date.h

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/*-------------------------------------------------------------------------
 *
 * date.h
 *    Definitions for the SQL "date" and "time" types.
 *
 *
 * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/utils/date.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef DATE_H
#define DATE_H

#include <math.h>

#include "datatype/timestamp.h"
#include "fmgr.h"
#include "pgtime.h"

typedef int32 DateADT;

typedef int64 TimeADT;

typedef struct
{
    TimeADT     time;           /* all time units other than months and years */
    int32       zone;           /* numeric time zone, in seconds */
} TimeTzADT;

/*
 * Infinity and minus infinity must be the max and min values of DateADT.
 */
#define DATEVAL_NOBEGIN     ((DateADT) PG_INT32_MIN)
#define DATEVAL_NOEND       ((DateADT) PG_INT32_MAX)

#define DATE_NOBEGIN(j)     ((j) = DATEVAL_NOBEGIN)
#define DATE_IS_NOBEGIN(j)  ((j) == DATEVAL_NOBEGIN)
#define DATE_NOEND(j)       ((j) = DATEVAL_NOEND)
#define DATE_IS_NOEND(j)    ((j) == DATEVAL_NOEND)
#define DATE_NOT_FINITE(j)  (DATE_IS_NOBEGIN(j) || DATE_IS_NOEND(j))

/*
 * Macros for fmgr-callable functions.
 *
 * For TimeADT, we make use of the same support routines as for int64.
 * Therefore TimeADT is pass-by-reference if and only if int64 is!
 */
#define MAX_TIME_PRECISION 6

#define DatumGetDateADT(X)    ((DateADT) DatumGetInt32(X))
#define DatumGetTimeADT(X)    ((TimeADT) DatumGetInt64(X))
#define DatumGetTimeTzADTP(X) ((TimeTzADT *) DatumGetPointer(X))

#define DateADTGetDatum(X)    Int32GetDatum(X)
#define TimeADTGetDatum(X)    Int64GetDatum(X)
#define TimeTzADTPGetDatum(X) PointerGetDatum(X)

#define PG_GETARG_DATEADT(n)     DatumGetDateADT(PG_GETARG_DATUM(n))
#define PG_GETARG_TIMEADT(n)     DatumGetTimeADT(PG_GETARG_DATUM(n))
#define PG_GETARG_TIMETZADT_P(n) DatumGetTimeTzADTP(PG_GETARG_DATUM(n))

#define PG_RETURN_DATEADT(x)     return DateADTGetDatum(x)
#define PG_RETURN_TIMEADT(x)     return TimeADTGetDatum(x)
#define PG_RETURN_TIMETZADT_P(x) return TimeTzADTPGetDatum(x)


/* date.c */
extern int32 anytime_typmod_check(bool istz, int32 typmod);
extern double date2timestamp_no_overflow(DateADT dateVal);
extern Timestamp date2timestamp_opt_overflow(DateADT dateVal, int *overflow);
extern TimestampTz date2timestamptz_opt_overflow(DateADT dateVal, int *overflow);
extern void EncodeSpecialDate(DateADT dt, char *str);
extern DateADT GetSQLCurrentDate(void);
extern TimeTzADT *GetSQLCurrentTime(int32 typmod);
extern TimeADT GetSQLLocalTime(int32 typmod);
extern int  time2tm(TimeADT time, struct pg_tm *tm, fsec_t *fsec);
extern int  timetz2tm(TimeTzADT *time, struct pg_tm *tm, fsec_t *fsec, int *tzp);
extern int  tm2time(struct pg_tm *tm, fsec_t fsec, TimeADT *result);
extern int  tm2timetz(struct pg_tm *tm, fsec_t fsec, int tz, TimeTzADT *result);
extern void AdjustTimeForTypmod(TimeADT *time, int32 typmod);

#endif                          /* DATE_H */