manual/examples/subopt.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <unistd.h>
   4
   5 int do_all;
   6 const char *type;
   7 int read_size;
   8 int write_size;
   9 int read_only;
  10
  11 enum
  12 {
  13   RO_OPTION = 0,
  14   RW_OPTION,
  15   READ_SIZE_OPTION,
  16   WRITE_SIZE_OPTION,
  17   THE_END
  18 };
  19
  20 const char *mount_opts[] =
  21 {
  22   [RO_OPTION] = "ro",
  23   [RW_OPTION] = "rw",
  24   [READ_SIZE_OPTION] = "rsize",
  25   [WRITE_SIZE_OPTION] = "wsize",
  26   [THE_END] = NULL
  27 };
  28
  29 int
  30 main (int argc, char *argv[])
  31 {
  32   char *subopts, *value;
  33   int opt;
  34
  35   while ((opt = getopt (argc, argv, "at:o:")) != -1)
  36     switch (opt)
  37       {
  38       case 'a':
  39         do_all = 1;
  40         break;
  41       case 't':
  42         type = optarg;
  43         break;
  44       case 'o':
  45         subopts = optarg;
  46         while (*subopts != '\0')
  47           switch (getsubopt (&subopts, mount_opts, &value))
  48             {
  49             case RO_OPTION:
  50               read_only = 1;
  51               break;
  52             case RW_OPTION:
  53               read_only = 0;
  54               break;
  55             case READ_SIZE_OPTION:
  56               if (value == NULL)
  57                 abort ();
  58               read_size = atoi (value);
  59               break;
  60             case WRITE_SIZE_OPTION:
  61               if (value == NULL)
  62                 abort ();
  63               write_size = atoi (value);
  64               break;
  65             default:
  66               /* Unknown suboption.  */
  67               printf ("Unknown suboption `%s'\n", value);
  68               break;
  69             }
  70         break;
  71       default:
  72         abort ();
  73       }
  74
  75   /* Do the real work.  */
  76
  77   return 0;
  78 }