usr/src/lib/libc/port/locale/setlocale.c

   1 /*
   2  * Copyright 2014 Garrett D'Amore <garrett@damore.org>
   3  * Copyright 2010 Nexenta Systems, Inc.  All rights reserved.
   4  * Copyright (c) 1996 - 2002 FreeBSD Project
   5  * Copyright (c) 1991, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * This code is derived from software contributed to Berkeley by
   9  * Paul Borman at Krystal Technologies.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include "lint.h"
  37 #include <sys/types.h>
  38 #include <sys/stat.h>
  39 #include <errno.h>
  40 #include <limits.h>
  41 #include <locale.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <unistd.h>
  45 #include <stdio.h>
  46 #include "mtlib.h"
  47 #include "collate.h"
  48 #include "lnumeric.h"   /* for struct lc_numeric */
  49 #include "lctype.h"     /* for struct lc_ctype */
  50 #include "runetype.h"
  51 #include "setlocale.h"
  52 #include "../i18n/_loc_path.h"
  53 #include "localeimpl.h"
  54 #include "../i18n/_locale.h"
  55 #include "libc.h"
  56
  57 /*
  58  * Path to locale storage directory.  See ../i18n/_loc_path.h
  59  */
  60 char    *_PathLocale = _DFLT_LOC_PATH;
  61
  62 static void     install_legacy(locale_t, int);
  63
  64 static mutex_t setlocale_lock = DEFAULTMUTEX;
  65 static locale_t setlocale_list = NULL;
  66
  67 char *
  68 setlocale(int category, const char *locname)
  69 {
  70         locale_t loc;
  71         locale_t srch;
  72         int mask;
  73
  74         if (category < 0 || category > LC_ALL) {
  75                 errno = EINVAL;
  76                 return (NULL);
  77         }
  78
  79         if (locname == NULL)
  80                 return (current_locale(___global_locale, category));
  81
  82         mask = (category == LC_ALL ? LC_ALL_MASK : (1 << category));
  83
  84         loc = newlocale(mask, locname, NULL);
  85         if (loc == NULL) {
  86                 return (NULL);
  87         }
  88
  89         /*
  90          * This next logic looks to see if we have ever used the same locale
  91          * settings before.  If so, we reuse it.  We avoid ever calling
  92          * freelocale() on a locale setting built up by setlocale, this
  93          * ensures that consumers (uselocale) will always be thread safe;
  94          * the actual locale data objects are never freed, and unique
  95          * locale objects are also never freed.  We reuse to avoid leaking
  96          * memory in applications that call setlocale repeatedly.
  97          */
  98         lmutex_lock(&setlocale_lock);
  99         for (srch = setlocale_list; srch != NULL; srch = srch->next) {
 100                 if (strcmp(srch->locname, loc->locname) == 0) {
 101                         break;
 102                 }
 103         }
 104
 105         if (srch == NULL) {
 106                 /* this is a new locale, save it for reuse later */
 107                 loc->next = setlocale_list;
 108                 loc->on_list = 1;
 109                 setlocale_list = loc;
 110         } else {
 111                 /* we already had it, toss the new, and use what we found */
 112                 freelocale(loc);
 113                 loc = srch;
 114         }
 115         ___global_locale = loc;
 116
 117         install_legacy(loc, mask);
 118         lmutex_unlock(&setlocale_lock);
 119
 120         return (current_locale(loc, category));
 121 }
 122
 123 char *
 124 current_locale(locale_t loc, int cat)
 125 {
 126         switch (cat) {
 127         case LC_CTYPE:
 128         case LC_COLLATE:
 129         case LC_MESSAGES:
 130         case LC_MONETARY:
 131         case LC_NUMERIC:
 132         case LC_TIME:
 133                 return (loc->locdata[cat]->l_lname);
 134         case LC_ALL:
 135                 return (loc->locname);
 136         default:
 137                 return (NULL);
 138         }
 139 }
 140
 141 static void
 142 install_legacy(locale_t loc, int mask)
 143 {
 144         /*
 145          * Update the legacy fixed variables that may be baked into
 146          * legacy programs.  This is really unfortunate, but we can't
 147          * solve for them otherwise.  Note that such legacy programs
 148          * are only going to see the global locale settings, and cannot
 149          * benefit from uselocale().
 150          */
 151         if (mask & LC_NUMERIC_MASK) {
 152                 struct lc_numeric *lnum;
 153                 lnum = loc->locdata[LC_NUMERIC]->l_data[0];
 154                 _numeric[0] = *lnum->decimal_point;
 155                 _numeric[1] = *lnum->thousands_sep;
 156         }
 157
 158         if (mask & LC_CTYPE_MASK) {
 159                 struct lc_ctype *lct;
 160                 lct = loc->locdata[LC_CTYPE]->l_data[0];
 161                 for (int i = 0; i < _CACHED_RUNES; i++) {
 162                         /* ctype can only encode the lower 8 bits. */
 163                         __ctype[i+1] = lct->lc_ctype_mask[i] & 0xff;
 164                         __ctype_mask[i] = lct->lc_ctype_mask[i];
 165                 }
 166
 167                 /* The bottom half is the toupper/lower array */
 168                 for (int i = 0; i < _CACHED_RUNES; i++) {
 169                         int u, l;
 170                         __ctype[258 + i] = i;
 171                         u = lct->lc_trans_upper[i];
 172                         l = lct->lc_trans_lower[i];
 173                         if (u && u != i)
 174                                 __ctype[258+i] = u;
 175                         if (l && l != i)
 176                                 __ctype[258+i] = l;
 177
 178                         /* Don't forget these annoyances either! */
 179                         __trans_upper[i] = u;
 180                         __trans_lower[i] = l;
 181                 }
 182
 183                 /* Maximum mblen, cswidth, weird legacy */
 184                 __ctype[520] = lct->lc_max_mblen;
 185         }
 186 }