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diff --git a/sys/fmio/fmlfparse.x b/sys/fmio/fmlfparse.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<fmset.h>
+
+# FM_LFPARSE -- Parse an encoded lfile filename.
+# The filename syntax is "Tddd.fff" where
+#
+#	T	is 'B' or 'T' for text or binary
+#	ddd	is the encoded descriptor pointer
+#	fff	is the encoded lfile number
+
+int procedure fm_lfparse (lfname, fm, lfile, type)
+
+char	lfname[ARB]		#I encoded lfile filename
+pointer	fm			#O FMIO descriptor
+int	lfile			#O lfile number
+int	type			#O lfile file type (text or binary)
+
+int	ip
+int	ctoi()
+
+begin
+	# Determine file type.
+	if (lfname[1] == 'T')
+	    type = TEXT_FILE
+	else
+	    type = BINARY_FILE
+
+	# Get FMIO descriptor.
+	ip = 2
+	if (ctoi (lfname, ip, fm) <= 0)
+	    return (ERR)
+	
+	# Skip . delimiter.
+	if (lfname[ip] == '.')
+	    ip = ip + 1
+	else
+	    return (ERR)
+
+	# Get lfile number.
+	if (ctoi (lfname, ip, lfile) <= 0)
+	    return (ERR)
+
+	return (OK)
+end