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a97683bc6c
postgres/src/backend/utils/adt/dt.c
Thomas G. Lockhart a97683bc6c Change #if FALSE to #if NOT_USED to avoid port problems. 
Fix problem with date_part() for timespan (had an offset of one)
 when given decade, century, and millenium as arguments.
 Reported by Ricardo J.C.Coelho.
1999-02-13 04:25:01 +00:00

4566 lines
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/*-------------------------------------------------------------------------
*
* dt.c--
* Functions for the built-in type "dt".
*
* Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/Attic/dt.c,v 1.63 1999/02/13 04:25:01 thomas Exp $
*
*-------------------------------------------------------------------------
*/
#include <stdio.h>
#include <ctype.h>
#include <math.h>
#include <string.h>
#include <sys/types.h>
#include <errno.h>
#include "postgres.h"
#include "miscadmin.h"
#ifdef HAVE_FLOAT_H
#include <float.h>
#endif
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#ifndef USE_POSIX_TIME
#include <sys/timeb.h>
#endif
#include "utils/builtins.h"
static int DecodeDate(char *str, int fmask, int *tmask, struct tm * tm);
static int DecodeNumber(int flen, char *field,
int fmask, int *tmask, struct tm * tm, double *fsec, int *is2digits);
static int DecodeNumberField(int len, char *str,
int fmask, int *tmask, struct tm * tm, double *fsec, int *is2digits);
static int DecodeSpecial(int field, char *lowtoken, int *val);
static int DecodeTime(char *str, int fmask, int *tmask,
struct tm * tm, double *fsec);
static int DecodeTimezone(char *str, int *tzp);
static int DecodeUnits(int field, char *lowtoken, int *val);
static int EncodeSpecialDateTime(DateTime dt, char *str);
static datetkn *datebsearch(char *key, datetkn *base, unsigned int nel);
static DateTime dt2local(DateTime dt, int timezone);
static void dt2time(DateTime dt, int *hour, int *min, double *sec);
static int j2day(int jd);
static double time2t(const int hour, const int min, const double sec);
static int timespan2tm(TimeSpan span, struct tm * tm, float8 *fsec);
static int tm2timespan(struct tm * tm, double fsec, TimeSpan *span);
#define USE_DATE_CACHE 1
#define ROUND_ALL 0
#if 0
#define isleap(y) (((y % 4) == 0) && (((y % 100) != 0) || ((y % 400) == 0)))
int mdays[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31, 0};
#endif
int day_tab[2][13] = {
{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31, 0},
{31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31, 0}};
char *months[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec", NULL};
char *days[] = {"Sunday", "Monday", "Tuesday", "Wednesday",
"Thursday", "Friday", "Saturday", NULL};
/* TMODULO()
* Macro to replace modf(), which is broken on some platforms.
*/
#define TMODULO(t,q,u) \
do { \
q = ((t < 0)? ceil(t / u): floor(t / u)); \
if (q != 0) \
t -= rint(q * u); \
} while(0)
static void GetEpochTime(struct tm * tm);
#define UTIME_MINYEAR (1901)
#define UTIME_MINMONTH (12)
#define UTIME_MINDAY (14)
#define UTIME_MAXYEAR (2038)
#define UTIME_MAXMONTH (01)
#define UTIME_MAXDAY (18)
#define IS_VALID_UTIME(y,m,d) (((y > UTIME_MINYEAR) \
|| ((y == UTIME_MINYEAR) && ((m > UTIME_MINMONTH) \
|| ((m == UTIME_MINMONTH) && (d >= UTIME_MINDAY))))) \
&& ((y < UTIME_MAXYEAR) \
|| ((y == UTIME_MAXYEAR) && ((m < UTIME_MAXMONTH) \
|| ((m == UTIME_MAXMONTH) && (d <= UTIME_MAXDAY))))))
/*****************************************************************************
* USER I/O ROUTINES *
*****************************************************************************/
/* datetime_in()
* Convert a string to internal form.
*/
DateTime *
datetime_in(char *str)
{
DateTime *result;
double fsec;
struct tm tt,
*tm = &tt;
int tz;
int dtype;
int nf;
char *field[MAXDATEFIELDS];
int ftype[MAXDATEFIELDS];
char lowstr[MAXDATELEN + 1];
if (!PointerIsValid(str))
elog(ERROR, "Bad (null) datetime external representation", NULL);
if ((ParseDateTime(str, lowstr, field, ftype, MAXDATEFIELDS, &nf) != 0)
|| (DecodeDateTime(field, ftype, nf, &dtype, tm, &fsec, &tz) != 0))
elog(ERROR, "Bad datetime external representation '%s'", str);
result = palloc(sizeof(DateTime));
switch (dtype)
{
case DTK_DATE:
if (tm2datetime(tm, fsec, &tz, result) != 0)
elog(ERROR, "Datetime out of range '%s'", str);
#ifdef DATEDEBUG
printf("datetime_in- date is %f\n", *result);
#endif
break;
case DTK_EPOCH:
DATETIME_EPOCH(*result);
break;
case DTK_CURRENT:
DATETIME_CURRENT(*result);
break;
case DTK_LATE:
DATETIME_NOEND(*result);
break;
case DTK_EARLY:
DATETIME_NOBEGIN(*result);
break;
case DTK_INVALID:
DATETIME_INVALID(*result);
break;
default:
elog(ERROR, "Internal coding error, can't input datetime '%s'", str);
}
return result;
} /* datetime_in() */
/* datetime_out()
* Convert a datetime to external form.
*/
char *
datetime_out(DateTime *dt)
{
char *result;
int tz;
struct tm tt,
*tm = &tt;
double fsec;
char *tzn;
char buf[MAXDATELEN + 1];
if (!PointerIsValid(dt))
return NULL;
if (DATETIME_IS_RESERVED(*dt))
{
EncodeSpecialDateTime(*dt, buf);
}
else if (datetime2tm(*dt, &tz, tm, &fsec, &tzn) == 0)
{
EncodeDateTime(tm, fsec, &tz, &tzn, DateStyle, buf);
}
else
EncodeSpecialDateTime(DT_INVALID, buf);
result = palloc(strlen(buf) + 1);
strcpy(result, buf);
return result;
} /* datetime_out() */
/* timespan_in()
* Convert a string to internal form.
*
* External format(s):
* Uses the generic date/time parsing and decoding routines.
*/
TimeSpan *
timespan_in(char *str)
{
TimeSpan *span;
double fsec;
struct tm tt,
*tm = &tt;
int dtype;
int nf;
char *field[MAXDATEFIELDS];
int ftype[MAXDATEFIELDS];
char lowstr[MAXDATELEN + 1];
tm->tm_year = 0;
tm->tm_mon = 0;
tm->tm_mday = 0;
tm->tm_hour = 0;
tm->tm_min = 0;
tm->tm_sec = 0;
fsec = 0;
if (!PointerIsValid(str))
elog(ERROR, "Bad (null) timespan external representation", NULL);
if ((ParseDateTime(str, lowstr, field, ftype, MAXDATEFIELDS, &nf) != 0)
|| (DecodeDateDelta(field, ftype, nf, &dtype, tm, &fsec) != 0))
elog(ERROR, "Bad timespan external representation '%s'", str);
span = palloc(sizeof(TimeSpan));
switch (dtype)
{
case DTK_DELTA:
if (tm2timespan(tm, fsec, span) != 0)
{
#if NOT_USED
TIMESPAN_INVALID(span);
#endif
elog(ERROR, "Bad timespan external representation '%s'", str);
}
break;
default:
elog(ERROR, "Internal coding error, can't input timespan '%s'", str);
}
return span;
} /* timespan_in() */
/* timespan_out()
* Convert a time span to external form.
*/
char *
timespan_out(TimeSpan *span)
{
char *result;
struct tm tt,
*tm = &tt;
double fsec;
char buf[MAXDATELEN + 1];
if (!PointerIsValid(span))
return NULL;
if (timespan2tm(*span, tm, &fsec) != 0)
return NULL;
if (EncodeTimeSpan(tm, fsec, DateStyle, buf) != 0)
elog(ERROR, "Unable to format timespan", NULL);
result = palloc(strlen(buf) + 1);
strcpy(result, buf);
return result;
} /* timespan_out() */
/*****************************************************************************
* PUBLIC ROUTINES *
*****************************************************************************/
bool
datetime_finite(DateTime *datetime)
{
if (!PointerIsValid(datetime))
return FALSE;
return !DATETIME_NOT_FINITE(*datetime);
} /* datetime_finite() */
bool
timespan_finite(TimeSpan *timespan)
{
if (!PointerIsValid(timespan))
return FALSE;
return !TIMESPAN_NOT_FINITE(*timespan);
} /* timespan_finite() */
/*----------------------------------------------------------
* Relational operators for datetime.
*---------------------------------------------------------*/
static void
GetEpochTime(struct tm * tm)
{
struct tm *t0;
time_t epoch = 0;
t0 = gmtime(&epoch);
tm->tm_year = t0->tm_year;
tm->tm_mon = t0->tm_mon;
tm->tm_mday = t0->tm_mday;
tm->tm_hour = t0->tm_hour;
tm->tm_min = t0->tm_min;
tm->tm_sec = t0->tm_sec;
if (tm->tm_year < 1900)
tm->tm_year += 1900;
tm->tm_mon++;
#ifdef DATEDEBUG
printf("GetEpochTime- %04d-%02d-%02d %02d:%02d:%02d\n",
tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec);
#endif
return;
} /* GetEpochTime() */
DateTime
SetDateTime(DateTime dt)
{
struct tm tt;
if (DATETIME_IS_CURRENT(dt))
{
GetCurrentTime(&tt);
tm2datetime(&tt, 0, NULL, &dt);
dt = dt2local(dt, -CTimeZone);
#ifdef DATEDEBUG
printf("SetDateTime- current time is %f\n", dt);
#endif
}
else
{ /* if (DATETIME_IS_EPOCH(dt1)) */
GetEpochTime(&tt);
tm2datetime(&tt, 0, NULL, &dt);
#ifdef DATEDEBUG
printf("SetDateTime- epoch time is %f\n", dt);
#endif
}
return dt;
} /* SetDateTime() */
/* datetime_relop - is datetime1 relop datetime2
*/
bool
datetime_eq(DateTime *datetime1, DateTime *datetime2)
{
DateTime dt1,
dt2;
if (!PointerIsValid(datetime1) || !PointerIsValid(datetime2))
return FALSE;
dt1 = *datetime1;
dt2 = *datetime2;
if (DATETIME_IS_INVALID(dt1) || DATETIME_IS_INVALID(dt2))
return FALSE;
if (DATETIME_IS_RELATIVE(dt1))
dt1 = SetDateTime(dt1);
if (DATETIME_IS_RELATIVE(dt2))
dt2 = SetDateTime(dt2);
return dt1 == dt2;
} /* datetime_eq() */
bool
datetime_ne(DateTime *datetime1, DateTime *datetime2)
{
DateTime dt1,
dt2;
if (!PointerIsValid(datetime1) || !PointerIsValid(datetime2))
return FALSE;
dt1 = *datetime1;
dt2 = *datetime2;
if (DATETIME_IS_INVALID(dt1) || DATETIME_IS_INVALID(dt2))
return FALSE;
if (DATETIME_IS_RELATIVE(dt1))
dt1 = SetDateTime(dt1);
if (DATETIME_IS_RELATIVE(dt2))
dt2 = SetDateTime(dt2);
return dt1 != dt2;
} /* datetime_ne() */
bool
datetime_lt(DateTime *datetime1, DateTime *datetime2)
{
DateTime dt1,
dt2;
if (!PointerIsValid(datetime1) || !PointerIsValid(datetime2))
return FALSE;
dt1 = *datetime1;
dt2 = *datetime2;
if (DATETIME_IS_INVALID(dt1) || DATETIME_IS_INVALID(dt2))
return FALSE;
if (DATETIME_IS_RELATIVE(dt1))
dt1 = SetDateTime(dt1);
if (DATETIME_IS_RELATIVE(dt2))
dt2 = SetDateTime(dt2);
return dt1 < dt2;
} /* datetime_lt() */
bool
datetime_gt(DateTime *datetime1, DateTime *datetime2)
{
DateTime dt1,
dt2;
if (!PointerIsValid(datetime1) || !PointerIsValid(datetime2))
return FALSE;
dt1 = *datetime1;
dt2 = *datetime2;
if (DATETIME_IS_INVALID(dt1) || DATETIME_IS_INVALID(dt2))
return FALSE;
if (DATETIME_IS_RELATIVE(dt1))
dt1 = SetDateTime(dt1);
if (DATETIME_IS_RELATIVE(dt2))
dt2 = SetDateTime(dt2);
#ifdef DATEDEBUG
printf("datetime_gt- %f %s greater than %f\n", dt1, ((dt1 > dt2) ? "is" : "is not"), dt2);
#endif
return dt1 > dt2;
} /* datetime_gt() */
bool
datetime_le(DateTime *datetime1, DateTime *datetime2)
{
DateTime dt1,
dt2;
if (!PointerIsValid(datetime1) || !PointerIsValid(datetime2))
return FALSE;
dt1 = *datetime1;
dt2 = *datetime2;
if (DATETIME_IS_INVALID(dt1) || DATETIME_IS_INVALID(dt2))
return FALSE;
if (DATETIME_IS_RELATIVE(dt1))
dt1 = SetDateTime(dt1);
if (DATETIME_IS_RELATIVE(dt2))
dt2 = SetDateTime(dt2);
return dt1 <= dt2;
} /* datetime_le() */
bool
datetime_ge(DateTime *datetime1, DateTime *datetime2)
{
DateTime dt1,
dt2;
if (!PointerIsValid(datetime1) || !PointerIsValid(datetime2))
return FALSE;
dt1 = *datetime1;
dt2 = *datetime2;
if (DATETIME_IS_INVALID(dt1) || DATETIME_IS_INVALID(dt2))
return FALSE;
if (DATETIME_IS_RELATIVE(dt1))
dt1 = SetDateTime(dt1);
if (DATETIME_IS_RELATIVE(dt2))
dt2 = SetDateTime(dt2);
return dt1 >= dt2;
} /* datetime_ge() */
/* datetime_cmp - 3-state comparison for datetime
* collate invalid datetime at the end
*/
int
datetime_cmp(DateTime *datetime1, DateTime *datetime2)
{
DateTime dt1,
dt2;
if (!PointerIsValid(datetime1) || !PointerIsValid(datetime2))
return 0;
dt1 = *datetime1;
dt2 = *datetime2;
if (DATETIME_IS_INVALID(dt1))
{
return (DATETIME_IS_INVALID(dt2) ? 0 : 1);
}
else if (DATETIME_IS_INVALID(dt2))
{
return -1;
}
else
{
if (DATETIME_IS_RELATIVE(dt1))
dt1 = SetDateTime(dt1);
if (DATETIME_IS_RELATIVE(dt2))
dt2 = SetDateTime(dt2);
}
return ((dt1 < dt2) ? -1 : ((dt1 > dt2) ? 1 : 0));
} /* datetime_cmp() */
/* timespan_relop - is timespan1 relop timespan2
*/
bool
timespan_eq(TimeSpan *timespan1, TimeSpan *timespan2)
{
if (!PointerIsValid(timespan1) || !PointerIsValid(timespan2))
return FALSE;
if (TIMESPAN_IS_INVALID(*timespan1) || TIMESPAN_IS_INVALID(*timespan2))
return FALSE;
return ((timespan1->time == timespan2->time)
&& (timespan1->month == timespan2->month));
} /* timespan_eq() */
bool
timespan_ne(TimeSpan *timespan1, TimeSpan *timespan2)
{
if (!PointerIsValid(timespan1) || !PointerIsValid(timespan2))
return FALSE;
if (TIMESPAN_IS_INVALID(*timespan1) || TIMESPAN_IS_INVALID(*timespan2))
return FALSE;
return ((timespan1->time != timespan2->time)
|| (timespan1->month != timespan2->month));
} /* timespan_ne() */
bool
timespan_lt(TimeSpan *timespan1, TimeSpan *timespan2)
{
double span1,
span2;
if (!PointerIsValid(timespan1) || !PointerIsValid(timespan2))
return FALSE;
if (TIMESPAN_IS_INVALID(*timespan1) || TIMESPAN_IS_INVALID(*timespan2))
return FALSE;
span1 = timespan1->time;
if (timespan1->month != 0)
span1 += (timespan1->month * (30.0 * 86400));
span2 = timespan2->time;
if (timespan2->month != 0)
span2 += (timespan2->month * (30.0 * 86400));
return span1 < span2;
} /* timespan_lt() */
bool
timespan_gt(TimeSpan *timespan1, TimeSpan *timespan2)
{
double span1,
span2;
if (!PointerIsValid(timespan1) || !PointerIsValid(timespan2))
return FALSE;
if (TIMESPAN_IS_INVALID(*timespan1) || TIMESPAN_IS_INVALID(*timespan2))
return FALSE;
span1 = timespan1->time;
if (timespan1->month != 0)
span1 += (timespan1->month * (30.0 * 86400));
span2 = timespan2->time;
if (timespan2->month != 0)
span2 += (timespan2->month * (30.0 * 86400));
return span1 > span2;
} /* timespan_gt() */
bool
timespan_le(TimeSpan *timespan1, TimeSpan *timespan2)
{
double span1,
span2;
if (!PointerIsValid(timespan1) || !PointerIsValid(timespan2))
return FALSE;
if (TIMESPAN_IS_INVALID(*timespan1) || TIMESPAN_IS_INVALID(*timespan2))
return FALSE;
span1 = timespan1->time;
if (timespan1->month != 0)
span1 += (timespan1->month * (30.0 * 86400));
span2 = timespan2->time;
if (timespan2->month != 0)
span2 += (timespan2->month * (30.0 * 86400));
return span1 <= span2;
} /* timespan_le() */
bool
timespan_ge(TimeSpan *timespan1, TimeSpan *timespan2)
{
double span1,
span2;
if (!PointerIsValid(timespan1) || !PointerIsValid(timespan2))
return FALSE;
if (TIMESPAN_IS_INVALID(*timespan1) || TIMESPAN_IS_INVALID(*timespan2))
return FALSE;
span1 = timespan1->time;
if (timespan1->month != 0)
span1 += (timespan1->month * (30.0 * 86400));
span2 = timespan2->time;
if (timespan2->month != 0)
span2 += (timespan2->month * (30.0 * 86400));
return span1 >= span2;
} /* timespan_ge() */
/* timespan_cmp - 3-state comparison for timespan
*/
int
timespan_cmp(TimeSpan *timespan1, TimeSpan *timespan2)
{
double span1,
span2;
if (!PointerIsValid(timespan1) || !PointerIsValid(timespan2))
return 0;
if (TIMESPAN_IS_INVALID(*timespan1))
{
return TIMESPAN_IS_INVALID(*timespan2) ? 0 : 1;
}
else if (TIMESPAN_IS_INVALID(*timespan2))
return -1;
span1 = timespan1->time;
if (timespan1->month != 0)
span1 += (timespan1->month * (30.0 * 86400));
span2 = timespan2->time;
if (timespan2->month != 0)
span2 += (timespan2->month * (30.0 * 86400));
return (span1 < span2) ? -1 : (span1 > span2) ? 1 : 0;
} /* timespan_cmp() */
/*----------------------------------------------------------
* "Arithmetic" operators on date/times.
