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timestamp.c
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timestamp.c
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/*-------------------------------------------------------------------------
*
* timestamp.c
* Functions for the built-in SQL types "timestamp" and "interval".
*
* Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/backend/utils/adt/timestamp.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <ctype.h>
#include <math.h>
#include <limits.h>
#include <sys/time.h>
#include "access/xact.h"
#include "catalog/pg_type.h"
#include "common/int.h"
#include "common/int128.h"
#include "funcapi.h"
#include "libpq/pqformat.h"
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "nodes/supportnodes.h"
#include "parser/scansup.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "utils/date.h"
#include "utils/datetime.h"
#include "utils/float.h"
#include "utils/numeric.h"
#include "utils/sortsupport.h"
/*
* gcc's -ffast-math switch breaks routines that expect exact results from
* expressions like timeval / SECS_PER_HOUR, where timeval is double.
*/
#ifdef __FAST_MATH__
#error -ffast-math is known to break this code
#endif
#define SAMESIGN(a,b) (((a) < 0) == ((b) < 0))
/* Set at postmaster start */
TimestampTz PgStartTime;
/* Set at configuration reload */
TimestampTz PgReloadTime;
typedef struct
{
Timestamp current;
Timestamp finish;
Interval step;
int step_sign;
} generate_series_timestamp_fctx;
typedef struct
{
TimestampTz current;
TimestampTz finish;
Interval step;
int step_sign;
pg_tz *attimezone;
} generate_series_timestamptz_fctx;
/*
* The transition datatype for interval aggregates is declared as internal.
* It's a pointer to an IntervalAggState allocated in the aggregate context.
*/
typedef struct IntervalAggState
{
int64 N; /* count of finite intervals processed */
Interval sumX; /* sum of finite intervals processed */
/* These counts are *not* included in N! Use IA_TOTAL_COUNT() as needed */
int64 pInfcount; /* count of +infinity intervals */
int64 nInfcount; /* count of -infinity intervals */
} IntervalAggState;
#define IA_TOTAL_COUNT(ia) \
((ia)->N + (ia)->pInfcount + (ia)->nInfcount)
static TimeOffset time2t(const int hour, const int min, const int sec, const fsec_t fsec);
static Timestamp dt2local(Timestamp dt, int timezone);
static bool AdjustIntervalForTypmod(Interval *interval, int32 typmod,
Node *escontext);
static TimestampTz timestamp2timestamptz(Timestamp timestamp);
static Timestamp timestamptz2timestamp(TimestampTz timestamp);
static void EncodeSpecialInterval(const Interval *interval, char *str);
static void interval_um_internal(const Interval *interval, Interval *result);
/* common code for timestamptypmodin and timestamptztypmodin */
static int32
anytimestamp_typmodin(bool istz, ArrayType *ta)
{
int32 *tl;
int n;
tl = ArrayGetIntegerTypmods(ta, &n);
/*
* we're not too tense about good error message here because grammar
* shouldn't allow wrong number of modifiers for TIMESTAMP
*/
if (n != 1)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("invalid type modifier")));
return anytimestamp_typmod_check(istz, tl[0]);
}
/* exported so parse_expr.c can use it */
int32
anytimestamp_typmod_check(bool istz, int32 typmod)
{
if (typmod < 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("TIMESTAMP(%d)%s precision must not be negative",
typmod, (istz ? " WITH TIME ZONE" : ""))));
if (typmod > MAX_TIMESTAMP_PRECISION)
{
ereport(WARNING,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("TIMESTAMP(%d)%s precision reduced to maximum allowed, %d",
typmod, (istz ? " WITH TIME ZONE" : ""),
MAX_TIMESTAMP_PRECISION)));
typmod = MAX_TIMESTAMP_PRECISION;
}
return typmod;
}
/* common code for timestamptypmodout and timestamptztypmodout */
static char *
anytimestamp_typmodout(bool istz, int32 typmod)
{
const char *tz = istz ? " with time zone" : " without time zone";
if (typmod >= 0)
return psprintf("(%d)%s", (int) typmod, tz);
else
return pstrdup(tz);
}
/*****************************************************************************
* USER I/O ROUTINES *
*****************************************************************************/
/* timestamp_in()
* Convert a string to internal form.
