src/Unix/sys_unix.cpp

/*
 *  sys_unix.cpp - System dependent routines, Unix implementation
 *
 *  Basilisk II (C) 1997-1999 Christian Bauer
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "sysdeps.h"

#include <sys/ioctl.h>
#include <sys/stat.h>
#include <errno.h>

#ifdef __linux__
#include <linux/cdrom.h>
#include <linux/fd.h>
#include <linux/major.h>
#include <linux/kdev_t.h>
#include <linux/unistd.h>

#ifdef __NR__llseek
_syscall5(int, _llseek, uint, fd, ulong, hi, ulong, lo, loff_t *, res, uint, wh);
#else
static int _llseek(uint fd, ulong hi, ulong lo, loff_t *res, uint wh)
{
        if (hi)
                return -1;
        *res = lseek(fd, lo, wh);
        if (*res == -1)
                return -1;
        return 0;
}
#endif
#endif

#ifdef __FreeBSD__
#include <sys/cdio.h>
#endif

#include "main.h"
#include "macos_util.h"
#include "prefs.h"
#include "user_strings.h"
#include "sys.h"

#define DEBUG 0
#include "debug.h"


// File handles are pointers to these structures
struct file_handle {
        char *name;             // Copy of device/file name
        int fd;
        bool is_file;           // Flag: plain file or /dev/something?
        bool is_floppy;         // Flag: floppy device
        bool is_cdrom;          // Flag: CD-ROM device
        bool read_only;         // Copy of Sys_open() flag
        loff_t start_byte;      // Size of file header (if any)
        loff_t file_size;       // Size of file data (only valid if is_file is true)

#if defined(__linux__)
        int cdrom_cap;          // CD-ROM capability flags (only valid if is_cdrom is true)
#elif defined(__FreeBSD__)
        struct ioc_capability cdrom_cap;
#endif
};

// File handle of first floppy drive (for SysMountFirstFloppy())
static file_handle *first_floppy = NULL;


/*
 *  Initialization
 */

void SysInit(void)
{
}


/*
 *  Deinitialization
 */

void SysExit(void)
{
}


/*
 *  Mount first floppy disk
 */

void SysMountFirstFloppy(void)
{
        if (first_floppy)
                MountVolume(first_floppy);
}


/*
 *  This gets called when no "floppy" prefs items are found
 *  It scans for available floppy drives and adds appropriate prefs items
 */

void SysAddFloppyPrefs(void)
{
#if defined(__linux__)
        PrefsAddString("floppy", "/dev/fd0H1440");
        PrefsAddString("floppy", "/dev/fd1H1440");
#else
        PrefsAddString("floppy", "/dev/fd0");
        PrefsAddString("floppy", "/dev/fd1");
#endif
}


/*
 *  This gets called when no "disk" prefs items are found
 *  It scans for available HFS volumes and adds appropriate prefs items
 */

void SysAddDiskPrefs(void)
{
#ifdef __linux__
        FILE *f = fopen("/etc/fstab", "r");
        if (f) {
                char line[256];
                while(fgets(line, 255, f)) {
                        // Read line
                        int len = strlen(line);
                        if (len == 0)
                                continue;
                        line[len-1] = 0;

                        // Parse line
                        char *dev, *mnt_point, *fstype;
                        if (sscanf(line, "%s %s %s", &dev, &mnt_point, &fstype) == 3) {
                                if (strcmp(fstype, "hfs") == 0)
                                        PrefsAddString("disk", dev);
                        }
                }
                fclose(f);
        }
#endif
}


/*
 *  This gets called when no "cdrom" prefs items are found
 *  It scans for available CD-ROM drives and adds appropriate prefs items
 */

void SysAddCDROMPrefs(void)
{
        // Don't scan for drives if nocdrom option given
        if (PrefsFindBool("nocdrom"))
                return;

#if defined(__linux__)
        PrefsAddString("cdrom", "/dev/cdrom");
#elif defined(__FreeBSD__)
        PrefsAddString("cdrom", "/dev/cd0c");
#endif
}


