xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* Copyright (C) 1991-2016 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 | <http://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 | } |