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
12/*
13** This header is for use ONLY with the time conversion code.
14** There is no guarantee that it will remain unchanged,
15** or that it will remain at all.
16** Do NOT copy it to any system include directory.
17** Thank you!
18*/
19
20/*
21** zdump has been made independent of the rest of the time
22** conversion package to increase confidence in the verification it provides.
23** You can use zdump to help in verifying other implementations.
24** To do this, compile with -DUSE_LTZ=0 and link without the tz library.
25*/
26#ifndef USE_LTZ
27# define USE_LTZ 1
28#endif
29
30/* This string was in the Factory zone through version 2016f. */
31#define GRANDPARENTED "Local time zone must be set--see zic manual page"
32
33/*
34** Defaults for preprocessor symbols.
35** You can override these in your C compiler options, e.g. '-DHAVE_GETTEXT=1'.
36*/
37
38#ifndef HAVE_DECL_ASCTIME_R
39#define HAVE_DECL_ASCTIME_R 1
40#endif
41
42#if !defined HAVE_GENERIC && defined __has_extension
43# if __has_extension(c_generic_selections)
44# define HAVE_GENERIC 1
45# else
46# define HAVE_GENERIC 0
47# endif
48#endif
49/* _Generic is buggy in pre-4.9 GCC. */
50#if !defined HAVE_GENERIC && defined __GNUC__
51# define HAVE_GENERIC (4 < __GNUC__ + (9 <= __GNUC_MINOR__))
52#endif
53#ifndef HAVE_GENERIC
54# define HAVE_GENERIC (201112 <= __STDC_VERSION__)
55#endif
56
57#ifndef HAVE_GETTEXT
58#define HAVE_GETTEXT 0
59#endif /* !defined HAVE_GETTEXT */
60
61#ifndef HAVE_INCOMPATIBLE_CTIME_R
62#define HAVE_INCOMPATIBLE_CTIME_R 0
63#endif
64
65#ifndef HAVE_LINK
66#define HAVE_LINK 1
67#endif /* !defined HAVE_LINK */
68
69#ifndef HAVE_POSIX_DECLS
70#define HAVE_POSIX_DECLS 1
71#endif
72
73#ifndef HAVE_STDBOOL_H
74#define HAVE_STDBOOL_H (199901 <= __STDC_VERSION__)
75#endif
76
77#ifndef HAVE_STRDUP
78#define HAVE_STRDUP 1
79#endif
80
81#ifndef HAVE_STRTOLL
82#define HAVE_STRTOLL 1
83#endif
84
85#ifndef HAVE_SYMLINK
86#define HAVE_SYMLINK 1
87#endif /* !defined HAVE_SYMLINK */
88
89#ifndef HAVE_SYS_STAT_H
90#define HAVE_SYS_STAT_H 1
91#endif /* !defined HAVE_SYS_STAT_H */
92
93#ifndef HAVE_SYS_WAIT_H
94#define HAVE_SYS_WAIT_H 1
95#endif /* !defined HAVE_SYS_WAIT_H */
96
97#ifndef HAVE_UNISTD_H
98#define HAVE_UNISTD_H 1
99#endif /* !defined HAVE_UNISTD_H */
100
101#ifndef HAVE_UTMPX_H
102#define HAVE_UTMPX_H 1
103#endif /* !defined HAVE_UTMPX_H */
104
105#ifndef NETBSD_INSPIRED
106# define NETBSD_INSPIRED 1
107#endif
108
109#if HAVE_INCOMPATIBLE_CTIME_R
110#define asctime_r _incompatible_asctime_r
111#define ctime_r _incompatible_ctime_r
112#endif /* HAVE_INCOMPATIBLE_CTIME_R */
113
114/* Enable tm_gmtoff, tm_zone, and environ on GNUish systems. */
115#define _GNU_SOURCE 1
116/* Fix asctime_r on Solaris 11. */
117#define _POSIX_PTHREAD_SEMANTICS 1
118/* Enable strtoimax on pre-C99 Solaris 11. */
119#define __EXTENSIONS__ 1
120
121/* To avoid having 'stat' fail unnecessarily with errno == EOVERFLOW,
122 enable large files on GNUish systems ... */
123#ifndef _FILE_OFFSET_BITS
124# define _FILE_OFFSET_BITS 64
125#endif
126/* ... and on AIX ... */
