[commit: packages/time] master: add DST field to Timezone (471f5ea)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/time

On branch  : master
Link       : http://git.haskell.org/packages/time.git/commitdiff/471f5ea9c67160d9740c63e6aab87a9b72c72747

>---------------------------------------------------------------

commit 471f5ea9c67160d9740c63e6aab87a9b72c72747
Author: Ashley Yakeley <ashley at semantic.org>
Date:   Sun May 1 02:05:11 2005 -0700

    add DST field to Timezone
    
    darcs-hash:20050501090511-ac6dd-7dfe69ea72cee8b3fe4bd070dd0a1065fdd30280


>---------------------------------------------------------------

471f5ea9c67160d9740c63e6aab87a9b72c72747
 System/Time/Calendar/TimeOfDay.hs |  4 ++--
 System/Time/Calendar/Timezone.hs  | 24 ++++++++++++++----------
 TestFormat.hs                     |  6 +++---
 timestuff.c                       |  5 ++++-
 timestuff.h                       |  2 +-
 5 files changed, 24 insertions(+), 17 deletions(-)

diff --git a/System/Time/Calendar/TimeOfDay.hs b/System/Time/Calendar/TimeOfDay.hs
index d71c334..17cdc93 100644
--- a/System/Time/Calendar/TimeOfDay.hs
+++ b/System/Time/Calendar/TimeOfDay.hs
@@ -46,12 +46,12 @@ instance FormatTime TimeOfDay where
 -- | convert a ToD in UTC to a ToD in some timezone, together with a day adjustment
 utcToLocalTimeOfDay :: Timezone -> TimeOfDay -> (Integer,TimeOfDay)
 utcToLocalTimeOfDay zone (TimeOfDay h m s) = (fromIntegral (div h' 24),TimeOfDay (mod h' 24) (mod m' 60) s) where
-	m' = m + timezoneToMinutes zone
+	m' = m + timezoneMinutes zone
 	h' = h + (div m' 60)
 
 -- | convert a ToD in some timezone to a ToD in UTC, together with a day adjustment
 localToUTCTimeOfDay :: Timezone -> TimeOfDay -> (Integer,TimeOfDay)
-localToUTCTimeOfDay zone = utcToLocalTimeOfDay (minutesToTimezone (negate (timezoneToMinutes zone)))
+localToUTCTimeOfDay zone = utcToLocalTimeOfDay (minutesToTimezone (negate (timezoneMinutes zone)))
 
 posixDay :: DiffTime
 posixDay = fromInteger 86400
diff --git a/System/Time/Calendar/Timezone.hs b/System/Time/Calendar/Timezone.hs
index acfcad0..87defcd 100644
--- a/System/Time/Calendar/Timezone.hs
+++ b/System/Time/Calendar/Timezone.hs
@@ -3,7 +3,7 @@
 module System.Time.Calendar.Timezone
 (
 	-- time zones
-	Timezone,timezoneToMinutes,minutesToTimezone,hoursToTimezone,utc,
+	Timezone(..),minutesToTimezone,hoursToTimezone,utc,
 
 	-- getting the locale time zone
 	getTimezone,getCurrentTimezone
@@ -17,12 +17,13 @@ import Foreign
 import Foreign.C
 
 -- | count of minutes
-newtype Timezone = MkTimezone {
-	timezoneToMinutes :: Int
+data Timezone = MkTimezone {
+	timezoneDST :: Bool,
+	timezoneMinutes :: Int
 } deriving (Eq,Ord)
 
 minutesToTimezone :: Int -> Timezone
-minutesToTimezone = MkTimezone
+minutesToTimezone = MkTimezone False
 
 hoursToTimezone :: Int -> Timezone
 hoursToTimezone i = minutesToTimezone (60 * i)
@@ -31,8 +32,8 @@ showT :: Int -> String
 showT t = (show2 (div t 60)) ++ (show2 (mod t 60))
 
 instance Show Timezone where
-	show (MkTimezone t) | t < 0 = '-':(showT (negate t))
-	show (MkTimezone t) = '+':(showT t)
+	show (MkTimezone _ t) | t < 0 = '-':(showT (negate t))
+	show (MkTimezone _ t) = '+':(showT t)
 
 instance FormatTime Timezone where
 	formatCharacter _ 'z' zone = Just (show zone)
@@ -42,18 +43,21 @@ instance FormatTime Timezone where
 utc :: Timezone
 utc = minutesToTimezone 0
 
