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-/*
- * Copyright © 2010 Intel Corporation
- * Copyright © 2010 Francisco Jerez <currojerez@riseup.net>
- *
- * 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 (including the next
- * paragraph) 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
-
-/**
- * @file Classic doubly-link circular list implementation.
- * For real usage examples of the linked list, see the file test/list.c
- *
- * Example:
- * We need to keep a list of struct foo in the parent struct bar, i.e. what
- * we want is something like this.
- *
- *     struct bar {
- *          ...
- *          struct foo *list_of_foos; -----> struct foo {}, struct foo {}, struct foo{}
- *          ...
- *     }
- *
- * We need one list head in bar and a list element in all list_of_foos (both are of
- * data type 'struct list').
- *
- *     struct bar {
- *          ...
- *          struct list list_of_foos;
- *          ...
- *     }
- *
- *     struct foo {
- *          ...
- *          struct list entry;
- *          ...
- *     }
- *
- * Now we initialize the list head:
- *
- *     struct bar bar;
- *     ...
- *     list_init(&bar.list_of_foos);
- *
- * Then we create the first element and add it to this list:
- *
- *     struct foo *foo = malloc(...);
- *     ....
- *     list_add(&foo->entry, &bar.list_of_foos);
- *
- * Repeat the above for each element you want to add to the list. Deleting
- * works with the element itself.
- *      list_del(&foo->entry);
- *      free(foo);
- *
- * Note: calling list_del(&bar.list_of_foos) will set bar.list_of_foos to an empty
- * list again.
- *
- * Looping through the list requires a 'struct foo' as iterator and the
- * name of the field the subnodes use.
- *
- * struct foo *iterator;
- * list_foreach(iterator, &bar.list_of_foos, entry) {
- *      if (iterator->something == ...)
- *             ...
- * }
- *
- * Note: You must not call list_del() on the iterator if you continue the
- * loop. You need to run the safe for-each loop instead:
- *
- * struct foo *iterator, *next;
- * list_foreach_safe(iterator, next, &bar.list_of_foos, entry) {
- *      if (...)
- *              list_del(&iterator->entry);
- * }
- *
- */
-
-/**
- * The linkage struct for list nodes. This struct must be part of your
- * to-be-linked struct. struct list is required for both the head of the
- * list and for each list node.
- *
- * Position and name of the struct list field is irrelevant.
- * There are no requirements that elements of a list are of the same type.
- * There are no requirements for a list head, any struct list can be a list
- * head.
- */
-struct list {
-    struct list *next, *prev;
-};
-
-/**
- * Initialize the list as an empty list.
- *
- * Example:
- * list_init(&bar->list_of_foos);
- *
- * @param The list to initialized.
- */
-static void
-list_init(struct list *list)
-{
-    list->next = list->prev = list;
-}
-
-static inline void
-__list_add(struct list *entry,
-                struct list *prev, struct list *next)
-{
-    next->prev = entry;
-    entry->next = next;
-    entry->prev = prev;
-    prev->next = entry;
-}
-
-/**
- * Insert a new element after the given list head. The new element does not
- * need to be initialised as empty list.
- * The list changes from:
- *      head → some element → ...
- * to
- *      head → new element → older element → ...
- *
- * Example:
- * struct foo *newfoo = malloc(...);
- * list_add(&newfoo->entry, &bar->list_of_foos);
- *
- * @param entry The new element to prepend to the list.
- * @param head The existing list.
- */
-static inline void
-list_add(struct list *entry, struct list *head)
-{
-    __list_add(entry, head, head->next);
-}
-
-/**
- * Append a new element to the end of the list given with this list head.
- *
- * The list changes from:
- *      head → some element → ... → lastelement
- * to
- *      head → some element → ... → lastelement → new element
- *
- * Example:
- * struct foo *newfoo = malloc(...);
- * list_append(&newfoo->entry, &bar->list_of_foos);
- *
- * @param entry The new element to prepend to the list.
- * @param head The existing list.
- */
-static inline void
-list_append(struct list *entry, struct list *head)
-{
-    __list_add(entry, head->prev, head);
-}
-
-static inline void
-__list_del(struct list *prev, struct list *next)
-{
-    next->prev = prev;
-    prev->next = next;
-}
-
-/**
- * Remove the element from the list it is in. Using this function will reset
- * the pointers to/from this element so it is removed from the list. It does
- * NOT free the element itself or manipulate it otherwise.
- *
- * Using list_del on a pure list head (like in the example at the top of
- * this file) will NOT remove the first element from
- * the list but rather reset the list as empty list.
