The original Quake 2 sources as originally released under the GPL license on December 21, 2001.

null/in_null.c

@@ -0,0 +1,36 @@
+// in_null.c -- for systems without a mouse
+
+#include "../client/client.h"
+
+void IN_Init (void)
+{
+}
+
+void IN_Shutdown (void)
+{
+}
+
+void IN_Commands (void)
+{
+}
+
+void IN_Frame (void)
+{
+}
+
+void IN_Move (usercmd_t *cmd)
+{
+}
+
+void IN_Activate (qboolean active)
+{
+}
+
+void IN_ActivateMouse (void)
+{
+}
+
+void IN_DeactivateMouse (void)
+{
+}
+