| /* Copyright (C) 1991-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <assert.h> |
| #include <errno.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <sys/param.h> |
| |
| |
| /* Fill buf with a string describing the errno code in ERRNUM. */ |
| int |
| __xpg_strerror_r (int errnum, char *buf, size_t buflen) |
| { |
| const char *estr = __strerror_r (errnum, buf, buflen); |
| |
| /* We know that __strerror_r returns buf (with a dynamically computed |
| string) if errnum is invalid, otherwise it returns a string whose |
| storage has indefinite extent. */ |
| if (estr == buf) |
| { |
| assert (errnum < 0 || errnum >= _sys_nerr_internal |
| || _sys_errlist_internal[errnum] == NULL); |
| return EINVAL; |
| } |
| else |
| { |
| assert (errnum >= 0 && errnum < _sys_nerr_internal |
| && _sys_errlist_internal[errnum] != NULL); |
| |
| size_t estrlen = strlen (estr); |
| |
| /* Terminate the string in any case. */ |
| if (buflen > 0) |
| *((char *) __mempcpy (buf, estr, MIN (buflen - 1, estrlen))) = '\0'; |
| |
| return buflen <= estrlen ? ERANGE : 0; |
| } |
| } |