127#define _LARGE_FILES 1
128/* ... and enable large inode numbers on Mac OS X 10.5 and later. */
129#define _DARWIN_USE_64_BIT_INODE 1
130
131/*
132** Nested includes
133*/
134
135/* Avoid clashes with NetBSD by renaming NetBSD's declarations. */
136#define localtime_rz sys_localtime_rz
137#define mktime_z sys_mktime_z
138#define posix2time_z sys_posix2time_z
139#define time2posix_z sys_time2posix_z
140#define timezone_t sys_timezone_t
141#define tzalloc sys_tzalloc
142#define tzfree sys_tzfree
143#include <time.h>
144#undef localtime_rz
145#undef mktime_z
146#undef posix2time_z
147#undef time2posix_z
148#undef timezone_t
149#undef tzalloc
150#undef tzfree
151
152#include <sys/types.h> /* for time_t */
153#include <string.h>
154#include <limits.h> /* for CHAR_BIT et al. */
155#include <stdlib.h>
156
157#include <errno.h>
158
159#ifndef ENAMETOOLONG
160# define ENAMETOOLONG EINVAL
161#endif
162#ifndef ENOTSUP
163# define ENOTSUP EINVAL
164#endif
165#ifndef EOVERFLOW
166# define EOVERFLOW EINVAL
167#endif
168
169#if HAVE_GETTEXT
170#include <libintl.h>
171#endif /* HAVE_GETTEXT */
172
173#if HAVE_UNISTD_H
174#include <unistd.h> /* for R_OK, and other POSIX goodness */
175#endif /* HAVE_UNISTD_H */
176
177#ifndef HAVE_STRFTIME_L
178# if _POSIX_VERSION < 200809
179# define HAVE_STRFTIME_L 0
180# else
181# define HAVE_STRFTIME_L 1
182# endif
183#endif
184
185#ifndef USG_COMPAT
186# ifndef _XOPEN_VERSION
187# define USG_COMPAT 0
188# else
189# define USG_COMPAT 1
190# endif
191#endif
192
193#ifndef HAVE_TZNAME
194# if _POSIX_VERSION < 198808 && !USG_COMPAT
195# define HAVE_TZNAME 0
196# else
197# define HAVE_TZNAME 1
198# endif
199#endif
200
201#ifndef R_OK
202#define R_OK 4
203#endif /* !defined R_OK */
204
205/* Unlike <ctype.h>'s isdigit, this also works if c < 0 | c > UCHAR_MAX. */
206#define is_digit(c) ((unsigned)(c) - '0' <= 9)
207
208/*
209** Define HAVE_STDINT_H's default value here, rather than at the
210** start, since __GLIBC__ and INTMAX_MAX's values depend on
211** previously-included files. glibc 2.1 and Solaris 10 and later have
212** stdint.h, even with pre-C99 compilers.
213*/
214#ifndef HAVE_STDINT_H
215#define HAVE_STDINT_H \
216 (199901 <= __STDC_VERSION__ \
217 || 2 < __GLIBC__ + (1 <= __GLIBC_MINOR__) \
218 || __CYGWIN__ || INTMAX_MAX)
219#endif /* !defined HAVE_STDINT_H */
220
221#if HAVE_STDINT_H
222#include <stdint.h>
223#endif /* !HAVE_STDINT_H */
224
225#ifndef HAVE_INTTYPES_H
226# define HAVE_INTTYPES_H HAVE_STDINT_H
227#endif
228#if HAVE_INTTYPES_H
229# include <inttypes.h>
230#endif
231
232/* Pre-C99 GCC compilers define __LONG_LONG_MAX__ instead of LLONG_MAX. */
233#ifdef __LONG_LONG_MAX__
234# ifndef LLONG_MAX
235# define LLONG_MAX __LONG_LONG_MAX__
236# endif
237# ifndef LLONG_MIN
238# define LLONG_MIN (-1 - LLONG_MAX)
239# endif
240#endif
241
242#ifndef INT_FAST64_MAX
243# ifdef LLONG_MAX
244typedef long long int_fast64_t;
245# define INT_FAST64_MIN LLONG_MIN
246# define INT_FAST64_MAX LLONG_MAX
247# else
248# if LONG_MAX >> 31 < 0xffffffff
249Please use a compiler that supports a 64-bit integer type (or wider);
250you may need to compile with "-DHAVE_STDINT_H".
