pattern. Allows case
+ *	insensitivity. This is the generic multi-type handler for the various
+ *	matching algorithms.
  *
  * Results:
  *	The return value is 1 if string matches pattern, and 0 otherwise. The
@@ -2657,24 +2796,8 @@ Tcl_DStringResult(
     Tcl_DString *dsPtr)		/* Dynamic string that is to become the
 				 * result of interp. */
 {
-    Interp *iPtr = (Interp *) interp;
-
     Tcl_ResetResult(interp);
-
-    if (dsPtr->string != dsPtr->staticSpace) {
-	iPtr->result = dsPtr->string;
-	iPtr->freeProc = TCL_DYNAMIC;
-    } else if (dsPtr->length < TCL_RESULT_SIZE) {
-	iPtr->result = iPtr->resultSpace;
-	memcpy(iPtr->result, dsPtr->string, dsPtr->length + 1);
-    } else {
-	Tcl_SetResult(interp, dsPtr->string, TCL_VOLATILE);
-    }
-
-    dsPtr->string = dsPtr->staticSpace;
-    dsPtr->length = 0;
-    dsPtr->spaceAvl = TCL_DSTRING_STATIC_SIZE;
-    dsPtr->staticSpace[0] = '\0';
+    Tcl_SetObjResult(interp, TclDStringToObj(dsPtr));
 }
 
 /*
@@ -2710,6 +2833,39 @@ Tcl_DStringGetResult(
     }
 
     /*
+     * Do more efficient transfer when we know the result is a Tcl_Obj. When
+     * there's no st`ring result, we only have to deal with two cases:
+     *
+     *  1. When the string rep is the empty string, when we don't copy but
+     *     instead use the staticSpace in the DString to hold an empty string.
+
+     *  2. When the string rep is not there or there's a real string rep, when
+     *     we use Tcl_GetString to fetch (or generate) the string rep - which
+     *     we know to have been allocated with ckalloc() - and use it to
+     *     populate the DString space. Then, we free the internal rep. and set
+     *     the object's string representation back to the canonical empty
+     *     string.
+     */
+
+    if (!iPtr->result[0] && iPtr->objResultPtr
+	    && !Tcl_IsShared(iPtr->objResultPtr)) {
+	if (iPtr->objResultPtr->bytes == tclEmptyStringRep) {
+	    dsPtr->string = dsPtr->staticSpace;
+	    dsPtr->string[0] = 0;
+	    dsPtr->length = 0;
+	    dsPtr->spaceAvl = TCL_DSTRING_STATIC_SIZE;
+	} else {
+	    dsPtr->string = Tcl_GetString(iPtr->objResultPtr);
+	    dsPtr->length = iPtr->objResultPtr->length;
+	    dsPtr->spaceAvl = dsPtr->length + 1;
+	    TclFreeIntRep(iPtr->objResultPtr);
+	    iPtr->objResultPtr->bytes = tclEmptyStringRep;
+	    iPtr->objResultPtr->length = 0;
+	}
+	return;
+    }
+
+    /*
      * If the string result is empty, move the object result to the string
      * result, then reset the object result.
      */
@@ -2947,12 +3103,12 @@ Tcl_PrintDouble(
 	 * Tcl 8.4 implements the first of these, which gives rise to
 	 * anomalies in formatting:
 	 *
-	 * % expr 0.1
-	 * 0.10000000000000001
-	 * % expr 0.01
-	 * 0.01
-	 * % expr 1e-7
-	 * 9.9999999999999995e-08
+	 *	% expr 0.1
+	 *	0.10000000000000001
+	 *	% expr 0.01
+	 *	0.01
+	 *	% expr 1e-7
+	 *	9.9999999999999995e-08
 	 *
 	 * For human readability, it appears better to choose the second rule,
 	 * and let [expr 0.1] return 0.1. But for 8.4 compatibility, we prefer
@@ -2965,8 +3121,8 @@ Tcl_PrintDouble(
 	 */
 
 	digits = TclDoubleDigits(value, *precisionPtr,
-				 TCL_DD_E_FORMAT /* | TCL_DD_SHORTEN_FLAG */, 
-				 &exponent, &signum, &end);
+		TCL_DD_E_FORMAT /* | TCL_DD_SHORTEN_FLAG */, 
+		&exponent, &signum, &end);
     }
     if (signum) {
 	*dst++ = '-';
@@ -3222,10 +3378,10 @@ TclNeedSpace(
  */
 
 int
-TclFormatInt(buffer, n)
-    char *buffer;		/* Points to the storage into which the
+TclFormatInt(
+    char *buffer,		/* Points to the storage into which the
 				 * formatted characters are written. */
-    long n;			/* The integer to format. */
+    long n)			/* The integer to format. */
 {
     long intVal;
     int i;
@@ -3243,9 +3399,9 @@ TclFormatInt(buffer, n)
     }
 
     /*
-     * Check whether "n" is the maximum negative value. This is
-     * -2^(m-1) for an m-bit word, and has no positive equivalent;
-     * negating it produces the same value.
+     * Check whether "n" is the maximum negative value. This is -2^(m-1) for
+     * an m-bit word, and has no positive equivalent; negating it produces the
+     * same value.
      */
 
     intVal = -n;			/* [Bug 3390638] Workaround for*/
@@ -3277,6 +3433,7 @@ TclFormatInt(buffer, n)
 
     for (j = 0;  j < i;  j++, i--) {
 	char tmp = buffer[i];
+
 	buffer[i] = buffer[j];
 	buffer[j] = tmp;
     }
@@ -3742,7 +3899,7 @@ TclSetProcessGlobalValue(
     if (NULL != pgvPtr->value) {
 	ckfree(pgvPtr->value);
     } else {
-	Tcl_CreateExitHandler(FreeProcessGlobalValue, (ClientData) pgvPtr);
+	Tcl_CreateExitHandler(FreeProcessGlobalValue, pgvPtr);
     }
     bytes = Tcl_GetStringFromObj(newValue, &pgvPtr->numBytes);
     pgvPtr->value = ckalloc(pgvPtr->numBytes + 1);
diff --git a/generic/tclZlib.c b/generic/tclZlib.c
index 544fb6e..11490f1 100644
--- a/generic/tclZlib.c
+++ b/generic/tclZlib.c
@@ -5,7 +5,7 @@
  *
  * Copyright (C) 2004-2005 Pascal Scheffers <pascal@scheffers.net>
  * Copyright (C) 2005 Unitas Software B.V.
- * Copyright (c) 2008-2009 Donal K. Fellows
+ * Copyright (c) 2008-2012 Donal K. Fellows
  *
  * Parts written by Jean-Claude Wippler, as part of Tclkit, placed in the
  * public domain March 2003.
@@ -74,8 +74,27 @@ typedef struct {
     int wbits;			/* The encoded compression mode, so we can
 				 * restart the stream if necessary. */
     Tcl_Command cmd;		/* Token for the associated Tcl command. */
+    Tcl_Obj *compDictObj;	/* Byte-array object containing compression
+				 * dictionary (not dictObj!) to use if
+				 * necessary. */
+    int flags;			/* Miscellaneous flag bits. */
+    GzipHeader *gzHeaderPtr;	/* If we've allocated a gzip header
+				 * structure. */
 } ZlibStreamHandle;
 
+#define DICT_TO_SET	0x1	/* If we need to set a compression dictionary
+				 * in the low-level engine at the next
+				 * opportunity. */
+
+/*
+ * Macros to make it clearer in some of the twiddlier accesses what is
+ * happening.
+ */
+
+#define IsRawStream(zshPtr)	((zshPtr)->format == TCL_ZLIB_FORMAT_RAW)
+#define HaveDictToSet(zshPtr)	((zshPtr)->flags & DICT_TO_SET)
+#define DictWasSet(zshPtr)	((zshPtr)->flags |= ~DICT_TO_SET)
+
 /*
  * Structure used for stacked channel compression and decompression.
  */
@@ -88,6 +107,11 @@ typedef struct {
 				 * for compression on output, or
 				 * TCL_ZLIB_STREAM_INFLATE for decompression
 				 * on input. */
+    int format;			/* What format of data is going on the wire.
+				 * Needed so that the correct [fconfigure]
+				 * options can be enabled. */
+    int readAheadLimit;		/* The maximum number of bytes to read from
+				 * the underlying stream in one go. */
     z_stream inStream;		/* Structure used by zlib for decompression of
 				 * input. */
     z_stream outStream;		/* Structure used by zlib for compression of
@@ -101,6 +125,9 @@ typedef struct {
 				 * compressing a gzip stream. */
     Tcl_TimerToken timer;	/* Timer used for keeping events fresh. */
     Tcl_DString decompressed;	/* Buffer for decompression results. */
+    Tcl_Obj *compDictObj;	/* Byte-array object containing compression
+				 * dictionary (not dictObj!) to use if
+				 * necessary. */
 } ZlibChannelData;
 
 /*
@@ -117,10 +144,15 @@ typedef struct {
 #define OUT_HEADER		0x4
 
 /*
- * Size of buffers allocated by default. Should be enough...
+ * Size of buffers allocated by default, and the range it can be set to.  The
+ * same sorts of values apply to streams, except with different limits (they
+ * permit byte-level activity). Channels always use bytes unless told to use
+ * larger buffers.
  */
 
 #define DEFAULT_BUFFER_SIZE	4096
+#define MIN_NONSTREAM_BUFFER_SIZE 16
+#define MAX_BUFFER_SIZE		65536
 
 /*
  * Prototypes for private procedures defined later in this file:
@@ -138,19 +170,29 @@ static Tcl_DriverSetOptionProc	ZlibTransformSetOption;
 static Tcl_DriverWatchProc	ZlibTransformWatch;
 static Tcl_ObjCmdProc		ZlibCmd;
 static Tcl_ObjCmdProc		ZlibStreamCmd;
+static Tcl_ObjCmdProc		ZlibStreamAddCmd;
+static Tcl_ObjCmdProc		ZlibStreamHeaderCmd;
+static Tcl_ObjCmdProc		ZlibStreamPutCmd;
 
-static void		ConvertError(Tcl_Interp *interp, int code);
+static void		ConvertError(Tcl_Interp *interp, int code,
+			    uLong adler);
+static Tcl_Obj *	ConvertErrorToList(int code, uLong adler);
 static void		ExtractHeader(gz_header *headerPtr, Tcl_Obj *dictObj);
 static int		GenerateHeader(Tcl_Interp *interp, Tcl_Obj *dictObj,
 			    GzipHeader *headerPtr, int *extraSizePtr);
+static int		ZlibPushSubcmd(Tcl_Interp *interp, int objc,
+			    Tcl_Obj *const objv[]);
 static inline int	ResultCopy(ZlibChannelData *cd, char *buf,
 			    int toRead);
 static int		ResultGenerate(ZlibChannelData *cd, int n, int flush,
 			    int *errorCodePtr);
 static Tcl_Channel	ZlibStackChannelTransform(Tcl_Interp *interp,
-			    int mode, int format, int level,
-			    Tcl_Channel channel, Tcl_Obj *gzipHeaderDictPtr);
+			    int mode, int format, int level, int limit,
+			    Tcl_Channel channel, Tcl_Obj *gzipHeaderDictPtr,
+			    Tcl_Obj *compDictObj);
 static void		ZlibStreamCleanup(ZlibStreamHandle *zshPtr);
+static int		ZlibStreamSubcmd(Tcl_Interp *interp, int objc,
+			    Tcl_Obj *const objv[]);
 static inline void	ZlibTransformEventTimerKill(ZlibChannelData *cd);
 static void		ZlibTransformTimerRun(ClientData clientData);
 
@@ -198,38 +240,139 @@ static void
 ConvertError(
     Tcl_Interp *interp,		/* Interpreter to store the error in. May be
 				 * NULL, in which case nothing happens. */
-    int code)			/* The zlib error code. */
+    int code,			/* The zlib error code. */
+    uLong adler)		/* The checksum expected (for Z_NEED_DICT) */
 {
+    const char *codeStr, *codeStr2 = NULL;
+    char codeStrBuf[TCL_INTEGER_SPACE];
+
     if (interp == NULL) {
 	return;
     }
 
-    if (code == Z_ERRNO) {
+    switch (code) {
+	/*
+	 * Firstly, the case that is *different* because it's really coming
+	 * from the OS and is just being reported via zlib. It should be
+	 * really uncommon because Tcl handles all I/O rather than delegating
+	 * it to zlib, but proving it can't happen is hard.
+	 */
+
+    case Z_ERRNO:
 	Tcl_SetObjResult(interp, Tcl_NewStringObj(Tcl_PosixError(interp),-1));
-    } else {
-	const char *codeStr, *codeStr2 = NULL;
-	char codeStrBuf[TCL_INTEGER_SPACE];
-
-	switch (code) {
-	case Z_STREAM_ERROR:	codeStr = "STREAM";	break;
-	case Z_DATA_ERROR:	codeStr = "DATA";	break;
-	case Z_MEM_ERROR:	codeStr = "MEM";	break;
-	case Z_BUF_ERROR:	codeStr = "BUF";	break;
-	case Z_VERSION_ERROR:	codeStr = "VERSION";	break;
-	default:
-	    codeStr = "unknown";
-	    codeStr2 = codeStrBuf;
-	    sprintf(codeStrBuf, "%d", code);
-	    break;
-	}
-	Tcl_SetObjResult(interp, Tcl_NewStringObj(zError(code), -1));
+	return;
+
+	/*
+	 * Normal errors/conditions, some of which have additional detail and
+	 * some which don't. (This is not defined by array lookup because zlib
+	 * error codes are sometimes negative.)
+	 */
+
+    case Z_STREAM_ERROR:
+	codeStr = "STREAM";
+	break;
+    case Z_DATA_ERROR:
+	codeStr = "DATA";
+	break;
+    case Z_MEM_ERROR:
+	codeStr = "MEM";
+	break;
+    case Z_BUF_ERROR:
+	codeStr = "BUF";
+	break;
+    case Z_VERSION_ERROR:
+	codeStr = "VERSION";
+	break;
+    case Z_NEED_DICT:
+	codeStr = "NEED_DICT";
+	codeStr2 = codeStrBuf;
+	sprintf(codeStrBuf, "%lu", adler);
+	break;
+
+	/*
+	 * These should _not_ happen! This function is for dealing with error
+	 * cases, not non-errors!
+	 */
+
+    case Z_OK:
+	Tcl_Panic("unexpected zlib result in error handler: Z_OK");
+    case Z_STREAM_END:
+	Tcl_Panic("unexpected zlib result in error handler: Z_STREAM_END");
+
+	/*
+	 * Anything else is bad news; it's unexpected. Convert to generic
+	 * error.
+	 */
+
+    default:
+	codeStr = "UNKNOWN";
+	codeStr2 = codeStrBuf;
+	sprintf(codeStrBuf, "%d", code);
+	break;
+    }
+    Tcl_SetObjResult(interp, Tcl_NewStringObj(zError(code), -1));
+
+    /*
+     * Tricky point! We might pass NULL twice here (and will when the error
+     * type is known).
+     */
+
+    Tcl_SetErrorCode(interp, "TCL", "ZLIB", codeStr, codeStr2, NULL);
+}
+
+static Tcl_Obj *
+ConvertErrorToList(
+    int code,			/* The zlib error code. */
+    uLong adler)		/* The checksum expected (for Z_NEED_DICT) */
+{
+    Tcl_Obj *objv[4];
+
+    TclNewLiteralStringObj(objv[0], "TCL");
+    TclNewLiteralStringObj(objv[1], "ZLIB");
+    switch (code) {
+    case Z_STREAM_ERROR:
+	TclNewLiteralStringObj(objv[2], "STREAM");
+	return Tcl_NewListObj(3, objv);
+    case Z_DATA_ERROR:
+	TclNewLiteralStringObj(objv[2], "DATA");
+	return Tcl_NewListObj(3, objv);
+    case Z_MEM_ERROR:
+	TclNewLiteralStringObj(objv[2], "MEM");
+	return Tcl_NewListObj(3, objv);
+    case Z_BUF_ERROR:
+	TclNewLiteralStringObj(objv[2], "BUF");
+	return Tcl_NewListObj(3, objv);
+    case Z_VERSION_ERROR:
+	TclNewLiteralStringObj(objv[2], "VERSION");
+	return Tcl_NewListObj(3, objv);
+    case Z_ERRNO:
+	TclNewLiteralStringObj(objv[2], "POSIX");
+	objv[3] = Tcl_NewStringObj(Tcl_ErrnoId(), -1);
+	return Tcl_NewListObj(4, objv);
+    case Z_NEED_DICT:
+	TclNewLiteralStringObj(objv[2], "NEED_DICT");
+	objv[3] = Tcl_NewWideIntObj((Tcl_WideInt) adler);
+	return Tcl_NewListObj(4, objv);
+
+	/*
+	 * These should _not_ happen! This function is for dealing with error
+	 * cases, not non-errors!
+	 */
+
+    case Z_OK:
+	Tcl_Panic("unexpected zlib result in error handler: Z_OK");
+    case Z_STREAM_END:
+	Tcl_Panic("unexpected zlib result in error handler: Z_STREAM_END");
 
 	/*
-	 * Tricky point! We might pass NULL twice here (and will when the
-	 * error type is known).
+	 * Catch-all. Should be unreachable because all cases are already
+	 * listed above.
 	 */
 
-	Tcl_SetErrorCode(interp, "TCL", "ZLIB", codeStr, codeStr2, NULL);
+    default:
+	TclNewLiteralStringObj(objv[2], "UNKNOWN");
+	TclNewIntObj(objv[3], code);
+	return Tcl_NewListObj(4, objv);
     }
 }
 
@@ -301,7 +444,9 @@ GenerateHeader(
 		NULL);
 	headerPtr->nativeCommentBuf[len] = '\0';
 	headerPtr->header.comment = (Bytef *) headerPtr->nativeCommentBuf;
-	*extraSizePtr += len;
+	if (extraSizePtr != NULL) {
+	    *extraSizePtr += len;
+	}
     }
 
     if (GetValue(interp, dictObj, "crc", &value) != TCL_OK) {
@@ -319,7 +464,9 @@ GenerateHeader(
 		headerPtr->nativeFilenameBuf, MAXPATHLEN-1, NULL, &len, NULL);
 	headerPtr->nativeFilenameBuf[len] = '\0';
 	headerPtr->header.name = (Bytef *) headerPtr->nativeFilenameBuf;
-	*extraSizePtr += len;
+	if (extraSizePtr != NULL) {
+	    *extraSizePtr += len;
+	}
     }
 
     if (GetValue(interp, dictObj, "os", &value) != TCL_OK) {
@@ -441,6 +588,34 @@ ExtractHeader(
     }
 }
 
+static int
+SetInflateDictionary(
+    z_streamp strm,
+    Tcl_Obj *compDictObj)
+{
+    if (compDictObj != NULL) {
+	int length;
+	unsigned char *bytes = Tcl_GetByteArrayFromObj(compDictObj, &length);
+
+	return inflateSetDictionary(strm, bytes, (unsigned) length);
+    }
+    return Z_OK;
+}
+
+static int
+SetDeflateDictionary(
+    z_streamp strm,
+    Tcl_Obj *compDictObj)
+{
+    if (compDictObj != NULL) {
+	int length;
+	unsigned char *bytes = Tcl_GetByteArrayFromObj(compDictObj, &length);
+
+	return deflateSetDictionary(strm, bytes, (unsigned) length);
+    }
+    return Z_OK;
+}
+
 /*
  *----------------------------------------------------------------------
  *
@@ -479,6 +654,7 @@ Tcl_ZlibStreamInit(
     ZlibStreamHandle *zshPtr = NULL;
     Tcl_DString cmdname;
     Tcl_CmdInfo cmdinfo;
+    GzipHeader *gzHeaderPtr = NULL;
 
     switch (mode) {
     case TCL_ZLIB_STREAM_DEFLATE:
@@ -493,6 +669,15 @@ Tcl_ZlibStreamInit(
 	    break;
 	case TCL_ZLIB_FORMAT_GZIP:
 	    wbits = WBITS_GZIP;
+	    if (dictObj) {
+		gzHeaderPtr = ckalloc(sizeof(GzipHeader));
+		memset(gzHeaderPtr, 0, sizeof(GzipHeader));
+		if (GenerateHeader(interp, dictObj, gzHeaderPtr,
+			NULL) != TCL_OK) {
+		    ckfree(gzHeaderPtr);
+		    return TCL_ERROR;
+		}
+	    }
 	    break;
 	case TCL_ZLIB_FORMAT_ZLIB:
 	    wbits = WBITS_ZLIB;
@@ -519,6 +704,14 @@ Tcl_ZlibStreamInit(
 	    break;
 	case TCL_ZLIB_FORMAT_GZIP:
 	    wbits = WBITS_GZIP;
+	    gzHeaderPtr = ckalloc(sizeof(GzipHeader));
+	    memset(gzHeaderPtr, 0, sizeof(GzipHeader));
+	    gzHeaderPtr->header.name = (Bytef *)
+		    gzHeaderPtr->nativeFilenameBuf;
+	    gzHeaderPtr->header.name_max = MAXPATHLEN - 1;
+	    gzHeaderPtr->header.comment = (Bytef *)
+		    gzHeaderPtr->nativeCommentBuf;
+	    gzHeaderPtr->header.name_max = MAX_COMMENT_LEN - 1;
 	    break;
 	case TCL_ZLIB_FORMAT_ZLIB:
 	    wbits = WBITS_ZLIB;
@@ -545,6 +738,9 @@ Tcl_ZlibStreamInit(
     zshPtr->wbits = wbits;
     zshPtr->currentInput = NULL;
     zshPtr->streamEnd = 0;
+    zshPtr->compDictObj = NULL;
+    zshPtr->flags = 0;
+    zshPtr->gzHeaderPtr = gzHeaderPtr;
     memset(&zshPtr->stream, 0, sizeof(z_stream));
     zshPtr->stream.adler = 1;
 
@@ -555,12 +751,20 @@ Tcl_ZlibStreamInit(
     if (mode == TCL_ZLIB_STREAM_DEFLATE) {
 	e = deflateInit2(&zshPtr->stream, level, Z_DEFLATED, wbits,
 		MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY);
+	if (e == Z_OK && zshPtr->gzHeaderPtr) {
+	    e = deflateSetHeader(&zshPtr->stream,
+		    &zshPtr->gzHeaderPtr->header);
+	}
     } else {
 	e = inflateInit2(&zshPtr->stream, wbits);
+	if (e == Z_OK && zshPtr->gzHeaderPtr) {
+	    e = inflateGetHeader(&zshPtr->stream,
+		    &zshPtr->gzHeaderPtr->header);
+	}
     }
 
     if (e != Z_OK) {
-	ConvertError(interp, e);
+	ConvertError(interp, e, zshPtr->stream.adler);
 	goto error;
     }
 
@@ -620,7 +824,14 @@ Tcl_ZlibStreamInit(
     }
 
     return TCL_OK;
- error:
+
+  error:
+    if (zshPtr->compDictObj) {
+	Tcl_DecrRefCount(zshPtr->compDictObj);
+    }
+    if (zshPtr->gzHeaderPtr) {
+	ckfree(zshPtr->gzHeaderPtr);
+    }
     ckfree(zshPtr);
     return TCL_ERROR;
 }
@@ -728,6 +939,12 @@ ZlibStreamCleanup(
     if (zshPtr->currentInput) {
 	Tcl_DecrRefCount(zshPtr->currentInput);
     }
+    if (zshPtr->compDictObj) {
+	Tcl_DecrRefCount(zshPtr->compDictObj);
+    }
+    if (zshPtr->gzHeaderPtr) {
+	ckfree(zshPtr->gzHeaderPtr);
+    }
 
     ckfree(zshPtr);
 }
@@ -780,12 +997,24 @@ Tcl_ZlibStreamReset(
     if (zshPtr->mode == TCL_ZLIB_STREAM_DEFLATE) {
 	e = deflateInit2(&zshPtr->stream, zshPtr->level, Z_DEFLATED,
 		zshPtr->wbits, MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY);
+	if (e == Z_OK && HaveDictToSet(zshPtr)) {
+	    e = SetDeflateDictionary(&zshPtr->stream, zshPtr->compDictObj);
+	    if (e == Z_OK) {
+		DictWasSet(zshPtr);
+	    }
+	}
     } else {
 	e = inflateInit2(&zshPtr->stream, zshPtr->wbits);
+	if (IsRawStream(zshPtr) && HaveDictToSet(zshPtr) && e == Z_OK) {
+	    e = SetInflateDictionary(&zshPtr->stream, zshPtr->compDictObj);
+	    if (e == Z_OK) {
+		DictWasSet(zshPtr);
+	    }
+	}
     }
 
     if (e != Z_OK) {
-	ConvertError(zshPtr->interp, e);
+	ConvertError(zshPtr->interp, e, zshPtr->stream.adler);
 	/* TODO:cleanup */
 	return TCL_ERROR;
     }
@@ -878,6 +1107,41 @@ Tcl_ZlibStreamChecksum(
 /*
  *----------------------------------------------------------------------
  *
+ * Tcl_ZlibStreamSetCompressionDictionary --
+ *
+ *	Sets the compression dictionary for a stream. This will be used as
+ *	appropriate for the next compression or decompression action performed
+ *	on the stream.
+ *
+ *----------------------------------------------------------------------
+ */
+
+void
+Tcl_ZlibStreamSetCompressionDictionary(
+    Tcl_ZlibStream zshandle,
+    Tcl_Obj *compressionDictionaryObj)
+{
+    ZlibStreamHandle *zshPtr = (ZlibStreamHandle *) zshandle;
+
+    if (compressionDictionaryObj != NULL) {
+	if (Tcl_IsShared(compressionDictionaryObj)) {
+	    compressionDictionaryObj =
+		    Tcl_DuplicateObj(compressionDictionaryObj);
+	}
+	Tcl_IncrRefCount(compressionDictionaryObj);
+	zshPtr->flags |= DICT_TO_SET;
+    } else {
+	zshPtr->flags &= ~DICT_TO_SET;
+    }
+    if (zshPtr->compDictObj != NULL) {
+	Tcl_DecrRefCount(zshPtr->compDictObj);
+    }
+    zshPtr->compDictObj = compressionDictionaryObj;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
  * Tcl_ZlibStreamPut --
  *
  *	Add data to the stream for compression or decompression from a
@@ -911,6 +1175,17 @@ Tcl_ZlibStreamPut(
 	zshPtr->stream.next_in = Tcl_GetByteArrayFromObj(data, &size);
 	zshPtr->stream.avail_in = size;
 
+	if (HaveDictToSet(zshPtr)) {
+	    e = SetDeflateDictionary(&zshPtr->stream, zshPtr->compDictObj);
+	    if (e != Z_OK) {
+		if (zshPtr->interp) {
+		    ConvertError(zshPtr->interp, e, zshPtr->stream.adler);
+		}
+		return TCL_ERROR;
+	    }
+	    DictWasSet(zshPtr);
+	}
+
 	/*
 	 * Deflatebound doesn't seem to take various header sizes into
 	 * account, so we add 100 extra bytes.
@@ -948,6 +1223,12 @@ Tcl_ZlibStreamPut(
 
 	    e = deflate(&zshPtr->stream, flush);
 	}
+	if (e != Z_OK && !(flush==Z_FINISH && e==Z_STREAM_END)) {
+	    if (zshPtr->interp) {
+		ConvertError(zshPtr->interp, e, zshPtr->stream.adler);
+	    }
+	    return TCL_ERROR;
+	}
 
 	/*
 	 * And append the final data block.
@@ -1025,7 +1306,7 @@ Tcl_ZlibStreamGet(
 	     * panic for out of memory if we just kept growing the buffer.
 	     */
 
-	    count = 65536;
+	    count = MAX_BUFFER_SIZE;
 	}
 
 	/*
@@ -1073,7 +1354,30 @@ Tcl_ZlibStreamGet(
 	    }
 	}
 
+	/*
+	 * When dealing with a raw stream, we set the dictionary here, once.
+	 * (You can't do it in response to getting Z_NEED_DATA as raw streams
+	 * don't ever issue that.)
+	 */
+
+	if (IsRawStream(zshPtr) && HaveDictToSet(zshPtr)) {
+	    e = SetInflateDictionary(&zshPtr->stream, zshPtr->compDictObj);
+	    if (e != Z_OK) {
+		if (zshPtr->interp) {
+		    ConvertError(zshPtr->interp, e, zshPtr->stream.adler);
+		}
+		return TCL_ERROR;
+	    }
+	    DictWasSet(zshPtr);
+	}
 	e = inflate(&zshPtr->stream, zshPtr->flush);
+	if (e == Z_NEED_DICT && HaveDictToSet(zshPtr)) {
+	    e = SetInflateDictionary(&zshPtr->stream, zshPtr->compDictObj);
+	    if (e == Z_OK) {
+		DictWasSet(zshPtr);
+		e = inflate(&zshPtr->stream, zshPtr->flush);
+	    }
+	};
 	Tcl_ListObjLength(NULL, zshPtr->inData, &listLen);
 
 	while ((zshPtr->stream.avail_out > 0)
@@ -1127,7 +1431,14 @@ Tcl_ZlibStreamGet(
 	     * And call inflate again.
 	     */
 
-	    e = inflate(&zshPtr->stream, zshPtr->flush);
+	    do {
+		e = inflate(&zshPtr->stream, zshPtr->flush);
+		if (e != Z_NEED_DICT || !HaveDictToSet(zshPtr)) {
+		    break;
+		}
+		e = SetInflateDictionary(&zshPtr->stream,zshPtr->compDictObj);
+		DictWasSet(zshPtr);
+	    } while (e == Z_OK);
 	}
 	if (zshPtr->stream.avail_out > 0) {
 	    Tcl_SetByteArrayLength(data,
@@ -1135,7 +1446,7 @@ Tcl_ZlibStreamGet(
 	}
 	if (!(e==Z_OK || e==Z_STREAM_END || e==Z_BUF_ERROR)) {
 	    Tcl_SetByteArrayLength(data, existing);
-	    ConvertError(zshPtr->interp, e);
+	    ConvertError(zshPtr->interp, e, zshPtr->stream.adler);
 	    return TCL_ERROR;
 	}
 	if (e == Z_STREAM_END) {
@@ -1351,7 +1662,7 @@ Tcl_ZlibDeflate(
     return TCL_OK;
 
   error:
-    ConvertError(interp, e);
+    ConvertError(interp, e, stream.adler);
     TclDecrRefCount(obj);
     return TCL_ERROR;
 }
@@ -1530,7 +1841,7 @@ Tcl_ZlibInflate(
 
   error:
     TclDecrRefCount(obj);
-    ConvertError(interp, e);
+    ConvertError(interp, e, stream.adler);
     if (nameBuf) {
 	ckfree(nameBuf);
     }
@@ -1586,11 +1897,10 @@ ZlibCmd(
     int objc,
     Tcl_Obj *const objv[])
 {
-    int command, dlen, mode, format, i, option, level = -1;
+    int command, dlen, i, option, level = -1;
     unsigned start, buffersize = 0;
-    Tcl_ZlibStream zh;
     Byte *data;
-    Tcl_Obj *headerDictObj, *headerVarObj;
+    Tcl_Obj *headerDictObj;
     const char *extraInfoStr = NULL;
     static const char *const commands[] = {
 	"adler32", "compress", "crc32", "decompress", "deflate", "gunzip",
@@ -1601,14 +1911,6 @@ ZlibCmd(
 	CMD_ADLER, CMD_COMPRESS, CMD_CRC, CMD_DECOMPRESS, CMD_DEFLATE,
 	CMD_GUNZIP, CMD_GZIP, CMD_INFLATE, CMD_PUSH, CMD_STREAM
     };
-    static const char *const stream_formats[] = {
-	"compress", "decompress", "deflate", "gunzip", "gzip", "inflate",
-	NULL
-    };
-    enum zlibFormats {
-	FMT_COMPRESS, FMT_DECOMPRESS, FMT_DEFLATE, FMT_GUNZIP, FMT_GZIP,
-	FMT_INFLATE
-    };
 
     if (objc < 2) {
 	Tcl_WrongNumArgs(interp, 1, objv, "command arg ?...?");
@@ -1635,7 +1937,7 @@ ZlibCmd(
 	}
 	data = Tcl_GetByteArrayFromObj(objv[2], &dlen);
 	Tcl_SetObjResult(interp, Tcl_NewWideIntObj((Tcl_WideInt)
-		Tcl_ZlibAdler32(start, data, dlen)));
+		(uLong) Tcl_ZlibAdler32(start, data, dlen)));
 	return TCL_OK;
     case CMD_CRC:			/* crc32 str ?startvalue?
 					 * -> checksum */
@@ -1652,7 +1954,7 @@ ZlibCmd(
 	}
 	data = Tcl_GetByteArrayFromObj(objv[2], &dlen);
 	Tcl_SetObjResult(interp, Tcl_NewWideIntObj((Tcl_WideInt)
-		Tcl_ZlibCRC32(start, data, dlen)));
+		(uLong) Tcl_ZlibCRC32(start, data, dlen)));
 	return TCL_OK;
     case CMD_DEFLATE:			/* deflate data ?level?
 					 * -> rawCompressedData */
@@ -1688,12 +1990,27 @@ ZlibCmd(
 		NULL);
     case CMD_GZIP:			/* gzip data ?level?
 					 * -> gzippedCompressedData */
+	headerDictObj = NULL;
+
+	/*
+	 * Legacy argument format support.
+	 */
+
+	if (objc == 4
+		&& Tcl_GetIntFromObj(interp, objv[3], &level) == TCL_OK) {
+	    if (level < 0 || level > 9) {
+		extraInfoStr = "\n    (in -level option)";
+		goto badLevel;
+	    }
+	    return Tcl_ZlibDeflate(interp, TCL_ZLIB_FORMAT_GZIP, objv[2],
+		    level, NULL);
+	}
+
 	if (objc < 3 || objc > 7 || ((objc & 1) == 0)) {
 	    Tcl_WrongNumArgs(interp, 2, objv,
 		    "data ?-level level? ?-header header?");
 	    return TCL_ERROR;
 	}
-	headerDictObj = NULL;
 	for (i=3 ; i<objc ; i+=2) {
 	    static const char *const gzipopts[] = {
 		"-header", "-level", NULL
@@ -1732,7 +2049,8 @@ ZlibCmd(
 		    (int *) &buffersize) != TCL_OK) {
 		return TCL_ERROR;
 	    }
-	    if (buffersize < 16 || buffersize > 65536) {
+	    if (buffersize < MIN_NONSTREAM_BUFFER_SIZE
+		    || buffersize > MAX_BUFFER_SIZE) {
 		goto badBuffer;
 	    }
 	}
@@ -1750,14 +2068,17 @@ ZlibCmd(
 		    (int *) &buffersize) != TCL_OK) {
 		return TCL_ERROR;
 	    }
-	    if (buffersize < 16 || buffersize > 65536) {
+	    if (buffersize < MIN_NONSTREAM_BUFFER_SIZE
+		    || buffersize > MAX_BUFFER_SIZE) {
 		goto badBuffer;
 	    }
 	}
 	return Tcl_ZlibInflate(interp, TCL_ZLIB_FORMAT_ZLIB, objv[2],
 		buffersize, NULL);
-    case CMD_GUNZIP:			/* gunzip gzippeddata ?bufferSize?
+    case CMD_GUNZIP: {			/* gunzip gzippeddata ?bufferSize?
 					 *	-> decompressedData */
+	Tcl_Obj *headerVarObj;
+
 	if (objc < 3 || objc > 5 || ((objc & 1) == 0)) {
 	    Tcl_WrongNumArgs(interp, 2, objv, "data ?-headerVar varName?");
 	    return TCL_ERROR;
@@ -1778,7 +2099,8 @@ ZlibCmd(
 			(int *) &buffersize) != TCL_OK) {
 		    return TCL_ERROR;
 		}
-		if (buffersize < 16 || buffersize > 65536) {
+		if (buffersize < MIN_NONSTREAM_BUFFER_SIZE
+			|| buffersize > MAX_BUFFER_SIZE) {
 		    goto badBuffer;
 		}
 		break;
@@ -1803,209 +2125,353 @@ ZlibCmd(
 	    return TCL_ERROR;
 	}
 	return TCL_OK;
+    }
     case CMD_STREAM:			/* stream deflate/inflate/...gunzip \
-					 *    ?level?
+					 *    ?options...?
 					 *	-> handleCmd */
-	if (objc < 3 || objc > 4) {
-	    Tcl_WrongNumArgs(interp, 2, objv, "mode ?level?");
-	    return TCL_ERROR;
-	}
-	if (Tcl_GetIndexFromObj(interp, objv[2], stream_formats, "mode", 0,
-		&format) != TCL_OK) {
-	    return TCL_ERROR;
-	}
-	mode = TCL_ZLIB_STREAM_INFLATE;
-	switch ((enum zlibFormats) format) {
-	case FMT_DEFLATE:
-	    mode = TCL_ZLIB_STREAM_DEFLATE;
-	case FMT_INFLATE:
-	    format = TCL_ZLIB_FORMAT_RAW;
-	    break;
-	case FMT_COMPRESS:
-	    mode = TCL_ZLIB_STREAM_DEFLATE;
-	case FMT_DECOMPRESS:
-	    format = TCL_ZLIB_FORMAT_ZLIB;
-	    break;
-	case FMT_GZIP:
-	    mode = TCL_ZLIB_STREAM_DEFLATE;
-	case FMT_GUNZIP:
-	    format = TCL_ZLIB_FORMAT_GZIP;
-	    break;
-	}
-	if (objc == 4) {
-	    if (Tcl_GetIntFromObj(interp, objv[3],
-		    (int *) &level) != TCL_OK) {
-		return TCL_ERROR;
-	    }
-	    if (level < 0 || level > 9) {
-		goto badLevel;
-	    }
-	} else {
-	    level = Z_DEFAULT_COMPRESSION;
-	}
-	if (Tcl_ZlibStreamInit(interp, mode, format, level, NULL,
-		&zh) != TCL_OK) {
-	    return TCL_ERROR;
-	}
-	Tcl_SetObjResult(interp, Tcl_ZlibStreamGetCommandName(zh));
-	return TCL_OK;
-    case CMD_PUSH: {			/* push mode channel options...
+	return ZlibStreamSubcmd(interp, objc, objv);
+    case CMD_PUSH:			/* push mode channel options...
 					 *	-> channel */
-	Tcl_Channel chan;
-	int chanMode;
-	static const char *const pushOptions[] = {
-	    "-header", "-level", "-limit",
-	    NULL
-	};
-	enum pushOptions {poHeader, poLevel, poLimit};
-	Tcl_Obj *headerObj = NULL;
-	int limit = 1, dummy;
+	return ZlibPushSubcmd(interp, objc, objv);
+    };
 
-	if (objc < 4) {
-	    Tcl_WrongNumArgs(interp, 2, objv, "mode channel ?options...?");
-	    return TCL_ERROR;
-	}
+    return TCL_ERROR;
 
-	if (Tcl_GetIndexFromObj(interp, objv[2], stream_formats, "mode", 0,
-		&format) != TCL_OK) {
-	    return TCL_ERROR;
-	}
-	switch ((enum zlibFormats) format) {
-	case FMT_DEFLATE:
-	    mode = TCL_ZLIB_STREAM_DEFLATE;
-	    format = TCL_ZLIB_FORMAT_RAW;
-	    break;
-	case FMT_INFLATE:
-	    mode = TCL_ZLIB_STREAM_INFLATE;
-	    format = TCL_ZLIB_FORMAT_RAW;
-	    break;
-	case FMT_COMPRESS:
-	    mode = TCL_ZLIB_STREAM_DEFLATE;
-	    format = TCL_ZLIB_FORMAT_ZLIB;
-	    break;
-	case FMT_DECOMPRESS:
-	    mode = TCL_ZLIB_STREAM_INFLATE;
-	    format = TCL_ZLIB_FORMAT_ZLIB;
-	    break;
-	case FMT_GZIP:
-	    mode = TCL_ZLIB_STREAM_DEFLATE;
-	    format = TCL_ZLIB_FORMAT_GZIP;
-	    break;
-	case FMT_GUNZIP:
-	    mode = TCL_ZLIB_STREAM_INFLATE;
-	    format = TCL_ZLIB_FORMAT_GZIP;
-	    break;
-	default:
-	    Tcl_SetObjResult(interp, Tcl_NewStringObj("impossible!", -1));
-	    return TCL_ERROR;
-	}
+  badLevel:
+    Tcl_SetObjResult(interp, Tcl_NewStringObj("level must be 0 to 9", -1));
+    Tcl_SetErrorCode(interp, "TCL", "VALUE", "COMPRESSIONLEVEL", NULL);
+    if (extraInfoStr) {
+	Tcl_AddErrorInfo(interp, extraInfoStr);
+    }
+    return TCL_ERROR;
+  badBuffer:
+    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+	    "buffer size must be %d to %d",
+	    MIN_NONSTREAM_BUFFER_SIZE, MAX_BUFFER_SIZE));
+    Tcl_SetErrorCode(interp, "TCL", "VALUE", "BUFFERSIZE", NULL);
+    return TCL_ERROR;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * ZlibStreamSubcmd --
+ *
+ *	Implementation of the [zlib stream] subcommand.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static int
+ZlibStreamSubcmd(
+    Tcl_Interp *interp,
+    int objc,
+    Tcl_Obj *const objv[])
+{
+    static const char *const stream_formats[] = {
+	"compress", "decompress", "deflate", "gunzip", "gzip", "inflate",
+	NULL
+    };
+    enum zlibFormats {
+	FMT_COMPRESS, FMT_DECOMPRESS, FMT_DEFLATE, FMT_GUNZIP, FMT_GZIP,
+	FMT_INFLATE
+    };
+    int i, format, mode = 0, option, level;
+    typedef struct {
+	const char *name;
+	Tcl_Obj **valueVar;
+    } OptDescriptor;
+    Tcl_Obj *compDictObj = NULL;
+    Tcl_Obj *gzipHeaderObj = NULL;
+    Tcl_Obj *levelObj = NULL;
+    const OptDescriptor compressionOpts[] = {
+	{ "-dictionary", &compDictObj },
+	{ "-level", &levelObj },
+	{ NULL, NULL }
+    };
+    const OptDescriptor gzipOpts[] = {
+	{ "-header", &gzipHeaderObj },
+	{ "-level", &levelObj },
+	{ NULL, NULL }
+    };
+    const OptDescriptor expansionOpts[] = {
+	{ "-dictionary", &compDictObj },
+	{ NULL, NULL }
+    };
+    const OptDescriptor gunzipOpts[] = {
+	{ NULL, NULL }
+    };
+    const OptDescriptor *desc = NULL;
+    Tcl_ZlibStream zh;
 
-	if (TclGetChannelFromObj(interp, objv[3], &chan, &chanMode,
-		0) != TCL_OK) {
+    if (objc < 3 || !(objc & 1)) {
+	Tcl_WrongNumArgs(interp, 2, objv, "mode ?-option value...?");
+	return TCL_ERROR;
+    }
+    if (Tcl_GetIndexFromObj(interp, objv[2], stream_formats, "mode", 0,
+	    &format) != TCL_OK) {
+	return TCL_ERROR;
+    }
+
+    /*
+     * The format determines the compression mode and the options that may be
+     * specified.
+     */
+
+    switch ((enum zlibFormats) format) {
+    case FMT_DEFLATE:
+	desc = compressionOpts;
+	mode = TCL_ZLIB_STREAM_DEFLATE;
+	format = TCL_ZLIB_FORMAT_RAW;
+	break;
+    case FMT_INFLATE:
+	desc = expansionOpts;
+	mode = TCL_ZLIB_STREAM_INFLATE;
+	format = TCL_ZLIB_FORMAT_RAW;
+	break;
+    case FMT_COMPRESS:
+	desc = compressionOpts;
+	mode = TCL_ZLIB_STREAM_DEFLATE;
+	format = TCL_ZLIB_FORMAT_ZLIB;
+	break;
+    case FMT_DECOMPRESS:
+	desc = expansionOpts;
+	mode = TCL_ZLIB_STREAM_INFLATE;
+	format = TCL_ZLIB_FORMAT_ZLIB;
+	break;
+    case FMT_GZIP:
+	desc = gzipOpts;
+	mode = TCL_ZLIB_STREAM_DEFLATE;
+	format = TCL_ZLIB_FORMAT_GZIP;
+	break;
+    case FMT_GUNZIP:
+	desc = gunzipOpts;
+	mode = TCL_ZLIB_STREAM_INFLATE;
+	format = TCL_ZLIB_FORMAT_GZIP;
+	break;
+    default:
+	Tcl_Panic("should be unreachable");
+    }
+
+    /*
+     * Parse the options.
+     */
+
+    for (i=3 ; i<objc ; i+=2) {
+	if (Tcl_GetIndexFromObjStruct(interp, objv[i], desc,
+		sizeof(OptDescriptor), "option", 0, &option) != TCL_OK) {
 	    return TCL_ERROR;
 	}
+	*desc[option].valueVar = objv[i+1];
 
 	/*
-	 * Sanity checks.
+	 * Drop the cache on the option name; table address not constant.
 	 */
 
