167 lines
4.0 KiB
C
167 lines
4.0 KiB
C
/* $NetBSD: hash.c,v 1.7 2002/01/21 19:49:52 tv Exp $ */
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/*
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* Copyright (c) 1994, 1995 Jochen Pohl
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* All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Jochen Pohl for
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* The NetBSD Project.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(__RCSID) && !defined(lint)
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__RCSID("$NetBSD: hash.c,v 1.7 2002/01/21 19:49:52 tv Exp $");
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#endif
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__FBSDID("$FreeBSD$");
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/*
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* XXX Really need a generalized hash table package
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*/
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#include <err.h>
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#include <limits.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include "lint2.h"
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/* pointer to hash table, initialized in inithash() */
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static hte_t **htab;
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static int hash(const char *);
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/*
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* Initialize hash table.
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*/
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void
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_inithash(hte_t ***tablep)
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{
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if (tablep == NULL)
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tablep = &htab;
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*tablep = xcalloc(HSHSIZ2, sizeof (hte_t *));
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}
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/*
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* Compute hash value from a string.
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*/
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static int
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hash(const char *s)
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{
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u_int v;
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const u_char *us;
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v = 0;
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for (us = (const u_char *)s; *us != '\0'; us++) {
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v = (v << sizeof (v)) + *us;
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v ^= v >> (sizeof (v) * CHAR_BIT - sizeof (v));
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}
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return (v % HSHSIZ2);
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}
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/*
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* Look for a hash table entry. If no hash table entry for the
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* given name exists and mknew is set, create a new one.
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*/
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hte_t *
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_hsearch(hte_t **table, const char *s, int mknew)
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{
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int h;
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hte_t *hte;
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if (table == NULL)
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table = htab;
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h = hash(s);
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for (hte = table[h]; hte != NULL; hte = hte->h_link) {
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if (strcmp(hte->h_name, s) == 0)
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break;
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}
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if (hte != NULL || !mknew)
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return (hte);
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/* create a new hte */
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hte = xmalloc(sizeof (hte_t));
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hte->h_name = xstrdup(s);
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hte->h_used = 0;
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hte->h_def = 0;
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hte->h_static = 0;
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hte->h_syms = NULL;
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hte->h_lsym = &hte->h_syms;
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hte->h_calls = NULL;
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hte->h_lcall = &hte->h_calls;
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hte->h_usyms = NULL;
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hte->h_lusym = &hte->h_usyms;
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hte->h_link = table[h];
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hte->h_hte = NULL;
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table[h] = hte;
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return (hte);
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}
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/*
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* Call function f for each name in the hash table.
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*/
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void
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_forall(hte_t **table, void (*f)(hte_t *))
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{
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int i;
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hte_t *hte;
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if (table == NULL)
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table = htab;
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for (i = 0; i < HSHSIZ2; i++) {
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for (hte = table[i]; hte != NULL; hte = hte->h_link)
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(*f)(hte);
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}
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}
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/*
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* Free all contents of the hash table that this module allocated.
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*/
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void
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_destroyhash(hte_t **table)
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{
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int i;
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hte_t *hte, *nexthte;
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if (table == NULL)
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err(1, "_destroyhash called on main hash table");
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for (i = 0; i < HSHSIZ2; i++) {
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for (hte = table[i]; hte != NULL; hte = nexthte) {
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free((void *)hte->h_name);
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nexthte = hte->h_link;
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free(hte);
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}
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}
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free(table);
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}
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