1 files changed, 39 insertions, 0 deletions
diff --git a/src/iobuffer.c b/src/iobuffer.c
new file mode 100644
index 0000000..8bfcc07
--- /dev/null
+++ b/src/iobuffer.c
@@ -0,0 +1,39 @@
+#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;
+}
+
+////////////////////////////////////////////////////////