ct_decode_argv
protected wchar_t **ct_decode_argv(int, const char *[], ct_buffer_t *);
ct_decode_argv(argc, argv, &el->el_lgcyconv);
ct_decode_argv(i + 1, argv, &el->el_lgcyconv);
wargv = ct_decode_argv(2, args, &el->el_lgcyconv);