1 files changed, 143 insertions, 0 deletions
diff --git a/ui/kbd-state.c b/ui/kbd-state.c
new file mode 100644
index 0000000000..52ed28b8a8
--- /dev/null
+++ b/ui/kbd-state.c
@@ -0,0 +1,143 @@
+/*
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * (at your option) any later version.  See the COPYING file in the
+ * top-level directory.
+ */
+#include "qemu/osdep.h"
+#include "qemu/bitmap.h"
+#include "ui/console.h"
+#include "ui/input.h"
+#include "ui/kbd-state.h"
+
+struct QKbdState {
+    QemuConsole *con;
+    int key_delay_ms;
+    DECLARE_BITMAP(keys, Q_KEY_CODE__MAX);
+    DECLARE_BITMAP(mods, QKBD_MOD__MAX);
+};
+
+static void qkbd_state_modifier_update(QKbdState *kbd,
+                                      QKeyCode qcode1, QKeyCode qcode2,
+                                      QKbdModifier mod)
+{
+    if (test_bit(qcode1, kbd->keys) || test_bit(qcode2, kbd->keys)) {
+        set_bit(mod, kbd->mods);
+    } else {
+        clear_bit(mod, kbd->mods);
+    }
+}
+
+bool qkbd_state_modifier_get(QKbdState *kbd, QKbdModifier mod)
+{
+    return test_bit(mod, kbd->mods);
+}
+
+bool qkbd_state_key_get(QKbdState *kbd, QKeyCode qcode)
+{
+    return test_bit(qcode, kbd->keys);
+}
+
+void qkbd_state_key_event(QKbdState *kbd, QKeyCode qcode, bool down)
+{
+    bool state = test_bit(qcode, kbd->keys);
+
+    if (down == false  /* got key-up event   */ &&
+        state == false /* key is not pressed */) {
+        /*
+         * Filter out suspicious key-up events.
+         *
+         * This allows simply sending along all key-up events, and
+         * this function will filter out everything where the
+         * corresponding key-down event wasn't sent to the guest, for
+         * example due to being a host hotkey.
+         *
+         * Note that key-down events on already pressed keys are *not*
+         * suspicious, those are keyboard autorepeat events.
+         */
+        return;
+    }
+
+    /* update key and modifier state */
+    if (down) {
+        set_bit(qcode, kbd->keys);
+    } else {
+        clear_bit(qcode, kbd->keys);
+    }
+    switch (qcode) {
+    case Q_KEY_CODE_SHIFT:
+    case Q_KEY_CODE_SHIFT_R:
+        qkbd_state_modifier_update(kbd, Q_KEY_CODE_SHIFT, Q_KEY_CODE_SHIFT_R,
+                                   QKBD_MOD_SHIFT);
+        break;
+    case Q_KEY_CODE_CTRL:
+    case Q_KEY_CODE_CTRL_R:
+        qkbd_state_modifier_update(kbd, Q_KEY_CODE_CTRL, Q_KEY_CODE_CTRL_R,
+                                   QKBD_MOD_CTRL);
+        break;
+    case Q_KEY_CODE_ALT:
+        qkbd_state_modifier_update(kbd, Q_KEY_CODE_ALT, Q_KEY_CODE_ALT,
+                                   QKBD_MOD_ALT);
+        break;
+    case Q_KEY_CODE_ALT_R:
+        qkbd_state_modifier_update(kbd, Q_KEY_CODE_ALT_R, Q_KEY_CODE_ALT_R,
+                                   QKBD_MOD_ALTGR);
+        break;
+    case Q_KEY_CODE_CAPS_LOCK:
+        if (down) {
+            change_bit(QKBD_MOD_CAPSLOCK, kbd->mods);
+        }
+        break;
+    case Q_KEY_CODE_NUM_LOCK:
+        if (down) {
+            change_bit(QKBD_MOD_NUMLOCK, kbd->mods);
+        }
+        break;
+    default:
+        /* keep gcc happy */
+        break;
+    }
+
+    /* send to guest */
+    if (qemu_console_is_graphic(kbd->con)) {
+        qemu_input_event_send_key_qcode(kbd->con, qcode, down);
+        if (kbd->key_delay_ms) {
+            qemu_input_event_send_key_delay(kbd->key_delay_ms);
+        }
+    }
+}
+
+void qkbd_state_lift_all_keys(QKbdState *kbd)
+{
+    int qcode;
+
+    for (qcode = 0; qcode < Q_KEY_CODE__MAX; qcode++) {
+        if (test_bit(qcode, kbd->keys)) {
+            qkbd_state_key_event(kbd, qcode, false);
+        }
+    }
+}
+
+void qkbd_state_switch_console(QKbdState *kbd, QemuConsole *con)
+{
+    qkbd_state_lift_all_keys(kbd);
+    kbd->con = con;
+}
+
+void qkbd_state_set_delay(QKbdState *kbd, int delay_ms)
+{
+    kbd->key_delay_ms = delay_ms;
+}
+
+void qkbd_state_free(QKbdState *kbd)
+{
+    g_free(kbd);
+}
+
+QKbdState *qkbd_state_init(QemuConsole *con)
+{
+    QKbdState *kbd = g_new0(QKbdState, 1);
+
+    kbd->con = con;
+
+    return kbd;
+}