--- Libc/Libc-1725.40.4/secure/strncpy_chk.c
+++ Libc/Libc-583/secure/strncpy_chk.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2007-2013 Apple Inc. All rights reserved.
+ * Copyright (c) 2007 Apple Inc. All rights reserved.
  *
  * @APPLE_LICENSE_HEADER_START@
  *
@@ -23,26 +23,15 @@
 
 #include <stdlib.h>
 #include <string.h>
-#include "secure.h"
 
-char *
+extern void __chk_fail (void) __attribute__((__noreturn__));
+
+void *
 __strncpy_chk (char *restrict dest, char *restrict src,
 	       size_t len, size_t dstlen)
 {
-  size_t n;
+  if (__builtin_expect (dstlen < len, 0))
+    __chk_fail ();
 
-  if (__builtin_expect (dstlen < len, 0))
-    __chk_fail_overflow ();
-
-  // stpncpy normally returns a pointer to the \0
-  n = stpncpy (dest, src, len) - dest + 1;
-
-  // Check if it's pointing to the location after the buffer after not writing \0
-  if (n == len + 1)
-    n--;
-
-  if (__builtin_expect (__chk_assert_no_overlap != 0, 1))
-    __chk_overlap(dest, n, src, n);
-
-  return dest;
+  return strncpy (dest, src, len);
 }