mirror of
git://sourceware.org/git/lvm2.git
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100 lines
1.9 KiB
C
100 lines
1.9 KiB
C
/*
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* Copyright (C) 2001 Sistina Software
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*
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* This file is released under the LGPL.
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*/
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#ifndef _LVM_LIST_H
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#define _LVM_LIST_H
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#include <assert.h>
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struct list {
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struct list *n, *p;
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};
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#define LIST_INIT(name) struct list name = { &(name), &(name) }
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static inline void list_init(struct list *head)
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{
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head->n = head->p = head;
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}
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static inline void list_add(struct list *head, struct list *elem)
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{
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assert(head->n);
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elem->n = head;
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elem->p = head->p;
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head->p->n = elem;
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head->p = elem;
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}
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static inline void list_add_h(struct list *head, struct list *elem)
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{
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assert(head->n);
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elem->n = head->n;
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elem->p = head;
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head->n->p = elem;
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head->n = elem;
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}
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static inline void list_del(struct list *elem)
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{
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elem->n->p = elem->p;
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elem->p->n = elem->n;
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}
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static inline int list_empty(struct list *head)
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{
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return head->n == head;
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}
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static inline int list_end(struct list *head, struct list *elem)
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{
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return elem->n == head;
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}
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static inline struct list *list_next(struct list *head, struct list *elem)
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{
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return (list_end(head, elem) ? NULL : elem->n);
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}
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#define list_iterate(v, head) \
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for (v = (head)->n; v != head; v = v->n)
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#define list_uniterate(v, head, start) \
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for (v = (start)->p; v != head; v = v->p)
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#define list_iterate_safe(v, t, head) \
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for (v = (head)->n, t = v->n; v != head; v = t, t = v->n)
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static inline unsigned int list_size(const struct list *head)
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{
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unsigned int s = 0;
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const struct list *v;
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list_iterate(v, head)
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s++;
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return s;
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}
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#define list_item(v, t) \
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((t *)((uintptr_t)(v) - (uintptr_t)&((t *) 0)->list))
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#define list_struct_base(v, t, h) \
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((t *)((uintptr_t)(v) - (uintptr_t)&((t *) 0)->h))
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/* Given a known element in a known structure, locate another */
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#define struct_field(v, t, e, f) \
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(((t *)((uintptr_t)(v) - (uintptr_t)&((t *) 0)->e))->f)
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/* Given a known element in a known structure, locate the list head */
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#define list_head(v, t, e) struct_field(v, t, e, list)
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#endif
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