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/*****************************************************************************
*
* 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;
}
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