lib/libc/nls/catopen.c

   1 /*      $NetBSD: catopen.c,v 1.27 2009/01/11 02:46:29 christos Exp $    */
   2
   3 /*-
   4  * Copyright (c) 1996 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by J.T. Conklin.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 __RCSID("$NetBSD: catopen.c,v 1.27 2009/01/11 02:46:29 christos Exp $");
  35 #endif /* LIBC_SCCS and not lint */
  36
  37 #define _NLS_PRIVATE
  38
  39 #include "namespace.h"
  40 #include <sys/param.h>
  41 #include <sys/stat.h>
  42 #include <sys/mman.h>
  43
  44 #include <assert.h>
  45 #include <fcntl.h>
  46 #include <limits.h>
  47 #include <locale.h>
  48 #include <nl_types.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51 #include <unistd.h>
  52
  53 #ifdef HAVE_CITRUS
  54 #include "citrus_namespace.h"
  55 #include "citrus_bcs.h"
  56 #include "citrus_region.h"
  57 #include "citrus_lookup.h"
  58 #include "citrus_aliasname_local.h"
  59 #else
  60 #include "aliasname_local.h"
  61 #endif
  62
  63 #define NLS_ALIAS_DB "/usr/share/nls/nls.alias"
  64
  65 #define NLS_DEFAULT_PATH "/usr/share/nls/%L/%N.cat:/usr/share/nls/%N/%L"
  66 #define NLS_DEFAULT_LANG "C"
  67
  68 #ifdef __weak_alias
  69 __weak_alias(catopen, _catopen)
  70 #endif
  71
  72 static nl_catd load_msgcat __P((const char *));
  73
  74 nl_catd
  75 _catopen(name, oflag)
  76         const char *name;
  77         int oflag;
  78 {
  79         char tmppath[PATH_MAX+1];
  80         const char *nlspath;
  81         const char *lang, *reallang;
  82         char *t;
  83         const char *s, *u;
  84         nl_catd catd;
  85         char langbuf[PATH_MAX];
  86
  87         if (name == NULL || *name == '\0')
  88                 return (nl_catd)-1;
  89
  90         /* absolute or relative path? */
  91         if (strchr(name, '/'))
  92                 return load_msgcat(name);
  93
  94         if (issetugid() || (nlspath = getenv("NLSPATH")) == NULL)
  95                 nlspath = NLS_DEFAULT_PATH;
  96         if (oflag == NL_CAT_LOCALE) {
  97                 lang = setlocale(LC_MESSAGES, NULL);
  98         }
  99         else {
 100                 lang = getenv("LANG");
 101         }
 102         if (lang == NULL || strchr(lang, '/'))
 103                 lang = NLS_DEFAULT_LANG;
 104
 105         reallang = __unaliasname(NLS_ALIAS_DB, lang, langbuf, sizeof(langbuf));
 106         if (reallang == NULL)
 107                 reallang = lang;
 108
 109         s = nlspath;
 110         t = tmppath;
 111         do {
 112                 while (*s && *s != ':') {
 113                         if (*s == '%') {
 114                                 switch (*(++s)) {
 115                                 case 'L':       /* locale */
 116                                         u = reallang;
 117                                         while (*u && t < tmppath + PATH_MAX)
 118                                                 *t++ = *u++;
 119                                         break;
 120                                 case 'N':       /* name */
 121                                         u = name;
 122                                         while (*u && t < tmppath + PATH_MAX)
 123                                                 *t++ = *u++;
 124                                         break;
 125                                 case 'l':       /* lang */
 126                                 case 't':       /* territory */
 127                                 case 'c':       /* codeset */
 128                                         break;
 129                                 default:
 130                                         if (t < tmppath + PATH_MAX)
 131                                                 *t++ = *s;
 132                                 }
 133                         } else {
 134                                 if (t < tmppath + PATH_MAX)
 135                                         *t++ = *s;
 136                         }
 137                         s++;
 138                 }
 139
 140                 *t = '\0';
 141                 catd = load_msgcat(tmppath);
 142                 if (catd != (nl_catd)-1)
 143                         return catd;
 144
 145                 if (*s)
 146                         s++;
 147                 t = tmppath;
 148         } while (*s);
 149
 150         return (nl_catd)-1;
 151 }
 152
 153 static nl_catd
 154 load_msgcat(path)
 155         const char *path;
 156 {
 157         struct stat st;
 158         nl_catd catd;
 159         void *data;
 160         int fd;
 161
 162         _DIAGASSERT(path != NULL);
 163
 164         if ((fd = open(path, O_RDONLY)) == -1)
 165                 return (nl_catd)-1;
 166
 167         if (fstat(fd, &st) != 0) {
 168                 close (fd);
 169                 return (nl_catd)-1;
 170         }
 171
 172         data = mmap(0, (size_t)st.st_size, PROT_READ, MAP_FILE|MAP_SHARED, fd,
 173             (off_t)0);
 174         close (fd);
 175
 176         if (data == MAP_FAILED) {
 177                 return (nl_catd)-1;
 178         }
 179
 180         if (ntohl((u_int32_t)((struct _nls_cat_hdr *)data)->__magic) !=
 181             _NLS_MAGIC) {
 182                 munmap(data, (size_t)st.st_size);
 183                 return (nl_catd)-1;
 184         }
 185
 186         if ((catd = malloc(sizeof (*catd))) == NULL) {
 187                 munmap(data, (size_t)st.st_size);
 188                 return (nl_catd)-1;
 189         }
 190
 191         catd->__data = data;
 192         catd->__size = (int)st.st_size;
 193         return catd;
 194 }