git.maemo.org Git - navit-package/blob - navit/plugin.c

   1 /**
   2  * Navit, a modular navigation system.
   3  * Copyright (C) 2005-2008 Navit Team
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * version 2 as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the
  16  * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  * Boston, MA  02110-1301, USA.
  18  */
  19
  20 #include <string.h>
  21 #include <glib.h>
  22 #include "config.h"
  23 #ifdef USE_PLUGINS
  24 #include <gmodule.h>
  25 #endif
  26 #include "plugin.h"
  27 #include "file.h"
  28 #define PLUGIN_C
  29 #include "plugin.h"
  30 #include "item.h"
  31 #include "debug.h"
  32
  33 struct plugin {
  34         int active;
  35         int lazy;
  36         int ondemand;
  37         char *name;
  38 #ifdef USE_PLUGINS
  39         GModule *mod;
  40 #endif
  41         void (*init)(void);
  42 };
  43
  44 struct plugins {
  45         GHashTable *hash;
  46         GList *list;
  47 } *pls;
  48
  49 struct plugin *
  50 plugin_new(char *plugin)
  51 {
  52 #ifdef USE_PLUGINS
  53         struct plugin *ret;
  54         if (! g_module_supported()) {
  55                 return NULL;
  56         }
  57         ret=g_new0(struct plugin, 1);
  58         ret->name=g_strdup(plugin);
  59         return ret;
  60 #else
  61         return NULL;
  62 #endif
  63 }
  64
  65 int
  66 plugin_load(struct plugin *pl)
  67 {
  68 #ifdef USE_PLUGINS
  69         gpointer init;
  70
  71         GModule *mod;
  72
  73         if (pl->mod) {
  74                 dbg(0,"can't load '%s', already loaded\n", pl->name);
  75                 return 0;
  76         }
  77         mod=g_module_open(pl->name, G_MODULE_BIND_LOCAL | (pl->lazy ? G_MODULE_BIND_LAZY : 0));
  78         if (! mod) {
  79                 dbg(0,"can't load '%s', Error '%s'\n", pl->name, g_module_error());
  80                 return 0;
  81         }
  82         if (!g_module_symbol(mod, "plugin_init", &init)) {
  83                 dbg(0,"can't load '%s', plugin_init not found\n", pl->name);
  84                 g_module_close(mod);
  85                 return 0;
  86         } else {
  87                 pl->mod=mod;
  88                 pl->init=init;
  89         }
  90         return 1;
  91 #else
  92         return 0;
  93 #endif
  94 }
  95
  96 char *
  97 plugin_get_name(struct plugin *pl)
  98 {
  99         return pl->name;
 100 }
 101
 102 int
 103 plugin_get_active(struct plugin *pl)
 104 {
 105         return pl->active;
 106 }
 107
 108 void
 109 plugin_set_active(struct plugin *pl, int active)
 110 {
 111         pl->active=active;
 112 }
 113
 114 void
 115 plugin_set_lazy(struct plugin *pl, int lazy)
 116 {
 117         pl->lazy=lazy;
 118 }
 119
 120 #ifdef USE_PLUGINS
 121 static int
 122 plugin_get_ondemand(struct plugin *pl)
 123 {
 124         return pl->ondemand;
 125 }
 126 #endif
 127
 128 static void
 129 plugin_set_ondemand(struct plugin *pl, int ondemand)
 130 {
 131         pl->ondemand=ondemand;
 132 }
 133
 134 void
 135 plugin_call_init(struct plugin *pl)
 136 {
 137         pl->init();
 138 }
 139
 140 void
 141 plugin_unload(struct plugin *pl)
 142 {
 143 #ifdef USE_PLUGINS
 144         g_module_close(pl->mod);
 145         pl->mod=NULL;
 146 #endif
 147 }
 148
 149 void
 150 plugin_destroy(struct plugin *pl)
 151 {
 152         g_free(pl);
 153 }
 154
 155 struct plugins *
 156 plugins_new(void)
 157 {
 158         struct plugins *ret=g_new0(struct plugins, 1);
 159         ret->hash=g_hash_table_new(g_str_hash, g_str_equal);
 160         pls=ret;
 161         return ret;
 162 }
 163
 164 void
 165 plugins_add_path(struct plugins *pls, struct attr **attrs) {
 166         struct attr *path_attr, *attr;
 167         struct file_wordexp *we;
 168         int active=1; // default active
 169         int lazy=0, ondemand=0;
 170         int i, count;
 171         char **array;
 172         char *name;
 173         struct plugin *pl;
 174
 175         if (! (path_attr=attr_search(attrs, NULL, attr_path))) {
 176                 dbg(0,"missing path\n");
 177                 return;
 178         }
 179         if ( (attr=attr_search(attrs, NULL, attr_active))) {
 180                 active=attr->u.num;
 181         }
 182         if ( (attr=attr_search(attrs, NULL, attr_lazy))) {
 183                 lazy=attr->u.num;
 184         }
 185         if ( (attr=attr_search(attrs, NULL, attr_ondemand))) {
 186                 ondemand=attr->u.num;
 187         }
 188         dbg(1, "path=\"%s\", active=%d, lazy=%d, ondemand=%d\n",path_attr->u.str, active, lazy, ondemand);
