Add flag to lists so that evaluating contexts can handle them efficiently much

of the time even when they are not pure. The flag works by keeping track of
when the string rep was derived from the internal rep.

4 files changed, 1038 insertions, 963 deletions

diff --git a/generic/tclBasic.c b/generic/tclBasic.c
index a259130..e9c12d9 100644
--- a/generic/tclBasic.c
+++ b/generic/tclBasic.c
@@ -2,18 +2,18 @@
  * tclBasic.c --
  *
  *	Contains the basic facilities for TCL command interpretation,
- *	including interpreter creation and deletion, command creation
- *	and deletion, and command/script execution. 
+ *	including interpreter creation and deletion, command creation and
+ *	deletion, and command/script execution.
  *
  * Copyright (c) 1987-1994 The Regents of the University of California.
  * Copyright (c) 1994-1997 Sun Microsystems, Inc.
  * Copyright (c) 1998-1999 by Scriptics Corporation.
  * Copyright (c) 2001, 2002 by Kevin B. Kenny.  All rights reserved.
  *
- * See the file "license.terms" for information on usage and redistribution
- * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+ * See the file "license.terms" for information on usage and redistribution of
+ * this file, and for a DISCLAIMER OF ALL WARRANTIES.
  *
- * RCS: @(#) $Id: tclBasic.c,v 1.168 2005/08/29 16:18:59 kennykb Exp $
+ * RCS: @(#) $Id: tclBasic.c,v 1.169 2005/09/06 14:40:10 dkf Exp $
  */
 
 #include "tclInt.h"
@@ -37,47 +37,46 @@ typedef struct OldMathFuncData {
  * Static procedures in this file:
  */
 
-static char *	CallCommandTraces _ANSI_ARGS_((Interp *iPtr, Command *cmdPtr,
-		    CONST char *oldName, CONST char* newName, int flags));
-static void	DeleteInterpProc _ANSI_ARGS_((Tcl_Interp *interp));
-static void	ProcessUnexpectedResult _ANSI_ARGS_((Tcl_Interp *interp,
-		    int returnCode));
-
-static int	OldMathFuncProc _ANSI_ARGS_((ClientData clientData,
-		    Tcl_Interp *interp, int argc, Tcl_Obj *CONST *objv));
-
-static void	OldMathFuncDeleteProc _ANSI_ARGS_((ClientData));
-
-static int	ExprAbsFunc _ANSI_ARGS_((ClientData clientData,
-		    Tcl_Interp *interp, int argc, Tcl_Obj *CONST *objv));
-static int	ExprBinaryFunc _ANSI_ARGS_((ClientData clientData,
-		    Tcl_Interp *interp, int argc, Tcl_Obj *CONST *objv));
-static int	ExprBoolFunc _ANSI_ARGS_((ClientData clientData,
-		    Tcl_Interp *interp, int argc, Tcl_Obj *CONST *objv));
-static int	ExprDoubleFunc _ANSI_ARGS_((ClientData clientData,
-		    Tcl_Interp *interp, int argc, Tcl_Obj *CONST *objv));
-static int	ExprIntFunc _ANSI_ARGS_((ClientData clientData,
-		    Tcl_Interp *interp, int argc, Tcl_Obj *CONST *objv));
-static int	ExprRandFunc _ANSI_ARGS_((ClientData clientData,
-		    Tcl_Interp *interp, int argc, Tcl_Obj *CONST *objv));
-static int	ExprRoundFunc _ANSI_ARGS_((ClientData clientData,
-		    Tcl_Interp *interp, int argc, Tcl_Obj *CONST *objv));
-static int	ExprSrandFunc _ANSI_ARGS_((ClientData clientData,
-		    Tcl_Interp *interp, int argc, Tcl_Obj *CONST *objv));
-static int	ExprUnaryFunc _ANSI_ARGS_((ClientData clientData,
-		    Tcl_Interp *interp, int argc, Tcl_Obj *CONST *objv));
-static int	ExprWideFunc  _ANSI_ARGS_((ClientData clientData,
-		    Tcl_Interp *interp, int argc, Tcl_Obj *CONST *objv));
-static int	VerifyExprObjType _ANSI_ARGS_((Tcl_Interp *interp,
-		    Tcl_Obj *objPtr));
-
-static void	MathFuncWrongNumArgs _ANSI_ARGS_((Tcl_Interp* interp,
-		    int expected, int actual, Tcl_Obj *CONST *objv));
+static char *	CallCommandTraces(Interp *iPtr, Command *cmdPtr,
+		    CONST char *oldName, CONST char* newName, int flags);
+static void	DeleteInterpProc(Tcl_Interp *interp);
+static void	ProcessUnexpectedResult(Tcl_Interp *interp, int returnCode);
+
+static int	OldMathFuncProc(ClientData clientData, Tcl_Interp *interp,
+		    int argc, Tcl_Obj *CONST *objv);
+
+static void	OldMathFuncDeleteProc(ClientData clientData);
+
+static int	ExprAbsFunc(ClientData clientData, Tcl_Interp *interp,
+		    int argc, Tcl_Obj *CONST *objv);
+static int	ExprBinaryFunc(ClientData clientData, Tcl_Interp *interp,
+		    int argc, Tcl_Obj *CONST *objv);
+static int	ExprBoolFunc(ClientData clientData, Tcl_Interp *interp,
+		    int argc, Tcl_Obj *CONST *objv);
+static int	ExprDoubleFunc(ClientData clientData, Tcl_Interp *interp,
+		    int argc, Tcl_Obj *CONST *objv);
+static int	ExprIntFunc(ClientData clientData, Tcl_Interp *interp,
+		    int argc, Tcl_Obj *CONST *objv);
+static int	ExprRandFunc(ClientData clientData, Tcl_Interp *interp,
+		    int argc, Tcl_Obj *CONST *objv);
+static int	ExprRoundFunc(ClientData clientData, Tcl_Interp *interp,
+		    int argc, Tcl_Obj *CONST *objv);
+static int	ExprSrandFunc(ClientData clientData, Tcl_Interp *interp,
+		    int argc, Tcl_Obj *CONST *objv);
+static int	ExprUnaryFunc(ClientData clientData, Tcl_Interp *interp,
+		    int argc, Tcl_Obj *CONST *objv);
+static int	ExprWideFunc(ClientData clientData, Tcl_Interp *interp,
+		    int argc, Tcl_Obj *CONST *objv);
+static int	VerifyExprObjType(Tcl_Interp *interp, Tcl_Obj *objPtr);
+
+static void	MathFuncWrongNumArgs(Tcl_Interp* interp, int expected,
+		    int actual, Tcl_Obj *CONST *objv);
 
 #ifndef TCL_WIDE_INT_IS_LONG
 /*
  * Extract a double value from a general numeric object.
  */
+
 #define GET_DOUBLE_VALUE(doubleVar, objPtr, typePtr)			\
     if ((typePtr) == &tclIntType) {					\
 	(doubleVar) = (double) (objPtr)->internalRep.longValue;		\
@@ -110,8 +109,8 @@ static void	MathFuncWrongNumArgs _ANSI_ARGS_((Tcl_Interp* interp,
 
 /*
  * Macros for testing floating-point values for certain special cases. Test
- * for not-a-number by comparing a value against itself; test for infinity
- * by comparing against the largest floating-point value.
+ * for not-a-number by comparing a value against itself; test for infinity by
+ * comparing against the largest floating-point value.
  */
 
 #ifdef _MSC_VER
@@ -132,9 +131,9 @@ typedef struct {
     char *name;			/* Name of object-based command. */
     Tcl_ObjCmdProc *objProc;	/* Object-based procedure for command. */
     CompileProc *compileProc;	/* Procedure called to compile command. */
-    int isSafe;			/* If non-zero, command will be present
-				 * in safe interpreter. Otherwise it will
-				 * be hidden. */
+    int isSafe;			/* If non-zero, command will be present in
+				 * safe interpreter. Otherwise it will be
+				 * hidden. */
 } CmdInfo;
 
 /*
@@ -143,7 +142,7 @@ typedef struct {
 
 static CmdInfo builtInCmds[] = {
     /*
-     * Commands in the generic core. 
+     * Commands in the generic core.
      */
 
     {"append",		Tcl_AppendObjCmd,	TclCompileAppendCmd,	1},
@@ -285,13 +284,12 @@ static BuiltinFuncDef BuiltinFuncTable[] = {
  *	Create a new TCL command interpreter.
  *
  * Results:
- *	The return value is a token for the interpreter, which may be
- *	used in calls to procedures like Tcl_CreateCmd, Tcl_Eval, or
- *	Tcl_DeleteInterp.
+ *	The return value is a token for the interpreter, which may be used in
+ *	calls to procedures like Tcl_CreateCmd, Tcl_Eval, or Tcl_DeleteInterp.
  *
  * Side effects:
- *	The command interpreter is initialized with the built-in commands
- *	and with the variables documented in tclvars(n).
+ *	The command interpreter is initialized with the built-in commands and
+ *	with the variables documented in tclvars(n).
  *
  *----------------------------------------------------------------------
  */
@@ -317,9 +315,9 @@ Tcl_CreateInterp()
     TclInitSubsystems();
 
     /*
-     * Panic if someone updated the CallFrame structure without
-     * also updating the Tcl_CallFrame structure (or vice versa).
-     */  
+     * Panic if someone updated the CallFrame structure without also updating
+     * the Tcl_CallFrame structure (or vice versa).
+     */
 
     if (sizeof(Tcl_CallFrame) != sizeof(CallFrame)) {
 	/*NOTREACHED*/
@@ -328,8 +326,8 @@ Tcl_CreateInterp()
 
     /*
      * Initialize support for namespaces and create the global namespace
-     * (whose name is ""; an alias is "::"). This also initializes the
-     * Tcl object type table and other object management code.
+     * (whose name is ""; an alias is "::"). This also initializes the Tcl
+     * object type table and other object management code.
      */
 
     iPtr = (Interp *) ckalloc(sizeof(Interp));
@@ -385,7 +383,7 @@ Tcl_CreateInterp()
     Tcl_IncrRefCount(iPtr->emptyObjPtr);
     iPtr->resultSpace[0] = 0;
 
-    iPtr->globalNsPtr = NULL;	/* force creation of global ns below */
+    iPtr->globalNsPtr = NULL;		/* force creation of global ns below */
     iPtr->globalNsPtr = (Namespace *) Tcl_CreateNamespace(interp, "",
 	    (ClientData) NULL, (Tcl_NamespaceDeleteProc *) NULL);
     if (iPtr->globalNsPtr == NULL) {
@@ -401,7 +399,10 @@ Tcl_CreateInterp()
 
     iPtr->execEnvPtr = TclCreateExecEnv(interp);
 
-    /* TIP #219, Tcl Channel Reflection API */
+    /*
+     * TIP #219, Tcl Channel Reflection API support.
+     */
+
     iPtr->chanMsg  = NULL;
 
     /*
@@ -437,7 +438,7 @@ Tcl_CreateInterp()
     statsPtr->totalLitStringBytes   = 0.0;
     statsPtr->currentLitStringBytes = 0.0;
     (VOID *) memset(statsPtr->literalCount, 0, sizeof(statsPtr->literalCount));
-#endif /* TCL_COMPILE_STATS */    
+#endif /* TCL_COMPILE_STATS */
 
     /*
      * Initialise the stub table pointer.
@@ -461,13 +462,13 @@ Tcl_CreateInterp()
 
     /*
      * Create the core commands. Do it here, rather than calling
-     * Tcl_CreateCommand, because it's faster (there's no need to check for
-     * a pre-existing command by the same name). If a command has a
-     * Tcl_CmdProc but no Tcl_ObjCmdProc, set the Tcl_ObjCmdProc to
-     * TclInvokeStringCommand. This is an object-based wrapper procedure
-     * that extracts strings, calls the string procedure, and creates an
-     * object for the result. Similarly, if a command has a Tcl_ObjCmdProc
-     * but no Tcl_CmdProc, set the Tcl_CmdProc to TclInvokeObjectCommand.
+     * Tcl_CreateCommand, because it's faster (there's no need to check for a
+     * pre-existing command by the same name). If a command has a Tcl_CmdProc
+     * but no Tcl_ObjCmdProc, set the Tcl_ObjCmdProc to
+     * TclInvokeStringCommand. This is an object-based wrapper procedure that
+     * extracts strings, calls the string procedure, and creates an object for
+     * the result. Similarly, if a command has a Tcl_ObjCmdProc but no
+     * Tcl_CmdProc, set the Tcl_CmdProc to TclInvokeObjectCommand.
      */
 
     for (cmdInfoPtr = builtInCmds;  cmdInfoPtr->name != NULL; cmdInfoPtr++) {
@@ -502,7 +503,7 @@ Tcl_CreateInterp()
     }
 
     /*
-     * Register the clock commands.  These *do* go through 
+     * Register clock and chan subcommands. These *do* go through
      * Tcl_CreateObjCommand, since they aren't in the global namespace.
      */
 
@@ -548,13 +549,18 @@ Tcl_CreateInterp()
      */
 
 
-    /* Register the default [interp bgerror] handler. */
+    /*
+     * Register the default [interp bgerror] handler.
+     */
 
     Tcl_CreateObjCommand(interp,	"::tcl::Bgerror",
 	    TclDefaultBgErrorHandlerObjCmd,	(ClientData) NULL,
 	    (Tcl_CmdDeleteProc*) NULL);
 
-    /* Register the unsupported encoding search path command */
+    /*
+     * Register the unsupported encoding search path command.
+     */
+
     Tcl_CreateObjCommand(interp, "::tcl::unsupported::EncodingDirs",
 	    TclEncodingDirsObjCmd, NULL, NULL);
 
@@ -623,15 +629,14 @@ Tcl_CreateInterp()
 
 #ifdef TCL_THREADS
     /*
-     * The existence of the "threaded" element of the tcl_platform array indicates
-     * that this particular Tcl shell has been compiled with threads turned on.
-     * Using "info exists tcl_platform(threaded)" a Tcl script can introspect on the 
-     * interpreter level of thread safety.
+     * The existence of the "threaded" element of the tcl_platform array
+     * indicates that this particular Tcl shell has been compiled with threads
+     * turned on. Using "info exists tcl_platform(threaded)" a Tcl script can
+     * introspect on the interpreter level of thread safety.
      */
 
 
-    Tcl_SetVar2(interp, "tcl_platform", "threaded", "1",
-	    TCL_GLOBAL_ONLY);
+    Tcl_SetVar2(interp, "tcl_platform", "threaded", "1", TCL_GLOBAL_ONLY);
 #endif
 
     /*
@@ -653,8 +658,7 @@ Tcl_CreateInterp()
  *
  * TclHideUnsafeCommands --
  *
- *	Hides base commands that are not marked as safe from this
- *	interpreter.
+ *	Hides base commands that are not marked as safe from this interpreter.
  *
  * Results:
  *	TCL_OK if it succeeds, TCL_ERROR else.
@@ -687,20 +691,18 @@ TclHideUnsafeCommands(interp)
  *
  * Tcl_CallWhenDeleted --
  *
- *	Arrange for a procedure to be called before a given
- *	interpreter is deleted. The procedure is called as soon
- *	as Tcl_DeleteInterp is called; if Tcl_CallWhenDeleted is
- *	called on an interpreter that has already been deleted,
- *	the procedure will be called when the last Tcl_Release is
- *	done on the interpreter.
+ *	Arrange for a procedure to be called before a given interpreter is
+ *	deleted. The procedure is called as soon as Tcl_DeleteInterp is
+ *	called; if Tcl_CallWhenDeleted is called on an interpreter that has
+ *	already been deleted, the procedure will be called when the last
+ *	Tcl_Release is done on the interpreter.
  *
  * Results:
  *	None.
  *
  * Side effects:
- *	When Tcl_DeleteInterp is invoked to delete interp,
- *	proc will be invoked.  See the manual entry for
- *	details.
+ *	When Tcl_DeleteInterp is invoked to delete interp, proc will be
+ *	invoked. See the manual entry for details.
  *
  *--------------------------------------------------------------
  */
@@ -708,8 +710,8 @@ TclHideUnsafeCommands(interp)
 void
 Tcl_CallWhenDeleted(interp, proc, clientData)
     Tcl_Interp *interp;		/* Interpreter to watch. */
-    Tcl_InterpDeleteProc *proc;	/* Procedure to call when interpreter
-				 * is about to be deleted. */
+    Tcl_InterpDeleteProc *proc;	/* Procedure to call when interpreter is about
+				 * to be deleted. */
     ClientData clientData;	/* One-word value to pass to proc. */
 {
     Interp *iPtr = (Interp *) interp;
@@ -739,17 +741,16 @@ Tcl_CallWhenDeleted(interp, proc, clientData)
  *
  * Tcl_DontCallWhenDeleted --
  *
- *	Cancel the arrangement for a procedure to be called when
- *	a given interpreter is deleted.
+ *	Cancel the arrangement for a procedure to be called when a given
+ *	interpreter is deleted.
  *
  * Results:
  *	None.
  *
  * Side effects:
- *	If proc and clientData were previously registered as a
- *	callback via Tcl_CallWhenDeleted, they are unregistered.
- *	If they weren't previously registered then nothing
- *	happens.
+ *	If proc and clientData were previously registered as a callback via
+ *	Tcl_CallWhenDeleted, they are unregistered. If they weren't previously
+ *	registered then nothing happens.
  *
  *--------------------------------------------------------------
  */
@@ -757,8 +758,8 @@ Tcl_CallWhenDeleted(interp, proc, clientData)
 void
 Tcl_DontCallWhenDeleted(interp, proc, clientData)
     Tcl_Interp *interp;		/* Interpreter to watch. */
-    Tcl_InterpDeleteProc *proc;	/* Procedure to call when interpreter
-				 * is about to be deleted. */
+    Tcl_InterpDeleteProc *proc;	/* Procedure to call when interpreter is about
+				 * to be deleted. */
     ClientData clientData;	/* One-word value to pass to proc. */
 {
     Interp *iPtr = (Interp *) interp;
@@ -788,9 +789,9 @@ Tcl_DontCallWhenDeleted(interp, proc, clientData)
  * Tcl_SetAssocData --
  *
  *	Creates a named association between user-specified data, a delete
- *	function and this interpreter. If the association already exists
- *	the data is overwritten with the new data. The delete function will
- *	be invoked when the interpreter is deleted.
+ *	function and this interpreter. If the association already exists the
+ *	data is overwritten with the new data. The delete function will be
+ *	invoked when the interpreter is deleted.
  *
  * Results:
  *	None.
@@ -805,8 +806,8 @@ void
 Tcl_SetAssocData(interp, name, proc, clientData)
     Tcl_Interp *interp;		/* Interpreter to associate with. */
     CONST char *name;		/* Name for association. */
-    Tcl_InterpDeleteProc *proc;	/* Proc to call when interpreter is
-				 * about to be deleted. */
+    Tcl_InterpDeleteProc *proc;	/* Proc to call when interpreter is about to
+				 * be deleted. */
     ClientData clientData;	/* One-word value to pass to proc. */
 {
     Interp *iPtr = (Interp *) interp;
@@ -835,8 +836,8 @@ Tcl_SetAssocData(interp, name, proc, clientData)
  *
  * Tcl_DeleteAssocData --
  *
- *	Deletes a named association of user-specified data with
- *	the specified interpreter.
+ *	Deletes a named association of user-specified data with the specified
+ *	interpreter.
  *
  * Results:
  *	None.
@@ -849,8 +850,8 @@ Tcl_SetAssocData(interp, name, proc, clientData)
 
 void
 Tcl_DeleteAssocData(interp, name)
-    Tcl_Interp *interp;			/* Interpreter to associate with. */
-    CONST char *name;			/* Name of association. */
+    Tcl_Interp *interp;		/* Interpreter to associate with. */
+    CONST char *name;		/* Name of association. */
 {
     Interp *iPtr = (Interp *) interp;
     AssocData *dPtr;
@@ -876,8 +877,8 @@ Tcl_DeleteAssocData(interp, name)
  *
  * Tcl_GetAssocData --
  *
- *	Returns the client data associated with this name in the
- *	specified interpreter.
+ *	Returns the client data associated with this name in the specified
+ *	interpreter.
  *
  * Results:
  *	The client data in the AssocData record denoted by the named
@@ -891,10 +892,11 @@ Tcl_DeleteAssocData(interp, name)
 
 ClientData
 Tcl_GetAssocData(interp, name, procPtr)
-    Tcl_Interp *interp;			/* Interpreter associated with. */
-    CONST char *name;			/* Name of association. */
-    Tcl_InterpDeleteProc **procPtr;	/* Pointer to place to store address
-					 * of current deletion callback. */
+    Tcl_Interp *interp;		/* Interpreter associated with. */
+    CONST char *name;		/* Name of association. */
+    Tcl_InterpDeleteProc **procPtr;
+				/* Pointer to place to store address of
+				 * current deletion callback. */
 {
     Interp *iPtr = (Interp *) interp;
     AssocData *dPtr;
@@ -919,8 +921,8 @@ Tcl_GetAssocData(interp, name, procPtr)
  *
  * Tcl_InterpDeleted --
  *
- *	Returns nonzero if the interpreter has been deleted with a call
- *	to Tcl_DeleteInterp.
+ *	Returns nonzero if the interpreter has been deleted with a call to
+ *	Tcl_DeleteInterp.
  *
  * Results:
  *	Nonzero if the interpreter is deleted, zero otherwise.
@@ -943,11 +945,11 @@ Tcl_InterpDeleted(interp)
  *
  * Tcl_DeleteInterp --
  *
- *	Ensures that the interpreter will be deleted eventually. If there
- *	are no Tcl_Preserve calls in effect for this interpreter, it is
- *	deleted immediately, otherwise the interpreter is deleted when
- *	the last Tcl_Preserve is matched by a call to Tcl_Release. In either
- *	case, the procedure runs the currently registered deletion callbacks. 
+ *	Ensures that the interpreter will be deleted eventually. If there are
+ *	no Tcl_Preserve calls in effect for this interpreter, it is deleted
+ *	immediately, otherwise the interpreter is deleted when the last
+ *	Tcl_Preserve is matched by a call to Tcl_Release. In either case, the
+ *	procedure runs the currently registered deletion callbacks.
  *
  * Results:
  *	None.
@@ -963,8 +965,8 @@ Tcl_InterpDeleted(interp)
 
 void
 Tcl_DeleteInterp(interp)
-    Tcl_Interp *interp;		/* Token for command interpreter (returned
-				 * by a previous call to Tcl_CreateInterp). */
+    Tcl_Interp *interp;		/* Token for command interpreter (returned by
+				 * a previous call to Tcl_CreateInterp). */
 {
     Interp *iPtr = (Interp *) interp;
 
