Add the ability to get the current directory

runtime/bin/directory_win.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 <errno.h>
 #include <sys/stat.h>
 
 #include "bin/platform.h"
@@ skipping 306 matching lines @@
       return UNKNOWN;
     }
     ASSERT(errno == ENAMETOOLONG ||
            errno == ENOENT ||
            errno == ENOTDIR);
     return DOES_NOT_EXIST;
   }
 }
 
 
+char* Directory::Current() {
+  char* result;
+  int length = GetCurrentDirectory(0, NULL);
+  result = reinterpret_cast<char*>(malloc(length + 1));
+  GetCurrentDirectory(length + 1, result);
+  return result;
+}
+
+
 bool Directory::Create(const char* dir_name) {
   return (CreateDirectory(dir_name, NULL) != 0);
 }
 
 
 int Directory::CreateTemp(const char* const_template,
                           char** path,
                           char* os_error_message,
                           int os_error_message_len) {
   // Returns a new, unused directory name, modifying the contents of
@@ skipping 58 matching lines @@
 }
 
 
 bool Directory::Delete(const char* dir_name, bool recursive) {
   if (!recursive) {
     return (RemoveDirectory(dir_name) != 0);
   } else {
     return DeleteRecursively(dir_name);
   }
 }