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list: Add additional list helper functions 

Add list_is_first, list_is_last, list_last_entry, and list_prev_entry
helper functions.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2019-09-27 18:24:18 -04:00
parent fdbdb3c707
commit c06f6943a6
1 changed files with 18 additions and 0 deletions
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18
klippy/chelper/list.h
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@ -30,6 +30,18 @@ list_empty(const struct list_head *h)
return h->root.next == &h->root; return h->root.next == &h->root;
} }
static inline int
list_is_first(const struct list_node *n, const struct list_head *h)
{
return n->prev == &h->root;
}
static inline int
list_is_last(const struct list_node *n, const struct list_head *h)
{
return n->next == &h->root;
}
static inline void static inline void
list_del(struct list_node *n) list_del(struct list_node *n)
{ {
@ -90,9 +102,15 @@ list_join_tail(struct list_head *add, struct list_head *h)
#define list_next_entry(pos, member) \ #define list_next_entry(pos, member) \
container_of((pos)->member.next, typeof(*pos), member) container_of((pos)->member.next, typeof(*pos), member)
#define list_prev_entry(pos, member) \
container_of((pos)->member.prev, typeof(*pos), member)
#define list_first_entry(head, type, member) \ #define list_first_entry(head, type, member) \
container_of((head)->root.next, type, member) container_of((head)->root.next, type, member)
#define list_last_entry(head, type, member) \
container_of((head)->root.prev, type, member)
#define list_for_each_entry(pos, head, member) \ #define list_for_each_entry(pos, head, member) \
for (pos = list_first_entry((head), typeof(*pos), member) \ for (pos = list_first_entry((head), typeof(*pos), member) \
; &pos->member != &(head)->root \ ; &pos->member != &(head)->root \