locale/FreeBSD/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. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by the University of
  20  *      California, Berkeley and its contributors.
  21  * 4. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  */
  37
  38 #if defined(LIBC_SCCS) && !defined(lint)
  39 static char sccsid[] = "@(#)setlocale.c 8.1 (Berkeley) 7/4/93";
  40 #endif /* LIBC_SCCS and not lint */
  41 #include <sys/cdefs.h>
  42 __FBSDID("$FreeBSD: src/lib/libc/locale/setlocale.c,v 1.50 2004/01/31 19:15:32 ache Exp $");
  43
  44 #include <sys/types.h>
  45 #include <sys/stat.h>
  46 #include <errno.h>
  47 #include <limits.h>
  48 #include <locale.h>
  49 #include <paths.h>      /* for _PATH_LOCALE */
  50 #include <stdlib.h>
  51 #include <string.h>
  52 #include <unistd.h>
  53 #include "collate.h"
  54 #include "lmonetary.h"  /* for __monetary_load_locale() */
  55 #include "lnumeric.h"   /* for __numeric_load_locale() */
  56 #include "lmessages.h"  /* for __messages_load_locale() */
  57 #include "setlocale.h"
  58 #include "ldpart.h"
  59 #include "../stdtime/timelocal.h" /* for __time_load_locale() */
  60
  61 /*
  62  * Category names for getenv()
  63  */
  64 static char *categories[_LC_LAST] = {
  65     "LC_ALL",
  66     "LC_COLLATE",
  67     "LC_CTYPE",
  68     "LC_MONETARY",
  69     "LC_NUMERIC",
  70     "LC_TIME",
  71     "LC_MESSAGES",
  72 };
  73
  74 /*
  75  * Current locales for each category
  76  */
  77 static char current_categories[_LC_LAST][ENCODING_LEN + 1] = {
  78     "C",
  79     "C",
  80     "C",
  81     "C",
  82     "C",
  83     "C",
  84     "C",
  85 };
  86
  87 /*
  88  * Path to locale storage directory
  89  */
  90 char    *_PathLocale;
  91
  92 /*
  93  * The locales we are going to try and load
  94  */
  95 static char new_categories[_LC_LAST][ENCODING_LEN + 1];
  96 static char saved_categories[_LC_LAST][ENCODING_LEN + 1];
  97
  98 static char current_locale_string[_LC_LAST * (ENCODING_LEN + 1/*"/"*/ + 1)];
  99
 100 static char     *currentlocale(void);
 101 static char     *loadlocale(int);
 102 static const char *__get_locale_env(int);
 103
 104 char *
 105 setlocale(category, locale)
 106         int category;
 107         const char *locale;
 108 {
 109         int i, j, len, saverr;
 110         const char *env, *r;
 111
 112         if (category < LC_ALL || category >= _LC_LAST) {
 113                 errno = EINVAL;
 114                 return (NULL);
 115         }
 116
 117         if (locale == NULL)
 118                 return (category != LC_ALL ?
 119                     current_categories[category] : currentlocale());
 120
 121         /*
 122          * Default to the current locale for everything.
 123          */
 124         for (i = 1; i < _LC_LAST; ++i)
 125                 (void)strcpy(new_categories[i], current_categories[i]);
 126
 127         /*
 128          * Now go fill up new_categories from the locale argument
 129          */
 130         if (!*locale) {
 131                 if (category == LC_ALL) {
 132                         for (i = 1; i < _LC_LAST; ++i) {
 133                                 env = __get_locale_env(i);
 134                                 if (strlen(env) > ENCODING_LEN) {
 135                                         errno = EINVAL;
 136                                         return (NULL);
 137                                 }
 138                                 (void)strcpy(new_categories[i], env);
 139                         }
 140                 } else {
 141                         env = __get_locale_env(category);
 142                         if (strlen(env) > ENCODING_LEN) {
 143                                 errno = EINVAL;
 144                                 return (NULL);
 145                         }
 146                         (void)strcpy(new_categories[category], env);
 147                 }
 148         } else if (category != LC_ALL) {
 149                 if (strlen(locale) > ENCODING_LEN) {
 150                         errno = EINVAL;
 151                         return (NULL);
 152                 }
 153                 (void)strcpy(new_categories[category], locale);
 154         } else {
 155                 if ((r = strchr(locale, '/')) == NULL) {
 156                         if (strlen(locale) > ENCODING_LEN) {
 157                                 errno = EINVAL;
 158                                 return (NULL);
 159                         }
 160                         for (i = 1; i < _LC_LAST; ++i)
 161                                 (void)strcpy(new_categories[i], locale);
 162                 } else {
 163                         for (i = 1; r[1] == '/'; ++r)
 164                                 ;
 165                         if (!r[1]) {
 166                                 errno = EINVAL;
 167                                 return (NULL);  /* Hmm, just slashes... */
 168                         }
 169                         do {
 170                                 if (i == _LC_LAST)
 171                                         break;  /* Too many slashes... */
 172                                 if ((len = r - locale) > ENCODING_LEN) {
 173                                         errno = EINVAL;
 174                                         return (NULL);
 175                                 }
 176                                 (void)strlcpy(new_categories[i], locale,
 177                                               len + 1);
