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/*-------------------------------------------------------------------------
*
* nabstime.h
* Definitions for the "new" abstime code.
*
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: nabstime.h,v 1.18 1999/02/13 23:22:25 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef NABSTIME_H
#define NABSTIME_H
#include <time.h>
#include "utils/dt.h"
/* ----------------------------------------------------------------
* time types + support macros
*
*
* ----------------------------------------------------------------
*/
typedef int32 AbsoluteTime;
typedef int32 RelativeTime;
typedef struct
{
int32 status;
AbsoluteTime data[2];
} TimeIntervalData;
typedef TimeIntervalData *TimeInterval;
/*
* Reserved values
* Epoch is Unix system time zero, but needs to be kept as a reserved
* value rather than converting to time since timezone calculations
* might move it away from 1970-01-01 00:00:00Z - tgl 97/02/20
*
* Pre-v6.1 code had large decimal numbers for reserved values.
* These were chosen as special 32-bit bit patterns,
* so redefine them explicitly using these bit patterns. - tgl 97/02/24
*/
#define EPOCH_ABSTIME ((AbsoluteTime) 0)
#define INVALID_ABSTIME ((AbsoluteTime) 0x7FFFFFFE) /* 2147483647 == 2^31 -
* 1 */
#define CURRENT_ABSTIME ((AbsoluteTime) 0x7FFFFFFD) /* 2147483646 == 2^31 -
* 2 */
#define NOEND_ABSTIME ((AbsoluteTime) 0x7FFFFFFC) /* 2147483645 == 2^31 -
* 3 */
#define BIG_ABSTIME ((AbsoluteTime) 0x7FFFFFFB) /* 2147483644 == 2^31 -
* 4 */
#if defined(_AIX)
/*
* AIX considers 2147483648 == -2147483648 (since they have the same bit
* representation) but uses a different sign sense in a comparison to
* these integer constants depending on whether the constant is signed
* or not!
*/
#define NOSTART_ABSTIME ((AbsoluteTime) INT_MIN)
#else
#define NOSTART_ABSTIME ((AbsoluteTime) 0x80000001) /* -2147483647 == - 2^31 */
#endif /* _AIX */
#define INVALID_RELTIME ((RelativeTime) 0x7FFFFFFE) /* 2147483647 == 2^31 -
* 1 */
#define AbsoluteTimeIsValid(time) \
((bool) ((time) != INVALID_ABSTIME))
#define AbsoluteTimeIsReal(time) \
((bool) (((AbsoluteTime) time) < NOEND_ABSTIME && \
((AbsoluteTime) time) > NOSTART_ABSTIME))
/* have to include this because EPOCH_ABSTIME used to be invalid - yuk */
#define AbsoluteTimeIsBackwardCompatiblyValid(time) \
((bool) (((AbsoluteTime) time) != INVALID_ABSTIME && \
((AbsoluteTime) time) > EPOCH_ABSTIME))
#define AbsoluteTimeIsBackwardCompatiblyReal(time) \
((bool) (((AbsoluteTime) time) < NOEND_ABSTIME && \
((AbsoluteTime) time) > NOSTART_ABSTIME && \
((AbsoluteTime) time) > EPOCH_ABSTIME))
#define RelativeTimeIsValid(time) \
((bool) (((RelativeTime) time) != INVALID_RELTIME))
extern AbsoluteTime GetCurrentAbsoluteTime(void);
/*
* getSystemTime
* Returns system time.
*/
#define getSystemTime() \
((time_t) (time(0l)))
/*
* nabstime.c prototypes
*/
extern AbsoluteTime nabstimein(char *timestr);
extern char *nabstimeout(AbsoluteTime time);
extern bool abstimeeq(AbsoluteTime t1, AbsoluteTime t2);
extern bool abstimene(AbsoluteTime t1, AbsoluteTime t2);
extern bool abstimelt(AbsoluteTime t1, AbsoluteTime t2);
extern bool abstimegt(AbsoluteTime t1, AbsoluteTime t2);
extern bool abstimele(AbsoluteTime t1, AbsoluteTime t2);
extern bool abstimege(AbsoluteTime t1, AbsoluteTime t2);
extern bool abstime_finite(AbsoluteTime time);
extern AbsoluteTime datetime_abstime(DateTime *datetime);
extern DateTime *abstime_datetime(AbsoluteTime abstime);
extern bool AbsoluteTimeIsBefore(AbsoluteTime time1, AbsoluteTime time2);
extern void abstime2tm(AbsoluteTime time, int *tzp, struct tm * tm, char *tzn);
#endif /* NABSTIME_H */
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