72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
/* $NetBSD: citrus_db_hash.c,v 1.4 2004/01/02 21:49:35 itojun Exp $ */
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/*-
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* Copyright (c)2003 Citrus Project,
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if HAVE_NBTOOL_CONFIG_H
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#include "nbtool_config.h"
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#endif
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: citrus_db_hash.c,v 1.4 2004/01/02 21:49:35 itojun Exp $");
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#endif /* LIBC_SCCS and not lint */
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#ifndef HOSTPROG
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#include "namespace.h"
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#endif
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#include <assert.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include "citrus_namespace.h"
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#include "citrus_types.h"
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#include "citrus_bcs.h"
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#include "citrus_region.h"
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#include "citrus_db_hash.h"
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u_int32_t
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/*ARGSUSED*/
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_citrus_db_hash_std(void *closure, struct _region *r)
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{
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const u_int8_t *p = _region_head(r);
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u_int32_t hash = 0, tmp;
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size_t i;
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for (i = _region_size(r); i > 0; i--) {
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hash <<= 4;
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hash += _bcs_tolower(*p);
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tmp = hash & 0xF0000000;
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if (tmp != 0) {
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hash ^= tmp;
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hash ^= tmp >> 24;
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}
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p++;
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}
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return hash;
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}
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