1 files changed, 44 insertions, 0 deletions
diff --git a/sys/imfort/db/imdelf.x b/sys/imfort/db/imdelf.x
new file mode 100644
index 00000000..78be8a88
--- /dev/null
+++ b/sys/imfort/db/imdelf.x
@@ -0,0 +1,44 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<syserr.h>
+include	<imhdr.h>
+include	"idb.h"
+
+# IMDELF -- Delete a user field from the image header.  It is an error if the
+# named field does not exist.
+
+procedure imdelf (im, key)
+
+pointer	im			# image descriptor
+char	key[ARB]		# name of the new parameter
+
+int	off
+pointer	rp, sp, keyname
+int	idb_kwlookup(), idb_findrecord(), stridxs()
+errchk	syserrs
+
+begin
+	call smark (sp)
+	call salloc (keyname, SZ_FNAME, TY_CHAR)
+
+	# FITS format requires that the keyword name be upper case.
+	call strcpy (key, Memc[keyname], SZ_FNAME)
+	call strupr (Memc[keyname])
+
+	# Cannot delete standard header keywords.
+	if (idb_kwlookup (key) > 0)
+	    call syserrs (SYS_IDBNODEL, key)
+
+	# Verify that the named user field exists.
+	if (idb_findrecord (im, key, rp) <= 0)
+	    call syserrs (SYS_IDBDELNXKW, key)
+	
+	# Delete the field.
+	off = stridxs ("\n", Memc[rp])
+	if (off > 0)
+	    call strcpy (Memc[rp+off], Memc[rp], ARB)
+	else
+	    Memc[rp] = EOS
+
+	call sfree (sp)
+end