1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2011 The FreeBSD Foundation 5 * All rights reserved. 6 * 7 * This software was developed by David Chisnall under sponsorship from 8 * the FreeBSD Foundation. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $FreeBSD$ 32 */ 33 34 #include <pthread.h> 35 #include <stdio.h> 36 #include <string.h> 37 #include <runetype.h> 38 #include "libc_private.h" 39 #include "xlocale_private.h" 40 41 /** 42 * Each locale loader declares a global component. This is used by setlocale() 43 * and also by xlocale with LC_GLOBAL_LOCALE.. 44 */ 45 extern struct xlocale_component __xlocale_global_collate; 46 extern struct xlocale_component __xlocale_global_ctype; 47 extern struct xlocale_component __xlocale_global_monetary; 48 extern struct xlocale_component __xlocale_global_numeric; 49 extern struct xlocale_component __xlocale_global_time; 50 extern struct xlocale_component __xlocale_global_messages; 51 /* 52 * And another version for the statically-allocated C locale. We only have 53 * components for the parts that are expected to be sensible. 54 */ 55 extern struct xlocale_component __xlocale_C_collate; 56 extern struct xlocale_component __xlocale_C_ctype; 57 58 #ifndef __NO_TLS 59 /* 60 * The locale for this thread. 61 */ 62 _Thread_local locale_t __thread_locale; 63 #endif 64 /* 65 * Flag indicating that one or more per-thread locales exist. 66 */ 67 int __has_thread_locale; 68 /* 69 * Private functions in setlocale.c. 70 */ 71 const char * 72 __get_locale_env(int category); 73 int 74 __detect_path_locale(void); 75 76 struct _xlocale __xlocale_global_locale = { 77 {0}, 78 { 79 &__xlocale_global_collate, 80 &__xlocale_global_ctype, 81 &__xlocale_global_monetary, 82 &__xlocale_global_numeric, 83 &__xlocale_global_time, 84 &__xlocale_global_messages 85 }, 86 1, 87 0, 88 1, 89 0 90 }; 91 92 struct _xlocale __xlocale_C_locale = { 93 {0}, 94 { 95 &__xlocale_C_collate, 96 &__xlocale_C_ctype, 97 0, 0, 0, 0 98 }, 99 1, 100 0, 101 1, 102 0 103 }; 104 105 static void*(*constructors[])(const char*, locale_t) = 106 { 107 __collate_load, 108 __ctype_load, 109 __monetary_load, 110 __numeric_load, 111 __time_load, 112 __messages_load 113 }; 114 115 static pthread_key_t locale_info_key; 116 static int fake_tls; 117 static locale_t thread_local_locale; 118 119 static void init_key(void) 120 { 121 122 pthread_key_create(&locale_info_key, xlocale_release); 123 pthread_setspecific(locale_info_key, (void*)42); 124 if (pthread_getspecific(locale_info_key) == (void*)42) { 125 pthread_setspecific(locale_info_key, 0); 126 } else { 127 fake_tls = 1; 128 } 129 /* At least one per-thread locale has now been set. */ 130 __has_thread_locale = 1; 131 __detect_path_locale(); 132 } 133 134 static pthread_once_t once_control = PTHREAD_ONCE_INIT; 135 136 static locale_t 137 get_thread_locale(void) 138 { 139 140 _once(&once_control, init_key); 141 142 return (fake_tls ? thread_local_locale : 143 pthread_getspecific(locale_info_key)); 144 } 145 146 #ifdef __NO_TLS 147 locale_t 148 __get_locale(void) 149 { 150 locale_t l = get_thread_locale(); 151 return (l ? l : &__xlocale_global_locale); 152 153 } 154 #endif 155 156 static void 157 set_thread_locale(locale_t loc) 158 { 159 locale_t l = (loc == LC_GLOBAL_LOCALE) ? 0 : loc; 160 161 _once(&once_control, init_key); 162 163 if (NULL != l) { 164 xlocale_retain((struct xlocale_refcounted*)l); 165 } 166 locale_t old = pthread_getspecific(locale_info_key); 167 if ((NULL != old) && (l != old)) { 168 xlocale_release((struct xlocale_refcounted*)old); 169 } 170 if (fake_tls) { 171 thread_local_locale = l; 172 } else { 173 pthread_setspecific(locale_info_key, l); 174 } 175 #ifndef __NO_TLS 176 __thread_locale = l; 177 __set_thread_rune_locale(loc); 178 #endif 179 } 180 181 /** 182 * Clean up a locale, once its reference count reaches zero. This function is 183 * called by xlocale_release(), it should not be called directly. 184 */ 185 static void 186 destruct_locale(void *l) 187 { 188 locale_t loc = l; 189 190 for (int type=0 ; type<XLC_LAST ; type++) { 191 if (loc->components[type]) { 192 xlocale_release(loc->components[type]); 193 } 194 } 195 if (loc->csym) { 196 free(loc->csym); 197 } 198 free(l); 199 } 200 201 /** 202 * Allocates a new, uninitialised, locale. 