1 /*
2 * Copyright (C) 2008 The Android Open Source Project
3 * 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 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <locale.h>
30 #include <pthread.h>
31 #include <stdlib.h>
32
33 #include "private/bionic_macros.h"
34
35 // We currently support a single locale, the "C" locale (also known as "POSIX").
36
37 static bool __bionic_current_locale_is_utf8 = true;
38
39 struct __locale_t {
40 size_t mb_cur_max;
41
__locale_t__locale_t42 __locale_t(size_t mb_cur_max) : mb_cur_max(mb_cur_max) {
43 }
44
__locale_t__locale_t45 __locale_t(const __locale_t* other) {
46 if (other == LC_GLOBAL_LOCALE) {
47 mb_cur_max = __bionic_current_locale_is_utf8 ? 4 : 1;
48 } else {
49 mb_cur_max = other->mb_cur_max;
50 }
51 }
52
53 DISALLOW_COPY_AND_ASSIGN(__locale_t);
54 };
55
56 static pthread_once_t g_locale_once = PTHREAD_ONCE_INIT;
57 static lconv g_locale;
58
59 // We don't use pthread_once for this so that we know when the resource (a TLS slot) will be taken.
60 static pthread_key_t g_uselocale_key;
__bionic_tls_uselocale_key_init()61 __attribute__((constructor)) static void __bionic_tls_uselocale_key_init() {
62 pthread_key_create(&g_uselocale_key, NULL);
63 }
64
__locale_init()65 static void __locale_init() {
66 g_locale.decimal_point = const_cast<char*>(".");
67
68 char* not_available = const_cast<char*>("");
69 g_locale.thousands_sep = not_available;
70 g_locale.grouping = not_available;
71 g_locale.int_curr_symbol = not_available;
72 g_locale.currency_symbol = not_available;
73 g_locale.mon_decimal_point = not_available;
74 g_locale.mon_thousands_sep = not_available;
75 g_locale.mon_grouping = not_available;
76 g_locale.positive_sign = not_available;
77 g_locale.negative_sign = not_available;
78
79 g_locale.int_frac_digits = CHAR_MAX;
80 g_locale.frac_digits = CHAR_MAX;
81 g_locale.p_cs_precedes = CHAR_MAX;
82 g_locale.p_sep_by_space = CHAR_MAX;
83 g_locale.n_cs_precedes = CHAR_MAX;
84 g_locale.n_sep_by_space = CHAR_MAX;
85 g_locale.p_sign_posn = CHAR_MAX;
86 g_locale.n_sign_posn = CHAR_MAX;
87 g_locale.int_p_cs_precedes = CHAR_MAX;
88 g_locale.int_p_sep_by_space = CHAR_MAX;
89 g_locale.int_n_cs_precedes = CHAR_MAX;
90 g_locale.int_n_sep_by_space = CHAR_MAX;
91 g_locale.int_p_sign_posn = CHAR_MAX;
92 g_locale.int_n_sign_posn = CHAR_MAX;
93 }
94
__ctype_get_mb_cur_max()95 size_t __ctype_get_mb_cur_max() {
96 locale_t l = reinterpret_cast<locale_t>(pthread_getspecific(g_uselocale_key));
97 if (l == nullptr || l == LC_GLOBAL_LOCALE) {
98 return __bionic_current_locale_is_utf8 ? 4 : 1;
99 } else {
100 return l->mb_cur_max;
101 }
102 }
103
__is_supported_locale(const char * locale)104 static bool __is_supported_locale(const char* locale) {
105 return (strcmp(locale, "") == 0 ||
106 strcmp(locale, "C") == 0 ||
107 strcmp(locale, "C.UTF-8") == 0 ||
108 strcmp(locale, "en_US.UTF-8") == 0 ||
109 strcmp(locale, "POSIX") == 0);
110 }
111
localeconv()112 lconv* localeconv() {
113 pthread_once(&g_locale_once, __locale_init);
114 return &g_locale;
115 }
116
duplocale(locale_t l)117 locale_t duplocale(locale_t l) {
118 return new __locale_t(l);
119 }
120
freelocale(locale_t l)121 void freelocale(locale_t l) {
122 delete l;
123 }
124
newlocale(int category_mask,const char * locale_name,locale_t)125 locale_t newlocale(int category_mask, const char* locale_name, locale_t /*base*/) {
126 // Is 'category_mask' valid?
127 if ((category_mask & ~LC_ALL_MASK) != 0) {
128 errno = EINVAL;
129 return NULL;
130 }
131
132 if (!__is_supported_locale(locale_name)) {
133 errno = ENOENT;
134 return NULL;
135 }
136
137 return new __locale_t(strstr(locale_name, "UTF-8") != NULL ? 4 : 1);
138 }
139
setlocale(int category,const char * locale_name)140 char* setlocale(int category, const char* locale_name) {
141 // Is 'category' valid?
142 if (category < LC_CTYPE || category > LC_IDENTIFICATION) {
143 errno = EINVAL;
144 return NULL;
145 }
146
147 // Caller wants to set the locale rather than just query?
148 if (locale_name != NULL) {
149 if (!__is_supported_locale(locale_name)) {
150 // We don't support this locale.
151 errno = ENOENT;
152 return NULL;
153 }
154 __bionic_current_locale_is_utf8 = (strstr(locale_name, "UTF-8") != NULL);
155 }
156
157 return const_cast<char*>(__bionic_current_locale_is_utf8 ? "C.UTF-8" : "C");
158 }
159
uselocale(locale_t new_locale)160 locale_t uselocale(locale_t new_locale) {
161 locale_t old_locale = static_cast<locale_t>(pthread_getspecific(g_uselocale_key));
162
163 // If this is the first call to uselocale(3) on this thread, we return LC_GLOBAL_LOCALE.
164 if (old_locale == NULL) {
165 old_locale = LC_GLOBAL_LOCALE;
166 }
167
168 if (new_locale != NULL) {
169 pthread_setspecific(g_uselocale_key, new_locale);
170 }
171
172 return old_locale;
173 }
174