From dfd6c08655f7a0ac0e93e3227b0b54ef19a6df1f Mon Sep 17 00:00:00 2001
From: tomsmeding <tom.smeding@gmail.com>
Date: Sat, 14 Jan 2017 21:49:03 +0100
Subject: Check error conditions from tgetkey()

---
 manager.cpp | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/manager.cpp b/manager.cpp
index 0bdd0a4..f2f9ab2 100644
--- a/manager.cpp
+++ b/manager.cpp
@@ -204,6 +204,16 @@ int Manager::io(){
 		redraw();
 
 		int key=tgetkey();
+		if(key<0){
+			cerr<<"Input read error: key="<<key<<endl;
+			key=tgetkey();
+			if(key<0){
+				cerr<<"Input double read error: key="<<key<<endl;
+				break;
+			} else {
+				receive({"error","Standard input is unreliable!"});
+			}
+		}
 
 		Either<bool,Command> ret=global_keyinput.input(key);
 		if(ret.isLeft()){
@@ -250,6 +260,11 @@ Maybe<string> Manager::promptString(const string &promptString){
 		redraw();
 
 		int key=tgetkey();
+		if(key<0){
+			cerr<<"Input read error in promptString: key="<<key<<endl;
+			fillrect(0,termsize.h-1,termsize.w,1,' ');
+			return {};
+		}
 
 		Either<bool,Command> ret=global_keyinput.input(key);
 		if(ret.isLeft()){
@@ -286,6 +301,11 @@ char Manager::promptChar(const string &promptString,const string &options,char d
 
 	while(true){
 		int key=tgetkey();
+		if(key<0){
+			cerr<<"Input read error in promptChar: key="<<key<<endl;
+			fillrect(0,termsize.h-1,termsize.w,1,' ');
+			return def;
+		}
 		if(key==KEY_ESC)return def;
 		if(key<=0||key>=127){
 			bel();
-- 
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