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https://gitlab.freedesktop.org/emersion/libliftoff.git
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a08c4d1f08
Introduce a function to swap elements in a doubly linked list. This will be helpful when keeping the list of output layers sorted by priority. v2: re-define in terms of list_inserts and list_removes
46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
#ifndef LIST_H
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#define LIST_H
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#include <stdbool.h>
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#include <stddef.h>
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struct liftoff_list {
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struct liftoff_list *prev;
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struct liftoff_list *next;
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};
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void
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liftoff_list_init(struct liftoff_list *list);
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void
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liftoff_list_insert(struct liftoff_list *list, struct liftoff_list *elm);
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void
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liftoff_list_remove(struct liftoff_list *elm);
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void
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liftoff_list_swap(struct liftoff_list *this, struct liftoff_list *other);
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size_t
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liftoff_list_length(const struct liftoff_list *list);
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bool
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liftoff_list_empty(const struct liftoff_list *list);
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#define liftoff_container_of(ptr, sample, member) \
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(__typeof__(sample))((char *)(ptr) - \
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offsetof(__typeof__(*sample), member))
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#define liftoff_list_for_each(pos, head, member) \
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for (pos = liftoff_container_of((head)->next, pos, member); \
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&pos->member != (head); \
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pos = liftoff_container_of(pos->member.next, pos, member))
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#define liftoff_list_for_each_safe(pos, tmp, head, member) \
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for (pos = liftoff_container_of((head)->next, pos, member), \
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tmp = liftoff_container_of(pos->member.next, tmp, member); \
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&pos->member != (head); \
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pos = tmp, \
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tmp = liftoff_container_of(pos->member.next, tmp, member))
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#endif
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