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+/* $Id: time.cpp $ */
+/** @file
+ * IPRT - Time.
+ */
+
+/*
+ * Copyright (C) 2006-2019 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+* Header Files *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_TIME
+#include <iprt/time.h>
+#include "internal/iprt.h"
+
+#include <iprt/assert.h>
+#include <iprt/ctype.h>
+#include <iprt/errcore.h>
+#include <iprt/string.h>
+#include "internal/time.h"
+
+
+/*********************************************************************************************************************************
+* Defined Constants And Macros *
+*********************************************************************************************************************************/
+/** The max year we possibly could implode. */
+#define RTTIME_MAX_YEAR (292 + 1970)
+/** The min year we possibly could implode. */
+#define RTTIME_MIN_YEAR (-293 + 1970)
+
+/** The max day supported by our time representation. (2262-04-11T23-47-16.854775807) */
+#define RTTIME_MAX_DAY (365*292+71 + 101-1)
+/** The min day supported by our time representation. (1677-09-21T00-12-43.145224192) */
+#define RTTIME_MIN_DAY (365*-293-70 + 264-1)
+
+/** The max nano second into the max day. (2262-04-11T23-47-16.854775807) */
+#define RTTIME_MAX_DAY_NANO ( INT64_C(1000000000) * (23*3600 + 47*60 + 16) + 854775807 )
+/** The min nano second into the min day. (1677-09-21T00-12-43.145224192) */
+#define RTTIME_MIN_DAY_NANO ( INT64_C(1000000000) * (00*3600 + 12*60 + 43) + 145224192 )
+
+/**
+ * Asserts that a_pTime is normalized.
+ */
+#define RTTIME_ASSERT_NORMALIZED(a_pTime) \
+ do \
+ { \
+ Assert(RT_ABS((a_pTime)->offUTC) <= 840); \
+ Assert((a_pTime)->u32Nanosecond < 1000000000); \
+ Assert((a_pTime)->u8Second < 60); \
+ Assert((a_pTime)->u8Minute < 60); \
+ Assert((a_pTime)->u8Hour < 24); \
+ Assert((a_pTime)->u8Month >= 1 && (a_pTime)->u8Month <= 12); \
+ Assert((a_pTime)->u8WeekDay < 7); \
+ Assert((a_pTime)->u16YearDay >= 1); \
+ Assert((a_pTime)->u16YearDay <= (rtTimeIsLeapYear((a_pTime)->i32Year) ? 366 : 365)); \
+ Assert((a_pTime)->u8MonthDay >= 1 && (a_pTime)->u8MonthDay <= 31); \
+ } while (0)
+
+
+/*********************************************************************************************************************************
+* Global Variables *
+*********************************************************************************************************************************/
+/**
+ * Days per month in a common year.
+ */
+static const uint8_t g_acDaysInMonths[12] =
+{
+ /*Jan Feb Mar Arp May Jun Jul Aug Sep Oct Nov Dec */
+ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
+};
+
+/**
+ * Days per month in a leap year.
+ */
+static const uint8_t g_acDaysInMonthsLeap[12] =
+{
+ /*Jan Feb Mar Arp May Jun Jul Aug Sep Oct Nov Dec */
+ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
+};
+
+/**
+ * The day of year for each month in a common year.
+ */
+static const uint16_t g_aiDayOfYear[12 + 1] =
+{
+ 1, /* Jan */
+ 1+31, /* Feb */
+ 1+31+28, /* Mar */
+ 1+31+28+31, /* Apr */
+ 1+31+28+31+30, /* May */
+ 1+31+28+31+30+31, /* Jun */
+ 1+31+28+31+30+31+30, /* Jul */
+ 1+31+28+31+30+31+30+31, /* Aug */
+ 1+31+28+31+30+31+30+31+31, /* Sep */
+ 1+31+28+31+30+31+30+31+31+30, /* Oct */
+ 1+31+28+31+30+31+30+31+31+30+31, /* Nov */
+ 1+31+28+31+30+31+30+31+31+30+31+30, /* Dec */
+ 1+31+28+31+30+31+30+31+31+30+31+30+31
+};
+
+/**
+ * The day of year for each month in a leap year.
+ */
+static const uint16_t g_aiDayOfYearLeap[12 + 1] =
+{
+ 1, /* Jan */
+ 1+31, /* Feb */
+ 1+31+29, /* Mar */
+ 1+31+29+31, /* Apr */
+ 1+31+29+31+30, /* May */
+ 1+31+29+31+30+31, /* Jun */
+ 1+31+29+31+30+31+30, /* Jul */
+ 1+31+29+31+30+31+30+31, /* Aug */
+ 1+31+29+31+30+31+30+31+31, /* Sep */
+ 1+31+29+31+30+31+30+31+31+30, /* Oct */
+ 1+31+29+31+30+31+30+31+31+30+31, /* Nov */
+ 1+31+29+31+30+31+30+31+31+30+31+30, /* Dec */
+ 1+31+29+31+30+31+30+31+31+30+31+30+31
+};
+
+/** The index of 1970 in g_aoffYear */
+#define OFF_YEAR_IDX_EPOCH 300
+/** The year of the first index. */
+#define OFF_YEAR_IDX_0_YEAR 1670
+
+/**
+ * The number of days the 1st of January a year is offseted from 1970-01-01.
+ */
+static const int32_t g_aoffYear[] =
+{
+/*1670:*/ 365*-300+-72, 365*-299+-72, 365*-298+-72, 365*-297+-71, 365*-296+-71, 365*-295+-71, 365*-294+-71, 365*-293+-70, 365*-292+-70, 365*-291+-70,
+/*1680:*/ 365*-290+-70, 365*-289+-69, 365*-288+-69, 365*-287+-69, 365*-286+-69, 365*-285+-68, 365*-284+-68, 365*-283+-68, 365*-282+-68, 365*-281+-67,
+/*1690:*/ 365*-280+-67, 365*-279+-67, 365*-278+-67, 365*-277+-66, 365*-276+-66, 365*-275+-66, 365*-274+-66, 365*-273+-65, 365*-272+-65, 365*-271+-65,
+/*1700:*/ 365*-270+-65, 365*-269+-65, 365*-268+-65, 365*-267+-65, 365*-266+-65, 365*-265+-64, 365*-264+-64, 365*-263+-64, 365*-262+-64, 365*-261+-63,
+/*1710:*/ 365*-260+-63, 365*-259+-63, 365*-258+-63, 365*-257+-62, 365*-256+-62, 365*-255+-62, 365*-254+-62, 365*-253+-61, 365*-252+-61, 365*-251+-61,
+/*1720:*/ 365*-250+-61, 365*-249+-60, 365*-248+-60, 365*-247+-60, 365*-246+-60, 365*-245+-59, 365*-244+-59, 365*-243+-59, 365*-242+-59, 365*-241+-58,
+/*1730:*/ 365*-240+-58, 365*-239+-58, 365*-238+-58, 365*-237+-57, 365*-236+-57, 365*-235+-57, 365*-234+-57, 365*-233+-56, 365*-232+-56, 365*-231+-56,
+/*1740:*/ 365*-230+-56, 365*-229+-55, 365*-228+-55, 365*-227+-55, 365*-226+-55, 365*-225+-54, 365*-224+-54, 365*-223+-54, 365*-222+-54, 365*-221+-53,
+/*1750:*/ 365*-220+-53, 365*-219+-53, 365*-218+-53, 365*-217+-52, 365*-216+-52, 365*-215+-52, 365*-214+-52, 365*-213+-51, 365*-212+-51, 365*-211+-51,
+/*1760:*/ 365*-210+-51, 365*-209+-50, 365*-208+-50, 365*-207+-50, 365*-206+-50, 365*-205+-49, 365*-204+-49, 365*-203+-49, 365*-202+-49, 365*-201+-48,
+/*1770:*/ 365*-200+-48, 365*-199+-48, 365*-198+-48, 365*-197+-47, 365*-196+-47, 365*-195+-47, 365*-194+-47, 365*-193+-46, 365*-192+-46, 365*-191+-46,
+/*1780:*/ 365*-190+-46, 365*-189+-45, 365*-188+-45, 365*-187+-45, 365*-186+-45, 365*-185+-44, 365*-184+-44, 365*-183+-44, 365*-182+-44, 365*-181+-43,
+/*1790:*/ 365*-180+-43, 365*-179+-43, 365*-178+-43, 365*-177+-42, 365*-176+-42, 365*-175+-42, 365*-174+-42, 365*-173+-41, 365*-172+-41, 365*-171+-41,
+/*1800:*/ 365*-170+-41, 365*-169+-41, 365*-168+-41, 365*-167+-41, 365*-166+-41, 365*-165+-40, 365*-164+-40, 365*-163+-40, 365*-162+-40, 365*-161+-39,
+/*1810:*/ 365*-160+-39, 365*-159+-39, 365*-158+-39, 365*-157+-38, 365*-156+-38, 365*-155+-38, 365*-154+-38, 365*-153+-37, 365*-152+-37, 365*-151+-37,
+/*1820:*/ 365*-150+-37, 365*-149+-36, 365*-148+-36, 365*-147+-36, 365*-146+-36, 365*-145+-35, 365*-144+-35, 365*-143+-35, 365*-142+-35, 365*-141+-34,
+/*1830:*/ 365*-140+-34, 365*-139+-34, 365*-138+-34, 365*-137+-33, 365*-136+-33, 365*-135+-33, 365*-134+-33, 365*-133+-32, 365*-132+-32, 365*-131+-32,
+/*1840:*/ 365*-130+-32, 365*-129+-31, 365*-128+-31, 365*-127+-31, 365*-126+-31, 365*-125+-30, 365*-124+-30, 365*-123+-30, 365*-122+-30, 365*-121+-29,