-	if (mode == TCL_ZLIB_STREAM_DEFLATE && !(chanMode & TCL_WRITABLE)) {
-	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
-		    "compression may only be applied to writable channels",
-		    -1));
-	    Tcl_SetErrorCode(interp, "TCL", "ZIP", "UNWRITABLE", NULL);
+	TclFreeIntRep(objv[i]);
+    }
+
+    /*
+     * If a compression level was given, parse it (integral: 0..9). Otherwise
+     * use the default.
+     */
+
+    if (levelObj == NULL) {
+	level = Z_DEFAULT_COMPRESSION;
+    } else if (Tcl_GetIntFromObj(interp, levelObj, &level) != TCL_OK) {
+	return TCL_ERROR;
+    } else if (level < 0 || level > 9) {
+	Tcl_SetObjResult(interp, Tcl_NewStringObj("level must be 0 to 9",-1));
+	Tcl_SetErrorCode(interp, "TCL", "VALUE", "COMPRESSIONLEVEL", NULL);
+	Tcl_AddErrorInfo(interp, "\n    (in -level option)");
+	return TCL_ERROR;
+    }
+
+    /*
+     * Construct the stream now we know its configuration.
+     */
+
+    if (Tcl_ZlibStreamInit(interp, mode, format, level, gzipHeaderObj,
+	    &zh) != TCL_OK) {
+	return TCL_ERROR;
+    }
+    if (compDictObj != NULL) {
+	Tcl_ZlibStreamSetCompressionDictionary(zh, compDictObj);
+    }
+    Tcl_SetObjResult(interp, Tcl_ZlibStreamGetCommandName(zh));
+    return TCL_OK;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * ZlibPushSubcmd --
+ *
+ *	Implementation of the [zlib push] subcommand.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static int
+ZlibPushSubcmd(
+    Tcl_Interp *interp,
+    int objc,
+    Tcl_Obj *const objv[])
+{
+    static const char *const stream_formats[] = {
+	"compress", "decompress", "deflate", "gunzip", "gzip", "inflate",
+	NULL
+    };
+    enum zlibFormats {
+	FMT_COMPRESS, FMT_DECOMPRESS, FMT_DEFLATE, FMT_GUNZIP, FMT_GZIP,
+	FMT_INFLATE
+    };
+    Tcl_Channel chan;
+    int chanMode, format, mode = 0, level, i, option;
+    static const char *const pushCompressOptions[] = {
+	"-dictionary", "-header", "-level", NULL
+    };
+    static const char *const pushDecompressOptions[] = {
+	"-dictionary", "-header", "-level", "-limit", NULL
+    };
+    const char *const *pushOptions = pushDecompressOptions;
+    enum pushOptions {poDictionary, poHeader, poLevel, poLimit};
+    Tcl_Obj *headerObj = NULL, *compDictObj = NULL;
+    int limit = 1, dummy;
+
+    if (objc < 4) {
+	Tcl_WrongNumArgs(interp, 2, objv, "mode channel ?options...?");
+	return TCL_ERROR;
+    }
+
+    if (Tcl_GetIndexFromObj(interp, objv[2], stream_formats, "mode", 0,
+	    &format) != TCL_OK) {
+	return TCL_ERROR;
+    }
+    switch ((enum zlibFormats) format) {
+    case FMT_DEFLATE:
+	mode = TCL_ZLIB_STREAM_DEFLATE;
+	format = TCL_ZLIB_FORMAT_RAW;
+	pushOptions = pushCompressOptions;
+	break;
+    case FMT_INFLATE:
+	mode = TCL_ZLIB_STREAM_INFLATE;
+	format = TCL_ZLIB_FORMAT_RAW;
+	break;
+    case FMT_COMPRESS:
+	mode = TCL_ZLIB_STREAM_DEFLATE;
+	format = TCL_ZLIB_FORMAT_ZLIB;
+	pushOptions = pushCompressOptions;
+	break;
+    case FMT_DECOMPRESS:
+	mode = TCL_ZLIB_STREAM_INFLATE;
+	format = TCL_ZLIB_FORMAT_ZLIB;
+	break;
+    case FMT_GZIP:
+	mode = TCL_ZLIB_STREAM_DEFLATE;
+	format = TCL_ZLIB_FORMAT_GZIP;
+	pushOptions = pushCompressOptions;
+	break;
+    case FMT_GUNZIP:
+	mode = TCL_ZLIB_STREAM_INFLATE;
+	format = TCL_ZLIB_FORMAT_GZIP;
+	break;
+    default:
+	Tcl_Panic("should be unreachable");
+    }
+
+    if (TclGetChannelFromObj(interp, objv[3], &chan, &chanMode, 0) != TCL_OK){
+	return TCL_ERROR;
+    }
+
+    /*
+     * Sanity checks.
+     */
+
+    if (mode == TCL_ZLIB_STREAM_DEFLATE && !(chanMode & TCL_WRITABLE)) {
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"compression may only be applied to writable channels", -1));
+	Tcl_SetErrorCode(interp, "TCL", "ZIP", "UNWRITABLE", NULL);
+	return TCL_ERROR;
+    }
+    if (mode == TCL_ZLIB_STREAM_INFLATE && !(chanMode & TCL_READABLE)) {
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"decompression may only be applied to readable channels",-1));
+	Tcl_SetErrorCode(interp, "TCL", "ZIP", "UNREADABLE", NULL);
+	return TCL_ERROR;
+    }
+
+    /*
+     * Parse options.
+     */
+
+    level = Z_DEFAULT_COMPRESSION;
+    for (i=4 ; i<objc ; i++) {
+	if (Tcl_GetIndexFromObj(interp, objv[i], pushOptions, "option", 0,
+		&option) != TCL_OK) {
 	    return TCL_ERROR;
 	}
-	if (mode == TCL_ZLIB_STREAM_INFLATE && !(chanMode & TCL_READABLE)) {
-	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
-		    "decompression may only be applied to readable channels",
-		    -1));
-	    Tcl_SetErrorCode(interp, "TCL", "ZIP", "UNREADABLE", NULL);
+	if (++i > objc-1) {
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "value missing for %s option", pushOptions[option]));
+	    Tcl_SetErrorCode(interp, "TCL", "ZIP", "NOVAL", NULL);
 	    return TCL_ERROR;
 	}
-
-	/*
-	 * Parse options.
-	 */
-
-	level = Z_DEFAULT_COMPRESSION;
-	for (i=4 ; i<objc ; i++) {
-	    if (Tcl_GetIndexFromObj(interp, objv[i], pushOptions, "option", 0,
-		    &option) != TCL_OK) {
-		return TCL_ERROR;
+	switch ((enum pushOptions) option) {
+	case poHeader:
+	    headerObj = objv[i];
+	    if (Tcl_DictObjSize(interp, headerObj, &dummy) != TCL_OK) {
+		goto genericOptionError;
 	    }
-	    switch ((enum pushOptions) option) {
-	    case poHeader:
-		if (++i > objc-1) {
-		    Tcl_SetObjResult(interp, Tcl_NewStringObj(
-			    "value missing for -header option", -1));
-		    Tcl_SetErrorCode(interp, "TCL", "ZIP", "NOVAL", NULL);
-		    return TCL_ERROR;
-		}
-		headerObj = objv[i];
-		if (Tcl_DictObjSize(interp, headerObj, &dummy) != TCL_OK) {
-		    Tcl_AddErrorInfo(interp, "\n    (in -header option)");
-		    return TCL_ERROR;
-		}
-		break;
-	    case poLevel:
-		if (++i > objc-1) {
-		    Tcl_SetObjResult(interp, Tcl_NewStringObj(
-			    "value missing for -level option", -1));
-		    Tcl_SetErrorCode(interp, "TCL", "ZIP", "NOVAL", NULL);
-		    return TCL_ERROR;
-		}
-		if (Tcl_GetIntFromObj(interp, objv[i],
-			(int *) &level) != TCL_OK) {
-		    Tcl_AddErrorInfo(interp, "\n    (in -level option)");
-		    return TCL_ERROR;
-		}
-		if (level < 0 || level > 9) {
-		    extraInfoStr = "\n    (in -level option)";
-		    goto badLevel;
-		}
-		break;
-	    case poLimit:
-		if (++i > objc-1) {
-		    Tcl_SetObjResult(interp, Tcl_NewStringObj(
-			    "value missing for -limit option", -1));
-		    Tcl_SetErrorCode(interp, "TCL", "ZIP", "NOVAL", NULL);
-		    return TCL_ERROR;
-		}
-		if (Tcl_GetIntFromObj(interp, objv[i],
-			(int *) &limit) != TCL_OK) {
-		    Tcl_AddErrorInfo(interp, "\n    (in -limit option)");
-		    return TCL_ERROR;
-		}
-		if (limit < 1) {
-		    limit = 1;
-		}
-		break;
+	    break;
+	case poLevel:
+	    if (Tcl_GetIntFromObj(interp, objv[i], (int*) &level) != TCL_OK) {
+		goto genericOptionError;
 	    }
+	    if (level < 0 || level > 9) {
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"level must be 0 to 9", -1));
+		Tcl_SetErrorCode(interp, "TCL", "VALUE", "COMPRESSIONLEVEL",
+			NULL);
+		goto genericOptionError;
+	    }
+	    break;
+	case poLimit:
+	    if (Tcl_GetIntFromObj(interp, objv[i], (int*) &limit) != TCL_OK) {
+		goto genericOptionError;
+	    }
+	    if (limit < 1 || limit > MAX_BUFFER_SIZE) {
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"read ahead limit must be 1 to %d",
+			MAX_BUFFER_SIZE));
+		Tcl_SetErrorCode(interp, "TCL", "VALUE", "BUFFERSIZE", NULL);
+		goto genericOptionError;
+	    }
+	    break;
+	case poDictionary:
+	    if (format == TCL_ZLIB_FORMAT_GZIP) {
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"a compression dictionary may not be set in the "
+			"gzip format", -1));
+		Tcl_SetErrorCode(interp, "TCL", "ZIP", "BADOPT", NULL);
+		goto genericOptionError;
+	    }
+	    compDictObj = objv[i];
+	    break;
 	}
-
-	if (ZlibStackChannelTransform(interp, mode, format, level, chan,
-		headerObj) == NULL) {
-	    return TCL_ERROR;
-	}
-	Tcl_SetObjResult(interp, objv[3]);
-	return TCL_OK;
     }
-    };
 
-    return TCL_ERROR;
-
-  badLevel:
-    Tcl_SetObjResult(interp, Tcl_NewStringObj("level must be 0 to 9", -1));
-    Tcl_SetErrorCode(interp, "TCL", "VALUE", "COMPRESSIONLEVEL", NULL);
-    if (extraInfoStr) {
-	Tcl_AddErrorInfo(interp, extraInfoStr);
+    if (ZlibStackChannelTransform(interp, mode, format, level, limit, chan,
+	    headerObj, compDictObj) == NULL) {
+	return TCL_ERROR;
     }
-    return TCL_ERROR;
-  badBuffer:
-    Tcl_SetObjResult(interp, Tcl_NewStringObj(
-	    "buffer size must be 32 to 65536", -1));
-    Tcl_SetErrorCode(interp, "TCL", "VALUE", "BUFFERSIZE", NULL);
+    Tcl_SetObjResult(interp, objv[3]);
+    return TCL_OK;
+
+  genericOptionError:
+    Tcl_AddErrorInfo(interp, "\n    (in ");
+    Tcl_AddErrorInfo(interp, pushOptions[option]);
+    Tcl_AddErrorInfo(interp, " option)");
     return TCL_ERROR;
 }
 
@@ -2027,22 +2493,16 @@ ZlibStreamCmd(
     Tcl_Obj *const objv[])
 {
     Tcl_ZlibStream zstream = cd;
-    int command, index, count, code, buffersize = -1, flush = -1, i;
+    int command, count, code;
     Tcl_Obj *obj;
     static const char *const cmds[] = {
 	"add", "checksum", "close", "eof", "finalize", "flush",
-	"fullflush", "get", "put", "reset",
+	"fullflush", "get", "header", "put", "reset",
 	NULL
     };
     enum zlibStreamCommands {
 	zs_add, zs_checksum, zs_close, zs_eof, zs_finalize, zs_flush,
-	zs_fullflush, zs_get, zs_put, zs_reset
-    };
-    static const char *const add_options[] = {
-	"-buffer", "-finalize", "-flush", "-fullflush", NULL
-    };
-    enum addOptions {
-	ao_buffer, ao_finalize, ao_flush, ao_fullflush
+	zs_fullflush, zs_get, zs_header, zs_put, zs_reset
     };
 
     if (objc < 2) {
@@ -2057,125 +2517,11 @@ ZlibStreamCmd(
 
     switch ((enum zlibStreamCommands) command) {
     case zs_add:		/* $strm add ?$flushopt? $data */
-	for (i=2; i<objc-1; i++) {
-	    if (Tcl_GetIndexFromObj(interp, objv[i], add_options, "option", 0,
-		    &index) != TCL_OK) {
-		return TCL_ERROR;
-	    }
-
-	    switch ((enum addOptions) index) {
-	    case ao_flush: /* -flush */
-		if (flush > -1) {
-		    flush = -2;
-		} else {
-		    flush = Z_SYNC_FLUSH;
-		}
-		break;
-	    case ao_fullflush: /* -fullflush */
-		if (flush > -1) {
-		    flush = -2;
-		} else {
-		    flush = Z_FULL_FLUSH;
-		}
-		break;
-	    case ao_finalize: /* -finalize */
-		if (flush > -1) {
-		    flush = -2;
-		} else {
-		    flush = Z_FINISH;
-		}
-		break;
-	    case ao_buffer: /* -buffer */
-		if (i == objc-2) {
-		    Tcl_SetObjResult(interp, Tcl_NewStringObj(
-			    "\"-buffer\" option must be followed by integer"
-			    " decompression buffersize", -1));
-		    Tcl_SetErrorCode(interp, "TCL", "ZIP", "NOVAL", NULL);
-		    return TCL_ERROR;
-		}
-		if (Tcl_GetIntFromObj(interp, objv[i+1],
-			&buffersize) != TCL_OK) {
-		    return TCL_ERROR;
-		}
-		if (buffersize < 1 || buffersize > 65536) {
-		    Tcl_SetObjResult(interp, Tcl_NewStringObj(
-			    "buffer size must be 32 to 65536", -1));
-		    Tcl_SetErrorCode(interp, "TCL", "VALUE", "BUFFERSIZE",
-			    NULL);
-		    return TCL_ERROR;
-		}
-	    }
-
-	    if (flush == -2) {
-		Tcl_SetObjResult(interp, Tcl_NewStringObj(
-			"\"-flush\", \"-fullflush\" and \"-finalize\" options"
-			" are mutually exclusive", -1));
-		Tcl_SetErrorCode(interp, "TCL", "ZIP", "EXCLUSIVE", NULL);
-		return TCL_ERROR;
-	    }
-	}
-	if (flush == -1) {
-	    flush = 0;
-	}
-
-	if (Tcl_ZlibStreamPut(zstream, objv[objc-1], flush) != TCL_OK) {
-	    return TCL_ERROR;
-	}
-	TclNewObj(obj);
-	code = Tcl_ZlibStreamGet(zstream, obj, buffersize);
-	if (code == TCL_OK) {
-	    Tcl_SetObjResult(interp, obj);
-	} else {
-	    TclDecrRefCount(obj);
-	}
-	return code;
-
+	return ZlibStreamAddCmd(zstream, interp, objc, objv);
+    case zs_header:		/* $strm header */
+	return ZlibStreamHeaderCmd(zstream, interp, objc, objv);
     case zs_put:		/* $strm put ?$flushopt? $data */
-	for (i=2; i<objc-1; i++) {
-	    if (Tcl_GetIndexFromObj(interp, objv[i], add_options, "option", 0,
-		    &index) != TCL_OK) {
-		return TCL_ERROR;
-	    }
-
-	    switch ((enum addOptions) index) {
-	    case ao_flush: /* -flush */
-		if (flush > -1) {
-		    flush = -2;
-		} else {
-		    flush = Z_SYNC_FLUSH;
-		}
-		break;
-	    case ao_fullflush: /* -fullflush */
-		if (flush > -1) {
-		    flush = -2;
-		} else {
-		    flush = Z_FULL_FLUSH;
-		}
-		break;
-	    case ao_finalize: /* -finalize */
-		if (flush > -1) {
-		    flush = -2;
-		} else {
-		    flush = Z_FINISH;
-		}
-		break;
-	    case ao_buffer:
-		Tcl_SetObjResult(interp, Tcl_NewStringObj(
-			"\"-buffer\" option not supported here", -1));
-		return TCL_ERROR;
-	    }
-	    if (flush == -2) {
-		Tcl_SetObjResult(interp, Tcl_NewStringObj(
-			"\"-flush\", \"-fullflush\" and \"-finalize\" options"
-			" are mutually exclusive", -1));
-		Tcl_SetErrorCode(interp, "TCL", "ZIP", "EXCLUSIVE", NULL);
-		return TCL_ERROR;
-	    }
-	}
-	if (flush == -1) {
-	    flush = 0;
-	}
-	return Tcl_ZlibStreamPut(zstream, objv[objc-1], flush);
+	return ZlibStreamPutCmd(zstream, interp, objc, objv);
 
     case zs_get:		/* $strm get ?count? */
 	if (objc > 3) {
@@ -2252,7 +2598,7 @@ ZlibStreamCmd(
 	    return TCL_ERROR;
 	}
 	Tcl_SetObjResult(interp, Tcl_NewWideIntObj((Tcl_WideInt)
-		Tcl_ZlibStreamChecksum(zstream)));
+		(uLong) Tcl_ZlibStreamChecksum(zstream)));
 	return TCL_OK;
     case zs_reset:		/* $strm reset */
 	if (objc != 2) {
@@ -2264,6 +2610,246 @@ ZlibStreamCmd(
 
     return TCL_OK;
 }
+
+static int
+ZlibStreamAddCmd(
+    ClientData cd,
+    Tcl_Interp *interp,
+    int objc,
+    Tcl_Obj *const objv[])
+{
+    Tcl_ZlibStream zstream = cd;
+    int index, code, buffersize = -1, flush = -1, i;
+    Tcl_Obj *obj, *compDictObj = NULL;
+    static const char *const add_options[] = {
+	"-buffer", "-dictionary", "-finalize", "-flush", "-fullflush", NULL
+    };
+    enum addOptions {
+	ao_buffer, ao_dictionary, ao_finalize, ao_flush, ao_fullflush
+    };
+
+    for (i=2; i<objc-1; i++) {
+	if (Tcl_GetIndexFromObj(interp, objv[i], add_options, "option", 0,
+		&index) != TCL_OK) {
+	    return TCL_ERROR;
+	}
+
+	switch ((enum addOptions) index) {
+	case ao_flush: /* -flush */
+	    if (flush > -1) {
+		flush = -2;
+	    } else {
+		flush = Z_SYNC_FLUSH;
+	    }
+	    break;
+	case ao_fullflush: /* -fullflush */
+	    if (flush > -1) {
+		flush = -2;
+	    } else {
+		flush = Z_FULL_FLUSH;
+	    }
+	    break;
+	case ao_finalize: /* -finalize */
+	    if (flush > -1) {
+		flush = -2;
+	    } else {
+		flush = Z_FINISH;
+	    }
+	    break;
+	case ao_buffer: /* -buffer */
+	    if (i == objc-2) {
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"\"-buffer\" option must be followed by integer "
+			"decompression buffersize", -1));
+		Tcl_SetErrorCode(interp, "TCL", "ZIP", "NOVAL", NULL);
+		return TCL_ERROR;
+	    }
+	    if (Tcl_GetIntFromObj(interp, objv[++i], &buffersize) != TCL_OK) {
+		return TCL_ERROR;
+	    }
+	    if (buffersize < 1 || buffersize > MAX_BUFFER_SIZE) {
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"buffer size must be 1 to %d",
+			MAX_BUFFER_SIZE));
+		Tcl_SetErrorCode(interp, "TCL", "VALUE", "BUFFERSIZE", NULL);
+		return TCL_ERROR;
+	    }
+	    break;
+	case ao_dictionary:
+	    if (i == objc-2) {
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"\"-dictionary\" option must be followed by"
+			" compression dictionary bytes", -1));
+		Tcl_SetErrorCode(interp, "TCL", "ZIP", "NOVAL", NULL);
+		return TCL_ERROR;
+	    }
+	    compDictObj = objv[++i];
+	    break;
+	}
+
+	if (flush == -2) {
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "\"-flush\", \"-fullflush\" and \"-finalize\" options"
+		    " are mutually exclusive", -1));
+	    Tcl_SetErrorCode(interp, "TCL", "ZIP", "EXCLUSIVE", NULL);
+	    return TCL_ERROR;
+	}
+    }
+    if (flush == -1) {
+	flush = 0;
+    }
+
+    /*
+     * Set the compression dictionary if requested.
+     */
+
+    if (compDictObj != NULL) {
+	int len;
+
+	(void) Tcl_GetByteArrayFromObj(compDictObj, &len);
+	if (len == 0) {
+	    compDictObj = NULL;
+	}
+	Tcl_ZlibStreamSetCompressionDictionary(zstream, compDictObj);
+    }
+
+    /*
+     * Send the data to the stream core, along with any flushing directive.
+     */
+
+    if (Tcl_ZlibStreamPut(zstream, objv[objc-1], flush) != TCL_OK) {
+	return TCL_ERROR;
+    }
+
+    /*
+     * Get such data out as we can (up to the requested length).
+     */
+
+    TclNewObj(obj);
+    code = Tcl_ZlibStreamGet(zstream, obj, buffersize);
+    if (code == TCL_OK) {
+	Tcl_SetObjResult(interp, obj);
+    } else {
+	TclDecrRefCount(obj);
+    }
+    return code;
+}
+
+static int
+ZlibStreamPutCmd(
+    ClientData cd,
+    Tcl_Interp *interp,
+    int objc,
+    Tcl_Obj *const objv[])
+{
+    Tcl_ZlibStream zstream = cd;
+    int index, flush = -1, i;
+    Tcl_Obj *compDictObj = NULL;
+    static const char *const put_options[] = {
+	"-dictionary", "-finalize", "-flush", "-fullflush", NULL
+    };
+    enum putOptions {
+	po_dictionary, po_finalize, po_flush, po_fullflush
+    };
+
+    for (i=2; i<objc-1; i++) {
+	if (Tcl_GetIndexFromObj(interp, objv[i], put_options, "option", 0,
+		&index) != TCL_OK) {
+	    return TCL_ERROR;
+	}
+
+	switch ((enum putOptions) index) {
+	case po_flush: /* -flush */
+	    if (flush > -1) {
+		flush = -2;
+	    } else {
+		flush = Z_SYNC_FLUSH;
+	    }
+	    break;
+	case po_fullflush: /* -fullflush */
+	    if (flush > -1) {
+		flush = -2;
+	    } else {
+		flush = Z_FULL_FLUSH;
+	    }
+	    break;
+	case po_finalize: /* -finalize */
+	    if (flush > -1) {
+		flush = -2;
+	    } else {
+		flush = Z_FINISH;
+	    }
+	    break;
+	case po_dictionary:
+	    if (i == objc-2) {
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"\"-dictionary\" option must be followed by"
+			" compression dictionary bytes", -1));
+		Tcl_SetErrorCode(interp, "TCL", "ZIP", "NOVAL", NULL);
+		return TCL_ERROR;
+	    }
+	    compDictObj = objv[++i];
+	    break;
+	}
+	if (flush == -2) {
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "\"-flush\", \"-fullflush\" and \"-finalize\" options"
+		    " are mutually exclusive", -1));
+	    Tcl_SetErrorCode(interp, "TCL", "ZIP", "EXCLUSIVE", NULL);
+	    return TCL_ERROR;
+	}
+    }
+    if (flush == -1) {
+	flush = 0;
+    }
+
+    /*
+     * Set the compression dictionary if requested.
+     */
+
+    if (compDictObj != NULL) {
+	int len;
+
+	(void) Tcl_GetByteArrayFromObj(compDictObj, &len);
+	if (len == 0) {
+	    compDictObj = NULL;
+	}
+	Tcl_ZlibStreamSetCompressionDictionary(zstream, compDictObj);
+    }
+
+    /*
+     * Send the data to the stream core, along with any flushing directive.
+     */
+
+    return Tcl_ZlibStreamPut(zstream, objv[objc-1], flush);
+}
+
+static int
+ZlibStreamHeaderCmd(
+    ClientData cd,
+    Tcl_Interp *interp,
+    int objc,
+    Tcl_Obj *const objv[])
+{
+    ZlibStreamHandle *zshPtr = cd;
+    Tcl_Obj *resultObj;
+
+    if (objc != 2) {
+	Tcl_WrongNumArgs(interp, 2, objv, NULL);
+	return TCL_ERROR;
+    } else if (zshPtr->mode != TCL_ZLIB_STREAM_INFLATE
+	    || zshPtr->format != TCL_ZLIB_FORMAT_GZIP) {
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"only gunzip streams can produce header information", -1));
+	Tcl_SetErrorCode(interp, "TCL", "ZIP", "BADOP", NULL);
+	return TCL_ERROR;
+    }
+
+    TclNewObj(resultObj);
+    ExtractHeader(&zshPtr->gzHeaderPtr->header, resultObj);
+    Tcl_SetObjResult(interp, resultObj);
+    return TCL_OK;
+}
 
 /*
  *----------------------------------------------------------------------
@@ -2304,7 +2890,7 @@ ZlibTransformClose(
 	    if (e != Z_OK && e != Z_STREAM_END) {
 		/* TODO: is this the right way to do errors on close? */
 		if (!TclInThreadExit()) {
-		    ConvertError(interp, e);
+		    ConvertError(interp, e, cd->outStream.adler);
 		}
 		result = TCL_ERROR;
 		break;
@@ -2315,12 +2901,10 @@ ZlibTransformClose(
 		    /* TODO: is this the right way to do errors on close?
 		     * Note: when close is called from FinalizeIOSubsystem
 		     * then interp may be NULL */
-		    if (!TclInThreadExit()) {
-			if (interp) {
-			    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
-				    "error while finalizing file: %s",
-				    Tcl_PosixError(interp)));
-			}
+		    if (!TclInThreadExit() && interp) {
+			Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+				"error while finalizing file: %s",
+				Tcl_PosixError(interp)));
 		    }
 		    result = TCL_ERROR;
 		    break;
@@ -2406,7 +2990,7 @@ ZlibTransformInput(
 	 * reading over the border.
 	 */
 
-	readBytes = Tcl_ReadRaw(cd->parent, cd->inBuffer, 1);
+	readBytes = Tcl_ReadRaw(cd->parent, cd->inBuffer, cd->readAheadLimit);
 
 	/*
 	 * Three cases here:
@@ -2520,6 +3104,7 @@ ZlibTransformOutput(
     Tcl_DriverOutputProc *outProc =
 	    Tcl_ChannelOutputProc(Tcl_GetChannelType(cd->parent));
     int e, produced;
+    Tcl_Obj *errObj;
 
     if (cd->mode == TCL_ZLIB_STREAM_INFLATE) {
 	return outProc(Tcl_GetChannelInstanceData(cd->parent), buf, toWrite,
@@ -2543,14 +3128,19 @@ ZlibTransformOutput(
 	}
     } while (e == Z_OK && produced > 0 && cd->outStream.avail_in > 0);
 
-    if (e != Z_OK) {
-	Tcl_SetChannelError(cd->parent,
-		Tcl_NewStringObj(cd->outStream.msg, -1));
-	*errorCodePtr = EINVAL;
-	return -1;
+    if (e == Z_OK) {
+	return toWrite - cd->outStream.avail_in;
     }
 
-    return toWrite - cd->outStream.avail_in;
+    errObj = Tcl_NewListObj(0, NULL);
+    Tcl_ListObjAppendElement(NULL, errObj, Tcl_NewStringObj("-errorcode",-1));
+    Tcl_ListObjAppendElement(NULL, errObj,
+	    ConvertErrorToList(e, cd->outStream.adler));
+    Tcl_ListObjAppendElement(NULL, errObj,
+	    Tcl_NewStringObj(cd->outStream.msg, -1));
+    Tcl_SetChannelError(cd->parent, errObj);
+    *errorCodePtr = EINVAL;
+    return -1;
 }
 
 /*
@@ -2573,58 +3163,113 @@ ZlibTransformSetOption(			/* not used */
     ZlibChannelData *cd = instanceData;
     Tcl_DriverSetOptionProc *setOptionProc =
 	    Tcl_ChannelSetOptionProc(Tcl_GetChannelType(cd->parent));
-    static const char *chanOptions = "flush";
+    static const char *compressChanOptions = "dictionary flush";
+    static const char *gzipChanOptions = "flush";
+    static const char *decompressChanOptions = "dictionary limit";
+    static const char *gunzipChanOptions = "flush limit";
     int haveFlushOpt = (cd->mode == TCL_ZLIB_STREAM_DEFLATE);
 
-    if (haveFlushOpt && optionName && strcmp(optionName, "-flush") == 0) {
-	int flushType;
+    if (optionName && (strcmp(optionName, "-dictionary") == 0)
+	    && (cd->format != TCL_ZLIB_FORMAT_GZIP)) {
+	Tcl_Obj *compDictObj;
+	int code;
 
-	if (value[0] == 'f' && strcmp(value, "full") == 0) {
-	    flushType = Z_FULL_FLUSH;
-	} else if (value[0] == 's' && strcmp(value, "sync") == 0) {
-	    flushType = Z_SYNC_FLUSH;
-	} else {
-	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
-		    "unknown -flush type \"%s\": must be full or sync",
-		    value));
-	    Tcl_SetErrorCode(interp, "TCL", "VALUE", "FLUSH", NULL);
-	    return TCL_ERROR;
+	TclNewStringObj(compDictObj, value, strlen(value));
+	Tcl_IncrRefCount(compDictObj);
+	(void) Tcl_GetByteArrayFromObj(compDictObj, NULL);
+	if (cd->compDictObj) {
+	    TclDecrRefCount(cd->compDictObj);
+	}
+	cd->compDictObj = compDictObj;
+	code = Z_OK;
+	if (cd->mode == TCL_ZLIB_STREAM_DEFLATE) {
+	    code = SetDeflateDictionary(&cd->outStream, compDictObj);
+	    if (code != Z_OK) {
+		ConvertError(interp, code, cd->outStream.adler);
+		return TCL_ERROR;
+	    }
+	} else if (cd->format == TCL_ZLIB_FORMAT_RAW) {
+	    code = SetInflateDictionary(&cd->inStream, compDictObj);
+	    if (code != Z_OK) {
+		ConvertError(interp, code, cd->inStream.adler);
+		return TCL_ERROR;
+	    }
 	}
+	return TCL_OK;
+    }
 
-	/*
-	 * Try to actually do the flush now.
-	 */
+    if (haveFlushOpt) {
+	if (optionName && strcmp(optionName, "-flush") == 0) {
+	    int flushType;
 
-	cd->outStream.avail_in = 0;
-	while (1) {
-	    int e;
+	    if (value[0] == 'f' && strcmp(value, "full") == 0) {
+		flushType = Z_FULL_FLUSH;
+	    } else if (value[0] == 's' && strcmp(value, "sync") == 0) {
+		flushType = Z_SYNC_FLUSH;
+	    } else {
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"unknown -flush type \"%s\": must be full or sync",
+			value));
+		Tcl_SetErrorCode(interp, "TCL", "VALUE", "FLUSH", NULL);
+		return TCL_ERROR;
+	    }
 
-	    cd->outStream.next_out = (Bytef *) cd->outBuffer;
-	    cd->outStream.avail_out = cd->outAllocated;
+	    /*
+	     * Try to actually do the flush now.
+	     */
 
-	    e = deflate(&cd->outStream, flushType);
-	    if (e == Z_BUF_ERROR) {
-		break;
-	    } else if (e != Z_OK) {
-		ConvertError(interp, e);
-		return TCL_ERROR;
-	    } else if (cd->outStream.avail_out == 0) {
-		break;
+	    cd->outStream.avail_in = 0;
+	    while (1) {
+		int e;
+
+		cd->outStream.next_out = (Bytef *) cd->outBuffer;
+		cd->outStream.avail_out = cd->outAllocated;
+
+		e = deflate(&cd->outStream, flushType);
+		if (e == Z_BUF_ERROR) {
+		    break;
+		} else if (e != Z_OK) {
+		    ConvertError(interp, e, cd->outStream.adler);
+		    return TCL_ERROR;
+		} else if (cd->outStream.avail_out == 0) {
+		    break;
+		}
+
+		if (Tcl_WriteRaw(cd->parent, cd->outBuffer,
+			cd->outStream.next_out - (Bytef *) cd->outBuffer)<0) {
+		    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			    "problem flushing channel: %s",
+			    Tcl_PosixError(interp)));
+		    return TCL_ERROR;
+		}
 	    }
+	    return TCL_OK;
+	}
+    } else {
+	if (optionName && strcmp(optionName, "-limit") == 0) {
+	    int newLimit;
 
-	    if (Tcl_WriteRaw(cd->parent, cd->outBuffer,
-		    cd->outStream.next_out - (Bytef *) cd->outBuffer) < 0) {
-		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
-			"problem flushing channel: %s",
-			Tcl_PosixError(interp)));
+	    if (Tcl_GetInt(interp, value, &newLimit) != TCL_OK) {
+		return TCL_ERROR;
+	    } else if (newLimit < 1 || newLimit > MAX_BUFFER_SIZE) {
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"-limit must be between 1 and 65536", -1));
+		Tcl_SetErrorCode(interp, "TCL", "VALUE", "READLIMIT", NULL);
 		return TCL_ERROR;
 	    }
 	}
-	return TCL_OK;
     }
 
     if (setOptionProc == NULL) {
-	return Tcl_BadChannelOption(interp, optionName, chanOptions);
+	if (cd->format == TCL_ZLIB_FORMAT_GZIP) {
+	    return Tcl_BadChannelOption(interp, optionName,
+		    (cd->mode == TCL_ZLIB_STREAM_DEFLATE)
+		    ? gzipChanOptions : gunzipChanOptions);
+	} else {
+	    return Tcl_BadChannelOption(interp, optionName,
+		    (cd->mode == TCL_ZLIB_STREAM_DEFLATE)
+		    ? compressChanOptions : decompressChanOptions);
+	}
     }
 
     /*
@@ -2656,7 +3301,10 @@ ZlibTransformGetOption(
     ZlibChannelData *cd = instanceData;
     Tcl_DriverGetOptionProc *getOptionProc =
 	    Tcl_ChannelGetOptionProc(Tcl_GetChannelType(cd->parent));
-    static const char *chanOptions = "checksum header";
+    static const char *compressChanOptions = "checksum dictionary";
+    static const char *gzipChanOptions = "checksum";
+    static const char *decompressChanOptions = "checksum dictionary limit";
+    static const char *gunzipChanOptions = "checksum header limit";
 
     /*
      * The "crc" option reports the current CRC (calculated with the Adler32
@@ -2684,6 +3332,28 @@ ZlibTransformGetOption(
 	}
     }
 
+    if ((cd->format != TCL_ZLIB_FORMAT_GZIP) &&
+	    (optionName == NULL || strcmp(optionName, "-dictionary") == 0)) {
+	/*
+	 * Embedded NUL bytes are ok; they'll be C080-encoded.
+	 */
+
+	if (optionName == NULL) {
+	    Tcl_DStringAppendElement(dsPtr, "-dictionary");
+	    if (cd->compDictObj) {
+		Tcl_DStringAppendElement(dsPtr,
+			Tcl_GetString(cd->compDictObj));
+	    } else {
+		Tcl_DStringAppendElement(dsPtr, "");
+	    }
+	} else {
+	    int len;
+	    const char *str = Tcl_GetStringFromObj(cd->compDictObj, &len);
+
+	    Tcl_DStringAppend(dsPtr, str, len);
+	}
+    }
+
     /*
      * The "header" option, which is only valid on inflating gzip channels,
      * reports the header that has been read from the start of the stream.
@@ -2716,7 +3386,15 @@ ZlibTransformGetOption(
     if (optionName == NULL) {
 	return TCL_OK;
     }
-    return Tcl_BadChannelOption(interp, optionName, chanOptions);
+    if (cd->format == TCL_ZLIB_FORMAT_GZIP) {
+	return Tcl_BadChannelOption(interp, optionName,
+		(cd->mode == TCL_ZLIB_STREAM_DEFLATE)
+		? gzipChanOptions : gunzipChanOptions);
+    } else {
+	return Tcl_BadChannelOption(interp, optionName,
+		(cd->mode == TCL_ZLIB_STREAM_DEFLATE)
+		? compressChanOptions : decompressChanOptions);
+    }
 }
 
 /*
@@ -2861,10 +3539,15 @@ ZlibStackChannelTransform(
 				 * decompressing transforms. */
     int level,			/* What compression level to use. Ignored for
 				 * decompressing transforms. */
+    int limit,			/* The limit on the number of bytes to read
+				 * ahead; always at least 1. */
     Tcl_Channel channel,	/* The channel to attach to. */
-    Tcl_Obj *gzipHeaderDictPtr)	/* A description of header to use, or NULL to
+    Tcl_Obj *gzipHeaderDictPtr,	/* A description of header to use, or NULL to
 				 * use a default. Ignored if not compressing
 				 * to produce gzip-format data. */
+    Tcl_Obj *compDictObj)	/* Byte-array object containing compression
+				 * dictionary (not dictObj!) to use if
+				 * necessary. */
 {
     ZlibChannelData *cd = ckalloc(sizeof(ZlibChannelData));
     Tcl_Channel chan;
@@ -2877,15 +3560,15 @@ ZlibStackChannelTransform(
 
     memset(cd, 0, sizeof(ZlibChannelData));
     cd->mode = mode;
+    cd->format = format;
+    cd->readAheadLimit = limit;
 
     if (format == TCL_ZLIB_FORMAT_GZIP || format == TCL_ZLIB_FORMAT_AUTO) {
 	if (mode == TCL_ZLIB_STREAM_DEFLATE) {
 	    if (gzipHeaderDictPtr) {
-		int dummy = 0;
-
 		cd->flags |= OUT_HEADER;
 		if (GenerateHeader(interp, gzipHeaderDictPtr, &cd->outHeader,
-			&dummy) != TCL_OK) {
+			NULL) != TCL_OK) {
 		    goto error;
 		}
 	    }
@@ -2900,6 +3583,12 @@ ZlibStackChannelTransform(
 	}
     }
 
+    if (compDictObj != NULL) {
+	cd->compDictObj = Tcl_DuplicateObj(compDictObj);
+	Tcl_IncrRefCount(cd->compDictObj);
+	Tcl_GetByteArrayFromObj(cd->compDictObj, NULL);
+    }
+
     if (format == TCL_ZLIB_FORMAT_RAW) {
 	wbits = WBITS_RAW;
     } else if (format == TCL_ZLIB_FORMAT_ZLIB) {
@@ -2929,6 +3618,14 @@ ZlibStackChannelTransform(
 		goto error;
 	    }
 	}
+	if (cd->format == TCL_ZLIB_FORMAT_RAW && cd->compDictObj) {
+	    e = SetInflateDictionary(&cd->inStream, cd->compDictObj);
+	    if (e != Z_OK) {
+		goto error;
+	    }
+	    TclDecrRefCount(cd->compDictObj);
+	    cd->compDictObj = NULL;
+	}
     } else {
 	e = deflateInit2(&cd->outStream, level, Z_DEFLATED, wbits,
 		MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY);
@@ -2943,6 +3640,12 @@ ZlibStackChannelTransform(
 		goto error;
 	    }
 	}
+	if (cd->compDictObj) {
+	    e = SetDeflateDictionary(&cd->outStream, cd->compDictObj);
+	    if (e != Z_OK) {
+		goto error;
+	    }
+	}
     }
 
     Tcl_DStringInit(&cd->decompressed);
@@ -2966,6 +3669,9 @@ ZlibStackChannelTransform(
 	ckfree(cd->outBuffer);
 	deflateEnd(&cd->outStream);
     }
+    if (cd->compDictObj) {
+	Tcl_DecrRefCount(cd->compDictObj);
+    }
     ckfree(cd);
     return NULL;
 }
@@ -3055,6 +3761,7 @@ ResultGenerate(
 #define MAXBUF	1024
     unsigned char buf[MAXBUF];
     int e, written;
+    Tcl_Obj *errObj;
 
     cd->inStream.next_in = (Bytef *) cd->inBuffer;
     cd->inStream.avail_in = n;
@@ -3064,6 +3771,18 @@ ResultGenerate(
 	cd->inStream.avail_out = MAXBUF;
 
 	e = inflate(&cd->inStream, flush);
+	if (e == Z_NEED_DICT && cd->compDictObj) {
+	    e = SetInflateDictionary(&cd->inStream, cd->compDictObj);
+	    if (e == Z_OK) {
+		/*
+		 * A repetition of Z_NEED_DICT is just an error.
+		 */
+
+		cd->inStream.next_out = (Bytef *) buf;
+		cd->inStream.avail_out = MAXBUF;
+		e = inflate(&cd->inStream, flush);
+	    }
+	}
 
 	/*
 	 * avail_out is now the left over space in the output.  Therefore
@@ -3095,13 +3814,7 @@ ResultGenerate(
 	 */
 
 	if ((e != Z_OK) && (e != Z_BUF_ERROR)) {
-	    Tcl_Obj *errObj = Tcl_NewListObj(0, NULL);
-
-	    Tcl_ListObjAppendElement(NULL, errObj,
-		    Tcl_NewStringObj(cd->inStream.msg, -1));
-	    Tcl_SetChannelError(cd->parent, errObj);
-	    *errorCodePtr = EINVAL;
-	    return TCL_ERROR;
+	    goto handleError;
 	}
 
 	/*
@@ -3112,6 +3825,17 @@ ResultGenerate(
 	    return TCL_OK;
 	}
     }
+
+  handleError:
+    errObj = Tcl_NewListObj(0, NULL);
+    Tcl_ListObjAppendElement(NULL, errObj, Tcl_NewStringObj("-errorcode",-1));
+    Tcl_ListObjAppendElement(NULL, errObj,
+	    ConvertErrorToList(e, cd->inStream.adler));
+    Tcl_ListObjAppendElement(NULL, errObj,
+	    Tcl_NewStringObj(cd->inStream.msg, -1));
+    Tcl_SetChannelError(cd->parent, errObj);
+    *errorCodePtr = EINVAL;
+    return TCL_ERROR;
 }
 
 /*
@@ -3124,6 +3848,8 @@ int
 TclZlibInit(
     Tcl_Interp *interp)
 {
+    Tcl_Config cfg[2];
+
     /*
      * This does two things. It creates a counter used in the creation of
      * stream commands, and it creates the namespace that will contain those
@@ -3137,6 +3863,23 @@ TclZlibInit(
      */
 
     Tcl_CreateObjCommand(interp, "zlib", ZlibCmd, 0, 0);
+
+    /*
+     * Store the underlying configuration information.
+     *
+     * TODO: Describe whether we're using the system version of the library or
+     * a compatibility version built into Tcl?
+     */
+
+    cfg[0].key = "zlibVersion";
+    cfg[0].value = zlibVersion();
+    cfg[1].key = NULL;
+    Tcl_RegisterConfig(interp, "zlib", cfg, "ascii");
+
+    /*
+     * Formally provide the package as a Tcl built-in.
+     */
+
     return Tcl_PkgProvide(interp, "zlib", TCL_ZLIB_VERSION);
 }
 
@@ -3258,6 +4001,14 @@ Tcl_ZlibAdler32(
 {
     return 0;
 }
+
+void
+Tcl_ZlibStreamSetCompressionDictionary(
+    Tcl_ZlibStream zshandle,
+    Tcl_Obj *compressionDictionaryObj)
+{
+    /* Do nothing. */
+}
 #endif /* HAVE_ZLIB */
 
 /*
diff --git a/library/dde/pkgIndex.tcl b/library/dde/pkgIndex.tcl
index ce8276b..8758bd2 100644
--- a/library/dde/pkgIndex.tcl
+++ b/library/dde/pkgIndex.tcl
@@ -1,7 +1,7 @@
 if {([info commands ::tcl::pkgconfig] eq "")
 	|| ([info sharedlibextension] ne ".dll")} return
 if {[::tcl::pkgconfig get debug]} {
-    package ifneeded dde 1.4.0b1 [list load [file join $dir tcldde14g.dll] dde]
+    package ifneeded dde 1.4.0b2 [list load [file join $dir tcldde14g.dll] dde]
 } else {
-    package ifneeded dde 1.4.0b1 [list load [file join $dir tcldde14.dll] dde]
+    package ifneeded dde 1.4.0b2 [list load [file join $dir tcldde14.dll] dde]
 }
diff --git a/library/init.tcl b/library/init.tcl
index 51c7f29..3ec78af 100644
--- a/library/init.tcl
+++ b/library/init.tcl
@@ -15,7 +15,7 @@
 if {[info commands package] == ""} {
     error "version mismatch: library\nscripts expect Tcl version 7.5b1 or later but the loaded version is\nonly [info patchlevel]"
 }
-package require -exact Tcl 8.6b2
+package require -exact Tcl 8.6b3
 
 # Compute the auto path to use in this interpreter.
 # The values on the path come from several locations:
diff --git a/library/msgcat/msgcat.tcl b/library/msgcat/msgcat.tcl
index 3377b47..112507a 100644
--- a/library/msgcat/msgcat.tcl
+++ b/library/msgcat/msgcat.tcl
@@ -13,11 +13,11 @@
 package require Tcl 8.5
 # When the version number changes, be sure to update the pkgIndex.tcl file,
 # and the installation directory in the Makefiles.
-package provide msgcat 1.4.5
+package provide msgcat 1.5.0
 
 namespace eval msgcat {
     namespace export mc mcload mclocale mcmax mcmset mcpreferences mcset \
-	    mcunknown
+	    mcunknown mcflset mcflmset
 
     # Records the current locale as passed to mclocale
     variable Locale ""
@@ -25,6 +25,9 @@ namespace eval msgcat {
     # Records the list of locales to search
     variable Loclist {}
 
+    # Records the locale of the currently sourced message catalogue file
+    variable FileLocale
+
     # Records the mapping between source strings and translated strings.  The
     # dict key is of the form "<locale> <namespace> <src>", where locale and
     # namespace should be themselves dict values and the value is
@@ -277,6 +280,11 @@ proc msgcat::mcpreferences {} {
 #	Returns the number of message catalogs that were loaded.
 
