109 lines
2.7 KiB
C
109 lines
2.7 KiB
C
#ifndef __LIST_H
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#define __LIST_H
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#define container_of(ptr, type, member) ({ \
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const typeof( ((type *)0)->member ) *__mptr = (ptr); \
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(type *)( (char *)__mptr - offsetof(type,member) );})
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/****************************************************************
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* list - Double linked lists
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****************************************************************/
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struct list_node {
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struct list_node *next, *prev;
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};
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struct list_head {
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struct list_node root;
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};
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static inline void
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list_init(struct list_head *h)
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{
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h->root.prev = h->root.next = &h->root;
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}
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static inline int
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list_empty(const struct list_head *h)
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{
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return h->root.next == &h->root;
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}
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static inline void
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list_del(struct list_node *n)
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{
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struct list_node *prev = n->prev;
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struct list_node *next = n->next;
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next->prev = prev;
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prev->next = next;
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}
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static inline void
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__list_add(struct list_node *n, struct list_node *prev, struct list_node *next)
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{
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next->prev = n;
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n->next = next;
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n->prev = prev;
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prev->next = n;
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}
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static inline void
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list_add_after(struct list_node *n, struct list_node *prev)
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{
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__list_add(n, prev, prev->next);
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}
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static inline void
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list_add_before(struct list_node *n, struct list_node *next)
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{
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__list_add(n, next->prev, next);
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}
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static inline void
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list_add_head(struct list_node *n, struct list_head *h)
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{
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list_add_after(n, &h->root);
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}
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static inline void
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list_add_tail(struct list_node *n, struct list_head *h)
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{
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list_add_before(n, &h->root);
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}
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static inline void
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list_join_tail(struct list_head *add, struct list_head *h)
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{
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if (!list_empty(add)) {
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struct list_node *prev = h->root.prev;
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struct list_node *next = &h->root;
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struct list_node *first = add->root.next;
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struct list_node *last = add->root.prev;
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first->prev = prev;
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prev->next = first;
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last->next = next;
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next->prev = last;
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}
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}
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#define list_next_entry(pos, member) \
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container_of((pos)->member.next, typeof(*pos), member)
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#define list_first_entry(head, type, member) \
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container_of((head)->root.next, type, member)
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#define list_for_each_entry(pos, head, member) \
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for (pos = list_first_entry((head), typeof(*pos), member) \
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; &pos->member != &(head)->root \
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; pos = list_next_entry(pos, member))
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#define list_for_each_entry_safe(pos, n, head, member) \
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for (pos = list_first_entry((head), typeof(*pos), member) \
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, n = list_next_entry(pos, member) \
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; &pos->member != &(head)->root \
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; pos = n, n = list_next_entry(n, member))
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#endif // list.h
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