[dart:io] Namespaces for file IO

runtime/bin/namespace_win.cc

+// Copyright (c) 2017, 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(HOST_OS_WINDOWS)
+
+#include "bin/namespace.h"
+
+#include <errno.h>
+#include <sys/stat.h>
+
+#include "bin/utils.h"
+#include "bin/utils_win.h"
+
+namespace dart {
+namespace bin {
+
+Namespace* Namespace::Create(const char* path) {
+  UNIMPLEMENTED();
+  return NULL;
+}
+
+Namespace::~Namespace() {}
+
+intptr_t Namespace::Default() {
+  return kNone;
+}
+
+const char* Namespace::GetCurrent(Namespace* namespc) {
+  int length = GetCurrentDirectoryW(0, NULL);
+  if (length == 0) {
+    return NULL;
+  }
+  wchar_t* current;
+  current = reinterpret_cast<wchar_t*>(
+      Dart_ScopeAllocate((length + 1) * sizeof(*current)));
+  GetCurrentDirectoryW(length + 1, current);
+  return StringUtilsWin::WideToUtf8(current);
+}
+
+bool Namespace::SetCurrent(Namespace* namespc, const char* path) {
+  Utf8ToWideScope system_path(path);
+  bool result = SetCurrentDirectoryW(system_path.wide()) != 0;
+  return result;
+}
+
+bool Namespace::ResolvePath(Namespace* namespc, const char* path,
+                            intptr_t* dirfd, const char** resolved_path) {
+  UNIMPLEMENTED();
+  return false;
+}
+
+NamespaceScope::NamespaceScope(Namespace* namespc, const char* path) {
+  UNIMPLEMENTED();
+}
+
+NamespaceScope::~NamespaceScope() {
+  UNIMPLEMENTED();
+}
+
+}  // namespace bin
+}  // namespace dart
+
+#endif  // defined(HOST_OS_WINDOWS)