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SETBIT(9)		 BSD Kernel Developer's Manual		     SETBIT(9)

NAME
     setbit — macros related to bitmaps

SYNOPSIS
     #include <sys/param.h>

     void
     setbit(array, x);

     void
     clrbit(array, x);

     int
     isset(array, x);

     int
     isclr(array, x);

DESCRIPTION
     The setbit family of macros operate with bitmaps, also known as bit
     arrays.

     In a nutshell, setbit() sets the bit x in array, clrbit() clears it,
     isset() tests whether x is set, and isclr() returns 1 if x is not set.

EXAMPLES
     The following example declares a buffer of 10 chars, treating it as an
     array of 80 bits:

	   char buf[10];

	   ...

	   setbit(buf, 12);	   /* set the fifth bit in the second byte */

SEE ALSO
     bitstring(3)

CAVEATS
     The number of valid bits in a given array is assumed to be multiple of
     CHAR_BIT, the number of bits for smallest object that is not a bit-field.

BSD				 March 1, 2010				   BSD

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