54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
/*
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* Copyright 2011 by Jason Gerecke, Wacom. <jason.gerecke@wacom.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* 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; 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 WACOM_UTIL_H_
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#define WACOM_UTIL_H_
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/**
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* Get the number of elements in an array
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*/
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#ifndef ARRAY_SIZE
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#define ARRAY_SIZE(a) (sizeof(a)/sizeof((a)[0]))
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#endif
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/* to access kernel defined bits */
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#define BIT(x) (1UL<<((x) & (BITS_PER_LONG - 1)))
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#define BITS_PER_LONG (sizeof(long) * 8)
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#define NBITS(x) ((((x)-1)/BITS_PER_LONG)+1)
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#define ISBITSET(x,y) ((x)[LONG(y)] & BIT(y))
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#define SETBIT(x,y) ((x)[LONG(y)] |= BIT(y))
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#define CLEARBIT(x,y) ((x)[LONG(y)] &= ~BIT(y))
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#define OFF(x) ((x)%BITS_PER_LONG)
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#define LONG(x) ((x)/BITS_PER_LONG)
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/**
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* Test if the mask is set in the given bitfield.
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* @return TRUE if set or FALSE otherwise.
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*/
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#define MaskIsSet(bitfield, mask) !!(((bitfield) & (mask)) == (mask))
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/**
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* Set the given mask for the given bitfield.
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*/
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#define MaskSet(bitfield, mask) ((bitfield) |= (mask))
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/**
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* Clear the given mask from the given bitfield
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*/
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#define MaskClear(bitfield, mask) ((bitfield) &= ~(mask))
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#endif /* WACOM_UTIL_H_ */
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