61 lines
2.0 KiB
C
61 lines
2.0 KiB
C
/* $NetBSD: strhash.c,v 1.3 2007/09/25 08:19:09 junyoung 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 1.3 2007/09/25 08:19:09 junyoung 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.
|
|
*/
|
|
uint32_t
|
|
/*ARGSUSED*/
|
|
__intl_string_hash(const char *str)
|
|
{
|
|
const uint8_t *p;
|
|
uint32_t hash = 0, tmp;
|
|
|
|
for (p = (const uint8_t *)str; *p; p++) {
|
|
hash <<= 4;
|
|
hash += *p;
|
|
tmp = hash & 0xF0000000;
|
|
if (tmp != 0) {
|
|
hash ^= tmp;
|
|
hash ^= tmp >> 24;
|
|
}
|
|
}
|
|
return hash;
|
|
}
|