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1 /* Checking gets.
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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_STDLIB_H
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39 # include <stdlib.h>
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40 #endif
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41 #ifdef HAVE_ALLOCA_H
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42 # include <alloca.h>
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43 #endif
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44 #ifdef HAVE_LIMITS_H
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45 # include <limits.h>
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46 #endif
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47 #ifdef HAVE_STDIO_H
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48 # include <stdio.h>
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49 #endif
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50 #ifdef HAVE_STRING_H
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51 # include <string.h>
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52 #endif
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53
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111
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54 #if !(!defined __USE_ISOC11 \
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55 || (defined __cplusplus && __cplusplus <= 201103L))
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56 extern char *gets (char *);
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57 #endif
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58
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0
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59 extern void __chk_fail (void) __attribute__((__noreturn__));
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60
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61 char *
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62 __gets_chk (char *s, size_t slen)
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63 {
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64 char *ret, *buf;
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65
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66 if (slen >= (size_t) INT_MAX)
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67 return gets (s);
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68
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69 if (slen <= 8192)
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70 buf = alloca (slen + 1);
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71 else
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72 buf = malloc (slen + 1);
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73 if (buf == NULL)
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74 return gets (s);
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75
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76 ret = fgets (buf, (int) (slen + 1), stdin);
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77 if (ret != NULL)
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78 {
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79 size_t len = strlen (buf);
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80 if (len > 0 && buf[len - 1] == '\n')
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81 --len;
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82 if (len == slen)
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83 __chk_fail ();
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84 memcpy (s, buf, len);
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85 s[len] = '\0';
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86 ret = s;
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87 }
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88
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89 if (slen > 8192)
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90 free (buf);
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91 return ret;
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92 }
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