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1.\" $NetBSD: iso_addr.3,v 1.2 1995/02/25 06:20:46 cgd Exp $
2.\"
3.\" Copyright (c) 1993
4.\" The Regents of the University of California. All rights reserved.
5.\"
6.\" Redistribution and use in source and binary forms, with or without
7.\" modification, are permitted provided that the following conditions
8.\" are met:
9.\" 1. Redistributions of source code must retain the above copyright
10.\" notice, this list of conditions and the following disclaimer.
11.\" 2. Redistributions in binary form must reproduce the above copyright
12.\" notice, this list of conditions and the following disclaimer in the
13.\" documentation and/or other materials provided with the distribution.
14.\" 3. All advertising materials mentioning features or use of this software
15.\" must display the following acknowledgement:
16.\" This product includes software developed by the University of
17.\" California, Berkeley and its contributors.
18.\" 4. Neither the name of the University nor the names of its contributors
19.\" may be used to endorse or promote products derived from this software
20.\" without specific prior written permission.
21.\"
22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32.\" SUCH DAMAGE.
33.\"
34.\" @(#)iso_addr.3 8.1 (Berkeley) 6/4/93
35.\"
36.Dd June 4, 1993
37.Dt ISO_ADDR 3
38.Os
39.Sh NAME
40.Nm iso_addr ,
41.Nm iso_ntoa
42.Nd "elementary network address conversion routines for Open System Interconnection
43.Sh SYNOPSIS
44.Fd #include <sys/types.h>
45.Fd #include <netiso/iso.h>
46.Ft struct iso_addr *
47.Fn iso_addr "char *cp"
48.Ft char *
49.Fn iso_ntoa "struct iso_addr *isoa"
50.Sh DESCRIPTION
51The routine
52.Fn iso_addr
53interprets character strings representing
54.Tn OSI
55addresses, returning binary information suitable
56for use in system calls.
57The routine
58.Fn iso_ntoa
59takes
60.Tn OSI
61addresses and returns
62.Tn ASCII
63strings representing NSAPs (network service
64access points) in a
65notation inverse to that accepted by
66.Fn iso_addr .
67.Pp
68Unfortunately, no universal standard exists for representing
69.Tn OSI
70network addresses.
71.Pp
72The format employed by
73.Fn iso_addr
74is a sequence of hexadecimal
75.Dq digits
76(optionally separated by periods),
77of the form:
78.Bd -filled -offset indent
79<hex digits>.<hex digits>.<hex digits>
80.Ed
81.Pp
82Each pair of hexadecimal digits represents a byte
83with the leading digit indicating the higher-ordered bits.
84A period following an even number of bytes has no
85effect (but may be used to increase legibility).
86A period following an odd number of bytes has the
87effect of causing the byte of address being translated
88to have its higher order bits filled with zeros.
89.Sh RETURN VALUES
90.Fn iso_ntoa
91always returns a null terminated string.
92.Fn iso_addr
93always returns a pointer to a struct iso_addr.
94(See
95.Sx BUGS . )
96.Sh SEE ALSO
97.Xr iso 4
98.Sh HISTORY
99The
100.Fn iso_addr
101and
102.Fn iso_ntoa
103functions appeared in
104.Bx 4.3 Reno .
105.Sh BUGS
106The returned values
107reside in a static memory area.
108.Pp
109The function
110.Fn iso_addr
111should diagnose improperly formed input, and there should be an unambiguous
112way to recognize this.