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.Dd February 7, 2012
.Dt KETHER_NTOA 9
.Os
.Sh NAME
.Nm kether_ntoa ,
.Nm kether_aton
.Nd ethernet address conversion routines
.Sh SYNOPSIS
.In net/if_var.h
.Ft char *
.Fn kether_ntoa "const u_char *addr" "char *buf"
.Ft u_char *
.Fn kether_aton "const char *macstr" "u_char *addr"
.Sh DESCRIPTION
The
.Fn kether_ntoa
function converts the ethernet address specified in
.Fa addr
to its corresponding hexadecimal ASCII representation.
Likewise, the
.Fn kether_aton
function converts an ASCII
string specified in
.Fa macstr
to an ethernet address.
.Pp
.Fn kether_ntoa
serves a similar purpose as the former, non-standard
.Cm D
conversion of
.Xr kprintf 9
(as in,
.Dq %6D )
which some
.Bx Ns s
still have.
.Pp
Notational conventions for hexadecimal ASCII
representation of a MAC
address are specified in IEEE 802.
.Sh RETURN VALUES
The
.Fn kether_ntoa
function returns a pointer to the string containing the hexadecimal ASCII
representation of the ethernet address passed in
.Fa addr ,
or NULL in the case of failure.
.Pp
The
.Fn kether_aton
function returns a pointer to a block of bytes containing the conversion
of the specified ASCII
string in
.Fa macstr ,
or NULL in the case of failure.
.Sh SEE ALSO
.Xr ascii 7 ,
.Xr hexdump 9 ,
.Xr hexncpy 9
.Sh HISTORY
The
.Fn kether_ntoa
and
.Fn kether_aton
functions first appeared in
.Dx 3.3 .