9da7bdde06
The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point. Initially, only tag files that use BSD 4-Clause "Original" license. RelNotes: yes Differential Revision: https://reviews.freebsd.org/D13133
134 lines
4.1 KiB
C
134 lines
4.1 KiB
C
/* $FreeBSD$ */
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/* $NetBSD: hash.h,v 1.1.1.1 1999/11/19 04:30:56 mrg Exp $ */
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/*-
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* SPDX-License-Identifier: BSD-4-Clause
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*
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* Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
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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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ClientData clientData; /* Arbitrary piece of data associated
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* with key. */
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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;
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/* 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
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* current). */
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Hash_Entry *hashEntryPtr; /* Next entry to check in current
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* 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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* ClientData Hash_GetValue(h)
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* Hash_Entry *h;
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*/
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#define Hash_GetValue(h) ((h)->clientData)
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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)->clientData = (ClientData) (val))
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#ifdef ORDER
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/*
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* Hash_GetKey(h);
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* Hash_Entry *h;
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*/
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#define Hash_GetKey(h) ((h)->name)
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#endif /* ORDER */
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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 *, char *);
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Hash_Entry *Hash_CreateEntry(Hash_Table *, 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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