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postgresql/src/backend/utils/adt/date.c

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/*-------------------------------------------------------------------------
*
* date.c
* implements DATE and TIME data types specified in SQL-92 standard
*
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994-5, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/date.c,v 1.49 2000/07/12 22:59:08 petere Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <limits.h>
#include <time.h>
#include <float.h>
#include "access/hash.h"
#include "miscadmin.h"
#include "utils/date.h"
#include "utils/nabstime.h"
static int date2tm(DateADT dateVal, int *tzp, struct tm * tm,
double *fsec, char **tzn);
/*****************************************************************************
* Date ADT
*****************************************************************************/
/* date_in()
* Given date text string, convert to internal date format.
*/
Datum
date_in(PG_FUNCTION_ARGS)
{
char *str = PG_GETARG_CSTRING(0);
DateADT date;
double fsec;
struct tm tt,
*tm = &tt;
int tzp;
int dtype;
int nf;
char *field[MAXDATEFIELDS];
int ftype[MAXDATEFIELDS];
char lowstr[MAXDATELEN + 1];
if ((ParseDateTime(str, lowstr, field, ftype, MAXDATEFIELDS, &nf) != 0)
|| (DecodeDateTime(field, ftype, nf, &dtype, tm, &fsec, &tzp) != 0))
elog(ERROR, "Bad date external representation '%s'", str);
switch (dtype)
{
case DTK_DATE:
break;
case DTK_CURRENT:
GetCurrentTime(tm);
break;
case DTK_EPOCH:
tm->tm_year = 1970;
tm->tm_mon = 1;
tm->tm_mday = 1;
break;
default:
elog(ERROR, "Unrecognized date external representation '%s'", str);
}
date = (date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - date2j(2000, 1, 1));
PG_RETURN_DATEADT(date);
}
/* date_out()
* Given internal format date, convert to text string.
*/
Datum
date_out(PG_FUNCTION_ARGS)
{
DateADT date = PG_GETARG_DATEADT(0);
char *result;
struct tm tt,
*tm = &tt;
char buf[MAXDATELEN + 1];
j2date((date + date2j(2000, 1, 1)),
&(tm->tm_year), &(tm->tm_mon), &(tm->tm_mday));
EncodeDateOnly(tm, DateStyle, buf);
result = pstrdup(buf);
PG_RETURN_CSTRING(result);
}
Datum
date_eq(PG_FUNCTION_ARGS)
{
DateADT dateVal1 = PG_GETARG_DATEADT(0);
DateADT dateVal2 = PG_GETARG_DATEADT(1);
PG_RETURN_BOOL(dateVal1 == dateVal2);
}
Datum
date_ne(PG_FUNCTION_ARGS)
{
DateADT dateVal1 = PG_GETARG_DATEADT(0);
DateADT dateVal2 = PG_GETARG_DATEADT(1);
PG_RETURN_BOOL(dateVal1 != dateVal2);
}
Datum
date_lt(PG_FUNCTION_ARGS)
{
DateADT dateVal1 = PG_GETARG_DATEADT(0);
DateADT dateVal2 = PG_GETARG_DATEADT(1);
PG_RETURN_BOOL(dateVal1 < dateVal2);
}
Datum
date_le(PG_FUNCTION_ARGS)
{
DateADT dateVal1 = PG_GETARG_DATEADT(0);
DateADT dateVal2 = PG_GETARG_DATEADT(1);
PG_RETURN_BOOL(dateVal1 <= dateVal2);
}
Datum
date_gt(PG_FUNCTION_ARGS)
{
DateADT dateVal1 = PG_GETARG_DATEADT(0);
DateADT dateVal2 = PG_GETARG_DATEADT(1);
PG_RETURN_BOOL(dateVal1 > dateVal2);
}
Datum
date_ge(PG_FUNCTION_ARGS)
{
DateADT dateVal1 = PG_GETARG_DATEADT(0);
DateADT dateVal2 = PG_GETARG_DATEADT(1);
PG_RETURN_BOOL(dateVal1 >= dateVal2);
}
Datum
date_cmp(PG_FUNCTION_ARGS)
{
DateADT dateVal1 = PG_GETARG_DATEADT(0);
DateADT dateVal2 = PG_GETARG_DATEADT(1);
if (dateVal1 < dateVal2)
PG_RETURN_INT32(-1);
else if (dateVal1 > dateVal2)
PG_RETURN_INT32(1);
PG_RETURN_INT32(0);
}
Datum
date_larger(PG_FUNCTION_ARGS)
{
DateADT dateVal1 = PG_GETARG_DATEADT(0);
DateADT dateVal2 = PG_GETARG_DATEADT(1);
PG_RETURN_DATEADT((dateVal1 > dateVal2) ? dateVal1 : dateVal2);
}
Datum
date_smaller(PG_FUNCTION_ARGS)
{
DateADT dateVal1 = PG_GETARG_DATEADT(0);
DateADT dateVal2 = PG_GETARG_DATEADT(1);
PG_RETURN_DATEADT((dateVal1 < dateVal2) ? dateVal1 : dateVal2);
}
/* Compute difference between two dates in days.
