From 5c538fa1b96b4a1f0bf417d13cd4ce7f359db158 Mon Sep 17 00:00:00 2001
From: dgp <dgp@users.sourceforge.net>
Date: Wed, 17 Dec 2014 19:57:40 +0000
Subject: Revise encoding finalization so that it does a more complete job of
 restoring the pre-initialized state.  This makes finalization errors more
 repeatable and cross-platform.

---
 generic/tclEncoding.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/generic/tclEncoding.c b/generic/tclEncoding.c
index d246cb2..95c59c0 100644
--- a/generic/tclEncoding.c
+++ b/generic/tclEncoding.c
@@ -180,9 +180,9 @@ TCL_DECLARE_MUTEX(encodingMutex)
  * the system encoding will be used to perform the conversion.
  */
 
-static Tcl_Encoding defaultEncoding;
-static Tcl_Encoding systemEncoding;
-Tcl_Encoding tclIdentityEncoding;
+static Tcl_Encoding defaultEncoding = NULL;
+static Tcl_Encoding systemEncoding = NULL;
+Tcl_Encoding tclIdentityEncoding = NULL;
 
 /*
  * The following variable is used in the sparse matrix code for a
@@ -652,7 +652,10 @@ TclFinalizeEncodingSubsystem(void)
     Tcl_MutexLock(&encodingMutex);
     encodingsInitialized = 0;
     FreeEncoding(systemEncoding);
+    systemEncoding = NULL;
+    defaultEncoding = NULL;
     FreeEncoding(tclIdentityEncoding);
+    tclIdentityEncoding = NULL;
 
     hPtr = Tcl_FirstHashEntry(&encodingTable, &search);
     while (hPtr != NULL) {
@@ -2960,7 +2963,9 @@ TableFreeProc(
      */
 
     ckfree(dataPtr->toUnicode);
+    dataPtr->toUnicode = NULL;
     ckfree(dataPtr->fromUnicode);
+    dataPtr->fromUnicode = NULL;
     ckfree(dataPtr);
 }
 
@@ -3433,6 +3438,7 @@ EscapeFreeProc(
 	subTablePtr = dataPtr->subTables;
 	for (i = 0; i < dataPtr->numSubTables; i++) {
 	    FreeEncoding((Tcl_Encoding) subTablePtr->encodingPtr);
+	    subTablePtr->encodingPtr = NULL;
 	    subTablePtr++;
 	}
     }
-- 
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