1/* Private header for tzdb code. */
2
3#ifndef PRIVATE_H
4
5#define PRIVATE_H
6
7/*
8 * This file is in the public domain, so clarified as of
9 * 1996-06-05 by Arthur David Olson.
10 *
11 * IDENTIFICATION
12 * src/timezone/private.h
13 */
14
15/*
16 * This header is for use ONLY with the time conversion code.
17 * There is no guarantee that it will remain unchanged,
18 * or that it will remain at all.
19 * Do NOT copy it to any system include directory.
20 * Thank you!
21 */
22
23#include <limits.h> /* for CHAR_BIT et al. */
24#include <sys/wait.h> /* for WIFEXITED and WEXITSTATUS */
25#include <unistd.h> /* for F_OK and R_OK */
26
27#include "pgtime.h"
28
29/* This string was in the Factory zone through version 2016f. */
30#define GRANDPARENTED "Local time zone must be set--see zic manual page"
31
32/*
33 * IANA has a bunch of HAVE_FOO #defines here, but in PG we want pretty
34 * much all of that to be done by PG's configure script.
35 */
36
37#ifndef ENOTSUP
38#define ENOTSUP EINVAL
39#endif
40#ifndef EOVERFLOW
41#define EOVERFLOW EINVAL
42#endif
43
44/* Unlike <ctype.h>'s isdigit, this also works if c < 0 | c > UCHAR_MAX. */
45#define is_digit(c) ((unsigned)(c) - '0' <= 9)
46
47/* PG doesn't currently rely on <inttypes.h>, so work around strtoimax() */
48#undef strtoimax
49#ifdef HAVE_STRTOLL
50#define strtoimax strtoll
51#else
52#define strtoimax strtol
53#endif
54
55
56/*
57 * Finally, some convenience items.
58 */
59
60#define TYPE_BIT(type) (sizeof (type) * CHAR_BIT)
61#define TYPE_SIGNED(type) (((type) -1) < 0)
62#define TWOS_COMPLEMENT(t) ((t) ~ (t) 0 < 0)
63
64/*
65 * Max and min values of the integer type T, of which only the bottom
66 * B bits are used, and where the highest-order used bit is considered
67 * to be a sign bit if T is signed.
68 */
69#define MAXVAL(t, b) \
70 ((t) (((t) 1 << ((b) - 1 - TYPE_SIGNED(t))) \
71 - 1 + ((t) 1 << ((b) - 1 - TYPE_SIGNED(t)))))
72#define MINVAL(t, b) \
73 ((t) (TYPE_SIGNED(t) ? - TWOS_COMPLEMENT(t) - MAXVAL(t, b) : 0))
74
75/* The extreme time values, assuming no padding. */
76#define TIME_T_MIN MINVAL(pg_time_t, TYPE_BIT(pg_time_t))
77#define TIME_T_MAX MAXVAL(pg_time_t, TYPE_BIT(pg_time_t))
78
79/*
80 * 302 / 1000 is log10(2.0) rounded up.
81 * Subtract one for the sign bit if the type is signed;
82 * add one for integer division truncation;
83 * add one more for a minus sign if the type is signed.
84 */
85#define INT_STRLEN_MAXIMUM(type) \
86 ((TYPE_BIT(type) - TYPE_SIGNED(type)) * 302 / 1000 + \
87 1 + TYPE_SIGNED(type))
88
89/*
90 * INITIALIZE(x)
91 */
92#define INITIALIZE(x) ((x) = 0)
93
94#undef _
95#define _(msgid) (msgid)
96
97/* Handy macros that are independent of tzfile implementation. */
98
99#define YEARSPERREPEAT 400 /* years before a Gregorian repeat */
100
101#define SECSPERMIN 60
102#define MINSPERHOUR 60
103#define HOURSPERDAY 24
104#define DAYSPERWEEK 7
105#define DAYSPERNYEAR 365
106#define DAYSPERLYEAR 366
107#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
108#define SECSPERDAY ((int32) SECSPERHOUR * HOURSPERDAY)
109#define MONSPERYEAR 12
110
111#define TM_SUNDAY 0
112#define TM_MONDAY 1
113#define TM_TUESDAY 2
114#define TM_WEDNESDAY 3
115#define TM_THURSDAY 4
116#define TM_FRIDAY 5
117#define TM_SATURDAY 6
118
119#define TM_JANUARY 0
120#define TM_FEBRUARY 1
121#define TM_MARCH 2
122#define TM_APRIL 3
123#define TM_MAY 4
124#define TM_JUNE 5
125#define TM_JULY 6
126#define TM_AUGUST 7
127#define TM_SEPTEMBER 8
128#define TM_OCTOBER 9
129#define TM_NOVEMBER 10
130#define TM_DECEMBER 11
131
132#define TM_YEAR_BASE 1900
133
134#define EPOCH_YEAR 1970
135#define EPOCH_WDAY TM_THURSDAY
136
137#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
138
139/*
140 * Since everything in isleap is modulo 400 (or a factor of 400), we know that
141 * isleap(y) == isleap(y % 400)
142 * and so
143 * isleap(a + b) == isleap((a + b) % 400)
144 * or
145 * isleap(a + b) == isleap(a % 400 + b % 400)
146 * This is true even if % means modulo rather than Fortran remainder
147 * (which is allowed by C89 but not by C99 or later).
148 * We use this to avoid addition overflow problems.
149 */
150
151#define isleap_sum(a, b) isleap((a) % 400 + (b) % 400)
152
153
154/*
155 * The Gregorian year averages 365.2425 days, which is 31556952 seconds.
156 */
157
158#define AVGSECSPERYEAR 31556952L
159#define SECSPERREPEAT \
160 ((int64) YEARSPERREPEAT * (int64) AVGSECSPERYEAR)
161#define SECSPERREPEAT_BITS 34 /* ceil(log2(SECSPERREPEAT)) */
162
163#endif /* !defined PRIVATE_H */
164