93 lines
3.1 KiB
C
93 lines
3.1 KiB
C
|
/* Generic associative array implementation.
|
||
|
|
*
|
||
|
|
* See Documentation/core-api/assoc_array.rst for information.
|
||
|
|
*
|
||
|
|
* Copyright (C) 2013 Red Hat, Inc. All Rights Reserved.
|
||
|
|
* Written by David Howells (dhowells@redhat.com)
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the GNU General Public Licence
|
||
|
|
* as published by the Free Software Foundation; either version
|
||
|
|
* 2 of the Licence, or (at your option) any later version.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef _LINUX_ASSOC_ARRAY_H
|
||
|
|
#define _LINUX_ASSOC_ARRAY_H
|
||
|
|
|
||
|
|
#ifdef CONFIG_ASSOCIATIVE_ARRAY
|
||
|
|
|
||
|
|
#include <linux/types.h>
|
||
|
|
|
||
|
|
#define ASSOC_ARRAY_KEY_CHUNK_SIZE BITS_PER_LONG /* Key data retrieved in chunks of this size */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Generic associative array.
|
||
|
|
*/
|
||
|
|
struct assoc_array {
|
||
|
|
struct assoc_array_ptr *root; /* The node at the root of the tree */
|
||
|
|
unsigned long nr_leaves_on_tree;
|
||
|
|
};
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Operations on objects and index keys for use by array manipulation routines.
|
||
|
|
*/
|
||
|
|
struct assoc_array_ops {
|
||
|
|
/* Method to get a chunk of an index key from caller-supplied data */
|
||
|
|
unsigned long (*get_key_chunk)(const void *index_key, int level);
|
||
|
|
|
||
|
|
/* Method to get a piece of an object's index key */
|
||
|
|
unsigned long (*get_object_key_chunk)(const void *object, int level);
|
||
|
|
|
||
|
|
/* Is this the object we're looking for? */
|
||
|
|
bool (*compare_object)(const void *object, const void *index_key);
|
||
|
|
|
||
|
|
/* How different is an object from an index key, to a bit position in
|
||
|
|
* their keys? (or -1 if they're the same)
|
||
|
|
*/
|
||
|
|
int (*diff_objects)(const void *object, const void *index_key);
|
||
|
|
|
||
|
|
/* Method to free an object. */
|
||
|
|
void (*free_object)(void *object);
|
||
|
|
};
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Access and manipulation functions.
|
||
|
|
*/
|
||
|
|
struct assoc_array_edit;
|
||
|
|
|
||
|
|
static inline void assoc_array_init(struct assoc_array *array)
|
||
|
|
{
|
||
|
|
array->root = NULL;
|
||
|
|
array->nr_leaves_on_tree = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
extern int assoc_array_iterate(const struct assoc_array *array,
|
||
|
|
int (*iterator)(const void *object,
|
||
|
|
void *iterator_data),
|
||
|
|
void *iterator_data);
|
||
|
|
extern void *assoc_array_find(const struct assoc_array *array,
|
||
|
|
const struct assoc_array_ops *ops,
|
||
|
|
const void *index_key);
|
||
|
|
extern void assoc_array_destroy(struct assoc_array *array,
|
||
|
|
const struct assoc_array_ops *ops);
|
||
|
|
extern struct assoc_array_edit *assoc_array_insert(struct assoc_array *array,
|
||
|
|
const struct assoc_array_ops *ops,
|
||
|
|
const void *index_key,
|
||
|
|
void *object);
|
||
|
|
extern void assoc_array_insert_set_object(struct assoc_array_edit *edit,
|
||
|
|
void *object);
|
||
|
|
extern struct assoc_array_edit *assoc_array_delete(struct assoc_array *array,
|
||
|
|
const struct assoc_array_ops *ops,
|
||
|
|
const void *index_key);
|
||
|
|
extern struct assoc_array_edit *assoc_array_clear(struct assoc_array *array,
|
||
|
|
const struct assoc_array_ops *ops);
|
||
|
|
extern void assoc_array_apply_edit(struct assoc_array_edit *edit);
|
||
|
|
extern void assoc_array_cancel_edit(struct assoc_array_edit *edit);
|
||
|
|
extern int assoc_array_gc(struct assoc_array *array,
|
||
|
|
const struct assoc_array_ops *ops,
|
||
|
|
bool (*iterator)(void *object, void *iterator_data),
|
||
|
|
void *iterator_data);
|
||
|
|
|
||
|
|
#endif /* CONFIG_ASSOCIATIVE_ARRAY */
|
||
|
|
#endif /* _LINUX_ASSOC_ARRAY_H */
|