1 files changed, 95 insertions, 0 deletions
diff --git a/grub-core/commands/keystatus.c b/grub-core/commands/keystatus.c
new file mode 100644
index 0000000..ff3f587
--- /dev/null
+++ b/grub-core/commands/keystatus.c
@@ -0,0 +1,95 @@
+/* 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);
+}