1169695Skan/* Checking strcat.
2169695Skan   Copyright (C) 1991, 1997, 2003, 2004, 2005 Free Software Foundation, Inc.
3169695Skan
4169695SkanThis file is part of GCC.
5169695Skan
6169695SkanGCC is free software; you can redistribute it and/or modify it under
7169695Skanthe terms of the GNU General Public License as published by the Free
8169695SkanSoftware Foundation; either version 2, or (at your option) any later
9169695Skanversion.
10169695Skan
11169695SkanIn addition to the permissions in the GNU General Public License, the
12169695SkanFree Software Foundation gives you unlimited permission to link the
13169695Skancompiled version of this file into combinations with other programs,
14169695Skanand to distribute those combinations without any restriction coming
15169695Skanfrom the use of this file.  (The General Public License restrictions
16169695Skando apply in other respects; for example, they cover modification of
17169695Skanthe file, and distribution when not linked into a combine
18169695Skanexecutable.)
19169695Skan
20169695SkanGCC is distributed in the hope that it will be useful, but WITHOUT ANY
21169695SkanWARRANTY; without even the implied warranty of MERCHANTABILITY or
22169695SkanFITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
23169695Skanfor more details.
24169695Skan
25169695SkanYou should have received a copy of the GNU General Public License
26169695Skanalong with GCC; see the file COPYING.  If not, write to the Free
27169695SkanSoftware Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
28169695Skan02110-1301, USA.  */
29169695Skan
30169695Skan/* As a special exception, if you link this library with files compiled with
31169695Skan   GCC to produce an executable, this does not cause the resulting executable
32169695Skan   to be covered by the GNU General Public License. This exception does not
33169695Skan   however invalidate any other reasons why the executable file might be
34169695Skan   covered by the GNU General Public License.  */
35169695Skan
36169695Skan#include "config.h"
37169695Skan#include <ssp/ssp.h>
38169695Skan#ifdef HAVE_STRING_H
39169695Skan# include <string.h>
40169695Skan#endif
41169695Skan
42169695Skanextern void __chk_fail (void) __attribute__((__noreturn__));
43169695Skan
44169695Skanchar *
45169695Skan__strcat_chk (char *__restrict__ dest, const char *__restrict__ src,
46169695Skan              size_t slen)
47169695Skan{
48169695Skan  char *s1 = dest;
49169695Skan  const char *s2 = src;
50169695Skan  char c;
51169695Skan
52169695Skan  do
53169695Skan    {
54169695Skan      if (slen-- == 0)
55169695Skan        __chk_fail ();
56169695Skan      c = *s1++;
57169695Skan    }
58169695Skan  while (c != '\0');
59169695Skan
60169695Skan  ++slen;
61169695Skan  s1 -= 2;
62169695Skan
63169695Skan  do
64169695Skan    {
65169695Skan      if (slen-- == 0)
66169695Skan        __chk_fail ();
67169695Skan      c = *s2++;
68169695Skan      *++s1 = c;
69169695Skan    }
70169695Skan  while (c != '\0');
71169695Skan
72169695Skan  return dest;
73169695Skan}
74