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117 lines
3.9 KiB
C
117 lines
3.9 KiB
C
/*
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* Harbour Project source code:
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* SubStr() function
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*
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* Copyright 2012 Przemyslaw Czerpak <druzus / at / priv.onet.pl>
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* Copyright 1999 Antonio Linares <alinares@fivetech.com>
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* www - http://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, or (at your option)
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* any later version.
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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 software; see the file COPYING.txt. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA (or visit the web site http://www.gnu.org/).
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*
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* As a special exception, the Harbour Project gives permission for
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* additional uses of the text contained in its release of Harbour.
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*
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* The exception is that, if you link the Harbour libraries with other
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* files to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the Harbour library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the Harbour
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* Project under the name Harbour. If you copy code from other
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* Harbour Project or Free Software Foundation releases into a copy of
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* Harbour, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for Harbour, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice.
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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 "hbapicdp.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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int iPCount = hb_pcount();
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if( pText && HB_ISNUM( 2 ) && ( iPCount < 3 || HB_ISNUM( 3 ) ) )
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{
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PHB_CODEPAGE cdp = hb_vmCDP();
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const char * pszText = hb_itemGetCPtr( pText );
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HB_ISIZ nSize = hb_itemGetCLen( pText );
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HB_ISIZ nFrom = hb_parns( 2 );
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HB_ISIZ nCount = iPCount < 3 ? nSize : hb_parns( 3 );
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if( nFrom > 0 )
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{
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if( --nFrom > nSize )
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nCount = 0;
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}
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if( nCount > 0 )
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{
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if( HB_CDP_ISCHARIDX( cdp ) )
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{
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if( nFrom < 0 )
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nFrom += hb_cdpTextLen( cdp, pszText, nSize );
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if( nFrom > 0 )
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{
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nFrom = hb_cdpTextPos( cdp, pszText, nSize, nFrom );
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pszText += nFrom;
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nSize -= nFrom;
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}
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nCount = hb_cdpTextPos( cdp, pszText, nSize, nCount );
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}
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else
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{
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if( nFrom < 0 )
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nFrom += nSize;
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if( nFrom > 0 )
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{
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pszText += nFrom;
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nSize -= nFrom;
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}
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if( nCount > nSize )
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nCount = nSize;
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}
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}
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if( nCount > 0 )
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{
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if( nFrom <= 0 && nCount == nSize )
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hb_itemReturn( pText );
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else
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hb_retclen( pszText, nCount );
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}
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else
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hb_retc_null();
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}
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else
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hb_errRT_BASE_SubstR( EG_ARG, 1110, NULL, HB_ERR_FUNCNAME, HB_ERR_ARGS_BASEPARAMS );
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}
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