strerror_r.c revision 1.4 
1/*	$NetBSD: strerror_r.c,v 1.4 2017/01/10 20:25:48 christos Exp $	*/
2
3/*
4 * Copyright (c) 1988 Regents of the University of California.
5 * 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#include <sys/cdefs.h>
33__RCSID("$NetBSD: strerror_r.c,v 1.4 2017/01/10 20:25:48 christos Exp $");
34
35#include "namespace.h"
36#include <assert.h>
37#include <errno.h>
38#include <stdio.h>
39#include <string.h>
40#include <stdio.h>	/* for sys_nerr on FreeBSD */
41#ifdef NLS
42#include <limits.h>
43#include <nl_types.h>
44#define __SETLOCALE_SOURCE__
45#include <locale.h>
46#include "setlocale_local.h"
47#endif
48
49#include "extern.h"
50
51__weak_alias(strerror_r, _strerror_r)
52
53int
54_strerror_lr(int num, char *buf, size_t buflen, locale_t loc)
55{
56#define	UPREFIX	"Unknown error: %u"
57	unsigned int errnum = num;
58	int retval = 0;
59	size_t slen;
60#ifdef NLS
61	int saved_errno = errno;
62	nl_catd catd;
63	catd = catopen_l("libc", NL_CAT_LOCALE, loc);
64#endif
65	_DIAGASSERT(buf != NULL);
66
67	if (errnum < (unsigned int) sys_nerr) {
68#ifdef NLS
69		slen = strlcpy(buf, catgets(catd, 1, (int)errnum,
70		    sys_errlist[errnum]), buflen);
71#else
72		slen = strlcpy(buf, sys_errlist[errnum], buflen);
73#endif
74	} else {
75#ifdef NLS
76		slen = snprintf_l(buf, buflen, loc,
77		    catgets(catd, 1, 0xffff, UPREFIX), errnum);
78#else
79		slen = snprintf(buf, buflen, UPREFIX, errnum);
80#endif
81		retval = EINVAL;
82	}
83
84	if (slen >= buflen)
85		retval = ERANGE;
86
87#ifdef NLS
88	catclose(catd);
89	errno = saved_errno;
90#endif
91
92	return retval;
93}
94
95int
96strerror_r(int num, char *buf, size_t buflen)
97{
98#ifdef NLS
99	return _strerror_lr(num, buf, buflen, _current_locale());
100#else
101	return _strerror_lr(num, buf, buflen, NULL);
102#endif
103}
104