/*
 * $Id: reserved.c 9434 2008-09-18 05:23:49Z druzus $
 */

/*
 * Harbour Project source code:
 * Compiler Expression Optimizer
 *
 * Copyright 1999 Ryszard Glab
 * 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"

/* Table with reserved functions names
 * NOTE: THIS TABLE MUST BE SORTED ALPHABETICALLY
 */
#if !defined( HB_RESERVED_OFF )
static const char * s_szReservedFun[] = {
   "AADD"      ,
   "ABS"       ,
   "ASC"       ,
   "AT"        ,
   "BOF"       ,
   "BREAK"     ,
   "CDOW"      ,
   "CHR"       ,
   "CMONTH"    ,
   "COL"       ,
   "CTOD"      ,
   "DATE"      ,
   "DAY"       ,
   "DELETED"   ,
   "DEVPOS"    ,
   "DOW"       ,
   "DTOC"      ,
   "DTOS"      ,
   "EMPTY"     ,
   "EOF"       ,
   "EXP"       ,
   "FCOUNT"    ,
   "FIELDNAME" ,
   "FLOCK"     ,
   "FOUND"     ,
   "INKEY"     ,
   "INT"       ,
   "LASTREC"   ,
   "LEFT"      ,
   "LEN"       ,
   "LOCK"      ,
   "LOG"       ,
   "LOWER"     ,
   "LTRIM"     ,
   "MAX"       ,
   "MIN"       ,
   "MONTH"     ,
   "PCOL"      ,
   "PCOUNT"    ,
   "PROW"      ,
   "QSELF"     ,
   "RECCOUNT"  ,
   "RECNO"     ,
   "REPLICATE" ,
   "RLOCK"     ,
   "ROUND"     ,
   "ROW"       ,
   "RTRIM"     ,
   "SECONDS"   ,
   "SELECT"    ,
   "SETPOS"    ,
   "SETPOSBS"  ,
   "SPACE"     ,
   "SQRT"      ,
   "STR"       ,
   "SUBSTR"    ,
   "TIME"      ,
   "TRANSFORM" ,
   "TRIM"      ,
   "TYPE"      ,
   "UPPER"     ,
   "VAL"       ,
   "VALTYPE"   ,
   "WORD"      ,
   "YEAR"
};

#define RESERVED_FUNCTIONS    ( sizeof( s_szReservedFun ) / sizeof( char * ) )
#endif

const char * hb_compReservedName( const char * szName )
{
#if !defined( HB_RESERVED_OFF )
   unsigned int uiFirst = 0, uiLast = RESERVED_FUNCTIONS - 1, uiMiddle;
   int iLen = ( int ) strlen( szName ), iCmp;

   /* Respect 4 or more letters shortcuts
    * SECO() is not allowed because of Clipper function SECONDS()
    * however SECO32() is a valid name.
    */
   if( iLen < 4 )
      iLen = 4;
   do
   {
      uiMiddle = ( uiFirst + uiLast ) >> 1;
      iCmp = strncmp( szName, s_szReservedFun[ uiMiddle ], iLen );
      if( iCmp <= 0 )
         uiLast = uiMiddle;
      else
         uiFirst = uiMiddle + 1;
   }
   while( uiFirst < uiLast );

   if( uiFirst != uiMiddle )
      iCmp = strncmp( szName, s_szReservedFun[ uiFirst ], iLen );

   if( iCmp == 0 )
      return ( char * ) s_szReservedFun[ uiFirst ];
#else
   HB_SYMBOL_UNUSED( szName );
#endif

   return NULL;
}
