time.cpp@ 72150

Last change on this file since 72150 was 72150, checked in by vboxsync, 7 years ago
IPRT/time: fix condition for converting time to UTC in RTTimeImplode
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 72150 2018-05-07 15:57:55Z 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.virtualbox.org. 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
419	RTTIME TimeUTC;
420	if ((pTime->fFlags & RTTIME_FLAGS_TYPE_MASK) == RTTIME_FLAGS_TYPE_LOCAL)
421	{
422	TimeUTC = *pTime;
423	pTime = rtTimeConvertToZulu(&TimeUTC);
424	}
425
426	/*
427	* Do the conversion to nanoseconds.
428	*/
429	i32Days = g_aoffYear[pTime->i32Year - OFF_YEAR_IDX_0_YEAR]
430	+ pTime->u16YearDay - 1;
431	AssertMsgReturn(i32Days <= RTTIME_MAX_DAY && i32Days >= RTTIME_MIN_DAY, ("%RI32\n", i32Days), NULL);
432
433	u32Secs = pTime->u8Second
434	+ pTime->u8Minute * 60
435	+ pTime->u8Hour * 3600;
436	i64Nanos = (uint64_t)pTime->u32Nanosecond
437	+ u32Secs * UINT64_C(1000000000);
438	AssertMsgReturn(i32Days != RTTIME_MAX_DAY \|\| i64Nanos <= RTTIME_MAX_DAY_NANO, ("%RI64\n", i64Nanos), NULL);
439	AssertMsgReturn(i32Days != RTTIME_MIN_DAY \|\| i64Nanos >= RTTIME_MIN_DAY_NANO, ("%RI64\n", i64Nanos), NULL);
440
441	i64Nanos += i32Days * UINT64_C(86400000000000);
442
443	pTimeSpec->i64NanosecondsRelativeToUnixEpoch = i64Nanos;
444	return pTimeSpec;
445	}
446	RT_EXPORT_SYMBOL(RTTimeImplode);
447
448
449	/**
450	* Internal worker for RTTimeNormalize and RTTimeLocalNormalize.
451	*/
452	static PRTTIME rtTimeNormalizeInternal(PRTTIME pTime)
453	{
454	unsigned uSecond;
455	unsigned uMinute;
456	unsigned uHour;
457	bool fLeapYear;
458
459	/*
460	* Fix the YearDay and Month/MonthDay.
461	*/
462	fLeapYear = rtTimeIsLeapYear(pTime->i32Year);
463	if (!pTime->u16YearDay)
464	{
465	/*
466	* The Month+MonthDay must present, overflow adjust them and calc the year day.
467	*/
468	AssertMsgReturn( pTime->u8Month
469	&& pTime->u8MonthDay,
470	("date=%d-%d-%d\n", pTime->i32Year, pTime->u8Month, pTime->u8MonthDay),
471	NULL);
472	while (pTime->u8Month > 12)
473	{
474	pTime->u8Month -= 12;
475	pTime->i32Year++;
476	fLeapYear = rtTimeIsLeapYear(pTime->i32Year);
477	pTime->fFlags &= ~(RTTIME_FLAGS_COMMON_YEAR \| RTTIME_FLAGS_LEAP_YEAR);
478	}
479
480	for (;;)
481	{
482	unsigned cDaysInMonth = fLeapYear
483	? g_acDaysInMonthsLeap[pTime->u8Month - 1]
484	: g_acDaysInMonths[pTime->u8Month - 1];
485	if (pTime->u8MonthDay <= cDaysInMonth)
486	break;
487	pTime->u8MonthDay -= cDaysInMonth;
488	if (pTime->u8Month != 12)
489	pTime->u8Month++;
490	else
491	{
492	pTime->u8Month = 1;
493	pTime->i32Year++;
494	fLeapYear = rtTimeIsLeapYear(pTime->i32Year);
495	pTime->fFlags &= ~(RTTIME_FLAGS_COMMON_YEAR \| RTTIME_FLAGS_LEAP_YEAR);
496	}
497	}
498
499	pTime->u16YearDay = pTime->u8MonthDay - 1
500	+ (fLeapYear
501	? g_aiDayOfYearLeap[pTime->u8Month - 1]
502	: g_aiDayOfYear[pTime->u8Month - 1]);
503	}
504	else
505	{
506	/*
507	* Are both YearDay and Month/MonthDay valid?