-foreign import ccall unsafe "timestuff.h get_current_timezone_seconds" get_current_timezone_seconds :: CTime -> IO CLong
+foreign import ccall unsafe "timestuff.h get_current_timezone_seconds" get_current_timezone_seconds :: CTime -> Ptr CInt -> IO CLong
 
 posixToCTime :: POSIXTime -> CTime
 posixToCTime  = fromInteger . floor
 
 -- | Get the local time-zone for a given time (varying as per summertime adjustments)
 getTimezone :: UTCTime -> IO Timezone
-getTimezone time = do
-	secs <- get_current_timezone_seconds (posixToCTime (utcTimeToPOSIXSeconds time))
+getTimezone time = with 0 (\pdst -> do
+	secs <- get_current_timezone_seconds (posixToCTime (utcTimeToPOSIXSeconds time)) pdst
 	case secs of
 		0x80000000 -> fail "localtime_r failed"
-		_ -> return (minutesToTimezone (div (fromIntegral secs) 60))
+		_ -> do
+			dst <- peek pdst
+			return (MkTimezone (dst == 1) (div (fromIntegral secs) 60))
+	)
 
 -- | Get the current time-zone
 getCurrentTimezone :: IO Timezone
diff --git a/TestFormat.hs b/TestFormat.hs
index 6675884..4d7f800 100644
--- a/TestFormat.hs
+++ b/TestFormat.hs
@@ -26,11 +26,11 @@ withBuffer n f = withArray (replicate n 0) (\buffer -> do
 
 unixFormatTime :: String -> Timezone -> UTCTime -> IO String
 unixFormatTime fmt zone time = withCString fmt (\pfmt ->
-		withBuffer 100 (\buffer -> format_time buffer 100 pfmt 0 (fromIntegral (timezoneToMinutes zone * 60)) (fromInteger (truncate (utcTimeToPOSIXSeconds time))))
+		withBuffer 100 (\buffer -> format_time buffer 100 pfmt (if timezoneDST zone then 1 else 0) (fromIntegral (timezoneMinutes zone * 60)) (fromInteger (truncate (utcTimeToPOSIXSeconds time))))
 		)
 
 locale :: TimeLocale
-locale = defaultTimeLocale
+locale = defaultTimeLocale {dateTimeFmt = "%a %b %e %H:%M:%S %Y"}
 
 zones :: [Timezone]
 zones = [utc,hoursToTimezone (- 7)]
@@ -46,7 +46,7 @@ times = [baseTime1,addUTCTime posixDay baseTime1,addUTCTime (2 * posixDay) baseT
 
 -- as found in http://www.opengroup.org/onlinepubs/007908799/xsh/strftime.html
 chars :: [Char]
-chars = "aAbBcCdDehHIjmMnprRStTuUVwWxXyYZ%"
+chars = "aAbBcCdDehHIjmMnprRStTuUVwWxXyYzZ%"
 
 main :: IO ()
 main = mapM_ (\char -> let fmt = '%':char:[] in mapM_ (\time -> mapM_ (\zone -> let
diff --git a/timestuff.c b/timestuff.c
index 92d9fbe..6968a9d 100644
--- a/timestuff.c
+++ b/timestuff.c
@@ -1,10 +1,13 @@
 #include "timestuff.h"
 
-long int get_current_timezone_seconds (time_t t)
+long int get_current_timezone_seconds (time_t t,int* dst)
 {
 	struct tm tmd;
 	struct tm* ptm = localtime_r(&t,&tmd);
 	if (ptm)
+	{
+		*dst = ptm -> tm_isdst;
 		return ptm -> tm_gmtoff;
+	}
 	else return 0x80000000;
 }
diff --git a/timestuff.h b/timestuff.h
index 534ee67..6eaf614 100644
--- a/timestuff.h
+++ b/timestuff.h
@@ -1,3 +1,3 @@
 #include <time.h>
 
-long int get_current_timezone_seconds (time_t);
+long int get_current_timezone_seconds (time_t,int* dst);