+static void version_command(const char *command_name, int major_version, int minor_version)
+{
+ std::cout << command_name << " " << major_version << "." << minor_version << std::endl;
+}
+
+static void help_command(const char *command_name,
+ int major_version, int minor_version,
+ const struct option *long_options)
+{
+ std::cout << command_name << " " << major_version << "." << minor_version << std::endl;
+ std::cout << "Current options. A '=' means the option takes a value." << std::endl << std::endl;
+
+ for (uint32_t x= 0; long_options[x].name; x++)
+ {
+ std::cout << "\t --" << long_options[x].name << char(long_options[x].has_arg ? '=' : ' ') << std::endl;
+ }
+
+ std::cout << std::endl;
+}
+
+static void close_stdio(void)
+{
+ int fd;
+ if ((fd = open("/dev/null", O_RDWR, 0)) < 0)
+ {
+ return;
+ }
+ else
+ {
+ if (dup2(fd, STDIN_FILENO) < 0)
+ {
+ return;
+ }
+
+ if (dup2(fd, STDOUT_FILENO) < 0)
+ {
+ return;
+ }
+
+ if (dup2(fd, STDERR_FILENO) < 0)
+ {
+ return;
+ }
+
+ if (fd > STDERR_FILENO)
+ {
+ close(fd);
+ }
+ }
+}
+
+enum {
+ OPT_HELP,
+ OPT_QUIET,
+ OPT_VERSION
+};
+
+static void options_parse(int argc, char *argv[])
+{
+ static struct option long_options[]=
+ {
+ { "version", no_argument, NULL, OPT_VERSION},
+ { "help", no_argument, NULL, OPT_HELP},
+ { "quiet", no_argument, NULL, OPT_QUIET},
+ {0, 0, 0, 0},
+ };
+
+ bool opt_version= false;
+ bool opt_help= false;
+ bool opt_quiet= false;
+ int option_index= 0;
+
+ while (1)
+ {
+ int option_rv= getopt_long(argc, argv, "", long_options, &option_index);
+ if (option_rv == -1)
+ {
+ break;
+ }
+
+ switch (option_rv)
+ {
+ case OPT_HELP: /* --help or -h */
+ opt_help= true;
+ break;
+
+ case OPT_VERSION: /* --version or -v */
+ opt_version= true;
+ break;
+
+ case OPT_QUIET:
+ opt_quiet= true;
+ break;
+
+ case '?':
+ /* getopt_long already printed an error message. */
+ exit(EXIT_FAILURE);
+
+ default:
+ help_command(argv[0], 1, 0, long_options);
+ exit(EXIT_FAILURE);
+ }
+ }
+
+ if (opt_quiet)
+ {
+ close_stdio();
+ }
+
+ if (opt_version)
+ {
+ version_command(argv[0], 1, 0);
+ exit(EXIT_SUCCESS);
+ }
+
+ if (opt_help)
+ {
+ help_command(argv[0], 1, 0, long_options);
+ exit(EXIT_SUCCESS);
+ }
+}
+