508	* Check that they don't overflow and match, if not use YearDay (simpler).
509	*/
510	bool fRecalc = true;
511	if ( pTime->u8Month
512	&& pTime->u8MonthDay)
513	{
514	do
515	{
516	uint16_t u16YearDay;
517
518	/* If you change one, zero the other to make clear what you mean. */
519	AssertBreak(pTime->u8Month <= 12);
520	AssertBreak(pTime->u8MonthDay <= (fLeapYear
521	? g_acDaysInMonthsLeap[pTime->u8Month - 1]
522	: g_acDaysInMonths[pTime->u8Month - 1]));
523	u16YearDay = pTime->u8MonthDay - 1
524	+ (fLeapYear
525	? g_aiDayOfYearLeap[pTime->u8Month - 1]
526	: g_aiDayOfYear[pTime->u8Month - 1]);
527	AssertBreak(u16YearDay == pTime->u16YearDay);
528	fRecalc = false;
529	} while (0);
530	}
531	if (fRecalc)
532	{
533	const uint16_t *paiDayOfYear;
534
535	/* overflow adjust YearDay */
536	while (pTime->u16YearDay > (fLeapYear ? 366 : 365))
537	{
538	pTime->u16YearDay -= fLeapYear ? 366 : 365;
539	pTime->i32Year++;
540	fLeapYear = rtTimeIsLeapYear(pTime->i32Year);
541	pTime->fFlags &= ~(RTTIME_FLAGS_COMMON_YEAR \| RTTIME_FLAGS_LEAP_YEAR);
542	}
543
544	/* calc Month and MonthDay */
545	paiDayOfYear = fLeapYear
546	? &g_aiDayOfYearLeap[0]
547	: &g_aiDayOfYear[0];
548	pTime->u8Month = 1;
549	while (pTime->u16YearDay >= paiDayOfYear[pTime->u8Month])
550	pTime->u8Month++;
551	Assert(pTime->u8Month >= 1 && pTime->u8Month <= 12);
552	pTime->u8MonthDay = pTime->u16YearDay - paiDayOfYear[pTime->u8Month - 1] + 1;
553	}
554	}
555
556	/*
557	* Fixup time overflows.
558	* Use unsigned int values internally to avoid overflows.
559	*/
560	uSecond = pTime->u8Second;
561	uMinute = pTime->u8Minute;
562	uHour = pTime->u8Hour;
563
564	while (pTime->u32Nanosecond >= 1000000000)
565	{
566	pTime->u32Nanosecond -= 1000000000;
567	uSecond++;
568	}
569
570	while (uSecond >= 60)
571	{
572	uSecond -= 60;
573	uMinute++;
574	}
575
576	while (uMinute >= 60)
577	{
578	uMinute -= 60;
579	uHour++;
580	}
581
582	while (uHour >= 24)
583	{
584	uHour -= 24;
585
586	/* This is really a RTTimeIncDay kind of thing... */
587	if (pTime->u16YearDay + 1 != (fLeapYear ? g_aiDayOfYearLeap[pTime->u8Month] : g_aiDayOfYear[pTime->u8Month]))
588	{
589	pTime->u16YearDay++;
590	pTime->u8MonthDay++;
591	}
592	else if (pTime->u8Month != 12)
593	{
594	pTime->u16YearDay++;
595	pTime->u8Month++;
596	pTime->u8MonthDay = 1;
597	}
598	else
599	{
600	pTime->i32Year++;
601	fLeapYear = rtTimeIsLeapYear(pTime->i32Year);
602	pTime->fFlags &= ~(RTTIME_FLAGS_COMMON_YEAR \| RTTIME_FLAGS_LEAP_YEAR);
603	pTime->u16YearDay = 1;
604	pTime->u8Month = 1;
605	pTime->u8MonthDay = 1;
606	}
607	}
608
609	pTime->u8Second = uSecond;
610	pTime->u8Minute = uMinute;
611	pTime->u8Hour = uHour;
612
613	/*
614	* Correct the leap year flag.