@@ -984,8 +986,8 @@ Tcl_DeleteInterp(interp)
     iPtr->flags |= DELETED;
     iPtr->compileEpoch++;
 
-    /* TIP #219, Tcl Channel Reflection API.
-     * Discard a leftover state.
+    /*
+     * TIP #219, Tcl Channel Reflection API. Discard a leftover state.
      */
 
     if (iPtr->chanMsg != NULL) {
@@ -1005,25 +1007,25 @@ Tcl_DeleteInterp(interp)
  *
  * DeleteInterpProc --
  *
- *	Helper procedure to delete an interpreter. This procedure is
- *	called when the last call to Tcl_Preserve on this interpreter
- *	is matched by a call to Tcl_Release. The procedure cleans up
- *	all resources used in the interpreter and calls all currently
- *	registered interpreter deletion callbacks.
+ *	Helper procedure to delete an interpreter. This procedure is called
+ *	when the last call to Tcl_Preserve on this interpreter is matched by a
+ *	call to Tcl_Release. The procedure cleans up all resources used in the
+ *	interpreter and calls all currently registered interpreter deletion
+ *	callbacks.
  *
  * Results:
  *	None.
  *
  * Side effects:
- *	Whatever the interpreter deletion callbacks do. Frees resources
- *	used by the interpreter.
+ *	Whatever the interpreter deletion callbacks do. Frees resources used
+ *	by the interpreter.
  *
  *----------------------------------------------------------------------
  */
 
 static void
 DeleteInterpProc(interp)
-    Tcl_Interp *interp;			/* Interpreter to delete. */
+    Tcl_Interp *interp;		/* Interpreter to delete. */
 {
     Interp *iPtr = (Interp *) interp;
     Tcl_HashEntry *hPtr;
@@ -1040,8 +1042,8 @@ DeleteInterpProc(interp)
     }
 
     /*
-     * The interpreter should already be marked deleted; otherwise how
-     * did we get here?
+     * The interpreter should already be marked deleted; otherwise how did we
+     * get here?
      */
 
     if (!(iPtr->flags & DELETED)) {
@@ -1049,9 +1051,8 @@ DeleteInterpProc(interp)
     }
 
     /*
-     * Shut down all limit handler callback scripts that call back
-     * into this interpreter.  Then eliminate all limit handlers for
-     * this interpreter.
+     * Shut down all limit handler callback scripts that call back into this
+     * interpreter. Then eliminate all limit handlers for this interpreter.
      */
 
     TclRemoveScriptLimitCallbacks(interp);
@@ -1077,8 +1078,8 @@ DeleteInterpProc(interp)
     hTablePtr = iPtr->hiddenCmdTablePtr;
     if (hTablePtr != NULL) {
 	/*
-	 * Non-pernicious deletion.  The deletion callbacks will not be
-	 * allowed to create any new hidden or non-hidden commands.
+	 * Non-pernicious deletion. The deletion callbacks will not be allowed
+	 * to create any new hidden or non-hidden commands.
 	 * Tcl_DeleteCommandFromToken() will remove the entry from the
 	 * hiddenCmdTablePtr.
 	 */
@@ -1123,9 +1124,8 @@ DeleteInterpProc(interp)
     Tcl_DeleteNamespace((Tcl_Namespace *) iPtr->globalNsPtr);
 
     /*
-     * Free up the result *after* deleting variables, since variable
-     * deletion could have transferred ownership of the result string
-     * to Tcl.
+     * Free up the result *after* deleting variables, since variable deletion
+     * could have transferred ownership of the result string to Tcl.
      */
 
     Tcl_FreeResult(interp);
@@ -1181,16 +1181,16 @@ DeleteInterpProc(interp)
  *
  * Tcl_HideCommand --
  *
- *	Makes a command hidden so that it cannot be invoked from within
- *	an interpreter, only from within an ancestor.
+ *	Makes a command hidden so that it cannot be invoked from within an
+ *	interpreter, only from within an ancestor.
  *
  * Results:
- *	A standard Tcl result; also leaves a message in the interp's result
- *	if an error occurs.
+ *	A standard Tcl result; also leaves a message in the interp's result if
+ *	an error occurs.
  *
  * Side effects:
- *	Removes a command from the command table and create an entry
- *	into the hidden command table under the specified token name.
+ *	Removes a command from the command table and create an entry into the
+ *	hidden command table under the specified token name.
  *
  *---------------------------------------------------------------------------
  */
@@ -1211,8 +1211,8 @@ Tcl_HideCommand(interp, cmdName, hiddenCmdToken)
     if (iPtr->flags & DELETED) {
 
 	/*
-	 * The interpreter is being deleted. Do not create any new
-	 * structures, because it is not safe to modify the interpreter.
+	 * The interpreter is being deleted. Do not create any new structures,
+	 * because it is not safe to modify the interpreter.
 	 */
 
 	return TCL_ERROR;
@@ -1220,13 +1220,12 @@ Tcl_HideCommand(interp, cmdName, hiddenCmdToken)
 
     /*
      * Disallow hiding of commands that are currently in a namespace or
-     * renaming (as part of hiding) into a namespace.
-     *
-     * (because the current implementation with a single global table
-     *  and the needed uniqueness of names cause problems with namespaces)
+     * renaming (as part of hiding) into a namespace (because the current
+     * implementation with a single global table and the needed uniqueness of
+     * names cause problems with namespaces).
      *
-     * we don't need to check for "::" in cmdName because the real check is
-     * on the nsPtr below.
+     * We don't need to check for "::" in cmdName because the real check is on
+     * the nsPtr below.
      *
      * hiddenCmdToken is just a string which is not interpreted in any way.
      * It may contain :: but the string is not interpreted as a namespace
@@ -1235,9 +1234,9 @@ Tcl_HideCommand(interp, cmdName, hiddenCmdToken)
      * application always uses the same strings it will get consistent
      * behaviour.
      *
-     * But as we currently limit ourselves to the global namespace only
-     * for the source, in order to avoid potential confusion,
-     * lets prevent "::" in the token too.  --dl
+     * But as we currently limit ourselves to the global namespace only for
+     * the source, in order to avoid potential confusion, lets prevent "::" in
+     * the token too. - dl
      */
 
     if (strstr(hiddenCmdToken, "::") != NULL) {
@@ -1248,9 +1247,9 @@ Tcl_HideCommand(interp, cmdName, hiddenCmdToken)
     }
 
     /*
-     * Find the command to hide. An error is returned if cmdName can't
-     * be found. Look up the command only from the global namespace.
-     * Full path of the command must be given if using namespaces.
+     * Find the command to hide. An error is returned if cmdName can't be
+     * found. Look up the command only from the global namespace. Full path of
+     * the command must be given if using namespaces.
      */
 
     cmd = Tcl_FindCommand(interp, cmdName, (Tcl_Namespace *) NULL,
@@ -1297,9 +1296,8 @@ Tcl_HideCommand(interp, cmdName, hiddenCmdToken)
 
     /*
      * Nb : This code is currently 'like' a rename to a specialy set apart
-     * name table. Changes here and in TclRenameCommand must
-     * be kept in synch untill the common parts are actually
-     * factorized out.
+     * name table. Changes here and in TclRenameCommand must be kept in synch
+     * untill the common parts are actually factorized out.
      */
 
     /*
@@ -1315,16 +1313,16 @@ Tcl_HideCommand(interp, cmdName, hiddenCmdToken)
     }
 
     /*
-     * The list of command exported from the namespace might have
-     * changed.  However, we do not need to recompute this just yet;
-     * next time we need the info will be soon enough.
+     * The list of command exported from the namespace might have changed.
+     * However, we do not need to recompute this just yet; next time we need
+     * the info will be soon enough.
      */
 
     TclInvalidateNsCmdLookup(cmdPtr->nsPtr);
 
     /*
-     * Now link the hash table entry with the command structure.
-     * We ensured above that the nsPtr was right.
+     * Now link the hash table entry with the command structure. We ensured
+     * above that the nsPtr was right.
      */
 
     cmdPtr->hPtr = hPtr;
@@ -1332,11 +1330,11 @@ Tcl_HideCommand(interp, cmdName, hiddenCmdToken)
 
     /*
      * If the command being hidden has a compile procedure, increment the
-     * interpreter's compileEpoch to invalidate its compiled code. This
-     * makes sure that we don't later try to execute old code compiled with
-     * command-specific (i.e., inline) bytecodes for the now-hidden
-     * command. This field is checked in Tcl_EvalObj and ObjInterpProc,
-     * and code whose compilation epoch doesn't match is recompiled.
+     * interpreter's compileEpoch to invalidate its compiled code. This makes
+     * sure that we don't later try to execute old code compiled with
+     * command-specific (i.e., inline) bytecodes for the now-hidden command.
+     * This field is checked in Tcl_EvalObj and ObjInterpProc, and code whose
+     * compilation epoch doesn't match is recompiled.
      */
 
     if (cmdPtr->compileProc != NULL) {
@@ -1350,12 +1348,12 @@ Tcl_HideCommand(interp, cmdName, hiddenCmdToken)
  *
  * Tcl_ExposeCommand --
  *
- *	Makes a previously hidden command callable from inside the
- *	interpreter instead of only by its ancestors.
+ *	Makes a previously hidden command callable from inside the interpreter
+ *	instead of only by its ancestors.
  *
  * Results:
- *	A standard Tcl result. If an error occurs, a message is left
- *	in the interp's result.
+ *	A standard Tcl result. If an error occurs, a message is left in the
+ *	interp's result.
  *
  * Side effects:
  *	Moves commands from one hash table to another.
@@ -1379,17 +1377,17 @@ Tcl_ExposeCommand(interp, hiddenCmdToken, cmdName)
 
     if (iPtr->flags & DELETED) {
 	/*
-	 * The interpreter is being deleted. Do not create any new
-	 * structures, because it is not safe to modify the interpreter.
+	 * The interpreter is being deleted. Do not create any new structures,
+	 * because it is not safe to modify the interpreter.
 	 */
 
 	return TCL_ERROR;
     }
 
     /*
-     * Check that we have a regular name for the command
-     * (that the user is not trying to do an expose and a rename
-     *  (to another namespace) at the same time)
+     * Check that we have a regular name for the command (that the user is not
+     * trying to do an expose and a rename (to another namespace) at the same
+     * time).
      */
 
     if (strstr(cmdName, "::") != NULL) {
@@ -1415,16 +1413,17 @@ Tcl_ExposeCommand(interp, hiddenCmdToken, cmdName)
     cmdPtr = (Command *) Tcl_GetHashValue(hPtr);
 
     /*
-     * Check that we have a true global namespace
-     * command (enforced by Tcl_HideCommand() but let's double
-     * check. (If it was not, we would not really know how to
-     * handle it).
+     * Check that we have a true global namespace command (enforced by
+     * Tcl_HideCommand() but let's double check. (If it was not, we would not
+     * really know how to handle it).
      */
+
     if (cmdPtr->nsPtr != iPtr->globalNsPtr) {
-	/* 
-	 * This case is theoritically impossible,
-	 * we might rather Tcl_Panic() than 'nicely' erroring out ?
+	/*
+	 * This case is theoritically impossible, we might rather Tcl_Panic()
+	 * than 'nicely' erroring out ?
 	 */
+
 	Tcl_AppendResult(interp,
 		"trying to expose a non global command name space command",
 		(char *) NULL);
@@ -1435,8 +1434,8 @@ Tcl_ExposeCommand(interp, hiddenCmdToken, cmdName)
     nsPtr = cmdPtr->nsPtr;
 
     /*
-     * It is an error to overwrite an existing exposed command as a result
-     * of exposing a previously hidden command.
+     * It is an error to overwrite an existing exposed command as a result of
+     * exposing a previously hidden command.
      */
 
     hPtr = Tcl_CreateHashEntry(&nsPtr->cmdTable, cmdName, &new);
@@ -1447,9 +1446,9 @@ Tcl_ExposeCommand(interp, hiddenCmdToken, cmdName)
     }
 
     /*
-     * The list of command exported from the namespace might have
-     * changed.  However, we do not need to recompute this just yet;
-     * next time we need the info will be soon enough.
+     * The list of command exported from the namespace might have changed.
+     * However, we do not need to recompute this just yet; next time we need
+     * the info will be soon enough.
      */
 
     TclInvalidateNsCmdLookup(nsPtr);
@@ -1465,9 +1464,9 @@ Tcl_ExposeCommand(interp, hiddenCmdToken, cmdName)
     }
 
     /*
-     * Now link the hash table entry with the command structure.
-     * This is like creating a new command, so deal with any shadowing
-     * of commands in the global namespace.
+     * Now link the hash table entry with the command structure. This is like
+     * creating a new command, so deal with any shadowing of commands in the
+     * global namespace.
      */
 
     cmdPtr->hPtr = hPtr;
@@ -1475,18 +1474,18 @@ Tcl_ExposeCommand(interp, hiddenCmdToken, cmdName)
     Tcl_SetHashValue(hPtr, (ClientData) cmdPtr);
 
     /*
-     * Not needed as we are only in the global namespace
-     * (but would be needed again if we supported namespace command hiding)
+     * Not needed as we are only in the global namespace (but would be needed
+     * again if we supported namespace command hiding)
      *
      * TclResetShadowedCmdRefs(interp, cmdPtr);
      */
 
     /*
      * If the command being exposed has a compile procedure, increment
-     * interpreter's compileEpoch to invalidate its compiled code. This
-     * makes sure that we don't later try to execute old code compiled
-     * assuming the command is hidden. This field is checked in Tcl_EvalObj
-     * and ObjInterpProc, and code whose compilation epoch doesn't match is
+     * interpreter's compileEpoch to invalidate its compiled code. This makes
+     * sure that we don't later try to execute old code compiled assuming the
+     * command is hidden. This field is checked in Tcl_EvalObj and
+     * ObjInterpProc, and code whose compilation epoch doesn't match is
      * recompiled.
      */
 
@@ -1504,34 +1503,34 @@ Tcl_ExposeCommand(interp, hiddenCmdToken, cmdName)
  *	Define a new command in a command table.
  *
  * Results:
- *	The return value is a token for the command, which can
- *	be used in future calls to Tcl_GetCommandName.
+ *	The return value is a token for the command, which can be used in
+ *	future calls to Tcl_GetCommandName.
  *
  * Side effects:
  *	If a command named cmdName already exists for interp, it is deleted.
  *	In the future, when cmdName is seen as the name of a command by
  *	Tcl_Eval, proc will be called. To support the bytecode interpreter,
  *	the command is created with a wrapper Tcl_ObjCmdProc
- *	(TclInvokeStringCommand) that eventially calls proc. When the
- *	command is deleted from the table, deleteProc will be called.
- *	See the manual entry for details on the calling sequence.
+ *	(TclInvokeStringCommand) that eventially calls proc. When the command
+ *	is deleted from the table, deleteProc will be called.  See the manual
+ *	entry for details on the calling sequence.
  *
  *----------------------------------------------------------------------
  */
 
 Tcl_Command
 Tcl_CreateCommand(interp, cmdName, proc, clientData, deleteProc)
-    Tcl_Interp *interp;		/* Token for command interpreter returned by
-				 * a previous call to Tcl_CreateInterp. */
+    Tcl_Interp *interp;		/* Token for command interpreter returned by a
+				 * previous call to Tcl_CreateInterp. */
     CONST char *cmdName;	/* Name of command. If it contains namespace
 				 * qualifiers, the new command is put in the
-				 * specified namespace; otherwise it is put
-				 * in the global namespace. */
+				 * specified namespace; otherwise it is put in
+				 * the global namespace. */
     Tcl_CmdProc *proc;		/* Procedure to associate with cmdName. */
     ClientData clientData;	/* Arbitrary value passed to string proc. */
     Tcl_CmdDeleteProc *deleteProc;
-				/* If not NULL, gives a procedure to call
-				 * when this command is deleted. */
+				/* If not NULL, gives a procedure to call when
+				 * this command is deleted. */
 {
     Interp *iPtr = (Interp *) interp;
     ImportRef *oldRefPtr = NULL;
@@ -1544,17 +1543,17 @@ Tcl_CreateCommand(interp, cmdName, proc, clientData, deleteProc)
 
     if (iPtr->flags & DELETED) {
 	/*
-	 * The interpreter is being deleted.  Don't create any new
-	 * commands; it's not safe to muck with the interpreter anymore.
+	 * The interpreter is being deleted. Don't create any new commands;
+	 * it's not safe to muck with the interpreter anymore.
 	 */
 
 	return (Tcl_Command) NULL;
     }
 
     /*
-     * Determine where the command should reside. If its name contains 
-     * namespace qualifiers, we put it in the specified namespace; 
-     * otherwise, we always put it in the global namespace.
+     * Determine where the command should reside. If its name contains
+     * namespace qualifiers, we put it in the specified namespace; otherwise,
+     * we always put it in the global namespace.
      */
 
     if (strstr(cmdName, "::") != NULL) {
@@ -1571,10 +1570,10 @@ Tcl_CreateCommand(interp, cmdName, proc, clientData, deleteProc)
     hPtr = Tcl_CreateHashEntry(&nsPtr->cmdTable, tail, &new);
     if (!new) {
 	/*
-	 * Command already exists. Delete the old one.
-	 * Be careful to preserve any existing import links so we can
-	 * restore them down below.  That way, you can redefine a
-	 * command and its import status will remain intact.
+	 * Command already exists. Delete the old one. Be careful to preserve
+	 * any existing import links so we can restore them down below. That
+	 * way, you can redefine a command and its import status will remain
+	 * intact.
 	 */
 
 	cmdPtr = (Command *) Tcl_GetHashValue(hPtr);
@@ -1585,18 +1584,18 @@ Tcl_CreateCommand(interp, cmdName, proc, clientData, deleteProc)
 	hPtr = Tcl_CreateHashEntry(&nsPtr->cmdTable, tail, &new);
 	if (!new) {
 	    /*
-	     * If the deletion callback recreated the command, just throw
-	     * away the new command (if we try to delete it again, we
-	     * could get stuck in an infinite loop).
+	     * If the deletion callback recreated the command, just throw away
+	     * the new command (if we try to delete it again, we could get
+	     * stuck in an infinite loop).
 	     */
 
 	     ckfree((char*) Tcl_GetHashValue(hPtr));
 	}
     } else {
 	/*
-	 * The list of command exported from the namespace might have
-	 * changed.  However, we do not need to recompute this just
-	 * yet; next time we need the info will be soon enough.
+	 * The list of command exported from the namespace might have changed.
+	 * However, we do not need to recompute this just yet; next time we
+	 * need the info will be soon enough.
 	 */
 
 	TclInvalidateNsCmdLookup(nsPtr);
@@ -1620,8 +1619,8 @@ Tcl_CreateCommand(interp, cmdName, proc, clientData, deleteProc)
     cmdPtr->tracePtr = NULL;
 
     /*
-     * Plug in any existing import references found above.  Be sure
-     * to update all of these references to point to the new command.
+     * Plug in any existing import references found above. Be sure to update
+     * all of these references to point to the new command.
      */
 
     if (oldRefPtr != NULL) {
@@ -1653,41 +1652,41 @@ Tcl_CreateCommand(interp, cmdName, proc, clientData, deleteProc)
  *	Define a new object-based command in a command table.
  *
  * Results:
- *	The return value is a token for the command, which can
- *	be used in future calls to Tcl_GetCommandName.
+ *	The return value is a token for the command, which can be used in
+ *	future calls to Tcl_GetCommandName.
  *
  * Side effects:
  *	If no command named "cmdName" already exists for interp, one is
- *	created. Otherwise, if a command does exist, then if the
- *	object-based Tcl_ObjCmdProc is TclInvokeStringCommand, we assume
- *	Tcl_CreateCommand was called previously for the same command and
- *	just set its Tcl_ObjCmdProc to the argument "proc"; otherwise, we
- *	delete the old command.
+ *	created. Otherwise, if a command does exist, then if the object-based
+ *	Tcl_ObjCmdProc is TclInvokeStringCommand, we assume Tcl_CreateCommand
+ *	was called previously for the same command and just set its
+ *	Tcl_ObjCmdProc to the argument "proc"; otherwise, we delete the old
+ *	command.
  *
  *	In the future, during bytecode evaluation when "cmdName" is seen as
  *	the name of a command by Tcl_EvalObj or Tcl_Eval, the object-based
  *	Tcl_ObjCmdProc proc will be called. When the command is deleted from
- *	the table, deleteProc will be called. See the manual entry for
- *	details on the calling sequence.
+ *	the table, deleteProc will be called. See the manual entry for details
+ *	on the calling sequence.
  *
  *----------------------------------------------------------------------
  */
 
