1169695Skan/* Checking sprintf.
2169695Skan   Copyright (C) 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#include <stdarg.h>
39169695Skan#ifdef HAVE_LIMITS_H
40169695Skan# include <limits.h>
41169695Skan#endif
42169695Skan#ifdef HAVE_STDIO_H
43169695Skan# include <stdio.h>
44169695Skan#endif
45169695Skan
46169695Skanextern void __chk_fail (void) __attribute__((__noreturn__));
47169695Skan
48169695Skan#ifdef HAVE_USABLE_VSNPRINTF
49169695Skanint
50169695Skan__sprintf_chk (char *s, int flags __attribute__((unused)),
51169695Skan	       size_t slen, const char *format, ...)
52169695Skan{
53169695Skan  va_list arg;
54169695Skan  int done;
55169695Skan
56169695Skan  va_start (arg, format);
57169695Skan  if (slen > (size_t) INT_MAX)
58169695Skan    done = vsprintf (s, format, arg);
59169695Skan  else
60169695Skan    {
61169695Skan      done = vsnprintf (s, slen, format, arg);
62169695Skan      if (done >= 0 && (size_t) done >= slen)
63169695Skan	__chk_fail ();
64169695Skan    }
65169695Skan  va_end (arg);
66169695Skan  return done;
67169695Skan}
68169695Skan#endif
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