Signed-off-by: Chia-I Wu <olvaffe@gmail.com> Reviewed-by: Yiwei Zhang <zzyiwei@chromium.org> Reviewed-by: Ryan Neph <ryanneph@google.com> Acked-by: Gert Wollny <gert.wollny@collabora.com> v2: keep u_double_list.h for the momentmacos/master
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/**************************************************************************
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* |
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* Copyright 2006 VMware, Inc., Bismarck, ND. USA. |
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* All Rights Reserved. |
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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 |
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* "Software"), to deal in the Software without restriction, including |
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* without limitation the rights to use, copy, modify, merge, publish, |
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* distribute, sub license, and/or sell copies of the Software, and to |
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* permit persons to whom the Software is furnished to do so, subject to |
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* the following conditions: |
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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 NON-INFRINGEMENT. IN NO EVENT SHALL |
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, |
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR |
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE |
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* USE OR OTHER DEALINGS IN THE SOFTWARE. |
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* |
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* The above copyright notice and this permission notice (including the |
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* next paragraph) shall be included in all copies or substantial portions |
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* of the Software. |
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* |
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**************************************************************************/ |
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/**
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* \file |
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* List macros heavily inspired by the Linux kernel |
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* list handling. No list looping yet. |
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* |
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* Is not threadsafe, so common operations need to |
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* be protected using an external mutex. |
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*/ |
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#ifndef _UTIL_LIST_H_ |
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#define _UTIL_LIST_H_ |
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#include <stdbool.h> |
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#include <stddef.h> |
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#include <assert.h> |
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#include "c99_compat.h" |
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#ifdef DEBUG |
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# define list_assert(cond, msg) assert(cond && msg) |
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#else |
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# define list_assert(cond, msg) (void)(0 && (cond)) |
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#endif |
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struct list_head |
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{ |
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struct list_head *prev; |
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struct list_head *next; |
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}; |
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static inline void list_inithead(struct list_head *item) |
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{ |
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item->prev = item; |
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item->next = item; |
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} |
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static inline void list_add(struct list_head *item, struct list_head *list) |
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{ |
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item->prev = list; |
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item->next = list->next; |
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list->next->prev = item; |
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list->next = item; |
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} |
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static inline void list_addtail(struct list_head *item, struct list_head *list) |
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{ |
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item->next = list; |
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item->prev = list->prev; |
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list->prev->next = item; |
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list->prev = item; |
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} |
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static inline bool list_is_empty(const struct list_head *list); |
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static inline void list_replace(struct list_head *from, struct list_head *to) |
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{ |
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if (list_is_empty(from)) { |
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list_inithead(to); |
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} else { |
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to->prev = from->prev; |
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to->next = from->next; |
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from->next->prev = to; |
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from->prev->next = to; |
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} |
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} |
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static inline void list_del(struct list_head *item) |
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{ |
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item->prev->next = item->next; |
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item->next->prev = item->prev; |
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item->prev = item->next = NULL; |
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} |
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static inline void list_delinit(struct list_head *item) |
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{ |
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item->prev->next = item->next; |
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item->next->prev = item->prev; |
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item->next = item; |
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item->prev = item; |
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} |
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static inline bool list_is_empty(const struct list_head *list) |
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{ |
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return list->next == list; |
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} |
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static inline bool list_is_linked(const struct list_head *list) |
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{ |
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/* both must be NULL or both must be not NULL */ |
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assert((list->prev != NULL) == (list->next != NULL)); |
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return list->next != NULL; |
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} |
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/**
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* Returns whether the list has exactly one element. |
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*/ |
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static inline bool list_is_singular(const struct list_head *list) |
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{ |
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return list_is_linked(list) && !list_is_empty(list) && list->next->next == list; |
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} |
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static inline unsigned list_length(const struct list_head *list) |
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{ |
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struct list_head *node; |
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unsigned length = 0; |
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for (node = list->next; node != list; node = node->next) |
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length++; |
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return length; |
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} |
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static inline void list_splice(struct list_head *src, struct list_head *dst) |
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{ |
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if (list_is_empty(src)) |
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return; |
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src->next->prev = dst; |
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src->prev->next = dst->next; |