 Tcl_Command
 Tcl_CreateObjCommand(interp, cmdName, proc, clientData, deleteProc)
-    Tcl_Interp *interp;		/* Token for command interpreter (returned
-				 * by previous call to Tcl_CreateInterp). */
+    Tcl_Interp *interp;		/* Token for command interpreter (returned by
+				 * previous call to Tcl_CreateInterp). */
     CONST char *cmdName;	/* Name of command. If it contains namespace
 				 * qualifiers, the new command is put in the
-				 * specified namespace; otherwise it is put
-				 * in the global namespace. */
+				 * specified namespace; otherwise it is put in
+				 * the global namespace. */
     Tcl_ObjCmdProc *proc;	/* Object-based procedure to associate with
 				 * name. */
     ClientData clientData;	/* Arbitrary value to pass to object
     				 * procedure. */
     Tcl_CmdDeleteProc *deleteProc;
-				/* If not NULL, gives a procedure to call
-				 * when this command is deleted. */
+				/* If not NULL, gives a procedure to call when
+				 * this command is deleted. */
 {
     Interp *iPtr = (Interp *) interp;
     ImportRef *oldRefPtr = NULL;
@@ -1700,17 +1699,17 @@ Tcl_CreateObjCommand(interp, cmdName, proc, clientData, deleteProc)
 
     if (iPtr->flags & DELETED) {
 	/*
-	 * The interpreter is being deleted.  Don't create any new
-	 * commands;  it's not safe to muck with the interpreter anymore.
+	 * The interpreter is being deleted. Don't create any new commands;
+	 * it's not safe to muck with the interpreter anymore.
 	 */
 
 	return (Tcl_Command) NULL;
     }
 
     /*
-     * Determine where the command should reside. If its name contains 
-     * namespace qualifiers, we put it in the specified namespace; 
-     * otherwise, we always put it in the global namespace.
+     * Determine where the command should reside. If its name contains
+     * namespace qualifiers, we put it in the specified namespace; otherwise,
+     * we always put it in the global namespace.
      */
 
     if (strstr(cmdName, "::") != NULL) {
@@ -1732,7 +1731,7 @@ Tcl_CreateObjCommand(interp, cmdName, proc, clientData, deleteProc)
 	/*
 	 * Command already exists. If its object-based Tcl_ObjCmdProc is
 	 * TclInvokeStringCommand, we just set its Tcl_ObjCmdProc to the
-	 * argument "proc". Otherwise, we delete the old command. 
+	 * argument "proc". Otherwise, we delete the old command.
 	 */
 
 	if (cmdPtr->objProc == TclInvokeStringCommand) {
@@ -1744,10 +1743,10 @@ Tcl_CreateObjCommand(interp, cmdName, proc, clientData, deleteProc)
 	}
 
 	/*
-	 * Otherwise, we delete the old command.  Be careful to preserve
-	 * any existing import links so we can restore them down below.
-	 * That way, you can redefine a command and its import status
-	 * will remain intact.
+	 * Otherwise, we delete the old command. Be careful to preserve any
+	 * existing import links so we can restore them down below. That way,
+	 * you can redefine a command and its import status will remain
+	 * intact.
 	 */
 
 	oldRefPtr = cmdPtr->importRefPtr;
@@ -1757,18 +1756,18 @@ Tcl_CreateObjCommand(interp, cmdName, proc, clientData, deleteProc)
 	hPtr = Tcl_CreateHashEntry(&nsPtr->cmdTable, tail, &new);
 	if (!new) {
 	    /*
-	     * If the deletion callback recreated the command, just throw
-	     * away the new command (if we try to delete it again, we
-	     * could get stuck in an infinite loop).
+	     * If the deletion callback recreated the command, just throw away
+	     * the new command (if we try to delete it again, we could get
+	     * stuck in an infinite loop).
 	     */
 
 	     ckfree((char *) Tcl_GetHashValue(hPtr));
 	}
     } else {
 	/*
-	 * The list of command exported from the namespace might have
-	 * changed.  However, we do not need to recompute this just
-	 * yet; next time we need the info will be soon enough.
+	 * The list of command exported from the namespace might have changed.
+	 * However, we do not need to recompute this just yet; next time we
+	 * need the info will be soon enough.
 	 */
 
 	TclInvalidateNsCmdLookup(nsPtr);
@@ -1792,8 +1791,8 @@ Tcl_CreateObjCommand(interp, cmdName, proc, clientData, deleteProc)
     cmdPtr->tracePtr = NULL;
 
     /*
-     * Plug in any existing import references found above.  Be sure
-     * to update all of these references to point to the new command.
+     * Plug in any existing import references found above. Be sure to update
+     * all of these references to point to the new command.
      */
 
     if (oldRefPtr != NULL) {
@@ -1824,9 +1823,9 @@ Tcl_CreateObjCommand(interp, cmdName, proc, clientData, deleteProc)
  *
  *	"Wrapper" Tcl_ObjCmdProc used to call an existing string-based
  *	Tcl_CmdProc if no object-based procedure exists for a command. A
- *	pointer to this procedure is stored as the Tcl_ObjCmdProc in a
- *	Command structure. It simply turns around and calls the string
- *	Tcl_CmdProc in the Command structure.
+ *	pointer to this procedure is stored as the Tcl_ObjCmdProc in a Command
+ *	structure. It simply turns around and calls the string Tcl_CmdProc in
+ *	the Command structure.
  *
  * Results:
  *	A standard Tcl object result value.
@@ -1860,9 +1859,8 @@ TclInvokeStringCommand(clientData, interp, objc, objv)
     CONST char **argv = argStorage;
 
     /*
-     * Create the string argument array "argv". Make sure argv is large
-     * enough to hold the objc arguments plus 1 extra for the zero
-     * end-of-argv word.
+     * Create the string argument array "argv". Make sure argv is large enough
+     * to hold the objc arguments plus 1 extra for the zero end-of-argv word.
      */
 
     if ((objc + 1) > NUM_ARGS) {
@@ -1897,10 +1895,10 @@ TclInvokeStringCommand(clientData, interp, objc, objv)
  * TclInvokeObjectCommand --
  *
  *	"Wrapper" Tcl_CmdProc used to call an existing object-based
- *	Tcl_ObjCmdProc if no string-based procedure exists for a command.
- *	A pointer to this procedure is stored as the Tcl_CmdProc in a
- *	Command structure. It simply turns around and calls the object
- *	Tcl_ObjCmdProc in the Command structure.
+ *	Tcl_ObjCmdProc if no string-based procedure exists for a command. A
+ *	pointer to this procedure is stored as the Tcl_CmdProc in a Command
+ *	structure. It simply turns around and calls the object Tcl_ObjCmdProc
+ *	in the Command structure.
  *
  * Results:
  *	A standard Tcl string result value.
@@ -1935,9 +1933,8 @@ TclInvokeObjectCommand(clientData, interp, argc, argv)
     register Tcl_Obj **objv = argStorage;
 
     /*
-     * Create the object argument array "objv". Make sure objv is large
-     * enough to hold the objc arguments plus 1 extra for the zero
-     * end-of-objv word.
+     * Create the object argument array "objv". Make sure objv is large enough
+     * to hold the objc arguments plus 1 extra for the zero end-of-objv word.
      */
 
     if (argc > NUM_ARGS) {
@@ -1958,15 +1955,15 @@ TclInvokeObjectCommand(clientData, interp, argc, argv)
     result = (*cmdPtr->objProc)(cmdPtr->objClientData, interp, argc, objv);
 
     /*
-     * Move the interpreter's object result to the string result, 
-     * then reset the object result.
+     * Move the interpreter's object result to the string result, then reset
+     * the object result.
      */
 
     (void) Tcl_GetStringResult(interp);
 
     /*
-     * Decrement the ref counts for the argument objects created above,
-     * then free the objv array if malloc'ed storage was used.
+     * Decrement the ref counts for the argument objects created above, then
+     * free the objv array if malloc'ed storage was used.
      */
 
     for (i = 0;  i < argc;  i++) {
@@ -1985,11 +1982,11 @@ TclInvokeObjectCommand(clientData, interp, argc, argv)
  *
  * TclRenameCommand --
  *
- *	Called to give an existing Tcl command a different name. Both the
- *	old command name and the new command name can have "::" namespace
- *	qualifiers. If the new command has a different namespace context,
- *	the command will be moved to that namespace and will execute in
- *	the context of that new namespace.
+ *	Called to give an existing Tcl command a different name. Both the old
+ *	command name and the new command name can have "::" namespace
+ *	qualifiers. If the new command has a different namespace context, the
+ *	command will be moved to that namespace and will execute in the
+ *	context of that new namespace.
  *
  *	If the new command name is NULL or the null string, the command is
  *	deleted.
@@ -2021,8 +2018,8 @@ TclRenameCommand(interp, oldName, newName)
     Tcl_DString newFullName;
 
     /*
-     * Find the existing command. An error is returned if cmdName can't
-     * be found.
+     * Find the existing command. An error is returned if cmdName can't be
+     * found.
      */
 
     cmd = Tcl_FindCommand(interp, oldName, (Tcl_Namespace *) NULL,
@@ -2051,10 +2048,9 @@ TclRenameCommand(interp, oldName, newName)
     }
 
     /*
-     * Make sure that the destination command does not already exist.
-     * The rename operation is like creating a command, so we should
-     * automatically create the containing namespaces just like
-     * Tcl_CreateCommand would.
+     * Make sure that the destination command does not already exist. The
+     * rename operation is like creating a command, so we should automatically
+     * create the containing namespaces just like Tcl_CreateCommand would.
      */
 
     TclGetNamespaceForQualName(interp, newName, (Namespace *) NULL,
@@ -2074,15 +2070,15 @@ TclRenameCommand(interp, oldName, newName)
     }
 
     /*
-     * Warning: any changes done in the code here are likely
-     * to be needed in Tcl_HideCommand() code too.
-     * (until the common parts are extracted out)     --dl
+     * Warning: any changes done in the code here are likely to be needed in
+     * Tcl_HideCommand() code too (until the common parts are extracted out).
+     * - dl
      */
 
     /*
-     * Put the command in the new namespace so we can check for an alias
-     * loop. Since we are adding a new command to a namespace, we must
-     * handle any shadowing of the global commands that this might create.
+     * Put the command in the new namespace so we can check for an alias loop.
+     * Since we are adding a new command to a namespace, we must handle any
+     * shadowing of the global commands that this might create.
      */
 
     oldHPtr = cmdPtr->hPtr;
@@ -2093,8 +2089,8 @@ TclRenameCommand(interp, oldName, newName)
     TclResetShadowedCmdRefs(interp, cmdPtr);
 
     /*
-     * Now check for an alias loop. If we detect one, put everything back
-     * the way it was and report the error.
+     * Now check for an alias loop. If we detect one, put everything back the
+     * way it was and report the error.
      */
 
     result = TclPreventAliasLoop(interp, interp, (Tcl_Command) cmdPtr);
@@ -2106,25 +2102,25 @@ TclRenameCommand(interp, oldName, newName)
     }
 
     /*
-     * The list of command exported from the namespace might have
-     * changed.  However, we do not need to recompute this just yet;
-     * next time we need the info will be soon enough.  These might
-     * refer to the same variable, but that's no big deal.
+     * The list of command exported from the namespace might have changed.
+     * However, we do not need to recompute this just yet; next time we need
+     * the info will be soon enough. These might refer to the same variable,
+     * but that's no big deal.
      */
 
     TclInvalidateNsCmdLookup(cmdNsPtr);
     TclInvalidateNsCmdLookup(cmdPtr->nsPtr);
 
     /*
-     * Script for rename traces can delete the command "oldName".
-     * Therefore increment the reference count for cmdPtr so that
-     * it's Command structure is freed only towards the end of this
-     * function by calling TclCleanupCommand.
+     * Script for rename traces can delete the command "oldName". Therefore
+     * increment the reference count for cmdPtr so that it's Command structure
+     * is freed only towards the end of this function by calling
+     * TclCleanupCommand.
      *
-     * The trace procedure needs to get a fully qualified name for
-     * old and new commands [Tcl bug #651271], or else there's no way
-     * for the trace procedure to get the namespace from which the old
-     * command is being renamed!
+     * The trace procedure needs to get a fully qualified name for old and new
+     * commands [Tcl bug #651271], or else there's no way for the trace
+     * procedure to get the namespace from which the old command is being
+     * renamed!
      */
 
     Tcl_DStringInit(&newFullName);
@@ -2139,9 +2135,9 @@ TclRenameCommand(interp, oldName, newName)
     Tcl_DStringFree(&newFullName);
 
     /*
-     * The new command name is okay, so remove the command from its
-     * current namespace. This is like deleting the command, so bump
-     * the cmdEpoch to invalidate any cached references to the command.
+     * The new command name is okay, so remove the command from its current
+     * namespace. This is like deleting the command, so bump the cmdEpoch to
+     * invalidate any cached references to the command.
      */
 
     Tcl_DeleteHashEntry(oldHPtr);
@@ -2149,9 +2145,9 @@ TclRenameCommand(interp, oldName, newName)
 
     /*
      * If the command being renamed has a compile procedure, increment the
-     * interpreter's compileEpoch to invalidate its compiled code. This
-     * makes sure that we don't later try to execute old code compiled for
-     * the now-renamed command.
+     * interpreter's compileEpoch to invalidate its compiled code. This makes
+     * sure that we don't later try to execute old code compiled for the
+     * now-renamed command.
      */
 
     if (cmdPtr->compileProc != NULL) {
@@ -2159,13 +2155,14 @@ TclRenameCommand(interp, oldName, newName)
     }
 
     /*
-     * Now free the Command structure, if the "oldName" command has
-     * been deleted by invocation of rename traces.
+     * Now free the Command structure, if the "oldName" command has been
+     * deleted by invocation of rename traces.
      */
+
     TclCleanupCommand(cmdPtr);
     result = TCL_OK;
 
-    done:
+  done:
     TclDecrRefCount(oldFullName);
     return result;
 }
@@ -2175,16 +2172,15 @@ TclRenameCommand(interp, oldName, newName)
  *
  * Tcl_SetCommandInfo --
  *
- *	Modifies various information about a Tcl command. Note that
- *	this procedure will not change a command's namespace; use
- *	TclRenameCommand to do that. Also, the isNativeObjectProc
- *	member of *infoPtr is ignored.
+ *	Modifies various information about a Tcl command. Note that this
+ *	procedure will not change a command's namespace; use TclRenameCommand
+ *	to do that. Also, the isNativeObjectProc member of *infoPtr is
+ *	ignored.
  *
  * Results:
- *	If cmdName exists in interp, then the information at *infoPtr
- *	is stored with the command in place of the current information
- *	and 1 is returned. If the command doesn't exist then 0 is
- *	returned. 
+ *	If cmdName exists in interp, then the information at *infoPtr is
+ *	stored with the command in place of the current information and 1 is
+ *	returned. If the command doesn't exist then 0 is returned.
  *
  * Side effects:
  *	None.
@@ -2194,11 +2190,11 @@ TclRenameCommand(interp, oldName, newName)
 
 int
 Tcl_SetCommandInfo(interp, cmdName, infoPtr)
-    Tcl_Interp *interp;			/* Interpreter in which to look
-					 * for command. */
-    CONST char *cmdName;		/* Name of desired command. */
-    CONST Tcl_CmdInfo *infoPtr;		/* Where to find information
-					 * to store in the command. */
+    Tcl_Interp *interp;		/* Interpreter in which to look for
+				 * command. */
+    CONST char *cmdName;	/* Name of desired command. */
+    CONST Tcl_CmdInfo *infoPtr;	/* Where to find information to store in the
+				 * command. */
 {
     Tcl_Command cmd;
 
@@ -2214,16 +2210,15 @@ Tcl_SetCommandInfo(interp, cmdName, infoPtr)
  *
  * Tcl_SetCommandInfoFromToken --
  *
- *	Modifies various information about a Tcl command. Note that
- *	this procedure will not change a command's namespace; use
- *	TclRenameCommand to do that. Also, the isNativeObjectProc
- *	member of *infoPtr is ignored.
+ *	Modifies various information about a Tcl command. Note that this
+ *	procedure will not change a command's namespace; use TclRenameCommand
+ *	to do that. Also, the isNativeObjectProc member of *infoPtr is
+ *	ignored.
  *
  * Results:
- *	If cmdName exists in interp, then the information at *infoPtr
- *	is stored with the command in place of the current information
- *	and 1 is returned. If the command doesn't exist then 0 is
- *	returned. 
+ *	If cmdName exists in interp, then the information at *infoPtr is
+ *	stored with the command in place of the current information and 1 is
+ *	returned. If the command doesn't exist then 0 is returned.
  *
  * Side effects:
  *	None.
@@ -2269,10 +2264,9 @@ Tcl_SetCommandInfoFromToken(cmd, infoPtr)
  *	Returns various information about a Tcl command.
  *
  * Results:
- *	If cmdName exists in interp, then *infoPtr is modified to
- *	hold information about cmdName and 1 is returned.  If the
- *	command doesn't exist then 0 is returned and *infoPtr isn't
- *	modified.
+ *	If cmdName exists in interp, then *infoPtr is modified to hold
+ *	information about cmdName and 1 is returned. If the command doesn't
+ *	exist then 0 is returned and *infoPtr isn't modified.
  *
  * Side effects:
  *	None.
@@ -2282,11 +2276,11 @@ Tcl_SetCommandInfoFromToken(cmd, infoPtr)
 
 int
 Tcl_GetCommandInfo(interp, cmdName, infoPtr)
-    Tcl_Interp *interp;			/* Interpreter in which to look
-					 * for command. */
-    CONST char *cmdName;		/* Name of desired command. */
-    Tcl_CmdInfo *infoPtr;		/* Where to store information about
-					 * command. */
+    Tcl_Interp *interp;		/* Interpreter in which to look for
+				 * command. */
+    CONST char *cmdName;	/* Name of desired command. */
+    Tcl_CmdInfo *infoPtr;	/* Where to store information about
+				 * command. */
 {
     Tcl_Command cmd;
 
@@ -2305,9 +2299,9 @@ Tcl_GetCommandInfo(interp, cmdName, infoPtr)
  *	Returns various information about a Tcl command.
  *
  * Results:
- *	Copies information from the command identified by 'cmd' into
- *	a caller-supplied structure and returns 1.  If the 'cmd' is
- *	NULL, leaves the structure untouched and returns 0.
+ *	Copies information from the command identified by 'cmd' into a
+ *	caller-supplied structure and returns 1. If the 'cmd' is NULL, leaves
+ *	the structure untouched and returns 0.
  *
  * Side effects:
  *	None.
@@ -2320,7 +2314,6 @@ Tcl_GetCommandInfoFromToken(cmd, infoPtr)
     Tcl_Command cmd;
     Tcl_CmdInfo* infoPtr;
 {
-
     Command* cmdPtr;		/* Internal representation of the command */
 
     if (cmd == (Tcl_Command) NULL) {
@@ -2352,9 +2345,9 @@ Tcl_GetCommandInfoFromToken(cmd, infoPtr)
  *
  * Tcl_GetCommandName --
  *
- *	Given a token returned by Tcl_CreateCommand, this procedure
- *	returns the current name of the command (which may have changed
- *	due to renaming).
+ *	Given a token returned by Tcl_CreateCommand, this procedure returns
+ *	the current name of the command (which may have changed due to
+ *	renaming).
  *
  * Results:
  *	The return value is the name of the given command.
@@ -2369,21 +2362,21 @@ CONST char *
 Tcl_GetCommandName(interp, command)
     Tcl_Interp *interp;		/* Interpreter containing the command. */
     Tcl_Command command;	/* Token for command returned by a previous
-				 * call to Tcl_CreateCommand. The command
-				 * must not have been deleted. */
+				 * call to Tcl_CreateCommand. The command must
+				 * not have been deleted. */
 {
     Command *cmdPtr = (Command *) command;
 
     if ((cmdPtr == NULL) || (cmdPtr->hPtr == NULL)) {
-
 	/*
 	 * This should only happen if command was "created" after the
-	 * interpreter began to be deleted, so there isn't really any
-	 * command. Just return an empty string.
+	 * interpreter began to be deleted, so there isn't really any command.
+	 * Just return an empty string.
 	 */
 
 	return "";
     }
+
     return Tcl_GetHashKey(cmdPtr->hPtr->tablePtr, cmdPtr->hPtr);
 }
 
@@ -2392,17 +2385,17 @@ Tcl_GetCommandName(interp, command)
  *
  * Tcl_GetCommandFullName --
  *
- *	Given a token returned by, e.g., Tcl_CreateCommand or
- *	Tcl_FindCommand, this procedure appends to an object the command's
- *	full name, qualified by a sequence of parent namespace names. The
- *	command's fully-qualified name may have changed due to renaming.
+ *	Given a token returned by, e.g., Tcl_CreateCommand or Tcl_FindCommand,
+ *	this procedure appends to an object the command's full name, qualified
+ *	by a sequence of parent namespace names. The command's fully-qualified
+ *	name may have changed due to renaming.
  *
  * Results:
  *	None.
  *
  * Side effects:
  *	The command's fully-qualified name is appended to the string
- *	representation of objPtr. 
+ *	representation of objPtr.
  *
  *----------------------------------------------------------------------
  */
@@ -2411,8 +2404,8 @@ void
 Tcl_GetCommandFullName(interp, command, objPtr)
     Tcl_Interp *interp;		/* Interpreter containing the command. */
     Tcl_Command command;	/* Token for command returned by a previous
-				 * call to Tcl_CreateCommand. The command
-				 * must not have been deleted. */
+				 * call to Tcl_CreateCommand. The command must
+				 * not have been deleted. */
     Tcl_Obj *objPtr;		/* Points to the object onto which the
 				 * command's full name is appended. */
 
