harbour-core/harbour/contrib/hbct/ctpad.c

/*
 * $Id$
 */

/*
 * Harbour Project source code:
 *   PADLEFT() and PADRIGHT() CT3 string functions
 *
 * Copyright 2001 IntTec GmbH, Neunlindenstr 32, 79106 Freiburg, Germany
 *        Author: Martin Vogel <vogel@inttec.de>
 *
 * www - http://harbour-project.org
 *
 * 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.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307 USA (or visit the web site http://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 "ct.h"

/* defines */
#define DO_PAD_PADLEFT     0
#define DO_PAD_PADRIGHT    1

/* helper function for the pad functions */
static void do_pad( int iSwitch )
{
   if( HB_ISCHAR( 1 ) && HB_ISNUM( 2 ) )
   {
      const char * pcString = hb_parc( 1 );
      HB_SIZE sStrLen = hb_parclen( 1 );
      char * pcRet, * pc;
      HB_ISIZ nRetLen;
      HB_SIZE sRetLen;
      char cFill;

      nRetLen = hb_parns( 2 );
      if( nRetLen <= 0 )
      {
         int iArgErrorMode = ct_getargerrormode();

         if( iArgErrorMode != CT_ARGERR_IGNORE )
         {
            ct_error( ( HB_USHORT ) iArgErrorMode, EG_ARG,
                      iSwitch == DO_PAD_PADLEFT ?
                      CT_ERROR_PADLEFT : CT_ERROR_PADRIGHT, NULL,
                      HB_ERR_FUNCNAME, 0, EF_CANDEFAULT,
                      HB_ERR_ARGS_BASEPARAMS );
         }
         hb_retc_null();
         return;
      }
      sRetLen = ( HB_SIZE ) nRetLen;

      if( hb_parclen( 3 ) > 0 )
         cFill = *( hb_parc( 3 ) );
      else if( HB_ISNUM( 3 ) )
         cFill = ( char ) ( hb_parnl( 3 ) % 256 );
      else
         cFill = 0x20;

      pcRet = ( char * ) hb_xgrab( sRetLen + 1 );

      if( iSwitch == DO_PAD_PADLEFT )
      {
         if( sRetLen > sStrLen )
         {
            /* fill with cFill */
            for( pc = pcRet; pc < pcRet + ( sRetLen - sStrLen ); pc++ )
               *pc = cFill;
            hb_xmemcpy( pcRet + ( sRetLen - sStrLen ), pcString, sStrLen );
         }
         else
         {
            hb_xmemcpy( pcRet, pcString + ( sStrLen - sRetLen ), sRetLen );
         }
      }
      else
      {
         hb_xmemcpy( pcRet, pcString, ( sRetLen < sStrLen ? sRetLen : sStrLen ) );
         if( sRetLen > sStrLen )
         {
            /* fill with cFill */
            for( pc = pcRet + sStrLen; pc < pcRet + sRetLen; pc++ )
               *pc = cFill;
         }
      }
      hb_retclen_buffer( pcRet, sRetLen );
   }
   else  /* HB_ISCHAR( 1 ) && HB_ISNUM( 2 ) */
   {
      PHB_ITEM pSubst = NULL;
      int iArgErrorMode = ct_getargerrormode();

      if( iArgErrorMode != CT_ARGERR_IGNORE )
      {
         pSubst = ct_error_subst( ( HB_USHORT ) iArgErrorMode, EG_ARG,
                                  iSwitch == DO_PAD_PADLEFT ?
                                  CT_ERROR_PADLEFT : CT_ERROR_PADRIGHT, NULL,
                                  HB_ERR_FUNCNAME, 0, EF_CANSUBSTITUTE,
                                  HB_ERR_ARGS_BASEPARAMS );
      }

      if( pSubst != NULL )
         hb_itemReturnRelease( pSubst );
      else
         hb_retc_null();
   }
}

HB_FUNC( PADLEFT )
{
   do_pad( DO_PAD_PADLEFT );
}

HB_FUNC( PADRIGHT )
{
   do_pad( DO_PAD_PADRIGHT );
}