Implement IsAsciiUpper and IsAsciiLower in base/strings/string_util.h

sandbox/win/src/win_utils.cc

 // Copyright (c) 2011 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 "sandbox/win/src/win_utils.h"
 
 #include <stddef.h>
 
 #include <map>
 #include <memory>
@@ skipping 74 matching lines @@
   return true;
 }
 
 bool StartsWithDriveLetter(const base::string16& path) {
   if (path.size() < 3)
     return false;
 
   if (path[1] != L':' || path[2] != L'\\')
     return false;
 
-  return (path[0] >= 'a' && path[0] <= 'z') ||
-         (path[0] >= 'A' && path[0] <= 'Z');
+  return base::IsAsciiAlpha(path[0]);
 }
 
 const wchar_t kNTDotPrefix[] = L"\\\\.\\";
 const size_t kNTDotPrefixLen = arraysize(kNTDotPrefix) - 1;
 
 // Removes "\\\\.\\" from the path.
 void RemoveImpliedDevice(base::string16* path) {
   if (0 == path->compare(0, kNTDotPrefixLen, kNTDotPrefix))
     *path = path->substr(kNTDotPrefixLen);
 }
@@ skipping 312 matching lines @@
     ::InterlockedCompareExchangePointer(
         reinterpret_cast<PVOID volatile*>(&ntdll), ntdll_local, NULL);
 
   }
 
   CHECK_NT(ntdll);
   FARPROC* function_ptr = reinterpret_cast<FARPROC*>(ptr);
   *function_ptr = ::GetProcAddress(ntdll, name);
   CHECK_NT(*function_ptr);
 }