datetime.cpp

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/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          https://www.mrpt.org/                         |
   |                                                                        |
   | Copyright (c) 2005-2019, Individual contributors, see AUTHORS file     |
   | See: https://www.mrpt.org/Authors - All rights reserved.               |
   | Released under BSD License. See: https://www.mrpt.org/License          |
   +------------------------------------------------------------------------+ */

#include "system-precomp.h"  // Precompiled headers

#include <mrpt/core/exceptions.h>
#include <mrpt/system/datetime.h>
#include <mrpt/system/os.h>

#ifdef _WIN32
#include <windows.h>

#include <conio.h>
#include <direct.h>
#include <io.h>
#include <process.h>
#include <sys/utime.h>
#include <tlhelp32.h>
#else
#include <pthread.h>
#include <sys/select.h>
#include <sys/time.h>
#include <termios.h>
#include <unistd.h>
#include <utime.h>
#include <cerrno>
#endif

#include <sys/stat.h>
#include <sys/types.h>
#include <cmath>  // floor()
#include <ctime>
#include <iostream>  // for the << operator

using namespace mrpt;
using namespace mrpt::system;
using namespace std;

mrpt::system::TTimeStamp mrpt::system::time_tToTimestamp(const time_t& t)
{
    return time_tToTimestamp(static_cast<double>(t));
}

void mrpt::system::timestampToParts(TTimeStamp t, TTimeParts& p, bool localTime)
{
    const double T = mrpt::system::timestampTotime_t(t);
    double sec_frac = T - floor(T);
    ASSERT_(sec_frac < 1.0);

    const auto tt = time_t(T);

    struct tm* parts = localTime ? localtime(&tt) : gmtime(&tt);
    ASSERTMSG_(parts, "Malformed timestamp");

    p.year = parts->tm_year + 1900;
    p.month = parts->tm_mon + 1;
    p.day = parts->tm_mday;
    p.day_of_week = parts->tm_wday + 1;
    p.daylight_saving = parts->tm_isdst;
    p.hour = parts->tm_hour;
    p.minute = parts->tm_min;
    p.second = parts->tm_sec + sec_frac;
}

/*---------------------------------------------------------------
                    buildTimestampFromParts
  ---------------------------------------------------------------*/
TTimeStamp mrpt::system::buildTimestampFromParts(const TTimeParts& p)
{
    struct tm parts
    {
    };

    parts.tm_year = p.year - 1900;
    parts.tm_mon = p.month - 1;
    parts.tm_mday = p.day;
    parts.tm_wday = p.day_of_week - 1;
    parts.tm_isdst = p.daylight_saving;
    parts.tm_hour = p.hour;
    parts.tm_min = p.minute;
    parts.tm_sec = int(p.second);

    double sec_frac = p.second - parts.tm_sec;

    time_t tt = mrpt::system::os::timegm(&parts);  // Local time: mktime

    return mrpt::system::time_tToTimestamp(double(tt) + sec_frac);
}

/*---------------------------------------------------------------
                    buildTimestampFromPartsLocalTime
  ---------------------------------------------------------------*/
TTimeStamp mrpt::system::buildTimestampFromPartsLocalTime(const TTimeParts& p)
{
    struct tm parts
    {
    };

    parts.tm_year = p.year - 1900;
    parts.tm_mon = p.month - 1;
    parts.tm_mday = p.day;
    parts.tm_wday = p.day_of_week - 1;
    parts.tm_isdst = p.daylight_saving;
    parts.tm_hour = p.hour;
    parts.tm_min = p.minute;
    parts.tm_sec = int(p.second);

    double sec_frac = p.second - parts.tm_sec;

    time_t tt = mktime(&parts);

    return mrpt::system::time_tToTimestamp(double(tt) + sec_frac);
}

/*---------------------------------------------------------------
                    formatTimeInterval
  ---------------------------------------------------------------*/
string mrpt::system::formatTimeInterval(const double t)
{
    double timeSeconds = (t < 0) ? (-t) : t;
    std::string s;

