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88 lines
2.9 KiB
88 lines
2.9 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* Generic associative array implementation. |
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* |
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* See Documentation/core-api/assoc_array.rst for information. |
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* |
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* Copyright (C) 2013 Red Hat, Inc. All Rights Reserved. |
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* Written by David Howells ([email protected]) |
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*/ |
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#ifndef _LINUX_ASSOC_ARRAY_H |
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#define _LINUX_ASSOC_ARRAY_H |
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#ifdef CONFIG_ASSOCIATIVE_ARRAY |
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#include <linux/types.h> |
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#define ASSOC_ARRAY_KEY_CHUNK_SIZE BITS_PER_LONG /* Key data retrieved in chunks of this size */ |
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/* |
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* Generic associative array. |
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*/ |
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struct assoc_array { |
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struct assoc_array_ptr *root; /* The node at the root of the tree */ |
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unsigned long nr_leaves_on_tree; |
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}; |
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/* |
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* Operations on objects and index keys for use by array manipulation routines. |
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*/ |
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struct assoc_array_ops { |
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/* Method to get a chunk of an index key from caller-supplied data */ |
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unsigned long (*get_key_chunk)(const void *index_key, int level); |
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/* Method to get a piece of an object's index key */ |
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unsigned long (*get_object_key_chunk)(const void *object, int level); |
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/* Is this the object we're looking for? */ |
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bool (*compare_object)(const void *object, const void *index_key); |
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/* How different is an object from an index key, to a bit position in |
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* their keys? (or -1 if they're the same) |
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*/ |
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int (*diff_objects)(const void *object, const void *index_key); |
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/* Method to free an object. */ |
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void (*free_object)(void *object); |
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}; |
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/* |
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* Access and manipulation functions. |
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*/ |
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struct assoc_array_edit; |
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static inline void assoc_array_init(struct assoc_array *array) |
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{ |
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array->root = NULL; |
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array->nr_leaves_on_tree = 0; |
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} |
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extern int assoc_array_iterate(const struct assoc_array *array, |
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int (*iterator)(const void *object, |
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void *iterator_data), |
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void *iterator_data); |
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extern void *assoc_array_find(const struct assoc_array *array, |
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const struct assoc_array_ops *ops, |
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const void *index_key); |
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extern void assoc_array_destroy(struct assoc_array *array, |
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const struct assoc_array_ops *ops); |
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extern struct assoc_array_edit *assoc_array_insert(struct assoc_array *array, |
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const struct assoc_array_ops *ops, |
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const void *index_key, |
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void *object); |
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extern void assoc_array_insert_set_object(struct assoc_array_edit *edit, |
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void *object); |
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extern struct assoc_array_edit *assoc_array_delete(struct assoc_array *array, |
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const struct assoc_array_ops *ops, |
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const void *index_key); |
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extern struct assoc_array_edit *assoc_array_clear(struct assoc_array *array, |
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const struct assoc_array_ops *ops); |
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extern void assoc_array_apply_edit(struct assoc_array_edit *edit); |
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extern void assoc_array_cancel_edit(struct assoc_array_edit *edit); |
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extern int assoc_array_gc(struct assoc_array *array, |
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const struct assoc_array_ops *ops, |
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bool (*iterator)(void *object, void *iterator_data), |
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void *iterator_data); |
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#endif /* CONFIG_ASSOCIATIVE_ARRAY */ |
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#endif /* _LINUX_ASSOC_ARRAY_H */
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