/cbits/HsTime.c

http://github.com/takano-akio/time · C · 40 lines · 35 code · 1 blank · 4 comment · 6 complexity · 5db3c72b5a6e65f00429d1ba5b095644 MD5 · raw file 

    

  1. #include "HsTime.h"
    2. 

  2. #include <stdio.h>
    3. 

  3. 

  4. long int get_current_timezone_seconds (time_t t,int* pdst,char const* * pname)
    5. 

  5. {
    6. 

  6. #if HAVE_LOCALTIME_R
    7. 

  7. 	struct tm tmd;
    8. 

  8. 	struct tm* ptm = localtime_r(&t,&tmd);
    9. 

  9. #else
    10. 

  10. 	struct tm* ptm = localtime(&t);
    11. 

  11. #endif
    12. 

  12. 	if (ptm)
    13. 

  13. 	{
    14. 

  14. 		int dst = ptm -> tm_isdst;
    15. 

  15. 		*pdst = dst;
    16. 

  16. #if HAVE_TM_ZONE
    17. 

  17. 		*pname = ptm -> tm_zone;
    18. 

  18. 		return ptm -> tm_gmtoff;
    19. 

  19. #elif defined(_MSC_VER) || defined(__MINGW32__) || defined(_WIN32)
    20. 

  20. 		// We don't have a better API to use on Windows, the logic to
    21. 

  21. 		// decide whether a given date/time falls within DST is
    22. 

  22. 		// implemented as part of localtime() in the CRT.  This is_dst
    23. 

  23. 		// flag is all we need here.
    24. 

  24. 		*pname = dst ? _tzname[1] : _tzname[0];
    25. 

  25. 		return - (dst ? _timezone - 3600 : _timezone);
    26. 

  26. #else
    27. 

  27. # if HAVE_TZNAME
    28. 

  28. 		*pname = *tzname;
    29. 

  29. # else
    30. 

  30. #  error "Don't know how to get timezone name on your OS"
    31. 

  31. # endif
    32. 

  32. # if HAVE_DECL_ALTZONE
    33. 

  33. 		return dst ? altzone : timezone;
    34. 

  34. # else
    35. 

  35. 		return dst ? timezone - 3600 : timezone;
    36. 

  36. # endif
    37. 

  37. #endif // HAVE_TM_ZONE
    38. 

  38. 	}
    39. 

  39. 	else return 0x80000000;
    40. 

  40. }
    41.