how 2 manage arrays & stack conflicts in m4?

[OpenMacNews]

hi all,

well, i'm slogging thru arrays (1D 1st, the multi-D ...) & stacks in m4.

my 1st, working example script:


==================================
changequote([,])dnl

dnl # Define Array
define([MY_HOST_ARRAY],      [defn(format([[array[%d]]], [$1]))])dnl
define([SET_HOST_ARRAY],     [define(format([[array[%d]]], [$1]), [$2])])dnl

define([MY_IP_ARRAY],        [defn(format([[array[%d]]], [$1]))])dnl
define([SET_IP_ARRAY],       [define(format([[array[%d]]], [$1]), [$2])])dnl

dnl # Define Loop
define([forHostLoop],
      [pushdef([$1], [$2])_forHostLoop([$1], [$2], [$3], [$4])popdef([$1])])
define([_forHostLoop],
      [$4[]ifelse($1, [$3], ,
                  [define([$1], incr($1))_forHostLoop([$1], [$2], [$3], 
[$4])])])

dnl # Identify/Define the lookup NameServer
define([MY_DNS_NAME],         [ns.domain.com])dnl

dnl # Identify/Define the Physical Hosts
SET_HOST_ARRAY(1,             [machine1.domain.com])dnl
SET_HOST_ARRAY(2,             [machine2.domain.com])dnl

dnl # Define IP address lookup
define([MY_IP_ADDR],
[esyscmd(dig @MY_DNS_NAME MY_HOST_ARRAY(1) | grep MY_HOST_ARRAY(1) | grep -v 
DiG | grep -v ";"MY_HOST_ARRAY(1) | grep -v NS | awk '{printf("%s", $ 5) 
}')])dnl

dnl # Define IP address lookup
define([MY_IP_ADDR2],
[esyscmd(dig @MY_DNS_NAME MY_HOST_ARRAY(2) | grep MY_HOST_ARRAY(2) | grep -v 
DiG | grep -v ";"MY_HOST_ARRAY(2) | grep -v NS | awk '{printf("%s", $ 5) 
}')])dnl

dnl # Define IP_ARRAY Elements
SET_IP_ARRAY(1,            MY_IP_ADDR)dnl
SET_IP_ARRAY(2,            MY_IP_ADDR2)dnl

dnl # Write Apache "LISTENs" for these IPs
forHostLoop([i], 1, 2, [Listen MY_IP_ARRAY(i):80 ]
)dnl

dnl # Write Apache "LISTENs" for these HOSTS
forHostLoop([i], 1, 2, [Listen MY_HOST_ARRAY(i):80 ]
)dnl
==================================


i'd expected SHOULD provide two sets of outputs:

        Listen 10.0.0.6:80
        Listen 10.0.0.7:80
        
        Listen machine1.domain.com:80
        Listen machine2.domain.com:80


however, what it DOES, rather, output is:

        Listen 10.0.0.6:80
        Listen 10.0.0.7:80
        
        Listen 10.0.0.6:80
        Listen 10.0.0.7:80

the 1st part IS CORRECT; the 2nd is not -- which i assume is due to the 
forHostLoop define push/pop-ing the *same* stack.

am i correct in this?  if so, to circumvent, should i change either of the 
ARRAY defs, or, rather, add a second/different Loop definition?

cheers,

richard