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Commit6872d96

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Sync our copy of the timezone library with IANA release tzcode2017b.
zic no longer mishandles some transitions in January 2038 when itattempts to work around Qt bug 53071. This fixes a bug affectingPacific/Tongatapu that was introduced in zic 2016e. localtime.cnow contains a workaround, useful when loading a file generated bya buggy zic.There are assorted cosmetic changes as well, notably relocationof a bunch of #defines.
1 parent0a65b18 commit6872d96

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7 files changed

+139
-99
lines changed

7 files changed

+139
-99
lines changed

‎src/timezone/README‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -50,7 +50,7 @@ match properly on the old version.
5050
Time Zone code
5151
==============
5252

53-
The code in this directory is currently synced with tzcode release2016j.
53+
The code in this directory is currently synced with tzcode release2017b.
5454
There are many cosmetic (and not so cosmetic) differences from the
5555
original tzcode library, but diffs in the upstream version should usually
5656
be propagated to our version. Here are some notes about that.

‎src/timezone/localtime.c‎

Lines changed: 56 additions & 17 deletions
Original file line numberDiff line numberDiff line change
@@ -17,8 +17,9 @@
1717
#include<fcntl.h>
1818

1919
#include"datatype/timestamp.h"
20-
#include"private.h"
2120
#include"pgtz.h"
21+
22+
#include"private.h"
2223
#include"tzfile.h"
2324

2425

@@ -414,10 +415,10 @@ tzloadbody(char const * name, char *canonname, struct state * sp, bool doextend,
414415
{
415416
/*
416417
* Attempt to reuse existing abbreviations. Without this,
417-
* America/Anchorage wouldstop working after 2037 when
418-
* TZ_MAX_CHARS is 50, as sp->charcnt equals42 (for LMTCAT CAWT
419-
*CAPT AHST AHDT YST AKDT AKST) and ts->charcnt equals 10 (for
420-
* AKST AKDT). Reusing means sp->charcnt can stay42 in this
418+
* America/Anchorage wouldbe right on the edge after 2037 when
419+
* TZ_MAX_CHARS is 50, as sp->charcnt equals40 (for LMTAST AWT
420+
*APT AHST AHDT YST AKDT AKST) and ts->charcnt equals 10 (for
421+
* AKST AKDT). Reusing means sp->charcnt can stay40 in this
421422
* example.
422423
*/
423424
intgotabbr=0;
@@ -451,6 +452,17 @@ tzloadbody(char const * name, char *canonname, struct state * sp, bool doextend,
451452
if (gotabbr==2)
452453
{
453454
sp->charcnt=charcnt;
455+
456+
/*
457+
* Ignore any trailing, no-op transitions generated by zic as
458+
* they don't help here and can run afoul of bugs in zic 2016j
459+
* or earlier.
460+
*/
461+
while (1<sp->timecnt
462+
&& (sp->types[sp->timecnt-1]
463+
==sp->types[sp->timecnt-2]))
464+
sp->timecnt--;
465+
454466
for (i=0;i<ts->timecnt;i++)
455467
if (sp->ats[sp->timecnt-1]<ts->ats[i])
456468
break;
@@ -974,6 +986,8 @@ tzparse(const char *name, struct state * sp, bool lastditch)
974986
intyearlim;
975987
inttimecnt;
976988
pg_time_tjanfirst;
989+
int32janoffset=0;
990+
intyearbeg;
977991

