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)
33 static 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 */
62 static void
errstr(int num,const char * uprefix,char * buf,size_t len)63 errstr(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
83 static int
strerror_rl(int errnum,char * strerrbuf,size_t buflen,locale_t locale)84 strerror_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
122 int
strerror_r(int errnum,char * strerrbuf,size_t buflen)123 strerror_r(int errnum, char *strerrbuf, size_t buflen)
124 {
125 return (strerror_rl(errnum, strerrbuf, buflen, __get_locale()));
126 }
127
128 char *
strerror_l(int num,locale_t locale)129 strerror_l(int num, locale_t locale)
130 {
131 static _Thread_local char ebuf[NL_TEXTMAX];
132
133 if (strerror_rl(num, ebuf, sizeof(ebuf), locale) != 0)
134 errno = EINVAL;
135 return (ebuf);
136 }
137
138 char *
strerror(int num)139 strerror(int num)
140 {
141 static char ebuf[NL_TEXTMAX];
142
143 if (strerror_rl(num, ebuf, sizeof(ebuf), __get_locale()) != 0)
144 errno = EINVAL;
145 return (ebuf);
146 }
147