lib/libc/locale/setlocale.c

   1 /*
   2  * Copyright (c) 1996 - 2002 FreeBSD Project
   3  * Copyright (c) 1991, 1993
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * This code is derived from software contributed to Berkeley by
   7  * Paul Borman at Krystal Technologies.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)setlocale.c      8.1 (Berkeley) 7/4/93
  34  * $FreeBSD: head/lib/libc/locale/setlocale.c 228921 2011-12-27 23:28:01Z jilles $
  35  */
  36
  37
  38 #include <sys/types.h>
  39 #include <sys/stat.h>
  40 #include <errno.h>
  41 #include <limits.h>
  42 #include <locale.h>
  43 #include <paths.h>      /* for _PATH_LOCALE */
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <unistd.h>
  47 #include "collate.h"
  48 #include "lmonetary.h"  /* for __monetary_load_locale() */
  49 #include "lnumeric.h"   /* for __numeric_load_locale() */
  50 #include "lmessages.h"  /* for __messages_load_locale() */
  51 #include "setlocale.h"
  52 #include "ldpart.h"
  53 #include "../stdtime/timelocal.h" /* for __time_load_locale() */
  54
  55 /*
  56  * Category names for getenv()
  57  */
  58 static const char categories[_LC_LAST][12] = {
  59     "LC_ALL",
  60     "LC_COLLATE",
  61     "LC_CTYPE",
  62     "LC_MONETARY",
  63     "LC_NUMERIC",
  64     "LC_TIME",
  65     "LC_MESSAGES",
  66 };
  67
  68 /*
  69  * Current locales for each category
  70  */
  71 static char current_categories[_LC_LAST][ENCODING_LEN + 1] = {
  72     "C",
  73     "C",
  74     "C",
  75     "C",
  76     "C",
  77     "C",
  78     "C",
  79 };
  80
  81 /*
  82  * Path to locale storage directory
  83  */
  84 char    *_PathLocale;
  85
  86 /*
  87  * The locales we are going to try and load
  88  */
  89 static char new_categories[_LC_LAST][ENCODING_LEN + 1];
  90 static char saved_categories[_LC_LAST][ENCODING_LEN + 1];
  91
  92 static char current_locale_string[_LC_LAST * (ENCODING_LEN + 1/*"/"*/ + 1)];
  93
  94 static char     *currentlocale(void);
  95 static char     *loadlocale(int);
  96 const char *__get_locale_env(int);
  97
  98 char *
  99 setlocale(int category, const char *locale)
 100 {
 101         int i, j, len, saverr;
 102         const char *env, *r;
 103
 104         if (category < LC_ALL || category >= _LC_LAST) {
 105                 errno = EINVAL;
 106                 return (NULL);
 107         }
 108
 109         if (locale == NULL)
 110                 return (category != LC_ALL ?
 111                     current_categories[category] : currentlocale());
 112
 113         /*
 114          * Default to the current locale for everything.
 115          */
 116         for (i = 1; i < _LC_LAST; ++i)
 117                 (void)strcpy(new_categories[i], current_categories[i]);
 118
 119         /*
 120          * Now go fill up new_categories from the locale argument
 121          */
 122         if (!*locale) {
 123                 if (category == LC_ALL) {
 124                         for (i = 1; i < _LC_LAST; ++i) {
 125                                 env = __get_locale_env(i);
 126                                 if (strlen(env) > ENCODING_LEN) {
 127                                         errno = EINVAL;
 128                                         return (NULL);
 129                                 }
 130                                 (void)strcpy(new_categories[i], env);
 131                         }
 132                 } else {
 133                         env = __get_locale_env(category);
 134                         if (strlen(env) > ENCODING_LEN) {
 135                                 errno = EINVAL;
 136                                 return (NULL);
 137                         }
 138                         (void)strcpy(new_categories[category], env);
 139                 }
 140         } else if (category != LC_ALL) {
 141                 if (strlen(locale) > ENCODING_LEN) {
 142                         errno = EINVAL;
 143                         return (NULL);
 144                 }
 145                 (void)strcpy(new_categories[category], locale);
 146         } else {
 147                 if ((r = strchr(locale, '/')) == NULL) {
 148                         if (strlen(locale) > ENCODING_LEN) {
 149                                 errno = EINVAL;
 150                                 return (NULL);
 151                         }
 152                         for (i = 1; i < _LC_LAST; ++i)
 153                                 (void)strcpy(new_categories[i], locale);
 154                 } else {
 155                         for (i = 1; r[1] == '/'; ++r)
 156                                 ;
 157                         if (!r[1]) {
 158                                 errno = EINVAL;
 159                                 return (NULL);  /* Hmm, just slashes... */
 160                         }
 161                         do {
 162                                 if (i == _LC_LAST)
 163                                         break;  /* Too many slashes... */
 164                                 if ((len = r - locale) > ENCODING_LEN) {
 165                                         errno = EINVAL;
 166                                         return (NULL);
 167                                 }
 168                                 (void)strlcpy(new_categories[i], locale,
 169                                               len + 1);
 170                                 i++;
 171                                 while (*r == '/')
