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diff --git a/sys/plio/plloop.x b/sys/plio/plloop.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<plio.h>
+
+# PLLOOP -- Increment the vector V from VS to VE (nested do loops cannot
+# be used because of the variable number of dimensions).  Return LOOP_DONE
+# when V exceeds VE.
+
+int procedure plloop (v, vs, ve, ndim)
+
+long	v[ndim]			#U vector giving current position in image
+long	vs[ndim]		#I start vector
+long	ve[ndim]		#I end vector
+int	ndim			#I vector length
+
+int	i
+
+begin
+	do i = 2, ndim {
+	    v[i] = v[i] + 1
+	    if (v[i] > ve[i]) {
+		if (i < ndim)
+		    v[i] = vs[i]
+		else
+		    break
+	    } else
+		return (LOOP_AGAIN)
+	}
+
+	return (LOOP_DONE)
+end