diff --git a/src/lib/tzcode/CMakeLists.txt b/src/lib/tzcode/CMakeLists.txt
index 3d4662856b384ef24823368b077f4aff9f9e4ee2..0157f9c2672f75fd0d952385969f3b1b47307028 100644
--- a/src/lib/tzcode/CMakeLists.txt
+++ b/src/lib/tzcode/CMakeLists.txt
@@ -1,2 +1,32 @@
-add_library(tzcode STATIC strftime.c strptime.c timelocal.c timezone.c)
+add_library(tzcode STATIC
+ strftime.c strptime.c timelocal.c localtime.c timezone.c)
target_link_libraries(tzcode)
+
+set(TZCODE_PROJECT tzcode-iana)
+set(TZCODE_BUILD_DIR ${CMAKE_CURRENT_BINARY_DIR})
+set(TZCODE_PREFIX ${TZCODE_BUILD_DIR}/tz)
+set(TZDATA_TARGET main.zi)
+
+set(TZDATA_FULL_TARGET
+ ${TZCODE_PREFIX}/src/${TZCODE_PROJECT}/${TZDATA_TARGET})
+
+ExternalProject_Add(${TZCODE_PROJECT}
+ GIT_REPOSITORY https://github.com/tarantool/tz
+ GIT_TAG 2022a
+ GIT_SHALLOW YES
+
+ INSTALL_DIR ${TZCODE_BUILD_DIR}/install
+
+ UPDATE_COMMAND ""
+ CONFIGURE_COMMAND ""
+
+ BUILD_COMMAND ${CMAKE_COMMAND} -E env
+ CC=${CMAKE_C_COMPILER}
+ CFLAGS=${CMAKE_C_FLAGS}
+ PACKRATDATA=backzone
+ make -C <SOURCE_DIR> ${TZDATA_TARGET}
+ BUILD_IN_SOURCE TRUE
+ TEST_COMMAND ""
+ INSTALL_COMMAND make DESTDIR=<INSTALL_DIR> install
+ BUILD_BYPRODUCTS ${TZDATA_FULL_TARGET}
+)
diff --git a/src/lib/tzcode/localtime.c b/src/lib/tzcode/localtime.c
new file mode 100644
index 0000000000000000000000000000000000000000..d2482a19497cb02654807f1d562ae41da5e1ab9e
--- /dev/null
+++ b/src/lib/tzcode/localtime.c
@@ -0,0 +1,1824 @@
+/* Convert timestamp from time_t to struct tm. */
+
+/*
+** This file is in the public domain, so clarified as of
+** 1996-06-05 by Arthur David Olson.
+*/
+
+/*
+** Leap second handling from Bradley White.
+** POSIX-style TZ environment variable handling from Guy Harris.
+*/
+
+/*LINTLIBRARY*/
+
+#include <unistd.h>
+#define LOCALTIME_IMPLEMENTATION
+#include "private.h"
+
+#include "tzfile.h"
+#include <fcntl.h>
+
+#ifndef TZ_ABBR_MAX_LEN
+#define TZ_ABBR_MAX_LEN 16
+#endif /* !defined TZ_ABBR_MAX_LEN */
+
+#ifndef TZ_ABBR_CHAR_SET
+#define TZ_ABBR_CHAR_SET \
+ "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 :+-._"
+#endif /* !defined TZ_ABBR_CHAR_SET */
+
+#ifndef TZ_ABBR_ERR_CHAR
+#define TZ_ABBR_ERR_CHAR '_'
+#endif /* !defined TZ_ABBR_ERR_CHAR */
+
+/*
+** SunOS 4.1.1 headers lack O_BINARY.
+*/
+
+#ifdef O_BINARY
+#define OPEN_MODE (O_RDONLY | O_BINARY)
+#endif /* defined O_BINARY */
+#ifndef O_BINARY
+#define OPEN_MODE O_RDONLY
+#endif /* !defined O_BINARY */
+
+#ifndef WILDABBR
+/*
+** Someone might make incorrect use of a time zone abbreviation:
+** 1. They might reference tzname[0] before calling tzset (explicitly
+** or implicitly).
+** 2. They might reference tzname[1] before calling tzset (explicitly
+** or implicitly).
+** 3. They might reference tzname[1] after setting to a time zone
+** in which Daylight Saving Time is never observed.
+** 4. They might reference tzname[0] after setting to a time zone
+** in which Standard Time is never observed.
+** 5. They might reference tm.TM_ZONE after calling offtime.
+** What's best to do in the above cases is open to debate;
+** for now, we just set things up so that in any of the five cases
+** WILDABBR is used. Another possibility: initialize tzname[0] to the
+** string "tzname[0] used before set", and similarly for the other cases.
+** And another: initialize tzname[0] to "ERA", with an explanation in the
+** manual page of what this "time zone abbreviation" means (doing this so
+** that tzname[0] has the "normal" length of three characters).
+*/
+#define WILDABBR " "
+#endif /* !defined WILDABBR */
+
+static const char wildabbr[] = WILDABBR;
+
+static const char gmt[] = "GMT";
+
+/*
+** The DST rules to use if TZ has no rules and we can't load TZDEFRULES.
+** Default to US rules as of 2017-05-07.
+** POSIX does not specify the default DST rules;
+** for historical reasons, US rules are a common default.
+*/
+#ifndef TZDEFRULESTRING
+#define TZDEFRULESTRING ",M3.2.0,M11.1.0"
+#endif
+
+struct ttinfo { /* time type information */
+ int_fast32_t tt_utoff; /* UT offset in seconds */
+ bool tt_isdst; /* used to set tm_isdst */
+ int tt_desigidx; /* abbreviation list index */
+ bool tt_ttisstd; /* transition is std time */
+ bool tt_ttisut; /* transition is UT */
+};
+
+struct lsinfo { /* leap second information */
+ time_t ls_trans; /* transition time */
+ int_fast32_t ls_corr; /* correction to apply */
+};
+
+#define SMALLEST(a, b) (((a) < (b)) ? (a) : (b))
+#define BIGGEST(a, b) (((a) > (b)) ? (a) : (b))
+
+/* This abbreviation means local time is unspecified. */
+static char const UNSPEC[] = "-00";
+
+/* How many extra bytes are needed at the end of struct state's chars array.
