diff --git a/lang/occam/lib/chan_strct.c b/lang/occam/lib/chan_strct.c
new file mode 100644
index 000000000..5fcb3e8b7
--- /dev/null
+++ b/lang/occam/lib/chan_strct.c
@@ -0,0 +1,39 @@
+/*	chan_struct.c - channel routines for more structured objects */
+#include "ocm_chan.h"
+
+void cbyte_in(b, c) char *b; chan *c;
+{
+	long v;
+	chan_in(&v, c);
+	*b= (char) v;
+}
+
+void c_wa_in(a, z, c) register long *a; register unsigned z; register chan *c;
+{
+	do
+		chan_in(a++, c);
+	while (--z!=0);
+}
+
+void c_ba_in(a, z, c) register char *a; register unsigned z; register chan *c;
+{
+	do {
+		long v;
+		chan_in(&v, c);
+		*a++ = (char) v;
+	} while (--z!=0);
+}
+
+void c_wa_out(a, z, c) register long *a; register unsigned z; register chan *c;
+{
+	do
+		chan_out(*a++, c);
+	while (--z!=0);
+}
+
+void c_ba_out(a, z, c) register char *a; register unsigned z; register chan *c;
+{
+	do
+		chan_out((long) (*a++ &0377), c);
+	while (--z!=0);
+}