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Commit1ace93c

Browse files
author
Thomas G. Lockhart
committed
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.
1 parent791822e commit1ace93c

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2 files changed

+88
-16
lines changed

2 files changed

+88
-16
lines changed

‎src/backend/utils/adt/datetime.c‎

Lines changed: 5 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
*
88
*
99
* IDENTIFICATION
10-
* $Header: /cvsroot/pgsql/src/backend/utils/adt/datetime.c,v 1.26 1998/12/31 16:30:56 thomas Exp $
10+
* $Header: /cvsroot/pgsql/src/backend/utils/adt/datetime.c,v 1.27 1999/01/20 16:29:39 thomas Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -27,12 +27,13 @@
2727

2828
staticintdate2tm(DateADTdateVal,int*tzp,structtm*tm,double*fsec,char**tzn);
2929

30-
30+
#if0
3131
staticintday_tab[2][12]= {
3232
{31,28,31,30,31,30,31,31,30,31,30,31},
3333
{31,29,31,30,31,30,31,31,30,31,30,31}};
3434

3535
#defineisleap(y) (((y % 4) == 0 && (y % 100) != 0) || (y % 400) == 0)
36+
#endif
3637

3738
#defineUTIME_MINYEAR (1901)
3839
#defineUTIME_MINMONTH (12)
@@ -99,10 +100,12 @@ date_in(char *str)
99100
elog(ERROR,"Unrecognized date external representation %s",str);
100101
}
101102

103+
#if0
102104
if (tm->tm_year<0||tm->tm_year>32767)
103105
elog(ERROR,"date_in: year must be limited to values 0 through 32767 in '%s'",str);
104106
if (tm->tm_mon<1||tm->tm_mon>12)
105107
elog(ERROR,"date_in: month must be limited to values 1 through 12 in '%s'",str);
108+
#endif
106109
if (tm->tm_mday<1||tm->tm_mday>day_tab[isleap(tm->tm_year)][tm->tm_mon-1])
107110
elog(ERROR,"date_in: day must be limited to values 1 through %d in '%s'",
108111
day_tab[isleap(tm->tm_year)][tm->tm_mon-1],str);

‎src/backend/utils/adt/dt.c‎

Lines changed: 83 additions & 14 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
*
88
*
99
* IDENTIFICATION
10-
* $Header: /cvsroot/pgsql/src/backend/utils/adt/Attic/dt.c,v 1.61 1999/01/10 17:20:54 thomas Exp $
10+
* $Header: /cvsroot/pgsql/src/backend/utils/adt/Attic/dt.c,v 1.62 1999/01/20 16:29:39 thomas Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -31,11 +31,12 @@
3131
#endif
3232
#include"utils/builtins.h"
3333

34+
3435
staticintDecodeDate(char*str,intfmask,int*tmask,structtm*tm);
3536
staticintDecodeNumber(intflen,char*field,
36-
intfmask,int*tmask,structtm*tm,double*fsec);
37+
intfmask,int*tmask,structtm*tm,double*fsec,int*is2digits);
3738
staticintDecodeNumberField(intlen,char*str,
38-
intfmask,int*tmask,structtm*tm,double*fsec);
39+
intfmask,int*tmask,structtm*tm,double*fsec,int*is2digits);
3940
staticintDecodeSpecial(intfield,char*lowtoken,int*val);
4041
staticintDecodeTime(char*str,intfmask,int*tmask,
4142
structtm*tm,double*fsec);
@@ -50,12 +51,20 @@ static double time2t(const int hour, const int min, const double sec);
5051
staticinttimespan2tm(TimeSpanspan,structtm*tm,float8*fsec);
5152
staticinttm2timespan(structtm*tm,doublefsec,TimeSpan*span);
5253

54+
5355
#defineUSE_DATE_CACHE 1
5456
#defineROUND_ALL 0
5557

58+
#if0
5659
#defineisleap(y) (((y % 4) == 0) && (((y % 100) != 0) || ((y % 400) == 0)))
5760

5861
intmdays[]= {31,28,31,30,31,30,31,31,30,31,30,31,0};
62+
#endif
63+
64+
intday_tab[2][13]= {
65+
{31,28,31,30,31,30,31,31,30,31,30,31,0},
66+
{31,29,31,30,31,30,31,31,30,31,30,31,0}};
67+
5968

