155 lines
5.8 KiB
C
155 lines
5.8 KiB
C
/* $NetBSD: hash.h,v 1.10 2009/01/24 10:59:09 dsl 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.h --
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*
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* This file contains definitions used by the hash module,
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* which maintains hash tables.
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*/
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#ifndef _HASH
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#define _HASH
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/*
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* The following defines one entry in the hash table.
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*/
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typedef struct Hash_Entry {
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struct Hash_Entry *next; /* Used to link together all the
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* entries associated with the same
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* bucket. */
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union {
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void *clientPtr; /* Arbitrary pointer */
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time_t clientTime; /* Arbitrary Time */
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} clientInfo;
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unsigned namehash; /* hash value of key */
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char name[1]; /* key string */
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} Hash_Entry;
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typedef struct Hash_Table {
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struct Hash_Entry **bucketPtr;/* Pointers to Hash_Entry, one
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* for each bucket in the table. */
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int size; /* Actual size of array. */
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int numEntries; /* Number of entries in the table. */
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int mask; /* Used to select bits for hashing. */
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} Hash_Table;
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/*
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* The following structure is used by the searching routines
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* to record where we are in the search.
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*/
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typedef struct Hash_Search {
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Hash_Table *tablePtr; /* Table being searched. */
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int nextIndex; /* Next bucket to check (after current). */
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Hash_Entry *hashEntryPtr; /* Next entry to check in current bucket. */
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} Hash_Search;
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/*
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* Macros.
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*/
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/*
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* void * Hash_GetValue(h)
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* Hash_Entry *h;
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*/
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#define Hash_GetValue(h) ((h)->clientInfo.clientPtr)
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#define Hash_GetTimeValue(h) ((h)->clientInfo.clientTime)
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/*
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* Hash_SetValue(h, val);
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* Hash_Entry *h;
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* char *val;
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*/
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#define Hash_SetValue(h, val) ((h)->clientInfo.clientPtr = (val))
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#define Hash_SetTimeValue(h, val) ((h)->clientInfo.clientTime = (val))
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/*
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* Hash_Size(n) returns the number of words in an object of n bytes
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*/
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#define Hash_Size(n) (((n) + sizeof (int) - 1) / sizeof (int))
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void Hash_InitTable(Hash_Table *, int);
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void Hash_DeleteTable(Hash_Table *);
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Hash_Entry *Hash_FindEntry(Hash_Table *, const char *);
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Hash_Entry *Hash_CreateEntry(Hash_Table *, const char *, Boolean *);
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void Hash_DeleteEntry(Hash_Table *, Hash_Entry *);
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Hash_Entry *Hash_EnumFirst(Hash_Table *, Hash_Search *);
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Hash_Entry *Hash_EnumNext(Hash_Search *);
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#endif /* _HASH */
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