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diff --git a/sys/imio/imbln1.x b/sys/imio/imbln1.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<imhdr.h>
+include	<imio.h>
+
+# IMBLN1 -- Get the length of the axes of a one dimensional subraster.
+# Must be called immediately after the get or put call that created the
+# buffer.
+
+procedure imbln1 (imdes, nx)
+
+pointer	imdes
+int	nx
+pointer	bdes
+
+begin
+	# Get pointer to most recently used buffer descriptor.
+	bdes = IM_LASTBDES(imdes)
+
+	nx = abs (BD_VE(bdes,1) - BD_VS(bdes,1)) + 1
+end