#include "HsTime.h"
#include <stdio.h>

long int get_current_timezone_seconds (time_t t,int* pdst,char const* * pname)
{
#if HAVE_LOCALTIME_R
	struct tm tmd;
	struct tm* ptm = localtime_r(&t,&tmd);
#else
	struct tm* ptm = localtime(&t);
#endif
	if (ptm)
	{
		int dst = ptm -> tm_isdst;
		*pdst = dst;
#if HAVE_TM_ZONE
		*pname = ptm -> tm_zone;
		return ptm -> tm_gmtoff;
#elif defined(_MSC_VER) || defined(__MINGW32__) || defined(_WIN32)
		// We don't have a better API to use on Windows, the logic to
		// decide whether a given date/time falls within DST is
		// implemented as part of localtime() in the CRT.  This is_dst
		// flag is all we need here.
		*pname = dst ? _tzname[1] : _tzname[0];
		return - (dst ? _timezone - 3600 : _timezone);
#else
# if HAVE_TZNAME
		*pname = *tzname;
# else
#  error "Don't know how to get timezone name on your OS"
# endif
# if HAVE_DECL_ALTZONE
		return dst ? altzone : timezone;
# else
		return dst ? timezone - 3600 : timezone;
# endif
#endif // HAVE_TM_ZONE
	}
	else return 0x80000000;
}