ffs -- find first bit set in a bit string
Standard C Library (libc, -lc)
The 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.
The ffs() function appeared in 4.3BSD. Its prototype existed previously
in <string.h> before it was moved to <strings.h> for IEEE Std 1003.1-2001
FreeBSD 5.2.1 April 19, 1994 FreeBSD 5.2.1 [ Back ]