locale/FreeBSD/setrunelocale.c

   1 /*-
   2  * Copyright (c) 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Paul Borman at Krystal Technologies.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36
  37 #include <sys/cdefs.h>
  38 __FBSDID("$FreeBSD: src/lib/libc/locale/setrunelocale.c,v 1.26 2002/10/10 22:56:18 tjr Exp $");
  39
  40 #include <rune.h>
  41 #include <errno.h>
  42 #include <limits.h>
  43 #include <string.h>
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <unistd.h>
  47 #include "setlocale.h"
  48
  49 extern int              _none_init(_RuneLocale *);
  50 extern int              _UTF2_init(_RuneLocale *);
  51 extern int              _UTF8_init(_RuneLocale *);
  52 extern int              _EUC_init(_RuneLocale *);
  53 extern int              _BIG5_init(_RuneLocale *);
  54 extern int              _MSKanji_init(_RuneLocale *);
  55 extern _RuneLocale      *_Read_RuneMagi(FILE *);
  56
  57 int
  58 setrunelocale(char *encoding)
  59 {
  60         FILE *fp;
  61         char name[PATH_MAX];
  62         _RuneLocale *rl;
  63         int saverr, ret;
  64         static char ctype_encoding[ENCODING_LEN + 1];
  65         static _RuneLocale *CachedRuneLocale;
  66         static int Cached__mb_cur_max;
  67
  68         if (!encoding || !*encoding || strlen(encoding) > ENCODING_LEN ||
  69             (encoding[0] == '.' &&
  70              (encoding[1] == '\0' ||
  71               (encoding[1] == '.' && encoding[2] == '\0'))) ||
  72             strchr(encoding, '/') != NULL)
  73                 return (EINVAL);
  74
  75         /*
  76          * The "C" and "POSIX" locale are always here.
  77          */
  78         if (strcmp(encoding, "C") == 0 || strcmp(encoding, "POSIX") == 0) {
  79                 _CurrentRuneLocale = &_DefaultRuneLocale;
  80                 __mb_cur_max = 1;
  81                 return (0);
  82         }
  83
  84         /*
  85          * If the locale name is the same as our cache, use the cache.
  86          */
  87         if (CachedRuneLocale != NULL &&
  88             strcmp(encoding, ctype_encoding) == 0) {
  89                 _CurrentRuneLocale = CachedRuneLocale;
  90                 __mb_cur_max = Cached__mb_cur_max;
  91                 return (0);
  92         }
  93
  94         /*
  95          * Slurp the locale file into the cache.
  96          */
  97         if (_PathLocale == NULL) {
  98                 char *p = getenv("PATH_LOCALE");
  99
 100                 if (p != NULL
 101 #ifndef __NETBSD_SYSCALLS
 102                         && !issetugid()
 103 #endif
 104                         ) {
 105                         if (strlen(p) + 1/*"/"*/ + ENCODING_LEN +
 106                             1/*"/"*/ + CATEGORY_LEN >= PATH_MAX)
 107                                 return (ENAMETOOLONG);
 108                         _PathLocale = strdup(p);
 109                         if (_PathLocale == NULL)
 110                                 return (errno == 0 ? ENOMEM : errno);
 111                 } else
 112                         _PathLocale = _PATH_LOCALE;
 113         }
 114         /* Range checking not needed, encoding length already checked above */
 115         (void) strcpy(name, _PathLocale);
 116         (void) strcat(name, "/");
 117         (void) strcat(name, encoding);
 118         (void) strcat(name, "/LC_CTYPE");
 119
 120         if ((fp = fopen(name, "r")) == NULL)
 121                 return (errno == 0 ? ENOENT : errno);
 122
 123         if ((rl = _Read_RuneMagi(fp)) == NULL) {
 124                 saverr = (errno == 0 ? EFTYPE : errno);
 125                 (void)fclose(fp);
 126                 return (saverr);
 127         }
 128         (void)fclose(fp);
 129
 130         if (strcmp(rl->encoding, "NONE") == 0)
 131                 ret = _none_init(rl);
 132         else if (strcmp(rl->encoding, "UTF2") == 0)
 133                 ret = _UTF2_init(rl);
 134         else if (strcmp(rl->encoding, "UTF-8") == 0)
 135                 ret = _UTF8_init(rl);
 136         else if (strcmp(rl->encoding, "EUC") == 0)
 137                 ret = _EUC_init(rl);
 138         else if (strcmp(rl->encoding, "BIG5") == 0)
 139                 ret = _BIG5_init(rl);
 140         else if (strcmp(rl->encoding, "MSKanji") == 0)
 141                 ret = _MSKanji_init(rl);
 142         else
 143                 ret = EFTYPE;
 144         if (ret == 0) {
 145                 if (CachedRuneLocale != NULL) {
 146                         /* See euc.c */
 147                         if (strcmp(CachedRuneLocale->encoding, "EUC") == 0)
 148                                 free(CachedRuneLocale->variable);
 149                         free(CachedRuneLocale);
 150                 }
 151                 CachedRuneLocale = _CurrentRuneLocale;
 152                 Cached__mb_cur_max = __mb_cur_max;
 153                 (void)strcpy(ctype_encoding, encoding);
 154         } else
 155                 free(rl);
 156
 157         return (ret);
 158 }
 159