.\"	$NetBSD: dwarf_formflag.3,v 1.3 2016/02/20 02:43:41 christos Exp $
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.\" Copyright (c) 2010 Joseph Koshy
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.\" Id: dwarf_formflag.3 3181 2015-04-10 13:22:51Z emaste 
.\"
.Dd June 21, 2010
.Os
.Dt DWARF_FORMFLAG 3
.Sh NAME
.Nm dwarf_formflag
.Nd return the value of a BOOLEAN class attribute
.Sh LIBRARY
.Lb libdwarf
.Sh SYNOPSIS
.In libdwarf.h
.Ft int
.Fo dwarf_formflag
.Fa "Dwarf_Attribute attr"
.Fa "Dwarf_Bool *ret"
.Fa "Dwarf_Error *err"
.Fc
.Sh DESCRIPTION
Function
.Fn dwarf_formflag
sets the location pointed to by argument
.Ar ret
to 1 if the attribute referenced by argument
.Ar attr
has a non-zero value, or 0 otherwise.
The form of argument
.Ar attr
must be one of
.Dv DW_FORM_flag
or
.Dv DW_FORM_flag_present .
.Pp
If argument
.Ar err
is not NULL, it will be used to return an error descriptor in case
of an error.
.Sh RETURN VALUES
Function
.Fn dwarf_formflag
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_formflag
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_formblock 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