base: Fix file_util_win.cc temp file random name generation.

base/file_util_win.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/file_util.h"
 
 #include <windows.h>
 #include <psapi.h>
 #include <shellapi.h>
 #include <shlobj.h>
 #include <time.h>
 
 #include <algorithm>
 #include <limits>
 #include <string>
 
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/process_util.h"
+#include "base/rand_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/time.h"
 #include "base/win/scoped_handle.h"
 #include "base/win/windows_version.h"
 
 using base::FilePath;
 
@@ skipping 333 matching lines @@
   *temp_file = FilePath(long_temp_name_str);
   return true;
 }
 
 bool CreateTemporaryDirInDir(const FilePath& base_dir,
                              const FilePath::StringType& prefix,
                              FilePath* new_dir) {
   base::ThreadRestrictions::AssertIOAllowed();
 
   FilePath path_to_create;
-  srand(static_cast<uint32>(time(NULL)));
 
   for (int count = 0; count < 50; ++count) {
     // Try create a new temporary directory with random generated name. If
     // the one exists, keep trying another path name until we reach some limit.
     string16 new_dir_name;
     new_dir_name.assign(prefix);
     new_dir_name.append(base::IntToString16(::base::GetCurrentProcId()));
     new_dir_name.push_back('_');
-    new_dir_name.append(base::IntToString16(rand() % kint16max));
+    new_dir_name.append(base::IntToString16(base::RandInt(0, kint16max)));
 
     path_to_create = base_dir.Append(new_dir_name);
     if (::CreateDirectory(path_to_create.value().c_str(), NULL)) {
       *new_dir = path_to_create;
       return true;
     }
   }
 
   return false;
 }
@@ skipping 337 matching lines @@
 
   // Length of |path| with path separator appended.
   size_t prefix = path.StripTrailingSeparators().value().size() + 1;
   // The whole path string must be shorter than MAX_PATH. That is, it must be
   // prefix + component_length < MAX_PATH (or equivalently, <= MAX_PATH - 1).
   int whole_path_limit = std::max(0, MAX_PATH - 1 - static_cast<int>(prefix));
   return std::min(whole_path_limit, static_cast<int>(max_length));
 }
 
 }  // namespace file_util