manual/examples/subopt.c

   1 /* Parsing of Suboptions Example
   2    Copyright (C) 1991-2014 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU General Public License
   6    as published by the Free Software Foundation; either version 2
   7    of the License, or (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, if not, see <http://www.gnu.org/licenses/>.
  16 */
  17
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <unistd.h>
  21
  22 int do_all;
  23 const char *type;
  24 int read_size;
  25 int write_size;
  26 int read_only;
  27
  28 enum
  29 {
  30   RO_OPTION = 0,
  31   RW_OPTION,
  32   READ_SIZE_OPTION,
  33   WRITE_SIZE_OPTION,
  34   THE_END
  35 };
  36
  37 const char *mount_opts[] =
  38 {
  39   [RO_OPTION] = "ro",
  40   [RW_OPTION] = "rw",
  41   [READ_SIZE_OPTION] = "rsize",
  42   [WRITE_SIZE_OPTION] = "wsize",
  43   [THE_END] = NULL
  44 };
  45
  46 int
  47 main (int argc, char **argv)
  48 {
  49   char *subopts, *value;
  50   int opt;
  51
  52   while ((opt = getopt (argc, argv, "at:o:")) != -1)
  53     switch (opt)
  54       {
  55       case 'a':
  56         do_all = 1;
  57         break;
  58       case 't':
  59         type = optarg;
  60         break;
  61       case 'o':
  62         subopts = optarg;
  63         while (*subopts != '\0')
  64           switch (getsubopt (&subopts, mount_opts, &value))
  65             {
  66             case RO_OPTION:
  67               read_only = 1;
  68               break;
  69             case RW_OPTION:
  70               read_only = 0;
  71               break;
  72             case READ_SIZE_OPTION:
  73               if (value == NULL)
  74                 abort ();
  75               read_size = atoi (value);
  76               break;
  77             case WRITE_SIZE_OPTION:
  78               if (value == NULL)
  79                 abort ();
  80               write_size = atoi (value);
  81               break;
  82             default:
  83               /* Unknown suboption.  */
  84               printf ("Unknown suboption `%s'\n", value);
  85               break;
  86             }
  87         break;
  88       default:
  89         abort ();
  90       }
  91
  92   /* Do the real work.  */
  93
  94   return 0;
  95 }