void flush_video()
{
clear_video();
char c = current_tty->buffer.text[0];
int vga_row = 0;
int vga_column = 0;
uint8_t color;
for (int i = 0; i < STDIO_SIZE && c != 0; i++) {
c = current_tty->buffer.text[i];
color = make_color(current_tty->buffer.fg[i], current_tty->bg);
switch (c) {
case '\n':
++vga_row;
vga_column = -1;
break;
case '\t':
for (int i = 0; i < current_tty->tabstop; ++i) {
tty_putentryat(' ', color, vga_column, vga_row);
vga_column++;
if (vga_column == 80) {
vga_row++;
vga_column = 0;
}
}
break;
case '\b':
--vga_column;
tty_putentryat(' ', color, vga_column, vga_row);
--vga_column;
break;
case '\a':
// no sound support yet
break;
default:
tty_putentryat(c, color, vga_column, vga_row);
break;
}
vga_column++;
if (vga_column == 80) {
vga_row++;
vga_column = 0;
}
if (tty_scroll(vga_row)) {
vga_row = 24;
vga_column = 0;
}
}
tty_move_cursor(vga_row, vga_column);
}
/* Do a line feed */
static void tty_new_line(tty_t t)
{
t->cursor_pos += CONSOLE_COLS - 1;
t->cursor_pos -= t->cursor_pos % CONSOLE_COLS;
/* Scroll when needed */
if(t->cursor_pos >= CONSOLE_COLS * CONSOLE_ROWS)
{
tty_scroll(t);
t->cursor_pos = (CONSOLE_COLS * CONSOLE_ROWS)
- CONSOLE_COLS;
}
/* Adjust cursor position */
tty_carrige_return(t);
}
void putchar(char c)
{
/* Prints a char */
switch (c)
{
case '\n':
putchar('\r');
++tty.y;
break;
case '\r':
tty.x = 0;
break;
case '\t':
tty.x += 4;
tty.x &= 0xfc; /* Remove the last 2 bits making it aligned by 4 */
break;
default:
if (isprint(c))
{
tty.buf[tty.y * SCR_WIDTH + tty.x] = c | (tty.attr << 8);
++tty.x;
}
break;
}
if (tty.x >= SCR_WIDTH)
{
tty.x = 0;
++tty.y;
}
if (tty.y >= SCR_HEIGHT)
{
tty.y = SCR_HEIGHT-1;
tty_scroll();
}
tty_move_cursor();
}
void tty_putc (char c)
{
const size_t idx = tty_row * VGA_WIDTH + tty_column;
switch (c)
{
case '\n': goto newline;
case '\r': goto linefeed;
case '\b': goto backspace;
default : goto print;
}
print:
tty_buffer[idx] = vga_entry(c, tty_color);
if (tty_column == VGA_WIDTH - 1)
goto newline;
else
tty_column++;
goto done;
newline:
tty_row++;
tty_scroll();
linefeed:
tty_column = 0;
goto done;
backspace:
if (tty_column != 0) tty_column--;
goto done;
done:
tty_updatecur();
return;
}