+/*1850:*/ 365*-120+-29, 365*-119+-29, 365*-118+-29, 365*-117+-28, 365*-116+-28, 365*-115+-28, 365*-114+-28, 365*-113+-27, 365*-112+-27, 365*-111+-27,
+/*1860:*/ 365*-110+-27, 365*-109+-26, 365*-108+-26, 365*-107+-26, 365*-106+-26, 365*-105+-25, 365*-104+-25, 365*-103+-25, 365*-102+-25, 365*-101+-24,
+/*1870:*/ 365*-100+-24, 365* -99+-24, 365* -98+-24, 365* -97+-23, 365* -96+-23, 365* -95+-23, 365* -94+-23, 365* -93+-22, 365* -92+-22, 365* -91+-22,
+/*1880:*/ 365* -90+-22, 365* -89+-21, 365* -88+-21, 365* -87+-21, 365* -86+-21, 365* -85+-20, 365* -84+-20, 365* -83+-20, 365* -82+-20, 365* -81+-19,
+/*1890:*/ 365* -80+-19, 365* -79+-19, 365* -78+-19, 365* -77+-18, 365* -76+-18, 365* -75+-18, 365* -74+-18, 365* -73+-17, 365* -72+-17, 365* -71+-17,
+/*1900:*/ 365* -70+-17, 365* -69+-17, 365* -68+-17, 365* -67+-17, 365* -66+-17, 365* -65+-16, 365* -64+-16, 365* -63+-16, 365* -62+-16, 365* -61+-15,
+/*1910:*/ 365* -60+-15, 365* -59+-15, 365* -58+-15, 365* -57+-14, 365* -56+-14, 365* -55+-14, 365* -54+-14, 365* -53+-13, 365* -52+-13, 365* -51+-13,
+/*1920:*/ 365* -50+-13, 365* -49+-12, 365* -48+-12, 365* -47+-12, 365* -46+-12, 365* -45+-11, 365* -44+-11, 365* -43+-11, 365* -42+-11, 365* -41+-10,
+/*1930:*/ 365* -40+-10, 365* -39+-10, 365* -38+-10, 365* -37+-9 , 365* -36+-9 , 365* -35+-9 , 365* -34+-9 , 365* -33+-8 , 365* -32+-8 , 365* -31+-8 ,
+/*1940:*/ 365* -30+-8 , 365* -29+-7 , 365* -28+-7 , 365* -27+-7 , 365* -26+-7 , 365* -25+-6 , 365* -24+-6 , 365* -23+-6 , 365* -22+-6 , 365* -21+-5 ,
+/*1950:*/ 365* -20+-5 , 365* -19+-5 , 365* -18+-5 , 365* -17+-4 , 365* -16+-4 , 365* -15+-4 , 365* -14+-4 , 365* -13+-3 , 365* -12+-3 , 365* -11+-3 ,
+/*1960:*/ 365* -10+-3 , 365* -9+-2 , 365* -8+-2 , 365* -7+-2 , 365* -6+-2 , 365* -5+-1 , 365* -4+-1 , 365* -3+-1 , 365* -2+-1 , 365* -1+0 ,
+/*1970:*/ 365* 0+0 , 365* 1+0 , 365* 2+0 , 365* 3+1 , 365* 4+1 , 365* 5+1 , 365* 6+1 , 365* 7+2 , 365* 8+2 , 365* 9+2 ,
+/*1980:*/ 365* 10+2 , 365* 11+3 , 365* 12+3 , 365* 13+3 , 365* 14+3 , 365* 15+4 , 365* 16+4 , 365* 17+4 , 365* 18+4 , 365* 19+5 ,
+/*1990:*/ 365* 20+5 , 365* 21+5 , 365* 22+5 , 365* 23+6 , 365* 24+6 , 365* 25+6 , 365* 26+6 , 365* 27+7 , 365* 28+7 , 365* 29+7 ,
+/*2000:*/ 365* 30+7 , 365* 31+8 , 365* 32+8 , 365* 33+8 , 365* 34+8 , 365* 35+9 , 365* 36+9 , 365* 37+9 , 365* 38+9 , 365* 39+10 ,
+/*2010:*/ 365* 40+10 , 365* 41+10 , 365* 42+10 , 365* 43+11 , 365* 44+11 , 365* 45+11 , 365* 46+11 , 365* 47+12 , 365* 48+12 , 365* 49+12 ,
+/*2020:*/ 365* 50+12 , 365* 51+13 , 365* 52+13 , 365* 53+13 , 365* 54+13 , 365* 55+14 , 365* 56+14 , 365* 57+14 , 365* 58+14 , 365* 59+15 ,
+/*2030:*/ 365* 60+15 , 365* 61+15 , 365* 62+15 , 365* 63+16 , 365* 64+16 , 365* 65+16 , 365* 66+16 , 365* 67+17 , 365* 68+17 , 365* 69+17 ,
+/*2040:*/ 365* 70+17 , 365* 71+18 , 365* 72+18 , 365* 73+18 , 365* 74+18 , 365* 75+19 , 365* 76+19 , 365* 77+19 , 365* 78+19 , 365* 79+20 ,
+/*2050:*/ 365* 80+20 , 365* 81+20 , 365* 82+20 , 365* 83+21 , 365* 84+21 , 365* 85+21 , 365* 86+21 , 365* 87+22 , 365* 88+22 , 365* 89+22 ,
+/*2060:*/ 365* 90+22 , 365* 91+23 , 365* 92+23 , 365* 93+23 , 365* 94+23 , 365* 95+24 , 365* 96+24 , 365* 97+24 , 365* 98+24 , 365* 99+25 ,
+/*2070:*/ 365* 100+25 , 365* 101+25 , 365* 102+25 , 365* 103+26 , 365* 104+26 , 365* 105+26 , 365* 106+26 , 365* 107+27 , 365* 108+27 , 365* 109+27 ,
+/*2080:*/ 365* 110+27 , 365* 111+28 , 365* 112+28 , 365* 113+28 , 365* 114+28 , 365* 115+29 , 365* 116+29 , 365* 117+29 , 365* 118+29 , 365* 119+30 ,
+/*2090:*/ 365* 120+30 , 365* 121+30 , 365* 122+30 , 365* 123+31 , 365* 124+31 , 365* 125+31 , 365* 126+31 , 365* 127+32 , 365* 128+32 , 365* 129+32 ,
+/*2100:*/ 365* 130+32 , 365* 131+32 , 365* 132+32 , 365* 133+32 , 365* 134+32 , 365* 135+33 , 365* 136+33 , 365* 137+33 , 365* 138+33 , 365* 139+34 ,
+/*2110:*/ 365* 140+34 , 365* 141+34 , 365* 142+34 , 365* 143+35 , 365* 144+35 , 365* 145+35 , 365* 146+35 , 365* 147+36 , 365* 148+36 , 365* 149+36 ,
+/*2120:*/ 365* 150+36 , 365* 151+37 , 365* 152+37 , 365* 153+37 , 365* 154+37 , 365* 155+38 , 365* 156+38 , 365* 157+38 , 365* 158+38 , 365* 159+39 ,
+/*2130:*/ 365* 160+39 , 365* 161+39 , 365* 162+39 , 365* 163+40 , 365* 164+40 , 365* 165+40 , 365* 166+40 , 365* 167+41 , 365* 168+41 , 365* 169+41 ,
+/*2140:*/ 365* 170+41 , 365* 171+42 , 365* 172+42 , 365* 173+42 , 365* 174+42 , 365* 175+43 , 365* 176+43 , 365* 177+43 , 365* 178+43 , 365* 179+44 ,
+/*2150:*/ 365* 180+44 , 365* 181+44 , 365* 182+44 , 365* 183+45 , 365* 184+45 , 365* 185+45 , 365* 186+45 , 365* 187+46 , 365* 188+46 , 365* 189+46 ,
+/*2160:*/ 365* 190+46 , 365* 191+47 , 365* 192+47 , 365* 193+47 , 365* 194+47 , 365* 195+48 , 365* 196+48 , 365* 197+48 , 365* 198+48 , 365* 199+49 ,
+/*2170:*/ 365* 200+49 , 365* 201+49 , 365* 202+49 , 365* 203+50 , 365* 204+50 , 365* 205+50 , 365* 206+50 , 365* 207+51 , 365* 208+51 , 365* 209+51 ,
+/*2180:*/ 365* 210+51 , 365* 211+52 , 365* 212+52 , 365* 213+52 , 365* 214+52 , 365* 215+53 , 365* 216+53 , 365* 217+53 , 365* 218+53 , 365* 219+54 ,
+/*2190:*/ 365* 220+54 , 365* 221+54 , 365* 222+54 , 365* 223+55 , 365* 224+55 , 365* 225+55 , 365* 226+55 , 365* 227+56 , 365* 228+56 , 365* 229+56 ,
+/*2200:*/ 365* 230+56 , 365* 231+56 , 365* 232+56 , 365* 233+56 , 365* 234+56 , 365* 235+57 , 365* 236+57 , 365* 237+57 , 365* 238+57 , 365* 239+58 ,
+/*2210:*/ 365* 240+58 , 365* 241+58 , 365* 242+58 , 365* 243+59 , 365* 244+59 , 365* 245+59 , 365* 246+59 , 365* 247+60 , 365* 248+60 , 365* 249+60 ,
+/*2220:*/ 365* 250+60 , 365* 251+61 , 365* 252+61 , 365* 253+61 , 365* 254+61 , 365* 255+62 , 365* 256+62 , 365* 257+62 , 365* 258+62 , 365* 259+63 ,
+/*2230:*/ 365* 260+63 , 365* 261+63 , 365* 262+63 , 365* 263+64 , 365* 264+64 , 365* 265+64 , 365* 266+64 , 365* 267+65 , 365* 268+65 , 365* 269+65 ,
+/*2240:*/ 365* 270+65 , 365* 271+66 , 365* 272+66 , 365* 273+66 , 365* 274+66 , 365* 275+67 , 365* 276+67 , 365* 277+67 , 365* 278+67 , 365* 279+68 ,
+/*2250:*/ 365* 280+68 , 365* 281+68 , 365* 282+68 , 365* 283+69 , 365* 284+69 , 365* 285+69 , 365* 286+69 , 365* 287+70 , 365* 288+70 , 365* 289+70 ,
+/*2260:*/ 365* 290+70 , 365* 291+71 , 365* 292+71 , 365* 293+71 , 365* 294+71 , 365* 295+72 , 365* 296+72 , 365* 297+72 , 365* 298+72 , 365* 299+73
+};
+
+/* generator code:
+#include <stdio.h>
+bool isLeapYear(int iYear)
+{
+ return iYear % 4 == 0 && (iYear % 100 != 0 || iYear % 400 == 0);
+}
+void printYear(int iYear, int iLeap)
+{
+ if (!(iYear % 10))
+ printf("\n/" "*%d:*" "/", iYear + 1970);
+ printf(" 365*%4d+%-3d,", iYear, iLeap);
+}
+int main()
+{
+ int iYear = 0;
+ int iLeap = 0;
+ while (iYear > -300)
+ iLeap -= isLeapYear(1970 + --iYear);
+ while (iYear < 300)
+ {
+ printYear(iYear, iLeap);
+ iLeap += isLeapYear(1970 + iYear++);
+ }
+ printf("\n");
+ return 0;
+}
+*/
+
+/** RFC-1123 week day names. */
+static const char * const g_apszWeekDays[7] =
+{
+ "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"
+};
+/** RFC-1123 month of the year names. */
+static const char * const g_apszMonths[1+12] =
+{
+ "000", "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
+};
+
+
+/**
+ * Checks if a year is a leap year or not.
