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charswap.c
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charswap.c
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/*
* CT3 string functions
* - CharSwap()
* - WordSwap()
*
* Copyright 2001 IntTec GmbH, Neunlindenstr 32, 79106 Freiburg, Germany
* Author: Martin Vogel <vogel@inttec.de>
*
* 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 "ct.h"
/* defines */
#define DO_CHARSWAP_CHARSWAP 0
#define DO_CHARSWAP_WORDSWAP 1
#define DO_CHARSWAP_WORDSWAP_CHARSWAP 2
/* helper function for the CharSwap() and WordSwap() functions */
static void do_charswap( int iSwitch )
{
/* suppress return value ? */
int iNoRet = ct_getref() && HB_ISBYREF( 1 );
/* param check */
if( HB_ISCHAR( 1 ) )
{
const char * pcString = hb_parc( 1 );
HB_SIZE sStrLen = hb_parclen( 1 );
char * pcRet;
HB_SIZE sRetIndex = 0;
int iShift, iMod;
const char * pcSub;
if( sStrLen == 0 )
{
if( iNoRet )
hb_ret();
else
hb_retc_null();
return;
}
if( iSwitch == DO_CHARSWAP_WORDSWAP )
{
iShift = 4;
if( hb_parl( 2 ) )
iSwitch = DO_CHARSWAP_WORDSWAP_CHARSWAP;
}
else
iShift = 2;
pcRet = ( char * ) hb_xgrab( sStrLen );
for( pcSub = pcString; pcSub < pcString + sStrLen + 1 - iShift; pcSub += iShift )
{
switch( iSwitch )
{
case DO_CHARSWAP_WORDSWAP:
pcRet[ sRetIndex++ ] = pcSub[ 2 ];
pcRet[ sRetIndex++ ] = pcSub[ 3 ];
pcRet[ sRetIndex++ ] = pcSub[ 0 ];
pcRet[ sRetIndex++ ] = pcSub[ 1 ];
break;
case DO_CHARSWAP_WORDSWAP_CHARSWAP:
pcRet[ sRetIndex++ ] = pcSub[ 3 ];
pcRet[ sRetIndex++ ] = pcSub[ 2 ];
/* fallthrough */
case DO_CHARSWAP_CHARSWAP:
pcRet[ sRetIndex++ ] = pcSub[ 1 ];
pcRet[ sRetIndex++ ] = pcSub[ 0 ];
}
}
/* copy rest of string */
if( iSwitch == DO_CHARSWAP_WORDSWAP || iSwitch == DO_CHARSWAP_WORDSWAP_CHARSWAP )
iMod = sStrLen % 4;
else
iMod = sStrLen % 2;
for( pcSub = pcString + sStrLen - iMod; pcSub < pcString + sStrLen; pcSub++ )
pcRet[ sRetIndex++ ] = *pcSub;
/* return string */
hb_storclen( pcRet, sRetIndex, 1 );
if( iNoRet )
hb_retl( HB_FALSE );
else
hb_retclen( pcRet, sRetIndex );
hb_xfree( pcRet );
}
else
{
PHB_ITEM pSubst = NULL;
int iArgErrorMode = ct_getargerrormode();
if( iArgErrorMode != CT_ARGERR_IGNORE )
{
if( iSwitch == DO_CHARSWAP_CHARSWAP )
pSubst = ct_error_subst( ( HB_USHORT ) iArgErrorMode, EG_ARG,
CT_ERROR_CHARSWAP,
NULL, HB_ERR_FUNCNAME, 0, EF_CANSUBSTITUTE,
HB_ERR_ARGS_BASEPARAMS );
else
pSubst = ct_error_subst( ( HB_USHORT ) iArgErrorMode, EG_ARG,
CT_ERROR_WORDSWAP,
NULL, HB_ERR_FUNCNAME, 0, EF_CANSUBSTITUTE,
HB_ERR_ARGS_BASEPARAMS );
}
if( pSubst != NULL )
hb_itemReturnRelease( pSubst );
else if( iNoRet )
hb_retl( HB_FALSE );
else
hb_retc_null();
}
}
HB_FUNC( CHARSWAP )
{
do_charswap( DO_CHARSWAP_CHARSWAP );
}
HB_FUNC( WORDSWAP )
{
do_charswap( DO_CHARSWAP_WORDSWAP );
}