Merged stubs changes into mainline for 8.0

1 files changed, 36 insertions, 1 deletions

diff --git a/win/tclWin32Dll.c b/win/tclWin32Dll.c
index 9de0589..16c47c1 100644
--- a/win/tclWin32Dll.c
+++ b/win/tclWin32Dll.c
@@ -9,7 +9,7 @@
  * See the file "license.terms" for information on usage and redistribution
  * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
  *
- * RCS: @(#) $Id: tclWin32Dll.c,v 1.4 1998/09/14 18:40:19 stanton Exp $
+ * RCS: @(#) $Id: tclWin32Dll.c,v 1.5 1999/03/10 05:52:53 stanton Exp $
  */
 
 #include "tclWinInt.h"
@@ -378,6 +378,41 @@ TclWinGetTclInstance()
 /*
  *----------------------------------------------------------------------
  *
+ * TclpCheckStackSpace --
+ *
+ *	Detect if we are about to blow the stack.  Called before an 
+ *	evaluation can happen when nesting depth is checked.
+ *
+ * Results:
+ *	1 if there is enough stack space to continue; 0 if not.
+ *
+ * Side effects:
+ *	None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+int
+TclpCheckStackSpace()
+{
+    /*
+     * We can recurse only if there is at least TCL_WIN_STACK_THRESHOLD
+     * bytes of stack space left.  alloca() is cheap on windows; basically
+     * it just subtracts from the stack pointer causing the OS to throw an
+     * exception if the stack pointer is set below the bottom of the stack.
+     */
+
+    try {
+	alloca(TCL_WIN_STACK_THRESHOLD);
+	return 1;
+    } except (1) {}
+
+    return 0;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
  * TclWinGetPlatformId --
  *
  *	Determines whether running under NT, 95, or Win32s, to allow