const term_width: u16 = 20;
const term_height: u16 = 12;

static term_x: u16 = 0;
static term_y: u16 = 0;

static vcd: *u16 = 0x2000;

fn term_putc(ch: u16)
{
    if (ch == '\n')
        continue 'next_line;

    if (ch == '\0')
        continue 'next_col;
    if (ch == ' ')
        continue 'next_col;

    vcd[term_y * term_width + term_x] = ch;

'next_col:
    term_x += 1;
    if (term_x < term_width)
        return

'next_line:
    term_x = 0;

    if (term_y + 1 >= term_height) {
        term_scroll();
    } else {
        term_y += 1;
    }
}

fn term_scroll()
{
    for row: u16 in 0..term_height - 1 {
        for col: u16 in 0..term_width {

            vcd[row * term_width + col]
                = vcd[(row + 1) * term_width + col];
        }
    }
    for col: u16 in 0..term_width {
        vcd[(term_height - 1) * term_width + col] = ' ';
    }
}

// vim: syntax=rust