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.\" Copyright (c) 2010 Joseph Koshy
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $Id: dwarf_formblock.3 3182 2015-04-10 16:08:10Z emaste $
.\"
.Dd July 23, 2010
.Os
.Dt DWARF_FORMBLOCK 3
.Sh NAME
.Nm dwarf_formblock
.Nd return the value of a BLOCK attribute
.Sh LIBRARY
.Lb libdwarf
.Sh SYNOPSIS
.In libdwarf.h
.Ft int
.Fo dwarf_formblock
.Fa "Dwarf_Attribute attr"
.Fa "Dwarf_Block **ret"
.Fa "Dwarf_Error *err"
.Fc
.Sh DESCRIPTION
Function
.Fn dwarf_formblock
sets the location pointed to by argument
.Ar ret
to a pointer to a
.Vt Dwarf_Block
structure containing the value of the attribute referenced
by argument
.Ar attr .
The form of argument
.Ar attr
must be one of
.Dv DW_FORM_block ,
.Dv DW_FORM_block1 ,
.Dv DW_FORM_block2
or
.Dv DW_FORM_block4 .
.Pp
If argument
.Ar err
is not NULL, it will be used to return an error descriptor in case
of an error.
.Ss Memory Management
The memory area referenced by the returned pointer is managed by
the DWARF(3) library.
The application should not attempt to free this memory
area.
Portable code may indicate that the memory area is to be freed by
using
.Xr dwarf_dealloc 3 .
.Sh RETURN VALUES
Function
.Fn dwarf_formblock
returns
.Dv DW_DLV_OK
on success.
In case of an error, it returns
.Dv DW_DLV_ERROR
and sets argument
.Ar err .
.Sh ERRORS
Function
.Fn dwarf_formblock
may fail with the following errors:
.Bl -tag -width ".Bq Er DW_DLE_ATTR_FORM_BAD"
.It Bq Er DW_DLE_ARGUMENT
Either of arguments
.Ar attr
or
.Ar ret
was NULL.
.It Bq Er DW_DLE_ATTR_FORM_BAD
The attribute referenced by argument
.Ar attr
was not of a permitted kind.
.El
.Sh SEE ALSO
.Xr dwarf 3 ,
.Xr dwarf_attr 3 ,
.Xr dwarf_formflag 3 ,
.Xr dwarf_formref 3 ,
.Xr dwarf_formsdata 3 ,
.Xr dwarf_formsig8 3 ,
.Xr dwarf_formstring 3 ,
.Xr dwarf_formudata 3 ,
.Xr dwarf_hasattr 3
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