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Postgres95 1.01 Distribution - Virgin Sources
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Marc G. Fournier
165
src/backend/utils/nabstime.h
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165
src/backend/utils/nabstime.h
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/*-------------------------------------------------------------------------
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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 1.1.1.1 1996/07/09 06:22:02 scrappy 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 <sys/types.h>
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#include <time.h>
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#if !defined(PORTNAME_irix5)
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#include <sys/timeb.h>
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#endif
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#include "miscadmin.h" /* for SystemTime */
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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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typedef int32 AbsoluteTime;
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typedef int32 RelativeTime;
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typedef struct {
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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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#define EPOCH_ABSTIME ((AbsoluteTime) 0)
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#define INVALID_ABSTIME ((AbsoluteTime) 2147483647) /* 2^31 - 1 */
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#define CURRENT_ABSTIME ((AbsoluteTime) 2147483646) /* 2^31 - 2 */
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#define NOEND_ABSTIME ((AbsoluteTime) 2147483645) /* 2^31 - 3 */
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#if defined(PORTNAME_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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#include <values.h>
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/*#define NOSTART_ABSTIME ((AbsoluteTime) HIBITI) */ /* - 2^31 */
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#define NOSTART_ABSTIME ((AbsoluteTime) INT_MIN)
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#else
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/*#define NOSTART_ABSTIME ((AbsoluteTime) 2147483648)*/ /* - 2^31 */
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#define NOSTART_ABSTIME ((AbsoluteTime) -2147483647) /* - 2^31 */
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#endif /* PORTNAME_aix */
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#define INVALID_RELTIME ((RelativeTime) 2147483647) /* 2^31 - 1 */
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/* ----------------
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* time support macros (from tim.h)
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* ----------------
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*/
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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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#define GetCurrentAbsoluteTime() \
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((AbsoluteTime) getSystemTime())
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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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* Meridian: am, pm, or 24-hour style.
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*/
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#define AM 0
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#define PM 1
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#define HR24 2
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/* can't have more of these than there are bits in an unsigned long */
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#define MONTH 1
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#define YEAR 2
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#define DAY 3
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#define TIME 4
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#define TZ 5
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#define DTZ 6
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#define PG_IGNORE 7
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#define AMPM 8
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/* below here are unused so far */
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#define SECONDS 9
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#define MONTHS 10
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#define YEARS 11
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#define NUMBER 12
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/* these are only for relative dates */
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#define ABS_BEFORE 13
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#define ABS_AFTER 14
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#define AGO 15
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#define SECS(n) ((time_t)(n))
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#define MINS(n) ((time_t)(n) * SECS(60))
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#define HOURS(n) ((time_t)(n) * MINS(60)) /* 3600 secs */
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#define DAYS(n) ((time_t)(n) * HOURS(24)) /* 86400 secs */
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/* months and years are not constant length, must be specially dealt with */
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#define TOKMAXLEN 6 /* only this many chars are stored in datetktbl */
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/* keep this struct small; it gets used a lot */
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typedef struct {
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#if defined(PORTNAME_aix)
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char *token;
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#else
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char token[TOKMAXLEN];
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#endif /* PORTNAME_aix */
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char type;
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char value; /* this may be unsigned, alas */
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} datetkn;
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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 int prsabsdate(char *timestr, struct tm *tm, int *tzp);
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extern int tryabsdate(char *fields[], int nf, struct tm *tm, int *tzp);
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extern int parsetime(char *time, struct tm *tm);
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extern int split(char *string, char *fields[], int nfields, char *sep);
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extern char *nabstimeout(AbsoluteTime time);
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extern AbsoluteTime dateconv(struct tm *tm, int zone);
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extern time_t qmktime(struct tm *tp);
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extern datetkn *datetoktype(char *s, int *bigvalp);
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extern datetkn *datebsearch(char *key, datetkn *base, unsigned int nel);
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extern bool AbsoluteTimeIsBefore(AbsoluteTime time1, AbsoluteTime time2);
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extern bool AbsoluteTimeIsAfter(AbsoluteTime time1, AbsoluteTime time2);
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extern int32 abstimeeq(AbsoluteTime t1, AbsoluteTime t2);
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extern int32 abstimene(AbsoluteTime t1, AbsoluteTime t2);
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extern int32 abstimelt(AbsoluteTime t1, AbsoluteTime t2);
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extern int32 abstimegt(AbsoluteTime t1, AbsoluteTime t2);
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extern int32 abstimele(AbsoluteTime t1, AbsoluteTime t2);
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extern int32 abstimege(AbsoluteTime t1, AbsoluteTime t2);
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#endif /* NABSTIME_H */
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