lib/libc/locale/setlocale.c

   1 /*      $NetBSD: src/lib/libc/locale/setlocale.c,v 1.47 2004/07/21 20:27:46 tshiozak Exp $      */
   2 /*      $DragonFly: src/lib/libc/locale/setlocale.c,v 1.3 2005/04/21 16:36:34 joerg Exp $ */
   3
   4 /*
   5  * Copyright (c) 1991, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * This code is derived from software contributed to Berkeley by
   9  * Paul Borman at Krystal Technologies.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #define _CTYPE_PRIVATE
  37
  38 #include <sys/types.h>
  39 #include <sys/localedef.h>
  40 #include <sys/stat.h>
  41 #include <assert.h>
  42 #include <ctype.h>
  43 #include <limits.h>
  44 #include <locale.h>
  45 #include <paths.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49 #include <unistd.h>
  50 #include "collate.h"
  51 #include "rune.h"
  52 #include "rune_local.h"
  53
  54 #include "../citrus/citrus_namespace.h"
  55 #include "../citrus/citrus_region.h"
  56 #include "../citrus/citrus_lookup.h"
  57 #include "../citrus/citrus_bcs.h"
  58
  59 #define _LOCALE_ALIAS_NAME      "locale.alias"
  60 #define _LOCALE_SYM_FORCE       "/force"
  61
  62 static char     *currentlocale(void);
  63 static void     revert_to_default(int);
  64 static int      force_locale_enable(int);
  65 static int      load_locale_sub(int, const char *, int);
  66 static char     *loadlocale(int);
  67 static const char *__get_locale_env(int);
  68
  69 static void     revert_collate(void);
  70 static int      load_ctype(const char *);
  71 static void     revert_ctype(void);
  72 static int      load_messages(const char *);
  73
  74 static const struct  {
  75         const char *name;
  76         int (*load_function)(const char *);
  77         void (*revert_function)(void);
  78 } categories[] = {
  79         { "LC_ALL", NULL, NULL },
  80         { "LC_COLLATE", __collate_load_tables, revert_collate },
  81         { "LC_CTYPE", load_ctype, revert_ctype },
  82         { "LC_MONETARY", NULL, NULL },
  83         { "LC_NUMERIC", NULL, NULL },
  84         { "LC_TIME", NULL, NULL },
  85         { "LC_MESSAGES", load_messages, NULL }
  86 };
  87
  88 /*
  89  * Current locales for each category
  90  */
  91 static char current_categories[_LC_LAST][32] = {
  92         "C",
  93         "C",
  94         "C",
  95         "C",
  96         "C",
  97         "C",
  98         "C"
  99 };
 100
 101 /*
 102  * The locales we are going to try and load
 103  */
 104 static char new_categories[_LC_LAST][32];
 105
 106 static char current_locale_string[_LC_LAST * 33];
 107 const char *_PathLocale;
 108
 109 static int
 110 load_ctype(const char *locale)
 111 {
 112         if (_xpg4_setrunelocale(locale))
 113                 return(-1);
 114         if (__runetable_to_netbsd_ctype(locale)) {
 115                 /* very unfortunate, but need to go to "C" locale */
 116                 revert_ctype();
 117                 return(-1);
 118         }
 119
 120         return(0);
 121 }
 122
 123 static void
 124 revert_ctype(void)
 125 {
 126         _xpg4_setrunelocale("C");
 127         __runetable_to_netbsd_ctype("C");
 128 }
 129
 130 static void
 131 revert_collate(void)
 132 {
 133         __collate_load_tables("C");
 134 }
 135
 136 static int
 137 load_messages(const char *locale)
 138 {
 139         char name[PATH_MAX];
 140         struct stat st;
 141
 142         /*
 143          * XXX we don't have LC_MESSAGES support yet,
 144          * but catopen may use the value of LC_MESSAGES category.
 145          * so return successfully if locale directory is present.
