/*------------------------------------------------------------------------- * * 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 1.5 2000/06/08 22:37:58 momjian Exp $ * *------------------------------------------------------------------------- */ #ifndef TIMESTAMP_H #define TIMESTAMP_H #include #include #include /* * 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) do {j = DT_INVALID;} while (0) #ifdef NAN #define TIMESTAMP_IS_INVALID(j) (isnan(j)) #else #define TIMESTAMP_IS_INVALID(j) (j == DT_INVALID) #endif #define TIMESTAMP_NOBEGIN(j) do {j = DT_NOBEGIN;} while (0) #define TIMESTAMP_IS_NOBEGIN(j) (j == DT_NOBEGIN) #define TIMESTAMP_NOEND(j) do {j = DT_NOEND;} while (0) #define TIMESTAMP_IS_NOEND(j) (j == DT_NOEND) #define TIMESTAMP_CURRENT(j) do {j = DT_CURRENT;} while (0) #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) do {j = DT_EPOCH;} while (0) #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) do {(j).time = DT_INVALID;} while (0) #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_mul(Interval *span1, float8 *factor); extern Interval *mul_d_interval(float8 *factor, Interval *span1); extern Interval *interval_div(Interval *span1, float8 *factor); 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 *now(void); #endif /* TIMESTAMP_H */