C getopt

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

void parse_options(int argc, char *argv[])
{
    static struct option long_options[] = {
        {"version", no_argument, 0, 'v'},
        {"quiet", no_argument, 0, 'q'},
        {"wait", required_argument, 0, 'W'},
        {0, 0, 0, 0},
    };

    static const char *options_string = "vqhW:";
    int c, i;
    int option_index = 0;
    optind = 1;  // reset getopt

    while (1) {
        c = getopt_long(argc, argv, options_string, long_options,
                        &option_index);

        // no more options
        if (c == -1)
            break;

        switch (c) {
        case 'v':
            printf("progress version %s\n", PROGRESS_VERSION);
            exit(EXIT_SUCCESS);
            break;
        case 'q':
            printf("hit q\n");
            break;
        case 'W':
            printf("hit W %s\n", optarg);
            break;
        case 'h':
            printf("help %s\n", argv[0]);
            exit(EXIT_SUCCESS);
            break;
        case '?':
        default:
            exit(EXIT_FAILURE);
        }
    }

    if (optind < argc) {
        fprintf(stderr, "Invalid arguments.\n");
        exit(EXIT_FAILURE);
    }
}


int main(int argc, char const *argv[])
{
    parse_options(argc, argv);
    return 0;
}