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$Id: dwarf_hasform.3 3640 2018-10-14 14:09:13Z jkoshy $
.Dd May 22, 2010 .Dt DWARF_HASFORM 3 .Os .Sh NAME .Nm dwarf_hasform , .Nm dwarf_whatform , .Nm dwarf_whatform_direct .Nd query attribute forms .Sh LIBRARY .Lb libdwarf .Sh SYNOPSIS n 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.
p 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.
p 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: l -tag -width ".Bq Er DW_DLE_ARGUMENT" t 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