manual/examples/testopt.c

   1 /*@group*/
   2 #include <ctype.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <unistd.h>
   6
   7 int
   8 main (int argc, char **argv)
   9 {
  10   int aflag = 0;
  11   int bflag = 0;
  12   char *cvalue = NULL;
  13   int index;
  14   int c;
  15
  16   opterr = 0;
  17 /*@end group*/
  18
  19 /*@group*/
  20   while ((c = getopt (argc, argv, "abc:")) != -1)
  21     switch (c)
  22       {
  23       case 'a':
  24         aflag = 1;
  25         break;
  26       case 'b':
  27         bflag = 1;
  28         break;
  29       case 'c':
  30         cvalue = optarg;
  31         break;
  32       case '?':
  33         if (optopt == 'c')
  34           fprintf (stderr, "Option -%c requires an argument.\n", optopt);
  35         else if (isprint (optopt))
  36           fprintf (stderr, "Unknown option `-%c'.\n", optopt);
  37         else
  38           fprintf (stderr,
  39                    "Unknown option character `\\x%x'.\n",
  40                    optopt);
  41         return 1;
  42       default:
  43         abort ();
  44       }
  45 /*@end group*/
  46
  47 /*@group*/
  48   printf ("aflag = %d, bflag = %d, cvalue = %s\n",
  49           aflag, bflag, cvalue);
  50
  51   for (index = optind; index < argc; index++)
  52     printf ("Non-option argument %s\n", argv[index]);
  53   return 0;
  54 }
  55 /*@end group*/