From 6e22a10eb72b256c437a3a89f9e8309bf2c7ba84 Mon Sep 17 00:00:00 2001
From: ArthurSonzogni <sonzogniarthur@gmail.com>
Date: Wed, 25 Mar 2020 02:01:31 +0100
Subject: [PATCH] Fix compile error on OS where char is signed.

---
 src/ftxui/component/event.cpp | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/src/ftxui/component/event.cpp b/src/ftxui/component/event.cpp
index ec03648..a4c08df 100644
--- a/src/ftxui/component/event.cpp
+++ b/src/ftxui/component/event.cpp
@@ -38,14 +38,13 @@ Event Event::Special(const std::string& input) {
 
 void ParseUTF8(Receiver<char>& in, Sender<Event>& out, std::string& input) {
   char c;
-  char mask = 0b11000000;
-  for (int i = 0; i < 3; ++i) {
-    if ((input[0] & mask) == mask) {
-      if (!in->Receive(&c))
-        return;
-      input += c;
-    }
-    mask = mask >> 1 | 0b10000000;
+  unsigned char head = static_cast<unsigned char>(input[0]);
+  for (int i = 0; i < 3; ++i, head <<= 1) {
+    if ((head & 0b11000000) != 0b11000000)
+      break;
+    if (!in->Receive(&c))
+      return;
+    input += c;
   }
   out->Send(Event::Character(input));
 }