1 | /* Copyright (C) 1991-2020 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 <libintl.h> |
19 | #include <stdio.h> |
20 | #include <string.h> |
21 | #include <errno.h> |
22 | |
23 | /* Return a string describing the errno code in ERRNUM. |
24 | The storage is good only until the next call to strerror. |
25 | Writing to the storage causes undefined behavior. */ |
26 | libc_freeres_ptr (static char *buf); |
27 | |
28 | char * |
29 | strerror (int errnum) |
30 | { |
31 | char *ret = __strerror_r (errnum, NULL, 0); |
32 | int saved_errno; |
33 | |
34 | if (__glibc_likely (ret != NULL)) |
35 | return ret; |
36 | saved_errno = errno; |
37 | if (buf == NULL) |
38 | buf = malloc (1024); |
39 | __set_errno (saved_errno); |
40 | if (buf == NULL) |
41 | return _("Unknown error" ); |
42 | return __strerror_r (errnum, buf, 1024); |
43 | } |
44 | |