251# endif
252typedef long int_fast64_t;
253# define INT_FAST64_MIN LONG_MIN
254# define INT_FAST64_MAX LONG_MAX
255# endif
256#endif
257
258#ifndef PRIdFAST64
259# if INT_FAST64_MAX == LLONG_MAX
260# define PRIdFAST64 "lld"
261# else
262# define PRIdFAST64 "ld"
263# endif
264#endif
265
266#ifndef SCNdFAST64
267# define SCNdFAST64 PRIdFAST64
268#endif
269
270#ifndef INT_FAST32_MAX
271# if INT_MAX >> 31 == 0
272typedef long int_fast32_t;
273# define INT_FAST32_MAX LONG_MAX
274# define INT_FAST32_MIN LONG_MIN
275# else
276typedef int int_fast32_t;
277# define INT_FAST32_MAX INT_MAX
278# define INT_FAST32_MIN INT_MIN
279# endif
280#endif
281
282#ifndef INTMAX_MAX
283# ifdef LLONG_MAX
284typedef long long intmax_t;
285# if HAVE_STRTOLL
286# define strtoimax strtoll
287# endif
288# define INTMAX_MAX LLONG_MAX
289# define INTMAX_MIN LLONG_MIN
290# else
291typedef long intmax_t;
292# define INTMAX_MAX LONG_MAX
293# define INTMAX_MIN LONG_MIN
294# endif
295# ifndef strtoimax
296# define strtoimax strtol
297# endif
298#endif
299
300#ifndef PRIdMAX
301# if INTMAX_MAX == LLONG_MAX
302# define PRIdMAX "lld"
303# else
304# define PRIdMAX "ld"
305# endif
306#endif
307
308#ifndef UINT_FAST64_MAX
309# if defined ULLONG_MAX || defined __LONG_LONG_MAX__
310typedef unsigned long long uint_fast64_t;
311# else
312# if ULONG_MAX >> 31 >> 1 < 0xffffffff
313Please use a compiler that supports a 64-bit integer type (or wider);
314you may need to compile with "-DHAVE_STDINT_H".
315# endif
316typedef unsigned long uint_fast64_t;
317# endif
318#endif
319
320#ifndef UINTMAX_MAX
321# if defined ULLONG_MAX || defined __LONG_LONG_MAX__
322typedef unsigned long long uintmax_t;
323# else
324typedef unsigned long uintmax_t;
325# endif
326#endif
327
328#ifndef PRIuMAX
329# if defined ULLONG_MAX || defined __LONG_LONG_MAX__
330# define PRIuMAX "llu"
331# else
332# define PRIuMAX "lu"
333# endif
334#endif
335
336#ifndef INT32_MAX
337#define INT32_MAX 0x7fffffff
338#endif /* !defined INT32_MAX */
339#ifndef INT32_MIN
340#define INT32_MIN (-1 - INT32_MAX)
341#endif /* !defined INT32_MIN */
342
343#ifndef SIZE_MAX
344#define SIZE_MAX ((size_t) -1)
345#endif
346
347#if 3 <= __GNUC__
348# define ATTRIBUTE_CONST __attribute__ ((const))
349# define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
350# define ATTRIBUTE_PURE __attribute__ ((__pure__))
351# define ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec))
352#else
353# define ATTRIBUTE_CONST /* empty */
354# define ATTRIBUTE_MALLOC /* empty */
355# define ATTRIBUTE_PURE /* empty */
356# define ATTRIBUTE_FORMAT(spec) /* empty */
357#endif
358
359#if !defined _Noreturn && __STDC_VERSION__ < 201112
360# if 2 < __GNUC__ + (8 <= __GNUC_MINOR__)
361# define _Noreturn __attribute__ ((__noreturn__))
362# else
363# define _Noreturn
364# endif
365#endif
366
367#if __STDC_VERSION__ < 199901 && !defined restrict
368# define restrict /* empty */
369#endif
370
371/*
372** Workarounds for compilers/systems.
373*/
374
375#ifndef EPOCH_LOCAL
376# define EPOCH_LOCAL 0
377#endif
378#ifndef EPOCH_OFFSET
379# define EPOCH_OFFSET 0
380#endif
381#ifndef RESERVE_STD_EXT_IDS
382# define RESERVE_STD_EXT_IDS 0
383#endif
384
385/* If standard C identifiers with external linkage (e.g., localtime)
386 are reserved and are not already being renamed anyway, rename them
387 as if compiling with '-Dtime_tz=time_t'. */
388#if !defined time_tz && RESERVE_STD_EXT_IDS && USE_LTZ
389# define time_tz time_t
390#endif
391
392/*
393** Compile with -Dtime_tz=T to build the tz package with a private
394** time_t type equivalent to T rather than the system-supplied time_t.
