Add echo and line modes to Stdin.

runtime/bin/stdin_linux.cc

+// 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_LINUX)
+
+#include <termios.h>  // NOLINT
+
+#include "bin/stdin.h"
+
+
+namespace dart {
+namespace bin {
+
+int Stdin::ReadByte() {
+  int c = getchar();
+  if (c == EOF) {
+    c = -1;
+  }
+  return c;
+}
+
+
+void Stdin::setEchoMode(bool enabled) {
+  struct termios term;
+  tcgetattr(fileno(stdin), &term);
+  if (enabled) {
+    term.c_lflag |= ECHO;
+  } else {
+    term.c_lflag &= ~(ECHO|ECHONL);

[Søren Gjesse, 2013/07/24 12:18:49]

Why is ECHONL not turned on above - is it turned on initially?

[Anders Johnsen, 2013/07/24 12:57:49]

Done.

+  }
+  tcsetattr(fileno(stdin), TCSANOW, &term);
+}
+
+
+void Stdin::setLineMode(bool enabled) {
+  struct termios term;
+  tcgetattr(fileno(stdin), &term);
+  if (enabled) {
+    term.c_lflag |= ICANON;
+  } else {
+    term.c_lflag &= ~(ICANON);
+  }
+  tcsetattr(fileno(stdin), TCSANOW, &term);
+}
+
+}  // namespace bin
+}  // namespace dart
+
+#endif  // defined(TARGET_OS_LINUX)
+