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helper/list: add list_for_each_entry_direction() 

Use a bool flag to specify if the list should be forward or
backward iterated.

Change-Id: Ied19d049f46cdcb7f50137d459cc7c02014526bc
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/6784
Tested-by: jenkins
This commit is contained in:
Antonio Borneo 2021-12-16 11:25:32 +01:00
parent 16cc853bcf
commit a11fe473ea
1 changed files with 14 additions and 0 deletions
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14
src/helper/list.h
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@ -656,6 +656,20 @@ static inline void list_splice_tail_init(struct list_head *list,
!list_entry_is_head(pos, head, member); \
pos = list_prev_entry(pos, member))
/**
* list_for_each_entry_direction - iterate forward/backward over list of given type
* @param forward the iterate direction, true for forward, false for backward.
* @param pos the type * to use as a loop cursor.
* @param head the head for your list.
* @param member the name of the list_head within the struct.
*/
#define list_for_each_entry_direction(forward, pos, head, member) \
for (pos = forward ? list_first_entry(head, typeof(*pos), member) \
: list_last_entry(head, typeof(*pos), member); \
!list_entry_is_head(pos, head, member); \
pos = forward ? list_next_entry(pos, member) \
: list_prev_entry(pos, member))
/**
* list_prepare_entry - prepare a pos entry for use in list_for_each_entry_continue()
* @param pos the type * to use as a start point