source3/intl/lang_tdb.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    tdb based replacement for gettext
   4    Copyright (C) Andrew Tridgell 2001
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include "includes.h"
  22
  23 static TDB_CONTEXT *tdb;
  24
  25 /* the currently selected language */
  26 static char *current_lang;
  27
  28
  29 /* load a msg file into the tdb */
  30 static BOOL load_msg(const char *msg_file)
  31 {
  32         char **lines;
  33         int num_lines, i;
  34         char *msgid, *msgstr;
  35         TDB_DATA key, data;
  36
  37         lines = file_lines_load(msg_file, &num_lines);
  38
  39         if (!lines) {
  40                 return False;
  41         }
  42
  43         if (tdb_lockall(tdb) != 0) return False;
  44
  45         /* wipe the db */
  46         tdb_traverse(tdb, tdb_traverse_delete_fn, NULL);
  47
  48         msgid = NULL;
  49
  50         for (i=0;i<num_lines;i++) {
  51                 if (strncmp(lines[i], "msgid \"", 7) == 0) {
  52                         msgid = lines[i] + 7;
  53                 }
  54                 if (msgid && strncmp(lines[i], "msgstr \"", 8) == 0) {
  55                         msgstr = lines[i] + 8;
  56                         trim_char(msgid, '\0', '\"');
  57                         trim_char(msgstr, '\0', '\"');
  58                         if (*msgstr == 0) {
  59                                 msgstr = msgid;
  60                         }
  61                         all_string_sub(msgid, "\\n", "\n", 0);
  62                         all_string_sub(msgstr, "\\n", "\n", 0);
  63                         key.dptr = msgid;
  64                         key.dsize = strlen(msgid)+1;
  65                         data.dptr = msgstr;
  66                         data.dsize = strlen(msgstr)+1;
  67                         tdb_store(tdb, key, data, 0);
  68                         msgid = NULL;
  69                 }
  70         }
  71
  72         file_lines_free(lines);
  73         tdb_unlockall(tdb);
  74
  75         return True;
  76 }
  77
  78
  79 /* work out what language to use from locale variables */
  80 static const char *get_lang(void)
  81 {
  82         const char *vars[] = {"LANGUAGE", "LC_ALL", "LC_LANG", "LANG", NULL};
  83         int i;
  84         char *p;
  85
  86         for (i=0; vars[i]; i++) {
  87                 if ((p = getenv(vars[i]))) {
  88                         return p;
  89                 }
  90         }
  91
  92         return NULL;
  93 }
  94
  95 /* initialise the message translation subsystem. If the "lang" argument
  96    is NULL then get the language from the normal environment variables */
  97 BOOL lang_tdb_init(const char *lang)
  98 {
  99         char *path = NULL;
 100         char *msg_path = NULL;
 101         struct stat st;
 102         static int initialised;
 103         time_t loadtime;
 104         BOOL result = False;
 105
 106         /* we only want to init once per process, unless given
 107            an override */
 108         if (initialised && !lang)
 109                 return True;
 110
 111         if (initialised) {
 112                 /* we are re-initialising, free up any old init */
 113                 if (tdb) {
 114                         tdb_close(tdb);
 115                         tdb = NULL;
 116                 }
 117                 SAFE_FREE(current_lang);
 118         }
 119
 120         initialised = 1;
 121
 122         if (!lang) {
 123                 /* no lang given, use environment */
 124                 lang = get_lang();
 125         }
 126
 127         /* if no lang then we don't translate */
 128         if (!lang)
 129                 return True;
 130
 131         asprintf(&msg_path, "%s.msg", lib_path((const char *)lang));
 132         if (stat(msg_path, &st) != 0) {
 133                 /* the msg file isn't available */
 134                 DEBUG(10, ("lang_tdb_init: %s: %s\n", msg_path,
 135                            strerror(errno)));
 136                 goto done;