/*
 *  Add default serial prefs (must be added, even if no ports present)
 */

void SysAddSerialPrefs(void)
{
#if defined(__linux__)
        PrefsAddString("seriala", "/dev/ttyS0");
        PrefsAddString("serialb", "/dev/ttyS1");
#elif defined(__FreeBSD__)
        PrefsAddString("seriala", "/dev/cuaa0");
        PrefsAddString("serialb", "/dev/cuaa1");
#endif
}


/*
 *  Check if device is a mounted HFS volume, get mount name
 */

static bool is_drive_mounted(const char *dev_name, char *mount_name)
{
#ifdef __linux__
        FILE *f = fopen("/proc/mounts", "r");
        if (f) {
                char line[256];
                while(fgets(line, 255, f)) {
                        // Read line
                        int len = strlen(line);
                        if (len == 0)
                                continue;
                        line[len-1] = 0;

                        // Parse line
                        if (strncmp(line, dev_name, strlen(dev_name)) == 0) {
                                mount_name[0] = 0;
                                char dummy[256];
                                sscanf(line, "%s %s", dummy, mount_name);
                                fclose(f);
                                return true;
                        }
                }
                fclose(f);
        }
#endif
        return false;
}


/*
 *  Open file/device, create new file handle (returns NULL on error)
 */

void *Sys_open(const char *name, bool read_only)
{
        bool is_file = strncmp(name, "/dev/", 5) != 0;
#ifdef __FreeBSD__
                        // SCSI                             IDE
        bool is_cdrom = strncmp(name, "/dev/cd", 7) == 0 || strncmp(name, "/dev/acd", 8) == 0;
#else
        bool is_cdrom = strncmp(name, "/dev/cd", 7) == 0;
#endif

        D(bug("Sys_open(%s, %s)\n", name, read_only ? "read-only" : "read/write"));

        // Check if write access is allowed, set read-only flag if not
        if (!read_only && access(name, W_OK))
                read_only = true;

        // Print warning message and eventually unmount drive when this is an HFS volume mounted under Linux (double mounting will corrupt the volume)
        char mount_name[256];
        if (!is_file && !read_only && is_drive_mounted(name, mount_name)) {
                char str[512];
                sprintf(str, GetString(STR_VOLUME_IS_MOUNTED_WARN), mount_name);
                WarningAlert(str);
                sprintf(str, "umount %s", mount_name);
                if (system(str)) {
                        sprintf(str, GetString(STR_CANNOT_UNMOUNT_WARN), mount_name, strerror(errno));
                        WarningAlert(str);
                        return NULL;
                }
        }

        // Open file/device
#ifdef __linux__
        int fd = open(name, (read_only ? O_RDONLY : O_RDWR) | (is_cdrom ? O_NONBLOCK : 0));
#else
        int fd = open(name, read_only ? O_RDONLY : O_RDWR);
#endif
        if (fd < 0 && !read_only) {
                // Read-write failed, try read-only
                read_only = true;
                fd = open(name, O_RDONLY);
        }
        if (fd >= 0) {
                file_handle *fh = new file_handle;
                fh->name = strdup(name);
                fh->fd = fd;
                fh->is_file = is_file;
                fh->read_only = read_only;
                fh->start_byte = 0;
                fh->is_floppy = false;
                fh->is_cdrom = false;
                if (fh->is_file) {
                        // Detect disk image file layout
                        loff_t size = 0;
#ifdef __linux__
                        _llseek(fh->fd, 0, 0, &size, SEEK_END);
#else
                        size = lseek(fd, 0, SEEK_END);
#endif
                        uint8 data[256];
                        lseek(fd, 0, SEEK_SET);
                        read(fd, data, 256);
                        FileDiskLayout(size, data, fh->start_byte, fh->file_size);
                } else {
                        struct stat st;
                        if (fstat(fd, &st) == 0) {
                                if (S_ISBLK(st.st_mode)) {
                                        fh->is_cdrom = is_cdrom;
#if defined(__linux__)
                                        fh->is_floppy = (MAJOR(st.st_rdev) == FLOPPY_MAJOR);
#ifdef CDROM_GET_CAPABILITY
                                        if (is_cdrom) {
                                                fh->cdrom_cap = ioctl(fh->fd, CDROM_GET_CAPABILITY);
                                                if (fh->cdrom_cap < 0)
                                                        fh->cdrom_cap = 0;
                                        }
#else
                                        fh->cdrom_cap = 0;
#endif
#elif defined(__FreeBSD__)
                                        fh->is_floppy = ((st.st_rdev >> 16) == 2);
#ifdef CDIOCCAPABILITY
                                        if (is_cdrom) {
                                                if (ioctl(fh->fd, CDIOCCAPABILITY, &fh->cdrom_cap) < 0)
                                                        memset(&fh->cdrom_cap, 0, sizeof(fh->cdrom_cap));
                                        }
#else
                                        fh->cdrom_cap = 0;
#endif
#endif
                                }
                        }
                }
                if (fh->is_floppy && first_floppy == NULL)
                        first_floppy = fh;
                return fh;
        } else {
                printf("WARNING: Cannot open %s (%s)\n", name, strerror(errno));
                return NULL;
        }
}