 proc msgcat::mcload {langdir} {
+    variable FileLocale
+    # Save the file locale if we are recursively called
+    if {[info exists FileLocale]} {
+	set nestedFileLocale $FileLocale
+    }
     set x 0
     foreach p [mcpreferences] {
 	if { $p eq {} } {
@@ -285,9 +293,17 @@ proc msgcat::mcload {langdir} {
 	set langfile [file join $langdir $p.msg]
 	if {[file exists $langfile]} {
 	    incr x
+	    set FileLocale [string tolower [file tail [file rootname $langfile]]]
+	    if {"root" eq $FileLocale} {
+		set FileLocale ""
+	    }
 	    uplevel 1 [list ::source -encoding utf-8 $langfile]
+	    unset FileLocale
 	}
     }
+    if {[info exists nestedFileLocale]} {
+	set FileLocale $nestedFileLocale
+    }
     return $x
 }
 
@@ -318,6 +334,35 @@ proc msgcat::mcset {locale src {dest ""}} {
     return $dest
 }
 
+# msgcat::mcflset --
+#
+#	Set the translation for a given string in the current file locale.
+#
+# Arguments:
+#	src		The source string.
+#	dest		(Optional) The translated string.  If omitted,
+#			the source string is used.
+#
+# Results:
+#	Returns the new locale.
+
+proc msgcat::mcflset {src {dest ""}} {
+    variable FileLocale
+    variable Msgs
+
+    if {![info exists FileLocale]} {
+	return -code error \
+	    "must only be used inside a message catalog loaded with ::msgcat::mcload"
+    }
+    if {[llength [info level 0]] == 2} { ;# dest not specified
+	set dest $src
+    }
+
+    set ns [uplevel 1 [list ::namespace current]]
+    dict set Msgs $FileLocale $ns $src $dest
+    return $dest
+}
+
 # msgcat::mcmset --
 #
 #	Set the translation for multiple strings in a specified locale.
@@ -345,7 +390,38 @@ proc msgcat::mcmset {locale pairs } {
 	dict set Msgs $locale $ns $src $dest
     }
 
-    return $length
+    return [expr {$length / 2}]
+}
+
+# msgcat::mcflmset --
+#
+#	Set the translation for multiple strings in the mc file locale.
+#
+# Arguments:
+#	pairs		One or more src/dest pairs (must be even length)
+#
+# Results:
+#	Returns the number of pairs processed
+
+proc msgcat::mcflmset {pairs} {
+    variable FileLocale
+    variable Msgs
+
+    if {![info exists FileLocale]} {
+	return -code error \
+	    "must only be used inside a message catalog loaded with ::msgcat::mcload"
+    }
+    set length [llength $pairs]
+    if {$length % 2} {
+	return -code error "bad translation list:\
+		should be \"[lindex [info level 0] 0] locale {src dest ...}\""
+    }
+
+    set ns [uplevel 1 [list ::namespace current]]
+    foreach {src dest} $pairs {
+	dict set Msgs $FileLocale $ns $src $dest
+    }
+    return [expr {$length / 2}]
 }
 
 # msgcat::mcunknown --
diff --git a/library/msgcat/pkgIndex.tcl b/library/msgcat/pkgIndex.tcl
index 60c2d3c..832bf81 100644
--- a/library/msgcat/pkgIndex.tcl
+++ b/library/msgcat/pkgIndex.tcl
@@ -1,2 +1,2 @@
 if {![package vsatisfies [package provide Tcl] 8.5]} {return}
-package ifneeded msgcat 1.4.5 [list source [file join $dir msgcat.tcl]]
+package ifneeded msgcat 1.5.0 [list source [file join $dir msgcat.tcl]]
diff --git a/library/msgs/uk.msg b/library/msgs/uk.msg
index 3e24f86..7d4c64a 100755
--- a/library/msgs/uk.msg
+++ b/library/msgs/uk.msg
@@ -33,7 +33,7 @@ namespace eval ::tcl::clock {
     ::msgcat::mcset uk MONTHS_FULL [list \
         "\u0441\u0456\u0447\u043d\u044f"\
         "\u043b\u044e\u0442\u043e\u0433\u043e"\
-        "\u0431\u0435\u0440\u0435\u0436\u043d\u044f"\
+        "\u0431\u0435\u0440\u0435\u0437\u043d\u044f"\
         "\u043a\u0432\u0456\u0442\u043d\u044f"\
         "\u0442\u0440\u0430\u0432\u043d\u044f"\
         "\u0447\u0435\u0440\u0432\u043d\u044f"\
diff --git a/macosx/tclMacOSXFCmd.c b/macosx/tclMacOSXFCmd.c
index 9193c1a..f266443 100644
--- a/macosx/tclMacOSXFCmd.c
+++ b/macosx/tclMacOSXFCmd.c
@@ -148,8 +148,9 @@ TclMacOSXGetFileAttribute(
     result = TclpObjStat(fileName, &statBuf);
 
     if (result != 0) {
-	Tcl_AppendResult(interp, "could not read \"", TclGetString(fileName),
-		"\": ", Tcl_PosixError(interp), NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"could not read \"%s\": %s",
+		TclGetString(fileName), Tcl_PosixError(interp)));
 	return TCL_ERROR;
     }
 
@@ -159,8 +160,8 @@ TclMacOSXGetFileAttribute(
 	 */
 
 	errno = EISDIR;
-	Tcl_AppendResult(interp, "invalid attribute: ",
-		Tcl_PosixError(interp), NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"invalid attribute: %s", Tcl_PosixError(interp)));
 	return TCL_ERROR;
     }
 
@@ -175,8 +176,9 @@ TclMacOSXGetFileAttribute(
     result = getattrlist(native, &alist, &finfo, sizeof(fileinfobuf), 0);
 
     if (result != 0) {
-	Tcl_AppendResult(interp, "could not read attributes of \"",
-		TclGetString(fileName), "\": ", Tcl_PosixError(interp), NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"could not read attributes of \"%s\": %s",
+		TclGetString(fileName), Tcl_PosixError(interp)));
 	return TCL_ERROR;
     }
 
@@ -199,10 +201,11 @@ TclMacOSXGetFileAttribute(
     }
     return TCL_OK;
 #else
-    Tcl_AppendResult(interp, "Mac OS X file attributes not supported", NULL);
+    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+	    "Mac OS X file attributes not supported", -1));
     Tcl_SetErrorCode(interp, "TCL", "UNSUPPORTED", NULL);
     return TCL_ERROR;
-#endif
+#endif /* HAVE_GETATTRLIST */
 }
 
 /*
@@ -241,8 +244,9 @@ TclMacOSXSetFileAttribute(
     result = TclpObjStat(fileName, &statBuf);
 
     if (result != 0) {
-	Tcl_AppendResult(interp, "could not read \"", TclGetString(fileName),
-		"\": ", Tcl_PosixError(interp), NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"could not read \"%s\": %s",
+		TclGetString(fileName), Tcl_PosixError(interp)));
 	return TCL_ERROR;
     }
 
@@ -252,8 +256,8 @@ TclMacOSXSetFileAttribute(
 	 */
 
 	errno = EISDIR;
-	Tcl_AppendResult(interp, "invalid attribute: ",
-		Tcl_PosixError(interp), NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"invalid attribute: %s", Tcl_PosixError(interp)));
 	return TCL_ERROR;
     }
 
@@ -268,8 +272,9 @@ TclMacOSXSetFileAttribute(
     result = getattrlist(native, &alist, &finfo, sizeof(fileinfobuf), 0);
 
     if (result != 0) {
-	Tcl_AppendResult(interp, "could not read attributes of \"",
-		TclGetString(fileName), "\": ", Tcl_PosixError(interp), NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"could not read attributes of \"%s\": %s",
+		TclGetString(fileName), Tcl_PosixError(interp)));
 	return TCL_ERROR;
     }
 
@@ -306,9 +311,9 @@ TclMacOSXSetFileAttribute(
 		&finfo.data, sizeof(finfo.data), 0);
 
 	if (result != 0) {
-	    Tcl_AppendResult(interp, "could not set attributes of \"",
-		    TclGetString(fileName), "\": ", Tcl_PosixError(interp),
-		    NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "could not set attributes of \"%s\": %s",
+		    TclGetString(fileName), Tcl_PosixError(interp)));
 	    return TCL_ERROR;
 	}
     } else {
@@ -328,8 +333,8 @@ TclMacOSXSetFileAttribute(
 	     */
 
 	    if (newRsrcForkSize != 0) {
-		Tcl_AppendResult(interp,
-			"setting nonzero rsrclength not supported", NULL);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"setting nonzero rsrclength not supported", -1));
 		Tcl_SetErrorCode(interp, "TCL", "UNSUPPORTED", NULL);
 		return TCL_ERROR;
 	    }
@@ -360,17 +365,17 @@ TclMacOSXSetFileAttribute(
 	    Tcl_DStringFree(&ds);
 
 	    if (result != 0) {
-		Tcl_AppendResult(interp,
-			"could not truncate resource fork of \"",
-			TclGetString(fileName), "\": ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"could not truncate resource fork of \"%s\": %s",
+			TclGetString(fileName), Tcl_PosixError(interp)));
 		return TCL_ERROR;
 	    }
 	}
     }
     return TCL_OK;
 #else
-    Tcl_AppendResult(interp, "Mac OS X file attributes not supported", NULL);
+    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+	    "Mac OS X file attributes not supported", -1));
     Tcl_SetErrorCode(interp, "TCL", "UNSUPPORTED", NULL);
     return TCL_ERROR;
 #endif
@@ -640,8 +645,8 @@ SetOSTypeFromAny(
 
     if (Tcl_DStringLength(&ds) > 4) {
 	if (interp) {
-	    Tcl_AppendResult(interp, "expected Macintosh OS type but got \"",
-		    string, "\": ", NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "expected Macintosh OS type but got \"%s\": ", string));
 	    Tcl_SetErrorCode(interp, "TCL", "VALUE", "MAC_OSTYPE", NULL);
 	}
 	result = TCL_ERROR;
diff --git a/pkgs/README b/pkgs/README
index e2b33f5..01c6f43 100644
--- a/pkgs/README
+++ b/pkgs/README
@@ -1 +1,57 @@
-Add notes here about bundling packages with Tcl.
+
+The 'pkgs' subdirectory of the Tcl source code distribution is meant to be
+a place where the source code distribution of Tcl packages may be placed so
+that they are built, installed, and tested along with Tcl.  As originally
+distributed, Tcl re-distributes a number of packages in this location.  The
+build systems for Tcl are written so that additional packages may be added,
+or the original packages removed in any number and still have all packages
+present get built, installed, and tested along with Tcl.
+
+In order for a package to work properly under the pkgs subdirectory, it
+needs to conform to the following conventions.
+
+  All files of the package need to be contained in (subdirs of ...) a
+  single subdirectory of the "pkgs" directrory.
+
+  In that subdirectory of "pkgs" there must be an executable file named
+  "configure".  When the program "configure" is run, it should generate
+  a file "Makefile" in the current working directory.  The "configure"
+  program should be able to accept as command line arguments all the
+  arguments that can be passed to the master unix/configure program.  It
+  should also accept the --with-tcl= and --with-tclinclude= options in
+  the conventional way.
+
+  The generated "Makefile" must be one suitable for controlling the operations
+  of a `make` program.  The following targets must be defined:
+
+    <default>:	Perform a build of the runtime components of the
+		package from sources.
+
+    install:	Copy the runtime components of the package into their
+		installed location.  Must respect the DESTDIR variable
+		for determining the installation location.
+
+    test:	Run the test suite of the package.  Must respect the
+		TCLSH_PROG, TESTFLAGS variables.
+
+    clean:	Delete all files generated by the default build target.
+
+    distclean:	Delete all generated files. 
+
+    dist:	Produce a copy of the package's source code distribution.
+		Must respect the DIST_ROOT variable determing where to
+		write the generated directory.
+
+Packages that are written to make use of the Tcl Extension Architecture (TEA)
+and that make use of the tclconfig collection of support files, should 
+conform to these conventions without further efforts.
+
+These conventions are subject to revision and refinement over time to
+better support the needs of the build system.  Efforts will be made to
+keep the TEA support scripts consistent with the demands of this system.
+
+In addition, it is requested that packages also support building with
+Microsoft Visual Studio tools.  This means the file win/makefile.vc
+should be included, suitable for use by the nmake program, defining the
+targets <default>, install, test, and clean.
+
diff --git a/tests/dict.test b/tests/dict.test
index 77bacf6..aa22c00 100644
--- a/tests/dict.test
+++ b/tests/dict.test
@@ -1521,6 +1521,268 @@ j
     }} [linenumber]}}
 } 5
 rename linenumber {}
+
+test dict-24.1 {dict map command: syntax} -returnCodes error -body {
+    dict map
+} -result {wrong # args: should be "dict map {keyVar valueVar} dictionary script"}
+test dict-24.2 {dict map command: syntax} -returnCodes error -body {
+    dict map x
+} -result {wrong # args: should be "dict map {keyVar valueVar} dictionary script"}
+test dict-24.3 {dict map command: syntax} -returnCodes error -body {
+    dict map x x
+} -result {wrong # args: should be "dict map {keyVar valueVar} dictionary script"}
+test dict-24.4 {dict map command: syntax} -returnCodes error -body {
+    dict map x x x x
+} -result {wrong # args: should be "dict map {keyVar valueVar} dictionary script"}
+test dict-24.5 {dict map command: syntax} -returnCodes error -body {
+    dict map x x x
+} -result {must have exactly two variable names}
+test dict-24.6 {dict map command: syntax} -returnCodes error -body {
+    dict map {x x x} x x
+} -result {must have exactly two variable names}
+test dict-24.7 {dict map command: syntax} -returnCodes error -body {
+    dict map "\{x" x x
+} -result {unmatched open brace in list}
+test dict-24.8 {dict map command} -setup {
+    set values {}
+    set keys {}
+} -body {
+    # This test confirms that [dict keys], [dict values] and [dict map]
+    # all traverse a dictionary in the same order.
+    set dictv {a A b B c C}
+    dict map {k v} $dictv {
+	lappend keys $k
+	lappend values $v
+    }
+    set result [expr {
+	$keys eq [dict keys $dictv] && $values eq [dict values $dictv]
+    }]
+    expr {$result ? "YES" : [list "NO" $dictv $keys $values]}
+} -cleanup {
+    unset result keys values k v dictv
+} -result YES
+test dict-24.9 {dict map command} {
+    dict map {k v} {} {
+	error "unexpected execution of 'dict map' body"
+    }
+} {}
+test dict-24.10 {dict map command: script results} -body {
+    set times 0
+    dict map {k v} {a a b b} {
+	incr times
+	continue
+	error "shouldn't get here"
+    }
+    return $times
+} -cleanup {
+    unset times k v
+} -result 2
+test dict-24.11 {dict map command: script results} -body {
+    set times 0
+    dict map {k v} {a a b b} {
+	incr times
+	break
+	error "shouldn't get here"
+    }
+    return $times
+} -cleanup {
+    unset times k v
+} -result 1
+test dict-24.12 {dict map command: script results} -body {
+    set times 0
+    list [catch {
+	dict map {k v} {a a b b} {
+	    incr times
+	    error test
+	}
+    } msg] $msg $times $::errorInfo
+} -cleanup {
+    unset times k v msg
+} -result {1 test 1 {test
+    while executing
+"error test"
+    ("dict map" body line 3)
+    invoked from within
+"dict map {k v} {a a b b} {
+	    incr times
+	    error test
+	}"}}
+test dict-24.13 {dict map command: script results} {
+    apply {{} {
+	dict map {k v} {a b} {
+	    return ok,$k,$v
+	    error "skipped return completely"
+	}
+	error "return didn't go far enough"
+    }}
+} ok,a,b
+test dict-24.14 {dict map command: handle representation loss} -setup {
+    set keys {}
+    set values {}
+} -body {
+    set dictVar {a b c d e f g h}
+    list [dict size [dict map {k v} $dictVar {
+	if {[llength $dictVar]} {
+	    lappend keys $k
+	    lappend values $v
+	    return -level 0 $k
+	}
+    }]] [lsort $keys] [lsort $values]
+} -cleanup {
+    unset dictVar keys values k v
+} -result {4 {a c e g} {b d f h}}
+test dict-24.14a {dict map command: handle representation loss} -body {
+    apply {{} {
+	set dictVar {a b c d e f g h}
+	list [dict size [dict map {k v} $dictVar {
+	    if {[llength $dictVar]} {
+		lappend keys $k
+		lappend values $v
+		return -level 0 $k
+	    }
+	}]] [lsort $keys] [lsort $values]
+    }}
+} -result {4 {a c e g} {b d f h}}
+test dict-24.15 {dict map command: keys are unique and iterated over once only} -setup {
+    unset -nocomplain accum
+    array set accum {}
+} -body {
+    set dictVar {a1 a a2 b b1 c b2 d foo bar bar foo}
+    dict map {k v} $dictVar {
+	append accum($k) $v,
+    }
+    set result [lsort [array names accum]]
+    lappend result :
+    foreach k $result {
+	catch {lappend result $accum($k)}
+    }
+    return $result
+} -cleanup {
+    unset dictVar k v result accum
+} -result {a1 a2 b1 b2 bar foo : a, b, c, d, foo, bar,}
+test dict-24.16 {dict map command in compilation context} {
+    apply {{} {
+	set res {x x x x x x}
+	dict map {k v} {a 0 b 1 c 2 d 3 e 4 f 5} {
+	    lset res $v $k
+	    continue
+	}
+	return $res
+    }}
+} {a b c d e f}
+test dict-24.17 {dict map command in compilation context} {
+    # Bug 1379349 (dict for)
+    apply {{} {
+	set d [dict create a 1]		;# Dict must be unshared!
+	dict map {k v} $d {
+	    dict set d $k 0		;# Any modification will do
+	}
+	return $d
+    }}
+} {a 0}
+test dict-24.17a {dict map command in compilation context} {
+    # Bug 1379349 (dict for)
+    apply {{} {
+	set d [dict create a 1]		;# Dict must be unshared!
+	dict map {k v} $d {
+	    dict set d $k 0		;# Any modification will do
+	}
+    }}
+} {a {a 0}}
+test dict-24.18 {dict map command in compilation context} {
+    # Bug 1382528 (dict for)
+    apply {{} {
+	dict map {k v} {} {}		;# Note empty dict
+	catch { error foo }		;# Note compiled [catch]
+    }}
+} 1
+test dict-24.19 {dict map and invalid dicts: 'dict for' bug 1531184} -body {
+    di[list]ct map {k v} x {}
+} -returnCodes 1 -result {missing value to go with key}
+test dict-24.20 {dict map stack space compilation: 'dict for' bug 1903325} {
+    apply {{x y args} {
+	dict map {a b} $x {}
+	concat "c=$y,$args"
+    }} {} 1 2 3
+} {c=1,2 3}
+proc linenumber {} {
+    dict get [info frame -1] line
+}
+test dict-24.20 {dict compilation crash: 'dict for' bug 3487626} {
+    apply {{} {apply {n {
+	set e {}
+	set k {}
+	dict map {a b} {c {d {e {f g}}}} {
+	    ::tcl::dict::map {h i} $b {
+		dict update i e j {
+		    ::tcl::dict::update j f k {
+			return [expr {$n - [linenumber]}]
+		    }
+		}
+	    }
+	}
+    }} [linenumber]}}
+} 5
+test dict-24.21 {dict compilation crash: 'dict for' bug 3487626} knownBug {
+    apply {{} {apply {n {
+	set e {}
+	set k {}
+	dict map {a {
+b
+}} {c {d {e {f g}}}} {
+	    ::tcl::dict::map {h {
+i
+}} ${
+b
+} {
+		dict update {
+i
+} e {
+j
+} {
+		    ::tcl::dict::update {
+j
+} f k {
+			return [expr {$n - [linenumber]}]
+		    }
+		}
+	    }
+	}
+    }} [linenumber]}}
+} 5
+rename linenumber {}
+test dict-24.22 {dict map results (non-compiled)} {
+    dict map {k v} [dict map {k v} {a 1 b 2 c 3 d 4} { list $v $k }] {
+	return -level 0 "$k,$v"
+    }
+} {a {a,1 a} b {b,2 b} c {c,3 c} d {d,4 d}}
+test dict-24.23 {dict map results (compiled)} {
+    apply {{} {
+	dict map {k v} [dict map {k v} {a 1 b 2 c 3 d 4} { list $v $k }] {
+	    return -level 0 "$k,$v"
+	}
+    }}
+} {a {a,1 a} b {b,2 b} c {c,3 c} d {d,4 d}}
+test dict-24.23a {dict map results (compiled)} {
+    apply {{list} {
+	dict map {k v} [dict map {k v} $list { list $v $k }] {
+	    return -level 0 "$k,$v"
+	}
+    }} {a 1 b 2 c 3 d 4}
+} {a {a,1 a} b {b,2 b} c {c,3 c} d {d,4 d}}
+test dict-24.24 {dict map with huge dict (non-compiled)} {
+    tcl::mathop::+ {*}[dict map {k v} [lsearch -all [lrepeat 100000 x] x] {
+	expr { $k * $v }
+    }]
+} 166666666600000
+test dict-24.25 {dict map with huge dict (compiled)} {
+    apply {{n} {
+	tcl::mathop::+ {*}[dict map {k v} [lsearch -all [lrepeat $n y] y] {
+	    expr { $k * $v }
+	}]
+    }} 100000
+} 166666666600000
+
 
 # cleanup
 ::tcltest::cleanupTests
diff --git a/tests/fileName.test b/tests/fileName.test
index 19503f8..51f00d1 100644
--- a/tests/fileName.test
+++ b/tests/fileName.test
@@ -199,7 +199,7 @@ test filename-4.12 {Tcl_SplitPath: unix} {testsetplatform} {
 test filename-4.13 {Tcl_SplitPath: unix} {testsetplatform} {
     testsetplatform unix
     file split //foo
-} "[file split //] foo"
+} "/ foo"
 test filename-4.14 {Tcl_SplitPath: unix} {testsetplatform} {
     testsetplatform unix
     file split foo//bar
@@ -436,11 +436,11 @@ test filename-7.16 {Tcl_JoinPath: unix} {testsetplatform} {
 test filename-7.17 {Tcl_JoinPath: unix} {testsetplatform} {
     testsetplatform unix
     file join //a b
-} "[file split //]a/b"
+} "/a/b"
 test filename-7.18 {Tcl_JoinPath: unix} {testsetplatform} {
     testsetplatform unix
     file join /// a b
-} "[file split //]a/b"
+} "/a/b"
 
 test filename-9.1 {Tcl_JoinPath: win} {testsetplatform} {
     testsetplatform win
@@ -749,7 +749,7 @@ test filename-11.13 {Tcl_GlobCmd} {
 } [file join $env(HOME)]
 set oldpwd [pwd]
 set oldhome $env(HOME)
-cd [temporaryDirectory]
+catch {cd [makeDirectory tcl[pid]]}
 set env(HOME) [pwd]
 file delete -force globTest
 file mkdir globTest/a1/b1
@@ -1616,6 +1616,7 @@ catch {file delete -force C:/globTest}
 cd [temporaryDirectory]
 file delete -force globTest
 cd $oldpwd
+catch {removeDirectory tcl[pid]}
 set env(HOME) $oldhome
 if {[testConstraint testsetplatform]} {
     testsetplatform $platform
diff --git a/tests/fileSystem.test b/tests/fileSystem.test
index 38ecbee..b098f35 100644
--- a/tests/fileSystem.test
+++ b/tests/fileSystem.test
@@ -27,7 +27,7 @@ catch {
     set ::ddelib [lindex [package ifneeded dde $::ddever] 1]
     set ::regver  [package require registry]
     set ::reglib [lindex [package ifneeded registry $::regver] 1]
-    testConstraint loaddll 0
+    testConstraint loaddll 1
 }
 
 # Test for commands defined in Tcltest executable
@@ -514,7 +514,7 @@ test filesystem-7.1.1 {load from vfs} -setup {
     set dir [pwd]
 } -constraints {win testsimplefilesystem loaddll} -body {
     # This may cause a crash on exit
-    cd [file dirname $::reglib]
+    cd [file dirname $::ddelib]
     testsimplefilesystem 1
     # This loads dde via a complex copy-to-temp operation
     load simplefs:/[file tail $::ddelib] dde
diff --git a/tests/foreach.test b/tests/foreach.test
index a4b652a..6c69b29 100644
--- a/tests/foreach.test
+++ b/tests/foreach.test
@@ -266,6 +266,15 @@ test foreach-10.1 {foreach: [Bug 1671087]} -setup {
     rename demo {}
 } -result {}
 
+test foreach-11.1 {error then dereference loop var (dev bug)} {
+  catch { foreach a 0 b {1 2 3} { error x } }
+  set a
+} 0
+test foreach-11.2 {error then dereference loop var (dev bug)} {
+  catch { foreach a 0 b {1 2 3} { incr a $b; error x } }
+  set a
+} 1
+
 # cleanup
 catch {unset a}
 catch {unset x}
diff --git a/tests/http.test b/tests/http.test
index fe44b47..bde5795 100644
--- a/tests/http.test
+++ b/tests/http.test
@@ -392,11 +392,19 @@ Content-Type {text/plain;charset=utf-8}
 Accept-Encoding .*
 Content-Length 5}
 test http-3.29 "http::geturl $ipv6url" -body {
-    set token [http::geturl $ipv6url -validate 1]
-    http::code $token
+    # We only want to see if the URL gets parsed correctly. This is
+    # the case if http::geturl succeeds or returns a socket related
+    # error. If the parsing is wrong, we'll get a parse error.
+    # It'd be better to separate the URL parser from http::geturl, so
+    # that it can be tested without also trying to make a connection.
+    set error [catch {http::geturl $ipv6url -validate 1} token]
+    if {$error && [string match "couldn't open socket: *" $token]} {
+            set error 0
+    }
+    set error
 } -cleanup {
-    http::cleanup $token
-} -result "HTTP/1.0 200 OK"
+    catch { http::cleanup $token }
+} -result 0
 
 test http-4.1 {http::Event} -body {
     set token [http::geturl $url -keepalive 0]
diff --git a/tests/ioTrans.test b/tests/ioTrans.test
index db9a2cb..7027ec1 100644
--- a/tests/ioTrans.test
+++ b/tests/ioTrans.test
@@ -283,6 +283,8 @@ test iortrans-3.1 {chan finalize, handler destruction has no effect on channel}
     lappend res [catch {close $c} msg] $msg
     lappend res [file channels file*]
     lappend res [file channels rt*]
+} -cleanup {
+    tempdone
 } -result {{initialize rt* {read write}} file* file* {} 1 {invalid command name "foo"} {} {}}
 test iortrans-3.2 {chan finalize, for close} -setup {
     set res {}
@@ -300,6 +302,7 @@ test iortrans-3.2 {chan finalize, for close} -setup {
     lappend res [info command foo]
 } -cleanup {
     rename foo {}
+    tempdone
 } -result {{initialize rt* {read write}} file* {finalize rt*} {} foo}
 test iortrans-3.3 {chan finalize, for close, error, close error} -setup {
     set res {}
@@ -315,6 +318,7 @@ test iortrans-3.3 {chan finalize, for close, error, close error} -setup {
     lappend res [file channels rt*]
 } -cleanup {
     rename foo {}
+    tempdone
 } -result {{initialize rt* {read write}} file* {finalize rt*} 1 5 {}}
 test iortrans-3.4 {chan finalize, for close, error, close error} -setup {
     set res {}
@@ -328,6 +332,7 @@ test iortrans-3.4 {chan finalize, for close, error, close error} -setup {
     lappend res [catch {close $c} msg] $msg $::errorInfo
 } -cleanup {
     rename foo {}
+    tempdone
 } -result {{initialize rt* {read write}} file* {finalize rt*} 1 FOO {FOO
 *"close $c"}}
 test iortrans-3.5 {chan finalize, for close, arbitrary result, ignored} -setup {
@@ -342,6 +347,7 @@ test iortrans-3.5 {chan finalize, for close, arbitrary result, ignored} -setup {
     lappend res [catch {close $c} msg] $msg
 } -cleanup {
     rename foo {}
+    tempdone
 } -result {{initialize rt* {read write}} file* {finalize rt*} 0 {}}
 test iortrans-3.6 {chan finalize, for close, break, close error} -setup {
     set res {}
@@ -355,6 +361,7 @@ test iortrans-3.6 {chan finalize, for close, break, close error} -setup {
     lappend res [catch {close $c} msg] $msg
 } -cleanup {
     rename foo {}
+    tempdone
 } -result {{initialize rt* {read write}} file* {finalize rt*} 1 *bad code*}
 test iortrans-3.7 {chan finalize, for close, continue, close error} -setup {
     set res {}
@@ -368,6 +375,7 @@ test iortrans-3.7 {chan finalize, for close, continue, close error} -setup {
     lappend res [catch {close $c} msg] $msg
 } -cleanup {
     rename foo {}
+    tempdone
 } -result {{initialize rt* {read write}} file* {finalize rt*} 1 *bad code*}
 test iortrans-3.8 {chan finalize, for close, custom code, close error} -setup {
     set res {}
@@ -381,6 +389,7 @@ test iortrans-3.8 {chan finalize, for close, custom code, close error} -setup {
     lappend res [catch {close $c} msg] $msg
 } -cleanup {
     rename foo {}
+    tempdone
 } -result {{initialize rt* {read write}} file* {finalize rt*} 1 *bad code*}
 test iortrans-3.9 {chan finalize, for close, ignore level, close error} -setup {
     set res {}
@@ -395,6 +404,7 @@ test iortrans-3.9 {chan finalize, for close, ignore level, close error} -setup {
     noteOpts $opt
 } -match glob -cleanup {
     rename foo {}
+    tempdone
 } -result {{initialize rt* {read write}} file* {finalize rt*} 1 *bad code* {-code 1 -level 0 -errorcode NONE -errorline 1 -errorinfo *bad code*subcommand "finalize"*}}
 
 # --- === *** ###########################
@@ -1036,6 +1046,8 @@ test iortrans-11.2 {delete interp of reflected transform} -setup {
 	chan event $c readable no-op
     }
     interp delete slave
+} -cleanup {
+    tempdone
 } -result {}
 
 # ### ### ### ######### ######### #########
diff --git a/tests/lmap.test b/tests/lmap.test
new file mode 100644
index 0000000..7baa77b
--- /dev/null
+++ b/tests/lmap.test
@@ -0,0 +1,464 @@
+# Commands covered:  lmap, continue, break
+#
+# This file contains a collection of tests for one or more of the Tcl
+# built-in commands.  Sourcing this file into Tcl runs the tests and
+# generates output for errors.  No output means no errors were found.
+#
+# Copyright (c) 1991-1993 The Regents of the University of California.
+# Copyright (c) 1994-1997 Sun Microsystems, Inc.
+# Copyright (c) 2011 Trevor Davel
+#
+# See the file "license.terms" for information on usage and redistribution
+# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+#
+# RCS: @(#) $Id: $
+
+if {"::tcltest" ni [namespace children]} {
+    package require tcltest 2
+    namespace import -force ::tcltest::*
+}
+
+unset -nocomplain a i x
+
+# ----- Non-compiled operation -----------------------------------------------
+
+# Basic "lmap" operation (non-compiled)
+test lmap-1.1 {basic lmap tests} {
+    set a {}
+    lmap i {a b c d} {
+	set a [concat $a $i]
+    }
+} {a {a b} {a b c} {a b c d}}
+test lmap-1.2 {basic lmap tests} {
+    lmap i {a b {{c d} e} {123 {{x}}}} {
+	set i
+    }
+} {a b {{c d} e} {123 {{x}}}}
+test lmap-1.2a {basic lmap tests} {
+    lmap i {a b {{c d} e} {123 {{x}}}} {
+	return -level 0 $i
+    }
+} {a b {{c d} e} {123 {{x}}}}
+test lmap-1.4 {basic lmap tests} -returnCodes error -body {
+    lmap
+} -result {wrong # args: should be "lmap varList list ?varList list ...? command"}
+test lmap-1.6 {basic lmap tests} -returnCodes error -body {
+    lmap i
+} -result {wrong # args: should be "lmap varList list ?varList list ...? command"}
+test lmap-1.8 {basic lmap tests} -returnCodes error -body {
+    lmap i j
+} -result {wrong # args: should be "lmap varList list ?varList list ...? command"}
+test lmap-1.10 {basic lmap tests} -returnCodes error -body {
+    lmap i j k l
+} -result {wrong # args: should be "lmap varList list ?varList list ...? command"}
+test lmap-1.11 {basic lmap tests} {
+    lmap i {} {
+	set i
+    }
+} {}
+test lmap-1.12 {basic lmap tests} {
+    lmap i {} {
+	return -level 0 x
+    }
+} {}
+test lmap-1.13 {lmap errors} -returnCodes error -body {
+    lmap {{a}{b}} {1 2 3} {}
+} -result {list element in braces followed by "{b}" instead of space}
+test lmap-1.14 {lmap errors} -returnCodes error -body {
+    lmap a {{1 2}3} {}
+} -result {list element in braces followed by "3" instead of space}
+unset -nocomplain a
+test lmap-1.15 {lmap errors} -setup {
+    unset -nocomplain a
+} -body {
+    set a(0) 44
+    list [catch {lmap a {1 2 3} {}} msg o] $msg $::errorInfo
+} -result {1 {can't set "a": variable is array} {can't set "a": variable is array
+    (setting lmap loop variable "a")
+    invoked from within
+"lmap a {1 2 3} {}"}}
+test lmap-1.16 {lmap errors} -returnCodes error -body {
+    lmap {} {} {}
+} -result {lmap varlist is empty}
+unset -nocomplain a
+
+# Parallel "lmap" operation (non-compiled)
+test lmap-2.1 {parallel lmap tests} {
+    lmap {a b} {1 2 3 4} {
+	list $b $a
+    }
+} {{2 1} {4 3}}
+test lmap-2.2 {parallel lmap tests} {
+    lmap {a b} {1 2 3 4 5} {
+	list $b $a
+    }
+} {{2 1} {4 3} {{} 5}}
+test lmap-2.3 {parallel lmap tests} {
+    lmap a {1 2 3} b {4 5 6} {
+	list $b $a
+    }
+} {{4 1} {5 2} {6 3}}
+test lmap-2.4 {parallel lmap tests} {
+    lmap a {1 2 3} b {4 5 6 7 8} {
+	list $b $a
+    }
+} {{4 1} {5 2} {6 3} {7 {}} {8 {}}}
+test lmap-2.5 {parallel lmap tests} {
+    lmap {a b} {a b A B aa bb} c {c C cc CC} {
+	list $a $b $c
+    }
+} {{a b c} {A B C} {aa bb cc} {{} {} CC}}
+test lmap-2.6 {parallel lmap tests} {
+    lmap a {1 2 3} b {1 2 3} c {1 2 3} d {1 2 3} e {1 2 3} {
+	list $a$b$c$d$e
+    }
+} {11111 22222 33333}
+test lmap-2.7 {parallel lmap tests} {
+    lmap a {} b {1 2 3} c {1 2} d {1 2 3 4} e {{1 2}} {
+	set x $a$b$c$d$e
+    }
+} {{1111 2} 222 33 4}
+test lmap-2.8 {parallel lmap tests} {
+    lmap a {} b {1 2 3} c {1 2} d {1 2 3 4} e {{1 2}} {
+	join [list $a $b $c $d $e] .
+    }
+} {{.1.1.1.1 2} .2.2.2. .3..3. ...4.}
+test lmap-2.9 {lmap only sets vars if repeating loop} {
+    namespace eval ::lmap_test {
+	set rgb {65535 0 0}
+	lmap {r g b} [set rgb] {}
+	set ::x "r=$r, g=$g, b=$b"
+    }
+    namespace delete ::lmap_test
+    set x
+} {r=65535, g=0, b=0}
+test lmap-2.10 {lmap only supports local scalar variables} -setup {
+    unset -nocomplain a
+} -body {
+    lmap {a(3)} {1 2 3 4} {set {a(3)}}
+} -result {1 2 3 4}
+unset -nocomplain a
+
+# "lmap" with "continue" and "break" (non-compiled)
+test lmap-3.1 {continue tests} {
+    lmap i {a b c d} {
+	if {[string compare $i "b"] == 0} continue
+	set i
+    }
+} {a c d}
+test lmap-3.2 {continue tests} {
+    set x 0
+    list [lmap i {a b c d} {
+    	incr x
+    	if {[string compare $i "b"] != 0} continue
+    	set i
+    }] $x
+} {b 4}
+test lmap-3.3 {break tests} {
+    set x 0
+    list [lmap i {a b c d} {
+	incr x
+    	if {[string compare $i "c"] == 0} break
+    	set i
+    }] $x
+} {{a b} 3}
+# Check for bug similar to #406709
+test lmap-3.4 {break tests} {
+    set a 1
+    lmap b b {list [concat a; break]; incr a}
+    incr a
+} {2}
+
+# ----- Compiled operation ---------------------------------------------------
+
+# Basic "lmap" operation (compiled)
+test lmap-4.1 {basic lmap tests} {
+    apply {{} {
+	set a {}
+	lmap i {a b c d} {
+	    set a [concat $a $i]
+	}
+    }}
+} {a {a b} {a b c} {a b c d}}
+test lmap-4.2 {basic lmap tests} {
+    apply {{} {
+	lmap i {a b {{c d} e} {123 {{x}}}} {
+	    set i
+	}
+    }}
+} {a b {{c d} e} {123 {{x}}}}
+test lmap-4.2a {basic lmap tests} {
+    apply {{} {
+	lmap i {a b {{c d} e} {123 {{x}}}} {
+	    return -level 0 $i
+	}
+    }}
+} {a b {{c d} e} {123 {{x}}}}
+test lmap-4.4 {basic lmap tests} -returnCodes error -body {
+    apply {{} { lmap }}
+} -result {wrong # args: should be "lmap varList list ?varList list ...? command"}
+test lmap-4.6 {basic lmap tests} -returnCodes error -body {
+    apply {{} { lmap i }}
+} -result {wrong # args: should be "lmap varList list ?varList list ...? command"}
+test lmap-4.8 {basic lmap tests} -returnCodes error -body {
+    apply {{} { lmap i j }}
+} -result {wrong # args: should be "lmap varList list ?varList list ...? command"}
+test lmap-4.10 {basic lmap tests} -returnCodes error -body {
+    apply {{} { lmap i j k l }}
+} -result {wrong # args: should be "lmap varList list ?varList list ...? command"}
+test lmap-4.11 {basic lmap tests} {
+    apply {{} { lmap i {} { set i } }}
+} {}
+test lmap-4.12 {basic lmap tests} {
+    apply {{} { lmap i {} { return -level 0 x } }}
+} {}
+test lmap-4.13 {lmap errors} -returnCodes error -body {
+    apply {{} { lmap {{a}{b}} {1 2 3} {} }}
+} -result {list element in braces followed by "{b}" instead of space}
+test lmap-4.14 {lmap errors} -returnCodes error -body {
+    apply {{} { lmap a {{1 2}3} {} }}
+} -result {list element in braces followed by "3" instead of space}
+unset -nocomplain a
+test lmap-4.15 {lmap errors} {
+    apply {{} { 
+	set a(0) 44
+	list [catch {lmap a {1 2 3} {}} msg o] $msg $::errorInfo 
+    }} 
+} {1 {can't set "a": variable is array} {can't set "a": variable is array
+    while executing
+"lmap a {1 2 3} {}"}}
+test lmap-4.16 {lmap errors} -returnCodes error -body {
+    apply {{} {
+	lmap {} {} {}
+    }}
+} -result {lmap varlist is empty}
+unset -nocomplain a
+
+# Parallel "lmap" operation (compiled)
+test lmap-5.1 {parallel lmap tests} {
+    apply {{} {
+	lmap {a b} {1 2 3 4} {
+	    list $b $a
+	}
+    }}
+} {{2 1} {4 3}}
+test lmap-5.2 {parallel lmap tests} {
+    apply {{} {
+	lmap {a b} {1 2 3 4 5} {
+	    list $b $a
+	}
+    }}
+} {{2 1} {4 3} {{} 5}}
+test lmap-5.3 {parallel lmap tests} {
+    apply {{} {
+	lmap a {1 2 3} b {4 5 6} {
+	    list $b $a
+	}
+    }}
+} {{4 1} {5 2} {6 3}}
+test lmap-5.4 {parallel lmap tests} {
+    apply {{} {
+	lmap a {1 2 3} b {4 5 6 7 8} {
+	    list $b $a
+	}
+    }}
+} {{4 1} {5 2} {6 3} {7 {}} {8 {}}}
+test lmap-5.5 {parallel lmap tests} {
+    apply {{} {
+	lmap {a b} {a b A B aa bb} c {c C cc CC} {
+	    list $a $b $c
+	}
+    }}
+} {{a b c} {A B C} {aa bb cc} {{} {} CC}}
+test lmap-5.6 {parallel lmap tests} {
+    apply {{} {
+	lmap a {1 2 3} b {1 2 3} c {1 2 3} d {1 2 3} e {1 2 3} {
+	    list $a$b$c$d$e
+	}
+    }}
+} {11111 22222 33333}
+test lmap-5.7 {parallel lmap tests} {
+    apply {{} {
+	lmap a {} b {1 2 3} c {1 2} d {1 2 3 4} e {{1 2}} {
+	    set x $a$b$c$d$e
+	}
+    }}
+} {{1111 2} 222 33 4}
+test lmap-5.8 {parallel lmap tests} {
+    apply {{} {
+	lmap a {} b {1 2 3} c {1 2} d {1 2 3 4} e {{1 2}} {
+	    join [list $a $b $c $d $e] .
+	}
+    }}
+} {{.1.1.1.1 2} .2.2.2. .3..3. ...4.}
+test lmap-5.9 {lmap only sets vars if repeating loop} {
+    apply {{} {
+        set rgb {65535 0 0}
+        lmap {r g b} [set rgb] {}
+        return "r=$r, g=$g, b=$b"
+    }}
+} {r=65535, g=0, b=0}
+test lmap-5.10 {lmap only supports local scalar variables} {
+    apply {{} {
+        lmap {a(3)} {1 2 3 4} {set {a(3)}}
+    }}
+} {1 2 3 4}
+
+# "lmap" with "continue" and "break" (compiled)
+test lmap-6.1 {continue tests} {
+    apply {{} {
+	lmap i {a b c d} {
+	    if {[string compare $i "b"] == 0} continue
+	    set i
+	}
+    }}
+} {a c d}
+test lmap-6.2 {continue tests} {
+    apply {{} {
+	list [lmap i {a b c d} {
+	    incr x
+	    if {[string compare $i "b"] != 0} continue
+	    set i
+	}] $x
+    }}
+} {b 4}
+test lmap-6.3 {break tests} {
+    apply {{} {
+	list [lmap i {a b c d} {
+	    incr x
+	    if {[string compare $i "c"] == 0} break
+	    set i
+	}] $x
+    }}
+} {{a b} 3}
+# Check for bug similar to #406709
+test lmap-6.4 {break tests} {
+    apply {{} {
+	set a 1
+	lmap b b {list [concat a; break]; incr a}
+	incr a
+    }}
+} {2}
+
+# ----- Special cases and bugs -----------------------------------------------
+test lmap-7.1 {compiled lmap backward jump works correctly} -setup {
+    unset -nocomplain x
+} -body {
+    array set x {0 zero 1 one 2 two 3 three}
+    lsort [apply {{arrayName} {
+        upvar 1 $arrayName a
+        lmap member [array names a] {
+            list $member [set a($member)]
+        }
+    }} x]
+} -result [lsort {{0 zero} {1 one} {2 two} {3 three}}]
+test lmap-7.2 {noncompiled lmap and shared variable or value list objects that are converted to another type} -setup {
+    unset -nocomplain x
+} -body {
+    lmap {12.0} {a b c} {
+        set x 12.0
+        set x [expr $x + 1]
+    }
+} -result {13.0 13.0 13.0}
+# Test for incorrect "double evaluation" semantics
+test lmap-7.3 {delayed substitution of body} {
+    apply {{} {
+       set a 0
+       lmap a [list 1 2 3] "
+           set x $a
+       "
+       return $x
+    }}
+} {0}
+# Related to "foreach" test for [Bug 1189274]; crash on failure
+test lmap-7.4 {empty list handling} {
+    proc crash {} {
+	rename crash {}
+	set a "x y z"
+	set b ""
+	lmap aa $a bb $b { set x "aa = $aa bb = $bb" }
+    }
+    crash
+} {{aa = x bb = } {aa = y bb = } {aa = z bb = }}
+# Related to [Bug 1671138]; infinite loop with empty var list in bytecompiled
+# version.
+test lmap-7.5 {compiled empty var list} -returnCodes error -body {
+    proc foo {} {
+	lmap {} x {
+	    error "reached body"
+	}
+    }
+    foo
+} -cleanup {
+    catch {rename foo ""}
+} -result {lmap varlist is empty}
+test lmap-7.6 {lmap: related to "foreach" [Bug 1671087]} -setup {
+    proc demo {} {
+	set vals {1 2 3 4}
+	trace add variable x write {string length $vals ;# }
+	lmap {x y} $vals {format $y}
+    }
+} -body {
+    demo
+} -cleanup {
+    rename demo {}
+} -result {2 4}
+# Huge lists must not overflow the bytecode interpreter (development bug)
+test lmap-7.7 {huge list non-compiled} {
+    set x [lmap a [lrepeat 1000000 x] { set b y$a }]
+    list $b [llength $x] [string length $x]
+} {yx 1000000 2999999}
+test lmap-7.8 {huge list compiled} {
+    set x [apply {{times} { lmap a [lrepeat $times x] { set b y$a }}} 1000000]
+    list $b [llength $x] [string length $x]
+} {yx 1000000 2999999}
+test lmap-7.9 {error then dereference loop var (dev bug)} {
+    catch { lmap a 0 b {1 2 3} { error x } }
+    set a
+} 0
+test lmap-7.9a {error then dereference loop var (dev bug)} {
+    catch { lmap a 0 b {1 2 3} { incr a $b; error x } }
+    set a
+} 1
+
+# ----- Coroutines -----------------------------------------------------------
+test lmap-8.1 {lmap non-compiled with coroutines} -body {
+    coroutine coro apply {{} {
+	set values [yield [info coroutine]]
+	eval lmap i [list $values] {{ yield $i }}
+    }} ;# returns 'coro'
+    coro {a b c d e f} ;# -> a
+    coro 1 ;# -> b
+    coro 2 ;# -> c
+    coro 3 ;# -> d
+    coro 4 ;# -> e
+    coro 5 ;# -> f
+    list [coro 6] [info commands coro]
+} -cleanup {
+    catch {rename coro ""}
+} -result {{1 2 3 4 5 6} {}}
+test lmap-8.2 {lmap compiled with coroutines} -body {
+    coroutine coro apply {{} {
+	set values [yield [info coroutine]]
+	lmap i $values { yield $i }
+    }} ;# returns 'coro'
+    coro {a b c d e f} ;# -> a
+    coro 1 ;# -> b
+    coro 2 ;# -> c
+    coro 3 ;# -> d
+    coro 4 ;# -> e
+    coro 5 ;# -> f
+    list [coro 6] [info commands coro]
+} -cleanup {
+    catch {rename coro ""}
+} -result {{1 2 3 4 5 6} {}}
+
+# cleanup
+unset -nocomplain a x
+catch {rename foo {}}
+::tcltest::cleanupTests
+return
+
+# Local Variables:
+# mode: tcl
+# End:
diff --git a/tests/msgcat.test b/tests/msgcat.test
index bbcd023..1522354 100644
--- a/tests/msgcat.test
+++ b/tests/msgcat.test
@@ -17,8 +17,8 @@ if {[catch {package require tcltest 2}]} {
     puts stderr "Skipping tests in [info script].  tcltest 2 required."
     return
 }
-if {[catch {package require msgcat 1.4.5}]} {
-    puts stderr "Skipping tests in [info script].  No msgcat 1.4.5 found to test."
+if {[catch {package require msgcat 1.5.0}]} {
+    puts stderr "Skipping tests in [info script].  No msgcat 1.5.0 found to test."
     return
 }
 
@@ -56,6 +56,13 @@ namespace eval ::msgcat::test {
 		set result [string tolower \
 			[msgcat::ConvertLocale $::tcl::mac::locale]]
 	    } else {
+		if {([info sharedlibextension] == ".dll")
+			&& ![catch {package require registry}]} {
+		    # Windows and Cygwin have other ways to determine the
+		    # locale when the environment variables are missing
+		    # and the registry package is present
+		    continue
+		}
 		set result c
 	    }
 	}
@@ -611,6 +618,45 @@ namespace eval ::msgcat::test {
 	mc "this is a %s" "good test"
     } -result "this is a good test"
 
+    # Tests msgcat-8.*: [mcflset]
+
+    set msgdir1 [makeDirectory msgdir1]
+    makeFile {::msgcat::mcflset k1 v1} l1.msg $msgdir1
+
+	test msgcat-8.1 {mcflset} -setup {
+	    variable locale [mclocale]
+	    mclocale l1
+	    mcload $msgdir1
+	} -cleanup {
+	    mclocale $locale
+	} -body {
+	    mc k1
+	} -result v1
+
+    removeFile l1.msg $msgdir1
+    removeDirectory msgdir1
+
+    set msgdir2 [makeDirectory msgdir2]
+    set msgdir3 [makeDirectory msgdir3]
+    makeFile "::msgcat::mcflset k2 v2 ; ::msgcat::mcload [list $msgdir3]"\
+	    l2.msg $msgdir2
+    makeFile {::msgcat::mcflset k3 v3} l2.msg $msgdir3
+
+	# chained mcload
+	test msgcat-8.2 {mcflset} -setup {
+	    variable locale [mclocale]
+	    mclocale l2
+	    mcload $msgdir2
+	} -cleanup {
+	    mclocale $locale
+	} -body {
+	    return [mc k2][mc k3]
+	} -result v2v3
+
+    removeFile l2.msg $msgdir2
+    removeDirectory msgdir2
+    removeDirectory msgdir3
+
     cleanupTests
 }
 namespace delete ::msgcat::test
diff --git a/tests/oo.test b/tests/oo.test
index 00663e9..540cdf3 100644
--- a/tests/oo.test
+++ b/tests/oo.test
@@ -2,12 +2,12 @@
 # Sourcing this file into Tcl runs the tests and generates output for errors.
 # No output means no errors were found.
 #
-# Copyright (c) 2006-2011 Donal K. Fellows
+# Copyright (c) 2006-2012 Donal K. Fellows
 #
 # See the file "license.terms" for information on usage and redistribution of
 # this file, and for a DISCLAIMER OF ALL WARRANTIES.
 
