avrdude: Fix string encoding handling on Windows

src/avrdude/main-standalone.cpp

@@ -0,0 +1,54 @@
+extern "C" {
+#include "avrdude.h"
+}
+
+
+#ifdef WIN32
+#include <stdlib.h>
+#include <vector>
+
+extern "C" {
+#include "windows/utf8.h"
+}
+
+struct ArgvUtf8 : std::vector<char*>
+{
+	int argc;
+
+	ArgvUtf8(int argc_w, wchar_t *argv_w[]) : std::vector<char*>(argc_w + 1, nullptr), argc(0)
+	{
+		for (int i = 0; i < argc_w; i++) {
+			char *arg_utf8 = ::wstr_to_utf8(argv_w[i], -1);
+			if (arg_utf8 != nullptr) {
+				operator[](i) = arg_utf8;
+				argc = i + 1;
+			} else {
+				break;
+			}
+		}
+	}
+
+	~ArgvUtf8()
+	{
+		for (char *arg : *this) {
+			if (arg != nullptr) {
+				::free(arg);
+			}
+		}
+	}
+};
+
+int wmain(int argc_w, wchar_t *argv_w[])
+{
+	ArgvUtf8 argv_utf8(argc_w, argv_w);
+	return ::avrdude_main(argv_utf8.argc, &argv_utf8[0]);
+}
+
+#else
+
+int main(int argc, char *argv[])
+{
+	return ::avrdude_main(argc, argv);
+}
+
+#endif