manual/examples/subopt.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3
   4 int do_all;
   5 const char *type;
   6 int read_size;
   7 int write_size;
   8 int read_only;
   9
  10 enum
  11 {
  12   RO_OPTION = 0,
  13   RW_OPTION,
  14   READ_SIZE_OPTION,
  15   WRITE_SIZE_OPTION
  16 };
  17
  18 const char *mount_opts[] =
  19 {
  20   [RO_OPTION] = "ro",
  21   [RW_OPTION] = "rw",
  22   [READ_SIZE_OPTION] = "rsize",
  23   [WRITE_SIZE_OPTION] = "wsize"
  24 };
  25
  26 int
  27 main (int argc, char *argv[])
  28 {
  29   char *subopts, *value;
  30   int opt;
  31
  32   while ((opt = getopt (argc, argv, "at:o:")) != EOF)
  33     switch (opt)
  34       {
  35       case 'a':
  36         do_all = 1;
  37         break;
  38       case 't':
  39         type = optarg;
  40         break;
  41       case 'o':
  42         subopts = optarg;
  43         while (*subopts != '\0')
  44           switch (getsubopt (&subopts, mount_opts, &value))
  45             {
  46             case RO_OPTION:
  47               read_only = 1;
  48               break;
  49             case RW_OPTION:
  50               read_only = 0;
  51               break;
  52             case READ_SIZE_OPTION:
  53               if (value == NULL)
  54                 abort ();
  55               read_size = atoi (value);
  56               break;
  57             case WRITE_SIZE_OPTION:
  58               if (value == NULL)
  59                 abort ();
  60               write_size = atoi (value);
  61               break;
  62             default:
  63               /* Unknown suboption.  */
  64               printf ("Unknown suboption `%s'\n", value);
  65               break;
  66             }
  67         break;
  68       default:
  69         abort ();
  70       }
  71
  72   /* Do the real work.  */
  73
  74   return 0;
  75 }