1 /*	$NetBSD: strerror.c,v 1.1.1.3 2014/12/10 03:34:34 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. Neither the name of the University nor the names of its contributors
16  *    may be used to endorse or promote products derived from this software
17  *    without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  */
31 
32 #if defined(LIBC_SCCS) && !defined(lint)
33 static const char sccsid[] = "@(#)strerror.c	8.1 (Berkeley) 6/4/93";
34 #endif /* LIBC_SCCS and not lint */
35 
36 #include <sys/types.h>
37 
38 #include <string.h>
39 
40 #include "gnuc.h"
41 #ifdef HAVE_OS_PROTO_H
42 #include "os-proto.h"
43 #endif
44 
45 char *
strerror(num)46 strerror(num)
47 	int num;
48 {
49 	extern int sys_nerr;
50 	extern char *sys_errlist[];
51 #define	UPREFIX	"Unknown error: "
52 	static char ebuf[40] = UPREFIX;		/* 64-bit number + slop */
53 	register unsigned int errnum;
54 	register char *p, *t;
55 	char tmp[40];
56 
57 	errnum = num;				/* convert to unsigned */
58 	if (errnum < sys_nerr)
59 		return(sys_errlist[errnum]);
60 
61 	/* Do this by hand, so we don't include stdio(3). */
62 	t = tmp;
63 	do {
64 		*t++ = "0123456789"[errnum % 10];
65 	} while (errnum /= 10);
66 	for (p = ebuf + sizeof(UPREFIX) - 1;;) {
67 		*p++ = *--t;
68 		if (t <= tmp)
69 			break;
70 	}
71 	*p = '\0';
72 	return(ebuf);
73 }
74