7.6.19 RESTART_OPT( n ) - Resume Option Processing

If option processing has stopped (either because of an error or something was encountered that looked like a program argument), it can be resumed by providing this macro with the index n of the next option to process and calling optionProcess() again.

int main(int argc, char ** argv) {
  for (int ai = 0; ai < argc ;) {
  restart:
    ai = optionProcess(&progOptions, argc, argv);
    for (; ai < argc; ai++) {
      char * arg = arg[ai];
      if (*arg == '-') {
        RESTART_OPT(ai);
        goto restart;
      }
      process(arg);
    }
  }
}

If you want a program to operate this way, you might consider specifying a for-each main function (see for-each main procedure) with the interleaved attribute. It will allow you to process interleaved operands and options from either the command line or when reading them from standard input.