time.cpp@ 72164

Last change on this file since 72164 was 72164, checked in by vboxsync, 7 years ago
RTTimeImplode: Don't use rtTimeConvertToZulu for applying offUTC.
Property svn:eol-style set to `native` Property svn:keywords set to `Id Revision`
File size: 44.5 KB

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1	/* $Id: time.cpp 72164 2018-05-08 13:41:23Z vboxsync $ */
2	/** @file
3	* IPRT - Time.
4	*/
5
6	/*
7	* Copyright (C) 2006-2017 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.215389.xyz. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*/
26
27
28	/*********************************************************************************************************************************
29	* Header Files *
30	*********************************************************************************************************************************/
31	#define LOG_GROUP RTLOGGROUP_TIME
32	#include <iprt/time.h>
33	#include "internal/iprt.h"
34
35	#include <iprt/ctype.h>
36	#include <iprt/string.h>
37	#include <iprt/assert.h>
38	#include "internal/time.h"
39
40
41	/*********************************************************************************************************************************
42	* Defined Constants And Macros *
43	*********************************************************************************************************************************/
44	/** The max year we possibly could implode. */
45	#define RTTIME_MAX_YEAR (292 + 1970)
46	/** The min year we possibly could implode. */
47	#define RTTIME_MIN_YEAR (-293 + 1970)
48
49	/** The max day supported by our time representation. (2262-04-11T23-47-16.854775807) */
50	#define RTTIME_MAX_DAY (365*292+71 + 101-1)
51	/** The min day supported by our time representation. (1677-09-21T00-12-43.145224192) */
52	#define RTTIME_MIN_DAY (365*-293-70 + 264-1)
53
54	/** The max nano second into the max day. (2262-04-11T23-47-16.854775807) */
55	#define RTTIME_MAX_DAY_NANO ( INT64_C(1000000000) * (233600 + 4760 + 16) + 854775807 )
56	/** The min nano second into the min day. (1677-09-21T00-12-43.145224192) */
57	#define RTTIME_MIN_DAY_NANO ( INT64_C(1000000000) * (003600 + 1260 + 43) + 145224192 )
58
59	/**
60	* Asserts that a_pTime is normalized.
61	*/
62	#define RTTIME_ASSERT_NORMALIZED(a_pTime) \
63	do \
64	{ \
65	Assert(RT_ABS((a_pTime)->offUTC) <= 840); \
66	Assert((a_pTime)->u32Nanosecond < 1000000000); \
67	Assert((a_pTime)->u8Second < 60); \
68	Assert((a_pTime)->u8Minute < 60); \
69	Assert((a_pTime)->u8Hour < 24); \
70	Assert((a_pTime)->u8Month >= 1 && (a_pTime)->u8Month <= 12); \
71	Assert((a_pTime)->u8WeekDay < 7); \
72	Assert((a_pTime)->u16YearDay >= 1); \
73	Assert((a_pTime)->u16YearDay <= (rtTimeIsLeapYear((a_pTime)->i32Year) ? 366 : 365)); \
74	Assert((a_pTime)->u8MonthDay >= 1 && (a_pTime)->u8MonthDay <= 31); \
75	} while (0)
76
77
78	/*********************************************************************************************************************************
79	* Global Variables *
80	*********************************************************************************************************************************/
81	/**
82	* Days per month in a common year.
83	*/
84	static const uint8_t g_acDaysInMonths[12] =
85	{
86	/Jan Feb Mar Arp May Jun Jul Aug Sep Oct Nov Dec /
87	31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
88	};
89
90	/**
91	* Days per month in a leap year.
92	*/
93	static const uint8_t g_acDaysInMonthsLeap[12] =
94	{
95	/Jan Feb Mar Arp May Jun Jul Aug Sep Oct Nov Dec /
96	31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
97	};
98
99	/**
100	* The day of year for each month in a common year.
101	*/
102	static const uint16_t g_aiDayOfYear[12 + 1] =
103	{
104	1, /* Jan */
105	1+31, /* Feb */
106	1+31+28, /* Mar */
107	1+31+28+31, /* Apr */
108	1+31+28+31+30, /* May */
109	1+31+28+31+30+31, /* Jun */
110	1+31+28+31+30+31+30, /* Jul */
111	1+31+28+31+30+31+30+31, /* Aug */
112	1+31+28+31+30+31+30+31+31, /* Sep */
113	1+31+28+31+30+31+30+31+31+30, /* Oct */
114	1+31+28+31+30+31+30+31+31+30+31, /* Nov */
115	1+31+28+31+30+31+30+31+31+30+31+30, /* Dec */
116	1+31+28+31+30+31+30+31+31+30+31+30+31
117	};
118
119	/**
120	* The day of year for each month in a leap year.
121	*/
122	static const uint16_t g_aiDayOfYearLeap[12 + 1] =
123	{
124	1, /* Jan */
125	1+31, /* Feb */
126	1+31+29, /* Mar */
127	1+31+29+31, /* Apr */
128	1+31+29+31+30, /* May */
129	1+31+29+31+30+31, /* Jun */
130	1+31+29+31+30+31+30, /* Jul */
131	1+31+29+31+30+31+30+31, /* Aug */
132	1+31+29+31+30+31+30+31+31, /* Sep */
133	1+31+29+31+30+31+30+31+31+30, /* Oct */
134	1+31+29+31+30+31+30+31+31+30+31, /* Nov */
135	1+31+29+31+30+31+30+31+31+30+31+30, /* Dec */
136	1+31+29+31+30+31+30+31+31+30+31+30+31
137	};
138
139	/** The index of 1970 in g_aoffYear */
140	#define OFF_YEAR_IDX_EPOCH 300
141	/** The year of the first index. */
142	#define OFF_YEAR_IDX_0_YEAR 1670
143
144	/**
145	* The number of days the 1st of January a year is offseted from 1970-01-01.
