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-.\" Copyright (c) 1993
-.\" The Regents of the University of California. All rights reserved.
-.\"
-.\" This code is derived from software contributed to Berkeley by
-.\" Donn Seeley at BSDI.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\" notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\" notice, this list of conditions and the following disclaimer in the
-.\" documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\" must display the following acknowledgement:
-.\" This product includes software developed by the University of
-.\" California, Berkeley and its contributors.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\" may be used to endorse or promote products derived from this software
-.\" without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\" From: @(#)linkaddr.3 8.1 (Berkeley) 7/28/93
-.\" $Id$
-.\"
-.Dd June 17, 1996
-.Dt LINK_ADDR 3
-.Os BSD 4.4
-.Sh NAME
-.Nm link_addr ,
-.Nm link_ntoa
-.Nd elementary address specification routines for link level access
-.Sh SYNOPSIS
-.Fd #include <sys/types.h>
-.Fd #include <sys/socket.h>
-.Fd #include <net/if_dl.h>
-.Ft void
-.Fn link_addr "const char *addr" "struct sockaddr_dl *sdl"
-.Ft char *
-.Fn link_ntoa "const struct sockaddr_dl *sdl"
-.Sh DESCRIPTION
-The routine
-.Fn link_addr
-interprets character strings representing
-link-level addresses, returning binary information suitable
-for use in system calls.
-The routine
-.Fn link_ntoa
-takes
-a link-level
-address and returns an
-.Tn ASCII
-string representing some of the information present,
-including the link level address itself, and the interface name
-or number, if present.
-This facility is experimental and is
-still subject to change.
-.Pp
-For
-.Fn link_addr ,
-the string
-.Fa addr
-may contain
-an optional network interface identifier of the form
-.Dq "name unit-number" ,
-suitable for the first argument to
-.Xr ifconfig 8 ,
-followed in all cases by a colon and
-an interface address in the form of
-groups of hexadecimal digits
-separated by periods.
-Each group represents a byte of address;
-address bytes are filled left to right from
-low order bytes through high order bytes.
-.Pp
-.\" A regular expression may make this format clearer:
-.\" .Bd -literal -offset indent
-.\" ([a-z]+[0-9]+:)?[0-9a-f]+(\e.[0-9a-f]+)*
-.\" .Ed
-.\" .Pp
-Thus
-.Li le0:8.0.9.13.d.30
-represents an ethernet address
-to be transmitted on the first Lance ethernet interface.
-.Pp
-The direct use of these functions is deprecated in favor of the
-.Xr addr2ascii 3
-interface; however, portable programs cannot rely on the latter as it is
-not yet widely implemented.
-.Sh RETURN VALUES
-.Fn link_ntoa
-always returns a null terminated string.
-.Fn link_addr
-has no return value.
-(See
-.Sx BUGS . )
-.Sh SEE ALSO
-.Xr addr2ascii 3
-.\" .Xr iso 4
-.Sh HISTORY
-The
-.Fn link_addr
-and
-.Fn link_ntoa
-functions appeared in
-.Bx 4.3 Reno .
-.Sh BUGS
-The returned values for link_ntoa
-reside in a static memory area.
-.Pp
-The function
-.Fn link_addr
-should diagnose improperly formed input, and there should be an unambiguous
-way to recognize this.
-.Pp
-If the
-.Va sdl_len
-field of the link socket address
-.Fa sdl
-is 0,
-.Fn link_ntoa
-will not insert a colon before the interface address bytes.
-If this translated address is given to
-.Fn link_addr
-without inserting an initial colon,
-the latter will not interpret it correctly.