set windows utf-8 codepage on startup via loader

1 files changed, 44 insertions, 0 deletions

diff --git a/loader/init.cpp b/loader/init.cpp
new file mode 100644
index 00000000..d6a447e0
--- /dev/null
+++ b/loader/init.cpp
@@ -0,0 +1,44 @@
+#include "impl.hpp"
+#ifdef _WIN32
+#include <windows.h>
+extern "C" __declspec(dllimport) long WINAPI RtlGetVersion (PRTL_OSVERSIONINFOEXW);
+#ifdef _MSC_VER
+#pragma comment(lib, "ntdll.lib")
+#endif
+#endif
+
+namespace floormat::loader_detail {
+
+#ifdef _WIN32
+static bool check_windows_build_number(unsigned major, unsigned minor, unsigned build)
+{
+    if (RTL_OSVERSIONINFOEXW rovi = {.dwOSVersionInfoSize = sizeof(rovi)}; !RtlGetVersion(&rovi))
+        return rovi.dwMajorVersion > major ||
+               rovi.dwMajorVersion == major && rovi.dwMinorVersion > minor ||
+               rovi.dwMajorVersion == major && rovi.dwMinorVersion == minor && rovi.dwBuildNumber >= build;
+    else
+        return false;
+}
+#endif
+
+static void system_init_()
+{
+#ifdef _WIN32
+    if (check_windows_build_number(10, 0, 17035))
+    {
+        (void)::SetConsoleOutputCP(CP_UTF8);
+        (void)::SetConsoleCP(CP_UTF8);
+    }
+#endif
+}
+
+void system_init()
+{
+    static bool once = false;
+    if (once)
+        return;
+    once = true;
+    system_init_();
+}
+
+} // namespace floormat::loader_detail