425 lines
12 KiB
C
425 lines
12 KiB
C
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/**
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* list.h Copied from the Linux kernel source tree
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*
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* Implement doubly linked list (list_head)
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*
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* Licensed under the GPL v2 as per the whole kernel source tree.
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*
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*/
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#ifndef _LIB_LIST_H_
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#define _LIB_LIST_H_
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#include <stddef.h>
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/*!
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* container_of - cast a member of a descriptor out to the containing descriptor
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*
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* @ptr: the pointer to the member.
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* @type: the type of the container struct this is embedded in.
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* @member: the name of the member within the struct.
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*
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*/
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#define container_of(ptr, type, member) ({ \
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typeof( ((type *)0)->member ) *__mptr = (ptr); \
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(type *)( (char *)__mptr - offsetof(type,member) );})
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/*!
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* These are non-NULL pointers that will result in page faults
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* under normal circumstances, used to verify that nobody uses
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* non-initialized list entries.
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*/
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#define LIST_POISON1 ((void *) 0x00100100)
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#define LIST_POISON2 ((void *) 0x00200200)
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/*!
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* Simple doubly linked list implementation.
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*
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* Some of the internal functions ("__xxx") are useful when
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* manipulating whole lists rather than single entries, as
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* sometimes we already know the next/prev entries and we can
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* generate better code by using them directly rather than
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* using the generic single-entry routines.
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*/
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struct list_head {
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struct list_head *next, *prev;
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};
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#define LIST_HEAD_INIT(name) { &(name), &(name) }
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#define LIST_HEAD(name) \
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struct list_head name = LIST_HEAD_INIT(name)
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static inline void INIT_LIST_HEAD(struct list_head *list)
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{
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list->next = list;
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list->prev = list;
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}
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/*!
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* Insert a new entry between two known consecutive entries.
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*
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* This is only for internal list manipulation where we know
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* the prev/next entries already!
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*/
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static inline void
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__list_add(struct list_head *new,
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struct list_head *prev, struct list_head *next)
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{
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next->prev = new;
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new->next = next;
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new->prev = prev;
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prev->next = new;
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}
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/*!
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* list_add - add a new entry
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* @new: new entry to be added
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* @head: list head to add it after
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*
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* Insert a new entry after the specified head.
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* This is good for implementing stacks.
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*/
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static inline void list_add(struct list_head *new, struct list_head *head)
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{
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__list_add(new, head, head->next);
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}
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/*!
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* list_add_tail - add a new entry
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* @new: new entry to be added
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* @head: list head to add it before
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*
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* Insert a new entry before the specified head.
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* This is useful for implementing queues.
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*/
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static inline void list_add_tail(struct list_head *new, struct list_head *head)
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{
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__list_add(new, head->prev, head);
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}
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/*!
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* Delete a list entry by making the prev/next entries
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* point to each other.
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*
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* This is only for internal list manipulation where we know
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* the prev/next entries already!
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*/
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static inline void __list_del(struct list_head *prev, struct list_head *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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/*!
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* list_del - deletes entry from list.
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* @entry: the element to delete from the list.
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* Note: list_empty on entry does not return true after this, the entry is
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* in an undefined state.
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*/
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static inline void list_del(struct list_head *entry)
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{
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__list_del(entry->prev, entry->next);
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entry->next = LIST_POISON1;
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entry->prev = LIST_POISON2;
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}
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/*!
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* list_del_init - deletes entry from list and reinitialize it.
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* @entry: the element to delete from the list.
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*/
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static inline void list_del_init(struct list_head *entry)
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{
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__list_del(entry->prev, entry->next);
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INIT_LIST_HEAD(entry);
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}
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/**
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* list_replace - replace old entry by new one
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* @old : the element to be replaced
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* @new : the new element to insert
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*
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* If @old was empty, it will be overwritten.
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*/
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static inline void list_replace(struct list_head *old, struct list_head *new)
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{
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new->next = old->next;
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new->next->prev = new;
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new->prev = old->prev;
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new->prev->next = new;
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}
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static inline void
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list_replace_init(struct list_head *old, struct list_head *new)
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{
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list_replace(old, new);
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INIT_LIST_HEAD(old);
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}
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/*!