-package require -exact TclOO 0.6.3 ;# Must match value in generic/tclOO.h
+package require -exact TclOO 0.7 ;# Must match value in generic/tclOO.h
 package require tcltest 2
 if {"::tcltest" in [namespace children]} {
     namespace import -force ::tcltest::*
diff --git a/tests/ooNext2.test b/tests/ooNext2.test
index eeade11..e78e0d0 100644
--- a/tests/ooNext2.test
+++ b/tests/ooNext2.test
@@ -2,16 +2,14 @@
 # Sourcing this file into Tcl runs the tests and generates output for errors.
 # No output means no errors were found.
 #
-# Copyright (c) 2006-2008 Donal K. Fellows
+# Copyright (c) 2006-2011 Donal K. Fellows
 #
 # See the file "license.terms" for information on usage and redistribution of
 # this file, and for a DISCLAIMER OF ALL WARRANTIES.
-#
-# RCS: @(#) $Id: oo.test,v 1.59 2011/01/18 16:10:48 dkf Exp $
 
-package require -exact TclOO 0.6.3 ;# Must match value in configure.in
-if {[lsearch [namespace children] ::tcltest] == -1} {
-    package require tcltest 2
+package require -exact TclOO 0.7 ;# Must match value in configure.in
+package require tcltest 2
+if {"::tcltest" in [namespace children]} {
     namespace import -force ::tcltest::*
 }
 
diff --git a/tests/thread.test b/tests/thread.test
index f2735da..43222ac 100644
--- a/tests/thread.test
+++ b/tests/thread.test
@@ -79,7 +79,7 @@ if {[testConstraint thread]} {
 if {[testConstraint testthread]} {
     proc drainEventQueue {} {
 	while {[set x [testthread event]]} {
-	    puts "WARNING: drained $x event(s) on main thread"
+	    #puts "WARNING: drained $x event(s) on main thread"
 	}
     }
 
diff --git a/tests/winDde.test b/tests/winDde.test
index 01fb54c..9411c92 100644
--- a/tests/winDde.test
+++ b/tests/winDde.test
@@ -15,11 +15,12 @@ if {"::tcltest" ni [namespace children]} {
     namespace import -force ::tcltest::*
 }
 
+testConstraint debug [::tcl::pkgconfig get debug]
 testConstraint dde 0
 if {[testConstraint win]} {
     if {![catch {
 	    ::tcltest::loadTestedCommands
-	    set ::ddever [package require dde 1.4.0b1]
+	    set ::ddever [package require dde 1.4.0b2]
 	    set ::ddelib [lindex [package ifneeded dde $::ddever] 1]}]} {
 	testConstraint dde 1
     }
@@ -103,7 +104,7 @@ proc createChildProcess {ddeServerName args} {
 # -------------------------------------------------------------------------
 test winDde-1.0 {check if we are testing the right dll} {win dde} {
     set ::ddever
-} {1.4.0b1}
+} {1.4.0b2}
 
 test winDde-1.1 {Settings the server's topic name} -constraints dde -body {
     list [dde servername foobar] [dde servername] [dde servername self]
@@ -162,10 +163,20 @@ test winDde-3.6 {DDE request utf8} -constraints dde -body {
 # Set variable a to A with diaeresis (unicode C4) using binary execute
 # and compose utf-8 (e.g. "c3 84" ) manualy
 test winDde-3.7 {DDE request binary} -constraints dde -body {
-    set a "not set"
-    dde execute -binary TclEval self [list set a \xc3\x84\x00]
-    scan $a %c
+    set \xe1 "not set"
+    dde execute -binary TclEval self [list set \xc3\xa1 \xc3\x84\x00]
+    scan [set \xe1] %c
 } -result 196
+test winDde-3.8 {DDE poke locally} -constraints {dde debug} -body {
+    set \xe1 ""
+    dde poke TclEval self \xe1 \xc4
+    dde request TclEval self \xe1
+} -result \xc4
+test winDde-3.9 {DDE poke -binary locally} -constraints {dde debug} -body {
+    set \xe1 ""
+    dde poke -binary TclEval self \xe1 \xc3\x84\x00
+    dde request TclEval self \xe1
+} -result \xc4
 
 # -------------------------------------------------------------------------
 
@@ -192,8 +203,8 @@ test winDde-4.3 {DDE request remotely} -constraints {dde stdio} -body {
     set \xe1 ""
     set name ch\xEDld-4.3
     set child [createChildProcess $name]
-    dde execute TclEval $name [list set a foo]
-    set \xe1 [dde request TclEval $name a]
+    dde execute TclEval $name [list set \xe1 foo]
+    set \xe1 [dde request TclEval $name \xe1]
     dde execute TclEval $name {set done 1}
     update
     set \xe1
@@ -202,11 +213,21 @@ test winDde-4.4 {DDE eval remotely} -constraints {dde stdio} -body {
     set \xe1 ""
     set name ch\xEDld-4.4
     set child [createChildProcess $name]
-    set \xe1 [dde eval $name set a foo]
+    set \xe1 [dde eval $name set \xe1 foo]
     dde execute TclEval $name {set done 1}
     update
     set \xe1
 }  -result foo
+test winDde-4.5 {DDE poke remotely} -constraints {dde debug stdio} -body {
+    set \xe1 ""
+    set name ch\xEDld-4.5
+    set child [createChildProcess $name]
+    dde poke TclEval $name \xe1 foo
+    set \xe1 [dde request TclEval $name \xe1]
+    dde execute TclEval $name {set done 1}
+    update
+    set \xe1
+} -result foo
 
 # -------------------------------------------------------------------------
 
diff --git a/tests/zlib.test b/tests/zlib.test
index 8212082..5f1e5fc 100644
--- a/tests/zlib.test
+++ b/tests/zlib.test
@@ -10,7 +10,7 @@
 # See the file "license.terms" for information on usage and redistribution of
 # this file, and for a DISCLAIMER OF ALL WARRANTIES.
 
-if {[lsearch [namespace children] ::tcltest] == -1} {
+if {"::tcltest" ni [namespace children]} {
     package require tcltest 2.1
     namespace import -force ::tcltest::*
 }
@@ -23,6 +23,12 @@ test zlib-1.1 {zlib basics} -constraints zlib -returnCodes error -body {
 test zlib-1.2 {zlib basics} -constraints zlib -returnCodes error -body {
     zlib ? {}
 } -result {bad command "?": must be adler32, compress, crc32, decompress, deflate, gunzip, gzip, inflate, push, or stream}
+test zlib-1.3 {zlib basics} -constraints zlib -body {
+    zlib::pkgconfig list
+} -result zlibVersion
+test zlib-1.4 {zlib basics} -constraints zlib -body {
+    package present zlib
+} -result 2.0
 
 test zlib-2.1 {zlib compress/decompress} zlib {
     zlib decompress [zlib compress abcdefghijklm]
@@ -70,7 +76,7 @@ test zlib-7.0 {zlib stream} -constraints zlib -returnCodes error -setup {
     $s ?
 } -cleanup {
     $s close
-} -result {bad option "?": must be add, checksum, close, eof, finalize, flush, fullflush, get, put, or reset}
+} -result {bad option "?": must be add, checksum, close, eof, finalize, flush, fullflush, get, header, put, or reset}
 test zlib-7.1 {zlib stream} zlib {
     set s [zlib stream compress]
     $s put -finalize abcdeEDCBA
@@ -203,6 +209,163 @@ test zlib-8.5 {transformation and flushing and fileevents: Bug 3525907} -setup {
 } -cleanup {
     catch {close $r}
 } -result {qwertyuiop MIDDLE asdfghjkl}
+test zlib-8.6 {transformation and fconfigure} -setup {
+    set file [makeFile {} test.z]
+    set fd [open $file wb]
+} -constraints zlib -body {
+    list [fconfigure $fd] [zlib push compress $fd; fconfigure $fd] \
+	[chan pop $fd; fconfigure $fd]
+} -cleanup {
+    catch {close $fd}
+    removeFile $file
+} -result {{-blocking 1 -buffering full -buffersize 4096 -encoding binary -eofchar {} -translation lf} {-blocking 1 -buffering full -buffersize 4096 -encoding binary -eofchar {} -translation lf -checksum 1 -dictionary {}} {-blocking 1 -buffering full -buffersize 4096 -encoding binary -eofchar {} -translation lf}}
+test zlib-8.7 {transformation and fconfigure} -setup {
+    set file [makeFile {} test.gz]
+    set fd [open $file wb]
+} -constraints zlib -body {
+    list [fconfigure $fd] [zlib push gzip $fd; fconfigure $fd] \
+	[chan pop $fd; fconfigure $fd]
+} -cleanup {
+    catch {close $fd}
+    removeFile $file
+} -result {{-blocking 1 -buffering full -buffersize 4096 -encoding binary -eofchar {} -translation lf} {-blocking 1 -buffering full -buffersize 4096 -encoding binary -eofchar {} -translation lf -checksum 0} {-blocking 1 -buffering full -buffersize 4096 -encoding binary -eofchar {} -translation lf}}
+# Input is headers from fetching SPDY draft
+# Dictionary is that which is proposed _in_ SPDY draft
+set spdyHeaders "HTTP/1.0 200 OK\r\nContent-Type: text/html; charset=utf-8\r\nX-Robots-Tag: noarchive\r\nLast-Modified: Tue, 05 Jun 2012 02:43:25 GMT\r\nETag: \"1338864205129|#public|0|en|||0\"\r\nExpires: Tue, 05 Jun 2012 16:17:11 GMT\r\nDate: Tue, 05 Jun 2012 16:17:06 GMT\r\nCache-Control: public, max-age=5\r\nX-Content-Type-Options: nosniff\r\nX-XSS-Protection: 1; mode=block\r\nServer: GSE\r\n"
+set spdyDict "optionsgetheadpostputdeletetraceacceptaccept-charsetaccept-encodingaccept-languageauthorizationexpectfromhostif-modified-sinceif-matchif-none-matchif-rangeif-unmodifiedsincemax-forwardsproxy-authorizationrangerefererteuser-agent100101200201202203204205206300301302303304305306307400401402403404405406407408409410411412413414415416417500501502503504505accept-rangesageetaglocationproxy-authenticatepublicretry-afterservervarywarningwww-authenticateallowcontent-basecontent-encodingcache-controlconnectiondatetrailertransfer-encodingupgradeviawarningcontent-languagecontent-lengthcontent-locationcontent-md5content-rangecontent-typeetagexpireslast-modifiedset-cookieMondayTuesdayWednesdayThursdayFridaySaturdaySundayJanFebMarAprMayJunJulAugSepOctNovDecchunkedtext/htmlimage/pngimage/jpgimage/gifapplication/xmlapplication/xhtmltext/plainpublicmax-agecharset=iso-8859-1utf-8gzipdeflateHTTP/1.1statusversionurl"
+test zlib-8.8 {transformtion and fconfigure} -setup {
+    lassign [chan pipe] inSide outSide
+} -constraints zlib -body {
+    zlib push compress $outSide -dictionary $spdyDict
+    fconfigure $outSide -blocking 0 -translation binary -buffering none
+    fconfigure $inSide -blocking 0 -translation binary
+    puts -nonewline $outSide $spdyHeaders
+    chan pop $outSide
+    set compressed [read $inSide]
+    catch {zlib decompress $compressed} err opt
+    list [string length [zlib compress $spdyHeaders]] \
+	[string length $compressed] \
+	$err [dict get $opt -errorcode] [zlib adler32 $spdyDict]
+} -cleanup {
+    catch {close $outSide}
+    catch {close $inSide}
+} -result {260 222 {need dictionary} {TCL ZLIB NEED_DICT 2381337010} 2381337010}
+test zlib-8.9 {transformtion and fconfigure} -setup {
+    lassign [chan pipe] inSide outSide
+    set strm [zlib stream decompress]
+} -constraints zlib -body {
+    zlib push compress $outSide -dictionary $spdyDict
+    fconfigure $outSide -blocking 0 -translation binary -buffering none
+    fconfigure $inSide -blocking 0 -translation binary
+    puts -nonewline $outSide $spdyHeaders
+    set result [fconfigure $outSide -checksum]
+    chan pop $outSide
+    $strm put -dictionary $spdyDict [read $inSide]
+    lappend result [string length $spdyHeaders] [string length [$strm get]]
+} -cleanup {
+    catch {close $outSide}
+    catch {close $inSide}
+    catch {$strm close}
+} -result {3064818174 358 358}
+test zlib-8.10 {transformtion and fconfigure} -setup {
+    lassign [chan pipe] inSide outSide
+} -constraints zlib -body {
+    zlib push deflate $outSide -dictionary $spdyDict
+    fconfigure $outSide -blocking 0 -translation binary -buffering none
+    fconfigure $inSide -blocking 0 -translation binary
+    puts -nonewline $outSide $spdyHeaders
+    chan pop $outSide
+    set compressed [read $inSide]
+    catch {zlib inflate $compressed} err opt
+    list [string length [zlib deflate $spdyHeaders]] \
+	[string length $compressed] \
+	$err [dict get $opt -errorcode]
+} -cleanup {
+    catch {close $outSide}
+    catch {close $inSide}
+} -result {254 212 {data error} {TCL ZLIB DATA}}
+test zlib-8.11 {transformtion and fconfigure} -setup {
+    lassign [chan pipe] inSide outSide
+    set strm [zlib stream inflate]
+} -constraints zlib -body {
+    zlib push deflate $outSide -dictionary $spdyDict
+    fconfigure $outSide -blocking 0 -translation binary -buffering none
+    fconfigure $inSide -blocking 0 -translation binary
+    puts -nonewline $outSide $spdyHeaders
+    chan pop $outSide
+    $strm put -dictionary $spdyDict [read $inSide]
+    list [string length $spdyHeaders] [string length [$strm get]]
+} -cleanup {
+    catch {close $outSide}
+    catch {close $inSide}
+    catch {$strm close}
+} -result {358 358}
+test zlib-8.12 {transformtion and fconfigure} -setup {
+    lassign [chan pipe] inSide outSide
+    set strm [zlib stream compress]
+} -constraints zlib -body {
+    $strm put -dictionary $spdyDict -finalize $spdyHeaders
+    zlib push decompress $inSide
+    fconfigure $outSide -blocking 0 -translation binary
+    fconfigure $inSide -translation binary -dictionary $spdyDict
+    puts -nonewline $outSide [$strm get]
+    close $outSide
+    list [string length $spdyHeaders] [string length [read $inSide]] \
+	[fconfigure $inSide -checksum]
+} -cleanup {
+    catch {close $outSide}
+    catch {close $inSide}
+    catch {$strm close}
+} -result {358 358 3064818174}
+test zlib-8.13 {transformtion and fconfigure} -setup {
+    lassign [chan pipe] inSide outSide
+    set strm [zlib stream compress]
+} -constraints zlib -body {
+    $strm put -dictionary $spdyDict -finalize $spdyHeaders
+    zlib push decompress $inSide -dictionary $spdyDict
+    fconfigure $outSide -blocking 0 -translation binary
+    fconfigure $inSide -translation binary
+    puts -nonewline $outSide [$strm get]
+    close $outSide
+    list [string length $spdyHeaders] [string length [read $inSide]] \
+	[fconfigure $inSide -checksum]
+} -cleanup {
+    catch {close $outSide}
+    catch {close $inSide}
+    catch {$strm close}
+} -result {358 358 3064818174}
+test zlib-8.14 {transformtion and fconfigure} -setup {
+    lassign [chan pipe] inSide outSide
+    set strm [zlib stream deflate]
+} -constraints zlib -body {
+    $strm put -finalize -dictionary $spdyDict $spdyHeaders
+    zlib push inflate $inSide
+    fconfigure $outSide -blocking 0 -buffering none -translation binary
+    fconfigure $inSide -translation binary -dictionary $spdyDict
+    puts -nonewline $outSide [$strm get]
+    close $outSide
+    list [string length $spdyHeaders] [string length [read $inSide]]
+} -cleanup {
+    catch {close $outSide}
+    catch {close $inSide}
+    catch {$strm close}
+} -result {358 358}
+test zlib-8.15 {transformtion and fconfigure} -setup {
+    lassign [chan pipe] inSide outSide
+    set strm [zlib stream deflate]
+} -constraints zlib -body {
+    $strm put -finalize -dictionary $spdyDict $spdyHeaders
+    zlib push inflate $inSide -dictionary $spdyDict
+    fconfigure $outSide -blocking 0 -buffering none -translation binary
+    fconfigure $inSide -translation binary
+    puts -nonewline $outSide [$strm get]
+    close $outSide
+    list [string length $spdyHeaders] [string length [read $inSide]]
+} -cleanup {
+    catch {close $outSide}
+    catch {close $inSide}
+    catch {$strm close}
+} -result {358 358}
 
 test zlib-9.1 "check fcopy with push" -constraints zlib -setup {
     set sfile [makeFile {} testsrc.gz]
diff --git a/tools/tcl.wse.in b/tools/tcl.wse.in
index 653b1e1..77beb41 100644
--- a/tools/tcl.wse.in
+++ b/tools/tcl.wse.in
@@ -12,7 +12,7 @@ item: Global
   Log Pathname=%MAINDIR%\INSTALL.LOG
   Message Font=MS Sans Serif
   Font Size=8
-  Disk Label=tcl8.6b2
+  Disk Label=tcl8.6b3
   Disk Filename=setup
   Patch Flags=0000000000000001
   Patch Threshold=85
diff --git a/unix/Makefile.in b/unix/Makefile.in
index 068cb12..9ac84f7 100644
--- a/unix/Makefile.in
+++ b/unix/Makefile.in
@@ -846,8 +846,8 @@ install-libraries: libraries
 	    do \
 	    $(INSTALL_DATA) $$i "$(SCRIPT_INSTALL_DIR)"/opt0.4; \
 	    done;
-	@echo "Installing package msgcat 1.4.5 as a Tcl Module";
-	@$(INSTALL_DATA) $(TOP_DIR)/library/msgcat/msgcat.tcl "$(SCRIPT_INSTALL_DIR)"/../tcl8/8.5/msgcat-1.4.5.tm;
+	@echo "Installing package msgcat 1.5.0 as a Tcl Module";
+	@$(INSTALL_DATA) $(TOP_DIR)/library/msgcat/msgcat.tcl "$(SCRIPT_INSTALL_DIR)"/../tcl8/8.5/msgcat-1.5.0.tm;
 	@echo "Installing package tcltest 2.3.4 as a Tcl Module";
 	@$(INSTALL_DATA) $(TOP_DIR)/library/tcltest/tcltest.tcl "$(SCRIPT_INSTALL_DIR)"/../tcl8/8.5/tcltest-2.3.4.tm;
 
@@ -856,7 +856,7 @@ install-libraries: libraries
 	@echo "Installing package platform::shell 1.1.4 as a Tcl Module";
 	@$(INSTALL_DATA) $(TOP_DIR)/library/platform/shell.tcl "$(SCRIPT_INSTALL_DIR)"/../tcl8/8.4/platform/shell-1.1.4.tm;
 
-	@echo "Installing library encoding files to $(SCRIPT_INSTALL_DIR)/encoding/";
+	@echo "Installing encoding files to $(SCRIPT_INSTALL_DIR)/encoding/";
 	@for i in $(TOP_DIR)/library/encoding/*.enc ; do \
 		$(INSTALL_DATA) $$i "$(SCRIPT_INSTALL_DIR)"/encoding; \
 	done;
@@ -867,7 +867,7 @@ install-libraries: libraries
 	fi
 
 install-tzdata: ${NATIVE_TCLSH}
-	@echo "Installing time zone data"
+	@echo "Installing time zone files to $(SCRIPT_INSTALL_DIR)/tzdata/"
 	@${NATIVE_TCLSH} $(TOOL_DIR)/installData.tcl \
 	    $(TOP_DIR)/library/tzdata "$(SCRIPT_INSTALL_DIR)"/tzdata
 
@@ -894,17 +894,17 @@ install-doc: doc
 		else true; \
 		fi; \
 	    done;
-	@echo "Installing and cross-linking top-level (.1) docs";
+	@echo "Installing and cross-linking top-level (.1) docs to $(MAN1_INSTALL_DIR)/";
 	@for i in $(TOP_DIR)/doc/*.1; do \
 	    $(SHELL) $(UNIX_DIR)/installManPage $(MAN_FLAGS) $$i "$(MAN1_INSTALL_DIR)"; \
 	done
 
-	@echo "Installing and cross-linking C API (.3) docs";
+	@echo "Installing and cross-linking C API (.3) docs to $(MAN3_INSTALL_DIR)/";
 	@for i in $(TOP_DIR)/doc/*.3; do \
 	    $(SHELL) $(UNIX_DIR)/installManPage $(MAN_FLAGS) $$i "$(MAN3_INSTALL_DIR)"; \
 	done
 
-	@echo "Installing and cross-linking command (.n) docs";
+	@echo "Installing and cross-linking command (.n) docs to $(MANN_INSTALL_DIR)/";
 	@for i in $(TOP_DIR)/doc/*.n; do \
 	    $(SHELL) $(UNIX_DIR)/installManPage $(MAN_FLAGS) $$i "$(MANN_INSTALL_DIR)"; \
 	done
@@ -1928,7 +1928,6 @@ dist: $(UNIX_DIR)/configure $(UNIX_DIR)/tclConfig.h.in $(UNIX_DIR)/tcl.pc.in $(M
 		$(UNIX_DIR)/tcl.pc.in $(DISTDIR)/unix
 	chmod 775 $(DISTDIR)/unix/configure $(DISTDIR)/unix/configure.in
 	chmod 775 $(DISTDIR)/unix/ldAix
-	chmod +x $(DISTDIR)/unix/install-sh
 	mkdir $(DISTDIR)/generic
 	cp -p $(GENERIC_DIR)/*.[cdh] $(DISTDIR)/generic
 	cp -p $(GENERIC_DIR)/*.decls $(DISTDIR)/generic
diff --git a/unix/configure b/unix/configure
index 2e36ad2..cbb10b4 100755
--- a/unix/configure
+++ b/unix/configure
@@ -1335,7 +1335,7 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 TCL_VERSION=8.6
 TCL_MAJOR_VERSION=8
 TCL_MINOR_VERSION=6
-TCL_PATCH_LEVEL="b2"
+TCL_PATCH_LEVEL="b3"
 VERSION=${TCL_VERSION}
 
 #------------------------------------------------------------------------
@@ -1355,7 +1355,10 @@ fi
 #------------------------------------------------------------------------
 # Empty slate for bundled packages, to avoid stale configuration
 #------------------------------------------------------------------------
-rm -Rf pkgs
+#rm -Rf pkgs
+if test -f Makefile; then
+    make distclean-packages
+fi
 
 #------------------------------------------------------------------------
 # Handle the --prefix=... option
@@ -8757,7 +8760,7 @@ else
 		arch=`isainfo`
 		echo "$as_me:$LINENO: checking whether to use -lsunmath for fp rounding control" >&5
 echo $ECHO_N "checking whether to use -lsunmath for fp rounding control... $ECHO_C" >&6
-		if test "$arch" = "amd64 i386"; then
+		if test "$arch" = "amd64 i386" -o "$arch" = "i386"; then
 
 			echo "$as_me:$LINENO: result: yes" >&5
 echo "${ECHO_T}yes" >&6
@@ -8956,7 +8959,7 @@ else
 fi
 
 		case $system in
-		    SunOS-5.[1-9][0-9]*)
+		    SunOS-5.[1-9][0-9]*|SunOS-5.[7-9])
 			SHLIB_LD="\${CC} -G -z $textmode \${LDFLAGS}";;
 		    *)
 			SHLIB_LD="/usr/ccs/bin/ld -G -z $textmode";;
@@ -19437,8 +19440,8 @@ _ACEOF
     HTML_DIR="${libdir}/Resources/Documentation/Reference/Tcl"
     EXTRA_INSTALL="install-private-headers html-tcl"
     EXTRA_BUILD_HTML='@ln -fs contents.htm "$(HTML_INSTALL_DIR)"/TclTOC.html'
-    EXTRA_INSTALL_BINARIES='@echo "Installing Info.plist to $(LIB_INSTALL_DIR)/Resources" && mkdir -p "$(LIB_INSTALL_DIR)/Resources" && $(INSTALL_DATA) Tcl-Info.plist "$(LIB_INSTALL_DIR)/Resources/Info.plist"'
-    EXTRA_INSTALL_BINARIES="$EXTRA_INSTALL_BINARIES"' && echo "Installing license.terms to $(LIB_INSTALL_DIR)/Resources" && $(INSTALL_DATA) "$(TOP_DIR)/license.terms" "$(LIB_INSTALL_DIR)/Resources"'
+    EXTRA_INSTALL_BINARIES='@echo "Installing Info.plist to $(LIB_INSTALL_DIR)/Resources/" && $(INSTALL_DATA_DIR) "$(LIB_INSTALL_DIR)/Resources" && $(INSTALL_DATA) Tcl-Info.plist "$(LIB_INSTALL_DIR)/Resources/Info.plist"'
+    EXTRA_INSTALL_BINARIES="$EXTRA_INSTALL_BINARIES"' && echo "Installing license.terms to $(LIB_INSTALL_DIR)/Resources/" && $(INSTALL_DATA) "$(TOP_DIR)/license.terms" "$(LIB_INSTALL_DIR)/Resources"'
     EXTRA_INSTALL_BINARIES="$EXTRA_INSTALL_BINARIES"' && echo "Finalizing Tcl.framework" && rm -f "$(LIB_INSTALL_DIR)/../Current" && ln -s "$(VERSION)" "$(LIB_INSTALL_DIR)/../Current" && for f in "$(LIB_FILE)" tclConfig.sh Resources Headers PrivateHeaders; do rm -f "$(LIB_INSTALL_DIR)/../../$$f" && ln -s "Versions/Current/$$f" "$(LIB_INSTALL_DIR)/../.."; done && f="$(STUB_LIB_FILE)" && rm -f "$(LIB_INSTALL_DIR)/../../$$f" && ln -s "Versions/$(VERSION)/$$f" "$(LIB_INSTALL_DIR)/../.."'
     # Don't use AC_DEFINE for the following as the framework version define
     # needs to go into the Makefile even when using autoheader, so that we
diff --git a/unix/configure.in b/unix/configure.in
index c8f0bc6..f4b695d 100644
--- a/unix/configure.in
+++ b/unix/configure.in
@@ -25,7 +25,7 @@ m4_ifdef([SC_USE_CONFIG_HEADERS], [
 TCL_VERSION=8.6
 TCL_MAJOR_VERSION=8
 TCL_MINOR_VERSION=6
-TCL_PATCH_LEVEL="b2"
+TCL_PATCH_LEVEL="b3"
 VERSION=${TCL_VERSION}
 
 #------------------------------------------------------------------------
@@ -45,7 +45,10 @@ fi
 #------------------------------------------------------------------------
 # Empty slate for bundled packages, to avoid stale configuration
 #------------------------------------------------------------------------
-rm -Rf pkgs
+#rm -Rf pkgs
+if test -f Makefile; then
+    make distclean-packages
+fi
 
 #------------------------------------------------------------------------
 # Handle the --prefix=... option
@@ -841,8 +844,8 @@ if test "$FRAMEWORK_BUILD" = "1" ; then
     HTML_DIR="${libdir}/Resources/Documentation/Reference/Tcl"
     EXTRA_INSTALL="install-private-headers html-tcl"
     EXTRA_BUILD_HTML='@ln -fs contents.htm "$(HTML_INSTALL_DIR)"/TclTOC.html'
-    EXTRA_INSTALL_BINARIES='@echo "Installing Info.plist to $(LIB_INSTALL_DIR)/Resources" && mkdir -p "$(LIB_INSTALL_DIR)/Resources" && $(INSTALL_DATA) Tcl-Info.plist "$(LIB_INSTALL_DIR)/Resources/Info.plist"'
-    EXTRA_INSTALL_BINARIES="$EXTRA_INSTALL_BINARIES"' && echo "Installing license.terms to $(LIB_INSTALL_DIR)/Resources" && $(INSTALL_DATA) "$(TOP_DIR)/license.terms" "$(LIB_INSTALL_DIR)/Resources"'
+    EXTRA_INSTALL_BINARIES='@echo "Installing Info.plist to $(LIB_INSTALL_DIR)/Resources/" && $(INSTALL_DATA_DIR) "$(LIB_INSTALL_DIR)/Resources" && $(INSTALL_DATA) Tcl-Info.plist "$(LIB_INSTALL_DIR)/Resources/Info.plist"'
+    EXTRA_INSTALL_BINARIES="$EXTRA_INSTALL_BINARIES"' && echo "Installing license.terms to $(LIB_INSTALL_DIR)/Resources/" && $(INSTALL_DATA) "$(TOP_DIR)/license.terms" "$(LIB_INSTALL_DIR)/Resources"'
     EXTRA_INSTALL_BINARIES="$EXTRA_INSTALL_BINARIES"' && echo "Finalizing Tcl.framework" && rm -f "$(LIB_INSTALL_DIR)/../Current" && ln -s "$(VERSION)" "$(LIB_INSTALL_DIR)/../Current" && for f in "$(LIB_FILE)" tclConfig.sh Resources Headers PrivateHeaders; do rm -f "$(LIB_INSTALL_DIR)/../../$$f" && ln -s "Versions/Current/$$f" "$(LIB_INSTALL_DIR)/../.."; done && f="$(STUB_LIB_FILE)" && rm -f "$(LIB_INSTALL_DIR)/../../$$f" && ln -s "Versions/$(VERSION)/$$f" "$(LIB_INSTALL_DIR)/../.."'
     # Don't use AC_DEFINE for the following as the framework version define
     # needs to go into the Makefile even when using autoheader, so that we
diff --git a/unix/tcl.m4 b/unix/tcl.m4
index a142baf..b13fddd 100644
--- a/unix/tcl.m4
+++ b/unix/tcl.m4
@@ -1968,7 +1968,7 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
 	    AS_IF([test "$GCC" = yes],[use_sunmath=no],[
 		arch=`isainfo`
 		AC_MSG_CHECKING([whether to use -lsunmath for fp rounding control])
-		AS_IF([test "$arch" = "amd64 i386"], [
+		AS_IF([test "$arch" = "amd64 i386" -o "$arch" = "i386"], [
 			AC_MSG_RESULT([yes])
 			MATH_LIBS="-lsunmath $MATH_LIBS"
 			AC_CHECK_HEADER(sunmath.h)
@@ -2001,7 +2001,7 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
 	    ], [
 		AS_IF([test "$use_sunmath" = yes], [textmode=textoff],[textmode=text])
 		case $system in
-		    SunOS-5.[[1-9]][[0-9]]*)
+		    SunOS-5.[[1-9]][[0-9]]*|SunOS-5.[[7-9]])
 			SHLIB_LD="\${CC} -G -z $textmode \${LDFLAGS}";;
 		    *)
 			SHLIB_LD="/usr/ccs/bin/ld -G -z $textmode";;
diff --git a/unix/tcl.spec b/unix/tcl.spec
index b35e220..0c42aa4 100644
--- a/unix/tcl.spec
+++ b/unix/tcl.spec
@@ -4,7 +4,7 @@
 
 Name:          tcl
 Summary:       Tcl scripting language development environment
-Version:       8.6b2
+Version:       8.6b3
 Release:       2
 License:       BSD
 Group:         Development/Languages
diff --git a/unix/tclConfig.h.in b/unix/tclConfig.h.in
index 31466bc..f171cce 100644
--- a/unix/tclConfig.h.in
+++ b/unix/tclConfig.h.in
@@ -4,6 +4,9 @@
     #ifndef _TCLCONFIG
     #define _TCLCONFIG
 
+/* Define if building universal (internal helper macro) */
+#undef AC_APPLE_UNIVERSAL_BUILD
+
 /* Is gettimeofday() actually declared in <sys/time.h>? */
 #undef GETTOD_NOT_DECLARED
 
@@ -13,8 +16,8 @@
 /* Define to 1 if the system has the type `blkcnt_t'. */
 #undef HAVE_BLKCNT_T
 
-/* Do we have BSDgettimeofday()? */
-#undef HAVE_BSDGETTIMEOFDAY
+/* Defined when compiler supports casting to union type. */
+#undef HAVE_CAST_TO_UNION
 
 /* Define to 1 if you have the `chflags' function. */
 #undef HAVE_CHFLAGS
@@ -28,6 +31,9 @@
 /* Do we have access to Darwin CoreFoundation.framework? */
 #undef HAVE_COREFOUNDATION
 
+/* Is the cpuid instruction usable? */
+#undef HAVE_CPUID
+
 /* Define to 1 if you have the `freeaddrinfo' function. */
 #undef HAVE_FREEADDRINFO
 
@@ -205,10 +211,10 @@
 /* Is 'struct stat64' in <sys/stat.h>? */
 #undef HAVE_STRUCT_STAT64
 
-/* Define to 1 if `st_blksize' is member of `struct stat'. */
+/* Define to 1 if `st_blksize' is a member of `struct stat'. */
 #undef HAVE_STRUCT_STAT_ST_BLKSIZE
 
-/* Define to 1 if `st_blocks' is member of `struct stat'. */
+/* Define to 1 if `st_blocks' is a member of `struct stat'. */
 #undef HAVE_STRUCT_STAT_ST_BLOCKS
 
 /* Define to 1 if you have the <sys/filio.h> header file. */
@@ -271,6 +277,9 @@
 /* Default libtommath precision. */
 #undef MP_PREC
 
+/* Is no debugging enabled? */
+#undef NDEBUG
+
 /* Use compat implementation of getaddrinfo() and friends */
 #undef NEED_FAKE_RFC2553
 
@@ -349,6 +358,9 @@
 /* Define to the one symbol short name of this package. */
 #undef PACKAGE_TARNAME
 
+/* Define to the home page for this package. */
+#undef PACKAGE_URL
+
 /* Define to the version of this package. */
 #undef PACKAGE_VERSION
 
@@ -361,9 +373,6 @@
 /* What encoding should be used for embedded configuration info? */
 #undef TCL_CFGVAL_ENCODING
 
-/* Is debugging enabled? */
-#undef NDEBUG
-
 /* Is this a 64-bit build? */
 #undef TCL_CFG_DO64BIT
 
@@ -439,9 +448,17 @@
 /* Should we use vfork() instead of fork()? */
 #undef USE_VFORK
 
-/* Define to 1 if your processor stores words with the most significant byte
-   first (like Motorola and SPARC, unlike Intel and VAX). */
-#undef WORDS_BIGENDIAN
+/* Define WORDS_BIGENDIAN to 1 if your processor stores words with the most
+   significant byte first (like Motorola and SPARC, unlike Intel). */
+#if defined AC_APPLE_UNIVERSAL_BUILD
+# if defined __BIG_ENDIAN__
+#  define WORDS_BIGENDIAN 1
+# endif
+#else
+# ifndef WORDS_BIGENDIAN
+#  undef WORDS_BIGENDIAN
+# endif
+#endif
 
 /* Are Darwin SUSv3 extensions available? */
 #undef _DARWIN_C_SOURCE
@@ -496,7 +513,7 @@
 /* Define to `int' if <sys/types.h> does not define. */
 #undef pid_t
 
-/* Define to `unsigned' if <sys/types.h> does not define. */
+/* Define to `unsigned int' if <sys/types.h> does not define. */
 #undef size_t
 
 /* Define as int if socklen_t is not available */
diff --git a/unix/tclLoadDl.c b/unix/tclLoadDl.c
index d86e7fd..a48aa23 100644
--- a/unix/tclLoadDl.c
+++ b/unix/tclLoadDl.c
@@ -112,8 +112,9 @@ TclpDlopen(
 
 	const char *errorStr = dlerror();
 
-	Tcl_AppendResult(interp, "couldn't load file \"",
-		Tcl_GetString(pathPtr), "\": ", errorStr, NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't load file \"%s\": %s",
+		Tcl_GetString(pathPtr), errorStr));
 	return TCL_ERROR;
     }
     newHandle = ckalloc(sizeof(*newHandle));
@@ -175,9 +176,14 @@ FindSymbol(
     }
     Tcl_DStringFree(&ds);
     if (proc == NULL && interp != NULL) {
-	Tcl_ResetResult(interp);
-	Tcl_AppendResult(interp, "cannot find symbol \"", symbol, "\": ",
-		dlerror(), NULL);
+	const char *errorStr = dlerror();
+
+	if (!errorStr) {
+	    errorStr = "unknown";
+	}
+
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"cannot find symbol \"%s\": %s", symbol, errorStr));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "LOAD_SYMBOL", symbol,
 		NULL);
     }
diff --git a/unix/tclLoadDyld.c b/unix/tclLoadDyld.c
index 31d15b2..95735a4 100644
--- a/unix/tclLoadDyld.c
+++ b/unix/tclLoadDyld.c
@@ -16,42 +16,36 @@
 #include "tclInt.h"
 
 #ifndef MODULE_SCOPE
-#define MODULE_SCOPE extern
+#   define MODULE_SCOPE		extern
 #endif
 
-#ifndef TCL_DYLD_USE_DLFCN
 /*
  * Use preferred dlfcn API on 10.4 and later
  */
-#   if !defined(NO_DLFCN_H) && MAC_OS_X_VERSION_MAX_ALLOWED >= 1040
-#	define TCL_DYLD_USE_DLFCN 1
-#   else
+
+#ifndef TCL_DYLD_USE_DLFCN
+#   ifdef NO_DLFCN_H
 #	define TCL_DYLD_USE_DLFCN 0
+#   else
+#	define TCL_DYLD_USE_DLFCN 1
 #   endif
 #endif
-#ifndef TCL_DYLD_USE_NSMODULE
+
 /*
  * Use deprecated NSModule API only to support 10.3 and earlier:
  */
-#   if MAC_OS_X_VERSION_MIN_REQUIRED < 1040
-#	define TCL_DYLD_USE_NSMODULE 1
-#   else
-#	define TCL_DYLD_USE_NSMODULE 0
-#   endif
+
+#ifndef TCL_DYLD_USE_NSMODULE
+#   define TCL_DYLD_USE_NSMODULE 0
 #endif
 
-#if TCL_DYLD_USE_DLFCN
-#include <dlfcn.h>
-#if defined(HAVE_WEAK_IMPORT) && MAC_OS_X_VERSION_MIN_REQUIRED < 1040
 /*
- * Support for weakly importing dlfcn API.
+ * Use includes for the API we're using.
  */
-extern void *dlopen(const char *path, int mode) WEAK_IMPORT_ATTRIBUTE;
-extern void *dlsym(void *handle, const char *symbol) WEAK_IMPORT_ATTRIBUTE;
-extern int dlclose(void *handle) WEAK_IMPORT_ATTRIBUTE;
-extern char *dlerror(void) WEAK_IMPORT_ATTRIBUTE;
-#endif
-#endif
+
+#if TCL_DYLD_USE_DLFCN
+#   include <dlfcn.h>
+#endif /* TCL_DYLD_USE_DLFCN */
 
 #if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY)
 #include <mach-o/dyld.h>
@@ -60,38 +54,23 @@ extern char *dlerror(void) WEAK_IMPORT_ATTRIBUTE;
 #include <mach-o/arch.h>
 #include <libkern/OSByteOrder.h>
 #include <mach/mach.h>
-#include <stdbool.h>
 
 typedef struct Tcl_DyldModuleHandle {
     struct Tcl_DyldModuleHandle *nextPtr;
     NSModule module;
 } Tcl_DyldModuleHandle;
-#endif /* TCL_DYLD_USE_NSMODULE */
+#endif /* TCL_DYLD_USE_NSMODULE || TCL_LOAD_FROM_MEMORY */
 
-typedef struct Tcl_DyldLoadHandle {
-#if TCL_DYLD_USE_DLFCN
+typedef struct {
     void *dlHandle;
-#endif
 #if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY)
     const struct mach_header *dyldLibHeader;
     Tcl_DyldModuleHandle *modulePtr;
 #endif
 } Tcl_DyldLoadHandle;
 
-#if (TCL_DYLD_USE_DLFCN && MAC_OS_X_VERSION_MIN_REQUIRED < 1040) || \
-	defined(TCL_LOAD_FROM_MEMORY)
-MODULE_SCOPE long tclMacOSXDarwinRelease;
-#endif
-
-#ifdef TCL_DEBUG_LOAD
-#define TclLoadDbgMsg(m, ...) \
-    do {								\
-	fprintf(stderr, "%s:%d: %s(): " m ".\n",			\
-		strrchr(__FILE__, '/')+1, __LINE__, __func__,		\
-		##__VA_ARGS__);						\
-    } while (0)
-#else
-#define TclLoadDbgMsg(m, ...)
+#if TCL_DYLD_USE_DLFCN || defined(TCL_LOAD_FROM_MEMORY)
+MODULE_SCOPE long	tclMacOSXDarwinRelease;
 #endif
 
 /*
@@ -102,7 +81,6 @@ static void *		FindSymbol(Tcl_Interp *interp,
 			    Tcl_LoadHandle loadHandle, const char *symbol);
 static void		UnloadFile(Tcl_LoadHandle handle);
 
-#if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY)
 /*
  *----------------------------------------------------------------------
  *
@@ -120,6 +98,7 @@ static void		UnloadFile(Tcl_LoadHandle handle);
  *----------------------------------------------------------------------
  */
 
+#if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY)
 static const char *
 DyldOFIErrorMsg(
     int err)
@@ -141,7 +120,7 @@ DyldOFIErrorMsg(
 	return "unknown error";
     }
 }
-#endif /* TCL_DYLD_USE_NSMODULE */
+#endif /* TCL_DYLD_USE_NSMODULE || TCL_LOAD_FROM_MEMORY */
 
