Function do_strerror_r

system/lib/libcxx/src/system_error.cpp:150–156

#  if defined(_LIBCPP_MSVCRT_LIKE)
string do_strerror_r(int ev) {
  char buffer[strerror_buff_size];
  if (::strerror_s(buffer, strerror_buff_size, ev) == 0)
    return string(buffer);
  std::snprintf(buffer, strerror_buff_size, "unknown error %d", ev);
  return string(buffer);
}
#  else

// Only one of the two following functions will be used, depending on