+ *
+ * @returns true if it's a leap year.
+ * @returns false if it's a common year.
+ * @param i32Year The year in question.
+ */
+DECLINLINE(bool) rtTimeIsLeapYear(int32_t i32Year)
+{
+ return i32Year % 4 == 0
+ && ( i32Year % 100 != 0
+ || i32Year % 400 == 0);
+}
+
+
+/**
+ * Checks if a year is a leap year or not.
+ *
+ * @returns true if it's a leap year.
+ * @returns false if it's a common year.
+ * @param i32Year The year in question.
+ */
+RTDECL(bool) RTTimeIsLeapYear(int32_t i32Year)
+{
+ return rtTimeIsLeapYear(i32Year);
+}
+RT_EXPORT_SYMBOL(RTTimeIsLeapYear);
+
+
+/**
+ * Explodes a time spec (UTC).
+ *
+ * @returns pTime.
+ * @param pTime Where to store the exploded time.
+ * @param pTimeSpec The time spec to exploded.
+ */
+RTDECL(PRTTIME) RTTimeExplode(PRTTIME pTime, PCRTTIMESPEC pTimeSpec)
+{
+ int64_t i64Div;
+ int32_t i32Div;
+ int32_t i32Rem;
+ unsigned iYear;
+ const uint16_t *paiDayOfYear;
+ int iMonth;
+
+ AssertMsg(VALID_PTR(pTime), ("%p\n", pTime));
+ AssertMsg(VALID_PTR(pTimeSpec), ("%p\n", pTime));
+
+ /*
+ * The simple stuff first.
+ */
+ pTime->fFlags = RTTIME_FLAGS_TYPE_UTC;
+ i64Div = pTimeSpec->i64NanosecondsRelativeToUnixEpoch;
+ i32Rem = (int32_t)(i64Div % 1000000000);
+ i64Div /= 1000000000;
+ if (i32Rem < 0)
+ {
+ i32Rem += 1000000000;
+ i64Div--;
+ }
+ pTime->u32Nanosecond = i32Rem;
+
+ /* second */
+ i32Rem = (int32_t)(i64Div % 60);
+ i64Div /= 60;
+ if (i32Rem < 0)
+ {
+ i32Rem += 60;
+ i64Div--;
+ }
+ pTime->u8Second = i32Rem;
+
+ /* minute */
+ i32Div = (int32_t)i64Div; /* 60,000,000,000 > 33bit, so 31bit suffices. */
+ i32Rem = i32Div % 60;
+ i32Div /= 60;
+ if (i32Rem < 0)
+ {
+ i32Rem += 60;
+ i32Div--;
+ }
+ pTime->u8Minute = i32Rem;
+
+ /* hour */
+ i32Rem = i32Div % 24;
+ i32Div /= 24; /* days relative to 1970-01-01 */
+ if (i32Rem < 0)
+ {
+ i32Rem += 24;
+ i32Div--;
+ }
+ pTime->u8Hour = i32Rem;
+
+ /* weekday - 1970-01-01 was a Thursday (3) */
+ pTime->u8WeekDay = ((int)(i32Div % 7) + 3 + 7) % 7;
+
+ /*
+ * We've now got a number of days relative to 1970-01-01.
+ * To get the correct year number we have to mess with leap years. Fortunately,
+ * the representation we've got only supports a few hundred years, so we can
+ * generate a table and perform a simple two way search from the modulus 365 derived.
+ */
+ iYear = OFF_YEAR_IDX_EPOCH + i32Div / 365;
+ while (g_aoffYear[iYear + 1] <= i32Div)
+ iYear++;
+ while (g_aoffYear[iYear] > i32Div)
+ iYear--;
+ pTime->i32Year = iYear + OFF_YEAR_IDX_0_YEAR;
+ i32Div -= g_aoffYear[iYear];
+ pTime->u16YearDay = i32Div + 1;
+
+ /*
+ * Figuring out the month is done in a manner similar to the year, only here we
+ * ensure that the index is matching or too small.
+ */
+ if (rtTimeIsLeapYear(pTime->i32Year))
+ {
+ pTime->fFlags |= RTTIME_FLAGS_LEAP_YEAR;
+ paiDayOfYear = &g_aiDayOfYearLeap[0];
+ }
+ else
+ {
+ pTime->fFlags |= RTTIME_FLAGS_COMMON_YEAR;
+ paiDayOfYear = &g_aiDayOfYear[0];
+ }
+ iMonth = i32Div / 32;
+ i32Div++;
+ while (paiDayOfYear[iMonth + 1] <= i32Div)
+ iMonth++;
+ pTime->u8Month = iMonth + 1;
+ i32Div -= paiDayOfYear[iMonth];
+ pTime->u8MonthDay = i32Div + 1;
+
+ /* This is for UTC timespecs, so, no offset. */
+ pTime->offUTC = 0;
+
+ return pTime;
+}
+RT_EXPORT_SYMBOL(RTTimeExplode);
+
+
+/**
+ * Implodes exploded time to a time spec (UTC).
+ *
+ * @returns pTime on success.
+ * @returns NULL if the pTime data is invalid.
+ * @param pTimeSpec Where to store the imploded UTC time.
+ * If pTime specifies a time which outside the range, maximum or
+ * minimum values will be returned.
+ * @param pTime Pointer to the exploded time to implode.
+ * The fields u8Month, u8WeekDay and u8MonthDay are not used,
+ * and all the other fields are expected to be within their
+ * bounds. Use RTTimeNormalize() or RTTimeLocalNormalize() to
+ * calculate u16YearDay and normalize the ranges of the fields.
+ */
+RTDECL(PRTTIMESPEC) RTTimeImplode(PRTTIMESPEC pTimeSpec, PCRTTIME pTime)
+{
+ int32_t i32Days;
+ uint32_t u32Secs;
+ int64_t i64Nanos;
+
+ /*
+ * Validate input.
+ */
+ AssertReturn(VALID_PTR(pTimeSpec), NULL);
+ AssertReturn(VALID_PTR(pTime), NULL);
+ AssertReturn(pTime->u32Nanosecond < 1000000000, NULL);
+ AssertReturn(pTime->u8Second < 60, NULL);
+ AssertReturn(pTime->u8Minute < 60, NULL);
+ AssertReturn(pTime->u8Hour < 24, NULL);
+ AssertReturn(pTime->u16YearDay >= 1, NULL);
+ AssertReturn(pTime->u16YearDay <= (rtTimeIsLeapYear(pTime->i32Year) ? 366 : 365), NULL);
+ AssertMsgReturn(pTime->i32Year <= RTTIME_MAX_YEAR && pTime->i32Year >= RTTIME_MIN_YEAR, ("%RI32\n", pTime->i32Year), NULL);
+ Assert(pTime->offUTC >= -840 && pTime->offUTC <= 840);
+
+ /*
+ * Do the conversion to nanoseconds.
+ */
+ i32Days = g_aoffYear[pTime->i32Year - OFF_YEAR_IDX_0_YEAR]
+ + pTime->u16YearDay - 1;
+ AssertMsgReturn(i32Days <= RTTIME_MAX_DAY && i32Days >= RTTIME_MIN_DAY, ("%RI32\n", i32Days), NULL);
+
+ u32Secs = pTime->u8Second
+ + pTime->u8Minute * 60
+ + pTime->u8Hour * 3600;
+ i64Nanos = (uint64_t)pTime->u32Nanosecond
+ + u32Secs * UINT64_C(1000000000);
+ AssertMsgReturn(i32Days != RTTIME_MAX_DAY || i64Nanos <= RTTIME_MAX_DAY_NANO, ("%RI64\n", i64Nanos), NULL);
+ AssertMsgReturn(i32Days != RTTIME_MIN_DAY || i64Nanos >= RTTIME_MIN_DAY_NANO, ("%RI64\n", i64Nanos), NULL);
+
+ i64Nanos += i32Days * UINT64_C(86400000000000);
+ if ((pTime->fFlags & RTTIME_FLAGS_TYPE_MASK) == RTTIME_FLAGS_TYPE_LOCAL)
+ i64Nanos -= pTime->offUTC * RT_NS_1MIN;
+
+ pTimeSpec->i64NanosecondsRelativeToUnixEpoch = i64Nanos;
+ return pTimeSpec;
+}
+RT_EXPORT_SYMBOL(RTTimeImplode);
+
+
+/**
+ * Internal worker for RTTimeNormalize and RTTimeLocalNormalize.
+ */
+static PRTTIME rtTimeNormalizeInternal(PRTTIME pTime)
+{
+ unsigned uSecond;
+ unsigned uMinute;
+ unsigned uHour;
+ bool fLeapYear;
+
+ /*
+ * Fix the YearDay and Month/MonthDay.
+ */
+ fLeapYear = rtTimeIsLeapYear(pTime->i32Year);
+ if (!pTime->u16YearDay)
+ {
+ /*
+ * The Month+MonthDay must present, overflow adjust them and calc the year day.
