/* $FreeBSD$ */ /* $NetBSD: hash.h,v 1.1.1.1 1999/11/19 04:30:56 mrg Exp $ */ /*- * SPDX-License-Identifier: BSD-4-Clause * * 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)) #ifdef ORDER /* * Hash_GetKey(h); * Hash_Entry *h; */ #define Hash_GetKey(h) ((h)->name) #endif /* ORDER */ /* * 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(Hash_Table *, int); void Hash_DeleteTable(Hash_Table *); Hash_Entry *Hash_FindEntry(Hash_Table *, char *); Hash_Entry *Hash_CreateEntry(Hash_Table *, char *, Boolean *); void Hash_DeleteEntry(Hash_Table *, Hash_Entry *); Hash_Entry *Hash_EnumFirst(Hash_Table *, Hash_Search *); Hash_Entry *Hash_EnumNext(Hash_Search *); #endif /* _HASH */