615	* Assert if it's wrong, but ignore if unset.
616	*/
617	if (fLeapYear)
618	{
619	Assert(!(pTime->fFlags & RTTIME_FLAGS_COMMON_YEAR));
620	pTime->fFlags &= ~RTTIME_FLAGS_COMMON_YEAR;
621	pTime->fFlags \|= RTTIME_FLAGS_LEAP_YEAR;
622	}
623	else
624	{
625	Assert(!(pTime->fFlags & RTTIME_FLAGS_LEAP_YEAR));
626	pTime->fFlags &= ~RTTIME_FLAGS_LEAP_YEAR;
627	pTime->fFlags \|= RTTIME_FLAGS_COMMON_YEAR;
628	}
629
630
631	/*
632	* Calc week day.
633	*
634	* 1970-01-01 was a Thursday (3), so find the number of days relative to
635	* that point. We use the table when possible and a slow+stupid+brute-force
636	* algorithm for points outside it. Feel free to optimize the latter by
637	* using some clever formula.
638	*/
639	if ( pTime->i32Year >= OFF_YEAR_IDX_0_YEAR
640	&& pTime->i32Year < OFF_YEAR_IDX_0_YEAR + (int32_t)RT_ELEMENTS(g_aoffYear))
641	{
642	int32_t offDays = g_aoffYear[pTime->i32Year - OFF_YEAR_IDX_0_YEAR]
643	+ pTime->u16YearDay -1;
644	pTime->u8WeekDay = ((offDays % 7) + 3 + 7) % 7;
645	}
646	else
647	{
648	int32_t i32Year = pTime->i32Year;
649	if (i32Year >= 1970)
650	{
651	uint64_t offDays = pTime->u16YearDay - 1;
652	while (--i32Year >= 1970)
653	offDays += rtTimeIsLeapYear(i32Year) ? 366 : 365;
654	pTime->u8WeekDay = (uint8_t)((offDays + 3) % 7);
655	}
656	else
657	{
658	int64_t offDays = (fLeapYear ? -366 - 1 : -365 - 1) + pTime->u16YearDay;
659	while (++i32Year < 1970)
660	offDays -= rtTimeIsLeapYear(i32Year) ? 366 : 365;
661	pTime->u8WeekDay = ((int)(offDays % 7) + 3 + 7) % 7;
662	}
663	}
664	return pTime;
665	}
666
667
668	/**
669	* Normalizes the fields of a time structure.
670	*
671	* It is possible to calculate year-day from month/day and vice
672	* versa. If you adjust any of these, make sure to zero the
673	* other so you make it clear which of the fields to use. If
674	* it's ambiguous, the year-day field is used (and you get
675	* assertions in debug builds).
676	*
677	* All the time fields and the year-day or month/day fields will
678	* be adjusted for overflows. (Since all fields are unsigned, there
679	* is no underflows.) It is possible to exploit this for simple
680	* date math, though the recommended way of doing that to implode
681	* the time into a timespec and do the math on that.
682	*
683	* @returns pTime on success.
684	* @returns NULL if the data is invalid.
685	*
686	* @param pTime The time structure to normalize.
687	*
688	* @remarks This function doesn't work with local time, only with UTC time.
689	*/
690	RTDECL(PRTTIME) RTTimeNormalize(PRTTIME pTime)
691	{
692	/*
693	* Validate that we've got the minimum of stuff handy.
694	*/
695	AssertReturn(VALID_PTR(pTime), NULL);
696	AssertMsgReturn(!(pTime->fFlags & ~RTTIME_FLAGS_MASK), ("%#x\n", pTime->fFlags), NULL);
697	AssertMsgReturn((pTime->fFlags & RTTIME_FLAGS_TYPE_MASK) != RTTIME_FLAGS_TYPE_LOCAL, ("Use RTTimeLocalNormalize!\n"), NULL);
698	AssertMsgReturn(pTime->offUTC == 0, ("%d; Use RTTimeLocalNormalize!\n", pTime->offUTC), NULL);
699
700	pTime = rtTimeNormalizeInternal(pTime);
701	if (pTime)
702	pTime->fFlags \|= RTTIME_FLAGS_TYPE_UTC;
703	return pTime;
704	}
705	RT_EXPORT_SYMBOL(RTTimeNormalize);
706
707
708	/**
709	* Normalizes the fields of a time structure, assuming local time.
