// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * iov.c - helpers for using (partial) iovecs.
 *
 * Copyrigh (c) 2024 Red Hat
 * Author: Laurent Vivier <lvivier@redhat.com>
 *
 * This file also contains code originally from QEMU include/qemu/iov.h
 * and licensed under the following terms:
 *
 * Copyright (C) 2010 Red Hat, Inc.
 *
 * Author(s):
 *  Amit Shah <amit.shah@redhat.com>
 *  Michael Tokarev <mjt@tls.msk.ru>
 *
 * This work is licensed under the terms of the GNU GPL, version 2.  See
 * the COPYING file in the top-level directory.
 *
 * Contributions after 2012-01-13 are licensed under the terms of the
 * GNU GPL, version 2 or (at your option) any later version.
 */

#ifndef IOVEC_H
#define IOVEC_H

#include <unistd.h>
#include <string.h>

size_t iov_fill_from_buf(const struct iovec *iov, unsigned int iov_cnt,
			 size_t offset, const void *buf, size_t bytes);
size_t iov_fill_to_buf(const struct iovec *iov, const unsigned int iov_cnt,
		       size_t offset, void *buf, size_t bytes);
size_t iov_from_buf(const struct iovec *iov, unsigned int iov_cnt,
                    size_t offset, const void *buf, size_t bytes);
size_t iov_to_buf(const struct iovec *iov, unsigned int iov_cnt,
                  size_t offset, void *buf, size_t bytes);

size_t iov_size(const struct iovec *iov, const unsigned int iov_cnt);
unsigned iov_copy(struct iovec *dst_iov, unsigned int dst_iov_cnt,
		  const struct iovec *iov, unsigned int iov_cnt,
		  size_t offset, size_t bytes);
#endif /* IOVEC_H */