395** This debugging feature can test unusual design decisions
396** (e.g., time_t wider than 'long', or unsigned time_t) even on
397** typical platforms.
398*/
399#if defined time_tz || EPOCH_LOCAL || EPOCH_OFFSET != 0
400# define TZ_TIME_T 1
401#else
402# define TZ_TIME_T 0
403#endif
404
405#if TZ_TIME_T
406# ifdef LOCALTIME_IMPLEMENTATION
407static time_t sys_time(time_t *x) { return time(x); }
408# endif
409
410typedef time_tz tz_time_t;
411
412# undef ctime
413# define ctime tz_ctime
414# undef ctime_r
415# define ctime_r tz_ctime_r
416# undef difftime
417# define difftime tz_difftime
418# undef gmtime
419# define gmtime tz_gmtime
420# undef gmtime_r
421# define gmtime_r tz_gmtime_r
422# undef localtime
423# define localtime tz_localtime
424# undef localtime_r
425# define localtime_r tz_localtime_r
426# undef localtime_rz
427# define localtime_rz tz_localtime_rz
428# undef mktime
429# define mktime tz_mktime
430# undef mktime_z
431# define mktime_z tz_mktime_z
432# undef offtime
433# define offtime tz_offtime
434# undef posix2time
435# define posix2time tz_posix2time
436# undef posix2time_z
437# define posix2time_z tz_posix2time_z
438# undef strftime
439# define strftime tz_strftime
440# undef time
441# define time tz_time
442# undef time2posix
443# define time2posix tz_time2posix
444# undef time2posix_z
445# define time2posix_z tz_time2posix_z
446# undef time_t
447# define time_t tz_time_t
448# undef timegm
449# define timegm tz_timegm
450# undef timelocal
451# define timelocal tz_timelocal
452# undef timeoff
453# define timeoff tz_timeoff
454# undef tzalloc
455# define tzalloc tz_tzalloc
456# undef tzfree
457# define tzfree tz_tzfree
458# undef tzset
459# define tzset tz_tzset
460# undef tzsetwall
461# define tzsetwall tz_tzsetwall
462# if HAVE_STRFTIME_L
463# undef strftime_l
464# define strftime_l tz_strftime_l
465# endif
466# if HAVE_TZNAME
467# undef tzname
468# define tzname tz_tzname
469# endif
470# if USG_COMPAT
471# undef daylight
472# define daylight tz_daylight
473# undef timezone
474# define timezone tz_timezone
475# endif
476# ifdef ALTZONE
477# undef altzone
478# define altzone tz_altzone
479# endif
480
481char *ctime(time_t const *);
482char *ctime_r(time_t const *, char *);
483double difftime(time_t, time_t) ATTRIBUTE_CONST;
484size_t strftime(char *restrict, size_t, char const *restrict,
485 struct tm const *restrict);
486# if HAVE_STRFTIME_L
487size_t strftime_l(char *restrict, size_t, char const *restrict,
488 struct tm const *restrict, locale_t);
489# endif
490struct tm *gmtime(time_t const *);
491struct tm *gmtime_r(time_t const *restrict, struct tm *restrict);
492struct tm *localtime(time_t const *);
493struct tm *localtime_r(time_t const *restrict, struct tm *restrict);
494time_t mktime(struct tm *);
495time_t time(time_t *);
496void tzset(void);
497#endif
498
499#if !HAVE_DECL_ASCTIME_R && !defined asctime_r
500extern char *asctime_r(struct tm const *restrict, char *restrict);
501#endif
502
503#ifndef HAVE_DECL_ENVIRON
504# if defined environ || defined __USE_GNU
505# define HAVE_DECL_ENVIRON 1
506# else
507# define HAVE_DECL_ENVIRON 0
508# endif
509#endif
510
511#if !HAVE_DECL_ENVIRON
512extern char **environ;
513#endif
514
515#if TZ_TIME_T || !HAVE_POSIX_DECLS
516# if HAVE_TZNAME
517extern char *tzname[];
518# endif
519# if USG_COMPAT
520extern long timezone;
521extern int daylight;
522# endif
523#endif
524
525#ifdef ALTZONE
526extern long altzone;
527#endif
528
529/*
530** The STD_INSPIRED functions are similar, but most also need
531** declarations if time_tz is defined.
