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77 lines
2.5 KiB
C
77 lines
2.5 KiB
C
/*-
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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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