| 1 | /*
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| 2 | * Copyright (c) 2006 Jakub Jermar
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| 3 | * Copyright (c) 2011 Radim Vansa
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| 4 | * All rights reserved.
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| 5 | *
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| 6 | * Redistribution and use in source and binary forms, with or without
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| 7 | * modification, are permitted provided that the following conditions
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| 8 | * are met:
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| 9 | *
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| 10 | * - Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | * - Redistributions in binary form must reproduce the above copyright
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| 13 | * notice, this list of conditions and the following disclaimer in the
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| 14 | * documentation and/or other materials provided with the distribution.
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| 15 | * - The name of the author may not be used to endorse or promote products
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| 16 | * derived from this software without specific prior written permission.
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| 17 | *
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| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 28 | */
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| 29 |
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| 30 | /** @addtogroup libc
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| 31 | * @{
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| 32 | */
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| 33 | /** @file
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| 34 | */
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| 35 |
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| 36 | #ifndef LIBC_HASH_SET_H_
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| 37 | #define LIBC_HASH_SET_H_
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| 38 |
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| 39 | #include <adt/list.h>
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| 40 | #include <unistd.h>
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| 41 |
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| 42 | #define HASH_SET_MIN_SIZE 8
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| 43 |
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| 44 | typedef unsigned long (*hash_set_hash)(const link_t *);
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| 45 | typedef int (*hash_set_equals)(const link_t *, const link_t *);
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| 46 |
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| 47 | /** Hash table structure. */
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| 48 | typedef struct {
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| 49 | list_t *table;
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| 50 |
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| 51 | /** Current table size */
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| 52 | size_t size;
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| 53 |
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| 54 | /**
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| 55 | * Current number of entries. If count > size,
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| 56 | * the table is rehashed into table with double
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| 57 | * size. If (4 * count < size) && (size > min_size),
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| 58 | * the table is rehashed into table with half the size.
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| 59 | */
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| 60 | size_t count;
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| 61 |
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| 62 | /** Hash function */
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| 63 | hash_set_hash hash;
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| 64 |
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| 65 | /** Hash table item equals function */
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| 66 | hash_set_equals equals;
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| 67 | } hash_set_t;
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| 68 |
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| 69 | extern int hash_set_init(hash_set_t *, hash_set_hash, hash_set_equals, size_t);
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| 70 | extern int hash_set_insert(hash_set_t *, link_t *);
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| 71 | extern link_t *hash_set_find(hash_set_t *, const link_t *);
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| 72 | extern int hash_set_contains(const hash_set_t *, const link_t *);
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| 73 | extern size_t hash_set_count(const hash_set_t *);
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| 74 | extern link_t *hash_set_remove(hash_set_t *, const link_t *);
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| 75 | extern void hash_set_remove_selected(hash_set_t *,
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| 76 | int (*)(link_t *, void *), void *);
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| 77 | extern void hash_set_destroy(hash_set_t *);
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| 78 | extern void hash_set_apply(hash_set_t *, void (*)(link_t *, void *), void *);
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| 79 | extern void hash_set_clear(hash_set_t *, void (*)(link_t *, void *), void *);
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| 80 |
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| 81 | #endif
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| 82 |
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| 83 | /** @}
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| 84 | */
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