Add the ability to get the current directory

runtime/bin/directory_posix.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 <dirent.h>
 #include <errno.h>
 #include <sys/param.h>
 #include <sys/stat.h>
@@ skipping 359 matching lines @@
     }
     ASSERT(errno == ELOOP ||
            errno == ENAMETOOLONG ||
            errno == ENOENT ||
            errno == ENOTDIR);
     return DOES_NOT_EXIST;
   }
 }
 
 
+char* Directory::Current() {
+  return getcwd(NULL, 0);
+}
+
+
 bool Directory::Create(const char* dir_name) {
   // Create the directory with the permissions specified by the
   // process umask.
   return (TEMP_FAILURE_RETRY(mkdir(dir_name, 0777)) == 0);
 }
 
 
 int Directory::CreateTemp(const char* const_template,
                           char** path,
                           char* os_error_message,
@@ skipping 28 matching lines @@
 }
 
 
 bool Directory::Delete(const char* dir_name, bool recursive) {
   if (!recursive) {
     return (TEMP_FAILURE_RETRY(remove(dir_name)) == 0);
   } else {
     return DeleteRecursively(dir_name);
   }
 }