327 lines
8.9 KiB
C
327 lines
8.9 KiB
C
/*-------------------------------------------------------------------------
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*
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* datetime.h
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* Definitions for the date/time and other date/time support code.
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* The support code is shared with other date data types,
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* including abstime, reltime, date, and time.
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*
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*
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* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/utils/datetime.h,v 1.48 2004/05/21 05:08:05 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef DATETIME_H
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#define DATETIME_H
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#include <limits.h>
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#include <math.h>
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#include "pgtime.h"
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#include "utils/timestamp.h"
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/* ----------------------------------------------------------------
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* time types + support macros
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*
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* String definitions for standard time quantities.
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*
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* These strings are the defaults used to form output time strings.
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* Other alternate forms are hardcoded into token tables in datetime.c.
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* ----------------------------------------------------------------
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*/
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#define DAGO "ago"
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#define DCURRENT "current"
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#define EPOCH "epoch"
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#define INVALID "invalid"
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#define EARLY "-infinity"
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#define LATE "infinity"
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#define NOW "now"
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#define TODAY "today"
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#define TOMORROW "tomorrow"
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#define YESTERDAY "yesterday"
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#define ZULU "zulu"
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#define DMICROSEC "usecond"
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#define DMILLISEC "msecond"
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#define DSECOND "second"
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#define DMINUTE "minute"
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#define DHOUR "hour"
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#define DDAY "day"
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#define DWEEK "week"
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#define DMONTH "month"
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#define DQUARTER "quarter"
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#define DYEAR "year"
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#define DDECADE "decade"
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#define DCENTURY "century"
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#define DMILLENNIUM "millennium"
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#define DA_D "ad"
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#define DB_C "bc"
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#define DTIMEZONE "timezone"
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/*
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* Fundamental time field definitions for parsing.
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*
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* Meridian: am, pm, or 24-hour style.
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* Millennium: ad, bc
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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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#define AD 0
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#define BC 1
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/*
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* Fields for time decoding.
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*
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* Can't have more of these than there are bits in an unsigned int
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* since these are turned into bit masks during parsing and decoding.
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*
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* Furthermore, the values for YEAR, MONTH, DAY, HOUR, MINUTE, SECOND
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* must be in the range 0..14 so that the associated bitmasks can fit
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* into the left half of an INTERVAL's typmod value.
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*/
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#define RESERV 0
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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 JULIAN 4
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#define TZ 5
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#define DTZ 6
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#define DTZMOD 7
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#define IGNORE_DTF 8
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#define AMPM 9
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#define HOUR 10
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#define MINUTE 11
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#define SECOND 12
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#define DOY 13
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#define DOW 14
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#define UNITS 15
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#define ADBC 16
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/* these are only for relative dates */
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#define AGO 17
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#define ABS_BEFORE 18
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#define ABS_AFTER 19
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/* generic fields to help with parsing */
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#define ISODATE 20
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#define ISOTIME 21
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/* reserved for unrecognized string values */
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#define UNKNOWN_FIELD 31
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/*
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* Token field definitions for time parsing and decoding.
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* These need to fit into the datetkn table type.
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* At the moment, that means keep them within [-127,127].
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* These are also used for bit masks in DecodeDateDelta()
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* so actually restrict them to within [0,31] for now.
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* - thomas 97/06/19
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* Not all of these fields are used for masks in DecodeDateDelta
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* so allow some larger than 31. - thomas 1997-11-17
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*/
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#define DTK_NUMBER 0
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#define DTK_STRING 1
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#define DTK_DATE 2
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#define DTK_TIME 3
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#define DTK_TZ 4
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#define DTK_AGO 5
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#define DTK_SPECIAL 6
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#define DTK_INVALID 7
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#define DTK_CURRENT 8
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#define DTK_EARLY 9
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#define DTK_LATE 10
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#define DTK_EPOCH 11
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#define DTK_NOW 12
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#define DTK_YESTERDAY 13
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#define DTK_TODAY 14
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#define DTK_TOMORROW 15
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#define DTK_ZULU 16
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#define DTK_DELTA 17
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#define DTK_SECOND 18
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#define DTK_MINUTE 19
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#define DTK_HOUR 20
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#define DTK_DAY 21
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#define DTK_WEEK 22
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#define DTK_MONTH 23
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#define DTK_QUARTER 24
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#define DTK_YEAR 25
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#define DTK_DECADE 26
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#define DTK_CENTURY 27
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#define DTK_MILLENNIUM 28
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#define DTK_MILLISEC 29
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#define DTK_MICROSEC 30
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#define DTK_JULIAN 31
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#define DTK_DOW 32
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#define DTK_DOY 33
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#define DTK_TZ_HOUR 34
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#define DTK_TZ_MINUTE 35
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/*
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* Bit mask definitions for time parsing.
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*/
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#define DTK_M(t) (0x01 << (t))
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#define DTK_DATE_M (DTK_M(YEAR) | DTK_M(MONTH) | DTK_M(DAY))
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#define DTK_TIME_M (DTK_M(HOUR) | DTK_M(MINUTE) | DTK_M(SECOND))
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#define MAXDATELEN 51 /* maximum possible length of an input
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* date string (not counting tr. null) */
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#define MAXDATEFIELDS 25 /* maximum possible number of fields in a
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* date string */
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#define TOKMAXLEN 10 /* only this many chars are stored in
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* datetktbl */
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/* keep this struct small; it gets used a lot */
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typedef struct
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{
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#if defined(_AIX)
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char *token;
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#else
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char token[TOKMAXLEN];
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#endif /* _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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/* FMODULO()
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* Macro to replace modf(), which is broken on some platforms.
