rem: integer_arg (const char *s)
add: integer_arg (const char *s, unsigned long int maxval)
context: integer_arg (const char *s){  long value;  if (xstrtol (s, NULL, 0, &value, "bB") != LONGINT_OK)    {      error (0, 0, _("invalid integer argument `%s'"), s);      usage (EXIT_FAILURE);    }  return value;}