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 "collate.h"
  47 #include "lnumeric.h"   /* for struct lc_numeric */
  48 #include "lctype.h"     /* for struct lc_ctype */
  49 #include "setlocale.h"
  50 #include "../i18n/_loc_path.h"
  51 #include "localeimpl.h"
  52 #include "../i18n/_locale.h"
  53 
  54 /*
  55  * Path to locale storage directory.  See ../i18n/_loc_path.h
  56  */
  57 char    *_PathLocale = _DFLT_LOC_PATH;
  58 
  59 static char     *current_locale(locale_t, int);
  60 static void     install_legacy(locale_t, int);
  61 
  62 char *
  63 setlocale(int category, const char *locname)
  64 {
  65         locale_t oldloc;
  66         locale_t newloc;
  67         int mask;
  68 
  69         if (category < 0 || category > LC_ALL) {
  70                 errno = EINVAL;
  71                 return (NULL);
  72         }
  73 
  74         if (locname == NULL)
  75                 return (current_locale(___global_locale, category));
  76 
  77         if ((oldloc = duplocale(___global_locale)) == NULL)
  78                 return (NULL);
  79 
  80         mask = (category == LC_ALL ? LC_ALL_MASK : (1 << category));
  81 
  82         newloc = newlocale(mask, locname, oldloc);
  83         if (newloc == NULL) {
  84                 freelocale(oldloc);
  85                 return (NULL);
  86         }
  87 
  88         oldloc = ___global_locale;
  89         ___global_locale = newloc;
  90 
  91         install_legacy(newloc, mask);
  92 
  93         freelocale(oldloc);
  94         return (current_locale(newloc, category));
  95 }
  96 
  97 static char *
  98 current_locale(locale_t loc, int cat)
  99 {
 100         int composite = 0;
 101         static char buf[LC_ALL * (ENCODING_LEN + 1 + 1)];
 102 
 103         if (cat != LC_ALL) {
 104                 return (loc->locdata[cat]->l_lname);
 105         }
 106 
 107         /* Look to see if any category is different */
 108         for (int i = 1; i < LC_ALL; ++i) {
 109                 if (strcmp(loc->locdata[0]->l_lname,
 110                     loc->locdata[i]->l_lname) != 0) {
 111                         composite = 1;
 112                         break;
 113                 }
 114         }
 115 
 116         if (composite) {
 117                 /*
 118                  * Note ordering of these follows the numeric order,
 119                  * if the order is changed, then setlocale() will need
 120                  * to be changed as well.
 121                  */
 122                 (void) snprintf(buf, sizeof (buf),
 123                     "%s/%s/%s/%s/%s/%s",
 124                     loc->locdata[LC_CTYPE]->l_lname,
 125                     loc->locdata[LC_NUMERIC]->l_lname,
 126                     loc->locdata[LC_TIME]->l_lname,
 127                     loc->locdata[LC_COLLATE]->l_lname,
 128                     loc->locdata[LC_MONETARY]->l_lname,
 129                     loc->locdata[LC_MESSAGES]->l_lname);
 130                 return (buf);
 131         }
 132 
 133         return (loc->locdata[0]->l_lname);
 134 }
 135 
 136 static void
 137 install_legacy(locale_t loc, int mask)
 138 {
 139         /*
 140          * Update the legacy fixed variables that may be baked into
 141          * legacy programs.  This is really unfortunate, but we can't
 142          * solve for them otherwise.  Note that such legacy programs
 143          * are only going to see the global locale settings, and cannot
 144          * benefit from uselocale().
 145          */
 146         if (mask & LC_NUMERIC_MASK) {
 147                 struct lc_numeric *lnum;
 148                 lnum = loc->locdata[LC_NUMERIC]->l_data[0];
 149                 _numeric[0] = *lnum->decimal_point;
 150                 _numeric[1] = *lnum->thousands_sep;
 151         }
 152 
 153         if (mask & LC_CTYPE_MASK) {
 154                 struct lc_ctype *lct;
 155                 lct = loc->locdata[LC_CTYPE]->l_data[0];
 156                 for (int i = 0; i < _CACHED_RUNES; i++) {
 157                         /* ctype can only encode the lower 8 bits. */
 158                         __ctype[i+1] = lct->lc_ctype_mask[i] & 0xff;
 159                         __ctype_mask[i] = lct->lc_ctype_mask[i];
 160                 }
 161 
 162                 /* The bottom half is the toupper/lower array */
 163                 for (int i = 0; i < _CACHED_RUNES; i++) {
 164                         int u, l;
 165                         __ctype[258 + i] = i;
 166                         u = lct->lc_trans_upper[i];
 167                         l = lct->lc_trans_lower[i];
 168                         if (u && u != i)
 169                                 __ctype[258+i] = u;
 170                         if (l && l != i)
 171                                 __ctype[258+i] = l;
 172 
 173                         /* Don't forget these annoyances either! */
 174                         __trans_upper[i] = u;
 175                         __trans_lower[i] = l;
 176                 }
 177 
 178                 /* Maximum mblen, cswidth, weird legacy */
 179                 __ctype[520] = lct->lc_max_mblen;
 180         }
 181 }