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1 /*-
2 * Copyright (c) 1988, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #if defined(LIBC_SCCS) && !defined(lint)
35 static char sccsid[] = "@(#)strerror.c 8.1 (Berkeley) 6/4/93";
36 #endif /* LIBC_SCCS and not lint */
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD: src/lib/libc/string/strerror.c,v 1.13 2003/05/01 19:03:14 nectar Exp $");
39
40 #include <errno.h>
41 #include <stdio.h>
42 #include <string.h>
43
44 #define UPREFIX "Unknown error: "
45
46 /*
47 * Define a buffer size big enough to describe a 64-bit signed integer
48 * converted to ASCII decimal (19 bytes), with an optional leading sign
49 * (1 byte); finally, we get the prefix and a trailing NUL from UPREFIX.
50 */
51 #define EBUFSIZE (20 + sizeof(UPREFIX))
52
53 /*
54 * Doing this by hand instead of linking with stdio(3) avoids bloat for
55 * statically linked binaries.
56 */
57 static void
58 errstr(int num, char *buf, size_t len)
59 {
60 char *t;
61 unsigned int uerr;
62 char tmp[EBUFSIZE];
63
64 t = tmp + sizeof(tmp);
65 *--t = '\0';
66 uerr = (num >= 0) ? num : -num;
67 do {
68 *--t = "0123456789"[uerr % 10];
69 } while (uerr /= 10);
70 if (num < 0)
71 *--t = '-';
72 strlcpy(buf, UPREFIX, len);
73 strlcat(buf, t, len);
74 }
75
76 int
77 strerror_r(int errnum, char *strerrbuf, size_t buflen)
78 {
79
80 if (errnum < 1 || errnum >= sys_nerr) {
81 errstr(errnum, strerrbuf, buflen);
82 return (EINVAL);
83 }
84 if (strlcpy(strerrbuf, sys_errlist[errnum], buflen) >= buflen)
85 return (ERANGE);
86 return (0);
87 }
88
89 char *
90 strerror(int num)
91 {
92 static char ebuf[EBUFSIZE];
93
94 if (num > 0 && num < sys_nerr)
95 return ((char *)sys_errlist[num]);
96 errno = EINVAL;
97 errstr(num, ebuf, sizeof(ebuf));
98 return (ebuf);
99 }