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/*
* Copyright 2007-2019 Content Management AG
* All rights reserved.
*
* author: Max Kellermann <mk@cm4all.com>
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "Convert.hxx"
#include <stdexcept>
#include <time.h>
#include <sys/time.h> /* for struct timeval */
struct tm
GmTime(std::chrono::system_clock::time_point tp)
{
const time_t t = std::chrono::system_clock::to_time_t(tp);
#ifdef _WIN32
const struct tm *tm = gmtime(&t);
#else
struct tm buffer, *tm = gmtime_r(&t, &buffer);
#endif
if (tm == nullptr)
throw std::runtime_error("gmtime_r() failed");
return *tm;
}
struct tm
LocalTime(std::chrono::system_clock::time_point tp)
{
const time_t t = std::chrono::system_clock::to_time_t(tp);
#ifdef _WIN32
const struct tm *tm = localtime(&t);
#else
struct tm buffer, *tm = localtime_r(&t, &buffer);
#endif
if (tm == nullptr)
throw std::runtime_error("localtime_r() failed");
return *tm;
}
#ifndef __GLIBC__
/**
* Determine the time zone offset in a portable way.
*/
gcc_const
static time_t
GetTimeZoneOffset() noexcept
{
time_t t = 1234567890;
#ifdef _WIN32
struct tm *p = gmtime(&t);
#else
struct tm tm;
tm.tm_isdst = 0;
struct tm *p = &tm;
gmtime_r(&t, p);
#endif
return t - mktime(p);
}
#endif /* !__GLIBC__ */
std::chrono::system_clock::time_point
TimeGm(struct tm &tm) noexcept
{
#ifdef __GLIBC__
/* timegm() is a GNU extension */
const auto t = timegm(&tm);
#else
tm.tm_isdst = 0;
const auto t = mktime(&tm) + GetTimeZoneOffset();
#endif /* !__GLIBC__ */
return std::chrono::system_clock::from_time_t(t);
}
std::chrono::system_clock::time_point
MakeTime(struct tm &tm) noexcept
{
return std::chrono::system_clock::from_time_t(mktime(&tm));
}
std::chrono::steady_clock::duration
ToSteadyClockDuration(const struct timeval &tv) noexcept
{
return std::chrono::steady_clock::duration(std::chrono::seconds(tv.tv_sec)) +
std::chrono::steady_clock::duration(std::chrono::microseconds(tv.tv_usec));
}
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