* introduced stubbed TimeBackend to libroot, which will contain implementations

of localtime(), gmtime() and mktime()
* implemented tzset() to read the required info from libroot_timezone_info

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@37935 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/libroot/time/ICUTimeBackend.h

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2010, Oliver Tappe, [email protected].
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef _ICU_TIME_BACKEND_H
+#define _ICU_TIME_BACKEND_H
+
+
+#include <TimeBackend.h>
+
+
+namespace BPrivate {
+
+
+class ICUTimeBackend : public TimeBackend {
+public:
+								ICUTimeBackend();
+	virtual						~ICUTimeBackend();
+
+	virtual	const status_t		TZSet();
+
+	virtual void				Initialize(TimeDataBridge* dataBridge);
+
+private:
+			TimeDataBridge		fDataBridge;
+};
+
+
+}	// namespace BPrivate
+
+
+#endif	// _ICU_TIME_BACKEND_H

headers/private/libroot/time/TimeBackend.h

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2010, Oliver Tappe, [email protected].
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef _TIME_BACKEND_H
+#define _TIME_BACKEND_H
+
+
+#include <SupportDefs.h>
+
+
+namespace BPrivate {
+
+
+struct TimeDataBridge {
+	int*	addrOfDaylight;
+	long*	addrOfTimezone;
+	char**	addrOfTZName;
+
+	TimeDataBridge();
+};
+
+
+class TimeBackend {
+public:
+								TimeBackend();
+	virtual						~TimeBackend();
+
+	virtual	const status_t		TZSet() = 0;
+
+	virtual void				Initialize(TimeDataBridge* dataBridge) = 0;
+
+	static	status_t			LoadBackend();
+};
+
+
+extern TimeBackend* gTimeBackend;
+
+
+}	// namespace BPrivate
+
+
+#endif	// _TIME_BACKEND_H

src/system/libroot/add-ons/icu/time/ICUTimeBackend.cpp

@@ -0,0 +1,85 @@
+/*
+ * Copyright 2010, Oliver Tappe, [email protected].
+ * Distributed under the terms of the MIT License.
+ */
+
+
+#include "ICUTimeBackend.h"
+
+#include <new>
+
+#include <string.h>
+
+#include <unicode/timezone.h>
+
+#include <ErrnoMaintainer.h>
+
+
+namespace BPrivate {
+
+
+extern "C" TimeBackend*
+CreateInstance()
+{
+	return new(std::nothrow) ICUTimeBackend();
+}
+
+
+ICUTimeBackend::ICUTimeBackend()
+{
+}
+
+
+ICUTimeBackend::~ICUTimeBackend()
+{
+}
+
+
+void
+ICUTimeBackend::Initialize(TimeDataBridge* dataBridge)
+{
+	fDataBridge = dataBridge;
+}
+
+
+void
+ICUTimeBackend::TZSet(void)
+{
+	ErrnoMaintainer errnoMaintainer;
+
+	TimeZone* icuTimeZone;
+	if (zoneCode == NULL || zoneCode[0] == '\0')
+		icuTimeZone = TimeZone::createDefault();
+	else
+		icuTimeZone = TimeZone::createTimeZone(zoneCode);
+
+	UnicodeString unicodeString;
+	icuTimeZone->getID(unicodeString);
+	BStringByteSink converter(&fCode);
+	unicodeString.toUTF8(converter);
+
+	unicodeString.remove();
+	icuTimeZone->getDisplayName(unicodeString);
+	converter.SetTo(&fName);
+	unicodeString.toUTF8(converter);
+
+	int32_t rawOffset;
+	int32_t dstOffset;
+	UDate nowMillis = 1000 * (double)time(NULL);
+
+	UErrorCode error = U_ZERO_ERROR;
+	icuTimeZone->getOffset(nowMillis, FALSE, rawOffset, dstOffset, error);
+	if (!U_SUCCESS(error)) {
+		fOffsetFromGMT = 0;
+		fInitStatus = B_ERROR;
+	} else {
+		fOffsetFromGMT = (rawOffset + dstOffset) / 1000;
+			// we want seconds, not ms (which ICU gives us)
+		fInitStatus = B_OK;
+	}
+
+	delete icuTimeZone;
+}
+
+
+}	// namespace BPrivate

src/system/libroot/posix/time/Jamfile

@@ -13,7 +13,8 @@ MergeObject posix_time.o :
 	clock.c
 	ctime.c
 	difftime.c
-	localtime.c
+	localtime_fading_out.c
+	localtime.cpp
 	nanosleep.c
 	stime.c
 	strftime.c

