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/***************************************************************************
*
* Multitouch X driver
* Copyright (C) 2008 Henrik Rydberg <rydberg@euromail.se>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
**************************************************************************/
#include <mtdev-iobuf.h>
#include <sys/poll.h>
void init_iobuf(struct IOBuffer *buf)
{
memset(buf, 0, sizeof(struct IOBuffer));
buf->at = buf->begin;
buf->top = buf->at;
buf->end = buf->begin + DIM_BUFFER;
}
const struct input_event *get_iobuf_event(struct IOBuffer *buf, int fd)
{
const struct input_event *ev;
int n = buf->top - buf->at;
if (n < EVENT_SIZE) {
/* partial event is available: save it */
if (buf->at != buf->begin && n > 0)
memmove(buf->begin, buf->at, n);
/* start from the beginning */
buf->at = buf->begin;
buf->top = buf->at + n;
/* read more data */
SYSCALL(n = read(fd, buf->top, buf->end - buf->top));
if (n <= 0)
return NULL;
buf->top += n;
}
if (buf->top - buf->at < EVENT_SIZE)
return NULL;
ev = (const struct input_event *)buf->at;
buf->at += EVENT_SIZE;
return ev;
}
int poll_iobuf(struct IOBuffer *buf, int fd, int ms)
{
struct pollfd fds = { fd, POLLIN, 0 };
if (buf->top != buf->at)
return 1;
return poll(&fds, 1, ms);
}
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