1 /*
2 * Copyright (C) 2008-2013 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
22 #ifdef __cplusplus
23 extern "C" {
24 #endif /* __cplusplus */
25
26 struct listnode
27 {
28 struct listnode *next;
29 struct listnode *prev;
30 };
31
32 #define node_to_item(node, container, member) \
33 (container *) (((char*) (node)) - offsetof(container, member))
34
35 #define list_declare(name) \
36 struct listnode name = { \
37 .next = &name, \
38 .prev = &name, \
39 }
40
41 #define list_for_each(node, list) \
42 for (node = (list)->next; node != (list); node = node->next)
43
44 #define list_for_each_reverse(node, list) \
45 for (node = (list)->prev; node != (list); node = node->prev)
46
47 #define list_for_each_safe(node, n, list) \
48 for (node = (list)->next, n = node->next; \
49 node != (list); \
50 node = n, n = node->next)
51
list_init(struct listnode * node)52 static inline void list_init(struct listnode *node)
53 {
54 node->next = node;
55 node->prev = node;
56 }
57
list_add_tail(struct listnode * head,struct listnode * item)58 static inline void list_add_tail(struct listnode *head, struct listnode *item)
59 {
60 item->next = head;
61 item->prev = head->prev;
62 head->prev->next = item;
63 head->prev = item;
64 }
65
list_add_head(struct listnode * head,struct listnode * item)66 static inline void list_add_head(struct listnode *head, struct listnode *item)
67 {
68 item->next = head->next;
69 item->prev = head;
70 head->next->prev = item;
71 head->next = item;
72 }
73
list_remove(struct listnode * item)74 static inline void list_remove(struct listnode *item)
75 {
76 item->next->prev = item->prev;
77 item->prev->next = item->next;
78 }
79
80 #define list_empty(list) ((list) == (list)->next)
81 #define list_head(list) ((list)->next)
82 #define list_tail(list) ((list)->prev)
83
84 #ifdef __cplusplus
85 };
86 #endif /* __cplusplus */
87
88 #endif
89