src/system/libroot/posix/time/TimeBackend.cpp

@@ -0,0 +1,63 @@
+/*
+ * Copyright 2010, Oliver Tappe, [email protected].
+ * Distributed under the terms of the MIT License.
+ */
+
+
+#include "TimeBackend.h"
+
+#include <dlfcn.h>
+#include <pthread.h>
+
+
+namespace BPrivate {
+
+
+TimeBackend* gTimeBackend = NULL;
+
+
+static TimeDataBridge sTimeDataBridge;
+static pthread_once_t sBackendInitOnce = PTHREAD_ONCE_INIT;
+
+
+static void
+LoadBackend()
+{
+	void* imageHandle = dlopen("libroot-addon-icu.so", RTLD_LAZY);
+	if (imageHandle == NULL)
+		return;
+
+	typedef TimeBackend* (*symbolType)();
+	symbolType createInstanceFunc
+		= (symbolType)dlsym(imageHandle, "CreateInstance");
+	if (createInstanceFunc == NULL)
+		return;
+
+	gTimeBackend = createInstanceFunc();
+}
+
+
+TimeBackend::TimeBackend()
+{
+}
+
+
+TimeBackend::~TimeBackend()
+{
+}
+
+
+status_t
+TimeBackend::LoadBackend()
+{
+	if (gTimeBackend == NULL) {
+		pthread_once(&sBackendInitOnce, &BPrivate::LoadBackend);
+		if (gTimeBackend != NULL)
+			gTimeBackend->Initialize(&sTimeDataBridge);
+	}
+
+	return gTimeBackend != NULL ? B_OK : B_ERROR;
+}
+
+
+}	// namespace BPrivate

src/system/libroot/posix/time/TimeDataBridge.cpp

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2010, Oliver Tappe, [email protected].
+ * Distributed under the terms of the MIT License.
+ */
+
+
+#include "TimeBackend.h"
+
+
+namespace BPrivate {
+
+
+TimeDataBridge::TimeDataBridge()
+	:
+	addrOfDaylight(&daylight),
+	addrOfTimezone(&timezone),
+	addrOfTZName(tzname)
+{
+}
+
+
+}	// namespace BPrivate

src/system/libroot/posix/time/localtime.cpp

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2010, Oliver Tappe, [email protected].
+ * Distributed under the terms of the MIT License.
+ */
+
+
+#include <stdio.h>
+#include <string.h>
+
+#include <localtime.h>
+
+#include <FindDirectory.h>
+#include <StorageDefs.h>
+
+
+char* tzname[2] = { "???", "???" };
+long timezone = 0;
+int daylight = 0;
+
+
+namespace BPrivate {
+
+
+static time_zone_info tzInfo;
+
+
+extern "C" void
+tzset(void)
+{
+	char path[B_PATH_NAME_LENGTH];
+	if (find_directory(B_COMMON_SETTINGS_DIRECTORY, -1, false, path,
+			sizeof(path)) < 0)
+		return;
+	strlcat(path, "/", sizeof(path));
+	strlcat(path, skPosixTimeZoneInfoFile, sizeof(path));
+
+	FILE* tzInfoFile = fopen(path, "r");
+	if (tzInfoFile == NULL)
+		return;
+
+	size_t numRead = fread(&tzInfo, sizeof(tzInfo), 1, tzInfoFile);
+	fclose(tzInfoFile);
+
+	if (numRead != 1)
+		return;
+
+	tzname[0] = tzInfo.short_std_name;
+	tzname[1] = tzInfo.short_dst_name;
+	timezone = tzInfo.offset_from_gmt;
+	daylight = tzInfo.uses_daylight_saving;
+}
+
+
+}	// namespace BPrivate

src/system/libroot/posix/time/localtime_fading_out.c

@@ -202,10 +202,12 @@ static char		lcl_TZname[TZ_STRLEN_MAX + 1];
 static int		lcl_is_set;
 static int		gmt_is_set;
 
+#if 0
 char *			tzname[2] = {
 	wildabbr,
 	wildabbr
 };
+#endif
 
 /*
 ** Section 4.12.3 of X3.159-1989 requires that
@@ -217,10 +219,12 @@ char *			tzname[2] = {
 
 static struct tm	tm;
 
+#if 0
 #ifdef USG_COMPAT
 time_t			timezone = 0;
 int			daylight = 0;
 #endif /* defined USG_COMPAT */
+#endif
 
 #ifdef ALTZONE
 time_t			altzone = 0;
@@ -1164,6 +1168,7 @@ tzsetwall P((void))
 #include <StorageDefs.h>
 #include <syscalls.h>
 
+#if 0
 void
 tzset P((void))
 {
@@ -1212,6 +1217,7 @@ tzset P((void))
 			(void) gmtload(lclptr);
 	settzname();
 }
+#endif
 
 /*
 ** The easy way to behave "as if no library function calls" localtime