@@ -2448,20 +2441,19 @@ Tcl_GetCommandFullName(interp, command, objPtr)
  *	Remove the given command from the given interpreter.
  *
  * Results:
- *	0 is returned if the command was deleted successfully.
- *	-1 is returned if there didn't exist a command by that name.
+ *	0 is returned if the command was deleted successfully. -1 is returned
+ *	if there didn't exist a command by that name.
  *
  * Side effects:
- *	cmdName will no longer be recognized as a valid command for
- *	interp.
+ *	cmdName will no longer be recognized as a valid command for interp.
  *
  *----------------------------------------------------------------------
  */
 
 int
 Tcl_DeleteCommand(interp, cmdName)
-    Tcl_Interp *interp;		/* Token for command interpreter (returned
-				 * by a previous Tcl_CreateInterp call). */
+    Tcl_Interp *interp;		/* Token for command interpreter (returned by
+				 * a previous Tcl_CreateInterp call). */
     CONST char *cmdName;	/* Name of command to remove. */
 {
     Tcl_Command cmd;
@@ -2484,24 +2476,24 @@ Tcl_DeleteCommand(interp, cmdName)
  * Tcl_DeleteCommandFromToken --
  *
  *	Removes the given command from the given interpreter. This procedure
- *	resembles Tcl_DeleteCommand, but takes a Tcl_Command token instead
- *	of a command name for efficiency.
+ *	resembles Tcl_DeleteCommand, but takes a Tcl_Command token instead of
+ *	a command name for efficiency.
  *
  * Results:
- *	0 is returned if the command was deleted successfully.
- *	-1 is returned if there didn't exist a command by that name.
+ *	0 is returned if the command was deleted successfully. -1 is returned
+ *	if there didn't exist a command by that name.
  *
  * Side effects:
- *	The command specified by "cmd" will no longer be recognized as a
- *	valid command for "interp".
+ *	The command specified by "cmd" will no longer be recognized as a valid
+ *	command for "interp".
  *
  *----------------------------------------------------------------------
  */
 
 int
 Tcl_DeleteCommandFromToken(interp, cmd)
-    Tcl_Interp *interp;		/* Token for command interpreter returned by
-				 * a previous call to Tcl_CreateInterp. */
+    Tcl_Interp *interp;		/* Token for command interpreter returned by a
+				 * previous call to Tcl_CreateInterp. */
     Tcl_Command cmd;		/* Token for command to delete. */
 {
     Interp *iPtr = (Interp *) interp;
@@ -2510,22 +2502,21 @@ Tcl_DeleteCommandFromToken(interp, cmd)
     Tcl_Command importCmd;
 
     /*
-     * The code here is tricky.  We can't delete the hash table entry
-     * before invoking the deletion callback because there are cases
-     * where the deletion callback needs to invoke the command (e.g.
-     * object systems such as OTcl). However, this means that the
-     * callback could try to delete or rename the command. The deleted
-     * flag allows us to detect these cases and skip nested deletes.
+     * The code here is tricky. We can't delete the hash table entry before
+     * invoking the deletion callback because there are cases where the
+     * deletion callback needs to invoke the command (e.g. object systems such
+     * as OTcl). However, this means that the callback could try to delete or
+     * rename the command. The deleted flag allows us to detect these cases
+     * and skip nested deletes.
      */
 
     if (cmdPtr->flags & CMD_IS_DELETED) {
 	/*
-	 * Another deletion is already in progress.  Remove the hash
-	 * table entry now, but don't invoke a callback or free the
-	 * command structure. Take care to only remove the hash entry
-	 * if it has not already been removed; otherwise if we manage
-	 * to hit this function three times, everything goes up in
-	 * smoke. [Bug 1220058]
+	 * Another deletion is already in progress. Remove the hash table
+	 * entry now, but don't invoke a callback or free the command
+	 * structure. Take care to only remove the hash entry if it has not
+	 * already been removed; otherwise if we manage to hit this function
+	 * three times, everything goes up in smoke. [Bug 1220058]
 	 */
 
 	if (cmdPtr->hPtr != NULL) {
@@ -2535,24 +2526,29 @@ Tcl_DeleteCommandFromToken(interp, cmd)
 	return 0;
     }
 
-    /* 
-     * We must delete this command, even though both traces and
-     * delete procs may try to avoid this (renaming the command etc).
-     * Also traces and delete procs may try to delete the command
-     * themsevles.  This flag declares that a delete is in progress
-     * and that recursive deletes should be ignored.
+    /*
+     * We must delete this command, even though both traces and delete procs
+     * may try to avoid this (renaming the command etc). Also traces and
+     * delete procs may try to delete the command themsevles. This flag
+     * declares that a delete is in progress and that recursive deletes should
+     * be ignored.
      */
+
     cmdPtr->flags |= CMD_IS_DELETED;
 
     /*
-     * Call trace procedures for the command being deleted. Then delete
-     * its traces. 
+     * Call trace procedures for the command being deleted. Then delete its
+     * traces.
      */
 
     if (cmdPtr->tracePtr != NULL) {
 	CommandTrace *tracePtr;
 	CallCommandTraces(iPtr,cmdPtr,NULL,NULL,TCL_TRACE_DELETE);
-	/* Now delete these traces */
+
+	/*
+	 * Now delete these traces.
+	 */
+
 	tracePtr = cmdPtr->tracePtr;
 	while (tracePtr != NULL) {
 	    CommandTrace *nextPtr = tracePtr->nextPtr;
@@ -2565,20 +2561,20 @@ Tcl_DeleteCommandFromToken(interp, cmd)
     }
 
     /*
-     * The list of command exported from the namespace might have
-     * changed.  However, we do not need to recompute this just yet;
-     * next time we need the info will be soon enough.
+     * The list of command exported from the namespace might have changed.
+     * However, we do not need to recompute this just yet; next time we need
+     * the info will be soon enough.
      */
 
     TclInvalidateNsCmdLookup(cmdPtr->nsPtr);
 
     /*
      * If the command being deleted has a compile procedure, increment the
-     * interpreter's compileEpoch to invalidate its compiled code. This
-     * makes sure that we don't later try to execute old code compiled with
-     * command-specific (i.e., inline) bytecodes for the now-deleted
-     * command. This field is checked in Tcl_EvalObj and ObjInterpProc, and
-     * code whose compilation epoch doesn't match is recompiled.
+     * interpreter's compileEpoch to invalidate its compiled code. This makes
+     * sure that we don't later try to execute old code compiled with
+     * command-specific (i.e., inline) bytecodes for the now-deleted command.
+     * This field is checked in Tcl_EvalObj and ObjInterpProc, and code whose
+     * compilation epoch doesn't match is recompiled.
      */
 
     if (cmdPtr->compileProc != NULL) {
@@ -2595,12 +2591,12 @@ Tcl_DeleteCommandFromToken(interp, cmd)
 
 	/*
 	 * If you are getting a crash during the call to deleteProc and
-	 * cmdPtr->deleteProc is a pointer to the function free(), the
-	 * most likely cause is that your extension allocated memory
-	 * for the clientData argument to Tcl_CreateObjCommand() with
-	 * the ckalloc() macro and you are now trying to deallocate
-	 * this memory with free() instead of ckfree(). You should
-	 * pass a pointer to your own method that calls ckfree().
+	 * cmdPtr->deleteProc is a pointer to the function free(), the most
+	 * likely cause is that your extension allocated memory for the
+	 * clientData argument to Tcl_CreateObjCommand() with the ckalloc()
+	 * macro and you are now trying to deallocate this memory with free()
+	 * instead of ckfree(). You should pass a pointer to your own method
+	 * that calls ckfree().
 	 */
 
 	(*cmdPtr->deleteProc)(cmdPtr->deleteData);
@@ -2627,10 +2623,10 @@ Tcl_DeleteCommandFromToken(interp, cmd)
     }
 
     /*
-     * Don't use hPtr to delete the hash entry here, because it's
-     * possible that the deletion callback renamed the command.
-     * Instead, use cmdPtr->hptr, and make sure that no-one else
-     * has already deleted the hash entry.
+     * Don't use hPtr to delete the hash entry here, because it's possible
+     * that the deletion callback renamed the command. Instead, use
+     * cmdPtr->hptr, and make sure that no-one else has already deleted the
+     * hash entry.
      */
 
     if (cmdPtr->hPtr != NULL) {
@@ -2641,19 +2637,19 @@ Tcl_DeleteCommandFromToken(interp, cmd)
      * Mark the Command structure as no longer valid. This allows
      * TclExecuteByteCode to recognize when a Command has logically been
      * deleted and a pointer to this Command structure cached in a CmdName
-     * object is invalid. TclExecuteByteCode will look up the command again
-     * in the interpreter's command hashtable.
+     * object is invalid. TclExecuteByteCode will look up the command again in
+     * the interpreter's command hashtable.
      */
 
     cmdPtr->objProc = NULL;
 
     /*
-     * Now free the Command structure, unless there is another reference to
-     * it from a CmdName Tcl object in some ByteCode code sequence. In that
-     * case, delay the cleanup until all references are either discarded
-     * (when a ByteCode is freed) or replaced by a new reference (when a
-     * cached CmdName Command reference is found to be invalid and
-     * TclExecuteByteCode looks up the command in the command hashtable).
+     * Now free the Command structure, unless there is another reference to it
+     * from a CmdName Tcl object in some ByteCode code sequence. In that case,
+     * delay the cleanup until all references are either discarded (when a
+     * ByteCode is freed) or replaced by a new reference (when a cached
+     * CmdName Command reference is found to be invalid and TclExecuteByteCode
+     * looks up the command in the command hashtable).
      */
 
     TclCleanupCommand(cmdPtr);
@@ -2663,15 +2659,14 @@ Tcl_DeleteCommandFromToken(interp, cmd)
 static char *
 CallCommandTraces(iPtr, cmdPtr, oldName, newName, flags)
     Interp *iPtr;		/* Interpreter containing command. */
-    Command *cmdPtr;		/* Command whose traces are to be
-				 * invoked. */
-    CONST char *oldName;	/* Command's old name, or NULL if we
-				 * must get the name from cmdPtr */
-    CONST char *newName;	/* Command's new name, or NULL if
-				 * the command is not being renamed */
-    int flags;			/* Flags indicating the type of traces
-				 * to trigger, either TCL_TRACE_DELETE
-				 * or TCL_TRACE_RENAME. */
+    Command *cmdPtr;		/* Command whose traces are to be invoked. */
+    CONST char *oldName;	/* Command's old name, or NULL if we must get
+				 * the name from cmdPtr */
+    CONST char *newName;	/* Command's new name, or NULL if the command
+				 * is not being renamed */
+    int flags;			/* Flags indicating the type of traces to
+				 * trigger, either TCL_TRACE_DELETE or
+				 * TCL_TRACE_RENAME. */
 {
     register CommandTrace *tracePtr;
     ActiveCommandTrace active;
@@ -2679,16 +2674,17 @@ CallCommandTraces(iPtr, cmdPtr, oldName, newName, flags)
     Tcl_Obj *oldNamePtr = NULL;
 
     if (cmdPtr->flags & CMD_TRACE_ACTIVE) {
-	/* 
-	 * While a rename trace is active, we will not process any more
-	 * rename traces; while a delete trace is active we will never
-	 * reach here -- because Tcl_DeleteCommandFromToken checks for the
-	 * condition (cmdPtr->flags & CMD_IS_DELETED) and returns immediately
-	 * when a command deletion is in progress.  For all other traces,
-	 * delete traces will not be invoked but a call to TraceCommandProc
-	 * will ensure that tracePtr->clientData is freed whenever the
-	 * command "oldName" is deleted.
+	/*
+	 * While a rename trace is active, we will not process any more rename
+	 * traces; while a delete trace is active we will never reach here -
+	 * because Tcl_DeleteCommandFromToken checks for the condition
+	 * (cmdPtr->flags & CMD_IS_DELETED) and returns immediately when a
+	 * command deletion is in progress. For all other traces, delete
+	 * traces will not be invoked but a call to TraceCommandProc will
+	 * ensure that tracePtr->clientData is freed whenever the command
+	 * "oldName" is deleted.
 	 */
+
 	if (cmdPtr->flags & TCL_TRACE_RENAME) {
 	    flags &= ~TCL_TRACE_RENAME;
 	}
@@ -2721,7 +2717,7 @@ CallCommandTraces(iPtr, cmdPtr, oldName, newName, flags)
 	if (oldName == NULL) {
 	    TclNewObj(oldNamePtr);
 	    Tcl_IncrRefCount(oldNamePtr);
-	    Tcl_GetCommandFullName((Tcl_Interp *) iPtr, 
+	    Tcl_GetCommandFullName((Tcl_Interp *) iPtr,
 		    (Tcl_Command) cmdPtr, oldNamePtr);
 	    oldName = TclGetString(oldNamePtr);
 	}
@@ -2735,8 +2731,7 @@ CallCommandTraces(iPtr, cmdPtr, oldName, newName, flags)
     }
 
     /*
-     * If a new object was created to hold the full oldName,
-     * free it now.
+     * If a new object was created to hold the full oldName, free it now.
      */
 
     if (oldNamePtr != NULL) {
@@ -2744,8 +2739,8 @@ CallCommandTraces(iPtr, cmdPtr, oldName, newName, flags)
     }
 
     /*
-     * Restore the variable's flags, remove the record of our active
-     * traces, and then return.
+     * Restore the variable's flags, remove the record of our active traces,
+     * and then return.
      */
 
     cmdPtr->flags &= ~CMD_TRACE_ACTIVE;
@@ -2763,7 +2758,7 @@ CallCommandTraces(iPtr, cmdPtr, oldName, newName, flags)
  *	This procedure frees up a Command structure unless it is still
  *	referenced from an interpreter's command hashtable or from a CmdName
  *	Tcl object representing the name of a command in a ByteCode
- *	instruction sequence. 
+ *	instruction sequence.
  *
  * Results:
  *	None.
@@ -2792,18 +2787,17 @@ TclCleanupCommand(cmdPtr)
  *
  * Tcl_CreateMathFunc --
  *
- *	Creates a new math function for expressions in a given
- *	interpreter.
+ *	Creates a new math function for expressions in a given interpreter.
  *
  * Results:
  *	None.
  *
  * Side effects:
  *	The function defined by "name" is created or redefined. If the
- *	function already exists then its definition is replaced; this
- *	includes the builtin functions. Redefining a builtin function forces
- *	all existing code to be invalidated since that code may be compiled
- *	using an instruction specific to the replaced function. In addition,
+ *	function already exists then its definition is replaced; this includes
+ *	the builtin functions. Redefining a builtin function forces all
+ *	existing code to be invalidated since that code may be compiled using
+ *	an instruction specific to the replaced function. In addition,
  *	redefioning a non-builtin function will force existing code to be
  *	invalidated if the number of arguments has changed.
  *
@@ -2812,23 +2806,23 @@ TclCleanupCommand(cmdPtr)
 
 void
 Tcl_CreateMathFunc(interp, name, numArgs, argTypes, proc, clientData)
-    Tcl_Interp *interp;			/* Interpreter in which function is
-					 * to be available. */
-    CONST char *name;			/* Name of function (e.g. "sin"). */
-    int numArgs;			/* Nnumber of arguments required by
-					 * function. */
-    Tcl_ValueType *argTypes;		/* Array of types acceptable for
-					 * each argument. */
-    Tcl_MathProc *proc;			/* Procedure that implements the
-					 * math function. */
-    ClientData clientData;		/* Additional value to pass to the
-					 * function. */
+    Tcl_Interp *interp;		/* Interpreter in which function is to be
+				 * available. */
+    CONST char *name;		/* Name of function (e.g. "sin"). */
+    int numArgs;		/* Nnumber of arguments required by
+				 * function. */
+    Tcl_ValueType *argTypes;	/* Array of types acceptable for each
+				 * argument. */
+    Tcl_MathProc *proc;		/* Procedure that implements the math
+				 * function. */
+    ClientData clientData;	/* Additional value to pass to the
+				 * function. */
 {
 
     Tcl_DString bigName;
 
-    OldMathFuncData* data = (OldMathFuncData*)
-	    Tcl_Alloc(sizeof(OldMathFuncData));
+    OldMathFuncData *data = (OldMathFuncData *)
+	    ckalloc(sizeof(OldMathFuncData));
 
     if (numArgs > MAX_MATH_ARGS) {
 	Tcl_Panic("attempt to create a math function with too many args");
@@ -2868,11 +2862,11 @@ Tcl_CreateMathFunc(interp, name, numArgs, argTypes, proc, clientData)
 
 static int
 OldMathFuncProc(clientData, interp, objc, objv)
-     ClientData clientData;	/* Ponter to OldMathFuncData describing
-				 * the function being called */
-     Tcl_Interp* interp;	/* Tcl interpreter */
-     int objc;			/* Actual parameter count */
-     Tcl_Obj *CONST *objv;	/* Parameter vector */
+    ClientData clientData;	/* Ponter to OldMathFuncData describing the
+				 * function being called */
+    Tcl_Interp *interp;		/* Tcl interpreter */
+    int objc;			/* Actual parameter count */
+    Tcl_Obj *CONST *objv;	/* Parameter vector */
 {
     Tcl_Obj* valuePtr;
     OldMathFuncData* dataPtr = (OldMathFuncData*) clientData;
@@ -2882,14 +2876,18 @@ OldMathFuncProc(clientData, interp, objc, objv)
     int i, j, k;
     double d;
 
-    /* Check argument count */
+    /*
+     * Check argument count.
+     */
 
     if (objc != dataPtr->numArgs + 1) {
 	MathFuncWrongNumArgs(interp, dataPtr->numArgs+1, objc, objv);
 	return TCL_ERROR;
     }
 
-    /* Convert arguments from Tcl_Obj's to Tcl_Value's */
+    /*
+     * Convert arguments from Tcl_Obj's to Tcl_Value's.
+     */
 
     for (j = 1, k = 0; j < objc; ++j, ++k) {
 	valuePtr = objv[j];
@@ -2898,8 +2896,8 @@ OldMathFuncProc(clientData, interp, objc, objv)
 	}
 
 	/*
-	 * Copy the object's numeric value to the argument record,
-	 * converting it if necessary. 
+	 * Copy the object's numeric value to the argument record, converting
+	 * it if necessary.
 	 */
 
 	if (valuePtr->typePtr == &tclIntType) {
@@ -2942,15 +2940,18 @@ OldMathFuncProc(clientData, interp, objc, objv)
 	}
     }
 
-    /* Call the function */
+    /*
+     * Call the function.
+     */
 
-    result = (*dataPtr->proc)(dataPtr->clientData, interp, args,
-	    &funcResult);
+    result = (*dataPtr->proc)(dataPtr->clientData, interp, args, &funcResult);
     if (result != TCL_OK) {
 	return result;
     }
 
-    /* Return the result of the call */
+    /*
+     * Return the result of the call.
+     */
 
     if (funcResult.type == TCL_INT) {
 	TclNewLongObj(valuePtr, funcResult.intValue);
@@ -3004,24 +3005,24 @@ OldMathFuncDeleteProc(clientData)
  *	interpreter.
  *
  * Results:
- *	TCL_OK if it succeeds, TCL_ERROR else (leaving an error message
- *	in the interpreter result if that happens.)
+ *	TCL_OK if it succeeds, TCL_ERROR else (leaving an error message in the
+ *	interpreter result if that happens.)
  *
  * Side effects:
- *	If this function succeeds, the variables pointed to by the
- *	numArgsPtr and argTypePtr arguments will be updated to detail the
- *	arguments allowed by the function.  The variable pointed to by the
- *	procPtr argument will be set to NULL if the function is a builtin
- *	function, and will be set to the address of the C function used to
- *	implement the math function otherwise (in which case the variable
- *	pointed to by the clientDataPtr argument will also be updated.)
+ *	If this function succeeds, the variables pointed to by the numArgsPtr
+ *	and argTypePtr arguments will be updated to detail the arguments
+ *	allowed by the function. The variable pointed to by the procPtr
+ *	argument will be set to NULL if the function is a builtin function,
+ *	and will be set to the address of the C function used to implement the
+ *	math function otherwise (in which case the variable pointed to by the
+ *	clientDataPtr argument will also be updated.)
  *
  *----------------------------------------------------------------------
  */
 
 int
 Tcl_GetMathFuncInfo(interp, name, numArgsPtr, argTypesPtr, procPtr,
-		    clientDataPtr)
+	clientDataPtr)
     Tcl_Interp *interp;
     CONST char *name;
     int *numArgsPtr;
@@ -3029,11 +3030,12 @@ Tcl_GetMathFuncInfo(interp, name, numArgsPtr, argTypesPtr, procPtr,
     Tcl_MathProc **procPtr;
     ClientData *clientDataPtr;
 {
-
     Tcl_Obj* cmdNameObj;
     Command* cmdPtr;
 
-    /* Get the command that implements the math function */
+    /*
+     * Get the command that implements the math function.
+     */
 
     cmdNameObj = Tcl_NewStringObj("tcl::mathfunc::", -1);
     Tcl_AppendToObj(cmdNameObj, name, -1);
@@ -3041,22 +3043,24 @@ Tcl_GetMathFuncInfo(interp, name, numArgsPtr, argTypesPtr, procPtr,
     cmdPtr = (Command*) Tcl_GetCommandFromObj(interp, cmdNameObj);
     Tcl_DecrRefCount(cmdNameObj);
 
-    /* Report unknown functions */
+    /*
+     * Report unknown functions.
+     */
 
     if (cmdPtr == NULL) {
 	Tcl_Obj* message;
 	message = Tcl_NewStringObj("unknown math function \"", -1);
 	Tcl_AppendToObj(message, name, -1);
 	Tcl_AppendToObj(message, "\"", 1);
-	*numArgsPtr = -1; *argTypesPtr = NULL; 
+	*numArgsPtr = -1; *argTypesPtr = NULL;
 	*procPtr = NULL;
 	*clientDataPtr = NULL;
 	return TCL_ERROR;
     }
 
-    /* 
-     * Retrieve function info for user defined functions; return
-     * dummy information for builtins.
+    /*
+     * Retrieve function info for user defined functions; return dummy
+     * information for builtins.
      */
 
     if (cmdPtr->objProc == &OldMathFuncProc) {
@@ -3085,9 +3089,9 @@ Tcl_GetMathFuncInfo(interp, name, numArgsPtr, argTypesPtr, procPtr,
  *	interpreter.
  *
  * Results:
- *	A pointer to a Tcl_Obj structure with a reference count of zero,
- *	or NULL in the case of an error (in which case a suitable error
- *	message will be left in the interpreter result.)
+ *	A pointer to a Tcl_Obj structure with a reference count of zero, or
+ *	NULL in the case of an error (in which case a suitable error message
+ *	will be left in the interpreter result.)
  *
  * Side effects:
  *	None.
@@ -3140,13 +3144,12 @@ Tcl_ListMathFuncs(interp, pattern)
  *
  * TclInterpReady --
  *
- *	Check if an interpreter is ready to eval commands or scripts, 
- *	i.e., if it was not deleted and if the nesting level is not 
- *	too high.
+ *	Check if an interpreter is ready to eval commands or scripts, i.e., if
+ *	it was not deleted and if the nesting level is not too high.
  *
  * Results:
- *	The return value is TCL_OK if it the interpreter is ready, 
- *	TCL_ERROR otherwise.
+ *	The return value is TCL_OK if it the interpreter is ready, TCL_ERROR
+ *	otherwise.
  *
  * Side effects:
  *	The interpreters object and string results are cleared.
@@ -3154,15 +3157,15 @@ Tcl_ListMathFuncs(interp, pattern)
  *----------------------------------------------------------------------
  */
 
