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'\" t
.\"***************************************************************************
.\" Copyright 2018,2020 Thomas E. Dickey                                     *
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.\" $Id: form_userptr.3x,v 1.16 2020/02/02 23:34:34 tom Exp $
.TH form_userptr 3X ""
.SH NAME
\fBset_form_userptr\fP,
\fBform_userptr\fR \- associate application data with a form item
.SH SYNOPSIS
\fB#include <form.h>\fR
.br
int set_form_userptr(FORM *form, void *userptr);
.br
void* form_userptr(const FORM *form);
.br
.SH DESCRIPTION
Every form and every form item has a field that can be used to hold
application-specific data (that is, the form-driver code leaves it alone).
These functions get and set the form user pointer field.
.SH RETURN VALUE
The function \fBform_userptr\fR returns a pointer (which may be \fBNULL\fR).
It does not set errno.
.PP
The function \fBset_form_userptr\fR returns \fBE_OK\fP (success).
.SH SEE ALSO
\fBcurses\fR(3X), \fBform\fR(3X).
.SH NOTES
The header file \fB<form.h>\fR automatically includes the header file
\fB<curses.h>\fR.
.SH PORTABILITY
These routines emulate the System V forms library.
They were not supported on
Version 7 or BSD versions.
.PP
The user pointer is a void pointer.
We chose not to leave it as a char pointer for SVr4 compatibility.
.SH AUTHORS
Juergen Pfeifer.
Manual pages and adaptation for new curses by Eric S. Raymond.