* datetime_foo returns foo as an object (pointer) that
* can be passed between languages.
* datetime_xx is an internal routine which returns the
* actual value.
*---------------------------------------------------------*/
DateTime *
datetime_smaller(DateTime *datetime1, DateTime *datetime2)
{
DateTime *result;
DateTime dt1,
dt2;
if (!PointerIsValid(datetime1) || !PointerIsValid(datetime2))
return NULL;
dt1 = *datetime1;
dt2 = *datetime2;
result = palloc(sizeof(DateTime));
if (DATETIME_IS_RELATIVE(dt1))
dt1 = SetDateTime(dt1);
if (DATETIME_IS_RELATIVE(dt2))
dt2 = SetDateTime(dt2);
if (DATETIME_IS_INVALID(dt1))
*result = dt2;
else if (DATETIME_IS_INVALID(dt2))
*result = dt1;
else
*result = ((dt2 < dt1) ? dt2 : dt1);
return result;
} /* datetime_smaller() */
DateTime *
datetime_larger(DateTime *datetime1, DateTime *datetime2)
{
DateTime *result;
DateTime dt1,
dt2;
if (!PointerIsValid(datetime1) || !PointerIsValid(datetime2))
return NULL;
dt1 = *datetime1;
dt2 = *datetime2;
result = palloc(sizeof(DateTime));
if (DATETIME_IS_RELATIVE(dt1))
dt1 = SetDateTime(dt1);
if (DATETIME_IS_RELATIVE(dt2))
dt2 = SetDateTime(dt2);
if (DATETIME_IS_INVALID(dt1))
*result = dt2;
else if (DATETIME_IS_INVALID(dt2))
*result = dt1;
else
*result = ((dt2 > dt1) ? dt2 : dt1);
return result;
} /* datetime_larger() */
TimeSpan *
datetime_mi(DateTime *datetime1, DateTime *datetime2)
{
TimeSpan *result;
DateTime dt1,
dt2;
if (!PointerIsValid(datetime1) || !PointerIsValid(datetime2))
return NULL;
dt1 = *datetime1;
dt2 = *datetime2;
result = palloc(sizeof(TimeSpan));
if (DATETIME_IS_RELATIVE(dt1))
dt1 = SetDateTime(dt1);
if (DATETIME_IS_RELATIVE(dt2))
dt2 = SetDateTime(dt2);
#ifdef DATEDEBUG
printf("datetime_mi- evaluate %f - %f\n", dt1, dt2);
#endif
if (DATETIME_IS_INVALID(dt1)
|| DATETIME_IS_INVALID(dt2))
{
DATETIME_INVALID(result->time);
}
else
result->time = JROUND(dt1 - dt2);
result->month = 0;
return result;
} /* datetime_mi() */
/* datetime_pl_span()
* Add a timespan to a datetime data type.
* Note that timespan has provisions for qualitative year/month
* units, so try to do the right thing with them.
* To add a month, increment the month, and use the same day of month.
* Then, if the next month has fewer days, set the day of month
* to the last day of month.
*/
DateTime *
datetime_pl_span(DateTime *datetime, TimeSpan *span)
{
DateTime *result;
DateTime dt;
int tz;
char *tzn;
if ((!PointerIsValid(datetime)) || (!PointerIsValid(span)))
return NULL;
result = palloc(sizeof(DateTime));
#ifdef DATEDEBUG
printf("datetime_pl_span- add %f to %d %f\n", *datetime, span->month, span->time);
#endif
if (DATETIME_NOT_FINITE(*datetime))
{
*result = *datetime;
}
else if (TIMESPAN_IS_INVALID(*span))
{
DATETIME_INVALID(*result);
}
else
{
dt = (DATETIME_IS_RELATIVE(*datetime) ? SetDateTime(*datetime) : *datetime);
#ifdef ROUND_ALL
dt = JROUND(dt + span->time);
#else
dt += span->time;
#endif
if (span->month != 0)
{
struct tm tt,
*tm = &tt;
double fsec;
if (datetime2tm(dt, &tz, tm, &fsec, &tzn) == 0)
{
#ifdef DATEDEBUG
printf("datetime_pl_span- date was %04d-%02d-%02d %02d:%02d:%02d\n",
tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec);
#endif
tm->tm_mon += span->month;
if (tm->tm_mon > 12)
{
tm->tm_year += ((tm->tm_mon - 1) / 12);
tm->tm_mon = (((tm->tm_mon - 1) % 12) + 1);
}
else if (tm->tm_mon < 1)
{
tm->tm_year += ((tm->tm_mon / 12) - 1);
tm->tm_mon = ((tm->tm_mon % 12) + 12);
}
/* adjust for end of month boundary problems... */
#if 0
if (tm->tm_mday > mdays[tm->tm_mon - 1])
{
if ((tm->tm_mon == 2) && isleap(tm->tm_year))
tm->tm_mday = (mdays[tm->tm_mon - 1] + 1);
else
tm->tm_mday = mdays[tm->tm_mon - 1];
}
#endif
if (tm->tm_mday > day_tab[isleap(tm->tm_year)][tm->tm_mon - 1])
tm->tm_mday = (day_tab[isleap(tm->tm_year)][tm->tm_mon - 1]);
#ifdef DATEDEBUG
printf("datetime_pl_span- date becomes %04d-%02d-%02d %02d:%02d:%02d\n",
tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec);
#endif
if (tm2datetime(tm, fsec, &tz, &dt) != 0)
elog(ERROR, "Unable to add datetime and timespan", NULL);
}
else
DATETIME_INVALID(dt);
}
*result = dt;
}
return result;
} /* datetime_pl_span() */
DateTime *
datetime_mi_span(DateTime *datetime, TimeSpan *span)
{
DateTime *result;
TimeSpan tspan;
if (!PointerIsValid(datetime) || !PointerIsValid(span))
return NULL;
tspan.month = -span->month;
tspan.time = -span->time;
result = datetime_pl_span(datetime, &tspan);
return result;
} /* datetime_mi_span() */
TimeSpan *
timespan_um(TimeSpan *timespan)
{
TimeSpan *result;
if (!PointerIsValid(timespan))
return NULL;
result = palloc(sizeof(TimeSpan));
result->time = -(timespan->time);
result->month = -(timespan->month);
return result;
} /* timespan_um() */
TimeSpan *
timespan_smaller(TimeSpan *timespan1, TimeSpan *timespan2)
{
TimeSpan *result;
double span1,
span2;
if (!PointerIsValid(timespan1) || !PointerIsValid(timespan2))
return NULL;
result = palloc(sizeof(TimeSpan));
if (TIMESPAN_IS_INVALID(*timespan1))
{
result->time = timespan2->time;
result->month = timespan2->month;
}
else if (TIMESPAN_IS_INVALID(*timespan2))
{
result->time = timespan1->time;
result->month = timespan1->month;
}
else
{
span1 = timespan1->time;
if (timespan1->month != 0)
span1 += (timespan1->month * (30.0 * 86400));
span2 = timespan2->time;
if (timespan2->month != 0)
span2 += (timespan2->month * (30.0 * 86400));
#ifdef DATEDEBUG
printf("timespan_smaller- months %d %d times %f %f spans %f %f\n",
timespan1->month, timespan2->month, timespan1->time, timespan2->time, span1, span2);
#endif
if (span2 < span1)
{
result->time = timespan2->time;
result->month = timespan2->month;
}
else
{
result->time = timespan1->time;
result->month = timespan1->month;
}
}
return result;
} /* timespan_smaller() */
TimeSpan *
timespan_larger(TimeSpan *timespan1, TimeSpan *timespan2)
{
TimeSpan *result;
double span1,
span2;
if (!PointerIsValid(timespan1) || !PointerIsValid(timespan2))
return NULL;
result = palloc(sizeof(TimeSpan));
if (TIMESPAN_IS_INVALID(*timespan1))
{
result->time = timespan2->time;
result->month = timespan2->month;
}
else if (TIMESPAN_IS_INVALID(*timespan2))
{
result->time = timespan1->time;
result->month = timespan1->month;
}
else
{
span1 = timespan1->time;
if (timespan1->month != 0)
span1 += (timespan1->month * (30.0 * 86400));
span2 = timespan2->time;
if (timespan2->month != 0)
span2 += (timespan2->month * (30.0 * 86400));
#ifdef DATEDEBUG
printf("timespan_larger- months %d %d times %f %f spans %f %f\n",
timespan1->month, timespan2->month, timespan1->time, timespan2->time, span1, span2);
#endif
if (span2 > span1)
{
result->time = timespan2->time;
result->month = timespan2->month;
}
else
{
result->time = timespan1->time;
result->month = timespan1->month;
}
}
return result;
} /* timespan_larger() */
TimeSpan *
timespan_pl(TimeSpan *span1, TimeSpan *span2)
{
TimeSpan *result;
if ((!PointerIsValid(span1)) || (!PointerIsValid(span2)))
return NULL;
result = palloc(sizeof(TimeSpan));
result->month = (span1->month + span2->month);
result->time = JROUND(span1->time + span2->time);
return result;
} /* timespan_pl() */
TimeSpan *
timespan_mi(TimeSpan *span1, TimeSpan *span2)
{
TimeSpan *result;
if ((!PointerIsValid(span1)) || (!PointerIsValid(span2)))
return NULL;
result = palloc(sizeof(TimeSpan));
result->month = (span1->month - span2->month);
result->time = JROUND(span1->time - span2->time);
return result;
} /* timespan_mi() */
TimeSpan *
timespan_div(TimeSpan *span1, float8 *arg2)
{
TimeSpan *result;
if ((!PointerIsValid(span1)) || (!PointerIsValid(arg2)))
return NULL;
if (!PointerIsValid(result = palloc(sizeof(TimeSpan))))
elog(ERROR, "Memory allocation failed, can't subtract timespans", NULL);
if (*arg2 == 0.0)
elog(ERROR, "timespan_div: divide by 0.0 error");
result->month = rint(span1->month / *arg2);
result->time = JROUND(span1->time / *arg2);
return result;
} /* timespan_div() */
/* datetime_age()
* Calculate time difference while retaining year/month fields.
* Note that this does not result in an accurate absolute time span
* since year and month are out of context once the arithmetic
* is done.
*/
TimeSpan *
datetime_age(DateTime *datetime1, DateTime *datetime2)
{
TimeSpan *result;
DateTime dt1,
dt2;
double fsec,
fsec1,
fsec2;
struct tm tt,
*tm = &tt;
struct tm tt1,
*tm1 = &tt1;
struct tm tt2,
*tm2 = &tt2;
if (!PointerIsValid(datetime1) || !PointerIsValid(datetime2))
return NULL;
result = palloc(sizeof(TimeSpan));
dt1 = *datetime1;
dt2 = *datetime2;
if (DATETIME_IS_RELATIVE(dt1))
dt1 = SetDateTime(dt1);
if (DATETIME_IS_RELATIVE(dt2))
dt2 = SetDateTime(dt2);
if (DATETIME_IS_INVALID(dt1)
|| DATETIME_IS_INVALID(dt2))
{
DATETIME_INVALID(result->time);
}
else if ((datetime2tm(dt1, NULL, tm1, &fsec1, NULL) == 0)
&& (datetime2tm(dt2, NULL, tm2, &fsec2, NULL) == 0))
{
fsec = (fsec1 - fsec2);
tm->tm_sec = (tm1->tm_sec - tm2->tm_sec);
tm->tm_min = (tm1->tm_min - tm2->tm_min);
tm->tm_hour = (tm1->tm_hour - tm2->tm_hour);
tm->tm_mday = (tm1->tm_mday - tm2->tm_mday);
tm->tm_mon = (tm1->tm_mon - tm2->tm_mon);
tm->tm_year = (tm1->tm_year - tm2->tm_year);
/* flip sign if necessary... */
if (dt1 < dt2)
{
fsec = -fsec;
tm->tm_sec = -tm->tm_sec;
tm->tm_min = -tm->tm_min;
tm->tm_hour = -tm->tm_hour;
tm->tm_mday = -tm->tm_mday;
tm->tm_mon = -tm->tm_mon;
tm->tm_year = -tm->tm_year;
}
if (tm->tm_sec < 0)
{
tm->tm_sec += 60;
tm->tm_min--;
}
if (tm->tm_min < 0)
{
tm->tm_min += 60;
tm->tm_hour--;
}
if (tm->tm_hour < 0)
{
tm->tm_hour += 24;
tm->tm_mday--;
}
if (tm->tm_mday < 0)
{
if (dt1 < dt2)
{
#if 0
tm->tm_mday += mdays[tm1->tm_mon - 1];
if (isleap(tm1->tm_year) && (tm1->tm_mon == 2))
tm->tm_mday++;
#endif
tm->tm_mday += day_tab[isleap(tm1->tm_year)][tm1->tm_mon - 1];
tm->tm_mon--;
}
else
{
#if 0
tm->tm_mday += mdays[tm2->tm_mon - 1];
if (isleap(tm2->tm_year) && (tm2->tm_mon == 2))
tm->tm_mday++;
#endif
tm->tm_mday += day_tab[isleap(tm2->tm_year)][tm2->tm_mon - 1];
tm->tm_mon--;
}
}
if (tm->tm_mon < 0)
{
tm->tm_mon += 12;
tm->tm_year--;
}
/* recover sign if necessary... */
if (dt1 < dt2)
{
fsec = -fsec;
tm->tm_sec = -tm->tm_sec;
tm->tm_min = -tm->tm_min;
tm->tm_hour = -tm->tm_hour;
tm->tm_mday = -tm->tm_mday;
tm->tm_mon = -tm->tm_mon;
tm->tm_year = -tm->tm_year;
}
if (tm2timespan(tm, fsec, result) != 0)
elog(ERROR, "Unable to decode datetime", NULL);
}
else
elog(ERROR, "Unable to decode datetime", NULL);
return result;
} /* datetime_age() */
/*----------------------------------------------------------
* Conversion operators.
