t_op
struct mtop t_op;
t_op.mt_op = MTFSR;
t_op.mt_count = out.offset;
if (ioctl(out.fd, MTIOCTOP, &t_op) == -1)
t_op.mt_op = MTBSR;
t_op.mt_count = 1;
if (ioctl(out.fd, MTIOCTOP, &t_op) == -1)
find_op_1char(const struct t_op *op, const struct t_op *end, const char *s)
find_op_2char(const struct t_op *op, const struct t_op *end, const char *s)