PostgreSQL Source Code: src/timezone/private.h Source File

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private.h
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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年06月05日 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 #define strtoimax strtoll
50
51
52/*
53 * Finally, some convenience items.
54 */
55
56 #define TYPE_BIT(type) (sizeof (type) * CHAR_BIT)
57 #define TYPE_SIGNED(type) (((type) -1) < 0)
58 #define TWOS_COMPLEMENT(t) ((t) ~ (t) 0 < 0)
59
60/*
61 * Max and min values of the integer type T, of which only the bottom
62 * B bits are used, and where the highest-order used bit is considered
63 * to be a sign bit if T is signed.
64 */
65 #define MAXVAL(t, b) \
66 ((t) (((t) 1 << ((b) - 1 - TYPE_SIGNED(t))) \
67 - 1 + ((t) 1 << ((b) - 1 - TYPE_SIGNED(t)))))
68 #define MINVAL(t, b) \
69 ((t) (TYPE_SIGNED(t) ? - TWOS_COMPLEMENT(t) - MAXVAL(t, b) : 0))
70
71/* The extreme time values, assuming no padding. */
72 #define TIME_T_MIN MINVAL(pg_time_t, TYPE_BIT(pg_time_t))
73 #define TIME_T_MAX MAXVAL(pg_time_t, TYPE_BIT(pg_time_t))
74
75/*
76 * 302 / 1000 is log10(2.0) rounded up.
77 * Subtract one for the sign bit if the type is signed;
78 * add one for integer division truncation;
79 * add one more for a minus sign if the type is signed.
80 */
81 #define INT_STRLEN_MAXIMUM(type) \
82 ((TYPE_BIT(type) - TYPE_SIGNED(type)) * 302 / 1000 + \
83 1 + TYPE_SIGNED(type))
84
85/*
86 * INITIALIZE(x)
87 */
88 #define INITIALIZE(x) ((x) = 0)
89
90#undef _
91 #define _(msgid) (msgid)
92
93/* Handy macros that are independent of tzfile implementation. */
94
95 #define YEARSPERREPEAT 400 /* years before a Gregorian repeat */
96
97 #define SECSPERMIN 60
98 #define MINSPERHOUR 60
99 #define HOURSPERDAY 24
100 #define DAYSPERWEEK 7
101 #define DAYSPERNYEAR 365
102 #define DAYSPERLYEAR 366
103 #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
104 #define SECSPERDAY ((int32) SECSPERHOUR * HOURSPERDAY)
105 #define MONSPERYEAR 12
106
107 #define TM_SUNDAY 0
108 #define TM_MONDAY 1
109 #define TM_TUESDAY 2
110 #define TM_WEDNESDAY 3
111 #define TM_THURSDAY 4
112 #define TM_FRIDAY 5
113 #define TM_SATURDAY 6
114
115 #define TM_JANUARY 0
116 #define TM_FEBRUARY 1
117 #define TM_MARCH 2
118 #define TM_APRIL 3
119 #define TM_MAY 4
120 #define TM_JUNE 5
121 #define TM_JULY 6
122 #define TM_AUGUST 7
123 #define TM_SEPTEMBER 8
124 #define TM_OCTOBER 9
125 #define TM_NOVEMBER 10
126 #define TM_DECEMBER 11
127
128 #define TM_YEAR_BASE 1900
129
130 #define EPOCH_YEAR 1970
131 #define EPOCH_WDAY TM_THURSDAY
132
133 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
134
135/*
136 * Since everything in isleap is modulo 400 (or a factor of 400), we know that
137 * isleap(y) == isleap(y % 400)
138 * and so
139 * isleap(a + b) == isleap((a + b) % 400)
140 * or
141 * isleap(a + b) == isleap(a % 400 + b % 400)
142 * This is true even if % means modulo rather than Fortran remainder
143 * (which is allowed by C89 but not by C99 or later).
144 * We use this to avoid addition overflow problems.
145 */
146
147 #define isleap_sum(a, b) isleap((a) % 400 + (b) % 400)
148
149
150/*
151 * The Gregorian year averages 365.2425 days, which is 31556952 seconds.
152 */
153
154 #define AVGSECSPERYEAR 31556952L
155 #define SECSPERREPEAT \
156 ((int64) YEARSPERREPEAT * (int64) AVGSECSPERYEAR)
157 #define SECSPERREPEAT_BITS 34 /* ceil(log2(SECSPERREPEAT)) */
158
159#endif /* !defined PRIVATE_H */

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