commands/handler.c

   1 /* handler.c - commands to list or select handlers */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2009  Free Software Foundation, Inc.
   5  *
   6  *  GRUB is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  GRUB is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <grub/dl.h>
  21 #include <grub/err.h>
  22 #include <grub/misc.h>
  23 #include <grub/term.h>
  24 #include <grub/handler.h>
  25 #include <grub/command.h>
  26
  27 static grub_err_t
  28 grub_cmd_handler (struct grub_command *cmd,
  29                   int argc, char **args)
  30 {
  31   char *class_name;
  32   void *curr_item = 0;
  33   grub_handler_class_t head;
  34
  35   auto int list_item (grub_named_list_t item);
  36   int list_item (grub_named_list_t item)
  37     {
  38       if (item == curr_item)
  39         grub_putchar ('*');
  40
  41       grub_printf ("%s\n", item->name);
  42
  43       return 0;
  44     }
  45
  46   class_name = (grub_strcmp (cmd->name, "handler")) ? (char *) cmd->name : 0;
  47
  48   head = grub_handler_class_list;
  49   if ((argc == 0) && (class_name == 0))
  50     {
  51       grub_list_iterate (GRUB_AS_LIST (head), (grub_list_hook_t) list_item);
  52     }
  53   else
  54     {
  55       grub_handler_class_t class;
  56
  57       if (class_name == 0)
  58         {
  59           class_name = args[0];
  60           argc--;
  61           args++;
  62         }
  63
  64       class = grub_named_list_find (GRUB_AS_NAMED_LIST (head), class_name);
  65       if (! class)
  66         return grub_error (GRUB_ERR_FILE_NOT_FOUND, "class not found");
  67
  68       if (argc == 0)
  69         {
  70           curr_item = class->cur_handler;
  71           grub_list_iterate (GRUB_AS_LIST (class->handler_list),
  72                              (grub_list_hook_t) list_item);
  73         }
  74       else
  75         {
  76           grub_handler_t handler;
  77
  78           handler =
  79             grub_named_list_find (GRUB_AS_NAMED_LIST (class->handler_list),
  80                                   args[0]);
  81
  82           if (! handler)
  83             return grub_error (GRUB_ERR_FILE_NOT_FOUND, "handler not found");
  84
  85           grub_handler_set_current (class, handler);
  86         }
  87     }
  88
  89   return 0;
  90 }
  91
  92 static grub_command_t cmd_handler, cmd_terminal_input, cmd_terminal_output;
  93
  94 GRUB_MOD_INIT(handler)
  95 {
  96   cmd_handler =
  97     grub_register_command ("handler", grub_cmd_handler,
  98                            "handler [class [handler]]",
  99                            "List or select a handler");
 100   cmd_terminal_input =
 101     grub_register_command ("terminal_input", grub_cmd_handler,
 102                            "terminal_input [handler]",
 103                            "List or select a handler");
 104   cmd_terminal_output =
 105     grub_register_command ("terminal_output", grub_cmd_handler,
 106                            "terminal_output [handler]",
 107                            "List or select a handler");
 108 }
 109
 110 GRUB_MOD_FINI(handler)
 111 {
 112   grub_unregister_command (cmd_handler);
 113   grub_unregister_command (cmd_terminal_input);
 114   grub_unregister_command (cmd_terminal_output);
 115 }