src/cdrom/qnx/SDL_syscdrom.c - third_party/sdl - Git at Google

 /*
     SDL - Simple DirectMedia Layer
     Copyright (C) 1997, 1998, 1999, 2000, 2001  Sam Lantinga

     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
     version 2 of the License, or (at your option) any later version.

     This library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Library General Public License for more details.

     You should have received a copy of the GNU Library General Public
     License along with this library; if not, write to the Free
     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

     Sam Lantinga
     slouken@libsdl.org
 */

 #ifdef SAVE_RCSID
 static char rcsid =
  "@(#) $Id$";
 #endif

 /* Functions for system-level CD-ROM audio control */

 #include <sys/types.h>
 #include <stdlib.h>
 #include <sys/stat.h>
 #include <sys/ioctl.h>
 #include <fcntl.h>
 #include <stdio.h>
 #include <string.h>
 #include <errno.h>
 #include <unistd.h>
 #include <sys/cdrom.h>
 #include <sys/dcmd_cam.h>


 #include "SDL_error.h"
 #include "SDL_cdrom.h"
 #include "SDL_syscdrom.h"


 /* The maximum number of CD-ROM drives we'll detect */
 #define MAX_DRIVES	16

 /* A list of available CD-ROM drives */
 static char *SDL_cdlist[MAX_DRIVES];
 static dev_t SDL_cdmode[MAX_DRIVES];

 /* The system-dependent CD control functions */
 static const char *SDL_SYS_CDName(int drive);
 static int SDL_SYS_CDOpen(int drive);
 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom);
 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position);
 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length);
 static int SDL_SYS_CDPause(SDL_CD *cdrom);
 static int SDL_SYS_CDResume(SDL_CD *cdrom);
 static int SDL_SYS_CDStop(SDL_CD *cdrom);
 static int SDL_SYS_CDEject(SDL_CD *cdrom);
 static void SDL_SYS_CDClose(SDL_CD *cdrom);

 /* Some ioctl() errno values which occur when the tray is empty */
 #define ERRNO_TRAYEMPTY(errno)	\
 	((errno == EIO) || (errno == ENOENT) || (errno == EINVAL))

 /* Check a drive to see if it is a CD-ROM */
 static int CheckDrive(char *drive, char *mnttype, struct stat *stbuf)
 {
 	int is_cd, cdfd;
 	cdrom_subch_data_t info;

 	/* If it doesn't exist, return -1 */
 	if ( stat(drive, stbuf) < 0 ) {
 		return(-1);
 	}

 	/* If it does exist, verify that it's an available CD-ROM */
 	is_cd = 0;
 	if ( S_ISCHR(stbuf->st_mode) || S_ISBLK(stbuf->st_mode) ) {
 		cdfd = open(drive, (O_RDONLY|O_EXCL|O_NONBLOCK), 0);
 		if ( cdfd >= 0 ) {
 			info.subch_command.data_format = CDROM_MSF;
 			/* Under Linux, EIO occurs when a disk is not present.
 			 */
 			if ((devctl(cdfd,DCMD_CAM_CDROMSUBCHNL,&info,sizeof(info),0) == 0) ||
 						ERRNO_TRAYEMPTY(errno) )
 			{
 				is_cd = 1;
 			}
 			close(cdfd);
 		}
 	}
 	return(is_cd);
 }

 /* Add a CD-ROM drive to our list of valid drives */
 static void AddDrive(char *drive, struct stat *stbuf)
 {
 	int i;

 	if ( SDL_numcds < MAX_DRIVES ) {
 		/* Check to make sure it's not already in our list.
 	 	   This can happen when we see a drive via symbolic link.
 		 */
 		for ( i=0; i<SDL_numcds; ++i ) {
 			if ( stbuf->st_rdev == SDL_cdmode[i] ) {
 #ifdef DEBUG_CDROM
   fprintf(stderr, "Duplicate drive detected: %s == %s\n", drive, SDL_cdlist[i]);
 #endif
 				return;
 			}
 		}

