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postgres/src/include/utils/timestamp.h
Thomas G. Lockhart 41f1f5b76a Implement "date/time grand unification". 
Transform datetime and timespan into timestamp and interval.
 Deprecate datetime and timespan, though translate to new types in gram.y.
 Transform all datetime and timespan catalog entries into new types.
 Make "INTERVAL" reserved word allowed as a column identifier in gram.y.
 Remove dt.h, dt.c files, and retarget datetime.h, datetime.c as utility
  routines for all date/time types.
 date.{h,c} now deals with date, time types.
 timestamp.{h,c} now deals with timestamp, interval types.
 nabstime.{h,c} now deals with abstime, reltime, tinterval types.
Make NUMERIC a known native type for purposes of type coersion. Not tested.
2000-02-16 17:26:26 +00:00

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/*-------------------------------------------------------------------------
*
* timestamp.h
* Definitions for the SQL92 "timestamp" and "interval" types.
*
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: timestamp.h,v 1.1 2000/02/16 17:26:26 thomas Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef TIMESTAMP_H
#define TIMESTAMP_H
#include <time.h>
#include <math.h>
#include <limits.h>
/*
* Timestamp represents absolute time.
* Interval represents delta time. Keep track of months (and years)
* separately since the elapsed time spanned is unknown until instantiated
* relative to an absolute time.
*
* Note that Postgres uses "time interval" to mean a bounded interval,
* consisting of a beginning and ending time, not a time span - thomas 97/03/20
*/
typedef double Timestamp;
typedef struct
{
double time; /* all time units other than months and
* years */
int4 month; /* months and years, after time for
* alignment */
} Interval;
#ifdef NAN
#define DT_INVALID (NAN)
#else
#define DT_INVALID (DBL_MIN+DBL_MIN)
#endif
#ifdef HUGE_VAL
#define DT_NOBEGIN (-HUGE_VAL)
#define DT_NOEND (HUGE_VAL)
#else
#define DT_NOBEGIN (-DBL_MAX)
#define DT_NOEND (DBL_MAX)
#endif
#define DT_CURRENT (DBL_MIN)
#define DT_EPOCH (-DBL_MIN)
#define TIMESTAMP_INVALID(j) {j = DT_INVALID;}
#ifdef NAN
#define TIMESTAMP_IS_INVALID(j) (isnan(j))
#else
#define TIMESTAMP_IS_INVALID(j) (j == DT_INVALID)
#endif
#define TIMESTAMP_NOBEGIN(j) {j = DT_NOBEGIN;}
#define TIMESTAMP_IS_NOBEGIN(j) (j == DT_NOBEGIN)
#define TIMESTAMP_NOEND(j) {j = DT_NOEND;}
#define TIMESTAMP_IS_NOEND(j) (j == DT_NOEND)
#define TIMESTAMP_CURRENT(j) {j = DT_CURRENT;}
#if defined(linux) && defined(__powerpc__)
extern int timestamp_is_current(double j);
#define TIMESTAMP_IS_CURRENT(j) timestamp_is_current(j)
#else
#define TIMESTAMP_IS_CURRENT(j) (j == DT_CURRENT)
#endif
#define TIMESTAMP_EPOCH(j) {j = DT_EPOCH;}
#if defined(linux) && defined(__powerpc__)
extern int timestamp_is_epoch(double j);
#define TIMESTAMP_IS_EPOCH(j) timestamp_is_epoch(j)
#else
#define TIMESTAMP_IS_EPOCH(j) (j == DT_EPOCH)
#endif
#define TIMESTAMP_IS_RELATIVE(j) (TIMESTAMP_IS_CURRENT(j) || TIMESTAMP_IS_EPOCH(j))
#define TIMESTAMP_NOT_FINITE(j) (TIMESTAMP_IS_INVALID(j) \
|| TIMESTAMP_IS_NOBEGIN(j) || TIMESTAMP_IS_NOEND(j))
#define TIMESTAMP_IS_RESERVED(j) (TIMESTAMP_IS_RELATIVE(j) || TIMESTAMP_NOT_FINITE(j))
#define INTERVAL_INVALID(j) {(j).time = DT_INVALID;}
#ifdef NAN
#define INTERVAL_IS_INVALID(j) (isnan((j).time))
#else
#define INTERVAL_IS_INVALID(j) ((j).time == DT_INVALID)
#endif
#define INTERVAL_NOT_FINITE(j) INTERVAL_IS_INVALID(j)
#define TIME_PREC_INV 1000000.0
#define JROUND(j) (rint(((double) (j))*TIME_PREC_INV)/TIME_PREC_INV)
#if 0
/*
* Date/time validation
* Include check for leap year.
