1 #include "config.h"
2 #ifndef HAVE_STRERROR
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 #ifndef lint
37 static const char rcsid[] =
38 "$FreeBSD: src/lib/libc/string/strerror.c,v 1.3 2001/05/24 08:47:41 obrien Exp $";
39 #endif
40
41 #include <stdio.h>
42 #include <string.h>
43
44 char *
strerror(num)45 strerror(num)
46 int num;
47 {
48 #define UPREFIX "Unknown error: "
49 static char ebuf[40] = UPREFIX; /* 64-bit number + slop */
50 register unsigned int errnum;
51 register char *p, *t;
52 char tmp[40];
53
54 errnum = num; /* convert to unsigned */
55 if (errnum < sys_nerr)
56 return ((char *)sys_errlist[errnum]);
57
58 /* Do this by hand, so we don't link to stdio(3). */
59 t = tmp;
60 if (num < 0)
61 errnum = -errnum;
62 do {
63 *t++ = "0123456789"[errnum % 10];
64 } while (errnum /= 10);
65 if (num < 0)
66 *t++ = '-';
67 for (p = ebuf + sizeof(UPREFIX) - 1;;) {
68 *p++ = *--t;
69 if (t <= tmp)
70 break;
71 }
72 *p = '\0';
73 return (ebuf);
74 }
75 #endif /* HAVE_STRERROR */
76