ffs man page on Minix

ffs man page on Minix

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FFS(3)			 BSD 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 pre‐
     viously in the <string.h> header before it was moved to <strings.h> for
     POSIX compliance.

BSD				April 28, 2010				   BSD

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