input manager

1 files changed, 93 insertions, 0 deletions

diff --git a/kernel/input.c b/kernel/input.c
new file mode 100644
index 0000000..2073950
--- /dev/null
+++ b/kernel/input.c
@@ -0,0 +1,93 @@
+#include <comus/input.h>
+
+struct mouse_event_buf {
+	struct mouse_event data[N_MOUSEEV];
+	size_t start;
+	size_t end;
+	size_t len;
+};
+
+struct keycode_buf {
+	struct keycode data[N_KEYCODE];
+	size_t start;
+	size_t end;
+	size_t len;
+};
+
+static struct keycode_buf keycode_buffer = {
+	.start = 0,
+	.end = 0,
+	.len = 0,
+};
+
+static struct mouse_event_buf mouse_event_buffer = {
+	.start = 0,
+	.end = 0,
+	.len = 0,
+};
+
+void keycode_push(struct keycode *ev)
+{
+	// save keycode
+	keycode_buffer.data[keycode_buffer.end] = *ev;
+
+	// update pointers
+	keycode_buffer.end++;
+	keycode_buffer.end %= N_KEYCODE;
+	if (keycode_buffer.len < N_KEYCODE) {
+		keycode_buffer.len++;
+	} else {
+		keycode_buffer.start++;
+		keycode_buffer.start %= N_KEYCODE;
+	}
+}
+
+int keycode_pop(struct keycode *ev)
+{
+	if (keycode_buffer.len < 1)
+		return 1;
+
+	*ev = keycode_buffer.data[keycode_buffer.start];
+	keycode_buffer.len--;
+	keycode_buffer.start++;
+	keycode_buffer.start %= N_KEYCODE;
+	return 0;
+}
+
+size_t keycode_len(void)
+{
+	return keycode_buffer.len;
+}
+
+void mouse_event_push(struct mouse_event *ev)
+{
+	// save mouse_event
+	mouse_event_buffer.data[mouse_event_buffer.end] = *ev;
+
+	// update pointers
+	mouse_event_buffer.end++;
+	mouse_event_buffer.end %= N_KEYCODE;
+	if (mouse_event_buffer.len < N_KEYCODE) {
+		mouse_event_buffer.len++;
+	} else {
+		mouse_event_buffer.start++;
+		mouse_event_buffer.start %= N_KEYCODE;
+	}
+}
+
+int mouse_event_pop(struct mouse_event *ev)
+{
+	if (mouse_event_buffer.len < 1)
+		return 1;
+
+	*ev = mouse_event_buffer.data[mouse_event_buffer.start];
+	mouse_event_buffer.len--;
+	mouse_event_buffer.start++;
+	mouse_event_buffer.start %= N_KEYCODE;
+	return 0;
+}
+
+size_t mouse_event_len(void)
+{
+	return mouse_event_buffer.len;
+}