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/*
* Calendar Functions
* (C) 1999-2010 Jack Lloyd
* (C) 2015 Simon Warta (Kullo GmbH)
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/calendar.h>
#include <botan/exceptn.h>
#include <ctime>
#include <sstream>
#include <iomanip>
#include <mutex>
#if defined(BOTAN_HAS_BOOST_DATETIME)
#include <boost/date_time/posix_time/posix_time_types.hpp>
#endif
namespace Botan {
namespace {
std::tm do_gmtime(std::time_t time_val)
{
std::tm tm;
#if defined(BOTAN_TARGET_OS_HAS_GMTIME_S)
gmtime_s(&tm, &time_val); // Windows
#elif defined(BOTAN_TARGET_OS_HAS_GMTIME_R)
gmtime_r(&time_val, &tm); // Unix/SUSv2
#else
std::tm* tm_p = std::gmtime(&time_val);
if (tm_p == nullptr)
throw Encoding_Error("time_t_to_tm could not convert");
tm = *tm_p;
#endif
return tm;
}
#if !defined(BOTAN_TARGET_OS_HAS_TIMEGM) && !defined(BOTAN_TARGET_OS_HAS_MKGMTIME)
#if defined(BOTAN_HAS_BOOST_DATETIME)
std::time_t boost_timegm(std::tm *tm)
{
const int sec = tm->tm_sec;
const int min = tm->tm_min;
const int hour = tm->tm_hour;
const int day = tm->tm_mday;
const int mon = tm->tm_mon + 1;
const int year = tm->tm_year + 1900;
std::time_t out;
{
using namespace boost::posix_time;
using namespace boost::gregorian;
const auto epoch = ptime(date(1970, 01, 01));
const auto time = ptime(date(year, mon, day),
hours(hour) + minutes(min) + seconds(sec));
const time_duration diff(time - epoch);
out = diff.ticks() / diff.ticks_per_second();
}
return out;
}
#else
#pragma message "Caution! A fallback version of timegm() is used which is not thread-safe"
std::mutex ENV_TZ;
std::time_t fallback_timegm(std::tm *tm)
{
std::time_t out;
std::string tz_backup;
ENV_TZ.lock();
// Store current value of env variable TZ
const char* tz_env_pointer = ::getenv("TZ");
if (tz_env_pointer != nullptr)
tz_backup = std::string(tz_env_pointer);
// Clear value of TZ
::setenv("TZ", "", 1);
::tzset();
out = ::mktime(tm);
// Restore TZ
if (!tz_backup.empty())
{
// setenv makes a copy of the second argument
::setenv("TZ", tz_backup.data(), 1);
}
else
{
::unsetenv("TZ");
}
::tzset();
ENV_TZ.unlock();
return out;
}
#endif // BOTAN_HAS_BOOST_DATETIME
#endif
}
std::chrono::system_clock::time_point calendar_point::to_std_timepoint() const
{
if (year < 1970)
throw Invalid_Argument("calendar_point::to_std_timepoint() does not support years before 1970.");
// 32 bit time_t ends at January 19, 2038
// https://msdn.microsoft.com/en-us/library/2093ets1.aspx
// For consistency reasons, throw after 2037 as long as
// no other implementation is available.
if (year > 2037)
throw Invalid_Argument("calendar_point::to_std_timepoint() does not support years after 2037.");
// std::tm: struct without any timezone information
std::tm tm;
tm.tm_isdst = -1; // i.e. no DST information available
tm.tm_sec = seconds;
tm.tm_min = minutes;
tm.tm_hour = hour;
tm.tm_mday = day;
tm.tm_mon = month - 1;
tm.tm_year = year - 1900;
// Define a function alias `botan_timegm`
#if defined(BOTAN_TARGET_OS_HAS_TIMEGM)
std::time_t (&botan_timegm)(std::tm *tm) = timegm;
#elif defined(BOTAN_TARGET_OS_HAS_MKGMTIME)
// http://stackoverflow.com/questions/16647819/timegm-cross-platform
std::time_t (&botan_timegm)(std::tm *tm) = _mkgmtime;
#elif defined(BOTAN_HAS_BOOST_DATETIME)
std::time_t (&botan_timegm)(std::tm *tm) = boost_timegm;
#else
std::time_t (&botan_timegm)(std::tm *tm) = fallback_timegm;
#endif
// Convert std::tm to std::time_t
std::time_t tt = botan_timegm(&tm);
if (tt == -1)
throw Invalid_Argument("calendar_point couldn't be converted: " + to_string());
return std::chrono::system_clock::from_time_t(tt);
}
std::string calendar_point::to_string() const
{
// desired format: <YYYY>-<MM>-<dd>T<HH>:<mm>:<ss>
std::stringstream output;
{
using namespace std;
output << setfill('0')
<< setw(4) << year << "-" << setw(2) << month << "-" << setw(2) << day
<< "T"
<< setw(2) << hour << ":" << setw(2) << minutes << ":" << setw(2) << seconds;
}
return output.str();
}
calendar_point calendar_value(
const std::chrono::system_clock::time_point& time_point)
{
std::tm tm = do_gmtime(std::chrono::system_clock::to_time_t(time_point));
return calendar_point(tm.tm_year + 1900,
tm.tm_mon + 1,
tm.tm_mday,
tm.tm_hour,
tm.tm_min,
tm.tm_sec);
}
}
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