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\ Hypervisor Software File: inet.fth
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id: @(#)inet.fth 1.1 04/09/07
purpose: IPV4 address manipulation functions
copyright: Copyright 2004 Sun Microsystems, Inc.  All Rights Reserved
copyright: Use is subject to license terms.

headerless

: decimal-byte? ( adr,len -- byte true | false )
   $dnumber 0=  dup  if
      over  0 d# 255 between 0=  if  2drop false  then
   then
;

\ Interpret IPV4 dotted-decimal string and return IP address as a number.
: inet-addr ( ip$ -- ip# false | true )
   0 /ip-addr 0  do					( $ n )
      >r						( $ ) ( r: n )
      ascii . left-parse-string decimal-byte? 0=  if	( $' )
         2drop r> drop true unloop exit
      then						( $' byte )
      r> d# 8 lshift or					( $' n' ) ( r: )
   loop							( $' n' )
   over if  3drop true  else  nip nip false  then	( ip# false | true )
;

\ Convert network byte ordered IPV4 address to its string representation,
\ returning a pointer to the dotted-decimal string.
: inet-ntoa ( ipaddr -- str len )
   base @ >r  decimal
   <# 1 /ip-addr 1- do dup i ca+ c@ u#s ascii . hold drop -1 +loop c@ u#s u#>
   r> base !
;

\ Convert IPV4 dotted-decimal string to its numeric form. The 'adr'
\ argument points to a buffer where the numeric address is stored.
\ Return true on successful conversion; false otherwise.
: inet-aton ( ip$ adr -- ok? )
   /ip-addr bounds do
      ascii . left-parse-string decimal-byte? 0=  if
         2drop false unloop exit
      then  i c!
   loop  0= nip 
;

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