-int 
+int
 TclInterpReady(interp)
     Tcl_Interp *interp;
 {
     register Interp *iPtr = (Interp *) interp;
 
     /*
-     * Reset both the interpreter's string and object results and clear 
-     * out any previous error information. 
+     * Reset both the interpreter's string and object results and clear out
+     * any previous error information.
      */
 
     Tcl_ResetResult(interp);
@@ -3181,14 +3184,14 @@ TclInterpReady(interp)
     }
 
     /*
-     * Check depth of nested calls to Tcl_Eval:  if this gets too large,
-     * it's probably because of an infinite loop somewhere.
+     * Check depth of nested calls to Tcl_Eval: if this gets too large, it's
+     * probably because of an infinite loop somewhere.
      */
 
-    if (((iPtr->numLevels) > iPtr->maxNestingDepth) 
+    if (((iPtr->numLevels) > iPtr->maxNestingDepth)
 	    || (TclpCheckStackSpace() == 0)) {
 	Tcl_AppendResult(interp,
-		"too many nested evaluations (infinite loop?)", (char *) NULL); 
+		"too many nested evaluations (infinite loop?)", (char *) NULL);
 	return TCL_ERROR;
     }
 
@@ -3200,15 +3203,15 @@ TclInterpReady(interp)
  *
  * TclEvalObjvInternal --
  *
- *	This procedure evaluates a Tcl command that has already been
- *	parsed into words, with one Tcl_Obj holding each word. The caller
- *	is responsible for managing the iPtr->numLevels.
+ *	This procedure evaluates a Tcl command that has already been parsed
+ *	into words, with one Tcl_Obj holding each word. The caller is
+ *	responsible for managing the iPtr->numLevels.
  *
  * Results:
- *	The return value is a standard Tcl completion code such as
- *	TCL_OK or TCL_ERROR.  A result or error message is left in
- *	interp's result.  If an error occurs, this procedure does
- *	NOT add any information to the errorInfo variable.
+ *	The return value is a standard Tcl completion code such as TCL_OK or
+ *	TCL_ERROR. A result or error message is left in interp's result. If an
+ *	error occurs, this procedure does NOT add any information to the
+ *	errorInfo variable.
  *
  * Side effects:
  *	Depends on the command.
@@ -3219,23 +3222,21 @@ TclInterpReady(interp)
 int
 TclEvalObjvInternal(interp, objc, objv, command, length, flags)
     Tcl_Interp *interp;		/* Interpreter in which to evaluate the
-				 * command.  Also used for error
-				 * reporting. */
+				 * command. Also used for error reporting. */
     int objc;			/* Number of words in command. */
     Tcl_Obj *CONST objv[];	/* An array of pointers to objects that are
 				 * the words that make up the command. */
     CONST char *command;	/* Points to the beginning of the string
-				 * representation of the command; this
-				 * is used for traces.  If the string
-				 * representation of the command is
-				 * unknown, an empty string should be
-				 * supplied. If it is NULL, no traces will
-				 * be called. */
+				 * representation of the command; this is used
+				 * for traces. If the string representation of
+				 * the command is unknown, an empty string
+				 * should be supplied. If it is NULL, no
+				 * traces will be called. */
     int length;			/* Number of bytes in command; if -1, all
 				 * characters up to the first null byte are
 				 * used. */
-    int flags;			/* Collection of OR-ed bits that control
-				 * the evaluation of the script.  Only
+    int flags;			/* Collection of OR-ed bits that control the
+				 * evaluation of the script. Only
 				 * TCL_EVAL_GLOBAL and TCL_EVAL_INVOKE are
 				 * currently supported. */
 
@@ -3244,8 +3245,8 @@ TclEvalObjvInternal(interp, objc, objv, command, length, flags)
     Interp *iPtr = (Interp *) interp;
     Tcl_Obj **newObjv;
     int i;
-    CallFrame *savedVarFramePtr;	/* Saves old copy of iPtr->varFramePtr
-					 * in case TCL_EVAL_GLOBAL was set. */
+    CallFrame *savedVarFramePtr;/* Saves old copy of iPtr->varFramePtr in case
+				 * TCL_EVAL_GLOBAL was set. */
     int code = TCL_OK;
     int traceCode = TCL_OK;
     int checkTraces = 1;
@@ -3259,18 +3260,17 @@ TclEvalObjvInternal(interp, objc, objv, command, length, flags)
     }
 
     /*
-     * Find the procedure to execute this command. If there isn't one,
-     * then see if there is a command "unknown".  If so, create a new
-     * word array with "unknown" as the first word and the original
-     * command words as arguments.  Then call ourselves recursively to
-     * execute it.
+     * Find the procedure to execute this command. If there isn't one, then
+     * see if there is a command "unknown". If so, create a new word array
+     * with "unknown" as the first word and the original command words as
+     * arguments. Then call ourselves recursively to execute it.
      *
      * If caller requests, or if we're resolving the target end of an
      * interpeter alias (TCL_EVAL_INVOKE), be sure to do command name
      * resolution in the global namespace.
      *
-     * If any execution traces rename or delete the current command,
-     * we may need (at most) two passes here.
+     * If any execution traces rename or delete the current command, we may
+     * need (at most) two passes here.
      */
 
   reparseBecauseOfTraces:
@@ -3282,8 +3282,8 @@ TclEvalObjvInternal(interp, objc, objv, command, length, flags)
     iPtr->varFramePtr = savedVarFramePtr;
 
     if (cmdPtr == NULL) {
-	newObjv = (Tcl_Obj **) ckalloc((unsigned)
-		((objc + 1) * sizeof(Tcl_Obj *)));
+	newObjv = (Tcl_Obj **)
+		ckalloc((unsigned) ((objc + 1) * sizeof(Tcl_Obj *)));
 	for (i = objc-1; i >= 0; i--) {
 	    newObjv[i+1] = objv[i];
 	}
@@ -3308,14 +3308,17 @@ TclEvalObjvInternal(interp, objc, objv, command, length, flags)
     /*
      * Call trace procedures if needed.
      */
+
     if ((checkTraces) && (command != NULL)) {
 	int cmdEpoch = cmdPtr->cmdEpoch;
 	cmdPtr->refCount++;
-	/* 
-	 * If the first set of traces modifies/deletes the command or
-	 * any existing traces, then the set checkTraces to 0 and go
-	 * through this while loop one more time.
+
+	/*
+	 * If the first set of traces modifies/deletes the command or any
+	 * existing traces, then the set checkTraces to 0 and go through this
+	 * while loop one more time.
 	 */
+
 	if (iPtr->tracePtr != NULL && traceCode == TCL_OK) {
 	    traceCode = TclCheckInterpTraces(interp, command, length,
 		    cmdPtr, code, TCL_TRACE_ENTER_EXEC, objc, objv);
@@ -3326,7 +3329,10 @@ TclEvalObjvInternal(interp, objc, objv, command, length, flags)
 	}
 	cmdPtr->refCount--;
 	if (cmdEpoch != cmdPtr->cmdEpoch) {
-	    /* The command has been modified in some way */
+	    /*
+	     * The command has been modified in some way.
+	     */
+
 	    checkTraces = 0;
 	    goto reparseBecauseOfTraces;
 	}
@@ -3335,6 +3341,7 @@ TclEvalObjvInternal(interp, objc, objv, command, length, flags)
     /*
      * Finally, invoke the command's Tcl_ObjCmdProc.
      */
+
     cmdPtr->refCount++;
     iPtr->cmdCount++;
     if (code == TCL_OK && traceCode == TCL_OK && !Tcl_LimitExceeded(interp)) {
@@ -3360,6 +3367,7 @@ TclEvalObjvInternal(interp, objc, objv, command, length, flags)
     /*
      * Call 'leave' command traces
      */
+
     if (!(cmdPtr->flags & CMD_IS_DELETED)) {
 	if ((cmdPtr->flags & CMD_HAS_EXEC_TRACES) && (traceCode == TCL_OK)) {
 	    traceCode = TclCheckExecutionTraces(interp, command, length,
@@ -3373,10 +3381,9 @@ TclEvalObjvInternal(interp, objc, objv, command, length, flags)
     TclCleanupCommand(cmdPtr);
 
     /*
-     * If one of the trace invocation resulted in error, then 
-     * change the result code accordingly. Note, that the
-     * interp->result should already be set correctly by the
-     * call to TraceExecutionProc.  
+     * If one of the trace invocation resulted in error, then change the
+     * result code accordingly. Note, that the interp->result should already
+     * be set correctly by the call to TraceExecutionProc.
      */
 
     if (traceCode != TCL_OK) {
@@ -3384,17 +3391,17 @@ TclEvalObjvInternal(interp, objc, objv, command, length, flags)
     }
 
     /*
-     * If the interpreter has a non-empty string result, the result
-     * object is either empty or stale because some procedure set
-     * interp->result directly. If so, move the string result to the
-     * result object, then reset the string result.
+     * If the interpreter has a non-empty string result, the result object is
+     * either empty or stale because some procedure set interp->result
+     * directly. If so, move the string result to the result object, then
+     * reset the string result.
      */
 
     if (*(iPtr->result) != 0) {
 	(void) Tcl_GetObjResult(interp);
     }
 
-    done:
+  done:
     return code;
 }
 
@@ -3403,13 +3410,12 @@ TclEvalObjvInternal(interp, objc, objv, command, length, flags)
  *
  * Tcl_EvalObjv --
  *
- *	This procedure evaluates a Tcl command that has already been
- *	parsed into words, with one Tcl_Obj holding each word.
+ *	This procedure evaluates a Tcl command that has already been parsed
+ *	into words, with one Tcl_Obj holding each word.
  *
  * Results:
- *	The return value is a standard Tcl completion code such as
- *	TCL_OK or TCL_ERROR.  A result or error message is left in
- *	interp's result.
+ *	The return value is a standard Tcl completion code such as TCL_OK or
+ *	TCL_ERROR. A result or error message is left in interp's result.
  *
  * Side effects:
  *	Depends on the command.
@@ -3420,15 +3426,14 @@ TclEvalObjvInternal(interp, objc, objv, command, length, flags)
 int
 Tcl_EvalObjv(interp, objc, objv, flags)
     Tcl_Interp *interp;		/* Interpreter in which to evaluate the
-				 * command.  Also used for error
-				 * reporting. */
+				 * command. Also used for error reporting. */
     int objc;			/* Number of words in command. */
     Tcl_Obj *CONST objv[];	/* An array of pointers to objects that are
 				 * the words that make up the command. */
-    int flags;			/* Collection of OR-ed bits that control
-				 * the evaluation of the script.  Only
-				 * TCL_EVAL_GLOBAL and TCL_EVAL_INVOKE
-				 * are  currently supported. */
+    int flags;			/* Collection of OR-ed bits that control the
+				 * evaluation of the script. Only
+				 * TCL_EVAL_GLOBAL and TCL_EVAL_INVOKE are
+				 * currently supported. */
 {
     Interp *iPtr = (Interp *)interp;
     Trace *tracePtr;
@@ -3446,7 +3451,7 @@ Tcl_EvalObjv(interp, objc, objv, flags)
     for (tracePtr = iPtr->tracePtr; tracePtr; tracePtr = tracePtr->nextPtr) {
 	if ((tracePtr->level == 0) || (iPtr->numLevels <= tracePtr->level)) {
 	    /*
-	     * The command may be needed for an execution trace.  Generate a
+	     * The command may be needed for an execution trace. Generate a
 	     * command string.
 	     */
 
@@ -3465,8 +3470,8 @@ Tcl_EvalObjv(interp, objc, objv, flags)
     iPtr->numLevels--;
 
     /*
-     * If we are again at the top level, process any unusual 
-     * return code returned by the evaluated code. 
+     * If we are again at the top level, process any unusual return code
+     * returned by the evaluated code.
      */
 
     if (iPtr->numLevels == 0) {
@@ -3482,8 +3487,8 @@ Tcl_EvalObjv(interp, objc, objv, flags)
 
     if ((code == TCL_ERROR) && !(flags & TCL_EVAL_INVOKE)) {
 
-	/* 
-	 * If there was an error, a command string will be needed for the 
+	/*
+	 * If there was an error, a command string will be needed for the
 	 * error log: generate it now if it was not done previously.
 	 */
 
@@ -3509,16 +3514,16 @@ Tcl_EvalObjv(interp, objc, objv, flags)
  *
  * Tcl_LogCommandInfo --
  *
- *	This procedure is invoked after an error occurs in an interpreter.
- *	It adds information to iPtr->errorInfo field to describe the
- *	command that was being executed when the error occurred.
+ *	This procedure is invoked after an error occurs in an interpreter. It
+ *	adds information to iPtr->errorInfo field to describe the command that
+ *	was being executed when the error occurred.
  *
  * Results:
  *	None.
  *
  * Side effects:
- *	Information about the command is added to errorInfo and the
- *	line number stored internally in the interpreter is set.  
+ *	Information about the command is added to errorInfo and the line
+ *	number stored internally in the interpreter is set.
  *
  *----------------------------------------------------------------------
  */
@@ -3528,10 +3533,10 @@ Tcl_LogCommandInfo(interp, script, command, length)
     Tcl_Interp *interp;		/* Interpreter in which to log information. */
     CONST char *script;		/* First character in script containing
 				 * command (must be <= command). */
-    CONST char *command;	/* First character in command that
-				 * generated the error. */
-    int length;			/* Number of bytes in command (-1 means
-				 * use all bytes up to first null byte). */
+    CONST char *command;	/* First character in command that generated
+				 * the error. */
+    int length;			/* Number of bytes in command (-1 means use
+				 * all bytes up to first null byte). */
 {
     register CONST char *p;
     Interp *iPtr = (Interp *) interp;
@@ -3539,8 +3544,8 @@ Tcl_LogCommandInfo(interp, script, command, length)
 
     if (iPtr->flags & ERR_ALREADY_LOGGED) {
 	/*
-	 * Someone else has already logged error information for this
-	 * command; we shouldn't add anything more.
+	 * Someone else has already logged error information for this command;
+	 * we shouldn't add anything more.
 	 */
 
 	return;
@@ -3574,15 +3579,14 @@ Tcl_LogCommandInfo(interp, script, command, length)
  *
  * Tcl_EvalTokensStandard --
  *
- *	Given an array of tokens parsed from a Tcl command (e.g., the
- *	tokens that make up a word or the index for an array variable)
- *	this procedure evaluates the tokens and concatenates their
- *	values to form a single result value.
- * 
+ *	Given an array of tokens parsed from a Tcl command (e.g., the tokens
+ *	that make up a word or the index for an array variable) this procedure
+ *	evaluates the tokens and concatenates their values to form a single
+ *	result value.
+ *
  * Results:
- *	The return value is a standard Tcl completion code such as
- *	TCL_OK or TCL_ERROR.  A result or error message is left in
- *	interp's result.
+ *	The return value is a standard Tcl completion code such as TCL_OK or
+ *	TCL_ERROR. A result or error message is left in interp's result.
  *
  * Side effects:
  *	Depends on the array of tokens being evaled.
@@ -3592,11 +3596,11 @@ Tcl_LogCommandInfo(interp, script, command, length)
 
 int
 Tcl_EvalTokensStandard(interp, tokenPtr, count)
-    Tcl_Interp *interp;		/* Interpreter in which to lookup
-				 * variables, execute nested commands,
-				 * and report errors. */
-    Tcl_Token *tokenPtr;	/* Pointer to first in an array of tokens
-				 * to evaluate and concatenate. */
+    Tcl_Interp *interp;		/* Interpreter in which to lookup variables,
+				 * execute nested commands, and report
+				 * errors. */
+    Tcl_Token *tokenPtr;	/* Pointer to first in an array of tokens to
+				 * evaluate and concatenate. */
     int count;			/* Number of tokens to consider at tokenPtr.
 				 * Must be at least 1. */
 {
@@ -3609,35 +3613,35 @@ Tcl_EvalTokensStandard(interp, tokenPtr, count)
  *
  * Tcl_EvalTokens --
  *
- *	Given an array of tokens parsed from a Tcl command (e.g., the
- *	tokens that make up a word or the index for an array variable)
- *	this procedure evaluates the tokens and concatenates their
- *	values to form a single result value.
+ *	Given an array of tokens parsed from a Tcl command (e.g., the tokens
+ *	that make up a word or the index for an array variable) this procedure
+ *	evaluates the tokens and concatenates their values to form a single
+ *	result value.
  *
  * Results:
- *	The return value is a pointer to a newly allocated Tcl_Obj
- *	containing the value of the array of tokens.  The reference
- *	count of the returned object has been incremented.  If an error
- *	occurs in evaluating the tokens then a NULL value is returned
- *	and an error message is left in interp's result.
+ *	The return value is a pointer to a newly allocated Tcl_Obj containing
+ *	the value of the array of tokens. The reference count of the returned
+ *	object has been incremented. If an error occurs in evaluating the
+ *	tokens then a NULL value is returned and an error message is left in
+ *	interp's result.
  *
  * Side effects:
  *	A new object is allocated to hold the result.
  *
  *----------------------------------------------------------------------
  *
- * This uses a non-standard return convention; its use is now deprecated.
- * It is a wrapper for the new function Tcl_EvalTokensStandard, and is not 
- * used in the core any longer. It is only kept for backward compatibility.
+ * This uses a non-standard return convention; its use is now deprecated. It
+ * is a wrapper for the new function Tcl_EvalTokensStandard, and is not used
+ * in the core any longer. It is only kept for backward compatibility.
  */
 
 Tcl_Obj *
 Tcl_EvalTokens(interp, tokenPtr, count)
-    Tcl_Interp *interp;		/* Interpreter in which to lookup
-				 * variables, execute nested commands,
-				 * and report errors. */
-    Tcl_Token *tokenPtr;	/* Pointer to first in an array of tokens
-				 * to evaluate and concatenate. */
+    Tcl_Interp *interp;		/* Interpreter in which to lookup variables,
+				 * execute nested commands, and report
+				 * errors. */
+    Tcl_Token *tokenPtr;	/* Pointer to first in an array of tokens to
+				 * evaluate and concatenate. */
     int count;			/* Number of tokens to consider at tokenPtr.
 				 * Must be at least 1. */
 {
@@ -3661,15 +3665,14 @@ Tcl_EvalTokens(interp, tokenPtr, count)
  *
  * Tcl_EvalEx --
  *
- *	This procedure evaluates a Tcl script without using the compiler
- *	or byte-code interpreter.  It just parses the script, creates
- *	values for each word of each command, then calls EvalObjv
- *	to execute each command.
+ *	This procedure evaluates a Tcl script without using the compiler or
+ *	byte-code interpreter. It just parses the script, creates values for
+ *	each word of each command, then calls EvalObjv to execute each
+ *	command.
  *
  * Results:
- *	The return value is a standard Tcl completion code such as
- *	TCL_OK or TCL_ERROR.  A result or error message is left in
- *	interp's result.
+ *	The return value is a standard Tcl completion code such as TCL_OK or
+ *	TCL_ERROR. A result or error message is left in interp's result.
  *
  * Side effects:
  *	Depends on the script.
@@ -3680,15 +3683,14 @@ Tcl_EvalTokens(interp, tokenPtr, count)
 int
 Tcl_EvalEx(interp, script, numBytes, flags)
     Tcl_Interp *interp;		/* Interpreter in which to evaluate the
-				 * script.  Also used for error reporting. */
+				 * script. Also used for error reporting. */
     CONST char *script;		/* First character of script to evaluate. */
-    int numBytes;		/* Number of bytes in script.  If < 0, the
+    int numBytes;		/* Number of bytes in script. If < 0, the
 				 * script consists of all bytes up to the
 				 * first null character. */
-    int flags;			/* Collection of OR-ed bits that control
-				 * the evaluation of the script.  Only
-				 * TCL_EVAL_GLOBAL is currently
-				 * supported. */
+    int flags;			/* Collection of OR-ed bits that control the
+				 * evaluation of the script. Only
+				 * TCL_EVAL_GLOBAL is currently supported. */
 {
     Interp *iPtr = (Interp *) interp;
     CONST char *p, *next;
@@ -3698,14 +3700,14 @@ Tcl_EvalEx(interp, script, numBytes, flags)
     int expandStatic[NUM_STATIC_OBJS], *expand;
     Tcl_Token *tokenPtr;
     int i, code, commandLength, bytesLeft, expandRequested;
-    CallFrame *savedVarFramePtr;   /* Saves old copy of iPtr->varFramePtr
-				    * in case TCL_EVAL_GLOBAL was set. */
+    CallFrame *savedVarFramePtr;/* Saves old copy of iPtr->varFramePtr in case
+				 * TCL_EVAL_GLOBAL was set. */
     int allowExceptions = (iPtr->evalFlags & TCL_ALLOW_EXCEPTIONS);
 
     /*
-     * The variables below keep track of how much state has been
-     * allocated while evaluating the script, so that it can be freed
-     * properly if an error occurs.
+     * The variables below keep track of how much state has been allocated
+     * while evaluating the script, so that it can be freed properly if an
+     * error occurs.
      */
 
     int gotParse = 0, objectsUsed = 0;
@@ -3721,8 +3723,8 @@ Tcl_EvalEx(interp, script, numBytes, flags)
     }
 
