Archipelago » qemu

    int first_size, start;

    /* room in the buffer? */

    if (size > (RECV_BUF - s->recv_used))

        size = RECV_BUF - s->recv_used;

    start = s->recv_ptr + s->recv_used;

    if (start < RECV_BUF) {

        /* copy data to end of buffer */

        first_size = RECV_BUF - start;

        if (first_size > size)

            first_size = size;

        memcpy(s->recv_buf + start, buf, first_size);

        /* wrap around to front if needed */

        if (size > first_size)

            memcpy(s->recv_buf, buf + first_size, size - first_size);

    } else {

        start -= RECV_BUF;

        memcpy(s->recv_buf + start, buf, size);

    }