Strange `file-name-sans-extension' behavior

Strange `file-name-sans-extension' behavior

[Jens Schmidt]

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In GNU Emacs 21.1.1 (i386-msvc-nt4.0.1381)
 of 2001-10-22 on buffy

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

(file-name-sans-extension "sys/types.h")

-> "c:/home/jschmidt/sys/types"

I would have expected the result "sys/types".

What about the following version of `file-name-sans-extension':

(defun file-name-sans-extension (filename)
  "Return FILENAME sans final \"extension\".
The extension, in a file name, is the part that follows the last `.'."
  (let ((file (file-name-sans-versions (file-name-nondirectory filename)))
	  directory)
      (if (string-match "\\.[^.]*\\'" file)
	  (if (setq directory (file-name-directory filename))
	      (concat (file-name-as-directory directory)
                      (substring file 0 (match-beginning 0)))
	    (substring file 0 (match-beginning 0)))
	filename)))

Regards

Jens