/**

 */

#include <stdio.h>

#include <stdlib.h>

#include <errno.h>

#include <getopt.h>

void usage (char *cmd)

{

    printf ("Usage: %s [-h] [-t] [-v] [file]\n", cmd);

    exit (0);

}

int main (int argc, char **argv)

{

    char buffer[81];

    int counter = 0;

    FILE *f;

    int c, pure = 0;

    while ((c = getopt (argc, argv, "hp")) != -1) {

        printf ("Zeichen: %c\n", c);

        switch (c) {

        case 'h':

            usage (argv[0]);

            break;

        case 'p':

            pure = 1;

            break;

        default:

            printf ("Unknown Parameter: %s\n", argv[optind]);

        }

        printf ("GETOPT: %d : %s\n", optind, argv[optind]);

    }

    if (optind == argc)

        f = stdin;

    else

        f = fopen (argv[optind], "r");

    if (!f) {

        perror ("Error opening file");

        return EXIT_FAILURE;

    }

    *buffer = 0;

    while (fgets (buffer, 80, f) != NULL) {

        if (!pure)

            printf ("%4.4d: %s", counter++, buffer);

        else

            printf ("%s", buffer);

        *buffer = 0;

    }

    fclose (f);

    return EXIT_SUCCESS;

}