728   char *files_from = nullptr;  in main()  local
779         files_from = optarg;  in main()
807   if (files_from)  in main()
821       if (STREQ (files_from, "-"))  in main()
825           stream = fopen (files_from, "r");  in main()
828                    quoteaf (files_from));  in main()
842                    quoteaf (files_from));  in main()
877       if (files_from && STREQ (files_from, "-") && STREQ (file_name, "-"))  in main()
893           if (files_from == nullptr)  in main()
900               error (0, 0, "%s:%zu: %s", quotef (files_from),  in main()
920       error (0, errno, _("%s: read error"), quotef (files_from));  in main()
934   if (ok && !files_from && argv_iter_n_args (ai) == 0)  in main()