1/*	$OpenBSD: uuid_is_nil.c,v 1.3 2015/09/13 11:36:16 guenther Exp $	*/
2/*	$NetBSD: uuid_is_nil.c,v 1.4 2008/04/23 07:52:32 plunky Exp $	*/
3
4/*
5 * Copyright (c) 2002 Marcel Moolenaar
6 * Copyright (c) 2002 Hiten Mahesh Pandya
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 * $FreeBSD: src/lib/libc/uuid/uuid_is_nil.c,v 1.2 2003/08/08 19:18:43 marcel Exp $
31 */
32
33#include <string.h>
34#include <uuid.h>
35
36/*
37 * uuid_is_nil() - return whether the UUID is a nil UUID.
38 * See also:
39 *	http://www.opengroup.org/onlinepubs/009629399/uuid_is_nil.htm
40 */
41int32_t
42uuid_is_nil(const uuid_t *u, uint32_t *status)
43{
44	static const uuid_t nil = { .time_low = 0 };
45
46	if (status)
47		*status = uuid_s_ok;
48
49	if (!u)
50		return (1);
51
52	return (memcmp(u, &nil, sizeof(uuid_t)) == 0 ? 1 : 0);
53}
54DEF_WEAK(uuid_is_nil);
55