VirtualBox

source: vbox/trunk/src/VBox/Runtime/time.cpp@ 3254

Last change on this file since 3254 was 3254, checked in by vboxsync, 17 years ago

Fixed overflow detection.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 21.0 KB
Line 
1/* $Id: time.cpp 3254 2007-06-24 03:08:14Z vboxsync $ */
2/** @file
3 * innotek Portable Runtime - Time.
4 */
5
6/*
7 * Copyright (C) 2006-2007 innotek GmbH
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 as published by the Free Software Foundation,
13 * in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
14 * distribution. VirtualBox OSE is distributed in the hope that it will
15 * be useful, but WITHOUT ANY WARRANTY of any kind.
16 *
17 * If you received this file as part of a commercial VirtualBox
18 * distribution, then only the terms of your commercial VirtualBox
19 * license agreement apply instead of the previous paragraph.
20 */
21
22
23/*******************************************************************************
24* Header Files *
25*******************************************************************************/
26#define LOG_GROUP RTLOGGROUP_TIME
27#include <iprt/time.h>
28#include <iprt/string.h>
29#include <iprt/assert.h>
30#include "internal/time.h"
31
32
33/*******************************************************************************
34* Defined Constants And Macros *
35*******************************************************************************/
36/** The max year we possibly could implode. */
37#define RTTIME_MAX_YEAR (292 + 1970)
38/** The min year we possibly could implode. */
39#define RTTIME_MIN_YEAR (-293 + 1970)
40
41/** The max day supported by our time representation. (2262-04-11T23-47-16.854775807) */
42#define RTTIME_MAX_DAY (365*292+71 + 101-1)
43/** The min day supported by our time representation. (1677-09-21T00-12-43.145224192) */
44#define RTTIME_MIN_DAY (365*-293-70 + 264-1)
45
46/** The max nano second into the max day. (2262-04-11T23-47-16.854775807) */
47#define RTTIME_MAX_DAY_NANO ( INT64_C(1000000000) * (23*3600 + 47*60 + 16) + 854775807 )
48/** The min nano second into the min day. (1677-09-21T00-12-43.145224192) */
49#define RTTIME_MIN_DAY_NANO ( INT64_C(1000000000) * (00*3600 + 12*60 + 43) + 145224192 )
50
51
52/*******************************************************************************
53* Global Variables *
54*******************************************************************************/
55/**
56 * Days per month in a common year.
57 */
58static const uint8_t g_acDaysInMonths[12] =
59{
60 /*Jan Feb Mar Arp May Jun Jul Aug Sep Oct Nov Dec */
61 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
62};
63
64/**
65 * Days per month in a leap year.
66 */
67static const uint8_t g_acDaysInMonthsLeap[12] =
68{
69 /*Jan Feb Mar Arp May Jun Jul Aug Sep Oct Nov Dec */
70 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
71};
72
73/**
74 * The day of year for each month in a common year.
75 */
76static const uint16_t g_aiDayOfYear[12 + 1] =
77{
78 1, /* Jan */
79 1+31, /* Feb */
80 1+31+28, /* Mar */
81 1+31+28+31, /* Apr */
82 1+31+28+31+30, /* May */
83 1+31+28+31+30+31, /* Jun */
84 1+31+28+31+30+31+30, /* Jul */
85 1+31+28+31+30+31+30+31, /* Aug */
86 1+31+28+31+30+31+30+31+31, /* Sep */
87 1+31+28+31+30+31+30+31+31+30, /* Oct */
88 1+31+28+31+30+31+30+31+31+30+31, /* Nov */
89 1+31+28+31+30+31+30+31+31+30+31+30, /* Dec */
90 1+31+28+31+30+31+30+31+31+30+31+30+31
91};
92
93/**
94 * The day of year for each month in a leap year.
