From 2f15b25da2060ab723e0bb82a8f4f713d547b2b8 Mon Sep 17 00:00:00 2001
From: Fredrik Lundh <fredrik@pythonware.com>
Date: Sun, 27 Aug 2000 19:15:31 +0000
Subject: implements PyOS_CheckStack for Windows and MSVC.  this fixes a couple
 of potential stack overflows, including bug #110615.

closes patch #101238
---
 Python/pythonrun.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

(limited to 'Python/pythonrun.c')

diff --git a/Python/pythonrun.c b/Python/pythonrun.c
index 8d571c369c..e951ccd1b7 100644
--- a/Python/pythonrun.c
+++ b/Python/pythonrun.c
@@ -1165,3 +1165,32 @@ Py_FdIsInteractive(FILE *fp, char *filename)
 	       (strcmp(filename, "<stdin>") == 0) ||
 	       (strcmp(filename, "???") == 0);
 }
+
+
+#if defined(USE_STACKCHECK) 
+#if defined(WIN32) && defined(_MSC_VER)
+
+/* Stack checking for Microsoft C */
+
+#include <malloc.h>
+#include <excpt.h>
+
+int
+PyOS_CheckStack()
+{
+	__try {
+		/* _alloca throws a stack overflow exception if there's
+		   not enough space left on the stack */
+		_alloca(PYOS_STACK_MARGIN * sizeof(void*));
+		return 0;
+	} __except (EXCEPTION_EXECUTE_HANDLER) {
+		/* just ignore all errors */
+	}
+	return 1;
+}
+
+#endif /* WIN32 && _MSC_VER */
+
+/* Alternate implementations can be added here... */
+
+#endif /* USE_STACKCHECK */
-- 
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