1  /*
       2   * compare.c --- compare whether or not two UUIDs are the same
       3   *
       4   * Returns 0 if the two UUIDs 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