*/
Datum
timestamp_in(PG_FUNCTION_ARGS)
{
char *str = PG_GETARG_CSTRING(0);
#ifdef NOT_USED
Oid typelem = PG_GETARG_OID(1);
#endif
int32 typmod = PG_GETARG_INT32(2);
Node *escontext = fcinfo->context;
Timestamp result;
fsec_t fsec;
struct pg_tm tt,
*tm = &tt;
int tz;
int dtype;
int nf;
int dterr;
char *field[MAXDATEFIELDS];
int ftype[MAXDATEFIELDS];
char workbuf[MAXDATELEN + MAXDATEFIELDS];
DateTimeErrorExtra extra;
dterr = ParseDateTime(str, workbuf, sizeof(workbuf),
field, ftype, MAXDATEFIELDS, &nf);
if (dterr == 0)
dterr = DecodeDateTime(field, ftype, nf,
&dtype, tm, &fsec, &tz, &extra);
if (dterr != 0)
{
DateTimeParseError(dterr, &extra, str, "timestamp", escontext);
PG_RETURN_NULL();
}
switch (dtype)
{
case DTK_DATE:
if (tm2timestamp(tm, fsec, NULL, &result) != 0)
ereturn(escontext, (Datum) 0,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("timestamp out of range: \"%s\"", str)));
break;
case DTK_EPOCH:
result = SetEpochTimestamp();
break;
case DTK_LATE:
TIMESTAMP_NOEND(result);
break;
case DTK_EARLY:
TIMESTAMP_NOBEGIN(result);
break;
default:
elog(ERROR, "unexpected dtype %d while parsing timestamp \"%s\"",
dtype, str);
TIMESTAMP_NOEND(result);
}
AdjustTimestampForTypmod(&result, typmod, escontext);
PG_RETURN_TIMESTAMP(result);
}
/* timestamp_out()
* Convert a timestamp to external form.
*/
Datum
timestamp_out(PG_FUNCTION_ARGS)
{
Timestamp timestamp = PG_GETARG_TIMESTAMP(0);
char *result;
struct pg_tm tt,
*tm = &tt;
fsec_t fsec;
char buf[MAXDATELEN + 1];
if (TIMESTAMP_NOT_FINITE(timestamp))
EncodeSpecialTimestamp(timestamp, buf);
else if (timestamp2tm(timestamp, NULL, tm, &fsec, NULL, NULL) == 0)
EncodeDateTime(tm, fsec, false, 0, NULL, DateStyle, buf);
else
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("timestamp out of range")));
result = pstrdup(buf);
PG_RETURN_CSTRING(result);
}
/*
* timestamp_recv - converts external binary format to timestamp
*/
Datum
timestamp_recv(PG_FUNCTION_ARGS)
{
StringInfo buf = (StringInfo) PG_GETARG_POINTER(0);
#ifdef NOT_USED
Oid typelem = PG_GETARG_OID(1);
#endif
int32 typmod = PG_GETARG_INT32(2);
Timestamp timestamp;
struct pg_tm tt,
*tm = &tt;
fsec_t fsec;
timestamp = (Timestamp) pq_getmsgint64(buf);
/* range check: see if timestamp_out would like it */
if (TIMESTAMP_NOT_FINITE(timestamp))
/* ok */ ;
else if (timestamp2tm(timestamp, NULL, tm, &fsec, NULL, NULL) != 0 ||
!IS_VALID_TIMESTAMP(timestamp))
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("timestamp out of range")));
AdjustTimestampForTypmod(×tamp, typmod, NULL);
PG_RETURN_TIMESTAMP(timestamp);
}
/*
* timestamp_send - converts timestamp to binary format
*/
Datum
timestamp_send(PG_FUNCTION_ARGS)
{
Timestamp timestamp = PG_GETARG_TIMESTAMP(0);
StringInfoData buf;
pq_begintypsend(&buf);
pq_sendint64(&buf, timestamp);
PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}
Datum
timestamptypmodin(PG_FUNCTION_ARGS)
{
ArrayType *ta = PG_GETARG_ARRAYTYPE_P(0);
PG_RETURN_INT32(anytimestamp_typmodin(false, ta));
}
Datum
timestamptypmodout(PG_FUNCTION_ARGS)
{
int32 typmod = PG_GETARG_INT32(0);
PG_RETURN_CSTRING(anytimestamp_typmodout(false, typmod));
}
/*
* timestamp_support()
*
* Planner support function for the timestamp_scale() and timestamptz_scale()
* length coercion functions (we need not distinguish them here).
