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#ifndef BASE_DATA_STRUCT_LIST_H
#define BASE_DATA_STRUCT_LIST_H
#include "base/memory/container_of.h"
//----------------------------------------------------------------
/*
* A list consists of a list head plus elements.
* Each element has 'next' and 'previous' pointers.
* The list head's pointers point to the first and the last element.
*/
struct dm_list {
struct dm_list *n, *p;
};
/*
* String list.
*/
struct dm_str_list {
struct dm_list list;
const char *str;
};
/*
* Initialise a list before use.
* The list head's next and previous pointers point back to itself.
*/
#define DM_LIST_HEAD_INIT(name) { &(name), &(name) }
#define DM_LIST_INIT(name) struct dm_list name = DM_LIST_HEAD_INIT(name)
void dm_list_init(struct dm_list *head);
/*
* Insert an element before 'head'.
* If 'head' is the list head, this adds an element to the end of the list.
*/
void dm_list_add(struct dm_list *head, struct dm_list *elem);
/*
* Insert an element after 'head'.
* If 'head' is the list head, this adds an element to the front of the list.
*/
void dm_list_add_h(struct dm_list *head, struct dm_list *elem);
/*
* Delete an element from its list.
* Note that this doesn't change the element itself - it may still be safe
* to follow its pointers.
*/
void dm_list_del(struct dm_list *elem);
/*
* Remove an element from existing list and insert before 'head'.
*/
void dm_list_move(struct dm_list *head, struct dm_list *elem);
/*
* Join 'head1' to the end of 'head'.
*/
void dm_list_splice(struct dm_list *head, struct dm_list *head1);
/*
* Is the list empty?
*/
int dm_list_empty(const struct dm_list *head);
/*
* Is this the first element of the list?
*/
int dm_list_start(const struct dm_list *head, const struct dm_list *elem);
/*
* Is this the last element of the list?
*/
int dm_list_end(const struct dm_list *head, const struct dm_list *elem);
/*
* Return first element of the list or NULL if empty
*/
struct dm_list *dm_list_first(const struct dm_list *head);
/*
* Return last element of the list or NULL if empty
*/
struct dm_list *dm_list_last(const struct dm_list *head);
/*
* Return the previous element of the list, or NULL if we've reached the start.
*/
struct dm_list *dm_list_prev(const struct dm_list *head, const struct dm_list *elem);
/*
* Return the next element of the list, or NULL if we've reached the end.
*/
struct dm_list *dm_list_next(const struct dm_list *head, const struct dm_list *elem);
/*
* Given the address v of an instance of 'struct dm_list' called 'head'
* contained in a structure of type t, return the containing structure.
*/
#define dm_list_struct_base(v, t, head) \
container_of(v, t, head)
/*
* Given the address v of an instance of 'struct dm_list list' contained in
* a structure of type t, return the containing structure.
*/
#define dm_list_item(v, t) dm_list_struct_base((v), t, list)
/*
* Given the address v of one known element e in a known structure of type t,
* return another element f.
*/
#define dm_struct_field(v, t, e, f) \
(((t *)((uintptr_t)(v) - offsetof(t, e)))->f)
/*
* Given the address v of a known element e in a known structure of type t,
* return the list head 'list'
*/
#define dm_list_head(v, t, e) dm_struct_field(v, t, e, list)
/*
* Set v to each element of a list in turn.
*/
#define dm_list_iterate(v, head) \
for (v = (head)->n; v != head; v = v->n)
/*
* Set v to each element in a list in turn, starting from the element
* in front of 'start'.
* You can use this to 'unwind' a list_iterate and back out actions on
* already-processed elements.
* If 'start' is 'head' it walks the list backwards.
*/
#define dm_list_uniterate(v, head, start) \
for (v = (start)->p; v != head; v = v->p)
/*
* A safe way to walk a list and delete and free some elements along
* the way.
* t must be defined as a temporary variable of the same type as v.
*/
#define dm_list_iterate_safe(v, t, head) \
for (v = (head)->n, t = v->n; v != head; v = t, t = v->n)
/*
* Walk a list, setting 'v' in turn to the containing structure of each item.
* The containing structure should be the same type as 'v'.
* The 'struct dm_list' variable within the containing structure is 'field'.
*/
#define dm_list_iterate_items_gen(v, head, field) \
for (v = dm_list_struct_base((head)->n, __typeof__(*v), field); \
&v->field != (head); \
v = dm_list_struct_base(v->field.n, __typeof__(*v), field))
/*
* Walk a list, setting 'v' in turn to the containing structure of each item.
* The containing structure should be the same type as 'v'.
* The list should be 'struct dm_list list' within the containing structure.
*/
#define dm_list_iterate_items(v, head) dm_list_iterate_items_gen(v, (head), list)
/*
* Walk a list, setting 'v' in turn to the containing structure of each item.
* The containing structure should be the same type as 'v'.
* The 'struct dm_list' variable within the containing structure is 'field'.
* t must be defined as a temporary variable of the same type as v.
*/
#define dm_list_iterate_items_gen_safe(v, t, head, field) \
for (v = dm_list_struct_base((head)->n, __typeof__(*v), field), \
t = dm_list_struct_base(v->field.n, __typeof__(*v), field); \
&v->field != (head); \
v = t, t = dm_list_struct_base(v->field.n, __typeof__(*v), field))
/*
* Walk a list, setting 'v' in turn to the containing structure of each item.
* The containing structure should be the same type as 'v'.
* The list should be 'struct dm_list list' within the containing structure.
* t must be defined as a temporary variable of the same type as v.
*/
#define dm_list_iterate_items_safe(v, t, head) \
dm_list_iterate_items_gen_safe(v, t, (head), list)
/*
* Walk a list backwards, setting 'v' in turn to the containing structure
* of each item.
* The containing structure should be the same type as 'v'.
* The 'struct dm_list' variable within the containing structure is 'field'.
*/
#define dm_list_iterate_back_items_gen(v, head, field) \
for (v = dm_list_struct_base((head)->p, __typeof__(*v), field); \
&v->field != (head); \
v = dm_list_struct_base(v->field.p, __typeof__(*v), field))
/*
* Walk a list backwards, setting 'v' in turn to the containing structure
* of each item.
* The containing structure should be the same type as 'v'.
* The list should be 'struct dm_list list' within the containing structure.
*/
#define dm_list_iterate_back_items(v, head) dm_list_iterate_back_items_gen(v, (head), list)
/*
* Return the number of elements in a list by walking it.
*/
unsigned int dm_list_size(const struct dm_list *head);
//----------------------------------------------------------------
#endif
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