- *
- * Example:
- * list_del(&foo->entry);
- *
- * @param entry The element to remove.
- */
-static inline void
-list_del(struct list *entry)
-{
-    __list_del(entry->prev, entry->next);
-    list_init(entry);
-}
-
-/**
- * Check if the list is empty.
- *
- * Example:
- * list_empty(&bar->list_of_foos);
- *
- * @return True if the list contains one or more elements or False otherwise.
- */
-static inline bool
-list_empty(struct list *head)
-{
-    return head->next == head;
-}
-
-/**
- * Replace a list element by another one. This can also be used to replace
- * the head of an existing list by another list head.
- *
- * Example:
- * list_replace(&object_foo->entry, &object_bar->entry);
- * list_replace(&from->list_head, &into->list_head);
- *
- * @param old The element being replaced.
- * @param new The element to replace @old with.
- */
-static inline void
-list_replace(struct list *old, struct list *new)
-{
-    new->next = old->next;
-    new->next->prev = new;
-    new->prev = old->prev;
-    new->prev->next = new;
-}
-
-/**
- * Returns a pointer to the container of this list element.
- *
- * Example:
- * struct foo* f;
- * f = container_of(&foo->entry, struct foo, entry);
- * assert(f == foo);
- *
- * @param ptr Pointer to the struct list.
- * @param type Data type of the list element.
- * @param member Member name of the struct list field in the list element.
- * @return A pointer to the data struct containing the list head.
- */
-#ifndef container_of
-#define container_of(ptr, type, member) \
-    (type *)((char *)(ptr) - (char *) &((type *)0)->member)
-#endif
-
-/**
- * Alias of container_of
- */
-#define list_entry(ptr, type, member) \
-    container_of(ptr, type, member)
-
-/**
- * Retrieve the first list entry for the given list pointer.
- *
- * Example:
- * struct foo *first;
- * first = list_first_entry(&bar->list_of_foos, struct foo, list_of_foos);
- *
- * @param ptr The list head
- * @param type Data type of the list element to retrieve
- * @param member Member name of the struct list field in the list element.
- * @return A pointer to the first list element.
- */
-#define list_first_entry(ptr, type, member) \
-    list_entry((ptr)->next, type, member)
-
-/**
- * Retrieve the last list entry for the given listpointer.
- *
- * Example:
- * struct foo *first;
- * first = list_last_entry(&bar->list_of_foos, struct foo, list_of_foos);
- *
- * @param ptr The list head
- * @param type Data type of the list element to retrieve
- * @param member Member name of the struct list field in the list element.
- * @return A pointer to the last list element.
- */
-#define list_last_entry(ptr, type, member) \
-    list_entry((ptr)->prev, type, member)
-
-#define __container_of(ptr, sample, member)				\
-    (void *)((char *)(ptr)						\
-	     - offsetof(__typeof(*sample), member))
-/**
- * Loop through the list given by head and set pos to struct in the list.
- *
- * Example:
- * struct foo *iterator;
- * list_foreach(iterator, &bar->list_of_foos, entry) {
- *      [modify iterator]
- * }
- *
- * This macro is not safe for node deletion. Use list_foreach_safe
- * instead.
- *
- * @param pos Iterator variable of the type of the list elements.
- * @param head List head
- * @param member Member name of the struct list in the list elements.
- *
- */
-#define list_foreach(pos, head, member)				        \
-    for (pos = __container_of((head)->next, pos, member);		\
-	 &pos->member != (head);					\
-	 pos = __container_of(pos->member.next, pos, member))
-
-/**
- * Loop through the list, keeping a backup pointer to the element. This
- * macro allows for the deletion of a list element while looping through the
- * list.
- *
- * See list_foreach for more details.
- */
-#define list_foreach_safe(pos, tmp, head, member)		        \
-    for (pos = __container_of((head)->next, pos, member),		\
-	 tmp = __container_of(pos->member.next, pos, member);		\
-	 &pos->member != (head);					\
-	 pos = tmp, tmp = __container_of(pos->member.next, tmp, member))
-
-/* NULL-Terminated List Interface
- *
- * The interface below does _not_ use the struct list as described above.
- * It is mainly for legacy structures that cannot easily be switched to
- * struct list.
- *
- * This interface is for structs like
- *      struct foo {
- *          [...]
- *          struct foo *next;
- *           [...]
- *      };
- *
- * The position and field name of "next" are arbitrary.
- */
-
-/**
- * Init the element as null-terminated list.