*/
Datum
timestamp_support(PG_FUNCTION_ARGS)
{
Node *rawreq = (Node *) PG_GETARG_POINTER(0);
Node *ret = NULL;
if (IsA(rawreq, SupportRequestSimplify))
{
SupportRequestSimplify *req = (SupportRequestSimplify *) rawreq;
ret = TemporalSimplify(MAX_TIMESTAMP_PRECISION, (Node *) req->fcall);
}
PG_RETURN_POINTER(ret);
}
/* timestamp_scale()
* Adjust time type for specified scale factor.
* Used by PostgreSQL type system to stuff columns.
*/
Datum
timestamp_scale(PG_FUNCTION_ARGS)
{
Timestamp timestamp = PG_GETARG_TIMESTAMP(0);
int32 typmod = PG_GETARG_INT32(1);
Timestamp result;
result = timestamp;
AdjustTimestampForTypmod(&result, typmod, NULL);
PG_RETURN_TIMESTAMP(result);
}
/*
* AdjustTimestampForTypmod --- round off a timestamp to suit given typmod
* Works for either timestamp or timestamptz.
*
* Returns true on success, false on failure (if escontext points to an
* ErrorSaveContext; otherwise errors are thrown).
*/
bool
AdjustTimestampForTypmod(Timestamp *time, int32 typmod, Node *escontext)
{
static const int64 TimestampScales[MAX_TIMESTAMP_PRECISION + 1] = {
INT64CONST(1000000),
INT64CONST(100000),
INT64CONST(10000),
INT64CONST(1000),
INT64CONST(100),
INT64CONST(10),
INT64CONST(1)
};
static const int64 TimestampOffsets[MAX_TIMESTAMP_PRECISION + 1] = {
INT64CONST(500000),
INT64CONST(50000),
INT64CONST(5000),
INT64CONST(500),
INT64CONST(50),
INT64CONST(5),
INT64CONST(0)
};
if (!TIMESTAMP_NOT_FINITE(*time)
&& (typmod != -1) && (typmod != MAX_TIMESTAMP_PRECISION))
{
if (typmod < 0 || typmod > MAX_TIMESTAMP_PRECISION)
ereturn(escontext, false,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("timestamp(%d) precision must be between %d and %d",
typmod, 0, MAX_TIMESTAMP_PRECISION)));
if (*time >= INT64CONST(0))
{
*time = ((*time + TimestampOffsets[typmod]) / TimestampScales[typmod]) *
TimestampScales[typmod];
}
else
{
*time = -((((-*time) + TimestampOffsets[typmod]) / TimestampScales[typmod])
* TimestampScales[typmod]);
}
}
return true;
}
/* timestamptz_in()
* Convert a string to internal form.
