/*
 * MemoTran() function
 *
 * Copyright 1999 Jose Lalin <dezac@corevia.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 "hbapiitm.h"

/* NOTE: pszResult must have an allocated buffer of at least nStringLen */

static HB_SIZE hb_strMemotran( char * pszResult, const char * pszString, HB_SIZE nStringLen, char cHardCR, char cSoftCR )
{
   HB_SIZE nStringPos = 0;
   HB_SIZE nResultPos = 0;

   HB_TRACE( HB_TR_DEBUG, ( "hb_strMemotran(%p, %s, %" HB_PFS "u, %x, %x)", ( void * ) pszResult, pszString, nStringLen, cHardCR, cSoftCR ) );

   while( nStringPos < nStringLen )
   {
      if(      pszString[ nStringPos ]     == HB_CHAR_HARD1 &&
               pszString[ nStringPos + 1 ] == HB_CHAR_HARD2 )
      {
         pszResult[ nResultPos++ ] = cHardCR;
         nStringPos += 2;
      }
      else if( pszString[ nStringPos ]     == HB_CHAR_SOFT1 &&
               pszString[ nStringPos + 1 ] == HB_CHAR_SOFT2 )
      {
         pszResult[ nResultPos++ ] = cSoftCR;
         nStringPos += 2;
      }
      else
         pszResult[ nResultPos++ ] = pszString[ nStringPos++ ];
   }

   pszResult[ nResultPos ] = '\0';

   return nResultPos;
}

HB_FUNC( MEMOTRAN )
{
   PHB_ITEM pString = hb_param( 1, HB_IT_STRING );

   if( pString )
   {
      HB_SIZE nLen = hb_itemGetCLen( pString );
      char * pszResult = ( char * ) hb_xgrab( nLen + 1 );
      const char * pszRepl;
      char cHardCR = ';';
      char cSoftCR = ' ';

      pszRepl = hb_parc( 2 );
      if( pszRepl )
         cHardCR = *pszRepl;

      /* CA-Cl*pper checks 3rd cSoftCR parameter only
       * if 2nd one cHardCR is specified [druzus]
       */
#ifdef HB_CLP_STRICT
      if( pszRepl )
#endif
      pszRepl = hb_parc( 3 );
      if( pszRepl )
         cSoftCR = *pszRepl;

      nLen = hb_strMemotran( pszResult, hb_itemGetCPtr( pString ), nLen,
                             cHardCR, cSoftCR );
      hb_retclen_buffer( pszResult, nLen );
   }
   else
      hb_retc_null();
}
