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1 /* Checking sprintf.
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145
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2 Copyright (C) 2005-2020 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 In addition to the permissions in the GNU General Public License, the
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12 Free Software Foundation gives you unlimited permission to link the
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13 compiled version of this file into combinations with other programs,
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14 and to distribute those combinations without any restriction coming
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15 from the use of this file. (The General Public License restrictions
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16 do apply in other respects; for example, they cover modification of
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17 the file, and distribution when not linked into a combine
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18 executable.)
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19
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20 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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21 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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22 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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23 for more details.
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24
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25 Under Section 7 of GPL version 3, you are granted additional
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26 permissions described in the GCC Runtime Library Exception, version
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27 3.1, as published by the Free Software Foundation.
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28
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29 You should have received a copy of the GNU General Public License and
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30 a copy of the GCC Runtime Library Exception along with this program;
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31 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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32 <http://www.gnu.org/licenses/>. */
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33
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34
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35 #include "config.h"
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36 #include <ssp/ssp.h>
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37 #include <stdarg.h>
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38 #ifdef HAVE_LIMITS_H
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39 # include <limits.h>
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40 #endif
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41 #ifdef HAVE_STDIO_H
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42 # include <stdio.h>
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43 #endif
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44
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45 extern void __chk_fail (void) __attribute__((__noreturn__));
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46
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47 #ifdef HAVE_USABLE_VSNPRINTF
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48 int
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49 __sprintf_chk (char *s, int flags __attribute__((unused)),
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50 size_t slen, const char *format, ...)
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51 {
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52 va_list arg;
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53 int done;
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54
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55 va_start (arg, format);
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56 if (slen > (size_t) INT_MAX)
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57 done = vsprintf (s, format, arg);
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58 else
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59 {
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60 done = vsnprintf (s, slen, format, arg);
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61 if (done >= 0 && (size_t) done >= slen)
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62 __chk_fail ();
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63 }
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64 va_end (arg);
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65 return done;
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66 }
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67 #endif
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