+ This needs to be at least 1 for null termination in case the input
+ data isn't properly terminated, and it also needs to be big enough
+ for ttunspecified to work without crashing. */
+enum { CHARS_EXTRA = BIGGEST(sizeof UNSPEC, 2) - 1 };
+
+#ifdef TZNAME_MAX
+#define MY_TZNAME_MAX TZNAME_MAX
+#endif /* defined TZNAME_MAX */
+#ifndef TZNAME_MAX
+#define MY_TZNAME_MAX 255
+#endif /* !defined TZNAME_MAX */
+
+struct state {
+ int leapcnt;
+ int timecnt;
+ int typecnt;
+ int charcnt;
+ bool goback;
+ bool goahead;
+ time_t ats[TZ_MAX_TIMES];
+ unsigned char types[TZ_MAX_TIMES];
+ struct ttinfo ttis[TZ_MAX_TYPES];
+ char chars[BIGGEST(BIGGEST(TZ_MAX_CHARS + CHARS_EXTRA, sizeof gmt),
+ (2 * (MY_TZNAME_MAX + 1)))];
+ struct lsinfo lsis[TZ_MAX_LEAPS];
+
+ /* The time type to use for early times or if no transitions.
+ It is always zero for recent tzdb releases.
+ It might be nonzero for data from tzdb 2018e or earlier. */
+ int defaulttype;
+};
+
+enum r_type {
+ JULIAN_DAY, /* Jn = Julian day */
+ DAY_OF_YEAR, /* n = day of year */
+ MONTH_NTH_DAY_OF_WEEK /* Mm.n.d = month, week, day of week */
+};
+
+struct rule {
+ enum r_type r_type; /* type of rule */
+ int r_day; /* day number of rule */
+ int r_week; /* week number of rule */
+ int r_mon; /* month number of rule */
+ int_fast32_t r_time; /* transition time of rule */
+};
+
+static struct tm *
+gmtsub(struct state const *, time_t const *, int_fast32_t, struct tm *);
+static bool
+increment_overflow(int *, int);
+static bool
+increment_overflow_time(time_t *, int_fast32_t);
+static int_fast32_t
+leapcorr(struct state const *, time_t);
+static struct tm *
+timesub(time_t const *, int_fast32_t, struct state const *, struct tm *);
+static bool
+typesequiv(struct state const *, int, int);
+static bool
+tzparse(char const *, struct state *, struct state *);
+
+#ifdef ALL_STATE
+static struct state *lclptr;
+static struct state *gmtptr;
+#endif /* defined ALL_STATE */
+
+#ifndef ALL_STATE
+static struct state gmtmem;
+#define gmtptr (&gmtmem)
+#endif /* State Farm */
+
+#if 2 <= HAVE_TZNAME + TZ_TIME_T
+char *tzname[2] = { (char *)wildabbr, (char *)wildabbr };
+#endif
+#if 2 <= USG_COMPAT + TZ_TIME_T
+long timezone;
+int daylight;
+#endif
+#if 2 <= ALTZONE + TZ_TIME_T
+long altzone;
+#endif
+
+/* Initialize *S to a value based on UTOFF, ISDST, and DESIGIDX. */
+static void
+init_ttinfo(struct ttinfo *s, int_fast32_t utoff, bool isdst, int desigidx)
+{
+ s->tt_utoff = utoff;
+ s->tt_isdst = isdst;
+ s->tt_desigidx = desigidx;
+ s->tt_ttisstd = false;
+ s->tt_ttisut = false;
+}
+
+/* Return true if SP's time type I does not specify local time. */
+static bool
+ttunspecified(struct state const *sp, int i)
+{
+ char const *abbr = &sp->chars[sp->ttis[i].tt_desigidx];
+ /* memcmp is likely faster than strcmp, and is safe due to CHARS_EXTRA.
+ */
+ return memcmp(abbr, UNSPEC, sizeof UNSPEC) == 0;
+}
+
+static int_fast32_t
+detzcode(const char *const codep)
+{
+ int_fast32_t result;
+ int i;
+ int_fast32_t one = 1;
+ int_fast32_t halfmaxval = one << (32 - 2);
+ int_fast32_t maxval = halfmaxval - 1 + halfmaxval;
+ int_fast32_t minval = -1 - maxval;
+
+ result = codep[0] & 0x7f;
+ for (i = 1; i < 4; ++i)
+ result = (result << 8) | (codep[i] & 0xff);
+
+ if (codep[0] & 0x80) {
+ /* Do two's-complement negation even on non-two's-complement
+ machines. If the result would be minval - 1, return minval.
+ */
+ result -= !TWOS_COMPLEMENT(int_fast32_t) && result != 0;
+ result += minval;
+ }
+ return result;
+}
+
+static int_fast64_t
+detzcode64(const char *const codep)
+{
+ int_fast64_t result;
+ int i;
+ int_fast64_t one = 1;
+ int_fast64_t halfmaxval = one << (64 - 2);
+ int_fast64_t maxval = halfmaxval - 1 + halfmaxval;
+ int_fast64_t minval = -TWOS_COMPLEMENT(int_fast64_t) - maxval;
+
+ result = codep[0] & 0x7f;
+ for (i = 1; i < 8; ++i)
+ result = (result << 8) | (codep[i] & 0xff);
+
+ if (codep[0] & 0x80) {
+ /* Do two's-complement negation even on non-two's-complement
+ machines. If the result would be minval - 1, return minval.
