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Sync our copy of the timezone library with IANA release tzcode2017b.

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zic no longer mishandles some transitions in January 2038 when it
attempts to work around Qt bug 53071.  This fixes a bug affecting
Pacific/Tongatapu that was introduced in zic 2016e.  localtime.c
now contains a workaround, useful when loading a file generated by
a buggy zic.

There are assorted cosmetic changes as well, notably relocation
of a bunch of #defines.
This commit is contained in:
Tom Lane
2017-04-30 15:13:51 -04:00
parent 954744f7ac
commit f8cf9719d6
7 changed files with 139 additions and 99 deletions
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76
src/timezone/private.h
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@ -67,14 +67,8 @@ extern int unlink(const char *filename);
* Finally, some convenience items.
*/
#ifndef TYPE_BIT
#define TYPE_BIT(type) (sizeof (type) * CHAR_BIT)
#endif /* !defined TYPE_BIT */
#ifndef TYPE_SIGNED
#define TYPE_SIGNED(type) (((type) -1) < 0)
#endif /* !defined TYPE_SIGNED */
#define TWOS_COMPLEMENT(t) ((t) ~ (t) 0 < 0)
/*
@ -88,7 +82,6 @@ extern int unlink(const char *filename);
#define MINVAL(t, b) \
((t) (TYPE_SIGNED(t) ? - TWOS_COMPLEMENT(t) - MAXVAL(t, b) : 0))
#ifndef INT_STRLEN_MAXIMUM
/*
* 302 / 1000 is log10(2.0) rounded up.
* Subtract one for the sign bit if the type is signed;
@ -98,7 +91,6 @@ extern int unlink(const char *filename);
#define INT_STRLEN_MAXIMUM(type) \
((TYPE_BIT(type) - TYPE_SIGNED(type)) * 302 / 1000 + \
1 + TYPE_SIGNED(type))
#endif /* !defined INT_STRLEN_MAXIMUM */
/*
* INITIALIZE(x)
@ -108,24 +100,70 @@ extern int unlink(const char *filename);
#undef _
#define _(msgid) (msgid)
#ifndef YEARSPERREPEAT
/* Handy macros that are independent of tzfile implementation. */
#define YEARSPERREPEAT 400 /* years before a Gregorian repeat */
#endif /* !defined YEARSPERREPEAT */
#define SECSPERMIN 60
#define MINSPERHOUR 60
#define HOURSPERDAY 24
#define DAYSPERWEEK 7
#define DAYSPERNYEAR 365
#define DAYSPERLYEAR 366
#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
#define SECSPERDAY ((int32) SECSPERHOUR * HOURSPERDAY)
#define MONSPERYEAR 12
#define TM_SUNDAY 0
#define TM_MONDAY 1
#define TM_TUESDAY 2
#define TM_WEDNESDAY 3
#define TM_THURSDAY 4
#define TM_FRIDAY 5
#define TM_SATURDAY 6
#define TM_JANUARY 0
#define TM_FEBRUARY 1
#define TM_MARCH 2
#define TM_APRIL 3
#define TM_MAY 4
#define TM_JUNE 5
#define TM_JULY 6
#define TM_AUGUST 7
#define TM_SEPTEMBER 8
#define TM_OCTOBER 9
#define TM_NOVEMBER 10
#define TM_DECEMBER 11
#define TM_YEAR_BASE 1900
#define EPOCH_YEAR 1970
#define EPOCH_WDAY TM_THURSDAY
#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
/*
* Since everything in isleap is modulo 400 (or a factor of 400), we know that
* isleap(y) == isleap(y % 400)
* and so
* isleap(a + b) == isleap((a + b) % 400)
* or
* isleap(a + b) == isleap(a % 400 + b % 400)
* This is true even if % means modulo rather than Fortran remainder
* (which is allowed by C89 but not C99).
* We use this to avoid addition overflow problems.
*/
#define isleap_sum(a, b) isleap((a) % 400 + (b) % 400)
/*
* The Gregorian year averages 365.2425 days, which is 31556952 seconds.
*/
#ifndef AVGSECSPERYEAR
#define AVGSECSPERYEAR 31556952L
#endif /* !defined AVGSECSPERYEAR */
#ifndef SECSPERREPEAT
#define SECSPERREPEAT ((int64) YEARSPERREPEAT * (int64) AVGSECSPERYEAR)
#endif /* !defined SECSPERREPEAT */
#ifndef SECSPERREPEAT_BITS
#define SECSPERREPEAT \
((int64) YEARSPERREPEAT * (int64) AVGSECSPERYEAR)
#define SECSPERREPEAT_BITS 34 /* ceil(log2(SECSPERREPEAT)) */
#endif /* !defined SECSPERREPEAT_BITS */
#endif /* !defined PRIVATE_H */