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/* @(#)btorder.h 1.16 03/06/15 Copyright 1996 J. Schilling */
/*
* Definitions for Bit and Byte ordering
*
* Copyright (c) 1996 J. Schilling
*/
/*
* 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 program; see the file COPYING. If not, write to the Free Software
* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef _BTORDER_H
#define _BTORDER_H
#ifndef _INCL_SYS_TYPES_H
#include <sys/types.h> /* try to load isa_defs.h on Solaris */
#define _INCL_SYS_TYPES_H
#endif
#ifndef _MCONFIG_H
#include <mconfig.h> /* load bit/byte-oder from xmconfig.h*/
#endif
/*
* Convert bit-order definitions from xconfig.h into our values
* and verify them.
*/
#if defined(HAVE_C_BITFIELDS) && \
defined(BITFIELDS_LTOH)
#define _BIT_FIELDS_LTOH
#endif
#if defined(HAVE_C_BITFIELDS) && \
defined(BITFIELDS_HTOL)
#define _BIT_FIELDS_HTOL
#endif
#if defined(HAVE_C_BITFIELDS) && \
!defined(BITFIELDS_HTOL)
#define BITFIELDS_LTOH
#define _BIT_FIELDS_LTOH
#endif
#if defined(_BIT_FIELDS_LTOH) && defined(_BIT_FIELDS_HTOL)
/*
* #error will not work for all compilers (e.g. sunos4)
* The following line will abort compilation on all compilers
* if none of the above is defines. And that's what we want.
*/
error Only one of _BIT_FIELDS_LTOH or _BIT_FIELDS_HTOL may be defined
#endif
/*
* Convert byte-order definitions from xconfig.h into our values
* and verify them.
* Note that we cannot use the definitions _LITTLE_ENDIAN and _BIG_ENDIAN
* because they are used on IRIX-6.5 with different meaning.
*/
#if defined(HAVE_C_BIGENDIAN) && \
!defined(WORDS_BIGENDIAN)
#define WORDS_LITTLEENDIAN
/*#define _LITTLE_ENDIAN*/
#endif
#if defined(HAVE_C_BIGENDIAN) && \
defined(WORDS_BIGENDIAN)
#undef WORDS_LITTLEENDIAN
/*#define _BIG_ENDIAN*/
#endif
#if defined(_BIT_FIELDS_LTOH) || defined(_BIT_FIELDS_HTOL)
/*
* Bitorder is already known.
*/
#else
/*
* Bitorder not yet known.
*/
# if defined(sun3) || defined(mc68000) || \
defined(sun4) || defined(__sparc) || defined(sparc) || \
defined(__hppa) || defined(_ARCH_PPC) || defined(_IBMR2)
# define _BIT_FIELDS_HTOL
# endif
# if defined(__sgi) && defined(__mips)
# define _BIT_FIELDS_HTOL
# endif
# if defined(__i386__) || defined(__i386) || defined(i386) || \
defined(__ia64__) || defined(__ia64) || defined(ia64) || \
defined(__alpha__) || defined(__alpha) || defined(alpha) || \
defined(__arm__) || defined(__arm) || defined(arm)
# define _BIT_FIELDS_LTOH
# endif
# if defined(__ppc__) || defined(ppc) || defined(__ppc) || \
defined(__PPC) || defined(powerpc) || defined(__powerpc__)
# if defined(__BIG_ENDIAN__)
# define _BIT_FIELDS_HTOL
# else
# define _BIT_FIELDS_LTOH
# endif
# endif
#endif
#endif /* _BTORDER_H */
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