*/
Datum
timestamptz_in(PG_FUNCTION_ARGS)
{
char *str = PG_GETARG_CSTRING(0);
#ifdef NOT_USED
Oid typelem = PG_GETARG_OID(1);
#endif
int32 typmod = PG_GETARG_INT32(2);
Node *escontext = fcinfo->context;
TimestampTz result;
fsec_t fsec;
struct pg_tm tt,
*tm = &tt;
int tz;
int dtype;
int nf;
int dterr;
char *field[MAXDATEFIELDS];
int ftype[MAXDATEFIELDS];
char workbuf[MAXDATELEN + MAXDATEFIELDS];
DateTimeErrorExtra extra;
dterr = ParseDateTime(str, workbuf, sizeof(workbuf),
field, ftype, MAXDATEFIELDS, &nf);
if (dterr == 0)
dterr = DecodeDateTime(field, ftype, nf,
&dtype, tm, &fsec, &tz, &extra);
if (dterr != 0)
{
DateTimeParseError(dterr, &extra, str, "timestamp with time zone",
escontext);
PG_RETURN_NULL();
}
switch (dtype)
{
case DTK_DATE:
if (tm2timestamp(tm, fsec, &tz, &result) != 0)
ereturn(escontext, (Datum) 0,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("timestamp out of range: \"%s\"", str)));
break;
case DTK_EPOCH:
result = SetEpochTimestamp();
break;
case DTK_LATE:
TIMESTAMP_NOEND(result);
break;
case DTK_EARLY:
TIMESTAMP_NOBEGIN(result);
break;
default:
elog(ERROR, "unexpected dtype %d while parsing timestamptz \"%s\"",
dtype, str);
TIMESTAMP_NOEND(result);
}
AdjustTimestampForTypmod(&result, typmod, escontext);
PG_RETURN_TIMESTAMPTZ(result);
}
/*
* Try to parse a timezone specification, and return its timezone offset value
* if it's acceptable. Otherwise, an error is thrown.
*
* Note: some code paths update tm->tm_isdst, and some don't; current callers
* don't care, so we don't bother being consistent.
*/
static int
parse_sane_timezone(struct pg_tm *tm, text *zone)
{
char tzname[TZ_STRLEN_MAX + 1];
int dterr;
int tz;
text_to_cstring_buffer(zone, tzname, sizeof(tzname));
/*
* Look up the requested timezone. First we try to interpret it as a
* numeric timezone specification; if DecodeTimezone decides it doesn't
* like the format, we try timezone abbreviations and names.
*
* Note pg_tzset happily parses numeric input that DecodeTimezone would
* reject. To avoid having it accept input that would otherwise be seen
* as invalid, it's enough to disallow having a digit in the first
* position of our input string.
*/
if (isdigit((unsigned char) *tzname))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("invalid input syntax for type %s: \"%s\"",
"numeric time zone", tzname),
errhint("Numeric time zones must have \"-\" or \"+\" as first character.")));
dterr = DecodeTimezone(tzname, &tz);
if (dterr != 0)
{
int type,
val;
pg_tz *tzp;
if (dterr == DTERR_TZDISP_OVERFLOW)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("numeric time zone \"%s\" out of range", tzname)));
else if (dterr != DTERR_BAD_FORMAT)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("time zone \"%s\" not recognized", tzname)));
type = DecodeTimezoneName(tzname, &val, &tzp);
if (type == TZNAME_FIXED_OFFSET)
{
/* fixed-offset abbreviation */
tz = -val;
}
else if (type == TZNAME_DYNTZ)
{
/* dynamic-offset abbreviation, resolve using specified time */
tz = DetermineTimeZoneAbbrevOffset(tm, tzname, tzp);
}
else
{
/* full zone name */
tz = DetermineTimeZoneOffset(tm, tzp);
}
}
return tz;
}
/*
* Look up the requested timezone, returning a pg_tz struct.
*
* This is the same as DecodeTimezoneNameToTz, but starting with a text Datum.
