1 files changed, 30 insertions, 0 deletions
diff --git a/sys/plio/plopen.x b/sys/plio/plopen.x
new file mode 100644
index 00000000..6510ebe5
--- /dev/null
+++ b/sys/plio/plopen.x
@@ -0,0 +1,30 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include <plset.h>
+include	<plio.h>
+
+# PL_OPEN -- Open a mask.  If the input buffer pointer is NULL an inactive
+# mask descriptor is allocated, otherwise the pointer is taken to point to
+# an encoded mask, which is decoded and loaded to create an active descriptor.
+
+pointer procedure pl_open (smp)
+
+pointer	smp			#I stored mask pointer or NULL
+
+pointer	pl
+errchk	calloc, pl_load
+
+begin
+	# Allocate and initialize an inactive descriptor.
+	call calloc (pl, LEN_PLDES, TY_STRUCT)
+
+	call amovki (1, PL_PLANE(pl,1), PL_MAXDIM)
+	PL_MAGIC(pl) = PL_MAGICVAL
+	PL_LLINC(pl) = PL_STARTINC
+
+	# Load the saved mask, if any.
+	if (smp != NULL)
+	    call pl_load (pl, smp)
+
+	return (pl)
+end