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 <gmodule.h>
  23 #include "config.h"
  24 #include "plugin.h"
  25 #include "file.h"
  26 #define PLUGIN_C
  27 #include "plugin.h"
  28 #include "item.h"
  29 #include "debug.h"
  30
  31 struct plugin {
  32         int active;
  33         int lazy;
  34         int ondemand;
  35         char *name;
  36         GModule *mod;
  37         void (*init)(void);
  38 };
  39
  40 struct plugins {
  41         GHashTable *hash;
  42         GList *list;
  43 } *pls;
  44
  45 struct plugin *
  46 plugin_new(char *plugin)
  47 {
  48         struct plugin *ret;
  49         if (! g_module_supported()) {
  50                 return NULL;
  51         }
  52         ret=g_new0(struct plugin, 1);
  53         ret->name=g_strdup(plugin);
  54         return ret;
  55
  56 }
  57
  58 int
  59 plugin_load(struct plugin *pl)
  60 {
  61         gpointer init;
  62
  63         GModule *mod;
  64
  65         if (pl->mod) {
  66                 g_warning("can't load '%s', already loaded\n", pl->name);
  67                 return 0;
  68         }
  69         mod=g_module_open(pl->name, G_MODULE_BIND_LOCAL | (pl->lazy ? G_MODULE_BIND_LAZY : 0));
  70         if (! mod) {
  71                 g_warning("can't load '%s', Error '%s'\n", pl->name, g_module_error());
  72                 return 0;
  73         }
  74         if (!g_module_symbol(mod, "plugin_init", &init)) {
  75                 g_warning("can't load '%s', plugin_init not found\n", pl->name);
  76                 g_module_close(mod);
  77                 return 0;
  78         } else {
  79                 pl->mod=mod;
  80                 pl->init=init;
  81         }
  82         return 1;
  83 }
  84
  85 char *
  86 plugin_get_name(struct plugin *pl)
  87 {
  88         return pl->name;
  89 }
  90
  91 int
  92 plugin_get_active(struct plugin *pl)
  93 {
  94         return pl->active;
  95 }
  96
  97 void
  98 plugin_set_active(struct plugin *pl, int active)
  99 {
 100         pl->active=active;
 101 }
 102
 103 void
 104 plugin_set_lazy(struct plugin *pl, int lazy)
 105 {
 106         pl->lazy=lazy;
 107 }
 108
 109 static int
 110 plugin_get_ondemand(struct plugin *pl)
 111 {
 112         return pl->ondemand;
 113 }
 114
 115 static void
 116 plugin_set_ondemand(struct plugin *pl, int ondemand)
 117 {
 118         pl->ondemand=ondemand;
 119 }
 120
 121 void
 122 plugin_call_init(struct plugin *pl)
 123 {
 124         pl->init();
 125 }
 126
 127 void
 128 plugin_unload(struct plugin *pl)
 129 {
 130         g_module_close(pl->mod);
 131         pl->mod=NULL;
 132 }
 133
 134 void
 135 plugin_destroy(struct plugin *pl)
 136 {
 137         g_free(pl);
 138 }
 139
 140 struct plugins *
 141 plugins_new(void)
 142 {
 143         struct plugins *ret=g_new0(struct plugins, 1);
 144         ret->hash=g_hash_table_new(g_str_hash, g_str_equal);
 145         pls=ret;
 146         return ret;
 147 }
 148
 149 void
 150 plugins_add_path(struct plugins *pls, struct attr **attrs) {
 151         struct attr *path_attr, *attr;
 152         struct file_wordexp *we;
 153         int active=1; // default active
 154         int lazy=0, ondemand=0;
 155         int i, count;
 156         char **array;
 157         char *name;
 158         struct plugin *pl;
 159
 160         if (! (path_attr=attr_search(attrs, NULL, attr_path))) {
 161                 dbg(0,"missing path\n");
 162                 return;
 163         }
 164         if ( (attr=attr_search(attrs, NULL, attr_active))) {
 165                 active=attr->u.num;
 166         }
 167         if ( (attr=attr_search(attrs, NULL, attr_lazy))) {
 168                 lazy=attr->u.num;
 169         }
 170         if ( (attr=attr_search(attrs, NULL, attr_ondemand))) {
 171                 ondemand=attr->u.num;
 172         }
 173         dbg(1, "path=\"%s\", active=%d, lazy=%d, ondemand=%d\n",path_attr->u.str, active, lazy, ondemand);
 174
 175         we=file_wordexp_new(path_attr->u.str);
 176         count=file_wordexp_get_count(we);
 177         array=file_wordexp_get_array(we);
 178         for (i = 0 ; i < count ; i++) {
 179                 name=array[i];
 180                 if (! (pl=g_hash_table_lookup(pls->hash, name))) {
