width = fmt_var_width (fmt);
value = xmalloca (value_cnt_from_width (width) * sizeof *value);
ok = (datasheet_get_value (cf->datasheet, casenum, idx, value, width)
width = fmt_var_width (fmt);
value = xmalloca (value_cnt_from_width (width) * sizeof *value);
ok = (datasheet_get_value (cf->datasheet, casenum, idx, value, width)