xref: /freebsd/lib/libc/locale/setrunelocale.c (revision 8d20be1e22095c27faf8fe8b2f0d089739cc742e)
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  * Copyright (c) 2011 The FreeBSD Foundation
9  * All rights reserved.
10  * Portions of this software were developed by David Chisnall
11  * under sponsorship from the FreeBSD Foundation.
12  *
13  * Redistribution and use in source and binary forms, with or without
14  * modification, are permitted provided that the following conditions
15  * are met:
16  * 1. Redistributions of source code must retain the above copyright
17  *    notice, this list of conditions and the following disclaimer.
18  * 2. Redistributions in binary form must reproduce the above copyright
19  *    notice, this list of conditions and the following disclaimer in the
20  *    documentation and/or other materials provided with the distribution.
21  * 4. Neither the name of the University nor the names of its contributors
22  *    may be used to endorse or promote products derived from this software
23  *    without specific prior written permission.
24  *
25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35  * SUCH DAMAGE.
36  */
37 
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
40 
41 #define __RUNETYPE_INTERNAL 1
42 
43 #include <runetype.h>
44 #include <errno.h>
45 #include <limits.h>
46 #include <string.h>
47 #include <stdio.h>
48 #include <stdlib.h>
49 #include <unistd.h>
50 #include <wchar.h>
51 #include "ldpart.h"
52 #include "mblocal.h"
53 #include "setlocale.h"
54 
55 #undef _CurrentRuneLocale
56 extern _RuneLocale const *_CurrentRuneLocale;
57 #ifndef __NO_TLS
58 /*
59  * A cached version of the runes for this thread.  Used by ctype.h
60  */
61 _Thread_local const _RuneLocale *_ThreadRuneLocale;
62 #endif
63 
64 extern int __mb_sb_limit;
65 
66 extern _RuneLocale	*_Read_RuneMagi(FILE *);
67 
68 static int		__setrunelocale(struct xlocale_ctype *l, const char *);
69 
70 #define __collate_substitute_nontrivial (table->__collate_substitute_nontrivial)
71 #define __collate_substitute_table_ptr (table->__collate_substitute_table_ptr)
72 #define __collate_char_pri_table_ptr (table->__collate_char_pri_table_ptr)
73 #define __collate_chain_pri_table (table->__collate_chain_pri_table)
74 
75 
76 static void
77 destruct_ctype(void *v)
78 {
79 	struct xlocale_ctype *l = v;
80 
81 	if (strcmp(l->runes->__encoding, "EUC") == 0)
82 		free(l->runes->__variable);
83 	if (&_DefaultRuneLocale != l->runes)
84 		free(l->runes);
85 	free(l);
86 }
87 
88 const _RuneLocale *
89 __getCurrentRuneLocale(void)
90 {
91 
92 	return XLOCALE_CTYPE(__get_locale())->runes;
93 }
94 
95 static void
96 free_runes(_RuneLocale *rl)
97 {
98 
99 	/* FIXME: The "EUC" check here is a hideous abstraction violation. */
100 	if ((rl != &_DefaultRuneLocale) && (rl)) {
101 		if (strcmp(rl->__encoding, "EUC") == 0) {
102 			free(rl->__variable);
103 		}
104 		free(rl);
105 	}
106 }
107 
108 static int
109 __setrunelocale(struct xlocale_ctype *l, const char *encoding)
110 {
111 	FILE *fp;
112 	char name[PATH_MAX];
113 	_RuneLocale *rl;
114 	int saverr, ret;
115 	struct xlocale_ctype saved = *l;
116 
117 	/*
118 	 * The "C" and "POSIX" locale are always here.
