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stuff.c
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stuff.c
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/*
* Stuff() function
*
* Copyright 2012 Przemyslaw Czerpak <druzus / at / priv.onet.pl>
* Copyright 1999 Antonio Linares <alinares@fivetech.com>
*
* 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 "hbapicdp.h"
/* replaces characters in a string */
HB_FUNC( STUFF )
{
const char * szText = hb_parc( 1 );
const char * szIns = hb_parc( 4 );
if( szText && szIns && HB_ISNUM( 2 ) && HB_ISNUM( 3 ) )
{
PHB_CODEPAGE cdp = hb_vmCDP();
HB_SIZE nLen = hb_parclen( 1 );
HB_SIZE nPos = hb_parns( 2 );
HB_SIZE nDel = hb_parns( 3 );
HB_SIZE nIns = hb_parclen( 4 );
HB_SIZE nTot;
if( HB_CDP_ISCHARIDX( cdp ) )
{
if( nPos )
nPos = nPos < 1 ? nLen : hb_cdpTextPos( cdp, szText, nLen, nPos - 1 );
if( nDel )
{
if( nPos < nLen )
{
nDel = hb_cdpTextPos( cdp, szText + nPos, nLen - nPos, nDel );
if( nDel == 0 )
nDel = nLen - nPos;
}
else
nDel = 0;
}
}
else
{
if( nPos )
{
if( nPos < 1 || nPos > nLen )
nPos = nLen;
else
nPos--;
}
if( nDel )
{
if( nDel < 1 || nDel > nLen - nPos )
nDel = nLen - nPos;
}
}
if( ( nTot = nLen + nIns - nDel ) > 0 )
{
char * szResult = ( char * ) hb_xgrab( nTot + 1 );
hb_xmemcpy( szResult, szText, nPos );
hb_xmemcpy( szResult + nPos, szIns, nIns );
hb_xmemcpy( szResult + nPos + nIns, szText + nPos + nDel,
nLen - ( nPos + nDel ) );
hb_retclen_buffer( szResult, nTot );
}
else
hb_retc_null();
}
else
hb_retc_null();
}