list.h revision da04c52ab1036048520fca265cf02b61dca789e0 
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 _CUTILS_LIST_H_
18#define _CUTILS_LIST_H_
19
20#include <stddef.h>
21
22struct listnode
23{
24    struct listnode *next;
25    struct listnode *prev;
26};
27
28#define node_to_item(node, container, member) \
29    (container *) (((char*) (node)) - offsetof(container, member))
30
31#define list_declare(name) \
32    struct listnode name = { \
33        .next = &name, \
34        .prev = &name, \
35    }
36
37#define list_for_each(node, list) \
38    for (node = (list)->next; node != (list); node = node->next)
39
40#define list_for_each_reverse(node, list) \
41    for (node = (list)->prev; node != (list); node = node->prev)
42
43void list_init(struct listnode *list);
44void list_add_tail(struct listnode *list, struct listnode *item);
45void list_remove(struct listnode *item);
46
47#define list_empty(list) ((list) == (list)->next)
48#define list_head(list) ((list)->next)
49#define list_tail(list) ((list)->prev)
50
51#endif
52