libmisc/uuid/compare.c

0001 /*
0002  * compare.c --- compare whether or not two UUID's are the same
0003  *
0004  * Returns 0 if the two UUID's are different, and 1 if they are the same.
0005  *
0006  * Copyright (C) 1996, 1997 Theodore Ts'o.
0007  *
0008  * %Begin-Header%
0009  * Redistribution and use in source and binary forms, with or without
0010  * modification, are permitted provided that the following conditions
0011  * are met:
0012  * 1. Redistributions of source code must retain the above copyright
0013  *    notice, and the entire permission notice in its entirety,
0014  *    including the disclaimer of warranties.
0015  * 2. Redistributions in binary form must reproduce the above copyright
0016  *    notice, this list of conditions and the following disclaimer in the
0017  *    documentation and/or other materials provided with the distribution.
0018  * 3. The name of the author may not be used to endorse or promote
0019  *    products derived from this software without specific prior
0020  *    written permission.
0021  *
0022  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
0023  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
0024  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
0025  * WHICH ARE HEREBY DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE
0026  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0027  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
0028  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
0029  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
0030  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
0031  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
0032  * USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH
0033  * DAMAGE.
0034  * %End-Header%
0035  */
0036
0037 #ifdef HAVE_CONFIG_H
0038 #include "config.h"
0039 #endif
0040
0041 #include <string.h>
0042 #include "uuidP.h"
0043
0044 #define UUCMP(u1,u2) if (u1 != u2) return((u1 < u2) ? -1 : 1);
0045
0046 int uuid_compare(const uuid_t uu1, const uuid_t uu2)
0047 {
0048     struct uuid uuid1, uuid2;
0049
0050     uuid_unpack(uu1, &uuid1);
0051     uuid_unpack(uu2, &uuid2);
0052
0053     UUCMP(uuid1.time_low, uuid2.time_low);
0054     UUCMP(uuid1.time_mid, uuid2.time_mid);
0055     UUCMP(uuid1.time_hi_and_version, uuid2.time_hi_and_version);
0056     UUCMP(uuid1.clock_seq, uuid2.clock_seq);
0057     return memcmp(uuid1.node, uuid2.node, 6);
0058 }
0059