mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-21 11:13:30 +00:00
77fbf8f246
two values, the latter does not tend to have sign extension and/or overflow bugs, and makes the code more obvious. While I'm there, make use of a macro which is derived from bin/ps/ps.c: ps_compat() to improve the readability of the code. Suggested by: bde MFC after: 1 week
77 lines
2.5 KiB
C
77 lines
2.5 KiB
C
/*-
|
|
* Copyright (c) 2002,2005 Marcel Moolenaar
|
|
* Copyright (c) 2002 Hiten Mahesh Pandya
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <string.h>
|
|
#include <uuid.h>
|
|
|
|
/* A macro used to improve the readability of uuid_compare(). */
|
|
#define DIFF_RETURN(a, b, field) do { \
|
|
if ((a)->field != (b)->field) \
|
|
return (((a)->field < (b)->field) ? -1 : 1); \
|
|
} while (0)
|
|
|
|
/*
|
|
* uuid_compare() - compare two UUIDs.
|
|
* See also:
|
|
* http://www.opengroup.org/onlinepubs/009629399/uuid_compare.htm
|
|
*
|
|
* NOTE: Either UUID can be NULL, meaning a nil UUID. nil UUIDs are smaller
|
|
* than any non-nil UUID.
|
|
*/
|
|
int32_t
|
|
uuid_compare(const uuid_t *a, const uuid_t *b, uint32_t *status)
|
|
{
|
|
int res;
|
|
|
|
if (status != NULL)
|
|
*status = uuid_s_ok;
|
|
|
|
/* Deal with NULL or equal pointers. */
|
|
if (a == b)
|
|
return (0);
|
|
if (a == NULL)
|
|
return ((uuid_is_nil(b, NULL)) ? 0 : -1);
|
|
if (b == NULL)
|
|
return ((uuid_is_nil(a, NULL)) ? 0 : 1);
|
|
|
|
/* We have to compare the hard way. */
|
|
DIFF_RETURN(a, b, time_low);
|
|
DIFF_RETURN(a, b, time_mid);
|
|
DIFF_RETURN(a, b, time_hi_and_version);
|
|
DIFF_RETURN(a, b, clock_seq_hi_and_reserved);
|
|
DIFF_RETURN(a, b, clock_seq_low);
|
|
|
|
res = memcmp(a->node, b->node, sizeof(a->node));
|
|
if (res)
|
|
return ((res < 0) ? -1 : 1);
|
|
return (0);
|
|
}
|
|
|
|
#undef DIFF_RETURN
|