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1 /* Checking macros for stdio functions.
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131
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2 Copyright (C) 2004-2018 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 #ifndef _SSP_STDIO_H
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36 #define _SSP_STDIO_H 1
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37
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38 #include <ssp.h>
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39 #include_next <stdio.h>
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40
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41 #if __SSP_FORTIFY_LEVEL > 0
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42
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43 #include <stdarg.h>
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44
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45 #undef sprintf
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46 #undef vsprintf
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47 #undef snprintf
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48 #undef vsnprintf
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49 #undef gets
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50 #undef fgets
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51
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52 extern int __sprintf_chk (char *__restrict__ __s, int __flag, size_t __slen,
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53 __const char *__restrict__ __format, ...);
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54 extern int __vsprintf_chk (char *__restrict__ __s, int __flag, size_t __slen,
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55 __const char *__restrict__ __format,
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56 va_list __ap);
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57
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58 #define sprintf(str, ...) \
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59 __builtin___sprintf_chk (str, 0, __ssp_bos (str), \
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60 __VA_ARGS__)
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61 #define vsprintf(str, fmt, ap) \
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62 __builtin___vsprintf_chk (str, 0, __ssp_bos (str), fmt, ap)
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63
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64 extern int __snprintf_chk (char *__restrict__ __s, size_t __n, int __flag,
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65 size_t __slen, __const char *__restrict__ __format,
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66 ...);
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67 extern int __vsnprintf_chk (char *__restrict__ __s, size_t __n, int __flag,
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68 size_t __slen, __const char *__restrict__ __format,
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69 va_list __ap);
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70
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71 #define snprintf(str, len, ...) \
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72 __builtin___snprintf_chk (str, len, 0, __ssp_bos (str), __VA_ARGS__)
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73 #define vsnprintf(str, len, fmt, ap) \
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74 __builtin___vsnprintf_chk (str, len, 0, __ssp_bos (str), fmt, ap)
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75
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76 extern char *__gets_chk (char *__str, size_t);
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77 extern char *__SSP_REDIRECT (__gets_alias, (char *__str), gets);
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78
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79 extern inline __attribute__((__always_inline__)) char *
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80 gets (char *__str)
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81 {
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82 if (__ssp_bos (__str) != (size_t) -1)
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83 return __gets_chk (__str, __ssp_bos (__str));
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84 return __gets_alias (__str);
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85 }
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86
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87 extern char *__SSP_REDIRECT (__fgets_alias,
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88 (char *__restrict__ __s, int __n,
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89 FILE *__restrict__ __stream), fgets);
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90
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91 extern inline __attribute__((__always_inline__)) char *
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92 fgets (char *__restrict__ __s, int __n, FILE *__restrict__ __stream)
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93 {
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94 if (__ssp_bos (__s) != (size_t) -1 && (size_t) __n > __ssp_bos (__s))
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95 __chk_fail ();
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96 return __fgets_alias (__s, __n, __stream);
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97 }
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98
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99 #endif /* __SSP_FORTIFY_LEVEL > 0 */
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100 #endif /* _SSP_STDIO_H */
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