JezK

Edit File: wacom-util.h

/* * Copyright 2011 by Jason Gerecke, Wacom. <jason.gerecke@wacom.com> * * 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 * of the License, 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; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifndef WACOM_UTIL_H_ #define WACOM_UTIL_H_ /** * Get the number of elements in an array */ #ifndef ARRAY_SIZE #define ARRAY_SIZE(a) (sizeof(a)/sizeof((a)[0])) #endif /* to access kernel defined bits */ #define BIT(x) (1UL<<((x) & (BITS_PER_LONG - 1))) #define BITS_PER_LONG (sizeof(long) * 8) #define NBITS(x) ((((x)-1)/BITS_PER_LONG)+1) #define ISBITSET(x,y) ((x)[LONG(y)] & BIT(y)) #define SETBIT(x,y) ((x)[LONG(y)] |= BIT(y)) #define CLEARBIT(x,y) ((x)[LONG(y)] &= ~BIT(y)) #define OFF(x) ((x)%BITS_PER_LONG) #define LONG(x) ((x)/BITS_PER_LONG) /** * Test if the mask is set in the given bitfield. * @return TRUE if set or FALSE otherwise. */ #define MaskIsSet(bitfield, mask) !!(((bitfield) & (mask)) == (mask)) /** * Set the given mask for the given bitfield. */ #define MaskSet(bitfield, mask) ((bitfield) |= (mask)) /** * Clear the given mask from the given bitfield */ #define MaskClear(bitfield, mask) ((bitfield) &= ~(mask)) #endif /* WACOM_UTIL_H_ */