/*

 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")

 *

 * SPDX-License-Identifier: MPL-2.0

 *

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, you can obtain one at https://mozilla.org/MPL/2.0/.

 *

 * See the COPYRIGHT file distributed with this work for additional

 * information regarding copyright ownership.

 */

/*! \file */

#include <errno.h>

#include <stdbool.h>

#include <stddef.h> /* NULL */

#include <stdlib.h> /* NULL */

#include <syslog.h>

#include <time.h>

#include <isc/stdtime.h>

#include <isc/strerr.h>

#include <isc/util.h>

#define NS_PER_S 1000000000 /*%< Nanoseconds per second. */

#if defined(CLOCK_REALTIME_COARSE)

#define CLOCKSOURCE CLOCK_REALTIME_COARSE

#elif defined(CLOCK_REALTIME_FAST)

#define CLOCKSOURCE CLOCK_REALTIME_FAST

#else /* if defined(CLOCK_REALTIME_COARSE) */

#define CLOCKSOURCE CLOCK_REALTIME

#endif /* if defined(CLOCK_REALTIME_COARSE) */

void

isc_stdtime_get(isc_stdtime_t *t) {

  REQUIRE(t != NULL);

  struct timespec ts;

  if (clock_gettime(CLOCKSOURCE, &ts) == -1) {

    char strbuf[ISC_STRERRORSIZE];

    strerror_r(errno, strbuf, sizeof(strbuf));

    isc_error_fatal(__FILE__, __LINE__, "clock_gettime failed: %s",

        strbuf);

  }

  REQUIRE(ts.tv_sec > 0 && ts.tv_nsec >= 0 && ts.tv_nsec < NS_PER_S);

  *t = (isc_stdtime_t)ts.tv_sec;

}

void

isc_stdtime_tostring(isc_stdtime_t t, char *out, size_t outlen) {

  time_t when;

  REQUIRE(out != NULL);

  REQUIRE(outlen >= 26);

  UNUSED(outlen);

  /* time_t and isc_stdtime_t might be different sizes */

  when = t;

  INSIST((ctime_r(&when, out) != NULL));

  *(out + strlen(out) - 1) = '\0';

}