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diff --git a/sys/fio/fnldir.x b/sys/fio/fnldir.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# FNLDIR -- Extract the logical directory prefix from a virtual file name,
+# e.g., the "ldir$" field in  "ldir$root.extn",  or the field "ldir$a/b/"
+# in the vfn  "ldir$a/b/file.xtn".  Both logical and OS dependent directory
+# prefixes are successfully extracted.  The prefix returned is the (logical
+# or explicit) file name of the directory containing the named file.  If the
+# VFN contains no logical directory field, the null string is returned,
+# signifying the current directory.  The number of chars in the directory
+# prefix is returned as the function value.
+
+int procedure fnldir (vfn, outstr, maxch)
+
+char	vfn[ARB], outstr[maxch]
+int	maxch
+int	root_offset, extn_offset
+int	gstrcpy()
+
+begin
+	call zfnbrk (vfn, root_offset, extn_offset)
+	return (gstrcpy (vfn[1], outstr, min (maxch, root_offset-1)))
+end