 /*
  *----------------------------------------------------------------------
@@ -176,9 +155,7 @@ TclpDlopen(
 {
     Tcl_DyldLoadHandle *dyldLoadHandle;
     Tcl_LoadHandle newHandle;
-#if TCL_DYLD_USE_DLFCN
     void *dlHandle = NULL;
-#endif
 #if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY)
     const struct mach_header *dyldLibHeader = NULL;
     Tcl_DyldModuleHandle *modulePtr = NULL;
@@ -187,11 +164,10 @@ TclpDlopen(
     NSLinkEditErrors editError;
     int errorNumber;
     const char *errorName, *objFileImageErrMsg = NULL;
-#endif
+#endif /* TCL_DYLD_USE_NSMODULE */
     const char *errMsg = NULL;
     int result;
     Tcl_DString ds;
-    char *fileName = NULL;
     const char *nativePath, *nativeFileName = NULL;
 
     /*
@@ -201,46 +177,36 @@ TclpDlopen(
      */
 
     nativePath = Tcl_FSGetNativePath(pathPtr);
+    nativeFileName = Tcl_UtfToExternalDString(NULL, Tcl_GetString(pathPtr),
+	    -1, &ds);
 
 #if TCL_DYLD_USE_DLFCN
-#if MAC_OS_X_VERSION_MIN_REQUIRED < 1040
-    if (tclMacOSXDarwinRelease >= 8)
-#endif
-    {
     /*
      * Use (RTLD_NOW|RTLD_LOCAL) always, see [Bug #3216070]
      */
-	dlHandle = dlopen(nativePath, RTLD_NOW | RTLD_LOCAL);
-	if (!dlHandle) {
-	    /*
-	     * Let the OS loader examine the binary search path for whatever
-	     * string the user gave us which hopefully refers to a file on the
-	     * binary path.
-	     */
 
-	    fileName = Tcl_GetString(pathPtr);
-	    nativeFileName = Tcl_UtfToExternalDString(NULL, fileName, -1, &ds);
-	    /*
-	     * Use (RTLD_NOW|RTLD_LOCAL) always, see [Bug #3216070]
-	     */
-	    dlHandle = dlopen(nativeFileName, RTLD_NOW | RTLD_LOCAL);
-	}
-	if (dlHandle) {
-	    TclLoadDbgMsg("dlopen() successful");
-	} else {
+    dlHandle = dlopen(nativePath, RTLD_NOW | RTLD_LOCAL);
+    if (!dlHandle) {
+	/*
+	 * Let the OS loader examine the binary search path for whatever string
+	 * the user gave us which hopefully refers to a file on the binary
+	 * path.
+	 *
+	 * Use (RTLD_NOW|RTLD_LOCAL) always, see [Bug #3216070]
+	 */
+
+	dlHandle = dlopen(nativeFileName, RTLD_NOW | RTLD_LOCAL);
+	if (!dlHandle) {
 	    errMsg = dlerror();
-	    TclLoadDbgMsg("dlopen() failed: %s", errMsg);
 	}
     }
-    if (!dlHandle)
 #endif /* TCL_DYLD_USE_DLFCN */
-    {
+
+    if (!dlHandle) {
 #if TCL_DYLD_USE_NSMODULE
 	dyldLibHeader = NSAddImage(nativePath,
 		NSADDIMAGE_OPTION_RETURN_ON_ERROR);
-	if (dyldLibHeader) {
-	    TclLoadDbgMsg("NSAddImage() successful");
-	} else {
+	if (!dyldLibHeader) {
 	    NSLinkEditError(&editError, &errorNumber, &errorName, &errMsg);
 	    if (editError == NSLinkEditFileAccessError) {
 		/*
@@ -249,20 +215,12 @@ TclpDlopen(
 		 * which hopefully refers to a file on the binary path.
 		 */
 
-		if (!fileName) {
-		    fileName = Tcl_GetString(pathPtr);
-		    nativeFileName = Tcl_UtfToExternalDString(NULL, fileName,
-			    -1, &ds);
-		}
 		dyldLibHeader = NSAddImage(nativeFileName,
 			NSADDIMAGE_OPTION_WITH_SEARCHING |
 			NSADDIMAGE_OPTION_RETURN_ON_ERROR);
-		if (dyldLibHeader) {
-		    TclLoadDbgMsg("NSAddImage() successful");
-		} else {
+		if (!dyldLibHeader) {
 		    NSLinkEditError(&editError, &errorNumber, &errorName,
 			    &errMsg);
-		    TclLoadDbgMsg("NSAddImage() failed: %s", errMsg);
 		}
 	    } else if ((editError == NSLinkEditFileFormatError
 		    && errorNumber == EBADMACHO)
@@ -279,8 +237,6 @@ TclpDlopen(
 		err = NSCreateObjectFileImageFromFile(nativePath,
 			&dyldObjFileImage);
 		if (err == NSObjectFileImageSuccess && dyldObjFileImage) {
-		    TclLoadDbgMsg("NSCreateObjectFileImageFromFile() "
-			    "successful");
 		    module = NSLinkModule(dyldObjFileImage, nativePath,
 			    NSLINKMODULE_OPTION_BINDNOW
 			    | NSLINKMODULE_OPTION_RETURN_ON_ERROR);
@@ -289,37 +245,29 @@ TclpDlopen(
 			modulePtr = ckalloc(sizeof(Tcl_DyldModuleHandle));
 			modulePtr->module = module;
 			modulePtr->nextPtr = NULL;
-			TclLoadDbgMsg("NSLinkModule() successful");
 		    } else {
 			NSLinkEditError(&editError, &errorNumber, &errorName,
 				&errMsg);
-			TclLoadDbgMsg("NSLinkModule() failed: %s", errMsg);
 		    }
 		} else {
 		    objFileImageErrMsg = DyldOFIErrorMsg(err);
-		    TclLoadDbgMsg("NSCreateObjectFileImageFromFile() failed: "
-			    "%s", objFileImageErrMsg);
 		}
 	    }
 	}
 #endif /* TCL_DYLD_USE_NSMODULE */
     }
-    if (0
-#if TCL_DYLD_USE_DLFCN
-	    || dlHandle
-#endif
+
+    if (dlHandle
 #if TCL_DYLD_USE_NSMODULE
 	    || dyldLibHeader || modulePtr
-#endif
+#endif /* TCL_DYLD_USE_NSMODULE */
     ) {
 	dyldLoadHandle = ckalloc(sizeof(Tcl_DyldLoadHandle));
-#if TCL_DYLD_USE_DLFCN
 	dyldLoadHandle->dlHandle = dlHandle;
-#endif
 #if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY)
 	dyldLoadHandle->dyldLibHeader = dyldLibHeader;
 	dyldLoadHandle->modulePtr = modulePtr;
-#endif
+#endif /* TCL_DYLD_USE_NSMODULE || TCL_LOAD_FROM_MEMORY */
 	newHandle = ckalloc(sizeof(*newHandle));
 	newHandle->clientData = dyldLoadHandle;
 	newHandle->findSymbolProcPtr = &FindSymbol;
@@ -328,18 +276,23 @@ TclpDlopen(
 	*loadHandle = newHandle;
 	result = TCL_OK;
     } else {
-	Tcl_AppendResult(interp, errMsg, NULL);
+	Tcl_Obj *errObj = Tcl_NewObj();
+
+	if (errMsg != NULL) {
+	    Tcl_AppendToObj(errObj, errMsg, -1);
+	}
 #if TCL_DYLD_USE_NSMODULE
 	if (objFileImageErrMsg) {
-	    Tcl_AppendResult(interp, "\nNSCreateObjectFileImageFromFile() "
-		    "error: ", objFileImageErrMsg, NULL);
+	    Tcl_AppendPrintfToObj(errObj,
+		    "\nNSCreateObjectFileImageFromFile() error: %s",
+		    objFileImageErrMsg);
 	}
-#endif
+#endif /* TCL_DYLD_USE_NSMODULE */
+	Tcl_SetObjResult(interp, errObj);
 	result = TCL_ERROR;
     }
-    if(fileName) {
-	Tcl_DStringFree(&ds);
-    }
+
+    Tcl_DStringFree(&ds);
     return result;
 }
 
@@ -372,18 +325,14 @@ FindSymbol(
     const char *native;
 
     native = Tcl_UtfToExternalDString(NULL, symbol, -1, &ds);
-#if TCL_DYLD_USE_DLFCN
     if (dyldLoadHandle->dlHandle) {
+#if TCL_DYLD_USE_DLFCN
 	proc = dlsym(dyldLoadHandle->dlHandle, native);
-	if (proc) {
-	    TclLoadDbgMsg("dlsym() successful");
-	} else {
+	if (!proc) {
 	    errMsg = dlerror();
-	    TclLoadDbgMsg("dlsym() failed: %s", errMsg);
 	}
-    } else
 #endif /* TCL_DYLD_USE_DLFCN */
-    {
+    } else {
 #if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY)
 	NSSymbol nsSymbol = NULL;
 	Tcl_DString newName;
@@ -400,13 +349,12 @@ FindSymbol(
 		    native, NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_NOW |
 		    NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR);
 	    if (nsSymbol) {
-		TclLoadDbgMsg("NSLookupSymbolInImage() successful");
-#ifdef DYLD_SUPPORTS_DYLIB_UNLOADING
 		/*
 		 * Until dyld supports unloading of MY_DYLIB binaries, the
 		 * following is not needed.
 		 */
 
+#ifdef DYLD_SUPPORTS_DYLIB_UNLOADING
 		NSModule module = NSModuleForSymbol(nsSymbol);
 		Tcl_DyldModuleHandle *modulePtr = dyldLoadHandle->modulePtr;
 
@@ -429,32 +377,21 @@ FindSymbol(
 		const char *errorName;
 
 		NSLinkEditError(&editError, &errorNumber, &errorName, &errMsg);
-		TclLoadDbgMsg("NSLookupSymbolInImage() failed: %s", errMsg);
 	    }
 	} else if (dyldLoadHandle->modulePtr) {
 	    nsSymbol = NSLookupSymbolInModule(
 		    dyldLoadHandle->modulePtr->module, native);
-	    if (nsSymbol) {
-		TclLoadDbgMsg("NSLookupSymbolInModule() successful");
-	    } else {
-		TclLoadDbgMsg("NSLookupSymbolInModule() failed");
-	    }
 	}
 	if (nsSymbol) {
 	    proc = NSAddressOfSymbol(nsSymbol);
-	    if (proc) {
-		TclLoadDbgMsg("NSAddressOfSymbol() successful");
-	    } else {
-		TclLoadDbgMsg("NSAddressOfSymbol() failed");
-	    }
 	}
 	Tcl_DStringFree(&newName);
 #endif /* TCL_DYLD_USE_NSMODULE */
     }
     Tcl_DStringFree(&ds);
     if (errMsg && (interp != NULL)) {
-	Tcl_AppendResult(interp, "cannot find symbol \"", symbol, "\": ",
-		errMsg, NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"cannot find symbol \"%s\": %s", symbol, errMsg));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "LOAD_SYMBOL", symbol,
 		NULL);
     }
@@ -489,34 +426,19 @@ UnloadFile(
 {
     Tcl_DyldLoadHandle *dyldLoadHandle = loadHandle->clientData;
 
-#if TCL_DYLD_USE_DLFCN
     if (dyldLoadHandle->dlHandle) {
-	int result;
-
-	result = dlclose(dyldLoadHandle->dlHandle);
-	if (!result) {
-	    TclLoadDbgMsg("dlclose() successful");
-	} else {
-	    TclLoadDbgMsg("dlclose() failed: %s", dlerror());
-	}
-    } else
+#if TCL_DYLD_USE_DLFCN
+	(void) dlclose(dyldLoadHandle->dlHandle);
 #endif /* TCL_DYLD_USE_DLFCN */
-    {
+    } else {
 #if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY)
 	Tcl_DyldModuleHandle *modulePtr = dyldLoadHandle->modulePtr;
 
 	while (modulePtr != NULL) {
-	    void *ptr;
-	    bool result;
+	    void *ptr = modulePtr;
 
-	    result = NSUnLinkModule(modulePtr->module,
+	    (void) NSUnLinkModule(modulePtr->module,
 		    NSUNLINKMODULE_OPTION_RESET_LAZY_REFERENCES);
-	    if (result) {
-		TclLoadDbgMsg("NSUnLinkModule() successful");
-	    } else {
-		TclLoadDbgMsg("NSUnLinkModule() failed");
-	    }
-	    ptr = modulePtr;
 	    modulePtr = modulePtr->nextPtr;
 	    ckfree(ptr);
 	}
@@ -556,7 +478,6 @@ TclGuessPackageName(
     return 0;
 }
 
-#ifdef TCL_LOAD_FROM_MEMORY
 /*
  *----------------------------------------------------------------------
  *
@@ -573,6 +494,7 @@ TclGuessPackageName(
  *----------------------------------------------------------------------
  */
 
+#ifdef TCL_LOAD_FROM_MEMORY
 MODULE_SCOPE void *
 TclpLoadMemoryGetBuffer(
     Tcl_Interp *interp,		/* Used for error reporting. */
@@ -597,6 +519,7 @@ TclpLoadMemoryGetBuffer(
     }
     return buffer;
 }
+#endif /* TCL_LOAD_FROM_MEMORY */
 
 /*
  *----------------------------------------------------------------------
@@ -616,6 +539,7 @@ TclpLoadMemoryGetBuffer(
  *----------------------------------------------------------------------
  */
 
+#ifdef TCL_LOAD_FROM_MEMORY
 MODULE_SCOPE int
 TclpLoadMemory(
     Tcl_Interp *interp,		/* Used for error reporting. */
@@ -658,7 +582,7 @@ TclpLoadMemory(
 #	define mh_size  sizeof(struct mach_header_64)
 #	define mh_magic MH_MAGIC_64
 #	define arch_abi CPU_ARCH_ABI64
-#endif
+#endif /*  __LP64__ */
 
 	if ((size_t) codeSize >= sizeof(struct fat_header)
 		&& fh->magic == OSSwapHostToBigInt32(FAT_MAGIC)) {
@@ -668,7 +592,6 @@ TclpLoadMemory(
 	     * Fat binary, try to find mach_header for our architecture
 	     */
 
-	    TclLoadDbgMsg("Fat binary, %d archs", fh_nfat_arch);
 	    if ((size_t) codeSize >= sizeof(struct fat_header) +
 		    fh_nfat_arch * sizeof(struct fat_arch)) {
 		void *fatarchs = (char*)buffer + sizeof(struct fat_header);
@@ -681,22 +604,15 @@ TclpLoadMemory(
 		fa = NXFindBestFatArch(arch->cputype | arch_abi,
 			arch->cpusubtype, fatarchs, fh_nfat_arch);
 		if (fa) {
-		    TclLoadDbgMsg("NXFindBestFatArch() successful: "
-			    "local cputype %d subtype %d, "
-			    "fat cputype %d subtype %d",
-			    arch->cputype | arch_abi, arch->cpusubtype,
-			    fa->cputype, fa->cpusubtype);
-		    mh = (void*)((char*)buffer + fa->offset);
+		    mh = (void *)((char *) buffer + fa->offset);
 		    ms = fa->size;
 		} else {
-		    TclLoadDbgMsg("NXFindBestFatArch() failed");
 		    err = NSObjectFileImageInappropriateFile;
 		}
 		if (fh->magic != FAT_MAGIC) {
 		    swap_fat_arch(fatarchs, fh_nfat_arch, arch->byteorder);
 		}
 	    } else {
-		TclLoadDbgMsg("Fat binary header failure");
 		err = NSObjectFileImageInappropriateFile;
 	    }
 	} else {
@@ -704,26 +620,18 @@ TclpLoadMemory(
 	     * Thin binary
 	     */
 
-	    TclLoadDbgMsg("Thin binary");
 	    mh = buffer;
 	    ms = codeSize;
 	}
 	if (ms && !(ms >= mh_size && mh->magic == mh_magic &&
 		 mh->filetype == MH_BUNDLE)) {
-	    TclLoadDbgMsg("Inappropriate file: magic %x filetype %d",
-		    mh->magic, mh->filetype);
 	    err = NSObjectFileImageInappropriateFile;
 	}
 	if (err == NSObjectFileImageSuccess) {
 	    err = NSCreateObjectFileImageFromMemory(buffer, codeSize,
 		    &dyldObjFileImage);
-	    if (err == NSObjectFileImageSuccess) {
-		TclLoadDbgMsg("NSCreateObjectFileImageFromMemory() "
-			"successful");
-	    } else {
+	    if (err != NSObjectFileImageSuccess) {
 		objFileImageErrMsg = DyldOFIErrorMsg(err);
-		TclLoadDbgMsg("NSCreateObjectFileImageFromMemory() failed: %s",
-			objFileImageErrMsg);
 	    }
 	} else {
 	    objFileImageErrMsg = DyldOFIErrorMsg(err);
@@ -738,8 +646,9 @@ TclpLoadMemory(
     if (dyldObjFileImage == NULL) {
 	vm_deallocate(mach_task_self(), (vm_address_t) buffer, size);
 	if (objFileImageErrMsg != NULL) {
-	    Tcl_AppendResult(interp, "NSCreateObjectFileImageFromMemory() "
-		    "error: ", objFileImageErrMsg, NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "NSCreateObjectFileImageFromMemory() error: ",
+		    objFileImageErrMsg));
 	}
 	return TCL_ERROR;
     }
@@ -751,16 +660,13 @@ TclpLoadMemory(
     module = NSLinkModule(dyldObjFileImage, "[Memory Based Bundle]",
 	    NSLINKMODULE_OPTION_BINDNOW | NSLINKMODULE_OPTION_RETURN_ON_ERROR);
     NSDestroyObjectFileImage(dyldObjFileImage);
-    if (module) {
-	TclLoadDbgMsg("NSLinkModule() successful");
-    } else {
+    if (!module) {
 	NSLinkEditErrors editError;
 	int errorNumber;
 	const char *errorName, *errMsg;
 
 	NSLinkEditError(&editError, &errorNumber, &errorName, &errMsg);
-	TclLoadDbgMsg("NSLinkModule() failed: %s", errMsg);
-	Tcl_AppendResult(interp, errMsg, NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(errMsg, -1));
 	return TCL_ERROR;
     }
 
@@ -772,9 +678,7 @@ TclpLoadMemory(
     modulePtr->module = module;
     modulePtr->nextPtr = NULL;
     dyldLoadHandle = ckalloc(sizeof(Tcl_DyldLoadHandle));
-#if TCL_DYLD_USE_DLFCN
     dyldLoadHandle->dlHandle = NULL;
-#endif
     dyldLoadHandle->dyldLibHeader = NULL;
     dyldLoadHandle->modulePtr = modulePtr;
     newHandle = ckalloc(sizeof(*newHandle));
diff --git a/unix/tclLoadNext.c b/unix/tclLoadNext.c
index c74a29a..06df2db 100644
--- a/unix/tclLoadNext.c
+++ b/unix/tclLoadNext.c
@@ -16,10 +16,9 @@
 
 /* Static procedures defined within this file */
 
-static void* FindSymbol(Tcl_Interp* interp, Tcl_LoadHandle loadHandle,
-			const char* symbol);
-static void UnloadFile(Tcl_LoadHandle loadHandle);
-
+static void *		FindSymbol(Tcl_Interp *interp,
+			    Tcl_LoadHandle loadHandle, const char* symbol);
+static void		UnloadFile(Tcl_LoadHandle loadHandle);
 
 /*
  *----------------------------------------------------------------------
@@ -93,15 +92,15 @@ TclpDlopen(
 	char *data;
 	int len, maxlen;
 
-	NXGetMemoryBuffer(errorStream,&data,&len,&maxlen);
-	Tcl_AppendResult(interp, "couldn't load file \"", fileName, "\": ",
-		data, NULL);
+	NXGetMemoryBuffer(errorStream, &data, &len, &maxlen);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't load file \"%s\": %s", fileName, data));
 	NXCloseMemory(errorStream, NX_FREEBUFFER);
 	return TCL_ERROR;
     }
     NXCloseMemory(errorStream, NX_FREEBUFFER);
 
-    newHandle = ckalloc(sizeof(*newHandle));
+    newHandle = ckalloc(sizeof(Tcl_LoadHandle));
     newHandle->clientData = INT2PTR(1);
     newHandle->findSymbolProcPtr = &FindSymbol;
     newHandle->unloadFileProcPtr = &UnloadFile;
@@ -127,25 +126,25 @@ TclpDlopen(
  *----------------------------------------------------------------------
  */
 
-static void*
+static void *
 FindSymbol(
     Tcl_Interp *interp,
     Tcl_LoadHandle loadHandle,
     const char *symbol)
 {
     Tcl_PackageInitProc *proc = NULL;
-    if (symbol) {
+ 
+   if (symbol) {
 	char sym[strlen(symbol) + 2];
 
 	sym[0] = '_';
 	sym[1] = 0;
 	strcat(sym, symbol);
-	rld_lookup(NULL, sym, (unsigned long *)&proc);
+	rld_lookup(NULL, sym, (unsigned long *) &proc);
     }
     if (proc == NULL && interp != NULL) {
-	Tcl_ResetResult(interp);
-	Tcl_AppendResult(interp, "cannot find symbol \"", symbol,
-			 "\"", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"cannot find symbol \"%s\"", symbol));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "LOAD_SYMBOL", symbol, NULL);
     }
     return proc;
diff --git a/unix/tclLoadOSF.c b/unix/tclLoadOSF.c
index fbd4d5f..6e76b55 100644
--- a/unix/tclLoadOSF.c
+++ b/unix/tclLoadOSF.c
@@ -35,12 +35,14 @@
 #include "tclInt.h"
 #include <sys/types.h>
 #include <loader.h>
-
-/* Static functions defined within this file */
 
-static void* FindSymbol(Tcl_Interp* interp, Tcl_LoadHandle loadHandle,
-		       const char* symbol);
-static void UnloadFile(Tcl_LoadHandle handle);
+/*
+ * Static functions defined within this file.
+ */
+
+static void *		FindSymbol(Tcl_Interp *interp,
+			    Tcl_LoadHandle loadHandle, const char* symbol);
+static void		UnloadFile(Tcl_LoadHandle handle);
 
 /*
  *----------------------------------------------------------------------
@@ -103,8 +105,9 @@ TclpDlopen(
     }
 
     if (lm == LDR_NULL_MODULE) {
-	Tcl_AppendResult(interp, "couldn't load file \"", fileName, "\": ",
-		Tcl_PosixError(interp), NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't load file \"%s\": %s",
+		fileName, Tcl_PosixError(interp)));
 	return TCL_ERROR;
     }
 
@@ -155,10 +158,11 @@ FindSymbol(
     Tcl_LoadHandle loadHandle,
     const char *symbol)
 {
-    void* retval = ldr_lookup_package((char *)loadHandle, symbol);
+    void *retval = ldr_lookup_package((char *) loadHandle, symbol);
+
     if (retval == NULL && interp != NULL) {
-	Tcl_ResetResult(interp);
-	Tcl_AppendResult(interp, "cannot find symbol\"", symbol, "\"", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"cannot find symbol \"%s\"", symbol));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "LOAD_SYMBOL", symbol, NULL);
     }
     return retval;
diff --git a/unix/tclLoadShl.c b/unix/tclLoadShl.c
index eddd80a..7b80bcc 100644
--- a/unix/tclLoadShl.c
+++ b/unix/tclLoadShl.c
@@ -22,14 +22,14 @@
 #endif
 
 #include "tclInt.h"
-
-/* Static functions defined within this file */
 
-static void* FindSymbol(Tcl_Interp* interp, Tcl_LoadHandle loadHandle,
-			const char* symbol);
-static void
-UnloadFile(Tcl_LoadHandle handle);
+/*
+ * Static functions defined within this file.
+ */
 
+static void *		FindSymbol(Tcl_Interp *interp,
+			    Tcl_LoadHandle loadHandle, const char *symbol);
+static void		UnloadFile(Tcl_LoadHandle handle);
 
 /*
  *----------------------------------------------------------------------
@@ -100,8 +100,9 @@ TclpDlopen(
     }
 
     if (handle == NULL) {
-	Tcl_AppendResult(interp, "couldn't load file \"", fileName, "\": ",
-		Tcl_PosixError(interp), (char *) NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't load file \"%s\": %s",
+		fileName, Tcl_PosixError(interp)));
 	return TCL_ERROR;
     }
     newHandle = ckalloc(sizeof(*newHandle));
@@ -136,7 +137,7 @@ FindSymbol(
 {
     Tcl_DString newName;
     Tcl_PackageInitProc *proc = NULL;
-    shl_t handle = (shl_t)(loadHandle->clientData);
+    shl_t handle = (shl_t) loadHandle->clientData;
 
     /*
      * Some versions of the HP system software still use "_" at the beginning
@@ -155,9 +156,9 @@ FindSymbol(
 	Tcl_DStringFree(&newName);
     }
     if (proc == NULL && interp != NULL) {
-	Tcl_ResetResult(interp);
-	Tcl_AppendResult(interp, "cannot find symbol\"", symbol, "\": ",
-		Tcl_PosixError(interp), NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"cannot find symbol \"%s\": %s",
+		symbol, Tcl_PosixError(interp)));
     }
     return proc;
 }
@@ -186,9 +187,8 @@ UnloadFile(
 				 * TclpDlopen(). The loadHandle is a token
 				 * that represents the loaded file. */
 {
-    shl_t handle;
+    shl_t handle = (shl_t) loadHandle->clientData;
 
-    handle = (shl_t) (loadHandle -> clientData);
     shl_unload(handle);
     ckfree(loadHandle);
 }
diff --git a/unix/tclUnixChan.c b/unix/tclUnixChan.c
index 3845c44..9ee37f1 100644
--- a/unix/tclUnixChan.c
+++ b/unix/tclUnixChan.c
@@ -136,10 +136,10 @@ typedef struct TtyAttrs {
 #endif	/* !SUPPORTS_TTY */
 
 #define UNSUPPORTED_OPTION(detail) \
-    if (interp) {						\
-	Tcl_AppendResult(interp, (detail),			\
-		" not supported for this platform", NULL);	\
-	Tcl_SetErrorCode(interp, "TCL", "UNSUPPORTED", NULL);	\
+    if (interp) {							\
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(				\
+		"%s not supported for this platform", (detail)));	\
+	Tcl_SetErrorCode(interp, "TCL", "UNSUPPORTED", NULL);		\
     }
 
 /*
@@ -697,9 +697,9 @@ TtySetOptionProc(
 	    return TCL_ERROR;
 	} else {
 	    if (interp) {
-		Tcl_AppendResult(interp, "bad value for -handshake: "
-			"must be one of xonxoff, rtscts, dtrdsr or none",
-			NULL);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"bad value for -handshake: must be one of"
+			" xonxoff, rtscts, dtrdsr or none", -1));
 		Tcl_SetErrorCode(interp, "TCL", "OPERATION", "FCONFIGURE",
 			"VALUE", NULL);
 	    }
@@ -720,8 +720,9 @@ TtySetOptionProc(
 	    return TCL_ERROR;
 	} else if (argc != 2) {
 	    if (interp) {
-		Tcl_AppendResult(interp, "bad value for -xchar: "
-			"should be a list of two elements", NULL);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"bad value for -xchar: should be a list of"
+			" two elements", -1));
 		Tcl_SetErrorCode(interp, "TCL", "OPERATION", "FCONFIGURE",
 			"VALUE", NULL);
 	    }
@@ -773,8 +774,9 @@ TtySetOptionProc(
 	}
 	if ((argc % 2) == 1) {
 	    if (interp) {
-		Tcl_AppendResult(interp, "bad value for -ttycontrol: "
-			"should be a list of signal,value pairs", NULL);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"bad value for -ttycontrol: should be a list of"
+			" signal,value pairs", -1));
 		Tcl_SetErrorCode(interp, "TCL", "OPERATION", "FCONFIGURE",
 			"VALUE", NULL);
 	    }
@@ -822,9 +824,9 @@ TtySetOptionProc(
 #endif /* SETBREAK */
 	    } else {
 		if (interp) {
-		    Tcl_AppendResult(interp, "bad signal \"", argv[i],
-			    "\" for -ttycontrol: must be "
-			    "DTR, RTS or BREAK", NULL);
+		    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			    "bad signal \"%s\" for -ttycontrol: must be"
+			    " DTR, RTS or BREAK", argv[i]));
 		    Tcl_SetErrorCode(interp, "TCL", "OPERATION", "FCONFIGURE",
 			"VALUE", NULL);
 		}
@@ -1388,8 +1390,8 @@ TtyParseMode(
 	    stopPtr, &end);
     if ((i != 4) || (mode[end] != '\0')) {
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, bad, ": should be baud,parity,data,stop",
-		    NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "%s: should be baud,parity,data,stop", bad));
 	    Tcl_SetErrorCode(interp, "TCL", "VALUE", "SERIALMODE", NULL);
 	}
 	return TCL_ERROR;
@@ -1412,13 +1414,14 @@ TtyParseMode(
 #endif /* PAREXT|USE_TERMIO */
                                == NULL) {
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, bad, " parity: should be ",
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "%s parity: should be %s", bad,
 #if defined(PAREXT) || defined(USE_TERMIO)
-		    "n, o, e, m, or s",
+		    "n, o, e, m, or s"
 #else
-		    "n, o, or e",
+		    "n, o, or e"
 #endif /* PAREXT|USE_TERMIO */
-		    NULL);
+		    ));
 	    Tcl_SetErrorCode(interp, "TCL", "VALUE", "SERIALMODE", NULL);
 	}
 	return TCL_ERROR;
@@ -1426,15 +1429,16 @@ TtyParseMode(
     *parityPtr = parity;
     if ((*dataPtr < 5) || (*dataPtr > 8)) {
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, bad, " data: should be 5, 6, 7, or 8",
-		    NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "%s data: should be 5, 6, 7, or 8", bad));
 	    Tcl_SetErrorCode(interp, "TCL", "VALUE", "SERIALMODE", NULL);
 	}
 	return TCL_ERROR;
     }
     if ((*stopPtr < 0) || (*stopPtr > 2)) {
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, bad, " stop: should be 1 or 2", NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "%s stop: should be 1 or 2", bad));
 	    Tcl_SetErrorCode(interp, "TCL", "VALUE", "SERIALMODE", NULL);
 	}
 	return TCL_ERROR;
@@ -1583,8 +1587,9 @@ TclpOpenFileChannel(
 
     if (fd < 0) {
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "couldn't open \"", TclGetString(pathPtr),
-		    "\": ", Tcl_PosixError(interp), NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "couldn't open \"%s\": %s",
+		    TclGetString(pathPtr), Tcl_PosixError(interp)));
 	}
 	return NULL;
     }
@@ -1842,15 +1847,15 @@ Tcl_GetOpenFile(
     if (chan == NULL) {
 	return TCL_ERROR;
     }
-    if ((forWriting) && ((chanMode & TCL_WRITABLE) == 0)) {
-	Tcl_AppendResult(interp, "\"", chanID, "\" wasn't opened for writing",
-		NULL);
+    if (forWriting && !(chanMode & TCL_WRITABLE)) {
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"\"%s\" wasn't opened for writing", chanID));
 	Tcl_SetErrorCode(interp, "TCL", "VALUE", "CHANNEL", "NOT_WRITABLE",
 		NULL);
 	return TCL_ERROR;
-    } else if ((!forWriting) && ((chanMode & TCL_READABLE) == 0)) {
-	Tcl_AppendResult(interp, "\"", chanID, "\" wasn't opened for reading",
-		NULL);
+    } else if (!forWriting && !(chanMode & TCL_READABLE)) {
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"\"%s\" wasn't opened for reading", chanID));
 	Tcl_SetErrorCode(interp, "TCL", "VALUE", "CHANNEL", "NOT_READABLE",
 		NULL);
 	return TCL_ERROR;
@@ -1881,8 +1886,8 @@ Tcl_GetOpenFile(
 
 	    f = fdopen(fd, (forWriting ? "w" : "r"));
 	    if (f == NULL) {
-		Tcl_AppendResult(interp, "cannot get a FILE * for \"", chanID,
-			"\"", NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"cannot get a FILE * for \"%s\"", chanID));
 		Tcl_SetErrorCode(interp, "TCL", "VALUE", "CHANNEL",
 			"FILE_FAILURE", NULL);
 		return TCL_ERROR;
@@ -1892,8 +1897,8 @@ Tcl_GetOpenFile(
 	}
     }
 
-    Tcl_AppendResult(interp, "\"", chanID,
-	    "\" cannot be used to get a FILE *", NULL);
+    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+	    "\"%s\" cannot be used to get a FILE *", chanID));
     Tcl_SetErrorCode(interp, "TCL", "VALUE", "CHANNEL", "NO_DESCRIPTOR",
 	    NULL);
     return TCL_ERROR;
diff --git a/unix/tclUnixCompat.c b/unix/tclUnixCompat.c
index 3818121..e201018 100644
--- a/unix/tclUnixCompat.c
+++ b/unix/tclUnixCompat.c
@@ -99,12 +99,20 @@ static Tcl_Mutex compatLock;
 #undef NEED_COPYPWD
 #undef NEED_COPYSTRING
 
+#if !defined(HAVE_GETGRNAM_R_5) && !defined(HAVE_GETGRNAM_R_4)
+#define NEED_COPYGRP 1
+static int		CopyGrp(struct group *tgtPtr, char *buf, int buflen);
+#endif
+
+#if !defined(HAVE_GETPWNAM_R_5) && !defined(HAVE_GETPWNAM_R_4)
+#define NEED_COPYPWD 1
+static int		CopyPwd(struct passwd *tgtPtr, char *buf, int buflen);
+#endif
+
 static int		CopyArray(char **src, int elsize, char *buf,
 			    int buflen);
-static int		CopyGrp(struct group *tgtPtr, char *buf, int buflen);
 static int		CopyHostent(struct hostent *tgtPtr, char *buf,
 			    int buflen);
-static int		CopyPwd(struct passwd *tgtPtr, char *buf, int buflen);
 static int		CopyString(const char *src, char *buf, int buflen);
 
 #endif
@@ -214,7 +222,6 @@ TclpGetPwNam(
     return getpwnam_r(name, &tsdPtr->pwd, tsdPtr->pbuf, sizeof(tsdPtr->pbuf));
 
 #else
-#define NEED_COPYPWD 1
     struct passwd *pwPtr;
 
     Tcl_MutexLock(&compatLock);
@@ -295,7 +302,6 @@ TclpGetPwUid(
     return getpwuid_r(uid, &tsdPtr->pwd, tsdPtr->pbuf, sizeof(tsdPtr->pbuf));
 
 #else
-#define NEED_COPYPWD 1
     struct passwd *pwPtr;
 
     Tcl_MutexLock(&compatLock);
@@ -364,7 +370,7 @@ TclpGetGrNam(
 #else
     ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
 
-#ifdef HAVE_GETGRNAM_R_5
+#if defined(HAVE_GETGRNAM_R_5)
     struct group *grPtr = NULL;
 
     /*
@@ -399,7 +405,6 @@ TclpGetGrNam(
     return getgrnam_r(name, &tsdPtr->grp, tsdPtr->gbuf, sizeof(tsdPtr->gbuf));
 
 #else
-#define NEED_COPYGRP 1
     struct group *grPtr;
 
     Tcl_MutexLock(&compatLock);
@@ -480,7 +485,6 @@ TclpGetGrGid(
     return getgrgid_r(gid, &tsdPtr->grp, tsdPtr->gbuf, sizeof(tsdPtr->gbuf));
 
 #else
-#define NEED_COPYGRP 1
     struct group *grPtr;
 
     Tcl_MutexLock(&compatLock);
diff --git a/unix/tclUnixFCmd.c b/unix/tclUnixFCmd.c
index a695e9c..d3cc6bf 100644
--- a/unix/tclUnixFCmd.c
+++ b/unix/tclUnixFCmd.c
@@ -1320,9 +1320,9 @@ GetGroupAttribute(
 
     if (result != 0) {
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "could not read \"",
-		    TclGetString(fileName), "\": ",
-		    Tcl_PosixError(interp), NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "could not read \"%s\": %s",
+		    TclGetString(fileName), Tcl_PosixError(interp)));
 	}
 	return TCL_ERROR;
     }
@@ -1374,9 +1374,9 @@ GetOwnerAttribute(
 
     if (result != 0) {
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "could not read \"",
-		    TclGetString(fileName), "\": ",
-		    Tcl_PosixError(interp), NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "could not read \"%s\": %s",
+		    TclGetString(fileName), Tcl_PosixError(interp)));
 	}
 	return TCL_ERROR;
     }
@@ -1425,9 +1425,9 @@ GetPermissionsAttribute(
 
     if (result != 0) {
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "could not read \"",
-		    TclGetString(fileName), "\": ",
-		    Tcl_PosixError(interp), NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "could not read \"%s\": %s",
+		    TclGetString(fileName), Tcl_PosixError(interp)));
 	}
 	return TCL_ERROR;
     }
@@ -1478,9 +1478,10 @@ SetGroupAttribute(
 
 	if (groupPtr == NULL) {
 	    if (interp != NULL) {
-		Tcl_AppendResult(interp, "could not set group for file \"",
-			TclGetString(fileName), "\": group \"", string,
-			"\" does not exist", NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"could not set group for file \"%s\":"
+			" group \"%s\" does not exist",
+			TclGetString(fileName), string));
 		Tcl_SetErrorCode(interp, "TCL", "OPERATION", "SETGRP",
 			"NO_GROUP", NULL);
 	    }
@@ -1494,9 +1495,9 @@ SetGroupAttribute(
 
     if (result != 0) {
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "could not set group for file \"",
-		    TclGetString(fileName), "\": ", Tcl_PosixError(interp),
-		    NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "could not set group for file \"%s\": %s",
+		    TclGetString(fileName), Tcl_PosixError(interp)));
 	}
 	return TCL_ERROR;
     }
@@ -1544,9 +1545,10 @@ SetOwnerAttribute(
 
 	if (pwPtr == NULL) {
 	    if (interp != NULL) {
-		Tcl_AppendResult(interp, "could not set owner for file \"",
-			TclGetString(fileName), "\": user \"", string,
-			"\" does not exist", NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"could not set owner for file \"%s\":"
+			" user \"%s\" does not exist",
+			TclGetString(fileName), string));
 		Tcl_SetErrorCode(interp, "TCL", "OPERATION", "SETOWN",
 			"NO_USER", NULL);
 	    }
@@ -1560,9 +1562,9 @@ SetOwnerAttribute(
 
     if (result != 0) {
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "could not set owner for file \"",
-		    TclGetString(fileName), "\": ", Tcl_PosixError(interp),
-		    NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "could not set owner for file \"%s\": %s",
+		    TclGetString(fileName), Tcl_PosixError(interp)));
 	}
 	return TCL_ERROR;
     }
@@ -1630,9 +1632,9 @@ SetPermissionsAttribute(
 	result = TclpObjStat(fileName, &buf);
 	if (result != 0) {
 	    if (interp != NULL) {
-		Tcl_AppendResult(interp, "could not read \"",
-			TclGetString(fileName), "\": ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"could not read \"%s\": %s",
+			TclGetString(fileName), Tcl_PosixError(interp)));
 	    }
 	    return TCL_ERROR;
 	}
@@ -1640,8 +1642,9 @@ SetPermissionsAttribute(
 
 	if (GetModeFromPermString(NULL, modeStringPtr, &newMode) != TCL_OK) {
 	    if (interp != NULL) {
-		Tcl_AppendResult(interp, "unknown permission string format \"",
-			modeStringPtr, "\"", NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"unknown permission string format \"%s\"",
+			modeStringPtr));
 		Tcl_SetErrorCode(interp, "TCL", "VALUE", "PERMISSION", NULL);
 	    }
 	    return TCL_ERROR;
@@ -1652,9 +1655,9 @@ SetPermissionsAttribute(
     result = chmod(native, newMode);		/* INTL: Native. */
     if (result != 0) {
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "could not set permissions for file \"",
-		    TclGetString(fileName), "\": ",
-		    Tcl_PosixError(interp), NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "could not set permissions for file \"%s\": %s",
+		    TclGetString(fileName), Tcl_PosixError(interp)));
 	}
 	return TCL_ERROR;
     }
@@ -2239,14 +2242,14 @@ GetReadOnlyAttribute(
 
     if (result != 0) {
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "could not read \"",
-		    TclGetString(fileName), "\": ", Tcl_PosixError(interp),
-		    NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "could not read \"%s\": %s",
+		    TclGetString(fileName), Tcl_PosixError(interp)));
 	}
 	return TCL_ERROR;
     }
 
-    *attributePtrPtr = Tcl_NewBooleanObj((statBuf.st_flags&UF_IMMUTABLE) != 0);
+    *attributePtrPtr = Tcl_NewBooleanObj(statBuf.st_flags&UF_IMMUTABLE);
 
     return TCL_OK;
 }
@@ -2286,9 +2289,9 @@ SetReadOnlyAttribute(
 
     if (result != 0) {
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "could not read \"",
-		    TclGetString(fileName), "\": ", Tcl_PosixError(interp),
-		    NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "could not read \"%s\": %s",
+		    TclGetString(fileName), Tcl_PosixError(interp)));
 	}
 	return TCL_ERROR;
     }
@@ -2303,9 +2306,9 @@ SetReadOnlyAttribute(
     result = chflags(native, statBuf.st_flags);		/* INTL: Native. */
     if (result != 0) {
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "could not set flags for file \"",
-		    TclGetString(fileName), "\": ", Tcl_PosixError(interp),
-		    NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "could not set flags for file \"%s\": %s",
+		    TclGetString(fileName), Tcl_PosixError(interp)));
 	}
 	return TCL_ERROR;
     }
diff --git a/unix/tclUnixFile.c b/unix/tclUnixFile.c
index c213050..38504d9 100644
--- a/unix/tclUnixFile.c
+++ b/unix/tclUnixFile.c
@@ -310,10 +310,9 @@ TclpMatchInDirectory(
 	if (d == NULL) {
 	    Tcl_DStringFree(&ds);
 	    if (interp != NULL) {
-		Tcl_ResetResult(interp);
-		Tcl_AppendResult(interp, "couldn't read directory \"",
-			Tcl_DStringValue(&dsOrig), "\": ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"couldn't read directory \"%s\": %s",
+			Tcl_DStringValue(&dsOrig), Tcl_PosixError(interp)));
 	    }
 	    Tcl_DStringFree(&dsOrig);
 	    Tcl_DecrRefCount(fileNamePtr);
@@ -471,7 +470,7 @@ NativeMatchType(
 #ifndef MAC_OSX_TCL
 	    || ((types->perm & TCL_GLOB_PERM_HIDDEN) &&
 		(*nativeName != '.'))
-#endif
+#endif /* MAC_OSX_TCL */
 		) {
 	    return 0;
 	}
@@ -489,12 +488,10 @@ NativeMatchType(
 		 * check that here:
 		 */
 
-		if (types->type & TCL_GLOB_TYPE_LINK) {
-		    if (TclOSlstat(nativeEntry, &buf) == 0) {
-			if (S_ISLNK(buf.st_mode)) {
-			    return 1;
-			}
-		    }
+		if ((types->type & TCL_GLOB_TYPE_LINK)
+			&& (TclOSlstat(nativeEntry, &buf) == 0)
+			&& S_ISLNK(buf.st_mode)) {
+		    return 1;
 		}
 		return 0;
 	    }
@@ -517,12 +514,10 @@ NativeMatchType(
 	     */
 	} else {
 #ifdef S_ISLNK
-	    if (types->type & TCL_GLOB_TYPE_LINK) {
-		if (TclOSlstat(nativeEntry, &buf) == 0) {
-		    if (S_ISLNK(buf.st_mode)) {
-			goto filetypeOK;
-		    }
-		}
+	    if ((types->type & TCL_GLOB_TYPE_LINK)
+		    && (TclOSlstat(nativeEntry, &buf) == 0)
+		    && S_ISLNK(buf.st_mode)) {
+		goto filetypeOK;
 	    }
 #endif /* S_ISLNK */
 	    return 0;
@@ -718,9 +713,9 @@ TclpGetNativeCwd(
     if (getcwd(buffer, MAXPATHLEN+1) == NULL) {		/* INTL: Native. */
 	return NULL;
     }
-#endif
+#endif /* USEGETWD */
 
-    if ((clientData == NULL) || strcmp(buffer, (const char*)clientData)) {
+    if ((clientData == NULL) || strcmp(buffer, (const char *) clientData)) {
 	char *newCd = ckalloc(strlen(buffer) + 1);
 
 	strcpy(newCd, buffer);
@@ -768,12 +763,12 @@ TclpGetCwd(
     if (getwd(buffer) == NULL)				/* INTL: Native. */
 #else
     if (getcwd(buffer, MAXPATHLEN+1) == NULL)		/* INTL: Native. */
-#endif
+#endif /* USEGETWD */
     {
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp,
-		    "error getting working directory name: ",
-		    Tcl_PosixError(interp), NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "error getting working directory name: %s",
+		    Tcl_PosixError(interp)));
 	}
 	return NULL;
     }
@@ -824,7 +819,7 @@ TclpReadlink(
     return Tcl_DStringValue(linkPtr);
 #else
     return NULL;
-#endif
+#endif /* !DJGPP */
 }
 
