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kolibrios/programs/develop/open watcom/trunk/clib/time/leapyear.c

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/****************************************************************************
*
* Open Watcom Project
*
* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
* ========================================================================
*
* This file contains Original Code and/or Modifications of Original
* Code as defined in and that are subject to the Sybase Open Watcom
* Public License version 1.0 (the 'License'). You may not use this file
* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
* provided with the Original Code and Modifications, and is also
* available at www.sybase.com/developer/opensource.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
* NON-INFRINGEMENT. Please see the License for the specific language
* governing rights and limitations under the License.
*
* ========================================================================
*
* Description: Check if a year is a leap year + associated arrays
*
****************************************************************************/
#include "variety.h"
#include <time.h>
#include "rtdata.h"
#include "timedata.h"
short const __based(__segname("_CONST")) __diyr[] = { /* days in normal year array */
0, /* Jan */
31, /* Feb */
31 + 28, /* Mar */
31 + 28 + 31, /* Apr */
31 + 28 + 31 + 30, /* May */
31 + 28 + 31 + 30 + 31, /* Jun */
31 + 28 + 31 + 30 + 31 + 30, /* Jul */
31 + 28 + 31 + 30 + 31 + 30 + 31, /* Aug */
31 + 28 + 31 + 30 + 31 + 30 + 31 + 31, /* Sep */
31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30, /* Oct */
31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31, /* Nov */
31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30, /* Dec */
31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31 /* Jan, next year */
};
short const __based(__segname("_CONST")) __dilyr[] = { /* days in leap year array */
0, /* Jan */
31, /* Feb */
31 + 29, /* Mar */
31 + 29 + 31, /* Apr */
31 + 29 + 31 + 30, /* May */
31 + 29 + 31 + 30 + 31, /* Jun */
31 + 29 + 31 + 30 + 31 + 30, /* Jul */
31 + 29 + 31 + 30 + 31 + 30 + 31, /* Aug */
31 + 29 + 31 + 30 + 31 + 30 + 31 + 31, /* Sep */
31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30, /* Oct */
31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31, /* Nov */
31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30, /* Dec */
31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31 /* Jan, next year */
};
int __leapyear( unsigned year )
{
if( year & 3 )
return( 0 );
if( ( year % 100 ) != 0 )
return( 1 );
if( ( year % 400 ) == 0 )
return( 1 );
return( 0 );
}