710	*
711	* It is possible to calculate year-day from month/day and vice
712	* versa. If you adjust any of these, make sure to zero the
713	* other so you make it clear which of the fields to use. If
714	* it's ambiguous, the year-day field is used (and you get
715	* assertions in debug builds).
716	*
717	* All the time fields and the year-day or month/day fields will
718	* be adjusted for overflows. (Since all fields are unsigned, there
719	* is no underflows.) It is possible to exploit this for simple
720	* date math, though the recommended way of doing that to implode
721	* the time into a timespec and do the math on that.
722	*
723	* @returns pTime on success.
724	* @returns NULL if the data is invalid.
725	*
726	* @param pTime The time structure to normalize.
727	*
728	* @remarks This function doesn't work with UTC time, only with local time.
729	*/
730	RTDECL(PRTTIME) RTTimeLocalNormalize(PRTTIME pTime)
731	{
732	/*
733	* Validate that we've got the minimum of stuff handy.
734	*/
735	AssertReturn(VALID_PTR(pTime), NULL);
736	AssertMsgReturn(!(pTime->fFlags & ~RTTIME_FLAGS_MASK), ("%#x\n", pTime->fFlags), NULL);
737	AssertMsgReturn((pTime->fFlags & RTTIME_FLAGS_TYPE_MASK) != RTTIME_FLAGS_TYPE_UTC, ("Use RTTimeNormalize!\n"), NULL);
738
739	pTime = rtTimeNormalizeInternal(pTime);
740	if (pTime)
741	pTime->fFlags \|= RTTIME_FLAGS_TYPE_LOCAL;
742	return pTime;
743	}
744	RT_EXPORT_SYMBOL(RTTimeLocalNormalize);
745
746
747	/**
748	* Converts a time spec to a ISO date string.
749	*
750	* @returns psz on success.
751	* @returns NULL on buffer underflow.
752	* @param pTime The time. Caller should've normalized this.
753	* @param psz Where to store the string.
754	* @param cb The size of the buffer.
755	*/
756	RTDECL(char ) RTTimeToString(PCRTTIME pTime, char psz, size_t cb)
757	{
758	size_t cch;
759
760	/* (Default to UTC if not specified) */
761	if ( (pTime->fFlags & RTTIME_FLAGS_TYPE_MASK) == RTTIME_FLAGS_TYPE_LOCAL
762	&& pTime->offUTC)
763	{
764	int32_t offUTC = pTime->offUTC;
765	Assert(offUTC <= 840 && offUTC >= -840);
766	char chSign;
767	if (offUTC >= 0)
768	chSign = '+';
769	else
770	{
771	chSign = '-';
772	offUTC = -offUTC;
773	}
774	uint32_t offUTCHour = (uint32_t)offUTC / 60;
775	uint32_t offUTCMinute = (uint32_t)offUTC % 60;
776	cch = RTStrPrintf(psz, cb,
777	"%RI32-%02u-%02uT%02u:%02u:%02u.%09RU32%c%02d%:02d",
778	pTime->i32Year, pTime->u8Month, pTime->u8MonthDay,
779	pTime->u8Hour, pTime->u8Minute, pTime->u8Second, pTime->u32Nanosecond,
780	chSign, offUTCHour, offUTCMinute);
781	if ( cch <= 15
782	\|\| psz[cch - 6] != chSign)
783	return NULL;
784	}
785	else
786	{
787	cch = RTStrPrintf(psz, cb, "%RI32-%02u-%02uT%02u:%02u:%02u.%09RU32Z",
788	pTime->i32Year, pTime->u8Month, pTime->u8MonthDay,
789	pTime->u8Hour, pTime->u8Minute, pTime->u8Second, pTime->u32Nanosecond);
790	if ( cch <= 15
791	\|\| psz[cch - 1] != 'Z')
792	return NULL;
793	}
794	return psz;
795	}
796	RT_EXPORT_SYMBOL(RTTimeToString);
797
798
799	/**
800	* Converts a time spec to a ISO date string.
