#ifndef __SOF_LIST_H__

#define __SOF_LIST_H__

struct list_item;

struct list_item {

struct list_item *next;

struct list_item *prev;

};

#define LIST_INIT(head) {&head, &head}

static inline void list_init(struct list_item *list)

{

list->next = list;

list->prev = list;

}

static inline void list_item_prepend(struct list_item *item,

struct list_item *list)

{

struct list_item *next = list->next;

next->prev = item;

item->next = next;

item->prev = list;

list->next = item;

}

static inline void list_item_append(struct list_item *item,

struct list_item *list)

{

struct list_item *tail = list->prev;

tail->next = item;

item->next = list;

item->prev = tail;

list->prev = item;

}

static inline void list_item_del(struct list_item *item)

{

item->next->prev = item->prev;

item->prev->next = item->next;

list_init(item);

}

static inline int list_item_is_last(struct list_item *item,

struct list_item *list)

{

return item->next == list;

}

#define list_is_empty(item) \

((item)->next == item)

#define __list_object(item, type, offset) \

((type *)((char *)(item) - (offset)))

#define list_item(item, type, member) \

__list_object(item, type, offsetof(type, member))

#define list_first_item(list, type, member) \

__list_object((list)->next, type, offsetof(type, member))

#define list_next_item(object, member) \

list_item((object)->member.next, typeof(*(object)), member)

#define list_for_item(item, list) \

for (item = (list)->next; item != (list); item = item->next)

#define list_for_item_prev(item, list) \

for (item = (list)->prev; item != (list); item = item->prev)

#define list_for_item_safe(item, tmp, list) \

for (item = (list)->next, tmp = item->next;\

item != (list); \

item = tmp, tmp = item->next)

static inline void list_relink(struct list_item *new_list,

struct list_item *old_list)

{

struct list_item *li;

if (new_list->next == old_list) {

list_init(new_list);

} else {

list_for_item(li, new_list)

if (li->next == old_list)

li->next = new_list; /* for stops here */

list_for_item_prev(li, new_list)

if (li->prev == old_list)

li->prev = new_list; /* for stops here */

}

}

#endif /* __SOF_LIST_H__ */