1 files changed, 29 insertions, 0 deletions
diff --git a/sys/osb/achtud.c b/sys/osb/achtud.c
new file mode 100644
index 00000000..0d825c3b
--- /dev/null
+++ b/sys/osb/achtud.c
@@ -0,0 +1,29 @@
+/* Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+ */
+
+#define	import_spp
+#define import_knames
+#include <iraf.h>
+
+/* ACHTU_ -- Unpack an unsigned short integer array into an SPP datatype.
+ * [MACHDEP]: The underscore appended to the procedure name is OS dependent.
+ */
+void
+ACHTUD (
+  XUSHORT  	*a,
+  XDOUBLE   	*b,
+  XINT	   	*npix
+)
+{
+	register XUSHORT *ip;
+	register XDOUBLE	 *op;
+	register int	 n = *npix;
+
+	if (sizeof(*op) >= sizeof(*ip)) {
+	    for (ip = &a[n], op = &b[n];  ip > a;  )
+		    *--op = *--ip;
+	} else {
+	    for (ip=a, op=b;  --n >= 0;  )
+		    *op++ = *ip++;
+	}
+}