72 lines
2 KiB
C
72 lines
2 KiB
C
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/* strerror.c --- POSIX compatible system error routine
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Copyright (C) 2007-2021 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 <https://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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