/*
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* Doubly-linked list
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* Copyright (c) 2009-2019, Jouni Malinen <j@w1.fi>
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*
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* This software may be distributed under the terms of the BSD license.
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* See README for more details.
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*/
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#ifndef LIST_H
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#define LIST_H
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/**
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* struct dl_list - Doubly-linked list
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*/
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struct dl_list {
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struct dl_list *next;
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struct dl_list *prev;
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};
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#define DL_LIST_HEAD_INIT(l) { &(l), &(l) }
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static inline void dl_list_init(struct dl_list *list)
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{
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list->next = list;
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list->prev = list;
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}
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static inline void dl_list_add(struct dl_list *list, struct dl_list *item)
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{
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item->next = list->next;
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item->prev = list;
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list->next->prev = item;
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list->next = item;
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}
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static inline void dl_list_add_tail(struct dl_list *list, struct dl_list *item)
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{
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dl_list_add(list->prev, item);
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}
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static inline void dl_list_del(struct dl_list *item)
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{
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item->next->prev = item->prev;
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item->prev->next = item->next;
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item->next = NULL;
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item->prev = NULL;
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}
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static inline int dl_list_empty(struct dl_list *list)
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{
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return list->next == list;
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}
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static inline unsigned int dl_list_len(struct dl_list *list)
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{
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struct dl_list *item;
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int count = 0;
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for (item = list->next; item != list; item = item->next)
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count++;
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return count;
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}
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#ifndef offsetof
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#define offsetof(type, member) ((long) &((type *) 0)->member)
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#endif
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#define dl_list_entry(item, type, member) \
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((type *) ((char *) item - offsetof(type, member)))
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#define dl_list_first(list, type, member) \
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(dl_list_empty((list)) ? NULL : \
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dl_list_entry((list)->next, type, member))
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#define dl_list_last(list, type, member) \
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(dl_list_empty((list)) ? NULL : \
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dl_list_entry((list)->prev, type, member))
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#define dl_list_for_each(item, list, type, member) \
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for (item = dl_list_first((list), type, member); \
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item && item != dl_list_entry((list), type, member); \
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item = dl_list_entry(item->member.next, type, member))
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#define dl_list_for_each_safe(item, n, list, type, member) \
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for (item = dl_list_entry((list)->next, type, member), \
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n = dl_list_entry(item->member.next, type, member); \
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&item->member != (list); \
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item = n, n = dl_list_entry(n->member.next, type, member))
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#define dl_list_for_each_reverse(item, list, type, member) \
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for (item = dl_list_entry((list)->prev, type, member); \
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&item->member != (list); \
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item = dl_list_entry(item->member.prev, type, member))
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#define DEFINE_DL_LIST(name) \
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struct dl_list name = { &(name), &(name) }
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#endif /* LIST_H */
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