1 /* $NetBSD: uuid_compare.c,v 1.2 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_compare.c,v 1.3 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_compare.c,v 1.2 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 /*
43 * uuid_compare() - compare two UUIDs.
44 * See also:
45 * http://www.opengroup.org/onlinepubs/009629399/uuid_compare.htm
46 *
47 * NOTE: Either UUID can be NULL, meaning a nil UUID. nil UUIDs are smaller
48 * than any non-nil UUID.
49 */
50 int32_t
uuid_compare(const uuid_t * a,const uuid_t * b,uint32_t * status)51 uuid_compare(const uuid_t *a, const uuid_t *b, uint32_t *status)
52 {
53 int res;
54
55 if (status != NULL)
56 *status = uuid_s_ok;
57
58 /* Deal with NULL or equal pointers. */
59 if (a == b)
60 return (0);
61 if (a == NULL)
62 return ((uuid_is_nil(b, NULL)) ? 0 : -1);
63 if (b == NULL)
64 return ((uuid_is_nil(a, NULL)) ? 0 : 1);
65
66 /* We have to compare the hard way. */
67 res = (int)((int64_t)a->time_low - (int64_t)b->time_low);
68 if (res)
69 return ((res < 0) ? -1 : 1);
70 res = (int)a->time_mid - (int)b->time_mid;
71 if (res)
72 return ((res < 0) ? -1 : 1);
73 res = (int)a->time_hi_and_version - (int)b->time_hi_and_version;
74 if (res)
75 return ((res < 0) ? -1 : 1);
76 res = (int)a->clock_seq_hi_and_reserved -
77 (int)b->clock_seq_hi_and_reserved;
78 if (res)
79 return ((res < 0) ? -1 : 1);
80 res = (int)a->clock_seq_low - (int)b->clock_seq_low;
81 if (res)
82 return ((res < 0) ? -1 : 1);
83 res = memcmp(a->node, b->node, sizeof(a->node));
84 if (res)
85 return ((res < 0) ? -1 : 1);
86 return (0);
87 }
88