1 files changed, 90 insertions, 0 deletions
diff --git a/src/include/utils/date.h b/src/include/utils/date.h
new file mode 100644
index 0000000..6fc491e
--- /dev/null
+++ b/src/include/utils/date.h
@@ -0,0 +1,90 @@
+/*-------------------------------------------------------------------------
+ *
+ * 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 int32 date_cmp_timestamp_internal(DateADT dateVal, Timestamp dt2);
+extern int32 date_cmp_timestamptz_internal(DateADT dateVal, TimestampTz dt2);
+
+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 bool time_overflows(int hour, int min, int sec, fsec_t fsec);
+extern bool float_time_overflows(int hour, int min, double sec);
+extern void AdjustTimeForTypmod(TimeADT *time, int32 typmod);
+
+#endif							/* DATE_H */