FFS(3) BSD Programmer's Manual FFS(3)
ffs - find first bit set in a bit string
#include <string.h> int ffs(int value);
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. MirOS BSD #10-current April 19, 1991 1
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