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/*
* Linux klist like system
*
* Copyright (c) 2016-2017 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef LIST_H
#define LIST_H
#ifndef NULL
#include <stddef.h>
#endif
struct list_head {
struct list_head *prev;
struct list_head *next;
};
#define LIST_HEAD_INIT(el) { &(el), &(el) }
/* return the pointer of type 'type *' containing 'el' as field 'member' */
#define list_entry(el, type, member) \
((type *)((uint8_t *)(el) - offsetof(type, member)))
static inline void init_list_head(struct list_head *head)
{
head->prev = head;
head->next = head;
}
/* insert 'el' between 'prev' and 'next' */
static inline void list_add_impl(struct list_head *el,
struct list_head *prev, struct list_head *next)
{
prev->next = el;
el->prev = prev;
el->next = next;
next->prev = el;
}
/* add 'el' at the head of the list 'head' (= after element head) */
static inline void list_add(struct list_head *el, struct list_head *head)
{
list_add_impl(el, head, head->next);
}
/* add 'el' at the end of the list 'head' (= before element head) */
static inline void list_add_tail(struct list_head *el, struct list_head *head)
{
list_add_impl(el, head->prev, head);
}
static inline void list_del(struct list_head *el)
{
struct list_head *prev, *next;
prev = el->prev;
next = el->next;
prev->next = next;
next->prev = prev;
el->prev = NULL; /* fail safe */
el->next = NULL; /* fail safe */
}
static inline int list_empty(struct list_head *el)
{
return el->next == el;
}
#define list_for_each(el, head) \
for(el = (head)->next; el != (head); el = el->next)
#define list_for_each_safe(el, el1, head) \
for(el = (head)->next, el1 = el->next; el != (head); \
el = el1, el1 = el->next)
#define list_for_each_prev(el, head) \
for(el = (head)->prev; el != (head); el = el->prev)
#define list_for_each_prev_safe(el, el1, head) \
for(el = (head)->prev, el1 = el->prev; el != (head); \
el = el1, el1 = el->prev)
#endif /* LIST_H */
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