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137 lines
4.6 KiB
C
137 lines
4.6 KiB
C
/*
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* Harbour Project source code:
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* At() 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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/* locates a substring in a string */
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HB_FUNC( HB_AT )
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{
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PHB_ITEM pSub = hb_param( 1, HB_IT_STRING );
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PHB_ITEM pText = hb_param( 2, HB_IT_STRING );
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if( pText && pSub )
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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_SIZE nTextLength = hb_itemGetCLen( pText );
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HB_SIZE nStart = hb_parns( 3 );
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HB_SIZE nFrom, nTo, nPos = 0;
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if( nStart <= 1 )
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nStart = nFrom = 0;
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else if( HB_CDP_ISCHARIDX( cdp ) )
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nFrom = hb_cdpTextPos( cdp, pszText, nTextLength, --nStart );
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else
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nFrom = --nStart;
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if( nFrom < nTextLength )
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{
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pszText += nFrom;
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nTextLength -= nFrom;
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if( HB_ISNUM( 4 ) )
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{
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nTo = hb_parns( 4 );
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if( nTo <= nStart )
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nTo = 0;
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else
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{
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nTo -= nStart;
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if( HB_CDP_ISCHARIDX( cdp ) )
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nTo = hb_cdpTextPos( cdp, pszText, nTextLength, nTo );
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if( nTo > nTextLength )
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nTo = nTextLength;
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}
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}
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else
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nTo = nTextLength;
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if( nTo > 0 )
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{
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nPos = hb_strAt( hb_itemGetCPtr( pSub ), hb_itemGetCLen( pSub ),
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pszText, nTo );
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if( nPos > 0 )
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{
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if( HB_CDP_ISCHARIDX( cdp ) )
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nPos = hb_cdpTextLen( cdp, pszText, nPos - 1 ) + 1 + nStart;
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else
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nPos += nFrom;
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}
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}
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}
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hb_retns( nPos );
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}
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else
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hb_errRT_BASE_SubstR( EG_ARG, 1108, NULL, HB_ERR_FUNCNAME, HB_ERR_ARGS_BASEPARAMS );
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}
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HB_FUNC( AT )
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{
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PHB_ITEM pSub = hb_param( 1, HB_IT_STRING );
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PHB_ITEM pText = hb_param( 2, HB_IT_STRING );
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if( pText && pSub )
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{
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HB_SIZE nPos = hb_strAt( hb_itemGetCPtr( pSub ), hb_itemGetCLen( pSub ),
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hb_itemGetCPtr( pText ), hb_itemGetCLen( pText ) );
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if( nPos )
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{
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PHB_CODEPAGE cdp = hb_vmCDP();
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if( HB_CDP_ISCHARIDX( cdp ) )
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nPos = hb_cdpTextLen( cdp, hb_itemGetCPtr( pText ), nPos - 1 ) + 1;
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}
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hb_retns( nPos );
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}
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else
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hb_errRT_BASE_SubstR( EG_ARG, 1108, NULL, HB_ERR_FUNCNAME, HB_ERR_ARGS_BASEPARAMS );
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}
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