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The C and C++ Include Header Files

/usr/include/xorg/wacom-util.h

$ cat -n /usr/include/xorg/wacom-util.h

     1	/*
     2	 * Copyright 2011 by Jason Gerecke, Wacom. <jason.gerecke@wacom.com>
     3	 *
     4	 * This program is free software; you can redistribute it and/or
     5	 * modify it under the terms of the GNU General Public License
     6	 * as published by the Free Software Foundation; either version 2
     7	 * of the License, or (at your option) any later version.
     8	 *
     9	 * This program is distributed in the hope that it will be useful,
    10	 * but WITHOUT ANY WARRANTY; without even the implied warranty of
    11	 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    12	 * GNU General Public License for more details.
    13	 *
    14	 * You should have received a copy of the GNU General Public License
    15	 * along with this program; if not, write to the Free Software
    16	 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
    17	 */
    18	
    19	#ifndef WACOM_UTIL_H_
    20	#define WACOM_UTIL_H_
    21	
    22	/**
    23	 * Get the number of elements in an array
    24	 */
    25	#ifndef ARRAY_SIZE
    26	#define ARRAY_SIZE(a) (sizeof(a)/sizeof((a)[0]))
    27	#endif
    28	
    29	/* to access kernel defined bits */
    30	#define BIT(x)		(1UL<<((x) & (BITS_PER_LONG - 1)))
    31	#define BITS_PER_LONG	(sizeof(long) * 8)
    32	#define NBITS(x)	((((x)-1)/BITS_PER_LONG)+1)
    33	#define ISBITSET(x,y)	((x)[LONG(y)] & BIT(y))
    34	#define SETBIT(x,y)	((x)[LONG(y)] |= BIT(y))
    35	#define CLEARBIT(x,y)	((x)[LONG(y)] &= ~BIT(y))
    36	#define OFF(x)		((x)%BITS_PER_LONG)
    37	#define LONG(x)		((x)/BITS_PER_LONG)
    38	
    39	/**
    40	 * Test if the mask is set in the given bitfield.
    41	 * @return TRUE if set or FALSE otherwise.
    42	 */
    43	#define MaskIsSet(bitfield, mask) !!(((bitfield) & (mask)) == (mask))
    44	/**
    45	 * Set the given mask for the given bitfield.
    46	 */
    47	#define MaskSet(bitfield, mask) ((bitfield) |= (mask))
    48	/**
    49	 * Clear the given mask from the given bitfield
    50	 */
    51	#define MaskClear(bitfield, mask) ((bitfield) &= ~(mask))
    52	
    53	#endif /* WACOM_UTIL_H_ */
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