146	*/
147	static const int32_t g_aoffYear[] =
148	{
149	/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,
150	/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,
151	/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,
152	/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,
153	/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,
154	/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,
155	/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,
156	/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,
157	/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,
158	/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,
159	/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,
160	/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,
161	/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,
162	/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,
163	/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,
164	/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,
165	/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,
166	/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,
167	/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,
168	/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,
169	/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,
170	/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,
171	/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,
172	/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,
173	/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,
174	/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,
175	/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 ,
176	/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 ,
177	/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 ,
178	/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 ,
179	/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 ,
180	/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 ,
181	/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 ,
182	/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 ,
183	/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 ,
184	/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 ,
185	/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 ,
186	/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 ,
187	/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 ,
188	/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 ,
189	/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 ,
190	/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 ,
191	/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 ,
192	/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 ,
193	/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 ,
194	/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 ,
195	/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 ,
196	/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 ,
197	/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 ,
198	/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 ,
199	/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 ,
200	/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 ,
201	/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 ,
202	/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 ,
203	/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 ,
204	/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 ,
205	/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 ,
206	/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 ,
207	/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 ,
208	/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
209	};
210
211	/* generator code:
212	#include <stdio.h>
213	bool isLeapYear(int iYear)
214	{
215	return iYear % 4 == 0 && (iYear % 100 != 0 \|\| iYear % 400 == 0);
216	}
217	void printYear(int iYear, int iLeap)
218	{
219	if (!(iYear % 10))
220	printf("\n/" "%d:" "/", iYear + 1970);
221	printf(" 365*%4d+%-3d,", iYear, iLeap);
222	}
223	int main()
224	{
225	int iYear = 0;
226	int iLeap = 0;
227	while (iYear > -300)
228	iLeap -= isLeapYear(1970 + --iYear);
229	while (iYear < 300)
230	{
231	printYear(iYear, iLeap);
232	iLeap += isLeapYear(1970 + iYear++);
233	}
234	printf("\n");
235	return 0;
236	}
237	*/
238
239	/*********************************************************************************************************************************
240	* Internal Functions *
241	*********************************************************************************************************************************/
242	static PRTTIME rtTimeConvertToZulu(PRTTIME pTime);
243
244
245	/**
246	* Checks if a year is a leap year or not.
247	*
248	* @returns true if it's a leap year.
249	* @returns false if it's a common year.
250	* @param i32Year The year in question.
251	*/
252	DECLINLINE(bool) rtTimeIsLeapYear(int32_t i32Year)
253	{
254	return i32Year % 4 == 0
255	&& ( i32Year % 100 != 0
256	\|\| i32Year % 400 == 0);
257	}
258
259
260	/**
261	* Checks if a year is a leap year or not.
262	*
263	* @returns true if it's a leap year.
264	* @returns false if it's a common year.
265	* @param i32Year The year in question.
266	*/
267	RTDECL(bool) RTTimeIsLeapYear(int32_t i32Year)
268	{
269	return rtTimeIsLeapYear(i32Year);
270	}
271	RT_EXPORT_SYMBOL(RTTimeIsLeapYear);
272
273
274	/**
275	* Explodes a time spec (UTC).
276	*
277	* @returns pTime.
278	* @param pTime Where to store the exploded time.
279	* @param pTimeSpec The time spec to exploded.
280	*/
281	RTDECL(PRTTIME) RTTimeExplode(PRTTIME pTime, PCRTTIMESPEC pTimeSpec)
282	{
283	int64_t i64Div;
284	int32_t i32Div;
285	int32_t i32Rem;
286	unsigned iYear;
287	const uint16_t *paiDayOfYear;
288	int iMonth;
289
290	AssertMsg(VALID_PTR(pTime), ("%p\n", pTime));
291	AssertMsg(VALID_PTR(pTimeSpec), ("%p\n", pTime));
292
293	/*
294	* The simple stuff first.
295	*/
296	pTime->fFlags = RTTIME_FLAGS_TYPE_UTC;
297	i64Div = pTimeSpec->i64NanosecondsRelativeToUnixEpoch;
298	i32Rem = (int32_t)(i64Div % 1000000000);
299	i64Div /= 1000000000;
300	if (i32Rem < 0)
301	{
302	i32Rem += 1000000000;
303	i64Div--;
304	}
305	pTime->u32Nanosecond = i32Rem;
306
307	/* second */
308	i32Rem = (int32_t)(i64Div % 60);
309	i64Div /= 60;
310	if (i32Rem < 0)
311	{
312	i32Rem += 60;
313	i64Div--;
314	}
315	pTime->u8Second = i32Rem;
316
317	/* minute */
318	i32Div = (int32_t)i64Div; /* 60,000,000,000 > 33bit, so 31bit suffices. */
319	i32Rem = i32Div % 60;
320	i32Div /= 60;
321	if (i32Rem < 0)
322	{
323	i32Rem += 60;
324	i32Div--;
325	}
326	pTime->u8Minute = i32Rem;
327
328	/* hour */
329	i32Rem = i32Div % 24;
330	i32Div /= 24; /* days relative to 1970-01-01 */
331	if (i32Rem < 0)
332	{
333	i32Rem += 24;
334	i32Div--;
335	}
336	pTime->u8Hour = i32Rem;
337
338	/* weekday - 1970-01-01 was a Thursday (3) */
339	pTime->u8WeekDay = ((int)(i32Div % 7) + 3 + 7) % 7;
340
341	/*
342	* We've now got a number of days relative to 1970-01-01.
343	* To get the correct year number we have to mess with leap years. Fortunately,
344	* the representation we've got only supports a few hundred years, so we can
345	* generate a table and perform a simple two way search from the modulus 365 derived.
