/*
 * change kernel terminal size.
 */
static void
change_term_size (int fd, int x, int y)
{
#ifdef TIOCGSIZE
    struct ttysize win;

#elif defined(TIOCGWINSZ)
    struct winsize win;

#endif

#ifdef TIOCGSIZE
    if (ioctl (fd, TIOCGSIZE, &win))
        return;
    if (y && y>24)
        win.ts_lines = y;
    else
        win.ts_lines = 24;
    if (x && x>80)
        win.ts_cols = x;
    else
        win.ts_cols = 80;
    ioctl (fd, TIOCSSIZE, &win);
#elif defined TIOCGWINSZ
    if (ioctl (fd, TIOCGWINSZ, &win))
        return;
    if (y && y >24)
        win.ws_row = y;
    else
        win.ws_row = 24;
    if (x && x>80)
        win.ws_col = x;
    else
        win.ws_col = 80;
    ioctl (fd, TIOCSWINSZ, &win);
#endif
}

/*
 * inquire actual terminal size (this it what the 
 * kernel thinks - not was the user on the over end
 * of the phone line has really).
 */
static int
get_term_size (int fd, int *x, int *y)
{
#ifdef TIOCGSIZE
    struct ttysize win;

#elif defined(TIOCGWINSZ)
    struct winsize win;

#endif

#ifdef TIOCGSIZE
    if (ioctl (fd, TIOCGSIZE, &win))
        return 0;
    if (y)
        *y=win.ts_lines;
    if (x)
        *x=win.ts_cols;
#elif defined TIOCGWINSZ
    if (ioctl (fd, TIOCGWINSZ, &win))
        return 0;
    if (y)
        *y=win.ws_row;
    if (x)
        *x=win.ws_col;
#else
    {
        const char *s;
        s=getenv("LINES");
        if (s)
            *y=strtol(s,NULL,10);
        else
            *y=25;
        s=getenv("COLUMNS");
        if (s)
            *x=strtol(s,NULL,10);
        else
            *x=80;
    }
#endif
    return 1;
}