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127 lines
4 KiB
C
127 lines
4 KiB
C
/*-------------------------------------------------------------------------
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*
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* nabstime.h
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* Definitions for the "new" abstime code.
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*
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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* $Id: nabstime.h,v 1.20 1999/05/25 16:14:56 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef NABSTIME_H
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#define NABSTIME_H
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#include <time.h>
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#include "utils/dt.h"
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/* ----------------------------------------------------------------
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* time types + support macros
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*
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*
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* ----------------------------------------------------------------
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*/
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/* The original typedefs are bogus - they assume that the system's 'time_t'
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* type is of size 32-bits. Under AlphaLinux, time_t is a long int, which
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* is 64-bits. Therefore, typedef these both as simply 'time_t', and let
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* the OS define what the size really is. -- RME 3/5/99
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*/
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typedef time_t AbsoluteTime;
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typedef time_t RelativeTime;
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typedef struct
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{
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int32 status;
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AbsoluteTime data[2];
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} TimeIntervalData;
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typedef TimeIntervalData *TimeInterval;
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/*
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* Reserved values
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* Epoch is Unix system time zero, but needs to be kept as a reserved
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* value rather than converting to time since timezone calculations
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* might move it away from 1970-01-01 00:00:00Z - tgl 97/02/20
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*
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* Pre-v6.1 code had large decimal numbers for reserved values.
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* These were chosen as special 32-bit bit patterns,
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* so redefine them explicitly using these bit patterns. - tgl 97/02/24
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*/
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#define EPOCH_ABSTIME ((AbsoluteTime) 0)
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#define INVALID_ABSTIME ((AbsoluteTime) 0x7FFFFFFE) /* 2147483647 == 2^31 -
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* 1 */
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#define CURRENT_ABSTIME ((AbsoluteTime) 0x7FFFFFFD) /* 2147483646 == 2^31 -
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* 2 */
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#define NOEND_ABSTIME ((AbsoluteTime) 0x7FFFFFFC) /* 2147483645 == 2^31 -
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* 3 */
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#define BIG_ABSTIME ((AbsoluteTime) 0x7FFFFFFB) /* 2147483644 == 2^31 -
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* 4 */
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#if defined(_AIX)
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/*
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* AIX considers 2147483648 == -2147483648 (since they have the same bit
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* representation) but uses a different sign sense in a comparison to
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* these integer constants depending on whether the constant is signed
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* or not!
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*/
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#define NOSTART_ABSTIME ((AbsoluteTime) INT_MIN)
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#else
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#define NOSTART_ABSTIME ((AbsoluteTime) 0x80000001) /* -2147483647 == - 2^31 */
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#endif /* _AIX */
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#define INVALID_RELTIME ((RelativeTime) 0x7FFFFFFE) /* 2147483647 == 2^31 -
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* 1 */
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#define AbsoluteTimeIsValid(time) \
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((bool) ((time) != INVALID_ABSTIME))
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#define AbsoluteTimeIsReal(time) \
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((bool) (((AbsoluteTime) time) < NOEND_ABSTIME && \
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((AbsoluteTime) time) > NOSTART_ABSTIME))
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/* have to include this because EPOCH_ABSTIME used to be invalid - yuk */
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#define AbsoluteTimeIsBackwardCompatiblyValid(time) \
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((bool) (((AbsoluteTime) time) != INVALID_ABSTIME && \
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((AbsoluteTime) time) > EPOCH_ABSTIME))
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#define AbsoluteTimeIsBackwardCompatiblyReal(time) \
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((bool) (((AbsoluteTime) time) < NOEND_ABSTIME && \
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((AbsoluteTime) time) > NOSTART_ABSTIME && \
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((AbsoluteTime) time) > EPOCH_ABSTIME))
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#define RelativeTimeIsValid(time) \
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((bool) (((RelativeTime) time) != INVALID_RELTIME))
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extern AbsoluteTime GetCurrentAbsoluteTime(void);
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/*
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* getSystemTime
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* Returns system time.
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*/
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#define getSystemTime() \
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((time_t) (time(0l)))
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/*
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* nabstime.c prototypes
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*/
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extern AbsoluteTime nabstimein(char *timestr);
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extern char *nabstimeout(AbsoluteTime time);
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extern bool abstimeeq(AbsoluteTime t1, AbsoluteTime t2);
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extern bool abstimene(AbsoluteTime t1, AbsoluteTime t2);
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extern bool abstimelt(AbsoluteTime t1, AbsoluteTime t2);
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extern bool abstimegt(AbsoluteTime t1, AbsoluteTime t2);
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extern bool abstimele(AbsoluteTime t1, AbsoluteTime t2);
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extern bool abstimege(AbsoluteTime t1, AbsoluteTime t2);
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extern bool abstime_finite(AbsoluteTime time);
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extern AbsoluteTime datetime_abstime(DateTime *datetime);
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extern DateTime *abstime_datetime(AbsoluteTime abstime);
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extern bool AbsoluteTimeIsBefore(AbsoluteTime time1, AbsoluteTime time2);
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extern void abstime2tm(AbsoluteTime time, int *tzp, struct tm * tm, char *tzn);
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#endif /* NABSTIME_H */
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