/*
 *  Close file/device, delete file handle
 */

void Sys_close(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return;

        close(fh->fd);
        if (fh->name)
                free(fh->name);
        delete fh;
}


/*
 *  Read "length" bytes from file/device, starting at "offset", to "buffer",
 *  returns number of bytes read (or 0)
 */

size_t Sys_read(void *arg, void *buffer, loff_t offset, size_t length)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return 0;

        // Seek to position
#ifdef __linux__
        loff_t pos = offset + fh->start_byte, res;
        if (_llseek(fh->fd, pos >> 32, pos, &res, SEEK_SET) < 0)
                return 0;
#else
        if (lseek(fh->fd, offset + fh->start_byte, SEEK_SET) < 0)
                return 0;
#endif

        // Read data
        return read(fh->fd, buffer, length);
}


/*
 *  Write "length" bytes from "buffer" to file/device, starting at "offset",
 *  returns number of bytes written (or 0)
 */

size_t Sys_write(void *arg, void *buffer, loff_t offset, size_t length)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return 0;

        // Seek to position
#ifdef __linux__
        loff_t pos = offset + fh->start_byte, res;
        if (_llseek(fh->fd, pos >> 32, pos, &res, SEEK_SET) < 0)
                return 0;
#else
        if (lseek(fh->fd, offset + fh->start_byte, SEEK_SET) < 0)
                return 0;
#endif

        // Write data
        return write(fh->fd, buffer, length);
}


/*
 *  Return size of file/device (minus header)
 */

loff_t SysGetFileSize(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return true;

        if (fh->is_file)
                return fh->file_size;
        else {
#ifdef __linux__
                loff_t pos = 0;
                _llseek(fh->fd, 0, 0, &pos, SEEK_END);
                return pos - fh->start_byte;
#else
                return lseek(fh->fd, 0, SEEK_END) - fh->start_byte;
#endif
        }
}


/*
 *  Eject volume (if applicable)
 */

void SysEject(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return;

#if defined(__linux__)
        if (fh->is_floppy) {
                fsync(fh->fd);
                ioctl(fh->fd, FDFLUSH);
                ioctl(fh->fd, FDEJECT);
        } else if (fh->is_cdrom) {
                ioctl(fh->fd, CDROMEJECT);
                close(fh->fd);  // Close and reopen so the driver will see the media change
                fh->fd = open(fh->name, O_RDONLY | O_NONBLOCK);
        }
#elif defined(__FreeBSD__)
        if (fh->is_floppy) {
                fsync(fh->fd);
                //ioctl(fh->fd, FDFLUSH);
                //ioctl(fh->fd, FDEJECT);
        } else if (fh->is_cdrom) {
                ioctl(fh->fd, CDIOCEJECT);
                close(fh->fd);  // Close and reopen so the driver will see the media change
                fh->fd = open(fh->name, O_RDONLY | O_NONBLOCK);
        }
#endif
}


/*
 *  Format volume (if applicable)
 */

bool SysFormat(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return false;

        //!!
        return true;
}


/*
 *  Check if file/device is read-only (this includes the read-only flag on Sys_open())
 */

bool SysIsReadOnly(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return true;

