1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef _INIT_LIST_H_
18#define _INIT_LIST_H_
19
20struct listnode
21{
22    struct listnode *next;
23    struct listnode *prev;
24};
25
26#define node_to_item(node, container, member) \
27    (container *) (((char*) (node)) - offsetof(container, member))
28
29#define list_declare(name) \
30    struct listnode name = { \
31        .next = &name, \
32        .prev = &name, \
33    }
34
35#define list_for_each(node, list) \
36    for (node = (list)->next; node != (list); node = node->next)
37
38#define list_for_each_reverse(node, list) \
39    for (node = (list)->prev; node != (list); node = node->prev)
40
41void list_init(struct listnode *list);
42void list_add_tail(struct listnode *list, struct listnode *item);
43void list_remove(struct listnode *item);
44
45#define list_empty(list) ((list) == (list)->next)
46#define list_head(list) ((list)->next)
47#define list_tail(list) ((list)->prev)
48
49#endif
50