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/* $OpenBSD: hash.h,v 1.4 1998/12/05 00:06:27 espie Exp $ */
/* $NetBSD: hash.h,v 1.5 1996/11/06 17:59:07 christos Exp $ */
/*
* Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
* Copyright (c) 1988, 1989 by Adam de Boor
* Copyright (c) 1989 by Berkeley Softworks
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Adam de Boor.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)hash.h 8.1 (Berkeley) 6/6/93
*/
/* hash.h --
*
* This file contains definitions used by the hash module,
* which maintains hash tables.
*/
#ifndef _HASH
#define _HASH
/*
* The following defines one entry in the hash table.
*/
typedef struct Hash_Entry {
struct Hash_Entry *next; /* Used to link together all the
* entries associated with the same
* bucket. */
ClientData clientData; /* Arbitrary piece of data associated
* with key. */
unsigned namehash; /* hash value of key */
char name[1]; /* key string */
} Hash_Entry;
typedef struct Hash_Table {
struct Hash_Entry **bucketPtr;/* Pointers to Hash_Entry, one
* for each bucket in the table. */
int size; /* Actual size of array. */
int numEntries; /* Number of entries in the table. */
int mask; /* Used to select bits for hashing. */
} Hash_Table;
/*
* The following structure is used by the searching routines
* to record where we are in the search.
*/
typedef struct Hash_Search {
Hash_Table *tablePtr; /* Table being searched. */
int nextIndex; /* Next bucket to check (after current). */
Hash_Entry *hashEntryPtr; /* Next entry to check in current bucket. */
} Hash_Search;
/*
* Macros.
*/
/*
* ClientData Hash_GetValue(h)
* Hash_Entry *h;
*/
#define Hash_GetValue(h) ((h)->clientData)
/*
* Hash_SetValue(h, val);
* Hash_Entry *h;
* char *val;
*/
#define Hash_SetValue(h, val) ((h)->clientData = (ClientData) (val))
/*
* Hash_Size(n) returns the number of words in an object of n bytes
*/
#define Hash_Size(n) (((n) + sizeof (int) - 1) / sizeof (int))
void Hash_InitTable __P((Hash_Table *, int));
void Hash_DeleteTable __P((Hash_Table *));
Hash_Entry *Hash_FindEntry __P((Hash_Table *, char *));
Hash_Entry *Hash_CreateEntry __P((Hash_Table *, char *, Boolean *));
void Hash_DeleteEntry __P((Hash_Table *, Hash_Entry *));
Hash_Entry *Hash_EnumFirst __P((Hash_Table *, Hash_Search *));
Hash_Entry *Hash_EnumNext __P((Hash_Search *));
#endif /* _HASH */
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