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/* keystatus.c - Command to check key modifier status. */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2009 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/dl.h>
#include <grub/misc.h>
#include <grub/extcmd.h>
#include <grub/term.h>
#include <grub/i18n.h>
GRUB_MOD_LICENSE ("GPLv3+");
static const struct grub_arg_option options[] =
{
/* TRANSLATORS: "Check" in a sense that if this key is pressed then
"true" is returned, otherwise "false". */
{"shift", 's', 0, N_("Check Shift key."), 0, 0},
{"ctrl", 'c', 0, N_("Check Control key."), 0, 0},
{"alt", 'a', 0, N_("Check Alt key."), 0, 0},
{0, 0, 0, 0, 0, 0}
};
static grub_err_t
grub_cmd_keystatus (grub_extcmd_context_t ctxt,
int argc __attribute__ ((unused)),
char **args __attribute__ ((unused)))
{
struct grub_arg_list *state = ctxt->state;
int expect_mods = 0;
int mods;
if (state[0].set)
expect_mods |= (GRUB_TERM_STATUS_LSHIFT | GRUB_TERM_STATUS_RSHIFT);
if (state[1].set)
expect_mods |= (GRUB_TERM_STATUS_LCTRL | GRUB_TERM_STATUS_RCTRL);
if (state[2].set)
expect_mods |= (GRUB_TERM_STATUS_LALT | GRUB_TERM_STATUS_RALT);
grub_dprintf ("keystatus", "expect_mods: %d\n", expect_mods);
/* Without arguments, just check whether getkeystatus is supported at
all. */
if (expect_mods == 0)
{
grub_term_input_t term;
int nterms = 0;
FOR_ACTIVE_TERM_INPUTS (term)
if (!term->getkeystatus)
return grub_error (GRUB_ERR_TEST_FAILURE, N_("false"));
else
nterms++;
if (!nterms)
return grub_error (GRUB_ERR_TEST_FAILURE, N_("false"));
return 0;
}
mods = grub_getkeystatus ();
grub_dprintf ("keystatus", "mods: %d\n", mods);
if (mods >= 0 && (mods & expect_mods) != 0)
return 0;
else
return grub_error (GRUB_ERR_TEST_FAILURE, N_("false"));
}
static grub_extcmd_t cmd;
GRUB_MOD_INIT(keystatus)
{
cmd = grub_register_extcmd ("keystatus", grub_cmd_keystatus, 0,
"[--shift] [--ctrl] [--alt]",
/* TRANSLATORS: there are 3 modifiers. */
N_("Check key modifier status."),
options);
}
GRUB_MOD_FINI(keystatus)
{
grub_unregister_extcmd (cmd);
}
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