532*/
533
534#ifdef STD_INSPIRED
535# if TZ_TIME_T || !defined tzsetwall
536void tzsetwall(void);
537# endif
538# if TZ_TIME_T || !defined offtime
539struct tm *offtime(time_t const *, long);
540# endif
541# if TZ_TIME_T || !defined timegm
542time_t timegm(struct tm *);
543# endif
544# if TZ_TIME_T || !defined timelocal
545time_t timelocal(struct tm *);
546# endif
547# if TZ_TIME_T || !defined timeoff
548time_t timeoff(struct tm *, long);
549# endif
550# if TZ_TIME_T || !defined time2posix
551time_t time2posix(time_t);
552# endif
553# if TZ_TIME_T || !defined posix2time
554time_t posix2time(time_t);
555# endif
556#endif
557
558/* Infer TM_ZONE on systems where this information is known, but suppress
559 guessing if NO_TM_ZONE is defined. Similarly for TM_GMTOFF. */
560#if (defined __GLIBC__ \
561 || defined __FreeBSD__ || defined __NetBSD__ || defined __OpenBSD__ \
562 || (defined __APPLE__ && defined __MACH__))
563# if !defined TM_GMTOFF && !defined NO_TM_GMTOFF
564# define TM_GMTOFF tm_gmtoff
565# endif
566# if !defined TM_ZONE && !defined NO_TM_ZONE
567# define TM_ZONE tm_zone
568# endif
569#endif
570
571/*
572** Define functions that are ABI compatible with NetBSD but have
573** better prototypes. NetBSD 6.1.4 defines a pointer type timezone_t
574** and labors under the misconception that 'const timezone_t' is a
575** pointer to a constant. This use of 'const' is ineffective, so it
576** is not done here. What we call 'struct state' NetBSD calls
577** 'struct __state', but this is a private name so it doesn't matter.
578*/
579#if NETBSD_INSPIRED
580typedef struct state *timezone_t;
581struct tm *localtime_rz(timezone_t restrict, time_t const *restrict,
582 struct tm *restrict);
583time_t mktime_z(timezone_t restrict, struct tm *restrict);
584timezone_t tzalloc(char const *);
585void tzfree(timezone_t);
586# ifdef STD_INSPIRED
587# if TZ_TIME_T || !defined posix2time_z
588time_t posix2time_z(timezone_t, time_t) ATTRIBUTE_PURE;
589# endif
590# if TZ_TIME_T || !defined time2posix_z
591time_t time2posix_z(timezone_t, time_t) ATTRIBUTE_PURE;
592# endif
593# endif
594#endif
595
596/*
597** Finally, some convenience items.
598*/
599
600#if HAVE_STDBOOL_H
601# include <stdbool.h>
602#else
603# define true 1
604# define false 0
605# define bool int
606#endif
607
608#define TYPE_BIT(type) (sizeof (type) * CHAR_BIT)
609#define TYPE_SIGNED(type) (((type) -1) < 0)
610#define TWOS_COMPLEMENT(t) ((t) ~ (t) 0 < 0)
611
612/* Max and min values of the integer type T, of which only the bottom
613 B bits are used, and where the highest-order used bit is considered
614 to be a sign bit if T is signed. */
615#define MAXVAL(t, b) \
616 ((t) (((t) 1 << ((b) - 1 - TYPE_SIGNED(t))) \
617 - 1 + ((t) 1 << ((b) - 1 - TYPE_SIGNED(t)))))
618#define MINVAL(t, b) \
619 ((t) (TYPE_SIGNED(t) ? - TWOS_COMPLEMENT(t) - MAXVAL(t, b) : 0))
620
621/* The extreme time values, assuming no padding. */
622#define TIME_T_MIN_NO_PADDING MINVAL(time_t, TYPE_BIT(time_t))
623#define TIME_T_MAX_NO_PADDING MAXVAL(time_t, TYPE_BIT(time_t))
624
625/* The extreme time values. These are macros, not constants, so that
626 any portability problem occur only when compiling .c files that use
627 the macros, which is safer for applications that need only zdump and zic.
628 This implementation assumes no padding if time_t is signed and
629 either the compiler lacks support for _Generic or time_t is not one
630 of the standard signed integer types. */
631#if HAVE_GENERIC
632# define TIME_T_MIN \
633 _Generic((time_t) 0, \
634 signed char: SCHAR_MIN, short: SHRT_MIN, \
635 int: INT_MIN, long: LONG_MIN, long long: LLONG_MIN, \
636 default: TIME_T_MIN_NO_PADDING)
637# define TIME_T_MAX \
638 (TYPE_SIGNED(time_t) \
639 ? _Generic((time_t) 0, \
640 signed char: SCHAR_MAX, short: SHRT_MAX, \
641 int: INT_MAX, long: LONG_MAX, long long: LLONG_MAX, \
642 default: TIME_T_MAX_NO_PADDING) \
643 : (time_t) -1)
644#else
645# define TIME_T_MIN TIME_T_MIN_NO_PADDING
646# define TIME_T_MAX TIME_T_MAX_NO_PADDING
647#endif
648
649/*
650** 302 / 1000 is log10(2.0) rounded up.
