# include <sys/types.h>
# include <sys/stat.h>
# include <fcntl.h>

# include <unistd.h>
# include <sys/mman.h>

# include <sys/ioctl.h>

# define BLIT(fd)        ioctl((fd), _IO('d', 0))
# define DISPLAY(fd, x)  ioctl((fd), _IOW('d', 1, int), (x))

int main(int argc, char *argv[])
{
  int fd;
  caddr_t dmap;

  fd = open("/dev/display", O_RDWR);
  if (fd == -1)
    return 1;

  dmap = mmap(0, 2048, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
  if (dmap == (caddr_t) -1)
    return 2;

  if (read(STDIN_FILENO, dmap, 2048) == -1)
    return -1;

  BLIT(fd);
  DISPLAY(fd, 1);

  if (munmap(dmap, 2048) == -1 ||
      close(fd) == -1)
    return 3;

  return 0;
}