135 lines
4.1 KiB
Groff
135 lines
4.1 KiB
Groff
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.\" $NetBSD: form_field_buffer.3,v 1.13 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 October 15, 2005
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.Dt FORMS 3
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.Os
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.Sh NAME
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.Nm field_buffer ,
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.Nm field_status ,
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.Nm set_field_buffer ,
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.Nm set_field_printf ,
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.Nm set_field_status ,
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.Nm set_max_field
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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 char *
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.Fn field_buffer "FIELD *field" "int buffer"
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.Ft int
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.Fn field_status "FIELD *field"
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.Ft int
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.Fn set_field_buffer "FIELD *field" "int buffer" "char *value"
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.Ft int
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.Fn set_field_printf "FIELD *field" "int buffer" "char *fmt" "..."
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.Ft int
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.Fn set_field_status "FIELD *field" "int status"
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.Ft int
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.Fn set_max_field "FIELD *field" "int max"
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.Sh DESCRIPTION
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The
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.Fn field_buffer
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function returns the contents of the buffer number specified by
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.Fa buffer
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for the given field.
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If the requested buffer number exceeds the
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number of buffers attached to the field then
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.Dv NULL
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will be returned.
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If the field option
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.Dv O_REFORMAT
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is enabled on the given field then
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storage will be allocated to hold the reformatted buffer.
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This storage must be release by calling
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.Xr free 3
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when it is no longer required.
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If the
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.Dv O_REFORMAT
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field option is not set then no extra storage is allocated.
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The field buffer may be set by calling
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.Fn set_field_buffer
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which will set the given buffer number to the contents of the string
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passed.
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A buffer may also be set by calling
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.Fn set_field_printf
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which sets the buffer using the format arg
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.Fa fmt
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after being expanded using the subsequent arguments in the same manner
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as
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.Xr sprintf 3
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does.
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Calling
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.Fn field_status
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will return the status of the first buffer attached to the field.
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If the field has been modified then the function will return
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.Dv TRUE
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otherwise
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.Dv FALSE
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is returned, the status of the first buffer may be
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programmatically set by calling
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.Fn set_field_status .
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The maximum growth of a dynamic field can be set by calling
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.Fn set_max_field
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which limits the fields rows if the field is a multiline field or the
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fields columns if the field only has a single row.
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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_BAD_ARGUMENT
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A bad parameter was passed to the function.
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.It Er E_SYSTEM_ERROR
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A system error occurred performing the function.
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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 function
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.Fn set_field_printf
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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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