list.h 1.3 KB

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  1. /* SPDX-License-Identifier: GPL-2.0 */
  2. struct list {
  3. struct list *next, *prev;
  4. };
  5. static inline void
  6. list_init(struct list *list)
  7. {
  8. list->next = list;
  9. list->prev = list;
  10. }
  11. static inline int
  12. list_empty(struct list *list)
  13. {
  14. return list->next == list;
  15. }
  16. static inline void
  17. list_insert(struct list *link, struct list *new_link)
  18. {
  19. new_link->prev = link->prev;
  20. new_link->next = link;
  21. new_link->prev->next = new_link;
  22. new_link->next->prev = new_link;
  23. }
  24. static inline void
  25. list_append(struct list *list, struct list *new_link)
  26. {
  27. list_insert((struct list *)list, new_link);
  28. }
  29. static inline void
  30. list_prepend(struct list *list, struct list *new_link)
  31. {
  32. list_insert(list->next, new_link);
  33. }
  34. static inline void
  35. list_remove(struct list *link)
  36. {
  37. link->prev->next = link->next;
  38. link->next->prev = link->prev;
  39. }
  40. #define list_entry(link, type, member) \
  41. ((type *)((char *)(link)-(unsigned long)(&((type *)0)->member)))
  42. #define list_head(list, type, member) \
  43. list_entry((list)->next, type, member)
  44. #define list_tail(list, type, member) \
  45. list_entry((list)->prev, type, member)
  46. #define list_next(elm, member) \
  47. list_entry((elm)->member.next, typeof(*elm), member)
  48. #define list_for_each_entry(pos, list, member) \
  49. for (pos = list_head(list, typeof(*pos), member); \
  50. &pos->member != (list); \
  51. pos = list_next(pos, member))