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 303495 2016-07-29 17:18:47Z ed $ 30 */ 31 32 #include <errno.h> 33 #include <pthread.h> 34 #include <stdio.h> 35 #include <string.h> 36 #include <runetype.h> 37 #include "libc_private.h" 38 #include "xlocale_private.h" 39 40 /** 41 * Each locale loader declares a global component. This is used by setlocale() 42 * and also by xlocale with LC_GLOBAL_LOCALE.. 43 */ 44 extern struct xlocale_component __xlocale_global_collate; 45 extern struct xlocale_component __xlocale_global_ctype; 46 extern struct xlocale_component __xlocale_global_monetary; 47 extern struct xlocale_component __xlocale_global_numeric; 48 extern struct xlocale_component __xlocale_global_time; 49 extern struct xlocale_component __xlocale_global_messages; 50 /* 51 * And another version for the statically-allocated C locale. We only have 52 * components for the parts that are expected to be sensible. 53 */ 54 extern struct xlocale_component __xlocale_C_collate; 55 extern struct xlocale_component __xlocale_C_ctype; 56 57 #ifndef __NO_TLS 58 /* 59 * The locale for this thread. 60 */ 61 __thread locale_t __thread_locale; 62 #endif 63 /* 64 * Flag indicating that one or more per-thread locales exist. 65 */ 66 int __has_thread_locale; 67 /* 68 * Private functions in setlocale.c. 69 */ 70 const char * __get_locale_env(int category); 71 int __get_locale_str(int category, const char *str, char * const res); 72 int __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 const char *np, *cp; 255 char lres[ENCODING_LEN + 1] = ""; 256 int len; 257 int useenv = 0; 258 int useslh = 0; 259 int usestr = 0; 260 int success = 1; 261 262 _once(&once_control, init_key); 263 264 locale_t new = alloc_locale(); 265 if (NULL == new) { 266 return (NULL); 267 } 268 269 FIX_LOCALE(base); 270 copyflags(new, base); 271 272 if (NULL == locale) { 273 realLocale = "C"; 274 } else if ('\0' == locale[0]) { 275 useenv = 1; 276 } else if (strchr(locale, '/') != NULL) { 277 /* 278 * Handle system native locale string 279 * e.g. "C/en_US.UTF-8/C/C/lt_LT/C" 280 */ 281 useslh = 1; 282 np = locale; 283 } else if ('L' == locale[0] && strchr(locale, ';') != NULL) { 284 /* 285 * We are called from c++ runtime lib with LC_*; string?? 286 */ 287 usestr = 1; 288 } 289 290 for (type=0 ; type<XLC_LAST ; type++) { 291 if (useslh) { 292 cp = strchr(np, '/'); 293 if (cp == NULL && type == XLC_LAST - 1) { 294 cp = locale + strlen(locale); 295 } else if (cp == NULL || type == XLC_LAST - 1) { 296 errno = EINVAL; 297 success = 0; 298 break; 299 } 300 len = cp - np; 301 if (len > ENCODING_LEN || len <= 0) { 302 errno = EINVAL; 303 success = 0; 304 break; 305 } 306 strncpy(lres, np, len); 307 lres[len] = '\0'; 308 np = cp + 1; 309 } 310 311 if (mask & 1) { 312 if (useenv) { 313 realLocale = __get_locale_env(type + 1); 314 } else if (useslh) { 315 realLocale = lres; 316 } else if (usestr) { 317 __get_locale_str(type + 1, locale, lres); 318 realLocale = lres; 319 } 320 new->components[type] = 321 constructors[type](realLocale, new); 322 if (new->components[type]) { 323 strncpy(new->components[type]->locale, 324 realLocale, ENCODING_LEN); 325 } else { 326 success = 0; 327 break; 328 } 329 } else { 330 if (!dupcomponent(type, base, new)) { 331 success = 0; 332 break; 333 } 334 } 335 mask >>= 1; 336 } 337 if (0 == success) { 338 xlocale_release(new); 339 new = NULL; 340 } 341 342 return (new); 343 } 344 345 locale_t duplocale(locale_t base) 346 { 347 locale_t new = alloc_locale(); 348 int type; 349 350 _once(&once_control, init_key); 351 352 if (NULL == new) { 353 return (NULL); 354 } 355 356 FIX_LOCALE(base); 357 copyflags(new, base); 358 359 for (type=0 ; type<XLC_LAST ; type++) { 360 dupcomponent(type, base, new); 361 } 362 363 return (new); 364 } 365 366 /* 367 * Free a locale_t. This is quite a poorly named function. It actually 368 * disclaims a reference to a locale_t, rather than freeing it. 369 */ 370 void 371 freelocale(locale_t loc) 372 { 373 374 /* 375 * Fail if we're passed something that isn't a locale. If we're 376 * passed the global locale, pretend that we freed it but don't 377 * actually do anything. 378 */ 379 if (loc != NULL && loc != LC_GLOBAL_LOCALE && 380 loc != &__xlocale_global_locale) 381 xlocale_release(loc); 382 } 383 384 /* 385 * Returns the name of the locale for a particular component of a locale_t. 386 */ 387 const char *querylocale(int mask, locale_t loc) 388 { 389 int type = ffs(mask) - 1; 390 FIX_LOCALE(loc); 391 if (type >= XLC_LAST) 392 return (NULL); 393 if (loc->components[type]) 394 return (loc->components[type]->locale); 395 return ("C"); 396 } 397 398 /* 399 * Installs the specified locale_t as this thread's locale. 400 */ 401 locale_t uselocale(locale_t loc) 402 { 403 locale_t old = get_thread_locale(); 404 if (NULL != loc) { 405 set_thread_locale(loc); 406 } 407 return (old ? old : LC_GLOBAL_LOCALE); 408 } 409 410