236 lines
9.0 KiB
Groff
236 lines
9.0 KiB
Groff
.\" $NetBSD: forms.3,v 1.17 2017/07/03 21:32:50 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 November 24, 2004
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.Dt FORMS 3
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.Os
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.Sh NAME
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.Nm form
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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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.Sh DESCRIPTION
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The
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.Nm
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library provides a terminal independent form system using the
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.Xr curses 3
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library.
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Before using the
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.Nm
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functions the terminal must be set up by
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.Xr curses 3
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using the
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.Fn initscr
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function or similar.
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Programs using
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.Nm
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functions must be linked with the
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.Xr curses 3
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library
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.Fl lcurses .
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.Pp
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The
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.Nm
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library provides facilities for defining form fields, placing a form on the
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terminal screen, assign pre and post change operations and setting the
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attributes of both the form and its fields.
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.Ss Defining default attributes for forms and fields
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The
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.Nm
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library allows any settable attribute or option of both the form and field
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objects to be defined such that any new form or field automatically inherits
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the value as default.
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Setting the default value will not affect any field or
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form that has already been created but will be applied to subsequent objects.
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To set the default attribute or option the set routine is passed a
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.Dv NULL
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pointer in the field or form parameter when calling the set routine.
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The current default value can be retrieved by calling the get routine with a
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.Dv NULL
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pointer for the field or form parameter.
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.Pp
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.Bl -column set_fieldtype_choiceXX
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.It Sy "Form Routine Name" Ta Sy "Manual Page Name"
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.It current_field Ta Xr form_page 3
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.It data_ahead Ta Xr form_data 3
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.It data_behind Ta Xr form_data 3
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.It dup_field Ta Xr form_field_new 3
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.It dynamic_field_info Ta Xr form_field_info 3
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.It field_arg Ta Xr form_field_validation 3
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.It field_back Ta Xr form_field_attributes 3
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.It field_buffer Ta Xr form_field_buffer 3
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.It field_count Ta Xr form_field 3
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.It field_fore Ta Xr form_field_attributes 3
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.It field_index Ta Xr form_page 3
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.It field_info Ta Xr form_field_info 3
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.It field_init Ta Xr form_hook 3
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.It field_just Ta Xr form_field_just 3
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.It field_opts Ta Xr form_field_opts 3
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.It field_opts_off Ta Xr form_field_opts 3
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.It field_opts_on Ta Xr form_field_opts 3
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.It field_pad Ta Xr form_field_attributes 3
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.It field_status Ta Xr form_field_buffer 3
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.It field_term Ta Xr form_hook 3
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.It field_type Ta Xr form_field_validation 3
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.It field_userptr Ta Xr form_field_userptr 3
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.It form_driver Ta Xr form_driver 3
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.It form_fields Ta Xr form_field 3
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.It form_init Ta Xr form_hook 3
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.It form_max_page Ta Xr form_page 3
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.It form_opts Ta Xr form_opts 3
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.It form_opts_off Ta Xr form_opts 3
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.It form_opts_on Ta Xr form_opts 3
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.It form_page Ta Xr form_page 3
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.It form_sub Ta Xr form_win 3
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.It form_term Ta Xr form_hook 3
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.It form_userptr Ta Xr form_userptr 3
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.It form_win Ta Xr form_win 3
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.It free_field Ta Xr form_field_new 3
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.It free_fieldtype Ta Xr form_fieldtype 3
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.It free_form Ta Xr form_new 3
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.It link_field Ta Xr form_field_new 3
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.It link_fieldtype Ta Xr form_fieldtype 3
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.It move_field Ta Xr form_field 3
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.It new_field Ta Xr form_field_new 3
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.It new_fieldtype Ta Xr form_fieldtype 3
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.It new_form Ta Xr form_new 3
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.It new_page Ta Xr form_new_page 3
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.It pos_form_cursor Ta Xr form_cursor 3
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.It post_form Ta Xr form_post 3
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.It scale_form Ta Xr form_win 3
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.It set_current_field Ta Xr form_page 3
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.It set_field_back Ta Xr form_field_attributes 3
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.It set_field_buffer Ta Xr form_field_buffer 3
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.It set_field_fore Ta Xr form_field_attributes 3
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.It set_field_init Ta Xr form_hook 3
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.It set_field_just Ta Xr form_field_just 3
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.It set_field_opts Ta Xr form_field_opts 3
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.It set_field_pad Ta Xr form_field_attributes 3
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.It set_field_printf Ta Xr form_field_buffer 3
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.It set_field_status Ta Xr form_field_buffer 3
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.It set_field_term Ta Xr form_hook 3
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.It set_field_type Ta Xr form_field_validation 3
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.It set_field_userptr Ta Xr form_field_userptr 3
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.It set_fieldtype_arg Ta Xr form_fieldtype 3
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.It set_fieldtype_choice Ta Xr form_fieldtype 3
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.It set_form_fields Ta Xr form_field 3
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.It set_form_init Ta Xr form_hook 3
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.It set_form_opts Ta Xr form_opts 3
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.It set_form_page Ta Xr form_page 3
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.It set_form_sub Ta Xr form_win 3
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.It set_form_term Ta Xr form_hook 3
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.It set_form_userptr Ta Xr form_userptr 3
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.It set_form_win Ta Xr form_win 3
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.It set_max_field Ta Xr form_field_buffer 3
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.It set_new_page Ta Xr form_new_page 3
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.It unpost_form Ta Xr form_post 3
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.El
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.Sh RETURN VALUES
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Any function returning a string pointer will return
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.Dv NULL
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if an error occurs.