+ */
+ result -= !TWOS_COMPLEMENT(int_fast64_t) && result != 0;
+ result += minval;
+ }
+ return result;
+}
+
+static void
+update_tzname_etc(struct state const *sp, struct ttinfo const *ttisp)
+{
+#if HAVE_TZNAME
+ tzname[ttisp->tt_isdst] = (char *)&sp->chars[ttisp->tt_desigidx];
+#endif
+#if USG_COMPAT
+ if (!ttisp->tt_isdst)
+ timezone = -ttisp->tt_utoff;
+#endif
+#if ALTZONE
+ if (ttisp->tt_isdst)
+ altzone = -ttisp->tt_utoff;
+#endif
+ (void)sp;
+ (void)ttisp;
+}
+
+static void
+scrub_abbrs(struct state *sp)
+{
+ int i;
+ /*
+ ** First, replace bogus characters.
+ */
+ for (i = 0; i < sp->charcnt; ++i)
+ if (strchr(TZ_ABBR_CHAR_SET, sp->chars[i]) == NULL)
+ sp->chars[i] = TZ_ABBR_ERR_CHAR;
+ /*
+ ** Second, truncate long abbreviations.
+ */
+ for (i = 0; i < sp->typecnt; ++i) {
+ const struct ttinfo *const ttisp = &sp->ttis[i];
+ char *cp = &sp->chars[ttisp->tt_desigidx];
+
+ if (strlen(cp) > TZ_ABBR_MAX_LEN &&
+ strcmp(cp, GRANDPARENTED) != 0)
+ *(cp + TZ_ABBR_MAX_LEN) = '\0';
+ }
+}
+
+/* Input buffer for data read from a compiled tz file. */
+union input_buffer {
+ /* The first part of the buffer, interpreted as a header. */
+ struct tzhead tzhead;
+
+ /* The entire buffer. */
+ char buf[2 * sizeof(struct tzhead) + 2 * sizeof(struct state) +
+ 4 * TZ_MAX_TIMES];
+};
+
+/* TZDIR with a trailing '/' rather than a trailing '\0'. */
+static char const tzdirslash[sizeof TZDIR] = TZDIR "/";
+
+/* Local storage needed for 'tzloadbody'. */
+union local_storage {
+ /* The results of analyzing the file's contents after it is opened. */
+ struct file_analysis {
+ /* The input buffer. */
+ union input_buffer u;
+
+ /* A temporary state used for parsing a TZ string in the file.
+ */
+ struct state st;
+ } u;
+
+ /* The file name to be opened. */
+ char fullname[BIGGEST(sizeof(struct file_analysis),
+ sizeof tzdirslash + 1024)];
+};
+
+/* Load tz data from the file named NAME into *SP. Read extended
+ format if DOEXTEND. Use *LSP for temporary storage. Return 0 on
+ success, an errno value on failure. */
+static int
+tzloadbody(char const *name, struct state *sp, bool doextend,
+ union local_storage *lsp)
+{
+ int i;
+ int fid;
+ int stored;
+ ssize_t nread;
+ bool doaccess;
+ union input_buffer *up = &lsp->u.u;
+ int tzheadsize = sizeof(struct tzhead);
+
+ sp->goback = sp->goahead = false;
+
+ if (!name) {
+ name = TZDEFAULT;
+ if (!name)
+ return EINVAL;
+ }
+
+ if (name[0] == ':')
+ ++name;
+#ifdef SUPPRESS_TZDIR
+ /* Do not prepend TZDIR. This is intended for specialized
+ applications only, due to its security implications. */
+ doaccess = true;
+#else
+ doaccess = name[0] == '/';
+#endif
+ if (!doaccess) {
+ char const *dot;
+ size_t namelen = strlen(name);
+ if (sizeof lsp->fullname - sizeof tzdirslash <= namelen)
+ return ENAMETOOLONG;
+
+ /* Create a string "TZDIR/NAME". Using sprintf here
+ would pull in stdio (and would fail if the
+ resulting string length exceeded INT_MAX!). */
+ memcpy(lsp->fullname, tzdirslash, sizeof tzdirslash);
+ strcpy(lsp->fullname + sizeof tzdirslash, name);
+
+ /* Set doaccess if NAME contains a ".." file name
+ component, as such a name could read a file outside
+ the TZDIR virtual subtree. */
+ for (dot = name; (dot = strchr(dot, '.')); dot++)
+ if ((dot == name || dot[-1] == '/') && dot[1] == '.' &&
+ (dot[2] == '/' || !dot[2])) {
+ doaccess = true;
+ break;
+ }
+
+ name = lsp->fullname;
+ }
+ if (doaccess && access(name, R_OK) != 0)
+ return errno;
+ fid = open(name, OPEN_MODE);
+ if (fid < 0)
+ return errno;
+
+ nread = read(fid, up->buf, sizeof up->buf);
+ if (nread < tzheadsize) {
+ int err = nread < 0 ? errno : EINVAL;
+ close(fid);
+ return err;
+ }
+ if (close(fid) < 0)
+ return errno;
+ for (stored = 4; stored <= 8; stored *= 2) {
+ char version = up->tzhead.tzh_version[0];
+ bool skip_datablock = stored == 4 && version;
+ int_fast32_t datablock_size;
+ int_fast32_t ttisstdcnt = detzcode(up->tzhead.tzh_ttisstdcnt);
+ int_fast32_t ttisutcnt = detzcode(up->tzhead.tzh_ttisutcnt);
+ int_fast64_t prevtr = -1;
+ int_fast32_t prevcorr = 0;
+ int_fast32_t leapcnt = detzcode(up->tzhead.tzh_leapcnt);
+ int_fast32_t timecnt = detzcode(up->tzhead.tzh_timecnt);
+ int_fast32_t typecnt = detzcode(up->tzhead.tzh_typecnt);
+ int_fast32_t charcnt = detzcode(up->tzhead.tzh_charcnt);
