158 lines
4.8 KiB
Groff
158 lines
4.8 KiB
Groff
.\" $NetBSD: form_field_opts.3,v 1.11 2010/03/22 21:58:31 joerg 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 field_opts ,
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.Nm field_opts_off ,
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.Nm field_opts_on ,
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.Nm set_field_opts
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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 Form_Options
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.Fn field_opts "FIELD *field"
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.Ft int
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.Fn field_opts_off "FIELD *field" "Form_Options options"
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.Ft int
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.Fn field_opts_on "FIELD *field" "Form_Options options"
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.Ft int
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.Fn set_field_opts "FIELD *field" "Form_Options options"
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.Sh DESCRIPTION
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The function
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.Fn field_opts
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returns the current options settings for the given field.
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The
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.Fn field_opts_off
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will turn the options given in
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.Fa options
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off for the given field, options not specified in
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.Fa options
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will remain unchanged.
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Conversely, the function
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.Fn field_opts_on
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will turn on the options given in
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.Fa options
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for the specified field, again, any options not specified will remain
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unchanged.
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The options for a field may be set to a specific set of
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options by calling the
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.Fn set_field_opts
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function.
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Options may only be changed if the field given is not the
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currently active one.
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.Sh PARAMETERS
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The following options are available for a field:
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.Pp
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.Bl -tag -width O_REFORMAT -compact
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.It Dv O_VISIBLE
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The field is visible, hence is displayed when the form is posted.
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.It Dv O_ACTIVE
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The field is active in the form, meaning that it can be visited during
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form processing.
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.It Dv O_PUBLIC
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The contents of the field are echoed to the screen.
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.It Dv O_EDIT
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The contents of the field can be modified
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.It Dv O_WRAP
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The contents of the field are wrapped on a word boundary, if this
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option is off then the field will be wrapped on a character boundary.
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.It Dv O_BLANK
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Blank the field on new data being entered if and only if the field
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cursor is at the left hand side of the field.
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.It Dv O_AUTOSKIP
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Skip to the next field when the current field reaches its maximum
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size.
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.It Dv O_NULLOK
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The field is allowed to contain no data
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.It Dv O_STATIC
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The field is not dynamic, it has a fixed size.
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.It Dv O_PASSOK
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An unmodified field is allowed.
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.It Dv O_REFORMAT
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Retain the formatting of a field when the buffer is retrieved.
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If this option is not set then the buffer returned will be a single string
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with no line breaks.
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When this option is set newline characters will be inserted at the point
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where the string has been wrapped in a multiline field.
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This option is an extension to the forms library and must not be used
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in portable code.
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See the
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.Xr field_buffer 3
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man page for how this option modifies the behaviour of
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.Fn field_buffer .
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.El
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.Pp
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The following options are on by default for a field:
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.Dv O_VISIBLE ,
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.Dv O_ACTIVE ,
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.Dv O_PUBLIC ,
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.Dv O_EDIT ,
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.Dv O_WRAP ,
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.Dv O_BLANK ,
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.Dv O_AUTOSKIP ,
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.Dv O_NULLOK ,
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.Dv O_PASSOK ,
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and
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.Dv O_STATIC .
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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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.It Er E_CURRENT
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The field specified is the currently active one in 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 forms 3
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.Sh NOTES
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The header
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.In form.h
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automatically includes both
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.In curses.h
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and
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.In eti.h .
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The option
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.Dv O_REFORMAT
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is a
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.Nx
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extension and must not be used in portable code.
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