idivceil
(uchar_t *)calloc(1, idivceil(MAXCHKVAL, NBBY))) == NULL) {
numsect = idivceil(*ffsize, wbpb->bpb.bytes_per_sector);
numclust = idivceil(numsect, wbpb->bpb.sectors_per_cluster);
numsect = idivceil(remaining, size);
numclust = idivceil(numsect, wbpb->bpb.sectors_per_cluster);