deleteln, wdeleteln, insdelln, winsdelln,
insertln, winsertln - delete and insert lines in a curses
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.
int wdeleteln(WINDOW *win);
int insdelln(int n);
int winsdelln(WINDOW *win, int n);
int winsertln(WINDOW *win);
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.
The insertln and winsertln routines insert a blank
line above the current line and the bottom line is lost.
All routines return the integer ERR upon failure and an OK (SVr4
specifies only "an integer value other than ERR") upon
X/Open defines no error conditions. In this implementation, if the
window parameter is null, an error is returned.
These functions are described in the XSI Curses standard, Issue 4. The standard
specifies that they return ERR on failure, but specifies no error
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