 137         }
 138
 139         asprintf(&path, "%s%s.tdb", lock_path("lang_"), lang);
 140
 141         DEBUG(10, ("lang_tdb_init: loading %s\n", path));
 142
 143         tdb = tdb_open_log(path, 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0644);
 144         if (!tdb) {
 145                 tdb = tdb_open_log(path, 0, TDB_DEFAULT, O_RDONLY, 0);
 146                 if (!tdb) {
 147                         DEBUG(10, ("lang_tdb_init: %s: %s\n", path,
 148                                    strerror(errno)));
 149                         goto done;
 150                 }
 151                 current_lang = strdup(lang);
 152                 result = True;
 153                 goto done;
 154         }
 155
 156         loadtime = tdb_fetch_int32(tdb, "/LOADTIME/");
 157
 158         if (loadtime == -1 || loadtime < st.st_mtime) {
 159                 load_msg(msg_path);
 160                 tdb_store_int32(tdb, "/LOADTIME/", (int)time(NULL));
 161         }
 162
 163         current_lang = strdup(lang);
 164         result = True;
 165
 166  done:
 167         SAFE_FREE(msg_path);
 168         SAFE_FREE(path);
 169
 170         return result;
 171 }
 172
 173 /* translate a msgid to a message string in the current language
 174    returns a string that must be freed by calling lang_msg_free()
 175 */
 176 const char *lang_msg(const char *msgid)
 177 {
 178         TDB_DATA key, data;
 179         const char *p;
 180         char *q, *msgid_quoted;
 181         int count;
 182
 183         lang_tdb_init(NULL);
 184
 185         if (!tdb) return msgid;
 186
 187         /* Due to the way quotes in msgids are escaped in the msg file we
 188            must replace " with \" before doing a lookup in the tdb. */
 189
 190         count = 0;
 191
 192         for(p = msgid; *p; p++) {
 193                 if (*p == '\"')
 194                         count++;
 195         }
 196
 197         if (!(msgid_quoted = malloc(strlen(msgid) + count + 1)))
 198                 return msgid;
 199
 200         /* string_sub() is unsuitable here as it replaces some punctuation
 201            chars with underscores. */
 202
 203         for(p = msgid, q = msgid_quoted; *p; p++) {
 204                 if (*p == '\"') {
 205                         *q = '\\';
 206                         q++;
 207                 }
 208                 *q = *p;
 209                 q++;
 210         }
 211
 212         *q = 0;
 213
 214         key.dptr = (char *)msgid_quoted;
 215         key.dsize = strlen(msgid_quoted)+1;
 216
 217         data = tdb_fetch(tdb, key);
 218
 219         free(msgid_quoted);
 220
 221         /* if the message isn't found then we still need to return a pointer
 222            that can be freed. Pity. */
 223         if (!data.dptr)
 224                 return strdup(msgid);
 225
 226         return (const char *)data.dptr;
 227 }
 228
 229
 230 /* free up a string from lang_msg() */
 231 void lang_msg_free(const char *msgstr)
 232 {
 233         if (!tdb) return;
 234         free((void *)msgstr);
 235 }
 236
 237
 238 /*
 239   when the _() translation macro is used there is no obvious place to free
 240   the resulting string and there is no easy way to give a static pointer.
 241   All we can do is rotate between some static buffers and hope a single d_printf()
 242   doesn't have more calls to _() than the number of buffers
 243 */
 244 const char *lang_msg_rotate(const char *msgid)
 245 {
 246 #define NUM_LANG_BUFS 16
 247         char *msgstr;
 248         static pstring bufs[NUM_LANG_BUFS];
 249         static int next;
 250
 251         msgstr = (char *)lang_msg(msgid);
 252         if (!msgstr) return msgid;
 253
 254         pstrcpy(bufs[next], msgstr);
 255         msgstr = bufs[next];
 256
 257         next = (next+1) % NUM_LANG_BUFS;
 258
 259         return msgstr;
 260 }
 261
 262
 263 /*
 264    return the current language - needed for language file mappings
 265 */
 266 char *lang_tdb_current(void)
 267 {
 268         return current_lang;
 269 }