+ */
+ AssertMsgReturn( pTime->u8Month
+ && pTime->u8MonthDay,
+ ("date=%d-%d-%d\n", pTime->i32Year, pTime->u8Month, pTime->u8MonthDay),
+ NULL);
+ while (pTime->u8Month > 12)
+ {
+ pTime->u8Month -= 12;
+ pTime->i32Year++;
+ fLeapYear = rtTimeIsLeapYear(pTime->i32Year);
+ pTime->fFlags &= ~(RTTIME_FLAGS_COMMON_YEAR | RTTIME_FLAGS_LEAP_YEAR);
+ }
+
+ for (;;)
+ {
+ unsigned cDaysInMonth = fLeapYear
+ ? g_acDaysInMonthsLeap[pTime->u8Month - 1]
+ : g_acDaysInMonths[pTime->u8Month - 1];
+ if (pTime->u8MonthDay <= cDaysInMonth)
+ break;
+ pTime->u8MonthDay -= cDaysInMonth;
+ if (pTime->u8Month != 12)
+ pTime->u8Month++;
+ else
+ {
+ pTime->u8Month = 1;
+ pTime->i32Year++;
+ fLeapYear = rtTimeIsLeapYear(pTime->i32Year);
+ pTime->fFlags &= ~(RTTIME_FLAGS_COMMON_YEAR | RTTIME_FLAGS_LEAP_YEAR);
+ }
+ }
+
+ pTime->u16YearDay = pTime->u8MonthDay - 1
+ + (fLeapYear
+ ? g_aiDayOfYearLeap[pTime->u8Month - 1]
+ : g_aiDayOfYear[pTime->u8Month - 1]);
+ }
+ else
+ {
+ /*
+ * Are both YearDay and Month/MonthDay valid?
+ * Check that they don't overflow and match, if not use YearDay (simpler).
+ */
+ bool fRecalc = true;
+ if ( pTime->u8Month
+ && pTime->u8MonthDay)
+ {
+ do
+ {
+ uint16_t u16YearDay;
+
+ /* If you change one, zero the other to make clear what you mean. */
+ AssertBreak(pTime->u8Month <= 12);
+ AssertBreak(pTime->u8MonthDay <= (fLeapYear
+ ? g_acDaysInMonthsLeap[pTime->u8Month - 1]
+ : g_acDaysInMonths[pTime->u8Month - 1]));
+ u16YearDay = pTime->u8MonthDay - 1
+ + (fLeapYear
+ ? g_aiDayOfYearLeap[pTime->u8Month - 1]
+ : g_aiDayOfYear[pTime->u8Month - 1]);
+ AssertBreak(u16YearDay == pTime->u16YearDay);
+ fRecalc = false;
+ } while (0);
+ }
+ if (fRecalc)
+ {
+ const uint16_t *paiDayOfYear;
+
+ /* overflow adjust YearDay */
+ while (pTime->u16YearDay > (fLeapYear ? 366 : 365))
+ {
+ pTime->u16YearDay -= fLeapYear ? 366 : 365;
+ pTime->i32Year++;
+ fLeapYear = rtTimeIsLeapYear(pTime->i32Year);
+ pTime->fFlags &= ~(RTTIME_FLAGS_COMMON_YEAR | RTTIME_FLAGS_LEAP_YEAR);
+ }
+
+ /* calc Month and MonthDay */
+ paiDayOfYear = fLeapYear
+ ? &g_aiDayOfYearLeap[0]
+ : &g_aiDayOfYear[0];
+ pTime->u8Month = 1;
+ while (pTime->u16YearDay >= paiDayOfYear[pTime->u8Month])
+ pTime->u8Month++;
+ Assert(pTime->u8Month >= 1 && pTime->u8Month <= 12);
+ pTime->u8MonthDay = pTime->u16YearDay - paiDayOfYear[pTime->u8Month - 1] + 1;
+ }
+ }
+
+ /*
+ * Fixup time overflows.
+ * Use unsigned int values internally to avoid overflows.
+ */
+ uSecond = pTime->u8Second;
+ uMinute = pTime->u8Minute;
+ uHour = pTime->u8Hour;
+
+ while (pTime->u32Nanosecond >= 1000000000)
+ {
+ pTime->u32Nanosecond -= 1000000000;
+ uSecond++;
+ }
+
+ while (uSecond >= 60)
+ {
+ uSecond -= 60;
+ uMinute++;
+ }
+
+ while (uMinute >= 60)
+ {
+ uMinute -= 60;
+ uHour++;
+ }
+
+ while (uHour >= 24)
+ {
+ uHour -= 24;
+
+ /* This is really a RTTimeIncDay kind of thing... */
+ if (pTime->u16YearDay + 1 != (fLeapYear ? g_aiDayOfYearLeap[pTime->u8Month] : g_aiDayOfYear[pTime->u8Month]))
+ {
+ pTime->u16YearDay++;
+ pTime->u8MonthDay++;
+ }
+ else if (pTime->u8Month != 12)
+ {
+ pTime->u16YearDay++;
+ pTime->u8Month++;
+ pTime->u8MonthDay = 1;
+ }
+ else
+ {
+ pTime->i32Year++;
+ fLeapYear = rtTimeIsLeapYear(pTime->i32Year);
+ pTime->fFlags &= ~(RTTIME_FLAGS_COMMON_YEAR | RTTIME_FLAGS_LEAP_YEAR);
+ pTime->u16YearDay = 1;
+ pTime->u8Month = 1;
+ pTime->u8MonthDay = 1;
+ }
+ }
+
+ pTime->u8Second = uSecond;
+ pTime->u8Minute = uMinute;
+ pTime->u8Hour = uHour;
+
+ /*
+ * Correct the leap year flag.
+ * Assert if it's wrong, but ignore if unset.
+ */
+ if (fLeapYear)
+ {
+ Assert(!(pTime->fFlags & RTTIME_FLAGS_COMMON_YEAR));
+ pTime->fFlags &= ~RTTIME_FLAGS_COMMON_YEAR;
+ pTime->fFlags |= RTTIME_FLAGS_LEAP_YEAR;
+ }
+ else
+ {
+ Assert(!(pTime->fFlags & RTTIME_FLAGS_LEAP_YEAR));
+ pTime->fFlags &= ~RTTIME_FLAGS_LEAP_YEAR;
+ pTime->fFlags |= RTTIME_FLAGS_COMMON_YEAR;
+ }
+
+
+ /*
+ * Calc week day.
+ *
+ * 1970-01-01 was a Thursday (3), so find the number of days relative to
+ * that point. We use the table when possible and a slow+stupid+brute-force
+ * algorithm for points outside it. Feel free to optimize the latter by
+ * using some clever formula.
+ */
+ if ( pTime->i32Year >= OFF_YEAR_IDX_0_YEAR
+ && pTime->i32Year < OFF_YEAR_IDX_0_YEAR + (int32_t)RT_ELEMENTS(g_aoffYear))
+ {
+ int32_t offDays = g_aoffYear[pTime->i32Year - OFF_YEAR_IDX_0_YEAR]
+ + pTime->u16YearDay -1;
+ pTime->u8WeekDay = ((offDays % 7) + 3 + 7) % 7;
+ }
+ else
+ {
+ int32_t i32Year = pTime->i32Year;
+ if (i32Year >= 1970)
+ {
+ uint64_t offDays = pTime->u16YearDay - 1;
+ while (--i32Year >= 1970)
+ offDays += rtTimeIsLeapYear(i32Year) ? 366 : 365;
+ pTime->u8WeekDay = (uint8_t)((offDays + 3) % 7);
+ }
+ else
+ {
+ int64_t offDays = (fLeapYear ? -366 - 1 : -365 - 1) + pTime->u16YearDay;
+ while (++i32Year < 1970)
+ offDays -= rtTimeIsLeapYear(i32Year) ? 366 : 365;
+ pTime->u8WeekDay = ((int)(offDays % 7) + 3 + 7) % 7;
+ }
+ }
+ return pTime;
+}
+
+
+/**
+ * Normalizes the fields of a time structure.
+ *
+ * It is possible to calculate year-day from month/day and vice
+ * versa. If you adjust any of these, make sure to zero the
+ * other so you make it clear which of the fields to use. If
+ * it's ambiguous, the year-day field is used (and you get
+ * assertions in debug builds).
+ *
+ * All the time fields and the year-day or month/day fields will
+ * be adjusted for overflows. (Since all fields are unsigned, there
+ * is no underflows.) It is possible to exploit this for simple
+ * date math, though the recommended way of doing that to implode
+ * the time into a timespec and do the math on that.
+ *
+ * @returns pTime on success.
+ * @returns NULL if the data is invalid.
+ *
+ * @param pTime The time structure to normalize.
+ *
+ * @remarks This function doesn't work with local time, only with UTC time.
+ */
+RTDECL(PRTTIME) RTTimeNormalize(PRTTIME pTime)
+{
+ /*
+ * Validate that we've got the minimum of stuff handy.
+ */
+ AssertReturn(VALID_PTR(pTime), NULL);
+ AssertMsgReturn(!(pTime->fFlags & ~RTTIME_FLAGS_MASK), ("%#x\n", pTime->fFlags), NULL);
+ AssertMsgReturn((pTime->fFlags & RTTIME_FLAGS_TYPE_MASK) != RTTIME_FLAGS_TYPE_LOCAL, ("Use RTTimeLocalNormalize!\n"), NULL);
+ AssertMsgReturn(pTime->offUTC == 0, ("%d; Use RTTimeLocalNormalize!\n", pTime->offUTC), NULL);
+
+ pTime = rtTimeNormalizeInternal(pTime);
+ if (pTime)
+ pTime->fFlags |= RTTIME_FLAGS_TYPE_UTC;
+ return pTime;
+}
+RT_EXPORT_SYMBOL(RTTimeNormalize);
+
+
+/**
+ * Normalizes the fields of a time structure, assuming local time.
