dt.c
上传用户:blenddy
上传日期:2007-01-07
资源大小:6495k
文件大小:99k
- /*-------------------------------------------------------------------------
- *
- * dt.c
- * Functions for the built-in type "dt".
- *
- * Copyright (c) 1994, Regents of the University of California
- *
- *
- * IDENTIFICATION
- * $Header: /usr/local/cvsroot/pgsql/src/backend/utils/adt/dt.c,v 1.72.2.1 1999/08/02 05:24:51 scrappy Exp $
- *
- *-------------------------------------------------------------------------
- */
- #include <ctype.h>
- #include <math.h>
- #include <sys/types.h>
- #include <errno.h>
- #include "postgres.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 "miscadmin.h"
- #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
- 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 %fn", *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:%02dn",
- 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 %fn", dt);
- #endif
- }
- else
- { /* if (DATETIME_IS_EPOCH(dt1)) */
- GetEpochTime(&tt);
- tm2datetime(&tt, 0, NULL, &dt);
- #ifdef DATEDEBUG
- printf("SetDateTime- epoch time is %fn", 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 %fn", 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 - %fn", 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 %fn", *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:%02dn",
- 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 (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:%02dn",
- 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 %fn",
- 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 %fn",
- 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 divide 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)
- {
- tm->tm_mday += day_tab[isleap(tm1->tm_year)][tm1->tm_mon - 1];
- tm->tm_mon--;
- }
- else
- {
- 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 = ' ';
- 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 = ' ';
- 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 = ' ';
- type = DecodeUnits(0, lowunits, &val);
- #ifdef DATEDEBUG
- if (type == IGNORE)
- strcpy(lowunits, "(unknown)");
- printf("datetime_trunc- units %s type=%d value=%dn", 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 * 1000000) / 1000000;
- 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)
- #ifdef __CYGWIN__
- tz = (tm->tm_isdst ? (_timezone - 3600) : _timezone);
- #else
- tz = (tm->tm_isdst ? (timezone - 3600) : timezone);
- #endif
- #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 = ' ';
- type = DecodeUnits(0, lowunits, &val);
- #ifdef DATEDEBUG
- if (type == IGNORE)
- strcpy(lowunits, "(unknown)");
- printf("timespan_trunc- units %s type=%d value=%dn", 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 * 1000000) / 1000000;
- 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 = ' ';
- 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=%dn", 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);
- break;
- case DTK_CENTURY:
- *result = (tm->tm_year / 100);
- break;
- case DTK_MILLENIUM:
- *result = (tm->tm_year / 1000);
- 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 = ' ';
- 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=%dn", 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 = ' ';
- type = DecodeSpecial(0, lowzone, &val);
- #ifdef DATEDEBUG
- if (type == IGNORE)
- strcpy(lowzone, "(unknown)");
- printf("datetime_zone- zone %s type=%d value=%dn", 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 != ' '; i++)
- *up++ = toupper(*lp++);
- *up = ' ';
- 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
- */
- 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.%02dn", tm->tm_year, tm->tm_mon, tm->tm_mday);
- printf("datetime2tm- time is %02d:%02d:%02.0fn", 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 %.7fn", 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=%dn",
- 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=%dn",
- 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)
- #ifdef __CYGWIN__
- *tzp = (tm->tm_isdst ? (_timezone - 3600) : _timezone);
- #else
- *tzp = (tm->tm_isdst ? (timezone - 3600) : timezone);
- #endif
- if (tzn != NULL)
- *tzn = tzname[(tm->tm_isdst > 0)];
- #else
- #error USE_POSIX_TIME is defined but neither HAVE_TM_ZONE or HAVE_INT_TIMEZONE are defined
- #endif
- #else /* !USE_POSIX_TIME */
- *tzp = CTimeZone; /* V7 conventions; don't know timezone? */
- if (tzn != NULL)
- *tzn = CTZName;
- #endif
- }
- 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.%02dn", tm->tm_year, tm->tm_mon, tm->tm_mday);
- printf("datetime2tm- time is %02d:%02d:%02d %.7fn", 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 %dn",
- tm->tm_zone, ((tzp != NULL) ? *tzp : 0));
- #elif defined(HAVE_INT_TIMEZONE)
- printf("datetime2tm- timezone is %s; offset is %d (%d); daylight is %dn",
- 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 %fn", 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 %.2fn", 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 %.2fn", 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 %sn", timestr);
- #endif
- /* outer loop through fields */
- while (*cp != ' ')
- {
- 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++ = ' ';
- nf++;
- if (nf > MAXDATEFIELDS)
- return -1;
- #ifdef DATEDEBUG
- printf("ParseDateTime- set field[%d] to %s type %dn", (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=%dn", 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 %dn", 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 %dn", 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 %dn", 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 %dn",
- 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:%02dn", tm->tm_hour, tm->tm_min, tm->tm_sec);
- #endif
- /* do additional checking for full date specs... */
- if (*dtype == DTK_DATE)
- {
- if ((fmask & DTK_DATE_M) != DTK_DATE_M)
- return ((fmask & DTK_TIME_M) == DTK_TIME_M) ? 1 : -1;
- /*
- * check for valid day of month, now that we know for sure the
- * month and year...
