openDir is confusing

I'm tyring to write a file tree "visitor" function and I find the  
operation of openDir/readDir to be somewhat hard to work with.

An example is always good to start with:


d = openDir("somelongpathname")
readDir(d) => "foo" -- a file
readDir(d) => "bar" -- a directory

d2 = opendir("bar")

error - no such file or directory

Of course, this is correct, because I did not pass in the full  
pathname.  Therein lies the problem, I think.  It seems as I'm  
traversing the directory, I would have to maintain the path which  
readDir is operating from.  So why doesn't readDir simply return the  
FULL path in the first place instead of just the pathname ?

Am I missing something, or should I be using some different  
functionality ?

Thanks

Brian


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