lib/libc/uuid/uuid_equal.c

   1 /*-
   2  * Copyright (c) 2002,2005 Marcel Moolenaar
   3  * Copyright (c) 2002 Hiten Mahesh Pandya
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  *
  27  * $FreeBSD: src/lib/libc/uuid/uuid_equal.c,v 1.3 2005/01/03 02:56:15 marcel Exp $
  28  * $DragonFly: src/lib/libc/uuid/uuid_equal.c,v 1.1 2007/06/16 19:57:14 dillon Exp $
  29  */
  30
  31 #include <string.h>
  32 #include <uuid.h>
  33
  34 /*
  35  * uuid_equal() - compare for equality.
  36  * See also:
  37  *      http://www.opengroup.org/onlinepubs/009629399/uuid_equal.htm
  38  */
  39 int32_t
  40 uuid_equal(const uuid_t *a, const uuid_t *b, uint32_t *status)
  41 {
  42
  43         if (status != NULL)
  44                 *status = uuid_s_ok;
  45
  46         /* Deal with equal or NULL pointers. */
  47         if (a == b)
  48                 return (1);
  49         if (a == NULL)
  50                 return (uuid_is_nil(b, NULL));
  51         if (b == NULL)
  52                 return (uuid_is_nil(a, NULL));
  53
  54         /* Do a byte for byte comparison. */
  55         return ((memcmp(a, b, sizeof(uuid_t))) ? 0 : 1);
  56 }