1 files changed, 87 insertions, 0 deletions
diff --git a/src/iobuf.c b/src/iobuf.c
new file mode 100644
index 0000000..61ec9c1
--- /dev/null
+++ b/src/iobuf.c
@@ -0,0 +1,87 @@
+/*****************************************************************************
+ *
+ * mtdev - Multitouch Protocol Translation Library (MIT license)
+ *
+ * Copyright (C) 2010 Henrik Rydberg <rydberg@euromail.se>
+ * Copyright (C) 2010 Canonical Ltd.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ ****************************************************************************/
+
+#include "iobuf.h"
+#include "state.h"
+#include <unistd.h>
+#include <poll.h>
+
+int mtdev_idle(struct mtdev *dev, int fd, int ms)
+{
+	struct mtdev_iobuf *buf = &dev->state->iobuf;
+        struct pollfd fds = { fd, POLLIN, 0 };
+	return	buf->head == buf->tail && poll(&fds, 1, ms) <= 0;
+}
+
+int mtdev_fetch_event(struct mtdev *dev, int fd, struct input_event *ev)
+{
+	struct mtdev_iobuf *buf = &dev->state->iobuf;
+	int n = buf->head - buf->tail;
+	if (n < EVENT_SIZE) {
+		if (buf->tail && n > 0)
+			memmove(buf->data, buf->data + buf->tail, n);
+		buf->head = n;
+		buf->tail = 0;
+		SYSCALL(n = read(fd, buf->data + buf->head,
+				 DIM_BUFFER - buf->head));
+		if (n <= 0)
+			return n;
+		buf->head += n;
+	}
+	if (buf->head - buf->tail < EVENT_SIZE)
+		return 0;
+	memcpy(ev, buf->data + buf->tail, EVENT_SIZE);
+	buf->tail += EVENT_SIZE;
+	return 1;
+}
+
+int mtdev_empty(struct mtdev *dev)
+{
+	return evbuf_empty(&dev->state->outbuf);
+}
+
+void mtdev_get_event(struct mtdev *dev, struct input_event* ev)
+{
+	evbuf_get(&dev->state->outbuf, ev);
+}
+
+int mtdev_get(struct mtdev *dev, int fd, struct input_event* ev, int ev_max)
+{
+	struct input_event kev;
+	int ret, count = 0;
+	while (count < ev_max) {
+		while (mtdev_empty(dev)) {
+			ret = mtdev_fetch_event(dev, fd, &kev);
+			if (ret <= 0)
+				return count > 0 ? count : ret;
+			mtdev_put_event(dev, &kev);
+		}
+		mtdev_get_event(dev, &ev[count++]);
+	}
+	return count;
+}