Cleanup in //runtime/bin

runtime/bin/directory_linux.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_LINUX)
 
 #include "bin/directory.h"
 
 #include <dirent.h>  // NOLINT
@@ skipping 348 matching lines @@
     ASSERT((errno == ELOOP) ||
            (errno == ENAMETOOLONG) ||
            (errno == ENOENT) ||
            (errno == ENOTDIR));
     return DOES_NOT_EXIST;
   }
 }
 
 
 char* Directory::CurrentNoScope() {
-  char buffer[PATH_MAX];
-  if (getcwd(buffer, PATH_MAX) == NULL) {
-    return NULL;
-  }
-  return strdup(buffer);
+  return getcwd(NULL, 0);
 }
 
 
 const char* Directory::Current() {
   char buffer[PATH_MAX];
   if (getcwd(buffer, PATH_MAX) == NULL) {
     return NULL;
   }
   return DartUtils::ScopedCopyCString(buffer);
 }
 
 
 bool Directory::SetCurrent(const char* path) {
-  return NO_RETRY_EXPECTED(chdir(path)) == 0;
+  return (NO_RETRY_EXPECTED(chdir(path)) == 0);
 }
 
 
 bool Directory::Create(const char* dir_name) {
   // Create the directory with the permissions specified by the
   // process umask.
   int result = NO_RETRY_EXPECTED(mkdir(dir_name, 0777));
   // If the directory already exists, treat it as a success.
   if ((result == -1) && (errno == EEXIST)) {
     return (Exists(dir_name) == EXISTS);
@@ skipping 64 matching lines @@
     return DeleteRecursively(&path);
   }
 }
 
 
 bool Directory::Rename(const char* path, const char* new_path) {
   ExistsResult exists = Exists(path);
   if (exists != EXISTS) {
     return false;
   }
-  return NO_RETRY_EXPECTED(rename(path, new_path)) == 0;
+  return (NO_RETRY_EXPECTED(rename(path, new_path)) == 0);
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_LINUX)