[m-users.] Bug in posix.readdir (fixed)

[Volker Wysk]

Hi!

The readdir/4 predicate from the posix library is buggy. It returns an
"unknown error code" error for the end of the directory stream.

I've fixed it. I've changed the type from

:- pred readdir(dir::in, 
	        posix.result(string)::out, 
		io::di, io::uo) is det.

to

:- pred readdir(dir::in,
                posix.result(maybe(string))::out,
                io::di, io::uo) is det.


The new version returns "posix.ok(yes(File))" for a directory entry,
and "posix.ok(no)" for the end of the stream.

See the attached file. It should replace the posix.readdir.m file from
the posix library (after renaming from readdir to posix.readdir).

Cheers,
Volker
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