.\"	$NetBSD: form_field_new.3,v 1.11 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.
.\"
.\" 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.
.\" 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
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.Dd January 1, 2001
.Dt FORMS 3
.Os
.Sh NAME
.Nm dup_field ,
.Nm free_field ,
.Nm link_field ,
.Nm new_field
.Nd form library
.Sh LIBRARY
.Lb libform
.Sh SYNOPSIS
.In form.h
.Ft FIELD *
.Fn dup_field "FIELD *field" "int frow" "int fcol"
.Ft int
.Fn free_field "FIELD *field"
.Ft FIELD *
.Fn link_field "FIELD *field" "int frow" "int fcol"
.Ft FIELD *
.Fo new_field
.Fa "int rows"
.Fa "int cols"
.Fa "int frow"
.Fa "int fcol"
.Fa "int nrows"
.Fa "int nbuf"
.Fc
.Sh DESCRIPTION
The
.Fn dup_field
function duplicates the given field, including any buffers associated
with the field and returns the pointer to the newly created field.
.Fn free_field
destroys the field and frees any allocated resources associated with
the field.
The function
.Fn link_field
copies the given field to a new field at the location
.Fa frow
and
.Fa fcol
but shares the buffers with the original field.
.Fn new_field
creates a new field of size
.Fa rows
by
.Fa cols
at location
.Fa frow ,
.Fa fcol
on the page, the argument
.Fa nrows
specified the number of off screen rows the field has and the
.Fa nbuf
parameter specifies the number of extra buffers attached to the
field.
There will always be one buffer associated with a field.
.Sh RETURN VALUES
On error
.Fn dup_field
and
.Fn new_field
will return
.Dv NULL .
The functions will 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_BAD_ARGUMENT
A bad argument was passed to the function.
.It Er E_CONNECTED
The field is connected to a form.
.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 .