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