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

/*
 * $Id$
 */

/*
 * Harbour Project source code:
 *   COUNTLEFT() and COUNTRIGHT() 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_COUNT_COUNTLEFT     0
#define DO_COUNT_COUNTRIGHT    1

/* helper function for the countxxx functions */
static void do_count( int iSwitch )
{
   /* param check */
   if( ISCHAR( 1 ) )
   {
      char *pcString = hb_parc( 1 );
      size_t sStrLen = ( size_t ) hb_parclen( 1 );
      size_t sRetVal;
      char *pc;
      char cSearch;

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

      sRetVal = 0;

      switch ( iSwitch )
      {
         case DO_COUNT_COUNTLEFT:
            pc = pcString;
            while( ( *pc == cSearch ) && ( pc < pcString + sStrLen ) )
            {
               sRetVal++;
               pc++;
            }
            break;

         case DO_COUNT_COUNTRIGHT:
            pc = pcString + sStrLen - 1;
            while( ( *pc == cSearch ) && ( pc >= pcString ) )
            {
               sRetVal++;
               pc--;
            }
            break;
      }

      hb_retnl( sRetVal );
   }
   else  /* if( 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_COUNT_COUNTLEFT ?
                                  CT_ERROR_COUNTLEFT : CT_ERROR_COUNTRIGHT,
                                  NULL, &hb_errFuncName, 0, EF_CANSUBSTITUTE,
                                  HB_ERR_ARGS_BASEPARAMS );
      }

      if( pSubst != NULL )
         hb_itemReturnRelease( pSubst );
      else
         hb_retni( 0 );
   }
}


/*  $DOC$
 *  $FUNCNAME$
 *      COUNTLEFT()
 *  $CATEGORY$
 *      CT3 string functions
 *  $ONELINER$
 *      Count a certain character at the beginning of a string
 *  $SYNTAX$
 *      COUNTLEFT (<cString>, [<cSearch|nSearch>]) -> nCount
 *  $ARGUMENTS$
 *  $RETURNS$
 *  $DESCRIPTION$
 *      TODO: add documentation
 *  $EXAMPLES$
 *  $TESTS$
 *  $STATUS$
 *      Started
 *  $COMPLIANCE$
 *      COUNTLEFT() is compatible with CT3's COUNTLEFT().
 *  $PLATFORMS$
 *      All
 *  $FILES$
 *      Source is count.c, library is libct.
 *  $SEEALSO$
 *     COUNTRIGHT()
 *  $END$
 */

HB_FUNC( COUNTLEFT )
{
   do_count( DO_COUNT_COUNTLEFT );
}


/*  $DOC$
 *  $FUNCNAME$
 *      COUNTRIGHT()
 *  $CATEGORY$
 *      CT3 string functions
 *  $ONELINER$
 *      Count a certain character at the end of a string
 *  $SYNTAX$
 *      COUNTRIGHT (<cString>, [<cSearch|nSearch>]) -> nCount
 *  $ARGUMENTS$
 *  $RETURNS$
 *  $DESCRIPTION$
 *      TODO: add documentation
 *  $EXAMPLES$
 *  $TESTS$
 *  $STATUS$
 *      Started
 *  $COMPLIANCE$
 *      COUNTRIGHT() is compatible with CT3's COUNTRIGHT().
 *  $PLATFORMS$
 *      All
 *  $FILES$
 *      Source is count.c, library is libct.
 *  $SEEALSO$
 *     COUNTLEFT()
 *  $END$
 */

HB_FUNC( COUNTRIGHT )
{
   do_count( DO_COUNT_COUNTRIGHT );
}