Function esccheck

3rd/lua-5.4.3/src/llex.c:319–325

static void esccheck (LexState *ls, int c, const char *msg) {
  if (!c) {
    if (ls->current != EOZ)
      save_and_next(ls);  /* add current to buffer for error message */
    lexerror(ls, msg, TK_STRING);
  }
}


static int gethexa (LexState *ls) {