 		/* Add this drive to our list */
 		i = SDL_numcds;
 		SDL_cdlist[i] = (char *)malloc(strlen(drive)+1);
 		if ( SDL_cdlist[i] == NULL ) {
 			SDL_OutOfMemory();
 			return;
 		}
 		strcpy(SDL_cdlist[i], drive);
 		SDL_cdmode[i] = stbuf->st_rdev;
 		++SDL_numcds;
 #ifdef DEBUG_CDROM
   fprintf(stderr, "Added CD-ROM drive: %s\n", drive);
 #endif
 	}
 }

 int  SDL_SYS_CDInit(void)
 {
 	/* checklist: /dev/cdrom, /dev/hd?, /dev/scd? /dev/sr? */
 	static char *checklist[] = {
 		"cdrom", "?0 cd?", "?1 cd?", "?a hd?", "?0 scd?", "?0 sr?", NULL
 	};
 	char *SDLcdrom;
 	int i, j, exists;
 	char drive[32];
 	struct stat stbuf;

 	/* Fill in our driver capabilities */
 	SDL_CDcaps.Name = SDL_SYS_CDName;
 	SDL_CDcaps.Open = SDL_SYS_CDOpen;
 	SDL_CDcaps.GetTOC = SDL_SYS_CDGetTOC;
 	SDL_CDcaps.Status = SDL_SYS_CDStatus;
 	SDL_CDcaps.Play = SDL_SYS_CDPlay;
 	SDL_CDcaps.Pause = SDL_SYS_CDPause;
 	SDL_CDcaps.Resume = SDL_SYS_CDResume;
 	SDL_CDcaps.Stop = SDL_SYS_CDStop;
 	SDL_CDcaps.Eject = SDL_SYS_CDEject;
 	SDL_CDcaps.Close = SDL_SYS_CDClose;

 	/* Look in the environment for our CD-ROM drive list */
 	SDLcdrom = getenv("SDL_CDROM");	/* ':' separated list of devices */
 	if ( SDLcdrom != NULL ) {
 		char *cdpath, *delim;
 		cdpath = malloc(strlen(SDLcdrom)+1);
 		if ( cdpath != NULL ) {
 			strcpy(cdpath, SDLcdrom);
 			SDLcdrom = cdpath;
 			do {
 				delim = strchr(SDLcdrom, ':');
 				if ( delim ) {
 					*delim++ = '\0';
 				}
 #ifdef DEBUG_CDROM
   fprintf(stderr, "Checking CD-ROM drive from SDL_CDROM: %s\n", SDLcdrom);
 #endif
 				if ( CheckDrive(SDLcdrom, NULL, &stbuf) > 0 ) {
 					AddDrive(SDLcdrom, &stbuf);
 				}
 				if ( delim ) {
 					SDLcdrom = delim;
 				} else {
 					SDLcdrom = NULL;
 				}
 			} while ( SDLcdrom );
 			free(cdpath);
 		}

 		/* If we found our drives, there's nothing left to do */
 		if ( SDL_numcds > 0 ) {
 			return(0);
 		}
 	}

 	/* Scan the system for CD-ROM drives */
 	for ( i=0; checklist[i]; ++i ) {
 		if ( checklist[i][0] == '?' ) {
 			char *insert;
 			exists = 1;
 			for ( j=checklist[i][1]; exists; ++j ) {
 				sprintf(drive, "/dev/%s", &checklist[i][3]);
 				insert = strchr(drive, '?');
 				if ( insert != NULL ) {
 					*insert = j;
 				}
 #ifdef DEBUG_CDROM
   fprintf(stderr, "Checking possible CD-ROM drive: %s\n", drive);
 #endif
 				switch (CheckDrive(drive, NULL, &stbuf)) {
 					/* Drive exists and is a CD-ROM */
 					case 1:
 						AddDrive(drive, &stbuf);
 						break;
 					/* Drive exists, but isn't a CD-ROM */
 					case 0:
 						break;
 					/* Drive doesn't exist */
 					case -1:
 						exists = 0;
 						break;
 				}
 			}
 		} else {
 			sprintf(drive, "/dev/%s", checklist[i]);
 #ifdef DEBUG_CDROM
   fprintf(stderr, "Checking possible CD-ROM drive: %s\n", drive);
 #endif
 			if ( CheckDrive(drive, NULL, &stbuf) > 0 ) {
 				AddDrive(drive, &stbuf);
 			}
 		}
 	}
 	return(0);
 }

 static const char *SDL_SYS_CDName(int drive)
 {
 	return(SDL_cdlist[drive]);
 }

 static int SDL_SYS_CDOpen(int drive)
 {
 	return(open(SDL_cdlist[drive], (O_RDONLY|O_EXCL|O_NONBLOCK), 0));
 }