346	*/
347	iYear = OFF_YEAR_IDX_EPOCH + i32Div / 365;
348	while (g_aoffYear[iYear + 1] <= i32Div)
349	iYear++;
350	while (g_aoffYear[iYear] > i32Div)
351	iYear--;
352	pTime->i32Year = iYear + OFF_YEAR_IDX_0_YEAR;
353	i32Div -= g_aoffYear[iYear];
354	pTime->u16YearDay = i32Div + 1;
355
356	/*
357	* Figuring out the month is done in a manner similar to the year, only here we
358	* ensure that the index is matching or too small.
359	*/
360	if (rtTimeIsLeapYear(pTime->i32Year))
361	{
362	pTime->fFlags \|= RTTIME_FLAGS_LEAP_YEAR;
363	paiDayOfYear = &g_aiDayOfYearLeap[0];
364	}
365	else
366	{
367	pTime->fFlags \|= RTTIME_FLAGS_COMMON_YEAR;
368	paiDayOfYear = &g_aiDayOfYear[0];
369	}
370	iMonth = i32Div / 32;
371	i32Div++;
372	while (paiDayOfYear[iMonth + 1] <= i32Div)
373	iMonth++;
374	pTime->u8Month = iMonth + 1;
375	i32Div -= paiDayOfYear[iMonth];
376	pTime->u8MonthDay = i32Div + 1;
377
378	/* This is for UTC timespecs, so, no offset. */
379	pTime->offUTC = 0;
380
381	return pTime;
382	}
383	RT_EXPORT_SYMBOL(RTTimeExplode);
384
385
386	/**
387	* Implodes exploded time to a time spec (UTC).
388	*
389	* @returns pTime on success.
390	* @returns NULL if the pTime data is invalid.
391	* @param pTimeSpec Where to store the imploded UTC time.
392	* If pTime specifies a time which outside the range, maximum or
393	* minimum values will be returned.
394	* @param pTime Pointer to the exploded time to implode.
395	* The fields u8Month, u8WeekDay and u8MonthDay are not used,
396	* and all the other fields are expected to be within their
397	* bounds. Use RTTimeNormalize() or RTTimeLocalNormalize() to
398	* calculate u16YearDay and normalize the ranges of the fields.
399	*/
400	RTDECL(PRTTIMESPEC) RTTimeImplode(PRTTIMESPEC pTimeSpec, PCRTTIME pTime)
401	{
402	int32_t i32Days;
403	uint32_t u32Secs;
404	int64_t i64Nanos;
405
406	/*
407	* Validate input.
408	*/
409	AssertReturn(VALID_PTR(pTimeSpec), NULL);
410	AssertReturn(VALID_PTR(pTime), NULL);
411	AssertReturn(pTime->u32Nanosecond < 1000000000, NULL);
412	AssertReturn(pTime->u8Second < 60, NULL);
413	AssertReturn(pTime->u8Minute < 60, NULL);
414	AssertReturn(pTime->u8Hour < 24, NULL);
415	AssertReturn(pTime->u16YearDay >= 1, NULL);
416	AssertReturn(pTime->u16YearDay <= (rtTimeIsLeapYear(pTime->i32Year) ? 366 : 365), NULL);
417	AssertMsgReturn(pTime->i32Year <= RTTIME_MAX_YEAR && pTime->i32Year >= RTTIME_MIN_YEAR, ("%RI32\n", pTime->i32Year), NULL);
418	Assert(pTime->offUTC >= -840 && pTime->offUTC <= 840);
419
420	/*
421	* Do the conversion to nanoseconds.
422	*/
423	i32Days = g_aoffYear[pTime->i32Year - OFF_YEAR_IDX_0_YEAR]
424	+ pTime->u16YearDay - 1;
425	AssertMsgReturn(i32Days <= RTTIME_MAX_DAY && i32Days >= RTTIME_MIN_DAY, ("%RI32\n", i32Days), NULL);
426
427	u32Secs = pTime->u8Second
428	+ pTime->u8Minute * 60
429	+ pTime->u8Hour * 3600;
430	i64Nanos = (uint64_t)pTime->u32Nanosecond
431	+ u32Secs * UINT64_C(1000000000);
432	AssertMsgReturn(i32Days != RTTIME_MAX_DAY \|\| i64Nanos <= RTTIME_MAX_DAY_NANO, ("%RI64\n", i64Nanos), NULL);
433	AssertMsgReturn(i32Days != RTTIME_MIN_DAY \|\| i64Nanos >= RTTIME_MIN_DAY_NANO, ("%RI64\n", i64Nanos), NULL);
434
435	i64Nanos += i32Days * UINT64_C(86400000000000);
436	if ((pTime->fFlags & RTTIME_FLAGS_TYPE_MASK) == RTTIME_FLAGS_TYPE_LOCAL)
437	i64Nanos -= pTime->offUTC * RT_NS_1MIN;
438
439	pTimeSpec->i64NanosecondsRelativeToUnixEpoch = i64Nanos;
440	return pTimeSpec;
441	}
442	RT_EXPORT_SYMBOL(RTTimeImplode);
443
444
445	/**
446	* Internal worker for RTTimeNormalize and RTTimeLocalNormalize.
447	*/
448	static PRTTIME rtTimeNormalizeInternal(PRTTIME pTime)
449	{
450	unsigned uSecond;
451	unsigned uMinute;
452	unsigned uHour;
453	bool fLeapYear;
454
455	/*
456	* Fix the YearDay and Month/MonthDay.
457	*/
458	fLeapYear = rtTimeIsLeapYear(pTime->i32Year);
459	if (!pTime->u16YearDay)
460	{
461	/*
462	* The Month+MonthDay must present, overflow adjust them and calc the year day.
