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 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