compare.c revision 18a1444b4f1e6a0948fd38fa0de382d86cfe04de 
1/*
2 * compare.c --- compare whether or not two UUID's are the same
3 *
4 * Returns 0 if the two UUID's are different, and 1 if they are the same.
5 *
6 * Copyright (C) 1996, 1997 Theodore Ts'o.
7 *
8 * %Begin-Header%
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, and the entire permission notice in its entirety,
14 *    including the disclaimer of warranties.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote
19 *    products derived from this software without specific prior
20 *    written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
25 * WHICH ARE HEREBY DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE
26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
28 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
29 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
30 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
32 * USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH
33 * DAMAGE.
34 * %End-Header%
35 */
36
37#include "uuidP.h"
38#include <string.h>
39
40#define UUCMP(u1,u2) if (u1 != u2) return((u1 < u2) ? -1 : 1);
41
42int uuid_compare(const uuid_t uu1, const uuid_t uu2)
43{
44	struct uuid	uuid1, uuid2;
45
46	uuid_unpack(uu1, &uuid1);
47	uuid_unpack(uu2, &uuid2);
48
49	UUCMP(uuid1.time_low, uuid2.time_low);
50	UUCMP(uuid1.time_mid, uuid2.time_mid);
51	UUCMP(uuid1.time_hi_and_version, uuid2.time_hi_and_version);
52	UUCMP(uuid1.clock_seq, uuid2.clock_seq);
53	return memcmp(uuid1.node, uuid2.node, 6);
54}
55
56