arch/all-pc/boot/grub2-aros/grub-core/commands/keystatus.c

   1 /* keystatus.c - Command to check key modifier status.  */
   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/misc.h>
  22 #include <grub/extcmd.h>
  23 #include <grub/term.h>
  24 #include <grub/i18n.h>
  25
  26 GRUB_MOD_LICENSE ("GPLv3+");
  27
  28 static const struct grub_arg_option options[] =
  29   {
  30     /* TRANSLATORS: "Check" in a sense that if this key is pressed then
  31        "true" is returned, otherwise "false".  */
  32     {"shift", 's', 0, N_("Check Shift key."), 0, 0},
  33     {"ctrl", 'c', 0, N_("Check Control key."), 0, 0},
  34     {"alt", 'a', 0, N_("Check Alt key."), 0, 0},
  35     {0, 0, 0, 0, 0, 0}
  36   };
  37
  38 static int
  39 grub_getkeystatus (void)
  40 {
  41   int status = 0;
  42   grub_term_input_t term;
  43
  44   if (grub_term_poll_usb)
  45     grub_term_poll_usb (0);
  46
  47   FOR_ACTIVE_TERM_INPUTS(term)
  48   {
  49     if (term->getkeystatus)
  50       status |= term->getkeystatus (term);
  51   }
  52
  53   return status;
  54 }
  55
  56 static grub_err_t
  57 grub_cmd_keystatus (grub_extcmd_context_t ctxt,
  58                     int argc __attribute__ ((unused)),
  59                     char **args __attribute__ ((unused)))
  60 {
  61   struct grub_arg_list *state = ctxt->state;
  62   int expect_mods = 0;
  63   int mods;
  64
  65   if (state[0].set)
  66     expect_mods |= (GRUB_TERM_STATUS_LSHIFT | GRUB_TERM_STATUS_RSHIFT);
  67   if (state[1].set)
  68     expect_mods |= (GRUB_TERM_STATUS_LCTRL | GRUB_TERM_STATUS_RCTRL);
  69   if (state[2].set)
  70     expect_mods |= (GRUB_TERM_STATUS_LALT | GRUB_TERM_STATUS_RALT);
  71
  72   grub_dprintf ("keystatus", "expect_mods: %d\n", expect_mods);
  73
  74   /* Without arguments, just check whether getkeystatus is supported at
  75      all.  */
  76   if (expect_mods == 0)
  77     {
  78       grub_term_input_t term;
  79       int nterms = 0;
  80
  81       FOR_ACTIVE_TERM_INPUTS (term)
  82         if (!term->getkeystatus)
  83           return grub_error (GRUB_ERR_TEST_FAILURE, N_("false"));
  84         else
  85           nterms++;
  86       if (!nterms)
  87         return grub_error (GRUB_ERR_TEST_FAILURE, N_("false"));
  88       return 0;
  89     }
  90
  91   mods = grub_getkeystatus ();
  92   grub_dprintf ("keystatus", "mods: %d\n", mods);
  93   if (mods >= 0 && (mods & expect_mods) != 0)
  94     return 0;
  95   else
  96     return grub_error (GRUB_ERR_TEST_FAILURE, N_("false"));
  97 }
  98
  99 static grub_extcmd_t cmd;
 100 \f
 101 GRUB_MOD_INIT(keystatus)
 102 {
 103   cmd = grub_register_extcmd ("keystatus", grub_cmd_keystatus, 0,
 104                               "[--shift] [--ctrl] [--alt]",
 105                               /* TRANSLATORS: there are 3 modifiers.  */
 106                               N_("Check key modifier status."),
 107                               options);
 108 }
 109
 110 GRUB_MOD_FINI(keystatus)
 111 {
 112   grub_unregister_extcmd (cmd);
 113 }