diff options
author | Henrik Rydberg <rydberg@euromail.se> | 2010-06-17 18:12:58 +0200 |
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committer | Henrik Rydberg <rydberg@euromail.se> | 2010-06-17 18:12:58 +0200 |
commit | 66e5de9eaefc33ffa6af3617f9ec7a50f10af50d (patch) | |
tree | 66535311e0b9c422b30341237fd596fb9ebbdd75 /src/evbuf.h | |
download | mtdev-git-66e5de9eaefc33ffa6af3617f9ec7a50f10af50d.tar.gz |
Initial load of mtdev project
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Diffstat (limited to 'src/evbuf.h')
-rw-r--r-- | src/evbuf.h | 64 |
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 |