*---------------------------------------------------------*/
/* datetime_text()
* Convert datetime to text data type.
*/
text *
datetime_text(DateTime *datetime)
{
text *result;
char *str;
int len;
if (!PointerIsValid(datetime))
return NULL;
str = datetime_out(datetime);
if (!PointerIsValid(str))
return NULL;
len = (strlen(str) + VARHDRSZ);
result = palloc(len);
VARSIZE(result) = len;
memmove(VARDATA(result), str, (len - VARHDRSZ));
pfree(str);
return result;
} /* datetime_text() */
/* text_datetime()
* Convert text string to datetime.
* Text type is not null terminated, so use temporary string
* then call the standard input routine.
*/
DateTime *
text_datetime(text *str)
{
DateTime *result;
int i;
char *sp,
*dp,
dstr[MAXDATELEN + 1];
if (!PointerIsValid(str))
return NULL;
sp = VARDATA(str);
dp = dstr;
for (i = 0; i < (VARSIZE(str) - VARHDRSZ); i++)
*dp++ = *sp++;
*dp = '\0';
result = datetime_in(dstr);
return result;
} /* text_datetime() */
/* timespan_text()
* Convert timespan to text data type.
*/
text *
timespan_text(TimeSpan *timespan)
{
text *result;
char *str;
int len;
if (!PointerIsValid(timespan))
return NULL;
str = timespan_out(timespan);
if (!PointerIsValid(str))
return NULL;
len = (strlen(str) + VARHDRSZ);
result = palloc(len);
VARSIZE(result) = len;
memmove(VARDATA(result), str, (len - VARHDRSZ));
pfree(str);
return result;
} /* timespan_text() */
/* text_timespan()
* Convert text string to timespan.
* Text type may not be null terminated, so copy to temporary string
* then call the standard input routine.
*/
TimeSpan *
text_timespan(text *str)
{
TimeSpan *result;
int i;
char *sp,
*dp,
dstr[MAXDATELEN + 1];
if (!PointerIsValid(str))
return NULL;
sp = VARDATA(str);
dp = dstr;
for (i = 0; i < (VARSIZE(str) - VARHDRSZ); i++)
*dp++ = *sp++;
*dp = '\0';
result = timespan_in(dstr);
return result;
} /* text_timespan() */
/* datetime_trunc()
* Extract specified field from datetime.
*/
DateTime *
datetime_trunc(text *units, DateTime *datetime)
{
DateTime *result;
DateTime dt;
int tz;
int type,
val;
int i;
char *up,
*lp,
lowunits[MAXDATELEN + 1];
double fsec;
char *tzn;
struct tm tt,
*tm = &tt;
if ((!PointerIsValid(units)) || (!PointerIsValid(datetime)))
return NULL;
result = palloc(sizeof(DateTime));
up = VARDATA(units);
lp = lowunits;
for (i = 0; i < (VARSIZE(units) - VARHDRSZ); i++)
*lp++ = tolower(*up++);
*lp = '\0';
type = DecodeUnits(0, lowunits, &val);
#ifdef DATEDEBUG
if (type == IGNORE)
strcpy(lowunits, "(unknown)");
printf("datetime_trunc- units %s type=%d value=%d\n", lowunits, type, val);
#endif
if (DATETIME_NOT_FINITE(*datetime))
{
#if NOT_USED
/* should return null but Postgres doesn't like that currently. - tgl 97/06/12 */
elog(ERROR, "Datetime is not finite", NULL);
#endif
*result = 0;
}
else
{
dt = (DATETIME_IS_RELATIVE(*datetime) ? SetDateTime(*datetime) : *datetime);
if ((type == UNITS) && (datetime2tm(dt, &tz, tm, &fsec, &tzn) == 0))
{
switch (val)
{
case DTK_MILLENIUM:
tm->tm_year = (tm->tm_year / 1000) * 1000;
case DTK_CENTURY:
tm->tm_year = (tm->tm_year / 100) * 100;
case DTK_DECADE:
tm->tm_year = (tm->tm_year / 10) * 10;
case DTK_YEAR:
tm->tm_mon = 1;
case DTK_QUARTER:
tm->tm_mon = (3 * (tm->tm_mon / 4)) + 1;
case DTK_MONTH:
tm->tm_mday = 1;
case DTK_DAY:
tm->tm_hour = 0;
case DTK_HOUR:
tm->tm_min = 0;
case DTK_MINUTE:
tm->tm_sec = 0;
case DTK_SECOND:
fsec = 0;
break;
case DTK_MILLISEC:
fsec = rint(fsec * 1000) / 1000;
break;
case DTK_MICROSEC:
fsec = rint(fsec * 1000) / 1000;
break;
default:
elog(ERROR, "Datetime units '%s' not supported", lowunits);
result = NULL;
}
if (IS_VALID_UTIME(tm->tm_year, tm->tm_mon, tm->tm_mday))
{
#ifdef USE_POSIX_TIME
tm->tm_isdst = -1;
tm->tm_year -= 1900;
tm->tm_mon -= 1;
tm->tm_isdst = -1;
mktime(tm);
tm->tm_year += 1900;
tm->tm_mon += 1;
#if defined(HAVE_TM_ZONE)
tz = -(tm->tm_gmtoff); /* tm_gmtoff is Sun/DEC-ism */
#elif defined(HAVE_INT_TIMEZONE)
tz = ((tm->tm_isdst > 0) ? (timezone - 3600) : timezone);
#else
#error USE_POSIX_TIME is defined but neither HAVE_TM_ZONE or HAVE_INT_TIMEZONE are defined
#endif
#else /* !USE_POSIX_TIME */
tz = CTimeZone;
#endif
}
else
{
tm->tm_isdst = 0;
tz = 0;
}
if (tm2datetime(tm, fsec, &tz, result) != 0)
elog(ERROR, "Unable to truncate datetime to '%s'", lowunits);
#if NOT_USED
}
else if ((type == RESERV) && (val == DTK_EPOCH))
{
DATETIME_EPOCH(*result);
*result = dt - SetDateTime(*result);
#endif
}
else
{
elog(ERROR, "Datetime units '%s' not recognized", lowunits);
result = NULL;
}
}
return result;
} /* datetime_trunc() */
/* timespan_trunc()
* Extract specified field from timespan.
*/
TimeSpan *
timespan_trunc(text *units, TimeSpan *timespan)
{
TimeSpan *result;
int type,
val;
int i;
char *up,
*lp,
lowunits[MAXDATELEN + 1];
double fsec;
struct tm tt,
*tm = &tt;
if ((!PointerIsValid(units)) || (!PointerIsValid(timespan)))
return NULL;
result = palloc(sizeof(TimeSpan));
up = VARDATA(units);
lp = lowunits;
for (i = 0; i < (VARSIZE(units) - VARHDRSZ); i++)
*lp++ = tolower(*up++);
*lp = '\0';
type = DecodeUnits(0, lowunits, &val);
#ifdef DATEDEBUG
if (type == IGNORE)
strcpy(lowunits, "(unknown)");
printf("timespan_trunc- units %s type=%d value=%d\n", lowunits, type, val);
#endif
if (TIMESPAN_IS_INVALID(*timespan))
{
#if NOT_USED
elog(ERROR, "Timespan is not finite", NULL);
#endif
result = NULL;
}
else if (type == UNITS)
{
if (timespan2tm(*timespan, tm, &fsec) == 0)
{
switch (val)
{
case DTK_MILLENIUM:
tm->tm_year = (tm->tm_year / 1000) * 1000;
case DTK_CENTURY:
tm->tm_year = (tm->tm_year / 100) * 100;
case DTK_DECADE:
tm->tm_year = (tm->tm_year / 10) * 10;
case DTK_YEAR:
tm->tm_mon = 0;
case DTK_QUARTER:
tm->tm_mon = (3 * (tm->tm_mon / 4));
case DTK_MONTH:
tm->tm_mday = 0;
case DTK_DAY:
tm->tm_hour = 0;
case DTK_HOUR:
tm->tm_min = 0;
case DTK_MINUTE:
tm->tm_sec = 0;
case DTK_SECOND:
fsec = 0;
break;
case DTK_MILLISEC:
fsec = rint(fsec * 1000) / 1000;
break;
case DTK_MICROSEC:
fsec = rint(fsec * 1000) / 1000;
break;
default:
elog(ERROR, "Timespan units '%s' not supported", lowunits);
result = NULL;
}
if (tm2timespan(tm, fsec, result) != 0)
elog(ERROR, "Unable to truncate timespan to '%s'", lowunits);
}
else
{
elog(NOTICE, "Timespan out of range", NULL);
result = NULL;
}
#if NOT_USED
}
else if ((type == RESERV) && (val == DTK_EPOCH))
{
*result = timespan->time;
if (timespan->month != 0)
{
*result += ((365.25 * 86400) * (timespan->month / 12));
*result += ((30 * 86400) * (timespan->month % 12));
}
#endif
}
else
{
elog(ERROR, "Timespan units '%s' not recognized", units);
result = NULL;
}
return result;
} /* timespan_trunc() */
/* datetime_part()
* Extract specified field from datetime.
*/
float64
datetime_part(text *units, DateTime *datetime)
{
float64 result;
DateTime dt;
int tz;
int type,
val;
int i;
char *up,
*lp,
lowunits[MAXDATELEN + 1];
double dummy;
double fsec;
char *tzn;
struct tm tt,
*tm = &tt;
if ((!PointerIsValid(units)) || (!PointerIsValid(datetime)))
return NULL;
result = palloc(sizeof(float64data));
up = VARDATA(units);
lp = lowunits;
for (i = 0; i < (VARSIZE(units) - VARHDRSZ); i++)
*lp++ = tolower(*up++);
*lp = '\0';
type = DecodeUnits(0, lowunits, &val);
if (type == IGNORE)
type = DecodeSpecial(0, lowunits, &val);
#ifdef DATEDEBUG
if (type == IGNORE)
strcpy(lowunits, "(unknown)");
printf("datetime_part- units %s type=%d value=%d\n", lowunits, type, val);
#endif
if (DATETIME_NOT_FINITE(*datetime))
{
#if NOT_USED
/* should return null but Postgres doesn't like that currently. - tgl 97/06/12 */
elog(ERROR, "Datetime is not finite", NULL);
#endif
*result = 0;
}
else
{
dt = (DATETIME_IS_RELATIVE(*datetime) ? SetDateTime(*datetime) : *datetime);
if ((type == UNITS) && (datetime2tm(dt, &tz, tm, &fsec, &tzn) == 0))
{
switch (val)
{
case DTK_TZ:
*result = tz;
break;
case DTK_TZ_MINUTE:
*result = tz / 60;
TMODULO(*result, dummy, 60e0);
break;
case DTK_TZ_HOUR:
dummy = tz;
TMODULO(dummy, *result, 3600e0);
break;
case DTK_MICROSEC:
*result = (fsec * 1000000);
break;
case DTK_MILLISEC:
*result = (fsec * 1000);
break;
case DTK_SECOND:
*result = (tm->tm_sec + fsec);
break;
case DTK_MINUTE:
*result = tm->tm_min;
break;
case DTK_HOUR:
*result = tm->tm_hour;
break;
case DTK_DAY:
*result = tm->tm_mday;
break;
case DTK_MONTH:
*result = tm->tm_mon;
break;
case DTK_QUARTER:
*result = (tm->tm_mon / 4) + 1;
break;
case DTK_YEAR:
*result = tm->tm_year;
break;
case DTK_DECADE:
*result = (tm->tm_year / 10) + 1;
break;
case DTK_CENTURY:
*result = (tm->tm_year / 100) + 1;
break;
case DTK_MILLENIUM:
*result = (tm->tm_year / 1000) + 1;
break;
default:
elog(ERROR, "Datetime units '%s' not supported", lowunits);
*result = 0;
}
}
else if (type == RESERV)
{
switch (val)
{
case DTK_EPOCH:
DATETIME_EPOCH(*result);
*result = dt - SetDateTime(*result);
break;
case DTK_DOW:
if (datetime2tm(dt, &tz, tm, &fsec, &tzn) != 0)
elog(ERROR, "Unable to encode datetime", NULL);
*result = j2day(date2j(tm->tm_year, tm->tm_mon, tm->tm_mday));
break;
case DTK_DOY:
if (datetime2tm(dt, &tz, tm, &fsec, &tzn) != 0)
elog(ERROR, "Unable to encode datetime", NULL);
*result = (date2j(tm->tm_year, tm->tm_mon, tm->tm_mday)
- date2j(tm->tm_year, 1, 1) + 1);
break;
default:
elog(ERROR, "Datetime units '%s' not supported", lowunits);
*result = 0;
}
}
else
{
elog(ERROR, "Datetime units '%s' not recognized", lowunits);
*result = 0;
}
}
return result;
} /* datetime_part() */
/* timespan_part()
* Extract specified field from timespan.
