95 lines
2.6 KiB
C
95 lines
2.6 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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* SUBSTR() function
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*
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* Copyright 1999 Antonio Linares <alinares@fivetech.com>
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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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/* returns l characters from n characters into string */
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HB_FUNC( SUBSTR )
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{
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PHB_ITEM pText = hb_param( 1, HB_IT_STRING );
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if( pText && ISNUM( 2 ) )
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{
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long lPos = hb_parnl( 2 );
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if( lPos < 0 )
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{
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lPos += ( long ) hb_itemGetCLen( pText );
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if( lPos < 0 )
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lPos = 0;
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}
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else if( lPos )
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{
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lPos--;
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}
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if( lPos < ( long ) hb_itemGetCLen( pText ) )
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{
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long lLen;
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if( hb_pcount() >= 3 )
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{
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if( ISNUM( 3 ) )
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{
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lLen = hb_parnl( 3 );
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if( lLen > ( long ) hb_itemGetCLen( pText ) - lPos )
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lLen = ( long ) hb_itemGetCLen( pText ) - lPos;
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}
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else
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{
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hb_errRT_BASE_SubstR( EG_ARG, 1110, NULL, "SUBSTR" );
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/* NOTE: Exit from inside [vszakats] */
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return;
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}
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}
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else
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lLen = ( long ) hb_itemGetCLen( pText ) - lPos;
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if( lLen > 0 )
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hb_retclen( hb_itemGetCPtr( pText ) + lPos, lLen );
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else
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hb_retc( "" );
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}
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else
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hb_retc( "" );
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}
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else
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hb_errRT_BASE_SubstR( EG_ARG, 1110, NULL, "SUBSTR" );
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}
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