+ *
+ * It is possible to calculate year-day from month/day and vice
+ * versa. If you adjust any of these, make sure to zero the
+ * other so you make it clear which of the fields to use. If
+ * it's ambiguous, the year-day field is used (and you get
+ * assertions in debug builds).
+ *
+ * All the time fields and the year-day or month/day fields will
+ * be adjusted for overflows. (Since all fields are unsigned, there
+ * is no underflows.) It is possible to exploit this for simple
+ * date math, though the recommended way of doing that to implode
+ * the time into a timespec and do the math on that.
+ *
+ * @returns pTime on success.
+ * @returns NULL if the data is invalid.
+ *
+ * @param pTime The time structure to normalize.
+ *
+ * @remarks This function doesn't work with UTC time, only with local time.
+ */
+RTDECL(PRTTIME) RTTimeLocalNormalize(PRTTIME pTime)
+{
+ /*
+ * Validate that we've got the minimum of stuff handy.
+ */
+ AssertReturn(VALID_PTR(pTime), NULL);
+ AssertMsgReturn(!(pTime->fFlags & ~RTTIME_FLAGS_MASK), ("%#x\n", pTime->fFlags), NULL);
+ AssertMsgReturn((pTime->fFlags & RTTIME_FLAGS_TYPE_MASK) != RTTIME_FLAGS_TYPE_UTC, ("Use RTTimeNormalize!\n"), NULL);
+
+ pTime = rtTimeNormalizeInternal(pTime);
+ if (pTime)
+ pTime->fFlags |= RTTIME_FLAGS_TYPE_LOCAL;
+ return pTime;
+}
+RT_EXPORT_SYMBOL(RTTimeLocalNormalize);
+
+
+/**
+ * Converts a time spec to a ISO date string.
+ *
+ * @returns psz on success.
+ * @returns NULL on buffer underflow.
+ * @param pTime The time. Caller should've normalized this.
+ * @param psz Where to store the string.
+ * @param cb The size of the buffer.
+ */
+RTDECL(char *) RTTimeToString(PCRTTIME pTime, char *psz, size_t cb)
+{
+ size_t cch;
+
+ /* (Default to UTC if not specified) */
+ if ( (pTime->fFlags & RTTIME_FLAGS_TYPE_MASK) == RTTIME_FLAGS_TYPE_LOCAL
+ && pTime->offUTC)
+ {
+ int32_t offUTC = pTime->offUTC;
+ Assert(offUTC <= 840 && offUTC >= -840);
+ char chSign;
+ if (offUTC >= 0)
+ chSign = '+';
+ else
+ {
+ chSign = '-';
+ offUTC = -offUTC;
+ }
+ uint32_t offUTCHour = (uint32_t)offUTC / 60;
+ uint32_t offUTCMinute = (uint32_t)offUTC % 60;
+ cch = RTStrPrintf(psz, cb,
+ "%RI32-%02u-%02uT%02u:%02u:%02u.%09RU32%c%02d%:02d",
+ pTime->i32Year, pTime->u8Month, pTime->u8MonthDay,
+ pTime->u8Hour, pTime->u8Minute, pTime->u8Second, pTime->u32Nanosecond,
+ chSign, offUTCHour, offUTCMinute);
+ if ( cch <= 15
+ || psz[cch - 6] != chSign)
+ return NULL;
+ }
+ else
+ {
+ cch = RTStrPrintf(psz, cb, "%RI32-%02u-%02uT%02u:%02u:%02u.%09RU32Z",
+ pTime->i32Year, pTime->u8Month, pTime->u8MonthDay,
+ pTime->u8Hour, pTime->u8Minute, pTime->u8Second, pTime->u32Nanosecond);
+ if ( cch <= 15
+ || psz[cch - 1] != 'Z')
+ return NULL;
+ }
+ return psz;
+}
+RT_EXPORT_SYMBOL(RTTimeToString);
+
+
+/**
+ * Converts a time spec to a ISO date string, extended version.
+ *
+ * @returns Output string length on success (positive), VERR_BUFFER_OVERFLOW
+ * (negative) or VERR_OUT_OF_RANGE (negative) on failure.
+ * @param pTime The time. Caller should've normalized this.
+ * @param psz Where to store the string.
+ * @param cb The size of the buffer.
+ * @param cFractionDigits Number of digits in the fraction. Max is 9.
+ */
+RTDECL(ssize_t) RTTimeToStringEx(PCRTTIME pTime, char *psz, size_t cb, unsigned cFractionDigits)
+{
+ size_t cch;
+
+ /* Format the fraction. */
+ char szFraction[16];
+ if (!cFractionDigits)
+ szFraction[0] = '\0';
+ else
+ {
+ AssertReturn(cFractionDigits <= 9, VERR_OUT_OF_RANGE);
+ Assert(pTime->u32Nanosecond <= 999999999);
+ RTStrPrintf(szFraction, sizeof(szFraction), ".%09RU32", pTime->u32Nanosecond);
+ szFraction[cFractionDigits + 1] = '\0';
+ }
+
+ /* (Default to UTC if not specified) */
+ if ( (pTime->fFlags & RTTIME_FLAGS_TYPE_MASK) == RTTIME_FLAGS_TYPE_LOCAL
+ && pTime->offUTC)
+ {
+ int32_t offUTC = pTime->offUTC;
+ Assert(offUTC <= 840 && offUTC >= -840);
+ char chSign;
+ if (offUTC >= 0)
+ chSign = '+';
+ else
+ {
+ chSign = '-';
+ offUTC = -offUTC;
+ }
+ uint32_t offUTCHour = (uint32_t)offUTC / 60;
+ uint32_t offUTCMinute = (uint32_t)offUTC % 60;
+
+ /* Examples: 2018-09-07T16:12:00+02:00 2018-09-07T16:12:00.123456789+02:00 */
+ cch = RTStrPrintf(psz, cb,
+ "%04RI32-%02u-%02uT%02u:%02u:%02u%s%c%02d%:02d",
+ pTime->i32Year, pTime->u8Month, pTime->u8MonthDay,
+ pTime->u8Hour, pTime->u8Minute, pTime->u8Second, szFraction,
+ chSign, offUTCHour, offUTCMinute);
+ if ( cch >= 24
+ && psz[cch - 6] == chSign)
+ return cch;
+ }
+ else
+ {
+ /* Examples: 2018-09-07T16:12:00Z 2018-09-07T16:12:00.123456789Z */
+ cch = RTStrPrintf(psz, cb, "%04RI32-%02u-%02uT%02u:%02u:%02u%sZ",
+ pTime->i32Year, pTime->u8Month, pTime->u8MonthDay,
+ pTime->u8Hour, pTime->u8Minute, pTime->u8Second, szFraction);
+ if ( cch >= 19
+ && psz[cch - 1] == 'Z')
+ return cch;
+ }
+ return VERR_BUFFER_OVERFLOW;
+}
+RT_EXPORT_SYMBOL(RTTimeToStringEx);
+
+
+/**
+ * Converts a time spec to a ISO date string.
+ *
+ * @returns psz on success.
+ * @returns NULL on buffer underflow.
+ * @param pTime The time spec.
+ * @param psz Where to store the string.
+ * @param cb The size of the buffer.
+ */
+RTDECL(char *) RTTimeSpecToString(PCRTTIMESPEC pTime, char *psz, size_t cb)
+{
+ RTTIME Time;
+ return RTTimeToString(RTTimeExplode(&Time, pTime), psz, cb);
+}
+RT_EXPORT_SYMBOL(RTTimeSpecToString);
+
+
+
+/**
+ * Attempts to convert an ISO date string to a time structure.
+ *
+ * We're a little forgiving with zero padding, unspecified parts, and leading
+ * and trailing spaces.
+ *
+ * @retval pTime on success,
+ * @retval NULL on failure.
+ * @param pTime Where to store the time on success.
+ * @param pszString The ISO date string to convert.
+ */
+RTDECL(PRTTIME) RTTimeFromString(PRTTIME pTime, const char *pszString)
+{
+ /* Ignore leading spaces. */
+ while (RT_C_IS_SPACE(*pszString))
+ pszString++;
+
+ /*
+ * Init non date & time parts.
+ */
+ pTime->fFlags = RTTIME_FLAGS_TYPE_LOCAL;
+ pTime->offUTC = 0;
+
+ /*
+ * The date part.
+ */
+
+ /* Year */
+ int rc = RTStrToInt32Ex(pszString, (char **)&pszString, 10, &pTime->i32Year);
+ if (rc != VWRN_TRAILING_CHARS)
+ return NULL;
+
+ bool const fLeapYear = rtTimeIsLeapYear(pTime->i32Year);
+ if (fLeapYear)
+ pTime->fFlags |= RTTIME_FLAGS_LEAP_YEAR;
+
+ if (*pszString++ != '-')
+ return NULL;
+
+ /* Month of the year. */
+ rc = RTStrToUInt8Ex(pszString, (char **)&pszString, 10, &pTime->u8Month);
+ if (rc != VWRN_TRAILING_CHARS)
+ return NULL;
+ if (pTime->u8Month == 0 || pTime->u8Month > 12)
+ return NULL;
+ if (*pszString++ != '-')
+ return NULL;
+
+ /* Day of month.*/
+ rc = RTStrToUInt8Ex(pszString, (char **)&pszString, 10, &pTime->u8MonthDay);
+ if (rc != VWRN_TRAILING_CHARS && rc != VINF_SUCCESS)
+ return NULL;
+ unsigned const cDaysInMonth = fLeapYear
+ ? g_acDaysInMonthsLeap[pTime->u8Month - 1]
+ : g_acDaysInMonths[pTime->u8Month - 1];
+ if (pTime->u8MonthDay == 0 || pTime->u8MonthDay > cDaysInMonth)
+ return NULL;
+
+ /* Calculate year day. */
+ pTime->u16YearDay = pTime->u8MonthDay - 1
+ + (fLeapYear
+ ? g_aiDayOfYearLeap[pTime->u8Month - 1]
+ : g_aiDayOfYear[pTime->u8Month - 1]);
+
+ pTime->u8WeekDay = UINT8_MAX; /* later */
+
+ /*
+ * The time part.