#ifdef __linux__
        if (fh->is_floppy) {
                struct floppy_drive_struct stat;
                ioctl(fh->fd, FDGETDRVSTAT, &stat);
                return !(stat.flags & FD_DISK_WRITABLE);
        } else
#endif
                return fh->read_only;
}


/*
 *  Check if the given file handle refers to a fixed or a removable disk
 */

bool SysIsFixedDisk(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return true;

        if (fh->is_file)
                return true;
        else if (fh->is_floppy || fh->is_cdrom)
                return false;
        else
                return true;
}


/*
 *  Check if a disk is inserted in the drive (always true for files)
 */

bool SysIsDiskInserted(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return false;

        if (fh->is_file) {
                return true;

#if defined(__linux__)
        } else if (fh->is_floppy) {
                char block[512];
                lseek(fh->fd, 0, SEEK_SET);
                return read(fh->fd, block, 512) == 512;
        } else if (fh->is_cdrom) {
#ifdef CDROM_DRIVE_STATUS
                if (fh->cdrom_cap & CDC_DRIVE_STATUS) {
                        return ioctl(fh->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT) == CDS_DISC_OK;
                }
#endif
                cdrom_tochdr header;
                return ioctl(fh->fd, CDROMREADTOCHDR, &header) == 0;
#elif defined(__FreeBSD__)
        } else if (fh->is_floppy) {
                return false;   //!!
        } else if (fh->is_cdrom) {
                struct ioc_toc_header header;
                return ioctl(fh->fd, CDIOREADTOCHEADER, &header) == 0;
#endif

        } else
                return true;
}


/*
 *  Prevent medium removal (if applicable)
 */

void SysPreventRemoval(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return;

#if defined(__linux__) && defined(CDROM_LOCKDOOR)
        if (fh->is_cdrom)
                ioctl(fh->fd, CDROM_LOCKDOOR, 1);       
#endif
}


/*
 *  Allow medium removal (if applicable)
 */

void SysAllowRemoval(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return;

#ifdef defined(__linux__) && defined(CDROM_LOCKDOOR)
        if (fh->is_cdrom)
                ioctl(fh->fd, CDROM_LOCKDOOR, 0);       
#endif
}


/*
 *  Read CD-ROM TOC (binary MSF format, 804 bytes max.)
 */

bool SysCDReadTOC(void *arg, uint8 *toc)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return false;

        if (fh->is_cdrom) {
#if defined(__linux__)
                uint8 *p = toc + 2;

                // Header
                cdrom_tochdr header;
                if (ioctl(fh->fd, CDROMREADTOCHDR, &header) < 0)
                        return false;
                *p++ = header.cdth_trk0;
                *p++ = header.cdth_trk1;

                // Tracks
                cdrom_tocentry entry;
                for (int i=header.cdth_trk0; i<=header.cdth_trk1; i++) {
                        entry.cdte_track = i;
                        entry.cdte_format = CDROM_MSF;
                        if (ioctl(fh->fd, CDROMREADTOCENTRY, &entry) < 0)
                                return false;
                        *p++ = 0;
                        *p++ = (entry.cdte_adr << 4) | entry.cdte_ctrl;
                        *p++ = entry.cdte_track;
                        *p++ = 0;
                        *p++ = 0;
                        *p++ = entry.cdte_addr.msf.minute;
                        *p++ = entry.cdte_addr.msf.second;
                        *p++ = entry.cdte_addr.msf.frame;
                }

                // Leadout track
                entry.cdte_track = CDROM_LEADOUT;
                entry.cdte_format = CDROM_MSF;
                if (ioctl(fh->fd, CDROMREADTOCENTRY, &entry) < 0)
                        return false;
                *p++ = 0;
                *p++ = (entry.cdte_adr << 4) | entry.cdte_ctrl;
                *p++ = entry.cdte_track;
                *p++ = 0;
                *p++ = 0;
                *p++ = entry.cdte_addr.msf.minute;
                *p++ = entry.cdte_addr.msf.second;
                *p++ = entry.cdte_addr.msf.frame;

                // TOC size
                int toc_size = p - toc;
                *toc++ = toc_size >> 8;
                *toc++ = toc_size & 0xff;
                return true;
#elif defined(__FreeBSD__)
                uint8 *p = toc + 2;

