static void vgaterm_lf() {
vgaterm_cr();
if (!scrolling) {
for (uint16_t *p = screen + COLS; p < screen + SCREEN_SIZE; p++) {
*(p - COLS) = *p;
}
for (uint16_t *p = screen + SCREEN_SIZE - COLS; p < screen + SCREEN_SIZE; p++) {
*p = COLOR | SPACE;
}
}
scrollback_cursor = vga_scrollback_buffer + scrollback_end;
for (int i = 0; i < COLS; i++) *(scrollback_cursor + i) = SPACE;
if (scrollback_end == scrollback_start) {
scrollback_start += COLS;
if (scrollback_start == scrollback_lines * COLS) scrollback_start = 0;
if (scrolling) {
scrollback_top--;
if (scrollback_top < 0) scrollback_top = 0;
}
}
scrollback_end += COLS;
if (scrollback_end == scrollback_lines * COLS) scrollback_end = 0;
if (scrolling) {
scrollback_max++;
if (scrollback_max >= scrollback_lines - ROWS) scrollback_max = scrollback_lines - ROWS;
vgaterm_draw_scrollback();
}
vga_set_cursor(cursor - screen);
}
void vgaterm_write(char c) {
switch (c) {
case 10:
vgaterm_lf();
return;
default:
if (c >= 32) {
*scrollback_cursor++ = c;
if (scrolling) {
cursor++;
} else {
*cursor++ = COLOR | c;
}
if ((cursor - screen) % 80 == 0) vgaterm_lf();
vga_set_cursor(cursor - screen);
}
break;
}
}
// Disables the cursor
void vga_disable_cursor() {
if (cursor_enabled) {
vga_set_cursor(255, 255);
cursor_enabled = 0;
}
}
// Enables the cursor
void vga_enable_cursor() {
if (!cursor_enabled) {
cursor_enabled = 1;
vga_set_cursor(255, 255);
}
}
// Updates the cursor
void vga_update_cursor() {
vga_set_cursor(column, row);
}
