1 files changed, 45 insertions, 0 deletions

diff --git a/common/layer_stack.h b/common/layer_stack.h
new file mode 100644
index 000000000..25bf37a5b
--- /dev/null
+++ b/common/layer_stack.h
@@ -0,0 +1,45 @@
+/*
+Copyright 2013 Jun Wako <wakojun@gmail.com>
+
+This program 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 2 of the License, or
+(at your option) any later version.
+
+This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#ifndef LAYER_STACK_H
+#define LAYER_STACK_H
+
+#include <stdint.h>
+#include "action.h"
+
+
+/*
+ * Layer stack
+ */
+#define LAYER_STACK_SIZE 8
+typedef struct {
+    uint8_t layer:4;
+    uint8_t next:3;
+    bool    used;
+} layer_item_t;
+
+
+void layer_stack_clear(void);
+bool layer_stack_push(uint8_t layer);
+bool layer_stack_pop(void);
+bool layer_stack_remove(uint8_t layer);
+bool layer_stack_remove_then_push(uint8_t layer);
+bool layer_stack_remove_or_push(uint8_t layer);
+void layer_stack_debug(void);
+action_t layer_stack_get_action(key_t key);
+
+#endif
+