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65393a863e
functions is expected for uuidgen(1), mca(8) and gpt(8). Given the generic use of UUIDs beyond the scope of the DCE 1.1 specification, visibility of the data structure at all levels of the machine, including firmware and the wish to not create a permanent build- time FreeBSD-ism for DCE compliant applications by creating a new library, it was decided that libc would be the least inappropriate place. Also, because the UUID functions live in libc under IRIX as well, we have maximized our portability and left as many options open as possible. This implementation introduces an extension not found in the specification: the status parameter is allowed to be a NULL- pointer. The reason for introducing the extension is because the status is almost never of any use. The manpage that's part of this commit is a minimal place-holder and is further fleshed-out in the near future. Approved by: re@ Contributed by: Hiten Mahesh Pandya <hiten@unixdaemons.com> Sponsored by: marcel :-) Tested on: alpha, i386, ia64
56 lines
2.0 KiB
C
56 lines
2.0 KiB
C
/*-
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* Copyright (c) 2002 Marcel Moolenaar
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* Copyright (c) 2002 Hiten Mahesh Pandya
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <uuid.h>
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/*
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* uuid_is_nil() - return whether the UUID is a nil UUID.
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* See also:
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* http://www.opengroup.org/onlinepubs/009629399/uuid_is_nil.htm
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* http://www.transarc.ibm.com/Library/documentation/dce/1.1/uuid_is_nil.html
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*/
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int32_t
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uuid_is_nil(uuid_t *u, uint32_t *status)
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{
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uint32_t *p;
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if (status)
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*status = uuid_s_ok;
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if (!u)
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return (1);
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/*
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* Pick the largest type that has equivalent alignment constraints
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* as an UUID and use it to test if the UUID consists of all zeroes.
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*/
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p = (uint32_t*)u;
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return ((p[0] == 0 && p[1] == 0 && p[2] == 0 && p[3] == 0) ? 1 : 0);
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}
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