 172                                         r++;
 173                                 locale = r;
 174                                 while (*r && *r != '/')
 175                                         r++;
 176                         } while (*locale);
 177                         while (i < _LC_LAST) {
 178                                 (void)strcpy(new_categories[i],
 179                                              new_categories[i-1]);
 180                                 i++;
 181                         }
 182                 }
 183         }
 184
 185         if (category != LC_ALL)
 186                 return (loadlocale(category));
 187
 188         for (i = 1; i < _LC_LAST; ++i) {
 189                 (void)strcpy(saved_categories[i], current_categories[i]);
 190                 if (loadlocale(i) == NULL) {
 191                         saverr = errno;
 192                         for (j = 1; j < i; j++) {
 193                                 (void)strcpy(new_categories[j],
 194                                              saved_categories[j]);
 195                                 if (loadlocale(j) == NULL) {
 196                                         (void)strcpy(new_categories[j], "C");
 197                                         (void)loadlocale(j);
 198                                 }
 199                         }
 200                         errno = saverr;
 201                         return (NULL);
 202                 }
 203         }
 204         return (currentlocale());
 205 }
 206
 207 static char *
 208 currentlocale(void)
 209 {
 210         int i;
 211
 212         (void)strcpy(current_locale_string, current_categories[1]);
 213
 214         for (i = 2; i < _LC_LAST; ++i)
 215                 if (strcmp(current_categories[1], current_categories[i])) {
 216                         for (i = 2; i < _LC_LAST; ++i) {
 217                                 (void)strcat(current_locale_string, "/");
 218                                 (void)strcat(current_locale_string,
 219                                              current_categories[i]);
 220                         }
 221                         break;
 222                 }
 223         return (current_locale_string);
 224 }
 225
 226 static char *
 227 loadlocale(int category)
 228 {
 229         char *new = new_categories[category];
 230         char *old = current_categories[category];
 231         int (*func)(const char *);
 232         int saved_errno;
 233
 234         if ((new[0] == '.' &&
 235              (new[1] == '\0' || (new[1] == '.' && new[2] == '\0'))) ||
 236             strchr(new, '/') != NULL) {
 237                 errno = EINVAL;
 238                 return (NULL);
 239         }
 240
 241         saved_errno = errno;
 242         errno = __detect_path_locale();
 243         if (errno != 0)
 244                 return (NULL);
 245         errno = saved_errno;
 246
 247         switch (category) {
 248         case LC_CTYPE:
 249                 func = __wrap_setrunelocale;
 250                 break;
 251         case LC_COLLATE:
 252                 func = __collate_load_tables;
 253                 break;
 254         case LC_TIME:
 255                 func = __time_load_locale;
 256                 break;
 257         case LC_NUMERIC:
 258                 func = __numeric_load_locale;
 259                 break;
 260         case LC_MONETARY:
 261                 func = __monetary_load_locale;
 262                 break;
 263         case LC_MESSAGES:
 264                 func = __messages_load_locale;
 265                 break;
 266         default:
 267                 errno = EINVAL;
 268                 return (NULL);
 269         }
 270
 271         if (strcmp(new, old) == 0)
 272                 return (old);
 273
 274         if (func(new) != _LDP_ERROR) {
 275                 (void)strcpy(old, new);
 276                 (void)strcpy(__xlocale_global_locale.components[category-1]->locale, new);
 277                 return (old);
 278         }
 279
 280         return (NULL);
 281 }
 282
 283 const char *
 284 __get_locale_env(int category)
 285 {
 286         const char *env;
 287
 288         /* 1. check LC_ALL. */
 289         env = getenv(categories[0]);
 290
 291         /* 2. check LC_* */
 292         if (env == NULL || !*env)
 293                 env = getenv(categories[category]);
 294
 295         /* 3. check LANG */
 296         if (env == NULL || !*env)
 297                 env = getenv("LANG");
 298
 299         /* 4. if none is set, fall to "C" */
 300         if (env == NULL || !*env)
 301                 env = "C";
 302
 303         return (env);
 304 }
 305
 306 /*
 307  * Detect locale storage location and store its value to _PathLocale variable
 308  */
 309 int
 310 __detect_path_locale(void)
 311 {
 312         if (_PathLocale == NULL) {
 313                 char *p = getenv("PATH_LOCALE");
 314
 315                 if (p != NULL && !issetugid()) {
 316                         if (strlen(p) + 1/*"/"*/ + ENCODING_LEN +
 317                             1/*"/"*/ + CATEGORY_LEN >= PATH_MAX)
 318                                 return (ENAMETOOLONG);
 319                         _PathLocale = strdup(p);
 320                         if (_PathLocale == NULL)
 321                                 return (errno == 0 ? ENOMEM : errno);
 322                 } else
 323                         _PathLocale = _PATH_LOCALE;
 324         }
 325         return (0);
 326 }