160 lines
4.0 KiB
C
160 lines
4.0 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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#define strtoimax strtoll
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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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