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      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
     60