/*
 * Example getopt usage mostly from getopt(3)
 */
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <libgen.h>


void die_usage(char *prog, char *msg) {
    fprintf(stderr, "Usage: %s [-t nsecs] [-n] name\n", prog);
    if (msg != NULL) {
        fprintf(stderr, "%s\n", msg);
    }
    exit(EXIT_FAILURE);
}


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

    nsecs = 0;
    tfnd = 0;
    flags = 0;
    prog = basename(argv[0]);

    while ((opt = getopt(argc, argv, "hnt:")) != -1) {
        switch (opt) {
        case 'n':
            flags = 1;
            break;
        case 't':
            nsecs = atoi(optarg);
            tfnd = 1;
            break;
        case 'h':
        default: /* '?' */
            die_usage(prog, NULL);
        }
    }

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

    if (optind >= argc) {
        die_usage(prog, "Expected argument after options");
    }

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

    exit(EXIT_SUCCESS);
}