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/*-------------------------------------------------------------------------
*
* datetime.c
* implements DATE and TIME data types specified in SQL-92 standard
*
* Copyright (c) 1994-5, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/datetime.c,v 1.32 1999/04/26 04:42:48 ishii Exp $
*
*-------------------------------------------------------------------------
*/
#include <stdio.h> /* for sprintf() */
#include <string.h>
#include <limits.h>
#include "postgres.h"
#ifdef HAVE_FLOAT_H
#include <float.h>
#endif
#include "miscadmin.h"
#include "utils/builtins.h"
#include "utils/nabstime.h"
#include "utils/datetime.h"
#include "access/xact.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.
*/
DateADT
date_in(char *str)
{
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 (!PointerIsValid(str))
elog(ERROR, "Bad (null) date external representation", NULL);
#ifdef DATEDEBUG
printf("date_in- input string is %s\n", str);
#endif
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));
return date;
} /* date_in() */
/* date_out()
* Given internal format date, convert to text string.
*/
char *
date_out(DateADT date)
{
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 = palloc(strlen(buf) + 1);
strcpy(result, buf);
return result;
} /* date_out() */
bool
date_eq(DateADT dateVal1, DateADT dateVal2)
{
return dateVal1 == dateVal2;
}
bool
date_ne(DateADT dateVal1, DateADT dateVal2)
{
return dateVal1 != dateVal2;
}
bool
date_lt(DateADT dateVal1, DateADT dateVal2)
{
return dateVal1 < dateVal2;
} /* date_lt() */
bool
date_le(DateADT dateVal1, DateADT dateVal2)
{
return dateVal1 <= dateVal2;
} /* date_le() */
bool
date_gt(DateADT dateVal1, DateADT dateVal2)
{
return dateVal1 > dateVal2;
} /* date_gt() */
bool
date_ge(DateADT dateVal1, DateADT dateVal2)
{
return dateVal1 >= dateVal2;
} /* date_ge() */
int
date_cmp(DateADT dateVal1, DateADT dateVal2)
{
if (dateVal1 < dateVal2)
return -1;
else if (dateVal1 > dateVal2)
return 1;
return 0;
} /* date_cmp() */
DateADT
date_larger(DateADT dateVal1, DateADT dateVal2)
{
return date_gt(dateVal1, dateVal2) ? dateVal1 : dateVal2;
} /* date_larger() */
DateADT
date_smaller(DateADT dateVal1, DateADT dateVal2)
{
return date_lt(dateVal1, dateVal2) ? dateVal1 : dateVal2;
} /* date_smaller() */
/* Compute difference between two dates in days.
*/
int4
date_mi(DateADT dateVal1, DateADT dateVal2)
{
return dateVal1 - dateVal2;
} /* date_mi() */
/* Add a number of days to a date, giving a new date.
* Must handle both positive and negative numbers of days.
*/
DateADT
date_pli(DateADT dateVal, int4 days)
{
return dateVal + days;
} /* date_pli() */
/* Subtract a number of days from a date, giving a new date.
*/
DateADT
date_mii(DateADT dateVal, int4 days)
{
return date_pli(dateVal, -days);
} /* date_mii() */
/* date_datetime()
* Convert date to datetime data type.
*/
DateTime *
date_datetime(DateADT dateVal)
{
DateTime *result;
struct tm tt,
*tm = &tt;
int tz;
double fsec = 0;
char *tzn;
result = palloc(sizeof(DateTime));
if (date2tm(dateVal, &tz, tm, &fsec, &tzn) != 0)
elog(ERROR, "Unable to convert date to datetime", NULL);
#ifdef DATEDEBUG
printf("date_datetime- date is %d.%02d.%02d\n", tm->tm_year, tm->tm_mon, tm->tm_mday);
printf("date_datetime- time is %02d:%02d:%02d %.7f\n", tm->tm_hour, tm->tm_min, tm->tm_sec, fsec);
#endif
if (tm2datetime(tm, fsec, &tz, result) != 0)
elog(ERROR, "Datetime out of range", NULL);
return result;
} /* date_datetime() */
/* datetime_date()
* Convert datetime to date data type.
