First commit

Signed-off-by: Mattias Andrée <maandree@kth.se>

1 files changed, 57 insertions, 0 deletions

diff --git a/libgamepad_next_event.c b/libgamepad_next_event.c
new file mode 100644
index 0000000..acc23ea
--- /dev/null
+++ b/libgamepad_next_event.c
@@ -0,0 +1,57 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+int
+libgamepad_next_event(struct libgamepad_device *device, struct libgamepad_input_event *eventp)
+{
+	int r;
+	struct input_event ev;
+
+	if (!device->require_sync) {
+		r = libevdev_next_event(device->dev, LIBEVDEV_READ_FLAG_NORMAL, &ev);
+		if (r < 0) {
+			errno = -r;
+			return -1;
+		}
+	} else {
+		r = libevdev_next_event(device->dev, LIBEVDEV_READ_FLAG_SYNC, &ev);
+		if (r == -EAGAIN) {
+			device->require_sync = 0; /* yes, this is how it is document */
+			return 0;
+		} else if (r < 0) {
+			errno = -r;
+			return -1;
+		}
+		if (r != LIBEVDEV_READ_STATUS_SYNC) /* just to be safe */
+			device->require_sync = 0;
+	}
+
+	eventp->sync_event = (r == LIBEVDEV_READ_STATUS_SYNC);
+	eventp->code = ev.code;
+	eventp->value = ev.value;
+	eventp->time.tv_sec = ev.input_event_sec;
+	eventp->time.tv_usec = ev.input_event_usec;
+
+	switch (ev.type) {
+	case EV_KEY:
+		eventp->type = LIBGAMEPAD_BUTTON;
+		return 1;
+
+	case EV_ABS:
+		eventp->type = LIBGAMEPAD_ABSOLUTE_AXIS;
+		return 1;
+
+	case EV_REL:
+		eventp->type = LIBGAMEPAD_RELATIVE_AXIS;
+		return 1;
+
+	case EV_SYN:
+		if (ev.code == SYN_DROPPED)
+			device->require_sync = 1;
+		return 0;
+
+	default:
+		return 0;
+	}
+}