| 1 | /*
|
|---|
| 2 | * Copyright (c) 1988, 1989, 1990, 1993
|
|---|
| 3 | * The Regents of the University of California. All rights reserved.
|
|---|
| 4 | * Copyright (c) 1988, 1989 by Adam de Boor
|
|---|
| 5 | * Copyright (c) 1989 by Berkeley Softworks
|
|---|
| 6 | * All rights reserved.
|
|---|
| 7 | *
|
|---|
| 8 | * This code is derived from software contributed to Berkeley by
|
|---|
| 9 | * Adam de Boor.
|
|---|
| 10 | *
|
|---|
| 11 | * Redistribution and use in source and binary forms, with or without
|
|---|
| 12 | * modification, are permitted provided that the following conditions
|
|---|
| 13 | * are met:
|
|---|
| 14 | * 1. Redistributions of source code must retain the above copyright
|
|---|
| 15 | * notice, this list of conditions and the following disclaimer.
|
|---|
| 16 | * 2. Redistributions in binary form must reproduce the above copyright
|
|---|
| 17 | * notice, this list of conditions and the following disclaimer in the
|
|---|
| 18 | * documentation and/or other materials provided with the distribution.
|
|---|
| 19 | * 3. All advertising materials mentioning features or use of this software
|
|---|
| 20 | * must display the following acknowledgement:
|
|---|
| 21 | * This product includes software developed by the University of
|
|---|
| 22 | * California, Berkeley and its contributors.
|
|---|
| 23 | * 4. Neither the name of the University nor the names of its contributors
|
|---|
| 24 | * may be used to endorse or promote products derived from this software
|
|---|
| 25 | * without specific prior written permission.
|
|---|
| 26 | *
|
|---|
| 27 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|---|
| 28 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|---|
| 29 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|---|
| 30 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|---|
| 31 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|---|
| 32 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|---|
| 33 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|---|
| 34 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|---|
| 35 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|---|
| 36 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|---|
| 37 | * SUCH DAMAGE.
|
|---|
| 38 | *
|
|---|
| 39 | * @(#)hash.h 8.1 (Berkeley) 6/6/93
|
|---|
| 40 | * $FreeBSD: src/usr.bin/make/hash.h,v 1.12 2002/09/17 21:29:06 jmallett Exp $
|
|---|
| 41 | */
|
|---|
| 42 |
|
|---|
| 43 | /* hash.h --
|
|---|
| 44 | *
|
|---|
| 45 | * This file contains definitions used by the hash module,
|
|---|
| 46 | * which maintains hash tables.
|
|---|
| 47 | */
|
|---|
| 48 |
|
|---|
| 49 | #ifndef _HASH
|
|---|
| 50 | #define _HASH
|
|---|
| 51 |
|
|---|
| 52 | /*
|
|---|
| 53 | * The following defines one entry in the hash table.
|
|---|
| 54 | */
|
|---|
| 55 |
|
|---|
| 56 | typedef struct Hash_Entry {
|
|---|
| 57 | struct Hash_Entry *next; /* Used to link together all the
|
|---|
| 58 | * entries associated with the same
|
|---|
| 59 | * bucket. */
|
|---|
| 60 | void * clientData; /* Arbitrary piece of data associated
|
|---|
| 61 | * with key. */
|
|---|
| 62 | unsigned namehash; /* hash value of key */
|
|---|
| 63 | char name[1]; /* key string */
|
|---|
| 64 | } Hash_Entry;
|
|---|
| 65 |
|
|---|
| 66 | typedef struct Hash_Table {
|
|---|
| 67 | struct Hash_Entry **bucketPtr;/* Pointers to Hash_Entry, one
|
|---|
| 68 | * for each bucket in the table. */
|
|---|
| 69 | int size; /* Actual size of array. */
|
|---|
| 70 | int numEntries; /* Number of entries in the table. */
|
|---|
| 71 | int mask; /* Used to select bits for hashing. */
|
|---|
| 72 | } Hash_Table;
|
|---|
| 73 |
|
|---|
| 74 | /*
|
|---|
| 75 | * The following structure is used by the searching routines
|
|---|
| 76 | * to record where we are in the search.
|
|---|
| 77 | */
|
|---|
| 78 |
|
|---|
| 79 | typedef struct Hash_Search {
|
|---|
| 80 | Hash_Table *tablePtr; /* Table being searched. */
|
|---|
| 81 | int nextIndex; /* Next bucket to check (after current). */
|
|---|
| 82 | Hash_Entry *hashEntryPtr; /* Next entry to check in current bucket. */
|
|---|
| 83 | } Hash_Search;
|
|---|
| 84 |
|
|---|
| 85 | /*
|
|---|
| 86 | * Macros.
|
|---|
| 87 | */
|
|---|
| 88 |
|
|---|
| 89 | /*
|
|---|
| 90 | * void * Hash_GetValue(h)
|
|---|
| 91 | * Hash_Entry *h;
|
|---|
| 92 | */
|
|---|
| 93 |
|
|---|
| 94 | #define Hash_GetValue(h) ((h)->clientData)
|
|---|
| 95 |
|
|---|
| 96 | /*
|
|---|
| 97 | * Hash_SetValue(h, val);
|
|---|
| 98 | * Hash_Entry *h;
|
|---|
| 99 | * char *val;
|
|---|
| 100 | */
|
|---|
| 101 |
|
|---|
| 102 | #define Hash_SetValue(h, val) ((h)->clientData = (void *) (val))
|
|---|
| 103 |
|
|---|
| 104 | /*
|
|---|
| 105 | * Hash_Size(n) returns the number of words in an object of n bytes
|
|---|
| 106 | */
|
|---|
| 107 |
|
|---|
| 108 | #define Hash_Size(n) (((n) + sizeof (int) - 1) / sizeof (int))
|
|---|
| 109 |
|
|---|
| 110 | void Hash_InitTable(Hash_Table *, int);
|
|---|
| 111 | void Hash_DeleteTable(Hash_Table *);
|
|---|
| 112 | Hash_Entry *Hash_FindEntry(Hash_Table *, char *);
|
|---|
| 113 | Hash_Entry *Hash_CreateEntry(Hash_Table *, char *, Boolean *);
|
|---|
| 114 | void Hash_DeleteEntry(Hash_Table *, Hash_Entry *);
|
|---|
| 115 | Hash_Entry *Hash_EnumFirst(Hash_Table *, Hash_Search *);
|
|---|
| 116 | Hash_Entry *Hash_EnumNext(Hash_Search *);
|
|---|
| 117 |
|
|---|
| 118 | #endif /* _HASH */
|
|---|
