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better command line usage as suggested by deraadt@
ok @deraadt

/* $OpenBSD: mmc.c,v 1.5 2006/06/01 06:32:17 mjc Exp $ */
/*
 * Copyright (c) 2006 Michael Coulter <mjc@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/limits.h>
#include <sys/types.h>
#include <sys/scsiio.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "extern.h"

#define WAVHDRLEN 44
extern int errno;
extern int fd;
extern char *cdname;

int
blank(void)
{
	scsireq_t scr;
	int r;

	bzero(&scr, sizeof(scr));
	scr.cmd[0] = 0xa1;
	scr.cmd[1] = 0x01;
	scr.cmdlen = 12;
	scr.datalen = 0;
	scr.timeout = 120000;
	scr.flags = SCCMD_ESCAPE;
	scr.senselen = SENSEBUFLEN;

	r = ioctl(fd, SCIOCCOMMAND, &scr);
	if (r == -1 && errno == EPERM) {
		close(fd);
		fd = -1;
		if (! open_cd(cdname, 1))
			return (-1);
	}
	r = ioctl(fd, SCIOCCOMMAND, &scr);
	return (r == 0 ? scr.retsts : -1);
}

int
unit_ready(void)
{
	scsireq_t scr;
	int r;

	bzero(&scr, sizeof(scr));
	scr.cmd[0] = 0x00;
	scr.cmdlen = 6;
	scr.datalen = 0;
	scr.timeout = 120000;
	scr.flags = SCCMD_ESCAPE;
	scr.senselen = SENSEBUFLEN;

	r = ioctl(fd, SCIOCCOMMAND, &scr);
	return (r == 0 ? scr.retsts : -1);
}

int
synchronize_cache(void)
{
	scsireq_t scr;
	int r;

	bzero(&scr, sizeof(scr));
	scr.cmd[0] = 0x35;
	scr.cmdlen = 10;
	scr.datalen = 0;
	scr.timeout = 120000;
	scr.flags = SCCMD_ESCAPE;
	scr.senselen = SENSEBUFLEN;

	r = ioctl(fd, SCIOCCOMMAND, &scr);
	return (r == 0 ? scr.retsts : -1);
}

int
close_session(void)
{
	scsireq_t scr;
	int r;

	bzero(&scr, sizeof(scr));
	scr.cmd[0] = 0x5b;
	scr.cmd[2] = 0x02; /* close session */
	scr.cmd[5] = 0x00; /* track number */
	scr.cmdlen = 10;
	scr.datalen = 0;
	scr.timeout = 120000;
	scr.flags = SCCMD_ESCAPE;
	scr.senselen = SENSEBUFLEN;

	r = ioctl(fd, SCIOCCOMMAND, &scr);
	return (r == 0 ? scr.retsts : -1);

}

int
writetao(struct track_head *thp)
{
	u_char modebuf[70];
	struct track_info *tr;
	int r;
	u_char bdlen;

	if ((r = mode_sense_write(modebuf)) != SCCMD_OK) {
		warnx("mode sense failed: %d", r);
		return (r);
	}
	bdlen = modebuf[7];
	modebuf[2+8+bdlen] |= 0x40; /* Buffer Underrun Free Enable */
	modebuf[2+8+bdlen] |= 0x01; /* change write type to TAO */

	SLIST_FOREACH(tr, thp, track_list) {
		switch(tr->type) {
		case 'd':
			modebuf[3+8+bdlen] = 0x04; /* track mode = data */
			modebuf[4+8+bdlen] = 0x08; /* 2048 block track mode */
			modebuf[8+8+bdlen] = 0x00; /* turn off XA */
			tr->blklen = 2048;
			break;
		case 'a':
			modebuf[3+8+bdlen] = 0x00; /* track mode = audio */
			modebuf[4+8+bdlen] = 0x00; /* 2352 block track mode */
			modebuf[8+8+bdlen] = 0x00; /* turn off XA */
			tr->blklen = 2352;
			break;
		default:
			warn("impossible tracktype detected");
			break;
		}
		while (unit_ready() != SCCMD_OK)
			continue;
		if ((r = mode_select_write(modebuf)) != SCCMD_OK) {
			warnx("mode select failed: %d",r);
			return (r);
		}
		writetrack(tr);
		synchronize_cache();
	}
	fprintf(stderr,"\n");
	close_session();
	return (0);
}

int
writetrack(struct track_info *tr)
{
	u_char databuf[65536];
	scsireq_t scr;
	u_int end_lba, lba;
	u_int tmp;
	int r,rfd;
	u_char nblk;

	nblk = 65535/tr->blklen;
	bzero(&scr, sizeof(scr));
	scr.timeout = 300000;
	scr.cmd[0] = 0x2a;
	scr.cmd[1] = 0x00;
	scr.cmd[8] = nblk; /* Transfer length in blocks (LSB) */
	scr.cmdlen = 10;
	scr.databuf = (caddr_t)databuf;
	scr.datalen = nblk * tr->blklen;
	scr.senselen = SENSEBUFLEN;
	scr.flags = SCCMD_ESCAPE|SCCMD_WRITE;

