int main()

in installer/myodbc-installer.cc [782:918]
117 lines of code
33 McCabe index (conditional complexity)

int main(int argc, char **argv)
{
  char *arg;
  int i;
  SQLINTEGER convlen;

  /* minimum number of args to do anything useful */
  if (argc < 3)
  {
    if (argc == 2)
    {
      arg= argv[1]; /* check for help option */
      if (*arg == '-' && *(arg + 1) == ACTION_HELP)
      {
        main_usage(stdout);
        return 1;
      }
    }

    fprintf(stderr, "[ERROR] Not enough arguments given\n");
    main_usage(stderr);
    return 1;
  }

  /* parse args */
  for(i= 1; i < argc; ++i)
  {
    arg= argv[i];
    if (*arg == '-')
      arg++;

    /* we should be left with a single character option (except scope)
     * all strings are skipped by the respective option below */
    if (*arg != OPT_SCOPE && *(arg + 1))
    {
      fprintf(stderr, "[ERROR] Invalid command line option: %s\n", arg);
      return 1;
    }

    switch (*arg)
    {
    case OBJ_DRIVER:
    case OBJ_DATASOURCE:
      /* make sure we haven't already assigned the object */
      if (obj)
      {
        object_usage();
        return 1;
      }
      obj= *arg;
      break;
    case ACTION_LIST:
    case ACTION_ADD:
    case ACTION_REMOVE:
      if (action)
      {
        action_usage();
        return 1;
      }
      action= *arg;
      break;
    case OPT_DSN:
      if (i + 1 == argc || *argv[i + 1] == '-')
      {
        fprintf(stderr, "[ERROR] Missing name\n");
        return 1;
      }
      name= argv[++i];
      break;
    case OPT_ATTR:
      if (i + 1 == argc || *argv[i + 1] == '-')
      {
        fprintf(stderr, "[ERROR] Missing attribute string\n");
        return 1;
      }
      attrstr= argv[++i];
      break;
    case OPT_SCOPE:
      /* convert to integer */
      scope= *(++arg) - '0';
      if (scope > 2 || *(arg + 1) /* another char exists */)
      {
        fprintf(stderr, "[ERROR] Invalid scope: %s\n", arg);
        return 1;
      }
      break;
    case ACTION_HELP:
      /* print usage if -h is given anywhere */
      main_usage(stdout);
      return 1;
    default:
      fprintf(stderr, "[ERROR] Invalid command line option: %s\n", arg);
      return 1;
    }
  }

  if (!action)
  {
    action_usage();
    return 1;
  }

  /* init libmysqlclient */
  my_sys_init();
  utf8_charset_info= myodbc::get_charset_by_csname(transport_charset, MYF(MY_CS_PRIMARY),
                                           MYF(0));

  /* convert to SQLWCHAR for installer API */
  convlen= SQL_NTS;
  if (name && !(wname= sqlchar_as_sqlwchar(myodbc::default_charset_info,
                                           (SQLCHAR *)name, &convlen, NULL)))
  {
    fprintf(stderr, "[ERROR] Name is invalid\n");
    return 1;
  }

  convlen= SQL_NTS;
  if (attrstr && !(wattrs= sqlchar_as_sqlwchar(myodbc::default_charset_info,
                                               (SQLCHAR *)attrstr, &convlen,
                                               NULL)))
  {
    fprintf(stderr, "[ERROR] Attribute string is invalid\n");
    return 1;
  }

  /* handle appropriate action */
  switch (obj)
  {
  case OBJ_DRIVER:
    return handle_driver_action();
  case OBJ_DATASOURCE:
    return handle_datasource_action();
  default:
    object_usage();
    return 1;
  }
}