/*
 * OMAP3 ISP library - Double linked lists
 *
 * Copyright (C) 2010-2011 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 *
 * 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 2 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, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef __LIST_H
#define __LIST_H

#include <stddef.h>

struct list_entry {
	struct list_entry *prev;
	struct list_entry *next;
};

static inline void list_init(struct list_entry *list)
{
	list->next = list;
	list->prev = list;
}

static inline void list_append(struct list_entry *entry, struct list_entry *list)
{
	entry->next = list;
	entry->prev = list->prev;
	list->prev->next = entry;
	list->prev = entry;
}

static inline void list_prepend(struct list_entry *entry, struct list_entry *list)
{
	entry->next = list->next;
	entry->prev = list;
	list->next->prev = entry;
	list->next = entry;
}

#define list_entry(entry, type, member) \
	(type *)((char *)(entry) - offsetof(type, member))

#define list_for_each(entry, list) \
	for (entry = (list)->next; entry != (list); entry = entry->next)

#define list_for_each_entry(entry, list, member) \
	for (entry = list_entry((list)->next, typeof(*entry), member); \
	     &entry->member != (list); \
	     entry = list_entry(entry->member.next, typeof(*entry), member))

#define list_for_each_safe(entry, __next, list) \
	for (entry = (list)->next, __next = entry->next; entry != (list); \
	     entry = __next, __next = entry->next)

#define list_for_each_entry_safe(entry, __next, list, member) \
	for (entry = list_entry((list)->next, typeof(*entry), member), \
	     __next = list_entry(entry->member.next, typeof(*entry), member); \
	     &entry->member != (list); \
	     entry = __next, __next = list_entry(entry->member.next, typeof(*entry), member))

#endif /* __LIST_H */