SETBIT(9)
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.
March 1, 2010
NetBSD 5.99