lib/libc/locale/xlocale.c

   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 <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         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 void
 329 freelocale(locale_t loc)
 330 {
 331
 332         /*
 333          * Fail if we're passed something that isn't a locale. If we're
 334          * passed the global locale, pretend that we freed it but don't
 335          * actually do anything.
 336          */
 337         if (loc != NULL && loc != LC_GLOBAL_LOCALE &&
 338             loc != &__xlocale_global_locale)
 339                 xlocale_release(loc);
 340 }
 341
 342 /*
 343  * Returns the name of the locale for a particular component of a locale_t.
 344  */
 345 const char *querylocale(int mask, locale_t loc)
 346 {
 347         int type = ffs(mask) - 1;
 348         FIX_LOCALE(loc);
 349         if (type >= XLC_LAST)
 350                 return (NULL);
 351         if (loc->components[type])
 352                 return (loc->components[type]->locale);
 353         return ("C");
 354 }
 355
 356 /*
 357  * Installs the specified locale_t as this thread's locale.
 358  */
 359 locale_t uselocale(locale_t loc)
 360 {
 361         locale_t old = get_thread_locale();
 362         if (NULL != loc) {
 363                 set_thread_locale(loc);
 364         }
 365         return (old ? old : LC_GLOBAL_LOCALE);
 366 }
 367