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 * $FreeBSD$ 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_local 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 locale_t l = (loc == LC_GLOBAL_LOCALE) ? 0 : loc; 158 159 _once(&once_control, init_key); 160 161 if (NULL != l) { 162 xlocale_retain((struct xlocale_refcounted*)l); 163 } 164 locale_t old = pthread_getspecific(locale_info_key); 165 if ((NULL != old) && (l != old)) { 166 xlocale_release((struct xlocale_refcounted*)old); 167 } 168 if (fake_tls) { 169 thread_local_locale = l; 170 } else { 171 pthread_setspecific(locale_info_key, l); 172 } 173 #ifndef __NO_TLS 174 __thread_locale = l; 175 __set_thread_rune_locale(loc); 176 #endif 177 } 178 179 /** 180 * Clean up a locale, once its reference count reaches zero. This function is 181 * called by xlocale_release(), it should not be called directly. 182 */ 183 static void 184 destruct_locale(void *l) 185 { 186 locale_t loc = l; 187 188 for (int type=0 ; type<XLC_LAST ; type++) { 189 if (loc->components[type]) { 190 xlocale_release(loc->components[type]); 191 } 192 } 193 if (loc->csym) { 194 free(loc->csym); 195 } 196 free(l); 197 } 198 199 /** 200 * Allocates a new, uninitialised, locale. 201 */ 202 static locale_t 203 alloc_locale(void) 204 { 205 locale_t new = calloc(sizeof(struct _xlocale), 1); 206 207 new->header.destructor = destruct_locale; 208 new->monetary_locale_changed = 1; 209 new->numeric_locale_changed = 1; 210 return (new); 211 } 212 static void 213 copyflags(locale_t new, locale_t old) 214 { 215 new->using_monetary_locale = old->using_monetary_locale; 216 new->using_numeric_locale = old->using_numeric_locale; 217 new->using_time_locale = old->using_time_locale; 218 new->using_messages_locale = old->using_messages_locale; 219 } 220 221 static int dupcomponent(int type, locale_t base, locale_t new) 222 { 223 /* Always copy from the global locale, since it has mutable components. 224 */ 225 struct xlocale_component *src = base->components[type]; 226 227 if (&__xlocale_global_locale == base) { 228 new->components[type] = constructors[type](src->locale, new); 229 if (new->components[type]) { 230 strncpy(new->components[type]->locale, src->locale, 231 ENCODING_LEN); 232 } 233 } else if (base->components[type]) { 234 new->components[type] = xlocale_retain(base->components[type]); 235 } else { 236 /* If the component was NULL, return success - if base is a 237 * valid locale then the flag indicating that this isn't 238 * present should be set. If it isn't a valid locale, then 239 * we're stuck anyway. */ 240 return 1; 241 } 242 return (0 != new->components[type]); 243 } 244 245 /* 246 * Public interfaces. These are the five public functions described by the 247 * xlocale interface. 248 */ 249 250 locale_t newlocale(int mask, const char *locale, locale_t base) 251 { 252 int type; 253 const char *realLocale = locale; 254 int useenv = 0; 255 int success = 1; 256 257 _once(&once_control, init_key); 258 259 locale_t new = alloc_locale(); 260 if (NULL == new) { 261 return (NULL); 262 } 263 264 FIX_LOCALE(base); 265 copyflags(new, base); 266 267 if (NULL == locale) { 268 realLocale = "C"; 269 } else if ('\0' == locale[0]) { 270 useenv = 1; 271 } 272 273 for (type=0 ; type<XLC_LAST ; type++) { 274 if (mask & 1) { 275 if (useenv) { 276 realLocale = __get_locale_env(type); 277 } 278 new->components[type] = 279 constructors[type](realLocale, new); 280 if (new->components[type]) { 281 strncpy(new->components[type]->locale, 282 realLocale, ENCODING_LEN); 283 } else { 284 success = 0; 285 break; 286 } 287 } else { 288 if (!dupcomponent(type, base, new)) { 289 success = 0; 290 break; 291 } 292 } 293 mask >>= 1; 294 } 295 if (0 == success) { 296 xlocale_release(new); 297 new = NULL; 298 } 299 300 return (new); 301 } 302 303 locale_t duplocale(locale_t base) 304 { 305 locale_t new = alloc_locale(); 306 int type; 307 308 _once(&once_control, init_key); 309 310 if (NULL == new) { 311 return (NULL); 312 } 313 314 FIX_LOCALE(base); 315 copyflags(new, base); 316 317 for (type=0 ; type<XLC_LAST ; type++) { 318 dupcomponent(type, base, new); 319 } 320 321 return (new); 322 } 323 324 /* 325 * Free a locale_t. This is quite a poorly named function. It actually 326 * disclaims a reference to a locale_t, rather than freeing it. 327 */ 328 int 329 freelocale(locale_t loc) 330 { 331 /* Fail if we're passed something that isn't a locale. */ 332 if ((NULL == loc) || (LC_GLOBAL_LOCALE == loc)) { 333 return (-1); 334 } 335 /* If we're passed the global locale, pretend that we freed it but don't 336 * actually do anything. */ 337 if (&__xlocale_global_locale == loc) { 338 return (0); 339 } 340 xlocale_release(loc); 341 return (0); 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