From d0eab413442d084d15a328c53fb132814daa58f3 Mon Sep 17 00:00:00 2001
From: robobuggy <geert.fannes@gmail.com>
Date: Thu, 4 Feb 2021 09:32:05 +0100
Subject: [PATCH] Fixed infinite loop in Screen::ToString() for non-printable
 chars (#69)

---
 src/ftxui/screen/screen.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/ftxui/screen/screen.cpp b/src/ftxui/screen/screen.cpp
index e2b83ad1..f98cc506 100644
--- a/src/ftxui/screen/screen.cpp
+++ b/src/ftxui/screen/screen.cpp
@@ -164,8 +164,15 @@ std::string Screen::ToString() {
       auto& pixel = pixels_[y][x];
       wchar_t c = pixel.character;
       UpdatePixelStyle(ss, previous_pixel, pixel);
+
+      auto width = wchar_width(c);
+      if (width <= 0) {
+          // Avoid an infinite loop for non-printable characters
+          c = L' ';
+          width = 1;
+      }
       ss << c;
-      x += wchar_width(c);
+      x += width;
     }
   }