651** Subtract one for the sign bit if the type is signed;
652** add one for integer division truncation;
653** add one more for a minus sign if the type is signed.
654*/
655#define INT_STRLEN_MAXIMUM(type) \
656 ((TYPE_BIT(type) - TYPE_SIGNED(type)) * 302 / 1000 + \
657 1 + TYPE_SIGNED(type))
658
659/*
660** INITIALIZE(x)
661*/
662
663#ifdef GCC_LINT
664# define INITIALIZE(x) ((x) = 0)
665#else
666# define INITIALIZE(x)
667#endif
668
669#ifndef UNINIT_TRAP
670# define UNINIT_TRAP 0
671#endif
672
673/*
674** For the benefit of GNU folk...
675** '_(MSGID)' uses the current locale's message library string for MSGID.
676** The default is to use gettext if available, and use MSGID otherwise.
677*/
678
679#if HAVE_GETTEXT
680#define _(msgid) gettext(msgid)
681#else /* !HAVE_GETTEXT */
682#define _(msgid) msgid
683#endif /* !HAVE_GETTEXT */
684
685#if !defined TZ_DOMAIN && defined HAVE_GETTEXT
686# define TZ_DOMAIN "tz"
687#endif
688
689#if HAVE_INCOMPATIBLE_CTIME_R
690#undef asctime_r
691#undef ctime_r
692char *asctime_r(struct tm const *, char *);
693char *ctime_r(time_t const *, char *);
694#endif /* HAVE_INCOMPATIBLE_CTIME_R */
695
696/* Handy macros that are independent of tzfile implementation. */
697
698#define YEARSPERREPEAT 400 /* years before a Gregorian repeat */
699
700#define SECSPERMIN 60
701#define MINSPERHOUR 60
702#define HOURSPERDAY 24
703#define DAYSPERWEEK 7
704#define DAYSPERNYEAR 365
705#define DAYSPERLYEAR 366
706#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
707#define SECSPERDAY ((int_fast32_t) SECSPERHOUR * HOURSPERDAY)
708#define MONSPERYEAR 12
709
710#define TM_SUNDAY 0
711#define TM_MONDAY 1
712#define TM_TUESDAY 2
713#define TM_WEDNESDAY 3
714#define TM_THURSDAY 4
715#define TM_FRIDAY 5
716#define TM_SATURDAY 6
717
718#define TM_JANUARY 0
719#define TM_FEBRUARY 1
720#define TM_MARCH 2
721#define TM_APRIL 3
722#define TM_MAY 4
723#define TM_JUNE 5
724#define TM_JULY 6
725#define TM_AUGUST 7
726#define TM_SEPTEMBER 8
727#define TM_OCTOBER 9
728#define TM_NOVEMBER 10
729#define TM_DECEMBER 11
730
731#define TM_YEAR_BASE 1900
732
733#define EPOCH_YEAR 1970
734#define EPOCH_WDAY TM_THURSDAY
735
736#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
737
738/*
739** Since everything in isleap is modulo 400 (or a factor of 400), we know that
740** isleap(y) == isleap(y % 400)
741** and so
742** isleap(a + b) == isleap((a + b) % 400)
743** or
744** isleap(a + b) == isleap(a % 400 + b % 400)
745** This is true even if % means modulo rather than Fortran remainder
746** (which is allowed by C89 but not by C99 or later).
747** We use this to avoid addition overflow problems.
748*/
749
750#define isleap_sum(a, b) isleap((a) % 400 + (b) % 400)
751
752
753/*
754** The Gregorian year averages 365.2425 days, which is 31556952 seconds.
755*/
756
757#define AVGSECSPERYEAR 31556952L
758#define SECSPERREPEAT \
759 ((int_fast64_t) YEARSPERREPEAT * (int_fast64_t) AVGSECSPERYEAR)
760#define SECSPERREPEAT_BITS 34 /* ceil(log2(SECSPERREPEAT)) */
761
762#endif /* !defined PRIVATE_H */
763