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  * 4. 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
  34 #if defined(LIBC_SCCS) && !defined(lint)
  35 static char sccsid[] = "@(#)setlocale.c 8.1 (Berkeley) 7/4/93";
  36 #endif /* LIBC_SCCS and not lint */
  37 #include <sys/cdefs.h>
  38 __FBSDID("$FreeBSD: src/lib/libc/locale/setlocale.c,v 1.51 2007/01/09 00:28:00 imp Exp $");
  39
  40 #include <sys/types.h>
  41 #include <sys/stat.h>
  42 #include <errno.h>
  43 #include <limits.h>
  44 #include <locale.h>
  45 #include <paths.h>      /* for _PATH_LOCALE */
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <unistd.h>
  49 #include "collate.h"
  50 #include "lmonetary.h"  /* for __monetary_load_locale() */
  51 #include "lnumeric.h"   /* for __numeric_load_locale() */
  52 #include "lmessages.h"  /* for __messages_load_locale() */
  53 #include "setlocale.h"
  54 #include "ldpart.h"
  55 #include "../stdtime/timelocal.h" /* for __time_load_locale() */
  56
  57 /*
  58  * Category names for getenv()
  59  */
  60 static char *categories[_LC_LAST] = {
  61     "LC_ALL",
  62     "LC_COLLATE",
  63     "LC_CTYPE",
  64     "LC_MONETARY",
  65     "LC_NUMERIC",
  66     "LC_TIME",
  67     "LC_MESSAGES",
  68 };
  69
  70 /*
  71  * Current locales for each category
  72  */
  73 static char current_categories[_LC_LAST][ENCODING_LEN + 1] = {
  74     "C",
  75     "C",
  76     "C",
  77     "C",
  78     "C",
  79     "C",
  80     "C",
  81 };
  82
  83 /*
  84  * Path to locale storage directory
  85  */
  86 char    *_PathLocale;
  87
  88 /*
  89  * The locales we are going to try and load
  90  */
  91 static char new_categories[_LC_LAST][ENCODING_LEN + 1];
  92 static char saved_categories[_LC_LAST][ENCODING_LEN + 1];
  93
  94 static char current_locale_string[_LC_LAST * (ENCODING_LEN + 1/*"/"*/ + 1)];
  95
  96 static char     *currentlocale(void);
  97 static char     *loadlocale(int);
  98 static const char *__get_locale_env(int);
  99
 100 char *
 101 setlocale(category, locale)
 102         int category;
 103         const char *locale;
 104 {
 105         int i, j, len, saverr;
 106         const char *env, *r;
 107
 108         if (category < LC_ALL || category >= _LC_LAST) {
 109                 errno = EINVAL;
 110                 return (NULL);
 111         }
 112
 113         if (locale == NULL)
 114                 return (category != LC_ALL ?
 115                     current_categories[category] : currentlocale());
 116
 117         /*
 118          * Default to the current locale for everything.
 119          */
 120         for (i = 1; i < _LC_LAST; ++i)
 121                 (void)strcpy(new_categories[i], current_categories[i]);
 122
 123         /*
 124          * Now go fill up new_categories from the locale argument
 125          */
 126         if (!*locale) {
 127                 if (category == LC_ALL) {
 128                         for (i = 1; i < _LC_LAST; ++i) {
 129                                 env = __get_locale_env(i);
 130                                 if (strlen(env) > ENCODING_LEN) {
 131                                         errno = EINVAL;
 132                                         return (NULL);
 133                                 }
 134                                 (void)strcpy(new_categories[i], env);
 135                         }
 136                 } else {
 137                         env = __get_locale_env(category);
 138                         if (strlen(env) > ENCODING_LEN) {
 139                                 errno = EINVAL;
 140                                 return (NULL);
 141                         }
 142                         (void)strcpy(new_categories[category], env);
 143                 }
 144         } else if (category != LC_ALL) {
 145                 if (strlen(locale) > ENCODING_LEN) {
 146                         errno = EINVAL;
 147                         return (NULL);
 148                 }
 149                 (void)strcpy(new_categories[category], locale);
 150         } else {
 151                 if ((r = strchr(locale, '/')) == NULL) {
 152                         if (strlen(locale) > ENCODING_LEN) {
 153                                 errno = EINVAL;
 154                                 return (NULL);
 155                         }
 156                         for (i = 1; i < _LC_LAST; ++i)
 157                                 (void)strcpy(new_categories[i], locale);
 158                 } else {
 159                         for (i = 1; r[1] == '/'; ++r)
 160                                 ;
 161                         if (!r[1]) {
 162                                 errno = EINVAL;
 163                                 return (NULL);  /* Hmm, just slashes... */
 164                         }
 165                         do {
 166                                 if (i == _LC_LAST)
 167                                         break;  /* Too many slashes... */
 168                                 if ((len = r - locale) > ENCODING_LEN) {
 169                                         errno = EINVAL;
 170                                         return (NULL);
 171                                 }
 172                                 (void)strlcpy(new_categories[i], locale,
 173                                               len + 1);
 174                                 i++;
 175                                 while (*r == '/')
