Function StringStreamToString

tests/gtest/src/gtest.cc:2164–2180

Converts the buffer in a stringstream to an std::string, converting NUL bytes to "\\0" along the way.

// Converts the buffer in a stringstream to an std::string, converting NUL
// bytes to "\\0" along the way.
std::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();

  std::string result;
  result.reserve(static_cast<size_t>(2 * (end - start)));
  for (const char* ch = start; ch != end; ++ch) {
    if (*ch == '\0') {
      result += "\\0";  // Replaces NUL with "\\0";
    } else {
      result += *ch;
    }
  }

  return result;
}

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