95 */
96static const uint16_t g_aiDayOfYearLeap[12 + 1] =
97{
98 1, /* Jan */
99 1+31, /* Feb */
100 1+31+29, /* Mar */
101 1+31+29+31, /* Apr */
102 1+31+29+31+30, /* May */
103 1+31+29+31+30+31, /* Jun */
104 1+31+29+31+30+31+30, /* Jul */
105 1+31+29+31+30+31+30+31, /* Aug */
106 1+31+29+31+30+31+30+31+31, /* Sep */
107 1+31+29+31+30+31+30+31+31+30, /* Oct */
108 1+31+29+31+30+31+30+31+31+30+31, /* Nov */
109 1+31+29+31+30+31+30+31+31+30+31+30, /* Dec */
110 1+31+29+31+30+31+30+31+31+30+31+30+31
111};
112
113/** The index of 1970 in g_aoffYear */
114#define OFF_YEAR_IDX_EPOCH 300
115/** The year of the first index. */
116#define OFF_YEAR_IDX_0_YEAR 1670
117
118/**
119 * The number of days the 1st of january a year is offseted from 1970-01-01.
120 */
121static const int32_t g_aoffYear[] =
122{
123/*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,
124/*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,
125/*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,
126/*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,
127/*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,
128/*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,
129/*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,
130/*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,
131/*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,
132/*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,
133/*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,
134/*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,
135/*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,
136/*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,
137/*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,
138/*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,
139/*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,
140/*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,
141/*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,
142/*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,
143/*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,
144/*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,
145/*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,
146/*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,
147/*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,
148/*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,
149/*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 ,
150/*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 ,
151/*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 ,
152/*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 ,
153/*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 ,
154/*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 ,
155/*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 ,
156/*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 ,
157/*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 ,
158/*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 ,
159/*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 ,
160/*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 ,
161/*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 ,
162/*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 ,
163/*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 ,
164/*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 ,
165/*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 ,
166/*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 ,
167/*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 ,
168/*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 ,
169/*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 ,
170/*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 ,
171/*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 ,
172/*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 ,
173/*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 ,
174/*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 ,
175/*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 ,
176/*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 ,
177/*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 ,
178/*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 ,
179/*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 ,
180/*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 ,
181/*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 ,
182/*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
183};
184
185/* generator code:
186#include <stdio.h>
187bool isLeapYear(int iYear)
188{
189 return iYear % 4 == 0 && (iYear % 100 != 0 || iYear % 400 == 0);
190}
191void printYear(int iYear, int iLeap)
192{
193 if (!(iYear % 10))
194 printf("\n/" "*%d:*" "/", iYear + 1970);
195 printf(" 365*%4d+%-3d,", iYear, iLeap);
196}
197int main()
198{
199 int iYear = 0;
200 int iLeap = 0;
201 while (iYear > -300)
202 iLeap -= isLeapYear(1970 + --iYear);
203 while (iYear < 300)
204 {
205 printYear(iYear, iLeap);
206 iLeap += isLeapYear(1970 + iYear++);
207 }
208 printf("\n");
209 return 0;
210}
211*/
212
213
214/**
215 * Checks if a year is a leap year or not.
216 *
217 * @returns true if it's a leap year.
218 * @returns false if it's a common year.
219 * @param i32Year The year in question.
220 */
221DECLINLINE(bool) rtTimeIsLeapYear(int32_t i32Year)
222{
223 return i32Year % 4 == 0
224 && ( i32Year % 100 != 0
225 || i32Year % 400 == 0);
226}
227
228/**
229 * Checks if a year is a leap year or not.
230 *
231 * @returns true if it's a leap year.
232 * @returns false if it's a common year.
233 * @param i32Year The year in question.
234 */
235RTDECL(bool) RTTimeIsLeapYear(int32_t i32Year)
236{
237 return rtTimeIsLeapYear(i32Year);
238}
239
240
241/**
242 * Explodes a time spec (UTC).
243 *
244 * @returns pTime.
245 * @param pTime Where to store the exploded time.
246 * @param pTimeSpec The time spec to exploded.
247 */
248RTDECL(PRTTIME) RTTimeExplode(PRTTIME pTime, PCRTTIMESPEC pTimeSpec)
249{
250 AssertMsg(VALID_PTR(pTime), ("%p\n", pTime));
251 AssertMsg(VALID_PTR(pTimeSpec), ("%p\n", pTime));
252
253 /*
254 * The simple stuff first.
