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right.c
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right.c
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/*
* Right() 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 software; see the file COPYING.txt. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA (or visit the web site https://www.gnu.org/).
*
* 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 "hbapiitm.h"
#include "hbapicdp.h"
#include "hbapierr.h"
/* returns the right-most n characters in string */
HB_FUNC( RIGHT )
{
PHB_ITEM pText = hb_param( 1, HB_IT_STRING );
if( pText && HB_ISNUM( 2 ) )
{
HB_ISIZ nLen = hb_parns( 2 );
if( nLen <= 0 )
hb_retc_null();
else
{
HB_SIZE nText = hb_itemGetCLen( pText );
if( ( HB_SIZE ) nLen < nText )
{
PHB_CODEPAGE cdp = hb_vmCDP();
if( HB_CDP_ISCHARIDX( cdp ) )
{
HB_SIZE nChars = hb_cdpTextLen( cdp, hb_itemGetCPtr( pText ), nText );
if( nChars > ( HB_SIZE ) nLen )
nLen = nText - hb_cdpTextPos( cdp, hb_itemGetCPtr( pText ), nText, nChars - nLen );
else
nLen = nText;
}
}
if( ( HB_SIZE ) nLen >= nText )
hb_itemReturn( pText );
else
hb_retclen( hb_itemGetCPtr( pText ) + nText - nLen, nLen );
}
}
else
hb_retc_null(); /* Clipper doesn't error */
}