src/libs/uuid/compare.c

   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
  42 int 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