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      1 /*
      2  * isnull.c --- Check whether or not the UUID is null
      3  *
      4  * Copyright (C) 1996, 1997 Theodore Ts'o.
      5  *
      6  * %Begin-Header%
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, and the entire permission notice in its entirety,
     12  *    including the disclaimer of warranties.
     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  * 3. The name of the author may not be used to endorse or promote
     17  *    products derived from this software without specific prior
     18  *    written permission.
     19  *
     20  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
     21  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
     23  * WHICH ARE HEREBY DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE
     24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
     26  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
     27  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
     28  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
     30  * USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH
     31  * DAMAGE.
     32  * %End-Header%
     33  */
     34 
     35 #include "uuidP.h"
     36 
     37 /* Returns 1 if the uuid is the NULL uuid */
     38 int uuid_is_null(const uuid_t uu)
     39 {
     40 	const unsigned char 	*cp;
     41 	int			i;
     42 
     43 	for (i=0, cp = uu; i < 16; i++)
     44 		if (*cp++)
     45 			return 0;
     46 	return 1;
     47 }
     48 
     49