- */
- if ((tm->tm_mday < 1)
- || (tm->tm_mday > day_tab[isleap(tm->tm_year)][tm->tm_mon - 1]))
- return -1;
- /* timezone not specified? then find local timezone if possible */
- if (((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)
- #ifdef __CYGWIN__
- *tzp = ((tm->tm_isdst > 0) ? (_timezone - 3600) : _timezone);
- #else
- *tzp = ((tm->tm_isdst > 0) ? (timezone - 3600) : timezone);
- #endif
- #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=%dn", 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 %dn", 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 %dn", 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 (((tm->tm_hour < 0) || (tm->tm_hour > 23))
- || ((tm->tm_min < 0) || (tm->tm_min > 59))
- || ((tm->tm_sec < 0) || ((tm->tm_sec + *fsec) >= 60)))
- return -1;
- 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 != ' ') && (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 != ' ')
- *str++ = ' ';
- 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 %dn", 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 %dn", 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 == ' ')
- {
- tm->tm_sec = 0;
- *fsec = 0;
- }
- else if (*cp != ':')
- {
- return -1;
- }
- else
- {
- str = cp + 1;
- tm->tm_sec = strtol(str, &cp, 10);
- if (*cp == ' ')
- *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 != ' ')
- return -1;
- }
- #ifdef DATEDEBUG
- printf("DecodeNumber- %s is %d fmask=%08x tmask=%08xn", 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 yearn", 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 %dn", 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 monthn", 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 dayn", 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 monthn", 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 dayn", 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 yearn", val, str);
- #endif
- *tmask = DTK_M(YEAR);
- tm->tm_year = val;
- /* adjust ONLY if exactly two digits... */
- *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=%08xn", str, fmask, *tmask);
- #endif
- *tmask = DTK_DATE_M;
- tm->tm_mday = atoi(str + 6);
- *(str + 6) = ' ';
- tm->tm_mon = atoi(str + 4);
- *(str + 4) = ' ';
- tm->tm_year = atoi(str + 0);
- /* yymmdd or hhmmss? */
- }
- else if (len == 6)
- {
- #ifdef DATEDEBUG
- printf("DecodeNumberField- %s is 6 characters fmask=%08x tmask=%08xn", str, fmask, *tmask);
- #endif
- if (fmask & DTK_DATE_M)
- {
- #ifdef DATEDEBUG
- printf("DecodeNumberField- %s is time field fmask=%08x tmask=%08xn", str, fmask, *tmask);
- #endif
- *tmask = DTK_TIME_M;
- tm->tm_sec = atoi(str + 4);
- *(str + 4) = ' ';
- tm->tm_min = atoi(str + 2);
- *(str + 2) = ' ';
- tm->tm_hour = atoi(str + 0);
- }
- else
- {
- #ifdef DATEDEBUG
- printf("DecodeNumberField- %s is date field fmask=%08x tmask=%08xn", str, fmask, *tmask);
- #endif
- *tmask = DTK_DATE_M;
- tm->tm_mday = atoi(str + 4);
- *(str + 4) = ' ';
- tm->tm_mon = atoi(str + 2);
- *(str + 2) = ' ';
- tm->tm_year = atoi(str + 0);
- *is2digits = TRUE;
- }
- }
- else if ((len == 5) && !(fmask & DTK_DATE_M))
- {
- #ifdef DATEDEBUG
- printf("DecodeNumberField- %s is 5 characters fmask=%08x tmask=%08xn", str, fmask, *tmask);
- #endif
- *tmask = DTK_DATE_M;
- tm->tm_mday = atoi(str + 2);
- *(str + 2) = ' ';
- tm->tm_mon = 1;
- tm->tm_year = atoi(str + 0);
- *is2digits = TRUE;
- }
- else if (strchr(str, '.') != NULL)
- {
- #ifdef DATEDEBUG
- printf("DecodeNumberField- %s is time field fmask=%08x tmask=%08xn", 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) = ' ';
- tm->tm_min = strtod((str + 2), &cp);
- *(str + 2) = ' ';
- 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 == ' ') && ((len = strlen(str)) > 3))
- {
- min = strtol((str + len - 2), &cp, 10);
- *(str + len - 2) = ' ';
- hr = strtol((str + 1), &cp, 10);
- }
- else
- min = 0;
- tz = (hr * 60 + min) * 60;
- if (*str == '-')
- tz = -tz;
- *tzp = -tz;
- return *cp != ' ';
- } /* 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 != ' ')
- return -1;
- if (val < 0)
- fval = -(fval);
- }
- else if (*cp == ' ')
- 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=%dn", 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 %dn", 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 %dn",
- 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:%02dn", 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 daten");
- #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 %sn", 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 %sn", 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 %dn",
- *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 %dn", 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 %sn", 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 %sn", str);
- #endif
- return 0;
- } /* EncodeTimeSpan() */
- #if defined(linux) && defined(__powerpc__)
- 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