AVR Freaks

Hi all,

I am working on a program that will take command line options and work with a file. The program usage is like this:

program -a -b --linelength=12 filename

Note that the "12" can be any number, but it's a required argument for the option "linelength".

My problem is, if I omit the linelength argument and the filename comes next, then I don't get the "option requires an argument" error, but rather the getopt tries to use the filename as the argument, effectively resulting in this:

program -a -b --linelength=filename

Then, of course, because there is no filename, that generates an error.

I am sure I'm doing something wrong or missing something, because the code should be "smart enough" to avoid this. Any ideas?

Here's (hopefully) the relevant part:

// parse arguments
while ((opt = getopt_long (argc, argv, optstr, lopts, (int *)(0))) != EOF)
{
  switch (opt) {
    case 'c': {
      colors = 1;
      break;
    }
    case 'h': {
      return show_help();
    }
    case 'i': {
      ignore_case = 1;
      break;
    }
    case 'l': {
      lineLength = strtol (optarg, (char **) (0), 10);
      break;
    }
    case 'm': {
      mode = maximized;
      lineLength = 0;
      break;
    }
    case 's': {
      mode = bySector;
      break;
    }
    case '?': {
      if (optopt == 'l') {
        fprintf (stderr, "option -%c requires an argument\n", optopt);
        return 1;
      }
    }
    default: {
      break;
    }
  }
}

if (optind < argc)
{
  fileName = argv[optind];
}

Thanks!