                // Header
                struct ioc_toc_header header;
                if (ioctl(fh->fd, CDIOREADTOCHEADER, &header) < 0)
                        return false;
                *p++ = header.starting_track;
                *p++ = header.ending_track;

                // Tracks
                struct ioc_read_toc_single_entry entry;
                for (int i=header.starting_track; i<=header.ending_track; i++) {
                        entry.track = i;
                        entry.address_format = CD_MSF_FORMAT;
                        if (ioctl(fh->fd, CDIOREADTOCENTRY, &entry) < 0)
                                return false;
                        *p++ = 0;
                        *p++ = (entry.entry.addr_type << 4) | entry.entry.control;
                        *p++ = entry.entry.track;
                        *p++ = 0;
                        *p++ = 0;
                        *p++ = entry.entry.addr.msf.minute;
                        *p++ = entry.entry.addr.msf.second;
                        *p++ = entry.entry.addr.msf.frame;
                }

                // Leadout track
                entry.track = CD_TRACK_INFO;
                entry.address_format = CD_MSF_FORMAT;
                if (ioctl(fh->fd, CDIOREADTOCENTRY, &entry) < 0)
                        return false;
                *p++ = 0;
                *p++ = (entry.entry.addr_type << 4) | entry.entry.control;
                *p++ = entry.entry.track;
                *p++ = 0;
                *p++ = 0;
                *p++ = entry.entry.addr.msf.minute;
                *p++ = entry.entry.addr.msf.second;
                *p++ = entry.entry.addr.msf.frame;

                // TOC size
                int toc_size = p - toc;
                *toc++ = toc_size >> 8;
                *toc++ = toc_size & 0xff;
                return true;
#endif
        } else
                return false;
}


/*
 *  Read CD-ROM position data (Sub-Q Channel, 16 bytes, see SCSI standard)
 */

bool SysCDGetPosition(void *arg, uint8 *pos)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return false;

        if (fh->is_cdrom) {
#if defined(__linux__)
                cdrom_subchnl chan;
                chan.cdsc_format = CDROM_MSF;
                if (ioctl(fh->fd, CDROMSUBCHNL, &chan) < 0)
                        return false;
                *pos++ = 0;
                *pos++ = chan.cdsc_audiostatus;
                *pos++ = 0;
                *pos++ = 12;    // Sub-Q data length
                *pos++ = 0;
                *pos++ = (chan.cdsc_adr << 4) | chan.cdsc_ctrl;
                *pos++ = chan.cdsc_trk;
                *pos++ = chan.cdsc_ind;
                *pos++ = 0;
                *pos++ = chan.cdsc_absaddr.msf.minute;
                *pos++ = chan.cdsc_absaddr.msf.second;
                *pos++ = chan.cdsc_absaddr.msf.frame;
                *pos++ = 0;
                *pos++ = chan.cdsc_reladdr.msf.minute;
                *pos++ = chan.cdsc_reladdr.msf.second;
                *pos++ = chan.cdsc_reladdr.msf.frame;
                return true;
#elif defined(__FreeBSD__)
                struct ioc_read_subchannel chan;
                chan.data_format = CD_MSF_FORMAT;
                chan.address_format = CD_MSF_FORMAT;
                chan.track = CD_CURRENT_POSITION;
                if (ioctl(fh->fd, CDIOCREADSUBCHANNEL, &chan) < 0)
                        return false;
                *pos++ = 0;
                *pos++ = chan.data->header.audio_status;
                *pos++ = 0;
                *pos++ = 12;    // Sub-Q data length
                *pos++ = 0;
                *pos++ = (chan.data->what.position.addr_type << 4) | chan.data->what.position.control;
                *pos++ = chan.data->what.position.track_number;
                *pos++ = chan.data->what.position.index_number;
                *pos++ = 0;
                *pos++ = chan.data->what.position.absaddr.msf.minute;
                *pos++ = chan.data->what.position.absaddr.msf.second;
                *pos++ = chan.data->what.position.absaddr.msf.frame;
                *pos++ = 0;
                *pos++ = chan.data->what.position.reladdr.msf.minute;
                *pos++ = chan.data->what.position.reladdr.msf.second;
                *pos++ = chan.data->what.position.reladdr.msf.frame;
                return true;
#endif
        } else
                return false;
}