 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)
 {
 	cdrom_read_toc_t toc;
 	int i, okay;

 	okay = 0;
 	if (devctl(cdrom->id, DCMD_CAM_CDROMREADTOC, &toc, sizeof(toc), 0) == 0) {
 		cdrom->numtracks = toc.last_track - toc.first_track + 1;
 		if ( cdrom->numtracks > SDL_MAX_TRACKS ) {
 			cdrom->numtracks = SDL_MAX_TRACKS;
 		}
 		/* Read all the track TOC entries */
 		for ( i=0; i<=cdrom->numtracks; ++i ) {
 			if ( i == cdrom->numtracks ) {
 				cdrom->track[i].id = CDROM_LEADOUT;
 			} else {
 #if 0 /* Sam 11/6/00 - an obsolete field? */
 				cdrom->track[i].id = toc.cdth_trk0+i;
 #else
 				cdrom->track[i].id = toc.first_track+i;
 #endif
 			}
 			cdrom->track[i].type = toc.toc_entry[i].control_adr;
 			cdrom->track[i].offset = MSF_TO_FRAMES(
 						toc.toc_entry[i].addr.msf.minute,
 						toc.toc_entry[i].addr.msf.second,
 						toc.toc_entry[i].addr.msf.frame);
 			cdrom->track[i].length = 0;
 			if ( i > 0 ) {
 				cdrom->track[i-1].length =
 					cdrom->track[i].offset-
 					cdrom->track[i-1].offset;
 			}
 		}
 		if ( i == (cdrom->numtracks+1) ) {
 			okay = 1;
 		}
 	}
 	return(okay ? 0 : -1);
 }

 /* Get CD-ROM status */
 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position)
 {
 	CDstatus status;
 	cdrom_read_toc_t toc;
 	subch_current_position_t info;

 #if 0 /* Sam 11/6/00 - an obsolete field? */
 	info.subch_command.data_format = CDROM_SUBCH_CURRENT_POSITION;
 	info.subch_command.track_number = 0;
 #else
 	info.data_format = CDROM_SUBCH_CURRENT_POSITION;
 	info.track_number = 0;
 #endif
 	if (devctl(cdrom->id, DCMD_CAM_CDROMSUBCHNL, &info, sizeof(info), 0) != 0) {
 		if ( ERRNO_TRAYEMPTY(errno) ) {
 			status = CD_TRAYEMPTY;
 		} else {
 			status = CD_ERROR;
 		}
 	} else {
 		switch (info.header.audio_status) {
 			case CDROM_AUDIO_INVALID:
 			case CDROM_AUDIO_NO_STATUS:
 				/* Try to determine if there's a CD available */
 				if (devctl(cdrom->id, DCMD_CAM_CDROMREADTOC, &toc, sizeof(toc), 0)==0)
 					status = CD_STOPPED;
 				else
 					status = CD_TRAYEMPTY;
 				break;
 			case CDROM_AUDIO_COMPLETED:
 				status = CD_STOPPED;
 				break;
 			case CDROM_AUDIO_PLAY:
 				status = CD_PLAYING;
 				break;
 			case CDROM_AUDIO_PAUSED:
 				/* Workaround buggy CD-ROM drive */
 				if ( info.data_format == CDROM_LEADOUT ) {
 					status = CD_STOPPED;
 				} else {
 					status = CD_PAUSED;
 				}
 				break;
 			default:
 				status = CD_ERROR;
 				break;
 		}
 	}
 	if ( position ) {
 		if ( status == CD_PLAYING || (status == CD_PAUSED) ) {
 			*position = MSF_TO_FRAMES(
 					info.addr.msf.minute,
 					info.addr.msf.second,
 					info.addr.msf.frame);
 		} else {
 			*position = 0;
 		}
 	}
 	return(status);
 }