801	*
802	* @returns psz on success.
803	* @returns NULL on buffer underflow.
804	* @param pTime The time spec.
805	* @param psz Where to store the string.
806	* @param cb The size of the buffer.
807	*/
808	RTDECL(char ) RTTimeSpecToString(PCRTTIMESPEC pTime, char psz, size_t cb)
809	{
810	RTTIME Time;
811	return RTTimeToString(RTTimeExplode(&Time, pTime), psz, cb);
812	}
813	RT_EXPORT_SYMBOL(RTTimeSpecToString);
814
815
816
817	/**
818	* Attempts to convert an ISO date string to a time structure.
819	*
820	* We're a little forgiving with zero padding, unspecified parts, and leading
821	* and trailing spaces.
822	*
823	* @retval pTime on success,
824	* @retval NULL on failure.
825	* @param pTime Where to store the time on success.
826	* @param pszString The ISO date string to convert.
827	*/
828	RTDECL(PRTTIME) RTTimeFromString(PRTTIME pTime, const char *pszString)
829	{
830	/* Ignore leading spaces. */
831	while (RT_C_IS_SPACE(*pszString))
832	pszString++;
833
834	/*
835	* Init non date & time parts.
836	*/
837	pTime->fFlags = RTTIME_FLAGS_TYPE_LOCAL;
838	pTime->offUTC = 0;
839
840	/*
841	* The day part.
842	*/
843
844	/* Year */
845	int rc = RTStrToInt32Ex(pszString, (char **)&pszString, 10, &pTime->i32Year);
846	if (rc != VWRN_TRAILING_CHARS)
847	return NULL;
848
849	bool const fLeapYear = rtTimeIsLeapYear(pTime->i32Year);
850	if (fLeapYear)
851	pTime->fFlags \|= RTTIME_FLAGS_LEAP_YEAR;
852
853	if (*pszString++ != '-')
854	return NULL;
855
856	/* Month of the year. */
857	rc = RTStrToUInt8Ex(pszString, (char **)&pszString, 10, &pTime->u8Month);
858	if (rc != VWRN_TRAILING_CHARS)
859	return NULL;
860	if (pTime->u8Month == 0 \|\| pTime->u8Month > 12)
861	return NULL;
862	if (*pszString++ != '-')
863	return NULL;
864
865	/* Day of month.*/
866	rc = RTStrToUInt8Ex(pszString, (char **)&pszString, 10, &pTime->u8MonthDay);
867	if (rc != VWRN_TRAILING_CHARS && rc != VINF_SUCCESS)
868	return NULL;
869	unsigned const cDaysInMonth = fLeapYear
870	? g_acDaysInMonthsLeap[pTime->u8Month - 1]
871	: g_acDaysInMonths[pTime->u8Month - 1];
872	if (pTime->u8MonthDay == 0 \|\| pTime->u8MonthDay > cDaysInMonth)
873	return NULL;
874
875	/* Calculate year day. */
876	pTime->u16YearDay = pTime->u8MonthDay - 1
877	+ (fLeapYear
878	? g_aiDayOfYearLeap[pTime->u8Month - 1]
879	: g_aiDayOfYear[pTime->u8Month - 1]);
880
881	/*
882	* The time part.
