Update .. got this far, but it just spits out the same data over and over again so I've not got the while loop quite right, any ideas?

#!/usr/bin/perl 
use strict; 
use warnings; 
my $string = '0004$ADAM0002*330005LTESTL0005STESTS0005JTESTJ0005ZTESTZ
+';
my $currentpos = 0;

while ($string) {

my $recordlength = (substr $string, $currentpos, 4)+5;
my $recordtype = substr $string, $currentpos+4, 1;
my $fragment = substr $string, $currentpos+5, $recordlength-5;
my $nextstartpos = $recordlength+1;

print " string: $string\n";
print " record type: $recordtype\n";
print " data: $fragment\n";
print " tot record length: $recordlength\n";
print " next start pos: $nextstartpos\n";

my $currentpos = $currentpos + $recordlength+1

}
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Thanks!