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FFS(3) Library Functions Manual FFS(3) NAME ffs - find first bit set in a bit string LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <strings.h> int ffs(int value); DESCRIPTION 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 right- most bit. A return value of 0 means that the argument was zero. SEE ALSO bitstring(3), ffs32(3), popcount(3) STANDARDS The ffs() function conforms to IEEE Std 1003.1-2001 ("POSIX.1"). HISTORY The ffs() function appeared in 4.3BSD. The prototype for it existed previously in the <string.h> header before it was moved to <strings.h> for POSIX compliance. NetBSD 8.0 April 28, 2010 NetBSD 8.0