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

   This file is part of the UCL data compression library.

   Copyright (C) 1996-2004 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>

   http://www.oberhumer.com/opensource/ucl/

 */

/* 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

/***********************************************************************

// Integral types

************************************************************************/

#if !defined(ucl_uintptr_t)

#  define ucl_uintptr_t     acc_uintptr_t

#endif

/***********************************************************************

//

************************************************************************/

/* Always use the safe (=integral) version for pointer-comparisions.

 * The compiler should optimize away the additional casts anyway.

 *

 * Note that this only works if the representation and ordering

 * of the pointer and the integral is the same (at bit level).

 *

 * Most 16-bit compilers have their own view about pointers -

 * fortunately they don't care about comparing pointers

 * that are pointing to Nirvana.

 */

#if (ACC_OS_DOS16 || ACC_OS_OS216 || ACC_OS_WIN16)

#define PTR(a)              ((ucl_bytep) (a))

/* only need the low bits of the pointer -> offset is ok */

#define PTR_ALIGNED_4(a)    ((ACC_FP_OFF(a) & 3) == 0)

#define PTR_ALIGNED2_4(a,b) (((ACC_FP_OFF(a) | ACC_FP_OFF(b)) & 3) == 0)

#else

#define PTR(a)              ((ucl_uintptr_t) (a))

#define PTR_LINEAR(a)       PTR(a)

#define PTR_ALIGNED_4(a)    ((PTR_LINEAR(a) & 3) == 0)

#define PTR_ALIGNED_8(a)    ((PTR_LINEAR(a) & 7) == 0)

#define PTR_ALIGNED2_4(a,b) (((PTR_LINEAR(a) | PTR_LINEAR(b)) & 3) == 0)

#define PTR_ALIGNED2_8(a,b) (((PTR_LINEAR(a) | PTR_LINEAR(b)) & 7) == 0)

#endif

#define PTR_LT(a,b)         (PTR(a) < PTR(b))

#define PTR_GE(a,b)         (PTR(a) >= PTR(b))

UCL_EXTERN(ucl_uintptr_t)

__ucl_ptr_linear(const ucl_voidp ptr);

typedef union

{

    char            a_char;

    unsigned char   a_uchar;

    short           a_short;

    unsigned short  a_ushort;

    int             a_int;

    unsigned int    a_uint;

    long            a_long;

    unsigned long   a_ulong;

    ucl_int         a_ucl_int;

    ucl_uint        a_ucl_uint;

    ucl_int32       a_ucl_int32;

    ucl_uint32      a_ucl_uint32;

    ptrdiff_t       a_ptrdiff_t;

    ucl_uintptr_t   a_ucl_uintptr_t;

    ucl_voidp       a_ucl_voidp;

    void *          a_void_p;

    ucl_bytep       a_ucl_bytep;

    ucl_bytepp      a_ucl_bytepp;

    ucl_uintp       a_ucl_uintp;

    ucl_uint *      a_ucl_uint_p;

    ucl_uint32p     a_ucl_uint32p;

    ucl_uint32 *    a_ucl_uint32_p;

    unsigned char * a_uchar_p;

    char *          a_char_p;

}

ucl_align_t;

#ifdef __cplusplus

} /* extern "C" */

#endif

#endif /* already included */

/*

vi:ts=4:et

*/