*/
float64
timespan_part(text *units, TimeSpan *timespan)
{
float64 result;
int type,
val;
int i;
char *up,
*lp,
lowunits[MAXDATELEN + 1];
double fsec;
struct tm tt,
*tm = &tt;
if ((!PointerIsValid(units)) || (!PointerIsValid(timespan)))
return NULL;
result = palloc(sizeof(float64data));
up = VARDATA(units);
lp = lowunits;
for (i = 0; i < (VARSIZE(units) - VARHDRSZ); i++)
*lp++ = tolower(*up++);
*lp = '\0';
type = DecodeUnits(0, lowunits, &val);
if (type == IGNORE)
type = DecodeSpecial(0, lowunits, &val);
#ifdef DATEDEBUG
if (type == IGNORE)
strcpy(lowunits, "(unknown)");
printf("timespan_part- units %s type=%d value=%d\n", lowunits, type, val);
#endif
if (TIMESPAN_IS_INVALID(*timespan))
{
#if NOT_USED
elog(ERROR, "Timespan is not finite", NULL);
#endif
*result = 0;
}
else if (type == UNITS)
{
if (timespan2tm(*timespan, tm, &fsec) == 0)
{
switch (val)
{
case DTK_MICROSEC:
*result = (fsec * 1000000);
break;
case DTK_MILLISEC:
*result = (fsec * 1000);
break;
case DTK_SECOND:
*result = (tm->tm_sec + fsec);
break;
case DTK_MINUTE:
*result = tm->tm_min;
break;
case DTK_HOUR:
*result = tm->tm_hour;
break;
case DTK_DAY:
*result = tm->tm_mday;
break;
case DTK_MONTH:
*result = tm->tm_mon;
break;
case DTK_QUARTER:
*result = (tm->tm_mon / 4) + 1;
break;
case DTK_YEAR:
*result = tm->tm_year;
break;
case DTK_DECADE:
*result = (tm->tm_year / 10);
break;
case DTK_CENTURY:
*result = (tm->tm_year / 100);
break;
case DTK_MILLENIUM:
*result = (tm->tm_year / 1000);
break;
default:
elog(ERROR, "Timespan units '%s' not yet supported", units);
result = NULL;
}
}
else
{
elog(NOTICE, "Timespan out of range", NULL);
*result = 0;
}
}
else if ((type == RESERV) && (val == DTK_EPOCH))
{
*result = timespan->time;
if (timespan->month != 0)
{
*result += ((365.25 * 86400) * (timespan->month / 12));
*result += ((30 * 86400) * (timespan->month % 12));
}
}
else
{
elog(ERROR, "Timespan units '%s' not recognized", units);
*result = 0;
}
return result;
} /* timespan_part() */
/* datetime_zone()
* Encode datetime type with specified time zone.
*/
text *
datetime_zone(text *zone, DateTime *datetime)
{
text *result;
DateTime dt;
int tz;
int type,
val;
int i;
char *up,
*lp,
lowzone[MAXDATELEN + 1];
char *tzn,
upzone[MAXDATELEN + 1];
double fsec;
struct tm tt,
*tm = &tt;
char buf[MAXDATELEN + 1];
int len;
if ((!PointerIsValid(zone)) || (!PointerIsValid(datetime)))
return NULL;
up = VARDATA(zone);
lp = lowzone;
for (i = 0; i < (VARSIZE(zone) - VARHDRSZ); i++)
*lp++ = tolower(*up++);
*lp = '\0';
type = DecodeSpecial(0, lowzone, &val);
#ifdef DATEDEBUG
if (type == IGNORE)
strcpy(lowzone, "(unknown)");
printf("datetime_zone- zone %s type=%d value=%d\n", lowzone, type, val);
#endif
if (DATETIME_NOT_FINITE(*datetime))
{
/*
* could return null but Postgres doesn't like that currently. -
* tgl 97/06/12
*/
elog(ERROR, "Datetime is not finite", NULL);
result = NULL;
}
else if ((type == TZ) || (type == DTZ))
{
tm->tm_isdst = ((type == DTZ) ? 1 : 0);
tz = val * 60;
dt = (DATETIME_IS_RELATIVE(*datetime) ? SetDateTime(*datetime) : *datetime);
dt = dt2local(dt, tz);
if (datetime2tm(dt, NULL, tm, &fsec, NULL) != 0)
elog(ERROR, "Datetime not legal", NULL);
up = upzone;
lp = lowzone;
for (i = 0; *lp != '\0'; i++)
*up++ = toupper(*lp++);
*up = '\0';
tzn = upzone;
EncodeDateTime(tm, fsec, &tz, &tzn, DateStyle, buf);
len = (strlen(buf) + VARHDRSZ);
result = palloc(len);
VARSIZE(result) = len;
memmove(VARDATA(result), buf, (len - VARHDRSZ));
}
else
{
elog(ERROR, "Time zone '%s' not recognized", lowzone);
result = NULL;
}
return result;
} /* datetime_zone() */
/*****************************************************************************
* PRIVATE ROUTINES *
*****************************************************************************/
/* definitions for squeezing values into "value" */
#define ABS_SIGNBIT (char) 0200
#define VALMASK (char) 0177
#define NEG(n) ((n)|ABS_SIGNBIT)
#define SIGNEDCHAR(c) ((c)&ABS_SIGNBIT? -((c)&VALMASK): (c))
#define FROMVAL(tp) (-SIGNEDCHAR((tp)->value) * 10) /* uncompress */
#define TOVAL(tp, v) ((tp)->value = ((v) < 0? NEG((-(v))/10): (v)/10))
/*
* to keep this table reasonably small, we divide the lexval for TZ and DTZ
* entries by 10 and truncate the text field at MAXTOKLEN characters.
* the text field is not guaranteed to be NULL-terminated.
*/
static datetkn datetktbl[] = {
/* text token lexval */
{EARLY, RESERV, DTK_EARLY}, /* "-infinity" reserved for "early time" */
{"acsst", DTZ, 63}, /* Cent. Australia */
{"acst", TZ, 57}, /* Cent. Australia */
{DA_D, ADBC, AD}, /* "ad" for years >= 0 */
{"abstime", IGNORE, 0}, /* "abstime" for pre-v6.1 "Invalid
* Abstime" */
{"adt", DTZ, NEG(18)}, /* Atlantic Daylight Time */
{"aesst", DTZ, 66}, /* E. Australia */
{"aest", TZ, 60}, /* Australia Eastern Std Time */
{"ahst", TZ, NEG(60)}, /* Alaska-Hawaii Std Time */
{"allballs", RESERV, DTK_ZULU}, /* 00:00:00 */
{"am", AMPM, AM},
{"apr", MONTH, 4},
{"april", MONTH, 4},
{"ast", TZ, NEG(24)}, /* Atlantic Std Time (Canada) */
{"at", IGNORE, 0}, /* "at" (throwaway) */
{"aug", MONTH, 8},
{"august", MONTH, 8},
{"awsst", DTZ, 54}, /* W. Australia */
{"awst", TZ, 48}, /* W. Australia */
{DB_C, ADBC, BC}, /* "bc" for years < 0 */
{"bst", TZ, 6}, /* British Summer Time */
{"bt", TZ, 18}, /* Baghdad Time */
{"cadt", DTZ, 63}, /* Central Australian DST */
{"cast", TZ, 57}, /* Central Australian ST */
{"cat", TZ, NEG(60)}, /* Central Alaska Time */
{"cct", TZ, 48}, /* China Coast */
{"cdt", DTZ, NEG(30)}, /* Central Daylight Time */
{"cet", TZ, 6}, /* Central European Time */
{"cetdst", DTZ, 12}, /* Central European Dayl.Time */
{"cst", TZ, NEG(36)}, /* Central Standard Time */
{DCURRENT, RESERV, DTK_CURRENT}, /* "current" is always now */
{"dec", MONTH, 12},
{"december", MONTH, 12},
{"dnt", TZ, 6}, /* Dansk Normal Tid */
{"dow", RESERV, DTK_DOW}, /* day of week */
{"doy", RESERV, DTK_DOY}, /* day of year */
{"dst", DTZMOD, 6},
{"east", TZ, NEG(60)}, /* East Australian Std Time */
{"edt", DTZ, NEG(24)}, /* Eastern Daylight Time */
{"eet", TZ, 12}, /* East. Europe, USSR Zone 1 */
{"eetdst", DTZ, 18}, /* Eastern Europe */
{EPOCH, RESERV, DTK_EPOCH}, /* "epoch" reserved for system epoch time */
#if USE_AUSTRALIAN_RULES
{"est", TZ, 60}, /* Australia Eastern Std Time */
#else
{"est", TZ, NEG(30)}, /* Eastern Standard Time */
#endif
{"feb", MONTH, 2},
{"february", MONTH, 2},
{"fri", DOW, 5},
{"friday", DOW, 5},
{"fst", TZ, 6}, /* French Summer Time */
{"fwt", DTZ, 12}, /* French Winter Time */
{"gmt", TZ, 0}, /* Greenwish Mean Time */
{"gst", TZ, 60}, /* Guam Std Time, USSR Zone 9 */
{"hdt", DTZ, NEG(54)}, /* Hawaii/Alaska */
{"hmt", DTZ, 18}, /* Hellas ? ? */
{"hst", TZ, NEG(60)}, /* Hawaii Std Time */
{"idle", TZ, 72}, /* Intl. Date Line, East */
{"idlw", TZ, NEG(72)}, /* Intl. Date Line, West */
{LATE, RESERV, DTK_LATE}, /* "infinity" reserved for "late time" */
{INVALID, RESERV, DTK_INVALID},
/* "invalid" reserved for invalid time */
{"ist", TZ, 12}, /* Israel */
{"it", TZ, 21}, /* Iran Time */
{"jan", MONTH, 1},
{"january", MONTH, 1},
{"jst", TZ, 54}, /* Japan Std Time,USSR Zone 8 */
{"jt", TZ, 45}, /* Java Time */
{"jul", MONTH, 7},
{"july", MONTH, 7},
{"jun", MONTH, 6},
{"june", MONTH, 6},
{"kst", TZ, 54}, /* Korea Standard Time */
{"ligt", TZ, 60}, /* From Melbourne, Australia */
{"mar", MONTH, 3},
{"march", MONTH, 3},
{"may", MONTH, 5},
{"mdt", DTZ, NEG(36)}, /* Mountain Daylight Time */
{"mest", DTZ, 12}, /* Middle Europe Summer Time */
{"met", TZ, 6}, /* Middle Europe Time */
{"metdst", DTZ, 12}, /* Middle Europe Daylight Time */
{"mewt", TZ, 6}, /* Middle Europe Winter Time */
{"mez", TZ, 6}, /* Middle Europe Zone */
{"mon", DOW, 1},
{"monday", DOW, 1},
{"mst", TZ, NEG(42)}, /* Mountain Standard Time */
{"mt", TZ, 51}, /* Moluccas Time */
{"ndt", DTZ, NEG(15)}, /* Nfld. Daylight Time */
{"nft", TZ, NEG(21)}, /* Newfoundland Standard Time */
{"nor", TZ, 6}, /* Norway Standard Time */
{"nov", MONTH, 11},
{"november", MONTH, 11},
{NOW, RESERV, DTK_NOW}, /* current transaction time */
{"nst", TZ, NEG(21)}, /* Nfld. Standard Time */
{"nt", TZ, NEG(66)}, /* Nome Time */
{"nzdt", DTZ, 78}, /* New Zealand Daylight Time */
{"nzst", TZ, 72}, /* New Zealand Standard Time */
{"nzt", TZ, 72}, /* New Zealand Time */
{"oct", MONTH, 10},
{"october", MONTH, 10},
{"on", IGNORE, 0}, /* "on" (throwaway) */
{"pdt", DTZ, NEG(42)}, /* Pacific Daylight Time */
{"pm", AMPM, PM},
{"pst", TZ, NEG(48)}, /* Pacific Standard Time */
{"sadt", DTZ, 63}, /* S. Australian Dayl. Time */
{"sast", TZ, 57}, /* South Australian Std Time */
{"sat", DOW, 6},
{"saturday", DOW, 6},
{"sep", MONTH, 9},
{"sept", MONTH, 9},
{"september", MONTH, 9},
{"set", TZ, NEG(6)}, /* Seychelles Time ?? */
{"sst", DTZ, 12}, /* Swedish Summer Time */
{"sun", DOW, 0},
{"sunday", DOW, 0},
{"swt", TZ, 6}, /* Swedish Winter Time */
{"thu", DOW, 4},
{"thur", DOW, 4},
{"thurs", DOW, 4},
{"thursday", DOW, 4},
{TODAY, RESERV, DTK_TODAY}, /* midnight */
{TOMORROW, RESERV, DTK_TOMORROW}, /* tomorrow midnight */
{"tue", DOW, 2},
{"tues", DOW, 2},
{"tuesday", DOW, 2},
{"undefined", RESERV, DTK_INVALID}, /* "undefined" pre-v6.1 invalid
* time */
{"ut", TZ, 0},
{"utc", TZ, 0},
{"wadt", DTZ, 48}, /* West Australian DST */
{"wast", TZ, 42}, /* West Australian Std Time */
{"wat", TZ, NEG(6)}, /* West Africa Time */
{"wdt", DTZ, 54}, /* West Australian DST */
{"wed", DOW, 3},
{"wednesday", DOW, 3},
{"weds", DOW, 3},
{"wet", TZ, 0}, /* Western Europe */
{"wetdst", DTZ, 6}, /* Western Europe */
{"wst", TZ, 48}, /* West Australian Std Time */
{"ydt", DTZ, NEG(48)}, /* Yukon Daylight Time */
{YESTERDAY, RESERV, DTK_YESTERDAY}, /* yesterday midnight */
{"yst", TZ, NEG(54)}, /* Yukon Standard Time */
{"zp4", TZ, NEG(24)}, /* GMT +4 hours. */
{"zp5", TZ, NEG(30)}, /* GMT +5 hours. */
{"zp6", TZ, NEG(36)}, /* GMT +6 hours. */
{"z", RESERV, DTK_ZULU}, /* 00:00:00 */
{ZULU, RESERV, DTK_ZULU}, /* 00:00:00 */
};
static unsigned int szdatetktbl = sizeof datetktbl / sizeof datetktbl[0];
static datetkn deltatktbl[] = {
/* text token lexval */
{"@", IGNORE, 0}, /* postgres relative time prefix */
{DAGO, AGO, 0}, /* "ago" indicates negative time offset */
{"c", UNITS, DTK_CENTURY}, /* "century" relative time units */
{"cent", UNITS, DTK_CENTURY}, /* "century" relative time units */
{"centuries", UNITS, DTK_CENTURY}, /* "centuries" relative time units */
{DCENTURY, UNITS, DTK_CENTURY}, /* "century" relative time units */
{"d", UNITS, DTK_DAY}, /* "day" relative time units */
{DDAY, UNITS, DTK_DAY}, /* "day" relative time units */
{"days", UNITS, DTK_DAY}, /* "days" relative time units */
{"dec", UNITS, DTK_DECADE}, /* "decade" relative time units */
{"decs", UNITS, DTK_DECADE},/* "decades" relative time units */
{DDECADE, UNITS, DTK_DECADE}, /* "decade" relative time units */
{"decades", UNITS, DTK_DECADE}, /* "decades" relative time units */
{"h", UNITS, DTK_HOUR}, /* "hour" relative time units */
{DHOUR, UNITS, DTK_HOUR}, /* "hour" relative time units */
{"hours", UNITS, DTK_HOUR}, /* "hours" relative time units */
{"hr", UNITS, DTK_HOUR}, /* "hour" relative time units */
{"hrs", UNITS, DTK_HOUR}, /* "hours" relative time units */
{INVALID, RESERV, DTK_INVALID}, /* "invalid" reserved for invalid
* time */
{"m", UNITS, DTK_MINUTE}, /* "minute" relative time units */
{"microsecon", UNITS, DTK_MICROSEC}, /* "microsecond" relative
* time units */
{"mil", UNITS, DTK_MILLENIUM}, /* "millenium" relative time units */
{"mils", UNITS, DTK_MILLENIUM}, /* "millenia" relative time units */
{"millenia", UNITS, DTK_MILLENIUM}, /* "millenia" relative time units */
{DMILLENIUM, UNITS, DTK_MILLENIUM}, /* "millenium" relative time units */
{"millisecon", UNITS, DTK_MILLISEC}, /* relative time units */
{"min", UNITS, DTK_MINUTE}, /* "minute" relative time units */
{"mins", UNITS, DTK_MINUTE},/* "minutes" relative time units */
{"mins", UNITS, DTK_MINUTE},/* "minutes" relative time units */
{DMINUTE, UNITS, DTK_MINUTE}, /* "minute" relative time units */
{"minutes", UNITS, DTK_MINUTE}, /* "minutes" relative time units */
{"mon", UNITS, DTK_MONTH}, /* "months" relative time units */
{"mons", UNITS, DTK_MONTH}, /* "months" relative time units */
{DMONTH, UNITS, DTK_MONTH}, /* "month" relative time units */
{"months", UNITS, DTK_MONTH},
{"ms", UNITS, DTK_MILLISEC},
{"msec", UNITS, DTK_MILLISEC},
{DMILLISEC, UNITS, DTK_MILLISEC},
{"mseconds", UNITS, DTK_MILLISEC},
{"msecs", UNITS, DTK_MILLISEC},
{"qtr", UNITS, DTK_QUARTER},/* "quarter" relative time */
{DQUARTER, UNITS, DTK_QUARTER}, /* "quarter" relative time */
{"reltime", IGNORE, 0}, /* for pre-v6.1 "Undefined Reltime" */
{"s", UNITS, DTK_SECOND},
{"sec", UNITS, DTK_SECOND},
{DSECOND, UNITS, DTK_SECOND},
{"seconds", UNITS, DTK_SECOND},
{"secs", UNITS, DTK_SECOND},
{DTIMEZONE, UNITS, DTK_TZ}, /* "timezone" time offset */
{"tz", UNITS, DTK_TZ}, /* "timezone" time offset */
{"tz_hour", UNITS, DTK_TZ_HOUR}, /* timezone hour units */
{"tz_minute", UNITS, DTK_TZ_MINUTE}, /* timezone minutes units */
{"undefined", RESERV, DTK_INVALID}, /* pre-v6.1 invalid time */
{"us", UNITS, DTK_MICROSEC},/* "microsecond" relative time units */
{"usec", UNITS, DTK_MICROSEC}, /* "microsecond" relative time
* units */
{DMICROSEC, UNITS, DTK_MICROSEC}, /* "microsecond" relative time
* units */
{"useconds", UNITS, DTK_MICROSEC}, /* "microseconds" relative time
* units */
{"usecs", UNITS, DTK_MICROSEC}, /* "microseconds" relative time
* units */
{"w", UNITS, DTK_WEEK}, /* "week" relative time units */
{DWEEK, UNITS, DTK_WEEK}, /* "week" relative time units */
{"weeks", UNITS, DTK_WEEK}, /* "weeks" relative time units */
{"y", UNITS, DTK_YEAR}, /* "year" relative time units */
{DYEAR, UNITS, DTK_YEAR}, /* "year" relative time units */
{"years", UNITS, DTK_YEAR}, /* "years" relative time units */
{"yr", UNITS, DTK_YEAR}, /* "year" relative time units */
{"yrs", UNITS, DTK_YEAR}, /* "years" relative time units */
};
static unsigned int szdeltatktbl = sizeof deltatktbl / sizeof deltatktbl[0];
#if USE_DATE_CACHE
datetkn *datecache[MAXDATEFIELDS] = {NULL};
datetkn *deltacache[MAXDATEFIELDS] = {NULL};
#endif
/*
* Calendar time to Julian date conversions.