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* list_swap - swap elements from list
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* @a: the entry to move to a
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* @b: the entry to move to b
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*/
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static inline void list_swap(struct list_head *a, struct list_head *b)
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{
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if (a->next == b) {
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list_replace(a, b);
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list_add(b, a);
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}
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else if (a->prev == b) {
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list_replace(b, a);
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list_add(a, b);
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}
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else {
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struct list_head tmp;
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tmp.next = b->next;
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tmp.prev = b->prev;
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list_replace(a, b);
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list_replace(&tmp, a);
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}
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}
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/*!
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* list_move - delete from one list and add as another's head
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* @list: the entry to move
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* @head: the head that will precede our entry
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*/
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static inline void list_move(struct list_head *list, struct list_head *head)
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{
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__list_del(list->prev, list->next);
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list_add(list, head);
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}
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/*!
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* list_move_tail - delete from one list and add as another's tail
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* @list: the entry to move
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* @head: the head that will follow our entry
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*/
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static inline void
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list_move_tail(struct list_head *list, struct list_head *head)
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{
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__list_del(list->prev, list->next);
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list_add_tail(list, head);
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}
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/**
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* list_is_last - tests whether @list is the last entry in list @head
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* @list: the entry to test
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* @head: the head of the list
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*/
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static inline int
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list_is_last(const struct list_head *list, const struct list_head *head)
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{
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return list->next == head;
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}
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/*!
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* list_empty - tests whether a list is empty
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* @head: the list to test.
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*/
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static inline int list_empty(struct list_head const *head)
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{
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return head->next == head;
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}
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static inline void __list_splice(struct list_head *list, struct list_head *head)
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{
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struct list_head *first = list->next;
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struct list_head *last = list->prev;
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struct list_head *at = head->next;
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first->prev = head;
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head->next = first;
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last->next = at;
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at->prev = last;
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}
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/*!
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* list_splice - join two lists
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* @list: the new list to add.
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* @head: the place to add it in the first list.
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*/
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static inline void list_splice(struct list_head *list, struct list_head *head)
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{
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if (!list_empty(list))
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__list_splice(list, head);
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}
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/*!
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* list_splice_init - join two lists and reinitialise the emptied list.
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* @list: the new list to add.
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* @head: the place to add it in the first list.
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*
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* The list at @list is reinitialised
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*/
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static inline void
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list_splice_init(struct list_head *list, struct list_head *head)
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{
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if (!list_empty(list)) {
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__list_splice(list, head);
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INIT_LIST_HEAD(list);
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}
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}
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/*!
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* list_entry - get the struct for this entry
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* @ptr: the &struct list_head pointer.
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* @type: the type of the struct this is embedded in.
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* @member: the name of the list_struct within the struct.
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*/
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#define list_entry(ptr, type, member) \
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container_of(ptr, type, member)
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/**
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* list_first_entry - get the first element from a list
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* @ptr: the list head to take the element from.
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* @type: the type of the struct this is embedded in.
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* @member: the name of the list_struct within the struct.
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*
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* Note, that list is expected to be not empty.
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*/
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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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/*!
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* list_for_each - iterate over a list
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* @pos: the &struct list_head to use as a loop counter.
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* @head: the head for your list.
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*/
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#define list_for_each(pos, head) \
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for (pos = (head)->next; pos != (head); pos = pos->next)
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/*!
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* list_for_each_prev - iterate over a list backwards
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* @pos: the &struct list_head to use as a loop counter.
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* @head: the head for your list.
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*/
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#define list_for_each_prev(pos, head) \
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for (pos = (head)->prev; pos != (head); pos = pos->prev)
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/*!
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* list_for_each_safe - iterate over a list safe against removal of list entry
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* @pos: the &struct list_head to use as a loop counter.
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* @n: another &struct list_head to use as temporary storage
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* @head: the head for your list.
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*/
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#define list_for_each_safe(pos, n, head) \
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for (pos = (head)->next, n = pos->next; pos != (head); \
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pos = n, n = pos->next)
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/*!
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* list_for_each_entry - iterate over list of given type
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* @pos: the type * to use as a loop counter.
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* @head: the head for your list.
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* @member: the name of the list_struct within the struct.
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*/
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#define list_for_each_entry(pos, head, member) \
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for (pos = list_entry((head)->next, typeof(*pos), member); \
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&pos->member != (head); \
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pos = list_entry(pos->member.next, typeof(*pos), member))
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/*!
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* list_for_each_entry_reverse - iterate backwards over list of given type.
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* @pos: the type * to use as a loop counter.
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* @head: the head for your list.
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* @member: the name of the list_struct within the struct.
