--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libssp/strncat-chk.c	Fri Jul 17 14:47:48 2009 +0900
@@ -0,0 +1,119 @@
+/* Checking strncat.
+   Copyright (C) 1991, 1997, 2003, 2004, 2005, 2009 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+In addition to the permissions in the GNU General Public License, the
+Free Software Foundation gives you unlimited permission to link the
+compiled version of this file into combinations with other programs,
+and to distribute those combinations without any restriction coming
+from the use of this file.  (The General Public License restrictions
+do apply in other respects; for example, they cover modification of
+the file, and distribution when not linked into a combine
+executable.)
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+
+#include "config.h"
+#include <ssp/ssp.h>
+#ifdef HAVE_STRING_H
+# include <string.h>
+#endif
+
+extern void __chk_fail (void) __attribute__((__noreturn__));
+
+char *
+__strncat_chk (char *__restrict__ dest, const char *__restrict__ src,
+               size_t n, size_t slen)
+{
+  char c;
+  char *s = dest;
+
+  do
+    {
+      if (slen-- == 0)
+        __chk_fail ();
+      c = *dest++;
+    }
+  while (c != '\0');
+
+  ++slen;
+  dest -= 2;
+
+  if (n >= 4)
+    {
+      size_t n4 = n >> 2;
+      do
+        {
+          if (slen-- == 0)
+            __chk_fail ();
+          c = *src++;
+          *++dest = c;
+          if (c == '\0')
+            return s;
+          if (slen-- == 0)
+            __chk_fail ();
+          c = *src++;
+          *++dest = c;
+          if (c == '\0')
+            return s;
+          if (slen-- == 0)
+            __chk_fail ();
+          c = *src++;
+          *++dest = c;
+          if (c == '\0')
+            return s;
+          if (slen-- == 0)
+            __chk_fail ();
+          c = *src++;
+          *++dest = c;
+          if (c == '\0')
+            return s;
+          if (slen-- == 0)
+            __chk_fail ();
+          c = *src++;
+          *++dest = c;
+          if (c == '\0')
+            return s;
+        } while (--n4 > 0);
+      n &= 3;
+    }
+
+  while (n > 0)
+    {
+      if (slen-- == 0)
+        __chk_fail ();
+      c = *src++;
+      *++dest = c;
+      if (c == '\0')
+        return s;
+      n--;
+    }
+
+  if (c != '\0')
+    {
+      if (slen-- == 0)
+        __chk_fail ();
+      *++dest = '\0';
+    }
+
+  return s;
+}