+ char const *p = up->buf + tzheadsize;
+ /* Although tzfile(5) currently requires typecnt to be nonzero,
+ support future formats that may allow zero typecnt
+ in files that have a TZ string and no transitions. */
+ if (!(0 <= leapcnt && leapcnt < TZ_MAX_LEAPS && 0 <= typecnt &&
+ typecnt < TZ_MAX_TYPES && 0 <= timecnt &&
+ timecnt < TZ_MAX_TIMES && 0 <= charcnt &&
+ charcnt < TZ_MAX_CHARS && 0 <= ttisstdcnt &&
+ ttisstdcnt < TZ_MAX_TYPES && 0 <= ttisutcnt &&
+ ttisutcnt < TZ_MAX_TYPES))
+ return EINVAL;
+ datablock_size = (timecnt * stored /* ats */
+ + timecnt /* types */
+ + typecnt * 6 /* ttinfos */
+ + charcnt /* chars */
+ + leapcnt * (stored + 4) /* lsinfos */
+ + ttisstdcnt /* ttisstds */
+ + ttisutcnt); /* ttisuts */
+ if (nread < tzheadsize + datablock_size)
+ return EINVAL;
+ if (skip_datablock)
+ p += datablock_size;
+ else {
+ if (!((ttisstdcnt == typecnt || ttisstdcnt == 0) &&
+ (ttisutcnt == typecnt || ttisutcnt == 0)))
+ return EINVAL;
+
+ sp->leapcnt = leapcnt;
+ sp->timecnt = timecnt;
+ sp->typecnt = typecnt;
+ sp->charcnt = charcnt;
+
+ /* Read transitions, discarding those out of time_t
+ range. But pretend the last transition before
+ TIME_T_MIN occurred at TIME_T_MIN. */
+ timecnt = 0;
+ for (i = 0; i < sp->timecnt; ++i) {
+ int_fast64_t at = stored == 4 ? detzcode(p)
+ : detzcode64(p);
+ sp->types[i] = at <= TIME_T_MAX;
+ if (sp->types[i]) {
+ time_t attime =
+ ((TYPE_SIGNED(time_t)
+ ? at < TIME_T_MIN
+ : at < 0)
+ ? TIME_T_MIN
+ : at);
+ if (timecnt &&
+ attime <= sp->ats[timecnt - 1]) {
+ if (attime <
+ sp->ats[timecnt - 1])
+ return EINVAL;
+ sp->types[i - 1] = 0;
+ timecnt--;
+ }
+ sp->ats[timecnt++] = attime;
+ }
+ p += stored;
+ }
+
+ timecnt = 0;
+ for (i = 0; i < sp->timecnt; ++i) {
+ unsigned char typ = *p++;
+ if (sp->typecnt <= typ)
+ return EINVAL;
+ if (sp->types[i])
+ sp->types[timecnt++] = typ;
+ }
+ sp->timecnt = timecnt;
+ for (i = 0; i < sp->typecnt; ++i) {
+ struct ttinfo *ttisp;
+ unsigned char isdst, desigidx;
+
+ ttisp = &sp->ttis[i];
+ ttisp->tt_utoff = detzcode(p);
+ p += 4;
+ isdst = *p++;
+ if (!(isdst < 2))
+ return EINVAL;
+ ttisp->tt_isdst = isdst;
+ desigidx = *p++;
+ if (!(desigidx < sp->charcnt))
+ return EINVAL;
+ ttisp->tt_desigidx = desigidx;
+ }
+ for (i = 0; i < sp->charcnt; ++i)
+ sp->chars[i] = *p++;
+ /* Ensure '\0'-terminated, and make it safe to call
+ ttunspecified later. */
+ memset(&sp->chars[i], 0, CHARS_EXTRA);
+
+ /* Read leap seconds, discarding those out of time_t
+ * range. */
+ leapcnt = 0;
+ for (i = 0; i < sp->leapcnt; ++i) {
+ int_fast64_t tr = stored == 4 ? detzcode(p)
+ : detzcode64(p);
+ int_fast32_t corr = detzcode(p + stored);
+ p += stored + 4;
+
+ /* Leap seconds cannot occur before the Epoch,
+ or out of order. */
+ if (tr <= prevtr)
+ return EINVAL;
+
+ /* To avoid other botches in this code, each
+ leap second's correction must differ from the
+ previous one's by 1 second or less, except
+ that the first correction can be any value;
+ these requirements are more generous than RFC
+ 8536, to allow future RFC extensions. */
+ if (!(i == 0 ||
+ (prevcorr < corr
+ ? corr == prevcorr + 1
+ : (corr == prevcorr ||
+ corr == prevcorr - 1))))
+ return EINVAL;
+ prevtr = tr;
+ prevcorr = corr;
+
+ if (tr <= TIME_T_MAX) {
+ sp->lsis[leapcnt].ls_trans = tr;
+ sp->lsis[leapcnt].ls_corr = corr;
+ leapcnt++;
+ }
+ }
+ sp->leapcnt = leapcnt;
+
+ for (i = 0; i < sp->typecnt; ++i) {
+ struct ttinfo *ttisp;
+
+ ttisp = &sp->ttis[i];
+ if (ttisstdcnt == 0)
+ ttisp->tt_ttisstd = false;
+ else {
+ if (*p != true && *p != false)
+ return EINVAL;
+ ttisp->tt_ttisstd = *p++;
+ }
+ }
+ for (i = 0; i < sp->typecnt; ++i) {
+ struct ttinfo *ttisp;
+
+ ttisp = &sp->ttis[i];
+ if (ttisutcnt == 0)
+ ttisp->tt_ttisut = false;
+ else {
+ if (*p != true && *p != false)
+ return EINVAL;
+ ttisp->tt_ttisut = *p++;
+ }
+ }
+ }
+
+ nread -= p - up->buf;
+ memmove(up->buf, p, nread);
+
+ /* If this is an old file, we're done. */
+ if (!version)
+ break;
+ }
+ if (doextend && nread > 2 && up->buf[0] == '\n' &&
+ up->buf[nread - 1] == '\n' && sp->typecnt + 2 <= TZ_MAX_TYPES) {
+ struct state *ts = &lsp->u.st;
+
+ up->buf[nread - 1] = '\0';
+ if (tzparse(&up->buf[1], ts, sp)) {
+
+ /* Attempt to reuse existing abbreviations.
