/*
 * mon.C
 *
 *     On recupere a coups d'ioctl() des informations sur l'ecran attache'
 *     a la station.
 *
 *     D'apres /usr/include/sys/fbio.h:
 *
 *        struct mon_info 
 *        {
 *            u_long    mon_type;             -- bit array: defined above
 *            u_long    pixfreq;              -- pixel frequency in Hz
 *            u_long    hfreq;                -- horizontal freq in Hz
 *            u_long    vfreq;                -- vertical freq in Hz
 *            u_long    vsync;                -- vertical sync in scanlines
 *            u_long    hsync;                -- horizontal sync in pixels
 *                                            -- these are in pixel units
 *            u_short   hfporch;              -- horizontal front porch
 *            u_short   hbporch;              -- horizontal back porch
 *            u_short   vfporch;              -- vertical front porch
 *            u_short   vbporch;              -- vertical back porch
 *        };
 * 
 * Renaud Waldura * Tue Feb 21 19:40:18 1995
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <iostream.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/fbio.h>


ostream& operator << (ostream& os, const struct mon_info& mif)
{
    os << "bit array: " << mif.mon_type
       << "\npixel frequency: " << mif.pixfreq << " Hz"
       << "\nhorizontal frequency: " << mif.hfreq << " Hz"
       << "\nvertical frequency: " << mif.vfreq << " Hz"
       << "\nvertical sync: " << mif.vsync << " scanlines"
       << "\nhorizontal sync: " << mif.hsync << " pixels"
       << "\nhorizontal front porch: " << mif.hfporch << " pixels"
       << "\nhorizontal back porch: " << mif.hbporch << " pixels"
       << "\nvertical front porch: " << mif.vfporch << " pixels"
       << "\nvertical back porch: " << mif.vbporch << " pixels";
    return os;
}


const char* prog_name;


void errif (bool error)
{
    if (!error) return;
    perror(prog_name);
    exit(1);
}


main (int argc, const char* argv[])
{
    prog_name = argv[0];

    const char* dev_name = (argc == 2) ? argv[1] : "/dev/cgsix0";

    int cg = open(dev_name, O_RDONLY);
    errif(cg == -1);

    struct mon_info mif;
    errif( ioctl(cg, FBIOMONINFO, &mif) == -1 );

    cout << "Information on monitor attached to " << dev_name
	 << ": \n" << mif << endl;
    
    return 0;
}