59 lines
2.1 KiB
C
59 lines
2.1 KiB
C
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/* $NetBSD: uuid_hash.c,v 1.2 2008/04/23 07:52:32 plunky Exp $ */
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/*-
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* Copyright (c) 2002 Marcel Moolenaar
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* Copyright (c) 2002 Hiten Mahesh Pandya
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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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* $FreeBSD: src/lib/libc/uuid/uuid_hash.c,v 1.2 2003/08/08 19:18:43 marcel Exp $
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: uuid_hash.c,v 1.2 2008/04/23 07:52:32 plunky Exp $");
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#endif
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#include "namespace.h"
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#include <uuid.h>
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/*
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* uuid_hash() - generate a hash value.
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* See also:
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* http://www.opengroup.org/onlinepubs/009629399/uuid_hash.htm
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*/
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uint16_t
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uuid_hash(const uuid_t *u, uint32_t *status)
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{
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if (status)
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*status = uuid_s_ok;
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/*
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* Use the most frequently changing bits in the UUID as the hash
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* value. This should yield a good enough distribution...
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*/
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return ((u) ? u->time_low & 0xffff : 0);
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}
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