numerierung.c
author Markus Bröker <mbroeker@largo.dyndns.tv>
Thu, 16 Apr 2009 12:46:53 +0200
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/**
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 * test/demos/numerierung.c
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 * Copyright (C) 2008 Markus Broeker
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <getopt.h>
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void usage (char *cmd)
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{
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    printf ("Usage: %s [-h] [-t] [-v] [file]\n", cmd);
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    exit (0);
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}
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int main (int argc, char **argv)
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{
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    char buffer[81];
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    int counter = 0;
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    FILE *f;
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    int c, pure = 0;
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    while ((c = getopt (argc, argv, "hp")) != -1) {
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        printf ("Zeichen: %c\n", c);
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        switch (c) {
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        case 'h':
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            usage (argv[0]);
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            break;
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        case 'p':
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            pure = 1;
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            break;
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        default:
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            printf ("Unknown Parameter: %s\n", argv[optind]);
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        }
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        printf ("GETOPT: %d : %s\n", optind, argv[optind]);
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    }
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    if (optind == argc)
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        f = stdin;
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    else
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        f = fopen (argv[optind], "r");
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    if (!f) {
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        perror ("Error opening file");
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        return EXIT_FAILURE;
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    }
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    *buffer = 0;
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    while (fgets (buffer, 80, f) != NULL) {
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        if (!pure)
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            printf ("%4.4d: %s", counter++, buffer);
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        else
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            printf ("%s", buffer);
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        *buffer = 0;
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    }
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    fclose (f);
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    return EXIT_SUCCESS;
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}