/*
 * $Id$
 */

/*
 * Harbour Project source code:
 *   REMALL(), REMLEFT() and REMRIGHT() 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_REMOVE_REMALL      0
#define DO_REMOVE_REMLEFT     1
#define DO_REMOVE_REMRIGHT    2

static const ULONG sulErrorSubcodes[3] = {CT_ERROR_REMALL,
                                          CT_ERROR_REMLEFT,
                                          CT_ERROR_REMRIGHT};
static const char * spcErrorOperation[3] = {"REMALL",
                                            "REMLEFT",
                                            "REMRIGHT"};

/* helper function for the remxxx functions */
static void do_remove (int iSwitch)
{

  /* param check */
  if (ISCHAR (1))
  {

    char *pcString = (char *)hb_parc (1);
    size_t sStrLen = (size_t)hb_parclen (1);
    char *pcRet, *pc;
    size_t sRetLen;
    char cSearch;
    
    if (hb_parclen (2) > 0)
      cSearch = *(hb_parc (2));
    else if (ISNUM (2))
      cSearch = hb_parnl (2) % 256;
    else
      cSearch = 0x20;

    sRetLen = sStrLen;
    pcRet = pcString;

    if (iSwitch != DO_REMOVE_REMRIGHT)
    {
      while ((*pcRet == cSearch) && (pcRet < pcString+sStrLen))
      {
        pcRet++;
        sRetLen--;
      }
    }

    if (iSwitch != DO_REMOVE_REMLEFT)
    {
      pc = pcString+sStrLen-1;
      while ((*pc == cSearch) && (pc >= pcRet))
      {
        pc--;
        sRetLen--;
      }
    }

    if (sRetLen == 0)
      hb_retc ("");
    else
      hb_retclen (pcRet, sRetLen);

  }
  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, sulErrorSubcodes[iSwitch],
                               NULL, (char *)spcErrorOperation[iSwitch], 0, EF_CANSUBSTITUTE, 2,
                               hb_paramError (1), hb_paramError (2));
    }
    
    if (pSubst != NULL)
    {
      hb_itemReturn (pSubst);
      hb_itemRelease (pSubst);
    }
    else
    {
      hb_retc ("");
    }
    return;
  }

  return;

}


/*  $DOC$
 *  $FUNCNAME$
 *      REMALL()
 *  $CATEGORY$
 *      CT3 string functions
 *  $ONELINER$
 *      Remove certain characters at the left and right of a string
 *  $SYNTAX$
 *      REMALL (<cString>, [<cSearch|nSearch>]) -> cString
 *  $ARGUMENTS$
 *  $RETURNS$
 *  $DESCRIPTION$
 *      TODO: add documentation
 *  $EXAMPLES$
 *  $TESTS$
 *  $STATUS$
 *      Started
 *  $COMPLIANCE$
 *      REMALL() is compatible with CT3's REMALL().
 *  $PLATFORMS$
 *      All
 *  $FILES$
 *      Source is remove.c, library is libct.
 *  $SEEALSO$
 *      REMLEFT(),REMRIGHT()
 *  $END$
 */

HB_FUNC (REMALL)
{

  do_remove (DO_REMOVE_REMALL);
  return;

}


/*  $DOC$
 *  $FUNCNAME$
 *      REMLEFT()
 *  $CATEGORY$
 *      CT3 string functions
 *  $ONELINER$
 *      Remove certain characters at the left of a string
 *  $SYNTAX$
 *      REMLEFT (<cString>, [<cSearch|nSearch>]) -> cString
 *  $ARGUMENTS$
 *  $RETURNS$
 *  $DESCRIPTION$
 *      TODO: add documentation
 *  $EXAMPLES$
 *  $TESTS$
 *  $STATUS$
 *      Started
 *  $COMPLIANCE$
 *      REMLEFT() is compatible with CT3's REMLEFT().
 *  $PLATFORMS$
 *      All
 *  $FILES$
 *      Source is remove.c, library is libct.
 *  $SEEALSO$
 *      REMALL(),REMRIGHT()
 *  $END$
 */

HB_FUNC (REMLEFT)
{

  do_remove (DO_REMOVE_REMLEFT);
  return;

}


/*  $DOC$
 *  $FUNCNAME$
 *      REMRIGHT()
 *  $CATEGORY$
 *      CT3 string functions
 *  $ONELINER$
 *      Remove certain characters at the right of a string
 *  $SYNTAX$
 *      REMRIGHT (<cString>, [<cSearch|nSearch>]) -> cString
 *  $ARGUMENTS$
 *  $RETURNS$
 *  $DESCRIPTION$
 *      TODO: add documentation
 *  $EXAMPLES$
 *  $TESTS$
 *  $STATUS$
 *      Started
 *  $COMPLIANCE$
 *      REMRIGHT() is compatible with CT3's REMRIGHT().
 *  $PLATFORMS$
 *      All
 *  $FILES$
 *      Source is remove.c, library is libct.
 *  $SEEALSO$
 *      REMALL(),REMLEFT()
 *  $END$
 */

HB_FUNC (REMRIGHT)
{

  do_remove (DO_REMOVE_REMRIGHT);
  return;

}