     /*
-     * Each iteration through the following loop parses the next
-     * command from the script and then executes it.
+     * Each iteration through the following loop parses the next command from
+     * the script and then executes it.
      */
 
     objv = objvSpace = staticObjArray;
@@ -3735,25 +3737,26 @@ Tcl_EvalEx(interp, script, numBytes, flags)
 	    code = TCL_ERROR;
 	    goto error;
 	}
-	gotParse = 1; 
+	gotParse = 1;
 	if (parse.numWords > 0) {
 	    /*
 	     * Generate an array of objects for the words of the command.
 	     */
+
 	    int objectsNeeded = 0;
 
 	    if (parse.numWords > NUM_STATIC_OBJS) {
-		expand = (int *) ckalloc((unsigned)
-			(parse.numWords * sizeof(int)));
-		objvSpace = (Tcl_Obj **) ckalloc((unsigned)
-			(parse.numWords * sizeof(Tcl_Obj *)));
+		expand = (int *)
+			ckalloc((unsigned) (parse.numWords * sizeof(int)));
+		objvSpace = (Tcl_Obj **)
+			ckalloc((unsigned) (parse.numWords*sizeof(Tcl_Obj *)));
 	    }
 	    expandRequested = 0;
 	    objv = objvSpace;
 	    for (objectsUsed = 0, tokenPtr = parse.tokenPtr;
 		    objectsUsed < parse.numWords;
 		    objectsUsed++, tokenPtr += (tokenPtr->numComponents + 1)) {
-		code = TclSubstTokens(interp, tokenPtr+1, 
+		code = TclSubstTokens(interp, tokenPtr+1,
 			tokenPtr->numComponents, NULL);
 		if (code != TCL_OK) {
 		    goto error;
@@ -3766,9 +3769,13 @@ Tcl_EvalEx(interp, script, numBytes, flags)
 		    code = Tcl_ListObjLength(interp,
 			    objv[objectsUsed], &numElements);
 		    if (code == TCL_ERROR) {
-			/* Attempt to expand a non-list */
+			/*
+			 * Attempt to expand a non-list.
+			 */
+
 			Tcl_Obj *msg;
 			Tcl_Obj *wordNum;
+
 			msg = Tcl_NewStringObj("\n    (expanding word ", -1);
 			TclNewIntObj(wordNum, objectsUsed);
 			Tcl_IncrRefCount(wordNum);
@@ -3790,7 +3797,10 @@ Tcl_EvalEx(interp, script, numBytes, flags)
 		}
 	    }
 	    if (expandRequested) {
-		/* Some word expansion was requested.  Check for objv resize */
+		/*
+		 * Some word expansion was requested. Check for objv resize.
+		 */
+
 		Tcl_Obj **copy = objvSpace;
 		int wordIdx = parse.numWords;
 		int objIdx = objectsNeeded - 1;
@@ -3806,6 +3816,7 @@ Tcl_EvalEx(interp, script, numBytes, flags)
 		    if (expand[wordIdx]) {
 			int numElements;
 			Tcl_Obj **elements, *temp = copy[wordIdx];
+
 			Tcl_ListObjGetElements(NULL, temp,
 				&numElements, &elements);
 			objectsUsed += numElements;
@@ -3830,8 +3841,8 @@ Tcl_EvalEx(interp, script, numBytes, flags)
 	     * Execute the command and free the objects for its words.
 	     */
 
-	    iPtr->numLevels++;    
-	    code = TclEvalObjvInternal(interp, objectsUsed, objv, 
+	    iPtr->numLevels++;
+	    code = TclEvalObjvInternal(interp, objectsUsed, objv,
 		    parse.commandStart, parse.commandSize, 0);
 	    iPtr->numLevels--;
 	    if (code != TCL_OK) {
@@ -3845,10 +3856,12 @@ Tcl_EvalEx(interp, script, numBytes, flags)
 		ckfree((char *) objvSpace);
 		objvSpace = staticObjArray;
 	    }
-	    /* 
+
+	    /*
 	     * Free expand separately since objvSpace could have been
-	     * reallocated above. 
+	     * reallocated above.
 	     */
+
 	    if (expand != expandStatic) {
 		ckfree((char *) expand);
 		expand = expandStatic;
@@ -3868,18 +3881,20 @@ Tcl_EvalEx(interp, script, numBytes, flags)
     iPtr->varFramePtr = savedVarFramePtr;
     return TCL_OK;
 
-    error:
-    /* Generate and log various pieces of error information. */
-	if (iPtr->numLevels == 0) {
-	    if (code == TCL_RETURN) {
-		code = TclUpdateReturnInfo(iPtr);
-	    }
-	    if ((code != TCL_OK) && (code != TCL_ERROR) && !allowExceptions) {
-		ProcessUnexpectedResult(interp, code);
-		code = TCL_ERROR;
-	    }
+  error:
+    /*
+     * Generate and log various pieces of error information.
+     */
+    if (iPtr->numLevels == 0) {
+	if (code == TCL_RETURN) {
+	    code = TclUpdateReturnInfo(iPtr);
+	}
+	if ((code != TCL_OK) && (code != TCL_ERROR) && !allowExceptions) {
+	    ProcessUnexpectedResult(interp, code);
+	    code = TCL_ERROR;
 	}
-    if ((code == TCL_ERROR) && !(iPtr->flags & ERR_ALREADY_LOGGED)) { 
+    }
+    if ((code == TCL_ERROR) && !(iPtr->flags & ERR_ALREADY_LOGGED)) {
 	commandLength = parse.commandSize;
 	if (parse.term == parse.commandStart + commandLength - 1) {
 	    /*
@@ -3895,7 +3910,9 @@ Tcl_EvalEx(interp, script, numBytes, flags)
     }
     iPtr->flags &= ~ERR_ALREADY_LOGGED;
 
-    /* Then free resources that had been allocated to the command. */
+    /*
+     * Then free resources that had been allocated to the command.
+     */
 
     for (i = 0; i < objectsUsed; i++) {
 	Tcl_DecrRefCount(objv[i]);
@@ -3918,18 +3935,16 @@ Tcl_EvalEx(interp, script, numBytes, flags)
  *
  * Tcl_Eval --
  *
- *	Execute a Tcl command in a string.  This procedure executes the
- *	script directly, rather than compiling it to bytecodes.  Before
- *	the arrival of the bytecode compiler in Tcl 8.0 Tcl_Eval was
- *	the main procedure used for executing Tcl commands, but nowadays
- *	it isn't used much.
+ *	Execute a Tcl command in a string. This procedure executes the script
+ *	directly, rather than compiling it to bytecodes. Before the arrival of
+ *	the bytecode compiler in Tcl 8.0 Tcl_Eval was the main procedure used
+ *	for executing Tcl commands, but nowadays it isn't used much.
  *
  * Results:
- *	The return value is one of the return codes defined in tcl.h
- *	(such as TCL_OK), and interp's result contains a value
- *	to supplement the return code. The value of the result
- *	will persist only until the next call to Tcl_Eval or Tcl_EvalObj:
- *	you must copy it or lose it!
+ *	The return value is one of the return codes defined in tcl.h (such as
+ *	TCL_OK), and interp's result contains a value to supplement the return
+ *	code. The value of the result will persist only until the next call to
+ *	Tcl_Eval or Tcl_EvalObj: you must copy it or lose it!
  *
  * Side effects:
  *	Can be almost arbitrary, depending on the commands in the script.
@@ -3939,16 +3954,16 @@ Tcl_EvalEx(interp, script, numBytes, flags)
 
 int
 Tcl_Eval(interp, script)
-    Tcl_Interp *interp;		/* Token for command interpreter (returned
-				 * by previous call to Tcl_CreateInterp). */
+    Tcl_Interp *interp;		/* Token for command interpreter (returned by
+				 * previous call to Tcl_CreateInterp). */
     CONST char *script;		/* Pointer to TCL command to execute. */
 {
     int code = Tcl_EvalEx(interp, script, -1, 0);
 
     /*
-     * For backwards compatibility with old C code that predates the
-     * object system in Tcl 8.0, we have to mirror the object result
-     * back into the string result (some callers may expect it there).
+     * For backwards compatibility with old C code that predates the object
+     * system in Tcl 8.0, we have to mirror the object result back into the
+     * string result (some callers may expect it there).
      */
 
     (void) Tcl_GetStringResult(interp);
@@ -3996,42 +4011,38 @@ Tcl_GlobalEvalObj(interp, objPtr)
  * Tcl_EvalObjEx --
  *
  *	Execute Tcl commands stored in a Tcl object. These commands are
- *	compiled into bytecodes if necessary, unless TCL_EVAL_DIRECT
- *	is specified.
+ *	compiled into bytecodes if necessary, unless TCL_EVAL_DIRECT is
+ *	specified.
  *
  * Results:
- *	The return value is one of the return codes defined in tcl.h
- *	(such as TCL_OK), and the interpreter's result contains a value
- *	to supplement the return code.
+ *	The return value is one of the return codes defined in tcl.h (such as
+ *	TCL_OK), and the interpreter's result contains a value to supplement
+ *	the return code.
  *
  * Side effects:
- *	The object is converted, if necessary, to a ByteCode object that
- *	holds the bytecode instructions for the commands. Executing the
- *	commands will almost certainly have side effects that depend
- *	on those commands.
+ *	The object is converted, if necessary, to a ByteCode object that holds
+ *	the bytecode instructions for the commands. Executing the commands
+ *	will almost certainly have side effects that depend on those commands.
  *
  *----------------------------------------------------------------------
  */
 
 int
 Tcl_EvalObjEx(interp, objPtr, flags)
-    Tcl_Interp *interp;			/* Token for command interpreter
-					 * (returned by a previous call to
-					 * Tcl_CreateInterp). */
-    register Tcl_Obj *objPtr;		/* Pointer to object containing
-					 * commands to execute. */
-    int flags;				/* Collection of OR-ed bits that
-					 * control the evaluation of the
-					 * script.  Supported values are
-					 * TCL_EVAL_GLOBAL and
-					 * TCL_EVAL_DIRECT. */
+    Tcl_Interp *interp;		/* Token for command interpreter (returned by
+				 * a previous call to Tcl_CreateInterp). */
+    register Tcl_Obj *objPtr;	/* Pointer to object containing commands to
+				 * execute. */
+    int flags;			/* Collection of OR-ed bits that control the
+				 * evaluation of the script. Supported values
+				 * are TCL_EVAL_GLOBAL and TCL_EVAL_DIRECT. */
 {
     register Interp *iPtr = (Interp *) interp;
     char *script;
     int numSrcBytes;
     int result;
-    CallFrame *savedVarFramePtr;	/* Saves old copy of iPtr->varFramePtr
-					 * in case TCL_EVAL_GLOBAL was set. */
+    CallFrame *savedVarFramePtr;/* Saves old copy of iPtr->varFramePtr in case
+				 * TCL_EVAL_GLOBAL was set. */
     int allowExceptions = (iPtr->evalFlags & TCL_ALLOW_EXCEPTIONS);
 
     Tcl_IncrRefCount(objPtr);
@@ -4039,46 +4050,58 @@ Tcl_EvalObjEx(interp, objPtr, flags)
     if (flags & TCL_EVAL_DIRECT) {
 	/*
 	 * We're not supposed to use the compiler or byte-code interpreter.
-	 * Let Tcl_EvalEx evaluate the command directly (and probably
-	 * more slowly).
+	 * Let Tcl_EvalEx evaluate the command directly (and probably more
+	 * slowly).
 	 *
-	 * Pure List Optimization (no string representation).  In this
-	 * case, we can safely use Tcl_EvalObjv instead and get an
-	 * appreciable improvement in execution speed.  This is because it
-	 * allows us to avoid a setFromAny step that would just pack
-	 * everything into a string and back out again.
+	 * Pure List Optimization (no string representation). In this case, we
+	 * can safely use Tcl_EvalObjv instead and get an appreciable
+	 * improvement in execution speed. This is because it allows us to
+	 * avoid a setFromAny step that would just pack everything into a
+	 * string and back out again.
+	 *
+	 * This restriction has been relaxed a bit by storing in lists whether
+	 * they are "canonical" or not (a canonical list being one that is
+	 * either pure or that has its string rep derived by
+	 * UpdateStringOfList from the internal rep).
 	 */
-	if ((objPtr->typePtr == &tclListType) && /* is a list... */
-		(objPtr->bytes == NULL) /* ...without a string rep */) {	    
-	    List *listRepPtr;
 
-	    /*
-	     * Increase the reference count of the List structure, to avoid a
-	     * segfault if objPtr loses its List internal rep [Bug 1119369]
-	     */
+	if (objPtr->typePtr == &tclListType) {	/* is a list... */
+	    List *listRepPtr;
 
 	    listRepPtr = (List *) objPtr->internalRep.twoPtrValue.ptr1;
-	    listRepPtr->refCount++;
 
-	    result = Tcl_EvalObjv(interp, listRepPtr->elemCount,
-		    &listRepPtr->elements, flags);
+	    if (objPtr->bytes == NULL ||	/* ...without a string rep */
+		    listRepPtr->canonicalFlag) {/* ...or that is canonical */
 
-	    /*
-	     * If we are the last users of listRepPtr, free it.
-	     */
+		/*
+		 * Increase the reference count of the List structure, to
+		 * avoid a segfault if objPtr loses its List internal rep [Bug
+		 * 1119369]
+		 */
+
+		listRepPtr->refCount++;
+
+		result = Tcl_EvalObjv(interp, listRepPtr->elemCount,
+			&listRepPtr->elements, flags);
+
+		/*
+		 * If we are the last users of listRepPtr, free it.
+		 */
 
-	    if (--listRepPtr->refCount <= 0) {
-		int i, elemCount = listRepPtr->elemCount;
-		Tcl_Obj **elements = &listRepPtr->elements;
-		for (i=0; i<elemCount; i++) {
-		    Tcl_DecrRefCount(elements[i]);
+		if (--listRepPtr->refCount <= 0) {
+		    int i, elemCount = listRepPtr->elemCount;
+		    Tcl_Obj **elements = &listRepPtr->elements;
+
+		    for (i=0; i<elemCount; i++) {
+			Tcl_DecrRefCount(elements[i]);
+		    }
+		    ckfree((char *) listRepPtr);
 		}
-		ckfree((char *) listRepPtr);
+		goto done;
 	    }
-	} else {
-	    script = Tcl_GetStringFromObj(objPtr, &numSrcBytes);
-	    result = Tcl_EvalEx(interp, script, numSrcBytes, flags);
 	}
+	script = Tcl_GetStringFromObj(objPtr, &numSrcBytes);
+	result = Tcl_EvalEx(interp, script, numSrcBytes, flags);
     } else {
 	/*
 	 * Let the compiler/engine subsystem do the evaluation.
@@ -4092,15 +4115,15 @@ Tcl_EvalObjEx(interp, objPtr, flags)
 	result = TclCompEvalObj(interp, objPtr);
 
 	/*
-	 * If we are again at the top level, process any unusual 
-	 * return code returned by the evaluated code. 
+	 * If we are again at the top level, process any unusual return code
+	 * returned by the evaluated code.
 	 */
 
 	if (iPtr->numLevels == 0) {
 	    if (result == TCL_RETURN) {
 		result = TclUpdateReturnInfo(iPtr);
 	    }
-	    if ((result != TCL_OK) && (result != TCL_ERROR) 
+	    if ((result != TCL_OK) && (result != TCL_ERROR)
 		    && !allowExceptions) {
 		ProcessUnexpectedResult(interp, result);
 		result = TCL_ERROR;
@@ -4109,9 +4132,10 @@ Tcl_EvalObjEx(interp, objPtr, flags)
 	    }
 	}
 	iPtr->evalFlags = 0;
-	iPtr->varFramePtr = savedVarFramePtr; 
+	iPtr->varFramePtr = savedVarFramePtr;
     }
 
+  done:
     TclDecrRefCount(objPtr);
     return result;
 }
@@ -4121,17 +4145,17 @@ Tcl_EvalObjEx(interp, objPtr, flags)
  *
  * ProcessUnexpectedResult --
  *
- *	Procedure called by Tcl_EvalObj to set the interpreter's result
- *	value to an appropriate error message when the code it evaluates
- *	returns an unexpected result code (not TCL_OK and not TCL_ERROR) to
- *	the topmost evaluation level.
+ *	Procedure called by Tcl_EvalObj to set the interpreter's result value
+ *	to an appropriate error message when the code it evaluates returns an
+ *	unexpected result code (not TCL_OK and not TCL_ERROR) to the topmost
+ *	evaluation level.
  *
  * Results:
  *	None.
  *
  * Side effects:
- *	The interpreter result is set to an error message appropriate to
- *	the result code.
+ *	The interpreter result is set to an error message appropriate to the
+ *	result code.
  *
  *----------------------------------------------------------------------
  */
@@ -4168,9 +4192,9 @@ ProcessUnexpectedResult(interp, returnCode)
  * Results:
  *	Each of the procedures below returns a standard Tcl result. If an
  *	error occurs then an error message is left in the interp's result.
- *	Otherwise the value of the expression, in the appropriate form,
- *	is stored at *ptr. If the expression had a result that was
- *	incompatible with the desired form then an error is returned.
+ *	Otherwise the value of the expression, in the appropriate form, is
+ *	stored at *ptr. If the expression had a result that was incompatible
+ *	with the desired form then an error is returned.
  *
  * Side effects:
  *	None.
@@ -4182,7 +4206,7 @@ int
 Tcl_ExprLong(interp, exprstring, ptr)
     Tcl_Interp *interp;		/* Context in which to evaluate the
 				 * expression. */
-    CONST char *exprstring;		/* Expression to evaluate. */
+    CONST char *exprstring;	/* Expression to evaluate. */
     long *ptr;			/* Where to store result. */
 {
     register Tcl_Obj *exprPtr;
@@ -4208,7 +4232,9 @@ Tcl_ExprLong(interp, exprstring, ptr)
 		/*
 		 * See Tcl_GetIntFromObj for conversion comments.
 		 */
+
 		Tcl_WideInt w = resultPtr->internalRep.wideValue;
+
 		if ((w >= -(Tcl_WideInt)(ULONG_MAX))
 			&& (w <= (Tcl_WideInt)(ULONG_MAX))) {
 		    *ptr = Tcl_WideAsLong(w);
@@ -4226,16 +4252,16 @@ Tcl_ExprLong(interp, exprstring, ptr)
 			"expression didn't have numeric value", TCL_STATIC);
 		result = TCL_ERROR;
 	    }
-	    Tcl_DecrRefCount(resultPtr);  /* discard the result object */
+	    Tcl_DecrRefCount(resultPtr);/* discard the result object */
 	} else {
 	    /*
-	     * Move the interpreter's object result to the string result, 
-	     * then reset the object result.
+	     * Move the interpreter's object result to the string result, then
+	     * reset the object result.
 	     */
 
 	    (void) Tcl_GetStringResult(interp);
 	}
-	Tcl_DecrRefCount(exprPtr);  /* discard the expression object */	
+	Tcl_DecrRefCount(exprPtr);	/* discard the expression object */
     } else {
 	/*
 	 * An empty string. Just set the result integer to 0.
@@ -4250,7 +4276,7 @@ int
 Tcl_ExprDouble(interp, exprstring, ptr)
     Tcl_Interp *interp;		/* Context in which to evaluate the
 				 * expression. */
-    CONST char *exprstring;		/* Expression to evaluate. */
+    CONST char *exprstring;	/* Expression to evaluate. */
     double *ptr;		/* Where to store result. */
 {
     register Tcl_Obj *exprPtr;
@@ -4264,7 +4290,7 @@ Tcl_ExprDouble(interp, exprstring, ptr)
 	result = Tcl_ExprObj(interp, exprPtr, &resultPtr);
 	if (result == TCL_OK) {
 	    /*
-	     * Store a double  based on the expression result.
+	     * Store a double based on the expression result.
 	     */
 
 	    if (resultPtr->typePtr == &tclIntType) {
@@ -4276,7 +4302,9 @@ Tcl_ExprDouble(interp, exprstring, ptr)
 		/*
 		 * See Tcl_GetIntFromObj for conversion comments.
 		 */
+
 		Tcl_WideInt w = resultPtr->internalRep.wideValue;
+
 		if ((w >= -(Tcl_WideInt)(ULONG_MAX))
 			&& (w <= (Tcl_WideInt)(ULONG_MAX))) {
 		    *ptr = (double) Tcl_WideAsLong(w);
@@ -4294,16 +4322,16 @@ Tcl_ExprDouble(interp, exprstring, ptr)
 			"expression didn't have numeric value", TCL_STATIC);
 		result = TCL_ERROR;
 	    }
-	    Tcl_DecrRefCount(resultPtr);  /* discard the result object */
+	    Tcl_DecrRefCount(resultPtr);/* discard the result object */
 	} else {
 	    /*
-	     * Move the interpreter's object result to the string result, 
-	     * then reset the object result.
+	     * Move the interpreter's object result to the string result, then
+	     * reset the object result.
 	     */
 
 	    (void) Tcl_GetStringResult(interp);
 	}
-	Tcl_DecrRefCount(exprPtr);  /* discard the expression object */
+	Tcl_DecrRefCount(exprPtr);	/* discard the expression object */
     } else {
 	/*
 	 * An empty string. Just set the result double to 0.0.
@@ -4331,13 +4359,14 @@ Tcl_ExprBoolean(interp, exprstring, ptr)
     } else {
 	int result;
 	Tcl_Obj *exprPtr = Tcl_NewStringObj(exprstring, -1);
+
 	Tcl_IncrRefCount(exprPtr);
 	result = Tcl_ExprBooleanObj(interp, exprPtr, ptr);
 	Tcl_DecrRefCount(exprPtr);
 	if (result != TCL_OK) {
 	    /*
-	     * Move the interpreter's object result to the string result, 
-	     * then reset the object result.
+	     * Move the interpreter's object result to the string result, then
+	     * reset the object result.
 	     */
 
