/*
 * $Id$
 */

/*
 * Harbour Project source code:
 *   RANGEREM() and RANGEREPL() 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"


/*  $DOC$
 *  $FUNCNAME$
 *      RANGEREM()
 *  $CATEGORY$
 *      CT3 string functions
 *  $ONELINER$
 *      Remove characters within a certain ASCII range from a string
 *  $SYNTAX$
 *      RANGEREM (<cChar1|nChar1>, <cChar2|nChar2>, <cString>) -> cString
 *  $ARGUMENTS$
 *  $RETURNS$
 *  $DESCRIPTION$
 *      TODO: add documentation
 *  $EXAMPLES$
 *      ? rangerem ("0","9","year2002.dbf") // "year.dbf", remove all digits
 *      ? rangerem ("9","0","year2002.dbf") // "22", testing removal from "9" to chr(255)
 *                                          // and from chr(0) to "0"
 *      ? rangerem ("0","9","yearcurr.dbf") // "yearcurr.dbf", test leaving string untouched
 *  $TESTS$
 *      rangerem ("0","9","year2002.dbf") == "year.dbf"     
 *      rangerem ("9","0","year2002.dbf") == "22"         
 *      rangerem ("0","9","yearcurr.dbf") == "yearcurr.dbf" 
 *  $STATUS$
 *      Started
 *  $COMPLIANCE$
 *      RANGEREM() is compatible with CT3's RANGEREM().
 *  $PLATFORMS$
 *      All
 *  $FILES$
 *      Source is range.c, library is libct.
 *  $SEEALSO$
 *      RANGEREPL()
 *  $END$
 */

HB_FUNC (RANGEREM)
{

  if (((hb_parclen (1) > 0) || ISNUM (1)) &&
      ((hb_parclen (2) > 0) || ISNUM (2)) &&
      ISCHAR (3))
  {
   
    char *pcString = (char *)hb_parc (3);
    size_t sStrLen = (size_t)hb_parclen (3);
    char *pcRet, *pc;
    unsigned char ucChar1, ucChar2;
    size_t sRetIndex;
    int iMode, iBool;

    if (ISNUM (1))
    {
      ucChar1 = hb_parnl (1)%256;
    }
    else
    {
      ucChar1 = *((unsigned char *)hb_parc (1));
    }

    if (ISNUM (2))
    {
      ucChar2 = hb_parnl (2)%256;
    }
    else
    {
      ucChar2 = *((unsigned char *)hb_parc (2));
    }

    iMode = (ucChar2 < ucChar1);

    pcRet = ( char * )hb_xgrab (sStrLen);
    sRetIndex = 0;
    for (pc = pcString; pc < pcString+sStrLen; pc++)
    {
      iBool = ((*pc) >= ucChar1);
      if (iMode)
      {
        iBool |= ((*pc) <= ucChar2);
      }
      else
      {
        iBool &= ((*pc) <= ucChar2);
      }

      if (!iBool)
      {
        *(pcRet+sRetIndex) = *pc;
        sRetIndex++;
      }
    }

    hb_retclen (pcRet, sRetIndex);
    hb_xfree (pcRet);

  }
  else /* ((hb_parclen (1) > 0) || ISNUM (1)) &&
          ((hb_parclen (2) > 0) || ISNUM (2)) &&
          ISCHAR (3)) */
  {
    PHB_ITEM pSubst = NULL;
    int iArgErrorMode = ct_getargerrormode();
    if (iArgErrorMode != CT_ARGERR_IGNORE)
    {
      pSubst = ct_error_subst ((USHORT)iArgErrorMode, EG_ARG, CT_ERROR_RANGEREM,
                               NULL, "RANGEREM", 0, EF_CANSUBSTITUTE, 3,
                               hb_paramError (1), hb_paramError (2),
                               hb_paramError (3));
    }
    
    if (pSubst != NULL)
    {
      hb_itemReturn (pSubst);
      hb_itemRelease (pSubst);
    }
    else
    {
      if (ISCHAR (3))
      {
        hb_retclen (hb_parc (3), hb_parclen (3));
      }
      else
      {
        hb_retc ("");
      }
    }
    return;
  }

  return;

