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4 * Copyright (c) 1988, 1989 by Adam de Boor
5 * Copyright (c) 1989 by Berkeley Softworks
8 * This code is derived from software contributed to Berkeley by
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39 * @(#)hash.h 8.1 (Berkeley) 6/6/93
43 #ifndef hash_h_f6312f46
44 #define hash_h_f6312f46
48 * This file contains definitions used by the hash module,
49 * which maintains hash tables.
55 * The following defines one entry in the hash table.
57 typedef struct Hash_Entry {
58 struct Hash_Entry *next; /* Link entries within same bucket. */
59 void *clientData; /* Data associated with key. */
60 unsigned namehash; /* hash value of key */
61 char name[1]; /* key string */
64 typedef struct Hash_Table {
65 struct Hash_Entry **bucketPtr; /* Buckets in the table */
66 int size; /* Actual size of array. */
67 int numEntries; /* Number of entries in the table. */
68 int mask; /* Used to select bits for hashing. */
72 * The following structure is used by the searching routines
73 * to record where we are in the search.
75 typedef struct Hash_Search {
76 const Hash_Table *tablePtr; /* Table being searched. */
77 int nextIndex; /* Next bucket to check */
78 Hash_Entry *hashEntryPtr; /* Next entry in current bucket */
86 * void *Hash_GetValue(const Hash_Entry *h)
88 #define Hash_GetValue(h) ((h)->clientData)
91 * Hash_SetValue(Hash_Entry *h, void *val);
93 #define Hash_SetValue(h, val) ((h)->clientData = (val))
95 void Hash_InitTable(Hash_Table *, int);
96 void Hash_DeleteTable(Hash_Table *);
97 Hash_Entry *Hash_FindEntry(const Hash_Table *, const char *);
98 Hash_Entry *Hash_CreateEntry(Hash_Table *, const char *, Boolean *);
99 void Hash_DeleteEntry(Hash_Table *, Hash_Entry *);
100 Hash_Entry *Hash_EnumFirst(const Hash_Table *, Hash_Search *);
101 Hash_Entry *Hash_EnumNext(Hash_Search *);
103 #endif /* hash_h_f6312f46 */