*/
Datum
date_mi(PG_FUNCTION_ARGS)
{
DateADT dateVal1 = PG_GETARG_DATEADT(0);
DateADT dateVal2 = PG_GETARG_DATEADT(1);
PG_RETURN_INT32((int32) (dateVal1 - dateVal2));
}
/* Add a number of days to a date, giving a new date.
* Must handle both positive and negative numbers of days.
*/
Datum
date_pli(PG_FUNCTION_ARGS)
{
DateADT dateVal = PG_GETARG_DATEADT(0);
int32 days = PG_GETARG_INT32(1);
PG_RETURN_DATEADT(dateVal + days);
}
/* Subtract a number of days from a date, giving a new date.
*/
Datum
date_mii(PG_FUNCTION_ARGS)
{
DateADT dateVal = PG_GETARG_DATEADT(0);
int32 days = PG_GETARG_INT32(1);
PG_RETURN_DATEADT(dateVal - days);
}
/* date_timestamp()
* Convert date to timestamp data type.
*/
Datum
date_timestamp(PG_FUNCTION_ARGS)
{
DateADT dateVal = PG_GETARG_DATEADT(0);
Timestamp result;
struct tm tt,
*tm = &tt;
int tz;
double fsec = 0;
char *tzn;
if (date2tm(dateVal, &tz, tm, &fsec, &tzn) != 0)
elog(ERROR, "Unable to convert date to timestamp");
if (tm2timestamp(tm, fsec, &tz, &result) != 0)
elog(ERROR, "Timestamp out of range");
PG_RETURN_TIMESTAMP(result);
}
/* timestamp_date()
* Convert timestamp to date data type.
*/
Datum
timestamp_date(PG_FUNCTION_ARGS)
{
Timestamp timestamp = PG_GETARG_TIMESTAMP(0);
DateADT result;
struct tm tt,
*tm = &tt;
int tz;
double fsec;
char *tzn;
if (TIMESTAMP_NOT_FINITE(timestamp))
elog(ERROR, "Unable to convert timestamp to date");
if (TIMESTAMP_IS_EPOCH(timestamp))
{
timestamp2tm(SetTimestamp(timestamp), NULL, tm, &fsec, NULL);
}
else if (TIMESTAMP_IS_CURRENT(timestamp))
{
timestamp2tm(SetTimestamp(timestamp), &tz, tm, &fsec, &tzn);
}
else
{
if (timestamp2tm(timestamp, &tz, tm, &fsec, &tzn) != 0)
elog(ERROR, "Unable to convert timestamp to date");
}
result = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - date2j(2000, 1, 1);
PG_RETURN_DATEADT(result);
}
/* abstime_date()
* Convert abstime to date data type.
