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2020f90bf6
This patch absorbs a few unreleased fixes in the IANA code. It corresponds to commit 2d8b944c1cec0808ac4f7a9ee1a463c28f9cd00a in https://github.com/eggert/tz. Non-cosmetic changes include: TZDEFRULESTRING is updated to match current US DST practice, rather than what it was over ten years ago. This only matters for interpretation of POSIX-style zone names (e.g., "EST5EDT"), and only if the timezone database doesn't include either an exact match for the zone name or a "posixrules" entry. The latter should not be true in any current Postgres installation, but this could possibly matter when using --with-system-tzdata. Get rid of a nonportable use of "++var" on a bool var. This is part of a larger fix that eliminates some vestigial support for consecutive leap seconds, and adds checks to the "zic" compiler that the data files do not specify that. Remove a couple of ancient compatibility hacks. The IANA crew think these are obsolete, and I tend to agree. But perhaps our buildfarm will think different. Back-patch to all supported branches, in line with our policy that all branches should be using current IANA code. Before v10, this includes application of current pgindent rules, to avoid whitespace problems in future back-patches. Discussion: https://postgr.es/m/E1dsWhf-0000pT-F9@gemulon.postgresql.org
153 lines
3.9 KiB
C
153 lines
3.9 KiB
C
#ifndef PRIVATE_H
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#define PRIVATE_H
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/*
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* This file is in the public domain, so clarified as of
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* 1996-06-05 by Arthur David Olson.
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*
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* IDENTIFICATION
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* src/timezone/private.h
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*/
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/*
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* This header is for use ONLY with the time conversion code.
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* There is no guarantee that it will remain unchanged,
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* or that it will remain at all.
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* Do NOT copy it to any system include directory.
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* Thank you!
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*/
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#include <limits.h> /* for CHAR_BIT et al. */
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#include <sys/wait.h> /* for WIFEXITED and WEXITSTATUS */
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#include <unistd.h> /* for F_OK and R_OK */
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#include "pgtime.h"
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/* This string was in the Factory zone through version 2016f. */
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#define GRANDPARENTED "Local time zone must be set--see zic manual page"
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/*
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* IANA has a bunch of HAVE_FOO #defines here, but in PG we want pretty
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* much all of that to be done by PG's configure script.
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*/
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#ifndef ENOTSUP
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#define ENOTSUP EINVAL
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#endif
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#ifndef EOVERFLOW
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#define EOVERFLOW EINVAL
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#endif
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/* Unlike <ctype.h>'s isdigit, this also works if c < 0 | c > UCHAR_MAX. */
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#define is_digit(c) ((unsigned)(c) - '0' <= 9)
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/*
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* Finally, some convenience items.
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*/
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#define TYPE_BIT(type) (sizeof (type) * CHAR_BIT)
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#define TYPE_SIGNED(type) (((type) -1) < 0)
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#define TWOS_COMPLEMENT(t) ((t) ~ (t) 0 < 0)
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/*
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* Max and min values of the integer type T, of which only the bottom
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* B bits are used, and where the highest-order used bit is considered
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* to be a sign bit if T is signed.
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*/
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#define MAXVAL(t, b) \
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((t) (((t) 1 << ((b) - 1 - TYPE_SIGNED(t))) \
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- 1 + ((t) 1 << ((b) - 1 - TYPE_SIGNED(t)))))
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#define MINVAL(t, b) \
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((t) (TYPE_SIGNED(t) ? - TWOS_COMPLEMENT(t) - MAXVAL(t, b) : 0))
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/* The extreme time values, assuming no padding. */
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#define TIME_T_MIN MINVAL(pg_time_t, TYPE_BIT(pg_time_t))
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#define TIME_T_MAX MAXVAL(pg_time_t, TYPE_BIT(pg_time_t))
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/*
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* 302 / 1000 is log10(2.0) rounded up.
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* Subtract one for the sign bit if the type is signed;
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* add one for integer division truncation;
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* add one more for a minus sign if the type is signed.
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*/
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#define INT_STRLEN_MAXIMUM(type) \
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((TYPE_BIT(type) - TYPE_SIGNED(type)) * 302 / 1000 + \
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1 + TYPE_SIGNED(type))
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/*
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* INITIALIZE(x)
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*/
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#define INITIALIZE(x) ((x) = 0)
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#undef _
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#define _(msgid) (msgid)
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/* Handy macros that are independent of tzfile implementation. */
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#define YEARSPERREPEAT 400 /* years before a Gregorian repeat */
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#define SECSPERMIN 60
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#define MINSPERHOUR 60
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#define HOURSPERDAY 24
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#define DAYSPERWEEK 7
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#define DAYSPERNYEAR 365
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#define DAYSPERLYEAR 366
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#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
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#define SECSPERDAY ((int32) SECSPERHOUR * HOURSPERDAY)
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#define MONSPERYEAR 12
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#define TM_SUNDAY 0
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#define TM_MONDAY 1
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#define TM_TUESDAY 2
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#define TM_WEDNESDAY 3
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#define TM_THURSDAY 4
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#define TM_FRIDAY 5
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#define TM_SATURDAY 6
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#define TM_JANUARY 0
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#define TM_FEBRUARY 1
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#define TM_MARCH 2
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#define TM_APRIL 3
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#define TM_MAY 4
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#define TM_JUNE 5
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#define TM_JULY 6
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#define TM_AUGUST 7
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#define TM_SEPTEMBER 8
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#define TM_OCTOBER 9
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#define TM_NOVEMBER 10
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#define TM_DECEMBER 11
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#define TM_YEAR_BASE 1900
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#define EPOCH_YEAR 1970
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#define EPOCH_WDAY TM_THURSDAY
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#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
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/*
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* Since everything in isleap is modulo 400 (or a factor of 400), we know that
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* isleap(y) == isleap(y % 400)
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* and so
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* isleap(a + b) == isleap((a + b) % 400)
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* or
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* isleap(a + b) == isleap(a % 400 + b % 400)
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* This is true even if % means modulo rather than Fortran remainder
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* (which is allowed by C89 but not by C99 or later).
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* We use this to avoid addition overflow problems.
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*/
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#define isleap_sum(a, b) isleap((a) % 400 + (b) % 400)
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/*
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* The Gregorian year averages 365.2425 days, which is 31556952 seconds.
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*/
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#define AVGSECSPERYEAR 31556952L
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#define SECSPERREPEAT \
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((int64) YEARSPERREPEAT * (int64) AVGSECSPERYEAR)
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#define SECSPERREPEAT_BITS 34 /* ceil(log2(SECSPERREPEAT)) */
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#endif /* !defined PRIVATE_H */
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