 /*
@@ -858,7 +853,7 @@ TclpObjStat(
 
 #ifdef S_IFLNK
 
-Tcl_Obj*
+Tcl_Obj *
 TclpObjLink(
     Tcl_Obj *pathPtr,
     Tcl_Obj *toPtr,
@@ -1180,10 +1175,17 @@ TclpUtime(
 {
     return utime(Tcl_FSGetNativePath(pathPtr), tval);
 }
+
 #ifdef __CYGWIN__
-int TclOSstat(const char *name, Tcl_StatBuf *statBuf) {
+
+int
+TclOSstat(
+    const char *name,
+    Tcl_StatBuf *statBuf)
+{
     struct stat buf;
     int result = stat(name, &buf);
+
     statBuf->st_mode = buf.st_mode;
     statBuf->st_ino = buf.st_ino;
     statBuf->st_dev = buf.st_dev;
@@ -1197,9 +1199,15 @@ int TclOSstat(const char *name, Tcl_StatBuf *statBuf) {
     statBuf->st_ctime = buf.st_ctime;
     return result;
 }
-int TclOSlstat(const char *name, Tcl_StatBuf *statBuf) {
+
+int
+TclOSlstat(
+    const char *name,
+    Tcl_StatBuf *statBuf)
+{
     struct stat buf;
     int result = lstat(name, &buf);
+
     statBuf->st_mode = buf.st_mode;
     statBuf->st_ino = buf.st_ino;
     statBuf->st_dev = buf.st_dev;
@@ -1213,7 +1221,7 @@ int TclOSlstat(const char *name, Tcl_StatBuf *statBuf) {
     statBuf->st_ctime = buf.st_ctime;
     return result;
 }
-#endif
+#endif /* CYGWIN */
 
 /*
  * Local Variables:
diff --git a/unix/tclUnixNotfy.c b/unix/tclUnixNotfy.c
index ca95f40..b87af1b 100644
--- a/unix/tclUnixNotfy.c
+++ b/unix/tclUnixNotfy.c
@@ -96,7 +96,7 @@ typedef struct ThreadSpecificData {
 	 * that an event is ready to be processed
 	 * by sending this event. */
     void *hwnd;			/* Messaging window. */
-#else /* !__CYGWIN__ */
+#else
     Tcl_Condition waitCV;	/* Any other thread alerts a notifier that an
 				 * event is ready to be processed by signaling
 				 * this condition variable. */
@@ -104,7 +104,7 @@ typedef struct ThreadSpecificData {
     int eventReady;		/* True if an event is ready to be processed.
 				 * Used as condition flag together with waitCV
 				 * above. */
-#endif
+#endif /* TCL_THREADS */
 } ThreadSpecificData;
 
 static Tcl_ThreadDataKey dataKey;
@@ -187,25 +187,12 @@ static Tcl_ThreadId notifierThread;
 static void		NotifierThreadProc(ClientData clientData);
 #endif
 static int		FileHandlerEventProc(Tcl_Event *evPtr, int flags);
-
+
 /*
- *----------------------------------------------------------------------
- *
- * Tcl_InitNotifier --
- *
- *	Initializes the platform specific notifier state.
- *
- * Results:
- *	Returns a handle to the notifier state for this thread.
- *
- * Side effects:
- *	None.
- *
- *----------------------------------------------------------------------
+ * Import of Windows API when building threaded with Cygwin.
  */
 
 #if defined(TCL_THREADS) && defined(__CYGWIN__)
-
 typedef struct {
     void *hwnd;
     unsigned int *message;
@@ -217,34 +204,60 @@ typedef struct {
 } MSG;
 
 typedef struct {
-  unsigned int style;
-  void *lpfnWndProc;
-  int cbClsExtra;
-  int cbWndExtra;
-  void *hInstance;
-  void *hIcon;
-  void *hCursor;
-  void *hbrBackground;
-  void *lpszMenuName;
-  void *lpszClassName;
+    unsigned int style;
+    void *lpfnWndProc;
+    int cbClsExtra;
+    int cbWndExtra;
+    void *hInstance;
+    void *hIcon;
+    void *hCursor;
+    void *hbrBackground;
+    void *lpszMenuName;
+    void *lpszClassName;
 } WNDCLASS;
 
-extern unsigned char __stdcall PeekMessageW(MSG *, void *, int, int, int);
-extern unsigned char __stdcall GetMessageW(MSG *, void *, int, int);
-extern unsigned char __stdcall TranslateMessage(const MSG *);
-extern int __stdcall DispatchMessageW(const MSG *);
-extern void __stdcall PostQuitMessage(int);
-extern void * __stdcall CreateWindowExW(void *, void *, void *, DWORD, int, int, int, int, void *, void *, void *, void *);
-extern unsigned char __stdcall DestroyWindow(void *);
-extern unsigned char __stdcall PostMessageW(void *, unsigned int, void *, void *);
-extern void *__stdcall RegisterClassW(const WNDCLASS *);
-extern DWORD __stdcall DefWindowProcW(void *, int, void *, void *);
-extern void *__stdcall CreateEventW(void *, unsigned char, unsigned char, void *);
-extern void __stdcall CloseHandle(void *);
-extern void __stdcall MsgWaitForMultipleObjects(DWORD, void *, unsigned char, DWORD, DWORD);
-extern unsigned char __stdcall ResetEvent(void *);
+extern void __stdcall	CloseHandle(void *);
+extern void *__stdcall	CreateEventW(void *, unsigned char, unsigned char,
+			    void *);
+extern void * __stdcall	CreateWindowExW(void *, void *, void *, DWORD, int,
+			    int, int, int, void *, void *, void *, void *);
+extern DWORD __stdcall	DefWindowProcW(void *, int, void *, void *);
+extern unsigned char __stdcall	DestroyWindow(void *);
+extern int __stdcall	DispatchMessageW(const MSG *);
+extern unsigned char __stdcall	GetMessageW(MSG *, void *, int, int);
+extern void __stdcall	MsgWaitForMultipleObjects(DWORD, void *,
+			    unsigned char, DWORD, DWORD);
+extern unsigned char __stdcall	PeekMessageW(MSG *, void *, int, int, int);
+extern unsigned char __stdcall	PostMessageW(void *, unsigned int, void *,
+				    void *);
+extern void __stdcall	PostQuitMessage(int);
+extern void *__stdcall	RegisterClassW(const WNDCLASS *);
+extern unsigned char __stdcall	ResetEvent(void *);
+extern unsigned char __stdcall	TranslateMessage(const MSG *);
 
-#endif
+/*
+ * Threaded-cygwin specific functions in this file:
+ */
+
+static DWORD __stdcall	NotifierProc(void *hwnd, unsigned int message,
+			    void *wParam, void *lParam);
+#endif /* TCL_THREADS && __CYGWIN__ */
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * Tcl_InitNotifier --
+ *
+ *	Initializes the platform specific notifier state.
+ *
+ * Results:
+ *	Returns a handle to the notifier state for this thread.
+ *
+ * Side effects:
+ *	None.
+ *
+ *----------------------------------------------------------------------
+ */
 
 ClientData
 Tcl_InitNotifier(void)
@@ -403,11 +416,11 @@ Tcl_AlertNotifier(
 
 	Tcl_MutexLock(&notifierMutex);
 	tsdPtr->eventReady = 1;
-#ifdef __CYGWIN__
+#   ifdef __CYGWIN__
 	PostMessageW(tsdPtr->hwnd, 1024, 0, 0);
-#else
+#   else
 	Tcl_ConditionNotify(&tsdPtr->waitCV);
-#endif
+#   endif /* __CYGWIN__ */
 	Tcl_MutexUnlock(&notifierMutex);
 #endif /* TCL_THREADS */
     }
@@ -732,12 +745,12 @@ NotifierProc(
      * Process all of the runnable events.
      */
 
-	tsdPtr->eventReady = 1;
+    tsdPtr->eventReady = 1;
     Tcl_ServiceAll();
     return 0;
 }
-#endif /* __CYGWIN__ */
-
+#endif /* TCL_THREADS && __CYGWIN__ */
+
 /*
  *----------------------------------------------------------------------
  *
@@ -768,9 +781,9 @@ Tcl_WaitForEvent(
 	Tcl_Time vTime;
 #ifdef TCL_THREADS
 	int waitForFiles;
-# ifdef __CYGWIN__
-    MSG msg;
-# endif
+#   ifdef __CYGWIN__
+	MSG msg;
+#   endif /* __CYGWIN__ */
 #else
 	/*
 	 * Impl. notes: timeout & timeoutPtr are used if, and only if threads
@@ -792,8 +805,8 @@ Tcl_WaitForEvent(
 	if (timePtr != NULL) {
 	    /*
 	     * TIP #233 (Virtualized Time). Is virtual time in effect? And do
-	     * we actually have something to scale? If yes to both then we call
-	     * the handler to do this scaling.
+	     * we actually have something to scale? If yes to both then we
+	     * call the handler to do this scaling.
 	     */
 
 	    if (timePtr->sec != 0 || timePtr->usec != 0) {
@@ -807,17 +820,17 @@ Tcl_WaitForEvent(
 	    timeoutPtr = &timeout;
 	} else if (tsdPtr->numFdBits == 0) {
 	    /*
-	     * If there are no threads, no timeout, and no fds registered, then
-	     * there are no events possible and we must avoid deadlock. Note
-	     * that this is not entirely correct because there might be a
-	     * signal that could interrupt the select call, but we don't handle
-	     * that case if we aren't using threads.
+	     * If there are no threads, no timeout, and no fds registered,
+	     * then there are no events possible and we must avoid deadlock.
+	     * Note that this is not entirely correct because there might be a
+	     * signal that could interrupt the select call, but we don't
+	     * handle that case if we aren't using threads.
 	     */
 
 	    return -1;
 	} else {
 	    timeoutPtr = NULL;
-#endif /* TCL_THREADS */
+#endif /* !TCL_THREADS */
 	}
 
 #ifdef TCL_THREADS
@@ -828,7 +841,7 @@ Tcl_WaitForEvent(
 
 #ifdef __CYGWIN__
 	if (!tsdPtr->hwnd) {
-		WNDCLASS class;
+	    WNDCLASS class;
 
 	    class.style = 0;
 	    class.cbClsExtra = 0;
@@ -842,24 +855,24 @@ Tcl_WaitForEvent(
 	    class.hCursor = NULL;
 
 	    RegisterClassW(&class);
-	    tsdPtr->hwnd = CreateWindowExW(NULL, class.lpszClassName, class.lpszClassName,
-		    0, 0, 0, 0, 0, NULL, NULL, TclWinGetTclInstance(), NULL);
+	    tsdPtr->hwnd = CreateWindowExW(NULL, class.lpszClassName,
+		    class.lpszClassName, 0, 0, 0, 0, 0, NULL, NULL,
+		    TclWinGetTclInstance(), NULL);
 	    tsdPtr->event = CreateEventW(NULL, 1 /* manual */,
 		    0 /* !signaled */, NULL);
-    }
-
-#endif
+	}
+#endif /* __CYGWIN */
 
 	Tcl_MutexLock(&notifierMutex);
 
 	if (timePtr != NULL && timePtr->sec == 0 && (timePtr->usec == 0
 #if defined(__APPLE__) && defined(__LP64__)
 		/*
-		 * On 64-bit Darwin, pthread_cond_timedwait() appears to have a
-		 * bug that causes it to wait forever when passed an absolute
-		 * time which has already been exceeded by the system time; as
-		 * a workaround, when given a very brief timeout, just do a
-		 * poll. [Bug 1457797]
+		 * On 64-bit Darwin, pthread_cond_timedwait() appears to have
+		 * a bug that causes it to wait forever when passed an
+		 * absolute time which has already been exceeded by the system
+		 * time; as a workaround, when given a very brief timeout,
+		 * just do a poll. [Bug 1457797]
 		 */
 		|| timePtr->usec < 10
 #endif /* __APPLE__ && __LP64__ */
@@ -883,8 +896,8 @@ Tcl_WaitForEvent(
 	if (waitForFiles) {
 	    /*
 	     * Add the ThreadSpecificData structure of this thread to the list
-	     * of ThreadSpecificData structures of all threads that are waiting
-	     * on file events.
+	     * of ThreadSpecificData structures of all threads that are
+	     * waiting on file events.
 	     */
 
 	    tsdPtr->nextPtr = waitingListPtr;
@@ -909,6 +922,7 @@ Tcl_WaitForEvent(
 #ifdef __CYGWIN__
 	    if (!PeekMessageW(&msg, NULL, 0, 0, 0)) {
 		DWORD timeout;
+
 		if (timePtr) {
 		    timeout = timePtr->sec * 1000 + timePtr->usec / 1000;
 		} else {
@@ -920,7 +934,7 @@ Tcl_WaitForEvent(
 	    }
 #else
 	    Tcl_ConditionWait(&tsdPtr->waitCV, &notifierMutex, timePtr);
-#endif
+#endif /* __CYGWIN__ */
 	}
 	tsdPtr->eventReady = 0;
 
@@ -929,17 +943,20 @@ Tcl_WaitForEvent(
 	    /*
 	     * Retrieve and dispatch the message.
 	     */
+
 	    DWORD result = GetMessageW(&msg, NULL, 0, 0);
+
 	    if (result == 0) {
 		PostQuitMessage(msg.wParam);
 		/* What to do here? */
-	    } else if (result != (DWORD)-1) {
+	    } else if (result != (DWORD) -1) {
 		TranslateMessage(&msg);
 		DispatchMessageW(&msg);
 	    }
 	}
 	ResetEvent(tsdPtr->event);
-#endif
+#endif /* __CYGWIN__ */
+
 	if (waitForFiles && tsdPtr->onList) {
 	    /*
 	     * Remove the ThreadSpecificData structure of this thread from the
@@ -1211,9 +1228,9 @@ NotifierThreadProc(
 		    tsdPtr->pollState = 0;
 		}
 #ifdef __CYGWIN__
-	    PostMessageW(tsdPtr->hwnd, 1024, 0, 0);
-#else /* __CYGWIN__ */
-	    Tcl_ConditionNotify(&tsdPtr->waitCV);
+		PostMessageW(tsdPtr->hwnd, 1024, 0, 0);
+#else
+		Tcl_ConditionNotify(&tsdPtr->waitCV);
 #endif /* __CYGWIN__ */
 	    }
 	}
@@ -1255,7 +1272,7 @@ NotifierThreadProc(
 }
 #endif /* TCL_THREADS */
 
-#endif /* HAVE_COREFOUNDATION */
+#endif /* !HAVE_COREFOUNDATION */
 
 /*
  * Local Variables:
diff --git a/unix/tclUnixPipe.c b/unix/tclUnixPipe.c
index 377b84b..654c9d8 100644
--- a/unix/tclUnixPipe.c
+++ b/unix/tclUnixPipe.c
@@ -267,35 +267,34 @@ TclpTempFileName(void)
 }
 
 /*
- *-----------------------------------------------------------------------------
+ *----------------------------------------------------------------------------
  *
  * TclpTempFileNameForLibrary --
  *
- *	Constructs a file name in the native file system where a
- *	dynamically loaded library may be placed.
+ *	Constructs a file name in the native file system where a dynamically
+ *	loaded library may be placed.
  *
  * Results:
- *	Returns the constructed file name. If an error occurs,
- *	returns NULL and leaves an error message in the interpreter
- *	result.
+ *	Returns the constructed file name. If an error occurs, returns NULL
+ *	and leaves an error message in the interpreter result.
  *
- * On Unix, it works to load a shared object from a file of any
- * name, so this function is merely a thin wrapper around
- * TclpTempFileName().
+ * On Unix, it works to load a shared object from a file of any name, so this
+ * function is merely a thin wrapper around TclpTempFileName().
  *	
- *-----------------------------------------------------------------------------
+ *----------------------------------------------------------------------------
  */
 
-Tcl_Obj*
-TclpTempFileNameForLibrary(Tcl_Interp* interp, /* Tcl interpreter */
-			   Tcl_Obj* path)      /* Path name of the library
-						* in the VFS */
+Tcl_Obj *
+TclpTempFileNameForLibrary(
+    Tcl_Interp *interp,		/* Tcl interpreter. */
+    Tcl_Obj *path)		/* Path name of the library in the VFS. */
 {
-    Tcl_Obj* retval;
-    retval = TclpTempFileName();
+    Tcl_Obj *retval = TclpTempFileName();
+
     if (retval == NULL) {
-	Tcl_AppendResult(interp, "couldn't create temporary file: ",
-		Tcl_PosixError(interp), NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't create temporary file: %s",
+		Tcl_PosixError(interp)));
     }
     return retval;
 }
@@ -442,8 +441,8 @@ TclpCreateProcess(
      */
 
     if (TclpCreatePipe(&errPipeIn, &errPipeOut) == 0) {
-	Tcl_AppendResult(interp, "couldn't create pipe: ",
-		Tcl_PosixError(interp), NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't create pipe: %s", Tcl_PosixError(interp)));
 	goto error;
     }
 
@@ -463,8 +462,9 @@ TclpCreateProcess(
     /*
      * After vfork(), do not call code in the child that changes global state,
      * because it is using the parent's memory space at that point and writes
-     * might corrupt the parent: so ensure standard channels are initialized in
-     * the parent, otherwise SetupStdFile() might initialize them in the child.
+     * might corrupt the parent: so ensure standard channels are initialized
+     * in the parent, otherwise SetupStdFile() might initialize them in the
+     * child.
      */
 
     if (!inputFile) {
@@ -495,7 +495,7 @@ TclpCreateProcess(
 		|| (joinThisError &&
 			((dup2(1,2) == -1) || (fcntl(2, F_SETFD, 0) != 0)))) {
 	    sprintf(errSpace,
-		    "%dforked process couldn't set up input/output: ", errno);
+		    "%dforked process couldn't set up input/output", errno);
 	    len = strlen(errSpace);
 	    if (len != (size_t) write(fd, errSpace, len)) {
 		    Tcl_Panic("TclpCreateProcess: unable to write to errPipeOut");
@@ -509,11 +509,11 @@ TclpCreateProcess(
 
 	RestoreSignals();
 	execvp(newArgv[0], newArgv);			/* INTL: Native. */
-	sprintf(errSpace, "%dcouldn't execute \"%.150s\": ", errno, argv[0]);
+	sprintf(errSpace, "%dcouldn't execute \"%.150s\"", errno, argv[0]);
 	len = strlen(errSpace);
-    if (len != (size_t) write(fd, errSpace, len)) {
+	if (len != (size_t) write(fd, errSpace, len)) {
 	    Tcl_Panic("TclpCreateProcess: unable to write to errPipeOut");
-    }
+	}
 	_exit(1);
     }
 
@@ -528,8 +528,8 @@ TclpCreateProcess(
     TclStackFree(interp, dsArray);
 
     if (pid == -1) {
-	Tcl_AppendResult(interp, "couldn't fork child process: ",
-		Tcl_PosixError(interp), NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't fork child process: %s", Tcl_PosixError(interp)));
 	goto error;
     }
 
@@ -546,9 +546,11 @@ TclpCreateProcess(
     count = read(fd, errSpace, (size_t) (sizeof(errSpace) - 1));
     if (count > 0) {
 	char *end;
+
 	errSpace[count] = 0;
 	errno = strtol(errSpace, &end, 10);
-	Tcl_AppendResult(interp, end, Tcl_PosixError(interp), NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf("%s: %s",
+		end, Tcl_PosixError(interp)));
 	goto error;
     }
 
@@ -832,8 +834,8 @@ Tcl_CreatePipe(
     int fileNums[2];
 
     if (pipe(fileNums) < 0) {
-	Tcl_AppendResult(interp, "pipe creation failed: ",
-		Tcl_PosixError(interp), NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf("pipe creation failed: %s",
+		Tcl_PosixError(interp)));
 	return TCL_ERROR;
     }
 
diff --git a/unix/tclUnixSock.c b/unix/tclUnixSock.c
index 1e9d4eb..102c620 100644
--- a/unix/tclUnixSock.c
+++ b/unix/tclUnixSock.c
@@ -21,10 +21,10 @@
 #define CLEAR_BITS(var, bits)	((var) &= ~(bits))
 
 /* "sock" + a pointer in hex + \0 */
-#define SOCK_CHAN_LENGTH 4 + sizeof(void*) * 2 + 1
-#define SOCK_TEMPLATE "sock%lx"
+#define SOCK_CHAN_LENGTH        (4 + sizeof(void *) * 2 + 1)
+#define SOCK_TEMPLATE           "sock%lx"
 
-#undef SOCKET /* Possible conflict with win32 SOCKET */
+#undef SOCKET   /* Possible conflict with win32 SOCKET */
 
 /*
  * This is needed to comply with the strict aliasing rules of GCC, but it also
@@ -58,19 +58,23 @@ struct TcpState {
     /*
      * Only needed for server sockets
      */
-    Tcl_TcpAcceptProc *acceptProc; /* Proc to call on accept. */
-    ClientData acceptProcData;     /* The data for the accept proc. */
+
+    Tcl_TcpAcceptProc *acceptProc;
+                                /* Proc to call on accept. */
+    ClientData acceptProcData;  /* The data for the accept proc. */
+
     /*
      * Only needed for client sockets
      */
-    struct addrinfo *addrlist;	 /* addresses to connect to        */
-    struct addrinfo *addr;	 /* iterator over addrlist         */
-    struct addrinfo *myaddrlist; /* local address                  */
-    struct addrinfo *myaddr;	 /* iterator over myaddrlist       */
-    int filehandlers;	/* Caches FileHandlers that get set up while
-                         * an async socket is not yet connected   */
-    int status;         /* Cache status of async socket */
-    int cachedBlocking; /* Cache blocking mode of async socket */
+
+    struct addrinfo *addrlist;	/* Addresses to connect to. */
+    struct addrinfo *addr;	/* Iterator over addrlist. */
+    struct addrinfo *myaddrlist;/* Local address. */
+    struct addrinfo *myaddr;	/* Iterator over myaddrlist. */
+    int filehandlers;           /* Caches FileHandlers that get set up while
+                                 * an async socket is not yet connected. */
+    int status;                 /* Cache status of async socket. */
+    int cachedBlocking;         /* Cache blocking mode of async socket. */
 };
 
 /*
@@ -90,9 +94,7 @@ struct TcpState {
 
 #ifndef SOMAXCONN
 #   define SOMAXCONN	100
-#endif /* SOMAXCONN */
-
-#if (SOMAXCONN < 100)
+#elif (SOMAXCONN < 100)
 #   undef  SOMAXCONN
 #   define SOMAXCONN	100
 #endif /* SOMAXCONN < 100 */
@@ -217,7 +219,7 @@ InitializeHostName(
     if (native == NULL) {
 	native = tclEmptyStringRep;
     }
-#else
+#else /* !NO_UNAME */
     /*
      * Uname doesn't exist; try gethostname instead.
      *
@@ -242,7 +244,7 @@ InitializeHostName(
     if (gethostname(buffer, sizeof(buffer)) > -1) {	/* INTL: Native. */
 	native = buffer;
     }
-#endif
+#endif /* NO_UNAME */
 
     *encodingPtr = Tcl_GetEncoding(NULL, NULL);
     *lengthPtr = strlen(native);
@@ -344,7 +346,7 @@ TcpBlockModeProc(
 				 * TCL_MODE_BLOCKING or
 				 * TCL_MODE_NONBLOCKING. */
 {
-    TcpState *statePtr = (TcpState *) instanceData;
+    TcpState *statePtr = instanceData;
 
     if (mode == TCL_MODE_BLOCKING) {
 	CLEAR_BITS(statePtr->flags, TCP_ASYNC_SOCKET);
@@ -443,7 +445,7 @@ TcpInputProc(
 				 * buffer? */
     int *errorCodePtr)		/* Where to store error code. */
 {
-    TcpState *statePtr = (TcpState *) instanceData;
+    TcpState *statePtr = instanceData;
     int bytesRead;
 
     *errorCodePtr = 0;
@@ -493,7 +495,7 @@ TcpOutputProc(
     int toWrite,		/* How many bytes to write? */
     int *errorCodePtr)		/* Where to store error code. */
 {
-    TcpState *statePtr = (TcpState *) instanceData;
+    TcpState *statePtr = instanceData;
     int written;
 
     *errorCodePtr = 0;
@@ -532,7 +534,7 @@ TcpCloseProc(
     ClientData instanceData,	/* The socket to close. */
     Tcl_Interp *interp)		/* For error reporting - unused. */
 {
-    TcpState *statePtr = (TcpState *) instanceData;
+    TcpState *statePtr = instanceData;
     int errorCode = 0;
     TcpFdList *fds;
 
@@ -593,7 +595,7 @@ TcpClose2Proc(
     Tcl_Interp *interp,		/* For error reporting. */
     int flags)			/* Flags that indicate which side to close. */
 {
-    TcpState *statePtr = (TcpState *) instanceData;
+    TcpState *statePtr = instanceData;
     int errorCode = 0;
     int sd;
 
@@ -610,8 +612,8 @@ TcpClose2Proc(
         break;
     default:
         if (interp) {
-            Tcl_AppendResult(interp,
-                    "Socket close2proc called bidirectionally", NULL);
+            Tcl_SetObjResult(interp, Tcl_NewStringObj(
+                    "socket close2proc called bidirectionally", -1));
         }
         return TCL_ERROR;
     }
@@ -653,7 +655,7 @@ TcpGetOptionProc(
     Tcl_DString *dsPtr)		/* Where to store the computed value;
 				 * initialized by caller. */
 {
-    TcpState *statePtr = (TcpState *) instanceData;
+    TcpState *statePtr = instanceData;
     char host[NI_MAXHOST], port[NI_MAXSERV];
     size_t len = 0;
     int reverseDNS = 0;
@@ -670,7 +672,7 @@ TcpGetOptionProc(
 
         if (statePtr->status == 0) {
             ret = getsockopt(statePtr->fds.fd, SOL_SOCKET, SO_ERROR,
-                             (char *)&err, &optlen);
+                    (char *) &err, &optlen);
             if (ret < 0) {
                 err = errno;
             }
@@ -688,9 +690,8 @@ TcpGetOptionProc(
         reverseDNS = NI_NUMERICHOST;
     }
     
-    if ((len == 0) ||
-	    ((len > 1) && (optionName[1] == 'p') &&
-		    (strncmp(optionName, "-peername", len) == 0))) {
+    if ((len == 0) || ((len > 1) && (optionName[1] == 'p') &&
+	    (strncmp(optionName, "-peername", len) == 0))) {
         address peername;
         socklen_t size = sizeof(peername);
 
@@ -721,16 +722,16 @@ TcpGetOptionProc(
 
 	    if (len) {
 		if (interp) {
-		    Tcl_AppendResult(interp, "can't get peername: ",
-			    Tcl_PosixError(interp), NULL);
+		    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+                            "can't get peername: %s",
+			    Tcl_PosixError(interp)));
 		}
 		return TCL_ERROR;
 	    }
 	}
     }
 
-    if ((len == 0) ||
-	    ((len > 1) && (optionName[1] == 's') &&
+    if ((len == 0) || ((len > 1) && (optionName[1] == 's') &&
 	    (strncmp(optionName, "-sockname", len) == 0))) {
 	TcpFdList *fds;
         address sockname;
@@ -772,7 +773,7 @@ TcpGetOptionProc(
                             sockname.sa6.sin6_addr.s6_addr[15] == 0)) {
                         flags |= NI_NUMERICHOST;
                     }
-#endif
+#endif /* NEED_FAKE_RFC2553 */
                 }
 		getnameinfo(&sockname.sa, size, host, sizeof(host), port,
                         sizeof(port), flags);
@@ -787,8 +788,8 @@ TcpGetOptionProc(
             Tcl_DStringEndSublist(dsPtr);
         } else {
             if (interp) {
-                Tcl_AppendResult(interp, "can't get sockname: ",
-                        Tcl_PosixError(interp), NULL);
+                Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+                        "can't get sockname: %s", Tcl_PosixError(interp)));
             }
 	    return TCL_ERROR;
 	}
@@ -825,7 +826,7 @@ TcpWatchProc(
 				 * TCL_READABLE, TCL_WRITABLE and
 				 * TCL_EXCEPTION. */
 {
-    TcpState *statePtr = (TcpState *) instanceData;
+    TcpState *statePtr = instanceData;
 
     if (statePtr->acceptProc != NULL) {
         /*
@@ -842,8 +843,7 @@ TcpWatchProc(
         statePtr->filehandlers = mask;
     } else if (mask) {
         Tcl_CreateFileHandler(statePtr->fds.fd, mask,
-                              (Tcl_FileProc *) Tcl_NotifyChannel,
-                              (ClientData) statePtr->channel);
+                (Tcl_FileProc *) Tcl_NotifyChannel, statePtr->channel);
     } else {
         Tcl_DeleteFileHandler(statePtr->fds.fd);
     }
@@ -874,7 +874,7 @@ TcpGetHandleProc(
     int direction,		/* Not used. */
     ClientData *handlePtr)	/* Where to store the handle. */
 {
-    TcpState *statePtr = (TcpState *) instanceData;
+    TcpState *statePtr = instanceData;
 
     *handlePtr = INT2PTR(statePtr->fds.fd);
     return TCL_OK;
@@ -946,12 +946,11 @@ CreateClientSocket(
     }
 
     for (state->addr = state->addrlist; state->addr != NULL;
-         state->addr = state->addr->ai_next) {
-
+            state->addr = state->addr->ai_next) {
 	status = -1;
 
         for (state->myaddr = state->myaddrlist; state->myaddr != NULL;
-             state->myaddr = state->myaddr->ai_next) {
+                state->myaddr = state->myaddr->ai_next) {
             int reuseaddr;
             
 	    /*
@@ -967,6 +966,7 @@ CreateClientSocket(
              * Close the socket if it is still open from the last unsuccessful
              * iteration.
              */
+
             if (state->fds.fd >= 0) {
 		close(state->fds.fd);
 		state->fds.fd = -1;
@@ -991,7 +991,8 @@ CreateClientSocket(
 	    TclSockMinimumBuffers(INT2PTR(state->fds.fd), SOCKET_BUFSIZE);
     
 	    if (async) {
-		status = TclUnixSetBlockingMode(state->fds.fd, TCL_MODE_NONBLOCKING);
+		status = TclUnixSetBlockingMode(state->fds.fd,
+                        TCL_MODE_NONBLOCKING);
 		if (status < 0) {
                     continue;
 		}
@@ -1001,7 +1002,7 @@ CreateClientSocket(
             (void) setsockopt(state->fds.fd, SOL_SOCKET, SO_REUSEADDR,
                     (char *) &reuseaddr, sizeof(reuseaddr));
             status = bind(state->fds.fd, state->myaddr->ai_addr,
-                          state->myaddr->ai_addrlen);
+                    state->myaddr->ai_addrlen);
             if (status < 0) {
                 continue;
             }
@@ -1014,24 +1015,25 @@ CreateClientSocket(
 	     */
 	    
 	    status = connect(state->fds.fd, state->addr->ai_addr,
-                             state->addr->ai_addrlen);
+                    state->addr->ai_addrlen);
 	    if (status < 0 && errno == EINPROGRESS) {
                 Tcl_CreateFileHandler(state->fds.fd,
-                                      TCL_WRITABLE | TCL_EXCEPTION,
-                                      TcpAsyncCallback, state);
+                        TCL_WRITABLE|TCL_EXCEPTION, TcpAsyncCallback, state);
                 return TCL_OK;
 
             reenter:
                 Tcl_DeleteFileHandler(state->fds.fd);
+
                 /*
                  * Read the error state from the socket to see if the async
                  * connection has succeeded or failed. As this clears the
                  * error condition, we cache the status in the socket state
                  * struct for later retrieval by [fconfigure -error].
                  */
+
                 optlen = sizeof(int);
                 getsockopt(state->fds.fd, SOL_SOCKET, SO_ERROR,
-                           (char *)&status, &optlen);
+                        (char *) &status, &optlen);
                 state->status = status;
             }
 	    if (status == 0) {
@@ -1047,6 +1049,7 @@ out:
         /*
          * An asynchonous connection has finally succeeded or failed.
          */
+
         TcpWatchProc(state, state->filehandlers);
         TclUnixSetBlockingMode(state->fds.fd, state->cachedBlocking);
 
@@ -1058,17 +1061,18 @@ out:
          * hurt that this is also called in the successful case and will save
          * the event mechanism one roundtrip through select().
          */
-        Tcl_NotifyChannel(state->channel, TCL_WRITABLE);
 
+        Tcl_NotifyChannel(state->channel, TCL_WRITABLE);
     } else if (status != 0) {
         /*
          * Failure for either a synchronous connection, or an async one that
          * failed before it could enter background mode, e.g. because an
          * invalid -myaddr was given.
          */
+
         if (interp != NULL) {
-            Tcl_AppendResult(interp, "couldn't open socket: ",
-                             Tcl_PosixError(interp), NULL);
+            Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+                    "couldn't open socket: %s", Tcl_PosixError(interp)));
         }
         return TCL_ERROR;
     }
@@ -1111,13 +1115,16 @@ Tcl_OpenTcpClient(
     /*
      * Do the name lookups for the local and remote addresses.
      */
-    if (!TclCreateSocketAddress(interp, &addrlist, host, port, 0, &errorMsg) ||
-        !TclCreateSocketAddress(interp, &myaddrlist, myaddr, myport, 1, &errorMsg)) {
+
+    if (!TclCreateSocketAddress(interp, &addrlist, host, port, 0, &errorMsg)
+            || !TclCreateSocketAddress(interp, &myaddrlist, myaddr, myport, 1,
+                    &errorMsg)) {
         if (addrlist != NULL) {
             freeaddrinfo(addrlist);
         }
         if (interp != NULL) {
-            Tcl_AppendResult(interp, "couldn't open socket: ", errorMsg, NULL);
+            Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+                    "couldn't open socket: %s", errorMsg));
         }
         return NULL;
     }
@@ -1141,10 +1148,10 @@ Tcl_OpenTcpClient(
         return NULL;
     }
 
-    sprintf(channelName, SOCK_TEMPLATE, (long)state);
+    sprintf(channelName, SOCK_TEMPLATE, (long) state);
 
-    state->channel = Tcl_CreateChannel(&tcpChannelType, channelName,
-                                       state, (TCL_READABLE | TCL_WRITABLE));
+    state->channel = Tcl_CreateChannel(&tcpChannelType, channelName, state,
+            (TCL_READABLE | TCL_WRITABLE));
     if (Tcl_SetChannelOption(interp, state->channel, "-translation",
 	    "auto crlf") == TCL_ERROR) {
 	Tcl_Close(NULL, state->channel);
@@ -1257,6 +1264,7 @@ Tcl_OpenTcpServer(
      * Try to record and return the most meaningful error message, i.e. the
      * one from the first socket that went the farthest before it failed.
      */
+
     enum { LOOKUP, SOCKET, BIND, LISTEN } howfar = LOOKUP;
     int my_errno = 0;
 
@@ -1267,7 +1275,7 @@ Tcl_OpenTcpServer(
 
     for (addrPtr = addrlist; addrPtr != NULL; addrPtr = addrPtr->ai_next) {
 	sock = socket(addrPtr->ai_family, addrPtr->ai_socktype,
-                      addrPtr->ai_protocol);
+                addrPtr->ai_protocol);
 	if (sock == -1) {
 	    if (howfar < SOCKET) {
 		howfar = SOCKET;
@@ -1318,7 +1326,7 @@ Tcl_OpenTcpServer(
             (void) setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY,
                     &v6only, sizeof(v6only));
         }
-#endif
+#endif /* IPV6_V6ONLY */
 
 	status = bind(sock, addrPtr->ai_addr, addrPtr->ai_addrlen);
         if (status == -1) {
@@ -1360,7 +1368,7 @@ Tcl_OpenTcpServer(
             memset(statePtr, 0, sizeof(TcpState));
             statePtr->acceptProc = acceptProc;
             statePtr->acceptProcData = acceptProcData;
-            sprintf(channelName, SOCK_TEMPLATE, (long)statePtr);
+            sprintf(channelName, SOCK_TEMPLATE, (long) statePtr);
             newfds = &statePtr->fds;
         } else {
             newfds = ckalloc(sizeof(TcpFdList));
@@ -1389,13 +1397,15 @@ Tcl_OpenTcpServer(
 	return statePtr->channel;
     }
     if (interp != NULL) {
-	Tcl_AppendResult(interp, "couldn't open socket: ", NULL);
+        Tcl_Obj *errorObj = Tcl_NewStringObj("couldn't open socket: ", -1);
+
 	if (errorMsg == NULL) {
             errno = my_errno;
-            Tcl_AppendResult(interp, Tcl_PosixError(interp), NULL);
+            Tcl_AppendToObj(errorObj, Tcl_PosixError(interp), -1);
         } else {
-	    Tcl_AppendResult(interp, errorMsg, NULL);
+	    Tcl_AppendToObj(errorObj, errorMsg, -1);
 	}
+        Tcl_SetObjResult(interp, errorObj);
     }
     if (sock != -1) {
 	close(sock);
@@ -1434,7 +1444,7 @@ TcpAccept(
     char host[NI_MAXHOST], port[NI_MAXSERV];
     
     len = sizeof(addr);
-    newsock = accept(fds->fd, &(addr.sa), &len);
+    newsock = accept(fds->fd, &addr.sa, &len);
     if (newsock < 0) {
 	return;
     }
@@ -1451,7 +1461,7 @@ TcpAccept(
     newSockState->flags = 0;
     newSockState->fds.fd = newsock;
 
-    sprintf(channelName, SOCK_TEMPLATE, (long)newSockState);
+    sprintf(channelName, SOCK_TEMPLATE, (long) newSockState);
     newSockState->channel = Tcl_CreateChannel(&tcpChannelType, channelName,
 	    newSockState, (TCL_READABLE | TCL_WRITABLE));
 
@@ -1459,7 +1469,7 @@ TcpAccept(
 	    "auto crlf");
 
     if (fds->statePtr->acceptProc != NULL) {
-	getnameinfo(&(addr.sa), len, host, sizeof(host), port, sizeof(port),
+	getnameinfo(&addr.sa, len, host, sizeof(host), port, sizeof(port),
                 NI_NUMERICHOST|NI_NUMERICSERV);
 	fds->statePtr->acceptProc(fds->statePtr->acceptProcData,
                 newSockState->channel, host, atoi(port));
diff --git a/unix/tclooConfig.sh b/unix/tclooConfig.sh
index 68de106..dce540a 100644
--- a/unix/tclooConfig.sh
+++ b/unix/tclooConfig.sh
@@ -16,4 +16,4 @@ TCLOO_STUB_LIB_SPEC=""
 TCLOO_INCLUDE_SPEC=""
 TCLOO_PRIVATE_INCLUDE_SPEC=""
 TCLOO_CFLAGS=-DUSE_TCLOO_STUBS
-TCLOO_VERSION=0.6.3
+TCLOO_VERSION=0.7
diff --git a/win/Makefile.in b/win/Makefile.in
index 84dcaf7..fad1f09 100644
--- a/win/Makefile.in
+++ b/win/Makefile.in
@@ -90,7 +90,7 @@ COMPILE_DEBUG_FLAGS =
 
 SRC_DIR			= @srcdir@
 ROOT_DIR		= @srcdir@/..
-TOP_DIR			= $(shell cd @srcdir@/..; pwd)
+TOP_DIR			= $(shell cd @srcdir@/..; pwd -P)
 GENERIC_DIR		= $(TOP_DIR)/generic
 TOMMATH_DIR		= $(TOP_DIR)/libtommath
 WIN_DIR			= $(TOP_DIR)/win
@@ -112,7 +112,7 @@ ROOT_DIR_NATIVE		= $(shell $(CYGPATH) '$(ROOT_DIR)' | sed 's!\\!/!g')
 
 # Fully qualify library path so that `make test`
 # does not depend on the current directory.
-LIBRARY_DIR1		= $(shell cd '$(ROOT_DIR_NATIVE)/library' ; pwd)
+LIBRARY_DIR1		= $(shell cd '$(ROOT_DIR_NATIVE)/library' ; pwd -P)
 LIBRARY_DIR             = $(shell $(CYGPATH) '$(LIBRARY_DIR1)' | sed 's!\\!/!g')
 DLLSUFFIX		= @DLLSUFFIX@
 LIBSUFFIX		= @LIBSUFFIX@
@@ -439,12 +439,6 @@ ${TCL_LIB_FILE}: ${TCL_OBJS} ${DDE_OBJS} ${REG_OBJS}
 	@MAKE_LIB@ ${TCL_OBJS} ${DDE_OBJS} ${REG_OBJS}
 	@POST_MAKE_LIB@
 
-# assume GNU make
-
-# To enable concurrent parallel make of tcl<x>.dll and tcl<x>.lib, the tcl<x>.dll
-# targets have to depend on tcl<x>.lib, this ensures that linking of tcl<x>.dll
-# does not execute concurrently with the renaming and recompiling of tcl<x>.lib
-
 ${DDE_DLL_FILE}: ${DDE_OBJS} ${TCL_STUB_LIB_FILE}
 	@MAKE_DLL@ ${DDE_OBJS} $(TCL_STUB_LIB_FILE) $(SHLIB_LD_LIBS)
 
@@ -456,8 +450,12 @@ ${TEST_DLL_FILE}: ${TCLTEST_OBJS} ${TCL_STUB_LIB_FILE}
 	@MAKE_DLL@ ${TCLTEST_OBJS} $(TCL_STUB_LIB_FILE) $(SHLIB_LD_LIBS)
 
 # use pre-built zlib1.dll
-${ZLIB_DLL_FILE}: $(ZLIB_DIR)/win32/${ZLIB_DLL_FILE}
-	@$(COPY) $(ZLIB_DIR)/win32/${ZLIB_DLL_FILE} ${ZLIB_DLL_FILE}
+${ZLIB_DLL_FILE}: ${TCL_STUB_LIB_FILE}
+	@if test "@ZLIB_LIBS@set" == "${ZLIB_DIR}/win64/zdll.libset" ; then \
+		$(COPY) $(ZLIB_DIR)/win64/${ZLIB_DLL_FILE} ${ZLIB_DLL_FILE}; \
+	else \
+		$(COPY) $(ZLIB_DIR)/win32/${ZLIB_DLL_FILE} ${ZLIB_DLL_FILE}; \
+	fi;
 
 # Add the object extension to the implicit rules. By default .obj is not
 # automatically added.
@@ -540,9 +538,9 @@ gendate:
 # run (and the results checked) after updating to a new release of libtommath.
 
 gentommath_h:
-	$(TCL_EXE) "$(ROOT_DIR_NATIVE)\tools\fix_tommath_h.tcl" \
-		"$(TOMMATH_DIR_NATIVE)\tommath.h" \
-		> "$(GENERIC_DIR_NATIVE)\tclTomMath.h"
+	$(TCL_EXE) "$(ROOT_DIR_NATIVE)/tools/fix_tommath_h.tcl" \
+		"$(TOMMATH_DIR_NATIVE)/tommath.h" \
+		> "$(GENERIC_DIR_NATIVE)/tclTomMath.h"
 
 install: all install-binaries install-libraries install-doc install-packages
 
@@ -643,8 +641,8 @@ install-libraries: libraries install-tzdata install-msgs
 	    do \
 	    $(COPY) "$$j" "$(SCRIPT_INSTALL_DIR)/opt0.4"; \
 	    done;
-	@echo "Installing package msgcat 1.4.5 as a Tcl Module";
-	@$(COPY) $(ROOT_DIR)/library/msgcat/msgcat.tcl $(SCRIPT_INSTALL_DIR)/../tcl8/8.5/msgcat-1.4.5.tm;
+	@echo "Installing package msgcat 1.5.0 as a Tcl Module";
+	@$(COPY) $(ROOT_DIR)/library/msgcat/msgcat.tcl $(SCRIPT_INSTALL_DIR)/../tcl8/8.5/msgcat-1.5.0.tm;
 	@echo "Installing package tcltest 2.3.4 as a Tcl Module";
 	@$(COPY) $(ROOT_DIR)/library/tcltest/tcltest.tcl $(SCRIPT_INSTALL_DIR)/../tcl8/8.5/tcltest-2.3.4.tm;
 	@echo "Installing package platform 1.0.10 as a Tcl Module";
@@ -697,14 +695,14 @@ test-tcl: binaries $(TCLSH) $(CAT32) $(TEST_DLL_FILE)
 	TCL_LIBRARY="$(LIBRARY_DIR)"; export TCL_LIBRARY; \
 	./$(TCLSH) "$(ROOT_DIR_NATIVE)/tests/all.tcl" $(TESTFLAGS) \
 	-load "package ifneeded Tcltest ${VERSION}@TCL_PATCH_LEVEL@ [list load [file normalize ${TEST_DLL_FILE}] Tcltest]; \
-	package ifneeded dde 1.4.0b1 [list load [file normalize ${DDE_DLL_FILE}] dde]; \
+	package ifneeded dde 1.4.0b2 [list load [file normalize ${DDE_DLL_FILE}] dde]; \
 	package ifneeded registry 1.3.0 [list load [file normalize ${REG_DLL_FILE}] registry]" | ./$(CAT32)
 
 # Useful target to launch a built tclsh with the proper path,...
 runtest: binaries $(TCLSH) $(TEST_DLL_FILE)
 	@TCL_LIBRARY="$(LIBRARY_DIR)"; export TCL_LIBRARY; \
 	./$(TCLSH) $(TESTFLAGS) -load "package ifneeded Tcltest ${VERSION}@TCL_PATCH_LEVEL@ [list load [file normalize ${TEST_DLL_FILE}] Tcltest]; \
-	package ifneeded dde 1.4.0b1 [list load [file normalize ${DDE_DLL_FILE}] dde]; \
+	package ifneeded dde 1.4.0b2 [list load [file normalize ${DDE_DLL_FILE}] dde]; \
 	package ifneeded registry 1.3.0 [list load [file normalize ${REG_DLL_FILE}] registry]" $(SCRIPT)
 