* Julian date is commonly used in astronomical applications,
* since it is numerically accurate and computationally simple.
* The algorithms here will accurately convert between Julian day
* and calendar date for all non-negative Julian days
* (i.e. from Nov 23, -4713 on).
*
* Ref: Explanatory Supplement to the Astronomical Almanac, 1992.
* University Science Books, 20 Edgehill Rd. Mill Valley CA 94941.
*
* Use the algorithm by Henry Fliegel, a former NASA/JPL colleague
* now at Aerospace Corp. (hi, Henry!)
*
* These routines will be used by other date/time packages - tgl 97/02/25
*/
#if 0
XXX moved to dt.h - thomas 1999-01-15
/* Set the minimum year to one greater than the year of the first valid day
* to avoid having to check year and day both. - tgl 97/05/08
*/
#define JULIAN_MINYEAR (-4713)
#define JULIAN_MINMONTH (11)
#define JULIAN_MINDAY (23)
#define IS_VALID_JULIAN(y,m,d) ((y > JULIAN_MINYEAR) \
|| ((y == JULIAN_MINYEAR) && ((m > JULIAN_MINMONTH) \
|| ((m == JULIAN_MINMONTH) && (d >= JULIAN_MINDAY)))))
#endif
int
date2j(int y, int m, int d)
{
int m12 = (m - 14) / 12;
return ((1461 * (y + 4800 + m12)) / 4 + (367 * (m - 2 - 12 * (m12))) / 12
- (3 * ((y + 4900 + m12) / 100)) / 4 + d - 32075);
} /* date2j() */
void
j2date(int jd, int *year, int *month, int *day)
{
int j,
y,
m,
d;
int i,
l,
n;
l = jd + 68569;
n = (4 * l) / 146097;
l -= (146097 * n + 3) / 4;
i = (4000 * (l + 1)) / 1461001;
l += 31 - (1461 * i) / 4;
j = (80 * l) / 2447;
d = l - (2447 * j) / 80;
l = j / 11;
m = (j + 2) - (12 * l);
y = 100 * (n - 49) + i + l;
*year = y;
*month = m;
*day = d;
return;
} /* j2date() */
static int
j2day(int date)
{
int day;
day = (date + 1) % 7;
return day;
} /* j2day() */
/* datetime2tm()
* Convert datetime data type to POSIX time structure.
* Note that year is _not_ 1900-based, but is an explicit full value.
* Also, month is one-based, _not_ zero-based.
* Returns:
* 0 on success
* -1 on out of range
*
* For dates within the system-supported time_t range, convert to the
* local time zone. If out of this range, leave as GMT. - tgl 97/05/27
*/
int
datetime2tm(DateTime dt, int *tzp, struct tm * tm, double *fsec, char **tzn)
{
double date,
date0,
time,
sec;
time_t utime;
#ifdef USE_POSIX_TIME
struct tm *tx;
#endif
date0 = date2j(2000, 1, 1);
time = dt;
TMODULO(time, date, 86400e0);
if (time < 0)
{
time += 86400;
date -= 1;
}
/* Julian day routine does not work for negative Julian days */
if (date < -date0)
return -1;
/* add offset to go from J2000 back to standard Julian date */
date += date0;
#ifdef DATEDEBUG
printf("datetime2tm- date is %f (%f %f)\n", dt, date, time);
#endif
j2date((int) date, &tm->tm_year, &tm->tm_mon, &tm->tm_mday);
dt2time(time, &tm->tm_hour, &tm->tm_min, &sec);
#ifdef DATEDEBUG
printf("datetime2tm- date is %d.%02d.%02d\n", tm->tm_year, tm->tm_mon, tm->tm_mday);
printf("datetime2tm- time is %02d:%02d:%02.0f\n", tm->tm_hour, tm->tm_min, sec);
#endif
*fsec = JROUND(sec);
TMODULO(*fsec, tm->tm_sec, 1e0);
#ifdef DATEDEBUG
printf("datetime2tm- time is %02d:%02d:%02d %.7f\n", tm->tm_hour, tm->tm_min, tm->tm_sec, *fsec);
#endif
if (tzp != NULL)
{
if (IS_VALID_UTIME(tm->tm_year, tm->tm_mon, tm->tm_mday))
{
utime = (dt + (date0 - date2j(1970, 1, 1)) * 86400);
#ifdef USE_POSIX_TIME
tx = localtime(&utime);
#ifdef DATEDEBUG
#if defined(HAVE_TM_ZONE)
printf("datetime2tm- (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, sec,
tx->tm_zone, tx->tm_isdst);
#elif defined(HAVE_INT_TIMEZONE)
printf("datetime2tm- (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, sec,
tzname[0], tzname[1], tx->tm_isdst);
#else
#error USE_POSIX_TIME is defined but neither HAVE_TM_ZONE or HAVE_INT_TIMEZONE are defined
#endif
#endif
tm->tm_year = tx->tm_year + 1900;
tm->tm_mon = tx->tm_mon + 1;
tm->tm_mday = tx->tm_mday;
tm->tm_hour = tx->tm_hour;
tm->tm_min = tx->tm_min;
#if NOT_USED
/* XXX HACK
* Argh! My Linux box puts in a 1 second offset for dates less than 1970
* but only if the seconds field was non-zero. So, don't copy the seconds
* field and instead carry forward from the original - tgl 97/06/18
* Note that GNU/Linux uses the standard freeware zic package as do
* many other platforms so this may not be GNU/Linux/ix86-specific.
*/
tm->tm_sec = tx->tm_sec;
#endif
tm->tm_isdst = tx->tm_isdst;
#if defined(HAVE_TM_ZONE)
tm->tm_gmtoff = tx->tm_gmtoff;
tm->tm_zone = tx->tm_zone;
*tzp = -(tm->tm_gmtoff); /* tm_gmtoff is Sun/DEC-ism */
if (tzn != NULL)
*tzn = (char *)tm->tm_zone;
#elif defined(HAVE_INT_TIMEZONE)
*tzp = (tm->tm_isdst ? (timezone - 3600) : timezone);
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
}
else
{
*tzp = 0;
tm->tm_isdst = 0;
if (tzn != NULL)
*tzn = NULL;
}
dt = dt2local(dt, *tzp);
}
else
{
tm->tm_isdst = 0;
if (tzn != NULL)
*tzn = NULL;
}
#ifdef DATEDEBUG
printf("datetime2tm- date is %d.%02d.%02d\n", tm->tm_year, tm->tm_mon, tm->tm_mday);
printf("datetime2tm- time is %02d:%02d:%02d %.7f\n", tm->tm_hour, tm->tm_min, tm->tm_sec, *fsec);
#endif
#ifdef DATEDEBUG
#ifdef USE_POSIX_TIME
#if defined(HAVE_TM_ZONE)
printf("datetime2tm- timezone is %s; offset is %d\n",
tm->tm_zone, ((tzp != NULL) ? *tzp : 0));
#elif defined(HAVE_INT_TIMEZONE)
printf("datetime2tm- timezone is %s; offset is %d (%d); daylight is %d\n",
tzname[tm->tm_isdst != 0], ((tzp != NULL) ? *tzp : 0), CTimeZone, CDayLight);
#endif
#endif
#endif
return 0;
} /* datetime2tm() */
/* tm2datetime()
* Convert a tm structure to a datetime data type.
* Note that year is _not_ 1900-based, but is an explicit full value.
* Also, month is one-based, _not_ zero-based.
*/
int
tm2datetime(struct tm * tm, double fsec, int *tzp, DateTime *result)
{
double date,
time;
/* Julian day routines are not correct for negative Julian days */
if (!IS_VALID_JULIAN(tm->tm_year, tm->tm_mon, tm->tm_mday))
return -1;
date = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - date2j(2000, 1, 1);
time = time2t(tm->tm_hour, tm->tm_min, (tm->tm_sec + fsec));
*result = (date * 86400 + time);
#ifdef DATEDEBUG
printf("tm2datetime- date is %f (%f %f %d)\n", *result, date, time, (((tm->tm_hour * 60) + tm->tm_min) * 60 + tm->tm_sec));
printf("tm2datetime- time is %f %02d:%02d:%02d %f\n", time, tm->tm_hour, tm->tm_min, tm->tm_sec, fsec);
#endif
if (tzp != NULL)
*result = dt2local(*result, -(*tzp));
return 0;
} /* tm2datetime() */
/* timespan2tm()
* Convert a timespan data type to a tm structure.
*/
static int
timespan2tm(TimeSpan span, struct tm * tm, float8 *fsec)
{
double time;
if (span.month != 0)
{
tm->tm_year = span.month / 12;
tm->tm_mon = span.month % 12;
}
else
{
tm->tm_year = 0;
tm->tm_mon = 0;
}
#ifdef ROUND_ALL
time = JROUND(span.time);
#else
time = span.time;
#endif
TMODULO(time, tm->tm_mday, 86400e0);
TMODULO(time, tm->tm_hour, 3600e0);
TMODULO(time, tm->tm_min, 60e0);
TMODULO(time, tm->tm_sec, 1e0);
*fsec = time;
#ifdef DATEDEBUG
printf("timespan2tm- %d %f = %04d-%02d-%02d %02d:%02d:%02d %.2f\n", span.month, span.time,
tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec, *fsec);
#endif
return 0;
} /* timespan2tm() */
static int
tm2timespan(struct tm * tm, double fsec, TimeSpan *span)
{
span->month = ((tm->tm_year * 12) + tm->tm_mon);
span->time = ((((((tm->tm_mday * 24) + tm->tm_hour) * 60) + tm->tm_min) * 60) + tm->tm_sec);
span->time = JROUND(span->time + fsec);
#ifdef DATEDEBUG
printf("tm2timespan- %d %f = %04d-%02d-%02d %02d:%02d:%02d %.2f\n", span->month, span->time,
tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec, fsec);
#endif
return 0;
} /* tm2timespan() */
static DateTime
dt2local(DateTime dt, int tz)
{
dt -= tz;
dt = JROUND(dt);
return dt;
} /* dt2local() */
static double
time2t(const int hour, const int min, const double sec)
{
return (((hour * 60) + min) * 60) + sec;
} /* time2t() */
static void
dt2time(DateTime jd, int *hour, int *min, double *sec)
{
double time;
time = jd;
*hour = (time / 3600);
time -= ((*hour) * 3600);
*min = (time / 60);
time -= ((*min) * 60);
*sec = JROUND(time);
return;
} /* dt2time() */
/*
* parse and convert date in timestr (the normal interface)
*
* Returns the number of seconds since epoch (J2000)
*/
/* ParseDateTime()
* Break string into tokens based on a date/time context.
*/
int
ParseDateTime(char *timestr, char *lowstr,
char **field, int *ftype, int maxfields, int *numfields)
{
int nf = 0;
char *cp = timestr;
char *lp = lowstr;
#ifdef DATEDEBUG
printf("ParseDateTime- input string is %s\n", timestr);
#endif
/* outer loop through fields */
while (*cp != '\0')
{
field[nf] = lp;
/* leading digit? then date or time */
if (isdigit(*cp) || (*cp == '.'))
{
*lp++ = *cp++;
while (isdigit(*cp))
*lp++ = *cp++;
/* time field? */
if (*cp == ':')
{
ftype[nf] = DTK_TIME;
while (isdigit(*cp) || (*cp == ':') || (*cp == '.'))
*lp++ = *cp++;
}
/* date field? allow embedded text month */
else if ((*cp == '-') || (*cp == '/') || (*cp == '.'))
{
ftype[nf] = DTK_DATE;
while (isalnum(*cp) || (*cp == '-') || (*cp == '/') || (*cp == '.'))
*lp++ = tolower(*cp++);
}
/*
* otherwise, number only and will determine year, month, or
* day later
*/
else
ftype[nf] = DTK_NUMBER;
}
/*
* text? then date string, month, day of week, special, or
* timezone
*/
else if (isalpha(*cp))
{
ftype[nf] = DTK_STRING;
*lp++ = tolower(*cp++);
while (isalpha(*cp))
*lp++ = tolower(*cp++);
/* full date string with leading text month? */
if ((*cp == '-') || (*cp == '/') || (*cp == '.'))
{
ftype[nf] = DTK_DATE;
while (isdigit(*cp) || (*cp == '-') || (*cp == '/') || (*cp == '.'))