*/
DateADT
datetime_date(DateTime *datetime)
{
DateADT result;
struct tm tt,
*tm = &tt;
int tz;
double fsec;
char *tzn;
if (!PointerIsValid(datetime))
elog(ERROR, "Unable to convert null datetime to date", NULL);
if (DATETIME_NOT_FINITE(*datetime))
elog(ERROR, "Unable to convert datetime to date", NULL);
if (DATETIME_IS_EPOCH(*datetime))
{
datetime2tm(SetDateTime(*datetime), NULL, tm, &fsec, NULL);
}
else if (DATETIME_IS_CURRENT(*datetime))
{
datetime2tm(SetDateTime(*datetime), &tz, tm, &fsec, &tzn);
}
else
{
if (datetime2tm(*datetime, &tz, tm, &fsec, &tzn) != 0)
elog(ERROR, "Unable to convert datetime to date", NULL);
}
result = (date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - date2j(2000, 1, 1));
return result;
} /* datetime_date() */
/* abstime_date()
* Convert abstime to date data type.
*/
DateADT
abstime_date(AbsoluteTime abstime)
{
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", NULL);
/*
* 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;
}
return result;
} /* abstime_date() */
/* 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);
#ifdef DATEDEBUG
#if defined(HAVE_TM_ZONE)
printf("date2tm- (localtime) %d.%02d.%02d %02d:%02d:%02.0f %s dst=%d\n",
tx->tm_year, tx->tm_mon, tx->tm_mday, tx->tm_hour, tx->tm_min, (double) tm->tm_sec,
tx->tm_zone, tx->tm_isdst);
#elif defined(HAVE_INT_TIMEZONE)
printf("date2tm- (localtime) %d.%02d.%02d %02d:%02d:%02.0f %s %s dst=%d\n",
tx->tm_year, tx->tm_mon, tx->tm_mday, tx->tm_hour, tx->tm_min, (double) tm->tm_sec,
tzname[0], tzname[1], tx->tm_isdst);
#endif
#endif
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
{
#ifdef DATEDEBUG
printf("date2tm- convert %d-%d-%d %d:%d%d to datetime\n",
tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec);
#endif
*tzp = 0;
tm->tm_isdst = 0;
if (tzn != NULL)
*tzn = NULL;
}
#ifdef DATEDEBUG
#if defined(HAVE_TM_ZONE)
printf("date2tm- %d.%02d.%02d %02d:%02d:%02.0f (%d %s) dst=%d\n",
tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min, (double) tm->tm_sec,
*tzp, tm->tm_zone, tm->tm_isdst);
#elif defined(HAVE_INT_TIMEZONE)
printf("date2tm- %d.%02d.%02d %02d:%02d:%02.0f (%d %s %s) dst=%d\n",
tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min, (double) tm->tm_sec,
*tzp, tzname[0], tzname[1], tm->tm_isdst);
#endif
#endif
return 0;
} /* date2tm() */
/*****************************************************************************
* Time ADT
*****************************************************************************/
TimeADT *
time_in(char *str)
{
TimeADT *time;
double fsec;
struct tm tt,
*tm = &tt;
int nf;
char lowstr[MAXDATELEN + 1];
char *field[MAXDATEFIELDS];
int dtype;
int ftype[MAXDATEFIELDS];
if (!PointerIsValid(str))
elog(ERROR, "Bad (null) time external representation", NULL);
if ((ParseDateTime(str, lowstr, field, ftype, MAXDATEFIELDS, &nf) != 0)
|| (DecodeTimeOnly(field, ftype, nf, &dtype, tm, &fsec) != 0))
