+
−/* strerror.c --- POSIX compatible system error routine
+
−
+
−   Copyright (C) 2007-2012 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,
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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
+
−   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 <http://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
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−
+
−char *
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−strerror (int n)
+
−#undef strerror
+
−{
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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.  */
+
−  const char *msg = strerror_override (n);
+
−  if (msg)
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−    return (char *) msg;
+
−
+
−  msg = strerror (n);
+
−
+
−  /* 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.  */
+
−  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 ();
+
−
+
−  return memcpy (buf, msg, len + 1);
+
−}