 /* Start play */
 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)
 {
 	cdrom_playmsf_t playtime;

 	FRAMES_TO_MSF(start,
 	   &playtime.start_minute, &playtime.start_second, &playtime.start_frame);
 	FRAMES_TO_MSF(start+length,
 	   &playtime.end_minute, &playtime.end_second, &playtime.end_frame);
 #ifdef DEBUG_CDROM
   fprintf(stderr, "Trying to play from %d:%d:%d to %d:%d:%d\n",
 	playtime.start_minute, playtime.start_second, playtime.start_frame,
 	playtime.end_minute, playtime.end_second, playtime.end_frame);
 #endif
 	return(devctl(cdrom->id, DCMD_CAM_CDROMPLAYMSF, &playtime, sizeof(playtime), 0));
 }

 /* Pause play */
 static int SDL_SYS_CDPause(SDL_CD *cdrom)
 {
 	return(devctl(cdrom->id, DCMD_CAM_CDROMPAUSE, NULL, 0, 0));
 }

 /* Resume play */
 static int SDL_SYS_CDResume(SDL_CD *cdrom)
 {
 	return(devctl(cdrom->id, DCMD_CAM_CDROMRESUME, NULL, 0, 0));
 }

 /* Stop play */
 static int SDL_SYS_CDStop(SDL_CD *cdrom)
 {
 	return(devctl(cdrom->id, DCMD_CAM_CDROMSTOP, NULL, 0, 0));
 }

 /* Eject the CD-ROM */
 static int SDL_SYS_CDEject(SDL_CD *cdrom)
 {
 	return(devctl(cdrom->id, DCMD_CAM_EJECT_MEDIA, NULL, 0, 0));
 }

 /* Close the CD-ROM handle */
 static void SDL_SYS_CDClose(SDL_CD *cdrom)
 {
 	close(cdrom->id);
 }

 void SDL_SYS_CDQuit(void)
 {
 	int i;

 	if ( SDL_numcds > 0 ) {
 		for ( i=0; i<SDL_numcds; ++i ) {
 			free(SDL_cdlist[i]);
 		}
 		SDL_numcds = 0;
 	}
 }
	/*
	SDL - Simple DirectMedia Layer
	Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga

	This library is free software; you can redistribute it and/or
	modify it under the terms of the GNU Library General Public
	License as published by the Free Software Foundation; either
	version 2 of the License, or (at your option) any later version.

	This library is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	Library General Public License for more details.

	You should have received a copy of the GNU Library General Public
	License along with this library; if not, write to the Free
	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

	Sam Lantinga
	slouken@libsdl.org
	*/

	#ifdef SAVE_RCSID
	static char rcsid =
	"@(#) $Id$";
	#endif

	/* Functions for system-level CD-ROM audio control */

	#include <sys/types.h>
	#include <stdlib.h>
	#include <sys/stat.h>
	#include <sys/ioctl.h>
	#include <fcntl.h>
	#include <stdio.h>
	#include <string.h>
	#include <errno.h>
	#include <unistd.h>
	#include <sys/cdrom.h>
	#include <sys/dcmd_cam.h>


	#include "SDL_error.h"
	#include "SDL_cdrom.h"
	#include "SDL_syscdrom.h"


	/* The maximum number of CD-ROM drives we'll detect */
	#define MAX_DRIVES 16

	/* A list of available CD-ROM drives */
	static char *SDL_cdlist[MAX_DRIVES];
	static dev_t SDL_cdmode[MAX_DRIVES];

	/* The system-dependent CD control functions */
	static const char *SDL_SYS_CDName(int drive);
	static int SDL_SYS_CDOpen(int drive);
	static int SDL_SYS_CDGetTOC(SDL_CD *cdrom);
	static CDstatus SDL_SYS_CDStatus(SDL_CD cdrom, int position);
	static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length);
	static int SDL_SYS_CDPause(SDL_CD *cdrom);
	static int SDL_SYS_CDResume(SDL_CD *cdrom);
	static int SDL_SYS_CDStop(SDL_CD *cdrom);
	static int SDL_SYS_CDEject(SDL_CD *cdrom);
	static void SDL_SYS_CDClose(SDL_CD *cdrom);

