1 /* $NetBSD: strerror.c,v 1.1.1.1 2016/01/14 00:11:29 christos Exp $ */
2
3 /* strerror.c --- ANSI C compatible system error routine
4
5 Copyright (C) 1986, 1988, 1989, 1991, 2002, 2003 Free Software
6 Foundation, Inc.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
11 any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software Foundation,
20 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21
22 #if HAVE_CONFIG_H
23 # include <config.h>
24 #endif
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. */
34 int sprintf (char *, char const *, ...);
35 extern int sys_nerr;
36 extern char *sys_errlist[];
37
38 char *
strerror(int n)39 strerror (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