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# 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
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