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