463	*/
464	AssertMsgReturn( pTime->u8Month
465	&& pTime->u8MonthDay,
466	("date=%d-%d-%d\n", pTime->i32Year, pTime->u8Month, pTime->u8MonthDay),
467	NULL);
468	while (pTime->u8Month > 12)
469	{
470	pTime->u8Month -= 12;
471	pTime->i32Year++;
472	fLeapYear = rtTimeIsLeapYear(pTime->i32Year);
473	pTime->fFlags &= ~(RTTIME_FLAGS_COMMON_YEAR \| RTTIME_FLAGS_LEAP_YEAR);
474	}
475
476	for (;;)
477	{
478	unsigned cDaysInMonth = fLeapYear
479	? g_acDaysInMonthsLeap[pTime->u8Month - 1]
480	: g_acDaysInMonths[pTime->u8Month - 1];
481	if (pTime->u8MonthDay <= cDaysInMonth)
482	break;
483	pTime->u8MonthDay -= cDaysInMonth;
484	if (pTime->u8Month != 12)
485	pTime->u8Month++;
486	else
487	{
488	pTime->u8Month = 1;
489	pTime->i32Year++;
490	fLeapYear = rtTimeIsLeapYear(pTime->i32Year);
491	pTime->fFlags &= ~(RTTIME_FLAGS_COMMON_YEAR \| RTTIME_FLAGS_LEAP_YEAR);
492	}
493	}
494
495	pTime->u16YearDay = pTime->u8MonthDay - 1
496	+ (fLeapYear
497	? g_aiDayOfYearLeap[pTime->u8Month - 1]
498	: g_aiDayOfYear[pTime->u8Month - 1]);
499	}
500	else
501	{
502	/*
503	* Are both YearDay and Month/MonthDay valid?
504	* Check that they don't overflow and match, if not use YearDay (simpler).
505	*/
506	bool fRecalc = true;
507	if ( pTime->u8Month
508	&& pTime->u8MonthDay)
509	{
510	do
511	{
512	uint16_t u16YearDay;
513
514	/* If you change one, zero the other to make clear what you mean. */
515	AssertBreak(pTime->u8Month <= 12);
516	AssertBreak(pTime->u8MonthDay <= (fLeapYear
517	? g_acDaysInMonthsLeap[pTime->u8Month - 1]
518	: g_acDaysInMonths[pTime->u8Month - 1]));
519	u16YearDay = pTime->u8MonthDay - 1
520	+ (fLeapYear
521	? g_aiDayOfYearLeap[pTime->u8Month - 1]
522	: g_aiDayOfYear[pTime->u8Month - 1]);
523	AssertBreak(u16YearDay == pTime->u16YearDay);
524	fRecalc = false;
525	} while (0);
526	}
527	if (fRecalc)
528	{
529	const uint16_t *paiDayOfYear;
530
531	/* overflow adjust YearDay */
532	while (pTime->u16YearDay > (fLeapYear ? 366 : 365))
533	{
534	pTime->u16YearDay -= fLeapYear ? 366 : 365;
535	pTime->i32Year++;
536	fLeapYear = rtTimeIsLeapYear(pTime->i32Year);
537	pTime->fFlags &= ~(RTTIME_FLAGS_COMMON_YEAR \| RTTIME_FLAGS_LEAP_YEAR);
538	}
539
540	/* calc Month and MonthDay */
541	paiDayOfYear = fLeapYear
542	? &g_aiDayOfYearLeap[0]
543	: &g_aiDayOfYear[0];
544	pTime->u8Month = 1;
545	while (pTime->u16YearDay >= paiDayOfYear[pTime->u8Month])
546	pTime->u8Month++;
547	Assert(pTime->u8Month >= 1 && pTime->u8Month <= 12);
548	pTime->u8MonthDay = pTime->u16YearDay - paiDayOfYear[pTime->u8Month - 1] + 1;
549	}
550	}
551
552	/*
553	* Fixup time overflows.
554	* Use unsigned int values internally to avoid overflows.
555	*/
556	uSecond = pTime->u8Second;
557	uMinute = pTime->u8Minute;
558	uHour = pTime->u8Hour;
559
560	while (pTime->u32Nanosecond >= 1000000000)
561	{
562	pTime->u32Nanosecond -= 1000000000;
563	uSecond++;
564	}
565
566	while (uSecond >= 60)
567	{
568	uSecond -= 60;
569	uMinute++;
570	}
571
572	while (uMinute >= 60)
573	{
574	uMinute -= 60;
575	uHour++;
576	}
577
578	while (uHour >= 24)
579	{
580	uHour -= 24;
581
582	/* This is really a RTTimeIncDay kind of thing... */
583	if (pTime->u16YearDay + 1 != (fLeapYear ? g_aiDayOfYearLeap[pTime->u8Month] : g_aiDayOfYear[pTime->u8Month]))
584	{
585	pTime->u16YearDay++;
586	pTime->u8MonthDay++;
587	}
588	else if (pTime->u8Month != 12)
589	{
590	pTime->u16YearDay++;
591	pTime->u8Month++;
592	pTime->u8MonthDay = 1;
593	}
594	else
595	{
596	pTime->i32Year++;
597	fLeapYear = rtTimeIsLeapYear(pTime->i32Year);
598	pTime->fFlags &= ~(RTTIME_FLAGS_COMMON_YEAR \| RTTIME_FLAGS_LEAP_YEAR);
599	pTime->u16YearDay = 1;
600	pTime->u8Month = 1;
601	pTime->u8MonthDay = 1;
602	}
603	}
604
605	pTime->u8Second = uSecond;
606	pTime->u8Minute = uMinute;
607	pTime->u8Hour = uHour;
608
609	/*
610	* Correct the leap year flag.
611	* Assert if it's wrong, but ignore if unset.
612	*/
613	if (fLeapYear)
614	{
615	Assert(!(pTime->fFlags & RTTIME_FLAGS_COMMON_YEAR));
616	pTime->fFlags &= ~RTTIME_FLAGS_COMMON_YEAR;
617	pTime->fFlags \|= RTTIME_FLAGS_LEAP_YEAR;
618	}
619	else
620	{
621	Assert(!(pTime->fFlags & RTTIME_FLAGS_LEAP_YEAR));
622	pTime->fFlags &= ~RTTIME_FLAGS_LEAP_YEAR;
623	pTime->fFlags \|= RTTIME_FLAGS_COMMON_YEAR;
624	}
625
626
627	/*
628	* Calc week day.
