2 * Copyright (c) 2002,2005 Marcel Moolenaar
3 * Copyright (c) 2002 Hiten Mahesh Pandya
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
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
27 * $FreeBSD: src/lib/libc/uuid/uuid_compare.c,v 1.6 2007/04/05 02:07:33 delphij Exp $
28 * $DragonFly: src/lib/libc/uuid/uuid_compare.c,v 1.1 2007/06/16 19:57:14 dillon Exp $
34 /* A macro used to improve the readability of uuid_compare(). */
35 #define DIFF_RETURN(a, b, field) do { \
36 if ((a)->field != (b)->field) \
37 return (((a)->field < (b)->field) ? -1 : 1); \
41 * uuid_compare() - compare two UUIDs.
43 * http://www.opengroup.org/onlinepubs/009629399/uuid_compare.htm
45 * NOTE: Either UUID can be NULL, meaning a nil UUID. nil UUIDs are smaller
46 * than any non-nil UUID.
49 uuid_compare(const uuid_t
*a
, const uuid_t
*b
, uint32_t *status
)
56 /* Deal with NULL or equal pointers. */
60 return ((uuid_is_nil(b
, NULL
)) ? 0 : -1);
62 return ((uuid_is_nil(a
, NULL
)) ? 0 : 1);
64 /* We have to compare the hard way. */
65 DIFF_RETURN(a
, b
, time_low
);
66 DIFF_RETURN(a
, b
, time_mid
);
67 DIFF_RETURN(a
, b
, time_hi_and_version
);
68 DIFF_RETURN(a
, b
, clock_seq_hi_and_reserved
);
69 DIFF_RETURN(a
, b
, clock_seq_low
);
71 res
= memcmp(a
->node
, b
->node
, sizeof(a
->node
));
73 return ((res
< 0) ? -1 : 1);