static inline size_t err_columns_index(size_t arysz, size_t idx)
{
	if (idx >= arysz)
		errx(EXIT_FAILURE, _("too many columns specified, "
				     "the limit is %zu columns"),
				arysz - 1);
	return idx;
}
static inline size_t err_columns_index(size_t arysz, size_t idx)
{
	if (idx >= arysz)
		errx(EXIT_FAILURE, _("too many columns specified, "
				     "the limit is %zu columns"),
				arysz - 1);
	return idx;
}