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1 | /* Copyright (C) 2005-2019 Free Software Foundation, Inc. | |
2 | This file is part of the GNU C Library. | |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
15 | License along with the GNU C Library; if not, see | |
16 | <https://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #include <limits.h> | |
19 | #include <stdlib.h> | |
20 | #include <string.h> | |
21 | #include <unistd.h> | |
22 | ||
23 | ||
24 | char * | |
25 | __realpath_chk (const char *buf, char *resolved, size_t resolvedlen) | |
26 | { | |
27 | #ifdef PATH_MAX | |
28 | if (resolvedlen < PATH_MAX) | |
29 | __chk_fail (); | |
30 | ||
31 | return __realpath (buf, resolved); | |
32 | #else | |
33 | long int pathmax =__pathconf (buf, _PC_PATH_MAX); | |
34 | if (pathmax != -1) | |
35 | { | |
36 | /* We do have a fixed limit. */ | |
37 | if (resolvedlen < pathmax) | |
38 | __chk_fail (); | |
39 | ||
40 | return __realpath (buf, resolved); | |
41 | } | |
42 | ||
43 | /* Since there is no fixed limit we check whether the size is large | |
44 | enough. */ | |
45 | char *res = __realpath (buf, NULL); | |
46 | if (res != NULL) | |
47 | { | |
48 | size_t actlen = strlen (res) + 1; | |
49 | if (actlen > resolvedlen) | |
50 | __chk_fail (); | |
51 | ||
52 | memcpy (resolved, res, actlen); | |
53 | free (res); | |
54 | res = resolved; | |
55 | } | |
56 | ||
57 | return res; | |
58 | #endif | |
59 | } |