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;
+}
+
+////////////////////////////////////////////////////////