setbit(9) - NetBSD Manual Pages

Command: Section: Arch: Collection:  
SETBIT(9)              NetBSD 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
bitmap(3), 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. NetBSD 9.99 December 4, 2012 NetBSD 9.99
Powered by man-cgi (2020-09-24). Maintained for NetBSD by Kimmo Suominen. Based on man-cgi by Panagiotis Christias.