*/
Datum
abstime_date(PG_FUNCTION_ARGS)
{
AbsoluteTime abstime = PG_GETARG_ABSOLUTETIME(0);
DateADT result;
struct tm tt,
*tm = &tt;
int tz;
switch (abstime)
{
case INVALID_ABSTIME:
case NOSTART_ABSTIME:
case NOEND_ABSTIME:
elog(ERROR, "Unable to convert reserved abstime value to date");
/*
* pretend to drop through to make compiler think that result
* will be set
*/
case EPOCH_ABSTIME:
result = date2j(1970, 1, 1) - date2j(2000, 1, 1);
break;
case CURRENT_ABSTIME:
GetCurrentTime(tm);
result = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - date2j(2000, 1, 1);
break;
default:
abstime2tm(abstime, &tz, tm, NULL);
result = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - date2j(2000, 1, 1);
break;
}
PG_RETURN_DATEADT(result);
}
/* date2tm()
* Convert date to time structure.
* Note that date is an implicit local time, but the system calls assume
* that everything is GMT. So, convert to GMT, rotate to local time,
* and then convert again to try to get the time zones correct.
*/
static int
date2tm(DateADT dateVal, int *tzp, struct tm * tm, double *fsec, char **tzn)
{
struct tm *tx;
time_t utime;
*fsec = 0;
j2date((dateVal + date2j(2000, 1, 1)), &(tm->tm_year), &(tm->tm_mon), &(tm->tm_mday));
tm->tm_hour = 0;
tm->tm_min = 0;
tm->tm_sec = 0;
tm->tm_isdst = -1;
if (IS_VALID_UTIME(tm->tm_year, tm->tm_mon, tm->tm_mday))
{
/* convert to system time */
utime = ((dateVal + (date2j(2000, 1, 1) - date2j(1970, 1, 1))) * 86400);
/* rotate to noon to get the right day in time zone */
utime += (12 * 60 * 60);
#ifdef USE_POSIX_TIME
tx = localtime(&utime);
tm->tm_year = tx->tm_year + 1900;
tm->tm_mon = tx->tm_mon + 1;
tm->tm_mday = tx->tm_mday;
tm->tm_isdst = tx->tm_isdst;
#if defined(HAVE_TM_ZONE)
tm->tm_gmtoff = tx->tm_gmtoff;
tm->tm_zone = tx->tm_zone;
/* tm_gmtoff is Sun/DEC-ism */
*tzp = -(tm->tm_gmtoff);
if (tzn != NULL)
*tzn = (char *) tm->tm_zone;
#elif defined(HAVE_INT_TIMEZONE)
#ifdef __CYGWIN__
*tzp = (tm->tm_isdst ? (_timezone - 3600) : _timezone);
#else
*tzp = (tm->tm_isdst ? (timezone - 3600) : timezone);
#endif
if (tzn != NULL)
*tzn = tzname[(tm->tm_isdst > 0)];
#else
#error USE_POSIX_TIME is defined but neither HAVE_TM_ZONE or HAVE_INT_TIMEZONE are defined
#endif
#else /* !USE_POSIX_TIME */
*tzp = CTimeZone; /* V7 conventions; don't know timezone? */
if (tzn != NULL)
*tzn = CTZName;
#endif
/* otherwise, outside of timezone range so convert to GMT... */
}
else
{
*tzp = 0;
tm->tm_isdst = 0;
if (tzn != NULL)
*tzn = NULL;
}
return 0;
} /* date2tm() */
/*****************************************************************************
* Time ADT
*****************************************************************************/
Datum
time_in(PG_FUNCTION_ARGS)
{
char *str = PG_GETARG_CSTRING(0);
TimeADT time;
double fsec;
struct tm tt,
*tm = &tt;
int nf;
