harbour-core/harbour/contrib/libmisc/dates2.c

/*
 * $Id$
 */

/*
 * Harbour Project source code:
 * Additional date functions
 *
 * Copyright 1999 Jose Lalin <dezac@corevia.com>
 * www - http://www.harbour-project.org
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version, with one exception:
 *
 * The exception is that if you link the Harbour Runtime Library (HRL)
 * and/or the Harbour Virtual Machine (HVM) with other files to produce
 * an executable, this does not by itself cause the resulting executable
 * to be covered by the GNU General Public License. Your use of that
 * executable is in no way restricted on account of linking the HRL
 * and/or HVM code into it.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA (or visit
 * their web site at http://www.gnu.org/).
 *
 */

/*
 * The following parts are Copyright of the individual authors.
 * www - http://www.harbour-project.org
 *
 * Copyright 1999 Jon Berg <jmberg@pnh10.med.navy.mil>
 *    DateTime()
 *
 * See doc/license.txt for licensing terms.
 *
 */

#include <ctype.h>
#include <time.h>

#include "hbapi.h"
#include "hbapiitm.h"
#include "hbapilng.h"
#include "hbdate.h"

static int s_daysinmonth[ 12 ] =
{ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

BOOL hb_isleapyear( long lYear )
{
   HB_TRACE(HB_TR_DEBUG, ("hb_isleapyear(%ld)", lYear));

   return ( lYear % 4 == 0 && lYear % 100 != 0 ) || ( lYear % 400 == 0 );
}

long hb_daysinmonth( long lYear, long lMonth )
{
   HB_TRACE(HB_TR_DEBUG, ("hb_daysinmonth(%ld, %ld)", lYear, lMonth));

   if( lMonth > 0 && lMonth < 13 )
      return s_daysinmonth[ lMonth - 1 ] + 
             ( ( lMonth == 2 && hb_isleapyear( lYear ) ) ? 1 : 0 );
   else
      return 0;
}

long hb_doy( long lYear, long lMonth, long lDay )
{
   int i;
   int iDoy = 0;

   HB_TRACE(HB_TR_DEBUG, ("hb_doy(%ld, %ld, %ld)", lYear, lMonth, lDay));

   for( i = 1; i < lMonth; i++ )
      iDoy += hb_daysinmonth( lYear, i );

   return iDoy + lDay;
}

long hb_wom( long lYear, long lMonth, long lDay )
{
   int iWom;

   HB_TRACE(HB_TR_DEBUG, ("hb_wom(%ld, %ld, %ld)", lYear, lMonth, lDay));

   iWom = lDay + hb_dateDOW( lYear, lMonth, 1 ) - 1;
   if( iWom > 0 )
      return ( iWom - hb_dateDOW( lYear, lMonth, lDay ) ) / 7 + 1;
   else
      return 0;
}

long hb_woy( long lYear, long lMonth, long lDay, BOOL bISO )
{
   int iWeek, n;

   HB_TRACE(HB_TR_DEBUG, ("hb_woy(%ld, %ld, %ld, %d)", lYear, lMonth, lDay, (int) bISO));

   lDay = hb_doy( lYear, lMonth, lDay );
   n = ( ( ( 1 - ( bISO ? 1 : 0 ) ) % 7 ) ) - 1;
   lDay += ( n > 0 ) ? 1 : 0;
   iWeek = lDay / 7;
   if( bISO )
      iWeek += ( n < 4 ) ? 1 : 0;
   else
      ++iWeek;

   return iWeek;
}

HB_FUNC( AMONTHS )
{
   PHB_ITEM pReturn = hb_itemArrayNew( 12 );    /* Create array */
   int i;

   for( i = 0; i < 12; i++ )
   {
      PHB_ITEM pString = hb_itemPutC( NULL, ( char * ) hb_langDGetItem( HB_LANG_ITEM_BASE_MONTH + i ) );
      hb_itemArrayPut( pReturn, i+1, pString );
      hb_itemRelease( pString );
   }
   hb_itemReturn( pReturn );
   hb_itemRelease( pReturn );
}

