support.h revision 7e7bd3dccbfe8f79e25e5c1554b5bc3a9aaca321
/*
* support.h - Various useful things. Part of the Linux-NTFS project.
*
* Copyright (c) 2000-2004 Anton Altaparmakov
* Copyright (c) 2006 Szabolcs Szakacsits
* Copyright (c) 2006 Yura Pakhuchiy
*
* This program/include file 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.
*
* This program/include file 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 (in the main directory of the Linux-NTFS
* distribution in the file COPYING); if not, write to the Free Software
* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _NTFS_SUPPORT_H
#define _NTFS_SUPPORT_H
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_STDDEF_H
#include <stddef.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include "logging.h"
/*
* Our mailing list. Use this define to prevent typos in email address.
*/
#define NTFS_DEV_LIST "linux-ntfs-dev@lists.sf.net"
/*
* Generic macro to convert pointers to values for comparison purposes.
*/
#ifndef p2n
#define p2n(p) ((ptrdiff_t)((ptrdiff_t*)(p)))
#endif
/*
* The classic min and max macros.
*/
#ifndef min
#define min(a,b) ((a) <= (b) ? (a) : (b))
#endif
#ifndef max
#define max(a,b) ((a) >= (b) ? (a) : (b))
#endif
/*
* Useful macro for determining the offset of a struct member.
*/
#ifndef offsetof
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
#endif
/*
* Round up and down @num to 2 in power of @order.
*/
#define ROUND_UP(num,order) (((num) + ((1 << (order)) - 1)) & \
~((1 << (order)) - 1))
#define ROUND_DOWN(num,order) ((num) & ~((1 << (order)) - 1))
/*
* Simple bit operation macros. NOTE: These are NOT atomic.
*/
#define test_bit(bit, var) ((var) & (1 << (bit)))
#define set_bit(bit, var) (var) |= 1 << (bit)
#define clear_bit(bit, var) (var) &= ~(1 << (bit))
#ifdef __sun
#define test_and_set_bit(bit, var) _test_and_set_bit(bit, &var)
static __inline__ BOOL _test_and_set_bit(unsigned long bit, unsigned long *var)
{
const BOOL old_state = test_bit(bit, *var);
set_bit(bit, *var);
return old_state;
}
#define test_and_clear_bit(bit, var) _test_and_clear_bit(bit, &var)
static __inline__ BOOL _test_and_clear_bit(unsigned long bit, unsigned long *var)
{
const BOOL old_state = test_bit(bit, *var);
clear_bit(bit, *var);
return old_state;
}
#else /* !__sun */
#define test_and_set_bit(bit, var) \
({ \
const BOOL old_state = test_bit(bit, var); \
set_bit(bit, var); \
old_state; \
})
#define test_and_clear_bit(bit, var) \
({ \
const BOOL old_state = test_bit(bit, var); \
clear_bit(bit, var); \
old_state; \
})
#endif /* __sun */
/* Memory allocation with logging. */
extern void *ntfs_calloc(size_t size);
extern void *ntfs_malloc(size_t size);
#endif /* defined _NTFS_SUPPORT_H */