+ */
+ if (*pszString++ != 'T')
+ return NULL;
+
+ /* Hour. */
+ rc = RTStrToUInt8Ex(pszString, (char **)&pszString, 10, &pTime->u8Hour);
+ if (rc != VWRN_TRAILING_CHARS)
+ return NULL;
+ if (pTime->u8Hour > 23)
+ return NULL;
+ if (*pszString++ != ':')
+ return NULL;
+
+ /* Minute. */
+ rc = RTStrToUInt8Ex(pszString, (char **)&pszString, 10, &pTime->u8Minute);
+ if (rc != VWRN_TRAILING_CHARS)
+ return NULL;
+ if (pTime->u8Minute > 59)
+ return NULL;
+ if (*pszString++ != ':')
+ return NULL;
+
+ /* Second. */
+ rc = RTStrToUInt8Ex(pszString, (char **)&pszString, 10, &pTime->u8Second);
+ if (rc != VINF_SUCCESS && rc != VWRN_TRAILING_CHARS && rc != VWRN_TRAILING_SPACES)
+ return NULL;
+ if (pTime->u8Second > 59)
+ return NULL;
+
+ /* We generally put a 9 digit fraction here, but it's entirely optional. */
+ if (*pszString == '.')
+ {
+ const char * const pszStart = ++pszString;
+ rc = RTStrToUInt32Ex(pszString, (char **)&pszString, 10, &pTime->u32Nanosecond);
+ if (rc != VINF_SUCCESS && rc != VWRN_TRAILING_CHARS && rc != VWRN_TRAILING_SPACES)
+ return NULL;
+ if (pTime->u32Nanosecond >= 1000000000)
+ return NULL;
+ switch (pszString - pszStart)
+ {
+ case 1: pTime->u32Nanosecond *= 100000000; break;
+ case 2: pTime->u32Nanosecond *= 10000000; break;
+ case 3: pTime->u32Nanosecond *= 1000000; break;
+ case 4: pTime->u32Nanosecond *= 100000; break;
+ case 5: pTime->u32Nanosecond *= 10000; break;
+ case 6: pTime->u32Nanosecond *= 1000; break;
+ case 7: pTime->u32Nanosecond *= 100; break;
+ case 8: pTime->u32Nanosecond *= 10; break;
+ case 9: break;
+ default:
+ return NULL;
+ }
+ if (pTime->u32Nanosecond >= 1000000000)
+ return NULL;
+ }
+ else
+ pTime->u32Nanosecond = 0;
+
+ /*
+ * Time zone.
+ */
+ if (*pszString == 'Z')
+ {
+ pszString++;
+ pTime->fFlags &= ~RTTIME_FLAGS_TYPE_MASK;
+ pTime->fFlags |= RTTIME_FLAGS_TYPE_UTC;
+ pTime->offUTC = 0;
+ }
+ else if ( *pszString == '+'
+ || *pszString == '-')
+ {
+ int8_t cUtcHours = 0;
+ rc = RTStrToInt8Ex(pszString, (char **)&pszString, 10, &cUtcHours);
+ if (rc != VINF_SUCCESS && rc != VWRN_TRAILING_CHARS && rc != VWRN_TRAILING_SPACES)
+ return NULL;
+ uint8_t cUtcMin = 0;
+ if (*pszString == ':')
+ {
+ rc = RTStrToUInt8Ex(pszString + 1, (char **)&pszString, 10, &cUtcMin);
+ if (rc != VINF_SUCCESS && rc != VWRN_TRAILING_SPACES)
+ return NULL;
+ }
+ else if (*pszString && !RT_C_IS_BLANK(*pszString))
+ return NULL;
+ if (cUtcHours >= 0)
+ pTime->offUTC = cUtcHours * 60 + cUtcMin;
+ else
+ pTime->offUTC = cUtcHours * 60 - cUtcMin;
+ if (RT_ABS(pTime->offUTC) > 840)
+ return NULL;
+ }
+ /* else: No time zone given, local with offUTC = 0. */
+
+ /*
+ * The rest of the string should be blanks.
+ */
+ char ch;
+ while ((ch = *pszString++) != '\0')
+ if (!RT_C_IS_BLANK(ch))
+ return NULL;
+
+ /* Calc week day. */
+ rtTimeNormalizeInternal(pTime);
+ return pTime;
+}
+RT_EXPORT_SYMBOL(RTTimeFromString);
+
+
+/**
+ * Attempts to convert an ISO date string to a time structure.
+ *
+ * We're a little forgiving with zero padding, unspecified parts, and leading
+ * and trailing spaces.
+ *
+ * @retval pTime on success,
+ * @retval NULL on failure.
+ * @param pTime The time spec.
+ * @param pszString The ISO date string to convert.
+ */
+RTDECL(PRTTIMESPEC) RTTimeSpecFromString(PRTTIMESPEC pTime, const char *pszString)
+{
+ RTTIME Time;
+ if (RTTimeFromString(&Time, pszString))
+ return RTTimeImplode(pTime, &Time);
+ return NULL;
+}
+RT_EXPORT_SYMBOL(RTTimeSpecFromString);
+
+
+/**
+ * Formats the given time on a RTC-2822 compliant format.
+ *
+ * @returns Output string length on success (positive), VERR_BUFFER_OVERFLOW
+ * (negative) on failure.
+ * @param pTime The time. Caller should've normalized this.
+ * @param psz Where to store the string.
+ * @param cb The size of the buffer.
+ */
+RTDECL(ssize_t) RTTimeToRfc2822(PRTTIME pTime, char *psz, size_t cb, uint32_t fFlags)
+{
+ Assert(pTime->u8Month > 0 && pTime->u8Month <= 12);
+ Assert(pTime->u8WeekDay < 7);
+ Assert(!(fFlags & ~RTTIME_RFC2822_F_GMT));
+
+ /* (Default to UTC if not specified) */
+ if ( (pTime->fFlags & RTTIME_FLAGS_TYPE_MASK) == RTTIME_FLAGS_TYPE_LOCAL
+ && pTime->offUTC)
+ {
+ Assert(!(fFlags & RTTIME_RFC2822_F_GMT) /* don't call with local time. duh! */ );
+
+ /* Calc the UTC offset part. */
+ int32_t offUtc = pTime->offUTC;
+ Assert(offUtc <= 840 && offUtc >= -840);
+ char chSign;
+ if (offUtc >= 0)
+ chSign = '+';
+ else
+ {
+ chSign = '-';
+ offUtc = -offUtc;
+ }
+ uint32_t offUtcHour = (uint32_t)offUtc / 60;
+ uint32_t offUtcMinute = (uint32_t)offUtc % 60;
+
+ /* Example: "Mon, 31 Aug 2018 00:00:00 +0200" */
+ size_t cch = RTStrPrintf(psz, cb, "%s, %u %s %04RI32 %02u:%02u:%02u %c%02u%02u", g_apszWeekDays[pTime->u8WeekDay],
+ pTime->u8MonthDay, g_apszMonths[pTime->u8Month], pTime->i32Year,
+ pTime->u8Hour, pTime->u8Minute, pTime->u8Second, chSign, offUtcHour, offUtcMinute);
+ if ( cch >= 27
+ && psz[cch - 5] == chSign)
+ return cch;
+ }
+ else if (fFlags & RTTIME_RFC2822_F_GMT)
+ {
+ /* Example: "Mon, 1 Jan 1971 23:55:59 GMT" */
+ size_t cch = RTStrPrintf(psz, cb, "%s, %u %s %04RI32 %02u:%02u:%02u GMT", g_apszWeekDays[pTime->u8WeekDay],
+ pTime->u8MonthDay, g_apszMonths[pTime->u8Month], pTime->i32Year,
+ pTime->u8Hour, pTime->u8Minute, pTime->u8Second);
+ if ( cch >= 27
+ && psz[cch - 1] == 'T')
+ return cch;
+ }
+ else
+ {
+ /* Example: "Mon, 1 Jan 1971 00:00:00 -0000" */
+ size_t cch = RTStrPrintf(psz, cb, "%s, %u %s %04RI32 %02u:%02u:%02u -0000", g_apszWeekDays[pTime->u8WeekDay],
+ pTime->u8MonthDay, g_apszMonths[pTime->u8Month], pTime->i32Year,
+ pTime->u8Hour, pTime->u8Minute, pTime->u8Second);
+ if ( cch >= 27
+ && psz[cch - 5] == '-')
+ return cch;
+ }
+ return VERR_BUFFER_OVERFLOW;
+}
+RT_EXPORT_SYMBOL(RTTimeToRfc2822);
+
+
+/**
+ * Attempts to convert an RFC-2822 date string to a time structure.
+ *
+ * We're a little forgiving with zero padding, unspecified parts, and leading
+ * and trailing spaces.
+ *
+ * @retval pTime on success,
+ * @retval NULL on failure.
+ * @param pTime Where to store the time on success.
+ * @param pszString The ISO date string to convert.
+ */
+RTDECL(PRTTIME) RTTimeFromRfc2822(PRTTIME pTime, const char *pszString)
+{
+ /*
+ * Fri, 31 Aug 2018 00:00:00 +0200
+ * Mon, 3 Sep 2018 00:00:00 GMT
+ * Mon, 3 Sep 2018 00:00:00 -0000
+ * 3 Sep 2018 00:00:00 -0000 (?)
+ * 3 Sep 2018 00:00:00 GMT (?)
+ *
+ */
+
+ /* Ignore leading spaces. */
+ while (RT_C_IS_SPACE(*pszString))
+ pszString++;
+
+ /*
+ * Init non date & time parts.
+ */
+ pTime->fFlags = RTTIME_FLAGS_TYPE_LOCAL;
+ pTime->offUTC = 0;
+
+ /*
+ * The date part.
