These functions insert or delete lines on
stdscr or on the specified window.
If
insdelln() is called with a positive number in
n, then the specified number of lines are inserted before the current line on
stdscr. The last
n lines of the screen are no longer displayed. If
n is negative, then
n lines are deleted from
stdscr, starting at the current line. The last
n lines of
stdscr are cleared.
The
winsdelln() function is the same as the
insdelln() function, excepting that lines are inserted or deleted from the window specified by
win.
If a scrolling region has been set with the
setscrreg() or
wsetscrreg() functions and the current cursor position is inside the scrolling region, then only the lines from the current line to the bottom of the scrolling region are affected.