    const auto nDays = static_cast<unsigned int>(timeSeconds / (3600 * 24));
    timeSeconds -= nDays * 3600 * 24;
    const auto nHours = static_cast<unsigned int>(timeSeconds / 3600);
    timeSeconds -= nHours * 3600;
    const auto nMins = static_cast<unsigned int>(timeSeconds / 60);
    const auto nSecs = static_cast<unsigned int>(timeSeconds) % 60;
    const auto milSecs =
        static_cast<unsigned int>(1000 * timeSeconds - floor(timeSeconds));

    if (nDays > 0) s += mrpt::format("%udays ", nDays);
    if (nHours > 0) s += mrpt::format("%uh ", nHours);
    if (nMins > 0) s += mrpt::format("%02umin ", nMins);
    s += mrpt::format("%02u.%03us", nSecs, milSecs);
    return s;
}

/*---------------------------------------------------------------
  Convert a timestamp into this textual form: YEAR/MONTH/DAY,HH:MM:SS.MMM
  ---------------------------------------------------------------*/
string mrpt::system::dateTimeToString(const mrpt::system::TTimeStamp t)
{
    if (t == INVALID_TIMESTAMP) return string("INVALID_TIMESTAMP");

    uint64_t tmp =
        (t.time_since_epoch().count() - ((uint64_t)116444736 * 1000000000));
    time_t auxTime = tmp / (uint64_t)10000000;
    auto secFractions = (unsigned int)(1000000 * (tmp % 10000000) / 10000000.0);
    tm* ptm = gmtime(&auxTime);

    if (!ptm) return std::string("(Malformed timestamp)");

    return format(
        "%u/%02u/%02u,%02u:%02u:%02u.%06u", 1900 + ptm->tm_year,
        ptm->tm_mon + 1, ptm->tm_mday, ptm->tm_hour, ptm->tm_min,
        (unsigned int)ptm->tm_sec, secFractions);
}

/*---------------------------------------------------------------
  Convert a timestamp into this textual form (in local time):
      YEAR/MONTH/DAY,HH:MM:SS.MMM
  ---------------------------------------------------------------*/
string mrpt::system::dateTimeLocalToString(const mrpt::system::TTimeStamp t)
{
    if (t == INVALID_TIMESTAMP) return string("INVALID_TIMESTAMP");

    uint64_t tmp =
        (t.time_since_epoch().count() - ((uint64_t)116444736 * 1000000000));
    time_t auxTime = tmp / (uint64_t)10000000;
    auto secFractions = (unsigned int)(1000000 * (tmp % 10000000) / 10000000.0);
    tm* ptm = localtime(&auxTime);

    if (!ptm) return "(Malformed timestamp)";

    return format(
        "%u/%02u/%02u,%02u:%02u:%02u.%06u", 1900 + ptm->tm_year,
        ptm->tm_mon + 1, ptm->tm_mday, ptm->tm_hour, ptm->tm_min,
        (unsigned int)ptm->tm_sec, secFractions);
}

/*---------------------------------------------------------------
                        extractDayTimeFromTimestamp
  ---------------------------------------------------------------*/
double mrpt::system::extractDayTimeFromTimestamp(
    const mrpt::system::TTimeStamp tt)
{
    MRPT_START
    ASSERT_(tt != INVALID_TIMESTAMP);

    auto t = tt.time_since_epoch().count();
#ifdef _WIN32
    SYSTEMTIME sysT;
    FileTimeToSystemTime((FILETIME*)&t, &sysT);
    return sysT.wHour * 3600.0 + sysT.wMinute * 60.0 + sysT.wSecond +
           sysT.wMilliseconds * 0.001;
#else
    time_t auxTime =
        (t - ((uint64_t)116444736 * 1000000000)) / (uint64_t)10000000;
    tm* ptm = gmtime(&auxTime);
    ASSERTMSG_(ptm, "Malformed timestamp");
    return ptm->tm_hour * 3600.0 + ptm->tm_min * 60.0 + ptm->tm_sec;
#endif
    MRPT_END
}