 # This target can be used to run tclsh from the build directory via
@@ -744,7 +742,7 @@ PKG_CFG_ARGS		= @PKG_CFG_ARGS@
 PKG_DIR			= ./pkgs
 
 packages:
-	@builddir=`pwd`; \
+	@builddir=`pwd -P`; \
 	for i in $(PKGS_DIR)/*; do \
 	  if [ -d $$i ] ; then \
 	    if [ -x $$i/configure ] ; then \
@@ -752,7 +750,7 @@ packages:
 	      mkdir -p $(PKG_DIR)/$$pkg; \
 	      if [ ! -f $(PKG_DIR)/$$pkg/Makefile ]; then \
 	        ( cd $(PKG_DIR)/$$pkg; \
-	          echo "Configuring package '$$i' wd = `pwd`"; \
+	          echo "Configuring package '$$i' wd = `pwd -P`"; \
 	          $$i/configure --with-tcl=$(PWD) --with-tclinclude=$(GENERIC_DIR) $(PKG_CFG_ARGS) --enable-shared --enable-threads; ) \
 	      fi ; \
 	      echo "Building package '$$pkg'"; \
@@ -763,7 +761,7 @@ packages:
 	cd $$builddir
 
 install-packages: packages
-	@builddir=`pwd`; \
+	@builddir=`pwd -P`; \
 	for i in $(PKGS_DIR)/*; do \
 	  if [ -d $$i ]; then \
 	    pkg=`basename $$i`; \
@@ -776,20 +774,20 @@ install-packages: packages
 	cd $$builddir
 
 test-packages: tcltest packages
-	@builddir=`pwd`; \
+	@builddir=`pwd -P`; \
 	for i in $(PKGS_DIR)/*; do \
 	  if [ -d $$i ]; then \
 	    pkg=`basename $$i`; \
 	    if [ -f $(PKG_DIR)/$$pkg/Makefile ]; then \
 	        echo "Testing package '$$pkg'"; \
-	        ( cd $(PKG_DIR)/$$pkg; $(MAKE) "LD_LIBRARY_PATH=$$builddir:${LD_LIBRARY_PATH}" "TCL_LIBRARY=${TCL_BUILDTIME_LIBRARY}" "TCLLIBPATH=$$builddir/pkgs" test "TCLSH_PROG=$$builddir/tcltest"; ) \
+	        ( cd $(PKG_DIR)/$$pkg; $(MAKE) "LD_LIBRARY_PATH=$$builddir:${LD_LIBRARY_PATH}" "TCL_LIBRARY=${TCL_BUILDTIME_LIBRARY}" "TCLLIBPATH=$$builddir/pkgs" test "TCLSH_PROG=$$builddir/${TCLSH}"; ) \
 	    fi; \
 	  fi; \
 	done; \
 	cd $$builddir
 
 clean-packages:
-	@builddir=`pwd`; \
+	@builddir=`pwd -P`; \
 	for i in $(PKGS_DIR)/*; do \
 	  if [ -d $$i ]; then \
 	    pkg=`basename $$i`; \
@@ -801,7 +799,7 @@ clean-packages:
 	cd $$builddir
 
 distclean-packages:
-	@builddir=`pwd`; \
+	@builddir=`pwd -P`; \
 	for i in $(PKGS_DIR)/*; do \
 	  if [ -d $$i ]; then \
 	    pkg=`basename $$i`; \
diff --git a/win/buildall.vc.bat b/win/buildall.vc.bat
index c33aefd..e4f0a30 100755
--- a/win/buildall.vc.bat
+++ b/win/buildall.vc.bat
@@ -1,4 +1,5 @@
 @echo off
+
 ::  This is an example batchfile for building everything. Please
 ::  edit this (or make your own) for your needs and wants using
 ::  the instructions for calling makefile.vc found in makefile.vc
@@ -26,10 +27,11 @@ cd > nul
 :: path or have already run vcvars32.bat.  Testing these envars proves
 :: cl.exe and friends are in your path.
 ::
-if defined VCINSTALLDIR (goto :startBuilding)
-if defined MSDRVDIR     (goto :startBuilding)
-if defined MSVCDIR      (goto :startBuilding)
-if defined MSSDK        (goto :startBuilding)
+if defined VCINSTALLDIR  (goto :startBuilding)
+if defined MSDEVDIR      (goto :startBuilding)
+if defined MSVCDIR       (goto :startBuilding)
+if defined MSSDK         (goto :startBuilding)
+if defined WINDOWSSDKDIR (goto :startBuilding)
 
 :: We need to run the development environment batch script that comes
 :: with developer studio (v4,5,6,7,etc...)  All have it.  This path
@@ -62,42 +64,13 @@ if not %SYMBOLS%.==. set OPTS=symbols
 nmake -nologo -f makefile.vc release htmlhelp OPTS=%OPTS% %1
 if errorlevel 1 goto error
 
-:: Build the static core, dlls and shell.
-::
-set OPTS=static
-if not %SYMBOLS%.==. set OPTS=symbols,static
-nmake -nologo -f makefile.vc release OPTS=%OPTS% %1
-if errorlevel 1 goto error
-
-:: Build the special static libraries that use the dynamic runtime.
+:: Build the static core and shell.
 ::
 set OPTS=static,msvcrt
 if not %SYMBOLS%.==. set OPTS=symbols,static,msvcrt
-nmake -nologo -f makefile.vc core dlls OPTS=%OPTS% %1
-if errorlevel 1 goto error
-
-:: Build the core and shell for thread support.
-::
-set OPTS=threads
-if not %SYMBOLS%.==. set OPTS=symbols,threads
 nmake -nologo -f makefile.vc shell OPTS=%OPTS% %1
 if errorlevel 1 goto error
 
-:: Build a static, thread support core library with a shell.
-::
-set OPTS=static,threads
-if not %SYMBOLS%.==. set OPTS=symbols,static,threads
-nmake -nologo -f makefile.vc shell OPTS=%OPTS% %1
-if errorlevel 1 goto error
-
-:: Build the special static libraries that use the dynamic runtime,
-:: but now with thread support.
-::
-set OPTS=static,msvcrt,threads
-if not %SYMBOLS%.==. set OPTS=symbols,static,msvcrt,threads
-nmake -nologo -f makefile.vc core dlls OPTS=%OPTS% %1
-if errorlevel 1 goto error
-
 set OPTS=
 set SYMBOLS=
 goto end
diff --git a/win/configure b/win/configure
index f5a23fe..0258898 100755
--- a/win/configure
+++ b/win/configure
@@ -1311,7 +1311,7 @@ SHELL=/bin/sh
 TCL_VERSION=8.6
 TCL_MAJOR_VERSION=8
 TCL_MINOR_VERSION=6
-TCL_PATCH_LEVEL="b2"
+TCL_PATCH_LEVEL="b3"
 VER=$TCL_MAJOR_VERSION$TCL_MINOR_VERSION
 
 TCL_DDE_VERSION=1.4
@@ -4344,12 +4344,6 @@ esac
 #	as we just assume that the platform hasn't got a usable z.lib
 #------------------------------------------------------------------------
 
-if test "$do64bit" = "yes"; then
-
-  tcl_ok=no
-
-else
-
 if test "${enable_shared+set}" = "set"; then
 
   enableval="$enable_shared"
@@ -4361,14 +4355,21 @@ else
 
 fi
 
-
-fi
-
 if test "$tcl_ok" = "yes"; then
 
   ZLIB_DLL_FILE=\${ZLIB_DLL_FILE}
 
-  ZLIB_LIBS=\${ZLIB_DIR}/win32/zdll.lib
+  if test "$do64bit" = "yes"; then
+
+    ZLIB_LIBS=\${ZLIB_DIR}/win64/zdll.lib
+
+
+else
+
+    ZLIB_LIBS=\${ZLIB_DIR}/win32/zdll.lib
+
+
+fi
 
 
 else
diff --git a/win/configure.in b/win/configure.in
index d17f815..0426bb1 100644
--- a/win/configure.in
+++ b/win/configure.in
@@ -14,7 +14,7 @@ SHELL=/bin/sh
 TCL_VERSION=8.6
 TCL_MAJOR_VERSION=8
 TCL_MINOR_VERSION=6
-TCL_PATCH_LEVEL="b2"
+TCL_PATCH_LEVEL="b3"
 VER=$TCL_MAJOR_VERSION$TCL_MINOR_VERSION
 
 TCL_DDE_VERSION=1.4
@@ -120,19 +120,19 @@ esac
 #	as we just assume that the platform hasn't got a usable z.lib
 #------------------------------------------------------------------------
 
-AS_IF([test "$do64bit" = "yes"], [
-  tcl_ok=no
-], [
 AS_IF([test "${enable_shared+set}" = "set"], [
   enableval="$enable_shared"
   tcl_ok=$enableval
 ], [
   tcl_ok=yes
 ])
-])
 AS_IF([test "$tcl_ok" = "yes"], [
   AC_SUBST(ZLIB_DLL_FILE,[\${ZLIB_DLL_FILE}])
-  AC_SUBST(ZLIB_LIBS,[\${ZLIB_DIR}/win32/zdll.lib])
+  AS_IF([test "$do64bit" = "yes"], [
+    AC_SUBST(ZLIB_LIBS,[\${ZLIB_DIR}/win64/zdll.lib])
+  ], [
+    AC_SUBST(ZLIB_LIBS,[\${ZLIB_DIR}/win32/zdll.lib])
+  ])
 ], [
   AC_SUBST(ZLIB_OBJS,[\${ZLIB_OBJS}])
   AC_DEFINE_UNQUOTED(NO_VIZ, 1)
diff --git a/win/makefile.vc b/win/makefile.vc
index ba5b710..d097e26 100644
--- a/win/makefile.vc
+++ b/win/makefile.vc
@@ -578,13 +578,13 @@ test-core: setup $(TCLTEST) dlls $(CAT32)
 	set TCL_LIBRARY=$(ROOT:\=/)/library
 !if "$(OS)" == "Windows_NT"  || "$(MSVCDIR)" == "IDE"
 	$(DEBUGGER) $(TCLTEST) "$(ROOT:\=/)/tests/all.tcl" $(TESTFLAGS) -loadfile <<
-		package ifneeded dde 1.4.0b1 [list load "$(TCLDDELIB:\=/)" dde]
+		package ifneeded dde 1.4.0b2 [list load "$(TCLDDELIB:\=/)" dde]
 		package ifneeded registry 1.3.0 [list load "$(TCLREGLIB:\=/)" registry]
 <<
 !else
 	@echo Please wait while the tests are collected...
 	$(TCLTEST) "$(ROOT:\=/)/tests/all.tcl" $(TESTFLAGS) -loadfile << > tests.log
-		package ifneeded dde 1.4.0b1 "$(TCLDDELIB:\=/)" dde]
+		package ifneeded dde 1.4.0b2 "$(TCLDDELIB:\=/)" dde]
 		package ifneeded registry 1.3.0 "$(TCLREGLIB:\=/)" registry]
 <<
 	type tests.log | more
diff --git a/win/nmakehlp.c b/win/nmakehlp.c
index 2868857..b1a1517 100644
--- a/win/nmakehlp.c
+++ b/win/nmakehlp.c
@@ -47,7 +47,7 @@ static int CheckForLinkerFeature(const char *option);
 static int IsIn(const char *string, const char *substring);
 static int SubstituteFile(const char *substs, const char *filename);
 static int QualifyPath(const char *path);
-static const char *GetVersionFromFile(const char *filename, const char *match);
+static const char *GetVersionFromFile(const char *filename, const char *match, int numdots);
 static DWORD WINAPI ReadFromPipe(LPVOID args);
 
 /* globals */
@@ -153,7 +153,7 @@ main(
 		    &dwWritten, NULL);
 		return 0;
 	    }
-	    printf("%s\n", GetVersionFromFile(argv[2], argv[3]));
+	    printf("%s\n", GetVersionFromFile(argv[2], argv[3], *(argv[1]+2) - '0'));
 	    return 0;
 	case 'Q':
 	    if (argc != 3) {
@@ -479,7 +479,8 @@ IsIn(
 static const char *
 GetVersionFromFile(
     const char *filename,
-    const char *match)
+    const char *match,
+    int numdots)
 {
     size_t cbBuffer = 100;
     static char szBuffer[100];
@@ -497,9 +498,10 @@ GetVersionFromFile(
 	    p = strstr(szBuffer, match);
 	    if (p != NULL) {
 		/*
-		 * Skip to first digit.
+		 * Skip to first digit after the match.
 		 */
 
+		p += strlen(match);
 		while (*p && !isdigit(*p)) {
 		    ++p;
 		}
@@ -509,7 +511,8 @@ GetVersionFromFile(
 		 */
 
 		q = p;
-		while (*q && (isalnum(*q) || *q == '.')) {
+		while (*q && (strchr("0123456789.ab", *q)) && ((!strchr(".ab", *q)
+			    && (!strchr("ab", q[-1])) || --numdots))) {
 		    ++q;
 		}
 
@@ -628,11 +631,11 @@ SubstituteFile(
 	    }
 	}
 #endif
-	
+
 	/*
 	 * Run the substitutions over each line of the input
 	 */
-	
+
 	while (fgets(szBuffer, cbBuffer, fp) != NULL) {
 	    list_item_t *p = NULL;
 	    for (p = substPtr; p != NULL; p = p->nextPtr) {
@@ -652,7 +655,7 @@ SubstituteFile(
 	    }
 	    printf(szBuffer);
 	}
-	
+
 	list_free(&substPtr);
     }
     fclose(fp);
diff --git a/win/rules.vc b/win/rules.vc
index f09e2ea..1513198 100644
--- a/win/rules.vc
+++ b/win/rules.vc
@@ -218,7 +218,7 @@ DEBUG		= 0
 SYMBOLS		= 0
 PROFILE		= 0
 PGO		= 0
-MSVCRT		= 0
+MSVCRT		= 1
 LOIMPACT	= 0
 TCL_USE_STATIC_PACKAGES	= 0
 USE_THREAD_ALLOC = 1
@@ -234,9 +234,13 @@ STATIC_BUILD	= 0
 !message *** Doing msvcrt
 MSVCRT		= 1
 !else
+!if !$(STATIC_BUILD)
+MSVCRT		= 1
+!else
 MSVCRT		= 0
 !endif
-!if [nmakehlp -f $(OPTS) "staticpkg"]
+!endif
+!if [nmakehlp -f $(OPTS) "staticpkg"] && $(STATIC_BUILD)
 !message *** Doing staticpkg
 TCL_USE_STATIC_PACKAGES	= 1
 !else
@@ -245,6 +249,7 @@ TCL_USE_STATIC_PACKAGES	= 0
 !if [nmakehlp -f $(OPTS) "nothreads"]
 !message *** Compile explicitly for non-threaded tcl
 TCL_THREADS	= 0
+USE_THREAD_ALLOC= 0
 !else
 TCL_THREADS	= 1
 USE_THREAD_ALLOC= 1
@@ -298,15 +303,6 @@ UNCHECKED = 0
 !endif
 !endif
 
-
-!if !$(STATIC_BUILD)
-# Make sure we don't build overly fat DLLs.
-MSVCRT		= 1
-# We shouldn't statically put the extensions inside the shell when dynamic.
-TCL_USE_STATIC_PACKAGES = 0
-!endif
-
-
 #----------------------------------------------------------
 # Figure-out how to name our intermediate and output directories.
 # We wouldn't want different builds to use the same .obj files
@@ -348,10 +344,8 @@ TMP_DIRFULL = .\$(BUILDDIRTOP)\$(PROJECT)_ThreadedDynamicStaticX
 TMP_DIRFULL = $(TMP_DIRFULL:Static=)
 SUFX	    = $(SUFX:s=)
 EXT	    = dll
-!if $(MSVCRT)
 TMP_DIRFULL = $(TMP_DIRFULL:X=)
 SUFX	    = $(SUFX:x=)
-!endif
 !else
 TMP_DIRFULL = $(TMP_DIRFULL:Dynamic=)
 EXT	    = lib
@@ -583,12 +577,6 @@ Failed to find tcl.h.  The TCLDIR macro does not appear correct.
 
 TCL_VERSION	= $(TCL_MAJOR_VERSION)$(TCL_MINOR_VERSION)
 
-!if $(TCL_VERSION) < 81
-TCL_DOES_STUBS	= 0
-!else
-TCL_DOES_STUBS	= 1
-!endif
-
 !if $(TCLINSTALL)
 TCLSH		= "$(_TCLDIR)\bin\tclsh$(TCL_VERSION)$(SUFX).exe"
 !if !exist($(TCLSH)) && $(TCL_THREADS)
diff --git a/win/tclAppInit.c b/win/tclAppInit.c
index d6da500..56f45a0 100644
--- a/win/tclAppInit.c
+++ b/win/tclAppInit.c
@@ -109,9 +109,9 @@ _tmain(
      * Forward slashes substituted for backslashes.
      */
 
-    for (p = argv[0]; *p != TEXT('\0'); p++) {
-	if (*p == TEXT('\\')) {
-	    *p = TEXT('/');
+    for (p = argv[0]; *p != '\0'; p++) {
+	if (*p == '\\') {
+	    *p = '/';
 	}
     }
 
@@ -242,13 +242,13 @@ setargv(
      */
 
     size = 2;
-    for (p = cmdLine; *p != TEXT('\0'); p++) {
-	if ((*p == TEXT(' ')) || (*p == TEXT('\t'))) {	/* INTL: ISO space. */
+    for (p = cmdLine; *p != '\0'; p++) {
+	if ((*p == ' ') || (*p == '\t')) {	/* INTL: ISO space. */
 	    size++;
-	    while ((*p == TEXT(' ')) || (*p == TEXT('\t'))) { /* INTL: ISO space. */
+	    while ((*p == ' ') || (*p == '\t')) { /* INTL: ISO space. */
 		p++;
 	    }
-	    if (*p == TEXT('\0')) {
+	    if (*p == '\0') {
 		break;
 	    }
 	}
@@ -267,10 +267,10 @@ setargv(
     p = cmdLine;
     for (argc = 0; argc < size; argc++) {
 	argv[argc] = arg = argSpace;
-	while ((*p == TEXT(' ')) || (*p == TEXT('\t'))) {	/* INTL: ISO space. */
+	while ((*p == ' ') || (*p == '\t')) {	/* INTL: ISO space. */
 	    p++;
 	}
-	if (*p == TEXT('\0')) {
+	if (*p == '\0') {
 	    break;
 	}
 
@@ -278,14 +278,14 @@ setargv(
 	slashes = 0;
 	while (1) {
 	    copy = 1;
-	    while (*p == TEXT('\\')) {
+	    while (*p == '\\') {
 		slashes++;
 		p++;
 	    }
-	    if (*p == TEXT('"')) {
+	    if (*p == '"') {
 		if ((slashes & 1) == 0) {
 		    copy = 0;
-		    if ((inquote) && (p[1] == TEXT('"'))) {
+		    if ((inquote) && (p[1] == '"')) {
 			p++;
 			copy = 1;
 		    } else {
@@ -296,13 +296,13 @@ setargv(
 	    }
 
 	    while (slashes) {
-		*arg = TEXT('\\');
+		*arg = '\\';
 		arg++;
 		slashes--;
 	    }
 
-	    if ((*p == TEXT('\0')) || (!inquote &&
-		    ((*p == TEXT(' ')) || (*p == TEXT('\t'))))) {	/* INTL: ISO space. */
+	    if ((*p == '\0') || (!inquote &&
+		    ((*p == ' ') || (*p == '\t')))) {	/* INTL: ISO space. */
 		break;
 	    }
 	    if (copy != 0) {
diff --git a/win/tclWinChan.c b/win/tclWinChan.c
index 517aa20..52b9e32 100644
--- a/win/tclWinChan.c
+++ b/win/tclWinChan.c
@@ -940,8 +940,9 @@ TclpOpenFileChannel(
 	}
 	TclWinConvertError(err);
 	if (interp != (Tcl_Interp *) NULL) {
-	    Tcl_AppendResult(interp, "couldn't open \"", TclGetString(pathPtr),
-		    "\": ", Tcl_PosixError(interp), NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "couldn't open \"%s\": %s",
+		    TclGetString(pathPtr), Tcl_PosixError(interp)));
 	}
 	return NULL;
     }
@@ -959,9 +960,9 @@ TclpOpenFileChannel(
 	if (handle == INVALID_HANDLE_VALUE) {
 	    TclWinConvertError(GetLastError());
 	    if (interp != (Tcl_Interp *) NULL) {
-		Tcl_AppendResult(interp, "couldn't reopen serial \"",
-			TclGetString(pathPtr), "\": ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"couldn't reopen serial \"%s\": %s",
+			TclGetString(pathPtr), Tcl_PosixError(interp)));
 	    }
 	    return NULL;
 	}
@@ -995,8 +996,9 @@ TclpOpenFileChannel(
 	 */
 
 	channel = NULL;
-	Tcl_AppendResult(interp, "couldn't open \"", TclGetString(pathPtr),
-		"\": bad file type", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't open \"%s\": bad file type",
+		TclGetString(pathPtr)));
 	Tcl_SetErrorCode(interp, "TCL", "VALUE", "CHANNEL", "BAD_TYPE",
 		NULL);
 	break;
diff --git a/win/tclWinDde.c b/win/tclWinDde.c
index 4d6e31b..f5c0484 100644
--- a/win/tclWinDde.c
+++ b/win/tclWinDde.c
@@ -26,6 +26,12 @@
 #   define Tcl_WinUtfToTChar(a,b,c) Tcl_UtfToExternalDString(NULL,a,b,c)
 #endif
 
+#if !defined(NDEBUG)
+    /* test POKE server Implemented for debug mode only */
+#   undef CBF_FAIL_POKES
+#   define CBF_FAIL_POKES 0
+#endif
+
 /*
  * TCL_STORAGE_CLASS is set unconditionally to DLLEXPORT because the Dde_Init
  * declaration is in the source file itself, which is only accessed when we
@@ -90,7 +96,7 @@ static DWORD ddeInstance;	/* The application instance handle given to us
 				 * by DdeInitialize. */
 static int ddeIsServer = 0;
 
-#define TCL_DDE_VERSION		"1.4.0b1"
+#define TCL_DDE_VERSION		"1.4.0b2"
 #define TCL_DDE_PACKAGE_NAME	"dde"
 #define TCL_DDE_SERVICE_NAME	TEXT("TclEval")
 #define TCL_DDE_EXECUTE_RESULT	TEXT("$TCLEVAL$EXECUTE$RESULT")
@@ -157,7 +163,8 @@ Dde_Init(
 
 #ifdef UNICODE
     if (TclWinGetPlatformId() < VER_PLATFORM_WIN32_NT) {
-	Tcl_AppendResult(interp, "Win32s and Windows 9x are not supported platforms", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"Win32s and Windows 9x are not supported platforms", -1));
 	return TCL_ERROR;
     }
 #endif
@@ -749,7 +756,7 @@ DdeServerProc(
 		} else {
 		    returnString = (char *)
 			    Tcl_GetUnicodeFromObj(convPtr->returnPackagePtr, &len);
-		    len = 2 * len + 1;
+		    len = sizeof(TCHAR) * len + 1;
 		}
 		ddeReturn = DdeCreateDataHandle(ddeInstance, (BYTE *)returnString,
 			(DWORD) len+1, 0, ddeItem, uFmt, 0);
@@ -770,7 +777,7 @@ DdeServerProc(
 			} else {
 			    returnString = (char *) Tcl_GetUnicodeFromObj(
 				    variableObjPtr, &len);
-			    len = 2 * len + 1;
+			    len = sizeof(TCHAR) * len + 1;
 			}
 			ddeReturn = DdeCreateDataHandle(ddeInstance,
 				(BYTE *)returnString, (DWORD) len+1, 0, ddeItem,
@@ -785,6 +792,53 @@ DdeServerProc(
 	}
 	return ddeReturn;
 
+#if !CBF_FAIL_POKES
+    case XTYP_POKE:
+	/*
+	 * This is a poke for a Tcl variable, only implemented in
+	 * debug/UNICODE mode.
+	 */
+	ddeReturn = DDE_FNOTPROCESSED;
+
+	if ((uFmt != CF_TEXT) && (uFmt != CF_UNICODETEXT)) {
+	    return ddeReturn;
+	}
+
+	for (convPtr = tsdPtr->currentConversations; (convPtr != NULL)
+		&& (convPtr->hConv != hConv); convPtr = convPtr->nextPtr) {
+	    /*
+	     * Empty loop body.
+	     */
+	}
+
+	if (convPtr && !Tcl_IsSafe(convPtr->riPtr->interp)) {
+	    Tcl_DString ds;
+	    Tcl_Obj *variableObjPtr;
+
+	    len = DdeQueryString(ddeInstance, ddeItem, NULL, 0, CP_WINUNICODE);
+	    Tcl_DStringInit(&dString);
+	    Tcl_DStringSetLength(&dString, (len + 1) * sizeof(TCHAR) - 1);
+	    utilString = (TCHAR *) Tcl_DStringValue(&dString);
+	    DdeQueryString(ddeInstance, ddeItem, utilString, (DWORD) len + 1,
+		    CP_WINUNICODE);
+	    Tcl_WinTCharToUtf(utilString, -1, &ds);
+	    utilString = (TCHAR *) DdeAccessData(hData, &dlen);
+	    if (uFmt == CF_TEXT) {
+		variableObjPtr = Tcl_NewStringObj((char *)utilString, -1);
+	    } else {
+		variableObjPtr = Tcl_NewUnicodeObj(utilString, -1);
+	    }
+
+	    Tcl_SetVar2Ex(convPtr->riPtr->interp, Tcl_DStringValue(&ds), NULL,
+		    variableObjPtr, TCL_GLOBAL_ONLY);
+
+	    Tcl_DStringFree(&ds);
+	    Tcl_DStringFree(&dString);
+		ddeReturn = (HDDEDATA) DDE_FACK;
+	}
+	return ddeReturn;
+
+#endif
     case XTYP_EXECUTE: {
 	/*
 	 * Execute this script. The results will be saved into a list object
@@ -947,8 +1001,12 @@ MakeDdeConnection(
 
     if (ddeConv == (HCONV) NULL) {
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "no registered server named \"",
-		    name, "\"", NULL);
+	    Tcl_DString dString;
+
+	    Tcl_WinTCharToUtf(name, -1, &dString);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "no registered server named \"%s\"", Tcl_DStringValue(&dString)));
+	    Tcl_DStringFree(&dString);
 	    Tcl_SetErrorCode(interp, "TCL", "DDE", "NO_SERVER", NULL);
 	}
 	return TCL_ERROR;
@@ -1424,7 +1482,11 @@ DdeObjCmd(
 	serviceName = DdeSetServerName(interp, serviceName, flags,
 		handlerPtr);
 	if (serviceName != NULL) {
+#ifdef UNICODE
 	    Tcl_SetObjResult(interp, Tcl_NewUnicodeObj((Tcl_UniChar *) serviceName, -1));
+#else
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(serviceName, -1));
+#endif
 	} else {
 	    Tcl_ResetResult(interp);
 	}
@@ -1432,15 +1494,15 @@ DdeObjCmd(
 
     case DDE_EXECUTE: {
 	int dataLength;
-	const char *dataString;
+	const Tcl_UniChar *dataString;
 
 	if (flags & DDE_FLAG_BINARY) {
-	    dataString = (const char *)
+	    dataString = (const Tcl_UniChar *)
 		    Tcl_GetByteArrayFromObj(objv[firstArg + 2], &dataLength);
 	} else {
 	    dataString =
-		    Tcl_GetStringFromObj(objv[firstArg + 2], &dataLength);
-	    dataLength += 1;
+		    Tcl_GetUnicodeFromObj(objv[firstArg + 2], &dataLength);
+	    dataLength = (dataLength + 1) * sizeof(Tcl_UniChar);
 	}
 
 	if (dataLength <= 0) {
@@ -1461,15 +1523,15 @@ DdeObjCmd(
 	}
 
 	ddeData = DdeCreateDataHandle(ddeInstance, (BYTE *) dataString,
-		(DWORD) dataLength, 0, 0, CF_TEXT, 0);
+		(DWORD) dataLength, 0, 0, (flags & DDE_FLAG_BINARY) ? CF_TEXT : CF_UNICODETEXT, 0);
 	if (ddeData != NULL) {
 	    if (flags & DDE_FLAG_ASYNC) {
 		DdeClientTransaction((LPBYTE) ddeData, 0xFFFFFFFF, hConv, 0,
-			CF_TEXT, XTYP_EXECUTE, TIMEOUT_ASYNC, &ddeResult);
+			(flags & DDE_FLAG_BINARY) ? CF_TEXT : CF_UNICODETEXT, XTYP_EXECUTE, TIMEOUT_ASYNC, &ddeResult);
 		DdeAbandonTransaction(ddeInstance, hConv, ddeResult);
 	    } else {
 		ddeReturn = DdeClientTransaction((LPBYTE) ddeData, 0xFFFFFFFF,
-			hConv, 0, CF_TEXT, XTYP_EXECUTE, 30000, NULL);
+			hConv, 0, (flags & DDE_FLAG_BINARY) ? CF_TEXT : CF_UNICODETEXT, XTYP_EXECUTE, 30000, NULL);
 		if (ddeReturn == 0) {
 		    SetDdeError(interp);
 		    result = TCL_ERROR;
@@ -1511,22 +1573,23 @@ DdeObjCmd(
 		    CP_WINUNICODE);
 	    if (ddeItem != NULL) {
 		ddeData = DdeClientTransaction(NULL, 0, hConv, ddeItem,
-			CF_TEXT, XTYP_REQUEST, 5000, NULL);
+			(flags & DDE_FLAG_BINARY) ? CF_TEXT : CF_UNICODETEXT, XTYP_REQUEST, 5000, NULL);
 		if (ddeData == NULL) {
 		    SetDdeError(interp);
 		    result = TCL_ERROR;
 		} else {
 		    DWORD tmp;
-		    const char *dataString = (const char *) DdeAccessData(ddeData, &tmp);
+		    const Tcl_UniChar *dataString = (const Tcl_UniChar *) DdeAccessData(ddeData, &tmp);
 
 		    if (flags & DDE_FLAG_BINARY) {
 			returnObjPtr =
 				Tcl_NewByteArrayObj((BYTE *) dataString, (int) tmp);
 		    } else {
-			if (tmp && !dataString[tmp-1]) {
+			tmp >>= 1;
+			if (tmp && !dataString[(tmp-1)]) {
 			    --tmp;
 			}
-			returnObjPtr = Tcl_NewStringObj(dataString,
+			returnObjPtr = Tcl_NewUnicodeObj(dataString,
 				(int) tmp);
 		    }
 		    DdeUnaccessData(ddeData);
@@ -1563,8 +1626,8 @@ DdeObjCmd(
 		    Tcl_GetByteArrayFromObj(objv[firstArg + 3], &length);
 	} else {
 	    dataString = (BYTE *)
-		    Tcl_GetStringFromObj(objv[firstArg + 3], &length);
-	    length += 1;
+		    Tcl_GetUnicodeFromObj(objv[firstArg + 3], &length);
+	    length = 2 * length + 1;
 	}
 
 	hConv = DdeConnect(ddeInstance, ddeService, ddeTopic, NULL);
@@ -1579,7 +1642,7 @@ DdeObjCmd(
 		    CP_WINUNICODE);
 	    if (ddeItem != NULL) {
 		ddeData = DdeClientTransaction(dataString, (DWORD) length,
-			hConv, ddeItem, CF_TEXT, XTYP_POKE, 5000, NULL);
+			hConv, ddeItem, (flags & DDE_FLAG_BINARY) ? CF_TEXT : CF_UNICODETEXT, XTYP_POKE, 5000, NULL);
 		if (ddeData == NULL) {
 		    SetDdeError(interp);
 		    result = TCL_ERROR;
@@ -1722,24 +1785,24 @@ DdeObjCmd(
 	    }
 
 	    objPtr = Tcl_ConcatObj(objc, objv);
-	    string = Tcl_GetStringFromObj(objPtr, &length);
+	    string = (const char *) Tcl_GetUnicodeFromObj(objPtr, &length);
 	    ddeItemData = DdeCreateDataHandle(ddeInstance,
-		    (BYTE *) string, (DWORD) length+1, 0, 0, CF_TEXT, 0);
+		    (BYTE *) string, (DWORD) 2*length+2, 0, 0, CF_UNICODETEXT, 0);
 
 	    if (flags & DDE_FLAG_ASYNC) {
 		ddeData = DdeClientTransaction((LPBYTE) ddeItemData,
 			0xFFFFFFFF, hConv, 0,
-			CF_TEXT, XTYP_EXECUTE, TIMEOUT_ASYNC, &ddeResult);
+			CF_UNICODETEXT, XTYP_EXECUTE, TIMEOUT_ASYNC, &ddeResult);
 		DdeAbandonTransaction(ddeInstance, hConv, ddeResult);
 	    } else {
 		ddeData = DdeClientTransaction((LPBYTE) ddeItemData,
 			0xFFFFFFFF, hConv, 0,
-			CF_TEXT, XTYP_EXECUTE, 30000, NULL);
+			CF_UNICODETEXT, XTYP_EXECUTE, 30000, NULL);
 		if (ddeData != 0) {
 		    ddeCookie = DdeCreateStringHandle(ddeInstance,
 			    TCL_DDE_EXECUTE_RESULT, CP_WINUNICODE);
 		    ddeData = DdeClientTransaction(NULL, 0, hConv, ddeCookie,
-			    CF_TEXT, XTYP_REQUEST, 30000, NULL);
+			    CF_UNICODETEXT, XTYP_REQUEST, 30000, NULL);
 		}
 	    }
 
@@ -1753,6 +1816,7 @@ DdeObjCmd(
 
 	    if (!(flags & DDE_FLAG_ASYNC)) {
 		Tcl_Obj *resultPtr;
+		Tcl_UniChar *ddeDataString;
 
 		/*
 		 * The return handle has a two or four element list in it. The
@@ -1765,10 +1829,11 @@ DdeObjCmd(
 
 		resultPtr = Tcl_NewObj();
 		length = DdeGetData(ddeData, NULL, 0, 0);
-		Tcl_SetObjLength(resultPtr, (length + 1) * sizeof(TCHAR) - 1);
-		string = Tcl_GetString(resultPtr);
-		DdeGetData(ddeData, (BYTE *) string, (DWORD) length, 0);
-		Tcl_SetObjLength(resultPtr, (int) strlen(string));
+		ddeDataString = ckalloc(length);
+		DdeGetData(ddeData, (BYTE *) ddeDataString, (DWORD) length, 0);
+		length = (length >> 1) - 1;
+		resultPtr = Tcl_NewUnicodeObj(ddeDataString, length);
+		ckfree(ddeDataString);
 
 		if (Tcl_ListObjIndex(NULL, resultPtr, 0, &objPtr) != TCL_OK) {
 		    Tcl_DecrRefCount(resultPtr);
diff --git a/win/tclWinFCmd.c b/win/tclWinFCmd.c
index 77a5b82..ac88861 100644
--- a/win/tclWinFCmd.c
+++ b/win/tclWinFCmd.c
@@ -1530,8 +1530,8 @@ StatError(
 				 * error. */
 {
     TclWinConvertError(GetLastError());
-    Tcl_AppendResult(interp, "could not read \"", TclGetString(fileName),
-	    "\": ", Tcl_PosixError(interp), (char *) NULL);
+    Tcl_SetObjResult(interp, Tcl_ObjPrintf("could not read \"%s\": %s",
+	    TclGetString(fileName), Tcl_PosixError(interp)));
 }
 
 /*
@@ -1649,9 +1649,9 @@ ConvertFileNameFormat(
 
     if (splitPath == NULL || pathc == 0) {
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "could not read \"",
-		    Tcl_GetString(fileName), "\": no such file or directory",
-		    (char *) NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "could not read \"%s\": no such file or directory",
+		    Tcl_GetString(fileName)));
 	    errno = ENOENT;
 	    Tcl_PosixError(interp);
 	}
@@ -1738,11 +1738,11 @@ ConvertFileNameFormat(
 	    }
 	    nativeName = data.cAlternateFileName;
 	    if (longShort) {
-		if (data.cFileName[0] != TEXT('\0')) {
+		if (data.cFileName[0] != '\0') {
 		    nativeName = data.cFileName;
 		}
 	    } else {
-		if (data.cAlternateFileName[0] == TEXT('\0')) {
+		if (data.cAlternateFileName[0] == '\0') {
 		    nativeName = (TCHAR *) data.cFileName;
 		}
 	    }
@@ -1941,9 +1941,9 @@ CannotSetAttribute(
     Tcl_Obj *fileName,		/* The name of the file. */
     Tcl_Obj *attributePtr)	/* The new value of the attribute. */
 {
-    Tcl_AppendResult(interp, "cannot set attribute \"",
-	    tclpFileAttrStrings[objIndex], "\" for file \"",
-	    Tcl_GetString(fileName), "\": attribute is readonly", NULL);
+    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+	    "cannot set attribute \"%s\" for file \"%s\": attribute is readonly",
+	    tclpFileAttrStrings[objIndex], Tcl_GetString(fileName)));
     errno = EINVAL;
     Tcl_PosixError(interp);
     return TCL_ERROR;
diff --git a/win/tclWinFile.c b/win/tclWinFile.c
index 1f56060..a1189f5 100644
--- a/win/tclWinFile.c
+++ b/win/tclWinFile.c
@@ -1048,10 +1048,9 @@ TclpMatchInDirectory(
 
 	    TclWinConvertError(err);
 	    if (interp != NULL) {
-		Tcl_ResetResult(interp);
-		Tcl_AppendResult(interp, "couldn't read directory \"",
-			Tcl_DStringValue(&dsOrig), "\": ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"couldn't read directory \"%s\": %s",
+			Tcl_DStringValue(&dsOrig), Tcl_PosixError(interp)));
 	    }
 	    Tcl_DStringFree(&dsOrig);
 	    return TCL_ERROR;
@@ -1785,7 +1784,7 @@ NativeIsExec(
 	return 0;
     }
 
-    if (path[len-4] != TEXT('.')) {
+    if (path[len-4] != '.') {
 	return 0;
     }
 
@@ -1866,8 +1865,9 @@ TclpGetCwd(
     if (GetCurrentDirectory(MAX_PATH, buffer) == 0) {
 	TclWinConvertError(GetLastError());
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "error getting working directory name: ",
-		    Tcl_PosixError(interp), NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "error getting working directory name: %s",
+		    Tcl_PosixError(interp)));
 	}
 	return NULL;
     }
diff --git a/win/tclWinLoad.c b/win/tclWinLoad.c
index b59ccba..6294086 100644
--- a/win/tclWinLoad.c
+++ b/win/tclWinLoad.c
@@ -91,9 +91,8 @@ TclpDlopen(
 
     if (hInstance == NULL) {
 	DWORD lastError = GetLastError();
-
-	Tcl_AppendResult(interp, "couldn't load library \"",
-		Tcl_GetString(pathPtr), "\": ", NULL);
+	Tcl_Obj *errMsg = Tcl_ObjPrintf("couldn't load library \"%s\": ",
+		Tcl_GetString(pathPtr));
 
 	/*
 	 * Check for possible DLL errors. This doesn't work quite right,
@@ -109,29 +108,30 @@ TclpDlopen(
 	case ERROR_DLL_NOT_FOUND:
 	    Tcl_SetErrorCode(interp, "WIN_LOAD", "DLL_NOT_FOUND", NULL);
 	notFoundMsg:
-	    Tcl_AppendResult(interp, "this library or a dependent library"
-		    " could not be found in library path", NULL);
+	    Tcl_AppendToObj(errMsg, "this library or a dependent library"
+		    " could not be found in library path", -1);
 	    break;
 	case ERROR_PROC_NOT_FOUND:
 	    Tcl_SetErrorCode(interp, "WIN_LOAD", "PROC_NOT_FOUND", NULL);
-	    Tcl_AppendResult(interp, "A function specified in the import"
-		    " table could not be resolved by the system.  Windows"
-		    " is not telling which one, I'm sorry.", NULL);
+	    Tcl_AppendToObj(errMsg, "A function specified in the import"
+		    " table could not be resolved by the system. Windows"
+		    " is not telling which one, I'm sorry.", -1);
 	    break;
 	case ERROR_INVALID_DLL:
 	    Tcl_SetErrorCode(interp, "WIN_LOAD", "INVALID_DLL", NULL);
-	    Tcl_AppendResult(interp, "this library or a dependent library"
-		    " is damaged", NULL);
+	    Tcl_AppendToObj(errMsg, "this library or a dependent library"
+		    " is damaged", -1);
 	    break;
 	case ERROR_DLL_INIT_FAILED:
 	    Tcl_SetErrorCode(interp, "WIN_LOAD", "DLL_INIT_FAILED", NULL);
-	    Tcl_AppendResult(interp, "the library initialization"
-		    " routine failed", NULL);
+	    Tcl_AppendToObj(errMsg, "the library initialization"
+		    " routine failed", -1);
 	    break;
 	default:
 	    TclWinConvertError(lastError);
-	    Tcl_AppendResult(interp, Tcl_PosixError(interp), NULL);
+	    Tcl_AppendToObj(errMsg, Tcl_PosixError(interp), -1);
 	}
+	Tcl_SetObjResult(interp, errMsg);
 	return TCL_ERROR;
     }
 
@@ -190,7 +190,8 @@ FindSymbol(
 	Tcl_DStringFree(&ds);
     }
     if (proc == NULL && interp != NULL) {
-	Tcl_AppendResult(interp, "cannot find symbol \"", symbol, "\"", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"cannot find symbol \"%s\"", symbol));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "LOAD_SYMBOL", symbol, NULL);
     }
     return proc;
@@ -286,8 +287,9 @@ TclpTempFileNameForLibrary(
     Tcl_MutexLock(&dllDirectoryNameMutex);
     if (dllDirectoryName == NULL) {
 	if (InitDLLDirectoryName() == TCL_ERROR) {
-	    Tcl_AppendResult(interp, "couldn't create temporary directory: ",
-		    Tcl_PosixError(interp), NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "couldn't create temporary directory: %s",
+		    Tcl_PosixError(interp)));
 	    Tcl_MutexUnlock(&dllDirectoryNameMutex);
 	    return NULL;
 	}
diff --git a/win/tclWinPipe.c b/win/tclWinPipe.c
index db462f8..36ae58a 100644
--- a/win/tclWinPipe.c
+++ b/win/tclWinPipe.c
@@ -1030,8 +1030,9 @@ TclpCreateProcess(
     }
     if (startInfo.hStdInput == INVALID_HANDLE_VALUE) {
 	TclWinConvertError(GetLastError());
-	Tcl_AppendResult(interp, "couldn't duplicate input handle: ",
-		Tcl_PosixError(interp), (char *) NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't duplicate input handle: %s",
+		Tcl_PosixError(interp)));
 	goto end;
     }
 
@@ -1065,8 +1066,9 @@ TclpCreateProcess(
     }
     if (startInfo.hStdOutput == INVALID_HANDLE_VALUE) {
 	TclWinConvertError(GetLastError());
-	Tcl_AppendResult(interp, "couldn't duplicate output handle: ",
-		Tcl_PosixError(interp), (char *) NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't duplicate output handle: %s",
+		Tcl_PosixError(interp)));
 	goto end;
     }
 
@@ -1084,8 +1086,9 @@ TclpCreateProcess(
     }
     if (startInfo.hStdError == INVALID_HANDLE_VALUE) {
 	TclWinConvertError(GetLastError());
-	Tcl_AppendResult(interp, "couldn't duplicate error handle: ",
-		Tcl_PosixError(interp), (char *) NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't duplicate error handle: %s",
+		Tcl_PosixError(interp)));
 	goto end;
     }
 
@@ -1129,9 +1132,9 @@ TclpCreateProcess(
 	}
 
 	if (applType == APPL_DOS) {
-	    Tcl_AppendResult(interp,
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
 		    "DOS application process not supported on this platform",
-		    (char *) NULL);
+		    -1));
 	    Tcl_SetErrorCode(interp, "TCL", "OPERATION", "EXEC", "DOS_APP",
 		    NULL);
 	    goto end;
@@ -1158,12 +1161,12 @@ TclpCreateProcess(
 
     BuildCommandLine(execPath, argc, argv, &cmdLine);
 
-    if (CreateProcess(NULL,
-	    (TCHAR *) Tcl_DStringValue(&cmdLine), NULL, NULL, TRUE,
-	    (DWORD) createFlags, NULL, NULL, &startInfo, &procInfo) == 0) {
+    if (CreateProcess(NULL, (TCHAR *) Tcl_DStringValue(&cmdLine),
+	    NULL, NULL, TRUE, (DWORD) createFlags, NULL, NULL, &startInfo,
+	    &procInfo) == 0) {
 	TclWinConvertError(GetLastError());
-	Tcl_AppendResult(interp, "couldn't execute \"", argv[0],
-		"\": ", Tcl_PosixError(interp), (char *) NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf("couldn't execute \"%s\": %s",
+		argv[0], Tcl_PosixError(interp)));
 	goto end;
     }
 
@@ -1409,8 +1412,8 @@ ApplicationType(
 
     if (applType == APPL_NONE) {
 	TclWinConvertError(GetLastError());
-	Tcl_AppendResult(interp, "couldn't execute \"", originalName,
-		"\": ", Tcl_PosixError(interp), (char *) NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf("couldn't execute \"%s\": %s",
+		originalName, Tcl_PosixError(interp)));
 	return APPL_NONE;
     }
 
@@ -1673,8 +1676,8 @@ Tcl_CreatePipe(
 
     if (!CreatePipe(&readHandle, &writeHandle, &sec, 0)) {
 	TclWinConvertError(GetLastError());
-	Tcl_AppendResult(interp, "pipe creation failed: ",
-		Tcl_PosixError(interp), NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"pipe creation failed: %s", Tcl_PosixError(interp)));
 	return TCL_ERROR;
     }
 
diff --git a/win/tclWinPort.h b/win/tclWinPort.h
index c262671..48f7894 100644
--- a/win/tclWinPort.h
+++ b/win/tclWinPort.h
@@ -14,8 +14,8 @@
 #ifndef _TCLWINPORT
 #define _TCLWINPORT
 
-#ifndef _WIN64
-/* See [Bug 2935503]: file mtime sets wrong time */
+#if !defined(_WIN64) && defined(BUILD_tcl)
+/* See [Bug 3354324]: file mtime sets wrong time */
 #   define _USE_32BIT_TIME_T
 #endif
 
@@ -538,7 +538,6 @@ typedef DWORD_PTR * PDWORD_PTR;
 
