9f16c2bf8e
* *
* update copyright headers with new FSF postal address
* COPYING.txt -> LICENSE.txt (rest of repo to be synced)
135 lines
4.4 KiB
C
135 lines
4.4 KiB
C
/*
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* AddAscii() CT3 string function
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*
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* Copyright 2001 IntTec GmbH, Neunlindenstr 32, 79106 Freiburg, Germany
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* Author: Martin Vogel <vogel@inttec.de>
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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 program; see the file LICENSE.txt. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA (or visit https://www.gnu.org/licenses/).
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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 "ct.h"
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HB_FUNC( ADDASCII )
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{
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/* suppressing return value ? */
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int iNoRet = ct_getref() && HB_ISBYREF( 1 );
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if( HB_ISCHAR( 1 ) )
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{
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const char * pcSource = hb_parc( 1 );
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HB_SIZE sLen = hb_parclen( 1 );
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char * pcResult;
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HB_SIZE sPos = hb_parnsdef( 3, sLen );
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HB_LONG lValue;
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int iCarryOver;
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if( sPos > sLen || ! HB_ISNUM( 2 ) || sLen == 0 )
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{
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int iArgErrorMode = ct_getargerrormode();
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if( iArgErrorMode != CT_ARGERR_IGNORE )
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ct_error( ( HB_USHORT ) iArgErrorMode, EG_ARG, CT_ERROR_ADDASCII, NULL,
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HB_ERR_FUNCNAME, 0, EF_CANDEFAULT, HB_ERR_ARGS_BASEPARAMS );
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/* return string unchanged */
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if( iNoRet )
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hb_retl( HB_FALSE );
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else
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hb_retclen( pcSource, sLen );
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return;
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}
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pcResult = ( char * ) hb_xgrab( sLen + 1 );
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hb_xmemcpy( pcResult, pcSource, sLen );
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lValue = hb_parnl( 2 );
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iCarryOver = hb_parldef( 4, 0 );
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if( iCarryOver )
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{
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HB_SIZE sCurrent;
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HB_LONG lResult;
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for( sCurrent = sPos; sCurrent > 0 && lValue != 0; sCurrent-- )
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{
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lResult = ( HB_LONG ) pcSource[ sCurrent - 1 ] + ( lValue % 256 );
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lValue /= 256;
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if( lResult > 255 )
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lValue++;
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else if( lResult < 0 )
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lValue--;
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pcResult[ sCurrent - 1 ] = ( char ) ( lResult % 256 );
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}
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}
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else
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pcResult[ sPos - 1 ] = ( char ) ( ( ( HB_LONG ) pcResult[ sPos - 1 ] + lValue ) % 256 );
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hb_storclen( pcResult, sLen, 1 );
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if( iNoRet )
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{
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hb_retl( HB_FALSE );
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hb_xfree( pcResult );
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}
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else
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hb_retclen_buffer( pcResult, sLen );
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}
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else
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{
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PHB_ITEM pSubst = NULL;
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int iArgErrorMode = ct_getargerrormode();
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if( iArgErrorMode != CT_ARGERR_IGNORE )
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pSubst = ct_error_subst( ( HB_USHORT ) iArgErrorMode, EG_ARG, CT_ERROR_ADDASCII,
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NULL, HB_ERR_FUNCNAME, 0, EF_CANSUBSTITUTE, HB_ERR_ARGS_BASEPARAMS );
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if( pSubst != NULL )
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hb_itemReturnRelease( pSubst );
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else if( iNoRet )
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hb_retl( HB_FALSE );
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else
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hb_retc_null();
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}
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}
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