 146          */
 147         snprintf(name, sizeof(name), "%s/%s", _PathLocale, locale);
 148
 149         if (stat(name, &st) < 0)
 150                 return(-1);
 151         if (!S_ISDIR(st.st_mode))
 152                 return(-1);
 153         return(0);
 154 }
 155
 156 char *
 157 setlocale(int category, const char *locale)
 158 {
 159         int i, loadlocale_success;
 160         size_t len;
 161         const char *env, *r;
 162
 163         __mb_len_max_runtime = 32;
 164
 165         if (issetugid() ||
 166             (!_PathLocale && !(_PathLocale = getenv("PATH_LOCALE"))))
 167                 _PathLocale = _PATH_LOCALE;
 168
 169         if (category < 0 || category >= (int)__arysize(categories))
 170                 return(NULL);
 171
 172         if (locale == NULL)
 173                 return(category ?
 174                     current_categories[category] : currentlocale());
 175
 176         /*
 177          * Default to the current locale for everything.
 178          */
 179         for (i = 1; i < _LC_LAST; ++i)
 180                 strlcpy(new_categories[i], current_categories[i],
 181                         sizeof(new_categories[i]));
 182
 183         /*
 184          * Now go fill up new_categories from the locale argument
 185          */
 186         if (*locale == '\0') {
 187                 if (category == LC_ALL) {
 188                         for (i = 1; i < _LC_LAST; ++i) {
 189                                 env = __get_locale_env(i);
 190                                 strlcpy(new_categories[i], env,
 191                                     sizeof(new_categories[i]));
 192                         }
 193                 }
 194                 else {
 195                         env = __get_locale_env(category);
 196                         strlcpy(new_categories[category], env,
 197                                 sizeof(new_categories[category]));
 198                 }
 199         } else if (category) {
 200                 strlcpy(new_categories[category], locale,
 201                         sizeof(new_categories[category]));
 202         } else {
 203                 if ((r = strchr(locale, '/')) == 0) {
 204                         for (i = 1; i < _LC_LAST; ++i) {
 205                                 strlcpy(new_categories[i], locale,
 206                                         sizeof(new_categories[i]));
 207                         }
 208                 } else {
 209                         for (i = 1;;) {
 210                                 _DIAGASSERT(*r == '/' || *r == 0);
 211                                 _DIAGASSERT(*locale != 0);
 212                                 if (*locale == '/')
 213                                         return(NULL);   /* invalid format. */
 214                                 len = r - locale;
 215                                 if (len + 1 > sizeof(new_categories[i]))
 216                                         return(NULL);   /* too long */
 217                                 memcpy(new_categories[i], locale, len);
 218                                 new_categories[i][len] = '\0';
 219                                 if (*r == 0)
 220                                         break;
 221                                 _DIAGASSERT(*r == '/');
 222                                 if (*(locale = ++r) == 0)
 223                                         /* slash followed by NUL */
 224                                         return(NULL);
 225                                 /* skip until NUL or '/' */
 226                                 while (*r && *r != '/')
 227                                         r++;
 228                                 if (++i == _LC_LAST)
 229                                         return(NULL);   /* too many slashes. */
 230                         }
 231                         if (i + 1 != _LC_LAST)
 232                                 return(NULL);   /* too few slashes. */
 233                 }
 234         }
 235
 236         if (category)
 237                 return(loadlocale(category));
 238
 239         loadlocale_success = 0;
 240         for (i = 1; i < _LC_LAST; ++i) {
 241                 if (loadlocale(i) != NULL)
 242                         loadlocale_success = 1;
 243         }
 244
 245         /*
 246          * If all categories failed, return NULL; we don't need to back
 247          * changes off, since none happened.
