117 lines
3.6 KiB
Groff
117 lines
3.6 KiB
Groff
.\" $NetBSD: form_hook.3,v 1.9 2004/11/24 12:26:23 wiz Exp $
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.\"
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.\" Copyright (c) 2001
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.\" Brett Lymn - blymn@baea.com.au, brett_lymn@yahoo.com.au
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.\"
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.\" This code is donated to The NetBSD Foundation by the author.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. The name of the Author may not be used to endorse or promote
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.\" products derived from this software without specific prior written
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.\" permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd January 1, 2001
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.Dt FORMS 3
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.Os
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.Sh NAME
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.Nm field_init ,
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.Nm field_term ,
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.Nm form_init ,
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.Nm form_term ,
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.Nm set_field_init ,
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.Nm set_field_term ,
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.Nm set_form_init ,
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.Nm set_form_term
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.Nd form library
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.Sh LIBRARY
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.Lb libform
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.Sh SYNOPSIS
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.In form.h
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.Ft void (*)(FORM *)
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.Fn field_init "FORM *form"
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.Ft void (*)(FORM *)
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.Fn field_term "FORM *form"
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.Ft void (*)(FORM *)
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.Fn form_init "FORM *form"
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.Ft void (*)(FORM *)
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.Fn form_term "FORM *form"
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.Ft int
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.Fn set_field_init "FORM *form" "void (*function)(FORM *)"
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.Ft int
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.Fn set_field_term "FORM *form" "void (*function)(FORM *)"
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.Ft int
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.Fn set_form_init "FORM *form" "void (*function)(FORM *)"
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.Ft int
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.Fn set_form_term "FORM *form" "void (*function)(FORM *)"
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.Sh DESCRIPTION
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The
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.Fn field_init
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function returns a pointer to the function that will be called just
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after the current field changes and just before the form is posted,
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this function may be set by using the
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.Fn set_field_init
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function.
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Similarly, the function
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.Fn field_term
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will return a pointer to the function that will be called just before
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the current field changes and just after the form is unposted, this
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function pointer may be set by using the
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.Fn set_field_term
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function.
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The
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.Fn form_init
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function will return a pointer to the function that will be called
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just before the form is posted to the screen, this function can be set
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by calling the
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.Fn set_form_init
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function.
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The
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.Fn form_term
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function will return a pointer to the function that will be called
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just after the form is unposted from the screen, this function may be
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set by using the
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.Fn set_form_term
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function.
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By default, the init and term function pointers are
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.Dv NULL .
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.Sh RETURN VALUES
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Functions returning pointers will return
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.Dv NULL
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if an error is detected.
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The functions that return an int will return one of the following error
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values:
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.Pp
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.Bl -tag -width E_UNKNOWN_COMMAND -compact
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.It Er E_OK
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The function was successful.
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.El
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.Sh SEE ALSO
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.Xr curses 3 ,
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.Xr forms 3
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.Sh NOTES
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The header
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.Aq Pa form.h
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automatically includes both
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.Aq Pa curses.h
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and
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.Aq Pa eti.h .
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