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#ifndef _LVM_LIST_H
#define _LVM_LIST_H
#include <assert.h>
struct list {
struct list *n, *p;
};
#define LIST_INIT(name) struct list name = { &(name), &(name) }
static inline void list_init(struct list *head)
{
head->n = head->p = head;
}
static inline void list_add(struct list *head, struct list *elem)
{
assert(head->n);
elem->n = head;
elem->p = head->p;
head->p->n = elem;
head->p = elem;
}
static inline void list_add_h(struct list *head, struct list *elem)
{
assert(head->n);
elem->n = head->n;
elem->p = head;
head->n->p = elem;
head->n = elem;
}
static inline void list_del(struct list *elem)
{
elem->n->p = elem->p;
elem->p->n = elem->n;
}
static inline int list_empty(struct list *head)
{
return head->n == head;
}
static inline int list_end(struct list *head, struct list *elem)
{
return elem->n == head;
}
static inline struct list *list_next(struct list *head, struct list *elem)
{
return (list_end(head, elem) ? NULL : elem->n);
}
#define list_item(v, t) \
((t *)((uintptr_t)(v) - (uintptr_t)&((t *) 0)->list))
#define list_struct_base(v, t, h) \
((t *)((uintptr_t)(v) - (uintptr_t)&((t *) 0)->h))
/* Given a known element in a known structure, locate another */
#define struct_field(v, t, e, f) \
(((t *)((uintptr_t)(v) - (uintptr_t)&((t *) 0)->e))->f)
/* Given a known element in a known structure, locate the list head */
#define list_head(v, t, e) struct_field(v, t, e, list)
#define list_iterate(v, head) \
for (v = (head)->n; v != head; v = v->n)
#define list_uniterate(v, head, start) \
for (v = (start)->p; v != head; v = v->p)
#define list_iterate_safe(v, t, head) \
for (v = (head)->n, t = v->n; v != head; v = t, t = v->n)
#define list_iterate_items(v, head) \
for (v = list_item((head)->n, typeof(*v)); &v->list != (head); \
v = list_item(v->list.n, typeof(*v)))
static inline unsigned int list_size(const struct list *head)
{
unsigned int s = 0;
const struct list *v;
list_iterate(v, head)
s++;
return s;
}
#endif

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