1 /* $NetBSD: hash.h,v 1.2 2017/01/28 21:31:45 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1997 Kungliga Tekniska Högskolan 5 * (Royal Institute of Technology, Stockholm, Sweden). 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * 3. Neither the name of the Institute nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 /* 37 * hash.h. Header file for hash table functions 38 */ 39 40 /* Id */ 41 42 struct hashentry { /* Entry in bucket */ 43 struct hashentry **prev; 44 struct hashentry *next; 45 void *ptr; 46 }; 47 48 typedef struct hashentry Hashentry; 49 50 struct hashtab { /* Hash table */ 51 int (*cmp)(void *, void *); /* Compare function */ 52 unsigned (*hash)(void *); /* hash function */ 53 int sz; /* Size */ 54 Hashentry *tab[1]; /* The table */ 55 }; 56 57 typedef struct hashtab Hashtab; 58 59 /* prototypes */ 60 61 Hashtab *hashtabnew(int sz, 62 int (*cmp)(void *, void *), 63 unsigned (*hash)(void *)); /* Make new hash table */ 64 65 void *hashtabsearch(Hashtab *htab, /* The hash table */ 66 void *ptr); /* The key */ 67 68 69 void *hashtabadd(Hashtab *htab, /* The hash table */ 70 void *ptr); /* The element */ 71 72 int _hashtabdel(Hashtab *htab, /* The table */ 73 void *ptr, /* Key */ 74 int freep); /* Free data part? */ 75 76 void hashtabforeach(Hashtab *htab, 77 int (*func)(void *ptr, void *arg), 78 void *arg); 79 80 unsigned hashadd(const char *s); /* Standard hash function */ 81 unsigned hashcaseadd(const char *s); /* Standard hash function */ 82 unsigned hashjpw(const char *s); /* another hash function */ 83 84 /* macros */ 85 86 /* Don't free space */ 87 #define hashtabdel(htab,key) _hashtabdel(htab,key,FALSE) 88 89 #define hashtabfree(htab,key) _hashtabdel(htab,key,TRUE) /* Do! */ 90