Dear vc-cvs.el maintainer,

It is sometimes useful to have unregistered subdirectories in a
directory which is under the control of CVS.  However, current
implementation of vc-cvs-dir-state in vc-cvs.el (of Emacs 21.2) does
not work if a directory contains unregistered subdirectories.  Here is
more useful implementation of vc-cvs-dir-state.  It checks if a given
subdirectory is under the control of CVS or not.  By using this,
vc-directory never get fails even if a directory contains unregistered
subdirectories.

Masanobu UMEDA
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(defun vc-cvs-dir-state (dir)
  "Find the CVS state of all files in DIR."
  ;; Get the state only if DIR is under the control of CVS.
  (if (file-readable-p (expand-file-name "CVS/Entries" dir))
      (if (vc-cvs-stay-local-p dir)
	  (vc-cvs-dir-state-heuristic dir)
	(let ((default-directory dir))
	  ;; Don't specify DIR in this command, the default-directory is
	  ;; enough.  Otherwise it might fail with remote repositories.
	  (with-temp-buffer
	    (vc-do-command t 0 "cvs" nil "status" "-l")
	    (goto-char (point-min))
	    (while (re-search-forward "^=+\n\\([^=\n].*\n\\|\n\\)+" nil t)
	      (narrow-to-region (match-beginning 0) (match-end 0))
	      (vc-cvs-parse-status)
	      (goto-char (point-max))
	      (widen)))))))