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 Copyright (c) 2002
 Brett Lymn (blymn (at] NetBSD.org, brett_lymn (at] yahoo.com.au)

 This code is donated to the NetBSD Foundation by the Author.

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 modification, are permitted provided that the following conditions
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 1. Redistributions of source code must retain the above copyright
 notice, this list of conditions and the following disclaimer.
 2. Redistributions in binary form must reproduce the above copyright
 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.

 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.Dd February 19, 2010
.Dt CURSES_LINE 3
.Os
.Sh NAME
.Nm curses_line ,
.Nm hline ,
.Nm whline ,
.Nm vline ,
.Nm wvline ,
.Nm mvhline ,
.Nm mvwhline ,
.Nm mvvline ,
.Nm mvwvline
.Nd curses draw lines on windows routines
.Sh LIBRARY
.Lb libcurses
.Sh SYNOPSIS
n curses.h .Ft int
.Fn hline "chtype ch" "int n"
.Ft int
.Fn whline "WINDOW *win" "chtype ch" "int n"
.Ft int
.Fn mvhline "int y" "int x" "chtype ch" "int n"
.Ft int
.Fn mvwvline "WINDOW *win" "int y" "int x" "chtype c" "int n"
.Ft int
.Fn vline "chtype c" "int n"
.Ft int
.Fn wvline "WINDOW *win" "chtype c" "int n"
.Ft int
.Fn mvvline "int y" "int x" "chtype ch" "int n"
.Ft int
.Fn mvwhline "WINDOW *win" "int y" "int x" "chtype c" "int n"
.Sh DESCRIPTION
These functions draw lines on
.Va stdscr
or on the specified window.

p
The
.Fn hline
function draws a horizontal line of the character
.Fa ch
on
.Va stdscr
starting at the current cursor position and extending for
.Fa n
characters, or until the right hand side of
.Va stdscr
is reached.
If the text portion of
.Fa ch
is 0 then the line will be drawn with the
.Dv ACS_HLINE
character.

p
The
.Fn whline
function is the same as the
.Fn hline
function, excepting that the line is drawn in the window specified by
.Fa win .

p
The
.Fn vline
function draws a vertical line of character
.Fa ch
on
.Va stdscr
starting at the current cursor position and moving down until either
.Fa n
characters have been drawn or the bottom of
.Va stdscr
is reached.
If the text portion of
.Fa ch
is 0 then the line will be drawn with the
.Dv ACS_VLINE
character.

p
The
.Fn wvline
function is the same as the
.Fn vline
function, excepting that the line is drawn on the given window.

p
The
.Fn mvhline ,
.Fn mvwhline ,
.Fn mvvline
and
.Fn mvwvline
functions are the same as the
.Fn hline ,
.Fn whline ,
.Fn vline
and
.Fn wvline
functions, respectively, excepting that
.Fn wmove
is called to move the cursor to the position specified by
.Fa y ,
.Fa x
before the line is drawn on the window.
.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:

p
l -tag -width ERR -compact t Er OK The function completed successfully.
t Er ERR An error occurred in the function.
.El
.Sh SEE ALSO
.Xr curses_border 3
.Sh STANDARDS
The
.Nx
Curses library complies with the X/Open Curses specification, part of
the Single Unix Specification.

p
The use of
.Dv ACS_HLINE
and
.Dv ACS_VLINE
as default drawing character in
.Fn hline
and
.Fn vline
is a
.Nx
extension which should not be relied on in portable code.
.Sh HISTORY
The Curses package appeared in
x 4.0 .