 	    (void) Tcl_GetStringResult(interp);
@@ -4351,16 +4380,15 @@ Tcl_ExprBoolean(interp, exprstring, ptr)
  *
  * Tcl_ExprLongObj, Tcl_ExprDoubleObj, Tcl_ExprBooleanObj --
  *
- *	Procedures to evaluate an expression in an object and return its
- *	value in a particular form.
+ *	Procedures to evaluate an expression in an object and return its value
+ *	in a particular form.
  *
  * Results:
- *	Each of the procedures below returns a standard Tcl result
- *	object. If an error occurs then an error message is left in the
- *	interpreter's result. Otherwise the value of the expression, in the
- *	appropriate form, is stored at *ptr. If the expression had a result
- *	that was incompatible with the desired form then an error is
- *	returned.
+ *	Each of the procedures below returns a standard Tcl result object. If
+ *	an error occurs then an error message is left in the interpreter's
+ *	result. Otherwise the value of the expression, in the appropriate
+ *	form, is stored at *ptr. If the expression had a result that was
+ *	incompatible with the desired form then an error is returned.
  *
  * Side effects:
  *	None.
@@ -4370,10 +4398,10 @@ Tcl_ExprBoolean(interp, exprstring, ptr)
 
 int
 Tcl_ExprLongObj(interp, objPtr, ptr)
-    Tcl_Interp *interp;			/* Context in which to evaluate the
-					 * expression. */
-    register Tcl_Obj *objPtr;		/* Expression to evaluate. */
-    long *ptr;				/* Where to store long result. */
+    Tcl_Interp *interp;		/* Context in which to evaluate the
+				 * expression. */
+    register Tcl_Obj *objPtr;	/* Expression to evaluate. */
+    long *ptr;			/* Where to store long result. */
 {
     Tcl_Obj *resultPtr;
     int result;
@@ -4397,10 +4425,10 @@ Tcl_ExprLongObj(interp, objPtr, ptr)
 
 int
 Tcl_ExprDoubleObj(interp, objPtr, ptr)
-    Tcl_Interp *interp;			/* Context in which to evaluate the
-					 * expression. */
-    register Tcl_Obj *objPtr;		/* Expression to evaluate. */
-    double *ptr;			/* Where to store double result. */
+    Tcl_Interp *interp;		/* Context in which to evaluate the
+				 * expression. */
+    register Tcl_Obj *objPtr;	/* Expression to evaluate. */
+    double *ptr;		/* Where to store double result. */
 {
     Tcl_Obj *resultPtr;
     int result;
@@ -4424,10 +4452,10 @@ Tcl_ExprDoubleObj(interp, objPtr, ptr)
 
 int
 Tcl_ExprBooleanObj(interp, objPtr, ptr)
-    Tcl_Interp *interp;			/* Context in which to evaluate the
-					 * expression. */
-    register Tcl_Obj *objPtr;		/* Expression to evaluate. */
-    int *ptr;				/* Where to store 0/1 result. */
+    Tcl_Interp *interp;		/* Context in which to evaluate the
+				 * expression. */
+    register Tcl_Obj *objPtr;	/* Expression to evaluate. */
+    int *ptr;			/* Where to store 0/1 result. */
 {
     Tcl_Obj *resultPtr;
     int result;
@@ -4445,12 +4473,11 @@ Tcl_ExprBooleanObj(interp, objPtr, ptr)
  *
  * TclObjInvokeNamespace --
  *
- *	Object version: Invokes a Tcl command, given an objv/objc, from
- *	either the exposed or hidden set of commands in the given
- *	interpreter.
+ *	Object version: Invokes a Tcl command, given an objv/objc, from either
+ *	the exposed or hidden set of commands in the given interpreter.
  *	NOTE: The command is invoked in the global stack frame of the
- *	interpreter or namespace, thus it cannot see any current state on
- *	the stack of that interpreter.
+ *	interpreter or namespace, thus it cannot see any current state on the
+ *	stack of that interpreter.
  *
  * Results:
  *	A standard Tcl result.
@@ -4469,17 +4496,16 @@ TclObjInvokeNamespace(interp, objc, objv, nsPtr, flags)
     Tcl_Obj *CONST objv[];	/* Argument objects; objv[0] points to the
 				 * name of the command to invoke. */
     Tcl_Namespace *nsPtr;	/* The namespace to use. */
-    int flags;			/* Combination of flags controlling the
-				 * call: TCL_INVOKE_HIDDEN,
-				 * TCL_INVOKE_NO_UNKNOWN, or
-				 * TCL_INVOKE_NO_TRACEBACK. */
+    int flags;			/* Combination of flags controlling the call:
+				 * TCL_INVOKE_HIDDEN, TCL_INVOKE_NO_UNKNOWN,
+				 * or TCL_INVOKE_NO_TRACEBACK. */
 {
     int result;
     Tcl_CallFrame *framePtr;
 
     /*
-     * Make the specified namespace the current namespace and invoke
-     * the command.
+     * Make the specified namespace the current namespace and invoke the
+     * command.
      */
 
     result = TclPushStackFrame(interp, &framePtr, nsPtr, /*isProcCallFrame*/ 0);
@@ -4498,8 +4524,8 @@ TclObjInvokeNamespace(interp, objc, objv, nsPtr, flags)
  *
  * TclObjInvoke --
  *
- *	Invokes a Tcl command, given an objv/objc, from either the
- *	exposed or the hidden sets of commands in the given interpreter.
+ *	Invokes a Tcl command, given an objv/objc, from either the exposed or
+ *	the hidden sets of commands in the given interpreter.
  *
  * Results:
  *	A standard Tcl object result.
@@ -4517,10 +4543,9 @@ TclObjInvoke(interp, objc, objv, flags)
     int objc;			/* Count of arguments. */
     Tcl_Obj *CONST objv[];	/* Argument objects; objv[0] points to the
 				 * name of the command to invoke. */
-    int flags;			/* Combination of flags controlling the
-				 * call: TCL_INVOKE_HIDDEN,
-				 * TCL_INVOKE_NO_UNKNOWN, or
-				 * TCL_INVOKE_NO_TRACEBACK. */
+    int flags;			/* Combination of flags controlling the call:
+				 * TCL_INVOKE_HIDDEN, TCL_INVOKE_NO_UNKNOWN,
+				 * or TCL_INVOKE_NO_TRACEBACK. */
 {
     register Interp *iPtr = (Interp *) interp;
     Tcl_HashTable *hTblPtr;	/* Table of hidden commands. */
@@ -4558,14 +4583,16 @@ TclObjInvoke(interp, objc, objv, flags)
     }
     cmdPtr = (Command *) Tcl_GetHashValue(hPtr);
 
-    /* Invoke the command procedure. */
+    /*
+     * Invoke the command procedure.
+     */
 
     iPtr->cmdCount++;
     result = (*cmdPtr->objProc)(cmdPtr->objClientData, interp, objc, objv);
 
     /*
-     * If an error occurred, record information about what was being
-     * executed when the error occurred.
+     * If an error occurred, record information about what was being executed
+     * when the error occurred.
      */
 
     if ((result == TCL_ERROR)
@@ -4574,6 +4601,7 @@ TclObjInvoke(interp, objc, objv, flags)
 	int length;
 	Tcl_Obj *command = Tcl_NewListObj(objc, objv);
 	CONST char* cmdString;
+
 	Tcl_IncrRefCount(command);
 	cmdString = Tcl_GetStringFromObj(command, &length);
 	Tcl_LogCommandInfo(interp, cmdString, cmdString, length);
@@ -4593,13 +4621,12 @@ TclObjInvoke(interp, objc, objv, flags)
  *
  * Results:
  *	A standard Tcl result. If the result is TCL_OK, then the interp's
- *	result is set to the string value of the expression. If the result
- *	is TCL_ERROR, then the interp's result contains an error message.
+ *	result is set to the string value of the expression. If the result is
+ *	TCL_ERROR, then the interp's result contains an error message.
  *
  * Side effects:
  *	A Tcl object is allocated to hold a copy of the expression string.
- *	This expression object is passed to Tcl_ExprObj and then
- *	deallocated.
+ *	This expression object is passed to Tcl_ExprObj and then deallocated.
  *
  *---------------------------------------------------------------------------
  */
@@ -4611,11 +4638,16 @@ Tcl_ExprString(interp, expr)
     CONST char *expr;		/* Expression to evaluate. */
 {
     int code = TCL_OK;
+
     if (expr[0] == '\0') {
-	/* An empty string.  Just set the interpreter's result to 0. */
+	/*
+	 * An empty string. Just set the interpreter's result to 0.
+	 */
+
 	Tcl_SetResult(interp, "0", TCL_VOLATILE);
     } else {
 	Tcl_Obj *resultPtr, *exprObj = Tcl_NewStringObj(expr, -1);
+
 	Tcl_IncrRefCount(exprObj);
 	code = Tcl_ExprObj(interp, exprObj, &resultPtr);
 	Tcl_DecrRefCount(exprObj);
@@ -4624,7 +4656,10 @@ Tcl_ExprString(interp, expr)
 	    Tcl_DecrRefCount(resultPtr);
 	}
 
-	/* Force the string rep of the interp result */
+	/*
+	 * Force the string rep of the interp result.
+	 */
+
 	(void) Tcl_GetStringResult(interp);
     }
     return code;
@@ -4635,16 +4670,16 @@ Tcl_ExprString(interp, expr)
  *
  * TclAppendObjToErrorInfo --
  *
- *	Add a Tcl_Obj value to the errorInfo field that describes the
- *	current error.
+ *	Add a Tcl_Obj value to the errorInfo field that describes the current
+ *	error.
  *
  * Results:
  *	None.
  *
  * Side effects:
- * 	The value of the Tcl_obj is appended to the errorInfo field.
- *	If we are just starting to log an error, errorInfo is initialized
- *	from the error message in the interpreter's result.
+ *	The value of the Tcl_obj is appended to the errorInfo field. If we are
+ *	just starting to log an error, errorInfo is initialized from the error
+ *	message in the interpreter's result.
  *
  *----------------------------------------------------------------------
  */
@@ -4657,6 +4692,7 @@ TclAppendObjToErrorInfo(interp, objPtr)
 {
     int length;
     CONST char *message = Tcl_GetStringFromObj(objPtr, &length);
+
     Tcl_AddObjErrorInfo(interp, message, length);
 }
 
@@ -4665,16 +4701,16 @@ TclAppendObjToErrorInfo(interp, objPtr)
  *
  * Tcl_AddErrorInfo --
  *
- *	Add information to the errorInfo field that describes the
- *	current error.
+ *	Add information to the errorInfo field that describes the current
+ *	error.
  *
  * Results:
  *	None.
  *
  * Side effects:
- *	The contents of message are appended to the errorInfo field.
- *	If we are just starting to log an error, errorInfo is initialized
- *	from the error message in the interpreter's result.
+ *	The contents of message are appended to the errorInfo field. If we are
+ *	just starting to log an error, errorInfo is initialized from the error
+ *	message in the interpreter's result.
  *
  *----------------------------------------------------------------------
  */
@@ -4693,18 +4729,18 @@ Tcl_AddErrorInfo(interp, message)
  *
  * Tcl_AddObjErrorInfo --
  *
- *	Add information to the errorInfo field that describes the
- *	current error. This routine differs from Tcl_AddErrorInfo by
- *	taking a byte pointer and length.
+ *	Add information to the errorInfo field that describes the current
+ *	error. This routine differs from Tcl_AddErrorInfo by taking a byte
+ *	pointer and length.
  *
  * Results:
  *	None.
  *
  * Side effects:
- *	"length" bytes from "message" are appended to the errorInfo field.
- *	If "length" is negative, use bytes up to the first NULL byte.
- *	If we are just starting to log an error, errorInfo is initialized
- *	from the error message in the interpreter's result.
+ *	"length" bytes from "message" are appended to the errorInfo field. If
+ *	"length" is negative, use bytes up to the first NULL byte. If we are
+ *	just starting to log an error, errorInfo is initialized from the error
+ *	message in the interpreter's result.
  *
  *----------------------------------------------------------------------
  */
@@ -4715,26 +4751,26 @@ Tcl_AddObjErrorInfo(interp, message, length)
 				 * pertains. */
     CONST char *message;	/* Points to the first byte of an array of
 				 * bytes of the message. */
-    int length;			/* The number of bytes in the message.
-				 * If < 0, then append all bytes up to a
-				 * NULL byte. */
+    int length;			/* The number of bytes in the message. If < 0,
+				 * then append all bytes up to a NULL byte. */
 {
     register Interp *iPtr = (Interp *) interp;
 
     /*
-     * If we are just starting to log an error, errorInfo is initialized
-     * from the error message in the interpreter's result.
+     * If we are just starting to log an error, errorInfo is initialized from
+     * the error message in the interpreter's result.
      */
 
     if (iPtr->errorInfo == NULL) { /* just starting to log error */
 	if (iPtr->result[0] != 0) {
 	    /*
-	     * The interp's string result is set, apparently by some
-	     * extension making a deprecated direct write to it.
-	     * That extension may expect interp->result to continue
-	     * to be set, so we'll take special pains to avoid clearing
-	     * it, until we drop support for interp->result completely.
+	     * The interp's string result is set, apparently by some extension
+	     * making a deprecated direct write to it. That extension may
+	     * expect interp->result to continue to be set, so we'll take
+	     * special pains to avoid clearing it, until we drop support for
+	     * interp->result completely.
 	     */
+
 	    iPtr->errorInfo = Tcl_NewStringObj(interp->result, -1);
 	} else {
 	    iPtr->errorInfo = iPtr->objResultPtr;
@@ -4764,12 +4800,12 @@ Tcl_AddObjErrorInfo(interp, message, length)
  *
  * Tcl_VarEvalVA --
  *
- *	Given a variable number of string arguments, concatenate them
- *	all together and execute the result as a Tcl command.
+ *	Given a variable number of string arguments, concatenate them all
+ *	together and execute the result as a Tcl command.
  *
  * Results:
- *	A standard Tcl return result.  An error message or other result may
- *	be left in the interp's result.
+ *	A standard Tcl return result. An error message or other result may be
+ *	left in the interp's result.
  *
  * Side effects:
  *	Depends on what was done by the command.
@@ -4787,10 +4823,9 @@ Tcl_VarEvalVA(interp, argList)
     int result;
 
     /*
-     * Copy the strings one after the other into a single larger
-     * string.  Use stack-allocated space for small commands, but if
-     * the command gets too large than call ckalloc to create the
-     * space.
+     * Copy the strings one after the other into a single larger string. Use
+     * stack-allocated space for small commands, but if the command gets too
+     * large than call ckalloc to create the space.
      */
 
     Tcl_DStringInit(&buf);
@@ -4812,12 +4847,12 @@ Tcl_VarEvalVA(interp, argList)
  *
  * Tcl_VarEval --
  *
- *	Given a variable number of string arguments, concatenate them
- *	all together and execute the result as a Tcl command.
+ *	Given a variable number of string arguments, concatenate them all
+ *	together and execute the result as a Tcl command.
  *
  * Results:
- *	A standard Tcl return result.  An error message or other
- *	result may be left in interp->result.
+ *	A standard Tcl return result. An error message or other result may be
+ *	left in interp->result.
  *
  * Side effects:
  *	Depends on what was done by the command.
@@ -4847,14 +4882,13 @@ Tcl_VarEval TCL_VARARGS_DEF(Tcl_Interp *,arg1)
  *	Evaluate a command at global level in an interpreter.
  *
  * Results:
- *	A standard Tcl result is returned, and the interp's result is
- *	modified accordingly.
+ *	A standard Tcl result is returned, and the interp's result is modified
+ *	accordingly.
  *
  * Side effects:
- *	The command string is executed in interp, and the execution
- *	is carried out in the variable context of global level (no
- *	procedures active), just as if an "uplevel #0" command were
- *	being executed.
+ *	The command string is executed in interp, and the execution is carried
+ *	out in the variable context of global level (no procedures active),
+ *	just as if an "uplevel #0" command were being executed.
  *
  ---------------------------------------------------------------------------
  */
@@ -4880,8 +4914,8 @@ Tcl_GlobalEval(interp, command)
  *
  * Tcl_SetRecursionLimit --
  *
- *	Set the maximum number of recursive calls that may be active
- *	for an interpreter at once.
+ *	Set the maximum number of recursive calls that may be active for an
+ *	interpreter at once.
  *
  * Results:
  *	The return value is the old limit on nesting for interp.
@@ -4894,9 +4928,9 @@ Tcl_GlobalEval(interp, command)
 
 int
 Tcl_SetRecursionLimit(interp, depth)
-    Tcl_Interp *interp;			/* Interpreter whose nesting limit
-					 * is to be set. */
-    int depth;				/* New value for maximimum depth. */
+    Tcl_Interp *interp;		/* Interpreter whose nesting limit is to be
+				 * set. */
+    int depth;			/* New value for maximimum depth. */
 {
     Interp *iPtr = (Interp *) interp;
     int old;
@@ -4913,17 +4947,15 @@ Tcl_SetRecursionLimit(interp, depth)
  *
  * Tcl_AllowExceptions --
  *
- *	Sets a flag in an interpreter so that exceptions can occur
- *	in the next call to Tcl_Eval without them being turned into
- *	errors.
+ *	Sets a flag in an interpreter so that exceptions can occur in the next
+ *	call to Tcl_Eval without them being turned into errors.
  *
  * Results:
  *	None.
  *
  * Side effects:
- *	The TCL_ALLOW_EXCEPTIONS flag gets set in the interpreter's
- *	evalFlags structure.  See the reference documentation for
- *	more details.
+ *	The TCL_ALLOW_EXCEPTIONS flag gets set in the interpreter's evalFlags
+ *	structure. See the reference documentation for more details.
  *
  *----------------------------------------------------------------------
  */
@@ -4936,16 +4968,15 @@ Tcl_AllowExceptions(interp)
 
     iPtr->evalFlags |= TCL_ALLOW_EXCEPTIONS;
 }
-
 
 /*
  *----------------------------------------------------------------------
  *
  * Tcl_GetVersion --
  *
- *	Get the Tcl major, minor, and patchlevel version numbers and
- *	the release type.  A patch is a release type TCL_FINAL_RELEASE
- *	with a patchLevel > 0.
+ *	Get the Tcl major, minor, and patchlevel version numbers and the
+ *	release type. A patch is a release type TCL_FINAL_RELEASE with a
+ *	patchLevel > 0.
  *
  * Results:
  *	None.
@@ -4982,13 +5013,13 @@ Tcl_GetVersion(majorV, minorV, patchLevelV, type)
  *
  * Math Functions --
  *
- *	This page contains the procedures that implement all of the
- *	built-in math functions for expressions.
+ *	This page contains the procedures that implement all of the built-in
+ *	math functions for expressions.
  *
  * Results:
- *	Each procedure returns TCL_OK if it succeeds and pushes an
- *	Tcl object holding the result. If it fails it returns TCL_ERROR
- *	and leaves an error message in the interpreter's result.
+ *	Each procedure returns TCL_OK if it succeeds and pushes an Tcl object
+ *	holding the result. If it fails it returns TCL_ERROR and leaves an
+ *	error message in the interpreter's result.
  *
  * Side effects:
  *	None.
@@ -5009,18 +5040,19 @@ ExprUnaryFunc(clientData, interp, objc, objv)
     double d, dResult;
     Tcl_Obj* oResult;
 
-    double (*func) _ANSI_ARGS_((double)) =
-	    (double (*)_ANSI_ARGS_((double))) clientData;
+    double (*func)(double) = (double (*)(double)) clientData;
 
     /*
      * Convert the function's argument to a double if necessary.
-     */ 
+     */
 
     if (objc != 2) {
 	MathFuncWrongNumArgs(interp, 2, objc, objv);
     } else if (Tcl_GetDoubleFromObj(interp, objv[1], &d) == TCL_OK) {
 
-	/* Evaluate the function */
+	/*
+	 * Evaluate the function.
+	 */
 
 	dResult = (*func)(d);
 	if ((errno != 0) || IS_NAN(dResult)) {
@@ -5040,8 +5072,8 @@ ExprUnaryFunc(clientData, interp, objc, objv)
 static int
 ExprBinaryFunc(clientData, interp, objc, objv)
     ClientData clientData;	/* Contains the address of a procedure that
-				 * takes two double arguments and
-				 * returns a double result. */
+				 * takes two double arguments and returns a
+				 * double result. */
     Tcl_Interp *interp;		/* The interpreter in which to execute the
 				 * function. */
     int objc;			/* Actual parameter count */
@@ -5050,8 +5082,7 @@ ExprBinaryFunc(clientData, interp, objc, objv)
     double d1, d2, dResult;
     Tcl_Obj* oResult;
 
-    double (*func) _ANSI_ARGS_((double, double)) =
-	    (double (*)_ANSI_ARGS_((double, double))) clientData;
+    double (*func)(double, double) = (double (*)(double, double)) clientData;
 
     /*
      * Convert the function's two arguments to doubles if necessary.
@@ -5061,8 +5092,9 @@ ExprBinaryFunc(clientData, interp, objc, objv)
 	MathFuncWrongNumArgs(interp, 3, objc, objv);
     } else if (Tcl_GetDoubleFromObj(interp, objv[1], &d1) == TCL_OK
 	    && Tcl_GetDoubleFromObj(interp, objv[2], &d2) == TCL_OK) {
-
-	/* Evaluate the function */
+	/*
+	 * Evaluate the function.
+	 */
 
 	errno = 0;
 	dResult = (*func)(d1, d2);
@@ -5107,6 +5139,7 @@ ExprAbsFunc(clientData, interp, objc, objv)
     /*
      * Derive the absolute value according to the arg type.
      */
+
     if (valuePtr->typePtr == &tclIntType) {
 	i = valuePtr->internalRep.longValue;
 	if (i < 0) {
@@ -5118,7 +5151,7 @@ ExprAbsFunc(clientData, interp, objc, objv)
 		Tcl_SetErrorCode(interp, "ARITH", "IOVERFLOW",
 			"integer value too large to represent", (char *) NULL);
 		return TCL_ERROR;
-#else 
+#else
 		/*
 		 * Special case: abs(MIN_INT) must promote to wide.
 		 */
@@ -5129,12 +5162,13 @@ ExprAbsFunc(clientData, interp, objc, objv)
 	    }
 	} else {
 	    iResult = i;
-	}	    
+	}
 	TclNewLongObj(oResult, iResult);
 	Tcl_SetObjResult(interp, oResult);
     } else if (valuePtr->typePtr == &tclWideIntType) {
 	Tcl_WideInt wResult, w;
-	TclGetWide(w,valuePtr);
+
+	TclGetWide(w, valuePtr);
 	if (w < (Tcl_WideInt)0) {
 	    wResult = -w;
 	    if (wResult < 0) {
@@ -5146,7 +5180,7 @@ ExprAbsFunc(clientData, interp, objc, objv)
 	    }
 	} else {
 	    wResult = w;
-	}	    
+	}
 	TclNewWideIntObj(oResult, wResult);
 	Tcl_SetObjResult(interp, oResult);
     } else {
@@ -5344,7 +5378,7 @@ ExprRandFunc(clientData, interp, objc, objv)
     if (!(iPtr->flags & RAND_SEED_INITIALIZED)) {
 	iPtr->flags |= RAND_SEED_INITIALIZED;
 