*/
static pg_tz *
lookup_timezone(text *zone)
{
char tzname[TZ_STRLEN_MAX + 1];
text_to_cstring_buffer(zone, tzname, sizeof(tzname));
return DecodeTimezoneNameToTz(tzname);
}
/*
* make_timestamp_internal
* workhorse for make_timestamp and make_timestamptz
*/
static Timestamp
make_timestamp_internal(int year, int month, int day,
int hour, int min, double sec)
{
struct pg_tm tm;
TimeOffset date;
TimeOffset time;
int dterr;
bool bc = false;
Timestamp result;
tm.tm_year = year;
tm.tm_mon = month;
tm.tm_mday = day;
/* Handle negative years as BC */
if (tm.tm_year < 0)
{
bc = true;
tm.tm_year = -tm.tm_year;
}
dterr = ValidateDate(DTK_DATE_M, false, false, bc, &tm);
if (dterr != 0)
ereport(ERROR,
(errcode(ERRCODE_DATETIME_FIELD_OVERFLOW),
errmsg("date field value out of range: %d-%02d-%02d",
year, month, day)));
if (!IS_VALID_JULIAN(tm.tm_year, tm.tm_mon, tm.tm_mday))
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("date out of range: %d-%02d-%02d",
year, month, day)));
date = date2j(tm.tm_year, tm.tm_mon, tm.tm_mday) - POSTGRES_EPOCH_JDATE;
/* Check for time overflow */
if (float_time_overflows(hour, min, sec))
ereport(ERROR,
(errcode(ERRCODE_DATETIME_FIELD_OVERFLOW),
errmsg("time field value out of range: %d:%02d:%02g",
hour, min, sec)));
/* This should match tm2time */
time = (((hour * MINS_PER_HOUR + min) * SECS_PER_MINUTE)
* USECS_PER_SEC) + (int64) rint(sec * USECS_PER_SEC);
result = date * USECS_PER_DAY + time;
/* check for major overflow */
if ((result - time) / USECS_PER_DAY != date)
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("timestamp out of range: %d-%02d-%02d %d:%02d:%02g",
year, month, day,
hour, min, sec)));
/* check for just-barely overflow (okay except time-of-day wraps) */
/* caution: we want to allow 1999-12-31 24:00:00 */
if ((result < 0 && date > 0) ||
(result > 0 && date < -1))
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("timestamp out of range: %d-%02d-%02d %d:%02d:%02g",
year, month, day,
hour, min, sec)));
/* final range check catches just-out-of-range timestamps */
if (!IS_VALID_TIMESTAMP(result))
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("timestamp out of range: %d-%02d-%02d %d:%02d:%02g",
year, month, day,
hour, min, sec)));
return result;
}
/*
* make_timestamp() - timestamp constructor
*/
Datum
make_timestamp(PG_FUNCTION_ARGS)
{
int32 year = PG_GETARG_INT32(0);
int32 month = PG_GETARG_INT32(1);
int32 mday = PG_GETARG_INT32(2);
int32 hour = PG_GETARG_INT32(3);
int32 min = PG_GETARG_INT32(4);
float8 sec = PG_GETARG_FLOAT8(5);
Timestamp result;
result = make_timestamp_internal(year, month, mday,
hour, min, sec);
PG_RETURN_TIMESTAMP(result);
}
/*
* make_timestamptz() - timestamp with time zone constructor
*/
Datum
make_timestamptz(PG_FUNCTION_ARGS)
{
int32 year = PG_GETARG_INT32(0);
int32 month = PG_GETARG_INT32(1);
int32 mday = PG_GETARG_INT32(2);
int32 hour = PG_GETARG_INT32(3);
int32 min = PG_GETARG_INT32(4);
float8 sec = PG_GETARG_FLOAT8(5);
Timestamp result;
result = make_timestamp_internal(year, month, mday,
hour, min, sec);
PG_RETURN_TIMESTAMPTZ(timestamp2timestamptz(result));
}
/*
* Construct a timestamp with time zone.
* As above, but the time zone is specified as seventh argument.