+ */
+
+ /* Optional day of week: */
+ if (RT_C_IS_ALPHA(pszString[0]) && pszString[1] != '\0')
+ {
+ uint32_t uWeekDay = RT_MAKE_U32_FROM_U8(RT_C_TO_LOWER(pszString[0]), RT_C_TO_LOWER(pszString[1]),
+ RT_C_TO_LOWER(pszString[2]), 0);
+ if ( uWeekDay == RT_MAKE_U32_FROM_U8('m', 'o', 'n', 0)) pTime->u8WeekDay = 0;
+ else if (uWeekDay == RT_MAKE_U32_FROM_U8('t', 'u', 'e', 0)) pTime->u8WeekDay = 1;
+ else if (uWeekDay == RT_MAKE_U32_FROM_U8('w', 'e', 'd', 0)) pTime->u8WeekDay = 2;
+ else if (uWeekDay == RT_MAKE_U32_FROM_U8('t', 'h', 'u', 0)) pTime->u8WeekDay = 3;
+ else if (uWeekDay == RT_MAKE_U32_FROM_U8('f', 'r', 'i', 0)) pTime->u8WeekDay = 4;
+ else if (uWeekDay == RT_MAKE_U32_FROM_U8('s', 'a', 't', 0)) pTime->u8WeekDay = 5;
+ else if (uWeekDay == RT_MAKE_U32_FROM_U8('s', 'u', 'n', 0)) pTime->u8WeekDay = 6;
+ else
+ return NULL;
+ pszString += 3;
+ while (RT_C_IS_ALPHA(*pszString))
+ pszString++;
+ if (*pszString == ',')
+ pszString++;
+ while (RT_C_IS_SPACE(*pszString))
+ pszString++;
+ if (!RT_C_IS_DIGIT(pszString[0]))
+ return NULL;
+ }
+ else if (RT_C_IS_DIGIT(pszString[0]))
+ pTime->u8WeekDay = UINT8_MAX;
+ else
+ return NULL;
+
+ /* Day of month.*/
+ int rc = RTStrToUInt8Ex(pszString, (char **)&pszString, 10, &pTime->u8MonthDay);
+ if (rc != VWRN_TRAILING_CHARS && rc != VINF_SUCCESS)
+ return NULL;
+ while (RT_C_IS_SPACE(*pszString))
+ pszString++;
+
+ /* Month of the year. */
+ if (pszString[0] == '\0' || pszString[1] == '\0' || pszString[2] == '\0')
+ return NULL;
+ uint32_t uMonth = RT_MAKE_U32_FROM_U8(RT_C_TO_LOWER(pszString[0]), RT_C_TO_LOWER(pszString[1]),
+ RT_C_TO_LOWER(pszString[2]), 0);
+ if ( uMonth == RT_MAKE_U32_FROM_U8('j', 'a', 'n', 0)) pTime->u8Month = 1;
+ else if (uMonth == RT_MAKE_U32_FROM_U8('f', 'e', 'b', 0)) pTime->u8Month = 2;
+ else if (uMonth == RT_MAKE_U32_FROM_U8('m', 'a', 'r', 0)) pTime->u8Month = 3;
+ else if (uMonth == RT_MAKE_U32_FROM_U8('a', 'p', 'r', 0)) pTime->u8Month = 4;
+ else if (uMonth == RT_MAKE_U32_FROM_U8('m', 'a', 'y', 0)) pTime->u8Month = 5;
+ else if (uMonth == RT_MAKE_U32_FROM_U8('j', 'u', 'n', 0)) pTime->u8Month = 6;
+ else if (uMonth == RT_MAKE_U32_FROM_U8('j', 'u', 'l', 0)) pTime->u8Month = 7;
+ else if (uMonth == RT_MAKE_U32_FROM_U8('a', 'u', 'g', 0)) pTime->u8Month = 8;
+ else if (uMonth == RT_MAKE_U32_FROM_U8('s', 'e', 'p', 0)) pTime->u8Month = 9;
+ else if (uMonth == RT_MAKE_U32_FROM_U8('o', 'c', 't', 0)) pTime->u8Month = 10;
+ else if (uMonth == RT_MAKE_U32_FROM_U8('n', 'o', 'v', 0)) pTime->u8Month = 11;
+ else if (uMonth == RT_MAKE_U32_FROM_U8('d', 'e', 'c', 0)) pTime->u8Month = 12;
+ else
+ return NULL;
+ pszString += 3;
+ while (RT_C_IS_ALPHA(*pszString))
+ pszString++;
+ while (RT_C_IS_SPACE(*pszString))
+ pszString++;
+
+ /* Year */
+ const char * const pszStartYear = pszString;
+ rc = RTStrToInt32Ex(pszString, (char **)&pszString, 10, &pTime->i32Year);
+ if (rc != VWRN_TRAILING_CHARS)
+ return NULL;
+ if (pszString - pszStartYear >= 4 )
+ { /* likely */ }
+ else if (pszString - pszStartYear == 3)
+ pTime->i32Year += 1900;
+ else if (pszString - pszStartYear == 2)
+ pTime->i32Year += pTime->i32Year >= 50 ? 1900 : 2000;
+ else
+ return NULL;
+
+ bool const fLeapYear = rtTimeIsLeapYear(pTime->i32Year);
+ if (fLeapYear)
+ pTime->fFlags |= RTTIME_FLAGS_LEAP_YEAR;
+
+ while (RT_C_IS_SPACE(*pszString))
+ pszString++;
+
+
+ /* Calculate year day. */
+ unsigned const cDaysInMonth = fLeapYear
+ ? g_acDaysInMonthsLeap[pTime->u8Month - 1]
+ : g_acDaysInMonths[pTime->u8Month - 1];
+ if (pTime->u8MonthDay == 0 || pTime->u8MonthDay > cDaysInMonth)
+ return NULL;
+
+ pTime->u16YearDay = pTime->u8MonthDay - 1
+ + (fLeapYear
+ ? g_aiDayOfYearLeap[pTime->u8Month - 1]
+ : g_aiDayOfYear[pTime->u8Month - 1]);
+
+ /*
+ * The time part.
+ */
+ /* Hour. */
+ rc = RTStrToUInt8Ex(pszString, (char **)&pszString, 10, &pTime->u8Hour);
+ if (rc != VWRN_TRAILING_CHARS)
+ return NULL;
+ if (pTime->u8Hour > 23)
+ return NULL;
+ if (*pszString++ != ':')
+ return NULL;
+
+ /* Minute. */
+ rc = RTStrToUInt8Ex(pszString, (char **)&pszString, 10, &pTime->u8Minute);
+ if (rc != VWRN_TRAILING_CHARS)
+ return NULL;
+ if (pTime->u8Minute > 59)
+ return NULL;
+ if (*pszString++ != ':')
+ return NULL;
+
+ /* Second. */
+ rc = RTStrToUInt8Ex(pszString, (char **)&pszString, 10, &pTime->u8Second);
+ if (rc != VINF_SUCCESS && rc != VWRN_TRAILING_CHARS && rc != VWRN_TRAILING_SPACES)
+ return NULL;
+ if (pTime->u8Second > 59)
+ return NULL;
+
+ /* Non-standard fraction. Handy for testing, though. */
+ if (*pszString == '.')
+ {
+ const char * const pszStart = ++pszString;
+ rc = RTStrToUInt32Ex(pszString, (char **)&pszString, 10, &pTime->u32Nanosecond);
+ if (rc != VINF_SUCCESS && rc != VWRN_TRAILING_CHARS && rc != VWRN_TRAILING_SPACES)
+ return NULL;
+ if (pTime->u32Nanosecond >= 1000000000)
+ return NULL;
+ switch (pszString - pszStart)
+ {
+ case 1: pTime->u32Nanosecond *= 100000000; break;
+ case 2: pTime->u32Nanosecond *= 10000000; break;
+ case 3: pTime->u32Nanosecond *= 1000000; break;
+ case 4: pTime->u32Nanosecond *= 100000; break;
+ case 5: pTime->u32Nanosecond *= 10000; break;
+ case 6: pTime->u32Nanosecond *= 1000; break;
+ case 7: pTime->u32Nanosecond *= 100; break;
+ case 8: pTime->u32Nanosecond *= 10; break;
+ case 9: break;
+ default:
+ return NULL;
+ }
+ if (pTime->u32Nanosecond >= 1000000000)
+ return NULL;
+ }
+ else
+ pTime->u32Nanosecond = 0;
+ while (RT_C_IS_SPACE(*pszString))
+ pszString++;
+
+ /*
+ * Time zone.
