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7898d01da3
This corrects a small bug in zic that caused it to output an incorrect year-2440 transition in the Africa/Casablanca zone. More interestingly, zic has grown a "-r" option that limits the range of zone transitions that it will put into the output files. That might be useful to people who don't like the weird GMT offsets that tzdb likes to use for very old dates. It appears that for dates before the cutoff time specified with -r, zic will use the zone's standard-time offset as of the cutoff time. So for example one might do make install ZIC_OPTIONS='-r @-1893456000' to cause all dates before 1910-01-01 to be treated as though 1910 standard time prevailed indefinitely far back. (Don't blame me for the unfriendly way of specifying the cutoff time --- it's seconds since or before the Unix epoch. You can use extract(epoch ...) to calculate it.) As usual, back-patch to all supported branches.
164 lines
4.1 KiB
C
164 lines
4.1 KiB
C
/* Private header for tzdb code. */
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#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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/* PG doesn't currently rely on <inttypes.h>, so work around strtoimax() */
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#undef strtoimax
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#ifdef HAVE_STRTOLL
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#define strtoimax strtoll
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#else
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#define strtoimax strtol
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#endif
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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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