xref: /trunk/main/sal/osl/unx/time.c (revision 6e2e4a188da9cb15953b6ac809239c8d1048848e)

/**************************************************************
 *
 * 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
        /* expect 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
    /* expect 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 its 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
    /* expect 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 );
}