fix receive for all transmission lengths.

it was working fine all along, the demo display code just didn't like the
double trailing null bytes. It's still not 100% fine (the first byte is
overwritten with a 0 byte for uneven string lengths), but since it's just
demo code that's acceptable for now

1 files changed, 5 insertions, 3 deletions

diff --git a/src/system.cc b/src/system.cc
index 1a0522d..537f0b9 100644
--- a/src/system.cc
+++ b/src/system.cc
@@ -67,9 +67,11 @@ void System::loop()
 		if (i == 127) {
 			i = 0;
 		} else if (modem_byte == 0) {
-			ohai.data = disp_buf;
-			ohai.length = i-1;
-			display.show(&ohai);
+			if (i > 1) { // workaround for trailing double null bytes
+				ohai.data = disp_buf;
+				ohai.length = i-1;
+				display.show(&ohai);
+			}
 			i = 0;
 		}
 	}