Function luaS_normstr

third-party/lua-5.5.0/src/lstring.c:344–352

** Normalize an external string: If it is short, internalize it. */

** Normalize an external string: If it is short, internalize it.
*/
TString *luaS_normstr (lua_State *L, TString *ts) {
  size_t len = ts->u.lnglen;
  if (len > LUAI_MAXSHORTLEN)
    return ts;  /* long string; keep the original */
  else {
    const char *str = getlngstr(ts);
    return internshrstr(L, str, len);
  }
}