90 lines
2.1 KiB
C
90 lines
2.1 KiB
C
|
/*
|
||
|
|
* Doubly-linked list
|
||
|
|
* Copyright (c) 2009, Jouni Malinen <j@w1.fi>
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License version 2 as
|
||
|
|
* published by the Free Software Foundation.
|
||
|
|
*
|
||
|
|
* Alternatively, this software may be distributed under the terms of BSD
|
||
|
|
* license.
|
||
|
|
*
|
||
|
|
* See README and COPYING for more details.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef LIST_H
|
||
|
|
#define LIST_H
|
||
|
|
|
||
|
|
/**
|
||
|
|
* struct dl_list - Doubly-linked list
|
||
|
|
*/
|
||
|
|
struct dl_list {
|
||
|
|
struct dl_list *next;
|
||
|
|
struct dl_list *prev;
|
||
|
|
};
|
||
|
|
|
||
|
|
static inline void dl_list_init(struct dl_list *list)
|
||
|
|
{
|
||
|
|
list->next = list;
|
||
|
|
list->prev = list;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void dl_list_add(struct dl_list *list, struct dl_list *item)
|
||
|
|
{
|
||
|
|
item->next = list->next;
|
||
|
|
item->prev = list;
|
||
|
|
list->next->prev = item;
|
||
|
|
list->next = item;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void dl_list_add_tail(struct dl_list *list, struct dl_list *item)
|
||
|
|
{
|
||
|
|
dl_list_add(list->prev, item);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void dl_list_del(struct dl_list *item)
|
||
|
|
{
|
||
|
|
item->next->prev = item->prev;
|
||
|
|
item->prev->next = item->next;
|
||
|
|
item->next = NULL;
|
||
|
|
item->prev = NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int dl_list_empty(struct dl_list *list)
|
||
|
|
{
|
||
|
|
return list->next == list;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline unsigned int dl_list_len(struct dl_list *list)
|
||
|
|
{
|
||
|
|
struct dl_list *item;
|
||
|
|
int count = 0;
|
||
|
|
for (item = list->next; item != list; item = item->next)
|
||
|
|
count++;
|
||
|
|
return count;
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifndef offsetof
|
||
|
|
#define offsetof(type, member) ((long) &((type *) 0)->member)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define dl_list_entry(item, type, member) \
|
||
|
|
((type *) ((char *) item - offsetof(type, member)))
|
||
|
|
|
||
|
|
#define dl_list_first(list, type, member) \
|
||
|
|
(dl_list_empty((list)) ? NULL : \
|
||
|
|
dl_list_entry((list)->next, type, member))
|
||
|
|
|
||
|
|
#define dl_list_for_each(item, list, type, member) \
|
||
|
|
for (item = dl_list_entry((list)->next, type, member); \
|
||
|
|
&item->member != (list); \
|
||
|
|
item = dl_list_entry(item->member.next, type, member))
|
||
|
|
|
||
|
|
#define dl_list_for_each_safe(item, n, list, type, member) \
|
||
|
|
for (item = dl_list_entry((list)->next, type, member), \
|
||
|
|
n = dl_list_entry(item->member.next, type, member); \
|
||
|
|
&item->member != (list); \
|
||
|
|
item = n, n = dl_list_entry(n->member.next, type, member))
|
||
|
|
|
||
|
|
#endif /* LIST_H */
|