/*
 * $Id$
 */

/*
 * Harbour Project source code:
 *
 *   CT3 Numeric functions - PART 1
 *     - CELSIUS
 *     - FAHRENHEIT
 *     - INFINITY
 *
 * NOTE: All these functions were builded using Borland C++ 5.5 (free version)
 *
 * Copyright 2001  Alejandro de Garate  <alex_degarate@hotmail.com>
 *
 * Documentation and changes concerning error handling Copyright 2001
 *   IntTec GmbH, Freiburg, Germany, Author: Martin Vogel <vogel@inttec.de>
 *
 * www - http://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, or (at your option)
 * any later version.
 *
 * 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 software; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307 USA (or visit the web site http://www.gnu.org/).
 *
 * As a special exception, the Harbour Project gives permission for
 * additional uses of the text contained in its release of Harbour.
 *
 * The exception is that, if you link the Harbour libraries 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 Harbour library code into it.
 *
 * This exception does not however invalidate any other reasons why
 * the executable file might be covered by the GNU General Public License.
 *
 * This exception applies only to the code released by the Harbour
 * Project under the name Harbour.  If you copy code from other
 * Harbour Project or Free Software Foundation releases into a copy of
 * Harbour, as the General Public License permits, the exception does
 * not apply to the code that you add in this way.  To avoid misleading
 * anyone as to the status of such modified files, you must delete
 * this exception notice from them.
 *
 * If you write modifications of your own for Harbour, it is your choice
 * whether to permit this exception to apply to your modifications.
 * If you do not wish that, delete this exception notice.
 *
 */

#include "ct.h"
#include "ctmath.h"
#include <float.h>

HB_FUNC( CELSIUS )
{
   if( HB_ISNUM( 1 ) )
   {
      double dInput = hb_parnd( 1 );
      double dResult;

      dResult = ( 5.0 / 9.0 ) * ( dInput - 32.0 );
      hb_retnd( dResult );
   }
   else
   {
      PHB_ITEM pSubst = NULL;
      int iArgErrorMode = ct_getargerrormode();

      if( iArgErrorMode != CT_ARGERR_IGNORE )
      {
         pSubst = ct_error_subst( ( HB_USHORT ) iArgErrorMode, EG_ARG,
                                  CT_ERROR_CELSIUS, NULL, HB_ERR_FUNCNAME, 0,
                                  EF_CANSUBSTITUTE, HB_ERR_ARGS_BASEPARAMS );
      }

      if( pSubst != NULL )
         hb_itemReturnRelease( pSubst );
      else
         hb_retnd( 0.0 );
   }
}

HB_FUNC( FAHRENHEIT )
{
   if( HB_ISNUM( 1 ) )
   {
      double dInput = hb_parnd( 1 );
      double dResult;

      dResult = ( ( 9.0 / 5.0 ) * dInput ) + 32.0;
      hb_retnd( dResult );
   }
   else
   {
      PHB_ITEM pSubst = NULL;
      int iArgErrorMode = ct_getargerrormode();

      if( iArgErrorMode != CT_ARGERR_IGNORE )
      {
         pSubst = ct_error_subst( ( HB_USHORT ) iArgErrorMode, EG_ARG,
                                  CT_ERROR_FAHRENHEIT, NULL, HB_ERR_FUNCNAME, 0,
                                  EF_CANSUBSTITUTE, HB_ERR_ARGS_BASEPARAMS );
      }

      if( pSubst != NULL )
         hb_itemReturnRelease( pSubst );
      else
         hb_retnd( 0.0 );
   }
}

HB_FUNC( INFINITY )
{
   if( hb_parl( 1 ) )
      hb_retnd( DBL_MAX );
   else
      hb_retnd( 93786976294838206460.00 );
}