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dst->next->prev = src->prev; |
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dst->next = src->next; |
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} |
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static inline void list_splicetail(struct list_head *src, struct list_head *dst) |
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{ |
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if (list_is_empty(src)) |
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return; |
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src->prev->next = dst; |
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src->next->prev = dst->prev; |
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dst->prev->next = src->next; |
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dst->prev = src->prev; |
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} |
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static inline void list_validate(const struct list_head *list) |
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{ |
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struct list_head *node; |
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assert(list_is_linked(list)); |
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assert(list->next->prev == list && list->prev->next == list); |
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for (node = list->next; node != list; node = node->next) |
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assert(node->next->prev == node && node->prev->next == node); |
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} |
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#define LIST_ENTRY(__type, __item, __field) \ |
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((__type *)(((char *)(__item)) - offsetof(__type, __field))) |
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/**
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* Cast from a pointer to a member of a struct back to the containing struct. |
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* |
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* 'sample' MUST be initialized, or else the result is undefined! |
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*/ |
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#define list_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_first_entry(ptr, type, member) \ |
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LIST_ENTRY(type, (ptr)->next, member) |
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#define list_last_entry(ptr, type, member) \ |
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LIST_ENTRY(type, (ptr)->prev, member) |
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#define LIST_FOR_EACH_ENTRY(pos, head, member) \ |
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for (pos = NULL, pos = list_container_of((head)->next, pos, member); \
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&pos->member != (head); \
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pos = list_container_of(pos->member.next, pos, member)) |
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#define LIST_FOR_EACH_ENTRY_SAFE(pos, storage, head, member) \ |
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for (pos = NULL, pos = list_container_of((head)->next, pos, member), \
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storage = list_container_of(pos->member.next, pos, member); \
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&pos->member != (head); \
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pos = storage, storage = list_container_of(storage->member.next, storage, member)) |
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#define LIST_FOR_EACH_ENTRY_SAFE_REV(pos, storage, head, member) \ |
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for (pos = NULL, pos = list_container_of((head)->prev, pos, member), \
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storage = list_container_of(pos->member.prev, pos, member); \
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&pos->member != (head); \
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pos = storage, storage = list_container_of(storage->member.prev, storage, member)) |
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#define LIST_FOR_EACH_ENTRY_FROM(pos, start, head, member) \ |
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for (pos = NULL, pos = list_container_of((start), pos, member); \
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&pos->member != (head); \
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pos = list_container_of(pos->member.next, pos, member)) |
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#define LIST_FOR_EACH_ENTRY_FROM_REV(pos, start, head, member) \ |
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for (pos = NULL, pos = list_container_of((start), pos, member); \
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&pos->member != (head); \
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pos = list_container_of(pos->member.prev, pos, member)) |
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#define list_for_each_entry(type, pos, head, member) \ |
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for (type *pos = LIST_ENTRY(type, (head)->next, member), \
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*__next = LIST_ENTRY(type, pos->member.next, member); \
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&pos->member != (head); \
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pos = LIST_ENTRY(type, pos->member.next, member), \
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list_assert(pos == __next, "use _safe iterator"), \
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__next = LIST_ENTRY(type, __next->member.next, member)) |
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#define list_for_each_entry_safe(type, pos, head, member) \ |
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for (type *pos = LIST_ENTRY(type, (head)->next, member), \
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*__next = LIST_ENTRY(type, pos->member.next, member); \
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&pos->member != (head); \
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pos = __next, \
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__next = LIST_ENTRY(type, __next->member.next, member)) |
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#define list_for_each_entry_rev(type, pos, head, member) \ |
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for (type *pos = LIST_ENTRY(type, (head)->prev, member), \
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*__prev = LIST_ENTRY(type, pos->member.prev, member); \
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&pos->member != (head); \
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pos = LIST_ENTRY(type, pos->member.prev, member), \
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list_assert(pos == __prev, "use _safe iterator"), \
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__prev = LIST_ENTRY(type, __prev->member.prev, member)) |
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#define list_for_each_entry_safe_rev(type, pos, head, member) \ |
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for (type *pos = LIST_ENTRY(type, (head)->prev, member), \
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*__prev = LIST_ENTRY(type, pos->member.prev, member); \
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&pos->member != (head); \
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pos = __prev, \
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__prev = LIST_ENTRY(type, __prev->member.prev, member)) |
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#define list_for_each_entry_from(type, pos, start, head, member) \ |
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for (type *pos = LIST_ENTRY(type, (start), member); \
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&pos->member != (head); \
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pos = LIST_ENTRY(type, pos->member.next, member)) |
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#define list_for_each_entry_from_safe(type, pos, start, head, member) \ |
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for (type *pos = LIST_ENTRY(type, (start), member), \
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*__next = LIST_ENTRY(type, pos->member.next, member); \
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&pos->member != (head); \
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pos = __next, \
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__next = LIST_ENTRY(type, __next->member.next, member)) |
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#define list_for_each_entry_from_rev(type, pos, start, head, member) \ |
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for (type *pos = LIST_ENTRY(type, (start), member); \
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&pos->member != (head); \
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pos = LIST_ENTRY(type, pos->member.prev, member)) |
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#define list_pair_for_each_entry(type, pos1, pos2, head1, head2, member) \ |
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for (type *pos1 = LIST_ENTRY(type, (head1)->next, member), \
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*pos2 = LIST_ENTRY(type, (head2)->next, member); \
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&pos1->member != (head1) && &pos2->member != (head2); \
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pos1 = LIST_ENTRY(type, pos1->member.next, member), \
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pos2 = LIST_ENTRY(type, pos2->member.next, member)) |
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#endif /*_UTIL_LIST_H_*/ |
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