*/
extern int day_tab[2][13];
#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
/* Julian date support for date2j() and j2date()
* Set the minimum year to one greater than the year of the first valid day
* to avoid having to check year and day both. - tgl 97/05/08
*/
#define JULIAN_MINYEAR (-4713)
#define JULIAN_MINMONTH (11)
#define JULIAN_MINDAY (23)
#define IS_VALID_JULIAN(y,m,d) ((y > JULIAN_MINYEAR) \
|| ((y == JULIAN_MINYEAR) && ((m > JULIAN_MINMONTH) \
|| ((m == JULIAN_MINMONTH) && (d >= JULIAN_MINDAY)))))
#define UTIME_MINYEAR (1901)
#define UTIME_MINMONTH (12)
#define UTIME_MINDAY (14)
#define UTIME_MAXYEAR (2038)
#define UTIME_MAXMONTH (01)
#define UTIME_MAXDAY (18)
#define IS_VALID_UTIME(y,m,d) (((y > UTIME_MINYEAR) \
|| ((y == UTIME_MINYEAR) && ((m > UTIME_MINMONTH) \
|| ((m == UTIME_MINMONTH) && (d >= UTIME_MINDAY))))) \
&& ((y < UTIME_MAXYEAR) \
|| ((y == UTIME_MAXYEAR) && ((m < UTIME_MAXMONTH) \
|| ((m == UTIME_MAXMONTH) && (d <= UTIME_MAXDAY))))))
#endif
/*
* timestamp.c prototypes
*/
extern Timestamp *timestamp_in(char *str);
extern char *timestamp_out(Timestamp *dt);
extern bool timestamp_eq(Timestamp *dt1, Timestamp *dt2);
extern bool timestamp_ne(Timestamp *dt1, Timestamp *dt2);
extern bool timestamp_lt(Timestamp *dt1, Timestamp *dt2);
extern bool timestamp_le(Timestamp *dt1, Timestamp *dt2);
extern bool timestamp_ge(Timestamp *dt1, Timestamp *dt2);
extern bool timestamp_gt(Timestamp *dt1, Timestamp *dt2);
extern bool timestamp_finite(Timestamp *timestamp);
extern int timestamp_cmp(Timestamp *dt1, Timestamp *dt2);
extern Timestamp *timestamp_smaller(Timestamp *dt1, Timestamp *dt2);
extern Timestamp *timestamp_larger(Timestamp *dt1, Timestamp *dt2);
extern Interval *interval_in(char *str);
extern char *interval_out(Interval *span);
extern bool interval_eq(Interval *span1, Interval *span2);
extern bool interval_ne(Interval *span1, Interval *span2);
extern bool interval_lt(Interval *span1, Interval *span2);
extern bool interval_le(Interval *span1, Interval *span2);
extern bool interval_ge(Interval *span1, Interval *span2);
extern bool interval_gt(Interval *span1, Interval *span2);
extern bool interval_finite(Interval *span);
extern int interval_cmp(Interval *span1, Interval *span2);
extern Interval *interval_smaller(Interval *span1, Interval *span2);
extern Interval *interval_larger(Interval *span1, Interval *span2);
extern text *timestamp_text(Timestamp *timestamp);
extern Timestamp *text_timestamp(text *str);
extern text *interval_text(Interval *interval);
extern Interval *text_interval(text *str);
extern Timestamp *timestamp_trunc(text *units, Timestamp *timestamp);
extern Interval *interval_trunc(text *units, Interval *interval);
extern float64 timestamp_part(text *units, Timestamp *timestamp);
extern float64 interval_part(text *units, Interval *interval);
extern text *timestamp_zone(text *zone, Timestamp *timestamp);
extern Interval *interval_um(Interval *span);
extern Interval *interval_pl(Interval *span1, Interval *span2);
extern Interval *interval_mi(Interval *span1, Interval *span2);
extern Interval *interval_div(Interval *span1, float8 *arg2);
extern Interval *timestamp_mi(Timestamp *dt1, Timestamp *dt2);
extern Timestamp *timestamp_pl_span(Timestamp *dt, Interval *span);
extern Timestamp *timestamp_mi_span(Timestamp *dt, Interval *span);
extern Interval *timestamp_age(Timestamp *dt1, Timestamp *dt2);
extern int tm2timestamp(struct tm * tm, double fsec, int *tzp, Timestamp *dt);
extern int timestamp2tm(Timestamp dt, int *tzp, struct tm * tm, double *fsec, char **tzn);
extern Timestamp SetTimestamp(Timestamp timestamp);
extern Timestamp dt2local(Timestamp dt, int timezone);
extern void dt2time(Timestamp dt, int *hour, int *min, double *sec);
extern int EncodeSpecialTimestamp(Timestamp dt, char *str);
extern int interval2tm(Interval span, struct tm * tm, float8 *fsec);
extern int tm2interval(struct tm * tm, double fsec, Interval *span);
extern Timestamp *now(void);
#endif /* TIMESTAMP_H */
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