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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 Joseph Koshy ``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 Joseph Koshy 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_hasform.3 2073 2011-10-27 03:30:47Z jkoshy $
.\"
.Dd May 22, 2010
.Os
.Dt DWARF_HASFORM 3
.Sh NAME
.Nm dwarf_hasform ,
.Nm dwarf_whatform ,
.Nm dwarf_whatform_direct
.Nd query attribute forms
.Sh LIBRARY
.Lb libdwarf
.Sh SYNOPSIS
.In libdwarf.h
.Ft int
.Fo dwarf_hasform
.Fa "Dwarf_Attribute attr"
.Fa "Dwarf_Half form"
.Fa "Dwarf_Bool *ret"
.Fa "Dwarf_Error *err"
.Fc
.Ft int
.Fo dwarf_whatform
.Fa "Dwarf_Attribute attr"
.Fa "Dwarf_Half *retform"
.Fa "Dwarf_Error *err"
.Fc
.Ft int
.Fo dwarf_whatform_direct
.Fa "Dwarf_Attribute attr"
.Fa "Dwarf_Half *retform"
.Fa "Dwarf_Error *err"
.Fc
.Sh DESCRIPTION
Function
.Fn dwarf_hasform
indicates whether the DWARF attribute denoted by argument
.Ar attr
has the attribute form specified by argument
.Ar form .
If the attribute has the specified form, then
argument
.Ar ret
is set to a non-zero value, otherwise it is set to zero.
If argument
.Ar err
is non-NULL, it will be used to return an error descriptor in
case of an error.
.Pp
Function
.Fn dwarf_whatform
sets the location specified by argument
.Ar retform
to the attribute form code for the DWARF attribute referenced
by argument
.Ar attr .
If the attribute referenced by argument
.Ar attr
has an indirect form attribute, this function will return the final
form for the attribute.
If argument
.Ar err
is non-NULL, it will be used to return an error descriptor in
case of an error.
.Pp
Function
.Fn dwarf_whatform_direct
sets the location specified by argument
.Ar retform
to the attribute form code for the DWARF attribute referenced
by argument
.Ar attr .
If the form is an indirect form, the function sets the location
specified by argument
.Ar retform
to
.Dv DW_FORM_indirect .
If argument
.Ar err
is non-NULL, it will be used to return an error descriptor in
case of an error.
.Sh RETURN VALUES
These functions return
.Dv DW_DLV_OK
on success.
In case of an error, these functions return
.Dv DW_DLV_ERR
and set argument
.Ar err .
.Sh ERRORS
These functions may fail with the following errors:
.Bl -tag -width ".Bq Er DW_DLE_ARGUMENT"
.It Bq Er DW_DLE_ARGUMENT
Any of the arguments
.Ar attr ,
.Ar ret ,
or
.Ar retform
was NULL.
.El
.Sh SEE ALSO
.Xr dwarf 3 ,
.Xr dwarf_attr 3 ,
.Xr dwarf_hasattr 3
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