list.h

Go to the documentation of this file.

#ifndef LIST_H
#define LIST_H

struct dl_list {
        struct dl_list *next;
        struct dl_list *prev;
};

#define DL_LIST_HEAD_INIT(l) { &(l), &(l) }

static inline void dl_list_init(struct dl_list *list)
{
        list->next = list;
        list->prev = list;
}

static inline void dl_list_add(struct dl_list *list, struct dl_list *item)
{
        item->next = list->next;
        item->prev = list;
        list->next->prev = item;
        list->next = item;
}

static inline void dl_list_add_tail(struct dl_list *list, struct dl_list *item)
{
        dl_list_add(list->prev, item);
}

static inline void dl_list_del(struct dl_list *item)
{
        item->next->prev = item->prev;
        item->prev->next = item->next;
        item->next = NULL;
        item->prev = NULL;
}

static inline int dl_list_empty(struct dl_list *list)
{
        return list->next == list;
}

static inline unsigned int dl_list_len(struct dl_list *list)
{
        struct dl_list *item;
        int count = 0;
        for (item = list->next; item != list; item = item->next)
                count++;
        return count;
}

#ifndef offsetof
#define offsetof(type, member) ((long) &((type *) 0)->member)
#endif

#define dl_list_entry(item, type, member) \
        ((type *) ((char *) item - offsetof(type, member)))

#define dl_list_first(list, type, member) \
        (dl_list_empty((list)) ? NULL : \
         dl_list_entry((list)->next, type, member))

#define dl_list_last(list, type, member) \
        (dl_list_empty((list)) ? NULL : \
         dl_list_entry((list)->prev, type, member))

#define dl_list_for_each(item, list, type, member) \
        for (item = dl_list_entry((list)->next, type, member); \
             &item->member != (list); \
             item = dl_list_entry(item->member.next, type, member))

#define dl_list_for_each_safe(item, n, list, type, member) \
        for (item = dl_list_entry((list)->next, type, member), \
                     n = dl_list_entry(item->member.next, type, member); \
             &item->member != (list); \
             item = n, n = dl_list_entry(n->member.next, type, member))

#define dl_list_for_each_reverse(item, list, type, member) \
        for (item = dl_list_entry((list)->prev, type, member); \
             &item->member != (list); \
             item = dl_list_entry(item->member.prev, type, member))

#define DEFINE_DL_LIST(name) \
        struct dl_list name = { &(name), &(name) }

#endif /* LIST_H */