1 struct list {
2 struct list *next, *prev;
3 };
4
5 static inline void
list_init(struct list * list)6 list_init(struct list *list)
7 {
8 list->next = list;
9 list->prev = list;
10 }
11
12 static inline int
list_empty(struct list * list)13 list_empty(struct list *list)
14 {
15 return list->next == list;
16 }
17
18 static inline void
list_insert(struct list * link,struct list * new_link)19 list_insert(struct list *link, struct list *new_link)
20 {
21 new_link->prev = link->prev;
22 new_link->next = link;
23 new_link->prev->next = new_link;
24 new_link->next->prev = new_link;
25 }
26
27 static inline void
list_append(struct list * list,struct list * new_link)28 list_append(struct list *list, struct list *new_link)
29 {
30 list_insert((struct list *)list, new_link);
31 }
32
33 static inline void
list_prepend(struct list * list,struct list * new_link)34 list_prepend(struct list *list, struct list *new_link)
35 {
36 list_insert(list->next, new_link);
37 }
38
39 static inline void
list_remove(struct list * link)40 list_remove(struct list *link)
41 {
42 link->prev->next = link->next;
43 link->next->prev = link->prev;
44 }
45
46 #define list_entry(link, type, member) \
47 ((type *)((char *)(link)-(unsigned long)(&((type *)0)->member)))
48
49 #define list_head(list, type, member) \
50 list_entry((list)->next, type, member)
51
52 #define list_tail(list, type, member) \
53 list_entry((list)->prev, type, member)
54
55 #define list_next(elm, member) \
56 list_entry((elm)->member.next, typeof(*elm), member)
57
58 #define list_for_each_entry(pos, list, member) \
59 for (pos = list_head(list, typeof(*pos), member); \
60 &pos->member != (list); \
61 pos = list_next(pos, member))
62
63