Something

int cmd_loop(uboot_t *o, FILE *rx, FILE *tx) {
	char	done;
	struct	fd_set rfd;
	struct	fd_set efd;
	struct	timeval tv;
	int	x;
	int	max_fd;
	char	xbuf[1024];
	char	*buf;
	int	ii;
	
	done	= 0;
	max_fd	= 0;	
	if (!o || !rx) {
		return errno	= EINVAL;
	}
	if (tx) {
		stdout	= tx;
		stderr	= tx;
	}
	mbrSetArr[0].s_value=(void *)o->directory;
	mbrSetArr[0].s_size=sizeof (o->directory);
	mbrSetArr[1].s_value=(void *)o->kernel;
	mbrSetArr[1].s_size=sizeof (o->kernel);
	mbrSetArr[2].s_value=(void *)o->initrd;
	mbrSetArr[2].s_size=sizeof (o->initrd);
	mbrSetArr[3].s_value=(void *)o->command;
	mbrSetArr[3].s_size=sizeof (o->command);
	mbrSetArr[4].s_value=(void *)&o->mach;
	mbrSetArr[4].s_size=sizeof (o->mach);
	mbrSetArr[5].s_value=(void *)&o->loader;
	mbrSetArr[5].s_size=sizeof (o->loader);
	mbrSetArr[6].s_value=(void *)&o->heap;
	mbrSetArr[6].s_size=sizeof (o->heap);

	cmd_print (tx, "%s version %s, Copyright (C) 2005 Everett Coleman II\r\n", PACKAGE, VERSION);
	cmd_print (tx, "%s comes with ABSOLUTELY NO WARRANTY; for details type `help warranty'\r\n", PACKAGE);
	cmd_print (tx, "This is free software, and you are welcome to redistribute it\r\n");
	cmd_print (tx, "under certain conditions; type `help conditions' for details.\r\n\r\n");
	cmd_print (tx, "'load' code by Husam Senussi <husamsenussi@hotmail.com>, ported by me.\r\n\r\n");

	memPhysReset ();

	max_fd=fileno (rx);
	while (!done) {
		for (ii = 0; ii < 1024; ii++) {
			xbuf[ii]	= 0;
		}
		buf	= 0;
	
		cmd_print (tx, "oboot# "); // prompt
		for (; tx;) {
			tv.tv_sec	= 1;
			tv.tv_usec	= 0;
			x		= 0;

			FD_ZERO(&rfd);
			FD_ZERO(&efd);
			FD_SET(max_fd, &rfd);
			FD_SET(max_fd, &efd);

			x	= select(max_fd + 1, &rfd, 0, &efd, &tv);
			if (feof (rx) || (x < 0))
				goto break_loop;

			if (x && FD_ISSET(max_fd, &efd))
				break;
			if (x && FD_ISSET(max_fd, &rfd))
				break;
			if (wp_count ())
				wp_check (tx);
		} /* while (1) */
		buf=fgets (xbuf, sizeof (xbuf), rx);
		if (!buf && feof (rx)) {
			break;
		}
		su_eatlws (&buf);
		su_eattws (&buf);
		if (!buf[0] || (buf[0] == '#'))
			continue;
		done=cmd_process (o, rx, tx, buf);
	} /* while (!done) */
break_loop:
	cmd_print (tx, "bye.\r\n");
	memPhysReset ();
	return 0;
} /* cmd_loop */