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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/lib/libc/uuid/uuid_compare.c
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/*-

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 * SPDX-License-Identifier: BSD-2-Clause

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 *

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 * Copyright (c) 2002,2005 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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#include <string.h>

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#include <uuid.h>

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/* A macro used to improve the readability of uuid_compare(). */

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#define DIFF_RETURN(a, b, field)	do {			\

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	if ((a)->field != (b)->field)				\

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		return (((a)->field < (b)->field) ? -1 : 1);	\

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} while (0)

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/*

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 * uuid_compare() - compare two UUIDs.

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 * See also:

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 *	http://www.opengroup.org/onlinepubs/009629399/uuid_compare.htm

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 *

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 * NOTE: Either UUID can be NULL, meaning a nil UUID. nil UUIDs are smaller

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 *	 than any non-nil UUID.

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 */

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int32_t

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uuid_compare(const uuid_t *a, const uuid_t *b, uint32_t *status)

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{

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	int	res;

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	if (status != NULL)

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		*status = uuid_s_ok;

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	/* Deal with NULL or equal pointers. */

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	if (a == b)

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		return (0);

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	if (a == NULL)

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		return ((uuid_is_nil(b, NULL)) ? 0 : -1);

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	if (b == NULL)

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		return ((uuid_is_nil(a, NULL)) ? 0 : 1);

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	/* We have to compare the hard way. */

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	DIFF_RETURN(a, b, time_low);

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	DIFF_RETURN(a, b, time_mid);

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	DIFF_RETURN(a, b, time_hi_and_version);

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	DIFF_RETURN(a, b, clock_seq_hi_and_reserved);

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	DIFF_RETURN(a, b, clock_seq_low);

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	res = memcmp(a->node, b->node, sizeof(a->node));

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	if (res)

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		return ((res < 0) ? -1 : 1);

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	return (0);

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}

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#undef DIFF_RETURN

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