203 */ 204 static locale_t 205 alloc_locale(void) 206 { 207 locale_t new = calloc(sizeof(struct _xlocale), 1); 208 209 new->header.destructor = destruct_locale; 210 new->monetary_locale_changed = 1; 211 new->numeric_locale_changed = 1; 212 return (new); 213 } 214 static void 215 copyflags(locale_t new, locale_t old) 216 { 217 new->using_monetary_locale = old->using_monetary_locale; 218 new->using_numeric_locale = old->using_numeric_locale; 219 new->using_time_locale = old->using_time_locale; 220 new->using_messages_locale = old->using_messages_locale; 221 } 222 223 static int dupcomponent(int type, locale_t base, locale_t new) 224 { 225 /* Always copy from the global locale, since it has mutable components. 226 */ 227 struct xlocale_component *src = base->components[type]; 228 229 if (&__xlocale_global_locale == base) { 230 new->components[type] = constructors[type](src->locale, new); 231 if (new->components[type]) { 232 strncpy(new->components[type]->locale, src->locale, 233 ENCODING_LEN); 234 } 235 } else if (base->components[type]) { 236 new->components[type] = xlocale_retain(base->components[type]); 237 } else { 238 /* If the component was NULL, return success - if base is a 239 * valid locale then the flag indicating that this isn't 240 * present should be set. If it isn't a valid locale, then 241 * we're stuck anyway. */ 242 return 1; 243 } 244 return (0 != new->components[type]); 245 } 246 247 /* 248 * Public interfaces. These are the five public functions described by the 249 * xlocale interface. 250 */ 251 252 locale_t newlocale(int mask, const char *locale, locale_t base) 253 { 254 int type; 255 const char *realLocale = locale; 256 int useenv = 0; 257 int success = 1; 258 259 _once(&once_control, init_key); 260 261 locale_t new = alloc_locale(); 262 if (NULL == new) { 263 return (NULL); 264 } 265 266 FIX_LOCALE(base); 267 copyflags(new, base); 268 269 if (NULL == locale) { 270 realLocale = "C"; 271 } else if ('\0' == locale[0]) { 272 useenv = 1; 273 } 274 275 for (type=0 ; type<XLC_LAST ; type++) { 276 if (mask & 1) { 277 if (useenv) { 278 realLocale = __get_locale_env(type + 1); 279 } 280 new->components[type] = 281 constructors[type](realLocale, new); 282 if (new->components[type]) { 283 strncpy(new->components[type]->locale, 284 realLocale, ENCODING_LEN); 285 } else { 286 success = 0; 287 break; 288 } 289 } else { 290 if (!dupcomponent(type, base, new)) { 291 success = 0; 292 break; 293 } 294 } 295 mask >>= 1; 296 } 297 if (0 == success) { 298 xlocale_release(new); 299 new = NULL; 300 } 301 302 return (new); 303 } 304 305 locale_t duplocale(locale_t base) 306 { 307 locale_t new = alloc_locale(); 308 int type; 309 310 _once(&once_control, init_key); 311 312 if (NULL == new) { 313 return (NULL); 314 } 315 316 FIX_LOCALE(base); 317 copyflags(new, base); 318 319 for (type=0 ; type<XLC_LAST ; type++) { 320 dupcomponent(type, base, new); 321 } 322 323 return (new); 324 } 325 326 /* 327 * Free a locale_t. This is quite a poorly named function. It actually 328 * disclaims a reference to a locale_t, rather than freeing it. 329 */ 330 void 331 freelocale(locale_t loc) 332 { 333 334 /* 335 * Fail if we're passed something that isn't a locale. If we're 336 * passed the global locale, pretend that we freed it but don't 337 * actually do anything. 338 */ 339 if (loc != NULL && loc != LC_GLOBAL_LOCALE && 340 loc != &__xlocale_global_locale) 341 xlocale_release(loc); 342 } 343 344 /* 345 * Returns the name of the locale for a particular component of a locale_t. 346 */ 347 const char *querylocale(int mask, locale_t loc) 348 { 349 int type = ffs(mask) - 1; 350 FIX_LOCALE(loc); 351 if (type >= XLC_LAST) 352 return (NULL); 353 if (loc->components[type]) 354 return (loc->components[type]->locale); 355 return ("C"); 356 } 357 358 /* 359 * Installs the specified locale_t as this thread's locale. 360 */ 361 locale_t uselocale(locale_t loc) 362 { 363 locale_t old = get_thread_locale(); 364 if (NULL != loc) { 365 set_thread_locale(loc); 366 } 367 return (old ? old : LC_GLOBAL_LOCALE); 368 } 369 370