tools/firewire/list.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 struct list {
   3         struct list *next, *prev;
   4 };
   5
   6 static inline void
   7 list_init(struct list *list)
   8 {
   9         list->next = list;
  10         list->prev = list;
  11 }
  12
  13 static inline int
  14 list_empty(struct list *list)
  15 {
  16         return list->next == list;
  17 }
  18
  19 static inline void
  20 list_insert(struct list *link, struct list *new_link)
  21 {
  22         new_link->prev          = link->prev;
  23         new_link->next          = link;
  24         new_link->prev->next    = new_link;
  25         new_link->next->prev    = new_link;
  26 }
  27
  28 static inline void
  29 list_append(struct list *list, struct list *new_link)
  30 {
  31         list_insert((struct list *)list, new_link);
  32 }
  33
  34 static inline void
  35 list_prepend(struct list *list, struct list *new_link)
  36 {
  37         list_insert(list->next, new_link);
  38 }
  39
  40 static inline void
  41 list_remove(struct list *link)
  42 {
  43         link->prev->next = link->next;
  44         link->next->prev = link->prev;
  45 }
  46
  47 #define list_entry(link, type, member) \
  48         ((type *)((char *)(link)-(unsigned long)(&((type *)0)->member)))
  49
  50 #define list_head(list, type, member)           \
  51         list_entry((list)->next, type, member)
  52
  53 #define list_tail(list, type, member)           \
  54         list_entry((list)->prev, type, member)
  55
  56 #define list_next(elm, member)                                  \
  57         list_entry((elm)->member.next, typeof(*elm), member)
  58
  59 #define list_for_each_entry(pos, list, member)                  \
  60         for (pos = list_head(list, typeof(*pos), member);       \
  61              &pos->member != (list);                            \
  62              pos = list_next(pos, member))
  63