.\"	$NetBSD: curses_insdelln.3,v 1.3 2003/04/16 13:35:01 wiz Exp $
.\"
.\" Copyright (c) 2002
.\"	Brett Lymn (blymn@NetBSD.org, brett_lymn@yahoo.com.au)
.\"
.\" This code is donated to the NetBSD Foundation by the Author.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
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.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 3. The name of the Author may not be used to endorse or promote
.\"    products derived from this software without specific prior written
.\"    permission.
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.Dd August 12, 2002
.Dt CURSES_INSDEL 3
.Os
.Sh NAME
.Nm curses_insdelln ,
.Nm insdelln ,
.Nm winsdelln
.Nd curses insert or delete lines routines
.Sh LIBRARY
.Lb libcurses
.Sh SYNOPSIS
.In curses.h
.Ft int
.Fn insdelln "int n"
.Ft int
.Fn winsdelln "WINDOW *win" "int n"
.Sh DESCRIPTION
These functions insert or delete lines on
.Dv stdscr
or on the specified window.
.Pp
If
.Fn insdelln
is called with a positive number in
.Fa n ,
then the specified number of lines are inserted before the current line on
.Dv stdscr .
The last
.Fa n
lines of the screen are no longer displayed.
If
.Fa n
is negative, then
.Fa n
lines are deleted from
.Dv stdscr ,
starting at the current line.
The last
.Fa n
lines of
.Dv stdscr
are cleared.
.Pp
The
.Fn winsdelln
function is the same as the
.Fn insdelln
function, excepting that lines are inserted or deleted from the window
specified by
.Fa win .
.Pp
If a scrolling region has been set with the
.Fn setscrreg
or
.Fn 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.
.Sh RETURN VALUES
Functions returning pointers will return
.Dv NULL
if an error is detected.
The functions that return an int will return one of the following
values:
.Pp
.Bl -tag -width ERR -compact
.It Er OK
The function completed successfully.
.It Er ERR
An error occurred in the function.
.El
.Sh SEE ALSO
.Xr curses_deleteln 3 ,
.Xr curses_insertln 3 ,
.Xr curses_scroll 3
.Sh STANDARDS
The
.Nx
Curses library complies with the X/Open Curses specification, part of
the Single Unix Specification.
.Sh HISTORY
The Curses package appeared in
.Bx 4.0 .