132 lines
5.5 KiB
C
132 lines
5.5 KiB
C
/* $NetBSD: hash.h,v 1.31 2020/10/25 19:19:07 rillig Exp $ */
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/*
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* Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
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*
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* This code is derived from software contributed to Berkeley by
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* Adam de Boor.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)hash.h 8.1 (Berkeley) 6/6/93
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*/
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/*
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* Copyright (c) 1988, 1989 by Adam de Boor
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* Copyright (c) 1989 by Berkeley Softworks
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Adam de Boor.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)hash.h 8.1 (Berkeley) 6/6/93
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*/
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/* Hash tables with strings as keys and arbitrary pointers as values. */
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#ifndef MAKE_HASH_H
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#define MAKE_HASH_H
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/* A single key-value entry in the hash table. */
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typedef struct HashEntry {
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struct HashEntry *next; /* Used to link together all the entries
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* associated with the same bucket. */
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void *value;
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unsigned int key_hash; /* hash value of the key */
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char key[1]; /* key string, variable length */
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} HashEntry;
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/* The hash table containing the entries. */
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typedef struct HashTable {
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HashEntry **buckets; /* Pointers to HashEntry, one
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* for each bucket in the table. */
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unsigned int bucketsSize;
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unsigned int numEntries; /* Number of entries in the table. */
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unsigned int bucketsMask; /* Used to select the bucket for a hash. */
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unsigned int maxchain; /* max length of chain detected */
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} HashTable;
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/* State of an iteration over all entries in a table. */
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typedef struct HashIter {
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HashTable *table; /* Table being searched. */
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unsigned int nextBucket; /* Next bucket to check (after current). */
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HashEntry *entry; /* Next entry to check in current bucket. */
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} HashIter;
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static inline MAKE_ATTR_UNUSED void *
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HashEntry_Get(HashEntry *h)
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{
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return h->value;
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}
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static inline MAKE_ATTR_UNUSED void
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HashEntry_Set(HashEntry *h, void *datum)
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{
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h->value = datum;
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}
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void HashTable_Init(HashTable *);
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void HashTable_Done(HashTable *);
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HashEntry *HashTable_FindEntry(HashTable *, const char *);
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void *HashTable_FindValue(HashTable *, const char *);
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unsigned int Hash_Hash(const char *);
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void *HashTable_FindValueHash(HashTable *, const char *, unsigned int);
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HashEntry *HashTable_CreateEntry(HashTable *, const char *, Boolean *);
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void HashTable_DeleteEntry(HashTable *, HashEntry *);
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void HashTable_DebugStats(HashTable *, const char *);
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void HashIter_Init(HashIter *, HashTable *);
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HashEntry *HashIter_Next(HashIter *);
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#endif /* MAKE_HASH_H */
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