printer_data
struct printer_data *printer_data = extra;
printed += fprintf(fp, "%17s", !printer_data->line_no ? "BPF output:" :
if (printer_data->hit_nul && ch)
printer_data->is_printable = false;
if (!printer_data->is_printable)
printer_data->hit_nul = true;
printer_data->is_printable = false;
printer_data->line_no++;
struct printer_data printer_data = {0, false, true};
sample__fprintf_bpf_output, &printer_data, fp);
if (printer_data.is_printable && printer_data.hit_nul)