6069
char*months[]= {"Jan","Feb","Mar","Apr","May","Jun",
6170
"Jul","Aug","Sep","Oct","Nov","Dec",NULL};
@@ -873,13 +882,17 @@ datetime_pl_span(DateTime *datetime, TimeSpan *span)
873882
}
874883

875884
/* adjust for end of month boundary problems... */
885+
#if0
876886
if (tm->tm_mday>mdays[tm->tm_mon-1])
877887
{
878888
if ((tm->tm_mon==2)&&isleap(tm->tm_year))
879889
tm->tm_mday= (mdays[tm->tm_mon-1]+1);
880890
else
881891
tm->tm_mday=mdays[tm->tm_mon-1];
882892
}
893+
#endif
894+
if (tm->tm_mday>day_tab[isleap(tm->tm_year)][tm->tm_mon-1])
895+
tm->tm_mday= (day_tab[isleap(tm->tm_year)][tm->tm_mon-1]);
883896

884897
#ifdefDATEDEBUG
885898
printf("datetime_pl_span- date becomes %04d-%02d-%02d %02d:%02d:%02d\n",
@@ -1184,16 +1197,22 @@ datetime_age(DateTime *datetime1, DateTime *datetime2)
11841197
{
11851198
if (dt1<dt2)
11861199
{
1200+
#if0
11871201
tm->tm_mday+=mdays[tm1->tm_mon-1];
11881202
if (isleap(tm1->tm_year)&& (tm1->tm_mon==2))
11891203
tm->tm_mday++;
1204+
#endif
1205+
tm->tm_mday+=day_tab[isleap(tm1->tm_year)][tm1->tm_mon-1];
11901206
tm->tm_mon--;
11911207
}
11921208
else
11931209
{
1210+
#if0
11941211
tm->tm_mday+=mdays[tm2->tm_mon-1];
11951212
if (isleap(tm2->tm_year)&& (tm2->tm_mon==2))
11961213
tm->tm_mday++;
1214+
#endif
1215+
tm->tm_mday+=day_tab[isleap(tm2->tm_year)][tm2->tm_mon-1];
11971216
tm->tm_mon--;
11981217
}
11991218
}
@@ -2036,7 +2055,7 @@ static datetkn datetktbl[] = {
20362055
{"adt",DTZ,NEG(18)},/* Atlantic Daylight Time */
20372056
{"aesst",DTZ,66},/* E. Australia */
20382057
{"aest",TZ,60},/* Australia Eastern Std Time */
2039-
{"ahst",TZ,60},/* Alaska-Hawaii Std Time */
2058+
{"ahst",TZ,NEG(60)},/* Alaska-Hawaii Std Time */
20402059
{"allballs",RESERV,DTK_ZULU},/* 00:00:00 */
20412060
{"am",AMPM,AM},
20422061
{"apr",MONTH,4},
@@ -2087,12 +2106,12 @@ static datetkn datetktbl[] = {
20872106
{"hmt",DTZ,18},/* Hellas ? ? */
20882107
{"hst",TZ,NEG(60)},/* Hawaii Std Time */
20892108
{"idle",TZ,72},/* Intl. Date Line, East */
2090-
{"idlw",TZ,NEG(72)},/* Intl. Date Line,,est */
2109+
{"idlw",TZ,NEG(72)},/* Intl. Date Line, West */
20912110
{LATE,RESERV,DTK_LATE},/* "infinity" reserved for "late time" */
2092-
{INVALID,RESERV,DTK_INVALID},/* "invalid" reserved for invalid
2093-
* time */
2111+
{INVALID,RESERV,DTK_INVALID},
2112+
/* "invalid" reserved for invalid time */
20942113
{"ist",TZ,12},/* Israel */
2095-
{"it",TZ,22},/* Iran Time */
2114+
{"it",TZ,21},/* Iran Time */
20962115
{"jan",MONTH,1},
20972116
{"january",MONTH,1},
20982117
{"jst",TZ,54},/* Japan Std Time,USSR Zone 8 */
@@ -2283,6 +2302,8 @@ datetkn *deltacache[MAXDATEFIELDS] = {NULL};
22832302
* These routines will be used by other date/time packages - tgl 97/02/25
22842303
*/
22852304

