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 * 3. 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 * @(#)strerror.c 8.1 (Berkeley) 6/4/93
30 * $FreeBSD: head/lib/libc/string/strerror.c 255108 2013-08-31 22:32:42Z jilles $
31 * (errlst.h removed)
32 */
33
34 #if defined(NLS)
35 #include <nl_types.h>
36 #endif
37
38 #include <limits.h>
39 #include <errno.h>
40 #include <string.h>
41 #include <stdio.h>
42
43 #include "../locale/xlocale_private.h"
44 #include "libc_private.h"
45
46 #define UPREFIX "Unknown error"
47
48 /*
49 * Define a buffer size big enough to describe a 64-bit signed integer
50 * converted to ASCII decimal (19 bytes), with an optional leading sign
51 * (1 byte); finally, we get the prefix, delimiter (": ") and a trailing
52 * NUL from UPREFIX.
53 */
54 #define EBUFSIZE (20 + 2 + sizeof(UPREFIX))
55
56 /*
57 * Doing this by hand instead of linking with stdio(3) avoids bloat for
58 * statically linked binaries.
59 */
60 static void
errstr(int num,char * uprefix,char * buf,size_t len)61 errstr(int num, char *uprefix, char *buf, size_t len)
62 {
63 char *t;
64 unsigned int uerr;
65 char tmp[EBUFSIZE];
66
67 t = tmp + sizeof(tmp);
68 *--t = '\0';
69 uerr = (num >= 0) ? num : -num;
70 do {
71 *--t = "0123456789"[uerr % 10];
72 } while (uerr /= 10);
73 if (num < 0)
74 *--t = '-';
75 *--t = ' ';
76 *--t = ':';
77 strlcpy(buf, uprefix, len);
78 strlcat(buf, t, len);
79 }
80
81 static int
strerror_rl(int errnum,char * strerrbuf,size_t buflen,locale_t locale)82 strerror_rl(int errnum, char *strerrbuf, size_t buflen, locale_t locale)
83 {
84 int retval = 0;
85 #if defined(NLS)
86 int saved_errno = errno;
87 nl_catd catd;
88
89 catd = __catopen_l("libc", NL_CAT_LOCALE, locale);
90 #endif
91
92 if (errnum < 0 || errnum >= sys_nerr) {
93 errstr(errnum,
94 #if defined(NLS)
95 catgets(catd, 1, 0xffff, UPREFIX),
96 #else
97 UPREFIX,
98 #endif
99 strerrbuf, buflen);
100 retval = EINVAL;
101 } else {
102 if (strlcpy(strerrbuf,
103 #if defined(NLS)
104 catgets(catd, 1, errnum, sys_errlist[errnum]),
105 #else
106 sys_errlist[errnum],
107 #endif
108 buflen) >= buflen)
109 retval = ERANGE;
110 }
111
112 #if defined(NLS)
113 catclose(catd);
114 errno = saved_errno;
115 #endif
116
117 return (retval);
118 }
119
120 int
strerror_r(int errnum,char * strerrbuf,size_t buflen)121 strerror_r(int errnum, char *strerrbuf, size_t buflen)
122 {
123 return (strerror_rl(errnum, strerrbuf, buflen, __get_locale()));
124 }
125
126 char *
strerror_l(int num,locale_t locale)127 strerror_l(int num, locale_t locale)
128 {
129 static _Thread_local char ebuf[NL_TEXTMAX];
130
131 if (strerror_rl(num, ebuf, sizeof(ebuf), locale) != 0)
132 errno = EINVAL;
133 return (ebuf);
134 }
135
136 char *
strerror(int num)137 strerror(int num)
138 {
139 static char ebuf[NL_TEXTMAX];
140
141 if (strerror_rl(num, ebuf, sizeof(ebuf), __get_locale()) != 0)
142 errno = EINVAL;
143 return (ebuf);
144 }
145