.\"	$NetBSD: form_win.3,v 1.10 2010/03/22 21:58:31 joerg Exp $
.\"
.\" Copyright (c) 2001
.\"	Brett Lymn - blymn@baea.com.au, brett_lymn@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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.\"    notice, this list of conditions and the following disclaimer in the
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.\"    products derived from this software without specific prior written
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.Dd January 1, 2001
.Dt FORMS 3
.Os
.Sh NAME
.Nm form_sub ,
.Nm form_win ,
.Nm scale_form ,
.Nm set_form_sub ,
.Nm set_form_win
.Nd form library
.Sh LIBRARY
.Lb libform
.Sh SYNOPSIS
.In form.h
.Ft WINDOW *
.Fn form_sub "FORM *form"
.Ft WINDOW *
.Fn form_win "FORM *form"
.Ft int
.Fn scale_form "FORM *form" "int *rows" "int *cols"
.Ft int
.Fn set_form_sub "FORM *form" "WINDOW *window"
.Ft int
.Fn set_form_win "FORM *form" "WINDOW *window"
.Sh DESCRIPTION
All output to the screen done by the forms library is handled by the
curses library routines.
By default, the forms library will output to the curses
.Fa stdscr ,
but if the forms window has been set via
.Fn set_form_win
then output will be sent to the window specified by
.Fn set_form_win ,
unless the forms subwindow has been set using
.Fn set_form_sub .
If a subwindow has been specified using
.Fn set_form_sub
then it will be used by the forms library to for screen output.
The current setting for the form window can be retrieved by calling
.Fn form_win .
If the forms window has not been set then
.Dv NULL
will be returned.
Similarly, the forms subwindow can be found by calling the
.Fn form_sub
function, again, if the subwindow has not been set then
.Dv NULL
will be
returned.
The
.Fn scale_form
function will return the minimum number of rows and columns that will
entirely contain the given form.
.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 error
values:
.Pp
.Bl -tag -width E_UNKNOWN_COMMAND -compact
.It Er E_OK
The function was successful.
.It Er E_NOT_CONNECTED
The form has no fields connected to it.
.It Er E_POSTED
The form is posted to the screen.
.El
.Sh SEE ALSO
.Xr curses 3 ,
.Xr forms 3
.Sh NOTES
The header
.In form.h
automatically includes both
.In curses.h
and
.In eti.h .