VPR Line Position Forward

Move the cursor down Pn lines, keeping its column. A 0 is taken as 1. The VT510 manual says that an attempt to move below the last line stops at the last line. It never scrolls.

It is a relative move, so origin mode makes no difference to it: the cursor moves Pn lines from wherever it is.

ECMA-48 names it for the data component, which a terminal does not have apart from its screen (§6, p. 14). Going up is VPB, and the absolute form is VPA. The VT510 manual’s one-line summary and “Parameters” entry for VPR are copying errors, as they are for VPA; the description beneath them is the right one.

Validation

VPR-1: One line by default

\e[1;2H
\e[e
X

|_____|
|_X___|
|_____|

VPR-2: n lines

\e[1;4H
\e[2e
X

|_____|
|_____|
|___X_|

VPR-3: Stops at the last line, without scrolling

A
\e[2;3H
\e[99e
X

|A____|
|_____|
|__X__|

VPR-4: The same in origin mode

\e[2;5r   # region is lines 2 to 5
\e[?69h   # allow left and right margins
\e[2;6s   # margins at columns 2 and 6
\e[?6h    # origin mode
\e[1;2H   # line 2, column 3 of the screen
X
\e[2e
Y
\e[?6l

|_______|
|__X____|
|_______|
|___Y___|
|_______|

The Y should be two lines below the cell after X, which is what esctest2’s test_VPR_IgnoresOriginMode checks. libghostty-vt puts it further down and further right. VPR there is setCursorPos(current line + 1 + Pn, current column + 1), and in origin mode setCursorPos adds the margins to both, so the move is offset by the top margin and the column by the left margin.