/*
 *  Play CD audio
 */

bool SysCDPlay(void *arg, uint8 start_m, uint8 start_s, uint8 start_f, uint8 end_m, uint8 end_s, uint8 end_f)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return false;

        if (fh->is_cdrom) {
#if defined(__linux__)
                cdrom_msf play;
                play.cdmsf_min0 = start_m;
                play.cdmsf_sec0 = start_s;
                play.cdmsf_frame0 = start_f;
                play.cdmsf_min1 = end_m;
                play.cdmsf_sec1 = end_s;
                play.cdmsf_frame1 = end_f;
                return ioctl(fh->fd, CDROMPLAYMSF, &play) == 0;
#elif defined(__FreeBSD__)
                struct ioc_play_msf play;
                play.start_m = start_m;
                play.start_s = start_s;
                play.start_f = start_f;
                play.end_m = end_m;
                play.end_s = end_s;
                play.end_f = end_f;
                return ioctl(fh->fd, CDIOCPLAYMSF, &play) == 0;
#endif
        } else
                return false;
}


/*
 *  Pause CD audio
 */

bool SysCDPause(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return false;

        if (fh->is_cdrom) {
#if defined(__linux__)
                return ioctl(fh->fd, CDROMPAUSE) == 0;
#elif defined(__FreeBSD__)
                return ioctl(fh->fd, CDIOCPAUSE) == 0;
#endif
        } else
                return false;
}


/*
 *  Resume paused CD audio
 */

bool SysCDResume(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return false;

        if (fh->is_cdrom) {
#if defined(__linux__)
                return ioctl(fh->fd, CDROMRESUME) == 0;
#elif defined(__FreeBSD__)
                return ioctl(fh->fd, CDIOCRESUME) == 0;
#endif
        } else
                return false;
}


/*
 *  Stop CD audio
 */

bool SysCDStop(void *arg, uint8 lead_out_m, uint8 lead_out_s, uint8 lead_out_f)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return false;

        if (fh->is_cdrom) {
#if defined(__linux__)
                return ioctl(fh->fd, CDROMSTOP) == 0;
#elif defined(__FreeBSD__)
                return ioctl(fh->fd, CDIOCSTOP) == 0;
#endif
        } else
                return false;
}


/*
 *  Perform CD audio fast-forward/fast-reverse operation starting from specified address
 */

bool SysCDScan(void *arg, uint8 start_m, uint8 start_s, uint8 start_f, bool reverse)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return false;

        // Not supported under Linux
        return false;
}


/*
 *  Set CD audio volume (0..255 each channel)
 */

void SysCDSetVolume(void *arg, uint8 left, uint8 right)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return;

        if (fh->is_cdrom) {
#if defined(__linux__)
                cdrom_volctrl vol;
                vol.channel0 = vol.channel2 = left;
                vol.channel1 = vol.channel3 = right;
                ioctl(fh->fd, CDROMVOLCTRL, &vol);
#elif defined(__FreeBSD__)
                struct ioc_vol vol;
                vol.vol[0] = vol.vol[2] = left;
                vol.vol[1] = vol.vol[3] = right;
                ioctl(fh->fd, CDIOCSETVOL, &vol);
#endif
        }
}


/*
 *  Get CD audio volume (0..255 each channel)
 */

void SysCDGetVolume(void *arg, uint8 &left, uint8 &right)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return;

        left = right = 0;
        if (fh->is_cdrom) {
#if defined(__linux__)
                cdrom_volctrl vol;
                ioctl(fh->fd, CDROMVOLREAD, &vol);
                left = vol.channel0;
                right = vol.channel1;
#elif defined(__FreeBSD__)
                struct ioc_vol vol;
                ioctl(fh->fd, CDIOCGETVOL, &vol);
                left = vol.vol[0];
                right = vol.vol[1];
#endif
        }
}
Revision:	1.1
Committed:	1999-10-03T14:16:25Z (25 years, 1 month ago) by cebix
Branch:	MAIN
Branch point for:	cebix
Log Message:	Initial revision