| /* strerror.c --- POSIX compatible system error routine |
| |
| Copyright (C) 2007-2019 Free Software Foundation, Inc. |
| |
| This program is free software: you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program 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 General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| |
| #include <config.h> |
| |
| /* Specification. */ |
| #include <string.h> |
| |
| #include <errno.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include "intprops.h" |
| #include "strerror-override.h" |
| #include "verify.h" |
| |
| /* Use the system functions, not the gnulib overrides in this file. */ |
| #undef sprintf |
| |
| char * |
| strerror (int n) |
| #undef strerror |
| { |
| static char buf[STACKBUF_LEN]; |
| size_t len; |
| |
| /* Cast away const, due to the historical signature of strerror; |
| callers should not be modifying the string. */ |
| const char *msg = strerror_override (n); |
| if (msg) |
| return (char *) msg; |
| |
| msg = strerror (n); |
| |
| /* Our strerror_r implementation might use the system's strerror |
| buffer, so all other clients of strerror have to see the error |
| copied into a buffer that we manage. This is not thread-safe, |
| even if the system strerror is, but portable programs shouldn't |
| be using strerror if they care about thread-safety. */ |
| if (!msg || !*msg) |
| { |
| static char const fmt[] = "Unknown error %d"; |
| verify (sizeof buf >= sizeof (fmt) + INT_STRLEN_BOUND (n)); |
| sprintf (buf, fmt, n); |
| errno = EINVAL; |
| return buf; |
| } |
| |
| /* Fix STACKBUF_LEN if this ever aborts. */ |
| len = strlen (msg); |
| if (sizeof buf <= len) |
| abort (); |
| |
| memcpy (buf, msg, len + 1); |
| return buf; |
| } |