refactor: start to refactor project

src/YYCCLegacy/IOHelper.cpp

@@ -0,0 +1,37 @@
+#include "IOHelper.hpp"
+
+#include "EncodingHelper.hpp"
+#include <cstdio>
+#include <iostream>
+#include <string>
+#include <stdexcept>
+#include <memory>
+
+#if YYCC_OS == YYCC_OS_WINDOWS
+#include "WinImportPrefix.hpp"
+#include <Windows.h>
+#include "WinImportSuffix.hpp"
+#endif
+
+namespace YYCC::IOHelper {
+	
+	std::FILE* UTF8FOpen(const yycc_char8_t* u8_filepath, const yycc_char8_t* u8_mode) {
+#if YYCC_OS == YYCC_OS_WINDOWS
+
+		// convert mode and file path to wchar
+		std::wstring wmode, wpath;
+		if (!YYCC::EncodingHelper::UTF8ToWchar(u8_mode, wmode))
+			return nullptr;
+		if (!YYCC::EncodingHelper::UTF8ToWchar(u8_filepath, wpath))
+			return nullptr;
+
+		// call microsoft specified fopen which support wchar as argument.
+		return _wfopen(wpath.c_str(), wmode.c_str());
+
+#else
+		return std::fopen(EncodingHelper::ToOrdinary(u8_filepath), EncodingHelper::ToOrdinary(u8_mode));
+#endif
+	}
+
+}
+