altosui: Handle Monitor Idle errors better

Deal with missing data by checking for MISSING in more places.
Handle serial communication failures during send by reporting back
from libaltos.

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 12 insertions, 2 deletions

diff --git a/altosui/AltosSerial.java b/altosui/AltosSerial.java
index c4e9c697..8b692fa9 100644
--- a/altosui/AltosSerial.java
+++ b/altosui/AltosSerial.java
@@ -54,13 +54,19 @@ public class AltosSerial extends AltosLink implements Runnable {
 	Frame frame;
 
 	public int getchar() {
+		if (altos == null)
+			return ERROR;
 		return libaltos.altos_getchar(altos, 0);
 	}
 
 	public void flush_output() {
 		super.flush_output();
 		if (altos != null) {
-			libaltos.altos_flush(altos);
+			if (libaltos.altos_flush(altos) != 0) {
+				libaltos.altos_close(altos);
+				altos = null;
+				abort_reply();
+			}
 		}
 	}
 
@@ -155,7 +161,11 @@ public class AltosSerial extends AltosLink implements Runnable {
 
 	private void putc(char c) {
 		if (altos != null)
-			libaltos.altos_putchar(altos, c);
+			if (libaltos.altos_putchar(altos, c) != 0) {
+				libaltos.altos_close(altos);
+				altos = null;
+				abort_reply();
+			}
 	}
 
 	public void print(String data) {