ffs - find first set bit
The ffs() function shall find the first bit set (beginning with the least significant bit) in i, and return the index of that bit. Bits are numbered starting at one (the least significant bit).
The ffs() function shall return the index of the first bit set. If i is 0, then ffs() shall return 0.
No errors are defined.
First released in Issue 4, Version 2.
Moved from X/OPEN UNIX extension to BASE.
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