883	*/
884	if (*pszString++ != 'T')
885	return NULL;
886
887	/* Hour. */
888	rc = RTStrToUInt8Ex(pszString, (char **)&pszString, 10, &pTime->u8Hour);
889	if (rc != VWRN_TRAILING_CHARS)
890	return NULL;
891	if (pTime->u8Hour > 23)
892	return NULL;
893	if (*pszString++ != ':')
894	return NULL;
895
896	/* Minute. */
897	rc = RTStrToUInt8Ex(pszString, (char **)&pszString, 10, &pTime->u8Minute);
898	if (rc != VWRN_TRAILING_CHARS)
899	return NULL;
900	if (pTime->u8Minute > 59)
901	return NULL;
902	if (*pszString++ != ':')
903	return NULL;
904
905	/* Second. */
906	rc = RTStrToUInt8Ex(pszString, (char **)&pszString, 10, &pTime->u8Second);
907	if (rc != VINF_SUCCESS && rc != VWRN_TRAILING_CHARS && rc != VWRN_TRAILING_SPACES)
908	return NULL;
909	if (pTime->u8Second > 59)
910	return NULL;
911
912	/* Nanoseconds is optional and probably non-standard. */
913	if (*pszString == '.')
914	{
915	rc = RTStrToUInt32Ex(pszString + 1, (char **)&pszString, 10, &pTime->u32Nanosecond);
916	if (rc != VINF_SUCCESS && rc != VWRN_TRAILING_CHARS && rc != VWRN_TRAILING_SPACES)
917	return NULL;
918	if (pTime->u32Nanosecond >= 1000000000)
919	return NULL;
920	}
921	else
922	pTime->u32Nanosecond = 0;
923
924	/*
925	* Time zone.
926	*/
927	if (*pszString == 'Z')
928	{
929	pszString++;
930	pTime->fFlags &= ~RTTIME_FLAGS_TYPE_MASK;
931	pTime->fFlags \|= ~RTTIME_FLAGS_TYPE_UTC;
932	pTime->offUTC = 0;
933	}
934	else if ( *pszString == '+'
935	\|\| *pszString == '-')
936	{
937	int8_t cUtcHours = 0;
938	rc = RTStrToInt8Ex(pszString, (char **)&pszString, 10, &cUtcHours);
939	if (rc != VINF_SUCCESS && rc != VWRN_TRAILING_CHARS && rc != VWRN_TRAILING_SPACES)
940	return NULL;
941	uint8_t cUtcMin = 0;
942	if (*pszString == ':')
943	{
944	rc = RTStrToUInt8Ex(pszString + 1, (char **)&pszString, 10, &cUtcMin);
945	if (rc != VINF_SUCCESS && rc != VWRN_TRAILING_SPACES)
946	return NULL;
947	}
948	else if (pszString && !RT_C_IS_BLANK(pszString))
949	return NULL;
950	if (cUtcHours >= 0)
951	pTime->offUTC = cUtcHours * 60 + cUtcMin;
952	else
953	pTime->offUTC = cUtcHours * 60 - cUtcMin;
954	if (RT_ABS(pTime->offUTC) > 840)
955	return NULL;
956	}
957	/* else: No time zone given, local with offUTC = 0. */
958
959	/*
960	* The rest of the string should be blanks.
961	*/
962	char ch;
963	while ((ch = *pszString++) != '\0')
964	if (!RT_C_IS_BLANK(ch))
965	return NULL;
966
967	return pTime;
968	}
969	RT_EXPORT_SYMBOL(RTTimeFromString);
970
971
972	/**
973	* Attempts to convert an ISO date string to a time structure.
974	*
975	* We're a little forgiving with zero padding, unspecified parts, and leading
976	* and trailing spaces.
977	*
978	* @retval pTime on success,
979	* @retval NULL on failure.
980	* @param pTime The time spec.
981	* @param pszString The ISO date string to convert.
982	*/
983	RTDECL(PRTTIMESPEC) RTTimeSpecFromString(PRTTIMESPEC pTime, const char *pszString)
984	{
985	RTTIME Time;
986	if (RTTimeFromString(&Time, pszString))
987	return RTTimeImplode(pTime, &Time);
988	return NULL;
989	}
990	RT_EXPORT_SYMBOL(RTTimeSpecFromString);
991
992
993	/**
994	* Adds one day to @a pTime.
995	*
996	* ASSUMES it is zulu time so DST can be ignored.