255 */
256 pTime->fFlags = RTTIME_FLAGS_TYPE_UTC;
257 int64_t i64Div = pTimeSpec->i64NanosecondsRelativeToUnixEpoch;
258 int32_t i32Rem = (int32_t)(i64Div % 1000000000);
259 i64Div /= 1000000000;
260 if (i32Rem < 0)
261 {
262 i32Rem += 1000000000;
263 i64Div--;
264 }
265 pTime->u32Nanosecond = i32Rem;
266
267 /* second */
268 i32Rem = (int32_t)(i64Div % 60);
269 i64Div /= 60;
270 if (i32Rem < 0)
271 {
272 i32Rem += 60;
273 i64Div--;
274 }
275 pTime->u8Second = i32Rem;
276
277 /* minute */
278 int32_t i32Div = (int32_t)i64Div; /* 60,000,000,000 > 33bit, so 31bit suffices. */
279 i32Rem = i32Div % 60;
280 i32Div /= 60;
281 if (i32Rem < 0)
282 {
283 i32Rem += 60;
284 i32Div--;
285 }
286 pTime->u8Minute = i32Rem;
287
288 /* hour */
289 i32Rem = i32Div % 24;
290 i32Div /= 24; /* days relative to 1970-01-01 */
291 if (i32Rem < 0)
292 {
293 i32Rem += 24;
294 i32Div--;
295 }
296 pTime->u8Hour = i32Rem;
297
298 /* weekday - 1970-01-01 was a Thursday (3) */
299 pTime->u8WeekDay = (uint32_t)(i32Div + 3) % 7;
300
301 /*
302 * We've now got a number of days relative to 1970-01-01.
303 * To get the correct year number we have to mess with leap years. Fortunatly,
304 * the represenation we've got only supports a few hundred years, so we can
305 * generate a table and perform a simple two way search from the modulus 365 derived.
306 */
307 unsigned iYear = OFF_YEAR_IDX_EPOCH + i32Div / 365;
308 while (g_aoffYear[iYear + 1] <= i32Div)
309 iYear++;
310 while (g_aoffYear[iYear] > i32Div)
311 iYear--;
312 pTime->i32Year = iYear + OFF_YEAR_IDX_0_YEAR;
313 i32Div -= g_aoffYear[iYear];
314 pTime->u16YearDay = i32Div + 1;
315
316 /*
317 * Figuring out the month is done in a manner similar to the year, only here we
318 * ensure that the index is matching or too small.
319 */
320 const uint16_t *paiDayOfYear;
321 if (rtTimeIsLeapYear(pTime->i32Year))
322 {
323 pTime->fFlags |= RTTIME_FLAGS_LEAP_YEAR;
324 paiDayOfYear = &g_aiDayOfYearLeap[0];
325 }
326 else
327 {
328 pTime->fFlags |= RTTIME_FLAGS_COMMON_YEAR;
329 paiDayOfYear = &g_aiDayOfYear[0];
330 }
331 int iMonth = i32Div / 32;
332 i32Div++;
333 while (paiDayOfYear[iMonth + 1] <= i32Div)
334 iMonth++;
335 pTime->u8Month = iMonth + 1;
336 i32Div -= paiDayOfYear[iMonth];
337 pTime->u8MonthDay = i32Div + 1;
338
339 return pTime;
340}
341
342
343/**
344 * Implodes exploded time to a time spec (UTC).
345 *
346 * @returns pTime on success.
347 * @returns NULL if the pTime data is invalid.
348 * @param pTimeSpec Where to store the imploded UTC time.
349 * If pTime specifies a time which outside the range, maximum or
350 * minimum values will be returned.
351 * @param pTime Pointer to the exploded time to implode.
352 * The fields u8Month, u8WeekDay and u8MonthDay are not used,
353 * and all the other fields are expected to be within their
354 * bounds. Use RTTimeNormalize() to calculate u16YearDay and
355 * normalize the ranges of the fields.
356 */
357RTDECL(PRTTIMESPEC) RTTimeImplode(PRTTIMESPEC pTimeSpec, PCRTTIME pTime)
358{
359 /*
360 * Validate input.