629	*
630	* 1970-01-01 was a Thursday (3), so find the number of days relative to
631	* that point. We use the table when possible and a slow+stupid+brute-force
632	* algorithm for points outside it. Feel free to optimize the latter by
633	* using some clever formula.
634	*/
635	if ( pTime->i32Year >= OFF_YEAR_IDX_0_YEAR
636	&& pTime->i32Year < OFF_YEAR_IDX_0_YEAR + (int32_t)RT_ELEMENTS(g_aoffYear))
637	{
638	int32_t offDays = g_aoffYear[pTime->i32Year - OFF_YEAR_IDX_0_YEAR]
639	+ pTime->u16YearDay -1;
640	pTime->u8WeekDay = ((offDays % 7) + 3 + 7) % 7;
641	}
642	else
643	{
644	int32_t i32Year = pTime->i32Year;
645	if (i32Year >= 1970)
646	{
647	uint64_t offDays = pTime->u16YearDay - 1;
648	while (--i32Year >= 1970)
649	offDays += rtTimeIsLeapYear(i32Year) ? 366 : 365;
650	pTime->u8WeekDay = (uint8_t)((offDays + 3) % 7);
651	}
652	else
653	{
654	int64_t offDays = (fLeapYear ? -366 - 1 : -365 - 1) + pTime->u16YearDay;
655	while (++i32Year < 1970)
656	offDays -= rtTimeIsLeapYear(i32Year) ? 366 : 365;
657	pTime->u8WeekDay = ((int)(offDays % 7) + 3 + 7) % 7;
658	}
659	}
660	return pTime;
661	}
662
663
664	/**
665	* Normalizes the fields of a time structure.
666	*
667	* It is possible to calculate year-day from month/day and vice
668	* versa. If you adjust any of these, make sure to zero the
669	* other so you make it clear which of the fields to use. If
670	* it's ambiguous, the year-day field is used (and you get
671	* assertions in debug builds).
672	*
673	* All the time fields and the year-day or month/day fields will
674	* be adjusted for overflows. (Since all fields are unsigned, there
675	* is no underflows.) It is possible to exploit this for simple
676	* date math, though the recommended way of doing that to implode
677	* the time into a timespec and do the math on that.
678	*
679	* @returns pTime on success.
680	* @returns NULL if the data is invalid.
681	*
682	* @param pTime The time structure to normalize.
683	*
684	* @remarks This function doesn't work with local time, only with UTC time.
685	*/
686	RTDECL(PRTTIME) RTTimeNormalize(PRTTIME pTime)
687	{
688	/*
689	* Validate that we've got the minimum of stuff handy.
690	*/
691	AssertReturn(VALID_PTR(pTime), NULL);
692	AssertMsgReturn(!(pTime->fFlags & ~RTTIME_FLAGS_MASK), ("%#x\n", pTime->fFlags), NULL);
693	AssertMsgReturn((pTime->fFlags & RTTIME_FLAGS_TYPE_MASK) != RTTIME_FLAGS_TYPE_LOCAL, ("Use RTTimeLocalNormalize!\n"), NULL);
694	AssertMsgReturn(pTime->offUTC == 0, ("%d; Use RTTimeLocalNormalize!\n", pTime->offUTC), NULL);
695
696	pTime = rtTimeNormalizeInternal(pTime);
697	if (pTime)
698	pTime->fFlags \|= RTTIME_FLAGS_TYPE_UTC;
699	return pTime;
700	}
701	RT_EXPORT_SYMBOL(RTTimeNormalize);
702
703
704	/**
705	* Normalizes the fields of a time structure, assuming local time.
706	*
707	* It is possible to calculate year-day from month/day and vice
708	* versa. If you adjust any of these, make sure to zero the
709	* other so you make it clear which of the fields to use. If
710	* it's ambiguous, the year-day field is used (and you get
711	* assertions in debug builds).
712	*
713	* All the time fields and the year-day or month/day fields will
714	* be adjusted for overflows. (Since all fields are unsigned, there
715	* is no underflows.) It is possible to exploit this for simple
716	* date math, though the recommended way of doing that to implode
717	* the time into a timespec and do the math on that.
718	*
719	* @returns pTime on success.
720	* @returns NULL if the data is invalid.
721	*
722	* @param pTime The time structure to normalize.
723	*
724	* @remarks This function doesn't work with UTC time, only with local time.
725	*/
726	RTDECL(PRTTIME) RTTimeLocalNormalize(PRTTIME pTime)
727	{
728	/*
729	* Validate that we've got the minimum of stuff handy.
730	*/
731	AssertReturn(VALID_PTR(pTime), NULL);
732	AssertMsgReturn(!(pTime->fFlags & ~RTTIME_FLAGS_MASK), ("%#x\n", pTime->fFlags), NULL);
733	AssertMsgReturn((pTime->fFlags & RTTIME_FLAGS_TYPE_MASK) != RTTIME_FLAGS_TYPE_UTC, ("Use RTTimeNormalize!\n"), NULL);
734
735	pTime = rtTimeNormalizeInternal(pTime);
736	if (pTime)
737	pTime->fFlags \|= RTTIME_FLAGS_TYPE_LOCAL;
738	return pTime;
739	}
740	RT_EXPORT_SYMBOL(RTTimeLocalNormalize);
741
742
743	/**
744	* Converts a time spec to a ISO date string.
745	*
746	* @returns psz on success.
747	* @returns NULL on buffer underflow.
748	* @param pTime The time. Caller should've normalized this.
749	* @param psz Where to store the string.
750	* @param cb The size of the buffer.