/*---------------------------------------------------------------
  Convert a timestamp into this textual form: HH:MM:SS.MMM
  ---------------------------------------------------------------*/
string mrpt::system::timeLocalToString(
    const mrpt::system::TTimeStamp tt, unsigned int secondFractionDigits)
{
    if (tt == INVALID_TIMESTAMP) return string("INVALID_TIMESTAMP");
    auto t = tt.time_since_epoch().count();

    uint64_t tmp = (t - ((uint64_t)116444736 * 1000000000));
    const time_t auxTime = tmp / (uint64_t)10000000;
    const tm* ptm = localtime(&auxTime);

    auto secFractions = (unsigned int)(1000000 * (tmp % 10000000) / 10000000.0);
    // We start with 10^{-6} second units: reduce if requested by user:
    const unsigned int user_secondFractionDigits = secondFractionDigits;
    while (secondFractionDigits++ < 6) secFractions = secFractions / 10;

    return format(
        "%02u:%02u:%02u.%0*u", ptm->tm_hour, ptm->tm_min,
        (unsigned int)ptm->tm_sec, user_secondFractionDigits, secFractions);
}

/*---------------------------------------------------------------
  Convert a timestamp into this textual form: HH:MM:SS.MMM
  ---------------------------------------------------------------*/
string mrpt::system::timeToString(const mrpt::system::TTimeStamp tt)
{
    if (tt == INVALID_TIMESTAMP) return string("INVALID_TIMESTAMP");
    auto t = tt.time_since_epoch().count();

    uint64_t tmp = (t - ((uint64_t)116444736 * 1000000000));
    time_t auxTime = tmp / (uint64_t)10000000;
    auto secFractions = (unsigned int)(1000000 * (tmp % 10000000) / 10000000.0);
    tm* ptm = gmtime(&auxTime);
    if (!ptm) return string("(Malformed timestamp)");

    return format(
        "%02u:%02u:%02u.%06u", ptm->tm_hour, ptm->tm_min,
        (unsigned int)ptm->tm_sec, secFractions);
}

/*---------------------------------------------------------------
  Convert a timestamp into this textual form: YEAR/MONTH/DAY
  ---------------------------------------------------------------*/
string mrpt::system::dateToString(const mrpt::system::TTimeStamp tt)
{
    if (tt == INVALID_TIMESTAMP) return string("INVALID_TIMESTAMP");
    auto t = tt.time_since_epoch().count();

    uint64_t tmp = (t - ((uint64_t)116444736 * 1000000000));
    time_t auxTime = tmp / (uint64_t)10000000;
    tm* ptm = gmtime(&auxTime);
    if (!ptm) return string("(Malformed timestamp)");

    return format(
        "%u/%02u/%02u", 1900 + ptm->tm_year, ptm->tm_mon + 1, ptm->tm_mday);
}

/** This function implements time interval formatting: Given a time in seconds,
 * it will return a string describing the interval with the most appropriate
 * unit.
 * E.g.: 1.23 year, 3.50 days, 9.3 hours, 5.3 minutes, 3.34 sec, 178.1 ms,  87.1
 * us.
 */
std::string mrpt::system::intervalFormat(const double seconds)
{
    if (seconds >= 365 * 24 * 3600)
        return format("%.2f years", seconds / (365 * 24 * 3600));
    else if (seconds >= 24 * 3600)
        return format("%.2f days", seconds / (24 * 3600));
    else if (seconds >= 3600)
        return format("%.2f hours", seconds / 3600);
    else if (seconds >= 60)
        return format("%.2f minutes", seconds / 60);
    else if (seconds >= 1)
        return format("%.2f sec", seconds);
    else if (seconds >= 1e-3)
        return format("%.2f ms", seconds * 1e3);
    else if (seconds >= 1e-6)
        return format("%.2f us", seconds * 1e6);
    else
        return format("%.2f ns", seconds * 1e9);
}

std::ostream& mrpt::system::operator<<(std::ostream& o, const TTimeStamp& t)
{
    const uint64_t v = t.time_since_epoch().count();
    o << v;
    return o;
}