getopt POSIX for clamav-realtime.c

hello_world.c

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

/* Define version */
static const char version[] = "0.0.3";

/* Flag set by ‘--verbose’. */
static int verbose_flag;
/*
* Show brief command usage help:
*/
static void print_usage() {
fputs("Usage: [hvVCdlp] [-h | --help] [-v | --verbose] [-V | --version] [-C | --config CONFIG_PATH] [-d | --directory DIRECTORY_TARGET] [-l | --log LOGFILE] [-p | --pid PIDFILE]\n",stderr);
fputs("\t-h (or --help)\t\t\tGives this help display\n",stderr);
fputs("\t-v (or --verbose)\t\tBe verbose\n",stderr);
fputs("\t-V (or --version)\t\tDisplays program version.\n",stderr);
fputs("\t-C (or --config=CONFIGFILE)\tSetup configuration file path\n",stderr);
fputs("\t-d (or --directory=DIRECTORY_TARGET)\tSetup target directory\n",stderr);
fputs("\t-l (or --log=LOGFILE)\t\tSetup log file path\n",stderr);
fputs("\t-p (or --pid=PIDFILE)\t\tSetup PID path\n",stderr);
}

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

  while (1)
    {
      static struct option long_options[] =
        {
          /* These options set a flag. */
          {"verbose", no_argument, &verbose_flag, 1}, /* verbose flag set */
          {"help", no_argument, 0, 'h'},
          {"version", no_argument, 0, 'V'},
          /* These options don’t set a flag.
             We distinguish them by their indices. */
          {"config",  required_argument, 0, 'C'},
          {"directory",  required_argument, 0, 'd'},
          {"log",    required_argument, 0, 'l'},
          {"pid",  required_argument, 0, 'p'},
          {0, 0, 0, 0}
        };
      /* getopt_long stores the option index here. */
      int option_index = 0;

      c = getopt_long (argc, argv, "C:d:l:p:hvV",
                       long_options, &option_index);

      /* Detect the end of the options. */
      if (c == -1)
        break;

      switch (c)
        {
        case 0:
          /* If this option set a flag, do nothing else now. */
          if (long_options[option_index].flag != 0)
            break;
          printf ("option %s", long_options[option_index].name);
          if (optarg)
            printf (" with arg %s", optarg);
          printf ("\n");
          break;

        case 'C':
          printf ("set config from `%s'\n", optarg);
          break;

        case 'd':
          printf ("set directory target to `%s'\n", optarg);
          break;

        case 'h':
         print_usage();
	 break;

        case 'l':
          printf ("set log path to `%s'\n", optarg);
          break;

        case 'p':
          printf ("set pid path to `%s'\n", optarg);
          break;
	case 'v':
	  printf ("Be verbose \n");
	  int verbose_flag = 1;
	  if (verbose_flag)
	  puts ("verbose flag is set");
	  break;

        case 'V':
	  fprintf (stderr,"This is clamav-realtime version %s\n",version);
          break;

        case '?':
          /* getopt_long already printed an error message. */
          break;

        default:
	  print_usage();
          abort ();
        }
    }

  /* Instead of reporting ‘--verbose’
     and ‘--brief’ as they are encountered,
     we report the final status resulting from them. */
  // if (verbose_flag)
  //  puts ("verbose flag is set");

  /* Print any remaining command line arguments (not options). */
  if (optind < argc)
    {
      printf ("non-option ARGV-elements: ");
      while (optind < argc)
        printf ("%s ", argv[optind++]);
      putchar ('\n');
    }
  exit (0);
}