1 /*- 2 * Copyright (c) 2011 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by David Chisnall under sponsorship from 6 * the FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD: head/lib/libc/locale/xlocale.c 232498 2012-03-04 15:31:13Z theraven $ 30 */ 31 32 #include <pthread.h> 33 #include <stdio.h> 34 #include <string.h> 35 #include <runetype.h> 36 #include "libc_private.h" 37 #include "xlocale_private.h" 38 39 /** 40 * Each locale loader declares a global component. This is used by setlocale() 41 * and also by xlocale with LC_GLOBAL_LOCALE.. 42 */ 43 extern struct xlocale_component __xlocale_global_collate; 44 extern struct xlocale_component __xlocale_global_ctype; 45 extern struct xlocale_component __xlocale_global_monetary; 46 extern struct xlocale_component __xlocale_global_numeric; 47 extern struct xlocale_component __xlocale_global_time; 48 extern struct xlocale_component __xlocale_global_messages; 49 /* 50 * And another version for the statically-allocated C locale. We only have 51 * components for the parts that are expected to be sensible. 52 */ 53 extern struct xlocale_component __xlocale_C_collate; 54 extern struct xlocale_component __xlocale_C_ctype; 55 56 #ifndef __NO_TLS 57 /* 58 * The locale for this thread. 59 */ 60 __thread locale_t __thread_locale; 61 #endif 62 /* 63 * Flag indicating that one or more per-thread locales exist. 64 */ 65 int __has_thread_locale; 66 /* 67 * Private functions in setlocale.c. 68 */ 69 const char * 70 __get_locale_env(int category); 71 int 72 __detect_path_locale(void); 73 74 struct _xlocale __xlocale_global_locale = { 75 {0}, 76 { 77 &__xlocale_global_collate, 78 &__xlocale_global_ctype, 79 &__xlocale_global_monetary, 80 &__xlocale_global_numeric, 81 &__xlocale_global_time, 82 &__xlocale_global_messages 83 }, 84 1, 85 0, 86 1, 87 0 88 }; 89 90 struct _xlocale __xlocale_C_locale = { 91 {0}, 92 { 93 &__xlocale_C_collate, 94 &__xlocale_C_ctype, 95 0, 0, 0, 0 96 }, 97 1, 98 0, 99 1, 100 0 101 }; 102 103 static void*(*constructors[])(const char*, locale_t) = 104 { 105 __collate_load, 106 __ctype_load, 107 __monetary_load, 108 __numeric_load, 109 __time_load, 110 __messages_load 111 }; 112 113 static pthread_key_t locale_info_key; 114 static int fake_tls; 115 static locale_t thread_local_locale; 116 117 static void init_key(void) 118 { 119 120 pthread_key_create(&locale_info_key, xlocale_release); 121 pthread_setspecific(locale_info_key, (void*)42); 122 if (pthread_getspecific(locale_info_key) == (void*)42) { 123 pthread_setspecific(locale_info_key, 0); 124 } else { 125 fake_tls = 1; 126 } 127 /* At least one per-thread locale has now been set. */ 128 __has_thread_locale = 1; 129 __detect_path_locale(); 130 } 131 132 static pthread_once_t once_control = PTHREAD_ONCE_INIT; 133 134 static locale_t 135 get_thread_locale(void) 136 { 137 138 _once(&once_control, init_key); 139 140 return (fake_tls ? thread_local_locale : 141 pthread_getspecific(locale_info_key)); 142 } 143 144 #ifdef __NO_TLS 145 locale_t 146 __get_locale(void) 147 { 148 locale_t l = get_thread_locale(); 149 return (l ? l : &__xlocale_global_locale); 150 151 } 152 #endif 153 154 static void 155 set_thread_locale(locale_t loc) 156 { 157 158 _once(&once_control, init_key); 159 160 if (NULL != loc) { 161 xlocale_retain((struct xlocale_refcounted*)loc); 162 } 163 locale_t old = pthread_getspecific(locale_info_key); 164 if ((NULL != old) && (loc != old)) { 165 xlocale_release((struct xlocale_refcounted*)old); 166 } 167 if (fake_tls) { 168 thread_local_locale = loc; 169 } else { 170 pthread_setspecific(locale_info_key, loc); 171 } 172 #ifndef __NO_TLS 173 __thread_locale = loc; 174 __set_thread_rune_locale(loc); 175 #endif 176 } 177 178 /** 179 * Clean up a locale, once its reference count reaches zero. This function is 180 * called by xlocale_release(), it should not be called directly. 181 */ 182 static void 183 destruct_locale(void *l) 184 { 185 locale_t loc = l; 186 187 for (int type=0 ; type<XLC_LAST ; type++) { 188 if (loc->components[type]) { 189 xlocale_release(loc->components[type]); 190 } 191 } 192 if (loc->csym) { 193 free(loc->csym); 194 } 195 free(l); 196 } 197 198 /** 199 * Allocates a new, uninitialised, locale. 