	/* Some ioctl() errno values which occur when the tray is empty */
	#define ERRNO_TRAYEMPTY(errno) \
	((errno == EIO) \|\| (errno == ENOENT) \|\| (errno == EINVAL))

	/* Check a drive to see if it is a CD-ROM */
	static int CheckDrive(char drive, char mnttype, struct stat *stbuf)
	{
	int is_cd, cdfd;
	cdrom_subch_data_t info;

	/* If it doesn't exist, return -1 */
	if ( stat(drive, stbuf) < 0 ) {
	return(-1);
	}

	/* If it does exist, verify that it's an available CD-ROM */
	is_cd = 0;
	if ( S_ISCHR(stbuf->st_mode) \|\| S_ISBLK(stbuf->st_mode) ) {
	cdfd = open(drive, (O_RDONLY\|O_EXCL\|O_NONBLOCK), 0);
	if ( cdfd >= 0 ) {
	info.subch_command.data_format = CDROM_MSF;
	/* Under Linux, EIO occurs when a disk is not present.
	*/
	if ((devctl(cdfd,DCMD_CAM_CDROMSUBCHNL,&info,sizeof(info),0) == 0) \|\|
	ERRNO_TRAYEMPTY(errno) )
	{
	is_cd = 1;
	}
	close(cdfd);
	}
	}
	return(is_cd);
	}

	/* Add a CD-ROM drive to our list of valid drives */
	static void AddDrive(char drive, struct stat stbuf)
	{
	int i;

	if ( SDL_numcds < MAX_DRIVES ) {
	/* Check to make sure it's not already in our list.
	This can happen when we see a drive via symbolic link.
	*/
	for ( i=0; i<SDL_numcds; ++i ) {
	if ( stbuf->st_rdev == SDL_cdmode[i] ) {
	#ifdef DEBUG_CDROM
	fprintf(stderr, "Duplicate drive detected: %s == %s\n", drive, SDL_cdlist[i]);
	#endif
	return;
	}
	}

	/* Add this drive to our list */
	i = SDL_numcds;
	SDL_cdlist[i] = (char *)malloc(strlen(drive)+1);
	if ( SDL_cdlist[i] == NULL ) {
	SDL_OutOfMemory();
	return;
	}
	strcpy(SDL_cdlist[i], drive);
	SDL_cdmode[i] = stbuf->st_rdev;
	++SDL_numcds;
	#ifdef DEBUG_CDROM
	fprintf(stderr, "Added CD-ROM drive: %s\n", drive);
	#endif
	}
	}

	int SDL_SYS_CDInit(void)
	{
	/* checklist: /dev/cdrom, /dev/hd?, /dev/scd? /dev/sr? */
	static char *checklist[] = {
	"cdrom", "?0 cd?", "?1 cd?", "?a hd?", "?0 scd?", "?0 sr?", NULL
	};
	char *SDLcdrom;
	int i, j, exists;
	char drive[32];
	struct stat stbuf;

	/* Fill in our driver capabilities */
	SDL_CDcaps.Name = SDL_SYS_CDName;
	SDL_CDcaps.Open = SDL_SYS_CDOpen;
	SDL_CDcaps.GetTOC = SDL_SYS_CDGetTOC;
	SDL_CDcaps.Status = SDL_SYS_CDStatus;
	SDL_CDcaps.Play = SDL_SYS_CDPlay;
	SDL_CDcaps.Pause = SDL_SYS_CDPause;
	SDL_CDcaps.Resume = SDL_SYS_CDResume;
	SDL_CDcaps.Stop = SDL_SYS_CDStop;
	SDL_CDcaps.Eject = SDL_SYS_CDEject;
	SDL_CDcaps.Close = SDL_SYS_CDClose;

