--- /dev/null
+++ Libc/Libc-997.90.3/secure/vsprintf_chk.c
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2007-2013 Apple Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <limits.h>
+#include "secure.h"
+
+int
+__vsprintf_chk (char *dest, int flags, size_t dstlen, const char *format,
+		va_list arg)
+{
+  int done;
+
+  if (__builtin_expect (dstlen > (size_t) INT_MAX, 0))
+    done = vsprintf (dest, format, arg);
+  else
+    {
+      done = vsnprintf (dest, dstlen, format, arg);
+      if (__builtin_expect (done >= 0 && (size_t) done >= dstlen, 0))
+        __chk_fail_overflow ();
+    }
+
+  return done;
+}