/*
 * $Id$
 */

/*
 * Harbour Project source code:
 *   NUMAT() CT3 string function
 *
 * 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"


/*  $DOC$
 *  $FUNCNAME$
 *      NUMAT()
 *  $CATEGORY$
 *      CT3 string functions
 *  $ONELINER$
 *      Number of occurrences of a sequence in a string
 *  $SYNTAX$
 *      NUMAT (<cStringToMatch>, <cString>, [<nIgnore>]) --> nCount
 *  $ARGUMENTS$
 *  $RETURNS$
 *  $DESCRIPTION$
 *      TODO: add documentation
 *  $EXAMPLES$
 *  $TESTS$
 *  $STATUS$
 *      Started
 *  $COMPLIANCE$
 *      NUMAT() is compatible with CT3's NUMAT().
 *  $PLATFORMS$
 *      All
 *  $FILES$
 *      Source is numat.c, library is libct.
 *  $SEEALSO$
 *      CSETATMUPA(),SETATLIKE()
 *  $END$
 */

HB_FUNC(NUMAT)
{

  if ((ISCHAR (1)) && (ISCHAR (2)))
  {
    
    char *pcStringToMatch = (char *)hb_parc (1);
    size_t sStrToMatchLen = (size_t)hb_parclen (1);
    char *pcString        = (char *)hb_parc (2);
    size_t sStrLen        = (size_t)hb_parclen (2);
    int iMultiPass        = ct_getatmupa();
    int iAtLike           = ct_getatlike();
    char cAtLike          = ct_getatlikechar();
    size_t sIgnore, sMatchStrLen, sSubStrLen;
    ULONG ulCounter;
    char *pc, *pcSubStr;

    /* eventually ignore some characters */
    if (ISNUM (3))
      sIgnore = (size_t)hb_parnl (3);
    else
      sIgnore = 0;

    if (sIgnore >= sStrLen)
    {
      int iArgErrorMode = ct_getargerrormode();
      if (iArgErrorMode != CT_ARGERR_IGNORE)
      {
        ct_error ((USHORT)iArgErrorMode, EG_ARG, CT_ERROR_NUMAT,
                  NULL, "NUMAT", 0, EF_CANDEFAULT, 3,
                  hb_paramError (1), hb_paramError (2),
                  hb_paramError (3));
      }
      hb_retnl (0);
      return;
    }
    else
    {
      pcString += sIgnore;
      sStrLen -= sIgnore;
    }

    ulCounter = 0;
    pcSubStr = pcString;
    sSubStrLen = sStrLen;

    do
    {

      switch (iAtLike)
      {
        case CT_SETATLIKE_EXACT:
        {
          pc = ct_at_exact_forward (pcSubStr, sSubStrLen,
                                    pcStringToMatch, sStrToMatchLen,
                                    &sMatchStrLen);
        }; break;

        case CT_SETATLIKE_WILDCARD:
        {
          pc = ct_at_wildcard_forward (pcSubStr, sSubStrLen,
                                       pcStringToMatch, sStrToMatchLen,
                                       cAtLike, &sMatchStrLen);
        }; break;

        default:
        {
          pc = NULL;
        };
      }

      ulCounter++;

      if (iMultiPass)
        pcSubStr = pc+1;
      else
        pcSubStr = pc+sMatchStrLen;
      sSubStrLen = sStrLen-(pcSubStr-pcString);
    
    } while (pc != NULL);

    hb_retnl (ulCounter-1);

  }
  else /* ((ISCHAR (1)) && (ISCHAR (2))) */
  {
    PHB_ITEM pSubst = NULL;
    int iArgErrorMode = ct_getargerrormode();
    if (iArgErrorMode != CT_ARGERR_IGNORE)
    {
      pSubst = ct_error_subst ((USHORT)iArgErrorMode, EG_ARG, CT_ERROR_NUMAT,
                               NULL, "NUMAT", 0, EF_CANSUBSTITUTE, 3,
                               hb_paramError (1), hb_paramError (2),
                               hb_paramError (3));
    }
    
    if (pSubst != NULL)
    {
      hb_itemReturn (pSubst);
      hb_itemRelease (pSubst);
    }
    else
    {
      hb_retnl (0);
    }
    return;
  }

  return;

}