libBLOC

/*
 * Copyright (C) 2023 Barry
 *
 * This file is part of Barry's Little Objects in C Library (libBLOC).
 *
 * libBLOC 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.
 *
 * libBLOC is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTIBILITY 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
 * libBLOC.  If not, see <https://www.gnu.org/licenses/>.
 */

#include <BLOC/object.h>
#include <BLOC/list.h>
#include "../assert.h"
#include "list.h"

/* Pop the first object in a list */
void *
list_pop_head(List *list)
{
	ASSERT(list);
	void *obj = NULL;
	obj_lock(list);
	if (list->header.start) {
		obj = obj_get(list->header.start->obj);
		list_remove(list, obj);
	}
	obj_unlock(list);
	return obj;
}

/* Pop the last object in a list */
void *
list_pop_tail(List *list)
{
	ASSERT(list);
	void *obj = NULL;
	obj_lock(list);
	if (list->header.end) {
		obj = obj_get(list->header.end->obj);
		list_remove(list, obj);
	}
	obj_unlock(list);
	return obj;
}