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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 int
- grub_getkeystatus (void)
- {
- int status = 0;
- grub_term_input_t term;
- if (grub_term_poll_usb)
- grub_term_poll_usb (0);
- FOR_ACTIVE_TERM_INPUTS(term)
- {
- if (term->getkeystatus)
- status |= term->getkeystatus (term);
- }
- return status;
- }
- 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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