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https://github.com/postgres/postgres.git
synced 2025-04-24 10:47:04 +03:00
Fix "Y-2K" problem with two-digit BC dates being corrected by two millenia.
They are not corrected now. Allow the date type to accept BC dates. Share more date/time validation declarations through dt.h.
This commit is contained in:
Thomas G. Lockhart
parent
791822e3a7
commit
1ace93c46c
@ -7,7 +7,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/datetime.c,v 1.26 1998/12/31 16:30:56 thomas Exp $
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/datetime.c,v 1.27 1999/01/20 16:29:39 thomas Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -27,12 +27,13 @@
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static int date2tm(DateADT dateVal, int *tzp, struct tm * tm, double *fsec, char **tzn);
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#if 0
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static int day_tab[2][12] = {
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{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
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{31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}};
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#define isleap(y) (((y % 4) == 0 && (y % 100) != 0) || (y % 400) == 0)
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#endif
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#define UTIME_MINYEAR (1901)
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#define UTIME_MINMONTH (12)
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@ -99,10 +100,12 @@ date_in(char *str)
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elog(ERROR, "Unrecognized date external representation %s", str);
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}
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#if 0
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if (tm->tm_year < 0 || tm->tm_year > 32767)
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elog(ERROR, "date_in: year must be limited to values 0 through 32767 in '%s'", str);
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if (tm->tm_mon < 1 || tm->tm_mon > 12)
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elog(ERROR, "date_in: month must be limited to values 1 through 12 in '%s'", str);
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#endif
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if (tm->tm_mday < 1 || tm->tm_mday > day_tab[isleap(tm->tm_year)][tm->tm_mon - 1])
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elog(ERROR, "date_in: day must be limited to values 1 through %d in '%s'",
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day_tab[isleap(tm->tm_year)][tm->tm_mon - 1], str);
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@ -7,7 +7,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/Attic/dt.c,v 1.61 1999/01/10 17:20:54 thomas Exp $
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/Attic/dt.c,v 1.62 1999/01/20 16:29:39 thomas Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -31,11 +31,12 @@
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#endif
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#include "utils/builtins.h"
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static int DecodeDate(char *str, int fmask, int *tmask, struct tm * tm);
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static int DecodeNumber(int flen, char *field,
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int fmask, int *tmask, struct tm * tm, double *fsec);
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int fmask, int *tmask, struct tm * tm, double *fsec, int *is2digits);
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static int DecodeNumberField(int len, char *str,
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int fmask, int *tmask, struct tm * tm, double *fsec);
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int fmask, int *tmask, struct tm * tm, double *fsec, int *is2digits);
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static int DecodeSpecial(int field, char *lowtoken, int *val);
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static int DecodeTime(char *str, int fmask, int *tmask,
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struct tm * tm, double *fsec);
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@ -50,12 +51,20 @@ static double time2t(const int hour, const int min, const double sec);
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static int timespan2tm(TimeSpan span, struct tm * tm, float8 *fsec);
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static int tm2timespan(struct tm * tm, double fsec, TimeSpan *span);
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#define USE_DATE_CACHE 1
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#define ROUND_ALL 0
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#if 0
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#define isleap(y) (((y % 4) == 0) && (((y % 100) != 0) || ((y % 400) == 0)))
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int mdays[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31, 0};
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#endif
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int day_tab[2][13] = {
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{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31, 0},
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{31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31, 0}};
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char *months[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec", NULL};
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@ -873,6 +882,7 @@ datetime_pl_span(DateTime *datetime, TimeSpan *span)
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}
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/* adjust for end of month boundary problems... */
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#if 0
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if (tm->tm_mday > mdays[tm->tm_mon - 1])
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{
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if ((tm->tm_mon == 2) && isleap(tm->tm_year))
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@ -880,6 +890,9 @@ datetime_pl_span(DateTime *datetime, TimeSpan *span)
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else
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tm->tm_mday = mdays[tm->tm_mon - 1];
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}
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#endif
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if (tm->tm_mday > day_tab[isleap(tm->tm_year)][tm->tm_mon - 1])
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tm->tm_mday = (day_tab[isleap(tm->tm_year)][tm->tm_mon - 1]);
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#ifdef DATEDEBUG
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printf("datetime_pl_span- date becomes %04d-%02d-%02d %02d:%02d:%02d\n",
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@ -1184,16 +1197,22 @@ datetime_age(DateTime *datetime1, DateTime *datetime2)
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{
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if (dt1 < dt2)
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{
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#if 0
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tm->tm_mday += mdays[tm1->tm_mon - 1];
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if (isleap(tm1->tm_year) && (tm1->tm_mon == 2))
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tm->tm_mday++;
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#endif
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tm->tm_mday += day_tab[isleap(tm1->tm_year)][tm1->tm_mon - 1];
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tm->tm_mon--;
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}
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else
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{
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#if 0
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tm->tm_mday += mdays[tm2->tm_mon - 1];
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if (isleap(tm2->tm_year) && (tm2->tm_mon == 2))
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tm->tm_mday++;
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#endif
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tm->tm_mday += day_tab[isleap(tm2->tm_year)][tm2->tm_mon - 1];
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tm->tm_mon--;