 #define getservbyname	TclWinGetServByName
 #define getsockopt	TclWinGetSockOpt
-#define ntohs		TclWinNToHS
 #define setsockopt	TclWinSetSockOpt
 /* This type is not defined in the Windows headers */
 #define socklen_t       int
diff --git a/win/tclWinReg.c b/win/tclWinReg.c
index 9c08b0c..6ac5caf 100644
--- a/win/tclWinReg.c
+++ b/win/tclWinReg.c
@@ -15,6 +15,7 @@
 #undef STATIC_BUILD
 #undef USE_TCL_STUBS
 #define USE_TCL_STUBS
+
 #include "tclInt.h"
 #ifdef _MSC_VER
 #   pragma comment (lib, "advapi32.lib")
@@ -23,20 +24,20 @@
 
 #ifndef UNICODE
 #   undef Tcl_WinTCharToUtf
-#   define Tcl_WinTCharToUtf(a,b,c) Tcl_ExternalToUtfDString(NULL,a,b,c)
+#   define Tcl_WinTCharToUtf(a,b,c)	Tcl_ExternalToUtfDString(NULL,a,b,c)
 #   undef Tcl_WinUtfToTChar
-#   define Tcl_WinUtfToTChar(a,b,c) Tcl_UtfToExternalDString(NULL,a,b,c)
-#endif
+#   define Tcl_WinUtfToTChar(a,b,c)	Tcl_UtfToExternalDString(NULL,a,b,c)
+#endif /* !UNICODE */
 
 /*
  * Ensure that we can say which registry is being accessed.
  */
 
 #ifndef KEY_WOW64_64KEY
-#define KEY_WOW64_64KEY		(0x0100)
+#   define KEY_WOW64_64KEY	(0x0100)
 #endif
 #ifndef KEY_WOW64_32KEY
-#define KEY_WOW64_32KEY		(0x0200)
+#   define KEY_WOW64_32KEY	(0x0200)
 #endif
 
 /*
@@ -44,7 +45,7 @@
  */
 
 #ifndef MAX_KEY_LENGTH
-#define MAX_KEY_LENGTH		256
+#   define MAX_KEY_LENGTH	256
 #endif
 
 /*
@@ -57,14 +58,6 @@
 #define TCL_STORAGE_CLASS DLLEXPORT
 
 /*
- * The maximum length of a sub-key name.
- */
-
-#ifndef MAX_KEY_LENGTH
-#define MAX_KEY_LENGTH		256
-#endif
-
-/*
  * The following macros convert between different endian ints.
  */
 
@@ -172,7 +165,7 @@ Registry_Init(
 {
     Tcl_Command cmd;
 
-    if (Tcl_InitStubs(interp, "8.1", 0) == NULL) {
+    if (Tcl_InitStubs(interp, "8.5", 0) == NULL) {
 	return TCL_ERROR;
     }
 
@@ -534,9 +527,9 @@ DeleteValue(
     result = RegDeleteValue(key, (const TCHAR *)Tcl_DStringValue(&ds));
     Tcl_DStringFree(&ds);
     if (result != ERROR_SUCCESS) {
-	Tcl_AppendResult(interp, "unable to delete value \"",
-		Tcl_GetString(valueNameObj), "\" from key \"",
-		Tcl_GetString(keyNameObj), "\": ", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"unable to delete value \"%s\" from key \"%s\": ",
+		Tcl_GetString(valueNameObj), Tcl_GetString(keyNameObj)));
 	AppendSystemError(interp, result);
 	result = TCL_ERROR;
     } else {
@@ -574,7 +567,8 @@ GetKeyNames(
 {
     const char *pattern;	/* Pattern being matched against subkeys */
     HKEY key;			/* Handle to the key being examined */
-    TCHAR buffer[MAX_KEY_LENGTH];		/* Buffer to hold the subkey name */
+    TCHAR buffer[MAX_KEY_LENGTH];
+				/* Buffer to hold the subkey name */
     DWORD bufSize;		/* Size of the buffer */
     DWORD index;		/* Position of the current subkey */
     char *name;			/* Subkey name */
@@ -610,9 +604,9 @@ GetKeyNames(
 	    if (result == ERROR_NO_MORE_ITEMS) {
 		result = TCL_OK;
 	    } else {
-		Tcl_SetObjResult(interp, Tcl_NewObj());
-		Tcl_AppendResult(interp, "unable to enumerate subkeys of \"",
-			Tcl_GetString(keyNameObj), "\": ", NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"unable to enumerate subkeys of \"%s\": ",
+			Tcl_GetString(keyNameObj)));
 		AppendSystemError(interp, result);
 		result = TCL_ERROR;
 	    }
@@ -693,9 +687,9 @@ GetType(
     RegCloseKey(key);
 
     if (result != ERROR_SUCCESS) {
-	Tcl_AppendResult(interp, "unable to get type of value \"",
-		Tcl_GetString(valueNameObj), "\" from key \"",
-		Tcl_GetString(keyNameObj), "\": ", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"unable to get type of value \"%s\" from key \"%s\": ",
+		Tcl_GetString(valueNameObj), Tcl_GetString(keyNameObj)));
 	AppendSystemError(interp, result);
 	return TCL_ERROR;
     }
@@ -787,9 +781,9 @@ GetValue(
     Tcl_DStringFree(&buf);
     RegCloseKey(key);
     if (result != ERROR_SUCCESS) {
-	Tcl_AppendResult(interp, "unable to get value \"",
-		Tcl_GetString(valueNameObj), "\" from key \"",
-		Tcl_GetString(keyNameObj), "\": ", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"unable to get value \"%s\" from key \"%s\": ",
+		Tcl_GetString(valueNameObj), Tcl_GetString(keyNameObj)));
 	AppendSystemError(interp, result);
 	Tcl_DStringFree(&data);
 	return TCL_ERROR;
@@ -816,16 +810,16 @@ GetValue(
 	 * we get bogus data.
 	 */
 
-	while ((p < end)
-		&& (*((Tcl_UniChar *) p)) != 0) {
+	while ((p < end) && *((Tcl_UniChar *) p) != 0) {
 	    Tcl_UniChar *up;
+
 	    Tcl_WinTCharToUtf((TCHAR *) p, -1, &buf);
 	    Tcl_ListObjAppendElement(interp, resultPtr,
 		    Tcl_NewStringObj(Tcl_DStringValue(&buf),
 			    Tcl_DStringLength(&buf)));
 	    up = (Tcl_UniChar *) p;
 
-	    while (*up++ != 0) {}
+	    while (*up++ != 0) {/* empty body */}
 	    p = (char *) up;
 	    Tcl_DStringFree(&buf);
 	}
@@ -1110,8 +1104,8 @@ ParseKeyName(
 	rootName = name;
     }
     if (!rootName) {
-	Tcl_AppendResult(interp, "bad key \"", name,
-		"\": must start with a valid root", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"bad key \"%s\": must start with a valid root", name));
 	Tcl_SetErrorCode(interp, "WIN_REG", "NO_ROOT_KEY", NULL);
 	return TCL_ERROR;
     }
@@ -1225,8 +1219,8 @@ RecursiveDeleteKey(
 	    }
 	    break;
 	} else if (result == ERROR_SUCCESS) {
-	    result = RecursiveDeleteKey(hKey, (const TCHAR *) Tcl_DStringValue(&subkey),
-		    mode);
+	    result = RecursiveDeleteKey(hKey,
+		    (const TCHAR *) Tcl_DStringValue(&subkey), mode);
 	}
     }
     Tcl_DStringFree(&subkey);
@@ -1293,8 +1287,8 @@ SetValue(
 	    return TCL_ERROR;
 	}
 
-	value = ConvertDWORD((DWORD)type, (DWORD)value);
-	result = RegSetValueEx(key, (TCHAR *)valueName, 0,
+	value = ConvertDWORD((DWORD) type, (DWORD) value);
+	result = RegSetValueEx(key, (TCHAR *) valueName, 0,
 		(DWORD) type, (BYTE *) &value, sizeof(DWORD));
     } else if (type == REG_MULTI_SZ) {
 	Tcl_DString data, buf;
@@ -1328,7 +1322,7 @@ SetValue(
 
 	Tcl_WinUtfToTChar(Tcl_DStringValue(&data), Tcl_DStringLength(&data)+1,
 		&buf);
-	result = RegSetValueEx(key, (TCHAR *)valueName, 0,
+	result = RegSetValueEx(key, (TCHAR *) valueName, 0,
 		(DWORD) type, (BYTE *) Tcl_DStringValue(&buf),
 		(DWORD) Tcl_DStringLength(&buf));
 	Tcl_DStringFree(&data);
@@ -1337,7 +1331,7 @@ SetValue(
 	Tcl_DString buf;
 	const char *data = Tcl_GetStringFromObj(dataObj, &length);
 
-	data = (char *)Tcl_WinUtfToTChar(data, length, &buf);
+	data = (char *) Tcl_WinUtfToTChar(data, length, &buf);
 
 	/*
 	 * Include the null in the length, padding if needed for Unicode.
@@ -1346,7 +1340,7 @@ SetValue(
 	Tcl_DStringSetLength(&buf, Tcl_DStringLength(&buf)+1);
 	length = Tcl_DStringLength(&buf) + 1;
 
-	result = RegSetValueEx(key, (TCHAR *)valueName, 0,
+	result = RegSetValueEx(key, (TCHAR *) valueName, 0,
 		(DWORD) type, (BYTE *) data, (DWORD) length);
 	Tcl_DStringFree(&buf);
     } else {
@@ -1357,7 +1351,7 @@ SetValue(
 	 */
 
 	data = (BYTE *) Tcl_GetByteArrayFromObj(dataObj, &length);
-	result = RegSetValueEx(key, (TCHAR *)valueName, 0,
+	result = RegSetValueEx(key, (TCHAR *) valueName, 0,
 		(DWORD) type, data, (DWORD) length);
     }
 
@@ -1528,14 +1522,15 @@ ConvertDWORD(
     DWORD type,			/* Either REG_DWORD or REG_DWORD_BIG_ENDIAN */
     DWORD value)		/* The value to be converted. */
 {
-    DWORD order = 1;
+    const DWORD order = 1;
     DWORD localType;
 
     /*
      * Check to see if the low bit is in the first byte.
      */
 
-    localType = (*((char *) &order) == 1) ? REG_DWORD : REG_DWORD_BIG_ENDIAN;
+    localType = (*((const char *) &order) == 1)
+	    ? REG_DWORD : REG_DWORD_BIG_ENDIAN;
     return (type != localType) ? (DWORD) SWAPLONG(value) : value;
 }
 
diff --git a/win/tclWinSerial.c b/win/tclWinSerial.c
index 58a9eb4..9e9d1af 100644
--- a/win/tclWinSerial.c
+++ b/win/tclWinSerial.c
@@ -1673,12 +1673,7 @@ SerialSetOptionProc(
 
     if ((len > 2) && (strncmp(optionName, "-mode", len) == 0)) {
 	if (!GetCommState(infoPtr->handle, &dcb)) {
-	    if (interp != NULL) {
-		TclWinConvertError(GetLastError());
-		Tcl_AppendResult(interp, "can't get comm state: ",
-			Tcl_PosixError(interp), NULL);
-	    }
-	    return TCL_ERROR;
+	    goto getStateFailed;
 	}
 	native = Tcl_WinUtfToTChar(value, -1, &ds);
 	result = BuildCommDCB(native, &dcb);
@@ -1686,8 +1681,9 @@ SerialSetOptionProc(
 
 	if (result == FALSE) {
 	    if (interp != NULL) {
-		Tcl_AppendResult(interp, "bad value \"", value,
-			"\" for -mode: should be baud,parity,data,stop", NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"bad value \"%s\" for -mode: should be baud,parity,data,stop",
+			value));
 		Tcl_SetErrorCode(interp, "TCL", "VALUE", "SERIALMODE", NULL);
 	    }
 	    return TCL_ERROR;
@@ -1703,12 +1699,7 @@ SerialSetOptionProc(
 	dcb.fAbortOnError = FALSE;
 
 	if (!SetCommState(infoPtr->handle, &dcb)) {
-	    if (interp != NULL) {
-		TclWinConvertError(GetLastError());
-		Tcl_AppendResult(interp, "can't set comm state: ",
-			Tcl_PosixError(interp), NULL);
-	    }
-	    return TCL_ERROR;
+	    goto setStateFailed;
 	}
 	return TCL_OK;
     }
@@ -1719,12 +1710,7 @@ SerialSetOptionProc(
 
     if ((len > 1) && (strncmp(optionName, "-handshake", len) == 0)) {
 	if (!GetCommState(infoPtr->handle, &dcb)) {
-	    if (interp != NULL) {
-		TclWinConvertError(GetLastError());
-		Tcl_AppendResult(interp, "can't get comm state: ",
-			Tcl_PosixError(interp), NULL);
-	    }
-	    return TCL_ERROR;
+	    goto getStateFailed;
 	}
 
 	/*
@@ -1759,21 +1745,16 @@ SerialSetOptionProc(
 	    dcb.fDtrControl = DTR_CONTROL_HANDSHAKE;
 	} else {
 	    if (interp != NULL) {
-		Tcl_AppendResult(interp, "bad value \"", value,
-			"\" for -handshake: must be one of xonxoff, rtscts, "
-			"dtrdsr or none", NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"bad value \"%s\" for -handshake: must be one of"
+			" xonxoff, rtscts, dtrdsr or none", value));
 		Tcl_SetErrorCode(interp, "TCL", "VALUE", "HANDSHAKE", NULL);
 	    }
 	    return TCL_ERROR;
 	}
 
 	if (!SetCommState(infoPtr->handle, &dcb)) {
-	    if (interp != NULL) {
-		TclWinConvertError(GetLastError());
-		Tcl_AppendResult(interp, "can't set comm state: ",
-			Tcl_PosixError(interp), NULL);
-	    }
-	    return TCL_ERROR;
+	    goto setStateFailed;
 	}
 	return TCL_OK;
     }
@@ -1784,12 +1765,7 @@ SerialSetOptionProc(
 
     if ((len > 1) && (strncmp(optionName, "-xchar", len) == 0)) {
 	if (!GetCommState(infoPtr->handle, &dcb)) {
-	    if (interp != NULL) {
-		TclWinConvertError(GetLastError());
-		Tcl_AppendResult(interp, "can't get comm state: ",
-			Tcl_PosixError(interp), NULL);
-	    }
-	    return TCL_ERROR;
+	    goto getStateFailed;
 	}
 
 	if (Tcl_SplitList(interp, value, &argc, &argv) == TCL_ERROR) {
@@ -1798,9 +1774,9 @@ SerialSetOptionProc(
 	if (argc != 2) {
 	badXchar:
 	    if (interp != NULL) {
-		Tcl_AppendResult(interp, "bad value for -xchar: should be "
-			"a list of two elements with each a single character",
-			NULL);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"bad value for -xchar: should be a list of"
+			" two elements with each a single character", -1));
 		Tcl_SetErrorCode(interp, "TCL", "VALUE", "XCHAR", NULL);
 	    }
 	    ckfree(argv);
@@ -1837,12 +1813,7 @@ SerialSetOptionProc(
 	ckfree(argv);
 
 	if (!SetCommState(infoPtr->handle, &dcb)) {
-	    if (interp != NULL) {
-		TclWinConvertError(GetLastError());
-		Tcl_AppendResult(interp, "can't set comm state: ",
-			Tcl_PosixError(interp), NULL);
-	    }
-	    return TCL_ERROR;
+	    goto setStateFailed;
 	}
 	return TCL_OK;
     }
@@ -1859,9 +1830,9 @@ SerialSetOptionProc(
 	}
 	if ((argc % 2) == 1) {
 	    if (interp != NULL) {
-		Tcl_AppendResult(interp, "bad value \"", value,
-			"\" for -ttycontrol: should be a list of "
-			"signal,value pairs", NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"bad value \"%s\" for -ttycontrol: should be "
+			"a list of signal,value pairs", value));
 		Tcl_SetErrorCode(interp, "TCL", "VALUE", "TTYCONTROL", NULL);
 	    }
 	    ckfree(argv);
@@ -1877,7 +1848,8 @@ SerialSetOptionProc(
 		if (!EscapeCommFunction(infoPtr->handle,
 			(DWORD) (flag ? SETDTR : CLRDTR))) {
 		    if (interp != NULL) {
-			Tcl_AppendResult(interp, "can't set DTR signal", NULL);
+			Tcl_SetObjResult(interp, Tcl_NewStringObj(
+				"can't set DTR signal", -1));
 			Tcl_SetErrorCode(interp, "TCL", "OPERATION",
 				"FCONFIGURE", "TTY_SIGNAL", NULL);
 		    }
@@ -1888,7 +1860,8 @@ SerialSetOptionProc(
 		if (!EscapeCommFunction(infoPtr->handle,
 			(DWORD) (flag ? SETRTS : CLRRTS))) {
 		    if (interp != NULL) {
-			Tcl_AppendResult(interp, "can't set RTS signal", NULL);
+			Tcl_SetObjResult(interp, Tcl_NewStringObj(
+				"can't set RTS signal", -1));
 			Tcl_SetErrorCode(interp, "TCL", "OPERATION",
 				"FCONFIGURE", "TTY_SIGNAL", NULL);
 		    }
@@ -1899,7 +1872,8 @@ SerialSetOptionProc(
 		if (!EscapeCommFunction(infoPtr->handle,
 			(DWORD) (flag ? SETBREAK : CLRBREAK))) {
 		    if (interp != NULL) {
-			Tcl_AppendResult(interp,"can't set BREAK signal",NULL);
+			Tcl_SetObjResult(interp, Tcl_NewStringObj(
+				"can't set BREAK signal", -1));
 			Tcl_SetErrorCode(interp, "TCL", "OPERATION",
 				"FCONFIGURE", "TTY_SIGNAL", NULL);
 		    }
@@ -1908,9 +1882,9 @@ SerialSetOptionProc(
 		}
 	    } else {
 		if (interp != NULL) {
-		    Tcl_AppendResult(interp, "bad signal name \"", argv[i],
-			    "\" for -ttycontrol: must be DTR, RTS or BREAK",
-			    NULL);
+		    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			    "bad signal name \"%s\" for -ttycontrol: must be"
+			    " DTR, RTS or BREAK", argv[i]));
 		    Tcl_SetErrorCode(interp, "TCL", "VALUE", "TTY_SIGNAL",
 			    NULL);
 		}
@@ -1949,9 +1923,9 @@ SerialSetOptionProc(
 
 	if ((argc < 1) || (argc > 2) || (inSize <= 0) || (outSize <= 0)) {
 	    if (interp != NULL) {
-		Tcl_AppendResult(interp, "bad value \"", value,
-			"\" for -sysbuffer: should be a list of one or two "
-			"integers > 0", NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"bad value \"%s\" for -sysbuffer: should be "
+			"a list of one or two integers > 0", value));
 		Tcl_SetErrorCode(interp, "TCL", "VALUE", "SYS_BUFFER", NULL);
 	    }
 	    return TCL_ERROR;
@@ -1960,8 +1934,9 @@ SerialSetOptionProc(
 	if (!SetupComm(infoPtr->handle, inSize, outSize)) {
 	    if (interp != NULL) {
 		TclWinConvertError(GetLastError());
-		Tcl_AppendResult(interp, "can't setup comm buffers: ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"can't setup comm buffers: %s",
+			Tcl_PosixError(interp)));
 	    }
 	    return TCL_ERROR;
 	}
@@ -1974,22 +1949,12 @@ SerialSetOptionProc(
 	 */
 
 	if (!GetCommState(infoPtr->handle, &dcb)) {
-	    if (interp != NULL) {
-		TclWinConvertError(GetLastError());
-		Tcl_AppendResult(interp, "can't get comm state: ",
-			Tcl_PosixError(interp), NULL);
-	    }
-	    return TCL_ERROR;
+	    goto getStateFailed;
 	}
 	dcb.XonLim = (WORD) (infoPtr->sysBufRead*1/2);
 	dcb.XoffLim = (WORD) (infoPtr->sysBufRead*1/4);
 	if (!SetCommState(infoPtr->handle, &dcb)) {
-	    if (interp != NULL) {
-		TclWinConvertError(GetLastError());
-		Tcl_AppendResult(interp, "can't set comm state: ",
-			Tcl_PosixError(interp), NULL);
-	    }
-	    return TCL_ERROR;
+	    goto setStateFailed;
 	}
 	return TCL_OK;
     }
@@ -2020,8 +1985,9 @@ SerialSetOptionProc(
 	if (!SetCommTimeouts(infoPtr->handle, &tout)) {
 	    if (interp != NULL) {
 		TclWinConvertError(GetLastError());
-		Tcl_AppendResult(interp, "can't set comm timeouts: ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"can't set comm timeouts: %s",
+			Tcl_PosixError(interp)));
 	    }
 	    return TCL_ERROR;
 	}
@@ -2031,6 +1997,22 @@ SerialSetOptionProc(
 
     return Tcl_BadChannelOption(interp, optionName,
 	    "mode handshake pollinterval sysbuffer timeout ttycontrol xchar");
+
+  getStateFailed:
+    if (interp != NULL) {
+	TclWinConvertError(GetLastError());
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"can't get comm state: %s", Tcl_PosixError(interp)));
+    }
+    return TCL_ERROR;
+
+  setStateFailed:
+    if (interp != NULL) {
+	TclWinConvertError(GetLastError());
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"can't set comm state: %s", Tcl_PosixError(interp)));
+    }
+    return TCL_ERROR;
 }
 
 /*
@@ -2089,8 +2071,8 @@ SerialGetOptionProc(
 	if (!GetCommState(infoPtr->handle, &dcb)) {
 	    if (interp != NULL) {
 		TclWinConvertError(GetLastError());
-		Tcl_AppendResult(interp, "can't get comm state: ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"can't get comm state: %s", Tcl_PosixError(interp)));
 	    }
 	    return TCL_ERROR;
 	}
@@ -2159,8 +2141,8 @@ SerialGetOptionProc(
 	if (!GetCommState(infoPtr->handle, &dcb)) {
 	    if (interp != NULL) {
 		TclWinConvertError(GetLastError());
-		Tcl_AppendResult(interp, "can't get comm state: ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"can't get comm state: %s", Tcl_PosixError(interp)));
 	    }
 	    return TCL_ERROR;
 	}
@@ -2237,8 +2219,8 @@ SerialGetOptionProc(
 	if (!GetCommModemStatus(infoPtr->handle, &status)) {
 	    if (interp != NULL) {
 		TclWinConvertError(GetLastError());
-		Tcl_AppendResult(interp, "can't get tty status: ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"can't get tty status: %s", Tcl_PosixError(interp)));
 	    }
 	    return TCL_ERROR;
 	}
@@ -2248,10 +2230,9 @@ SerialGetOptionProc(
 
     if (valid) {
 	return TCL_OK;
-    } else {
-	return Tcl_BadChannelOption(interp, optionName,
-		"mode pollinterval lasterror queue sysbuffer ttystatus xchar");
     }
+    return Tcl_BadChannelOption(interp, optionName,
+	    "mode pollinterval lasterror queue sysbuffer ttystatus xchar");
 }
 
 /*
diff --git a/win/tclWinSock.c b/win/tclWinSock.c
index 97b10a3..1a74354 100644
--- a/win/tclWinSock.c
+++ b/win/tclWinSock.c
@@ -72,7 +72,6 @@
 
 #undef getservbyname
 #undef getsockopt
-#undef ntohs
 #undef setsockopt
 
 /*
@@ -163,7 +162,7 @@ struct SocketInfo {
  * socket event occurs.
  */
 
-typedef struct SocketEvent {
+typedef struct {
     Tcl_Event header;		/* Information that is standard for all
 				 * events. */
     SOCKET socket;		/* Socket descriptor that is ready. Used to
@@ -191,7 +190,7 @@ typedef struct SocketEvent {
 #define SOCKET_PENDING		(1<<3)	/* A message has been sent for this
 					 * socket */
 
-typedef struct ThreadSpecificData {
+typedef struct {
     HWND hwnd;			/* Handle to window for socket messages. */
     HANDLE socketThread;	/* Thread handling the window */
     Tcl_ThreadId threadId;	/* Parent thread. */
@@ -220,7 +219,7 @@ static void		SocketExitHandler(ClientData clientData);
 static LRESULT CALLBACK	SocketProc(HWND hwnd, UINT message, WPARAM wParam,
 			    LPARAM lParam);
 static int		SocketsEnabled(void);
-static void		TcpAccept(TcpFdList *fds);
+static void		TcpAccept(TcpFdList *fds, SOCKET newSocket, address addr);
 static int		WaitForSocketEvent(SocketInfo *infoPtr, int events,
 			    int *errorCodePtr);
 static DWORD WINAPI	SocketThread(LPVOID arg);
@@ -558,8 +557,8 @@ TclpHasSockets(
 	return TCL_OK;
     }
     if (interp != NULL) {
-	Tcl_AppendResult(interp, "sockets are not available on this system",
-		NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"sockets are not available on this system", -1));
     }
     return TCL_ERROR;
 }
@@ -692,6 +691,9 @@ SocketEventProc(
     int mask = 0, events;
     ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
     TcpFdList *fds;
+    SOCKET newSocket;
+    address addr;
+    int len;
 
     if (!(flags & TCL_FILE_EVENTS)) {
 	return 0;
@@ -708,13 +710,13 @@ SocketEventProc(
 	    break;
 	}
     }
-    SetEvent(tsdPtr->socketListLock);
 
     /*
      * Discard events that have gone stale.
      */
 
     if (!infoPtr) {
+        SetEvent(tsdPtr->socketListLock);
 	return 1;
     }
 
@@ -726,11 +728,65 @@ SocketEventProc(
 
     if (infoPtr->readyEvents & FD_ACCEPT) {
 	for (fds = infoPtr->sockets; fds != NULL; fds = fds->next) {
-	    TcpAccept(fds);
+
+	    /*
+	    * Accept the incoming connection request.
+	    */
+	    len = sizeof(address);
+
+	    newSocket = accept(fds->fd, &(addr.sa), &len);
+
+	    /* On Tcl server sockets with multiple OS fds we loop over the fds trying
+	     * an accept() on each, so we expect INVALID_SOCKET.  There are also other
+	     * network stack conditions that can result in FD_ACCEPT but a subsequent
+	     * failure on accept() by the time we get around to it.
+	     * Access to sockets (acceptEventCount, readyEvents) in socketList
+	     * is still protected by the lock (prevents reintroduction of 
+	     * SF Tcl Bug 3056775.
+	     */
+
+	    if (newSocket == INVALID_SOCKET) {
+		/* int err = WSAGetLastError(); */
+		continue;
+	    }
+
+	    /*
+	     * It is possible that more than one FD_ACCEPT has been sent, so an extra
+	     * count must be kept. Decrement the count, and reset the readyEvent bit
+	     * if the count is no longer > 0.
+	     */
+	    infoPtr->acceptEventCount--;
+
+	    if (infoPtr->acceptEventCount <= 0) {
+		infoPtr->readyEvents &= ~(FD_ACCEPT);
+	    }
+
+	    SetEvent(tsdPtr->socketListLock);
+
+	    /* Caution: TcpAccept() has the side-effect of evaluating the server
+	     * accept script (via AcceptCallbackProc() in tclIOCmd.c), which can
+	     * close the server socket and invalidate infoPtr and fds.
+	     * If TcpAccept() accepts a socket we must return immediately and let
+	     * SocketCheckProc queue additional FD_ACCEPT events.
+	     */
+	    TcpAccept(fds, newSocket, addr);
+	    return 1;
 	}
+
+	/* Loop terminated with no sockets accepted; clear the ready mask so 
+	 * we can detect the next connection request. Note that connection 
+	 * requests are level triggered, so if there is a request already 
+	 * pending, a new event will be generated.
+	 */
+	infoPtr->acceptEventCount = 0;
+	infoPtr->readyEvents &= ~(FD_ACCEPT);
+
+	SetEvent(tsdPtr->socketListLock);
 	return 1;
     }
 
+    SetEvent(tsdPtr->socketListLock);
+
     /*
      * Mask off unwanted events and compute the read/write mask so we can
      * notify the channel.
@@ -872,9 +928,15 @@ TcpCloseProc(
 	 * background.
 	 */
 
-	if (closesocket(infoPtr->sockets->fd) == SOCKET_ERROR) {
-	    TclWinConvertError((DWORD) WSAGetLastError());
-	    errorCode = Tcl_GetErrno();
+	while ( infoPtr->sockets != NULL ) {
+	    TcpFdList *thisfd = infoPtr->sockets;
+	    infoPtr->sockets = thisfd->next;
+
+	    if (closesocket(thisfd->fd) == SOCKET_ERROR) {
+		TclWinConvertError((DWORD) WSAGetLastError());
+		errorCode = Tcl_GetErrno();
+	    }
+	    ckfree(thisfd);
 	}
     }
 
@@ -928,12 +990,14 @@ TcpClose2Proc(
 	break;
     default:
 	if (interp) {
-	    Tcl_AppendResult(interp,
-		    "Socket close2proc called bidirectionally", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "Socket close2proc called bidirectionally", -1));
 	}
 	return TCL_ERROR;
     }
 
+    /* single fd operation: Tcl_OpenTcpServer() does not set TCL_READABLE or
+     * TCL_WRITABLE so this should never be called for a server socket. */
     if (shutdown(infoPtr->sockets->fd, sd) == SOCKET_ERROR) {
 	TclWinConvertError((DWORD) WSAGetLastError());
 	errorCode = Tcl_GetErrno();
@@ -945,6 +1009,51 @@ TcpClose2Proc(
 /*
  *----------------------------------------------------------------------
  *
+ * AddSocketInfoFd --
+ *
+ *	This function adds a SOCKET file descriptor to the 'sockets' linked 
+ *	list of a SocketInfo structure.
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	None, except for allocation of memory.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void
+AddSocketInfoFd(
+    SocketInfo *infoPtr, 
+    SOCKET socket)
+{
+    TcpFdList *fds = infoPtr->sockets;
+
+    if ( fds == NULL ) {
+	/* Add the first FD */
+	infoPtr->sockets = ckalloc(sizeof(TcpFdList));
+	fds = infoPtr->sockets;
+    } else {
+	/* Find end of list and append FD */
+	while ( fds->next != NULL ) {
+	    fds = fds->next;
+	}
+    
+	fds->next = ckalloc(sizeof(TcpFdList));
+	fds = fds->next;
+    }
+
+    /* Populate new FD */
+    fds->fd = socket;
+    fds->infoPtr = infoPtr;
+    fds->next = NULL;
+}
+
+    
+/*
+ *----------------------------------------------------------------------
+ *
  * NewSocketInfo --
  *
  *	This function allocates and initializes a new SocketInfo structure.
@@ -963,14 +1072,10 @@ NewSocketInfo(
     SOCKET socket)
 {
     SocketInfo *infoPtr = ckalloc(sizeof(SocketInfo));
-    TcpFdList *fds = ckalloc(sizeof(TcpFdList));
 
-    fds->fd = socket;
-    fds->next = NULL;
-    fds->infoPtr = infoPtr;
     /* ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); */
     infoPtr->channel = 0;
-    infoPtr->sockets = fds;
+    infoPtr->sockets = NULL;
     infoPtr->flags = 0;
     infoPtr->watchEvents = 0;
     infoPtr->readyEvents = 0;
@@ -988,6 +1093,8 @@ NewSocketInfo(
 
     infoPtr->nextPtr = NULL;
 
+    AddSocketInfoFd(infoPtr, socket);
+
     return infoPtr;
 }
 
@@ -1057,7 +1164,6 @@ CreateSocket(
     }
 
     if (server) {
-	TcpFdList *fds = NULL, *newfds;
 
 	for (addrPtr = addrlist; addrPtr != NULL; addrPtr = addrPtr->ai_next) {
 	    sock = socket(addrPtr->ai_family, SOCK_STREAM, 0);
@@ -1140,7 +1246,6 @@ CreateSocket(
 		 */
 
 		infoPtr = NewSocketInfo(sock);
-		fds = infoPtr->sockets;
 
 		/*
 		 * Set up the select mask for connection request events.
@@ -1150,13 +1255,7 @@ CreateSocket(
 		infoPtr->watchEvents |= FD_ACCEPT;
 
 	    } else {
-		newfds = ckalloc(sizeof(TcpFdList));
-		memset(newfds, (int) 0, sizeof(TcpFdList));
-		newfds->fd = sock;
-		newfds->infoPtr = infoPtr;
-		newfds->next = NULL;
-		fds->next = newfds;
-		fds = newfds;
+		AddSocketInfoFd( infoPtr, sock );
 	    }
 	}
     } else {
@@ -1280,12 +1379,9 @@ CreateSocket(
     }
 
     if (interp != NULL) {
-        Tcl_AppendResult(interp, "couldn't open socket: ", NULL);
-        if (errorMsg == NULL) {
-            Tcl_AppendResult(interp, Tcl_PosixError(interp), NULL);
-        } else {
-            Tcl_AppendResult(interp, errorMsg, NULL);
-        }
+        Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't open socket: %s",
+		(errorMsg ? errorMsg : Tcl_PosixError(interp))));
     }
 
     if (sock != INVALID_SOCKET) {
@@ -1537,8 +1633,9 @@ Tcl_OpenTcpServer(
  *
  * TcpAccept --
  *
- *	Accept a TCP socket connection. This is called by SocketEventProc and
- *	it in turns calls the registered accept function.
+ *	Creates a channel for a newly accepted socket connection. This is 
+ *	called by SocketEventProc and it in turns calls the registered 
+ *	accept function.
  *
  * Results:
  *	None.
@@ -1551,60 +1648,18 @@ Tcl_OpenTcpServer(
 
 static void
 TcpAccept(
-    TcpFdList *fds)	/* Socket to accept. */
+    TcpFdList *fds,	/* Server socket that accepted newSocket. */
+    SOCKET newSocket,   /* Newly accepted socket. */
+    address addr)       /* Address of new socket. */
 {
-    SOCKET newSocket;
     SocketInfo *newInfoPtr;
     SocketInfo *infoPtr = fds->infoPtr;
-    SOCKADDR_IN addr;
-    int len;
+    int len = sizeof(addr);
     char channelName[16 + TCL_INTEGER_SPACE];
+    char host[NI_MAXHOST], port[NI_MAXSERV];
     ThreadSpecificData *tsdPtr = TclThreadDataKeyGet(&dataKey);
 
     /*
-     * Accept the incoming connection request.
-     */
-
-    len = sizeof(SOCKADDR_IN);
-
-    newSocket = accept(fds->fd, (SOCKADDR *) &addr, &len);
-
-    /*
-     * Protect access to sockets (acceptEventCount, readyEvents) in socketList
-     * by the lock.  Fix for SF Tcl Bug 3056775.
-     */
-
-    WaitForSingleObject(tsdPtr->socketListLock, INFINITE);
-
-    /*
-     * Clear the ready mask so we can detect the next connection request. Note
-     * that connection requests are level triggered, so if there is a request
-     * already pending, a new event will be generated.
-     */
-
-    if (newSocket == INVALID_SOCKET) {
-	infoPtr->acceptEventCount = 0;
-	infoPtr->readyEvents &= ~(FD_ACCEPT);
-
-	SetEvent(tsdPtr->socketListLock);
-	return;
-    }
-
-    /*
-     * It is possible that more than one FD_ACCEPT has been sent, so an extra
-     * count must be kept. Decrement the count, and reset the readyEvent bit
-     * if the count is no longer > 0.
-     */
-
-    infoPtr->acceptEventCount--;
-
-    if (infoPtr->acceptEventCount <= 0) {
-	infoPtr->readyEvents &= ~(FD_ACCEPT);
-    }
-
-    SetEvent(tsdPtr->socketListLock);
-
-    /*
      * Win-NT has a misfeature that sockets are inherited in child processes
      * by default. Turn off the inherit bit.
      */
@@ -1644,8 +1699,10 @@ TcpAccept(
      */
 
     if (infoPtr->acceptProc != NULL) {
+	getnameinfo(&(addr.sa), len, host, sizeof(host), port, sizeof(port),
+                    NI_NUMERICHOST|NI_NUMERICSERV);
 	infoPtr->acceptProc(infoPtr->acceptProcData, newInfoPtr->channel,
-		inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));
+			    host, atoi(port));
     }
 }
 
@@ -1720,6 +1777,7 @@ TcpInputProc(
     while (1) {
 	SendMessage(tsdPtr->hwnd, SOCKET_SELECT,
 		(WPARAM) UNSELECT, (LPARAM) infoPtr);
+	/* single fd operation: this proc is only called for a connected socket. */
 	bytesRead = recv(infoPtr->sockets->fd, buf, toRead, 0);
 	infoPtr->readyEvents &= ~(FD_READ);
 
@@ -1840,6 +1898,7 @@ TcpOutputProc(
 	SendMessage(tsdPtr->hwnd, SOCKET_SELECT,
 		(WPARAM) UNSELECT, (LPARAM) infoPtr);
 
+	/* single fd operation: this proc is only called for a connected socket. */
 	bytesWritten = send(infoPtr->sockets->fd, buf, toWrite, 0);
 	if (bytesWritten != SOCKET_ERROR) {
 	    /*
@@ -1929,12 +1988,14 @@ TcpSetOptionProc(
 
     if (!SocketsEnabled()) {
 	if (interp) {
-	    Tcl_AppendResult(interp, "winsock is not initialized", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "winsock is not initialized", -1));
 	}
 	return TCL_ERROR;
     }
 
 #ifdef TCL_FEATURE_KEEPALIVE_NAGLE
+    #error "TCL_FEATURE_KEEPALIVE_NAGLE not reviewed for whether to treat infoPtr->sockets as single fd or list"
     sock = infoPtr->sockets->fd;
 
     if (!strcasecmp(optionName, "-keepalive")) {
@@ -1952,8 +2013,9 @@ TcpSetOptionProc(
 	if (rtn != 0) {
 	    TclWinConvertError(WSAGetLastError());
 	    if (interp) {
-		Tcl_AppendResult(interp, "couldn't set socket option: ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"couldn't set socket option: %s",
+			Tcl_PosixError(interp)));
 	    }
 	    return TCL_ERROR;
 	}
@@ -1973,8 +2035,9 @@ TcpSetOptionProc(
 	if (rtn != 0) {
 	    TclWinConvertError(WSAGetLastError());
 	    if (interp) {
-		Tcl_AppendResult(interp, "couldn't set socket option: ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"couldn't set socket option: %s",
+			Tcl_PosixError(interp)));
 	    }
 	    return TCL_ERROR;
 	}
@@ -2032,7 +2095,8 @@ TcpGetOptionProc(
 
     if (!SocketsEnabled()) {
 	if (interp) {
-	    Tcl_AppendResult(interp, "winsock is not initialized", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "winsock is not initialized", -1));
 	}
 	return TCL_ERROR;
     }
@@ -2099,8 +2163,9 @@ TcpGetOptionProc(
 	    if (len) {
 		TclWinConvertError((DWORD) WSAGetLastError());
 		if (interp) {
-		    Tcl_AppendResult(interp, "can't get peername: ",
-			    Tcl_PosixError(interp), NULL);
+		    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			    "can't get peername: %s",
+			    Tcl_PosixError(interp)));
 		}
 		return TCL_ERROR;
 	    }
@@ -2164,8 +2229,8 @@ TcpGetOptionProc(
 	} else {
 	    if (interp) {
 		TclWinConvertError((DWORD) WSAGetLastError());
-		Tcl_AppendResult(interp, "can't get sockname: ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"can't get sockname: %s", Tcl_PosixError(interp)));
 	    }
 	    return TCL_ERROR;
 	}
@@ -2398,6 +2463,7 @@ SocketProc(
     int event, error;
     SOCKET socket;
     SocketInfo *infoPtr;
+    TcpFdList *fds = NULL;
     ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
 #ifdef _WIN64
 	    GetWindowLongPtr(hwnd, GWLP_USERDATA);
@@ -2442,58 +2508,60 @@ SocketProc(
 	WaitForSingleObject(tsdPtr->socketListLock, INFINITE);
 	for (infoPtr = tsdPtr->socketList; infoPtr != NULL;
 		infoPtr = infoPtr->nextPtr) {
-	    if (infoPtr->sockets->fd == socket) {
-		/*
-		 * Update the socket state.
-		 *
-		 * A count of FD_ACCEPTS is stored, so if an FD_CLOSE event
-		 * happens, then clear the FD_ACCEPT count. Otherwise,
-		 * increment the count if the current event is an FD_ACCEPT.
-		 */
-
-		if (event & FD_CLOSE) {
-		    infoPtr->acceptEventCount = 0;
-		    infoPtr->readyEvents &= ~(FD_WRITE|FD_ACCEPT);
-		} else if (event & FD_ACCEPT) {
-		    infoPtr->acceptEventCount++;
-		}
-
-		if (event & FD_CONNECT) {
+	    for (fds = infoPtr->sockets; fds != NULL; fds = fds->next) {
+		if (fds->fd == socket) {
 		    /*
-		     * The socket is now connected, clear the async connect
-		     * flag.
+		     * Update the socket state.
+		     *
+		     * A count of FD_ACCEPTS is stored, so if an FD_CLOSE event
+		     * happens, then clear the FD_ACCEPT count. Otherwise,
+		     * increment the count if the current event is an FD_ACCEPT.
 		     */
 
-		    infoPtr->flags &= ~(SOCKET_ASYNC_CONNECT);
+		    if (event & FD_CLOSE) {
+			infoPtr->acceptEventCount = 0;
+			infoPtr->readyEvents &= ~(FD_WRITE|FD_ACCEPT);
+		    } else if (event & FD_ACCEPT) {
+			infoPtr->acceptEventCount++;
+		    }
+
+		    if (event & FD_CONNECT) {
+			/*
+			 * The socket is now connected, clear the async connect
+			 * flag.
+			 */
 
-		    /*
-		     * Remember any error that occurred so we can report
-		     * connection failures.
-		     */
+			infoPtr->flags &= ~(SOCKET_ASYNC_CONNECT);
+
+			/*
+			 * Remember any error that occurred so we can report
+			 * connection failures.
+			 */
 
-		    if (error != ERROR_SUCCESS) {
-			TclWinConvertError((DWORD) error);
-			infoPtr->lastError = Tcl_GetErrno();
+			if (error != ERROR_SUCCESS) {
+			    TclWinConvertError((DWORD) error);
+			    infoPtr->lastError = Tcl_GetErrno();
+			}
 		    }
-		}
 
-		if (infoPtr->flags & SOCKET_ASYNC_CONNECT) {
-		    infoPtr->flags &= ~(SOCKET_ASYNC_CONNECT);
-		    if (error != ERROR_SUCCESS) {
-			TclWinConvertError((DWORD) error);
-			infoPtr->lastError = Tcl_GetErrno();
+		    if (infoPtr->flags & SOCKET_ASYNC_CONNECT) {
+			infoPtr->flags &= ~(SOCKET_ASYNC_CONNECT);
+			if (error != ERROR_SUCCESS) {
+			    TclWinConvertError((DWORD) error);
+			    infoPtr->lastError = Tcl_GetErrno();
+			}
+			infoPtr->readyEvents |= FD_WRITE;
 		    }
-		    infoPtr->readyEvents |= FD_WRITE;
-		}
-		infoPtr->readyEvents |= event;
+		    infoPtr->readyEvents |= event;
 
-		/*
-		 * Wake up the Main Thread.
-		 */
+		    /*
+		     * Wake up the Main Thread.
+		     */
 
-		SetEvent(tsdPtr->readyEvent);
-		Tcl_ThreadAlert(tsdPtr->threadId);
-		break;
+		    SetEvent(tsdPtr->readyEvent);
+		    Tcl_ThreadAlert(tsdPtr->threadId);
+		    break;
+		}
 	    }
 	}
 	SetEvent(tsdPtr->socketListLock);
@@ -2501,15 +2569,18 @@ SocketProc(
 
     case SOCKET_SELECT:
 	infoPtr = (SocketInfo *) lParam;
-	if (wParam == SELECT) {
-	    WSAAsyncSelect(infoPtr->sockets->fd, hwnd,
-		    SOCKET_MESSAGE, infoPtr->selectEvents);
-	} else {
-	    /*
-	     * Clear the selection mask
-	     */
+	for (fds = infoPtr->sockets; fds != NULL; fds = fds->next) {
+	    infoPtr = (SocketInfo *) lParam;
+	    if (wParam == SELECT) {
+		WSAAsyncSelect(fds->fd, hwnd,
+			SOCKET_MESSAGE, infoPtr->selectEvents);
+	    } else {
+		/*
+		 * Clear the selection mask
+		 */
 
-	    WSAAsyncSelect(infoPtr->sockets->fd, hwnd, 0, 0);
+		WSAAsyncSelect(fds->fd, hwnd, 0, 0);
+	    }
 	}
 	break;
 
@@ -2664,23 +2735,6 @@ TclWinSetSockOpt(
     return setsockopt(s, level, optname, optval, optlen);
 }
 
-unsigned short
-TclWinNToHS(
-    unsigned short netshort)
-{
-    /*
-     * Check that WinSock is initialized; do not call it if not, to prevent
-     * system crashes. This can happen at exit time if the exit handler for
-     * WinSock ran before other exit handlers that want to use sockets.
-     */
-
-    if (!SocketsEnabled()) {
-	return (unsigned short) -1;
-    }
-
-    return ntohs(netshort);
-}
-
 char *
 TclpInetNtoa(
     struct in_addr addr)
diff --git a/win/tclooConfig.sh b/win/tclooConfig.sh
index 68de106..dce540a 100644
--- a/win/tclooConfig.sh
+++ b/win/tclooConfig.sh
@@ -16,4 +16,4 @@ TCLOO_STUB_LIB_SPEC=""
 TCLOO_INCLUDE_SPEC=""
 TCLOO_PRIVATE_INCLUDE_SPEC=""
 TCLOO_CFLAGS=-DUSE_TCLOO_STUBS
-TCLOO_VERSION=0.6.3
+TCLOO_VERSION=0.7