978992
++name;
979993
if ((name=getrule(name,&start))==NULL)
@@ -994,8 +1008,23 @@ tzparse(const char *name, struct state * sp, bool lastditch)
9941008
sp->defaulttype=0;
9951009
timecnt=0;
9961010
janfirst=0;
997-
yearlim=EPOCH_YEAR+YEARSPERREPEAT;
998-
for (year=EPOCH_YEAR;year<yearlim;year++)
1011+
yearbeg=EPOCH_YEAR;
1012+
1013+
do
1014+
{
1015+
int32yearsecs
1016+
=year_lengths[isleap(yearbeg-1)]*SECSPERDAY;
1017+
1018+
yearbeg--;
1019+
if (increment_overflow_time(&janfirst,-yearsecs))
1020+
{
1021+
janoffset=-yearsecs;
1022+
break;
1023+
}
1024+
}while (EPOCH_YEAR-YEARSPERREPEAT /2<yearbeg);
1025+
1026+
yearlim=yearbeg+YEARSPERREPEAT+1;
1027+
for (year=yearbeg;year<yearlim;year++)
9991028
{
10001029
int32
10011030
starttime=transtime(year,&start,stdoffset),
@@ -1020,24 +1049,34 @@ tzparse(const char *name, struct state * sp, bool lastditch)
10201049
{
10211050
if (TZ_MAX_TIMES-2<timecnt)
10221051
break;
1023-
yearlim=year+YEARSPERREPEAT+1;
10241052
sp->ats[timecnt]=janfirst;
1025-
if (increment_overflow_time
1026-
(&sp->ats[timecnt],starttime))
1027-
break;
1028-
sp->types[timecnt++]=reversed;
1053+
if (!increment_overflow_time
1054+
(&sp->ats[timecnt],
1055+
janoffset+starttime))
1056+
sp->types[timecnt++]=reversed;
1057+
elseif (janoffset)
1058+
sp->defaulttype=reversed;
10291059
sp->ats[timecnt]=janfirst;
1030-
if (increment_overflow_time
1031-
(&sp->ats[timecnt],endtime))
1032-
break;
1033-
sp->types[timecnt++]= !reversed;
1060+
if (!increment_overflow_time
1061+
(&sp->ats[timecnt],
1062+
janoffset+endtime))
1063+
{
1064+
sp->types[timecnt++]= !reversed;
1065+
yearlim=year+YEARSPERREPEAT+1;
1066+
}
1067+
elseif (janoffset)
1068+
sp->defaulttype= !reversed;
10341069
}
1035-
if (increment_overflow_time(&janfirst,yearsecs))
1070+
if (increment_overflow_time
1071+
(&janfirst,janoffset+yearsecs))
10361072
break;
1073+
janoffset=0;
10371074
}
10381075
sp->timecnt=timecnt;
10391076
if (!timecnt)
10401077
sp->typecnt=1;/* Perpetual DST. */
1078+
elseif (YEARSPERREPEAT<year-yearbeg)
1079+
sp->goback=sp->goahead= true;
10411080
}
10421081
else
10431082
{

‎src/timezone/pgtz.c‎

Lines changed: 5 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -17,6 +17,7 @@
1717
#include<sys/stat.h>
1818
#include<time.h>
1919

20+
#include"datatype/timestamp.h"
2021
#include"miscadmin.h"
2122
#include"pgtz.h"
2223
#include"storage/fd.h"
@@ -308,14 +309,14 @@ pg_tzset_offset(long gmtoffset)
308309
chartzname[128];
309310

310311
snprintf(offsetstr,sizeof(offsetstr),
311-
"%02ld",absoffset /SECSPERHOUR);
312-
absoffset %=SECSPERHOUR;
312+
"%02ld",absoffset /SECS_PER_HOUR);
313+
absoffset %=SECS_PER_HOUR;
313314
if (absoffset!=0)
314315
{
315316
snprintf(offsetstr+strlen(offsetstr),
316317
sizeof(offsetstr)-strlen(offsetstr),
317-
":%02ld",absoffset /SECSPERMIN);
318-
absoffset %=SECSPERMIN;
318+
":%02ld",absoffset /SECS_PER_MINUTE);
319+
absoffset %=SECS_PER_MINUTE;
319320
if (absoffset!=0)
320321
snprintf(offsetstr+strlen(offsetstr),
321322
sizeof(offsetstr)-strlen(offsetstr),

‎src/timezone/private.h‎

Lines changed: 57 additions & 19 deletions
Original file line numberDiff line numberDiff line change
@@ -67,14 +67,8 @@ extern intunlink(const char *filename);
6767
* Finally, some convenience items.
6868
*/
6969

70-
#ifndefTYPE_BIT
7170
#defineTYPE_BIT(type)(sizeof (type) * CHAR_BIT)
72-
#endif/* !defined TYPE_BIT */
73-
74-
#ifndefTYPE_SIGNED
7571
#defineTYPE_SIGNED(type) (((type) -1) < 0)
76-
#endif/* !defined TYPE_SIGNED */
77-
7872
#defineTWOS_COMPLEMENT(t) ((t) ~ (t) 0 < 0)
7973