+ Without this, America/Anchorage would be right on
+ the edge after 2037 when TZ_MAX_CHARS is 50, as
+ sp->charcnt equals 40 (for LMT AST AWT APT AHST
+ AHDT YST AKDT AKST) and ts->charcnt equals 10
+ (for AKST AKDT). Reusing means sp->charcnt can
+ stay 40 in this example. */
+ int gotabbr = 0;
+ int charcnt = sp->charcnt;
+ for (i = 0; i < ts->typecnt; i++) {
+ char *tsabbr =
+ ts->chars + ts->ttis[i].tt_desigidx;
+ int j;
+ for (j = 0; j < charcnt; j++)
+ if (strcmp(sp->chars + j, tsabbr) ==
+ 0) {
+ ts->ttis[i].tt_desigidx = j;
+ gotabbr++;
+ break;
+ }
+ if (!(j < charcnt)) {
+ int tsabbrlen = strlen(tsabbr);
+ if (j + tsabbrlen < TZ_MAX_CHARS) {
+ strcpy(sp->chars + j, tsabbr);
+ charcnt = j + tsabbrlen + 1;
+ ts->ttis[i].tt_desigidx = j;
+ gotabbr++;
+ }
+ }
+ }
+ if (gotabbr == ts->typecnt) {
+ sp->charcnt = charcnt;
+
+ /* Ignore any trailing, no-op transitions
+ generated by zic as they don't help here and
+ can run afoul of bugs in zic 2016j or
+ earlier. */
+ while (1 < sp->timecnt &&
+ (sp->types[sp->timecnt - 1] ==
+ sp->types[sp->timecnt - 2]))
+ sp->timecnt--;
+
+ for (i = 0; i < ts->timecnt &&
+ sp->timecnt < TZ_MAX_TIMES;
+ i++) {
+ time_t t = ts->ats[i];
+ if (increment_overflow_time(
+ &t, leapcorr(sp, t)) ||
+ (0 < sp->timecnt &&
+ t <= sp->ats[sp->timecnt - 1]))
+ continue;
+ sp->ats[sp->timecnt] = t;
+ sp->types[sp->timecnt] =
+ (sp->typecnt + ts->types[i]);
+ sp->timecnt++;
+ }
+ for (i = 0; i < ts->typecnt; i++)
+ sp->ttis[sp->typecnt++] = ts->ttis[i];
+ }
+ }
+ }
+ if (sp->typecnt == 0)
+ return EINVAL;
+ if (sp->timecnt > 1) {
+ if (sp->ats[0] <= TIME_T_MAX - SECSPERREPEAT) {
+ time_t repeatat = sp->ats[0] + SECSPERREPEAT;
+ int repeattype = sp->types[0];
+ for (i = 1; i < sp->timecnt; ++i)
+ if (sp->ats[i] == repeatat &&
+ typesequiv(sp, sp->types[i], repeattype)) {
+ sp->goback = true;
+ break;
+ }
+ }
+ if (TIME_T_MIN + SECSPERREPEAT <= sp->ats[sp->timecnt - 1]) {
+ time_t repeatat =
+ sp->ats[sp->timecnt - 1] - SECSPERREPEAT;
+ int repeattype = sp->types[sp->timecnt - 1];
+ for (i = sp->timecnt - 2; i >= 0; --i)
+ if (sp->ats[i] == repeatat &&
+ typesequiv(sp, sp->types[i], repeattype)) {
+ sp->goahead = true;
+ break;
+ }
+ }
+ }
+
+ /* Infer sp->defaulttype from the data. Although this default
+ type is always zero for data from recent tzdb releases,
+ things are trickier for data from tzdb 2018e or earlier.
+
+ The first set of heuristics work around bugs in 32-bit data
+ generated by tzdb 2013c or earlier. The workaround is for
+ zones like Australia/Macquarie where timestamps before the
+ first transition have a time type that is not the earliest
+ standard-time type. See:
+ https://mm.icann.org/pipermail/tz/2013-May/019368.html */
+ /*
+ ** If type 0 does not specify local time, or is unused in transitions,
+ ** it's the type to use for early times.
+ */
+ for (i = 0; i < sp->timecnt; ++i)
+ if (sp->types[i] == 0)
+ break;
+ i = i < sp->timecnt && !ttunspecified(sp, 0) ? -1 : 0;
+ /*
+ ** Absent the above,
+ ** if there are transition times
+ ** and the first transition is to a daylight time
+ ** find the standard type less than and closest to
+ ** the type of the first transition.
+ */
+ if (i < 0 && sp->timecnt > 0 && sp->ttis[sp->types[0]].tt_isdst) {
+ i = sp->types[0];
+ while (--i >= 0)
+ if (!sp->ttis[i].tt_isdst)
+ break;
+ }
+ /* The next heuristics are for data generated by tzdb 2018e or
+ earlier, for zones like EST5EDT where the first transition
+ is to DST. */
+ /*
+ ** If no result yet, find the first standard type.
+ ** If there is none, punt to type zero.
