1 files changed, 64 insertions, 0 deletions

diff --git a/src/evbuf.h b/src/evbuf.h
new file mode 100644
index 0000000..ba61cd5
--- /dev/null
+++ b/src/evbuf.h
@@ -0,0 +1,64 @@
+/*****************************************************************************
+ *
+ * mtdev - MT device event converter (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.
+ *
+ ****************************************************************************/
+
+#ifndef MTDEV_EVBUF_H
+#define MTDEV_EVBUF_H
+
+#include "common.h"
+
+struct mtdev_evbuf {
+        int head;
+        int tail;
+        struct input_event buffer[DIM_EVENTS];
+};
+
+static inline int evbuf_empty(const struct mtdev_evbuf *evbuf)
+{
+        return evbuf->head == evbuf->tail;
+}
+
+static inline int evbuf_full(const struct mtdev_evbuf *evbuf)
+{
+        return ((evbuf->head + 1) & (DIM_EVENTS - 1)) == evbuf->tail;
+}
+
+static inline void evbuf_put(struct mtdev_evbuf *evbuf,
+                             const struct input_event *ev)
+{
+        evbuf->buffer[evbuf->head++] = *ev;
+        evbuf->head &= DIM_EVENTS - 1;
+}
+
+static inline void evbuf_get(struct mtdev_evbuf *evbuf,
+                             struct input_event *ev)
+{
+        *ev = evbuf->buffer[evbuf->tail++];
+        evbuf->tail &= DIM_EVENTS - 1;
+}
+
+#endif