 178                                 i++;
 179                                 while (*r == '/')
 180                                         r++;
 181                                 locale = r;
 182                                 while (*r && *r != '/')
 183                                         r++;
 184                         } while (*locale);
 185                         while (i < _LC_LAST) {
 186                                 (void)strcpy(new_categories[i],
 187                                              new_categories[i-1]);
 188                                 i++;
 189                         }
 190                 }
 191         }
 192
 193         if (category != LC_ALL)
 194                 return (loadlocale(category));
 195
 196         for (i = 1; i < _LC_LAST; ++i) {
 197                 (void)strcpy(saved_categories[i], current_categories[i]);
 198                 if (loadlocale(i) == NULL) {
 199                         saverr = errno;
 200                         for (j = 1; j < i; j++) {
 201                                 (void)strcpy(new_categories[j],
 202                                              saved_categories[j]);
 203                                 if (loadlocale(j) == NULL) {
 204                                         (void)strcpy(new_categories[j], "C");
 205                                         (void)loadlocale(j);
 206                                 }
 207                         }
 208                         errno = saverr;
 209                         return (NULL);
 210                 }
 211         }
 212         return (currentlocale());
 213 }
 214
 215 static char *
 216 currentlocale()
 217 {
 218         int i;
 219
 220         (void)strcpy(current_locale_string, current_categories[1]);
 221
 222         for (i = 2; i < _LC_LAST; ++i)
 223                 if (strcmp(current_categories[1], current_categories[i])) {
 224                         for (i = 2; i < _LC_LAST; ++i) {
 225                                 (void)strcat(current_locale_string, "/");
 226                                 (void)strcat(current_locale_string,
 227                                              current_categories[i]);
 228                         }
 229                         break;
 230                 }
 231         return (current_locale_string);
 232 }
 233
 234 static char *
 235 loadlocale(category)
 236         int category;
 237 {
 238         char *new = new_categories[category];
 239         char *old = current_categories[category];
 240         int (*func)(const char *);
 241         int saved_errno;
 242
 243         if ((new[0] == '.' &&
 244              (new[1] == '\0' || (new[1] == '.' && new[2] == '\0'))) ||
 245             strchr(new, '/') != NULL) {
 246                 errno = EINVAL;
 247                 return (NULL);
 248         }
 249
 250         saved_errno = errno;
 251         errno = __detect_path_locale();
 252         if (errno != 0)
 253                 return (NULL);
 254         errno = saved_errno;
 255
 256         switch (category) {
 257         case LC_CTYPE:
 258                 func = __wrap_setrunelocale;
 259                 break;
 260         case LC_COLLATE:
 261                 func = __collate_load_tables;
 262                 break;
 263         case LC_TIME:
 264                 func = __time_load_locale;
 265                 break;
 266         case LC_NUMERIC:
 267                 func = __numeric_load_locale;
 268                 break;
 269         case LC_MONETARY:
 270                 func = __monetary_load_locale;
 271                 break;
 272         case LC_MESSAGES:
 273                 func = __messages_load_locale;
 274                 break;
 275         default:
 276                 errno = EINVAL;
 277                 return (NULL);
 278         }
 279
 280         if (strcmp(new, old) == 0)
 281                 return (old);
 282
 283         if (func(new) != _LDP_ERROR) {
 284                 (void)strcpy(old, new);
 285                 return (old);
 286         }
 287
 288         return (NULL);
 289 }
 290
 291 static const char *
 292 __get_locale_env(category)
 293         int category;
 294 {
 295         const char *env;
 296
 297         /* 1. check LC_ALL. */
 298         env = getenv(categories[0]);
 299
 300         /* 2. check LC_* */
 301         if (env == NULL || !*env)
 302                 env = getenv(categories[category]);
 303
 304         /* 3. check LANG */
 305         if (env == NULL || !*env)
 306                 env = getenv("LANG");
 307
 308         /* 4. if none is set, fall to "C" */
 309         if (env == NULL || !*env)
 310                 env = "C";
 311
 312         return (env);
 313 }
 314
 315 /*
 316  * Detect locale storage location and store its value to _PathLocale variable
 317  */
 318 int
 319 __detect_path_locale(void)
 320 {
 321         if (_PathLocale == NULL) {
 322                 char *p = getenv("PATH_LOCALE");
 323
 324                 if (p != NULL && !issetugid()) {
 325                         if (strlen(p) + 1/*"/"*/ + ENCODING_LEN +
 326                             1/*"/"*/ + CATEGORY_LEN >= PATH_MAX)
 327                                 return (ENAMETOOLONG);
 328                         _PathLocale = strdup(p);
 329                         if (_PathLocale == NULL)
 330                                 return (errno == 0 ? ENOMEM : errno);
 331                 } else
 332                         _PathLocale = _PATH_LOCALE;
 333         }
 334         return (0);
 335 }
 336