	/* Look in the environment for our CD-ROM drive list */
	SDLcdrom = getenv("SDL_CDROM"); /* ':' separated list of devices */
	if ( SDLcdrom != NULL ) {
	char cdpath, delim;
	cdpath = malloc(strlen(SDLcdrom)+1);
	if ( cdpath != NULL ) {
	strcpy(cdpath, SDLcdrom);
	SDLcdrom = cdpath;
	do {
	delim = strchr(SDLcdrom, ':');
	if ( delim ) {
	*delim++ = '\0';
	}
	#ifdef DEBUG_CDROM
	fprintf(stderr, "Checking CD-ROM drive from SDL_CDROM: %s\n", SDLcdrom);
	#endif
	if ( CheckDrive(SDLcdrom, NULL, &stbuf) > 0 ) {
	AddDrive(SDLcdrom, &stbuf);
	}
	if ( delim ) {
	SDLcdrom = delim;
	} else {
	SDLcdrom = NULL;
	}
	} while ( SDLcdrom );
	free(cdpath);
	}

	/* If we found our drives, there's nothing left to do */
	if ( SDL_numcds > 0 ) {
	return(0);
	}
	}

	/* Scan the system for CD-ROM drives */
	for ( i=0; checklist[i]; ++i ) {
	if ( checklist[i][0] == '?' ) {
	char *insert;
	exists = 1;
	for ( j=checklist[i][1]; exists; ++j ) {
	sprintf(drive, "/dev/%s", &checklist[i][3]);
	insert = strchr(drive, '?');
	if ( insert != NULL ) {
	*insert = j;
	}
	#ifdef DEBUG_CDROM
	fprintf(stderr, "Checking possible CD-ROM drive: %s\n", drive);
	#endif
	switch (CheckDrive(drive, NULL, &stbuf)) {
	/* Drive exists and is a CD-ROM */
	case 1:
	AddDrive(drive, &stbuf);
	break;
	/* Drive exists, but isn't a CD-ROM */
	case 0:
	break;
	/* Drive doesn't exist */
	case -1:
	exists = 0;
	break;
	}
	}
	} else {
	sprintf(drive, "/dev/%s", checklist[i]);
	#ifdef DEBUG_CDROM
	fprintf(stderr, "Checking possible CD-ROM drive: %s\n", drive);
	#endif
	if ( CheckDrive(drive, NULL, &stbuf) > 0 ) {
	AddDrive(drive, &stbuf);
	}
	}
	}
	return(0);
	}

	static const char *SDL_SYS_CDName(int drive)
	{
	return(SDL_cdlist[drive]);
	}

	static int SDL_SYS_CDOpen(int drive)
	{
	return(open(SDL_cdlist[drive], (O_RDONLY\|O_EXCL\|O_NONBLOCK), 0));
	}

	static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)
	{
	cdrom_read_toc_t toc;
	int i, okay;

	okay = 0;
	if (devctl(cdrom->id, DCMD_CAM_CDROMREADTOC, &toc, sizeof(toc), 0) == 0) {
	cdrom->numtracks = toc.last_track - toc.first_track + 1;
	if ( cdrom->numtracks > SDL_MAX_TRACKS ) {
	cdrom->numtracks = SDL_MAX_TRACKS;
	}
	/* Read all the track TOC entries */
	for ( i=0; i<=cdrom->numtracks; ++i ) {
	if ( i == cdrom->numtracks ) {
	cdrom->track[i].id = CDROM_LEADOUT;
	} else {
	#if 0 /* Sam 11/6/00 - an obsolete field? */
	cdrom->track[i].id = toc.cdth_trk0+i;
	#else
	cdrom->track[i].id = toc.first_track+i;
	#endif
	}
	cdrom->track[i].type = toc.toc_entry[i].control_adr;
	cdrom->track[i].offset = MSF_TO_FRAMES(
	toc.toc_entry[i].addr.msf.minute,
	toc.toc_entry[i].addr.msf.second,
	toc.toc_entry[i].addr.msf.frame);
	cdrom->track[i].length = 0;
	if ( i > 0 ) {
	cdrom->track[i-1].length =
	cdrom->track[i].offset-
	cdrom->track[i-1].offset;
	}
	}
	if ( i == (cdrom->numtracks+1) ) {
	okay = 1;
	}
	}
	return(okay ? 0 : -1);
	}

