/*

 *  Bag of pointers

 *  Copyright (c) 2001 by Abramo Bagnara <abramo@alsa-project.org>

 *

 *

 *   This library is free software; you can redistribute it and/or modify

 *   it under the terms of the GNU Lesser General Public License as

 *   published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.

 *

 *   You should have received a copy of the GNU Lesser General Public

 *   License along with this library; if not, write to the Free Software

 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

 *

 */

#include "mixer_local.h"

int bag_new(bag_t **bag)

{

	bag_t *b = malloc(sizeof(*b));

	if (!b)

		return -ENOMEM;

	INIT_LIST_HEAD(b);

	*bag = b;

	return 0;

}

void bag_free(bag_t *bag)

{

	assert(list_empty(bag));

	free(bag);

}

int bag_empty(bag_t *bag)

{

	return list_empty(bag);

}

int bag_add(bag_t *bag, void *ptr)

{

	bag1_t *b = malloc(sizeof(*b));

	if (!b)

		return -ENOMEM;

	b->ptr = ptr;

	list_add_tail(&b->list, bag);

	return 0;

}

int bag_del(bag_t *bag, void *ptr)

{

	struct list_head *pos;

	list_for_each(pos, bag) {

		bag1_t *b = list_entry(pos, bag1_t, list);

		if (b->ptr == ptr) {

			list_del(&b->list);

			free(b);

			return 0;

		}

	}

	return -ENOENT;

}

void bag_del_all(bag_t *bag)

{

	while (!list_empty(bag))

		list_del(bag->next);

}