/*

 * We also need to set the value high enough to signal inclusion of

 * newer features (like clock_gettime).  See the POSIX spec for more info:

 * http://pubs.opengroup.org/onlinepubs/9699919799/functions/V2_chap02.html#tag_15_02_01_02

 *

 * This file is Copyright 2010 by the GPSD project

 * SPDX-License-Identifier: BSD-2-clause

 */

#include "../include/gpsd_config.h"  /* must be before all includes */

#include <ctype.h>

#include <errno.h>

#include <math.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/time.h>

#include <time.h>

#include "../include/timespec.h"

/* Convert a normalized timespec to a nice string

 * put in it *buf, buf should be at least 22 bytes

 *

 * the returned buffer will look like, shortest case:

 *    sign character ' ' or '-'

 *    one digit of seconds

 *    decmal point '.'

 *    9 digits of nanoSec

 *

 * So 12 chars, like this: "-0.123456789"

 *

 * Probable worst case is 10 digits of seconds,

 * but standards do not provide hard limits to time_t

 * So 21 characters like this: "-2147483647.123456789"

 *

 * date --date='@2147483647' is: Mon Jan 18 19:14:07 PST 2038

 * date --date='@9999999999' is: Sat Nov 20 09:46:39 PST 2286

 *

 */

const char *timespec_str(const struct timespec *ts, char *buf, size_t buf_size)

{

    char sign = ' ';

    if (!TS_GEZ(ts)) {

        sign = '-';

    }

    /* %lld and (long long) because some time_t is bigger than a long

     * mostly on 32-bit systems. */

    (void)snprintf(buf, buf_size, "%c%lld.%09ld",

                   sign,

                   (long long)llabs(ts->tv_sec),

                   (long)labs(ts->tv_nsec));

    return  buf;

}

/* end */

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