From 63672a28d5cf5f74d22a15f3cc9e4066366a3991 Mon Sep 17 00:00:00 2001
From: Markus Gans <guru@server.home.net>
Date: Tue, 3 Nov 2020 13:05:01 +0100
Subject: [PATCH] Use FIONREAD to get the number of characters available for
 reading on stdin

---
 ChangeLog          |  4 ++++
 examples/hello.cpp |  3 ---
 src/fkeyboard.cpp  | 11 ++++++++++-
 3 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 58d631eb..64b588a8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2020-11-03  Markus Gans  <guru.mail@muenster.de>
+	* Use FIONREAD to get the number of characters available 
+	  for reading on stdin
+
 2020-11-02  Markus Gans  <guru.mail@muenster.de>
 	* Non-blocking reading before timeout after keystroke
 	* Every fourth event processing causes a terminal flush
diff --git a/examples/hello.cpp b/examples/hello.cpp
index 0ac66b9b..613711c2 100644
--- a/examples/hello.cpp
+++ b/examples/hello.cpp
@@ -28,9 +28,6 @@ int main (int argc, char* argv[])
   // Create the application object
   finalcut::FApplication app{argc, argv};
 
-  // Enable the non-blocking reading mode
-  //app.setNonBlockingRead();
-
   // Create a simple dialog box
   finalcut::FMessageBox mbox{&app};
   mbox.setText("Hello world");
diff --git a/src/fkeyboard.cpp b/src/fkeyboard.cpp
index dcacb060..a27f5c97 100644
--- a/src/fkeyboard.cpp
+++ b/src/fkeyboard.cpp
@@ -21,9 +21,11 @@
 ***********************************************************************/
 
 #include <fcntl.h>
+#include <sys/ioctl.h>
 
 #if defined(__CYGWIN__)
   #include <sys/select.h>  // need for FD_ZERO, FD_SET, FD_CLR, ...
+  #include <sys/socket.h>  // need for FIONREAD
 #endif
 
 #include <algorithm>
@@ -466,7 +468,14 @@ FKey FKeyboard::UTF8decode (const char utf8[]) const
 inline ssize_t FKeyboard::readKey()
 {
   setNonBlockingInput();
-  const ssize_t bytes = read(FTermios::getStdIn(), &read_character, 1);
+  int len{0};
+
+  if ( ioctl(FTermios::getStdIn(), FIONREAD, &len) >= 0 && len > int(FIFO_BUF_SIZE) )
+    len = int(FIFO_BUF_SIZE);
+  else
+    len = 1;
+
+  const ssize_t bytes = read(FTermios::getStdIn(), &read_character, std::size_t(len));
   unsetNonBlockingInput();
   return bytes;
 }