static void qemu_fill_buffer(QEMUFile *f) { int len; int pending; assert(!qemu_file_is_writable(f)); pending = f->buf_size - f->buf_index; if (pending > 0) { memmove(f->buf, f->buf + f->buf_index, pending); } f->buf_index = 0; f->buf_size = pending; len = f->ops->get_buffer(f->opaque, f->buf + pending, f->pos, IO_BUF_SIZE - pending); if (len > 0) { f->buf_size += len; f->pos += len; } else if (len == 0) { qemu_file_set_error(f, -EIO); } else if (len != -EAGAIN) { qemu_file_set_error(f, len); } }