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*/
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#define list_for_each_entry_reverse(pos, head, member) \
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for (pos = list_entry((head)->prev, typeof(*pos), member); \
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&pos->member != (head); \
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pos = list_entry(pos->member.prev, typeof(*pos), member))
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/**
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* list_for_each_entry_continue - continue iteration over list of given type
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* @pos: the type * to use as a loop cursor.
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* @head: the head for your list.
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* @member: the name of the list_struct within the struct.
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*
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* Continue to iterate over list of given type, continuing after
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* the current position.
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*/
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#define list_for_each_entry_continue(pos, head, member) \
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for (pos = list_entry(pos->member.next, typeof(*pos), member); \
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&pos->member != (head); \
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pos = list_entry(pos->member.next, typeof(*pos), member))
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/**
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* list_for_each_entry_from - iterate over list of given type from the current point
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* @pos: the type * to use as a loop cursor.
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* @head: the head for your list.
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* @member: the name of the list_struct within the struct.
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*
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* Iterate over list of given type, continuing from current position.
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*/
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#define list_for_each_entry_from(pos, head, member) \
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for (; &pos->member != (head); \
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pos = list_entry(pos->member.next, typeof(*pos), member))
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/*!
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* list_for_each_entry_safe - iterate over list of given type safe against removal of list entry
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* @pos: the type * to use as a loop counter.
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* @n: another type * to use as temporary storage
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* @head: the head for your list.
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* @member: the name of the list_struct within the struct.
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*/
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#define list_for_each_entry_safe(pos, n, head, member) \
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for (pos = list_entry((head)->next, typeof(*pos), member), \
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n = list_entry(pos->member.next, typeof(*pos), member); \
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&pos->member != (head); \
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pos = n, n = list_entry(n->member.next, typeof(*n), member))
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/**
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* list_for_each_entry_safe_continue
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* @pos: the type * to use as a loop cursor.
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* @n: another type * to use as temporary storage
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* @head: the head for your list.
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* @member: the name of the list_struct within the struct.
|
||
|
|
*
|
||
|
|
* Iterate over list of given type, continuing after current point,
|
||
|
|
* safe against removal of list entry.
|
||
|
|
*/
|
||
|
|
#define list_for_each_entry_safe_continue(pos, n, head, member) \
|
||
|
|
for (pos = list_entry(pos->member.next, typeof(*pos), member), \
|
||
|
|
n = list_entry(pos->member.next, typeof(*pos), member); \
|
||
|
|
&pos->member != (head); \
|
||
|
|
pos = n, n = list_entry(n->member.next, typeof(*n), member))
|
||
|
|
|
||
|
|
/**
|
||
|
|
* list_for_each_entry_safe_from
|
||
|
|
* @pos: the type * to use as a loop cursor.
|
||
|
|
* @n: another type * to use as temporary storage
|
||
|
|
* @head: the head for your list.
|
||
|
|
* @member: the name of the list_struct within the struct.
|
||
|
|
*
|
||
|
|
* Iterate over list of given type from current point, safe against
|
||
|
|
* removal of list entry.
|
||
|
|
*/
|
||
|
|
#define list_for_each_entry_safe_from(pos, n, head, member) \
|
||
|
|
for (n = list_entry(pos->member.next, typeof(*pos), member); \
|
||
|
|
&pos->member != (head); \
|
||
|
|
pos = n, n = list_entry(n->member.next, typeof(*n), member))
|
||
|
|
|
||
|
|
/**
|
||
|
|
* list_for_each_entry_safe_reverse
|
||
|
|
* @pos: the type * to use as a loop cursor.
|
||
|
|
* @n: another type * to use as temporary storage
|
||
|
|
* @head: the head for your list.
|
||
|
|
* @member: the name of the list_struct within the struct.
|
||
|
|
*
|
||
|
|
* Iterate backwards over list of given type, safe against removal
|
||
|
|
* of list entry.
|
||
|
|
*/
|
||
|
|
#define list_for_each_entry_safe_reverse(pos, n, head, member) \
|
||
|
|
for (pos = list_entry((head)->prev, typeof(*pos), member), \
|
||
|
|
n = list_entry(pos->member.prev, typeof(*pos), member); \
|
||
|
|
&pos->member != (head); \
|
||
|
|
pos = n, n = list_entry(n->member.prev, typeof(*n), member))
|
||
|
|
|
||
|
|
|
||
|
|
#endif /* _LIB_LIST_H_ */
|