119 	 */
120 	if (strcmp(encoding, "C") == 0 || strcmp(encoding, "POSIX") == 0) {
121 		free_runes(saved.runes);
122 		(void) _none_init(l, (_RuneLocale*)&_DefaultRuneLocale);
123 		return (0);
124 	}
125 
126 	/* Range checking not needed, encoding length already checked before */
127 	(void) strcpy(name, _PathLocale);
128 	(void) strcat(name, "/");
129 	(void) strcat(name, encoding);
130 	(void) strcat(name, "/LC_CTYPE");
131 
132 	if ((fp = fopen(name, "re")) == NULL)
133 		return (errno == 0 ? ENOENT : errno);
134 
135 	if ((rl = _Read_RuneMagi(fp)) == NULL) {
136 		saverr = (errno == 0 ? EFTYPE : errno);
137 		(void)fclose(fp);
138 		return (saverr);
139 	}
140 	(void)fclose(fp);
141 
142 	l->__mbrtowc = NULL;
143 	l->__mbsinit = NULL;
144 	l->__mbsnrtowcs = __mbsnrtowcs_std;
145 	l->__wcrtomb = NULL;
146 	l->__wcsnrtombs = __wcsnrtombs_std;
147 
148 	rl->__sputrune = NULL;
149 	rl->__sgetrune = NULL;
150 	if (strcmp(rl->__encoding, "NONE") == 0)
151 		ret = _none_init(l, rl);
152 	else if (strcmp(rl->__encoding, "ASCII") == 0)
153 		ret = _ascii_init(l, rl);
154 	else if (strcmp(rl->__encoding, "UTF-8") == 0)
155 		ret = _UTF8_init(l, rl);
156 	else if (strcmp(rl->__encoding, "EUC") == 0)
157 		ret = _EUC_init(l, rl);
158 	else if (strcmp(rl->__encoding, "GB18030") == 0)
159  		ret = _GB18030_init(l, rl);
160 	else if (strcmp(rl->__encoding, "GB2312") == 0)
161 		ret = _GB2312_init(l, rl);
162 	else if (strcmp(rl->__encoding, "GBK") == 0)
163 		ret = _GBK_init(l, rl);
164 	else if (strcmp(rl->__encoding, "BIG5") == 0)
165 		ret = _BIG5_init(l, rl);
166 	else if (strcmp(rl->__encoding, "MSKanji") == 0)
167 		ret = _MSKanji_init(l, rl);
168 	else
169 		ret = EFTYPE;
170 
171 	if (ret == 0) {
172 		/* Free the old runes if it exists. */
173 		free_runes(saved.runes);
174 	} else {
175 		/* Restore the saved version if this failed. */
176 		memcpy(l, &saved, sizeof(struct xlocale_ctype));
177 		free(rl);
178 	}
179 
180 	return (ret);
181 }
182 
183 int
184 __wrap_setrunelocale(const char *locale)
185 {
186 	int ret = __setrunelocale(&__xlocale_global_ctype, locale);
187 
188 	if (ret != 0) {
189 		errno = ret;
190 		return (_LDP_ERROR);
191 	}
192 	__mb_cur_max = __xlocale_global_ctype.__mb_cur_max;
193 	__mb_sb_limit = __xlocale_global_ctype.__mb_sb_limit;
194 	_CurrentRuneLocale = __xlocale_global_ctype.runes;
195 	return (_LDP_LOADED);
196 }
197 
198 #ifndef __NO_TLS
199 void
200 __set_thread_rune_locale(locale_t loc)
201 {
202 
203 	if (loc == NULL) {
204 		_ThreadRuneLocale = &_DefaultRuneLocale;
205 	} else {
206 		_ThreadRuneLocale = XLOCALE_CTYPE(loc)->runes;
207 	}
208 }
209 #endif
210 
211 void *
212 __ctype_load(const char *locale, locale_t unused)
213 {
214 	struct xlocale_ctype *l = calloc(sizeof(struct xlocale_ctype), 1);
215 
216 	l->header.header.destructor = destruct_ctype;
217 	if (__setrunelocale(l, locale))
218 	{
219 		free(l);
220 		return NULL;
221 	}
222 	return l;
223 }
224