Função Mod do harbour
/*
* Mod() function
*
* Copyright 1999 Matthew Hamilton <mhamilton@bunge.com.au>
*
* 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 program; see the file LICENSE.txt. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA (or visit https://www.gnu.org/licenses/).
*
* 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 "hbapi.h"
#include "hbapiitm.h"
#include "hbapierr.h"
#include "hbmath.h"
/* NOTE: In CA-Cl*pper this is written in Clipper, see the source below,
and the error handling is NOT made here, but in the % operator.
[vszakats] */
/* NOTE: CA-Cl*pper is buggy since it relies on the fact that the errorhandler
will silently handle zero division errors. [vszakats] */
/* NOTE: This C version fully emulates the behaviour of the original
CA-Cl*pper version, including bugs/side-effects. [vszakats] */
HB_FUNC( MOD )
{
PHB_ITEM pNumber = hb_param( 1, HB_IT_NUMERIC );
PHB_ITEM pBase = hb_param( 2, HB_IT_NUMERIC );
if( pNumber && pBase )
{
double dNumber = hb_itemGetND( pNumber );
double dBase = hb_itemGetND( pBase ); /* dBase! Cool! */
if( dBase )
{
double dResult = fmod( dNumber, dBase );
if( dResult && ( dNumber > 0 ? dBase < 0 : dBase > 0 ) )
dResult += dBase;
hb_retnd( dResult );
}
else
{
PHB_ITEM pResult = hb_errRT_BASE_Subst( EG_ZERODIV, 1341, NULL, "%", HB_ERR_ARGS_BASEPARAMS );
/* In CA-Cl*pper Mod() function ignores substitution result
* and return original numeric item keeping its internal
* representation: integer or double, size and number of
* decimal places, it can be seen in code like:
* PROCEDURE Main()
* Set( _SET_FIXED, .T. )
* ? Transform( Mod( 12345, 0 ), "" )
* RETURN
*
* [druzus]
*/
if( pResult )
{
hb_itemReturn( pNumber );
hb_itemRelease( pResult );
}
}
}
else
hb_errRT_BASE_SubstR( EG_ARG, 1085, NULL, "%", 2, hb_param( 1, HB_IT_ANY ), hb_param( 2, HB_IT_ANY ) );
}
/*
FUNCTION Mod( cl_num, cl_base )
LOCAL cl_result := cl_num % cl_base
RETURN iif( cl_base = 0, cl_num, iif( cl_result * cl_base < 0, cl_result + cl_base, cl_result ) )
*/