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