diff options
Diffstat (limited to '')
| -rw-r--r-- | src/timezone/private.h | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/src/timezone/private.h b/src/timezone/private.h new file mode 100644 index 0000000..533e3d9 --- /dev/null +++ b/src/timezone/private.h @@ -0,0 +1,163 @@ +/* Private header for tzdb code. */ + +#ifndef PRIVATE_H + +#define PRIVATE_H + +/* + * This file is in the public domain, so clarified as of + * 1996-06-05 by Arthur David Olson. + * + * IDENTIFICATION + * src/timezone/private.h + */ + +/* + * This header is for use ONLY with the time conversion code. + * There is no guarantee that it will remain unchanged, + * or that it will remain at all. + * Do NOT copy it to any system include directory. + * Thank you! + */ + +#include <limits.h> /* for CHAR_BIT et al. */ +#include <sys/wait.h> /* for WIFEXITED and WEXITSTATUS */ +#include <unistd.h> /* for F_OK and R_OK */ + +#include "pgtime.h" + +/* This string was in the Factory zone through version 2016f. */ +#define GRANDPARENTED "Local time zone must be set--see zic manual page" + +/* + * IANA has a bunch of HAVE_FOO #defines here, but in PG we want pretty + * much all of that to be done by PG's configure script. + */ + +#ifndef ENOTSUP +#define ENOTSUP EINVAL +#endif +#ifndef EOVERFLOW +#define EOVERFLOW EINVAL +#endif + +/* Unlike <ctype.h>'s isdigit, this also works if c < 0 | c > UCHAR_MAX. */ +#define is_digit(c) ((unsigned)(c) - '0' <= 9) + +/* PG doesn't currently rely on <inttypes.h>, so work around strtoimax() */ +#undef strtoimax +#ifdef HAVE_STRTOLL +#define strtoimax strtoll +#else +#define strtoimax strtol +#endif + + +/* + * Finally, some convenience items. + */ + +#define TYPE_BIT(type) (sizeof (type) * CHAR_BIT) +#define TYPE_SIGNED(type) (((type) -1) < 0) +#define TWOS_COMPLEMENT(t) ((t) ~ (t) 0 < 0) + +/* + * Max and min values of the integer type T, of which only the bottom + * B bits are used, and where the highest-order used bit is considered + * to be a sign bit if T is signed. + */ +#define MAXVAL(t, b) \ + ((t) (((t) 1 << ((b) - 1 - TYPE_SIGNED(t))) \ + - 1 + ((t) 1 << ((b) - 1 - TYPE_SIGNED(t))))) +#define MINVAL(t, b) \ + ((t) (TYPE_SIGNED(t) ? - TWOS_COMPLEMENT(t) - MAXVAL(t, b) : 0)) + +/* The extreme time values, assuming no padding. */ +#define TIME_T_MIN MINVAL(pg_time_t, TYPE_BIT(pg_time_t)) +#define TIME_T_MAX MAXVAL(pg_time_t, TYPE_BIT(pg_time_t)) + +/* + * 302 / 1000 is log10(2.0) rounded up. + * Subtract one for the sign bit if the type is signed; + * add one for integer division truncation; + * add one more for a minus sign if the type is signed. + */ +#define INT_STRLEN_MAXIMUM(type) \ + ((TYPE_BIT(type) - TYPE_SIGNED(type)) * 302 / 1000 + \ + 1 + TYPE_SIGNED(type)) + +/* + * INITIALIZE(x) + */ +#define INITIALIZE(x) ((x) = 0) + +#undef _ +#define _(msgid) (msgid) + +/* Handy macros that are independent of tzfile implementation. */ + +#define YEARSPERREPEAT 400 /* years before a Gregorian repeat */ + +#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 by C99 or later). + * 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. + */ + +#define AVGSECSPERYEAR 31556952L +#define SECSPERREPEAT \ + ((int64) YEARSPERREPEAT * (int64) AVGSECSPERYEAR) +#define SECSPERREPEAT_BITS 34 /* ceil(log2(SECSPERREPEAT)) */ + +#endif /* !defined PRIVATE_H */ |