static int check_for_audio_disc()

in cdrom.c [1214:1266]

• 44 lines of code
• 12 McCabe index (conditional complexity)

static int check_for_audio_disc(struct cdrom_device_info *cdi,
				const struct cdrom_device_ops *cdo)
{
        int ret;
	tracktype tracks;
	cd_dbg(CD_OPEN, "entering check_for_audio_disc\n");
	if (!(cdi->options & CDO_CHECK_TYPE))
		return 0;
	if (cdo->drive_status != NULL) {
		ret = cdo->drive_status(cdi, CDSL_CURRENT);
		cd_dbg(CD_OPEN, "drive_status=%d\n", ret);
		if (ret == CDS_TRAY_OPEN) {
			cd_dbg(CD_OPEN, "the tray is open...\n");
			/* can/may i close it? */
			if (CDROM_CAN(CDC_CLOSE_TRAY) &&
			    cdi->options & CDO_AUTO_CLOSE) {
				cd_dbg(CD_OPEN, "trying to close the tray\n");
				ret=cdo->tray_move(cdi,0);
				if (ret) {
					cd_dbg(CD_OPEN, "bummer. tried to close tray but failed.\n");
					/* Ignore the error from the low
					level driver.  We don't care why it
					couldn't close the tray.  We only care 
					that there is no disc in the drive, 
					since that is the _REAL_ problem here.*/
					return -ENOMEDIUM;
				}
			} else {
				cd_dbg(CD_OPEN, "bummer. this driver can't close the tray.\n");
				return -ENOMEDIUM;
			}
			/* Ok, the door should be closed now.. Check again */
			ret = cdo->drive_status(cdi, CDSL_CURRENT);
			if ((ret == CDS_NO_DISC) || (ret==CDS_TRAY_OPEN)) {
				cd_dbg(CD_OPEN, "bummer. the tray is still not closed.\n");
				return -ENOMEDIUM;
			}	
			if (ret!=CDS_DISC_OK) {
				cd_dbg(CD_OPEN, "bummer. disc isn't ready.\n");
				return -EIO;
			}	
			cd_dbg(CD_OPEN, "the tray is now closed\n");
		}	
	}
	cdrom_count_tracks(cdi, &tracks);
	if (tracks.error) 
		return(tracks.error);

	if (tracks.audio==0)
		return -EMEDIUMTYPE;

	return 0;
}