*/
Datum
make_timestamptz_at_timezone(PG_FUNCTION_ARGS)
{
int32 year = PG_GETARG_INT32(0);
int32 month = PG_GETARG_INT32(1);
int32 mday = PG_GETARG_INT32(2);
int32 hour = PG_GETARG_INT32(3);
int32 min = PG_GETARG_INT32(4);
float8 sec = PG_GETARG_FLOAT8(5);
text *zone = PG_GETARG_TEXT_PP(6);
TimestampTz result;
Timestamp timestamp;
struct pg_tm tt;
int tz;
fsec_t fsec;
timestamp = make_timestamp_internal(year, month, mday,
hour, min, sec);
if (timestamp2tm(timestamp, NULL, &tt, &fsec, NULL, NULL) != 0)
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("timestamp out of range")));
tz = parse_sane_timezone(&tt, zone);
result = dt2local(timestamp, -tz);
if (!IS_VALID_TIMESTAMP(result))
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("timestamp out of range")));
PG_RETURN_TIMESTAMPTZ(result);
}
/*
* to_timestamp(double precision)
* Convert UNIX epoch to timestamptz.
*/
Datum
float8_timestamptz(PG_FUNCTION_ARGS)
{
float8 seconds = PG_GETARG_FLOAT8(0);
TimestampTz result;
/* Deal with NaN and infinite inputs ... */
if (isnan(seconds))
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("timestamp cannot be NaN")));
if (isinf(seconds))
{
if (seconds < 0)
TIMESTAMP_NOBEGIN(result);
else
TIMESTAMP_NOEND(result);
}
else
{
/* Out of range? */
if (seconds <
(float8) SECS_PER_DAY * (DATETIME_MIN_JULIAN - UNIX_EPOCH_JDATE)
|| seconds >=
(float8) SECS_PER_DAY * (TIMESTAMP_END_JULIAN - UNIX_EPOCH_JDATE))
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("timestamp out of range: \"%g\"", seconds)));
/* Convert UNIX epoch to Postgres epoch */
seconds -= ((POSTGRES_EPOCH_JDATE - UNIX_EPOCH_JDATE) * SECS_PER_DAY);
seconds = rint(seconds * USECS_PER_SEC);
result = (int64) seconds;
/* Recheck in case roundoff produces something just out of range */
if (!IS_VALID_TIMESTAMP(result))
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("timestamp out of range: \"%g\"",
PG_GETARG_FLOAT8(0))));
}
PG_RETURN_TIMESTAMP(result);
}
/* timestamptz_out()
* Convert a timestamp to external form.
*/
Datum
timestamptz_out(PG_FUNCTION_ARGS)
{
TimestampTz dt = PG_GETARG_TIMESTAMPTZ(0);
char *result;
int tz;
struct pg_tm tt,
*tm = &tt;
fsec_t fsec;
const char *tzn;
char buf[MAXDATELEN + 1];
if (TIMESTAMP_NOT_FINITE(dt))
EncodeSpecialTimestamp(dt, buf);
else if (timestamp2tm(dt, &tz, tm, &fsec, &tzn, NULL) == 0)
EncodeDateTime(tm, fsec, true, tz, tzn, DateStyle, buf);
else
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("timestamp out of range")));
result = pstrdup(buf);
PG_RETURN_CSTRING(result);
}
/*
* timestamptz_recv - converts external binary format to timestamptz
*/
Datum
timestamptz_recv(PG_FUNCTION_ARGS)
{
StringInfo buf = (StringInfo) PG_GETARG_POINTER(0);
#ifdef NOT_USED
Oid typelem = PG_GETARG_OID(1);
#endif
int32 typmod = PG_GETARG_INT32(2);
TimestampTz timestamp;
int tz;
struct pg_tm tt,
*tm = &tt;
fsec_t fsec;
timestamp = (TimestampTz) pq_getmsgint64(buf);
/* range check: see if timestamptz_out would like it */
if (TIMESTAMP_NOT_FINITE(timestamp))
/* ok */ ;
else if (timestamp2tm(timestamp, &tz, tm, &fsec, NULL, NULL) != 0 ||
!IS_VALID_TIMESTAMP(timestamp))
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("timestamp out of range")));
AdjustTimestampForTypmod(×tamp, typmod, NULL);
PG_RETURN_TIMESTAMPTZ(timestamp);
}
/*
* timestamptz_send - converts timestamptz to binary format
*/
Datum
timestamptz_send(PG_FUNCTION_ARGS)
{
TimestampTz timestamp = PG_GETARG_TIMESTAMPTZ(0);
StringInfoData buf;
pq_begintypsend(&buf);
pq_sendint64(&buf, timestamp);
PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}
Datum
timestamptztypmodin(PG_FUNCTION_ARGS)
{
ArrayType *ta = PG_GETARG_ARRAYTYPE_P(0);
PG_RETURN_INT32(anytimestamp_typmodin(true, ta));
}
Datum
timestamptztypmodout(PG_FUNCTION_ARGS)
{
int32 typmod = PG_GETARG_INT32(0);
PG_RETURN_CSTRING(anytimestamp_typmodout(true, typmod));
}
/* timestamptz_scale()
* Adjust time type for specified scale factor.