997	*/
998	static PRTTIME rtTimeAdd1Day(PRTTIME pTime)
999	{
1000	Assert(!pTime->offUTC);
1001	rtTimeNormalizeInternal(pTime);
1002	pTime->u8MonthDay += 1;
1003	pTime->u16YearDay = 0;
1004	return rtTimeNormalizeInternal(pTime);
1005	}
1006
1007
1008	/**
1009	* Subtracts one day from @a pTime.
1010	*
1011	* ASSUMES it is zulu time so DST can be ignored.
1012	*/
1013	static PRTTIME rtTimeSub1Day(PRTTIME pTime)
1014	{
1015	Assert(!pTime->offUTC);
1016	rtTimeNormalizeInternal(pTime);
1017	if (pTime->u16YearDay > 1)
1018	{
1019	pTime->u16YearDay -= 1;
1020	pTime->u8Month = 0;
1021	pTime->u8MonthDay = 0;
1022	}
1023	else
1024	{
1025	pTime->i32Year -= 1;
1026	pTime->u16YearDay = rtTimeIsLeapYear(pTime->i32Year) ? 366 : 365;
1027	pTime->u8MonthDay = 31;
1028	pTime->u8Month = 12;
1029	pTime->fFlags &= ~(RTTIME_FLAGS_COMMON_YEAR \| RTTIME_FLAGS_LEAP_YEAR);
1030	}
1031	return rtTimeNormalizeInternal(pTime);
1032	}
1033
1034
1035	/**
1036	* Adds a signed number of minutes to @a pTime.
1037	*
1038	* ASSUMES it is zulu time so DST can be ignored.
1039	*
1040	* @param pTime The time structure to work on.
1041	* @param cAddend Number of minutes to add.
1042	* ASSUMES the value isn't all that high!
1043	*/
1044	static PRTTIME rtTimeAddMinutes(PRTTIME pTime, int32_t cAddend)
1045	{
1046	Assert(RT_ABS(cAddend) < 31 * 24 * 60);
1047
1048	/*
1049	* Work on minutes of the day.
1050	*/
1051	int32_t const cMinutesInDay = 24 * 60;
1052	int32_t iDayMinute = (unsigned)pTime->u8Hour * 60 + pTime->u8Minute;
1053	iDayMinute += cAddend;
1054
1055	while (iDayMinute >= cMinutesInDay)
1056	{
1057	rtTimeAdd1Day(pTime);
1058	iDayMinute -= cMinutesInDay;
1059	}
1060
1061	while (iDayMinute < 0)
1062	{
1063	rtTimeSub1Day(pTime);
1064	iDayMinute += cMinutesInDay;
1065	}
1066
1067	pTime->u8Hour = iDayMinute / 60;
1068	pTime->u8Minute = iDayMinute % 60;
1069
1070	return pTime;
1071	}
1072
1073
1074	/**
1075	* Converts @a pTime to zulu time (UTC) if needed.
1076	*
1077	* @returns pTime.
1078	* @param pTime What to convert (in/out).
1079	*/
1080	static PRTTIME rtTimeConvertToZulu(PRTTIME pTime)
1081	{
1082	RTTIME_ASSERT_NORMALIZED(pTime);
1083	if ((pTime->fFlags & RTTIME_FLAGS_TYPE_MASK) != RTTIME_FLAGS_TYPE_UTC)
1084	{
1085	int32_t offUTC = pTime->offUTC;
1086	pTime->offUTC = 0;
1087	pTime->fFlags &= ~RTTIME_FLAGS_TYPE_MASK;
1088	pTime->fFlags \|= RTTIME_FLAGS_TYPE_UTC;
1089	if (offUTC != 0)
1090	rtTimeAddMinutes(pTime, -offUTC);
1091	}
1092	return pTime;
1093	}
1094
1095
1096	/**
1097	* Converts a time structure to UTC, relying on UTC offset information if it contains local time.
1098	*
1099	* @returns pTime on success.
1100	* @returns NULL if the data is invalid.
1101	* @param pTime The time structure to convert.
1102	*/
1103	RTDECL(PRTTIME) RTTimeConvertToZulu(PRTTIME pTime)
1104	{
1105	/*
1106	* Validate that we've got the minimum of stuff handy.