+ */
+ if (i < 0) {
+ i = 0;
+ while (sp->ttis[i].tt_isdst)
+ if (++i >= sp->typecnt) {
+ i = 0;
+ break;
+ }
+ }
+ /* A simple 'sp->defaulttype = 0;' would suffice here if we
+ didn't have to worry about 2018e-or-earlier data. Even
+ simpler would be to remove the defaulttype member and just
+ use 0 in its place. */
+ sp->defaulttype = i;
+
+ return 0;
+}
+
+/* Load tz data from the file named NAME into *SP. Read extended
+ format if DOEXTEND. Return 0 on success, an errno value on failure. */
+static int
+tzload(char const *name, struct state *sp, bool doextend)
+{
+#ifdef ALL_STATE
+ union local_storage *lsp = malloc(sizeof *lsp);
+ if (!lsp) {
+ return HAVE_MALLOC_ERRNO ? errno : ENOMEM;
+ } else {
+ int err = tzloadbody(name, sp, doextend, lsp);
+ free(lsp);
+ return err;
+ }
+#else
+ union local_storage ls;
+ return tzloadbody(name, sp, doextend, &ls);
+#endif
+}
+
+static bool
+typesequiv(const struct state *sp, int a, int b)
+{
+ bool result;
+
+ if (sp == NULL || a < 0 || a >= sp->typecnt || b < 0 ||
+ b >= sp->typecnt)
+ result = false;
+ else {
+ const struct ttinfo *ap = &sp->ttis[a];
+ const struct ttinfo *bp = &sp->ttis[b];
+ result = (ap->tt_utoff == bp->tt_utoff &&
+ ap->tt_isdst == bp->tt_isdst &&
+ ap->tt_ttisstd == bp->tt_ttisstd &&
+ ap->tt_ttisut == bp->tt_ttisut &&
+ (strcmp(&sp->chars[ap->tt_desigidx],
+ &sp->chars[bp->tt_desigidx]) == 0));
+ }
+ return result;
+}
+
+static const int mon_lengths[2][MONTHSPERYEAR] = {
+ { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
+ { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
+};
+
+static const int year_lengths[2] = { DAYSPERNYEAR, DAYSPERLYEAR };
+
+/*
+** Given a pointer into a timezone string, scan until a character that is not
+** a valid character in a time zone abbreviation is found.
+** Return a pointer to that character.
+*/
+
+static ATTRIBUTE_PURE const char *
+getzname(const char *strp)
+{
+ char c;
+
+ while ((c = *strp) != '\0' && !is_digit(c) && c != ',' && c != '-' &&
+ c != '+')
+ ++strp;
+ return strp;
+}
+
+/*
+** Given a pointer into an extended timezone string, scan until the ending
+** delimiter of the time zone abbreviation is located.
+** Return a pointer to the delimiter.
+**
+** As with getzname above, the legal character set is actually quite
+** restricted, with other characters producing undefined results.
+** We don't do any checking here; checking is done later in common-case code.
+*/
+
+static ATTRIBUTE_PURE const char *
+getqzname(const char *strp, const int delim)
+{
+ int c;
+
+ while ((c = *strp) != '\0' && c != delim)
+ ++strp;
+ return strp;
+}
+
+/*
+** Given a pointer into a timezone string, extract a number from that string.
+** Check that the number is within a specified range; if it is not, return
+** NULL.
+** Otherwise, return a pointer to the first character not part of the number.
+*/
+
+static const char *
+getnum(const char *strp, int *const nump, const int min, const int max)
+{
+ char c;
+ int num;
+
+ if (strp == NULL || !is_digit(c = *strp))
+ return NULL;
+ num = 0;
+ do {
+ num = num * 10 + (c - '0');
+ if (num > max)
+ return NULL; /* illegal value */
+ c = *++strp;
+ } while (is_digit(c));
+ if (num < min)
+ return NULL; /* illegal value */
+ *nump = num;
+ return strp;
+}
+
+/*
+** Given a pointer into a timezone string, extract a number of seconds,
+** in hh[:mm[:ss]] form, from the string.
+** If any error occurs, return NULL.
+** Otherwise, return a pointer to the first character not part of the number
+** of seconds.
+*/
+
+static const char *
+getsecs(const char *strp, int_fast32_t *const secsp)
+{
+ int num;
+ int_fast32_t secsperhour = SECSPERHOUR;
+
+ /*
+ ** 'HOURSPERDAY * DAYSPERWEEK - 1' allows quasi-Posix rules like
+ ** "M10.4.6/26", which does not conform to Posix,
+ ** but which specifies the equivalent of
+ ** "02:00 on the first Sunday on or after 23 Oct".
+ */
+ strp = getnum(strp, &num, 0, HOURSPERDAY * DAYSPERWEEK - 1);
+ if (strp == NULL)
+ return NULL;
+ *secsp = num * secsperhour;
+ if (*strp == ':') {
+ ++strp;
+ strp = getnum(strp, &num, 0, MINSPERHOUR - 1);
+ if (strp == NULL)
+ return NULL;
+ *secsp += num * SECSPERMIN;
+ if (*strp == ':') {
+ ++strp;
+ /* 'SECSPERMIN' allows for leap seconds. */
+ strp = getnum(strp, &num, 0, SECSPERMIN);
+ if (strp == NULL)
+ return NULL;
+ *secsp += num;
+ }
+ }
+ return strp;
+}
+
+/*
+** Given a pointer into a timezone string, extract an offset, in
+** [+-]hh[:mm[:ss]] form, from the string.
+** If any error occurs, return NULL.
+** Otherwise, return a pointer to the first character not part of the time.
+*/
+
+static const char *
+getoffset(const char *strp, int_fast32_t *const offsetp)
+{
+ bool neg = false;
+
+ if (*strp == '-') {
+ neg = true;
+ ++strp;
+ } else if (*strp == '+')
+ ++strp;
+ strp = getsecs(strp, offsetp);
+ if (strp == NULL)
+ return NULL; /* illegal time */
+ if (neg)
+ *offsetp = -*offsetp;
+ return strp;
+}
+
+/*
+** Given a pointer into a timezone string, extract a rule in the form
+** date[/time]. See POSIX section 8 for the format of "date" and "time".
+** If a valid rule is not found, return NULL.
+** Otherwise, return a pointer to the first character not part of the rule.
+*/
+
+static const char *
+getrule(const char *strp, struct rule *const rulep)
+{
+ if (*strp == 'J') {
+ /*
+ ** Julian day.