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}
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}
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@ -2036,7 +2055,7 @@ static datetkn datetktbl[] = {
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{"adt", DTZ, NEG(18)}, /* Atlantic Daylight Time */
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{"aesst", DTZ, 66}, /* E. Australia */
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{"aest", TZ, 60}, /* Australia Eastern Std Time */
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{"ahst", TZ, 60}, /* Alaska-Hawaii Std Time */
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{"ahst", TZ, NEG(60)}, /* Alaska-Hawaii Std Time */
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{"allballs", RESERV, DTK_ZULU}, /* 00:00:00 */
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{"am", AMPM, AM},
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{"apr", MONTH, 4},
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@ -2087,12 +2106,12 @@ static datetkn datetktbl[] = {
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{"hmt", DTZ, 18}, /* Hellas ? ? */
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{"hst", TZ, NEG(60)}, /* Hawaii Std Time */
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{"idle", TZ, 72}, /* Intl. Date Line, East */
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{"idlw", TZ, NEG(72)}, /* Intl. Date Line,, est */
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{"idlw", TZ, NEG(72)}, /* Intl. Date Line, West */
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{LATE, RESERV, DTK_LATE}, /* "infinity" reserved for "late time" */
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{INVALID, RESERV, DTK_INVALID}, /* "invalid" reserved for invalid
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* time */
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{INVALID, RESERV, DTK_INVALID},
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/* "invalid" reserved for invalid time */
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{"ist", TZ, 12}, /* Israel */
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{"it", TZ, 22}, /* Iran Time */
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{"it", TZ, 21}, /* Iran Time */
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{"jan", MONTH, 1},
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{"january", MONTH, 1},
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{"jst", TZ, 54}, /* Japan Std Time,USSR Zone 8 */
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@ -2283,6 +2302,8 @@ datetkn *deltacache[MAXDATEFIELDS] = {NULL};
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* These routines will be used by other date/time packages - tgl 97/02/25
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*/
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#if 0
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XXX moved to dt.h - thomas 1999-01-15
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/* Set the minimum year to one greater than the year of the first valid day
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* to avoid having to check year and day both. - tgl 97/05/08
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*/
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@ -2294,6 +2315,7 @@ datetkn *deltacache[MAXDATEFIELDS] = {NULL};
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#define IS_VALID_JULIAN(y,m,d) ((y > JULIAN_MINYEAR) \
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|| ((y == JULIAN_MINYEAR) && ((m > JULIAN_MINMONTH) \
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|| ((m == JULIAN_MINMONTH) && (d >= JULIAN_MINDAY)))))
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#endif
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int
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date2j(int y, int m, int d)
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@ -2792,6 +2814,7 @@ DecodeDateTime(char **field, int *ftype, int nf,
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int flen,
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val;
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int mer = HR24;
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int is2digits = FALSE;
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int bc = FALSE;
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*dtype = DTK_DATE;
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@ -2843,14 +2866,14 @@ DecodeDateTime(char **field, int *ftype, int nf,
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* then interpret as a concatenated date or time... */
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if ((flen > 4) && !((fmask & DTK_DATE_M) && (fmask & DTK_TIME_M)))
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{
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if (DecodeNumberField(flen, field[i], fmask, &tmask, tm, fsec) != 0)
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if (DecodeNumberField(flen, field[i], fmask, &tmask, tm, fsec, &is2digits) != 0)
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return -1;
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}
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/* otherwise it is a single date/time field... */
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else
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{
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if (DecodeNumber(flen, field[i], fmask, &tmask, tm, fsec) != 0)
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if (DecodeNumber(flen, field[i], fmask, &tmask, tm, fsec, &is2digits) != 0)
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return -1;
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}
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break;
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@ -3009,6 +3032,13 @@ DecodeDateTime(char **field, int *ftype, int nf,
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else
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elog(ERROR,"Inconsistant use of year %04d and 'BC'", tm->tm_year);
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}
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else if (is2digits)
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{
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if (tm->tm_year < 70)
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tm->tm_year += 2000;
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else if (tm->tm_year < 100)
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tm->tm_year += 1900;
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}
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if ((mer != HR24) && (tm->tm_hour > 12))
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return -1;
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@ -3083,6 +3113,7 @@ DecodeTimeOnly(char **field, int *ftype, int nf, int *dtype, struct tm * tm, dou
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int i;
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int flen,
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val;
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int is2digits = FALSE;
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int mer = HR24;
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*dtype = DTK_TIME;
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@ -3110,7 +3141,7 @@ DecodeTimeOnly(char **field, int *ftype, int nf, int *dtype, struct tm * tm, dou
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case DTK_NUMBER:
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flen = strlen(field[i]);
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if (DecodeNumberField(flen, field[i], fmask, &tmask, tm, fsec) != 0)
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if (DecodeNumberField(flen, field[i], fmask, &tmask, tm, fsec, &is2digits) != 0)
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return -1;
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break;
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@ -3209,6 +3240,8 @@ DecodeDate(char *str, int fmask, int *tmask, struct tm * tm)
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int nf = 0;
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int i,
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len;
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int bc = FALSE;
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int is2digits = FALSE;
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int type,
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val,
