hash.h revision 1.26
1 /* $NetBSD: hash.h,v 1.26 2020/10/05 20:21:30 rillig Exp $ */ 2 3 /* 4 * Copyright (c) 1988, 1989, 1990 The Regents of the University of California. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Adam de Boor. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * from: @(#)hash.h 8.1 (Berkeley) 6/6/93 34 */ 35 36 /* 37 * Copyright (c) 1988, 1989 by Adam de Boor 38 * Copyright (c) 1989 by Berkeley Softworks 39 * All rights reserved. 40 * 41 * This code is derived from software contributed to Berkeley by 42 * Adam de Boor. 43 * 44 * Redistribution and use in source and binary forms, with or without 45 * modification, are permitted provided that the following conditions 46 * are met: 47 * 1. Redistributions of source code must retain the above copyright 48 * notice, this list of conditions and the following disclaimer. 49 * 2. Redistributions in binary form must reproduce the above copyright 50 * notice, this list of conditions and the following disclaimer in the 51 * documentation and/or other materials provided with the distribution. 52 * 3. All advertising materials mentioning features or use of this software 53 * must display the following acknowledgement: 54 * This product includes software developed by the University of 55 * California, Berkeley and its contributors. 56 * 4. Neither the name of the University nor the names of its contributors 57 * may be used to endorse or promote products derived from this software 58 * without specific prior written permission. 59 * 60 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 61 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 62 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 63 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 64 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 65 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 66 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 67 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 68 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 69 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 70 * SUCH DAMAGE. 71 * 72 * from: @(#)hash.h 8.1 (Berkeley) 6/6/93 73 */ 74 75 /* Hash tables with strings as keys and arbitrary pointers as values. */ 76 77 #ifndef MAKE_HASH_H 78 #define MAKE_HASH_H 79 80 /* A single key-value entry in the hash table. */ 81 typedef struct Hash_Entry { 82 struct Hash_Entry *next; /* Used to link together all the entries 83 * associated with the same bucket. */ 84 void *value; 85 unsigned namehash; /* hash value of key */ 86 char name[1]; /* key string, variable length */ 87 } Hash_Entry; 88 89 /* The hash table containing the entries. */ 90 typedef struct Hash_Table { 91 Hash_Entry **buckets; /* Pointers to Hash_Entry, one 92 * for each bucket in the table. */ 93 unsigned int bucketsSize; 94 unsigned int numEntries; /* Number of entries in the table. */ 95 unsigned int bucketsMask; /* Used to select the bucket for a hash. */ 96 unsigned int maxchain; /* max length of chain detected */ 97 } Hash_Table; 98 99 /* 100 * The following structure is used by the searching routines 101 * to record where we are in the search. 102 */ 103 typedef struct Hash_Search { 104 Hash_Table *table; /* Table being searched. */ 105 unsigned int nextBucket; /* Next bucket to check (after current). */ 106 Hash_Entry *entry; /* Next entry to check in current bucket. */ 107 } Hash_Search; 108 109 static inline MAKE_ATTR_UNUSED void * 110 Hash_GetValue(Hash_Entry *h) 111 { 112 return h->value; 113 } 114 115 static inline MAKE_ATTR_UNUSED void 116 Hash_SetValue(Hash_Entry *h, void *datum) 117 { 118 h->value = datum; 119 } 120 121 void Hash_InitTable(Hash_Table *); 122 void Hash_DeleteTable(Hash_Table *); 123 Hash_Entry *Hash_FindEntry(Hash_Table *, const char *); 124 void *Hash_FindValue(Hash_Table *, const char *); 125 Hash_Entry *Hash_CreateEntry(Hash_Table *, const char *, Boolean *); 126 void Hash_DeleteEntry(Hash_Table *, Hash_Entry *); 127 Hash_Entry *Hash_EnumFirst(Hash_Table *, Hash_Search *); 128 Hash_Entry *Hash_EnumNext(Hash_Search *); 129 void Hash_ForEach(Hash_Table *, void (*)(void *, void *), void *); 130 void Hash_DebugStats(Hash_Table *, const char *); 131 132 #endif /* MAKE_HASH_H */ 133
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