Remove dependency on libevdev (mostly complete) + minor fixes

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

1 files changed, 55 insertions, 0 deletions

diff --git a/libgamepad_drain__.c b/libgamepad_drain__.c
new file mode 100644
index 0000000..38e898e
--- /dev/null
+++ b/libgamepad_drain__.c
@@ -0,0 +1,55 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+#define DEFER_EINTR(ERROR_CONDITION)\
+	DEFER_EINTR_(device, ERROR_CONDITION, fail)
+
+
+int
+libgamepad_drain__(struct libgamepad_device *device)
+{
+	struct input_event buf[4 * 8];
+	int flags, saved_errno = errno;
+	ssize_t r;
+
+	if (device->internals->deferred_error) {
+		errno = device->internals->deferred_error;
+		device->internals->deferred_error = 0;
+		return -1;
+	}
+
+	flags = fcntl(device->fd, F_GETFL);
+	if (flags < 0)
+		return -1;
+
+	if (!(flags & O_NONBLOCK))
+		if (fcntl(device->fd, F_GETFL, flags | O_NONBLOCK) < 0)
+			goto fail;
+
+	for (;;) {
+		r = read(device->fd, buf, sizeof(buf));
+		if (r < (ssize_t)sizeof(buf)) {
+			if (r > 0)
+				break;
+			else if (!r)
+				goto nodev;
+			else if (errno == EAGAIN)
+				break;
+			else if (errno == EINTR)
+				device->internals->deferred_error = EINTR;
+			else
+				goto fail;
+		}
+	}
+
+	if (!(flags & O_NONBLOCK))
+		DEFER_EINTR(fcntl(device->fd, F_SETFL, flags) < 0);
+
+	errno = saved_errno;
+	return 0;
+
+nodev:
+	errno = ENODEV;
+fail:
+	return -1;
+}