--- Libc/Libc-763.13/secure/vsnprintf_chk.c
+++ Libc/Libc-1353.11.2/secure/vsnprintf_chk.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2007 Apple Inc. All rights reserved.
+ * Copyright (c) 2007-2013 Apple Inc. All rights reserved.
  *
  * @APPLE_LICENSE_HEADER_START@
  *
@@ -25,22 +25,18 @@
 #include <stdio.h>
 #include <stdarg.h>
 #include <limits.h>
-
-extern void __chk_fail (void) __attribute__((__noreturn__));
-extern int __vsnprintf_chk (char * __restrict, size_t, int, size_t,
-                            const char * __restrict, va_list arg)
-  __DARWIN_LDBL_COMPAT (__vsnprintf_chk);
+#include "secure.h"
 
 int
-__vsnprintf_chk (char *s, size_t maxlen, int flags, size_t len,
+__vsnprintf_chk (char *dest, size_t len, int flags, size_t dstlen,
 		const char *format, va_list arg)
 {
   int done;
 
-  if (maxlen > len)
-    __chk_fail ();
+  if (__builtin_expect (dstlen < len, 0))
+    __chk_fail_overflow ();
 
-  done = vsnprintf (s, maxlen, format, arg);
+  done = vsnprintf (dest, len, format, arg);
 
   return done;
 }