102 lines
2.9 KiB
C
102 lines
2.9 KiB
C
/*
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* $Id$
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*/
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/*
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* Harbour Project source code:
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* MOD() function
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*
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* Copyright 1999 {list of individual authors and e-mail addresses}
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* www - http://www.harbour-project.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version, with one exception:
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*
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* The exception is that if you link the Harbour Runtime Library (HRL)
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* and/or the Harbour Virtual Machine (HVM) with other files to produce
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* an executable, this does not by itself cause the resulting executable
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* to be covered by the GNU General Public License. Your use of that
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* executable is in no way restricted on account of linking the HRL
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* and/or HVM code into it.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA (or visit
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* their web site at http://www.gnu.org/).
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*
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*/
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#include "hbapi.h"
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#include "hbapiitm.h"
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#include "hbapierr.h"
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/* NOTE: In Clipper this is written in Clipper, see the source below,
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and the error handling is NOT made here, but in the % operator.
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[vszakats] */
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/* NOTE: CA-Clipper is buggy since it relies on the fact that the errorhandler
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will silently handle zero division errors. [vszakats] */
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/* NOTE: This C version fully emulates the behaviour of the original
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CA-Cl*pper version, including bugs/side-effects. [vszakats] */
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HB_FUNC( MOD )
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{
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PHB_ITEM pNumber = hb_param( 1, IT_NUMERIC );
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if( pNumber && ISNUM( 2 ) )
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{
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double dNumber = hb_itemGetND( pNumber );
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double dBase = hb_parnd( 2 ); /* dBase! Cool! */
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if( dBase )
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{
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double dResult = dNumber - ( ( long ) ( dNumber / dBase ) * dBase );
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if( dResult * dBase < 0 )
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hb_retnd( dResult + dBase );
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else
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hb_retnd( dResult );
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}
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else
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{
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PHB_ITEM pResult = hb_errRT_BASE_Subst( EG_ZERODIV, 1341, NULL, "%" );
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if( pResult )
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{
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int iDec;
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hb_itemRelease( pResult );
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hb_itemGetNLen( pNumber, NULL, &iDec );
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hb_retndlen( dNumber, 0, iDec );
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}
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}
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}
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else
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{
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PHB_ITEM pResult = hb_errRT_BASE_Subst( EG_ARG, 1085, NULL, "%" );
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if( pResult )
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{
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hb_itemReturn( pResult );
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hb_itemRelease( pResult );
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}
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}
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}
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/*
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FUNCTION MOD( cl_num, cl_base )
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LOCAL cl_result := cl_num % cl_base
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RETURN IF( cl_base = 0, cl_num, iif( cl_result * cl_base < 0, cl_result + cl_base, cl_result ) )
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*/
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