#ifndef TARANTOOL_LIB_CORE_COIO_BUF_H_INCLUDED
#define TARANTOOL_LIB_CORE_COIO_BUF_H_INCLUDED
/*
 * Copyright 2010-2016, Tarantool AUTHORS, please see AUTHORS file.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 * 1. Redistributions of source code must retain the above
 *    copyright notice, this list of conditions and the
 *    following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above
 *    copyright notice, this list of conditions and the following
 *    disclaimer in the documentation and/or other materials
 *    provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY <COPYRIGHT HOLDER> ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
 * <COPYRIGHT HOLDER> OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
#include "coio.h"
#include "diag.h"
#include <small/ibuf.h>

struct iostream;

/** Buffered cooperative IO */

/**
 * Read at least sz bytes, buffered.
 * Return the number of bytes read (can be less than n in case
 * of EOF).
 */
static inline ssize_t
coio_bread(struct iostream *io, struct ibuf *buf, size_t sz)
{
	xibuf_reserve(buf, sz);
	ssize_t n = coio_read_ahead(io, buf->wpos, sz, ibuf_unused(buf));
	if (n < 0)
		diag_raise();
	VERIFY(ibuf_alloc(buf, n) != NULL);
	return n;
}

/**
 * Read at least sz bytes buffered or until a timeout reached.
 * Return the amount of bytes read (can be less than sz
 * in case of EOF or timeout).
 */
static inline ssize_t
coio_bread_timeout(struct iostream *io, struct ibuf *buf, size_t sz,
		   ev_tstamp timeout)
{
	xibuf_reserve(buf, sz);
	ssize_t n = coio_read_ahead_timeout(io, buf->wpos, sz, ibuf_unused(buf),
			                    timeout);
	if (n < 0)
		diag_raise();
	VERIFY(ibuf_alloc(buf, n) != NULL);
	return n;
}

/** Read at least sz bytes, buffered. Throw an exception in case of EOF. */
static inline ssize_t
coio_breadn(struct iostream *io, struct ibuf *buf, size_t sz)
{
	xibuf_reserve(buf, sz);
	ssize_t n = coio_readn_ahead(io, buf->wpos, sz, ibuf_unused(buf));
	if (n < 0)
		diag_raise();
	VERIFY(ibuf_alloc(buf, n) != NULL);
	return n;
}

/**
 * Read at least sz bytes, buffered. Throw an exception in case
 * of EOF.
 * @return the number of bytes read. Can be less than sz in
 * case of timeout.
 */
static inline ssize_t
coio_breadn_timeout(struct iostream *io, struct ibuf *buf, size_t sz,
		    ev_tstamp timeout)
{
	xibuf_reserve(buf, sz);
	ssize_t n = coio_readn_ahead_timeout(io, buf->wpos, sz, ibuf_unused(buf),
			                     timeout);
	if (n < 0)
		diag_raise();
	VERIFY(ibuf_alloc(buf, n) != NULL);
	return n;
}

#endif /* TARANTOOL_LIB_CORE_COIO_BUF_H_INCLUDED */
