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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 1.2 2000/03/14 23:06:51 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)
/*
* 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 bool overlaps_timestamp(Timestamp *dt1, Timestamp *dt2, Timestamp *dt3, Timestamp *dt4);
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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