91 lines
2.3 KiB
C
91 lines
2.3 KiB
C
#ifndef LIST_H
|
|
#define LIST_H
|
|
|
|
/*
|
|
* Copied from include/linux/...
|
|
*/
|
|
|
|
#undef offsetof
|
|
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
|
|
|
|
/**
|
|
* container_of - cast a member of a structure out to the containing structure
|
|
* @ptr: the pointer to the member.
|
|
* @type: the type of the container struct this is embedded in.
|
|
* @member: the name of the member within the struct.
|
|
*
|
|
*/
|
|
#define container_of(ptr, type, member) ({ \
|
|
const typeof( ((type *)0)->member ) *__mptr = (ptr); \
|
|
(type *)( (char *)__mptr - offsetof(type,member) );})
|
|
|
|
|
|
struct list_head {
|
|
struct list_head *next, *prev;
|
|
};
|
|
|
|
|
|
#define LIST_HEAD_INIT(name) { &(name), &(name) }
|
|
|
|
#define LIST_HEAD(name) \
|
|
struct list_head name = LIST_HEAD_INIT(name)
|
|
|
|
/**
|
|
* list_entry - get the struct for this entry
|
|
* @ptr: the &struct list_head pointer.
|
|
* @type: the type of the struct this is embedded in.
|
|
* @member: the name of the list_struct within the struct.
|
|
*/
|
|
#define list_entry(ptr, type, member) \
|
|
container_of(ptr, type, member)
|
|
|
|
/**
|
|
* list_for_each_entry - iterate over list of given type
|
|
* @pos: the type * to use as a loop cursor.
|
|
* @head: the head for your list.
|
|
* @member: the name of the list_struct within the struct.
|
|
*/
|
|
#define list_for_each_entry(pos, head, member) \
|
|
for (pos = list_entry((head)->next, typeof(*pos), member); \
|
|
&pos->member != (head); \
|
|
pos = list_entry(pos->member.next, typeof(*pos), member))
|
|
|
|
/**
|
|
* list_empty - tests whether a list is empty
|
|
* @head: the list to test.
|
|
*/
|
|
static inline int list_empty(const struct list_head *head)
|
|
{
|
|
return head->next == head;
|
|
}
|
|
|
|
/*
|
|
* Insert a new entry between two known consecutive entries.
|
|
*
|
|
* This is only for internal list manipulation where we know
|
|
* the prev/next entries already!
|
|
*/
|
|
static inline void __list_add(struct list_head *_new,
|
|
struct list_head *prev,
|
|
struct list_head *next)
|
|
{
|
|
next->prev = _new;
|
|
_new->next = next;
|
|
_new->prev = prev;
|
|
prev->next = _new;
|
|
}
|
|
|
|
/**
|
|
* list_add_tail - add a new entry
|
|
* @new: new entry to be added
|
|
* @head: list head to add it before
|
|
*
|
|
* Insert a new entry before the specified head.
|
|
* This is useful for implementing queues.
|
|
*/
|
|
static inline void list_add_tail(struct list_head *_new, struct list_head *head)
|
|
{
|
|
__list_add(_new, head->prev, head);
|
|
}
|
|
|
|
#endif
|