Function make_positional

test/printf-test.cc:24–28

Makes format string argument positional.

// Makes format string argument positional.
static auto make_positional(fmt::string_view format) -> std::string {
  std::string s(format.data(), format.size());
  s.replace(s.find('%'), 1, "%1$");
  return s;
}

// A wrapper around fmt::sprintf to workaround bogus warnings about invalid
// format strings in MSVC.