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/* ucl_ptr.h -- low-level pointer constructs

   This file is part of the UCL data compression library.

   Copyright (C) 1996-2002 Markus Franz Xaver Johannes Oberhumer
   All Rights Reserved.

   The UCL library 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 of
   the License, or (at your option) any later version.

   The UCL library 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 the UCL library; see the file COPYING.
   If not, write to the Free Software Foundation, Inc.,
   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

   Markus F.X.J. Oberhumer
   <markus@oberhumer.com>
 */


/* WARNING: this file should *not* be used by applications. It is
   part of the implementation of the library and is subject
   to change.
 */


#ifndef __UCL_PTR_H
#define __UCL_PTR_H

#ifdef __cplusplus
extern "C" {
#endif


/* This is the lowest part of the UCL library.
 * It deals with pointer representations at bit level.
 */


/***********************************************************************
// Includes
************************************************************************/

#if defined(__UCL_DOS16) || defined(__UCL_WIN16)
#  include <dos.h>
#  if 1 && defined(__WATCOMC__)
#    include <i86.h>
     __UCL_EXTERN_C unsigned char _HShift;
#    define __UCL_HShift    _HShift
#  elif 1 && defined(_MSC_VER)
     __UCL_EXTERN_C unsigned short __near _AHSHIFT;
#    define __UCL_HShift    ((unsigned) &_AHSHIFT)
#  elif defined(__UCL_WIN16)
#    define __UCL_HShift    3
#  else
#    define __UCL_HShift    12
#  endif
#  if !defined(_FP_SEG) && defined(FP_SEG)
#    define _FP_SEG         FP_SEG
#  endif
#  if !defined(_FP_OFF) && defined(FP_OFF)
#    define _FP_OFF         FP_OFF
#  endif
#endif


/***********************************************************************
// Integral types
************************************************************************/

/* ptrdiff_t */
#if !defined(ucl_ptrdiff_t)
  #if (UINT_MAX >= UCL_0xffffffffL)
     typedef ptrdiff_t          ucl_ptrdiff_t;
  #else
     typedef long               ucl_ptrdiff_t;
  #endif
#endif


/* Unsigned type that has *exactly* the same number of bits as a ucl_voidp */
#if !defined(__UCL_HAVE_PTR_T)
#  if defined(ucl_ptr_t)
#    define __UCL_HAVE_PTR_T
#  endif
#endif
#if !defined(__UCL_HAVE_PTR_T)
#  if defined(SIZEOF_CHAR_P) && defined(SIZEOF_UNSIGNED_LONG)
#    if (SIZEOF_CHAR_P == SIZEOF_UNSIGNED_LONG)
       typedef unsigned long    ucl_ptr_t;
       typedef long             ucl_sptr_t;
#      define __UCL_HAVE_PTR_T
#    endif
#  endif
#endif
#if !defined(__UCL_HAVE_PTR_T)
#  if defined(SIZEOF_CHAR_P) && defined(SIZEOF_UNSIGNED)
#    if (SIZEOF_CHAR_P == SIZEOF_UNSIGNED)
       typedef unsigned int     ucl_ptr_t;
       typedef int              ucl_sptr_t;
#      define __UCL_HAVE_PTR_T
#    endif
#  endif
#endif