void demo_scankey_main(void)
{
time_t t[2];
unsigned width, height, tick;
char c = 'X', scratch[16];
int key, x, y;
t[0] = t[1] = x = tick = 0;
memset(scratch, 0, 16);
y = 1;
sigatexit(tty_sigreset); // Make ctrl-c restore tty
tty_esc("?25l"); // hide cursor
tty_esc("0m"); // reset color to default
tty_esc("2J"); // Clear screen
xset_terminal(1, 1, 0, 0); // Raw mode
for (;;) {
tty_jump(x, y);
xputc(c);
t[1&++tick] = time(0);
if (t[0] != t[1]) terminal_probesize(&width, &height);
// Don't block first time through, to force header print
key = scan_key_getsize(scratch, -1*!!t[0], &width, &height);
tty_jump(0, 0);
printf("ESC to exit: ");
// Print unknown escape sequence
if (*scratch) {
printf("key=[ESC");
// Fetch rest of sequence after deviation, time gap determines end
while (0<(key = scan_key_getsize(scratch, 0, &width, &height)))
printf("%c", key);
printf("] ");
} else printf("key=%d ", key);
printf("x=%d y=%d width=%d height=%d\033[K", x, y, width, height);
fflush(0);
if (key == -2) continue;
if (key <= ' ') break;
if (key>=256) {
tty_jump(x, y);
xputc(' ');
key -= 256;
if (key==KEY_UP) y--;
else if (key==KEY_DOWN) y++;
else if (key==KEY_RIGHT) x++;
else if (key==KEY_LEFT) x--;
else if (key==KEY_PGUP) y = 0;
else if (key==KEY_PGDN) y = 999;
else if (key==KEY_HOME) x = 0;
else if (key==KEY_END) x = 999;
if (y<1) y = 1;
if (y>=height) y = height-1;
if (x<0) x = 0;
if (x>=width) x = width-1;
} else c = key;
}
tty_reset();
}
void tty_reset(void)
{
set_terminal(1, 0, 0);
tty_esc("?25h");
tty_esc("0m");
tty_jump(0, 999);
tty_esc("K");
}
void tty_jump(int x, int y)
{
char s[32];
sprintf(s, "%d;%dH", y+1, x+1);
tty_esc(s);
}