1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
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)
33static char sccsid[] = "@(#)strerror.c	8.1 (Berkeley) 6/4/93";
34#endif /* LIBC_SCCS and not lint */
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD$");
37
38#if defined(NLS)
39#include <nl_types.h>
40#endif
41
42#include <limits.h>
43#include <errno.h>
44#include <string.h>
45#include <stdio.h>
46
47#include "errlst.h"
48#include "../locale/xlocale_private.h"
49#include "libc_private.h"
50
51/*
52 * Define buffer big enough to contain delimiter (": ", 2 bytes),
53 * 64-bit signed integer converted to ASCII decimal (19 bytes) with
54 * optional leading sign (1 byte), and a trailing NUL.
55 */
56#define	EBUFSIZE	(2 + 19 + 1 + 1)
57
58/*
59 * Doing this by hand instead of linking with stdio(3) avoids bloat for
60 * statically linked binaries.
61 */
62static void
63errstr(int num, const char *uprefix, char *buf, size_t len)
64{
65	char *t;
66	unsigned int uerr;
67	char tmp[EBUFSIZE];
68
69	t = tmp + sizeof(tmp);
70	*--t = '\0';
71	uerr = (num >= 0) ? num : -num;
72	do {
73		*--t = "0123456789"[uerr % 10];
74	} while (uerr /= 10);
75	if (num < 0)
76		*--t = '-';
77	*--t = ' ';
78	*--t = ':';
79	strlcpy(buf, uprefix, len);
80	strlcat(buf, t, len);
81}
82
83static int
84strerror_rl(int errnum, char *strerrbuf, size_t buflen, locale_t locale)
85{
86	int retval = 0;
87#if defined(NLS)
88	int saved_errno = errno;
89	nl_catd catd;
90
91	catd = __catopen_l("libc", NL_CAT_LOCALE, locale);
92#endif
93
94	if (errnum < 0 || errnum >= __hidden_sys_nerr) {
95		errstr(errnum,
96#if defined(NLS)
97		    catgets(catd, 1, 0xffff, __uprefix),
98#else
99		    __uprefix,
100#endif
101		   strerrbuf, buflen);
102		retval = EINVAL;
103	} else {
104		if (strlcpy(strerrbuf,
105#if defined(NLS)
106		    catgets(catd, 1, errnum, __hidden_sys_errlist[errnum]),
107#else
108		    __hidden_sys_errlist[errnum],
109#endif
110		    buflen) >= buflen)
111			retval = ERANGE;
112	}
113
114#if defined(NLS)
115	catclose(catd);
116	errno = saved_errno;
117#endif
118
119	return (retval);
120}
121
122int
123strerror_r(int errnum, char *strerrbuf, size_t buflen)
124{
125	return (strerror_rl(errnum, strerrbuf, buflen, __get_locale()));
126}
127
128char *
129strerror_l(int num, locale_t locale)
130{
131#ifndef __NO_TLS
132	static _Thread_local char ebuf[NL_TEXTMAX];
133
134	if (strerror_rl(num, ebuf, sizeof(ebuf), locale) != 0)
135		errno = EINVAL;
136	return (ebuf);
137#else
138	errno = ENOTSUP;
139	return (NULL);
140#endif
141}
142
143char *
144strerror(int num)
145{
146	static char ebuf[NL_TEXTMAX];
147
148	if (strerror_rl(num, ebuf, sizeof(ebuf), __get_locale()) != 0)
149		errno = EINVAL;
150	return (ebuf);
151}
152