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Functions returning an integer will return one of the following:
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.Bl -column set_fieldtype_choiceXX
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.It Dv E_OK Ta No The function was successful.
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.It Dv E_SYSTEM_ERROR Ta No There was a system error during the call.
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.It Dv E_BAD_ARGUMENT Ta No One or more of the arguments passed to \
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the function was incorrect.
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.It Dv E_POSTED Ta No The form is already posted.
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.It Dv E_CONNECTED Ta No A field was already connected to a form.
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.It Dv E_BAD_STATE Ta No The function was called from within an \
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initialization or termination routine.
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.It Dv E_NO_ROOM Ta No The form does not fit within the subwindow.
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.It Dv E_NOT_POSTED Ta No The form is not posted.
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.It Dv E_UNKNOWN_COMMAND Ta No The form driver does not recognize the \
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request passed to it.
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.It Dv E_NOT_SELECTABLE Ta No The field could not be selected.
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.It Dv E_NOT_CONNECTED Ta No The field is not connected to a form.
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.It Dv E_REQUEST_DENIED Ta No The form driver could not process the request.
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.It Dv E_INVALID_FIELD Ta No The field is invalid.
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.It Dv E_CURRENT Ta No The field is the active one on the form.
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.El
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.Sh SEE ALSO
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.Xr curses 3 ,
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.Xr menus 3
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.Sh NOTES
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This implementation of the forms library does depart in behavior
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subtly from the original AT&T implementation.
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Some of the more notable departures are:
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.Pp
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.Bl -tag -width "The TAB character" -compact
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.It field wrapping
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For multi-line fields the data will be wrapped as it is entered, this
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does not happen in the AT&T implementation.
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.It buffer 0
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In this implementation, the contents of buffer 0 are always current
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regardless of whether the field has been validated or not.
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.It circular fields
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In the AT&T implementation fields are circular on a page, that is, a
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next field from the last field will go to the first field on the
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current page.
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In this implementation a next field request on the last
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field of a page will result in the forms library positioning the
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cursor on the first field of the next page.
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If the field is the last
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field in the form then going to the next field will be denied, in the
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AT&T it would result in the cursor being placed on the first field of
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the first page.
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.It buffer returns
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In this implementation only the data entered by the user in the form
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field will be returned, unlike the AT&T library which would return the
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contents of the field padded to the size of the field with the pad
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character.
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.It The TAB character
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The handling of the TAB character in fields varies between
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implementations.
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In ncurses attempting to set a field contents with a
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string containing a TAB will result in an error and will not allow a
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TAB to be entered into a field.
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The AT&T library statically
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converts tabs to the equivalent number of spaces when the field buffer
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is set but the form driver will not allow a TAB to be inserted into
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the field buffer.
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This implementation allows TAB when setting the
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field buffer and also will allow TAB to be inserted into a field
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buffer via the form driver and correctly calculates the cursor
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position allowing for expansion of the TAB character.
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.It set_field_printf
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This function is a
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.Nx
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extension and must not be used in portable code.
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.It Dv O_REFORMAT
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This field option is a
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.Nx
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extension and must not be used in portable code.
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.El
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