/*
 * Copyright 2018 The Hafnium Authors.
 *
 * Use of this source code is governed by a BSD-style
 * license that can be found in the LICENSE file or at
 * https://opensource.org/licenses/BSD-3-Clause.
 */

#pragma once

#include <stdbool.h>
#include <stddef.h>

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

#define LIST_INIT(l) {.next = &(l), .prev = &(l)}

#define CONTAINER_OF(ptr, type, field) \
	((type *)((char *)(ptr) - offsetof(type, field)))

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

static inline void list_prepend(struct list_entry *l, struct list_entry *e)
{
	e->next = l;
	e->prev = l->prev;

	e->next->prev = e;
	e->prev->next = e;
}

static inline void list_append(struct list_entry *l, struct list_entry *e)
{
	e->next = l->next;
	e->prev = l;

	e->next->prev = e;
	e->prev->next = e;
}

static inline bool list_empty(struct list_entry *l)
{
	return l->next == l;
}

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