From 75482d82d41d9b6663e922421d390870f00a3163 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jaros=C5=82aw=20Pelczar?=
 <47525085+jarekpelczar@users.noreply.github.com>
Date: Sat, 9 Oct 2021 11:51:00 +0200
Subject: [PATCH] Use sensible defaults in case TIOCGWINSZ fails (#224)
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This can happen for example in embedded linux, in case
the application is started via serial terminal.

Signed-off-by: Jarosław Pelczar <jarek@jpelczar.com>
Co-authored-by: ArthurSonzogni <sonzogniarthur@gmail.com>
---
 CHANGELOG.md                  | 3 +++
 src/ftxui/screen/terminal.cpp | 5 ++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 137957f3..e68a3160 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,9 @@
 
 ## Current
 
+## Bug
+- On Unix system, fallback to {80,25} screen dimension on failure.
+
 ## 0.10 (2021-09-30)
 
 ## Bug
diff --git a/src/ftxui/screen/terminal.cpp b/src/ftxui/screen/terminal.cpp
index 5f02fc02..42497846 100644
--- a/src/ftxui/screen/terminal.cpp
+++ b/src/ftxui/screen/terminal.cpp
@@ -33,8 +33,11 @@ Dimensions Terminal::Size() {
   return Dimensions{80, 80};
 
 #else
-  winsize w;
+  winsize w{};
   ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
+  if (w.ws_col == 0 || w.ws_row == 0) {
+    return Dimensions{80, 25};
+  }
   return Dimensions{w.ws_col, w.ws_row};
 #endif
 }