AOO410/main/sal/osl/os2/time.c

/**************************************************************
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 *************************************************************/




#include "system.h"

#include <osl/diagnose.h>
#include <osl/time.h>

/* FIXME: detection should be done in configure script */
#if defined(MACOSX) || defined(FREEBSD) || defined(NETBSD) || defined(LINUX)
#define STRUCT_TM_HAS_GMTOFF 1

#elif defined(SOLARIS)
#define HAS_ALTZONE 1
#endif

/*--------------------------------------------------
 * osl_getSystemTime
 *-------------------------------------------------*/

sal_Bool SAL_CALL osl_getSystemTime(TimeValue* TimeValue)
{
	struct timeval tp;

    /* FIXME: use higher resolution */
	gettimeofday(&tp, NULL);

	TimeValue->Seconds = tp.tv_sec;
	TimeValue->Nanosec = tp.tv_usec * 1000;

	return (sal_True);
}


/*--------------------------------------------------
 * osl_getDateTimeFromTimeValue
 *-------------------------------------------------*/

sal_Bool SAL_CALL osl_getDateTimeFromTimeValue( TimeValue* pTimeVal, oslDateTime* pDateTime )
{
	struct tm *pSystemTime;
    struct tm tmBuf;
	time_t atime;

	atime = (time_t)pTimeVal->Seconds;
	
	/* Convert time from type time_t to struct tm */
	pSystemTime = gmtime_r( &atime, &tmBuf );


	/* Convert struct tm to struct oslDateTime */
	if ( pSystemTime != NULL )
	{
		pDateTime->NanoSeconds	=	pTimeVal->Nanosec;
		pDateTime->Seconds		=	pSystemTime->tm_sec;
		pDateTime->Minutes		=	pSystemTime->tm_min;
		pDateTime->Hours		=	pSystemTime->tm_hour;
		pDateTime->Day			=	pSystemTime->tm_mday;
		pDateTime->DayOfWeek	=	pSystemTime->tm_wday;
		pDateTime->Month		=	pSystemTime->tm_mon + 1;
		pDateTime->Year			=	pSystemTime->tm_year  + 1900;

		return sal_True;
	}

	return sal_False;
}

/*--------------------------------------------------
 * osl_getTimeValueFromDateTime
 *--------------------------------------------------*/

sal_Bool SAL_CALL osl_getTimeValueFromDateTime( oslDateTime* pDateTime, TimeValue* pTimeVal )
{
	struct tm	aTime;
	time_t		nSeconds;

	/* Convert struct oslDateTime to struct tm */
	aTime.tm_sec  = pDateTime->Seconds;
	aTime.tm_min  = pDateTime->Minutes;
	aTime.tm_hour = pDateTime->Hours;
	aTime.tm_mday = pDateTime->Day;
	aTime.tm_wday = pDateTime->DayOfWeek;

	if ( pDateTime->Month > 0 )
		aTime.tm_mon = pDateTime->Month - 1;
	else 
		return sal_False;

	if ( pDateTime->Year >= 1900 )
		aTime.tm_year = pDateTime->Year - 1900;
	else 
		return sal_False;

    aTime.tm_isdst = -1;
	aTime.tm_wday  = 0;
	aTime.tm_yday  = 0;

	/* Convert time to calendar value */
	nSeconds = mktime( &aTime );

    /*
     * mktime expects the struct tm to be in local timezone, so we have to adjust 
     * the returned value to be timezone neutral.
     */
     
	if ( nSeconds != (time_t) -1 )
	{
        time_t bias;
        
		/* timezone corrections */
		tzset();

#if defined(STRUCT_TM_HAS_GMTOFF)
        /* members of struct tm are corrected by mktime */
        bias = 0 - aTime.tm_gmtoff;

