#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <linux/cdrom.h>

const char* program_name;

static inline void die(int code, const char* message, int fd){
    if(fd != -1) close(fd);
    fprintf(stderr, "%s: %s\n", program_name, message);
    exit(code);
}

static inline void print_usage(){
    printf("Usage: %s [-h]\n\t-h\tdisplays this help message.\n\t\
            Calling the program with no arguments will read the \
            table of contents of the CD lying in the tray.", program_name);
    die(127);
}

int main(int argc, char** argv){
    register int fd;
    register unsigned char i;
    struct cdrom_tochdr toc_hdr;
    struct cdrom_tocentry toc_entry;

    if(!argv) die(127, "How did you do that? No argv?", -1);
    program_name = argv[0];

    if(argc > 1) print_usage();

    if((fd = open("/dev/cdrom", O_RDONLY)) == -1){
        if(errno == ENOMEDIUM)
            die(127, "No CD in drive", fd);
        else
            die(127, "Cannot open /dev/cdrom", fd);
    }

    if(ioctl(fd, CDROMREADTOCHDR, &toc_hdr) == -1)
        die(127, "Cannot get header", fd);

    printf("First track: %d\nLast track: %d\n\n trackno) length\n", 
            toc_hdr.cdth_trk0, toc_hdr.cdth_trk1);

    for(i = toc_hdr.cdth_trk0; i <= toc_hdr.cdth_trk1; i++){
        toc_entry.cdte_track = i;
        toc_entry.cdte_format = CDROM_MSF;
        
        if(ioctl(fd, CDROMREADTOCENTRY, &toc_entry) == -1)
            die(127, "Cannot get table of contents", fd);

        printf(" %2d)\t%02d:%02d.%02d\n", i, toc_entry.cdte_addr.msf.minute,
                toc_entry.cdte_addr.msf.second, 
                (toc_entry.cdte_addr.msf.frame*100+27)/75);
    }
        
    close(fd);
    return 0;
}