1 files changed, 52 insertions, 0 deletions
diff --git a/sway/key_state.c b/sway/key_state.c
new file mode 100644
index 00000000..76561dbc
--- /dev/null
+++ b/sway/key_state.c
@@ -0,0 +1,52 @@
+#include <string.h>
+#include <stdbool.h>
+#include <ctype.h>
+
+#include "key_state.h"
+
+enum { KEY_STATE_MAX_LENGTH = 64 };
+
+static keycode key_state_array[KEY_STATE_MAX_LENGTH];
+static uint8_t key_state_length = 0;
+
+static uint8_t find_key(keycode key)
+{
+	int i;
+	for (i = 0; i < key_state_length; ++i)
+	{
+		if (key_state_array[i] == key)
+		{
+			break;
+		}
+	}
+	return i;
+}
+
+bool check_key(keycode key)
+{
+	return find_key(key) < key_state_length;
+}
+
+void press_key(keycode key)
+{
+	// Check if key exists
+	if (!check_key(key))
+	{
+		// Check that we dont exceed buffer length
+		if (key_state_length < KEY_STATE_MAX_LENGTH) {
+			key_state_array[key_state_length++] = key;
+		}
+	}
+}
+
+void release_key(keycode key)
+{
+	uint8_t index = find_key(key);
+	if (index < key_state_length)
+	{
+		//shift it over and remove key
+		memmove(&key_state_array[index],
+				&key_state_array[index + 1],
+				sizeof(*key_state_array) * (--key_state_length - index));
+	}
+}