elog(ERROR, "Bad time external representation '%s'", str);
time = palloc(sizeof(TimeADT));
*time = ((((tm->tm_hour * 60) + tm->tm_min) * 60) + tm->tm_sec + fsec);
return time;
} /* time_in() */
char *
time_out(TimeADT *time)
{
char *result;
struct tm tt,
*tm = &tt;
double fsec;
char buf[MAXDATELEN + 1];
if (!PointerIsValid(time))
return NULL;
tm->tm_hour = (*time / (60 * 60));
tm->tm_min = (((int) (*time / 60)) % 60);
tm->tm_sec = (((int) *time) % 60);
fsec = 0;
EncodeTimeOnly(tm, fsec, DateStyle, buf);
result = palloc(strlen(buf) + 1);
strcpy(result, buf);
return result;
} /* time_out() */
bool
time_eq(TimeADT *time1, TimeADT *time2)
{
if (!PointerIsValid(time1) || !PointerIsValid(time2))
return FALSE;
return *time1 == *time2;
} /* time_eq() */
bool
time_ne(TimeADT *time1, TimeADT *time2)
{
if (!PointerIsValid(time1) || !PointerIsValid(time2))
return FALSE;
return *time1 != *time2;
} /* time_eq() */
bool
time_lt(TimeADT *time1, TimeADT *time2)
{
if (!PointerIsValid(time1) || !PointerIsValid(time2))
return FALSE;
return *time1 < *time2;
} /* time_eq() */
bool
time_le(TimeADT *time1, TimeADT *time2)
{
if (!PointerIsValid(time1) || !PointerIsValid(time2))
return FALSE;
return *time1 <= *time2;
} /* time_eq() */
bool
time_gt(TimeADT *time1, TimeADT *time2)
{
if (!PointerIsValid(time1) || !PointerIsValid(time2))
return FALSE;
return *time1 > *time2;
} /* time_eq() */
bool
time_ge(TimeADT *time1, TimeADT *time2)
{
if (!PointerIsValid(time1) || !PointerIsValid(time2))
return FALSE;
return *time1 >= *time2;
} /* time_eq() */
int
time_cmp(TimeADT *time1, TimeADT *time2)
{
return (*time1 < *time2) ? -1 : (((*time1 > *time2) ? 1 : 0));
} /* time_cmp() */
/* datetime_time()
* Convert datetime to time data type.
*/
TimeADT *
datetime_time(DateTime *datetime)
{
TimeADT *result;
struct tm tt,
*tm = &tt;
int tz;
double fsec;
char *tzn;
if (!PointerIsValid(datetime))
elog(ERROR, "Unable to convert null datetime to date", NULL);
if (DATETIME_NOT_FINITE(*datetime))
elog(ERROR, "Unable to convert datetime to date", NULL);
if (DATETIME_IS_EPOCH(*datetime))
{
datetime2tm(SetDateTime(*datetime), NULL, tm, &fsec, NULL);
}
else if (DATETIME_IS_CURRENT(*datetime))
{
datetime2tm(SetDateTime(*datetime), &tz, tm, &fsec, &tzn);
}
else
{
if (datetime2tm(*datetime, &tz, tm, &fsec, &tzn) != 0)
elog(ERROR, "Unable to convert datetime to date", NULL);
}
result = palloc(sizeof(TimeADT));
*result = ((((tm->tm_hour * 60) + tm->tm_min) * 60) + tm->tm_sec + fsec);
return result;
} /* datetime_time() */
/* datetime_datetime()
* Convert date and time to datetime data type.
*/
DateTime *
datetime_datetime(DateADT date, TimeADT *time)
{
DateTime *result;
if (!PointerIsValid(time))
{
result = palloc(sizeof(DateTime));
DATETIME_INVALID(*result);
}
else
{
result = date_datetime(date);
*result += *time;
}
return result;
} /* datetime_datetime() */
int32 /* RelativeTime */
int4reltime(int32 timevalue)
{
return timevalue;
}