// SPDX-License-Identifier: CDDL-1.0
/*
 * This file and its contents are supplied under the terms of the
 * Common Development and Distribution License ("CDDL"), version 1.0.
 * You may only use this file in accordance with the terms of version
 * 1.0 of the CDDL.
 *
 * A full copy of the text of the CDDL should have accompanied this
 * source.  A copy of the CDDL is also available via the Internet at
 * https://opensource.org/license/CDDL-1.0.
 */
/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <stdio.h>
#include <time.h>
#include <langinfo.h>
#include "statcommon.h"

#ifndef _DATE_FMT
#ifdef D_T_FMT
#define	_DATE_FMT D_T_FMT
#else /* D_T_FMT */
#define	_DATE_FMT "%+"
#endif /* !D_T_FMT */
#endif /* _DATE_FMT */

/*
 * Print timestamp as decimal reprentation of time_t value (-T u was specified)
 * or in date(1) format (-T d was specified).
 */
void
print_timestamp(uint_t timestamp_fmt)
{
	time_t t = time(NULL);
	static const char *fmt = NULL;

	/* We only need to retrieve this once per invocation */
	if (fmt == NULL)
		fmt = nl_langinfo(_DATE_FMT);

	if (timestamp_fmt == UDATE) {
		(void) printf("%lld\n", (longlong_t)t);
	} else if (timestamp_fmt == DDATE) {
		char dstr[64];
		struct tm tm;
		int len;

		len = strftime(dstr, sizeof (dstr), fmt, localtime_r(&t, &tm));
		if (len > 0)
			(void) printf("%s\n", dstr);
	}
}

/*
 * Return timestamp as decimal reprentation (in string) of time_t
 * value (-T u was specified) or in date(1) format (-T d was specified).
 */
void
get_timestamp(uint_t timestamp_fmt, char *buf, int len)
{
	time_t t = time(NULL);
	static const char *fmt = NULL;

	/* We only need to retrieve this once per invocation */
	if (fmt == NULL)
		fmt = nl_langinfo(_DATE_FMT);

	if (timestamp_fmt == UDATE) {
		(void) snprintf(buf, len, "%lld", (longlong_t)t);
	} else if (timestamp_fmt == DDATE) {
		struct tm tm;
		strftime(buf, len, fmt, localtime_r(&t, &tm));
	}
}

/*
 * Format the provided time stamp to human readable format
 */
void
format_timestamp(time_t t, char *buf, int len)
{
	struct tm tm;
	static const char *fmt = NULL;

	if (t == 0) {
		snprintf(buf, len, "-");
		return;
	}

	/* We only need to retrieve this once per invocation */
	if (fmt == NULL)
		fmt = nl_langinfo(_DATE_FMT);
	strftime(buf, len, fmt, localtime_r(&t, &tm));
}