98 lines
2.6 KiB
C
98 lines
2.6 KiB
C
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/*
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* Copyright © 2010 Intel Corporation
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* Copyright © 2010 Francisco Jerez <currojerez@riseup.net>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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*/
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#ifndef _LIST_H_
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#define _LIST_H_
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/* classic doubly-link circular list */
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struct list {
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struct list *next, *prev;
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};
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static void
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list_init(struct list *list)
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{
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list->next = list->prev = list;
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}
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static inline void
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__list_add(struct list *entry,
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struct list *prev,
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struct list *next)
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{
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next->prev = entry;
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entry->next = next;
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entry->prev = prev;
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prev->next = entry;
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}
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static inline void
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list_add(struct list *entry, struct list *head)
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{
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__list_add(entry, head, head->next);
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}
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static inline void
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__list_del(struct list *prev, struct list *next)
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{
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next->prev = prev;
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prev->next = next;
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}
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static inline void
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list_del(struct list *entry)
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{
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__list_del(entry->prev, entry->next);
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list_init(entry);
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}
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static inline Bool
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list_is_empty(struct list *head)
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{
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return head->next == head;
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}
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#ifndef container_of
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#define container_of(ptr, type, member) \
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(type *)((char *)(ptr) - (char *) &((type *)0)->member)
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#endif
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#define list_entry(ptr, type, member) \
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container_of(ptr, type, member)
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#define list_first_entry(ptr, type, member) \
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list_entry((ptr)->next, type, member)
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#define __container_of(ptr, sample, member) \
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(void *)((char *)(ptr) \
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- ((char *)&(sample)->member - (char *)(sample)))
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#define list_for_each_entry(pos, head, member) \
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for (pos = __container_of((head)->next, pos, member); \
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&pos->member != (head); \
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pos = __container_of(pos->member.next, pos, member))
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#endif
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