int wdeleteln(WINDOW *win);
int insdelln(int n);
int winsdelln(WINDOW *win, int n);
int winsertln(WINDOW *win);
The deleteln and wdeleteln routines delete the line under the
cursor in the window; all lines below the current line are moved up one line.
The bottom line of the window is cleared. The cursor position does not change.
The insdelln and winsdelln 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.
All routines return the integer ERR upon failure and an OK (SVr4
specifies only "an integer value other than ERR") upon successful
Note that all but winsdelln may be macros.
These routines do not require a hardware line delete or insert feature in the
terminal. In fact, they will not use hardware line delete/insert unless
idlok(…, TRUE) has been set on the current window.