Windows: another attempt to support unicode argv

node.gyp

@@ -160,6 +160,7 @@
             'FD_SETSIZE=1024',
             # we need to use node's preferred "win32" rather than gyp's preferred "win"
             'PLATFORM="win32"',
+            '_UNICODE=1',
           ],
           'libraries': [ '-lpsapi.lib' ]
         },{ # POSIX

src/node_main.cc

@@ -21,6 +21,47 @@
 
 #include <node.h>
 
+#ifdef _WIN32
+int wmain(int argc, wchar_t *wargv[]) {
+  // Convert argv to to UTF8
+  char** argv = new char*[argc];
+  for (int i = 0; i < argc; i++) {
+    // Compute the size of the required buffer
+    DWORD size = WideCharToMultiByte(CP_UTF8,
+                                     0,
+                                     wargv[i],
+                                     -1,
+                                     NULL,
+                                     0,
+                                     NULL,
+                                     NULL);
+    if (size == 0) {
+      // This should never happen.
+      fprintf(stderr, "Could not convert arguments to utf8.");
+      exit(1);
+    }
+    // Do the actual conversion
+    argv[i] = new char[size];
+    DWORD result = WideCharToMultiByte(CP_UTF8,
+                                       0,
+                                       wargv[i],
+                                       -1,
+                                       argv[i],
+                                       size,
+                                       NULL,
+                                       NULL);
+    if (result == 0) {
+      // This should never happen.
+      fprintf(stderr, "Could not convert arguments to utf8.");
+      exit(1);
+    }
+  }
+  // Now that conversion is done, we can finally start.
+  return node::Start(argc, argv);
+}
+#else
+// UNIX
 int main(int argc, char *argv[]) {
   return node::Start(argc, argv);
 }
+#endif