1/* strerror.c --- ANSI C compatible system error routine
2
3   Copyright (C) 1986, 1988-1989, 1991, 2002-2003, 2005 Free Software
4   Foundation, Inc.
5
6   This program is free software; you can redistribute it and/or modify
7   it under the terms of the GNU General Public License as published by
8   the Free Software Foundation; either version 2, or (at your option)
9   any later version.
10
11   This program is distributed in the hope that it will be useful,
12   but WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14   GNU General Public License for more details.
15
16   You should have received a copy of the GNU General Public License
17   along with this program; if not, write to the Free Software Foundation,
18   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
19
20#ifdef HAVE_CONFIG_H
21# include <config.h>
22#endif
23
24#if !HAVE_STRERROR
25
26#include <limits.h>
27
28/* Don't include <stdio.h>, since it may or may not declare
29   sys_errlist and its declarations may collide with ours.  Just
30   declare the stuff that we need directly.  Standard hosted C89
31   implementations define strerror and they don't need this strerror
32   function, so take some liberties with the standard to cater to
33   ancient or limited freestanding implementations.  */
34int sprintf (char *, char const *, ...);
35extern int sys_nerr;
36extern char *sys_errlist[];
37
38char *
39strerror (int n)
40{
41  static char const fmt[] = "Unknown error (%d)";
42  static char mesg[sizeof fmt + sizeof n * CHAR_BIT / 3];
43
44  if (n < 0 || n >= sys_nerr)
45    {
46      sprintf (mesg, fmt, n);
47      return mesg;
48    }
49  else
50    return sys_errlist[n];
51}
52
53#else
54
55/* This declaration is solely to ensure that after preprocessing
56   this file is never empty.  */
57typedef int dummy;
58
59#endif
60