lib/libc/locale/setlocale.c

   1 /* $NetBSD: setlocale.c,v 1.60 2012/03/04 21:14:56 tnozaki Exp $ */
   2
   3 /*-
   4  * Copyright (c)2008 Citrus Project,
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 #if defined(LIBC_SCCS) && !defined(lint)
  31 __RCSID("$NetBSD: setlocale.c,v 1.60 2012/03/04 21:14:56 tnozaki Exp $");
  32 #endif /* LIBC_SCCS and not lint */
  33
  34 #include <sys/types.h>
  35 #include <locale.h>
  36 #include <limits.h>
  37 #include <paths.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <unistd.h>
  41
  42 #include "setlocale_local.h"
  43
  44 const char *_PathLocale = NULL;
  45
  46 static _locale_set_t all_categories[_LC_LAST] = {
  47         [LC_ALL     ] = &_generic_LC_ALL_setlocale,
  48         [LC_COLLATE ] = &_dummy_LC_COLLATE_setlocale,
  49         [LC_CTYPE   ] = &_citrus_LC_CTYPE_setlocale,
  50         [LC_MONETARY] = &_citrus_LC_MONETARY_setlocale,
  51         [LC_NUMERIC ] = &_citrus_LC_NUMERIC_setlocale,
  52         [LC_TIME    ] = &_citrus_LC_TIME_setlocale,
  53         [LC_MESSAGES] = &_citrus_LC_MESSAGES_setlocale,
  54 };
  55
  56 _locale_set_t
  57 _find_category(int category)
  58 {
  59         if (category >= LC_ALL && category < _LC_LAST)
  60                 return all_categories[category];
  61         return NULL;
  62 }
  63
  64 const char *
  65 _get_locale_env(const char *category)
  66 {
  67         const char *name;
  68
  69         /* 1. check LC_ALL */
  70         name = (const char *)getenv("LC_ALL");
  71         if (name == NULL || *name == '\0') {
  72                 /* 2. check LC_* */
  73                 name = (const char *)getenv(category);
  74                 if (name == NULL || *name == '\0') {
  75                         /* 3. check LANG */
  76                         name = getenv("LANG");
  77                 }
  78         }
  79         if (name == NULL || *name == '\0' || strchr(name, '/'))
  80                 /* 4. if none is set, fall to "C" */
  81                 name = _C_LOCALE;
  82         return name;
  83 }
  84
  85 char *
  86 __setlocale(int category, const char *name)
  87 {
  88         _locale_set_t sl;
  89         struct _locale_impl_t *impl;
  90
  91         sl = _find_category(category);
  92         if (sl == NULL)
  93                 return NULL;
  94         if (issetugid() || ((_PathLocale == NULL &&
  95             (_PathLocale = getenv("PATH_LOCALE")) == NULL) ||
  96             *_PathLocale == '\0'))
  97                 _PathLocale = _PATH_LOCALE;
  98         impl = *_current_locale();
  99         return __UNCONST((*sl)(name, impl));
 100 }
 101
 102 char *
 103 setlocale(int category, const char *locale)
 104 {
 105
 106         /* locale may be NULL */
 107
 108         __mb_len_max_runtime = MB_LEN_MAX;
 109         return __setlocale(category, locale);
 110 }
 111
 112 #if defined(__minix) && defined(__weak_alias)
 113 __weak_alias(setlocale, __setlocale50)
 114 #endif