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/*
* Gregorio plugin loader.
* Copyright (C) 2008 Jeremie Corbier
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <string.h>
#include <ltdl.h>
#include <gregorio/plugin_loader.h>
int gregorio_plugin_loader_init ()
{
return lt_dlinit();
}
int gregorio_plugin_loader_exit ()
{
return lt_dlexit();
}
/*
* Holds LTDL handle and plugin infos - should only be accessed through
* gregorio_plugin_get_info.
*/
struct gregorio_plugin {
gregorio_plugin_info *info;
lt_dlhandle handle;
};
/*
* Internal struct - workaround to pass two parameters to lt_dlforeachfiles
* utility function
*/
struct load_params {
const char *id;
gregorio_plugin *plugin;
};
static int do_load_plugin(const char *filename, void *data)
{
struct load_params *params = (struct load_params *)data;
params->plugin->handle = lt_dlopenext(filename);
if (params->plugin->handle == NULL)
{
return 0;
}
params->plugin->info = lt_dlsym(params->plugin->handle, "info");
if (params->plugin->info == NULL)
{
goto end;
}
if (strcmp(params->plugin->info->id, params->id) == 0)
{
return 1;
}
end:
lt_dlclose(params->plugin->handle);
params->plugin->handle = NULL;
return 0;
}
gregorio_plugin *gregorio_plugin_load (const char *path, const char *id)
{
struct load_params params;
params.id = id;
params.plugin = malloc (sizeof(gregorio_plugin));
if (params.plugin == NULL)
{
return NULL;
}
/* Find the first plugin in path matching params.id */
lt_dlforeachfile (path, do_load_plugin, (void *)¶ms);
if (params.plugin->handle == NULL)
{
free(params.plugin);
return NULL;
}
return params.plugin;
}
void gregorio_plugin_unload (gregorio_plugin *plugin)
{
if (plugin != NULL)
{
lt_dlclose(plugin->handle);
free(plugin);
}
}
gregorio_plugin_info *gregorio_plugin_get_info(gregorio_plugin *plugin)
{
if (plugin != NULL)
{
return plugin->info;
}
return NULL;
}
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