1107	*/
1108	AssertReturn(VALID_PTR(pTime), NULL);
1109	AssertMsgReturn(!(pTime->fFlags & ~RTTIME_FLAGS_MASK), ("%#x\n", pTime->fFlags), NULL);
1110
1111	return rtTimeConvertToZulu(rtTimeNormalizeInternal(pTime));
1112	}
1113	RT_EXPORT_SYMBOL(RTTimeConvertToZulu);
1114
1115
1116	/**
1117	* Compares two normalized time structures.
1118	*
1119	* @retval 0 if equal.
1120	* @retval -1 if @a pLeft is earlier than @a pRight.
1121	* @retval 1 if @a pRight is earlier than @a pLeft.
1122	*
1123	* @param pLeft The left side time. NULL is accepted.
1124	* @param pRight The right side time. NULL is accepted.
1125	*
1126	* @note A NULL time is considered smaller than anything else. If both are
1127	* NULL, they are considered equal.
1128	*/
1129	RTDECL(int) RTTimeCompare(PCRTTIME pLeft, PCRTTIME pRight)
1130	{
1131	#ifdef RT_STRICT
1132	if (pLeft)
1133	RTTIME_ASSERT_NORMALIZED(pLeft);
1134	if (pRight)
1135	RTTIME_ASSERT_NORMALIZED(pRight);
1136	#endif
1137
1138	int iRet;
1139	if (pLeft)
1140	{
1141	if (pRight)
1142	{
1143	/*
1144	* Only work with normalized zulu time.
1145	*/
1146	RTTIME TmpLeft;
1147	if ( pLeft->offUTC != 0
1148	\|\| pLeft->u16YearDay == 0
1149	\|\| pLeft->u16YearDay > 366
1150	\|\| pLeft->u8Hour >= 60
1151	\|\| pLeft->u8Minute >= 60
1152	\|\| pLeft->u8Second >= 60)
1153	{
1154	TmpLeft = *pLeft;
1155	pLeft = rtTimeConvertToZulu(rtTimeNormalizeInternal(&TmpLeft));
1156	}
1157
1158	RTTIME TmpRight;
1159	if ( pRight->offUTC != 0
1160	\|\| pRight->u16YearDay == 0
1161	\|\| pRight->u16YearDay > 366
1162	\|\| pRight->u8Hour >= 60
1163	\|\| pRight->u8Minute >= 60
1164	\|\| pRight->u8Second >= 60)
1165	{
1166	TmpRight = *pRight;
1167	pRight = rtTimeConvertToZulu(rtTimeNormalizeInternal(&TmpRight));
1168	}
1169
1170	/*
1171	* Do the comparison.
1172	*/
1173	if ( pLeft->i32Year != pRight->i32Year)
1174	iRet = pLeft->i32Year < pRight->i32Year ? -1 : 1;
1175	else if ( pLeft->u16YearDay != pRight->u16YearDay)
1176	iRet = pLeft->u16YearDay < pRight->u16YearDay ? -1 : 1;
1177	else if ( pLeft->u8Hour != pRight->u8Hour)
1178	iRet = pLeft->u8Hour < pRight->u8Hour ? -1 : 1;
1179	else if ( pLeft->u8Minute != pRight->u8Minute)
1180	iRet = pLeft->u8Minute < pRight->u8Minute ? -1 : 1;
1181	else if ( pLeft->u8Second != pRight->u8Second)
1182	iRet = pLeft->u8Second < pRight->u8Second ? -1 : 1;
1183	else if ( pLeft->u32Nanosecond != pRight->u32Nanosecond)
1184	iRet = pLeft->u32Nanosecond < pRight->u32Nanosecond ? -1 : 1;
1185	else
1186	iRet = 0;
1187	}
1188	else
1189	iRet = 1;
1190	}
1191	else
1192	iRet = pRight ? -1 : 0;
1193	return iRet;
1194	}
1195	RT_EXPORT_SYMBOL(RTTimeCompare);
1196

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source: vbox/trunk/src/VBox/Runtime/common/time/time.cpp@ 72150

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