751	*/
752	RTDECL(char ) RTTimeToString(PCRTTIME pTime, char psz, size_t cb)
753	{
754	size_t cch;
755
756	/* (Default to UTC if not specified) */
757	if ( (pTime->fFlags & RTTIME_FLAGS_TYPE_MASK) == RTTIME_FLAGS_TYPE_LOCAL
758	&& pTime->offUTC)
759	{
760	int32_t offUTC = pTime->offUTC;
761	Assert(offUTC <= 840 && offUTC >= -840);
762	char chSign;
763	if (offUTC >= 0)
764	chSign = '+';
765	else
766	{
767	chSign = '-';
768	offUTC = -offUTC;
769	}
770	uint32_t offUTCHour = (uint32_t)offUTC / 60;
771	uint32_t offUTCMinute = (uint32_t)offUTC % 60;
772	cch = RTStrPrintf(psz, cb,
773	"%RI32-%02u-%02uT%02u:%02u:%02u.%09RU32%c%02d%:02d",
774	pTime->i32Year, pTime->u8Month, pTime->u8MonthDay,
775	pTime->u8Hour, pTime->u8Minute, pTime->u8Second, pTime->u32Nanosecond,
776	chSign, offUTCHour, offUTCMinute);
777	if ( cch <= 15
778	\|\| psz[cch - 6] != chSign)
779	return NULL;
780	}
781	else
782	{
783	cch = RTStrPrintf(psz, cb, "%RI32-%02u-%02uT%02u:%02u:%02u.%09RU32Z",
784	pTime->i32Year, pTime->u8Month, pTime->u8MonthDay,
785	pTime->u8Hour, pTime->u8Minute, pTime->u8Second, pTime->u32Nanosecond);
786	if ( cch <= 15
787	\|\| psz[cch - 1] != 'Z')
788	return NULL;
789	}
790	return psz;
791	}
792	RT_EXPORT_SYMBOL(RTTimeToString);
793
794
795	/**
796	* Converts a time spec to a ISO date string.
797	*
798	* @returns psz on success.
799	* @returns NULL on buffer underflow.
800	* @param pTime The time spec.
801	* @param psz Where to store the string.
802	* @param cb The size of the buffer.
803	*/
804	RTDECL(char ) RTTimeSpecToString(PCRTTIMESPEC pTime, char psz, size_t cb)
805	{
806	RTTIME Time;
807	return RTTimeToString(RTTimeExplode(&Time, pTime), psz, cb);
808	}
809	RT_EXPORT_SYMBOL(RTTimeSpecToString);
810
811
812
813	/**
814	* Attempts to convert an ISO date string to a time structure.
815	*
816	* We're a little forgiving with zero padding, unspecified parts, and leading
817	* and trailing spaces.
818	*
819	* @retval pTime on success,
820	* @retval NULL on failure.
821	* @param pTime Where to store the time on success.
822	* @param pszString The ISO date string to convert.
823	*/
824	RTDECL(PRTTIME) RTTimeFromString(PRTTIME pTime, const char *pszString)
825	{
826	/* Ignore leading spaces. */
827	while (RT_C_IS_SPACE(*pszString))
828	pszString++;
829
830	/*
831	* Init non date & time parts.
832	*/
833	pTime->fFlags = RTTIME_FLAGS_TYPE_LOCAL;
834	pTime->offUTC = 0;
835
836	/*
837	* The day part.
838	*/
839
840	/* Year */
841	int rc = RTStrToInt32Ex(pszString, (char **)&pszString, 10, &pTime->i32Year);
842	if (rc != VWRN_TRAILING_CHARS)
843	return NULL;
844
845	bool const fLeapYear = rtTimeIsLeapYear(pTime->i32Year);
846	if (fLeapYear)
847	pTime->fFlags \|= RTTIME_FLAGS_LEAP_YEAR;
848
849	if (*pszString++ != '-')
850	return NULL;
851
852	/* Month of the year. */
853	rc = RTStrToUInt8Ex(pszString, (char **)&pszString, 10, &pTime->u8Month);
854	if (rc != VWRN_TRAILING_CHARS)
855	return NULL;
856	if (pTime->u8Month == 0 \|\| pTime->u8Month > 12)
857	return NULL;
858	if (*pszString++ != '-')
859	return NULL;
860
861	/* Day of month.*/
862	rc = RTStrToUInt8Ex(pszString, (char **)&pszString, 10, &pTime->u8MonthDay);
863	if (rc != VWRN_TRAILING_CHARS && rc != VINF_SUCCESS)
864	return NULL;
865	unsigned const cDaysInMonth = fLeapYear
866	? g_acDaysInMonthsLeap[pTime->u8Month - 1]
867	: g_acDaysInMonths[pTime->u8Month - 1];
868	if (pTime->u8MonthDay == 0 \|\| pTime->u8MonthDay > cDaysInMonth)
869	return NULL;
870
871	/* Calculate year day. */
872	pTime->u16YearDay = pTime->u8MonthDay - 1
873	+ (fLeapYear
874	? g_aiDayOfYearLeap[pTime->u8Month - 1]
875	: g_aiDayOfYear[pTime->u8Month - 1]);
876
877	/*
878	* The time part.
879	*/
880	if (*pszString++ != 'T')
881	return NULL;
882
883	/* Hour. */
884	rc = RTStrToUInt8Ex(pszString, (char **)&pszString, 10, &pTime->u8Hour);
885	if (rc != VWRN_TRAILING_CHARS)
886	return NULL;
887	if (pTime->u8Hour > 23)
888	return NULL;
889	if (*pszString++ != ':')
890	return NULL;
891
892	/* Minute. */
893	rc = RTStrToUInt8Ex(pszString, (char **)&pszString, 10, &pTime->u8Minute);
894	if (rc != VWRN_TRAILING_CHARS)
895	return NULL;
896	if (pTime->u8Minute > 59)
897	return NULL;
898	if (*pszString++ != ':')
899	return NULL;
900
901	/* Second. */
902	rc = RTStrToUInt8Ex(pszString, (char **)&pszString, 10, &pTime->u8Second);
903	if (rc != VINF_SUCCESS && rc != VWRN_TRAILING_CHARS && rc != VWRN_TRAILING_SPACES)
904	return NULL;
905	if (pTime->u8Second > 59)
906	return NULL;
907
908	/* Nanoseconds is optional and probably non-standard. */
909	if (*pszString == '.')
