bool tty_open(struct TTY_t *tty)
{
if(tty == NULL)
return false;
tty_move_cursor(tty, 0, 0);
tty->enable = 1;
tty->echo = 1;
return true;
}
void tty_clear()
{
/* Resets the whole screen */
wmemset(tty.buf, ' ' | (0x07) << 8, SCR_SIZE * sizeof(u16));
/* Resets the cursor */
tty.x = tty.y = 0;
tty_move_cursor();
}
void tty_clear(struct TTY_t *tty)
{
int8_t x, y;
for(y = 0; y < TTY_HEIGHT; ++y) {
for(x = 0; x < TTY_WIDTH; ++x)
_V(x, y) = 0x0700;
}
tty_move_cursor(tty, 0, 0);
}
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);
}
size_t tty_read(struct TTY_t *tty, char *buf, size_t len)
{
size_t i = 0;
bool shift, caps, is_alpha, cont=true;
uint16_t scan_code, key;
if(!(tty->enable))
return 0;
while(i < len && cont) {
scan_code = pop_kbbuf(&KBBUF);
if(scan_code) {
key = KEYMAP[scan_code & 0xFF];
if((key & 0xFF) < 0xE0) {
shift = scan_code & (STATUS_SHIFT << 8);
caps = scan_code & (STATUS_CAPS << 8);
is_alpha = (key & 0xFF) >= 'a' && (key & 0xFF) <= 'z';
if((is_alpha && (shift ^ caps)) || (!is_alpha && shift && SHIFTMAP[key & 0xFF]))
buf[i] = SHIFTMAP[key & 0xFF];
else
buf[i] = key & 0xFF;
if(tty->echo)
tty_write(tty, buf + i, 1);
++i;
} else switch(key) {
case ENTER:
tty_write(tty, "\n", 1);
cont = false;
break;
case BACKSPACE:
if(tty->cur_x && i) {
buf[--i] = '\0';
if(tty->echo) {
tty_move_cursor(tty, tty->cur_x - 1, tty->cur_y);
_V(tty->cur_x, tty->cur_y) = 0x0700;
}
}
break;
}
} else {
wait_event(KEYBOARD);
}
}
buf[i] = '\0';
return i;
}
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();
}
size_t tty_write_with_color(struct TTY_t *tty, const char *buf, size_t len, uint8_t color)
{
cli();
const char *current = buf;
if(!(tty->enable))
return 0;
while(len--) {
if(*current != '\n')
_V(tty->cur_x, tty->cur_y) = (color << 8) | *current;
if(*current == '\n' || tty->cur_x == TTY_WIDTH) {
if(tty->cur_y + 1 == TTY_HEIGHT)
scoll_up(tty, 1);
else
++tty->cur_y;
tty->cur_x = 0;
} else {
++tty->cur_x;
}
++current;
}
tty_move_cursor(tty, tty->cur_x, tty->cur_y);
sti();
return current - buf;
}