char lowstr[MAXDATELEN + 1];
char *field[MAXDATEFIELDS];
int dtype;
int ftype[MAXDATEFIELDS];
if ((ParseDateTime(str, lowstr, field, ftype, MAXDATEFIELDS, &nf) != 0)
|| (DecodeTimeOnly(field, ftype, nf, &dtype, tm, &fsec, NULL) != 0))
elog(ERROR, "Bad time external representation '%s'", str);
time = ((((tm->tm_hour * 60) + tm->tm_min) * 60) + tm->tm_sec + fsec);
PG_RETURN_TIMEADT(time);
}
Datum
time_out(PG_FUNCTION_ARGS)
{
TimeADT time = PG_GETARG_TIMEADT(0);
char *result;
struct tm tt,
*tm = &tt;
double fsec;
char buf[MAXDATELEN + 1];
tm->tm_hour = (time / (60 * 60));
tm->tm_min = (((int) (time / 60)) % 60);
tm->tm_sec = (((int) time) % 60);
fsec = 0;
EncodeTimeOnly(tm, fsec, NULL, DateStyle, buf);
result = pstrdup(buf);
PG_RETURN_CSTRING(result);
}
Datum
time_eq(PG_FUNCTION_ARGS)
{
TimeADT time1 = PG_GETARG_TIMEADT(0);
TimeADT time2 = PG_GETARG_TIMEADT(1);
PG_RETURN_BOOL(time1 == time2);
}
Datum
time_ne(PG_FUNCTION_ARGS)
{
TimeADT time1 = PG_GETARG_TIMEADT(0);
TimeADT time2 = PG_GETARG_TIMEADT(1);
PG_RETURN_BOOL(time1 != time2);
}
Datum
time_lt(PG_FUNCTION_ARGS)
{
TimeADT time1 = PG_GETARG_TIMEADT(0);
TimeADT time2 = PG_GETARG_TIMEADT(1);
PG_RETURN_BOOL(time1 < time2);
}
Datum
time_le(PG_FUNCTION_ARGS)
{
TimeADT time1 = PG_GETARG_TIMEADT(0);
TimeADT time2 = PG_GETARG_TIMEADT(1);
PG_RETURN_BOOL(time1 <= time2);
}
Datum
time_gt(PG_FUNCTION_ARGS)
{
TimeADT time1 = PG_GETARG_TIMEADT(0);
TimeADT time2 = PG_GETARG_TIMEADT(1);
PG_RETURN_BOOL(time1 > time2);
}
Datum
time_ge(PG_FUNCTION_ARGS)
{
TimeADT time1 = PG_GETARG_TIMEADT(0);
TimeADT time2 = PG_GETARG_TIMEADT(1);
PG_RETURN_BOOL(time1 >= time2);
}
Datum
time_cmp(PG_FUNCTION_ARGS)
{
TimeADT time1 = PG_GETARG_TIMEADT(0);
TimeADT time2 = PG_GETARG_TIMEADT(1);
if (time1 < time2)
PG_RETURN_INT32(-1);
if (time1 > time2)
PG_RETURN_INT32(1);
PG_RETURN_INT32(0);
}
Datum
time_larger(PG_FUNCTION_ARGS)
{
TimeADT time1 = PG_GETARG_TIMEADT(0);
TimeADT time2 = PG_GETARG_TIMEADT(1);
PG_RETURN_TIMEADT((time1 > time2) ? time1 : time2);
}
Datum
time_smaller(PG_FUNCTION_ARGS)
{
TimeADT time1 = PG_GETARG_TIMEADT(0);
TimeADT time2 = PG_GETARG_TIMEADT(1);
PG_RETURN_TIMEADT((time1 < time2) ? time1 : time2);
}
/* overlaps_time()
* Implements the SQL92 OVERLAPS operator.
* Algorithm from Date and Darwen, 1997
*/
Datum
overlaps_time(PG_FUNCTION_ARGS)
{
TimeADT ts1 = PG_GETARG_TIMEADT(0);
TimeADT te1 = PG_GETARG_TIMEADT(1);
TimeADT ts2 = PG_GETARG_TIMEADT(2);
TimeADT te2 = PG_GETARG_TIMEADT(3);
/* Make sure we have ordered pairs... */
if (ts1 > te1)
{
TimeADT tt = ts1;
ts1 = te1;
te1 = tt;
}
if (ts2 > te2)
{
TimeADT tt = ts2;
ts2 = te2;
te2 = tt;
}
PG_RETURN_BOOL((ts1 > ts2 && (ts1 < te2 || te1 < te2)) ||
(ts1 < ts2 && (ts2 < te1 || te2 < te1)) ||
(ts1 == ts2));
}
/* timestamp_time()
* Convert timestamp to time data type.
