time_helper.h

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// Copyright (c) 2006-2013, Andrey N. Sabelnikov, www.sabelnikov.net
// All rights reserved.
// 
// 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 Andrey N. Sabelnikov 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
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// 



#pragma once

#include <chrono>
#include <cstdio>
#include <ctime>
#include <string>

namespace epee
{
namespace misc_utils
{
    inline bool get_gmt_time(time_t t, struct tm &tm)
    {
#ifdef _WIN32
        return gmtime_s(&tm, &t);
#else
        return gmtime_r(&t, &tm);
#endif
    }

    inline std::string get_internet_time_str(const time_t& time_)
    {
        char tmpbuf[200] = {0};
        struct tm pt;
        get_gmt_time(time_, pt);
        strftime(tmpbuf, 199, "%a, %d %b %Y %H:%M:%S GMT", &pt);
        return tmpbuf;
    }

    inline std::string get_time_interval_string(const time_t& time_)
    {
        time_t tail = time_;
        const int days = static_cast<int>(tail/(60*60*24));
        tail = tail%(60*60*24);
        const int hours = static_cast<int>(tail/(60*60));
        tail = tail%(60*60);
        const int minutes = static_cast<int>(tail/60);
        tail = tail%(60);
        const int seconds = static_cast<int>(tail);

        char tmpbuf[64] = {0};
        snprintf(tmpbuf, sizeof(tmpbuf) - 1, "d%d.h%d.m%d.s%d", days, hours, minutes, seconds);

        return tmpbuf;
    }

    inline uint64_t get_ns_count()
    {
        typedef std::chrono::duration<uint64_t, std::nano> ns_duration;
        const ns_duration ns_since_epoch = std::chrono::steady_clock::now().time_since_epoch();
        return ns_since_epoch.count();
    }

    inline uint64_t get_tick_count()
    {
        return get_ns_count() / 1000000;
    }
}
}