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 "xlocale_private.h"
  41
  42 #include <sys/types.h>
  43 #include <sys/stat.h>
  44 #include <errno.h>
  45 #include <limits.h>
  46 #include <locale.h>
  47 #include <paths.h>      /* for _PATH_LOCALE */
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <unistd.h>
  51 #include "collate.h"
  52 #include "lmonetary.h"  /* for __monetary_load_locale() */
  53 #include "lnumeric.h"   /* for __numeric_load_locale() */
  54 #include "lmessages.h"  /* for __messages_load_locale() */
  55 #include "setlocale.h"
  56 #include "ldpart.h"
  57 #include "timelocal.h" /* for __time_load_locale() */
  58
  59 /*
  60  * Category names for getenv()
  61  */
  62 static const char * const categories[_LC_LAST] = {
  63     "LC_ALL",
  64     "LC_COLLATE",
  65     "LC_CTYPE",
  66     "LC_MONETARY",
  67     "LC_NUMERIC",
  68     "LC_TIME",
  69     "LC_MESSAGES",
  70 };
  71
  72 /*
  73  * Current locales for each category
  74  */
  75 static char current_categories[_LC_LAST][ENCODING_LEN + 1] = {
  76     "C",
  77     "C",
  78     "C",
  79     "C",
  80     "C",
  81     "C",
  82     "C",
  83 };
  84
  85 /*
  86  * Path to locale storage directory
  87  */
  88 char    *_PathLocale;
  89
  90 /*
  91  * The locales we are going to try and load
  92  */
  93 static char new_categories[_LC_LAST][ENCODING_LEN + 1];
  94 static char saved_categories[_LC_LAST][ENCODING_LEN + 1];
  95
  96 static char     *currentlocale(void);
  97 static char     *loadlocale(int);
  98 __private_extern__ const char *__get_locale_env(int);
  99
 100 #define UNLOCK_AND_RETURN(x)    {XL_UNLOCK(&__global_locale); return (x);}
 101
 102 char *
 103 setlocale(category, locale)
 104         int category;
 105         const char *locale;
 106 {
 107         int i, j, len, saverr, save__numeric_fp_cvt;
 108         const char *env, *r;
 109         locale_t save__lc_numeric_loc;
 110
 111         if (category < LC_ALL || category >= _LC_LAST) {
 112                 errno = EINVAL;
 113                 return (NULL);
 114         }
 115
 116         if (locale == NULL)
 117                 return (category != LC_ALL ?
 118                     current_categories[category] : currentlocale());
 119
 120         XL_LOCK(&__global_locale);
 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                                         UNLOCK_AND_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                                 UNLOCK_AND_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                         UNLOCK_AND_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                                 UNLOCK_AND_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                                 UNLOCK_AND_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                                         UNLOCK_AND_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                 UNLOCK_AND_RETURN (loadlocale(category));
 195
 196         save__numeric_fp_cvt = __global_locale.__numeric_fp_cvt;
 197         save__lc_numeric_loc = __global_locale.__lc_numeric_loc;
 198         XL_RETAIN(save__lc_numeric_loc);
 199         for (i = 1; i < _LC_LAST; ++i) {
 200                 (void)strcpy(saved_categories[i], current_categories[i]);
 201                 if (loadlocale(i) == NULL) {
 202                         saverr = errno;
 203                         for (j = 1; j < i; j++) {
 204                                 (void)strcpy(new_categories[j],
 205                                              saved_categories[j]);
 206                                 if (loadlocale(j) == NULL) {
 207                                         (void)strcpy(new_categories[j], "C");
 208                                         (void)loadlocale(j);
 209                                 }
 210                         }
 211                         __global_locale.__numeric_fp_cvt = save__numeric_fp_cvt;
 212                         __global_locale.__lc_numeric_loc = save__lc_numeric_loc;
 213                         XL_RELEASE(save__lc_numeric_loc);
 214                         errno = saverr;
 215                         UNLOCK_AND_RETURN (NULL);
 216                 }
 217         }
 218         XL_RELEASE(save__lc_numeric_loc);
 219         UNLOCK_AND_RETURN (currentlocale());
 220 }
 221
 222 static char *
 223 currentlocale()
 224 {
 225         int i;
 226
 227         size_t bufsiz = _LC_LAST * (ENCODING_LEN + 1/*"/"*/ + 1);
 228         static char *current_locale_string = NULL;
 229
 230         if (current_locale_string == NULL) {
 231                 current_locale_string = malloc(bufsiz);
