Standalone GN build.

core/fxcrt/fx_basic_wstring.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <cctype>
@@ skipping 561 matching lines @@
   }
   GetBuffer(nMaxLen);
   if (m_pData) {
     FXSYS_vswprintf((wchar_t*)m_pData->m_String, nMaxLen + 1,
                     (const wchar_t*)pFormat, argListSave);
     ReleaseBuffer();
   }
   va_end(argListSave);
 }
 
+const FX_WCHAR* CFX_WideString::c_str() const {
+  return m_pData ? m_pData->m_String : L"";
+}
+
 void CFX_WideString::Format(const FX_WCHAR* pFormat, ...) {
   va_list argList;
   va_start(argList, pFormat);
   FormatV(pFormat, argList);
   va_end(argList);
 }
 
 FX_STRSIZE CFX_WideString::Insert(FX_STRSIZE nIndex, FX_WCHAR ch) {
   FX_STRSIZE nNewLength = m_pData ? m_pData->m_nDataLength : 0;
   nIndex = std::max(nIndex, 0);
@@ skipping 391 matching lines @@
       FXSYS_MultiByteToWideChar(codepage, 0, bstr.c_str(), src_len, nullptr, 0);
   CFX_WideString wstr;
   if (dest_len) {
     FX_WCHAR* dest_buf = wstr.GetBuffer(dest_len);
     FXSYS_MultiByteToWideChar(codepage, 0, bstr.c_str(), src_len, dest_buf,
                               dest_len);
     wstr.ReleaseBuffer(dest_len);
   }
   return wstr;
 }