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+.TH LIBJ2_J2U_LROT 3 LIBJ2
+.SH NAME
+libj2_j2u_lrot \- Left-rotate bits
+
+.SH SYNOPSIS
+.nf
+#include <libj2.h>
+
+void \fBlibj2_j2u_lrot\fP(struct libj2_j2u *\fIa\fP, unsigned \fIb\fP);
+void \fBlibj2_j2u_lrot_to_j2u\fP(const struct libj2_j2u *\fIa\fP, unsigned \fIb\fP, struct libj2_j2u *\fIr\fP);
+void \fBlibj2_ju_lrot_to_j2u\fP(uintmax_t \fIa\fP, unsigned \fIb\fP, struct libj2_j2u *\fIr\fP);
+.fi
+.PP
+Link with
+.IR -lj2 .
+
+.SH DESCRIPTION
+The
+.BR libj2_j2u_lrot ()
+function shifts each bit in
+.I a
+to
+.I b
+more significant positions; the
+.I b
+most significant bits are moved
+to the
+.I b
+least significant positions with
+preserved significance relative to
+each other. The result is written
+back to
+.IR a .
+.PP
+The
+.BR libj2_j2u_lrot_to_j2u ()
+function modifies
+.I a
+likewise, but writes the result to
+.I r
+rather than
+.IR a .
+.PP
+The
+.BR libj2_ju_lrot_to_j2u ()
+function is equivalent to the
+.BR libj2_j2u_lrot_to_j2u ()
+function, except
+.I a
+is converted to a
+.B struct libj2_j2u *
+before the modification takes place.
+.PP
+The arguments are assumed to be
+.RI non- NULL .
+
+.SH RETURN VALUE
+None.
+
+.SH ERRORS
+The above listed functions cannot fail.
+
+.SH HISTORY
+The
+.BR libj2_j2u_lrot (),
+.BR libj2_j2u_lrot_to_j2u (),
+and
+.BR libj2_ju_lrot_to_j2u ()
+functions were added in version 1.0 of
+.BR libj2 .
+
+.SH SEE ALSO
+.BR libj2 (7),
+.BR libj2_j2u_rrot (3),
+.BR libj2_j2i_lsh (3),
+.BR libj2_j2i_rsh (3)