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struct someStuff_t {

    int SDM120reg;

    int debug;

    char serial[20];

    };

int main(int argc, char *argv[])

{

  ...

  ...

  ...

    struct someStuff_t someStuff;

// Step1: Extract the selected register and serial interface

// Example:

// readSDM120 -d 1 -s /dev/ttyS0 -r 30013

// DEBUG Mode 1, svalue = /dev/ttyS0, rvalue => SDM120_POWER

    if (argc == 1) {

        printf ("Use with command line options (-h for help).\n");

        return (0);

  }

    evaluate_main (argc, argv, &someStuff);  // someStuff wird mit den ausgewerteten Kommandozeilen-Argumenten gefüllt

  ...

  ...

  ...

}

int evaluate_main (int eval_argc, char **eval_argv, struct someStuff_t *stuff)

{

  int dflag = 0;  //debug

  int sflag = 0;  //serial interface

  int rflag = 0;  //register flag

  char *svalue = NULL;  //serial interface as string

  char *rvalue = NULL;  //register value as string

  char *dvalue = NULL;  //debug mode as string : 1 or 2

  int base = 10;

  char *endptr;

  int index;

  int c;

  opterr = 0;

/* Get data from SDM120 Modbus device

 Parameter:

 -d debug mode

 -s serial

 -r Input register (3x range) start address of the slave device. Always 'address' and 'address+1' are fetched

    as IEEE-754 float is stored in 2x16 bit registers

 example: fetch current from SDM120 via /dev/ttyS0

 SDM120 -d -s /dev/ttyS0 -r 30007

*/

  while ((c = getopt (eval_argc, eval_argv, "d:hs:r:")) != -1)

    switch (c)

      {

      case 'h':

        //Help

        printf("SDM120 readout.\n");

        printf("Use with option:\n");

        printf(" -h  This help here\n");

        printf(" -d  Debug mode, 1: read single input register, 2: read all input registers\n");

        printf(" -s  Serial interface: /dev/ttyS0, /dev/ttyACM0...\n");

        printf(" -r  Register to be read: 30001, 30006, 30343...\n");

        printf("Example: SDM120 -d 1 -s /dev/ttyS0 -r 30001\n\n");

        printf("\n");

        exit ();

       case 'd':

        printf ("DEBUG mode\n");

        dvalue = optarg;

        stuff->debug = strtol(dvalue, &endptr, base);

        if (stuff->debug == 1) dflag = 1;

        break;

       case 's':

        sflag = 1;

      //  svalue = optarg;

        strcpy (stuff->serial, optarg);

        break;

      case 'r':

    //    rvalue = optarg;

        // val =

        //stuff->SDM120reg = strtol(rvalue, &endptr, base);

        stuff->SDM120reg = strtol(optarg, &endptr, base);

        rflag = 1;

        break;

      case '?':

        if ((optopt == 'r') || (optopt == 's')||(optopt == 'd'))

          fprintf (stderr, "Option -%c requires an argument.\n", optopt);

        else if (isprint (optopt))

          fprintf (stderr, "Unknown option `-%c'.\n", optopt);

        else

          fprintf (stderr,

                   "Unknown option character `\\x%x'.\n",

                   optopt);

        return 1;

      default:

        abort ();

      }

     if (stuff->debug == 1) printf ("Local: dflag = %d, sflag = %d rflag = %d, svalue = %s, rvalue = %s\n",

                dflag, sflag, rflag, svalue, rvalue);

  for (index = optind; index < eval_argc; index++)

    printf ("ERROR (ignored): Non-option argument %s\n", eval_argv[index]);

  return 0;

}