-	/* 
+	/*
 	 * Take into consideration the thread this interp is running in order
 	 * to insure different seeds in different threads (bug #416643)
 	 */
@@ -5352,7 +5386,7 @@ ExprRandFunc(clientData, interp, objc, objv)
 	iPtr->randSeed = TclpGetClicks() + ((long)Tcl_GetCurrentThread()<<12);
 
 	/*
-	 * Make sure 1 <= randSeed <= (2^31) - 2.  See below.
+	 * Make sure 1 <= randSeed <= (2^31) - 2. See below.
 	 */
 
 	iPtr->randSeed &= (unsigned long) 0x7fffffff;
@@ -5362,30 +5396,29 @@ ExprRandFunc(clientData, interp, objc, objv)
     }
 
     /*
-     * Generate the random number using the linear congruential
-     * generator defined by the following recurrence:
+     * Generate the random number using the linear congruential generator
+     * defined by the following recurrence:
      *		seed = ( IA * seed ) mod IM
-     * where IA is 16807 and IM is (2^31) - 1.  The recurrence maps
-     * a seed in the range [1, IM - 1] to a new seed in that same range.
-     * The recurrence maps IM to 0, and maps 0 back to 0, so those two
-     * values must not be allowed as initial values of seed.
+     * where IA is 16807 and IM is (2^31) - 1. The recurrence maps a seed in
+     * the range [1, IM - 1] to a new seed in that same range. The recurrence
+     * maps IM to 0, and maps 0 back to 0, so those two values must not be
+     * allowed as initial values of seed.
      *
      * In order to avoid potential problems with integer overflow, the
-     * recurrence is implemented in terms of additional constants
-     * IQ and IR such that
+     * recurrence is implemented in terms of additional constants IQ and IR
+     * such that
      *		IM = IA*IQ + IR
-     * None of the operations in the implementation overflows a 32-bit
-     * signed integer, and the C type long is guaranteed to be at least
-     * 32 bits wide.
+     * None of the operations in the implementation overflows a 32-bit signed
+     * integer, and the C type long is guaranteed to be at least 32 bits wide.
      *
      * For more details on how this algorithm works, refer to the following
-     * papers: 
+     * papers:
      *
-     *	S.K. Park & K.W. Miller, "Random number generators: good ones
-     *	are hard to find," Comm ACM 31(10):1192-1201, Oct 1988
+     *	S.K. Park & K.W. Miller, "Random number generators: good ones are hard
+     *	to find," Comm ACM 31(10):1192-1201, Oct 1988
      *
-     *	W.H. Press & S.A. Teukolsky, "Portable random number
-     *	generators," Computers in Physics 6(5):522-524, Sep/Oct 1992.
+     *	W.H. Press & S.A. Teukolsky, "Portable random number generators,"
+     *	Computers in Physics 6(5):522-524, Sep/Oct 1992.
      */
 
 #define RAND_IA		16807
@@ -5427,7 +5460,9 @@ ExprRoundFunc(clientData, interp, objc, objv)
     Tcl_Obj *valuePtr, *resPtr;
     double d, i, f;
 
-    /* Check the argument count. */
+    /*
+     * Check the argument count.
+     */
 
     if (objc != 2) {
 	MathFuncWrongNumArgs(interp, 1, objc, objv);
@@ -5435,7 +5470,9 @@ ExprRoundFunc(clientData, interp, objc, objv)
     }
     valuePtr = objv[1];
 
-    /* Coerce the argument to a number. Integers are already rounded. */
+    /*
+     * Coerce the argument to a number. Integers are already rounded.
+     */
 
     if (VerifyExprObjType(interp, valuePtr) != TCL_OK) {
 	return TCL_ERROR;
@@ -5447,9 +5484,9 @@ ExprRoundFunc(clientData, interp, objc, objv)
     }
     GET_DOUBLE_VALUE(d, valuePtr, valuePtr->typePtr);
 
-    /* 
-     * Round the number to the nearest integer.  I'd like to use round(),
-     * but it's C99 (or BSD), and not yet universal.
+    /*
+     * Round the number to the nearest integer. I'd like to use round(), but
+     * it's C99 (or BSD), and not yet universal.
      */
 
     d = valuePtr->internalRep.doubleValue;
@@ -5464,7 +5501,7 @@ ExprRoundFunc(clientData, interp, objc, objv)
 	    resPtr = Tcl_NewWideIntObj(Tcl_DoubleAsWide(i));
 	} else {
 	    resPtr = Tcl_NewLongObj((long) i);
-	}			    
+	}
     } else {
 	if (f >= 0.5) {
 	    i += 1.0;
@@ -5530,8 +5567,8 @@ ExprSrandFunc(clientData, interp, objc, objv)
     }
 
     /*
-     * Reset the seed.  Make sure 1 <= randSeed <= 2^31 - 2.
-     * See comments in ExprRandFunc() for more details.
+     * Reset the seed. Make sure 1 <= randSeed <= 2^31 - 2. See comments in
+     * ExprRandFunc() for more details.
      */
 
     iPtr->flags |= RAND_SEED_INITIALIZED;
@@ -5542,9 +5579,9 @@ ExprSrandFunc(clientData, interp, objc, objv)
     }
 
     /*
-     * To avoid duplicating the random number generation code we simply
-     * clean up our state and call the real random number function. That
-     * function will always succeed.
+     * To avoid duplicating the random number generation code we simply clean
+     * up our state and call the real random number function. That function
+     * will always succeed.
      */
 
     return ExprRandFunc(clientData, interp, 1, objv);
@@ -5556,10 +5593,10 @@ ExprSrandFunc(clientData, interp, objc, objv)
  *
  * VerifyExprObjType --
  *
- *	This procedure is called by the math functions to verify that
- *	the object is either an int or double, coercing it if necessary.
- *	If an error occurs during conversion, an error message is left
- *	in the interpreter's result unless "interp" is NULL.
+ *	This procedure is called by the math functions to verify that the
+ *	object is either an int or double, coercing it if necessary. If an
+ *	error occurs during conversion, an error message is left in the
+ *	interpreter's result unless "interp" is NULL.
  *
  * Results:
  *	TCL_OK if it was int or double, TCL_ERROR otherwise
@@ -5611,14 +5648,14 @@ VerifyExprObjType(interp, objPtr)
  *
  * MathFuncWrongNumArgs --
  *
- *	Generate an error message when a math function presents the
- *	wrong number of arguments
+ *	Generate an error message when a math function presents the wrong
+ *	number of arguments.
  *
  * Results:
  *	None.
  *
  * Side effects:
- *	An error message is stored in the interpreter result
+ *	An error message is stored in the interpreter result.
  *
  *----------------------------------------------------------------------
  */
@@ -5633,6 +5670,7 @@ MathFuncWrongNumArgs(interp, expected, found, objv)
     Tcl_Obj* errorMessage;
     CONST char* name = Tcl_GetString(objv[0]);
     CONST char* tail = name + strlen(name);
+
     while (tail > name+1) {
 	--tail;
 	if (*tail == ':' && tail[-1] == ':') {
@@ -5651,3 +5689,11 @@ MathFuncWrongNumArgs(interp, expected, found, objv)
     Tcl_AppendToObj(errorMessage, "\"", -1);
     Tcl_SetObjResult(interp, errorMessage);
 }
+
+/*
+ * Local Variables:
+ * mode: c
+ * c-basic-offset: 4
+ * fill-column: 78
+ * End:
+ */
diff --git a/generic/tclInt.h b/generic/tclInt.h
index 04a8096..4ec4f71 100644
--- a/generic/tclInt.h
+++ b/generic/tclInt.h
@@ -12,7 +12,7 @@
  * See the file "license.terms" for information on usage and redistribution of
  * this file, and for a DISCLAIMER OF ALL WARRANTIES.
  *
- * RCS: @(#) $Id: tclInt.h,v 1.247 2005/08/26 14:43:28 dkf Exp $
+ * RCS: @(#) $Id: tclInt.h,v 1.248 2005/09/06 14:40:11 dkf Exp $
  */
 
 #ifndef _TCLINT
@@ -1712,6 +1712,10 @@ typedef struct List {
     int refCount;
     int maxElemCount;		/* Total number of element array slots. */
     int elemCount;		/* Current number of list elements. */
+    int canonicalFlag;		/* Set if the string representation was
+				 * derived from the list representation. May
+				 * be ignored if there is no string rep at
+				 * all.*/
     Tcl_Obj *elements;		/* First list element; the struct is grown to
 				 * accomodate all elements. */
 } List;
diff --git a/generic/tclListObj.c b/generic/tclListObj.c
index 1488ecb..e83a8f4 100644
--- a/generic/tclListObj.c
+++ b/generic/tclListObj.c
@@ -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.
  *
- * RCS: @(#) $Id: tclListObj.c,v 1.26 2005/09/02 19:23:46 andreas_kupries Exp $
+ * RCS: @(#) $Id: tclListObj.c,v 1.27 2005/09/06 14:40:11 dkf Exp $
  */
 
 #include "tclInt.h"
@@ -19,14 +19,11 @@
  * Prototypes for functions defined later in this file:
  */
 
-static List*		NewListIntRep _ANSI_ARGS_((int objc,
-			    Tcl_Obj *CONST objv[]));
-static void		DupListInternalRep _ANSI_ARGS_((Tcl_Obj *srcPtr,
-			    Tcl_Obj *copyPtr));
-static void		FreeListInternalRep _ANSI_ARGS_((Tcl_Obj *listPtr));
-static int		SetListFromAny _ANSI_ARGS_((Tcl_Interp *interp,
-			    Tcl_Obj *objPtr));
-static void		UpdateStringOfList _ANSI_ARGS_((Tcl_Obj *listPtr));
+static List *		NewListIntRep(int objc, Tcl_Obj *CONST objv[]);
+static void		DupListInternalRep(Tcl_Obj *srcPtr, Tcl_Obj *copyPtr);
+static void		FreeListInternalRep(Tcl_Obj *listPtr);
+static int		SetListFromAny(Tcl_Interp *interp, Tcl_Obj *objPtr);
+static void		UpdateStringOfList(Tcl_Obj *listPtr);
 
 /*
  * The structure below defines the list Tcl object type by means of functions
@@ -42,11 +39,11 @@ static void		UpdateStringOfList _ANSI_ARGS_((Tcl_Obj *listPtr));
  */
 
 Tcl_ObjType tclListType = {
-    "list",				/* name */
-    FreeListInternalRep,		/* freeIntRepProc */
-    DupListInternalRep,			/* dupIntRepProc */
-    UpdateStringOfList,			/* updateStringProc */
-    NULL				/* setFromAnyProc */
+    "list",			/* name */
+    FreeListInternalRep,	/* freeIntRepProc */
+    DupListInternalRep,		/* dupIntRepProc */
+    UpdateStringOfList,		/* updateStringProc */
+    NULL			/* setFromAnyProc */
 };
 
 
@@ -89,7 +86,7 @@ NewListIntRep(objc, objv)
 
     /*
      * First check to see if we'd overflow and try to allocate an object
-     * larger than our memory allocator allows.  Note that this is actually a
+     * larger than our memory allocator allows. Note that this is actually a
      * fairly small value when you're on a serious 64-bit machine, but that
      * requires API changes to fix.
      */
@@ -104,6 +101,7 @@ NewListIntRep(objc, objv)
 	return NULL;
     }
 
+    listRepPtr->canonicalFlag = 0;
     listRepPtr->refCount = 0;
     listRepPtr->maxElemCount = objc;
 
@@ -771,7 +769,7 @@ Tcl_ListObjReplace(interp, listPtr, first, count, objc, objv)
     elemPtrs = &listRepPtr->elements;
     numElems = listRepPtr->elemCount;
 
-    if (first < 0)  {
+    if (first < 0) {
     	first = 0;
     }
     if (first >= numElems) {
@@ -954,8 +952,8 @@ Tcl_ListObjReplace(interp, listPtr, first, count, objc, objv)
  *
  *	Tcl_LsetFlat and related functions maintain a linked list of Tcl_Obj's
  *	whose string representations must be spoilt by threading via 'ptr2' of
- *	the two-pointer internal representation.  On entry to Tcl_LsetList,
- *	the values of 'ptr2' are immaterial; on exit, the 'ptr2' field of any
+ *	the two-pointer internal representation. On entry to Tcl_LsetList, the
+ *	values of 'ptr2' are immaterial; on exit, the 'ptr2' field of any
  *	Tcl_Obj that has been modified is set to NULL.
  *
  *----------------------------------------------------------------------
@@ -993,7 +991,7 @@ TclLsetList(interp, listPtr, indexArgPtr, valuePtr)
 	    &indices) != TCL_OK) {
 	/*
 	 * indexArgPtr designates something that is neither an index nor a
-	 * well formed list.  Report the error via TclLsetFlat.
+	 * well formed list. Report the error via TclLsetFlat.
 	 */
 
 	return TclLsetFlat(interp, listPtr, 1, &indexArgPtr, valuePtr);
@@ -1041,7 +1039,7 @@ TclLsetList(interp, listPtr, indexArgPtr, valuePtr)
  *
  * TclLsetFlat --
  *
- *	Core of the 'lset' command when objc>=5.  Objv[2], ... , objv[objc-2]
+ *	Core of the 'lset' command when objc>=5. Objv[2], ... , objv[objc-2]
  *	contain scalar indices.
  *
  * Results:
@@ -1064,18 +1062,18 @@ TclLsetList(interp, listPtr, indexArgPtr, valuePtr)
  *
  *	If no error occurs, the reference count of the original object is
  *	incremented if the object has not been duplicated, and nothing is done
- *	to a reference count of the duplicate.  Now the reference count of an
+ *	to a reference count of the duplicate. Now the reference count of an
  *	unduplicated object is 2 (the returned pointer, plus the one stored in
- *	the variable).  The reference count of a duplicate object is 1,
+ *	the variable). The reference count of a duplicate object is 1,
  *	reflecting that the returned pointer is the only active reference.
  *	The caller is expected to store the returned value back in the
- *	variable and decrement its reference count.  (INST_STORE_* does
- *	exactly this.)
+ *	variable and decrement its reference count. (INST_STORE_* does exactly
+ *	this.)
  *
  *	Tcl_LsetList and related functions maintain a linked list of Tcl_Obj's
  *	whose string representations must be spoilt by threading via 'ptr2' of
- *	the two-pointer internal representation.  On entry to Tcl_LsetList,
- *	the values of 'ptr2' are immaterial; on exit, the 'ptr2' field of any
+ *	the two-pointer internal representation. On entry to Tcl_LsetList, the
+ *	values of 'ptr2' are immaterial; on exit, the 'ptr2' field of any
  *	Tcl_Obj that has been modified is set to NULL.
  *
  *----------------------------------------------------------------------
@@ -1292,7 +1290,9 @@ TclListObjSetElement(interp, listPtr, index, valuePtr)
     int elemCount;		/* Number of elements in the list */
     int i;
 
-    /* Ensure that the listPtr parameter designates an unshared list */
+    /*
+     * Ensure that the listPtr parameter designates an unshared list.
+     */
 
     if (Tcl_IsShared(listPtr)) {
 	Tcl_Panic("Tcl_ListObjSetElement called with shared object");
@@ -1316,7 +1316,9 @@ TclListObjSetElement(interp, listPtr, index, valuePtr)
     elemCount = listRepPtr->elemCount;
     elemPtrs = &listRepPtr->elements;
 
-    /* Ensure that the index is in bounds. */
+    /*
+     * Ensure that the index is in bounds.
+     */
 
     if (index<0 || index>=elemCount) {
 	if (interp != NULL) {
@@ -1335,6 +1337,7 @@ TclListObjSetElement(interp, listPtr, index, valuePtr)
 	Tcl_Obj **oldElemPtrs = elemPtrs;
 
 	listRepPtr = NewListIntRep(listRepPtr->maxElemCount, NULL);
+	listRepPtr->canonicalFlag = oldListRepPtr->canonicalFlag;
 	elemPtrs = &listRepPtr->elements;
 	for (i=0; i < elemCount; i++) {
 	    elemPtrs[i] = oldElemPtrs[i];
@@ -1346,15 +1349,21 @@ TclListObjSetElement(interp, listPtr, index, valuePtr)
 	oldListRepPtr->refCount--;
     }
 
-    /* Add a reference to the new list element */
+    /*
+     * Add a reference to the new list element.
+     */
 
     Tcl_IncrRefCount(valuePtr);
 
-    /* Remove a reference from the old list element */
+    /*
+     * Remove a reference from the old list element.
+     */
 
     Tcl_DecrRefCount(elemPtrs[index]);
 
-    /* Stash the new object in the list */
+    /*
+     * Stash the new object in the list.
+     */
 
     elemPtrs[index] = valuePtr;
 
@@ -1473,11 +1482,10 @@ SetListFromAny(interp, objPtr)
 
     /*
      * Parse the string into separate string objects, and create a List
-     * structure that points to the element string objects. We use a
-     * modified version of Tcl_SplitList's implementation to avoid one
-     * malloc and a string copy for each list element. First, estimate the
-     * number of elements by counting the number of space characters in the
-     * list.
+     * structure that points to the element string objects. We use a modified
+     * version of Tcl_SplitList's implementation to avoid one malloc and a
+     * string copy for each list element. First, estimate the number of
+     * elements by counting the number of space characters in the list.
      */
 
     limit = (string + length);
@@ -1489,14 +1497,14 @@ SetListFromAny(interp, objPtr)
     }
 
     /*
-     * Allocate a new List structure with enough room for "estCount"
-     * elements. Each element is a pointer to a Tcl_Obj with the appropriate
-     * string rep. The initial "estCount" elements are set using the
-     * corresponding "argv" strings.
+     * Allocate a new List structure with enough room for "estCount" elements.
+     * Each element is a pointer to a Tcl_Obj with the appropriate string rep.
+     * The initial "estCount" elements are set using the corresponding "argv"
+     * strings.
      */
 
     listRepPtr = NewListIntRep(estCount, NULL);
-    if(!listRepPtr) {
+    if (!listRepPtr) {
 	Tcl_SetObjResult(interp, Tcl_NewStringObj(
 		"Not enough memory to allocate the list internal rep", -1));
 	return TCL_ERROR;
@@ -1530,20 +1538,20 @@ SetListFromAny(interp, objPtr)
 
 	s = ckalloc((unsigned) elemSize + 1);
 	if (hasBrace) {
-	    memcpy((VOID *) s, (VOID *) elemStart,  (size_t) elemSize);
+	    memcpy((VOID *) s, (VOID *) elemStart, (size_t) elemSize);
 	    s[elemSize] = 0;
 	} else {
 	    elemSize = TclCopyAndCollapse(elemSize, elemStart, s);
 	}
 
 	TclNewObj(elemPtr);
-	elemPtr->bytes  = s;
+	elemPtr->bytes = s;
 	elemPtr->length = elemSize;
 	elemPtrs[i] = elemPtr;
-	Tcl_IncrRefCount(elemPtr); /* since list now holds ref to it */
+	Tcl_IncrRefCount(elemPtr);	/* since list now holds ref to it */
     }
 
-    listRepPtr->elemCount    = i;
+    listRepPtr->elemCount = i;
 
     /*
      * Free the old internalRep before setting the new one. We do this as late
@@ -1613,9 +1621,11 @@ UpdateStringOfList(listPtr)
 	elem = Tcl_GetStringFromObj(elemPtrs[i], &length);
 	listPtr->length += Tcl_ScanCountedElement(elem, length,
 		&flagPtr[i]) + 1;
+
 	/*
 	 * Check for continued sanity. [Bug 1267380]
 	 */
+
 	if (listPtr->length < 1) {
 	    Tcl_Panic("string representation size exceeds sane bounds");
 	}
@@ -1644,6 +1654,14 @@ UpdateStringOfList(listPtr)
 	*dst = 0;
     }
     listPtr->length = dst - listPtr->bytes;
+
+    /*
+     * Mark the list as being canonical; although it has a string rep, it is
+     * one we derived through proper "canonical" quoting and so it's known to
+     * be free from nasties relating to [concat] and [eval].
+     */
+
+    listRepPtr->canonicalFlag = 1;
 }
 
 /*
diff --git a/generic/tclUtil.c b/generic/tclUtil.c
index 30cf775..0654f65 100644
--- a/generic/tclUtil.c
+++ b/generic/tclUtil.c
@@ -11,7 +11,7 @@
  * See the file "license.terms" for information on usage and redistribution of
  * this file, and for a DISCLAIMER OF ALL WARRANTIES.
  *
- *  RCS: @(#) $Id: tclUtil.c,v 1.63 2005/07/27 18:24:02 dgp Exp $
+ *  RCS: @(#) $Id: tclUtil.c,v 1.64 2005/09/06 14:40:11 dkf Exp $
  */
 
 #include "tclInt.h"
@@ -1057,8 +1057,14 @@ Tcl_ConcatObj(objc, objv)
      */
 
     for (i = 0;  i < objc;  i++) {
+	List *listRepPtr;
+
 	objPtr = objv[i];
-	if ((objPtr->typePtr != &tclListType) || (objPtr->bytes != NULL)) {
+	if (objPtr->typePtr != &tclListType) {
+	    break;
+	}
+	listRepPtr = (List *) objPtr->internalRep.twoPtrValue.ptr1;
+	if (objPtr->bytes != NULL && !listRepPtr->canonicalFlag) {
 	    break;
 	}
     }
@@ -1074,6 +1080,7 @@ Tcl_ConcatObj(objc, objv)
 	     * INT_MAX tells us to always put the new stuff on the end. It
 	     * will be set right in Tcl_ListObjReplace.
 	     */
+
 	    Tcl_ListObjGetElements(NULL, objv[i], &listc, &listv);
 	    Tcl_ListObjReplace(NULL, objPtr, INT_MAX, 0, listc, listv);
 	}