cutils/list.h

   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
  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 void list_init(struct listnode *list);
  48 void list_add_tail(struct listnode *list, struct listnode *item);
  49 void list_remove(struct listnode *item);
  50
  51 #define list_empty(list) ((list) == (list)->next)
  52 #define list_head(list) ((list)->next)
  53 #define list_tail(list) ((list)->prev)
  54
  55 #ifdef __cplusplus
  56 };
  57 #endif /* __cplusplus */
  58
  59 #endif