CONVERT
*retavail = CONVERT(swapary[0].ksw_total);
*retfree = CONVERT(swapary[0].ksw_total - swapary[0].ksw_used);
(intmax_t)CONVERT(nblks),
(intmax_t)CONVERT(bused),
(intmax_t)CONVERT(bavail), bpercent);
CONVERT(swtot.ksw_used), CONVERT(swtot.ksw_total));