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Joel Sherrill
131
cpukit/libnetworking/libc/ns.3
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131
cpukit/libnetworking/libc/ns.3
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.\" Copyright (c) 1986, 1991, 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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.\" @(#)ns.3 8.1 (Berkeley) 6/4/93
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.\" $Id$
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.\"
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.Dd June 4, 1993
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.Dt NS 3
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.Os BSD 4.3
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.Sh NAME
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.Nm ns_addr ,
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.Nm ns_ntoa
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.Nd Xerox
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.Tn NS Ns (tm)
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address conversion routines
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.Sh SYNOPSIS
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.Fd #include <sys/types.h>
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.Fd #include <netns/ns.h>
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.Ft struct ns_addr
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.Fn ns_addr "char *cp"
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.Ft char *
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.Fn ns_ntoa "struct ns_addr ns"
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.Sh DESCRIPTION
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The routine
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.Fn ns_addr
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interprets character strings representing
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.Tn XNS
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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 ns_ntoa
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takes
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.Tn XNS
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addresses and returns
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.Tn ASCII
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strings representing the address in a
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notation in common use in the Xerox Development Environment:
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.Bd -filled -offset indent
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<network number>.<host number>.<port number>
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.Ed
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.Pp
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Trailing zero fields are suppressed, and each number is printed in hexadecimal,
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in a format suitable for input to
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.Fn ns_addr .
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Any fields lacking super-decimal digits will have a
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trailing
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.Ql H
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appended.
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.Pp
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Unfortunately, no universal standard exists for representing
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.Tn XNS
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addresses.
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An effort has been made to insure that
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.Fn ns_addr
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be compatible with most formats in common use.
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It will first separate an address into 1 to 3 fields using a single delimiter
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chosen from
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period
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.Ql \&. ,
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colon
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.Ql \&:
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or pound-sign
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.Ql \&# .
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Each field is then examined for byte separators (colon or period).
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If there are byte separators, each subfield separated is taken to be
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a small hexadecimal number, and the entirety is taken as a network-byte-ordered
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quantity to be zero extended in the high-network-order bytes.
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Next, the field is inspected for hyphens, in which case
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the field is assumed to be a number in decimal notation
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with hyphens separating the millenia.
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Next, the field is assumed to be a number:
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It is interpreted
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as hexadecimal if there is a leading
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.Ql 0x
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(as in C),
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a trailing
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.Ql H
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(as in Mesa), or there are any super-decimal digits present.
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It is interpreted as octal is there is a leading
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.Ql 0
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and there are no super-octal digits.
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Otherwise, it is converted as a decimal number.
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.Sh RETURN VALUES
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None. (See
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.Sx BUGS . )
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.Sh SEE ALSO
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.Xr hosts 5 ,
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.Xr networks 5
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.Sh HISTORY
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The
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.Fn ns_addr
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and
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.Fn ns_toa
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functions appeared in
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.Bx 4.3 .
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.Sh BUGS
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The string returned by
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.Fn ns_ntoa
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resides in a static memory area.
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The function
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.Fn ns_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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