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.
BSD April 19, 1994 BSD
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