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