NetBSD/lib/libintl/strhash.c

61 lines
2.0 KiB
C

/* $NetBSD: strhash.c,v 1.2 2005/04/27 09:50:26 yamt Exp $ */
/*-
* Copyright (c)2003, 2004 Citrus Project,
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: strhash.c,v 1.2 2005/04/27 09:50:26 yamt Exp $");
#endif /* LIBC_SCCS and not lint */
#include <sys/param.h>
#include <sys/types.h>
#include "libintl_local.h"
/*
* string hash function by P.J.Weinberger.
* this implementation is derived from src/lib/libc/citrus/citrus_db_hash.c.
*/
u_int32_t
/*ARGSUSED*/
__intl_string_hash(const char *str)
{
const u_int8_t *p;
u_int32_t hash = 0, tmp;
for (p = (const u_int8_t *)str; *p; p++) {
hash <<= 4;
hash += *p;
tmp = hash & 0xF0000000;
if (tmp != 0) {
hash ^= tmp;
hash ^= tmp >> 24;
}
}
return hash;
}