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 <assert.h> |
19 | #include <errno.h> |
20 | #include <stdio.h> |
21 | #include <string.h> |
22 | #include <sys/param.h> |
23 | |
24 | |
25 | /* Fill buf with a string describing the errno code in ERRNUM. */ |
26 | int |
27 | __xpg_strerror_r (int errnum, char *buf, size_t buflen) |
28 | { |
29 | const char *estr = __strerror_r (errnum, buf, buflen); |
30 | |
31 | /* We know that __strerror_r returns buf (with a dynamically computed |
32 | string) if errnum is invalid, otherwise it returns a string whose |
33 | storage has indefinite extent. */ |
34 | if (estr == buf) |
35 | { |
36 | assert (errnum < 0 || errnum >= _sys_nerr_internal |
37 | || _sys_errlist_internal[errnum] == NULL); |
38 | return EINVAL; |
39 | } |
40 | else |
41 | { |
42 | assert (errnum >= 0 && errnum < _sys_nerr_internal |
43 | && _sys_errlist_internal[errnum] != NULL); |
44 | |
45 | size_t estrlen = strlen (estr); |
46 | |
47 | /* Terminate the string in any case. */ |
48 | if (buflen > 0) |
49 | *((char *) __mempcpy (buf, estr, MIN (buflen - 1, estrlen))) = '\0'; |
50 | |
51 | return buflen <= estrlen ? ERANGE : 0; |
52 | } |
53 | } |
54 | |