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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 12:15:05 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 12:15:05 +0000 |
commit | 46651ce6fe013220ed397add242004d764fc0153 (patch) | |
tree | 6e5299f990f88e60174a1d3ae6e48eedd2688b2b /src/timezone/tzfile.h | |
parent | Initial commit. (diff) | |
download | postgresql-14-46651ce6fe013220ed397add242004d764fc0153.tar.xz postgresql-14-46651ce6fe013220ed397add242004d764fc0153.zip |
Adding upstream version 14.5.upstream/14.5upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/timezone/tzfile.h')
-rw-r--r-- | src/timezone/tzfile.h | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/src/timezone/tzfile.h b/src/timezone/tzfile.h new file mode 100644 index 0000000..8f3eb6b --- /dev/null +++ b/src/timezone/tzfile.h @@ -0,0 +1,110 @@ +/* Layout and location of TZif files. */ + +#ifndef TZFILE_H + +#define TZFILE_H + +/* + * This file is in the public domain, so clarified as of + * 1996-06-05 by Arthur David Olson. + * + * IDENTIFICATION + * src/timezone/tzfile.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! + */ + +/* + * Information about time zone files. + */ + +#define TZDEFAULT "/etc/localtime" +#define TZDEFRULES "posixrules" + + +/* See Internet RFC 8536 for more details about the following format. */ + +/* + * Each file begins with. . . + */ + +#define TZ_MAGIC "TZif" + +struct tzhead +{ + char tzh_magic[4]; /* TZ_MAGIC */ + char tzh_version[1]; /* '\0' or '2' or '3' as of 2013 */ + char tzh_reserved[15]; /* reserved; must be zero */ + char tzh_ttisutcnt[4]; /* coded number of trans. time flags */ + char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */ + char tzh_leapcnt[4]; /* coded number of leap seconds */ + char tzh_timecnt[4]; /* coded number of transition times */ + char tzh_typecnt[4]; /* coded number of local time types */ + char tzh_charcnt[4]; /* coded number of abbr. chars */ +}; + +/* + * . . .followed by. . . + * + * tzh_timecnt (char [4])s coded transition times a la time(2) + * tzh_timecnt (unsigned char)s types of local time starting at above + * tzh_typecnt repetitions of + * one (char [4]) coded UT offset in seconds + * one (unsigned char) used to set tm_isdst + * one (unsigned char) that's an abbreviation list index + * tzh_charcnt (char)s '\0'-terminated zone abbreviations + * tzh_leapcnt repetitions of + * one (char [4]) coded leap second transition times + * one (char [4]) total correction after above + * tzh_ttisstdcnt (char)s indexed by type; if 1, transition + * time is standard time, if 0, + * transition time is local (wall clock) + * time; if absent, transition times are + * assumed to be local time + * tzh_ttisutcnt (char)s indexed by type; if 1, transition + * time is UT, if 0, transition time is + * local time; if absent, transition + * times are assumed to be local time. + * When this is 1, the corresponding + * std/wall indicator must also be 1. + */ + +/* + * If tzh_version is '2' or greater, the above is followed by a second instance + * of tzhead and a second instance of the data in which each coded transition + * time uses 8 rather than 4 chars, + * then a POSIX-TZ-environment-variable-style string for use in handling + * instants after the last transition time stored in the file + * (with nothing between the newlines if there is no POSIX representation for + * such instants). + * + * If tz_version is '3' or greater, the above is extended as follows. + * First, the POSIX TZ string's hour offset may range from -167 + * through 167 as compared to the POSIX-required 0 through 24. + * Second, its DST start time may be January 1 at 00:00 and its stop + * time December 31 at 24:00 plus the difference between DST and + * standard time, indicating DST all year. + */ + +/* + * In the current implementation, "tzset()" refuses to deal with files that + * exceed any of the limits below. + */ + +#define TZ_MAX_TIMES 2000 + +/* This must be at least 17 for Europe/Samara and Europe/Vilnius. */ +#define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */ + +#define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */ + /* (limited by what unsigned chars can hold) */ + +#define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */ + +#endif /* !defined TZFILE_H */ |