xref: /freebsd/lib/libc/locale/setrunelocale.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
1 /*-
2  * Copyright (c) 1993
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * This code is derived from software contributed to Berkeley by
6  * Paul Borman at Krystal Technologies.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 4. Neither the name of the University nor the names of its contributors
17  *    may be used to endorse or promote products derived from this software
18  *    without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  */
32 
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
35 
36 #include <runetype.h>
37 #include <errno.h>
38 #include <limits.h>
39 #include <string.h>
40 #include <stdio.h>
41 #include <stdlib.h>
42 #include <unistd.h>
43 #include <wchar.h>
44 #include "ldpart.h"
45 #include "mblocal.h"
46 #include "setlocale.h"
47 
48 extern int __mb_sb_limit;
49 
50 extern _RuneLocale	*_Read_RuneMagi(FILE *);
51 
52 static int		__setrunelocale(const char *);
53 
54 static int
55 __setrunelocale(const char *encoding)
56 {
57 	FILE *fp;
58 	char name[PATH_MAX];
59 	_RuneLocale *rl;
60 	int saverr, ret;
61 	static char ctype_encoding[ENCODING_LEN + 1];
62 	static _RuneLocale *CachedRuneLocale;
63 	static int Cached__mb_cur_max;
64 	static int Cached__mb_sb_limit;
65 	static size_t (*Cached__mbrtowc)(wchar_t * __restrict,
66 	    const char * __restrict, size_t, mbstate_t * __restrict);
67 	static size_t (*Cached__wcrtomb)(char * __restrict, wchar_t,
68 	    mbstate_t * __restrict);
69 	static int (*Cached__mbsinit)(const mbstate_t *);
70 	static size_t (*Cached__mbsnrtowcs)(wchar_t * __restrict,
71 	    const char ** __restrict, size_t, size_t, mbstate_t * __restrict);
72 	static size_t (*Cached__wcsnrtombs)(char * __restrict,
73 	    const wchar_t ** __restrict, size_t, size_t,
74 	    mbstate_t * __restrict);
75 
76 	/*
77 	 * The "C" and "POSIX" locale are always here.
78 	 */
79 	if (strcmp(encoding, "C") == 0 || strcmp(encoding, "POSIX") == 0) {
80 		_none_init(&_DefaultRuneLocale);
81 		return (0);
82 	}
83 
84 	/*
85 	 * If the locale name is the same as our cache, use the cache.
86 	 */
87 	if (CachedRuneLocale != NULL &&
88 	    strcmp(encoding, ctype_encoding) == 0) {
89 		_CurrentRuneLocale = CachedRuneLocale;
90 		__mb_cur_max = Cached__mb_cur_max;
91 		__mb_sb_limit = Cached__mb_sb_limit;
92 		__mbrtowc = Cached__mbrtowc;
93 		__mbsinit = Cached__mbsinit;
94 		__mbsnrtowcs = Cached__mbsnrtowcs;
95 		__wcrtomb = Cached__wcrtomb;
96 		__wcsnrtombs = Cached__wcsnrtombs;
97 		return (0);
98 	}
99 
100 	/*
101 	 * Slurp the locale file into the cache.
102 	 */
103 
104 	/* Range checking not needed, encoding length already checked before */
105 	(void) strcpy(name, _PathLocale);
106 	(void) strcat(name, "/");
107 	(void) strcat(name, encoding);
108 	(void) strcat(name, "/LC_CTYPE");
109 
110 	if ((fp = fopen(name, "r")) == NULL)
111 		return (errno == 0 ? ENOENT : errno);
112 
113 	if ((rl = _Read_RuneMagi(fp)) == NULL) {
114 		saverr = (errno == 0 ? EFTYPE : errno);
115 		(void)fclose(fp);
116 		return (saverr);
117 	}
118 	(void)fclose(fp);
119 
120 	__mbrtowc = NULL;
121 	__mbsinit = NULL;
122 	__mbsnrtowcs = __mbsnrtowcs_std;
123 	__wcrtomb = NULL;
124 	__wcsnrtombs = __wcsnrtombs_std;
125 	rl->__sputrune = NULL;
126 	rl->__sgetrune = NULL;
127 	if (strcmp(rl->__encoding, "NONE") == 0)
128 		ret = _none_init(rl);
129 	else if (strcmp(rl->__encoding, "UTF-8") == 0)
130 		ret = _UTF8_init(rl);
131 	else if (strcmp(rl->__encoding, "EUC") == 0)
132 		ret = _EUC_init(rl);
133  	else if (strcmp(rl->__encoding, "GB18030") == 0)
134  		ret = _GB18030_init(rl);
135 	else if (strcmp(rl->__encoding, "GB2312") == 0)
136 		ret = _GB2312_init(rl);
137 	else if (strcmp(rl->__encoding, "GBK") == 0)
138 		ret = _GBK_init(rl);
139 	else if (strcmp(rl->__encoding, "BIG5") == 0)
140 		ret = _BIG5_init(rl);
141 	else if (strcmp(rl->__encoding, "MSKanji") == 0)
142 		ret = _MSKanji_init(rl);
143 	else
144 		ret = EFTYPE;
145 	if (ret == 0) {
146 		if (CachedRuneLocale != NULL) {
147 			/* See euc.c */
148 			if (strcmp(CachedRuneLocale->__encoding, "EUC") == 0)
149 				free(CachedRuneLocale->__variable);
150 			free(CachedRuneLocale);
151 		}
152 		CachedRuneLocale = _CurrentRuneLocale;
153 		Cached__mb_cur_max = __mb_cur_max;
154 		Cached__mb_sb_limit = __mb_sb_limit;
155 		Cached__mbrtowc = __mbrtowc;
156 		Cached__mbsinit = __mbsinit;
157 		Cached__mbsnrtowcs = __mbsnrtowcs;
158 		Cached__wcrtomb = __wcrtomb;
159 		Cached__wcsnrtombs = __wcsnrtombs;
160 		(void)strcpy(ctype_encoding, encoding);
161 	} else
162 		free(rl);
163 
164 	return (ret);
165 }
166 
167 int
168 __wrap_setrunelocale(const char *locale)
169 {
170 	int ret = __setrunelocale(locale);
171 
172 	if (ret != 0) {
173 		errno = ret;
174 		return (_LDP_ERROR);
175 	}
176 	return (_LDP_LOADED);
177 }
178 
179