+ */
+ rulep->r_type = JULIAN_DAY;
+ ++strp;
+ strp = getnum(strp, &rulep->r_day, 1, DAYSPERNYEAR);
+ } else if (*strp == 'M') {
+ /*
+ ** Month, week, day.
+ */
+ rulep->r_type = MONTH_NTH_DAY_OF_WEEK;
+ ++strp;
+ strp = getnum(strp, &rulep->r_mon, 1, MONTHSPERYEAR);
+ if (strp == NULL)
+ return NULL;
+ if (*strp++ != '.')
+ return NULL;
+ strp = getnum(strp, &rulep->r_week, 1, 5);
+ if (strp == NULL)
+ return NULL;
+ if (*strp++ != '.')
+ return NULL;
+ strp = getnum(strp, &rulep->r_day, 0, DAYSPERWEEK - 1);
+ } else if (is_digit(*strp)) {
+ /*
+ ** Day of year.
+ */
+ rulep->r_type = DAY_OF_YEAR;
+ strp = getnum(strp, &rulep->r_day, 0, DAYSPERLYEAR - 1);
+ } else
+ return NULL; /* invalid format */
+ if (strp == NULL)
+ return NULL;
+ if (*strp == '/') {
+ /*
+ ** Time specified.
+ */
+ ++strp;
+ strp = getoffset(strp, &rulep->r_time);
+ } else
+ rulep->r_time = 2 * SECSPERHOUR; /* default = 2:00:00 */
+ return strp;
+}
+
+/*
+** Given a year, a rule, and the offset from UT at the time that rule takes
+** effect, calculate the year-relative time that rule takes effect.
+*/
+
+static int_fast32_t
+transtime(const int year, const struct rule *const rulep,
+ const int_fast32_t offset)
+{
+ bool leapyear;
+ int_fast32_t value;
+ int i;
+ int d, m1, yy0, yy1, yy2, dow;
+
+ leapyear = isleap(year);
+ switch (rulep->r_type) {
+
+ case JULIAN_DAY:
+ /*
+ ** Jn - Julian day, 1 == January 1, 60 == March 1 even in leap
+ ** years.
+ ** In non-leap years, or if the day number is 59 or less, just
+ ** add SECSPERDAY times the day number-1 to the time of
+ ** January 1, midnight, to get the day.
+ */
+ value = (rulep->r_day - 1) * SECSPERDAY;
+ if (leapyear && rulep->r_day >= 60)
+ value += SECSPERDAY;
+ break;
+
+ case DAY_OF_YEAR:
+ /*
+ ** n - day of year.
+ ** Just add SECSPERDAY times the day number to the time of
+ ** January 1, midnight, to get the day.
+ */
+ value = rulep->r_day * SECSPERDAY;
+ break;
+
+ case MONTH_NTH_DAY_OF_WEEK:
+ /*
+ ** Mm.n.d - nth "dth day" of month m.
+ */
+
+ /*
+ ** Use Zeller's Congruence to get day-of-week of first day of
+ ** month.
+ */
+ m1 = (rulep->r_mon + 9) % 12 + 1;
+ yy0 = (rulep->r_mon <= 2) ? (year - 1) : year;
+ yy1 = yy0 / 100;
+ yy2 = yy0 % 100;
+ dow = ((26 * m1 - 2) / 10 + 1 + yy2 + yy2 / 4 + yy1 / 4 -
+ 2 * yy1) %
+ 7;
+ if (dow < 0)
+ dow += DAYSPERWEEK;
+
+ /*
+ ** "dow" is the day-of-week of the first day of the month. Get
+ ** the day-of-month (zero-origin) of the first "dow" day of the
+ ** month.
+ */
+ d = rulep->r_day - dow;
+ if (d < 0)
+ d += DAYSPERWEEK;
+ for (i = 1; i < rulep->r_week; ++i) {
+ if (d + DAYSPERWEEK >=
+ mon_lengths[leapyear][rulep->r_mon - 1])
+ break;
+ d += DAYSPERWEEK;
+ }
+
+ /*
+ ** "d" is the day-of-month (zero-origin) of the day we want.
+ */
+ value = d * SECSPERDAY;
+ for (i = 0; i < rulep->r_mon - 1; ++i)
+ value += mon_lengths[leapyear][i] * SECSPERDAY;
+ break;
+
+ default:
+ UNREACHABLE();
+ }
+
+ /*
+ ** "value" is the year-relative time of 00:00:00 UT on the day in
+ ** question. To get the year-relative time of the specified local
+ ** time on that day, add the transition time and the current offset
+ ** from UT.
+ */
+ return value + rulep->r_time + offset;
+}
+
+/*
+** Given a POSIX section 8-style TZ string, fill in the rule tables as
+** appropriate.
