/**
 * \file
 * Get an interface implementation from a implementation structure.
 *
 * \author	Georg Hopp
 *
 * \copyright
 * Copyright © 2012  Georg Hopp
 *
 * 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 <sys/types.h>
#include <stdlib.h>

#include "tr/interface.h"
#include "tr/commons.h"

/**
 * Compare interfaces.
 * Used with bsearch on the interfaces.
 */
static
inline
int
comp(const void * _a, const void * _b)
{
	const struct interface * a = **(const struct interface ***)_a;
	const struct interface * b = **(const struct interface ***)_b;
    return ((a)<(b))? -1 : ((a)>(b))? 1 : 0;
}

/**
 * Get a specific interface implementation from the interface
 * implementation from a class.
 */
TR_iface_ptr
TR_interfaceGet(TR_iface_impl_ptr iface_impl, const TR_iface_ptr _iface)
{
	const TR_iface_ptr * iface = &_iface;
	TR_iface_ptr *       found;

    if (! iface_impl->simpl) {
        qsort(
				(void**)(iface_impl->impl),
				iface_impl->nimpl,
				sizeof(TR_iface_ptr), comp);
        iface_impl->simpl=TRUE;
    }

    found = bsearch(
			&iface,
			iface_impl->impl,
			iface_impl->nimpl,
			sizeof(TR_iface_ptr),
			comp);

	return found? *found : (TR_iface_ptr)NULL;
}

// vim: set ts=4 sw=4: