fixed Bug 1185933

FossilOrigin-Name: 089af482d8e0b1512c6fd1b5ddd804630054ce69

3 files changed, 63 insertions, 23 deletions

diff --git a/ChangeLog b/ChangeLog
index 8d69ff5..adcd6e7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+2005-04-19  Kevin B. Kenny  <kennykb@acm.org>
+
+	* library/clock.tcl (Initialize): Put initialization code into a
+	proc to avoid inadvertently clobbering global variables.
+	[Bug 1185933]
+	* tests/clock.test (clock-48.1): Added regression test for the
+	above bug.
+	Thanks to Ulrich Ring for reporting this bug.
+	
 2005-04-16  Miguel Sofer <msofer@users.sf.net>
 
 	* generic/Var.c (Tcl_ArrayObjCmd - ARRAY_NAMES): fix Tcl_Obj leak
diff --git a/library/clock.tcl b/library/clock.tcl
index 337ed5a..ec97d2d 100644
--- a/library/clock.tcl
+++ b/library/clock.tcl
@@ -13,7 +13,7 @@
 # See the file "license.terms" for information on usage and redistribution
 # of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 #
-# RCS: @(#) $Id: clock.tcl,v 1.14 2005/04/13 19:28:51 kennykb Exp $
+# RCS: @(#) $Id: clock.tcl,v 1.15 2005/04/19 15:11:07 kennykb Exp $
 #
 #----------------------------------------------------------------------
 
@@ -82,9 +82,37 @@ namespace eval ::tcl::clock {
     namespace import ::msgcat::mcload
     namespace import ::msgcat::mclocale
 
+}
+
+#----------------------------------------------------------------------
+#
+# ::tcl::clock::Initialize --
+#
+#	Finish initializing the 'clock' subsystem
+#
+# Results:
+#	None.
+#
+# Side effects:
+#	Namespace variable in the 'clock' subsystem are initialized.
+#
+# The '::tcl::clock::Initialize' procedure initializes the namespace
+# variables and root locale message catalog for the 'clock' subsystem.
+# It is broken into a procedure rather than simply evaluated as a script
+# so that it will be able to use local variables, avoiding the dangers
+# of 'creative writing' as in Bug 1185933.
+#
+#----------------------------------------------------------------------
+
+proc ::tcl::clock::Initialize {} {
+
+    rename ::tcl::clock::Initialize {}
+
+    variable LibDir
+
     # Define the Greenwich time zone
 
-    proc initTZData {} {
+    proc InitTZData {} {
 	variable TZData
 	array unset TZData
 	set TZData(:Etc/GMT) {
@@ -96,7 +124,7 @@ namespace eval ::tcl::clock {
 	}
 	set TZData(:UTC) $TZData(:Etc/UTC)
     }
-    initTZData
+    InitTZData
 
     # Define the message catalog for the root locale.
 
@@ -227,21 +255,16 @@ namespace eval ::tcl::clock {
     # are known to reside on various operating systems
 
     variable ZoneinfoPaths {}
-    proc ZoneinfoInit {} {
-	variable ZoneinfoPaths
-	rename ZoneinfoInit {}
-	foreach path {
-	    /usr/share/zoneinfo
-	    /usr/share/lib/zoneinfo
-	    /usr/local/etc/zoneinfo
-	    C:/Progra~1/cygwin/usr/local/etc/zoneinfo
-	} {
-	    if { [file isdirectory $path] } {
-		lappend ZoneinfoPaths $path
-	    }
+    foreach path {
+	/usr/share/zoneinfo
+	/usr/share/lib/zoneinfo
+	/usr/local/etc/zoneinfo
+	C:/Progra~1/cygwin/usr/local/etc/zoneinfo
+    } {
+	if { [file isdirectory $path] } {
+	    lappend ZoneinfoPaths $path
 	}
     }
-    ZoneinfoInit
 
     # Define the directories for time zone data and message catalogs.
 
@@ -264,7 +287,6 @@ namespace eval ::tcl::clock {
     foreach j $DaysInRomanMonthInLeapYear {
 	lappend DaysInPriorMonthsInLeapYear [incr i $j]
     }
-    unset i j
 
     # Another epoch (Hi, Jeff!)
 
@@ -598,6 +620,7 @@ namespace eval ::tcl::clock {
 					# Daylight Saving Time indicator, and
 					# time zone abbreviation.
 }
+::tcl::clock::Initialize
 
 #----------------------------------------------------------------------
 #
@@ -1304,10 +1327,6 @@ proc ::tcl::clock::FreeScan { string base timezone locale } {
     
     if { [llength $parseWeekday] > 0 } {
 
-	# TODO - There's no reason for this to involve the
-	#        ISO calendar; day of week is determined by
-	#        Julian Day and there's no need to extract
-	#        week of year
 	foreach {dayOrdinal dayOfWeek} $parseWeekday break
 	set date2 [GetJulianDay \
 		       [ConvertUTCToLocal \
@@ -5042,6 +5061,6 @@ proc ::tcl::clock::ClearCaches {} {
     set LocaleNumeralCache {}
     set McLoaded {}
     catch {unset CachedSystemTimeZone}
-    initTZData
+    InitTZData
 
 }
diff --git a/tests/clock.test b/tests/clock.test
index 7cd4509..7c2673d 100644
--- a/tests/clock.test
+++ b/tests/clock.test
@@ -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: clock.test,v 1.53 2004/12/29 20:57:28 kennykb Exp $
+# RCS: @(#) $Id: clock.test,v 1.54 2005/04/19 15:11:08 kennykb Exp $
 
 if {[lsearch [namespace children] ::tcltest] == -1} {
     package require tcltest 2
@@ -35399,6 +35399,18 @@ test clock-47.2 {regression test - four digit time} {
     clock scan 0039
 } [clock scan 0039 -format %H%M]
 
+test clock-48.1 {Bug 1185933: 'i' destroyed by clock init} -setup {
+    interp create child
+} -body {
+    interp eval child {
+	set i 12345
+	clock format 0
+	list [catch { set i } result] $result
+    }
+} -cleanup {
+    interp delete child
+} -result {0 12345}
+
 # cleanup
 
 namespace delete ::testClock