8074
/*
@@ -88,7 +82,6 @@ extern intunlink(const char *filename);
8882
#defineMINVAL(t,b)\
8983
((t) (TYPE_SIGNED(t) ? - TWOS_COMPLEMENT(t) - MAXVAL(t, b) : 0))
9084

91-
#ifndefINT_STRLEN_MAXIMUM
9285
/*
9386
* 302 / 1000 is log10(2.0) rounded up.
9487
* Subtract one for the sign bit if the type is signed;
@@ -98,7 +91,6 @@ extern intunlink(const char *filename);
9891
#defineINT_STRLEN_MAXIMUM(type) \
9992
((TYPE_BIT(type) - TYPE_SIGNED(type)) * 302 / 1000 + \
10093
1 + TYPE_SIGNED(type))
101-
#endif/* !defined INT_STRLEN_MAXIMUM */
10294

10395
/*
10496
* INITIALIZE(x)
@@ -108,24 +100,70 @@ extern intunlink(const char *filename);
108100
#undef _
109101
#define_(msgid) (msgid)
110102

111-
#ifndefYEARSPERREPEAT
103+
/* Handy macros that are independent of tzfile implementation. */
104+
112105
#defineYEARSPERREPEAT400/* years before a Gregorian repeat */
113-
#endif/* !defined YEARSPERREPEAT */
106+
107+
#defineSECSPERMIN60
108+
#defineMINSPERHOUR 60
109+
#defineHOURSPERDAY 24
110+
#defineDAYSPERWEEK 7
111+
#defineDAYSPERNYEAR365
112+
#defineDAYSPERLYEAR366
113+
#defineSECSPERHOUR (SECSPERMIN * MINSPERHOUR)
114+
#defineSECSPERDAY((int32) SECSPERHOUR * HOURSPERDAY)
115+
#defineMONSPERYEAR 12
116+
117+
#defineTM_SUNDAY0
118+
#defineTM_MONDAY1
119+
#defineTM_TUESDAY2
120+
#defineTM_WEDNESDAY3
121+
#defineTM_THURSDAY 4
122+
#defineTM_FRIDAY5
123+
#defineTM_SATURDAY 6
124+
125+
#defineTM_JANUARY0
126+
#defineTM_FEBRUARY 1
127+
#defineTM_MARCH2
128+
#defineTM_APRIL3
129+
#defineTM_MAY4
130+
#defineTM_JUNE5
131+
#defineTM_JULY6
132+
#defineTM_AUGUST7
133+
#defineTM_SEPTEMBER8
134+
#defineTM_OCTOBER9
135+
#defineTM_NOVEMBER 10
136+
#defineTM_DECEMBER 11
137+
138+
#defineTM_YEAR_BASE1900
139+
140+
#defineEPOCH_YEAR1970
141+
#defineEPOCH_WDAYTM_THURSDAY
142+
143+
#defineisleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
114144

115145
/*
116-
* The Gregorian year averages 365.2425 days, which is 31556952 seconds.
146+
* Since everything in isleap is modulo 400 (or a factor of 400), we know that
147+
*isleap(y) == isleap(y % 400)
148+
* and so
149+
*isleap(a + b) == isleap((a + b) % 400)
150+
* or
151+
*isleap(a + b) == isleap(a % 400 + b % 400)
152+
* This is true even if % means modulo rather than Fortran remainder
153+
* (which is allowed by C89 but not C99).
154+
* We use this to avoid addition overflow problems.
117155
*/
118156

119-
#ifndefAVGSECSPERYEAR
120-
#defineAVGSECSPERYEAR31556952L
121-
#endif/* !defined AVGSECSPERYEAR */
157+
#defineisleap_sum(a,b)isleap((a) % 400 + (b) % 400)
122158

123-
#ifndefSECSPERREPEAT
124-
#defineSECSPERREPEAT((int64) YEARSPERREPEAT * (int64) AVGSECSPERYEAR)
125-
#endif/* !defined SECSPERREPEAT */
126159

