fblocks
fseekp = feobp = fblocks = 0;
for (i = 0; i < fblocks; i++)
if (buf >= fblocks) {
nfbuf = xcalloc((size_t)(fblocks + 2), sizeof(*nfbuf));
fbuf[fblocks] = xcalloc(BUFSIZE, sizeof(Char));
fblocks++;
feobp = fseekp = fblocks * BUFSIZE;
fblocks -= sb;
fblocks = 1;