 232                 if (current_locale_string == NULL) {
 233                         return NULL;
 234                 }
 235         }
 236
 237         (void)strlcpy(current_locale_string, current_categories[1], bufsiz);
 238
 239         for (i = 2; i < _LC_LAST; ++i)
 240                 if (strcmp(current_categories[1], current_categories[i])) {
 241                         for (i = 2; i < _LC_LAST; ++i) {
 242                                 (void)strcat(current_locale_string, "/");
 243                                 (void)strcat(current_locale_string,
 244                                              current_categories[i]);
 245                         }
 246                         break;
 247                 }
 248         return (current_locale_string);
 249 }
 250
 251 static char *
 252 loadlocale(category)
 253         int category;
 254 {
 255         char *new = new_categories[category];
 256         char *old = current_categories[category];
 257         int (*func)(const char *, locale_t);
 258         int saved_errno;
 259
 260         if ((new[0] == '.' &&
 261              (new[1] == '\0' || (new[1] == '.' && new[2] == '\0'))) ||
 262             strchr(new, '/') != NULL) {
 263                 errno = EINVAL;
 264                 return (NULL);
 265         }
 266
 267         saved_errno = errno;
 268         errno = __detect_path_locale();
 269         if (errno != 0)
 270                 return (NULL);
 271         errno = saved_errno;
 272
 273         switch (category) {
 274         case LC_CTYPE:
 275                 func = __wrap_setrunelocale;
 276                 break;
 277         case LC_COLLATE:
 278                 func = __collate_load_tables;
 279                 break;
 280         case LC_TIME:
 281                 func = __time_load_locale;
 282                 break;
 283         case LC_NUMERIC:
 284                 func = __numeric_load_locale;
 285                 break;
 286         case LC_MONETARY:
 287                 func = __monetary_load_locale;
 288                 break;
 289         case LC_MESSAGES:
 290                 func = __messages_load_locale;
 291                 break;
 292         default:
 293                 errno = EINVAL;
 294                 return (NULL);
 295         }
 296
 297         if (strcmp(new, old) == 0)
 298                 return (old);
 299
 300         if (func(new, &__global_locale) != _LDP_ERROR) {
 301                 (void)strcpy(old, new);
 302                 switch (category) {
 303                 case LC_CTYPE:
 304                         if (__global_locale.__numeric_fp_cvt == LC_NUMERIC_FP_SAME_LOCALE)
 305                                 __global_locale.__numeric_fp_cvt = LC_NUMERIC_FP_UNINITIALIZED;
 306                         break;
 307                 case LC_NUMERIC:
 308                         __global_locale.__numeric_fp_cvt = LC_NUMERIC_FP_UNINITIALIZED;
 309                         XL_RELEASE(__global_locale.__lc_numeric_loc);
 310                         __global_locale.__lc_numeric_loc = NULL;
 311                         break;
 312                 }
 313                 return (old);
 314         }
 315
 316         return (NULL);
 317 }
 318
 319 __private_extern__ const char *
 320 __get_locale_env(category)
 321         int category;
 322 {
 323         const char *env;
 324
 325         /* 1. check LC_ALL. */
 326         env = getenv(categories[0]);
 327
 328         /* 2. check LC_* */
 329         if (env == NULL || !*env)
 330                 env = getenv(categories[category]);
 331
 332         /* 3. check LANG */
 333         if (env == NULL || !*env)
 334                 env = getenv("LANG");
 335
 336         /* 4. if none is set, fall to "C" */
 337         if (env == NULL || !*env)
 338                 env = "C";
 339
 340         return (env);
 341 }
 342
 343 /*
 344  * Detect locale storage location and store its value to _PathLocale variable
 345  */
 346 __private_extern__ int
 347 __detect_path_locale(void)
 348 {
 349         if (_PathLocale == NULL) {
 350                 char *p = getenv("PATH_LOCALE");
 351
 352                 if (p != NULL && !issetugid()) {
 353                         if (strlen(p) + 1/*"/"*/ + ENCODING_LEN +
 354                             1/*"/"*/ + CATEGORY_LEN >= PATH_MAX)
 355                                 return (ENAMETOOLONG);
 356                         _PathLocale = strdup(p);
 357                         if (_PathLocale == NULL)
 358                                 return (errno == 0 ? ENOMEM : errno);
 359                 } else
 360                         _PathLocale = _PATH_LOCALE;
 361         }
 362         return (0);
 363 }
 364