#include <strings.h>
The ffs() function finds the first bit set (beginning with the least significant bit) and returns the index of that bit. Bits are numbered starting at one (the least significant bit).
The ffs() function returns the index of the first bit set. If i is 0, then ffs() returns 0.
No errors are defined.
See attributes(5) for descriptions of the following attributes:
attributes(5)
