1 /**

     2  *     $Id: numerierung.c,v 1.1.1.1 2008-04-28 17:32:53 mbroeker Exp $

     3  * $Source: /development/c/demos/numerierung.c,v $

     4  *

     5  */

     6 

     7 #include <stdio.h>

     8 #include <stdlib.h>

     9 #include <errno.h>

    10 #include <getopt.h>

    11 

    12 void usage (char *cmd)

    13 {

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

    15     exit (0);

    16 }

    17 

    18 int main (int argc, char **argv)

    19 {

    20     char buffer[81];

    21     int counter = 0;

    22     FILE *f;

    23     int c, pure = 0;

    24 

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

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

    27         switch (c) {

    28         case 'h':

    29             usage (argv[0]);

    30             break;

    31         case 'p':

    32             pure = 1;

    33             break;

    34         default:

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

    36         }

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

    38     }

    39 

    40     if (optind == argc)

    41         f = stdin;

    42     else

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

    44 

    45     if (!f) {

    46         perror ("Error opening file");

    47         return EXIT_FAILURE;

    48     }

    49 

    50     *buffer = 0;

    51 

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

    53         if (!pure)

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

    55         else

    56             printf ("%s", buffer);

    57         *buffer = 0;

    58     }

    59 

    60     fclose (f);

    61     return EXIT_SUCCESS;

    62 }