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71 lines
2.0 KiB
71 lines
2.0 KiB
/* strerror.c --- POSIX compatible system error routine |
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Copyright (C) 2007-2017 Free Software Foundation, Inc. |
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 3 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
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#include <config.h> |
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/* Specification. */ |
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#include <string.h> |
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#include <errno.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include "intprops.h" |
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#include "strerror-override.h" |
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#include "verify.h" |
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/* Use the system functions, not the gnulib overrides in this file. */ |
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#undef sprintf |
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char * |
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strerror (int n) |
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#undef strerror |
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{ |
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static char buf[STACKBUF_LEN]; |
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size_t len; |
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/* Cast away const, due to the historical signature of strerror; |
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callers should not be modifying the string. */ |
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const char *msg = strerror_override (n); |
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if (msg) |
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return (char *) msg; |
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msg = strerror (n); |
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/* Our strerror_r implementation might use the system's strerror |
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buffer, so all other clients of strerror have to see the error |
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copied into a buffer that we manage. This is not thread-safe, |
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even if the system strerror is, but portable programs shouldn't |
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be using strerror if they care about thread-safety. */ |
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if (!msg || !*msg) |
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{ |
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static char const fmt[] = "Unknown error %d"; |
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verify (sizeof buf >= sizeof (fmt) + INT_STRLEN_BOUND (n)); |
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sprintf (buf, fmt, n); |
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errno = EINVAL; |
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return buf; |
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} |
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/* Fix STACKBUF_LEN if this ever aborts. */ |
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len = strlen (msg); |
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if (sizeof buf <= len) |
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abort (); |
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memcpy (buf, msg, len + 1); |
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return buf; |
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}
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