xref: /illumos-gate/usr/src/lib/libc/port/locale/setlocale.c (revision bc09504ff1ed70f84c9713b732281f14a9ef49b2)
1 /*
2  * Copyright 2014 Garrett D'Amore <garrett@damore.org>
3  * Copyright 2010 Nexenta Systems, Inc.  All rights reserved.
4  * Copyright (c) 1996 - 2002 FreeBSD Project
5  * Copyright (c) 1991, 1993
6  *	The Regents of the University of California.  All rights reserved.
7  *
8  * This code is derived from software contributed to Berkeley by
9  * Paul Borman at Krystal Technologies.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  *    notice, this list of conditions and the following disclaimer in the
18  *    documentation and/or other materials provided with the distribution.
19  * 4. Neither the name of the University nor the names of its contributors
20  *    may be used to endorse or promote products derived from this software
21  *    without specific prior written permission.
22  *
23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33  * SUCH DAMAGE.
34  */
35 
36 #include "lint.h"
37 #include <sys/types.h>
38 #include <sys/stat.h>
39 #include <errno.h>
40 #include <limits.h>
41 #include <locale.h>
42 #include <stdlib.h>
43 #include <string.h>
44 #include <unistd.h>
45 #include <stdio.h>
46 #include "mtlib.h"
47 #include "collate.h"
48 #include "lnumeric.h"	/* for struct lc_numeric */
49 #include "lctype.h"	/* for struct lc_ctype */
50 #include "runetype.h"
51 #include "setlocale.h"
52 #include "../i18n/_loc_path.h"
53 #include "localeimpl.h"
54 #include "../i18n/_locale.h"
55 #include "libc.h"
56 
57 /*
58  * Path to locale storage directory.  See ../i18n/_loc_path.h
59  */
60 char	*_PathLocale = _DFLT_LOC_PATH;
61 
62 static void	install_legacy(locale_t, int);
63 
64 static mutex_t setlocale_lock = DEFAULTMUTEX;
65 static locale_t setlocale_list = NULL;
66 
67 char *
setlocale(int category,const char * locname)68 setlocale(int category, const char *locname)
69 {
70 	locale_t loc;
71 	locale_t srch;
72 	int mask;
73 
74 	if (category < 0 || category > LC_ALL) {
75 		errno = EINVAL;
76 		return (NULL);
77 	}
78 
79 	if (locname == NULL)
80 		return (current_locale(___global_locale, category));
81 
82 	mask = (category == LC_ALL ? LC_ALL_MASK : (1 << category));
83 
84 	loc = newlocale(mask, locname, NULL);
85 	if (loc == NULL) {
86 		return (NULL);
87 	}
88 
89 	/*
90 	 * This next logic looks to see if we have ever used the same locale
91 	 * settings before.  If so, we reuse it.  We avoid ever calling
92 	 * freelocale() on a locale setting built up by setlocale, this
93 	 * ensures that consumers (uselocale) will always be thread safe;
94 	 * the actual locale data objects are never freed, and unique
95 	 * locale objects are also never freed.  We reuse to avoid leaking
96 	 * memory in applications that call setlocale repeatedly.
97 	 */
98 	lmutex_lock(&setlocale_lock);
99 	for (srch = setlocale_list; srch != NULL; srch = srch->next) {
100 		if (strcmp(srch->locname, loc->locname) == 0) {
101 			break;
102 		}
103 	}
104 
105 	if (srch == NULL) {
106 		/* this is a new locale, save it for reuse later */
107 		loc->next = setlocale_list;
108 		loc->on_list = 1;
109 		setlocale_list = loc;
110 	} else {
111 		/* we already had it, toss the new, and use what we found */
112 		freelocale(loc);
113 		loc = srch;
114 	}
115 	___global_locale = loc;
116 
117 	install_legacy(loc, mask);
118 	lmutex_unlock(&setlocale_lock);
119 
120 	return (current_locale(loc, category));
121 }
122 
123 char *
current_locale(locale_t loc,int cat)124 current_locale(locale_t loc, int cat)
125 {
126 	switch (cat) {
127 	case LC_CTYPE:
128 	case LC_COLLATE:
129 	case LC_MESSAGES:
130 	case LC_MONETARY:
131 	case LC_NUMERIC:
132 	case LC_TIME:
133 		return (loc->locdata[cat]->l_lname);
134 	case LC_ALL:
135 		return (loc->locname);
136 	default:
137 		return (NULL);
138 	}
139 }
140 
141 static void
install_legacy(locale_t loc,int mask)142 install_legacy(locale_t loc, int mask)
143 {
144 	/*
145 	 * Update the legacy fixed variables that may be baked into
146 	 * legacy programs.  This is really unfortunate, but we can't
147 	 * solve for them otherwise.  Note that such legacy programs
148 	 * are only going to see the global locale settings, and cannot
149 	 * benefit from uselocale().
150 	 */
151 	if (mask & LC_NUMERIC_MASK) {
152 		struct lc_numeric *lnum;
153 		lnum = loc->locdata[LC_NUMERIC]->l_data[0];
154 		_numeric[0] = *lnum->decimal_point;
155 		_numeric[1] = *lnum->thousands_sep;
156 	}
157 
158 	if (mask & LC_CTYPE_MASK) {
159 		struct lc_ctype *lct;
160 		lct = loc->locdata[LC_CTYPE]->l_data[0];
161 		for (int i = 0; i < _CACHED_RUNES; i++) {
162 			/* ctype can only encode the lower 8 bits. */
163 			__ctype[i+1] = lct->lc_ctype_mask[i] & 0xff;
164 			__ctype_mask[i] = lct->lc_ctype_mask[i];
165 		}
166 
167 		/* The bottom half is the toupper/lower array */
168 		for (int i = 0; i < _CACHED_RUNES; i++) {
169 			int u, l;
170 			__ctype[258 + i] = i;
171 			u = lct->lc_trans_upper[i];
172 			l = lct->lc_trans_lower[i];
173 			if (u && u != i)
174 				__ctype[258+i] = u;
175 			if (l && l != i)
176 				__ctype[258+i] = l;
177 
178 			/* Don't forget these annoyances either! */
179 			__trans_upper[i] = u;
180 			__trans_lower[i] = l;
181 		}
182 
183 		/* Maximum mblen, cswidth, weird legacy */
184 		__ctype[520] = lct->lc_max_mblen;
185 	}
186 }
187