+ */
+ if ( *pszString == '+'
+ || *pszString == '-')
+ {
+ if ( !RT_C_IS_DIGIT(pszString[1])
+ || !RT_C_IS_DIGIT(pszString[2]))
+ return NULL;
+ int8_t cUtcHours = (pszString[1] - '0') * 10 + (pszString[2] - '0');
+ char chSign = *pszString;
+ if (chSign == '-')
+ cUtcHours = -cUtcHours;
+ pszString += 3;
+
+ uint8_t cUtcMin = 0;
+ if (RT_C_IS_DIGIT(pszString[0]))
+ {
+ rc = RTStrToUInt8Ex(pszString, (char **)&pszString, 10, &cUtcMin);
+ if (rc != VINF_SUCCESS && rc != VWRN_TRAILING_SPACES)
+ return NULL;
+ }
+ else if (*pszString && !RT_C_IS_BLANK(*pszString))
+ return NULL;
+ if (cUtcHours >= 0)
+ pTime->offUTC = cUtcHours * 60 + cUtcMin;
+ else
+ pTime->offUTC = cUtcHours * 60 - cUtcMin;
+ if (RT_ABS(pTime->offUTC) > 840)
+ return NULL;
+
+ /* -0000: GMT isn't necessarily the local time zone, so change flags from local to UTC. */
+ if (pTime->offUTC == 0 && chSign == '-')
+ {
+ pTime->fFlags &= ~RTTIME_FLAGS_TYPE_MASK;
+ pTime->fFlags |= RTTIME_FLAGS_TYPE_UTC;
+ }
+ }
+ else if (RT_C_IS_ALPHA(*pszString))
+ {
+ uint32_t uTimeZone = RT_MAKE_U32_FROM_U8(RT_C_TO_LOWER(pszString[0]), RT_C_TO_LOWER(pszString[1]),
+ RT_C_TO_LOWER(pszString[2]), 0);
+ if (uTimeZone == RT_MAKE_U32_FROM_U8('g', 'm', 't', 0))
+ {
+ pTime->fFlags &= ~RTTIME_FLAGS_TYPE_MASK;
+ pTime->fFlags |= RTTIME_FLAGS_TYPE_UTC;
+ pTime->offUTC = 0;
+ pszString += 3;
+ }
+ else if ((uint16_t)uTimeZone == RT_MAKE_U16('u', 't'))
+ {
+ pTime->fFlags &= ~RTTIME_FLAGS_TYPE_MASK;
+ pTime->fFlags |= RTTIME_FLAGS_TYPE_UTC;
+ pTime->offUTC = 0;
+ pszString += 2;
+ }
+ else
+ {
+ static const struct { uint32_t uTimeZone; int32_t offUtc; } s_aLegacyTimeZones[] =
+ {
+ { RT_MAKE_U32_FROM_U8('e', 'd', 't', 0), -4*60 },
+ { RT_MAKE_U32_FROM_U8('e', 's', 't', 0), -5*60 },
+ { RT_MAKE_U32_FROM_U8('c', 'd', 't', 0), -5*60 },
+ { RT_MAKE_U32_FROM_U8('c', 's', 't', 0), -6*60 },
+ { RT_MAKE_U32_FROM_U8('m', 'd', 't', 0), -6*60 },
+ { RT_MAKE_U32_FROM_U8('m', 's', 't', 0), -7*60 },
+ { RT_MAKE_U32_FROM_U8('p', 'd', 't', 0), -7*60 },
+ { RT_MAKE_U32_FROM_U8('p', 's', 't', 0), -8*60 },
+ };
+ size_t i = RT_ELEMENTS(s_aLegacyTimeZones);
+ while (i-- > 0)
+ if (s_aLegacyTimeZones[i].uTimeZone == uTimeZone)
+ {
+ pTime->fFlags &= ~RTTIME_FLAGS_TYPE_MASK;
+ pTime->fFlags |= RTTIME_FLAGS_TYPE_LOCAL;
+ pTime->offUTC = s_aLegacyTimeZones[i].offUtc;
+ pszString += 3;
+ break;
+ }
+ }
+
+ }
+ /* else: No time zone given, local with offUTC = 0. */
+
+ /*
+ * The rest of the string should be blanks.
+ */
+ char ch;
+ while ((ch = *pszString++) != '\0')
+ if (!RT_C_IS_BLANK(ch))
+ return NULL;
+
+ rtTimeNormalizeInternal(pTime);
+ return pTime;
+}
+RT_EXPORT_SYMBOL(RTTimeFromRfc2822);
+
+
+/**
+ * Adds one day to @a pTime.
+ *
+ * ASSUMES it is zulu time so DST can be ignored.
+ */
+static PRTTIME rtTimeAdd1Day(PRTTIME pTime)
+{
+ Assert(!pTime->offUTC);
+ rtTimeNormalizeInternal(pTime);
+ pTime->u8MonthDay += 1;
+ pTime->u16YearDay = 0;
+ return rtTimeNormalizeInternal(pTime);
+}
+
+
+/**
+ * Subtracts one day from @a pTime.
+ *
+ * ASSUMES it is zulu time so DST can be ignored.
+ */
+static PRTTIME rtTimeSub1Day(PRTTIME pTime)
+{
+ Assert(!pTime->offUTC);
+ rtTimeNormalizeInternal(pTime);
+ if (pTime->u16YearDay > 1)
+ {
+ pTime->u16YearDay -= 1;
+ pTime->u8Month = 0;
+ pTime->u8MonthDay = 0;
+ }
+ else
+ {
+ pTime->i32Year -= 1;
+ pTime->u16YearDay = rtTimeIsLeapYear(pTime->i32Year) ? 366 : 365;
+ pTime->u8MonthDay = 31;
+ pTime->u8Month = 12;
+ pTime->fFlags &= ~(RTTIME_FLAGS_COMMON_YEAR | RTTIME_FLAGS_LEAP_YEAR);
+ }
+ return rtTimeNormalizeInternal(pTime);
+}
+
+
+/**
+ * Adds a signed number of minutes to @a pTime.
+ *
+ * ASSUMES it is zulu time so DST can be ignored.
+ *
+ * @param pTime The time structure to work on.
+ * @param cAddend Number of minutes to add.
+ * ASSUMES the value isn't all that high!
+ */
+static PRTTIME rtTimeAddMinutes(PRTTIME pTime, int32_t cAddend)
+{
+ Assert(RT_ABS(cAddend) < 31 * 24 * 60);
+
+ /*
+ * Work on minutes of the day.
+ */
+ int32_t const cMinutesInDay = 24 * 60;
+ int32_t iDayMinute = (unsigned)pTime->u8Hour * 60 + pTime->u8Minute;
+ iDayMinute += cAddend;
+
+ while (iDayMinute >= cMinutesInDay)
+ {
+ rtTimeAdd1Day(pTime);
+ iDayMinute -= cMinutesInDay;
+ }
+
+ while (iDayMinute < 0)
+ {
+ rtTimeSub1Day(pTime);
+ iDayMinute += cMinutesInDay;
+ }
+
+ pTime->u8Hour = iDayMinute / 60;
+ pTime->u8Minute = iDayMinute % 60;
+
+ return pTime;
+}
+
+
+/**
+ * Converts @a pTime to zulu time (UTC) if needed.
+ *
+ * @returns pTime.
+ * @param pTime What to convert (in/out).
+ */
+static PRTTIME rtTimeConvertToZulu(PRTTIME pTime)
+{
+ RTTIME_ASSERT_NORMALIZED(pTime);
+ if ((pTime->fFlags & RTTIME_FLAGS_TYPE_MASK) != RTTIME_FLAGS_TYPE_UTC)
+ {
+ int32_t offUTC = pTime->offUTC;
+ pTime->offUTC = 0;
+ pTime->fFlags &= ~RTTIME_FLAGS_TYPE_MASK;
+ pTime->fFlags |= RTTIME_FLAGS_TYPE_UTC;
+ if (offUTC != 0)
+ rtTimeAddMinutes(pTime, -offUTC);
+ }
+ return pTime;
+}
+
+
+/**
+ * Converts a time structure to UTC, relying on UTC offset information if it contains local time.
+ *
+ * @returns pTime on success.
+ * @returns NULL if the data is invalid.
+ * @param pTime The time structure to convert.
+ */
+RTDECL(PRTTIME) RTTimeConvertToZulu(PRTTIME pTime)
+{
+ /*
+ * Validate that we've got the minimum of stuff handy.
+ */
+ AssertReturn(VALID_PTR(pTime), NULL);
+ AssertMsgReturn(!(pTime->fFlags & ~RTTIME_FLAGS_MASK), ("%#x\n", pTime->fFlags), NULL);
+
+ return rtTimeConvertToZulu(rtTimeNormalizeInternal(pTime));
+}
+RT_EXPORT_SYMBOL(RTTimeConvertToZulu);
+
+
+/**
+ * Compares two normalized time structures.
+ *
+ * @retval 0 if equal.
+ * @retval -1 if @a pLeft is earlier than @a pRight.
+ * @retval 1 if @a pRight is earlier than @a pLeft.
+ *
+ * @param pLeft The left side time. NULL is accepted.
+ * @param pRight The right side time. NULL is accepted.
+ *
+ * @note A NULL time is considered smaller than anything else. If both are
+ * NULL, they are considered equal.
+ */
+RTDECL(int) RTTimeCompare(PCRTTIME pLeft, PCRTTIME pRight)
+{
+#ifdef RT_STRICT
+ if (pLeft)
+ RTTIME_ASSERT_NORMALIZED(pLeft);
+ if (pRight)
+ RTTIME_ASSERT_NORMALIZED(pRight);
+#endif
+
+ int iRet;
+ if (pLeft)
+ {
+ if (pRight)
+ {
+ /*
+ * Only work with normalized zulu time.
+ */
+ RTTIME TmpLeft;
+ if ( pLeft->offUTC != 0
+ || pLeft->u16YearDay == 0
+ || pLeft->u16YearDay > 366
+ || pLeft->u8Hour >= 60
+ || pLeft->u8Minute >= 60
+ || pLeft->u8Second >= 60)
+ {
+ TmpLeft = *pLeft;
+ pLeft = rtTimeConvertToZulu(rtTimeNormalizeInternal(&TmpLeft));
+ }
+
+ RTTIME TmpRight;
+ if ( pRight->offUTC != 0
+ || pRight->u16YearDay == 0
+ || pRight->u16YearDay > 366
+ || pRight->u8Hour >= 60
+ || pRight->u8Minute >= 60
+ || pRight->u8Second >= 60)
+ {
+ TmpRight = *pRight;
+ pRight = rtTimeConvertToZulu(rtTimeNormalizeInternal(&TmpRight));
+ }
+
+ /*
+ * Do the comparison.
+ */
+ if ( pLeft->i32Year != pRight->i32Year)
+ iRet = pLeft->i32Year < pRight->i32Year ? -1 : 1;
+ else if ( pLeft->u16YearDay != pRight->u16YearDay)
+ iRet = pLeft->u16YearDay < pRight->u16YearDay ? -1 : 1;
+ else if ( pLeft->u8Hour != pRight->u8Hour)
+ iRet = pLeft->u8Hour < pRight->u8Hour ? -1 : 1;
+ else if ( pLeft->u8Minute != pRight->u8Minute)
+ iRet = pLeft->u8Minute < pRight->u8Minute ? -1 : 1;
+ else if ( pLeft->u8Second != pRight->u8Second)
+ iRet = pLeft->u8Second < pRight->u8Second ? -1 : 1;
+ else if ( pLeft->u32Nanosecond != pRight->u32Nanosecond)
+ iRet = pLeft->u32Nanosecond < pRight->u32Nanosecond ? -1 : 1;
+ else
+ iRet = 0;
+ }
+ else
+ iRet = 1;
+ }
+ else
+ iRet = pRight ? -1 : 0;
+ return iRet;
+}
+RT_EXPORT_SYMBOL(RTTimeCompare);
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-19 09:14:26 +0000