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.
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 successful
X/Open defines no error conditions. In this implementation, if the
window parameter is null, an error is returned.
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
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