/*
 * $Id: at.c 11330 2009-06-13 22:44:34Z vszakats $
 */

/*
 * Harbour Project source code:
 * AT() function
 *
 * Copyright 1999 Antonio Linares <alinares@fivetech.com>
 * 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 "hbapi.h"
#include "hbapiitm.h"
#include "hbapierr.h"

/* locates a substring in a string */

HB_FUNC( HB_AT )
{
   PHB_ITEM pSub = hb_param( 1, HB_IT_STRING );
   PHB_ITEM pText = hb_param( 2, HB_IT_STRING );

   if( pText && pSub )
   {
      ULONG ulTextLength = hb_itemGetCLen( pText );
      ULONG ulStart = HB_ISNUM( 3 ) ? hb_parnl( 3 ) : 1;
      ULONG ulEnd = HB_ISNUM( 4 ) ? ( ULONG ) hb_parnl( 4 ) : ulTextLength;
      ULONG ulPos;

      if( ulStart > ulTextLength || ulEnd < ulStart )
         hb_retnl( 0 );
      else
      {
         if( ulEnd > ulTextLength )
            ulEnd = ulTextLength;

         ulPos = hb_strAt( hb_itemGetCPtr( pSub ), hb_itemGetCLen( pSub ),
                           hb_itemGetCPtr( pText ) + ulStart - 1, ulEnd - ulStart + 1 );

         if( ulPos > 0 )
            ulPos += ( ulStart - 1 );

         hb_retnl( ulPos );
      }
   }
   else
      hb_errRT_BASE_SubstR( EG_ARG, 1108, NULL, HB_ERR_FUNCNAME, HB_ERR_ARGS_BASEPARAMS );
}

HB_FUNC( AT )
{
   PHB_ITEM pSub = hb_param( 1, HB_IT_STRING );
   PHB_ITEM pText = hb_param( 2, HB_IT_STRING );

   if( pText && pSub )
   {
      hb_retnl( hb_strAt( hb_itemGetCPtr( pSub ), hb_itemGetCLen( pSub ),
                          hb_itemGetCPtr( pText ), hb_itemGetCLen( pText ) ) );
   }
   else
      hb_errRT_BASE_SubstR( EG_ARG, 1108, NULL, HB_ERR_FUNCNAME, HB_ERR_ARGS_BASEPARAMS );
}
