114 lines
3.7 KiB
Groff
114 lines
3.7 KiB
Groff
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.\" Copyright (c) 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)iso_addr.3 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD: src/lib/libc/net/iso_addr.3,v 1.7 2001/10/01 16:08:56 ru Exp $
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.\"
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.Dd June 4, 1993
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.Dt ISO_ADDR 3
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.Os
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.Sh NAME
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.Nm iso_addr ,
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.Nm iso_ntoa
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.Nd "elementary network address conversion routines for Open System Interconnection
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/types.h
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.In netiso/iso.h
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.Ft struct iso_addr *
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.Fn iso_addr "char *cp"
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.Ft char *
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.Fn iso_ntoa "struct iso_addr *isoa"
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.Sh DESCRIPTION
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The routine
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.Fn iso_addr
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interprets character strings representing
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.Tn OSI
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addresses, returning binary information suitable
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for use in system calls.
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The routine
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.Fn iso_ntoa
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takes
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.Tn OSI
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addresses and returns
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.Tn ASCII
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strings representing NSAPs (network service
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access points) in a
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notation inverse to that accepted by
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.Fn iso_addr .
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.Pp
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Unfortunately, no universal standard exists for representing
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.Tn OSI
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network addresses.
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.Pp
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The format employed by
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.Fn iso_addr
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is a sequence of hexadecimal
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.Dq digits
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(optionally separated by periods),
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of the form:
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.Bd -ragged -offset indent
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<hex digits>.<hex digits>.<hex digits>
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.Ed
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.Pp
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Each pair of hexadecimal digits represents a byte
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with the leading digit indicating the higher-ordered bits.
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A period following an even number of bytes has no
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effect (but may be used to increase legibility).
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A period following an odd number of bytes has the
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effect of causing the byte of address being translated
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to have its higher order bits filled with zeros.
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.Sh RETURN VALUES
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.Fn iso_ntoa
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always returns a null terminated string.
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.Fn iso_addr
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always returns a pointer to a struct iso_addr.
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(See
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.Sx BUGS . )
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.Sh SEE ALSO
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.Xr iso 4
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.Sh HISTORY
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The
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.Fn iso_addr
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and
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.Fn iso_ntoa
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functions appeared in
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.Bx 4.3 Reno .
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.Sh BUGS
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The returned values
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reside in a static memory area.
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.Pp
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The function
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.Fn iso_addr
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should diagnose improperly formed input, and there should be an unambiguous
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way to recognize this.
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