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* t = input and remainder
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* q = integer part
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* u = divisor
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*/
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#define FMODULO(t,q,u) \
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do { \
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q = ((t < 0) ? ceil(t / u) : floor(t / u)); \
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if (q != 0) t -= rint(q * u); \
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} while(0)
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/* TMODULO()
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* Like FMODULO(), but work on the timestamp datatype (either int64 or float8).
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* We assume that int64 follows the C99 semantics for division (negative
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* quotients truncate towards zero).
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*/
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#ifdef HAVE_INT64_TIMESTAMP
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#define TMODULO(t,q,u) \
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do { \
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q = (t / u); \
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if (q != 0) t -= (q * u); \
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} while(0)
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#else
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#define TMODULO(t,q,u) \
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do { \
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q = ((t < 0) ? ceil(t / u) : floor(t / u)); \
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if (q != 0) t -= rint(q * u); \
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} while(0)
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#endif
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/*
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* Date/time validation
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* Include check for leap year.
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*/
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extern int day_tab[2][13];
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#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
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/* Julian date support for date2j() and j2date()
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*
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* IS_VALID_JULIAN checks the minimum date exactly, but is a bit sloppy
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* about the maximum, since it's far enough out to not be especially
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* interesting.
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*/
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#define JULIAN_MINYEAR (-4713)
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#define JULIAN_MINMONTH (11)
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#define JULIAN_MINDAY (24)
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#define JULIAN_MAXYEAR (5874898)
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#define IS_VALID_JULIAN(y,m,d) ((((y) > JULIAN_MINYEAR) \
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|| (((y) == JULIAN_MINYEAR) && (((m) > JULIAN_MINMONTH) \
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|| (((m) == JULIAN_MINMONTH) && ((d) >= JULIAN_MINDAY))))) \
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&& ((y) < JULIAN_MAXYEAR))
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/* Julian-date equivalents of Day 0 in Unix and Postgres reckoning */
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#define UNIX_EPOCH_JDATE 2440588 /* == date2j(1970, 1, 1) */
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#define POSTGRES_EPOCH_JDATE 2451545 /* == date2j(2000, 1, 1) */
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/*
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* Info about limits of the Unix time_t data type. We assume that time_t
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* is a signed int32 with origin 1970-01-01. Note this is only relevant
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* when we use the C library's time routines for timezone processing.
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*/
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#define UTIME_MINYEAR (1901)
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#define UTIME_MINMONTH (12)
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#define UTIME_MINDAY (14)
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#define UTIME_MAXYEAR (2038)
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#define UTIME_MAXMONTH (01)
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#define UTIME_MAXDAY (18)
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#define IS_VALID_UTIME(y,m,d) ((((y) > UTIME_MINYEAR) \
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|| (((y) == UTIME_MINYEAR) && (((m) > UTIME_MINMONTH) \
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|| (((m) == UTIME_MINMONTH) && ((d) >= UTIME_MINDAY))))) \
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&& (((y) < UTIME_MAXYEAR) \
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|| (((y) == UTIME_MAXYEAR) && (((m) < UTIME_MAXMONTH) \
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|| (((m) == UTIME_MAXMONTH) && ((d) <= UTIME_MAXDAY))))))
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/*
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* Datetime input parsing routines (ParseDateTime, DecodeDateTime, etc)
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* return zero or a positive value on success. On failure, they return
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* one of these negative code values. DateTimeParseError may be used to
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* produce a correct ereport.
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*/
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#define DTERR_BAD_FORMAT (-1)
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#define DTERR_FIELD_OVERFLOW (-2)
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#define DTERR_MD_FIELD_OVERFLOW (-3) /* triggers hint about DateStyle */
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#define DTERR_INTERVAL_OVERFLOW (-4)
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#define DTERR_TZDISP_OVERFLOW (-5)
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extern void GetCurrentDateTime(struct pg_tm * tm);
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extern void GetCurrentTimeUsec(struct pg_tm * tm, fsec_t *fsec, int *tzp);
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extern void j2date(int jd, int *year, int *month, int *day);
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extern int date2j(int year, int month, int day);
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extern int ParseDateTime(const char *timestr, char *lowstr,
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char **field, int *ftype,
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int maxfields, int *numfields);
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extern int DecodeDateTime(char **field, int *ftype,
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int nf, int *dtype,
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struct pg_tm * tm, fsec_t *fsec, int *tzp);
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extern int DecodeTimeOnly(char **field, int *ftype,
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int nf, int *dtype,
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struct pg_tm * tm, fsec_t *fsec, int *tzp);
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extern int DecodeInterval(char **field, int *ftype,
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int nf, int *dtype,
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struct pg_tm * tm, fsec_t *fsec);
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extern void DateTimeParseError(int dterr, const char *str,
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const char *datatype);
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extern int DetermineLocalTimeZone(struct pg_tm * tm);
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extern int EncodeDateOnly(struct pg_tm * tm, int style, char *str);
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extern int EncodeTimeOnly(struct pg_tm * tm, fsec_t fsec, int *tzp, int style, char *str);
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extern int EncodeDateTime(struct pg_tm * tm, fsec_t fsec, int *tzp, char **tzn, int style, char *str);
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extern int EncodeInterval(struct pg_tm * tm, fsec_t fsec, int style, char *str);
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extern int DecodeSpecial(int field, char *lowtoken, int *val);
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extern int DecodeUnits(int field, char *lowtoken, int *val);
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extern int j2day(int jd);
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extern bool CheckDateTokenTables(void);
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#endif /* DATETIME_H */
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