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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#if defined(LIBC_SCCS) && !defined(lint)
31static char sccsid[] = "@(#)strerror.c 8.1 (Berkeley) 6/4/93";
32#endif /* LIBC_SCCS and not lint */
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: head/lib/libc/string/strerror.c 220376 2011-04-05 21:56:05Z jilles $");
35
36#if defined(NLS)
37#include <nl_types.h>
38#endif
39
40#include <limits.h>
41#include <errno.h>
42#include <string.h>
43#include <stdio.h>
44
45#define UPREFIX "Unknown error"
46
47/*
48 * Define a buffer size big enough to describe a 64-bit signed integer
49 * converted to ASCII decimal (19 bytes), with an optional leading sign
50 * (1 byte); finally, we get the prefix, delimiter (": ") and a trailing
51 * NUL from UPREFIX.
52 */
53#define EBUFSIZE (20 + 2 + sizeof(UPREFIX))
54
55/*
56 * Doing this by hand instead of linking with stdio(3) avoids bloat for
57 * statically linked binaries.
58 */
59static void
60errstr(int num, char *uprefix, char *buf, size_t len)
61{
62 char *t;
63 unsigned int uerr;
64 char tmp[EBUFSIZE];
65
66 t = tmp + sizeof(tmp);
67 *--t = '\0';
68 uerr = (num >= 0) ? num : -num;
69 do {
70 *--t = "0123456789"[uerr % 10];
71 } while (uerr /= 10);
72 if (num < 0)
73 *--t = '-';
74 *--t = ' ';
75 *--t = ':';
76 strlcpy(buf, uprefix, len);
77 strlcat(buf, t, len);
78}
79
80int
81strerror_r(int errnum, char *strerrbuf, size_t buflen)
82{
83 int retval = 0;
84#if defined(NLS)
85 int saved_errno = errno;
86 nl_catd catd;
87 catd = catopen("libc", NL_CAT_LOCALE);
88#endif
89
90 if (errnum < 0 || errnum >= sys_nerr) {
91 errstr(errnum,
92#if defined(NLS)
93 catgets(catd, 1, 0xffff, UPREFIX),
94#else
95 UPREFIX,
96#endif
97 strerrbuf, buflen);
98 retval = EINVAL;
99 } else {
100 if (strlcpy(strerrbuf,
101#if defined(NLS)
102 catgets(catd, 1, errnum, sys_errlist[errnum]),
103#else
104 sys_errlist[errnum],
105#endif
106 buflen) >= buflen)
107 retval = ERANGE;
108 }
109
110#if defined(NLS)
111 catclose(catd);
112 errno = saved_errno;
113#endif
114
115 return (retval);
116}
117
118char *
119strerror(int num)
120{
121 static char ebuf[NL_TEXTMAX];
122
123 if (strerror_r(num, ebuf, sizeof(ebuf)) != 0)
124 errno = EINVAL;
125 return (ebuf);
126}