#elif defined(HAS_ALTZONE)
        /* check if daylight saving time is in effect */
        bias = aTime.tm_isdst > 0 ? altzone : timezone;
#else
        /* exspect daylight saving time to be one hour */
        bias = aTime.tm_isdst > 0 ? timezone - 3600 : timezone;
#endif
        
        pTimeVal->Seconds = nSeconds;
		pTimeVal->Nanosec = pDateTime->NanoSeconds;

        if ( nSeconds > bias )
		    pTimeVal->Seconds -= bias;
           
		return sal_True;
	}

	return sal_False;
}


/*--------------------------------------------------
 * osl_getLocalTimeFromSystemTime
 *--------------------------------------------------*/

sal_Bool SAL_CALL osl_getLocalTimeFromSystemTime( TimeValue* pSystemTimeVal, TimeValue* pLocalTimeVal )
{ 
    struct tm *pLocalTime;
    struct tm tmBuf;
    time_t bias;
	time_t atime;

    atime = (time_t) pSystemTimeVal->Seconds;
    pLocalTime = localtime_r( &atime, &tmBuf );

#if defined(STRUCT_TM_HAS_GMTOFF)
    /* members of struct tm are corrected by mktime */
    bias = 0 - pLocalTime->tm_gmtoff;
       
#elif defined(HAS_ALTZONE)
    /* check if daylight saving time is in effect */
    bias = pLocalTime->tm_isdst > 0 ? altzone : timezone;
#else
    /* exspect daylight saving time to be one hour */
    bias = pLocalTime->tm_isdst > 0 ? timezone - 3600 : timezone;
#endif

	if ( (sal_Int64) pSystemTimeVal->Seconds > bias )
	{
		pLocalTimeVal->Seconds = pSystemTimeVal->Seconds - bias;
		pLocalTimeVal->Nanosec = pSystemTimeVal->Nanosec;

		return sal_True;
	}

	return sal_False;
}

/*--------------------------------------------------
 * osl_getSystemTimeFromLocalTime
 *--------------------------------------------------*/

sal_Bool SAL_CALL osl_getSystemTimeFromLocalTime( TimeValue* pLocalTimeVal, TimeValue* pSystemTimeVal )
{
	struct tm *pLocalTime;
    struct tm tmBuf;
	time_t bias;
	time_t atime;

    atime = (time_t) pLocalTimeVal->Seconds;

    /* Convert atime, which is a local time, to it's GMT equivalent. Then, get
     * the timezone offset for the local time for the GMT equivalent time. Note
     * that we cannot directly use local time to determine the timezone offset
     * because GMT is the only reliable time that we can determine timezone
     * offset from.
     */

    atime = mktime( gmtime_r( &atime, &tmBuf ) );
    pLocalTime = localtime_r( &atime, &tmBuf );

#if defined(STRUCT_TM_HAS_GMTOFF)
    /* members of struct tm are corrected by mktime */
    bias = 0 - pLocalTime->tm_gmtoff;
       
#elif defined(HAS_ALTZONE)
    /* check if daylight saving time is in effect */
    bias = pLocalTime->tm_isdst > 0 ? altzone : timezone;
#else
    /* exspect daylight saving time to be one hour */
    bias = pLocalTime->tm_isdst > 0 ? timezone - 3600 : timezone;
#endif

	if ( (sal_Int64) pLocalTimeVal->Seconds + bias > 0 )
	{
		pSystemTimeVal->Seconds = pLocalTimeVal->Seconds + bias;
		pSystemTimeVal->Nanosec = pLocalTimeVal->Nanosec;

		return sal_True;
	}

	return sal_False; 
}



static struct timeval startTime;
static sal_Bool bGlobalTimer = sal_False;

sal_uInt32 SAL_CALL osl_getGlobalTimer()
{
  struct timeval currentTime;
  sal_uInt32 nSeconds;

  // FIXME: not thread safe !!
  if ( bGlobalTimer == sal_False )
  {
      gettimeofday( &startTime, NULL );
      bGlobalTimer=sal_True;
  }
  
  gettimeofday( &currentTime, NULL );
  
  nSeconds = (sal_uInt32)( currentTime.tv_sec - startTime.tv_sec );

  return ( nSeconds * 1000 ) + (long) (( currentTime.tv_usec - startTime.tv_usec) / 1000 );
}