*/
Datum
timestamp_time(PG_FUNCTION_ARGS)
{
Timestamp timestamp = PG_GETARG_TIMESTAMP(0);
TimeADT result;
struct tm tt,
*tm = &tt;
int tz;
double fsec;
char *tzn;
if (TIMESTAMP_NOT_FINITE(timestamp))
elog(ERROR, "Unable to convert timestamp to date");
if (TIMESTAMP_IS_EPOCH(timestamp))
timestamp2tm(SetTimestamp(timestamp), NULL, tm, &fsec, NULL);
else if (TIMESTAMP_IS_CURRENT(timestamp))
timestamp2tm(SetTimestamp(timestamp), &tz, tm, &fsec, &tzn);
else
{
if (timestamp2tm(timestamp, &tz, tm, &fsec, &tzn) != 0)
elog(ERROR, "Unable to convert timestamp to date");
}
result = ((((tm->tm_hour * 60) + tm->tm_min) * 60) + tm->tm_sec + fsec);
PG_RETURN_TIMEADT(result);
}
/* datetime_timestamp()
* Convert date and time to timestamp data type.
*/
Datum
datetime_timestamp(PG_FUNCTION_ARGS)
{
DateADT date = PG_GETARG_DATEADT(0);
TimeADT time = PG_GETARG_TIMEADT(1);
Timestamp result;
result = DatumGetTimestamp(DirectFunctionCall1(date_timestamp,
DateADTGetDatum(date)));
result += time;
PG_RETURN_TIMESTAMP(result);
}
/* time_interval()
* Convert time to interval data type.
*/
Datum
time_interval(PG_FUNCTION_ARGS)
{
TimeADT time = PG_GETARG_TIMEADT(0);
Interval *result;
result = (Interval *) palloc(sizeof(Interval));
result->time = time;
result->month = 0;
PG_RETURN_INTERVAL_P(result);
}
/*****************************************************************************
* Time With Time Zone ADT
*****************************************************************************/
Datum
timetz_in(PG_FUNCTION_ARGS)
{
char *str = PG_GETARG_CSTRING(0);
TimeTzADT *time;
double fsec;
struct tm tt,
*tm = &tt;
int tz;
int nf;
char lowstr[MAXDATELEN + 1];
char *field[MAXDATEFIELDS];
int dtype;
int ftype[MAXDATEFIELDS];
if ((ParseDateTime(str, lowstr, field, ftype, MAXDATEFIELDS, &nf) != 0)
|| (DecodeTimeOnly(field, ftype, nf, &dtype, tm, &fsec, &tz) != 0))
elog(ERROR, "Bad time external representation '%s'", str);
time = (TimeTzADT *) palloc(sizeof(TimeTzADT));
time->time = ((((tm->tm_hour * 60) + tm->tm_min) * 60) + tm->tm_sec + fsec);
time->zone = tz;
PG_RETURN_TIMETZADT_P(time);
}
Datum
timetz_out(PG_FUNCTION_ARGS)
{
TimeTzADT *time = PG_GETARG_TIMETZADT_P(0);
char *result;
struct tm tt,
*tm = &tt;
double fsec;
int tz;
char buf[MAXDATELEN + 1];
tm->tm_hour = (time->time / (60 * 60));
tm->tm_min = (((int) (time->time / 60)) % 60);
tm->tm_sec = (((int) time->time) % 60);
fsec = 0;
tz = time->zone;
EncodeTimeOnly(tm, fsec, &tz, DateStyle, buf);
result = pstrdup(buf);
PG_RETURN_CSTRING(result);
}
Datum
timetz_eq(PG_FUNCTION_ARGS)
{
TimeTzADT *time1 = PG_GETARG_TIMETZADT_P(0);
