|
0
|
1 /* Checking gets.
|
|
|
2 Copyright (C) 2005, 2009 Free Software Foundation, Inc.
|
|
|
3
|
|
|
4 This file is part of GCC.
|
|
|
5
|
|
|
6 GCC is free software; you can redistribute it and/or modify it under
|
|
|
7 the terms of the GNU General Public License as published by the Free
|
|
|
8 Software Foundation; either version 3, or (at your option) any later
|
|
|
9 version.
|
|
|
10
|
|
|
11 In addition to the permissions in the GNU General Public License, the
|
|
|
12 Free Software Foundation gives you unlimited permission to link the
|
|
|
13 compiled version of this file into combinations with other programs,
|
|
|
14 and to distribute those combinations without any restriction coming
|
|
|
15 from the use of this file. (The General Public License restrictions
|
|
|
16 do apply in other respects; for example, they cover modification of
|
|
|
17 the file, and distribution when not linked into a combine
|
|
|
18 executable.)
|
|
|
19
|
|
|
20 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
|
21 WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
|
22 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
|
23 for more details.
|
|
|
24
|
|
|
25 Under Section 7 of GPL version 3, you are granted additional
|
|
|
26 permissions described in the GCC Runtime Library Exception, version
|
|
|
27 3.1, as published by the Free Software Foundation.
|
|
|
28
|
|
|
29 You should have received a copy of the GNU General Public License and
|
|
|
30 a copy of the GCC Runtime Library Exception along with this program;
|
|
|
31 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
|
32 <http://www.gnu.org/licenses/>. */
|
|
|
33
|
|
|
34
|
|
|
35 #include "config.h"
|
|
|
36 #include <ssp/ssp.h>
|
|
|
37 #include <stdarg.h>
|
|
|
38 #ifdef HAVE_STDLIB_H
|
|
|
39 # include <stdlib.h>
|
|
|
40 #endif
|
|
|
41 #ifdef HAVE_ALLOCA_H
|
|
|
42 # include <alloca.h>
|
|
|
43 #endif
|
|
|
44 #ifdef HAVE_LIMITS_H
|
|
|
45 # include <limits.h>
|
|
|
46 #endif
|
|
|
47 #ifdef HAVE_STDIO_H
|
|
|
48 # include <stdio.h>
|
|
|
49 #endif
|
|
|
50 #ifdef HAVE_STRING_H
|
|
|
51 # include <string.h>
|
|
|
52 #endif
|
|
|
53
|
|
|
54 extern void __chk_fail (void) __attribute__((__noreturn__));
|
|
|
55
|
|
|
56 char *
|
|
|
57 __gets_chk (char *s, size_t slen)
|
|
|
58 {
|
|
|
59 char *ret, *buf;
|
|
|
60
|
|
|
61 if (slen >= (size_t) INT_MAX)
|
|
|
62 return gets (s);
|
|
|
63
|
|
|
64 if (slen <= 8192)
|
|
|
65 buf = alloca (slen + 1);
|
|
|
66 else
|
|
|
67 buf = malloc (slen + 1);
|
|
|
68 if (buf == NULL)
|
|
|
69 return gets (s);
|
|
|
70
|
|
|
71 ret = fgets (buf, (int) (slen + 1), stdin);
|
|
|
72 if (ret != NULL)
|
|
|
73 {
|
|
|
74 size_t len = strlen (buf);
|
|
|
75 if (len > 0 && buf[len - 1] == '\n')
|
|
|
76 --len;
|
|
|
77 if (len == slen)
|
|
|
78 __chk_fail ();
|
|
|
79 memcpy (s, buf, len);
|
|
|
80 s[len] = '\0';
|
|
|
81 ret = s;
|
|
|
82 }
|
|
|
83
|
|
|
84 if (slen > 8192)
|
|
|
85 free (buf);
|
|
|
86 return ret;
|
|
|
87 }
|
