size_t tty_read(char *buf, size_t len) {
enable_interrupt();
size_t i = 0;
while (i != len) {
uint16_t scan_code;
while (!cirqueue_serve(&kb_buf, &scan_code))
/*nothing here*/;
uint16_t key = KEYMAP[scan_code & 0xff];
if ((scan_code & 0xFF) < 0xE0) { /* it's a normal key */
if (key == KB_ENTER) {
tty_putchar('\n');
break;
} else if (key == KB_BACKSPACE) {
if (i != 0) {
tty_putchar('\b');
i -= 1;
}
} else {
buf[i] = key & 0xFF;
tty_putchar(buf[i]);
i += 1;
}
} else { /* extended key */
}
}
buf[i] = '\0';
return i;
}
void tty_putchar_ntimes(char c, uint8_t color, size_t n) {
uint8_t ori_color = tty_color;
tty_color = color;
for (size_t i = 0; i < n; ++i)
tty_putchar(c);
tty_color = ori_color;
}
_START static void tty_clear_row(int row)
{
int col = 0;
for (col = 0; col < TTY_MAX_COL; col++)
tty_putchar(row, col, ' ');
}
_START static void tty_copy_row(int src, int dst)
{
int col = 0;
for (col = 0; col < TTY_MAX_COL; col++)
tty_putchar(dst, col, tty_getchar(src, col));
}
_START void tty_init(void)
{
int i = 0;
int j = 0;
for (i = 0; i < TTY_MAX_ROW; i++){
for (j = 0; j < TTY_MAX_COL; j++){
tty_setcolor(i, j, clWhite, clBlack);
tty_putchar(i, j, ' ');
}
}
}
void tty_write(const char *data, size_t size) {
for (size_t i = 0; i < size; ++i)
tty_putchar(data[i]);
}
