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 <errno.h> 30 #include <locale.h> 31 #include <pthread.h> 32 #include <stdlib.h> 33 #include <string.h> 34 #include <strings.h> 35 #include <time.h> 36 #include <wchar.h> 37 38 #include "private/bionic_macros.h" 39 40 #if defined(__BIONIC_BUILD_FOR_ANDROID_SUPPORT) 41 #define USE_TLS_SLOT 0 42 #else 43 #define USE_TLS_SLOT 1 44 #endif 45 46 #if USE_TLS_SLOT 47 #include "bionic/pthread_internal.h" 48 #endif 49 50 // We only support two locales, the "C" locale (also known as "POSIX"), 51 // and the "C.UTF-8" locale (also known as "en_US.UTF-8"). 52 53 static bool __bionic_current_locale_is_utf8 = true; 54 55 struct __locale_t { 56 size_t mb_cur_max; 57 58 explicit __locale_t(size_t mb_cur_max) : mb_cur_max(mb_cur_max) { 59 } 60 61 explicit __locale_t(const __locale_t* other) { 62 if (other == LC_GLOBAL_LOCALE) { 63 mb_cur_max = __bionic_current_locale_is_utf8 ? 4 : 1; 64 } else { 65 mb_cur_max = other->mb_cur_max; 66 } 67 } 68 69 DISALLOW_COPY_AND_ASSIGN(__locale_t); 70 }; 71 72 size_t __ctype_get_mb_cur_max() { 73 locale_t l = uselocale(NULL); 74 if (l == LC_GLOBAL_LOCALE) { 75 return __bionic_current_locale_is_utf8 ? 4 : 1; 76 } else { 77 return l->mb_cur_max; 78 } 79 } 80 81 #if !USE_TLS_SLOT 82 static thread_local locale_t g_current_locale; 83 #endif 84 85 static pthread_once_t g_locale_once = PTHREAD_ONCE_INIT; 86 static lconv g_locale; 87 88 static void __locale_init() { 89 g_locale.decimal_point = const_cast<char*>("."); 90 91 char* not_available = const_cast<char*>(""); 92 g_locale.thousands_sep = not_available; 93 g_locale.grouping = not_available; 94 g_locale.int_curr_symbol = not_available; 95 g_locale.currency_symbol = not_available; 96 g_locale.mon_decimal_point = not_available; 97 g_locale.mon_thousands_sep = not_available; 98 g_locale.mon_grouping = not_available; 99 g_locale.positive_sign = not_available; 100 g_locale.negative_sign = not_available; 101 102 g_locale.int_frac_digits = CHAR_MAX; 103 g_locale.frac_digits = CHAR_MAX; 104 g_locale.p_cs_precedes = CHAR_MAX; 105 g_locale.p_sep_by_space = CHAR_MAX; 106 g_locale.n_cs_precedes = CHAR_MAX; 107 g_locale.n_sep_by_space = CHAR_MAX; 108 g_locale.p_sign_posn = CHAR_MAX; 109 g_locale.n_sign_posn = CHAR_MAX; 110 g_locale.int_p_cs_precedes = CHAR_MAX; 111 g_locale.int_p_sep_by_space = CHAR_MAX; 112 g_locale.int_n_cs_precedes = CHAR_MAX; 113 g_locale.int_n_sep_by_space = CHAR_MAX; 114 g_locale.int_p_sign_posn = CHAR_MAX; 115 g_locale.int_n_sign_posn = CHAR_MAX; 116 } 117 118 static bool __is_supported_locale(const char* locale_name) { 119 return (strcmp(locale_name, "") == 0 || 120 strcmp(locale_name, "C") == 0 || 121 strcmp(locale_name, "C.UTF-8") == 0 || 122 strcmp(locale_name, "en_US.UTF-8") == 0 || 123 strcmp(locale_name, "POSIX") == 0); 124 } 125 126 static bool __is_utf8_locale(const char* locale_name) { 127 return (*locale_name == '\0' || strstr(locale_name, "UTF-8")); 128 } 129 130 lconv* localeconv() { 131 pthread_once(&g_locale_once, __locale_init); 132 return &g_locale; 133 } 134 135 locale_t duplocale(locale_t l) { 136 return new __locale_t(l); 137 } 138 139 void freelocale(locale_t l) { 140 delete l; 141 } 142 143 locale_t newlocale(int category_mask, const char* locale_name, locale_t /*base*/) { 144 // Are 'category_mask' and 'locale_name' valid? 145 if ((category_mask & ~LC_ALL_MASK) != 0 || locale_name == NULL) { 146 errno = EINVAL; 147 return NULL; 148 } 149 150 if (!__is_supported_locale(locale_name)) { 151 errno = ENOENT; 152 return NULL; 153 } 154 155 return new __locale_t(__is_utf8_locale(locale_name) ? 4 : 1); 156 } 157 158 char* setlocale(int category, const char* locale_name) { 159 // Is 'category' valid? 160 if (category < LC_CTYPE || category > LC_IDENTIFICATION) { 161 errno = EINVAL; 162 return NULL; 163 } 164 165 // Caller wants to set the locale rather than just query? 166 if (locale_name != NULL) { 167 if (!__is_supported_locale(locale_name)) { 168 // We don't support this locale. 169 errno = ENOENT; 170 return NULL; 171 } 172 __bionic_current_locale_is_utf8 = __is_utf8_locale(locale_name); 173 } 174 175 return const_cast<char*>(__bionic_current_locale_is_utf8 ? "C.UTF-8" : "C"); 176 } 177 178 static locale_t* get_current_locale_ptr() { 179 #if USE_TLS_SLOT 180 return &__get_bionic_tls().locale; 181 #else 182 return &g_current_locale; 183 #endif 184 } 185 186 locale_t uselocale(locale_t new_locale) { 187 locale_t old_locale = *get_current_locale_ptr(); 188 189 // If this is the first call to uselocale(3) on this thread, we return LC_GLOBAL_LOCALE. 190 if (old_locale == NULL) { 191 old_locale = LC_GLOBAL_LOCALE; 192 } 193 194 if (new_locale != NULL) { 195 *get_current_locale_ptr() = new_locale; 196 } 197 198 return old_locale; 199 } 200