910	{
911	rc = RTStrToUInt32Ex(pszString + 1, (char **)&pszString, 10, &pTime->u32Nanosecond);
912	if (rc != VINF_SUCCESS && rc != VWRN_TRAILING_CHARS && rc != VWRN_TRAILING_SPACES)
913	return NULL;
914	if (pTime->u32Nanosecond >= 1000000000)
915	return NULL;
916	}
917	else
918	pTime->u32Nanosecond = 0;
919
920	/*
921	* Time zone.
922	*/
923	if (*pszString == 'Z')
924	{
925	pszString++;
926	pTime->fFlags &= ~RTTIME_FLAGS_TYPE_MASK;
927	pTime->fFlags \|= ~RTTIME_FLAGS_TYPE_UTC;
928	pTime->offUTC = 0;
929	}
930	else if ( *pszString == '+'
931	\|\| *pszString == '-')
932	{
933	int8_t cUtcHours = 0;
934	rc = RTStrToInt8Ex(pszString, (char **)&pszString, 10, &cUtcHours);
935	if (rc != VINF_SUCCESS && rc != VWRN_TRAILING_CHARS && rc != VWRN_TRAILING_SPACES)
936	return NULL;
937	uint8_t cUtcMin = 0;
938	if (*pszString == ':')
939	{
940	rc = RTStrToUInt8Ex(pszString + 1, (char **)&pszString, 10, &cUtcMin);
941	if (rc != VINF_SUCCESS && rc != VWRN_TRAILING_SPACES)
942	return NULL;
943	}
944	else if (pszString && !RT_C_IS_BLANK(pszString))
945	return NULL;
946	if (cUtcHours >= 0)
947	pTime->offUTC = cUtcHours * 60 + cUtcMin;
948	else
949	pTime->offUTC = cUtcHours * 60 - cUtcMin;
950	if (RT_ABS(pTime->offUTC) > 840)
951	return NULL;
952	}
953	/* else: No time zone given, local with offUTC = 0. */
954
955	/*
956	* The rest of the string should be blanks.
957	*/
958	char ch;
959	while ((ch = *pszString++) != '\0')
960	if (!RT_C_IS_BLANK(ch))
961	return NULL;
962
963	return pTime;
964	}
965	RT_EXPORT_SYMBOL(RTTimeFromString);
966
967
968	/**
969	* Attempts to convert an ISO date string to a time structure.
970	*
971	* We're a little forgiving with zero padding, unspecified parts, and leading
972	* and trailing spaces.
973	*
974	* @retval pTime on success,
975	* @retval NULL on failure.
976	* @param pTime The time spec.
977	* @param pszString The ISO date string to convert.
978	*/
979	RTDECL(PRTTIMESPEC) RTTimeSpecFromString(PRTTIMESPEC pTime, const char *pszString)
980	{
981	RTTIME Time;
982	if (RTTimeFromString(&Time, pszString))
983	return RTTimeImplode(pTime, &Time);
984	return NULL;
985	}
986	RT_EXPORT_SYMBOL(RTTimeSpecFromString);
987
988
989	/**
990	* Adds one day to @a pTime.
991	*
992	* ASSUMES it is zulu time so DST can be ignored.
993	*/
994	static PRTTIME rtTimeAdd1Day(PRTTIME pTime)
995	{
996	Assert(!pTime->offUTC);
997	rtTimeNormalizeInternal(pTime);
998	pTime->u8MonthDay += 1;
999	pTime->u16YearDay = 0;
1000	return rtTimeNormalizeInternal(pTime);
1001	}
1002
1003
1004	/**
1005	* Subtracts one day from @a pTime.
1006	*
1007	* ASSUMES it is zulu time so DST can be ignored.
1008	*/
1009	static PRTTIME rtTimeSub1Day(PRTTIME pTime)
1010	{
1011	Assert(!pTime->offUTC);
1012	rtTimeNormalizeInternal(pTime);
1013	if (pTime->u16YearDay > 1)
1014	{
1015	pTime->u16YearDay -= 1;
1016	pTime->u8Month = 0;
1017	pTime->u8MonthDay = 0;
1018	}
1019	else
1020	{
1021	pTime->i32Year -= 1;
1022	pTime->u16YearDay = rtTimeIsLeapYear(pTime->i32Year) ? 366 : 365;
1023	pTime->u8MonthDay = 31;
1024	pTime->u8Month = 12;
1025	pTime->fFlags &= ~(RTTIME_FLAGS_COMMON_YEAR \| RTTIME_FLAGS_LEAP_YEAR);
1026	}
1027	return rtTimeNormalizeInternal(pTime);
1028	}
1029
1030
1031	/**
1032	* Adds a signed number of minutes to @a pTime.
1033	*
1034	* ASSUMES it is zulu time so DST can be ignored.
1035	*
1036	* @param pTime The time structure to work on.
1037	* @param cAddend Number of minutes to add.
1038	* ASSUMES the value isn't all that high!
1039	*/
1040	static PRTTIME rtTimeAddMinutes(PRTTIME pTime, int32_t cAddend)
1041	{
1042	Assert(RT_ABS(cAddend) < 31 * 24 * 60);
1043
1044	/*
1045	* Work on minutes of the day.
