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e39f990467
DecodeInterval (interval input) was careless about integer-overflow hazards, allowing bogus results to be obtained for sufficiently large input values. Also, since it initially converted the input to a "struct tm", it was impossible to produce the full range of representable interval values. Meanwhile, EncodeInterval (interval output) and a few other functions could suffer failures if asked to process sufficiently large interval values, because they also relied on being able to represent an interval in "struct tm" which is not designed to handle that. Fix all this stuff by introducing new struct types that are more fit for purpose. While this is clearly a bug fix, it's also an API break for any code that's calling these functions directly. So back-patching doesn't seem wise, especially in view of the lack of field complaints. Joe Koshakow, editorialized a bit by me Discussion: https://postgr.es/m/CAAvxfHff0JLYHwyBrtMx_=6wr=k2Xp+D+-X3vEhHjJYMj+mQcg@mail.gmail.com
117 lines
4.3 KiB
C
117 lines
4.3 KiB
C
/*-------------------------------------------------------------------------
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*
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* timestamp.h
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* Definitions for the SQL "timestamp" and "interval" types.
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*
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* Portions Copyright (c) 1996-2022, 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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* src/include/utils/timestamp.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef TIMESTAMP_H
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#define TIMESTAMP_H
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#include "datatype/timestamp.h"
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#include "fmgr.h"
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#include "pgtime.h"
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/*
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* Macros for fmgr-callable functions.
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*
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* For Timestamp, we make use of the same support routines as for int64.
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* Therefore Timestamp is pass-by-reference if and only if int64 is!
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*/
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#define DatumGetTimestamp(X) ((Timestamp) DatumGetInt64(X))
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#define DatumGetTimestampTz(X) ((TimestampTz) DatumGetInt64(X))
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#define DatumGetIntervalP(X) ((Interval *) DatumGetPointer(X))
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#define TimestampGetDatum(X) Int64GetDatum(X)
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#define TimestampTzGetDatum(X) Int64GetDatum(X)
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#define IntervalPGetDatum(X) PointerGetDatum(X)
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#define PG_GETARG_TIMESTAMP(n) DatumGetTimestamp(PG_GETARG_DATUM(n))
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#define PG_GETARG_TIMESTAMPTZ(n) DatumGetTimestampTz(PG_GETARG_DATUM(n))
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#define PG_GETARG_INTERVAL_P(n) DatumGetIntervalP(PG_GETARG_DATUM(n))
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#define PG_RETURN_TIMESTAMP(x) return TimestampGetDatum(x)
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#define PG_RETURN_TIMESTAMPTZ(x) return TimestampTzGetDatum(x)
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#define PG_RETURN_INTERVAL_P(x) return IntervalPGetDatum(x)
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#define TIMESTAMP_MASK(b) (1 << (b))
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#define INTERVAL_MASK(b) (1 << (b))
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/* Macros to handle packing and unpacking the typmod field for intervals */
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#define INTERVAL_FULL_RANGE (0x7FFF)
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#define INTERVAL_RANGE_MASK (0x7FFF)
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#define INTERVAL_FULL_PRECISION (0xFFFF)
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#define INTERVAL_PRECISION_MASK (0xFFFF)
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#define INTERVAL_TYPMOD(p,r) ((((r) & INTERVAL_RANGE_MASK) << 16) | ((p) & INTERVAL_PRECISION_MASK))
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#define INTERVAL_PRECISION(t) ((t) & INTERVAL_PRECISION_MASK)
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#define INTERVAL_RANGE(t) (((t) >> 16) & INTERVAL_RANGE_MASK)
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#define TimestampTzPlusMilliseconds(tz,ms) ((tz) + ((ms) * (int64) 1000))
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/* Set at postmaster start */
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extern TimestampTz PgStartTime;
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/* Set at configuration reload */
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extern TimestampTz PgReloadTime;
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/* Internal routines (not fmgr-callable) */
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extern int32 anytimestamp_typmod_check(bool istz, int32 typmod);
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extern TimestampTz GetCurrentTimestamp(void);
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extern TimestampTz GetSQLCurrentTimestamp(int32 typmod);
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extern Timestamp GetSQLLocalTimestamp(int32 typmod);
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extern void TimestampDifference(TimestampTz start_time, TimestampTz stop_time,
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long *secs, int *microsecs);
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extern long TimestampDifferenceMilliseconds(TimestampTz start_time,
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TimestampTz stop_time);
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extern bool TimestampDifferenceExceeds(TimestampTz start_time,
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TimestampTz stop_time,
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int msec);
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extern TimestampTz time_t_to_timestamptz(pg_time_t tm);
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extern pg_time_t timestamptz_to_time_t(TimestampTz t);
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extern const char *timestamptz_to_str(TimestampTz t);
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extern int tm2timestamp(struct pg_tm *tm, fsec_t fsec, int *tzp, Timestamp *dt);
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extern int timestamp2tm(Timestamp dt, int *tzp, struct pg_tm *tm,
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fsec_t *fsec, const char **tzn, pg_tz *attimezone);
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extern void dt2time(Timestamp dt, int *hour, int *min, int *sec, fsec_t *fsec);
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extern void interval2itm(Interval span, struct pg_itm *itm);
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extern int itm2interval(struct pg_itm *itm, Interval *span);
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extern int itmin2interval(struct pg_itm_in *itm_in, Interval *span);
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extern Timestamp SetEpochTimestamp(void);
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extern void GetEpochTime(struct pg_tm *tm);
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extern int timestamp_cmp_internal(Timestamp dt1, Timestamp dt2);
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/* timestamp comparison works for timestamptz also */
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#define timestamptz_cmp_internal(dt1,dt2) timestamp_cmp_internal(dt1, dt2)
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extern TimestampTz timestamp2timestamptz_opt_overflow(Timestamp timestamp,
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int *overflow);
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extern int32 timestamp_cmp_timestamptz_internal(Timestamp timestampVal,
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TimestampTz dt2);
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extern int isoweek2j(int year, int week);
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extern void isoweek2date(int woy, int *year, int *mon, int *mday);
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extern void isoweekdate2date(int isoweek, int wday, int *year, int *mon, int *mday);
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extern int date2isoweek(int year, int mon, int mday);
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extern int date2isoyear(int year, int mon, int mday);
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extern int date2isoyearday(int year, int mon, int mday);
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extern bool TimestampTimestampTzRequiresRewrite(void);
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#endif /* TIMESTAMP_H */
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