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 */