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1 /* Checking strncat.
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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 __strncat_chk (char *__restrict__ dest, const char *__restrict__ src,
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45 size_t n, size_t slen)
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46 {
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47 char c;
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48 char *s = dest;
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49
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50 do
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51 {
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52 if (slen-- == 0)
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53 __chk_fail ();
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54 c = *dest++;
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55 }
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56 while (c != '\0');
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57
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58 ++slen;
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59 dest -= 2;
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60
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61 if (n >= 4)
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62 {
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63 size_t n4 = n >> 2;
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64 do
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65 {
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66 if (slen-- == 0)
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67 __chk_fail ();
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68 c = *src++;
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69 *++dest = c;
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70 if (c == '\0')
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71 return s;
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72 if (slen-- == 0)
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73 __chk_fail ();
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74 c = *src++;
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75 *++dest = c;
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76 if (c == '\0')
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77 return s;
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78 if (slen-- == 0)
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79 __chk_fail ();
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80 c = *src++;
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81 *++dest = c;
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82 if (c == '\0')
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83 return s;
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84 if (slen-- == 0)
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85 __chk_fail ();
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86 c = *src++;
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87 *++dest = c;
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88 if (c == '\0')
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89 return s;
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90 } while (--n4 > 0);
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91 n &= 3;
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92 }
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93
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94 while (n > 0)
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95 {
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96 if (slen-- == 0)
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97 __chk_fail ();
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98 c = *src++;
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99 *++dest = c;
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100 if (c == '\0')
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101 return s;
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102 n--;
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103 }
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104
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105 if (c != '\0')
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106 {
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107 if (slen-- == 0)
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108 __chk_fail ();
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109 *++dest = '\0';
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110 }
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111
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112 return s;
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113 }
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