Add fuzzer for termin_input_parser

Current state: the fuzzer find interesting input immediately...
```
terminate called after throwing an instance of 'std::range_error'
  what():  wstring_convert::from_bytes
```

See: https://github.com/ArthurSonzogni/FTXUI/issues/118

CMakeLists.txt

@@ -18,12 +18,11 @@ project(ftxui
   VERSION 0.6.${git_version}
 )
 
-option(FTXUI_BUILD_EXAMPLES "Set to ON to build examples" ON)
-option(FTXUI_ENABLE_INSTALL "Generate the install target" ON)
-option(FTXUI_BUILD_TESTS "Set to ON to build tests" OFF)
 option(FTXUI_BUILD_DOCS "Set to ON to build tests" ON)
-
+option(FTXUI_BUILD_EXAMPLES "Set to ON to build examples" ON)
-enable_testing()
+option(FTXUI_BUILD_TESTS "Set to ON to build tests" OFF)
+option(FTXUI_BUILD_TESTS_FUZZER "Set to ON to enable fuzzing" OFF)
+option(FTXUI_ENABLE_INSTALL "Generate the install target" ON)
 
 find_package(Threads)
 
@@ -209,6 +208,7 @@ export(TARGETS screen dom component NAMESPACE ftxui::
 
 
 if (FTXUI_BUILD_TESTS AND ${CMAKE_VERSION} VERSION_GREATER "3.11.4")
+  enable_testing()
   set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
 
   set(FETCHCONTENT_UPDATES_DISCONNECTED TRUE)
@@ -254,6 +254,26 @@ if (FTXUI_BUILD_TESTS AND ${CMAKE_VERSION} VERSION_GREATER "3.11.4")
   )
 
   set_property(TARGET tests PROPERTY CXX_STANDARD 17)
+
+  if (FTXUI_BUILD_TESTS_FUZZER)
+    set(CMAKE_C_COMPILER clang)
+    set(CMAKE_CXX_COMPILER clang++)
+    add_executable(terminal_input_parser_test_fuzz
+      src/ftxui/component/terminal_input_parser_test_fuzz.cpp
+    )
+    target_include_directories(terminal_input_parser_test_fuzz
+      PRIVATE src
+    )
+    target_link_libraries(terminal_input_parser_test_fuzz
+      PRIVATE component
+    )
+    target_compile_options(terminal_input_parser_test_fuzz
+      PRIVATE -fsanitize=fuzzer,address
+    )
+    target_link_libraries(terminal_input_parser_test_fuzz
+      PRIVATE -fsanitize=fuzzer,address
+    )
+  endif()
 endif()
 
 if(FTXUI_BUILD_EXAMPLES)

include/ftxui/component/receiver.hpp

@@ -70,6 +70,7 @@ class ReceiverImpl {
     senders_++;
     return std::unique_ptr<SenderImpl<T>>(new SenderImpl<T>(this));
   }
+  ReceiverImpl() { senders_ = 0; }
 
   bool Receive(T* t) {
     while (senders_ || !queue_.empty()) {
@@ -109,7 +110,7 @@ class ReceiverImpl {
   std::mutex mutex_;
   std::queue<T> queue_;
   std::condition_variable notifier_;
-  std::atomic<int> senders_ = 0;
+  std::atomic<int> senders_;
 };
 
 template <class T>

src/ftxui/component/terminal_input_parser_test_fuzz.cpp

@@ -0,0 +1,19 @@
+//#include "ftxui/component/event.hpp"
+//#include "ftxui/component/receiver.hpp"
+#include "ftxui/component/terminal_input_parser.hpp"
+#include <vector>
+
+extern "C" int LLVMFuzzerTestOneInput(const char* data, size_t size) {
+  using namespace ftxui;
+  auto event_receiver = MakeReceiver<Event>();
+  {
+    auto parser = TerminalInputParser(event_receiver->MakeSender());
+    for (size_t i = 0; i < size; ++i)
+      parser.Add(data[i]);
+  }
+
+  Event received;
+  while (event_receiver->Receive(&received))
+    ;
+  return 0;  // Non-zero return values are reserved for future use.
+}