Parsing a directory

I’m working on a project that needs to recursively find every file in a directory structure and I found some code to get started with at: https://www.rosettacode.org/wiki/Walk_a_directory/Recursively#Forth

It is not doing what it is supposed to do and I hope to improve on it, but I’ve run into a stumbling block.

I can’t seem to be able to open directories to see if I’ve fallen into a symbolic loop.

For example, a symbolic link pointing to “../” will cause it to overflow real quickly.

The only solution I can think of is to look for duplicate names, but that has far too many false positives.

Here’s my code, and I’m hoping someone can suggest an alternative:

: $append ( from len to -- )   2DUP >R >R  COUNT + SWAP MOVE  R> R@ C@ + R> C! ;

: dots? ( name len -- ? )
\  2dup s" ." compare 0= if  2drop true exit  then
\  s" .." compare 0= if  true exit  then
  drop c@ [char] . = if  true exit  then
  false ;
 
: (ls-r) ( dir len -- )
  pad c@ >r  dup >r  pad count >r >r  pad $append  s" /" pad $append
  r> r> 2dup + 1- r> 2 + search nip nip if
    ."  -> loop detected"  r> pad c!  exit  then  ( duplicate) 
  pad count open-dir if  drop  r> pad c!  exit  then  ( dirid)
  begin
    dup pad count + 256 rot read-dir throw
  while
    pad count + over dots? 0= if   \ ignore current and parent dirs
      cr dup pad count rot + type
      pad count + swap recurse
    else drop then 
  repeat
  drop  r> pad c!
  close-dir throw
;

: ls-r ( dir len -- )  0 pad c!  (ls-r) ;
 
s" ." ls-r cr

DaR