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>Chapter 38. TCP/IP Library Reference</TD
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>NS(3)                   System Library Functions Manual                  NS(3)
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NAME
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     ns_addr, ns_ntoa - Xerox NS(tm) address conversion routines
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SYNOPSIS
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     #include &lt;sys/types.h&#62;
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     #include &lt;netns/ns.h&#62;
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     struct ns_addr
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     ns_addr(char *cp);
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     char *
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     ns_ntoa(struct ns_addr ns);
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DESCRIPTION
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     The routine ns_addr() interprets character strings representing XNS
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     addresses, returning binary information suitable for use in system calls.
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     The routine ns_ntoa() takes XNS addresses and returns ASCII strings rep-
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     resenting the address in a notation in common use in the Xerox Develop-
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     ment Environment:
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           &lt;network number&#62;.&lt;host number&#62;.&lt;port number&#62;
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     Trailing zero fields are suppressed, and each number is printed in hex-
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     adecimal, in a format suitable for input to ns_addr().  Any fields lack-
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     ing super-decimal digits will have a trailing `H' appended.
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     Unfortunately, no universal standard exists for representing XNS
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     addresses.  An effort has been made to ensure that ns_addr() be compati-
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     ble with most formats in common use.  It will first separate an address
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     into 1 to 3 fields using a single delimiter chosen from period (`.'),
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     colon (`:'), or pound-sign `#'.  Each field is then examined for byte
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     separators (colon or period).  If there are byte separators, each sub-
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     field separated is taken to be a small hexadecimal number, and the
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     entirety is taken as a network-byte-ordered quantity to be zero extended
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     in the high-network-order bytes.  Next, the field is inspected for
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     hyphens, in which case the field is assumed to be a number in decimal
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     notation with hyphens separating the millenia.  Next, the field is
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     assumed to be a number: It is interpreted as hexadecimal if there is a
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     leading `0x' (as in C), a trailing `H' (as in Mesa), or there are any
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     super-decimal digits present.  It is interpreted as octal is there is a
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     leading `0' and there are no super-octal digits.  Otherwise, it is con-
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     verted as a decimal number.
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RETURN VALUES
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     None.  (See BUGS.)
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SEE ALSO
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     hosts(5), networks(5)
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HISTORY
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     The ns_addr() and ns_toa() functions appeared in 4.3BSD.
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BUGS
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     The string returned by ns_ntoa() resides in a static memory area.  The
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     function ns_addr() should diagnose improperly formed input, and there
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     should be an unambiguous way to recognize this.
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BSD                              June 4, 1993                              BSD
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