+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Circular buffer implementation.
* Copyright (C) 2017 Cumulus Networks
* Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <zebra.h>
memset(buf->data, 0x00, buf->size);
ringbuf_reset(buf);
}
-
-ssize_t ringbuf_read(struct ringbuf *buf, int sock)
-{
- size_t to_read = ringbuf_space(buf);
- size_t bytes_to_end = buf->size - buf->end;
- ssize_t bytes_read;
- struct iovec iov[2] = {};
-
- /* Calculate amount of read blocks. */
- if (to_read > bytes_to_end) {
- iov[0].iov_base = buf->data + buf->end;
- iov[0].iov_len = bytes_to_end;
- iov[1].iov_base = buf->data;
- iov[1].iov_len = to_read - bytes_to_end;
- } else {
- iov[0].iov_base = buf->data + buf->end;
- iov[0].iov_len = to_read;
- }
-
- /* Do the system call. */
- bytes_read = readv(sock, iov, 2);
- if (bytes_read <= 0)
- return bytes_read;
-
- /* Calculate the new end. */
- if ((size_t)bytes_read > bytes_to_end)
- buf->end = bytes_read - bytes_to_end;
- else
- buf->end += bytes_read;
-
- /* Set emptiness state. */
- buf->empty = (buf->start == buf->end) && (buf->empty && !bytes_read);
-
- return bytes_read;
-}