| 1 | /* $Id $ */
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| 2 | /** @file
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| 3 | * IPRT - Local Time, Posix.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2007 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*******************************************************************************
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| 29 | * Header Files *
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| 30 | *******************************************************************************/
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| 31 | #define LOG_GROUP RTLOGGROUP_TIME
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| 32 | #define RTTIME_INCL_TIMEVAL
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| 33 | #include <iprt/types.h>
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| 34 | #include <sys/time.h>
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| 35 | #include <time.h>
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| 36 |
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| 37 | #include <iprt/time.h>
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| 38 |
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| 39 |
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| 40 | /**
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| 41 | * This tries to find the UTC offset for a given timespec.
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| 42 | *
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| 43 | * It does probably not take into account changes in daylight
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| 44 | * saving over the years or similar stuff.
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| 45 | *
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| 46 | * @returns UTC offset in nanoseconds.
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| 47 | * @param pTime The time.
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| 48 | * @param fCurrentTime Whether the input is current time or not.
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| 49 | * This is for avoid infinit recursion on errors in the fallback path.
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| 50 | */
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| 51 | static int64_t rtTimeLocalUTCOffset(PCRTTIMESPEC pTime, bool fCurrentTime)
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| 52 | {
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| 53 | RTTIMESPEC Fallback;
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| 54 |
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| 55 | /*
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| 56 | * Convert to time_t.
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| 57 | */
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| 58 | int64_t i64UnixTime = RTTimeSpecGetSeconds(pTime);
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| 59 | time_t UnixTime = i64UnixTime;
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| 60 | if (UnixTime != i64UnixTime)
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| 61 | return fCurrentTime ? 0 : rtTimeLocalUTCOffset(RTTimeNow(&Fallback), true);
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| 62 |
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| 63 | /*
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| 64 | * Explode it as both local and uct time.
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| 65 | */
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| 66 | struct tm TmLocal;
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| 67 | if ( !localtime_r(&UnixTime, &TmLocal)
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| 68 | || !TmLocal.tm_year)
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| 69 | return fCurrentTime ? 0 : rtTimeLocalUTCOffset(RTTimeNow(&Fallback), true);
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| 70 | struct tm TmUct;
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| 71 | if (!gmtime_r(&UnixTime, &TmUct))
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| 72 | return fCurrentTime ? 0 : rtTimeLocalUTCOffset(RTTimeNow(&Fallback), true);
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| 73 |
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| 74 | /*
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| 75 | * Calc the difference (if any).
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| 76 | * We ASSUME that the difference is less that 24 hours.
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| 77 | */
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| 78 | if ( TmLocal.tm_hour == TmUct.tm_hour
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| 79 | && TmLocal.tm_min == TmUct.tm_min
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| 80 | && TmLocal.tm_sec == TmUct.tm_sec
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| 81 | && TmLocal.tm_mday == TmUct.tm_mday)
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| 82 | return 0;
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| 83 |
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| 84 | int LocalSecs = TmLocal.tm_hour * 3600
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| 85 | + TmLocal.tm_min * 60
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| 86 | + TmLocal.tm_sec;
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| 87 | int UctSecs = TmUct.tm_hour * 3600
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| 88 | + TmUct.tm_min * 60
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| 89 | + TmUct.tm_sec;
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| 90 | if (TmLocal.tm_mday != TmUct.tm_mday)
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| 91 | {
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| 92 | if ( ( TmLocal.tm_mday > TmUct.tm_mday
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| 93 | && TmUct.tm_mday != 1)
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| 94 | || TmLocal.tm_mday == 1)
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| 95 | LocalSecs += 24*60*60;
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| 96 | else
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| 97 | UctSecs += 24*60*60;
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| 98 | }
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| 99 |
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| 100 | return (LocalSecs - UctSecs) * INT64_C(1000000000);
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| 101 | }
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| 102 |
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| 103 |
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| 104 | /**
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| 105 | * Gets the delta between UTC and local time.
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| 106 | *
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| 107 | * @code
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| 108 | * RTTIMESPEC LocalTime;
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| 109 | * RTTimeSpecAddNano(RTTimeNow(&LocalTime), RTTimeLocalDeltaNano());
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| 110 | * @endcode
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| 111 | *
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| 112 | * @returns Returns the nanosecond delta between UTC and local time.
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| 113 | */
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| 114 | RTDECL(int64_t) RTTimeLocalDeltaNano(void)
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| 115 | {
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| 116 | RTTIMESPEC Time;
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| 117 | return rtTimeLocalUTCOffset(RTTimeNow(&Time), true /* current time, skip fallback */);
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| 118 | }
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| 119 |
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| 120 |
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| 121 | /**
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| 122 | * Explodes a time spec to the localized timezone.
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| 123 | *
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| 124 | * @returns pTime.
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| 125 | * @param pTime Where to store the exploded time.
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| 126 | * @param pTimeSpec The time spec to exploded. (UTC)
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| 127 | */
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| 128 | RTDECL(PRTTIME) RTTimeLocalExplode(PRTTIME pTime, PCRTTIMESPEC pTimeSpec)
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| 129 | {
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| 130 | RTTIMESPEC LocalTime = *pTimeSpec;
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| 131 | RTTimeSpecAddNano(&LocalTime, rtTimeLocalUTCOffset(&LocalTime, true /* current time, skip fallback */));
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| 132 | pTime = RTTimeExplode(pTime, &LocalTime);
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| 133 | if (pTime)
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| 134 | pTime->fFlags = (pTime->fFlags & ~RTTIME_FLAGS_TYPE_MASK) | RTTIME_FLAGS_TYPE_LOCAL;
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| 135 | return pTime;
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| 136 | }
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| 137 |
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