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86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
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/*
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* support.h - Useful definitions and macros. Originated from the Linux-NTFS project.
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*
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* Copyright (c) 2000-2004 Anton Altaparmakov
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*
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* This program/include file is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program/include file is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (in the main directory of the NTFS-3G
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* distribution in the file COPYING); if not, write to the Free Software
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* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _NTFS_SUPPORT_H
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#define _NTFS_SUPPORT_H
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef HAVE_STDDEF_H
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#include <stddef.h>
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#endif
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/*
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* Our mailing list. Use this define to prevent typos in email address.
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*/
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#define NTFS_DEV_LIST "ntfs-3g-devel@lists.sf.net"
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/*
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* Generic macro to convert pointers to values for comparison purposes.
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*/
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#ifndef p2n
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#define p2n(p) ((ptrdiff_t)((ptrdiff_t*)(p)))
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#endif
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/*
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* The classic min and max macros.
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*/
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#ifndef min
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#define min(a,b) ((a) <= (b) ? (a) : (b))
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#endif
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#ifndef max
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#define max(a,b) ((a) >= (b) ? (a) : (b))
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#endif
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/*
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* Useful macro for determining the offset of a struct member.
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*/
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#ifndef offsetof
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#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
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#endif
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/*
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* Simple bit operation macros. NOTE: These are NOT atomic.
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*/
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#define test_bit(bit, var) ((var) & (1 << (bit)))
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#define set_bit(bit, var) (var) |= 1 << (bit)
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#define clear_bit(bit, var) (var) &= ~(1 << (bit))
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#define test_and_set_bit(bit, var) \
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({ \
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const BOOL old_state = test_bit(bit, var); \
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set_bit(bit, var); \
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old_state; \
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})
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#define test_and_clear_bit(bit, var) \
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({ \
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const BOOL old_state = test_bit(bit, var); \
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clear_bit(bit, var); \
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old_state; \
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})
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#endif /* defined _NTFS_SUPPORT_H */
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