*lp++ = tolower(*cp++);
}
/* skip leading spaces */
}
else if (isspace(*cp))
{
cp++;
continue;
/* sign? then special or numeric timezone */
}
else if ((*cp == '+') || (*cp == '-'))
{
*lp++ = *cp++;
/* soak up leading whitespace */
while (isspace(*cp))
cp++;
/* numeric timezone? */
if (isdigit(*cp))
{
ftype[nf] = DTK_TZ;
*lp++ = *cp++;
while (isdigit(*cp) || (*cp == ':'))
*lp++ = *cp++;
/* special? */
}
else if (isalpha(*cp))
{
ftype[nf] = DTK_SPECIAL;
*lp++ = tolower(*cp++);
while (isalpha(*cp))
*lp++ = tolower(*cp++);
/* otherwise something wrong... */
}
else
return -1;
/* ignore punctuation but use as delimiter */
}
else if (ispunct(*cp))
{
cp++;
continue;
}
else
return -1;
/* force in a delimiter */
*lp++ = '\0';
nf++;
if (nf > MAXDATEFIELDS)
return -1;
#ifdef DATEDEBUG
printf("ParseDateTime- set field[%d] to %s type %d\n", (nf - 1), field[nf - 1], ftype[nf - 1]);
#endif
}
*numfields = nf;
return 0;
} /* ParseDateTime() */
/* DecodeDateTime()
* Interpret previously parsed fields for general date and time.
* Return 0 if full date, 1 if only time, and -1 if problems.
* External format(s):
* "<weekday> <month>-<day>-<year> <hour>:<minute>:<second>"
* "Fri Feb-7-1997 15:23:27"
* "Feb-7-1997 15:23:27"
* "2-7-1997 15:23:27"
* "1997-2-7 15:23:27"
* "1997.038 15:23:27" (day of year 1-366)
* Also supports input in compact time:
* "970207 152327"
* "97038 152327"
*
* Use the system-provided functions to get the current time zone
* if not specified in the input string.
* If the date is outside the time_t system-supported time range,
* then assume GMT time zone. - tgl 97/05/27
*/
int
DecodeDateTime(char **field, int *ftype, int nf,
int *dtype, struct tm * tm, double *fsec, int *tzp)
{
int fmask = 0,
tmask,
type;
int i;
int flen,
val;
int mer = HR24;
int haveTextMonth = FALSE;
int is2digits = FALSE;
int bc = FALSE;
*dtype = DTK_DATE;
tm->tm_hour = 0;
tm->tm_min = 0;
tm->tm_sec = 0;
*fsec = 0;
tm->tm_isdst = -1; /* don't know daylight savings time status
* apriori */
if (tzp != NULL)
*tzp = 0;
for (i = 0; i < nf; i++)
{
#ifdef DATEDEBUG
printf("DecodeDateTime- field[%d] is %s (type %d)\n", i, field[i], ftype[i]);
#endif
switch (ftype[i])
{
case DTK_DATE:
if (DecodeDate(field[i], fmask, &tmask, tm) != 0)
return -1;
break;
case DTK_TIME:
if (DecodeTime(field[i], fmask, &tmask, tm, fsec) != 0)
return -1;
/*
* check upper limit on hours; other limits checked in
* DecodeTime()
*/
if (tm->tm_hour > 23)
return -1;
break;
case DTK_TZ:
if (tzp == NULL)
return -1;
if (DecodeTimezone(field[i], tzp) != 0)
return -1;
tmask = DTK_M(TZ);
break;
case DTK_NUMBER:
flen = strlen(field[i]);
/* long numeric string and either no date or no time read yet?
* then interpret as a concatenated date or time... */
if ((flen > 4) && !((fmask & DTK_DATE_M) && (fmask & DTK_TIME_M)))
{
if (DecodeNumberField(flen, field[i], fmask, &tmask, tm, fsec, &is2digits) != 0)
return -1;
}
/* otherwise it is a single date/time field... */
else
{
if (DecodeNumber(flen, field[i], fmask, &tmask, tm, fsec, &is2digits) != 0)
return -1;
}
break;
case DTK_STRING:
case DTK_SPECIAL:
type = DecodeSpecial(i, field[i], &val);
#ifdef DATEDEBUG
printf("DecodeDateTime- special field[%d] %s type=%d value=%d\n", i, field[i], type, val);
#endif
if (type == IGNORE)
continue;
tmask = DTK_M(type);
switch (type)
{
case RESERV:
#ifdef DATEDEBUG
printf("DecodeDateTime- RESERV field %s value is %d\n", field[i], val);
#endif
switch (val)
{
case DTK_NOW:
tmask = (DTK_DATE_M | DTK_TIME_M | DTK_M(TZ));
*dtype = DTK_DATE;
GetCurrentTime(tm);
if (tzp != NULL)
*tzp = CTimeZone;
break;
case DTK_YESTERDAY:
tmask = DTK_DATE_M;
*dtype = DTK_DATE;
GetCurrentTime(tm);
j2date((date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - 1),
&tm->tm_year, &tm->tm_mon, &tm->tm_mday);
tm->tm_hour = 0;
tm->tm_min = 0;
tm->tm_sec = 0;
break;
case DTK_TODAY:
tmask = DTK_DATE_M;
*dtype = DTK_DATE;
GetCurrentTime(tm);
tm->tm_hour = 0;
tm->tm_min = 0;
tm->tm_sec = 0;
break;
case DTK_TOMORROW:
tmask = DTK_DATE_M;
*dtype = DTK_DATE;
GetCurrentTime(tm);
j2date((date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) + 1),
&tm->tm_year, &tm->tm_mon, &tm->tm_mday);
tm->tm_hour = 0;
tm->tm_min = 0;
tm->tm_sec = 0;
break;
case DTK_ZULU:
tmask = (DTK_TIME_M | DTK_M(TZ));
*dtype = DTK_DATE;
tm->tm_hour = 0;
tm->tm_min = 0;
tm->tm_sec = 0;
if (tzp != NULL)
*tzp = 0;
break;
default:
*dtype = val;
}
break;
case MONTH:
#ifdef DATEDEBUG
printf("DecodeDateTime- month field %s value is %d\n", field[i], val);
#endif
/* already have a (numeric) month? then see if we can substitute... */
if ((fmask & DTK_M(MONTH)) && (! haveTextMonth)
&& (!(fmask & DTK_M(DAY)))
&& ((tm->tm_mon >= 1) && (tm->tm_mon <= 31)))
{
tm->tm_mday = tm->tm_mon;
tmask = DTK_M(DAY);
#ifdef DATEDEBUG
printf("DecodeNumber- misidentified month previously; assign as day %d\n", tm->tm_mday);
#endif
}
haveTextMonth = TRUE;
tm->tm_mon = val;
break;
case DTZMOD:
/* daylight savings time modifier (solves "MET DST" syntax) */
tmask |= DTK_M(DTZ);
tm->tm_isdst = 1;
if (tzp == NULL)
return -1;
*tzp += val * 60;
break;
case DTZ:
/*
* set mask for TZ here _or_ check for DTZ later
* when getting default timezone
*/
tmask |= DTK_M(TZ);
tm->tm_isdst = 1;
if (tzp == NULL)
return -1;
*tzp = val * 60;
break;
case TZ:
tm->tm_isdst = 0;
if (tzp == NULL)
return -1;
*tzp = val * 60;
break;
case IGNORE:
break;
case AMPM:
mer = val;
break;
case ADBC:
bc = (val == BC);
break;
case DOW:
tm->tm_wday = val;
break;
default:
return -1;
}
break;
default:
return -1;
}
#ifdef DATEDEBUG
printf("DecodeDateTime- field[%d] %s (%08x/%08x) value is %d\n",
i, field[i], fmask, tmask, val);
#endif
if (tmask & fmask)
return -1;
fmask |= tmask;
}
/* there is no year zero in AD/BC notation; i.e. "1 BC" == year 0 */
if (bc)
{
if (tm->tm_year > 0)
tm->tm_year = -(tm->tm_year - 1);
else
elog(ERROR,"Inconsistant use of year %04d and 'BC'", tm->tm_year);
}
else if (is2digits)
{
if (tm->tm_year < 70)
tm->tm_year += 2000;
else if (tm->tm_year < 100)
tm->tm_year += 1900;
}
if ((mer != HR24) && (tm->tm_hour > 12))
return -1;
if ((mer == AM) && (tm->tm_hour == 12))
tm->tm_hour = 0;
else if ((mer == PM) && (tm->tm_hour != 12))
tm->tm_hour += 12;
#ifdef DATEDEBUG
printf("DecodeDateTime- mask %08x (%08x)", fmask, DTK_DATE_M);
printf(" set y%04d m%02d d%02d", tm->tm_year, tm->tm_mon, tm->tm_mday);
printf(" %02d:%02d:%02d\n", tm->tm_hour, tm->tm_min, tm->tm_sec);
#endif
if ((*dtype == DTK_DATE) && ((fmask & DTK_DATE_M) != DTK_DATE_M))
return ((fmask & DTK_TIME_M) == DTK_TIME_M) ? 1 : -1;
/* timezone not specified? then find local timezone if possible */
if ((*dtype == DTK_DATE) && ((fmask & DTK_DATE_M) == DTK_DATE_M)
&& (tzp != NULL) && (!(fmask & DTK_M(TZ))))
{
/*
* daylight savings time modifier but no standard timezone? then
* error
*/
if (fmask & DTK_M(DTZMOD))
return -1;
if (IS_VALID_UTIME(tm->tm_year, tm->tm_mon, tm->tm_mday))
{
#ifdef USE_POSIX_TIME
tm->tm_year -= 1900;
tm->tm_mon -= 1;
tm->tm_isdst = -1;
mktime(tm);
tm->tm_year += 1900;
tm->tm_mon += 1;
#if defined(HAVE_TM_ZONE)
*tzp = -(tm->tm_gmtoff); /* tm_gmtoff is Sun/DEC-ism */
#elif defined(HAVE_INT_TIMEZONE)
*tzp = ((tm->tm_isdst > 0) ? (timezone - 3600) : timezone);
#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;
#endif
}
else
{
tm->tm_isdst = 0;
*tzp = 0;
}
}
return 0;
} /* DecodeDateTime() */
/* DecodeTimeOnly()
* Interpret parsed string as time fields only.
*/
int
DecodeTimeOnly(char **field, int *ftype, int nf, int *dtype, struct tm * tm, double *fsec)
{
int fmask,
tmask,
type;
int i;
int flen,
val;
int is2digits = FALSE;
int mer = HR24;
*dtype = DTK_TIME;
tm->tm_hour = 0;
tm->tm_min = 0;
tm->tm_sec = 0;
tm->tm_isdst = -1; /* don't know daylight savings time status
* apriori */
*fsec = 0;
fmask = DTK_DATE_M;
for (i = 0; i < nf; i++)
{
#ifdef DATEDEBUG
printf("DecodeTimeOnly- field[%d] is %s (type %d)\n", i, field[i], ftype[i]);
#endif
switch (ftype[i])
{
case DTK_TIME:
if (DecodeTime(field[i], fmask, &tmask, tm, fsec) != 0)
return -1;
break;
case DTK_NUMBER:
flen = strlen(field[i]);
if (DecodeNumberField(flen, field[i], fmask, &tmask, tm, fsec, &is2digits) != 0)
return -1;
break;
case DTK_STRING:
case DTK_SPECIAL:
type = DecodeSpecial(i, field[i], &val);
#ifdef DATEDEBUG
printf("DecodeTimeOnly- special field[%d] %s type=%d value=%d\n", i, field[i], type, val);
#endif
if (type == IGNORE)
continue;
tmask = DTK_M(type);
switch (type)
{
case RESERV:
#ifdef DATEDEBUG
printf("DecodeTimeOnly- RESERV field %s value is %d\n", field[i], val);
#endif
switch (val)
{
case DTK_NOW:
tmask = DTK_TIME_M;
*dtype = DTK_TIME;
GetCurrentTime(tm);
break;
case DTK_ZULU:
tmask = (DTK_TIME_M | DTK_M(TZ));
*dtype = DTK_TIME;
tm->tm_hour = 0;
tm->tm_min = 0;
tm->tm_sec = 0;
tm->tm_isdst = 0;
break;
default:
return -1;
}
break;
case IGNORE:
break;
case AMPM:
mer = val;
break;
default:
return -1;
}
break;
default:
return -1;
}
if (tmask & fmask)
return -1;
fmask |= tmask;
#ifdef DATEDEBUG
printf("DecodeTimeOnly- field[%d] %s value is %d\n", i, field[i], val);
#endif
}
#ifdef DATEDEBUG
printf("DecodeTimeOnly- mask %08x (%08x)", fmask, DTK_TIME_M);
printf(" %02d:%02d:%02d (%f)\n", tm->tm_hour, tm->tm_min, tm->tm_sec, *fsec);
#endif
if ((mer != HR24) && (tm->tm_hour > 12))
return -1;
if ((mer == AM) && (tm->tm_hour == 12))
tm->tm_hour = 0;
else if ((mer == PM) && (tm->tm_hour != 12))
tm->tm_hour += 12;
if ((fmask & DTK_TIME_M) != DTK_TIME_M)
return -1;
return 0;
} /* DecodeTimeOnly() */
/* DecodeDate()
* Decode date string which includes delimiters.
* Insist on a complete set of fields.
*/
static int
DecodeDate(char *str, int fmask, int *tmask, struct tm * tm)
{
double fsec;
int nf = 0;
int i,
len;
int bc = FALSE;
int is2digits = FALSE;
int type,
val,
dmask = 0;
char *field[MAXDATEFIELDS];
/* parse this string... */
while ((*str != '\0') && (nf < MAXDATEFIELDS))
{
/* skip field separators */
while (!isalnum(*str))
str++;
field[nf] = str;
if (isdigit(*str))
{
while (isdigit(*str))
str++;
}
else if (isalpha(*str))
{
while (isalpha(*str))
str++;
}
if (*str != '\0')
*str++ = '\0';
nf++;
}
#if 0
/* don't allow too many fields */
if (nf > 3)
return -1;
#endif
*tmask = 0;
/* look first for text fields, since that will be unambiguous month */
for (i = 0; i < nf; i++)
{
if (isalpha(*field[i]))
{
type = DecodeSpecial(i, field[i], &val);
if (type == IGNORE)
continue;
dmask = DTK_M(type);
switch (type)
{
case MONTH:
#ifdef DATEDEBUG
printf("DecodeDate- month field %s value is %d\n", field[i], val);
#endif
tm->tm_mon = val;
break;
case ADBC:
bc = (val == BC);
break;
default:
#ifdef DATEDEBUG
printf("DecodeDate- illegal field %s value is %d\n", field[i], val);
#endif
return -1;
}
if (fmask & dmask)
return -1;
fmask |= dmask;
*tmask |= dmask;
/* mark this field as being completed */
field[i] = NULL;
}
}
/* now pick up remaining numeric fields */
for (i = 0; i < nf; i++)
{
if (field[i] == NULL)
continue;
if ((len = strlen(field[i])) <= 0)
return -1;
if (DecodeNumber(len, field[i], fmask, &dmask, tm, &fsec, &is2digits) != 0)
return -1;
if (fmask & dmask)
return -1;
fmask |= dmask;
*tmask |= dmask;
}
if ((fmask & ~(DTK_M(DOY) | DTK_M(TZ))) != DTK_DATE_M)
return -1;
/* there is no year zero in AD/BC notation; i.e. "1 BC" == year 0 */
if (bc)
{
if (tm->tm_year > 0)
tm->tm_year = -(tm->tm_year - 1);
else
elog(ERROR,"Inconsistant use of year %04d and 'BC'", tm->tm_year);
}
else if (is2digits)
{
if (tm->tm_year < 70)
tm->tm_year += 2000;
else if (tm->tm_year < 100)
tm->tm_year += 1900;
}
return 0;
} /* DecodeDate() */
/* DecodeTime()
* Decode time string which includes delimiters.
* Only check the lower limit on hours, since this same code
* can be used to represent time spans.
*/
static int
DecodeTime(char *str, int fmask, int *tmask, struct tm * tm, double *fsec)
{
char *cp;
*tmask = DTK_TIME_M;
tm->tm_hour = strtol(str, &cp, 10);
if (*cp != ':')
return -1;
str = cp + 1;
tm->tm_min = strtol(str, &cp, 10);
if (*cp == '\0')
{
tm->tm_sec = 0;
*fsec = 0;
}
else if (*cp != ':')
{
return -1;
}
else
{
str = cp + 1;
tm->tm_sec = strtol(str, &cp, 10);
if (*cp == '\0')
*fsec = 0;
else if (*cp == '.')
