/*
 * Copyright 2014-2017, Intel Corporation
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *
 *     * 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.
 *
 *     * Neither the name of the copyright holder nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "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 THE COPYRIGHT
 * OWNER 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.
 */

/*
 * manpage.c -- simple example for the libpmemlog man page
 */

#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <stdlib.h>
#ifndef _WIN32
#include <unistd.h>
#endif
#include <string.h>
#include <libpmemlog.h>

/* size of the pmemlog pool -- 1 GB */
#define POOL_SIZE ((size_t)(1 << 30))

/*
 * printit -- log processing callback for use with pmemlog_walk()
 */
static int
printit(const void *buf, size_t len, void *arg)
{
	fwrite(buf, len, 1, stdout);
	return 0;
}

int
main(int argc, char *argv[])
{
	const char path[] = "/pmem-fs/myfile";
	PMEMlogpool *plp;
	size_t nbyte;
	char *str;

	/* create the pmemlog pool or open it if it already exists */
	plp = pmemlog_create(path, POOL_SIZE, 0666);

	if (plp == NULL)
	    plp = pmemlog_open(path);

	if (plp == NULL) {
		perror(path);
		exit(1);
	}

	/* how many bytes does the log hold? */
	nbyte = pmemlog_nbyte(plp);
	printf("log holds %zu bytes\n", nbyte);

	/* append to the log... */
	str = "This is the first string appended\n";
	if (pmemlog_append(plp, str, strlen(str)) < 0) {
		perror("pmemlog_append");
		exit(1);
	}
	str = "This is the second string appended\n";
	if (pmemlog_append(plp, str, strlen(str)) < 0) {
		perror("pmemlog_append");
		exit(1);
	}

	/* print the log contents */
	printf("log contains:\n");
	pmemlog_walk(plp, 0, printit, NULL);

	pmemlog_close(plp);
}