Add the ability to change the working directory

runtime/bin/directory.cc

 // Copyright (c) 2012, 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 "bin/directory.h"
 
 #include "bin/dartutils.h"
 #include "bin/thread.h"
 #include "include/dart_api.h"
 #include "platform/assert.h"
@@ skipping 14 matching lines @@
   Dart_EnterScope();
   char* current = Directory::Current();
   if (current != NULL) {
     Dart_SetReturnValue(args, DartUtils::NewString(current));
     free(current);
   }
   Dart_ExitScope();
 }
 
 
+void FUNCTION_NAME(Directory_SetCurrent)(Dart_NativeArguments args) {
+  Dart_EnterScope();
+  int argc = Dart_GetNativeArgumentCount(args);
+  Dart_Handle path;
+  if (argc == 1) {
+    path = Dart_GetNativeArgument(args, 0);
+  }
+  if (argc != 1 || !Dart_IsString(path)) {
+    Dart_SetReturnValue(args, DartUtils::NewDartArgumentError(NULL));
+  } else {
+    if (Directory::SetCurrent(DartUtils::GetStringValue(path))) {
+      Dart_SetReturnValue(args, Dart_True());
+    } else {
+      Dart_Handle err = DartUtils::NewDartOSError();
+      if (Dart_IsError(err)) Dart_PropagateError(err);
+      Dart_SetReturnValue(args, err);
+    }
+  }
+  Dart_ExitScope();
+}
+
+
 void FUNCTION_NAME(Directory_Exists)(Dart_NativeArguments args) {
   static const int kExists = 1;
   static const int kDoesNotExist = 0;
   Dart_EnterScope();
   Dart_Handle path = Dart_GetNativeArgument(args, 0);
   Directory::ExistsResult result =
       Directory::Exists(DartUtils::GetStringValue(path));
   if (result == Directory::EXISTS) {
     Dart_SetReturnValue(args, Dart_NewInteger(kExists));
   } else if (result == Directory::DOES_NOT_EXIST) {
@@ skipping 329 matching lines @@
   Dart_ThrowException(Dart_New(
       DartUtils::GetDartClass(DartUtils::kIOLibURL, "DirectoryIOException"),
       Dart_Null(),
       3,
       args));
   return true;
 }
 
 }  // namespace bin
 }  // namespace dart