{
str = cp;
*fsec = strtod(str, &cp);
if (cp == str)
return -1;
}
else
return -1;
}
/* do a sanity check */
if ((tm->tm_hour < 0)
|| (tm->tm_min < 0) || (tm->tm_min > 59)
|| (tm->tm_sec < 0) || (tm->tm_sec > 59))
return -1;
return 0;
} /* DecodeTime() */
/* DecodeNumber()
* Interpret numeric field as a date value in context.
*/
static int
DecodeNumber(int flen, char *str, int fmask,
int *tmask, struct tm * tm, double *fsec, int *is2digits)
{
int val;
char *cp;
*tmask = 0;
val = strtol(str, &cp, 10);
if (cp == str)
return -1;
if (*cp == '.')
{
*fsec = strtod(cp, &cp);
if (*cp != '\0')
return -1;
}
#ifdef DATEDEBUG
printf("DecodeNumber- %s is %d fmask=%08x tmask=%08x\n", str, val, fmask, *tmask);
#endif
/* Special case day of year? */
if ((flen == 3) && (fmask & DTK_M(YEAR))
&& ((val >= 1) && (val <= 366)))
{
*tmask = (DTK_M(DOY) | DTK_M(MONTH) | DTK_M(DAY));
tm->tm_yday = val;
j2date((date2j(tm->tm_year, 1, 1) + tm->tm_yday - 1),
&tm->tm_year, &tm->tm_mon, &tm->tm_mday);
}
/* Enough digits to be unequivocal year?
* Used to test for 4 digits or more,
* but we now test first for a three-digit doy
* so anything bigger than two digits had better be
* an explicit year. - thomas 1999-01-09
*/
else if (flen > 2)
{
#ifdef DATEDEBUG
printf("DecodeNumber- match %d (%s) as year\n", val, str);
#endif
*tmask = DTK_M(YEAR);
/* already have a year? then see if we can substitute... */
if ((fmask & DTK_M(YEAR)) && (!(fmask & DTK_M(DAY)))
&& ((tm->tm_year >= 1) && (tm->tm_year <= 31)))
{
tm->tm_mday = tm->tm_year;
*tmask = DTK_M(DAY);
#ifdef DATEDEBUG
printf("DecodeNumber- misidentified year previously; assign as day %d\n", tm->tm_mday);
#endif
}
tm->tm_year = val;
}
/* already have year? then could be month */
else if ((fmask & DTK_M(YEAR)) && (!(fmask & DTK_M(MONTH)))
&& ((val >= 1) && (val <= 12)))
{
#ifdef DATEDEBUG
printf("DecodeNumber- match %d (%s) as month\n", val, str);
#endif
*tmask = DTK_M(MONTH);
tm->tm_mon = val;
/* no year and EuroDates enabled? then could be day */
}
else if ((EuroDates || (fmask & DTK_M(MONTH)))
&& (!(fmask & DTK_M(YEAR)) && !(fmask & DTK_M(DAY)))
&& ((val >= 1) && (val <= 31)))
{
#ifdef DATEDEBUG
printf("DecodeNumber- match %d (%s) as day\n", val, str);
#endif
*tmask = DTK_M(DAY);
tm->tm_mday = val;
}
else if ((!(fmask & DTK_M(MONTH)))
&& ((val >= 1) && (val <= 12)))
{
#ifdef DATEDEBUG
printf("DecodeNumber- (2) match %d (%s) as month\n", val, str);
#endif
*tmask = DTK_M(MONTH);
tm->tm_mon = val;
}
else if ((!(fmask & DTK_M(DAY)))
&& ((val >= 1) && (val <= 31)))
{
#ifdef DATEDEBUG
printf("DecodeNumber- (2) match %d (%s) as day\n", val, str);
#endif
*tmask = DTK_M(DAY);
tm->tm_mday = val;
}
else if (!(fmask & DTK_M(YEAR)))
{
#ifdef DATEDEBUG
printf("DecodeNumber- (2) match %d (%s) as year\n", val, str);
#endif
*tmask = DTK_M(YEAR);
tm->tm_year = val;
/* adjust ONLY if exactly two digits... */
#if 0
if (flen == 2)
{
if (tm->tm_year < 70)
tm->tm_year += 2000;
else if (tm->tm_year < 100)
tm->tm_year += 1900;
}
#endif
*is2digits = (flen == 2);
}
else
return -1;
return 0;
} /* DecodeNumber() */
/* DecodeNumberField()
* Interpret numeric string as a concatenated date field.
*/
static int
DecodeNumberField(int len, char *str, int fmask,
int *tmask, struct tm * tm, double *fsec, int *is2digits)
{
char *cp;
/* yyyymmdd? */
if (len == 8)
{
#ifdef DATEDEBUG
printf("DecodeNumberField- %s is 8 character date fmask=%08x tmask=%08x\n", str, fmask, *tmask);
#endif
*tmask = DTK_DATE_M;
tm->tm_mday = atoi(str + 6);
*(str + 6) = '\0';
tm->tm_mon = atoi(str + 4);
*(str + 4) = '\0';
tm->tm_year = atoi(str + 0);
/* yymmdd or hhmmss? */
}
else if (len == 6)
{
#ifdef DATEDEBUG
printf("DecodeNumberField- %s is 6 characters fmask=%08x tmask=%08x\n", str, fmask, *tmask);
#endif
if (fmask & DTK_DATE_M)
{
#ifdef DATEDEBUG
printf("DecodeNumberField- %s is time field fmask=%08x tmask=%08x\n", str, fmask, *tmask);
#endif
*tmask = DTK_TIME_M;
tm->tm_sec = atoi(str + 4);
*(str + 4) = '\0';
tm->tm_min = atoi(str + 2);
*(str + 2) = '\0';
tm->tm_hour = atoi(str + 0);
}
else
{
#ifdef DATEDEBUG
printf("DecodeNumberField- %s is date field fmask=%08x tmask=%08x\n", str, fmask, *tmask);
#endif
*tmask = DTK_DATE_M;
tm->tm_mday = atoi(str + 4);
*(str + 4) = '\0';
tm->tm_mon = atoi(str + 2);
*(str + 2) = '\0';
tm->tm_year = atoi(str + 0);
#if 0
if (tm->tm_year < 70)
tm->tm_year += 2000;
else if (tm->tm_year < 100)
tm->tm_year += 1900;
#endif
*is2digits = TRUE;
}
}
else if ((len == 5) && !(fmask & DTK_DATE_M))
{
#ifdef DATEDEBUG
printf("DecodeNumberField- %s is 5 characters fmask=%08x tmask=%08x\n", str, fmask, *tmask);
#endif
*tmask = DTK_DATE_M;
tm->tm_mday = atoi(str + 2);
*(str + 2) = '\0';
tm->tm_mon = 1;
tm->tm_year = atoi(str + 0);
#if 0
if (tm->tm_year < 70)
tm->tm_year += 2000;
else if (tm->tm_year < 100)
tm->tm_year += 1900;
#endif
*is2digits = TRUE;
}
else if (strchr(str, '.') != NULL)
{
#ifdef DATEDEBUG
printf("DecodeNumberField- %s is time field fmask=%08x tmask=%08x\n", str, fmask, *tmask);
#endif
*tmask = DTK_TIME_M;
tm->tm_sec = strtod((str + 4), &cp);
if (cp == (str + 4))
return -1;
if (*cp == '.')
*fsec = strtod(cp, NULL);
*(str + 4) = '\0';
tm->tm_min = strtod((str + 2), &cp);
*(str + 2) = '\0';
tm->tm_hour = strtod((str + 0), &cp);
}
else
return -1;
return 0;
} /* DecodeNumberField() */
/* DecodeTimezone()
* Interpret string as a numeric timezone.
*/
static int
DecodeTimezone(char *str, int *tzp)
{
int tz;
int hr,
min;
char *cp;
int len;
/* assume leading character is "+" or "-" */
hr = strtol((str + 1), &cp, 10);
/* explicit delimiter? */
if (*cp == ':')
{
min = strtol((cp + 1), &cp, 10);
/* otherwise, might have run things together... */
}
else if ((*cp == '\0') && ((len = strlen(str)) > 3))
{
min = strtol((str + len - 2), &cp, 10);
*(str + len - 2) = '\0';
hr = strtol((str + 1), &cp, 10);
}
else
min = 0;
tz = (hr * 60 + min) * 60;
if (*str == '-')
tz = -tz;
*tzp = -tz;
return *cp != '\0';
} /* DecodeTimezone() */
/* DecodeSpecial()
* Decode text string using lookup table.
* Implement a cache lookup since it is likely that dates
* will be related in format.
*/
static int
DecodeSpecial(int field, char *lowtoken, int *val)
{
int type;
datetkn *tp;
#if USE_DATE_CACHE
if ((datecache[field] != NULL)
&& (strncmp(lowtoken, datecache[field]->token, TOKMAXLEN) == 0))
tp = datecache[field];
else
{
#endif
tp = datebsearch(lowtoken, datetktbl, szdatetktbl);
#if USE_DATE_CACHE
}
datecache[field] = tp;
#endif
if (tp == NULL)
{
type = IGNORE;
*val = 0;
}
else
{
type = tp->type;
switch (type)
{
case TZ:
case DTZ:
case DTZMOD:
*val = FROMVAL(tp);
break;
default:
*val = tp->value;
break;
}
}
return type;
} /* DecodeSpecial() */
/* DecodeDateDelta()
* Interpret previously parsed fields for general time interval.
* Return 0 if decoded and -1 if problems.
*
* Allow "date" field DTK_DATE since this could be just
* an unsigned floating point number. - thomas 1997-11-16
*
* Allow ISO-style time span, with implicit units on number of days
* preceeding an hh:mm:ss field. - thomas 1998-04-30
*/
int
DecodeDateDelta(char **field, int *ftype, int nf, int *dtype, struct tm * tm, double *fsec)
{
int is_before = FALSE;
char *cp;
int fmask = 0,
tmask,
type;
int i;
int flen,
val;
double fval;
double sec;
*dtype = DTK_DELTA;
type = DTK_SECOND;
tm->tm_year = 0;
tm->tm_mon = 0;
tm->tm_mday = 0;
tm->tm_hour = 0;
tm->tm_min = 0;
tm->tm_sec = 0;
*fsec = 0;
/* read through list backwards to pick up units before values */
for (i = nf - 1; i >= 0; i--)
{
#ifdef DATEDEBUG
printf("DecodeDateDelta- field[%d] is %s (type %d)\n", i, field[i], ftype[i]);
#endif
switch (ftype[i])
{
case DTK_TIME:
if (DecodeTime(field[i], fmask, &tmask, tm, fsec) != 0)
return -1;
type = DTK_DAY;
break;
case DTK_TZ:
/*
* Timezone is a token with a leading sign character and
* otherwise the same as a non-signed numeric field
*/
case DTK_DATE:
case DTK_NUMBER:
val = strtol(field[i], &cp, 10);
if (*cp == '.')
{
fval = strtod(cp, &cp);
if (*cp != '\0')
return -1;
if (val < 0)
fval = -(fval);
}
else if (*cp == '\0')
fval = 0;
else
return -1;
flen = strlen(field[i]);
tmask = 0; /* DTK_M(type); */
switch (type)
{
case DTK_MICROSEC:
*fsec += ((val + fval) * 1e-6);
break;
case DTK_MILLISEC:
*fsec += ((val + fval) * 1e-3);
break;
case DTK_SECOND:
tm->tm_sec += val;
*fsec += fval;
tmask = DTK_M(SECOND);
break;
case DTK_MINUTE:
tm->tm_min += val;
if (fval != 0)
tm->tm_sec += (fval * 60);
tmask = DTK_M(MINUTE);
break;
case DTK_HOUR:
tm->tm_hour += val;
if (fval != 0)
tm->tm_sec += (fval * 3600);
tmask = DTK_M(HOUR);
break;
case DTK_DAY:
tm->tm_mday += val;
if (fval != 0)
tm->tm_sec += (fval * 86400);
tmask = ((fmask & DTK_M(DAY)) ? 0 : DTK_M(DAY));
break;
case DTK_WEEK:
tm->tm_mday += val * 7;
if (fval != 0)
tm->tm_sec += (fval * (7 * 86400));
tmask = ((fmask & DTK_M(DAY)) ? 0 : DTK_M(DAY));
break;
case DTK_MONTH:
tm->tm_mon += val;
if (fval != 0)
tm->tm_sec += (fval * (30 * 86400));
tmask = DTK_M(MONTH);
break;
case DTK_YEAR:
tm->tm_year += val;
if (fval != 0)
tm->tm_mon += (fval * 12);
tmask = ((fmask & DTK_M(YEAR)) ? 0 : DTK_M(YEAR));
break;
case DTK_DECADE:
tm->tm_year += val * 10;
if (fval != 0)
tm->tm_mon += (fval * 120);
tmask = ((fmask & DTK_M(YEAR)) ? 0 : DTK_M(YEAR));
break;
case DTK_CENTURY:
tm->tm_year += val * 100;
if (fval != 0)
tm->tm_mon += (fval * 1200);
tmask = ((fmask & DTK_M(YEAR)) ? 0 : DTK_M(YEAR));
break;
case DTK_MILLENIUM:
tm->tm_year += val * 1000;
if (fval != 0)
tm->tm_mon += (fval * 12000);
tmask = ((fmask & DTK_M(YEAR)) ? 0 : DTK_M(YEAR));
break;
default:
return -1;
}
break;
case DTK_STRING:
case DTK_SPECIAL:
type = DecodeUnits(i, field[i], &val);
#ifdef DATEDEBUG
printf("DecodeDateDelta- special field[%d] %s type=%d value=%d\n", i, field[i], type, val);
#endif
if (type == IGNORE)
continue;
tmask = 0; /* DTK_M(type); */
switch (type)
{
case UNITS:
#ifdef DATEDEBUG
printf("DecodeDateDelta- UNITS field %s value is %d\n", field[i], val);
#endif
type = val;
break;
case AGO:
is_before = TRUE;
type = val;
break;
case RESERV:
tmask = (DTK_DATE_M || DTK_TIME_M);
*dtype = val;
break;
default:
return -1;
}
break;
default:
return -1;
}
#ifdef DATEDEBUG
printf("DecodeDateDelta- (%08x/%08x) field[%d] %s value is %d\n",
fmask, tmask, i, field[i], val);
#endif
if (tmask & fmask)
return -1;
fmask |= tmask;
}
if (*fsec != 0)
{
TMODULO(*fsec, sec, 1e0);
tm->tm_sec += sec;
}
if (is_before)
{
*fsec = -(*fsec);
tm->tm_sec = -(tm->tm_sec);
tm->tm_min = -(tm->tm_min);
tm->tm_hour = -(tm->tm_hour);
tm->tm_mday = -(tm->tm_mday);
tm->tm_mon = -(tm->tm_mon);
tm->tm_year = -(tm->tm_year);
}
#ifdef DATEDEBUG
printf("DecodeDateDelta- mask %08x (%08x)", fmask, DTK_DATE_M);
printf(" set y%04d m%02d d%02d", tm->tm_year, tm->tm_mon, tm->tm_mday);
printf(" %02d:%02d:%02d\n", tm->tm_hour, tm->tm_min, tm->tm_sec);
#endif
/* ensure that at least one time field has been found */
return (fmask != 0) ? 0 : -1;
} /* DecodeDateDelta() */
/* DecodeUnits()
* Decode text string using lookup table.
* This routine supports time interval decoding.
