Abseil Common Libraries (C++) (grcp 依赖)
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119 lines
3.8 KiB
119 lines
3.8 KiB
/* Layout and location of TZif files. */ |
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#ifndef TZFILE_H |
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#define TZFILE_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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/* |
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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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/* |
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** Information about time zone files. |
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*/ |
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#ifndef TZDIR |
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#define TZDIR "/usr/share/zoneinfo" /* Time zone object file directory */ |
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#endif /* !defined TZDIR */ |
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#ifndef TZDEFAULT |
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#define TZDEFAULT "/etc/localtime" |
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#endif /* !defined TZDEFAULT */ |
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#ifndef TZDEFRULES |
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#define TZDEFRULES "posixrules" |
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#endif /* !defined TZDEFRULES */ |
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/* |
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** Each file begins with. . . |
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*/ |
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#define TZ_MAGIC "TZif" |
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struct tzhead { |
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char tzh_magic[4]; /* TZ_MAGIC */ |
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char tzh_version[1]; /* '\0' or '2' or '3' as of 2013 */ |
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char tzh_reserved[15]; /* reserved; must be zero */ |
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char tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */ |
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char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */ |
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char tzh_leapcnt[4]; /* coded number of leap seconds */ |
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char tzh_timecnt[4]; /* coded number of transition times */ |
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char tzh_typecnt[4]; /* coded number of local time types */ |
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char tzh_charcnt[4]; /* coded number of abbr. chars */ |
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}; |
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/* |
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** . . .followed by. . . |
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** |
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** tzh_timecnt (char [4])s coded transition times a la time(2) |
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** tzh_timecnt (unsigned char)s types of local time starting at above |
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** tzh_typecnt repetitions of |
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** one (char [4]) coded UT offset in seconds |
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** one (unsigned char) used to set tm_isdst |
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** one (unsigned char) that's an abbreviation list index |
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** tzh_charcnt (char)s '\0'-terminated zone abbreviations |
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** tzh_leapcnt repetitions of |
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** one (char [4]) coded leap second transition times |
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** one (char [4]) total correction after above |
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** tzh_ttisstdcnt (char)s indexed by type; if 1, transition |
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** time is standard time, if 0, |
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** transition time is wall clock time |
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** if absent, transition times are |
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** assumed to be wall clock time |
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** tzh_ttisgmtcnt (char)s indexed by type; if 1, transition |
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** time is UT, if 0, |
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** transition time is local time |
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** if absent, transition times are |
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** assumed to be local time |
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*/ |
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/* |
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** If tzh_version is '2' or greater, the above is followed by a second instance |
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** of tzhead and a second instance of the data in which each coded transition |
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** time uses 8 rather than 4 chars, |
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** then a POSIX-TZ-environment-variable-style std::string for use in handling |
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** instants after the last transition time stored in the file |
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** (with nothing between the newlines if there is no POSIX representation for |
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** such instants). |
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** |
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** If tz_version is '3' or greater, the above is extended as follows. |
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** First, the POSIX TZ std::string's hour offset may range from -167 |
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** through 167 as compared to the POSIX-required 0 through 24. |
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** Second, its DST start time may be January 1 at 00:00 and its stop |
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** time December 31 at 24:00 plus the difference between DST and |
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** standard time, indicating DST all year. |
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*/ |
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/* |
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** In the current implementation, "tzset()" refuses to deal with files that |
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** exceed any of the limits below. |
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*/ |
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#ifndef TZ_MAX_TIMES |
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#define TZ_MAX_TIMES 2000 |
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#endif /* !defined TZ_MAX_TIMES */ |
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#ifndef TZ_MAX_TYPES |
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/* This must be at least 17 for Europe/Samara and Europe/Vilnius. */ |
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#define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */ |
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#endif /* !defined TZ_MAX_TYPES */ |
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#ifndef TZ_MAX_CHARS |
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#define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */ |
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/* (limited by what unsigned chars can hold) */ |
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#endif /* !defined TZ_MAX_CHARS */ |
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#ifndef TZ_MAX_LEAPS |
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#define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */ |
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#endif /* !defined TZ_MAX_LEAPS */ |
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#endif /* !defined TZFILE_H */
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