1 files changed, 45 insertions, 0 deletions
diff --git a/sys/fmio/fmlfname.x b/sys/fmio/fmlfname.x
new file mode 100644
index 00000000..1d0b92e7
--- /dev/null
+++ b/sys/fmio/fmlfname.x
@@ -0,0 +1,45 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<fmset.h>
+include	"fmio.h"
+
+# FM_LFNAME -- Encode the pseudo-filename for an lfile.  This is necessary to
+# pass all lfile info through FIO, when opening a file descriptor on an lfile.
+#
+# 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
+
+procedure fm_lfname (fm, lfile, type, lfname, maxch)
+
+pointer	fm			#I FMIO descriptor
+int	lfile			#I lfile number
+int	type			#I file type, text or binary
+char	lfname[maxch]		#O encoded lfile filename
+int	maxch			#I max chars out
+
+int	op
+int	itoc()
+errchk	fmio_bind, fmio_errchk
+
+begin
+	call fmio_bind (fm)
+	call fmio_errchk (fm)
+	if (maxch <= 0)
+	    return
+
+	op = 1
+	if (type == TEXT_FILE)
+	    lfname[op] = 'T'
+	else
+	    lfname[op] = 'B'
+	op = min (maxch, op + 1)
+
+	op = min (maxch, op + itoc (fm, lfname[op], maxch-op+1))
+	lfname[op] = '.'
+	op = min (maxch, op + 1)
+	op = min (maxch, op + itoc (lfile, lfname[op], maxch-op+1))
+	lfname[op] = EOS
+end