| 1 | /*
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| 2 | * Copyright (c) 1997 Kungliga Tekniska Högskolan
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| 3 | * (Royal Institute of Technology, Stockholm, Sweden).
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| 4 | * All rights reserved.
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| 5 | *
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| 6 | * Redistribution and use in source and binary forms, with or without
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| 7 | * modification, are permitted provided that the following conditions
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| 8 | * are met:
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| 9 | *
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| 10 | * 1. Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | *
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer in the
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| 15 | * documentation and/or other materials provided with the distribution.
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| 16 | *
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| 17 | * 3. Neither the name of the Institute nor the names of its contributors
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| 18 | * may be used to endorse or promote products derived from this software
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| 19 | * without specific prior written permission.
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| 20 | *
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| 21 | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 31 | * SUCH DAMAGE.
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| 32 | */
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| 33 |
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| 34 | /*
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| 35 | * hash.h. Header file for hash table functions
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| 36 | */
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| 37 |
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| 38 | /* $Id$ */
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| 39 |
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| 40 | struct hashentry { /* Entry in bucket */
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| 41 | struct hashentry **prev;
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| 42 | struct hashentry *next;
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| 43 | void *ptr;
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| 44 | };
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| 45 |
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| 46 | typedef struct hashentry Hashentry;
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| 47 |
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| 48 | struct hashtab { /* Hash table */
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| 49 | int (*cmp)(void *, void *); /* Compare function */
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| 50 | unsigned (*hash)(void *); /* hash function */
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| 51 | int sz; /* Size */
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| 52 | Hashentry *tab[1]; /* The table */
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| 53 | };
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| 54 |
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| 55 | typedef struct hashtab Hashtab;
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| 56 |
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| 57 | /* prototypes */
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| 58 |
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| 59 | Hashtab *hashtabnew(int sz,
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| 60 | int (*cmp)(void *, void *),
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| 61 | unsigned (*hash)(void *)); /* Make new hash table */
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| 62 |
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| 63 | void *hashtabsearch(Hashtab *htab, /* The hash table */
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| 64 | void *ptr); /* The key */
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| 65 |
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| 66 |
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| 67 | void *hashtabadd(Hashtab *htab, /* The hash table */
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| 68 | void *ptr); /* The element */
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| 69 |
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| 70 | int _hashtabdel(Hashtab *htab, /* The table */
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| 71 | void *ptr, /* Key */
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| 72 | int freep); /* Free data part? */
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| 73 |
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| 74 | void hashtabforeach(Hashtab *htab,
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| 75 | int (*func)(void *ptr, void *arg),
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| 76 | void *arg);
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| 77 |
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| 78 | unsigned hashadd(const char *s); /* Standard hash function */
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| 79 | unsigned hashcaseadd(const char *s); /* Standard hash function */
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| 80 | unsigned hashjpw(const char *s); /* another hash function */
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| 81 |
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| 82 | /* macros */
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| 83 |
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| 84 | /* Don't free space */
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| 85 | #define hashtabdel(htab,key) _hashtabdel(htab,key,FALSE)
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| 86 |
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| 87 | #define hashtabfree(htab,key) _hashtabdel(htab,key,TRUE) /* Do! */
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