posix/tstgetopt.c

   1 #include <unistd.h>
   2 #include <stdio.h>
   3 #include <getopt.h>
   4
   5 int
   6 main (int argc, char **argv)
   7 {
   8   static const struct option options[] =
   9     {
  10       {"required", required_argument, NULL, 'r'},
  11       {"optional", optional_argument, NULL, 'o'},
  12       {"none",     no_argument,       NULL, 'n'},
  13       {NULL,       0,                 NULL, 0 }
  14     };
  15
  16   int aflag = 0;
  17   int bflag = 0;
  18   char *cvalue = NULL;
  19   int index;
  20   int c;
  21
  22   while ((c = getopt_long (argc, argv, "abc:", options, NULL)) >= 0)
  23     switch (c)
  24       {
  25       case 'a':
  26         aflag = 1;
  27         break;
  28       case 'b':
  29         bflag = 1;
  30         break;
  31       case 'c':
  32         cvalue = optarg;
  33         break;
  34       case '?':
  35         fputs ("Unknown option.\n", stderr);
  36         return 1;
  37       default:
  38         fprintf (stderr, "This should never happen!\n");
  39         return 1;
  40
  41       case 'r':
  42         printf ("--required %s\n", optarg);
  43         break;
  44       case 'o':
  45         printf ("--optional %s\n", optarg);
  46         break;
  47       case 'n':
  48         puts ("--none");
  49         break;
  50       }
  51
  52   printf ("aflag = %d, bflag = %d, cvalue = %s\n", aflag, bflag, cvalue);
  53
  54   for (index = optind; index < argc; index++)
  55     printf ("Non-option argument %s\n", argv[index]);
  56
  57   return 0;
  58 }