2305+
#if0
2306+
XXXmovedtodt.h-thomas1999-01-15
22862307
/* Set the minimum year to one greater than the year of the first valid day
22872308
*to avoid having to check year and day both. - tgl 97/05/08
22882309
*/
@@ -2294,6 +2315,7 @@ datetkn *deltacache[MAXDATEFIELDS] = {NULL};
22942315
#defineIS_VALID_JULIAN(y,m,d) ((y > JULIAN_MINYEAR) \
22952316
|| ((y == JULIAN_MINYEAR) && ((m > JULIAN_MINMONTH) \
22962317
|| ((m == JULIAN_MINMONTH) && (d >= JULIAN_MINDAY)))))
2318+
#endif
22972319

22982320
int
22992321
date2j(inty,intm,intd)
@@ -2792,6 +2814,7 @@ DecodeDateTime(char **field, int *ftype, int nf,
27922814
intflen,
27932815
val;
27942816
intmer=HR24;
2817+
intis2digits= FALSE;
27952818
intbc= FALSE;
27962819

27972820
*dtype=DTK_DATE;
@@ -2843,14 +2866,14 @@ DecodeDateTime(char **field, int *ftype, int nf,
28432866
* then interpret as a concatenated date or time... */
28442867
if ((flen>4)&& !((fmask&DTK_DATE_M)&& (fmask&DTK_TIME_M)))
28452868
{
2846-
if (DecodeNumberField(flen,field[i],fmask,&tmask,tm,fsec)!=0)
2869+
if (DecodeNumberField(flen,field[i],fmask,&tmask,tm,fsec,&is2digits)!=0)
28472870
return-1;
28482871

28492872
}
28502873
/* otherwise it is a single date/time field... */
28512874
else
28522875
{
2853-
if (DecodeNumber(flen,field[i],fmask,&tmask,tm,fsec)!=0)
2876+
if (DecodeNumber(flen,field[i],fmask,&tmask,tm,fsec,&is2digits)!=0)
28542877
return-1;
28552878
}
28562879
break;
@@ -3009,6 +3032,13 @@ DecodeDateTime(char **field, int *ftype, int nf,
30093032
else
30103033
elog(ERROR,"Inconsistant use of year %04d and 'BC'",tm->tm_year);
30113034
}
3035+
elseif (is2digits)
3036+
{
3037+
if (tm->tm_year<70)
3038+
tm->tm_year+=2000;
3039+
elseif (tm->tm_year<100)
3040+
tm->tm_year+=1900;
3041+
}
30123042

30133043
if ((mer!=HR24)&& (tm->tm_hour>12))
30143044
return-1;
@@ -3083,6 +3113,7 @@ DecodeTimeOnly(char **field, int *ftype, int nf, int *dtype, struct tm * tm, dou
30833113
inti;
30843114
intflen,
30853115
val;
3116+
intis2digits= FALSE;
30863117
intmer=HR24;
30873118

30883119
*dtype=DTK_TIME;
@@ -3110,7 +3141,7 @@ DecodeTimeOnly(char **field, int *ftype, int nf, int *dtype, struct tm * tm, dou
31103141
caseDTK_NUMBER:
31113142
flen=strlen(field[i]);
31123143

3113-
if (DecodeNumberField(flen,field[i],fmask,&tmask,tm,fsec)!=0)
3144+
if (DecodeNumberField(flen,field[i],fmask,&tmask,tm,fsec,&is2digits)!=0)
31143145
return-1;
31153146
break;
31163147

@@ -3209,6 +3240,8 @@ DecodeDate(char *str, int fmask, int *tmask, struct tm * tm)
32093240
intnf=0;
32103241
inti,
32113242
len;
3243+
intbc= FALSE;
3244+
intis2digits= FALSE;
32123245
inttype,
32133246
val,
32143247
dmask=0;
@@ -3238,9 +3271,11 @@ DecodeDate(char *str, int fmask, int *tmask, struct tm * tm)
32383271
nf++;
32393272
}
32403273

3274+
#if0
32413275
/* don't allow too many fields */
32423276
if (nf>3)
32433277
return-1;
3278+
#endif
32443279

32453280
*tmask=0;
32463281

@@ -3263,6 +3298,10 @@ DecodeDate(char *str, int fmask, int *tmask, struct tm * tm)
32633298
tm->tm_mon=val;
32643299
break;
32653300

3301+
caseADBC:
3302+
bc= (val==BC);
3303+
break;
3304+
32663305
default:
32673306
#ifdefDATEDEBUG
32683307
printf("DecodeDate- illegal field %s value is %d\n",field[i],val);
@@ -3289,7 +3328,7 @@ DecodeDate(char *str, int fmask, int *tmask, struct tm * tm)
32893328
if ((len=strlen(field[i])) <=0)
32903329
return-1;
32913330