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dmask = 0;
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@ -3238,9 +3271,11 @@ DecodeDate(char *str, int fmask, int *tmask, struct tm * tm)
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nf++;
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}
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#if 0
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/* don't allow too many fields */
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if (nf > 3)
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return -1;
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#endif
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*tmask = 0;
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@ -3263,6 +3298,10 @@ DecodeDate(char *str, int fmask, int *tmask, struct tm * tm)
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tm->tm_mon = val;
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break;
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case ADBC:
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bc = (val == BC);
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break;
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default:
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#ifdef DATEDEBUG
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printf("DecodeDate- illegal field %s value is %d\n", field[i], val);
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@ -3289,7 +3328,7 @@ DecodeDate(char *str, int fmask, int *tmask, struct tm * tm)
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if ((len = strlen(field[i])) <= 0)
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return -1;
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if (DecodeNumber(len, field[i], fmask, &dmask, tm, &fsec) != 0)
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if (DecodeNumber(len, field[i], fmask, &dmask, tm, &fsec, &is2digits) != 0)
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return -1;
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if (fmask & dmask)
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@ -3299,6 +3338,25 @@ DecodeDate(char *str, int fmask, int *tmask, struct tm * tm)
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*tmask |= dmask;
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}
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if ((fmask & ~(DTK_M(DOY) | DTK_M(TZ))) != DTK_DATE_M)
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return -1;
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/* there is no year zero in AD/BC notation; i.e. "1 BC" == year 0 */
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if (bc)
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{
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if (tm->tm_year > 0)
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tm->tm_year = -(tm->tm_year - 1);
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else
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elog(ERROR,"Inconsistant use of year %04d and 'BC'", tm->tm_year);
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}
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else if (is2digits)
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{
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if (tm->tm_year < 70)
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tm->tm_year += 2000;
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else if (tm->tm_year < 100)
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tm->tm_year += 1900;
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}
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return 0;
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} /* DecodeDate() */
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@ -3362,7 +3420,8 @@ DecodeTime(char *str, int fmask, int *tmask, struct tm * tm, double *fsec)
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* Interpret numeric field as a date value in context.
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*/
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static int
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DecodeNumber(int flen, char *str, int fmask, int *tmask, struct tm * tm, double *fsec)
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DecodeNumber(int flen, char *str, int fmask,
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int *tmask, struct tm * tm, double *fsec, int *is2digits)
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{
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int val;
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char *cp;
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@ -3475,6 +3534,7 @@ DecodeNumber(int flen, char *str, int fmask, int *tmask, struct tm * tm, double
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tm->tm_year = val;
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/* adjust ONLY if exactly two digits... */
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#if 0
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if (flen == 2)
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{
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if (tm->tm_year < 70)
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@ -3482,6 +3542,8 @@ DecodeNumber(int flen, char *str, int fmask, int *tmask, struct tm * tm, double
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else if (tm->tm_year < 100)
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tm->tm_year += 1900;
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}
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#endif
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*is2digits = (flen == 2);
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}
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else
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@ -3495,7 +3557,8 @@ DecodeNumber(int flen, char *str, int fmask, int *tmask, struct tm * tm, double
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* Interpret numeric string as a concatenated date field.
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*/
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static int
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DecodeNumberField(int len, char *str, int fmask, int *tmask, struct tm * tm, double *fsec)
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DecodeNumberField(int len, char *str, int fmask,
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int *tmask, struct tm * tm, double *fsec, int *is2digits)
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{
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char *cp;
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@ -3546,10 +3609,13 @@ DecodeNumberField(int len, char *str, int fmask, int *tmask, struct tm * tm, dou
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*(str + 2) = '\0';
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tm->tm_year = atoi(str + 0);
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#if 0
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if (tm->tm_year < 70)
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tm->tm_year += 2000;
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else if (tm->tm_year < 100)
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tm->tm_year += 1900;
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#endif
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*is2digits = TRUE;
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}
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}
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@ -3564,10 +3630,13 @@ DecodeNumberField(int len, char *str, int fmask, int *tmask, struct tm * tm, dou
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tm->tm_mon = 1;
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tm->tm_year = atoi(str + 0);
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#if 0
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if (tm->tm_year < 70)
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tm->tm_year += 2000;
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else if (tm->tm_year < 100)
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tm->tm_year += 1900;
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#endif
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*is2digits = TRUE;
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}
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else if (strchr(str, '.') != NULL)
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{
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