Add echo and line modes to Stdin.

runtime/bin/stdin_win.cc

Index: runtime/bin/stdin_win.cc
diff --git a/runtime/bin/stdin_win.cc b/runtime/bin/stdin_win.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e1d036e58318b7f9408c6ab2e90a134827837611
--- /dev/null
+++ b/runtime/bin/stdin_win.cc
@@ -0,0 +1,54 @@
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#include "platform/globals.h"
+#if defined(TARGET_OS_WINDOWS)
+
+#include "bin/stdin.h"
+
+
+namespace dart {
+namespace bin {
+
+int Stdin::ReadByte() {
+  HANDLE h = GetStdHandle(STD_INPUT_HANDLE);
+  uint8_t buffer[1];
+  DWORD read = 0;
+  int c = -1;
+  if (ReadFile(h, buffer, 1, &read, NULL) && read == 1) {
+    c = buffer[0];
+  }
+  return c;
+}
+
+
+void Stdin::SetEchoMode(bool enabled) {
+  HANDLE h = GetStdHandle(STD_INPUT_HANDLE);
+  DWORD mode;
+  if (!GetConsoleMode(h, &mode)) return;
+  if (enabled) {
+    mode |= ENABLE_ECHO_INPUT;
+  } else {
+    mode &= ~ENABLE_ECHO_INPUT;
+  }
+  SetConsoleMode(h, mode);
+}
+
+
+void Stdin::SetLineMode(bool enabled) {
+  HANDLE h = GetStdHandle(STD_INPUT_HANDLE);
+  DWORD mode;
+  if (!GetConsoleMode(h, &mode)) return;
+  if (enabled) {
+    mode |= ENABLE_LINE_INPUT;
+  } else {
+    mode &= ~ENABLE_LINE_INPUT;
+  }
+  SetConsoleMode(h, mode);
+}
+
+}  // namespace bin
+}  // namespace dart
+
+#endif  // defined(TARGET_OS_WINDOWS)