4.3BSD - /usr/man/cat3/ns_ntoa.0

NS(3N)                                                                  NS(3N)


NAME
       ns_addr, ns_ntoa - Xerox NS(tm)  address conversion routines

SYNOPSIS
       #include <sys/types.h>
       #include <netns/ns.h>

       struct ns_addr ns_addr(cp)
       char *cp;

       char *ns_ntoa(ns)
       struct ns_addr ns;

DESCRIPTION
       The  routine  ns_addr  interprets  character  strings  representing XNS
       addresses, returning binary information  suitable  for  use  in  system
       calls.   ns_ntoa  takes  XNS addresses and returns ASCII strings repre‐
       senting the address in a notation in common use in the  Xerox  Develop‐
       ment Environment:
            <network number>.<host number>.<port number>
       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 insure 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
       subfield  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 deci‐
       mal  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 converted as a decimal number.

SEE ALSO
       hosts(5), networks(5),

DIAGNOSTICS
       None (see BUGS).

BUGS
       The string returned by ns_ntoa resides in a static memory area.
       ns_addr should diagnose improperly formed input, and there should be an
       unambiguous way to recognize this.


4.3 Berkeley Distribution        May 12, 1986                           NS(3N)