117 lines
4.0 KiB
C
117 lines
4.0 KiB
C
/*
|
|
* Copyright (c) 1988, 1989, 1990, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
* 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.
|
|
*
|
|
* @(#)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))
|
|
|
|
Hash_Entry *Hash_CreateEntry __P((Hash_Table *, char *, Boolean *));
|
|
void Hash_DeleteEntry __P((Hash_Table *, Hash_Entry *));
|
|
void Hash_DeleteTable __P((Hash_Table *));
|
|
Hash_Entry *Hash_EnumFirst __P((Hash_Table *, Hash_Search *));
|
|
Hash_Entry *Hash_EnumNext __P((Hash_Search *));
|
|
Hash_Entry *Hash_FindEntry __P((Hash_Table *, char *));
|
|
void Hash_InitTable __P((Hash_Table *, int));
|
|
|
|
#endif /* _HASH */
|