TimeTzADT *time2 = PG_GETARG_TIMETZADT_P(1);
PG_RETURN_BOOL(((time1->time+time1->zone) == (time2->time+time2->zone)));
}
Datum
timetz_ne(PG_FUNCTION_ARGS)
{
TimeTzADT *time1 = PG_GETARG_TIMETZADT_P(0);
TimeTzADT *time2 = PG_GETARG_TIMETZADT_P(1);
PG_RETURN_BOOL(((time1->time+time1->zone) != (time2->time+time2->zone)));
}
Datum
timetz_lt(PG_FUNCTION_ARGS)
{
TimeTzADT *time1 = PG_GETARG_TIMETZADT_P(0);
TimeTzADT *time2 = PG_GETARG_TIMETZADT_P(1);
PG_RETURN_BOOL(((time1->time+time1->zone) < (time2->time+time2->zone)));
}
Datum
timetz_le(PG_FUNCTION_ARGS)
{
TimeTzADT *time1 = PG_GETARG_TIMETZADT_P(0);
TimeTzADT *time2 = PG_GETARG_TIMETZADT_P(1);
PG_RETURN_BOOL(((time1->time+time1->zone) <= (time2->time+time2->zone)));
}
Datum
timetz_gt(PG_FUNCTION_ARGS)
{
TimeTzADT *time1 = PG_GETARG_TIMETZADT_P(0);
TimeTzADT *time2 = PG_GETARG_TIMETZADT_P(1);
PG_RETURN_BOOL(((time1->time+time1->zone) > (time2->time+time2->zone)));
}
Datum
timetz_ge(PG_FUNCTION_ARGS)
{
TimeTzADT *time1 = PG_GETARG_TIMETZADT_P(0);
TimeTzADT *time2 = PG_GETARG_TIMETZADT_P(1);
PG_RETURN_BOOL(((time1->time+time1->zone) >= (time2->time+time2->zone)));
}
Datum
timetz_cmp(PG_FUNCTION_ARGS)
{
TimeTzADT *time1 = PG_GETARG_TIMETZADT_P(0);
TimeTzADT *time2 = PG_GETARG_TIMETZADT_P(1);
if (DatumGetBool(DirectFunctionCall2(timetz_lt,
TimeTzADTPGetDatum(time1),
TimeTzADTPGetDatum(time2))))
PG_RETURN_INT32(-1);
if (DatumGetBool(DirectFunctionCall2(timetz_gt,
TimeTzADTPGetDatum(time1),
TimeTzADTPGetDatum(time2))))
PG_RETURN_INT32(1);
PG_RETURN_INT32(0);
}
/*
* timetz, being an unusual size, needs a specialized hash function.
*/
Datum
timetz_hash(PG_FUNCTION_ARGS)
{
TimeTzADT *key = PG_GETARG_TIMETZADT_P(0);
/*
* Specify hash length as sizeof(double) + sizeof(int4), not as
* sizeof(TimeTzADT), so that any garbage pad bytes in the structure
* won't be included in the hash!
*/
return hash_any((char *) key, sizeof(double) + sizeof(int4));
}
Datum
timetz_larger(PG_FUNCTION_ARGS)
{
TimeTzADT *time1 = PG_GETARG_TIMETZADT_P(0);
TimeTzADT *time2 = PG_GETARG_TIMETZADT_P(1);
if (DatumGetBool(DirectFunctionCall2(timetz_gt,
TimeTzADTPGetDatum(time1),
TimeTzADTPGetDatum(time2))))
PG_RETURN_TIMETZADT_P(time1);
PG_RETURN_TIMETZADT_P(time2);
}
Datum
timetz_smaller(PG_FUNCTION_ARGS)
{
TimeTzADT *time1 = PG_GETARG_TIMETZADT_P(0);
TimeTzADT *time2 = PG_GETARG_TIMETZADT_P(1);
if (DatumGetBool(DirectFunctionCall2(timetz_lt,
TimeTzADTPGetDatum(time1),
TimeTzADTPGetDatum(time2))))
PG_RETURN_TIMETZADT_P(time1);
PG_RETURN_TIMETZADT_P(time2);
}
/* overlaps_timetz()
* Implements the SQL92 OVERLAPS operator.
