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/* Definitions of macros to access `dev_t' values.
Copyright (C) 1996, 1997, 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef _SYS_SYSMACROS_H
#define _SYS_SYSMACROS_H 1
/* For compatibility we provide alternative names.
The problem here is that compilers other than GCC probably don't
have the `long long' type and so `dev_t' is actually an array. */
#if defined __GNUC__ && __GNUC__ >= 2
# define major(dev) ((int)(((dev) >> 8) & 0xff))
# define minor(dev) ((int)((dev) & 0xff))
# define makedev(major, minor) ((((unsigned int) (major)) << 8) \
| ((unsigned int) (minor)))
#else
/* We need to know the word order here. This assumes that the word order
is consistent with the byte order. */
# include <endian.h>
# if __BYTE_ORDER == __BIG_ENDIAN
# define major(dev) (((dev).__val[1] >> 8) & 0xff)
# define minor(dev) ((dev).__val[1] & 0xff)
# define makedev(major, minor) { 0, ((((unsigned int) (major)) << 8) \
| ((unsigned int) (minor))) }
# else
# define major(dev) (((dev).__val[0] >> 8) & 0xff)
# define minor(dev) ((dev).__val[0] & 0xff)
# define makedev(major, minor) { ((((unsigned int) (major)) << 8) \
| ((unsigned int) (minor))), 0 }
# endif
#endif
#endif /* sys/sysmacros.h */
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