locale.subproj/setlocale.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) 1991, 1993
  24  *      The Regents of the University of California.  All rights reserved.
  25  *
  26  * This code is derived from software contributed to Berkeley by
  27  * Paul Borman at Krystal Technologies.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  */
  57
  58
  59 #include <limits.h>
  60 #include <locale.h>
  61 #include <rune.h>
  62 #include <stdlib.h>
  63 #include <string.h>
  64
  65 /*
  66  * Category names for getenv()
  67  */
  68 static char *categories[_LC_LAST] = {
  69     "LC_ALL",
  70     "LC_COLLATE",
  71     "LC_CTYPE",
  72     "LC_MONETARY",
  73     "LC_NUMERIC",
  74     "LC_TIME",
  75 };
  76
  77 /*
  78  * Current locales for each category
  79  */
  80 static char current_categories[_LC_LAST][32] = {
  81     "C",
  82     "C",
  83     "C",
  84     "C",
  85     "C",
  86     "C",
  87 };
  88
  89 /*
  90  * The locales we are going to try and load
  91  */
  92 static char new_categories[_LC_LAST][32];
  93
  94 static char current_locale_string[_LC_LAST * 33];
  95 static char *PathLocale;
  96
  97 static char     *currentlocale __P((void));
  98 static char     *loadlocale __P((int));
  99
 100 char *
 101 setlocale(category, locale)
 102         int category;
 103         const char *locale;
 104 {
 105         int found, i, len;
 106         char *env, *r;
 107
 108         if (!PathLocale)
 109                 PathLocale = _PATH_LOCALE;
 110
 111         if (category < 0 || category >= _LC_LAST)
 112                 return (NULL);
 113
 114         if (!locale)
 115                 return (category ?
 116                     current_categories[category] : currentlocale());
 117
 118         /*
 119          * Default to the current locale for everything.
 120          */
 121         for (i = 1; i < _LC_LAST; ++i)
 122                 (void)strcpy(new_categories[i], current_categories[i]);
 123
 124         /*
 125          * Now go fill up new_categories from the locale argument
 126          */
 127         if (!*locale) {
 128                 env = getenv(categories[category]);
 129
 130                 if (!env)
 131                         env = getenv(categories[0]);
 132
 133                 if (!env)
 134                         env = getenv("LANG");
 135
 136                 if (!env)
 137                         env = "C";
 138
 139                 (void) strncpy(new_categories[category], env, 31);
 140                 new_categories[category][31] = 0;
 141                 if (!category) {
 142                         for (i = 1; i < _LC_LAST; ++i) {
 143                                 if (!(env = getenv(categories[i])))
 144                                         env = new_categories[0];
 145                                 (void)strncpy(new_categories[i], env, 31);
 146                                 new_categories[i][31] = 0;
 147                         }
 148                 }
 149         } else if (category)  {
 150                 (void)strncpy(new_categories[category], locale, 31);
 151                 new_categories[category][31] = 0;
 152         } else {
 153                 if ((r = strchr(locale, '/')) == 0) {
 154                         for (i = 1; i < _LC_LAST; ++i) {
 155                                 (void)strncpy(new_categories[i], locale, 31);
 156                                 new_categories[i][31] = 0;
 157                         }
 158                 } else {
 159                         for (i = 1; r[1] == '/'; ++r);
 160                         if (!r[1])
 161                                 return (NULL);  /* Hmm, just slashes... */
 162                         do {
 163                                 len = r - locale > 31 ? 31 : r - locale;
 164                                 (void)strncpy(new_categories[i++], locale, len);
 165                                 new_categories[i++][len] = 0;
 166                                 locale = r;
 167                                 while (*locale == '/')
 168                                     ++locale;
 169                                 while (*++r && *r != '/');
 170                         } while (*locale);
 171                         while (i < _LC_LAST)
 172                                 (void)strcpy(new_categories[i],
 173                                     new_categories[i-1]);
 174                 }
 175         }
 176
 177         if (category)
 178                 return (loadlocale(category));
 179
 180         found = 0;
 181         for (i = 1; i < _LC_LAST; ++i)
 182                 if (loadlocale(i) != NULL)
 183                         found = 1;
 184         if (found)
 185             return (currentlocale());
 186         return (NULL);
 187 }
 188
 189 static char *
 190 currentlocale()
 191 {
 192         int i;
 193
 194         (void)strcpy(current_locale_string, current_categories[1]);
 195
 196         for (i = 2; i < _LC_LAST; ++i)
 197                 if (strcmp(current_categories[1], current_categories[i])) {
 198                         (void)snprintf(current_locale_string,
 199                             sizeof(current_locale_string), "%s/%s/%s/%s/%s",
 200                             current_categories[1], current_categories[2],
 201                             current_categories[3], current_categories[4],
 202                             current_categories[5]);
 203                         break;
 204                 }
 205         return (current_locale_string);
 206 }
 207
 208 static char *
 209 loadlocale(category)
 210         int category;
 211 {
 212         char name[PATH_MAX];
 213
 214         if (strcmp(new_categories[category],
 215             current_categories[category]) == 0)
 216                 return (current_categories[category]);
 217
 218         if (category == LC_CTYPE) {
 219                 if (setrunelocale(new_categories[LC_CTYPE]))
 220                         return (NULL);
 221                 (void)strcpy(current_categories[LC_CTYPE],
 222                     new_categories[LC_CTYPE]);
 223                 return (current_categories[LC_CTYPE]);
 224         }
 225
 226         if (!strcmp(new_categories[category], "C") ||
 227                 !strcmp(new_categories[category], "POSIX")) {
 228
 229                 /*
 230                  * Some day this will need to reset the locale to the default
 231                  * C locale.  Since we have no way to change them as of yet,
 232                  * there is no need to reset them.
 233                  */
 234                 (void)strcpy(current_categories[category],
 235                     new_categories[category]);
 236                 return (current_categories[category]);
 237         }
 238
 239         /*
 240          * Some day we will actually look at this file.
 241          */
 242         (void)snprintf(name, sizeof(name), "%s/%s/%s",
 243             PathLocale, new_categories[category], categories[category]);
 244
 245         switch (category) {
 246                 case LC_COLLATE:
 247                 case LC_MONETARY:
 248                 case LC_NUMERIC:
 249                 case LC_TIME:
 250                         return (NULL);
 251         }
 252 }