int deleteln(void); int wdeleteln(WINDOW *win); int insdelln(int n); int winsdelln(WINDOW *win, int n); int insertln(void); int winsertln(WINDOW *win);
The insdelln(3) and winsdelln(3) routines, for positive n, insert n lines into the specified window above the current line. The n bottom lines are lost. For negative n, delete n lines (starting with the one under the cursor), and move the remaining lines up. The bottom n lines are cleared. The current cursor position remains the same.
The insertln(3) and insertln(3) routines, insert a blank line above the current line and the bottom line is lost.
These routines do not require a hardware line delete or insert feature in the terminal. In fact, they won't use hardware line delete/insert unless
has been set on the current window.