}


/*  $DOC$
 *  $FUNCNAME$
 *      RANGEREPL
 *  $CATEGORY$
 *      CT3 string functions
 *  $ONELINER$
 *      Replace characters within a certain ASCII range from a string
 *  $SYNTAX$
 *      RANGEREPL (<cChar1|nChar1>, <cChar2|nChar2>,
 *                 <[@]cString>, <cReplacementChar|nReplacementChar>) -> cString
 *  $ARGUMENTS$
 *  $RETURNS$
 *  $DESCRIPTION$
 *      TODO: add documentation
 *  $EXAMPLES$
 *      ? rangerepl ("0","9","year2002.dbf","?") // "year????.dbf", replace all digits
 *      ? rangerepl ("9","0","year2002.dbf","?") // "????2??2????", testing replacement from "9" to chr(255)
 *                                               // and from chr(0) to "0"
 *      ? rangerepl ("0","9","yearcurr.dbf","?") // "yearcurr.dbf", test leaving string untouched
 *  $TESTS$
 *      rangerepl ("0","9","year2002.dbf","?") == "year????.dbf" 
 *      rangerepl ("9","0","year2002.dbf","?") == "????2??2????" 
 *      rangerepl ("0","9","yearcurr.dbf","?") == "yearcurr.dbf" 
 *  $STATUS$
 *      Started
 *  $COMPLIANCE$
 *      RANGEREPL() is compatible with CT3's RANGEREPL().
 *  $PLATFORMS$
 *      All
 *  $FILES$
 *      Source is range.c, library is libct.
 *  $SEEALSO$
 *      RANGEREM()
 *  $END$
 */

HB_FUNC (RANGEREPL)
{

  int iNoRef = ct_getref();

  if (((hb_parclen (1) > 0) || ISNUM (1)) &&
      ((hb_parclen (2) > 0) || ISNUM (2)) &&
      ISCHAR (3) &&
      ((hb_parclen (4) > 0) || ISNUM (4)))
  {
 
    char *pcString = (char *)hb_parc (3);
    size_t sStrLen = (size_t)hb_parclen (3);
    char *pcRet, *pc;
    unsigned char ucChar1, ucChar2, ucReplace;
    size_t sRetIndex;
    int iMode, iBool;

    if (ISNUM (1))
    {
      ucChar1 = hb_parnl (1)%256;
    }
    else
    {
      ucChar1 = *((unsigned char *)hb_parc (1));
    }

    if (ISNUM (2))
    {
      ucChar2 = hb_parnl (2)%256;
    }
    else
    {
      ucChar2 = *((unsigned char *)hb_parc (2));
    }

    if (ISNUM (4))
    {
      ucReplace = hb_parnl (4)%256;
    }
    else
    {
      ucReplace = *((unsigned char *)hb_parc (4));
    }

    iMode = (ucChar2 < ucChar1);

    pcRet = ( char * )hb_xgrab (sStrLen);
    sRetIndex = 0;
    for (pc = pcString; pc < pcString+sStrLen; pc++)
    {
      iBool = ((*pc) >= ucChar1);
      if (iMode)
      {
        iBool |= ((*pc) <= ucChar2);
      }
      else
      {
        iBool &= ((*pc) <= ucChar2);
      }

      if (iBool)
      {
        *(pcRet+sRetIndex) = ucReplace;
        sRetIndex++;
      }
      else
      {
        *(pcRet+sRetIndex) = *pc;
        sRetIndex++;
      }
    }

    if (ISBYREF (3))
    {
      hb_storclen (pcRet, sStrLen, 3);
    }

    if (iNoRef)
    {
      hb_ret();
    }
    else
    {
      hb_retclen (pcRet, sStrLen);
    }
    
    hb_xfree (pcRet);

  }
  else /* ((hb_parclen (1) > 0) || ISNUM (1)) &&
          ((hb_parclen (2) > 0) || ISNUM (2)) &&
          ISCHAR (3) &&
          ((hb_parclen (4) > 0))) */
  {
    PHB_ITEM pSubst = NULL;
    int iArgErrorMode = ct_getargerrormode();
    if (iArgErrorMode != CT_ARGERR_IGNORE)
    {
      pSubst = ct_error_subst ((USHORT)iArgErrorMode, EG_ARG, CT_ERROR_RANGEREPL,
                               NULL, "RANGEREPL", 0, EF_CANSUBSTITUTE, 4,
                               hb_paramError (1), hb_paramError (2),
                               hb_paramError (3), hb_paramError (4));
    }
    
    if (pSubst != NULL)
    {
      hb_itemReturn (pSubst);
      hb_itemRelease (pSubst);
    }
    else
    {
      if (iNoRef)
      {
        hb_ret();
      }
      else
      {
        if (ISCHAR (3))
        {
          hb_retclen (hb_parc (3), hb_parclen (3));
        }
        else
        {
          hb_retc ("");
        }
      }
    }
    return;
  
  }

  return;

}