3292-
if (DecodeNumber(len,field[i],fmask,&dmask,tm,&fsec)!=0)
3331+
if (DecodeNumber(len,field[i],fmask,&dmask,tm,&fsec,&is2digits)!=0)
32933332
return-1;
32943333

32953334
if (fmask&dmask)
@@ -3299,6 +3338,25 @@ DecodeDate(char *str, int fmask, int *tmask, struct tm * tm)
32993338
*tmask |=dmask;
33003339
}
33013340

3341+
if ((fmask& ~(DTK_M(DOY) |DTK_M(TZ)))!=DTK_DATE_M)
3342+
return-1;
3343+
3344+
/* there is no year zero in AD/BC notation; i.e. "1 BC" == year 0 */
3345+
if (bc)
3346+
{
3347+
if (tm->tm_year>0)
3348+
tm->tm_year=-(tm->tm_year-1);
3349+
else
3350+
elog(ERROR,"Inconsistant use of year %04d and 'BC'",tm->tm_year);
3351+
}
3352+
elseif (is2digits)
3353+
{
3354+
if (tm->tm_year<70)
3355+
tm->tm_year+=2000;
3356+
elseif (tm->tm_year<100)
3357+
tm->tm_year+=1900;
3358+
}
3359+
33023360
return0;
33033361
}/* DecodeDate() */
33043362

@@ -3362,7 +3420,8 @@ DecodeTime(char *str, int fmask, int *tmask, struct tm * tm, double *fsec)
33623420
* Interpret numeric field as a date value in context.
33633421
*/
33643422
staticint
3365-
DecodeNumber(intflen,char*str,intfmask,int*tmask,structtm*tm,double*fsec)
3423+
DecodeNumber(intflen,char*str,intfmask,
3424+
int*tmask,structtm*tm,double*fsec,int*is2digits)
33663425
{
33673426
intval;
33683427
char*cp;
@@ -3475,13 +3534,16 @@ DecodeNumber(int flen, char *str, int fmask, int *tmask, struct tm * tm, double
34753534
tm->tm_year=val;
34763535

34773536
/* adjust ONLY if exactly two digits... */
3537+
#if0
34783538
if (flen==2)
34793539
{
34803540
if (tm->tm_year<70)
34813541
tm->tm_year+=2000;
34823542
elseif (tm->tm_year<100)
34833543
tm->tm_year+=1900;
34843544
}
3545+
#endif
3546+
*is2digits= (flen==2);
34853547

34863548
}
34873549
else
@@ -3495,7 +3557,8 @@ DecodeNumber(int flen, char *str, int fmask, int *tmask, struct tm * tm, double
34953557
* Interpret numeric string as a concatenated date field.
34963558
*/
34973559
staticint
3498-
DecodeNumberField(intlen,char*str,intfmask,int*tmask,structtm*tm,double*fsec)
3560+
DecodeNumberField(intlen,char*str,intfmask,
3561+
int*tmask,structtm*tm,double*fsec,int*is2digits)
34993562
{
35003563
char*cp;
35013564

@@ -3546,10 +3609,13 @@ DecodeNumberField(int len, char *str, int fmask, int *tmask, struct tm * tm, dou
35463609
*(str+2)='\0';
35473610
tm->tm_year=atoi(str+0);
35483611

3612+
#if0
35493613
if (tm->tm_year<70)
35503614
tm->tm_year+=2000;
35513615
elseif (tm->tm_year<100)
35523616
tm->tm_year+=1900;
3617+
#endif
3618+
*is2digits= TRUE;
35533619
}
35543620

35553621
}
@@ -3564,10 +3630,13 @@ DecodeNumberField(int len, char *str, int fmask, int *tmask, struct tm * tm, dou
35643630
tm->tm_mon=1;
35653631
tm->tm_year=atoi(str+0);
35663632

3633+
#if0
35673634
if (tm->tm_year<70)
35683635
tm->tm_year+=2000;
35693636
elseif (tm->tm_year<100)
35703637
tm->tm_year+=1900;
3638+
#endif
3639+
*is2digits= TRUE;
35713640
}
35723641
elseif (strchr(str,'.')!=NULL)
35733642
{

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