compare.c

00001 /*
00002  * compare.c --- compare whether or not two UUID's are the same
00003  *
00004  * Returns 0 if the two UUID's are different, and 1 if they are the same.
00005  * 
00006  * Copyright (C) 1996, 1997 Theodore Ts'o.
00007  *
00008  * %Begin-Header%
00009  * Redistribution and use in source and binary forms, with or without
00010  * modification, are permitted provided that the following conditions
00011  * are met:
00012  * 1. Redistributions of source code must retain the above copyright
00013  *    notice, and the entire permission notice in its entirety,
00014  *    including the disclaimer of warranties.
00015  * 2. Redistributions in binary form must reproduce the above copyright
00016  *    notice, this list of conditions and the following disclaimer in the
00017  *    documentation and/or other materials provided with the distribution.
00018  * 3. The name of the author may not be used to endorse or promote
00019  *    products derived from this software without specific prior
00020  *    written permission.
00021  * 
00022  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
00023  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00024  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
00025  * WHICH ARE HEREBY DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE
00026  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
00027  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
00028  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
00029  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00030  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
00031  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
00032  * USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH
00033  * DAMAGE.
00034  * %End-Header%
00035  */
00036 
00037 #include "uuidP.h"
00038 #include <string.h>
00039 
00040 #define UUCMP(u1,u2) if (u1 != u2) return((u1 < u2) ? -1 : 1);
00041 
00042 int uuid_compare(const uuid_t uu1, const uuid_t uu2)
00043 {
00044         struct uuid     uuid1, uuid2;
00045 
00046         uuid_unpack(uu1, &uuid1);
00047         uuid_unpack(uu2, &uuid2);
00048 
00049         UUCMP(uuid1.time_low, uuid2.time_low);
00050         UUCMP(uuid1.time_mid, uuid2.time_mid);
00051         UUCMP(uuid1.time_hi_and_version, uuid2.time_hi_and_version);
00052         UUCMP(uuid1.clock_seq, uuid2.clock_seq);
00053         return memcmp(uuid1.node, uuid2.node, 6);
00054 }
00055 

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