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dff8da6b | 1 | /* Copyright (C) 2005-2024 Free Software Foundation, Inc. |
b799f91d UD |
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 | |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
b799f91d UD |
17 | |
18 | #include <limits.h> | |
19 | #include <stdlib.h> | |
20 | #include <string.h> | |
21 | #include <unistd.h> | |
2345bc44 | 22 | #include <errno.h> |
b799f91d UD |
23 | |
24 | ||
25 | char * | |
26 | __realpath_chk (const char *buf, char *resolved, size_t resolvedlen) | |
27 | { | |
28 | #ifdef PATH_MAX | |
29 | if (resolvedlen < PATH_MAX) | |
30 | __chk_fail (); | |
31 | ||
32 | return __realpath (buf, resolved); | |
33 | #else | |
2345bc44 ST |
34 | long int pathmax; |
35 | ||
36 | if (buf == NULL) | |
37 | { | |
38 | __set_errno (EINVAL); | |
39 | return NULL; | |
40 | } | |
41 | ||
42 | pathmax = __pathconf (buf, _PC_PATH_MAX); | |
b799f91d UD |
43 | if (pathmax != -1) |
44 | { | |
45 | /* We do have a fixed limit. */ | |
46 | if (resolvedlen < pathmax) | |
47 | __chk_fail (); | |
48 | ||
49 | return __realpath (buf, resolved); | |
50 | } | |
51 | ||
52 | /* Since there is no fixed limit we check whether the size is large | |
53 | enough. */ | |
54 | char *res = __realpath (buf, NULL); | |
55 | if (res != NULL) | |
56 | { | |
57 | size_t actlen = strlen (res) + 1; | |
58 | if (actlen > resolvedlen) | |
59 | __chk_fail (); | |
60 | ||
61 | memcpy (resolved, res, actlen); | |
62 | free (res); | |
63 | res = resolved; | |
64 | } | |
65 | ||
66 | return res; | |
67 | #endif | |
68 | } |