 248          */
 249         if (!loadlocale_success)
 250                 return(NULL);
 251
 252         return(currentlocale());
 253 }
 254
 255 static char *
 256 currentlocale(void)
 257 {
 258         int i;
 259
 260         strlcpy(current_locale_string, current_categories[1],
 261                 sizeof(current_locale_string));
 262
 263         for (i = 2; i < _LC_LAST; ++i)
 264                 if (strcmp(current_categories[1], current_categories[i])) {
 265                         snprintf(current_locale_string,
 266                             sizeof(current_locale_string), "%s/%s/%s/%s/%s/%s",
 267                             current_categories[1], current_categories[2],
 268                             current_categories[3], current_categories[4],
 269                             current_categories[5], current_categories[6]);
 270                         break;
 271                 }
 272         return(current_locale_string);
 273 }
 274
 275 static void
 276 revert_to_default(int category)
 277 {
 278         _DIAGASSERT(category >= 0 && category < _LC_LAST);
 279
 280         if (categories[category].revert_function != NULL)
 281                 categories[category].revert_function();
 282 }
 283
 284 static int
 285 force_locale_enable(int category)
 286 {
 287         revert_to_default(category);
 288
 289         return(0);
 290 }
 291
 292 static int
 293 load_locale_sub(int category, const char *locname, int isspecial)
 294 {
 295         char name[PATH_MAX];
 296
 297         /* check for the default locales */
 298         if (!strcmp(new_categories[category], "C") ||
 299             !strcmp(new_categories[category], "POSIX")) {
 300                 revert_to_default(category);
 301                 return(0);
 302         }
 303
 304         /* check whether special symbol */
 305         if (isspecial && _bcs_strcasecmp(locname, _LOCALE_SYM_FORCE) == 0)
 306                 return(force_locale_enable(category));
 307
 308         /* sanity check */
 309         if (strchr(locname, '/') != NULL)
 310                 return(-1);
 311
 312         snprintf(name, sizeof(name), "%s/%s/%s", _PathLocale, locname,
 313                  categories[category].name);
 314
 315         if (category > 0 && category < (int)__arysize(categories) &&
 316             categories[category].load_function != NULL)
 317                 return(categories[category].load_function(locname));
 318
 319         return(0);
 320 }
 321
 322 static char *
 323 loadlocale(int category)
 324 {
 325         char aliaspath[PATH_MAX], loccat[PATH_MAX], buf[PATH_MAX];
 326         const char *alias;
 327
 328         _DIAGASSERT(0 < category && category < __arysize(categories));
 329
 330         if (strcmp(new_categories[category], current_categories[category]) == 0)
 331                 return(current_categories[category]);
 332
 333         /* (1) non-aliased file */
 334         if (!load_locale_sub(category, new_categories[category], 0))
 335                 goto success;
 336
 337         /* (2) lookup locname/catname type alias */
 338         snprintf(aliaspath, sizeof(aliaspath), "%s/" _LOCALE_ALIAS_NAME,
 339                  _PathLocale);
 340         snprintf(loccat, sizeof(loccat), "%s/%s", new_categories[category],
 341                  categories[category].name);
 342         alias = _lookup_alias(aliaspath, loccat, buf, sizeof(buf),
 343                               _LOOKUP_CASE_SENSITIVE);
 344         if (!load_locale_sub(category, alias, 1))
 345                 goto success;
 346
 347         /* (3) lookup locname type alias */
 348         alias = _lookup_alias(aliaspath, new_categories[category],
 349                               buf, sizeof(buf), _LOOKUP_CASE_SENSITIVE);
 350         if (!load_locale_sub(category, alias, 1))
 351                 goto success;
 352
 353         return(NULL);
 354
 355 success:
 356         strlcpy(current_categories[category], new_categories[category],
 357                 sizeof(current_categories[category]));
 358         return(current_categories[category]);
 359 }
 360
 361 static const char *
 362 __get_locale_env(int category)
 363 {
 364         const char *env;
 365
 366         _DIAGASSERT(category != LC_ALL);
 367
 368         /* 1. check LC_ALL. */
 369         env = getenv(categories[0].name);
 370
 371         /* 2. check LC_* */
 372         if (env == NULL || *env == '\0')
 373                 env = getenv(categories[category].name);
 374
 375         /* 3. check LANG */
 376         if (env == NULL || *env == '\0')
 377                 env = getenv("LANG");
 378
 379         /* 4. if none is set, fall to "C" */
 380         if (env == NULL || *env == '\0' || strchr(env, '/'))
 381                 env = "C";
 382
 383         return(env);
 384 }