- *
- * Example:
- * struct foo *list = malloc();
- * nt_list_init(list, next);
- *
- * @param list The list element that will be the start of the list
- * @param member Member name of the field pointing to next struct
- */
-#define nt_list_init(_list, _member) \
-	(_list)->_member = NULL
-
-/**
- * Returns the next element in the list or NULL on termination.
- *
- * Example:
- * struct foo *element = list;
- * while ((element = nt_list_next(element, next)) { }
- *
- * This macro is not safe for node deletion. Use list_foreach_safe
- * instead.
- *
- * @param list The list or current element.
- * @param member Member name of the field pointing to next struct.
- */
-#define nt_list_next(_list, _member) \
-	(_list)->_member
-
-/**
- * Iterate through each element in the list.
- *
- * Example:
- * struct foo *iterator;
- * nt_list_foreach(iterator, list, next) {
- *      [modify iterator]
- * }
- *
- * @param entry Assigned to the current list element
- * @param list The list to iterate through.
- * @param member Member name of the field pointing to next struct.
- */
-#define nt_list_foreach(_entry, _list, _member)			\
-	for (_entry = _list; _entry; _entry = (_entry)->_member)
-
-/**
- * Iterate through each element in the list, keeping a backup pointer to the
- * element. This macro allows for the deletion of a list element while
- * looping through the list.
- *
- * See nt_list_foreach for more details.
- *
- * @param entry Assigned to the current list element
- * @param tmp The pointer to the next element
- * @param list The list to iterate through.
- * @param member Member name of the field pointing to next struct.
- */
-#define nt_list_foreach_safe(_entry, _tmp, _list, _member)	\
-	for (_entry = _list, _tmp = (_entry) ? (_entry)->_member : NULL;\
-		_entry;							\
-		_entry = _tmp, _tmp = (_tmp) ? (_tmp)->_member: NULL)
-
-/**
- * Append the element to the end of the list. This macro may be used to
- * merge two lists.
- *
- * Example:
- * struct foo *elem = malloc(...);
- * nt_list_init(elem, next)
- * nt_list_append(elem, list, struct foo, next);
- *
- * Resulting list order:
- * list_item_0 -> list_item_1 -> ... -> elem_item_0 -> elem_item_1 ...
- *
- * @param entry An entry (or list) to append to the list
- * @param list The list to append to. This list must be a valid list, not
- * NULL.
- * @param type The list type
- * @param member Member name of the field pointing to next struct
- */
-#define nt_list_append(_entry, _list, _type, _member)		        \
-    do {								\
-	_type *__iterator = _list;					\
-	while (__iterator->_member) { __iterator = __iterator->_member;}\
-	__iterator->_member = _entry;					\
-    } while (0)
-
-/**
- * Insert the element at the next position in the list. This macro may be
- * used to insert a list into a list.
- *
- * struct foo *elem = malloc(...);
- * nt_list_init(elem, next)
- * nt_list_insert(elem, list, struct foo, next);
- *
- * Resulting list order:
- * list_item_0 -> elem_item_0 -> elem_item_1 ... -> list_item_1 -> ...
- *
- * @param entry An entry (or list) to append to the list
- * @param list The list to insert to. This list must be a valid list, not
- * NULL.
- * @param type The list type
- * @param member Member name of the field pointing to next struct
- */
-#define nt_list_insert(_entry, _list, _type, _member)			\
-    do {								\
-	nt_list_append((_list)->_member, _entry, _type, _member);	\
-	(_list)->_member = _entry;					\
-    } while (0)
-
-/**
- * Delete the entry from the list by iterating through the list and
- * removing any reference from the list to the entry.
- *
- * Example:
- * struct foo *elem = <assign to right element>
- * nt_list_del(elem, list, struct foo, next);
- *
- * @param entry The entry to delete from the list. entry is always
- * re-initialized as a null-terminated list.
- * @param list The list containing the entry, set to the new list without
- * the removed entry.
- * @param type The list type
- * @param member Member name of the field pointing to the next entry
- */
-#define nt_list_del(_entry, _list, _type, _member)		\
-	do {							\
-		_type *__e = _entry;				\
-		if (__e == NULL || _list == NULL) break;        \
-		if ((_list) == __e) {				\
-		    _list = __e->_member;			\
-		} else {					\
-		    _type *__prev = _list;			\
-		    while (__prev->_member && __prev->_member != __e)	\
-			__prev = nt_list_next(__prev, _member);	\
-		    if (__prev->_member)			\
-			__prev->_member = __e->_member;		\
-		}						\
-		nt_list_init(__e, _member);			\
-	} while(0)
-
-#endif