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1 /* Checking strcat.
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145
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2 Copyright (C) 1991-2020 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 #ifdef HAVE_STRING_H
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38 # include <string.h>
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39 #endif
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40
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41 extern void __chk_fail (void) __attribute__((__noreturn__));
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42
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43 char *
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44 __strcat_chk (char *__restrict__ dest, const char *__restrict__ src,
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45 size_t slen)
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46 {
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47 char *s1 = dest;
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48 const char *s2 = src;
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49 char c;
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50
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51 do
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52 {
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53 if (slen-- == 0)
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54 __chk_fail ();
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55 c = *s1++;
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56 }
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57 while (c != '\0');
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58
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59 ++slen;
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60 s1 -= 2;
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61
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62 do
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63 {
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64 if (slen-- == 0)
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65 __chk_fail ();
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66 c = *s2++;
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67 *++s1 = c;
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68 }
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69 while (c != '\0');
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70
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71 return dest;
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72 }
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