|FFS(3)||Library Functions Manual||FFS(3)|
ffs() function finds the first bit set in value and returns the index of that bit. Bits are numbered starting from 1, starting at the rightmost bit. A return value of 0 means that the argument was zero.
ffs() function conforms to IEEE Std 1003.1-2008 (“POSIX.1”).
ffs() function first appeared in 4.2BSD.
|November 24, 2015||OpenBSD-current|