	if (get_nwa(&lba) != SCCMD_OK) {
		warnx("cannot get next writable address");
		return (-1);
	}
	tmp = htobe32(lba); /* update lba in cdb */
	memcpy(&scr.cmd[2], &tmp, sizeof(tmp));

	if (tr->sz / tr->blklen + 1 > UINT_MAX || tr->sz < tr->blklen) {
		warnx("file %s has invalid size",tr->file);
		return (-1);
	}
	if (tr->type == 'a')
		tr->sz -= WAVHDRLEN;
	if (tr->sz % tr->blklen) {
		warnx("file %s is not multiple of block length %d", tr->file, tr->blklen);
		end_lba = tr->sz / tr->blklen + lba + 1;
	} else {
		end_lba = tr->sz / tr->blklen + lba;
	}
	rfd = open(tr->file, O_RDONLY, 0640);
	if (tr->type == 'a') {
		if (lseek(rfd, WAVHDRLEN, SEEK_SET) == -1)
			err(1, "seek failed");
	}
	while ((lba < end_lba) && (nblk != 0)) {
		while (lba + nblk <= end_lba) {
			read(rfd, databuf, nblk * tr->blklen);
			scr.cmd[8] = nblk;
			scr.datalen = nblk * tr->blklen;
			r = ioctl(fd, SCIOCCOMMAND, &scr);
			if (r != 0) {
				warn("ioctl failed while attempting to write");
				return (-1);
			}
			if (scr.retsts != SCCMD_OK) {
				warnx("ioctl returned bad status while attempting to write: %d", scr.retsts);
				return (r);
			}
			lba += nblk;
			fprintf(stderr,"\rLBA: 0x%06x/0x%06x",lba,end_lba);
			tmp = htobe32(lba); /* update lba in cdb */
			memcpy(&scr.cmd[2], &tmp, sizeof(tmp));
		}
		nblk--;
	}
	close(rfd);
	return (0);
}

int
mode_sense_write(unsigned char buf[])
{
	scsireq_t scr;
	int r;

	bzero(&scr, sizeof(scr));
	scr.timeout = 4000;
	scr.senselen = SENSEBUFLEN;
	scr.cmd[0] = 0x5a;
	scr.cmd[1] = 0x00;
	scr.cmd[2] = 0x05; /* Write parameters mode page */
	scr.cmd[7] = 0x00;
	scr.cmd[8] = 0x46; /* 16 for the header + size from pg. 89 mmc-r10a.pdf */
	scr.cmdlen = 10;
	scr.datalen= 0x46; 
	scr.flags = SCCMD_ESCAPE|SCCMD_READ;
	scr.databuf = (caddr_t)buf;

	r = ioctl(fd, SCIOCCOMMAND, &scr);
	return (r == 0 ? scr.retsts : -1);
}

int
mode_select_write(unsigned char buf[])
{
	scsireq_t scr;
	int r;

	bzero(&scr, sizeof(scr));
	scr.timeout = 4000;
	scr.senselen = SENSEBUFLEN;
	scr.cmd[0] = 0x55;
	scr.cmd[1] = 0x10; /* pages aren't vendor specific */
	scr.cmd[2] = 0x00;
	scr.cmd[7] = 0x00;
	scr.cmd[8] = 2 + buf[1] + 256 * buf[0];
	scr.cmdlen = 10;
	scr.datalen = 2 + buf[1] + 256 * buf[0];
	scr.flags = SCCMD_ESCAPE|SCCMD_WRITE;
	scr.databuf = (caddr_t)buf;

	r = ioctl(fd, SCIOCCOMMAND, &scr);
	return (r == 0 ? scr.retsts : -1);
}

int
get_nwa(int *nwa)
{
	u_char databuf[28];
	scsireq_t scr;
	int r,tmp;

	bzero(&scr, sizeof(scr));
	scr.timeout = 4000;
	scr.senselen = SENSEBUFLEN;
	scr.cmd[0] = 0x52; /* READ TRACK INFO */
	scr.cmd[1] = 0x01;
	scr.cmd[5] = 0xff; /* Invisible Track */
	scr.cmd[7] = 0x00;
	scr.cmd[8] = 0x1c;
	scr.cmdlen = 10;
	scr.datalen= 0x1c; 
	scr.flags = SCCMD_ESCAPE|SCCMD_READ;
	scr.databuf = (caddr_t)databuf;

	r = ioctl(fd, SCIOCCOMMAND, &scr);
	memcpy(&tmp, &databuf[12], sizeof(tmp));
	*nwa = betoh32(tmp);
	return (r == 0 ? scr.retsts : -1);
}