isnull.c

00001 /*
00002  * isnull.c --- Check whether or not the UUID is null
00003  * 
00004  * Copyright (C) 1996, 1997 Theodore Ts'o.
00005  *
00006  * %Begin-Header%
00007  * Redistribution and use in source and binary forms, with or without
00008  * modification, are permitted provided that the following conditions
00009  * are met:
00010  * 1. Redistributions of source code must retain the above copyright
00011  *    notice, and the entire permission notice in its entirety,
00012  *    including the disclaimer of warranties.
00013  * 2. Redistributions in binary form must reproduce the above copyright
00014  *    notice, this list of conditions and the following disclaimer in the
00015  *    documentation and/or other materials provided with the distribution.
00016  * 3. The name of the author may not be used to endorse or promote
00017  *    products derived from this software without specific prior
00018  *    written permission.
00019  * 
00020  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
00021  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00022  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
00023  * WHICH ARE HEREBY DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE
00024  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
00025  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
00026  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
00027  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00028  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
00029  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
00030  * USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH
00031  * DAMAGE.
00032  * %End-Header%
00033  */
00034 
00035 #include "uuidP.h"
00036 
00037 /* Returns 1 if the uuid is the NULL uuid */
00038 int uuid_is_null(const uuid_t uu)
00039 {
00040         const unsigned char     *cp;
00041         int                     i;
00042 
00043         for (i=0, cp = uu; i < 16; i++)
00044                 if (*cp++)
00045                         return 0;
00046         return 1;
00047 }
00048 

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