From e76d16d3eba7f034fc003f1061736c298b03c74f Mon Sep 17 00:00:00 2001
From: "jan.nijtmans" <nijtmans@users.sourceforge.net>
Date: Fri, 7 Dec 2012 21:28:49 +0000
Subject: only set tclStubsPtr if all version checks pass. Backported from tcl
 8.5.

---
 generic/tclStubLib.c | 105 ++++++++++++++++++++++++++++++---------------------
 1 file changed, 62 insertions(+), 43 deletions(-)

diff --git a/generic/tclStubLib.c b/generic/tclStubLib.c
index 7bf04a0..39e94c8 100644
--- a/generic/tclStubLib.c
+++ b/generic/tclStubLib.c
@@ -1,45 +1,26 @@
-/* 
+/*
  * tclStubLib.c --
  *
- *	Stub object that will be statically linked into extensions that wish
+ *	Stub object that will be statically linked into extensions that want
  *	to access Tcl.
  *
  * Copyright (c) 1998-1999 by Scriptics Corporation.
  * Copyright (c) 1998 Paul Duffin.
  *
- * See the file "license.terms" for information on usage and redistribution
- * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
- */
-
-/*
- * We need to ensure that we use the stub macros so that this file contains
- * no references to any of the stub functions.  This will make it possible
- * to build an extension that references Tcl_InitStubs but doesn't end up
- * including the rest of the stub functions.
+ * See the file "license.terms" for information on usage and redistribution of
+ * this file, and for a DISCLAIMER OF ALL WARRANTIES.
  */
 
-#ifndef USE_TCL_STUBS
-#define USE_TCL_STUBS
-#endif
-#undef USE_TCL_STUB_PROCS
-
 #include "tclInt.h"
 #include "tclPort.h"
 
-/*
- * Ensure that Tcl_InitStubs is built as an exported symbol.  The other stub
- * functions should be built as non-exported symbols.
- */
-
 TclStubs *tclStubsPtr = NULL;
 TclPlatStubs *tclPlatStubsPtr = NULL;
 TclIntStubs *tclIntStubsPtr = NULL;
 TclIntPlatStubs *tclIntPlatStubsPtr = NULL;
 
-static TclStubs *	HasStubSupport _ANSI_ARGS_((Tcl_Interp *interp));
-
 static TclStubs *
-HasStubSupport (interp)
+HasStubSupport(interp)
     Tcl_Interp *interp;
 {
     Interp *iPtr = (Interp *) interp;
@@ -49,57 +30,87 @@ HasStubSupport (interp)
     }
     interp->result = "interpreter uses an incompatible stubs mechanism";
     interp->freeProc = TCL_STATIC;
-
     return NULL;
 }
 
 /*
+ * Use our own isdigit to avoid linking to libc on windows
+ */
+
+static int isDigit(const int c)
+{
+    return (c >= '0' && c <= '9');
+}
+
+/*
  *----------------------------------------------------------------------
  *
  * Tcl_InitStubs --
  *
- *	Tries to initialise the stub table pointers and ensures that
- *	the correct version of Tcl is loaded.
+ *	Tries to initialise the stub table pointers and ensures that the
+ *	correct version of Tcl is loaded.
  *
  * Results:
- *	The actual version of Tcl that satisfies the request, or
- *	NULL to indicate that an error occurred.
+ *	The actual version of Tcl that satisfies the request, or NULL to
+ *	indicate that an error occurred.
  *
  * Side effects:
  *	Sets the stub table pointers.
  *
  *----------------------------------------------------------------------
  */
-
-#ifdef Tcl_InitStubs
 #undef Tcl_InitStubs
-#endif
-
 CONST char *
-Tcl_InitStubs (interp, version, exact)
+Tcl_InitStubs(interp, version, exact)
     Tcl_Interp *interp;
     CONST char *version;
     int exact;
 {
     CONST char *actualVersion = NULL;
-    ClientData pkgData = NULL;
+    TclStubs *stubsPtr;
 
     /*
-     * We can't optimize this check by caching tclStubsPtr because
-     * that prevents apps from being able to load/unload Tcl dynamically
-     * multiple times. [Bug 615304]
+     * We can't optimize this check by caching tclStubsPtr because that
+     * prevents apps from being able to load/unload Tcl dynamically multiple
+     * times. [Bug 615304]
      */
 
-    tclStubsPtr = HasStubSupport(interp);
-    if (!tclStubsPtr) {
+    stubsPtr = HasStubSupport(interp);
+    if (!stubsPtr) {
 	return NULL;
     }
 
-    actualVersion = Tcl_PkgRequireEx(interp, "Tcl", version, exact, &pkgData);
+    actualVersion = stubsPtr->tcl_PkgRequireEx(interp, "Tcl", version, 0, NULL);
     if (actualVersion == NULL) {
 	return NULL;
     }
-    tclStubsPtr = (TclStubs*)pkgData;
+    if (exact) {
+	CONST char *p = version;
+	int count = 0;
+
+	while (*p) {
+	    count += !isDigit(*p++);
+	}
+	if (count == 1) {
+	    CONST char *q = actualVersion;
+
+	    p = version;
+	    while (*p && (*p == *q)) {
+		p++; q++;
+	    }
+	    if (*p || isDigit(*q)) {
+		/* Construct error message */
+		stubsPtr->tcl_PkgRequireEx(interp, "Tcl", version, 1, NULL);
+		return NULL;
+	    }
+	} else {
+	    actualVersion = stubsPtr->tcl_PkgRequireEx(interp, "Tcl", version, 1, NULL);
+	    if (actualVersion == NULL) {
+		return NULL;
+	    }
+	}
+    }
+    tclStubsPtr = stubsPtr;
 
     if (tclStubsPtr->hooks) {
 	tclPlatStubsPtr = tclStubsPtr->hooks->tclPlatStubs;
@@ -110,6 +121,14 @@ Tcl_InitStubs (interp, version, exact)
 	tclIntStubsPtr = NULL;
 	tclIntPlatStubsPtr = NULL;
     }
-    
+
     return actualVersion;
 }
+
+/*
+ * Local Variables:
+ * mode: c
+ * c-basic-offset: 4
+ * fill-column: 78
+ * End:
+ */
-- 
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