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/* aKode: PluginHandler
Copyright (C) 2004 Allan Sandfeld Jensen <kde@carewolf.com>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "akodelib.h"
#include "pluginhandler.h"
#include <dirent.h>
#include <iostream>
#ifdef HAVE_LIBLTDL
#include <ltdl.h>
#else
#include <dlfcn.h>
#endif
#ifdef HAVE_LIBLTDL
#define DLCLOSE(x) lt_dlclose((lt_dlhandle)(x))
#define DLERROR() lt_dlerror()
#define DLSYM(x, y) lt_dlsym((lt_dlhandle)(x), (y))
#define DLINIT() lt_dlinit()
#define DLEXIT() lt_dlexit()
#else
#define DLCLOSE dlclose
#define DLERROR dlerror
#define DLSYM dlsym
#define DLINIT()
#define DLEXIT()
#endif
namespace aKode {
PluginHandler::PluginHandler() : library_loaded(false), handle(0)
{
DLINIT();
#ifdef HAVE_LIBLTDL
lt_dlsetsearchpath(AKODE_SEARCHDIR);
#endif
}
PluginHandler::PluginHandler(const string lib) : library_loaded(false), handle(0)
{
DLINIT();
if (lib.size() > 0)
load(lib);
}
PluginHandler::~PluginHandler()
{
unload();
DLEXIT();
}
list<string> PluginHandler::listPlugins() {
DIR *dir = opendir(AKODE_SEARCHDIR);
dirent *dp;
if (!dir) return list<string>();
list<string> out;
while ((dp = readdir (dir)) != 0) {
string name(dp->d_name);
if (name.length() < 15) continue;
if (name.substr(0,9) != "libakode_") continue;
#ifdef HAVE_LIBLTDL
int p = name.find(".la", 9);
#else
int p = name.find(".so", 9);
#endif
if (p == -1) continue;
string plugin = name.substr(9,p-9);
out.push_back(plugin);
}
return out;
}
bool PluginHandler::load(const string lib)
{
if (library_loaded) return false;
#ifdef HAVE_LIBLTDL
const string library = string("libakode_") + lib;
handle = lt_dlopenext(library.c_str());
#else
string library = "libakode_" + lib + ".so";
handle = dlopen(library.c_str(), RTLD_NOW);
if (!handle) { // this seems the simplest way to extent the search-path
library = string(AKODE_SEARCHDIR) +"/"+ library;
handle = dlopen(library.c_str(), RTLD_NOW);
}
#endif
if (!handle) {
return false;
}
library_loaded = true;
return true;
}
void PluginHandler::unload()
{
if (library_loaded) {
DLCLOSE(handle);
library_loaded = false;
}
}
void* PluginHandler::loadPlugin(const string name) {
void *plugin;
if (!handle) return 0;
DLERROR(); // clear errors
plugin = DLSYM(handle, name.c_str());
if (DLERROR()) return 0;
return plugin;
}
} //namespace
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