setbit(9) - NetBSD Manual Pages

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

setbit -- macros related to bitmaps
#include <sys/param.h> void setbit(array, x); void clrbit(array, x); int isset(array, x); int isclr(array, x);
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.
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 */
bitmap(3), bitstring(3)
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
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