1046	*/
1047	int32_t const cMinutesInDay = 24 * 60;
1048	int32_t iDayMinute = (unsigned)pTime->u8Hour * 60 + pTime->u8Minute;
1049	iDayMinute += cAddend;
1050
1051	while (iDayMinute >= cMinutesInDay)
1052	{
1053	rtTimeAdd1Day(pTime);
1054	iDayMinute -= cMinutesInDay;
1055	}
1056
1057	while (iDayMinute < 0)
1058	{
1059	rtTimeSub1Day(pTime);
1060	iDayMinute += cMinutesInDay;
1061	}
1062
1063	pTime->u8Hour = iDayMinute / 60;
1064	pTime->u8Minute = iDayMinute % 60;
1065
1066	return pTime;
1067	}
1068
1069
1070	/**
1071	* Converts @a pTime to zulu time (UTC) if needed.
1072	*
1073	* @returns pTime.
1074	* @param pTime What to convert (in/out).
1075	*/
1076	static PRTTIME rtTimeConvertToZulu(PRTTIME pTime)
1077	{
1078	RTTIME_ASSERT_NORMALIZED(pTime);
1079	if ((pTime->fFlags & RTTIME_FLAGS_TYPE_MASK) != RTTIME_FLAGS_TYPE_UTC)
1080	{
1081	int32_t offUTC = pTime->offUTC;
1082	pTime->offUTC = 0;
1083	pTime->fFlags &= ~RTTIME_FLAGS_TYPE_MASK;
1084	pTime->fFlags \|= RTTIME_FLAGS_TYPE_UTC;
1085	if (offUTC != 0)
1086	rtTimeAddMinutes(pTime, -offUTC);
1087	}
1088	return pTime;
1089	}
1090
1091
1092	/**
1093	* Converts a time structure to UTC, relying on UTC offset information if it contains local time.
1094	*
1095	* @returns pTime on success.
1096	* @returns NULL if the data is invalid.
1097	* @param pTime The time structure to convert.
1098	*/
1099	RTDECL(PRTTIME) RTTimeConvertToZulu(PRTTIME pTime)
1100	{
1101	/*
1102	* Validate that we've got the minimum of stuff handy.
1103	*/
1104	AssertReturn(VALID_PTR(pTime), NULL);
1105	AssertMsgReturn(!(pTime->fFlags & ~RTTIME_FLAGS_MASK), ("%#x\n", pTime->fFlags), NULL);
1106
1107	return rtTimeConvertToZulu(rtTimeNormalizeInternal(pTime));
1108	}
1109	RT_EXPORT_SYMBOL(RTTimeConvertToZulu);
1110
1111
1112	/**
1113	* Compares two normalized time structures.
1114	*
1115	* @retval 0 if equal.
1116	* @retval -1 if @a pLeft is earlier than @a pRight.
1117	* @retval 1 if @a pRight is earlier than @a pLeft.
1118	*
1119	* @param pLeft The left side time. NULL is accepted.
1120	* @param pRight The right side time. NULL is accepted.
1121	*
1122	* @note A NULL time is considered smaller than anything else. If both are
1123	* NULL, they are considered equal.
1124	*/
1125	RTDECL(int) RTTimeCompare(PCRTTIME pLeft, PCRTTIME pRight)
1126	{
1127	#ifdef RT_STRICT
1128	if (pLeft)
1129	RTTIME_ASSERT_NORMALIZED(pLeft);
1130	if (pRight)
1131	RTTIME_ASSERT_NORMALIZED(pRight);
1132	#endif
1133
1134	int iRet;
1135	if (pLeft)
1136	{
1137	if (pRight)
1138	{
1139	/*
1140	* Only work with normalized zulu time.
1141	*/
1142	RTTIME TmpLeft;
1143	if ( pLeft->offUTC != 0
1144	\|\| pLeft->u16YearDay == 0
1145	\|\| pLeft->u16YearDay > 366
1146	\|\| pLeft->u8Hour >= 60
1147	\|\| pLeft->u8Minute >= 60
1148	\|\| pLeft->u8Second >= 60)
1149	{
1150	TmpLeft = *pLeft;
1151	pLeft = rtTimeConvertToZulu(rtTimeNormalizeInternal(&TmpLeft));
1152	}
1153
1154	RTTIME TmpRight;
1155	if ( pRight->offUTC != 0
1156	\|\| pRight->u16YearDay == 0
1157	\|\| pRight->u16YearDay > 366
1158	\|\| pRight->u8Hour >= 60
1159	\|\| pRight->u8Minute >= 60
1160	\|\| pRight->u8Second >= 60)
1161	{
1162	TmpRight = *pRight;
1163	pRight = rtTimeConvertToZulu(rtTimeNormalizeInternal(&TmpRight));
1164	}
1165
1166	/*
1167	* Do the comparison.
1168	*/
1169	if ( pLeft->i32Year != pRight->i32Year)
1170	iRet = pLeft->i32Year < pRight->i32Year ? -1 : 1;
1171	else if ( pLeft->u16YearDay != pRight->u16YearDay)
1172	iRet = pLeft->u16YearDay < pRight->u16YearDay ? -1 : 1;
1173	else if ( pLeft->u8Hour != pRight->u8Hour)
1174	iRet = pLeft->u8Hour < pRight->u8Hour ? -1 : 1;
1175	else if ( pLeft->u8Minute != pRight->u8Minute)
1176	iRet = pLeft->u8Minute < pRight->u8Minute ? -1 : 1;
1177	else if ( pLeft->u8Second != pRight->u8Second)
1178	iRet = pLeft->u8Second < pRight->u8Second ? -1 : 1;
1179	else if ( pLeft->u32Nanosecond != pRight->u32Nanosecond)
1180	iRet = pLeft->u32Nanosecond < pRight->u32Nanosecond ? -1 : 1;
1181	else
1182	iRet = 0;
1183	}
1184	else
1185	iRet = 1;
1186	}
1187	else
1188	iRet = pRight ? -1 : 0;
1189	return iRet;
1190	}
1191	RT_EXPORT_SYMBOL(RTTimeCompare);
1192

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source: vbox/trunk/src/VBox/Runtime/common/time/time.cpp@ 72164

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