lib/libc/uuid/uuid_is_nil.c

   1 /*      $NetBSD: uuid_is_nil.c,v 1.3 2006/10/15 16:14:46 christos 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 1.3 2006/10/15 16:14:46 christos 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 }