[groff] Duff's Device lurking in refer.cpp

[G. Branden Robinson]

I enjoyed this Easter egg; maybe you will too.

src/preproc/refer/refer.cpp:
  for (--argc, ++argv;
       !finished_options && argc > 0 && argv[0][0] == '-'
       && argv[0][1] != '\0';
       argv++, argc--) {
    const char *opt = argv[0] + 1; 
    while (opt != 0 && *opt != '\0') {
      switch (*opt) {
      case 'C':
        compatible_flag = 1;
        opt++;
        break;
// ...
      case '-':
        if (opt[1] == '\0') {
          finished_options = 1;
          opt++;
          break;
        }
        if (strcmp(opt,"-version")==0) {
      case 'v': // <-- a gibbon on the syntax tree
          printf("GNU refer (groff) version %s\n", Version_string);
          exit(0);
          break;
        }
        if (strcmp(opt,"-help")==0) {
          usage(stdout);
          exit(0);
          break;
        }
        // fall through
      default:
        error("unrecognized option '%1'", *opt);
        usage(stderr);
        exit(1);
        break;
      }
    }
  }

-- 
Regards,
Branden

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