* Used by PostgreSQL type system to stuff columns.
*/
Datum
timestamptz_scale(PG_FUNCTION_ARGS)
{
TimestampTz timestamp = PG_GETARG_TIMESTAMPTZ(0);
int32 typmod = PG_GETARG_INT32(1);
TimestampTz result;
result = timestamp;
AdjustTimestampForTypmod(&result, typmod, NULL);
PG_RETURN_TIMESTAMPTZ(result);
}
/* interval_in()
* Convert a string to internal form.
*
* External format(s):
* Uses the generic date/time parsing and decoding routines.
*/
Datum
interval_in(PG_FUNCTION_ARGS)
{
char *str = PG_GETARG_CSTRING(0);
#ifdef NOT_USED
Oid typelem = PG_GETARG_OID(1);
#endif
int32 typmod = PG_GETARG_INT32(2);
Node *escontext = fcinfo->context;
Interval *result;
struct pg_itm_in tt,
*itm_in = &tt;
int dtype;
int nf;
int range;
int dterr;
char *field[MAXDATEFIELDS];
int ftype[MAXDATEFIELDS];
char workbuf[256];
DateTimeErrorExtra extra;
itm_in->tm_year = 0;
itm_in->tm_mon = 0;
itm_in->tm_mday = 0;
itm_in->tm_usec = 0;
if (typmod >= 0)
range = INTERVAL_RANGE(typmod);
else
range = INTERVAL_FULL_RANGE;
dterr = ParseDateTime(str, workbuf, sizeof(workbuf), field,
ftype, MAXDATEFIELDS, &nf);
if (dterr == 0)
dterr = DecodeInterval(field, ftype, nf, range,
&dtype, itm_in);
/* if those functions think it's a bad format, try ISO8601 style */
if (dterr == DTERR_BAD_FORMAT)
dterr = DecodeISO8601Interval(str,
&dtype, itm_in);
if (dterr != 0)
{
if (dterr == DTERR_FIELD_OVERFLOW)
dterr = DTERR_INTERVAL_OVERFLOW;
DateTimeParseError(dterr, &extra, str, "interval", escontext);
PG_RETURN_NULL();
}
result = (Interval *) palloc(sizeof(Interval));
switch (dtype)
{
case DTK_DELTA:
if (itmin2interval(itm_in, result) != 0)
ereturn(escontext, (Datum) 0,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("interval out of range")));
break;
case DTK_LATE:
INTERVAL_NOEND(result);
break;
case DTK_EARLY:
INTERVAL_NOBEGIN(result);
break;
default:
elog(ERROR, "unexpected dtype %d while parsing interval \"%s\"",
dtype, str);
}
AdjustIntervalForTypmod(result, typmod, escontext);
PG_RETURN_INTERVAL_P(result);
}
/* interval_out()
* Convert a time span to external form.
*/
Datum
interval_out(PG_FUNCTION_ARGS)
{
Interval *span = PG_GETARG_INTERVAL_P(0);
char *result;
struct pg_itm tt,
*itm = &tt;
char buf[MAXDATELEN + 1];
if (INTERVAL_NOT_FINITE(span))
EncodeSpecialInterval(span, buf);
else
{
interval2itm(*span, itm);
EncodeInterval(itm, IntervalStyle, buf);
}
result = pstrdup(buf);
PG_RETURN_CSTRING(result);
}