.\" Copyright (c) 2010 Joseph Koshy
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.\" $Id: dwarf_formstring.3 3640 2018-10-14 14:09:13Z jkoshy $
.\"
.Dd July 24, 2010
.Dt DWARF_FORMSTRING 3
.Os
.Sh NAME
.Nm dwarf_formstring
.Nd return the value of a STRING class attribute
.Sh LIBRARY
.Lb libdwarf
.Sh SYNOPSIS
.In libdwarf.h
.Ft int
.Fo dwarf_formstring
.Fa "Dwarf_Attribute attr"
.Fa "char **ret"
.Fa "Dwarf_Error *err"
.Fc
.Sh DESCRIPTION
Function
.Fn dwarf_formstring
sets the location pointed to by argument
.Ar ret
to a pointer to a NUL-terminated string containing
the value of the attribute referenced by argument
.Ar attr .
The form of argument
.Ar attr
must be one of
.Dv DW_FORM_string
or
.Dv DW_FORM_strp .
.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 directly free this memory
area.
.Sh RETURN VALUES
Function
.Fn dwarf_formstring
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_formstring
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_formudata 3 ,
.Xr dwarf_hasattr 3