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      1 /*	$NetBSD: uuid_is_nil.c,v 1.4 2008/04/23 07:52:32 plunky Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2002 Marcel Moolenaar
      5  * Copyright (c) 2002 Hiten Mahesh Pandya
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     27  * SUCH DAMAGE.
     28  *
     29  * $FreeBSD: src/lib/libc/uuid/uuid_is_nil.c,v 1.2 2003/08/08 19:18:43 marcel Exp $
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #if defined(LIBC_SCCS) && !defined(lint)
     34 __RCSID("$NetBSD: uuid_is_nil.c,v 1.4 2008/04/23 07:52:32 plunky Exp $");
     35 #endif
     36 
     37 #include "namespace.h"
     38 
     39 #include <string.h>
     40 #include <uuid.h>
     41 
     42 #ifdef __weak_alias
     43 __weak_alias(uuid_is_nil,_uuid_is_nil)
     44 #endif
     45 
     46 /*
     47  * uuid_is_nil() - return whether the UUID is a nil UUID.
     48  * See also:
     49  *	http://www.opengroup.org/onlinepubs/009629399/uuid_is_nil.htm
     50  */
     51 int32_t
     52 uuid_is_nil(const uuid_t *u, uint32_t *status)
     53 {
     54 	static const uuid_t nil = { .time_low = 0 };
     55 
     56 	if (status)
     57 		*status = uuid_s_ok;
     58 
     59 	if (!u)
     60 		return (1);
     61 
     62 	return (memcmp(u, &nil, sizeof(uuid_t)) == 0 ? 1 : 0);
     63 }
     64