*/
static int
DecodeUnits(int field, char *lowtoken, int *val)
{
int type;
datetkn *tp;
#if USE_DATE_CACHE
if ((deltacache[field] != NULL)
&& (strncmp(lowtoken, deltacache[field]->token, TOKMAXLEN) == 0))
tp = deltacache[field];
else
{
#endif
tp = datebsearch(lowtoken, deltatktbl, szdeltatktbl);
#if USE_DATE_CACHE
}
deltacache[field] = tp;
#endif
if (tp == NULL)
{
type = IGNORE;
*val = 0;
}
else
{
type = tp->type;
if ((type == TZ) || (type == DTZ))
*val = FROMVAL(tp);
else
*val = tp->value;
}
return type;
} /* DecodeUnits() */
/* datebsearch()
* Binary search -- from Knuth (6.2.1) Algorithm B. Special case like this
* is WAY faster than the generic bsearch().
*/
static datetkn *
datebsearch(char *key, datetkn *base, unsigned int nel)
{
datetkn *last = base + nel - 1,
*position;
int result;
while (last >= base)
{
position = base + ((last - base) >> 1);
result = key[0] - position->token[0];
if (result == 0)
{
result = strncmp(key, position->token, TOKMAXLEN);
if (result == 0)
return position;
}
if (result < 0)
last = position - 1;
else
base = position + 1;
}
return NULL;
}
/* EncodeSpecialDateTime()
* Convert reserved datetime data type to string.
*/
static int
EncodeSpecialDateTime(DateTime dt, char *str)
{
if (DATETIME_IS_RESERVED(dt))
{
if (DATETIME_IS_INVALID(dt))
{
strcpy(str, INVALID);
}
else if (DATETIME_IS_NOBEGIN(dt))
{
strcpy(str, EARLY);
}
else if (DATETIME_IS_NOEND(dt))
{
strcpy(str, LATE);
}
else if (DATETIME_IS_CURRENT(dt))
{
strcpy(str, DCURRENT);
}
else if (DATETIME_IS_EPOCH(dt))
{
strcpy(str, EPOCH);
}
else
{
#ifdef DATEDEBUG
printf("EncodeSpecialDateTime- unrecognized date\n");
#endif
strcpy(str, INVALID);
}
return TRUE;
}
return FALSE;
} /* EncodeSpecialDateTime() */
/* EncodeDateOnly()
* Encode date as local time.
*/
int
EncodeDateOnly(struct tm * tm, int style, char *str)
{
if ((tm->tm_mon < 1) || (tm->tm_mon > 12))
return -1;
switch (style)
{
/* compatible with ISO date formats */
case USE_ISO_DATES:
if (tm->tm_year > 0)
sprintf(str, "%04d-%02d-%02d",
tm->tm_year, tm->tm_mon, tm->tm_mday);
else
sprintf(str, "%04d-%02d-%02d %s",
-(tm->tm_year - 1), tm->tm_mon, tm->tm_mday, "BC");
break;
/* compatible with Oracle/Ingres date formats */
case USE_SQL_DATES:
if (EuroDates)
sprintf(str, "%02d/%02d", tm->tm_mday, tm->tm_mon);
else
sprintf(str, "%02d/%02d", tm->tm_mon, tm->tm_mday);
if (tm->tm_year > 0)
sprintf((str + 5), "/%04d", tm->tm_year);
else
sprintf((str + 5), "/%04d %s", -(tm->tm_year - 1), "BC");
break;
/* German-style date format */
case USE_GERMAN_DATES:
sprintf(str, "%02d.%02d", tm->tm_mday, tm->tm_mon);
if (tm->tm_year > 0)
sprintf((str + 5), ".%04d", tm->tm_year);
else
sprintf((str + 5), ".%04d %s", -(tm->tm_year - 1), "BC");
break;
/* traditional date-only style for Postgres */
case USE_POSTGRES_DATES:
default:
if (EuroDates)
sprintf(str, "%02d-%02d", tm->tm_mday, tm->tm_mon);
else
sprintf(str, "%02d-%02d", tm->tm_mon, tm->tm_mday);
if (tm->tm_year > 0)
sprintf((str + 5), "-%04d", tm->tm_year);
else
sprintf((str + 5), "-%04d %s", -(tm->tm_year - 1), "BC");
break;
}
#ifdef DATEDEBUG
printf("EncodeDateOnly- date result is %s\n", str);
#endif
return TRUE;
} /* EncodeDateOnly() */
/* EncodeTimeOnly()
* Encode time fields only.
*/
int
EncodeTimeOnly(struct tm * tm, double fsec, int style, char *str)
{
double sec;
if ((tm->tm_hour < 0) || (tm->tm_hour > 24))
return -1;
sec = (tm->tm_sec + fsec);
sprintf(str, "%02d:%02d:", tm->tm_hour, tm->tm_min);
sprintf((str + 6), ((fsec != 0) ? "%05.2f" : "%02.0f"), sec);
#ifdef DATEDEBUG
printf("EncodeTimeOnly- time result is %s\n", str);
#endif
return TRUE;
} /* EncodeTimeOnly() */
/* EncodeDateTime()
* Encode date and time interpreted as local time.
* Support several date styles:
* Postgres - day mon hh:mm:ss yyyy tz
* SQL - mm/dd/yyyy hh:mm:ss.ss tz
* ISO - yyyy-mm-dd hh:mm:ss+/-tz
* German - dd.mm/yyyy hh:mm:ss tz
* Variants (affects order of month and day for Postgres and SQL styles):
* US - mm/dd/yyyy
* European - dd/mm/yyyy
*/
int
EncodeDateTime(struct tm * tm, double fsec, int *tzp, char **tzn, int style, char *str)
{
int day,
hour,
min;
double sec;
if ((tm->tm_mon < 1) || (tm->tm_mon > 12))
return -1;
sec = (tm->tm_sec + fsec);
#ifdef DATEDEBUG
#ifdef USE_POSIX_TIME
#if defined(HAVE_TM_ZONE)
printf("EncodeDateTime- timezone is %s (%s); offset is %ld (%d); daylight is %d (%d)\n",
*tzn, tm->tm_zone, (-tm->tm_gmtoff), CTimeZone, tm->tm_isdst, CDayLight);
#elif defined(HAVE_INT_TIMEZONE)
printf("EncodeDateTime- timezone is %s (%s); offset is %d (%d); daylight is %d (%d)\n",
*tzn, tzname[0], *tzp, CTimeZone, tm->tm_isdst, CDayLight);
#else
#error USE_POSIX_TIME is defined but neither HAVE_TM_ZONE or HAVE_INT_TIMEZONE are defined
#endif
#else
printf("EncodeDateTime- timezone is %s (%s); offset is %d; daylight is %d\n",
*tzn, CTZName, CTimeZone, CDayLight);
#endif
#endif
switch (style)
{
/* compatible with ISO date formats */
case USE_ISO_DATES:
if (tm->tm_year > 0)
{
sprintf(str, "%04d-%02d-%02d %02d:%02d:",
tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min);
sprintf((str + 17), ((fsec != 0) ? "%05.2f" : "%02.0f"), sec);
if ((*tzn != NULL) && (tm->tm_isdst >= 0))
{
if (tzp != NULL)
{
hour = -(*tzp / 3600);
min = ((abs(*tzp) / 60) % 60);
}
else
{
hour = 0;
min = 0;
}
sprintf((str + strlen(str)), ((min != 0) ? "%+03d:%02d" : "%+03d"), hour, min);
}
}
else
{
if (tm->tm_hour || tm->tm_min)
sprintf(str, "%04d-%02d-%02d %02d:%02d %s",
-(tm->tm_year - 1), tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min, "BC");
else
sprintf(str, "%04d-%02d-%02d %s",
-(tm->tm_year - 1), tm->tm_mon, tm->tm_mday, "BC");
}
break;
/* compatible with Oracle/Ingres date formats */
case USE_SQL_DATES:
if (EuroDates)
sprintf(str, "%02d/%02d", tm->tm_mday, tm->tm_mon);
else
sprintf(str, "%02d/%02d", tm->tm_mon, tm->tm_mday);
if (tm->tm_year > 0)
{
sprintf((str + 5), "/%04d %02d:%02d:%05.2f",
tm->tm_year, tm->tm_hour, tm->tm_min, sec);
if ((*tzn != NULL) && (tm->tm_isdst >= 0))
{
strcpy((str + 22), " ");
strcpy((str + 23), *tzn);
}
}
else
sprintf((str + 5), "/%04d %02d:%02d %s",
-(tm->tm_year - 1), tm->tm_hour, tm->tm_min, "BC");
break;
/* German variant on European style */
case USE_GERMAN_DATES:
sprintf(str, "%02d.%02d", tm->tm_mday, tm->tm_mon);
if (tm->tm_year > 0)
{
sprintf((str + 5), ".%04d %02d:%02d:%05.2f",
tm->tm_year, tm->tm_hour, tm->tm_min, sec);
if ((*tzn != NULL) && (tm->tm_isdst >= 0))
{
strcpy((str + 22), " ");
strcpy((str + 23), *tzn);
}
}
else
sprintf((str + 5), ".%04d %02d:%02d %s",
-(tm->tm_year - 1), tm->tm_hour, tm->tm_min, "BC");
break;
/* backward-compatible with traditional Postgres abstime dates */
case USE_POSTGRES_DATES:
default:
day = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday);
#ifdef DATEDEBUG
printf("EncodeDateTime- day is %d\n", day);
#endif
tm->tm_wday = j2day(day);
strncpy(str, days[tm->tm_wday], 3);
strcpy((str + 3), " ");
if (EuroDates)
sprintf((str + 4), "%02d %3s", tm->tm_mday, months[tm->tm_mon - 1]);
else
sprintf((str + 4), "%3s %02d", months[tm->tm_mon - 1], tm->tm_mday);
if (tm->tm_year > 0)
{
sprintf((str + 10), " %02d:%02d", tm->tm_hour, tm->tm_min);
if (fsec != 0)
{
sprintf((str + 16), ":%05.2f %04d", sec, tm->tm_year);
if ((*tzn != NULL) && (tm->tm_isdst >= 0))
{
strcpy((str + 27), " ");
strcpy((str + 28), *tzn);
}
}
else
{
sprintf((str + 16), ":%02.0f %04d", sec, tm->tm_year);
if ((*tzn != NULL) && (tm->tm_isdst >= 0))
{
strcpy((str + 24), " ");
strcpy((str + 25), *tzn);
}
}
}
else
{
sprintf((str + 10), " %02d:%02d %04d %s",
tm->tm_hour, tm->tm_min, -(tm->tm_year - 1), "BC");
}
break;
}
#ifdef DATEDEBUG
printf("EncodeDateTime- date result is %s\n", str);
#endif
return TRUE;
} /* EncodeDateTime() */
/* EncodeTimeSpan()
* Interpret time structure as a delta time and convert to string.
*
* Support "traditional Postgres" and ISO-8601 styles.
* Actually, afaik ISO does not address time interval formatting,
* but this looks similar to the spec for absolute date/time.
* - thomas 1998-04-30
*/
int
EncodeTimeSpan(struct tm * tm, double fsec, int style, char *str)
{
int is_before = FALSE;
int is_nonzero = FALSE;
char *cp = str;
switch (style)
{
/* compatible with ISO date formats */
case USE_ISO_DATES:
break;
default:
strcpy(cp, "@ ");
cp += strlen(cp);
break;
}
if (tm->tm_year != 0)
{
is_before |= (tm->tm_year < 0);
sprintf(cp, "%d year%s",
abs(tm->tm_year), ((abs(tm->tm_year) != 1) ? "s" : ""));
cp += strlen(cp);
is_nonzero = TRUE;
}
if (tm->tm_mon != 0)
{
is_before |= (tm->tm_mon < 0);
sprintf(cp, "%s%d mon%s", (is_nonzero ? " " : ""),
abs(tm->tm_mon), ((abs(tm->tm_mon) != 1) ? "s" : ""));
cp += strlen(cp);
is_nonzero = TRUE;
}
switch (style)
{
/* compatible with ISO date formats */
case USE_ISO_DATES:
if (tm->tm_mday != 0)
{
is_before |= (tm->tm_mday < 0);
sprintf(cp, "%s%d", (is_nonzero ? " " : ""), abs(tm->tm_mday));
cp += strlen(cp);
is_nonzero = TRUE;
}
is_before |= ((tm->tm_hour < 0) || (tm->tm_min < 0));
sprintf(cp, "%s%02d:%02d", (is_nonzero ? " " : ""),
abs(tm->tm_hour), abs(tm->tm_min));
cp += strlen(cp);
if ((tm->tm_hour != 0) || (tm->tm_min != 0))
is_nonzero = TRUE;
/* fractional seconds? */
if (fsec != 0)
{
fsec += tm->tm_sec;
is_before |= (fsec < 0);
sprintf(cp, ":%05.2f", fabs(fsec));
cp += strlen(cp);
is_nonzero = TRUE;
/* otherwise, integer seconds only? */
}
else if (tm->tm_sec != 0)
{
is_before |= (tm->tm_sec < 0);
sprintf(cp, ":%02d", abs(tm->tm_sec));
cp += strlen(cp);
is_nonzero = TRUE;
}
break;
case USE_POSTGRES_DATES:
default:
if (tm->tm_mday != 0)
{
is_before |= (tm->tm_mday < 0);
sprintf(cp, "%s%d day%s", (is_nonzero ? " " : ""),
abs(tm->tm_mday), ((abs(tm->tm_mday) != 1) ? "s" : ""));
cp += strlen(cp);
is_nonzero = TRUE;
}
if (tm->tm_hour != 0)
{
is_before |= (tm->tm_hour < 0);
sprintf(cp, "%s%d hour%s", (is_nonzero ? " " : ""),
abs(tm->tm_hour), ((abs(tm->tm_hour) != 1) ? "s" : ""));
cp += strlen(cp);
is_nonzero = TRUE;
}
if (tm->tm_min != 0)
{
is_before |= (tm->tm_min < 0);
sprintf(cp, "%s%d min%s", (is_nonzero ? " " : ""),
abs(tm->tm_min), ((abs(tm->tm_min) != 1) ? "s" : ""));
cp += strlen(cp);
is_nonzero = TRUE;
}
/* fractional seconds? */
if (fsec != 0)
{
fsec += tm->tm_sec;
is_before |= (fsec < 0);
sprintf(cp, "%s%.2f secs", (is_nonzero ? " " : ""), fabs(fsec));
cp += strlen(cp);
is_nonzero = TRUE;
/* otherwise, integer seconds only? */
}
else if (tm->tm_sec != 0)
{
is_before |= (tm->tm_sec < 0);
sprintf(cp, "%s%d sec%s", (is_nonzero ? " " : ""),
abs(tm->tm_sec), ((abs(tm->tm_sec) != 1) ? "s" : ""));
cp += strlen(cp);
is_nonzero = TRUE;
}
break;
}
/* identically zero? then put in a unitless zero... */
if (!is_nonzero)
{
strcat(cp, "0");
cp += strlen(cp);
}
if (is_before)
{
strcat(cp, " ago");
cp += strlen(cp);
}
#ifdef DATEDEBUG
printf("EncodeTimeSpan- result is %s\n", str);
#endif
return 0;
} /* EncodeTimeSpan() */
#if defined(linux) && defined(PPC)
int
datetime_is_epoch(double j)
{
static union
{
double epoch;
unsigned char c[8];
} u;
u.c[0] = 0x80; /* sign bit */
u.c[1] = 0x10; /* DBL_MIN */
return j == u.epoch;
}
int
datetime_is_current(double j)
{
static union
{
double current;
unsigned char c[8];
} u;
u.c[1] = 0x10; /* DBL_MIN */
return j == u.current;
}
#endif
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