ReactOS 0.4.15-dev-7705-g2320c37
time.c File Reference
#include "precomp.h"
Include dependency graph for time.c:

Go to the source code of this file.

Macros

#define LEAPS_THRU_END_OF(y)   ((y)/4 - (y)/100 + (y)/400)
 

Functions

BOOLEAN NTAPI LlbIsLeapYear (IN ULONG Year)
 
ULONG NTAPI LlbDayOfMonth (IN ULONG Month, IN ULONG Year)
 
VOID NTAPI LlbConvertRtcTime (IN ULONG RtcTime, OUT TIMEINFO *TimeInfo)
 
TIMEINFO *NTAPI LlbGetTime (VOID)
 

Variables

UCHAR LlbDaysInMonth [] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
 
TIMEINFO LlbTime
 

Macro Definition Documentation

◆ LEAPS_THRU_END_OF

#define LEAPS_THRU_END_OF (   y)    ((y)/4 - (y)/100 + (y)/400)

Definition at line 11 of file time.c.

Function Documentation

◆ LlbConvertRtcTime()

VOID NTAPI LlbConvertRtcTime ( IN ULONG  RtcTime,
OUT TIMEINFO TimeInfo 
)

Definition at line 40 of file time.c.

42{
43 ULONG Month, Year, Days, DaysLeft;
44
45 /* Count the days, keep the minutes */
46 Days = RtcTime / 86400;
47 RtcTime -= Days * 86400;
48
49 /* Get the year, based on days since 1970 */
50 Year = 1970 + Days / 365;
51
52 /* Account for leap years which changed the number of days/year */
53 Days -= (Year - 1970) * 365 + LEAPS_THRU_END_OF(Year - 1) - LEAPS_THRU_END_OF(1970 - 1);
54 if (Days < 0)
55 {
56 /* We hit a leap year, so fixup the math */
57 Year--;
58 Days += 365 + LlbIsLeapYear(Year);
59 }
60
61 /* Count months */
62 for (Month = 0; Month < 11; Month++)
63 {
64 /* How many days in this month? */
65 DaysLeft = Days - LlbDayOfMonth(Month, Year);
66 if (DaysLeft < 0) break;
67
68 /* How many days left total? */
69 Days = DaysLeft;
70 }
71
72 /* Write the structure */
73 TimeInfo->Year = Year;
74 TimeInfo->Day = Days + 1;
75 TimeInfo->Month = Month + 1;
76 TimeInfo->Hour = RtcTime / 3600;
77 RtcTime -= TimeInfo->Hour * 3600;
78 TimeInfo->Minute = RtcTime / 60;
79 TimeInfo->Second = RtcTime - TimeInfo->Minute * 60;
80}
#define LEAPS_THRU_END_OF(y)
Definition: time.c:11
BOOLEAN NTAPI LlbIsLeapYear(IN ULONG Year)
Definition: time.c:23
ULONG NTAPI LlbDayOfMonth(IN ULONG Month, IN ULONG Year)
Definition: time.c:31
uint32_t ULONG
Definition: typedefs.h:59

Referenced by LlbGetTime().

◆ LlbDayOfMonth()

ULONG NTAPI LlbDayOfMonth ( IN ULONG  Month,
IN ULONG  Year 
)

Definition at line 31 of file time.c.

33{
34 /* Check how many days a month has, accounting for leap yearS */
35 return LlbDaysInMonth[Month] + (LlbIsLeapYear(Year) && Month == 1);
36}
UCHAR LlbDaysInMonth[]
Definition: time.c:13

Referenced by LlbConvertRtcTime().

◆ LlbGetTime()

TIMEINFO *NTAPI LlbGetTime ( VOID  )

Definition at line 84 of file time.c.

85{
86 ULONG RtcTime;
87
88 /* Read RTC time */
89 RtcTime = LlbHwRtcRead();
90#ifndef _ZOOM2_
91 /* Convert it */
92 LlbConvertRtcTime(RtcTime, &LlbTime);
93#endif
94 return &LlbTime;
95}
TIMEINFO LlbTime
Definition: time.c:16
VOID NTAPI LlbConvertRtcTime(IN ULONG RtcTime, OUT TIMEINFO *TimeInfo)
Definition: time.c:40
ULONG LlbHwRtcRead(VOID)
Definition: hwinfo.c:132

Referenced by LlbFwGetTime().

◆ LlbIsLeapYear()

BOOLEAN NTAPI LlbIsLeapYear ( IN ULONG  Year)

Definition at line 23 of file time.c.

24{
25 /* Every 4, 100, or 400 years */
26 return (!(Year % 4) && (Year % 100)) || !(Year % 400);
27}

Referenced by LlbConvertRtcTime(), and LlbDayOfMonth().

Variable Documentation

◆ LlbDaysInMonth

UCHAR LlbDaysInMonth[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}

Definition at line 13 of file time.c.

Referenced by LlbDayOfMonth().

◆ LlbTime

TIMEINFO LlbTime

Definition at line 16 of file time.c.

Referenced by LlbGetTime().