harbour-core/harbour/contrib/libct/justify.c

/*
 * $Id$
 */

/*
 * Harbour Project source code:
 *   JUSTLEFT() and JUSTRIGHT() CT3 string functions
 *
 * Copyright 2001 IntTec GmbH, Neunlindenstr 32, 79106 Freiburg, Germany
 *        Author: Martin Vogel <vogel@inttec.de>
 *
 * www - http://www.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_JUSTIFY_JUSTLEFT   0
#define DO_JUSTIFY_JUSTRIGHT  1

/* helper function for the justxxx() functions */
static void do_justify( int iSwitch )
{

   int iNoRet;

   iNoRet = ct_getref() && ISBYREF( 1 );

   if( ISCHAR( 1 ) )
   {

      char *pcString = hb_parc( 1 );
      size_t sStrLen = hb_parclen( 1 );
      char cJustChar;
      char *pc, *pcRet;
      size_t sJustOffset;

      if( sStrLen == 0 )
      {
         if( iNoRet )
            hb_ret();
         else
            hb_retc( NULL );
         return;
      }

      if( hb_parclen( 2 ) > 0 )
         cJustChar = *( hb_parc( 2 ) );
      else if( ISNUM( 2 ) )
         cJustChar = ( char ) ( hb_parnl( 2 ) % 256 );
      else
         cJustChar = 0x20;

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

      switch ( iSwitch )
      {
         case DO_JUSTIFY_JUSTLEFT:
            pc = pcString;
            sJustOffset = 0;
            while( ( *pc == cJustChar ) && ( pc < pcString + sStrLen ) )
            {
               sJustOffset++;
               pc++;
            }
            hb_xmemcpy( pcRet, pcString + sJustOffset, sStrLen - sJustOffset );
            for( pc = pcRet + sStrLen - sJustOffset; pc < pcRet + sStrLen; pc++ )
            {
               *pc = cJustChar;
            }
            break;

         case DO_JUSTIFY_JUSTRIGHT:
            pc = pcString + sStrLen - 1;
            sJustOffset = 0;
            while( ( *pc == cJustChar ) && ( pc >= pcString ) )
            {
               sJustOffset++;
               pc--;
            }
            for( pc = pcRet; pc < pcRet + sJustOffset; pc++ )
            {
               *pc = cJustChar;
            }
            hb_xmemcpy( pcRet + sJustOffset, pcString, sStrLen - sJustOffset );
            break;
      }

      if( ISBYREF( 1 ) )
         hb_storclen( pcRet, sStrLen, 1 );

      if( iNoRet )
      {
         hb_ret();
         hb_xfree( pcRet );
      }
      else
         hb_retclen_buffer( pcRet, sStrLen );
   }
   else  /* ISCHAR( 1 ) */
   {
      PHB_ITEM pSubst = NULL;
      int iArgErrorMode = ct_getargerrormode();

      if( iArgErrorMode != CT_ARGERR_IGNORE )
      {
         pSubst = ct_error_subst( ( USHORT ) iArgErrorMode, EG_ARG,
                                  iSwitch == DO_JUSTIFY_JUSTLEFT ?
                                  CT_ERROR_JUSTLEFT : CT_ERROR_JUSTRIGHT,
                                  NULL, &hb_errFuncName, 0,
                                  EF_CANSUBSTITUTE, HB_ERR_ARGS_BASEPARAMS );
      }

      if( pSubst != NULL )
         hb_itemReturnRelease( pSubst );
      else if( iNoRet )
         hb_ret();
      else
         hb_retc( NULL );
   }
}


/*  $DOC$
 *  $FUNCNAME$
 *      JUSTLEFT()
 *  $CATEGORY$
 *      CT3 string functions
 *  $ONELINER$
 *      Move characters from the beginning to the end of a string
 *  $SYNTAX$
 *      JUSTLEFT (<[@]cString>, [<cChar>|<nChar>]) -> cJustifiedString
 *  $ARGUMENTS$
 *  $RETURNS$
 *  $DESCRIPTION$
 *      TODO: add documentation
 *  $EXAMPLES$
 *  $TESTS$
 *  $STATUS$
 *      Started
 *  $COMPLIANCE$
 *      JUSTLEFT() is compatible with CT3's JUSTLEFT().
 *  $PLATFORMS$
 *      All
 *  $FILES$
 *      Source is justify.c, library is libct.
 *  $SEEALSO$
 *      JUSTRIGHT()
 *  $END$
 */

HB_FUNC( JUSTLEFT )
{
   do_justify( DO_JUSTIFY_JUSTLEFT );
}


/*  $DOC$
 *  $FUNCNAME$
 *      JUSTRIGHT()
 *  $CATEGORY$
 *      Harbour Tools string functions
 *  $ONELINER$
 *      Move characters from the end to the beginning of a string
 *  $SYNTAX$
 *      JUSTRIGHT (<[@]cString>, [<cChar>|<nChar>]) -> cJustifiedString
 *  $ARGUMENTS$
 *  $RETURNS$
 *  $DESCRIPTION$
 *      TODO: add documentation
 *  $EXAMPLES$
 *  $TESTS$
 *  $STATUS$
 *      Started
 *  $COMPLIANCE$
 *      JUSTRIGHT() is compatible with CT3's JUSTRIGHT().
 *  $PLATFORMS$
 *      All
 *  $FILES$
 *      Source is justify.c, library is libct.
 *  $SEEALSO$
 *      JUSTLEFT()
 *  $END$
 */

HB_FUNC( JUSTRIGHT )
{
   do_justify( DO_JUSTIFY_JUSTRIGHT );
}