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 #if defined(NLS)
36 #include <nl_types.h>
37 #endif
38
39 #include <limits.h>
40 #include <errno.h>
41 #include <string.h>
42 #include <stdio.h>
43
44 #include "errlst.h"
45 #include "../locale/xlocale_private.h"
46 #include "libc_private.h"
47
48 /*
49 * Define buffer big enough to contain delimiter (": ", 2 bytes),
50 * 64-bit signed integer converted to ASCII decimal (19 bytes) with
51 * optional leading sign (1 byte), and a trailing NUL.
52 */
53 #define EBUFSIZE (2 + 19 + 1 + 1)
54
55 /*
56 * Doing this by hand instead of linking with stdio(3) avoids bloat for
57 * statically linked binaries.
58 */
59 static void
errstr(int num,const char * uprefix,char * buf,size_t len)60 errstr(int num, const 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
80 int
__strerror_rl(int errnum,char * strerrbuf,size_t buflen,locale_t locale)81 __strerror_rl(int errnum, char *strerrbuf, size_t buflen, locale_t locale)
82 {
83 int retval = 0;
84 #if defined(NLS)
85 int saved_errno = errno;
86 nl_catd catd;
87
88 catd = __catopen_l("libc", NL_CAT_LOCALE, locale);
89 #endif
90
91 if (errnum < 0 || errnum >= __hidden_sys_nerr) {
92 errstr(errnum,
93 #if defined(NLS)
94 catgets(catd, 1, 0xffff, __uprefix),
95 #else
96 __uprefix,
97 #endif
98 strerrbuf, buflen);
99 retval = EINVAL;
100 } else {
101 if (strlcpy(strerrbuf,
102 #if defined(NLS)
103 catgets(catd, 1, errnum, __hidden_sys_errlist[errnum]),
104 #else
105 __hidden_sys_errlist[errnum],
106 #endif
107 buflen) >= buflen)
108 retval = ERANGE;
109 }
110
111 #if defined(NLS)
112 catclose(catd);
113 errno = saved_errno;
114 #endif
115
116 return (retval);
117 }
118
119 int
strerror_r(int errnum,char * strerrbuf,size_t buflen)120 strerror_r(int errnum, char *strerrbuf, size_t buflen)
121 {
122 return (__strerror_rl(errnum, strerrbuf, buflen, __get_locale()));
123 }
124
125 char *
strerror_l(int num,locale_t locale)126 strerror_l(int num, locale_t locale)
127 {
128 static _Thread_local char ebuf[NL_TEXTMAX];
129
130 if (__strerror_rl(num, ebuf, sizeof(ebuf), locale) != 0)
131 errno = EINVAL;
132 return (ebuf);
133 }
134
135 char *
strerror(int num)136 strerror(int num)
137 {
138 static char ebuf[NL_TEXTMAX];
139
140 if (__strerror_rl(num, ebuf, sizeof(ebuf), __get_locale()) != 0)
141 errno = EINVAL;
142 return (ebuf);
143 }
144