 181                         pl=plugin_new(name);
 182                         if (! pl) {
 183                                 g_warning("failed to create plugin '%s'\n", name);
 184                                 continue;
 185                         }
 186                         g_hash_table_insert(pls->hash, plugin_get_name(pl), pl);
 187                         pls->list=g_list_append(pls->list, pl);
 188                 } else {
 189                         pls->list=g_list_remove(pls->list, pl);
 190                         pls->list=g_list_append(pls->list, pl);
 191                 }
 192                 plugin_set_active(pl, active);
 193                 plugin_set_lazy(pl, lazy);
 194                 plugin_set_ondemand(pl, ondemand);
 195         }
 196         file_wordexp_destroy(we);
 197 }
 198
 199 void
 200 plugins_init(struct plugins *pls)
 201 {
 202 #ifdef USE_PLUGINS
 203         struct plugin *pl;
 204         GList *l;
 205
 206         l=pls->list;
 207         while (l) {
 208                 pl=l->data;
 209                 if (! plugin_get_ondemand(pl)) {
 210                         if (plugin_get_active(pl))
 211                                 if (!plugin_load(pl))
 212                                         plugin_set_active(pl, 0);
 213                         if (plugin_get_active(pl))
 214                                 plugin_call_init(pl);
 215                 }
 216                 l=g_list_next(l);
 217         }
 218 #endif
 219 }
 220
 221 void
 222 plugins_destroy(struct plugins *pls)
 223 {
 224         GList *l;
 225         struct plugin *pl;
 226
 227         l=pls->list;
 228         while (l) {
 229                 pl=l->data;
 230                 plugin_unload(pl);
 231                 plugin_destroy(pl);
 232         }
 233         g_list_free(pls->list);
 234         g_hash_table_destroy(pls->hash);
 235         g_free(pls);
 236 }
 237
 238         void *
 239 plugin_get_type(enum plugin_type type, const char *type_name, const char *name)
 240 {
 241         dbg(1, "type=\"%s\", name=\"%s\"\n", type_name, name);
 242         GList *l,*lpls;
 243         struct name_val *nv;
 244         struct plugin *pl;
 245         char *mod_name, *filename=NULL, *corename=NULL;
 246         l=plugin_types[type];
 247         while (l) {
 248                 nv=l->data;
 249                 if (!g_ascii_strcasecmp(nv->name, name))
 250                         return nv->val;
 251                 l=g_list_next(l);
 252         }
 253         lpls=pls->list;
 254         if(!g_ascii_strcasecmp(type_name, "map"))
 255                 type_name="data";
 256         filename=g_strjoin("", "lib", type_name, "_", name, NULL);
 257         corename=g_strjoin("", "lib", type_name, "_", "core", NULL);
 258         while (lpls) {
 259                 pl=lpls->data;
 260                 if ((mod_name=g_strrstr(pl->name, "/")))
 261                         mod_name++;
 262                 else
 263                         mod_name=pl->name;
 264                 if (!g_ascii_strncasecmp(mod_name, filename, strlen(filename)) || !g_ascii_strncasecmp(mod_name, corename, strlen(filename))) {
 265                         dbg(0, "Loading module \"%s\"\n",pl->name) ;
 266                         if (plugin_get_active(pl))
 267                                 if (!plugin_load(pl))
 268                                         plugin_set_active(pl, 0);
 269                         if (plugin_get_active(pl))
 270                                 plugin_call_init(pl);
 271                         l=plugin_types[type];
 272                         while (l) {
 273                                 nv=l->data;
 274                                 if (!g_ascii_strcasecmp(nv->name, name)) {
 275                                         g_free(filename);
 276                                         g_free(corename);
 277                                         return nv->val;
 278                                 }
 279                                 l=g_list_next(l);
 280                         }
 281                 }
 282                 lpls=g_list_next(lpls);
 283         }
 284         g_free(filename);
 285         g_free(corename);
 286         return NULL;
 287 }