From a7534bc7ed966b9b399e86be1c6cc2004baf379c Mon Sep 17 00:00:00 2001
From: "jan.nijtmans" <nijtmans@users.sourceforge.net>
Date: Mon, 27 Jun 2016 10:22:30 +0000
Subject: Make TCL_MAJOR_VERSION/TCL_MINOR_VERSION/TCL_STUB_MAGIC available to
 Tcl_InitStubs() arguments. Useful for debugging and detection of stub
 incompatibilities (e.g. for Tcl9)

---
 generic/tcl.h        | 19 +++++++++----------
 generic/tclPkg.c     |  2 +-
 generic/tclStubLib.c | 20 +++++++++-----------
 3 files changed, 19 insertions(+), 22 deletions(-)

diff --git a/generic/tcl.h b/generic/tcl.h
index be40368..6061ea8 100644
--- a/generic/tcl.h
+++ b/generic/tcl.h
@@ -2377,9 +2377,6 @@ typedef int (Tcl_NRPostProc) (ClientData data[], Tcl_Interp *interp,
  *----------------------------------------------------------------------------
  * The following constant is used to test for older versions of Tcl in the
  * stubs tables.
- *
- * Jan Nijtman's plus patch uses 0xFCA1BACF, so we need to pick a different
- * value since the stubs tables don't match.
  */
 
 #define TCL_STUB_MAGIC		((int) 0xFCA3BACF)
@@ -2392,17 +2389,19 @@ typedef int (Tcl_NRPostProc) (ClientData data[], Tcl_Interp *interp,
  */
 
 const char *		Tcl_InitStubs(Tcl_Interp *interp, const char *version,
-			    int exact);
+			    int exact, int magic);
 const char *		TclTomMathInitializeStubs(Tcl_Interp *interp,
 			    const char *version, int epoch, int revision);
 
-/*
- * When not using stubs, make it a macro.
- */
-
-#ifndef USE_TCL_STUBS
+#ifdef USE_TCL_STUBS
+#define Tcl_InitStubs(interp, version, exact) \
+    (Tcl_InitStubs)(interp, version, \
+	    (exact)|(TCL_MAJOR_VERSION<<8)|(TCL_MINOR_VERSION<<16), \
+	    TCL_STUB_MAGIC)
+#else
 #define Tcl_InitStubs(interp, version, exact) \
-    Tcl_PkgInitStubsCheck(interp, version, exact)
+    Tcl_PkgInitStubsCheck(interp, version, \
+	    (exact)|(TCL_MAJOR_VERSION<<8)|(TCL_MINOR_VERSION<<16))
 #endif
 
 /*
diff --git a/generic/tclPkg.c b/generic/tclPkg.c
index f6e8b20..86777a8 100644
--- a/generic/tclPkg.c
+++ b/generic/tclPkg.c
@@ -1895,7 +1895,7 @@ Tcl_PkgInitStubsCheck(
 {
     const char *actualVersion = Tcl_PkgPresent(interp, "Tcl", version, 0);
 
-    if (exact && actualVersion) {
+    if ((exact&1) && actualVersion) {
 	const char *p = version;
 	int count = 0;
 
diff --git a/generic/tclStubLib.c b/generic/tclStubLib.c
index 859cbf9..afabdca 100644
--- a/generic/tclStubLib.c
+++ b/generic/tclStubLib.c
@@ -24,13 +24,10 @@ const TclIntStubs *tclIntStubsPtr = NULL;
 const TclIntPlatStubs *tclIntPlatStubsPtr = NULL;
 
 /*
- * Use our own isDigit to avoid linking to libc on windows
+ * Use our own ISDIGIT to avoid linking to libc on windows
  */
 
-static int isDigit(const int c)
-{
-    return (c >= '0' && c <= '9');
-}
+#define ISDIGIT(c) (((unsigned)((c)-'0')) <= 9)
 
 /*
  *----------------------------------------------------------------------
@@ -54,7 +51,8 @@ MODULE_SCOPE const char *
 Tcl_InitStubs(
     Tcl_Interp *interp,
     const char *version,
-    int exact)
+    int exact,
+    int magic)
 {
     Interp *iPtr = (Interp *) interp;
     const char *actualVersion = NULL;
@@ -67,8 +65,8 @@ Tcl_InitStubs(
      * times. [Bug 615304]
      */
 
-    if (!stubsPtr || (stubsPtr->magic != TCL_STUB_MAGIC)) {
-	iPtr->result = "interpreter uses an incompatible stubs mechanism";
+    if (!stubsPtr || (stubsPtr->magic != (((exact&0xff00) >= 0x900) ? magic : TCL_STUB_MAGIC))) {
+	iPtr->result = (char *)"interpreter uses an incompatible stubs mechanism";
 	iPtr->freeProc = TCL_STATIC;
 	return NULL;
     }
@@ -77,12 +75,12 @@ Tcl_InitStubs(
     if (actualVersion == NULL) {
 	return NULL;
     }
-    if (exact) {
+    if (exact&1) {
 	const char *p = version;
 	int count = 0;
 
 	while (*p) {
-	    count += !isDigit(*p++);
+	    count += !ISDIGIT(*p++);
 	}
 	if (count == 1) {
 	    const char *q = actualVersion;
@@ -91,7 +89,7 @@ Tcl_InitStubs(
 	    while (*p && (*p == *q)) {
 		p++; q++;
 	    }
-	    if (*p || isDigit(*q)) {
+	    if (*p || ISDIGIT(*q)) {
 		/* Construct error message */
 		stubsPtr->tcl_PkgRequireEx(interp, "Tcl", version, 1, NULL);
 		return NULL;
-- 
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