HB_FUNC( ADAYS )
{
   PHB_ITEM pReturn = hb_itemArrayNew( 7 );    /* Create array */
   int i;

   for( i = 0; i < 7; i++ )
   {
      PHB_ITEM pString = hb_itemPutC( NULL, ( char * ) hb_langDGetItem( HB_LANG_ITEM_BASE_DAY + i ) );
      hb_itemArrayPut( pReturn, i + 1, pString );
      hb_itemRelease( pString );
   }
   hb_itemReturn( pReturn );
   hb_itemRelease( pReturn );
}

HB_FUNC( ISLEAPYEAR )
{
   PHB_ITEM pDate = hb_param( 1, HB_IT_DATE );

   if( pDate )
   {
      long lYear, lMonth, lDay;

      hb_dateDecode( hb_itemGetDL( pDate ), &lYear, &lMonth, &lDay );
      hb_retl( hb_isleapyear( lYear ) );
   }
   else
      hb_retl( FALSE );
}

HB_FUNC( DAYSINMONTH )
{
   PHB_ITEM pDate = hb_param( 1, HB_IT_DATE );

   if( pDate )
   {
      long lYear, lMonth, lDay;

      hb_dateDecode( hb_itemGetDL( pDate ), &lYear, &lMonth, &lDay );
      hb_retni( hb_daysinmonth( lYear, lMonth ) );
   }
   else
      hb_retni( 0 );
}

HB_FUNC( EOM )
{
   PHB_ITEM pDate = hb_param( 1, HB_IT_DATE );

   if( pDate )
   {
      long lYear, lMonth, lDay;

      hb_dateDecode( hb_itemGetDL( pDate ), &lYear, &lMonth, &lDay );
      hb_retd( lYear, lMonth, hb_daysinmonth( lYear, lMonth ) );
   }
   else
      hb_retdl( 0 );
}

HB_FUNC( BOM )
{
   PHB_ITEM pDate = hb_param( 1, HB_IT_DATE );

   if( pDate )
   {
      long lYear, lMonth, lDay;

      hb_dateDecode( hb_itemGetDL( pDate ), &lYear, &lMonth, &lDay );
      hb_retd( lYear, lMonth, 1 );
   }
   else
      hb_retdl( 0 );
}

HB_FUNC( WOM )
{
   PHB_ITEM pDate = hb_param( 1, HB_IT_DATE );

   if( pDate )
   {
      long lYear, lMonth, lDay;

      hb_dateDecode( hb_itemGetDL( pDate ), &lYear, &lMonth, &lDay );
      hb_retni( hb_wom( lYear, lMonth, lDay ) );
   }
   else
      hb_retni( 0 );
}

HB_FUNC( DOY )
{
   PHB_ITEM pDate = hb_param( 1, HB_IT_DATE );

   if( pDate )
   {
      long lYear, lMonth, lDay;

      hb_dateDecode( hb_itemGetDL( pDate ), &lYear, &lMonth, &lDay );
      hb_retni( hb_doy( lYear, lMonth, lDay ) );
   }
   else
      hb_retni( 0 );
}

/* Return the nWeek of the year (1 - 52, 0 - 52 if ISO) */

HB_FUNC( WOY )
{
   PHB_ITEM pDate = hb_param( 1, HB_IT_DATE );

   if( pDate )
   {
      long lYear, lMonth, lDay;

      hb_dateDecode( hb_itemGetDL( pDate ), &lYear, &lMonth, &lDay );
      hb_retni( hb_woy( lYear, lMonth, lDay, ISLOG( 2 ) ? hb_parl( 2 ) : TRUE ) );
   }
   else
      hb_retni( 0 );
}

HB_FUNC( EOY )
{
   PHB_ITEM pDate = hb_param( 1, HB_IT_DATE );

   if( pDate )
   {
      long lYear, lMonth, lDay;

      hb_dateDecode( hb_itemGetDL( pDate ), &lYear, &lMonth, &lDay );
      hb_retd( lYear, 12, 31 );
   }
   else
      hb_retdl( 0 );
}

HB_FUNC( BOY )
{
   PHB_ITEM pDate = hb_param( 1, HB_IT_DATE );

   if( pDate )
   {
      long lYear, lMonth, lDay;

      hb_dateDecode( hb_itemGetDL( pDate ), &lYear, &lMonth, &lDay );
      hb_retd( lYear, 1, 1 );
   }
   else
      hb_retdl( 0 );
}

HB_FUNC( DATETIME )
{
   time_t current_time;

   time( &current_time );

   hb_retc( ctime( &current_time ) );
}