Add the ability to change the working directory

runtime/bin/directory_macos.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 "platform/globals.h"
 #if defined(TARGET_OS_MACOS)
 
 #include "bin/directory.h"
 
 #include <dirent.h>  // NOLINT
@@ skipping 402 matching lines @@
     return DOES_NOT_EXIST;
   }
 }
 
 
 char* Directory::Current() {
   return getcwd(NULL, 0);
 }
 
 
+bool Directory::SetCurrent(const char* path) {
+  int result = TEMP_FAILURE_RETRY(chdir(path));
+  return result == 0;
+}
+
+
 bool Directory::Create(const char* dir_name) {
   // Create the directory with the permissions specified by the
   // process umask.
   int result = TEMP_FAILURE_RETRY(mkdir(dir_name, 0777));
   // If the directory already exists, treat it as a success.
   if (result == -1 && errno == EEXIST) {
     return (Exists(dir_name) == EXISTS);
   }
   return (result == 0);
 }
@@ skipping 50 matching lines @@
 bool Directory::Rename(const char* path, const char* new_path) {
   ExistsResult exists = Exists(path);
   if (exists != EXISTS) return false;
   return (TEMP_FAILURE_RETRY(rename(path, new_path)) == 0);
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_MACOS)