361 */
362 AssertReturn(VALID_PTR(pTimeSpec), NULL);
363 AssertReturn(VALID_PTR(pTime), NULL);
364 AssertReturn(pTime->u32Nanosecond < 1000000000, NULL);
365 AssertReturn(pTime->u8Second < 60, NULL);
366 AssertReturn(pTime->u8Minute < 60, NULL);
367 AssertReturn(pTime->u8Hour < 24, NULL);
368 AssertReturn(pTime->u16YearDay >= 1, NULL);
369 AssertReturn(pTime->u16YearDay <= (rtTimeIsLeapYear(pTime->i32Year) ? 366 : 365), NULL);
370 AssertMsgReturn(pTime->i32Year <= RTTIME_MAX_YEAR && pTime->i32Year >= RTTIME_MIN_YEAR, ("%RI32\n", pTime->i32Year), NULL);
371
372 /*
373 * Do the conversion to nanoseconds.
374 */
375 int32_t i32Days = g_aoffYear[pTime->i32Year - OFF_YEAR_IDX_0_YEAR]
376 + pTime->u16YearDay - 1;
377 AssertMsgReturn(i32Days <= RTTIME_MAX_DAY && i32Days >= RTTIME_MIN_DAY, ("%RI32\n", i32Days), NULL);
378
379 uint32_t u32Secs = pTime->u8Second
380 + pTime->u8Minute * 60
381 + pTime->u8Hour * 3600;
382 int64_t i64Nanos = (uint64_t)pTime->u32Nanosecond
383 + u32Secs * UINT64_C(1000000000);
384 AssertMsgReturn(i32Days != RTTIME_MAX_DAY || i64Nanos <= RTTIME_MAX_DAY_NANO, ("%RI64\n", i64Nanos), NULL);
385 AssertMsgReturn(i32Days != RTTIME_MIN_DAY || i64Nanos >= RTTIME_MIN_DAY_NANO, ("%RI64\n", i64Nanos), NULL);
386
387 i64Nanos += i32Days * UINT64_C(86400000000000);
388
389 pTimeSpec->i64NanosecondsRelativeToUnixEpoch = i64Nanos;
390 return pTimeSpec;
391}
392
393
394/**
395 * Normalizes the fields of a timestructure.
396 *
397 * It is possible to calculate month/day fields in some
398 * combinations. It's also possible to overflow other
399 * fields, and these overflows will be adjusted for.
400 *
401 * @returns pTime on success.
402 * @returns NULL if the data is invalid.
403 * @param pTime The time structure to normalize.
404 */
405RTDECL(PRTTIME) RTTimeNormalize(PRTTIME pTime)
406{
407 /** @todo */
408 return NULL;
409}
410
411
412/**
413 * Converts a time spec to a ISO date string.
414 *
415 * @returns psz on success.
416 * @returns NULL on buffer underflow.
417 * @param pTime The time. Caller should've normalized this.
418 * @param psz Where to store the string.
419 * @param cb The size of the buffer.
420 */
421RTDECL(char *) RTTimeToString(PCRTTIME pTime, char *psz, size_t cb)
422{
423 size_t cch = RTStrPrintf(psz, cb, "%RI32-%02u-%02uT%02u:%02u:%02u.%09RU32Z",
424 pTime->i32Year, pTime->u8Month, pTime->u8MonthDay,
425 pTime->u8Hour, pTime->u8Minute, pTime->u8Second, pTime->u32Nanosecond);
426 if ( cch <= 1
427 || psz[cch - 1] != 'Z')
428 return NULL;
429 return psz;
430}
431
432
433/**
434 * Converts a time spec to a ISO date string.
435 *
436 * @returns psz on success.
437 * @returns NULL on buffer underflow.
438 * @param pTime The time spec.
439 * @param psz Where to store the string.
440 * @param cb The size of the buffer.
441 */
442RTDECL(char *) RTTimeSpecToString(PCRTTIMESPEC pTime, char *psz, size_t cb)
443{
444 RTTIME Time;
445 return RTTimeToString(RTTimeExplode(&Time, pTime), psz, cb);
446}
447
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