.TH LIBJ2_FFS_J2U 3 LIBJ2
.SH NAME
libj2_ffs_j2u \- Find first set bit

.SH SYNOPSIS
.nf
#include <libj2.h>

unsigned \fBlibj2_ffs_j2u\fP(const struct libj2_j2u *\fIa\fP);
.fi
.PP
Link with
.IR -lj2 .

.SH DESCRIPTION
The
.BR libj2_ffs_j2u ()
function returns the index of the least
significant set bit in
.IR a ,
where the index is counted from 1,
and from the the least significant bit.
.PP
In the case that no bit in
.I a
is set, 0 is returned.
.PP
.I a
is assumed to be
.RI non- NULL .

.SH RETURN VALUE
The
.BR libj2_ffs_j2u ()
function returns the one-based index of
the first set bit in
.IR a ,
or 0 if no bit is set.

.SH ERRORS
The
.BR libj2_ffs_j2u ()
function cannot fail.

.SH SEE ALSO
.BR libj2 (7),
.BR libj2_ffc_j2u (3),
.BR libj2_fls_j2u (3),
.BR libj2_ctz_j2u (3),
.BR libj2_kfs_j2u (3),
.BR libj2_cfs_j2u (3),
.BR libj2_sfc_j2u (3)