source/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 #include "lib/tdb/include/tdbutil.h"
  23 #include "system/time.h"
  24
  25 static TDB_CONTEXT *tdb;
  26
  27 /* the currently selected language */
  28 static char *current_lang;
  29
  30
  31 /* load a msg file into the tdb */
  32 static BOOL load_msg(const char *msg_file)
  33 {
  34         char **lines;
  35         int num_lines, i;
  36         char *msgid, *msgstr;
  37         TDB_DATA key, data;
  38
  39         lines = file_lines_load(msg_file, &num_lines);
  40
  41         if (!lines) {
  42                 return False;
  43         }
  44
  45         if (tdb_lockall(tdb) != 0) return False;
  46
  47         /* wipe the db */
  48         tdb_traverse(tdb, tdb_traverse_delete_fn, NULL);
  49
  50         msgid = NULL;
  51
  52         for (i=0;i<num_lines;i++) {
  53                 if (strncmp(lines[i], "msgid \"", 7) == 0) {
  54                         msgid = lines[i] + 7;
  55                 }
  56                 if (msgid && strncmp(lines[i], "msgstr \"", 8) == 0) {
  57                         msgstr = lines[i] + 8;
  58                         trim_string(msgid, NULL, "\"");
  59                         trim_string(msgstr, NULL, "\"");
  60                         if (*msgstr == 0) {
  61                                 msgstr = msgid;
  62                         }
  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         TALLOC_CTX *mem_ctx;
 105
 106         /* we only want to init once per process, unless given
 107            an override */
 108         if (initialised && !lang) return True;
 109
 110         if (initialised) {
 111                 /* we are re-initialising, free up any old init */
 112                 if (tdb) {
 113                         tdb_close(tdb);
 114                         tdb = NULL;
 115                 }
 116                 SAFE_FREE(current_lang);
 117         }
 118
 119         initialised = 1;
 120
 121         if (!lang) {
 122                 /* no lang given, use environment */
 123                 lang = get_lang();
 124         }
 125
 126         /* if no lang then we don't translate */
 127         if (!lang) return True;
 128
 129         mem_ctx = talloc_init("lang_tdb_init");
 130         if (!mem_ctx) {
 131                 return False;
 132         }
 133         asprintf(&msg_path, "%s.msg", lib_path(mem_ctx, (const char *)lang));
 134         if (stat(msg_path, &st) != 0) {
 135                 /* the msg file isn't available */
 136                 free(msg_path);
 137                 talloc_free(mem_ctx);
 138                 return False;
 139         }
 140
 141
 142         asprintf(&path, "%s%s.tdb", lock_path(mem_ctx, "lang_"), lang);
 143
 144         tdb = tdb_open(path, 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0644);
 145         if (!tdb) {
 146                 tdb = tdb_open(path, 0, TDB_DEFAULT, O_RDONLY, 0);
 147                 free(path);
 148                 free(msg_path);
 149                 talloc_free(mem_ctx);
 150                 if (!tdb) return False;
 151                 current_lang = strdup(lang);
 152                 return True;
 153         }
 154
 155         free(path);
 156         talloc_free(mem_ctx);
 157
 158         loadtime = tdb_fetch_int32(tdb, "/LOADTIME/");
 159
 160         if (loadtime == -1 || loadtime < st.st_mtime) {
 161                 load_msg(msg_path);
 162                 tdb_store_int32(tdb, "/LOADTIME/", (int)time(NULL));
 163         }
 164         free(msg_path);
 165
 166         current_lang = strdup(lang);
 167
 168         return True;
 169 }
 170
 171 /* translate a msgid to a message string in the current language
 172    returns a string that must be freed by calling lang_msg_free()
 173 */
 174 char *lang_msg(const char *msgid)
 175 {
 176         TDB_DATA key, data;
 177
 178         lang_tdb_init(NULL);
 179
 180         if (!tdb) return strdup(msgid);
 181
 182         key.dptr = strdup(msgid);
 183         key.dsize = strlen(msgid)+1;
 184
 185         data = tdb_fetch(tdb, key);
 186
 187         free(key.dptr);
 188
 189         /* if the message isn't found then we still need to return a pointer
 190            that can be freed. Pity. */
 191         if (!data.dptr)
 192                 return strdup(msgid);
 193
 194         return data.dptr;
 195 }
 196
 197
 198 /* free up a string from lang_msg() */
 199 void lang_msg_free(char *msgstr)
 200 {
 201         free(msgstr);
 202 }
 203
 204
 205 /*
 206   when the _() translation macro is used there is no obvious place to free
 207   the resulting string and there is no easy way to give a static pointer.
 208   All we can do is rotate between some static buffers and hope a single d_printf()
 209   doesn't have more calls to _() than the number of buffers
 210 */
 211 const char *lang_msg_rotate(const char *msgid)
 212 {
 213 #define NUM_LANG_BUFS 4
 214         const char *msgstr;
 215         static pstring bufs[NUM_LANG_BUFS];
 216         static int next;
 217
 218         msgstr = lang_msg(msgid);
 219         if (!msgstr) return msgid;
 220
 221         pstrcpy(bufs[next], msgstr);
 222         msgstr = bufs[next];
 223
 224         next = (next+1) % NUM_LANG_BUFS;
 225
 226         return msgstr;
 227 }
 228
 229
 230 /*
 231    return the current language - needed for language file mappings
 232 */
 233 char *lang_tdb_current(void)
 234 {
 235         return current_lang;
 236 }