127-
#ifndefSECSPERREPEAT_BITS
160+
/*
161+
* The Gregorian year averages 365.2425 days, which is 31556952 seconds.
162+
*/
163+
164+
#defineAVGSECSPERYEAR31556952L
165+
#defineSECSPERREPEAT \
166+
((int64) YEARSPERREPEAT * (int64) AVGSECSPERYEAR)
128167
#defineSECSPERREPEAT_BITS34/* ceil(log2(SECSPERREPEAT)) */
129-
#endif/* !defined SECSPERREPEAT_BITS */
130168

131169
#endif/* !defined PRIVATE_H */

‎src/timezone/strftime.c‎

Lines changed: 8 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
/* Convert a broken-downtime stamp to a string. */
1+
/* Convert a broken-downtimestamp to a string. */
22

33
/*
44
* Copyright 1989 The Regents of the University of California.
@@ -44,7 +44,6 @@
4444
#include<locale.h>
4545

4646
#include"private.h"
47-
#include"tzfile.h"
4847

4948

5049
structlc_time_T
@@ -452,11 +451,17 @@ _fmt(const char *format, const struct pg_tm * t, char *pt, const char *ptlim,
452451
{
453452
longdiff;
454453
charconst*sign;
454+
boolnegative;
455455

456456
if (t->tm_isdst<0)
457457
continue;
458458
diff=t->tm_gmtoff;
459-
if (diff<0)
459+
negative=diff<0;
460+
if (diff==0)
461+
{
462+
negative=t->tm_zone[0]=='-';
463+
}
464+
if (negative)
460465
{
461466
sign="-";
462467
diff=-diff;

‎src/timezone/tzfile.h‎

Lines changed: 0 additions & 52 deletions
Original file line numberDiff line numberDiff line change
@@ -100,56 +100,4 @@ struct tzhead
100100

101101
#defineTZ_MAX_LEAPS50/* Maximum number of leap second corrections */
102102

103-
#defineSECSPERMIN60
104-
#defineMINSPERHOUR 60
105-
#defineHOURSPERDAY 24
106-
#defineDAYSPERWEEK 7
107-
#defineDAYSPERNYEAR365
108-
#defineDAYSPERLYEAR366
109-
#defineSECSPERHOUR (SECSPERMIN * MINSPERHOUR)
110-
#defineSECSPERDAY((int32) SECSPERHOUR * HOURSPERDAY)
111-
#defineMONSPERYEAR 12
112-
113-
#defineTM_SUNDAY0
114-
#defineTM_MONDAY1
115-
#defineTM_TUESDAY2
116-
#defineTM_WEDNESDAY3
117-
#defineTM_THURSDAY 4
118-
#defineTM_FRIDAY5
119-
#defineTM_SATURDAY 6
120-
121-
#defineTM_JANUARY0
122-
#defineTM_FEBRUARY 1
123-
#defineTM_MARCH2
124-
#defineTM_APRIL3
125-
#defineTM_MAY4
126-
#defineTM_JUNE5
127-
#defineTM_JULY6
128-
#defineTM_AUGUST7
129-
#defineTM_SEPTEMBER8
130-
#defineTM_OCTOBER9
131-
#defineTM_NOVEMBER 10
132-
#defineTM_DECEMBER 11
133-
134-
#defineTM_YEAR_BASE1900
135-
136-
#defineEPOCH_YEAR1970
137-
#defineEPOCH_WDAYTM_THURSDAY
138-
139-
#defineisleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
140-
141-
/*
142-
* Since everything in isleap is modulo 400 (or a factor of 400), we know that
143-
* isleap(y) == isleap(y % 400)
144-
* and so
145-
* isleap(a + b) == isleap((a + b) % 400)
146-
* or
147-
* isleap(a + b) == isleap(a % 400 + b % 400)
148-
* This is true even if % means modulo rather than Fortran remainder
149-
* (which is allowed by C89 but not C99).
150-
* We use this to avoid addition overflow problems.
151-
*/
152-
153-
#defineisleap_sum(a,b)isleap((a) % 400 + (b) % 400)
154-
155103
#endif/* !defined TZFILE_H */

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