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/*
* Copyright (C) 2008-2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef _CUTILS_LIST_H_
#define _CUTILS_LIST_H_
#include <stddef.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
struct listnode
{
struct listnode *next;
struct listnode *prev;
};
#define node_to_item(node, container, member) \
(container *) (((char*) (node)) - offsetof(container, member))
#define list_declare(name) \
struct listnode name = { \
.next = &name, \
.prev = &name, \
}
#define list_for_each(node, list) \
for (node = (list)->next; node != (list); node = node->next)
#define list_for_each_reverse(node, list) \
for (node = (list)->prev; node != (list); node = node->prev)
#define list_for_each_safe(node, n, list) \
for (node = (list)->next, n = node->next; \
node != (list); \
node = n, n = node->next)
static inline void list_init(struct listnode *node)
{
node->next = node;
node->prev = node;
}
static inline void list_add_tail(struct listnode *head, struct listnode *item)
{
item->next = head;
item->prev = head->prev;
head->prev->next = item;
head->prev = item;
}
static inline void list_add_head(struct listnode *head, struct listnode *item)
{
item->next = head->next;
item->prev = head;
head->next->prev = item;
head->next = item;
}
static inline void list_remove(struct listnode *item)
{
item->next->prev = item->prev;
item->prev->next = item->next;
}
#define list_empty(list) ((list) == (list)->next)
#define list_head(list) ((list)->next)
#define list_tail(list) ((list)->prev)
#ifdef __cplusplus
};
#endif /* __cplusplus */
#endif
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