getopt_POSIX_CORRECTLY

getopt_long_POSIX.c

#include <stdio.h>     /* for printf */
#include <stdlib.h>    /* for exit */
#include <getopt.h>

int
main(int argc, char **argv)
{
    int c;
    int digit_optind = 0;

    while (1) {
        int this_option_optind = optind ? optind : 1;
        int option_index = 0;
        static struct option long_options[] =
        {
          {"add", 1, 0, 0},
          {"append", 0, 0, 0},
          {"delete", 1, 0, 0},
          {"verbose", 0, 0, 0},
          {"create", 1, 0, aqcaq},
          {"file", 1, 0, 0},
          {0, 0, 0, 0}
        };

        c = getopt_long(argc, argv, "abc:d:012",
                        long_options, &option_index);
        if (c == -1)
            break;

        switch (c) {
        case 0:
            printf("option %s", long_options[option_index].name);
            if (optarg)
                printf(" avec argument %s", optarg);
            printf("\n");
            break;

        case aq0aq:
        case aq1aq:
        case aq2aq:
            if (digit_optind != 0 && digit_optind != this_option_optind)
                printf("chiffre dans deux arguments.\n");
            digit_optind = this_option_optind;
            printf("option %c\n", c);
            break;

        case aqaaq:
            printf("option a\n");
            break;

        case aqbaq:
            printf("option b\n");
            break;

        case aqcaq:
            printf("option c de valeur aq%saq\n", optarg);
            break;

        case aqdaq:
            printf("option d de valeur aq%saq\n", optarg);
            break;

        case aq?aq:
            break;

        default:
            printf("?? caractère de code 0%o ??\n", c);
        }
    }

    if (optind < argc) {
        printf("Arguments ne constituant pas des options : ");
        while (optind < argc)
        printf("%s ", argv[optind++]);
        printf("\n");
    }

    exit(EXIT_SUCCESS);
}

getopt_POSIX.c

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>

int
main(int argc, char *argv[])
{
    int flags, opt;
    int nsecs, tfnd;

    nsecs = 0;
    tfnd = 0;
    flags = 0;
    while ((opt = getopt(argc, argv, "nt:")) != -1) {
        switch (opt) {
        case aqnaq:
            flags = 1;
            break;
        case aqtaq:
            nsecs = atoi(optarg);
            tfnd = 1;
            break;
        default: /* aq?aq */
            fprintf(stderr, "Usage: %s [-t nsecs] [-n] name\n",
                    argv[0]);
            exit(EXIT_FAILURE);
        }
    }

    printf("flags=%d; tfnd=%d; optind=%d\n", flags, tfnd, optind);

    if (optind >= argc) {
        fprintf(stderr, "Expected argument after options\n");
        exit(EXIT_FAILURE);
    }

    printf("name argument = %s\n", argv[optind]);

    /* Other code omitted */

    exit(EXIT_SUCCESS);
}