* Algorithm from Date and Darwen, 1997
*/
Datum
overlaps_timetz(PG_FUNCTION_ARGS)
{
/* The arguments are TimeTzADT *, but we leave them as generic Datums
* for convenience of notation.
*/
Datum ts1 = PG_GETARG_DATUM(0);
Datum te1 = PG_GETARG_DATUM(1);
Datum ts2 = PG_GETARG_DATUM(2);
Datum te2 = PG_GETARG_DATUM(3);
#define TIMETZ_GT(t1,t2) \
DatumGetBool(DirectFunctionCall2(timetz_gt,t1,t2))
#define TIMETZ_LT(t1,t2) \
DatumGetBool(DirectFunctionCall2(timetz_lt,t1,t2))
#define TIMETZ_EQ(t1,t2) \
DatumGetBool(DirectFunctionCall2(timetz_eq,t1,t2))
/* Make sure we have ordered pairs... */
if (TIMETZ_GT(ts1, te1))
{
Datum tt = ts1;
ts1 = te1;
te1 = tt;
}
if (TIMETZ_GT(ts2, te2))
{
Datum tt = ts2;
ts2 = te2;
te2 = tt;
}
PG_RETURN_BOOL((TIMETZ_GT(ts1, ts2) &&
(TIMETZ_LT(ts1, te2) || TIMETZ_LT(te1, te2))) ||
(TIMETZ_GT(ts2, ts1) &&
(TIMETZ_LT(ts2, te1) || TIMETZ_LT(te2, te1))) ||
TIMETZ_EQ(ts1, ts2));
#undef TIMETZ_GT
#undef TIMETZ_LT
#undef TIMETZ_EQ
}
/* timestamp_timetz()
* Convert timestamp to timetz data type.
*/
Datum
timestamp_timetz(PG_FUNCTION_ARGS)
{
Timestamp timestamp = PG_GETARG_TIMESTAMP(0);
TimeTzADT *result;
struct tm tt,
*tm = &tt;
int tz;
double fsec;
char *tzn;
if (TIMESTAMP_NOT_FINITE(timestamp))
elog(ERROR, "Unable to convert timestamp to date");
if (TIMESTAMP_IS_EPOCH(timestamp))
{
timestamp2tm(SetTimestamp(timestamp), NULL, tm, &fsec, NULL);
tz = 0;
}
else if (TIMESTAMP_IS_CURRENT(timestamp))
timestamp2tm(SetTimestamp(timestamp), &tz, tm, &fsec, &tzn);
else
{
if (timestamp2tm(timestamp, &tz, tm, &fsec, &tzn) != 0)
elog(ERROR, "Unable to convert timestamp to date");
}
result = (TimeTzADT *) palloc(sizeof(TimeTzADT));
result->time = ((((tm->tm_hour * 60) + tm->tm_min) * 60) + tm->tm_sec + fsec);
result->zone = tz;
PG_RETURN_TIMETZADT_P(result);
}
/* datetimetz_timestamp()
* Convert date and timetz to timestamp data type.
* Timestamp is stored in GMT, so add the time zone
* stored with the timetz to the result.
* - thomas 2000-03-10
*/
Datum
datetimetz_timestamp(PG_FUNCTION_ARGS)
{
DateADT date = PG_GETARG_DATEADT(0);
TimeTzADT *time = PG_GETARG_TIMETZADT_P(1);
Timestamp result;
struct tm tt,
*tm = &tt;
int tz;
double fsec = 0;
char *tzn;
if (date2tm(date, &tz, tm, &fsec, &tzn) != 0)
elog(ERROR, "Unable to convert date to timestamp");
if (tm2timestamp(tm, fsec, &time->zone, &result) != 0)
elog(ERROR, "Timestamp out of range");
result += time->time;
PG_RETURN_TIMESTAMP(result);
}
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