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/*
* Time Functions
* (C) 1999-2010 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/time.h>
#include <botan/exceptn.h>
#include <ctime>
#if defined(BOTAN_TARGET_OS_HAS_WIN32_GET_SYSTEMTIME)
#include <windows.h>
#endif
#if defined(BOTAN_TARGET_OS_HAS_GETTIMEOFDAY)
#include <sys/time.h>
#endif
#if defined(BOTAN_TARGET_OS_HAS_CLOCK_GETTIME)
#ifndef _POSIX_C_SOURCE
#define _POSIX_C_SOURCE 199309
#endif
#include <time.h>
#ifndef CLOCK_REALTIME
#define CLOCK_REALTIME 0
#endif
#endif
namespace Botan {
namespace {
/**
* Combine a two time values into a single one
*/
u64bit combine_timers(u32bit seconds, u32bit parts, u32bit parts_hz)
{
static const u64bit NANOSECONDS_UNITS = 1000000000;
u64bit res = seconds * NANOSECONDS_UNITS;
res += parts * (NANOSECONDS_UNITS / parts_hz);
return res;
}
std::tm do_gmtime(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 == 0)
throw Encoding_Error("time_t_to_tm could not convert");
tm = *tm_p;
#endif
return tm;
}
}
/**
* Get the system clock
*/
u64bit system_time()
{
return static_cast<u64bit>(std::time(0));
}
/*
* Convert a time_point to a calendar_point
*/
calendar_point calendar_value(u64bit a_time_t)
{
std::tm tm = do_gmtime(static_cast<std::time_t>(a_time_t));
return calendar_point(tm.tm_year + 1900,
tm.tm_mon + 1,
tm.tm_mday,
tm.tm_hour,
tm.tm_min,
tm.tm_sec);
}
u64bit get_nanoseconds_clock()
{
#if defined(BOTAN_TARGET_OS_HAS_CLOCK_GETTIME)
struct ::timespec tv;
::clock_gettime(CLOCK_REALTIME, &tv);
return combine_timers(tv.tv_sec, tv.tv_nsec, 1000000000);
#elif defined(BOTAN_TARGET_OS_HAS_GETTIMEOFDAY)
struct ::timeval tv;
::gettimeofday(&tv, 0);
return combine_timers(tv.tv_sec, tv.tv_usec, 1000000);
#elif defined(BOTAN_TARGET_OS_HAS_WIN32_GET_SYSTEMTIME)
// Returns time since January 1, 1601 in 100-ns increments
::FILETIME tv;
::GetSystemTimeAsFileTime(&tv);
u64bit tstamp = (static_cast<u64bit>(tv.dwHighDateTime) << 32) |
tv.dwLowDateTime;
return (tstamp * 100); // Scale to 1 nanosecond units
#else
return combine_timers(static_cast<u32bit>(std::time(0)),
std::clock(), CLOCKS_PER_SEC);
#endif
}
}
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