BUF_SIZ
for (bn = ((unsigned)sb.st_size / BUF_SIZ) + 1; bn >= 0; bn--) {
if (lseek(fd, (unsigned)bn * BUF_SIZ, 0) == -1) {
cc = read(fd, buf, BUF_SIZ);
CHR buf[BUF_SIZ];
if (t >= &p[BUF_SIZ])