void
tty_cursor(struct tty *tty, u_int cx, u_int cy, u_int ox, u_int oy)
{
if (ox + cx == 0 && tty->cx != 0 && tty->cy == oy + cy) {
tty->cx = 0;
tty_putc(tty, '\r');
} else if (tty->cx != ox + cx || tty->cy != oy + cy) {
tty->cx = ox + cx;
tty->cy = oy + cy;
tty_putcode2(tty, TTYC_CUP, tty->cy, tty->cx);
}
}
void
tty_region(struct tty *tty, u_int rupper, u_int rlower, u_int oy)
{
if (!tty_term_has(tty->term, TTYC_CSR))
return;
if (tty->rlower != oy + rlower || tty->rupper != oy + rupper) {
tty->rlower = oy + rlower;
tty->rupper = oy + rupper;
tty->cx = 0;
tty->cy = 0;
tty_putcode2(tty, TTYC_CSR, tty->rupper, tty->rlower);
}
}
/* Set region at absolute position. */
void
tty_region(struct tty *tty, u_int rupper, u_int rlower)
{
if (tty->rlower == rlower && tty->rupper == rupper)
return;
if (!tty_term_has(tty->term, TTYC_CSR))
return;
tty->rupper = rupper;
tty->rlower = rlower;
/*
* Some terminals (such as PuTTY) do not correctly reset the cursor to
* 0,0 if it is beyond the last column (they do not reset their wrap
* flag so further output causes a line feed). As a workaround, do an
* explicit move to 0 first.
*/
if (tty->cx >= tty->sx)
tty_cursor(tty, 0, tty->cy);
tty_putcode2(tty, TTYC_CSR, tty->rupper, tty->rlower);
tty_cursor(tty, 0, 0);
}
/* Move cursor to absolute position. */
void
tty_cursor(struct tty *tty, u_int cx, u_int cy)
{
struct tty_term *term = tty->term;
u_int thisx, thisy;
int change;
if (cx > tty->sx - 1)
cx = tty->sx - 1;
thisx = tty->cx;
thisy = tty->cy;
/* No change. */
if (cx == thisx && cy == thisy)
return;
/* Very end of the line, just use absolute movement. */
if (thisx > tty->sx - 1)
goto absolute;
/* Move to home position (0, 0). */
if (cx == 0 && cy == 0 && tty_term_has(term, TTYC_HOME)) {
tty_putcode(tty, TTYC_HOME);
goto out;
}
/* Zero on the next line. */
if (cx == 0 && cy == thisy + 1 && thisy != tty->rlower) {
tty_putc(tty, '\r');
tty_putc(tty, '\n');
goto out;
}
/* Moving column or row. */
if (cy == thisy) {
/*
* Moving column only, row staying the same.
*/
/* To left edge. */
if (cx == 0) {
tty_putc(tty, '\r');
goto out;
}
/* One to the left. */
if (cx == thisx - 1 && tty_term_has(term, TTYC_CUB1)) {
tty_putcode(tty, TTYC_CUB1);
goto out;
}
/* One to the right. */
if (cx == thisx + 1 && tty_term_has(term, TTYC_CUF1)) {
tty_putcode(tty, TTYC_CUF1);
goto out;
}
/* Calculate difference. */
change = thisx - cx; /* +ve left, -ve right */
/*
* Use HPA if change is larger than absolute, otherwise move
* the cursor with CUB/CUF.
*/
if ((u_int) abs(change) > cx && tty_term_has(term, TTYC_HPA)) {
tty_putcode1(tty, TTYC_HPA, cx);
goto out;
} else if (change > 0 && tty_term_has(term, TTYC_CUB)) {
tty_putcode1(tty, TTYC_CUB, change);
goto out;
} else if (change < 0 && tty_term_has(term, TTYC_CUF)) {
tty_putcode1(tty, TTYC_CUF, -change);
goto out;
}
} else if (cx == thisx) {
/*
* Moving row only, column staying the same.
*/
/* One above. */
if (thisy != tty->rupper &&
cy == thisy - 1 && tty_term_has(term, TTYC_CUU1)) {
tty_putcode(tty, TTYC_CUU1);
goto out;
}
/* One below. */
if (thisy != tty->rlower &&
cy == thisy + 1 && tty_term_has(term, TTYC_CUD1)) {
tty_putcode(tty, TTYC_CUD1);
goto out;
}
/* Calculate difference. */
change = thisy - cy; /* +ve up, -ve down */
/*
* Try to use VPA if change is larger than absolute or if this
* change would cross the scroll region, otherwise use CUU/CUD.
*/
if ((u_int) abs(change) > cy ||
(change < 0 && cy - change > tty->rlower) ||
(change > 0 && cy - change < tty->rupper)) {
if (tty_term_has(term, TTYC_VPA)) {
tty_putcode1(tty, TTYC_VPA, cy);
goto out;
}
} else if (change > 0 && tty_term_has(term, TTYC_CUU)) {
tty_putcode1(tty, TTYC_CUU, change);
goto out;
} else if (change < 0 && tty_term_has(term, TTYC_CUD)) {
tty_putcode1(tty, TTYC_CUD, -change);
goto out;
}
}
absolute:
/* Absolute movement. */
tty_putcode2(tty, TTYC_CUP, cy, cx);
out:
tty->cx = cx;
tty->cy = cy;
}
