Function StringStreamToString

engine/source/testing/googleTest/src/gtest.cc:1735–1752

Converts the buffer in a stringstream to a String, converting NUL bytes to "\\0" along the way.

// Converts the buffer in a stringstream to a String, converting NUL
// bytes to "\\0" along the way.
String StringStreamToString(::std::stringstream* ss) {
  const ::std::string& str = ss->str();
  const char* const start = str.c_str();
  const char* const end = start + str.length();

  // We need to use a helper stringstream to do this transformation
  // because String doesn't support push_back().
  ::std::stringstream helper;
  for (const char* ch = start; ch != end; ++ch) {
    if (*ch == '\0') {
      helper << "\\0";  // Replaces NUL with "\\0";
    } else {
      helper.put(*ch);
    }
  }

  return String(helper.str().c_str());
}

// Appends the user-supplied message to the Google-Test-generated message.
String AppendUserMessage(const String& gtest_msg,