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#include "iobuffer.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;
}
////////////////////////////////////////////////////////
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