 176                                         r++;
 177                                 locale = r;
 178                                 while (*r && *r != '/')
 179                                         r++;
 180                         } while (*locale);
 181                         while (i < _LC_LAST) {
 182                                 (void)strcpy(new_categories[i],
 183                                              new_categories[i-1]);
 184                                 i++;
 185                         }
 186                 }
 187         }
 188
 189         if (category != LC_ALL)
 190                 return (loadlocale(category));
 191
 192         for (i = 1; i < _LC_LAST; ++i) {
 193                 (void)strcpy(saved_categories[i], current_categories[i]);
 194                 if (loadlocale(i) == NULL) {
 195                         saverr = errno;
 196                         for (j = 1; j < i; j++) {
 197                                 (void)strcpy(new_categories[j],
 198                                              saved_categories[j]);
 199                                 if (loadlocale(j) == NULL) {
 200                                         (void)strcpy(new_categories[j], "C");
 201                                         (void)loadlocale(j);
 202                                 }
 203                         }
 204                         errno = saverr;
 205                         return (NULL);
 206                 }
 207         }
 208         return (currentlocale());
 209 }
 210
 211 static char *
 212 currentlocale()
 213 {
 214         int i;
 215
 216         (void)strcpy(current_locale_string, current_categories[1]);
 217
 218         for (i = 2; i < _LC_LAST; ++i)
 219                 if (strcmp(current_categories[1], current_categories[i])) {
 220                         for (i = 2; i < _LC_LAST; ++i) {
 221                                 (void)strcat(current_locale_string, "/");
 222                                 (void)strcat(current_locale_string,
 223                                              current_categories[i]);
 224                         }
 225                         break;
 226                 }
 227         return (current_locale_string);
 228 }
 229
 230 static char *
 231 loadlocale(category)
 232         int category;
 233 {
 234         char *new = new_categories[category];
 235         char *old = current_categories[category];
 236         int (*func)(const char *);
 237         int saved_errno;
 238
 239         if ((new[0] == '.' &&
 240              (new[1] == '\0' || (new[1] == '.' && new[2] == '\0'))) ||
 241             strchr(new, '/') != NULL) {
 242                 errno = EINVAL;
 243                 return (NULL);
 244         }
 245
 246         saved_errno = errno;
 247         errno = __detect_path_locale();
 248         if (errno != 0)
 249                 return (NULL);
 250         errno = saved_errno;
 251
 252         switch (category) {
 253         case LC_CTYPE:
 254                 func = __wrap_setrunelocale;
 255                 break;
 256         case LC_COLLATE:
 257                 func = __collate_load_tables;
 258                 break;
 259         case LC_TIME:
 260                 func = __time_load_locale;
 261                 break;
 262         case LC_NUMERIC:
 263                 func = __numeric_load_locale;
 264                 break;
 265         case LC_MONETARY:
 266                 func = __monetary_load_locale;
 267                 break;
 268         case LC_MESSAGES:
 269                 func = __messages_load_locale;
 270                 break;
 271         default:
 272                 errno = EINVAL;
 273                 return (NULL);
 274         }
 275
 276         if (strcmp(new, old) == 0)
 277                 return (old);
 278
 279         if (func(new) != _LDP_ERROR) {
 280                 (void)strcpy(old, new);
 281                 return (old);
 282         }
 283
 284         return (NULL);
 285 }
 286
 287 static const char *
 288 __get_locale_env(category)
 289         int category;
 290 {
 291         const char *env;
 292
 293         /* 1. check LC_ALL. */
 294         env = getenv(categories[0]);
 295
 296         /* 2. check LC_* */
 297         if (env == NULL || !*env)
 298                 env = getenv(categories[category]);
 299
 300         /* 3. check LANG */
 301         if (env == NULL || !*env)
 302                 env = getenv("LANG");
 303
 304         /* 4. if none is set, fall to "C" */
 305         if (env == NULL || !*env)
 306                 env = "C";
 307
 308         return (env);
 309 }
 310
 311 /*
 312  * Detect locale storage location and store its value to _PathLocale variable
 313  */
 314 int
 315 __detect_path_locale(void)
 316 {
 317         if (_PathLocale == NULL) {
 318                 char *p = getenv("PATH_LOCALE");
 319
 320                 if (p != NULL && !issetugid()) {
 321                         if (strlen(p) + 1/*"/"*/ + ENCODING_LEN +
 322                             1/*"/"*/ + CATEGORY_LEN >= PATH_MAX)
 323                                 return (ENAMETOOLONG);
 324                         _PathLocale = strdup(p);
 325                         if (_PathLocale == NULL)
 326                                 return (errno == 0 ? ENOMEM : errno);
 327                 } else
 328                         _PathLocale = _PATH_LOCALE;
 329         }
 330         return (0);
 331 }
 332