1/*	$NetBSD: strhash.c,v 1.2 2005/04/27 09:50:26 yamt Exp $	*/
2
3/*-
4 * Copyright (c)2003, 2004 Citrus Project,
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30#if defined(LIBC_SCCS) && !defined(lint)
31__RCSID("$NetBSD: strhash.c,v 1.2 2005/04/27 09:50:26 yamt Exp $");
32#endif /* LIBC_SCCS and not lint */
33
34#include <sys/param.h>
35#include <sys/types.h>
36
37#include "libintl_local.h"
38
39/*
40 * string hash function by P.J.Weinberger.
41 * this implementation is derived from src/lib/libc/citrus/citrus_db_hash.c.
42 */
43uint32_t
44/*ARGSUSED*/
45__intl_string_hash(const char *str)
46{
47	const uint8_t *p;
48	uint32_t hash = 0, tmp;
49
50	for (p = (const uint8_t *)str; *p; p++) {
51		hash <<= 4;
52		hash += *p;
53		tmp = hash & 0xF0000000;
54		if (tmp != 0) {
55			hash ^= tmp;
56			hash ^= tmp >> 24;
57		}
58	}
59	return hash;
60}
61