	/* Get CD-ROM status */
	static CDstatus SDL_SYS_CDStatus(SDL_CD cdrom, int position)
	{
	CDstatus status;
	cdrom_read_toc_t toc;
	subch_current_position_t info;

	#if 0 /* Sam 11/6/00 - an obsolete field? */
	info.subch_command.data_format = CDROM_SUBCH_CURRENT_POSITION;
	info.subch_command.track_number = 0;
	#else
	info.data_format = CDROM_SUBCH_CURRENT_POSITION;
	info.track_number = 0;
	#endif
	if (devctl(cdrom->id, DCMD_CAM_CDROMSUBCHNL, &info, sizeof(info), 0) != 0) {
	if ( ERRNO_TRAYEMPTY(errno) ) {
	status = CD_TRAYEMPTY;
	} else {
	status = CD_ERROR;
	}
	} else {
	switch (info.header.audio_status) {
	case CDROM_AUDIO_INVALID:
	case CDROM_AUDIO_NO_STATUS:
	/* Try to determine if there's a CD available */
	if (devctl(cdrom->id, DCMD_CAM_CDROMREADTOC, &toc, sizeof(toc), 0)==0)
	status = CD_STOPPED;
	else
	status = CD_TRAYEMPTY;
	break;
	case CDROM_AUDIO_COMPLETED:
	status = CD_STOPPED;
	break;
	case CDROM_AUDIO_PLAY:
	status = CD_PLAYING;
	break;
	case CDROM_AUDIO_PAUSED:
	/* Workaround buggy CD-ROM drive */
	if ( info.data_format == CDROM_LEADOUT ) {
	status = CD_STOPPED;
	} else {
	status = CD_PAUSED;
	}
	break;
	default:
	status = CD_ERROR;
	break;
	}
	}
	if ( position ) {
	if ( status == CD_PLAYING \|\| (status == CD_PAUSED) ) {
	*position = MSF_TO_FRAMES(
	info.addr.msf.minute,
	info.addr.msf.second,
	info.addr.msf.frame);
	} else {
	*position = 0;
	}
	}
	return(status);
	}

	/* Start play */
	static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)
	{
	cdrom_playmsf_t playtime;

	FRAMES_TO_MSF(start,
	&playtime.start_minute, &playtime.start_second, &playtime.start_frame);
	FRAMES_TO_MSF(start+length,
	&playtime.end_minute, &playtime.end_second, &playtime.end_frame);
	#ifdef DEBUG_CDROM
	fprintf(stderr, "Trying to play from %d:%d:%d to %d:%d:%d\n",
	playtime.start_minute, playtime.start_second, playtime.start_frame,
	playtime.end_minute, playtime.end_second, playtime.end_frame);
	#endif
	return(devctl(cdrom->id, DCMD_CAM_CDROMPLAYMSF, &playtime, sizeof(playtime), 0));
	}

	/* Pause play */
	static int SDL_SYS_CDPause(SDL_CD *cdrom)
	{
	return(devctl(cdrom->id, DCMD_CAM_CDROMPAUSE, NULL, 0, 0));
	}

	/* Resume play */
	static int SDL_SYS_CDResume(SDL_CD *cdrom)
	{
	return(devctl(cdrom->id, DCMD_CAM_CDROMRESUME, NULL, 0, 0));
	}

	/* Stop play */
	static int SDL_SYS_CDStop(SDL_CD *cdrom)
	{
	return(devctl(cdrom->id, DCMD_CAM_CDROMSTOP, NULL, 0, 0));
	}

	/* Eject the CD-ROM */
	static int SDL_SYS_CDEject(SDL_CD *cdrom)
	{
	return(devctl(cdrom->id, DCMD_CAM_EJECT_MEDIA, NULL, 0, 0));
	}

	/* Close the CD-ROM handle */
	static void SDL_SYS_CDClose(SDL_CD *cdrom)
	{
	close(cdrom->id);
	}

	void SDL_SYS_CDQuit(void)
	{
	int i;

	if ( SDL_numcds > 0 ) {
	for ( i=0; i<SDL_numcds; ++i ) {
	free(SDL_cdlist[i]);
	}
	SDL_numcds = 0;
	}
	}