 189
 190         we=file_wordexp_new(path_attr->u.str);
 191         count=file_wordexp_get_count(we);
 192         array=file_wordexp_get_array(we);
 193         for (i = 0 ; i < count ; i++) {
 194                 name=array[i];
 195                 if (! (pl=g_hash_table_lookup(pls->hash, name))) {
 196                         pl=plugin_new(name);
 197                         if (! pl) {
 198                                 dbg(0,"failed to create plugin '%s'\n", name);
 199                                 continue;
 200                         }
 201                         g_hash_table_insert(pls->hash, plugin_get_name(pl), pl);
 202                         pls->list=g_list_append(pls->list, pl);
 203                 } else {
 204                         pls->list=g_list_remove(pls->list, pl);
 205                         pls->list=g_list_append(pls->list, pl);
 206                 }
 207                 plugin_set_active(pl, active);
 208                 plugin_set_lazy(pl, lazy);
 209                 plugin_set_ondemand(pl, ondemand);
 210         }
 211         file_wordexp_destroy(we);
 212 }
 213
 214 void
 215 plugins_init(struct plugins *pls)
 216 {
 217 #ifdef USE_PLUGINS
 218         struct plugin *pl;
 219         GList *l;
 220
 221         l=pls->list;
 222         while (l) {
 223                 pl=l->data;
 224                 if (! plugin_get_ondemand(pl)) {
 225                         if (plugin_get_active(pl))
 226                                 if (!plugin_load(pl))
 227                                         plugin_set_active(pl, 0);
 228                         if (plugin_get_active(pl))
 229                                 plugin_call_init(pl);
 230                 }
 231                 l=g_list_next(l);
 232         }
 233 #endif
 234 }
 235
 236 void
 237 plugins_destroy(struct plugins *pls)
 238 {
 239         GList *l;
 240         struct plugin *pl;
 241
 242         l=pls->list;
 243         while (l) {
 244                 pl=l->data;
 245                 plugin_unload(pl);
 246                 plugin_destroy(pl);
 247         }
 248         g_list_free(pls->list);
 249         g_hash_table_destroy(pls->hash);
 250         g_free(pls);
 251 }
 252
 253         void *
 254 plugin_get_type(enum plugin_type type, const char *type_name, const char *name)
 255 {
 256         dbg(1, "type=\"%s\", name=\"%s\"\n", type_name, name);
 257         GList *l,*lpls;
 258         struct name_val *nv;
 259         struct plugin *pl;
 260         char *mod_name, *filename=NULL, *corename=NULL;
 261         l=plugin_types[type];
 262         while (l) {
 263                 nv=l->data;
 264                 if (!g_ascii_strcasecmp(nv->name, name))
 265                         return nv->val;
 266                 l=g_list_next(l);
 267         }
 268         lpls=pls->list;
 269         if(!g_ascii_strcasecmp(type_name, "map"))
 270                 type_name="data";
 271         filename=g_strjoin("", "lib", type_name, "_", name, NULL);
 272         corename=g_strjoin("", "lib", type_name, "_", "core", NULL);
 273         while (lpls) {
 274                 pl=lpls->data;
 275                 if ((mod_name=g_strrstr(pl->name, "/")))
 276                         mod_name++;
 277                 else
 278                         mod_name=pl->name;
 279                 if (!g_ascii_strncasecmp(mod_name, filename, strlen(filename)) || !g_ascii_strncasecmp(mod_name, corename, strlen(filename))) {
 280                         dbg(0, "Loading module \"%s\"\n",pl->name) ;
 281                         if (plugin_get_active(pl))
 282                                 if (!plugin_load(pl))
 283                                         plugin_set_active(pl, 0);
 284                         if (plugin_get_active(pl))
 285                                 plugin_call_init(pl);
 286                         l=plugin_types[type];
 287                         while (l) {
 288                                 nv=l->data;
 289                                 if (!g_ascii_strcasecmp(nv->name, name)) {
 290                                         g_free(filename);
 291                                         g_free(corename);
 292                                         return nv->val;
 293                                 }
 294                                 l=g_list_next(l);
 295                         }
 296                 }
 297                 lpls=g_list_next(lpls);
 298         }
 299         g_free(filename);
 300         g_free(corename);
 301         return NULL;
 302 }