1/*	$NetBSD: strerror.c,v 1.2 2011/02/16 03:46:59 christos Exp $	*/
2
3/*
4 * Copyright (c) 1988, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#if defined(LIBC_SCCS) && !defined(lint)
37static const char sccsid[] = "@(#)strerror.c	8.1 (Berkeley) 6/4/93";
38#endif /* LIBC_SCCS and not lint */
39
40#include <sys/types.h>
41
42#include <string.h>
43
44#include "gnuc.h"
45#ifdef HAVE_OS_PROTO_H
46#include "os-proto.h"
47#endif
48
49char *
50strerror(num)
51	int num;
52{
53	extern int sys_nerr;
54	extern char *sys_errlist[];
55#define	UPREFIX	"Unknown error: "
56	static char ebuf[40] = UPREFIX;		/* 64-bit number + slop */
57	register unsigned int errnum;
58	register char *p, *t;
59	char tmp[40];
60
61	errnum = num;				/* convert to unsigned */
62	if (errnum < sys_nerr)
63		return(sys_errlist[errnum]);
64
65	/* Do this by hand, so we don't include stdio(3). */
66	t = tmp;
67	do {
68		*t++ = "0123456789"[errnum % 10];
69	} while (errnum /= 10);
70	for (p = ebuf + sizeof(UPREFIX) - 1;;) {
71		*p++ = *--t;
72		if (t <= tmp)
73			break;
74	}
75	*p = '\0';
76	return(ebuf);
77}
78