200 */ 201 static locale_t 202 alloc_locale(void) 203 { 204 locale_t new = calloc(sizeof(struct _xlocale), 1); 205 206 new->header.destructor = destruct_locale; 207 new->monetary_locale_changed = 1; 208 new->numeric_locale_changed = 1; 209 return (new); 210 } 211 static void 212 copyflags(locale_t new, locale_t old) 213 { 214 new->using_monetary_locale = old->using_monetary_locale; 215 new->using_numeric_locale = old->using_numeric_locale; 216 new->using_time_locale = old->using_time_locale; 217 new->using_messages_locale = old->using_messages_locale; 218 } 219 220 static int dupcomponent(int type, locale_t base, locale_t new) 221 { 222 /* Always copy from the global locale, since it has mutable components. 223 */ 224 struct xlocale_component *src = base->components[type]; 225 226 if (&__xlocale_global_locale == base) { 227 new->components[type] = constructors[type](src->locale, new); 228 if (new->components[type]) { 229 strncpy(new->components[type]->locale, src->locale, 230 ENCODING_LEN); 231 } 232 } else if (base->components[type]) { 233 new->components[type] = xlocale_retain(base->components[type]); 234 } else { 235 /* If the component was NULL, return success - if base is a 236 * valid locale then the flag indicating that this isn't 237 * present should be set. If it isn't a valid locale, then 238 * we're stuck anyway. */ 239 return 1; 240 } 241 return (0 != new->components[type]); 242 } 243 244 /* 245 * Public interfaces. These are the five public functions described by the 246 * xlocale interface. 247 */ 248 249 locale_t newlocale(int mask, const char *locale, locale_t base) 250 { 251 int type; 252 const char *realLocale = locale; 253 int useenv = 0; 254 int success = 1; 255 256 _once(&once_control, init_key); 257 258 locale_t new = alloc_locale(); 259 if (NULL == new) { 260 return (NULL); 261 } 262 263 FIX_LOCALE(base); 264 copyflags(new, base); 265 266 if (NULL == locale) { 267 realLocale = "C"; 268 } else if ('\0' == locale[0]) { 269 useenv = 1; 270 } 271 272 for (type=0 ; type<XLC_LAST ; type++) { 273 if (mask & 1) { 274 if (useenv) { 275 realLocale = __get_locale_env(type); 276 } 277 new->components[type] = 278 constructors[type](realLocale, new); 279 if (new->components[type]) { 280 strncpy(new->components[type]->locale, 281 realLocale, ENCODING_LEN); 282 } else { 283 success = 0; 284 break; 285 } 286 } else { 287 if (!dupcomponent(type, base, new)) { 288 success = 0; 289 break; 290 } 291 } 292 mask >>= 1; 293 } 294 if (0 == success) { 295 xlocale_release(new); 296 new = NULL; 297 } 298 299 return (new); 300 } 301 302 locale_t duplocale(locale_t base) 303 { 304 locale_t new = alloc_locale(); 305 int type; 306 307 _once(&once_control, init_key); 308 309 if (NULL == new) { 310 return (NULL); 311 } 312 313 FIX_LOCALE(base); 314 copyflags(new, base); 315 316 for (type=0 ; type<XLC_LAST ; type++) { 317 dupcomponent(type, base, new); 318 } 319 320 return (new); 321 } 322 323 /* 324 * Free a locale_t. This is quite a poorly named function. It actually 325 * disclaims a reference to a locale_t, rather than freeing it. 326 */ 327 int 328 freelocale(locale_t loc) 329 { 330 /* Fail if we're passed something that isn't a locale. */ 331 if ((NULL == loc) || (LC_GLOBAL_LOCALE == loc)) { 332 return (-1); 333 } 334 /* If we're passed the global locale, pretend that we freed it but don't 335 * actually do anything. */ 336 if (&__xlocale_global_locale == loc) { 337 return (0); 338 } 339 xlocale_release(loc); 340 return (0); 341 } 342 343 /* 344 * Returns the name of the locale for a particular component of a locale_t. 345 */ 346 const char *querylocale(int mask, locale_t loc) 347 { 348 int type = ffs(mask) - 1; 349 FIX_LOCALE(loc); 350 if (type >= XLC_LAST) 351 return (NULL); 352 if (loc->components[type]) 353 return (loc->components[type]->locale); 354 return ("C"); 355 } 356 357 /* 358 * Installs the specified locale_t as this thread's locale. 359 */ 360 locale_t uselocale(locale_t loc) 361 { 362 locale_t old = get_thread_locale(); 363 if (NULL != loc) { 364 if (LC_GLOBAL_LOCALE == loc) { 365 loc = NULL; 366 } 367 set_thread_locale(loc); 368 } 369 return (old ? old : LC_GLOBAL_LOCALE); 370 } 371 372