+*/
+
+static bool
+tzparse(const char *name, struct state *sp, struct state *basep)
+{
+ const char *stdname;
+ const char *dstname;
+ size_t stdlen;
+ size_t dstlen;
+ size_t charcnt;
+ int_fast32_t stdoffset;
+ int_fast32_t dstoffset;
+ char *cp;
+ bool load_ok;
+ time_t atlo = TIME_T_MIN, leaplo = TIME_T_MIN;
+
+ stdname = name;
+ if (*name == '<') {
+ name++;
+ stdname = name;
+ name = getqzname(name, '>');
+ if (*name != '>')
+ return false;
+ stdlen = name - stdname;
+ name++;
+ } else {
+ name = getzname(name);
+ stdlen = name - stdname;
+ }
+ if (!stdlen)
+ return false;
+ name = getoffset(name, &stdoffset);
+ if (name == NULL)
+ return false;
+ charcnt = stdlen + 1;
+ if (sizeof sp->chars < charcnt)
+ return false;
+ if (basep) {
+ if (0 < basep->timecnt)
+ atlo = basep->ats[basep->timecnt - 1];
+ load_ok = false;
+ sp->leapcnt = basep->leapcnt;
+ memcpy(sp->lsis, basep->lsis, sp->leapcnt * sizeof *sp->lsis);
+ } else {
+ load_ok = tzload(TZDEFRULES, sp, false) == 0;
+ if (!load_ok)
+ sp->leapcnt = 0; /* So, we're off a little. */
+ }
+ if (0 < sp->leapcnt)
+ leaplo = sp->lsis[sp->leapcnt - 1].ls_trans;
+ if (*name != '\0') {
+ if (*name == '<') {
+ dstname = ++name;
+ name = getqzname(name, '>');
+ if (*name != '>')
+ return false;
+ dstlen = name - dstname;
+ name++;
+ } else {
+ dstname = name;
+ name = getzname(name);
+ dstlen = name - dstname; /* length of DST abbr. */
+ }
+ if (!dstlen)
+ return false;
+ charcnt += dstlen + 1;
+ if (sizeof sp->chars < charcnt)
+ return false;
+ if (*name != '\0' && *name != ',' && *name != ';') {
+ name = getoffset(name, &dstoffset);
+ if (name == NULL)
+ return false;
+ } else
+ dstoffset = stdoffset - SECSPERHOUR;
+ if (*name == '\0' && !load_ok)
+ name = TZDEFRULESTRING;
+ if (*name == ',' || *name == ';') {
+ struct rule start;
+ struct rule end;
+ int year;
+ int timecnt;
+ time_t janfirst;
+ int_fast32_t janoffset = 0;
+ int yearbeg, yearlim;
+
+ ++name;
+ if ((name = getrule(name, &start)) == NULL)
+ return false;
+ if (*name++ != ',')
+ return false;
+ if ((name = getrule(name, &end)) == NULL)
+ return false;
+ if (*name != '\0')
+ return false;
+ sp->typecnt = 2; /* standard time and DST */
+ /*
+ ** Two transitions per year, from EPOCH_YEAR forward.
+ */
+ init_ttinfo(&sp->ttis[0], -stdoffset, false, 0);
+ init_ttinfo(&sp->ttis[1], -dstoffset, true, stdlen + 1);
+ sp->defaulttype = 0;
+ timecnt = 0;
+ janfirst = 0;
+ yearbeg = EPOCH_YEAR;
+
+ do {
+ int_fast32_t yearsecs =
+ year_lengths[isleap(yearbeg - 1)] *
+ SECSPERDAY;
+ yearbeg--;
+ if (increment_overflow_time(&janfirst,
+ -yearsecs)) {
+ janoffset = -yearsecs;
+ break;
+ }
+ } while (atlo < janfirst &&
+ EPOCH_YEAR - YEARSPERREPEAT / 2 < yearbeg);
+
+ while (true) {
+ int_fast32_t yearsecs =
+ year_lengths[isleap(yearbeg)] *
+ SECSPERDAY;
+ int yearbeg1 = yearbeg;
+ time_t janfirst1 = janfirst;
+ if (increment_overflow_time(&janfirst1,
+ yearsecs) ||
+ increment_overflow(&yearbeg1, 1) ||
+ atlo <= janfirst1)
+ break;
+ yearbeg = yearbeg1;
+ janfirst = janfirst1;
+ }
+
+ yearlim = yearbeg;
+ if (increment_overflow(&yearlim, YEARSPERREPEAT + 1))
+ yearlim = INT_MAX;
+ for (year = yearbeg; year < yearlim; year++) {
+ int_fast32_t starttime = transtime(year, &start,
+ stdoffset),
+ endtime = transtime(year, &end,
+ dstoffset);
+ int_fast32_t yearsecs =
+ (year_lengths[isleap(year)] *
+ SECSPERDAY);
+ bool reversed = endtime < starttime;
+ if (reversed) {
+ int_fast32_t swap = starttime;
+ starttime = endtime;
+ endtime = swap;
+ }
+ if (reversed ||
+ (starttime < endtime &&
+ endtime - starttime < yearsecs)) {
+ if (TZ_MAX_TIMES - 2 < timecnt)
+ break;
+ sp->ats[timecnt] = janfirst;
+ if (!increment_overflow_time(
+ &sp->ats[timecnt],
+ janoffset + starttime) &&
+ atlo <= sp->ats[timecnt])
+ sp->types[timecnt++] =
+ !reversed;
+ sp->ats[timecnt] = janfirst;
+ if (!increment_overflow_time(
+ &sp->ats[timecnt],
+ janoffset + endtime) &&
+ atlo <= sp->ats[timecnt]) {
+ sp->types[timecnt++] = reversed;
+ }
+ }
+ if (endtime < leaplo) {
+ yearlim = year;
+ if (increment_overflow(&yearlim,
+ YEARSPERREPEAT +
+ 1))
+ yearlim = INT_MAX;
+ }
+ if (increment_overflow_time(
+ &janfirst, janoffset + yearsecs))
+ break;
+ janoffset = 0;
+ }
+ sp->timecnt = timecnt;
+ if (!timecnt) {
+ sp->ttis[0] = sp->ttis[1];
+ sp->typecnt = 1; /* Perpetual DST. */
+ } else if (YEARSPERREPEAT < year - yearbeg)
+ sp->goback = sp->goahead = true;
+ } else {
+ int_fast32_t theirstdoffset;
+ int_fast32_t theirdstoffset;
+ int_fast32_t theiroffset;
+ bool isdst;
+ int i;
+ int j;
+
+ if (*name != '\0')
+ return false;
+ /*
+ ** Initial values of theirstdoffset and theirdstoffset.
+ */
+ theirstdoffset = 0;
+ for (i = 0; i < sp->timecnt; ++i) {
+ j = sp->types[i];
+ if (!sp->ttis[j].tt_isdst) {
+ theirstdoffset = -sp->ttis[j].tt_utoff;
+ break;
+ }
+ }
+ theirdstoffset = 0;
+ for (i = 0; i < sp->timecnt; ++i) {
+ j = sp->types[i];
+ if (sp->ttis[j].tt_isdst) {
+ theirdstoffset = -sp->ttis[j].tt_utoff;
+ break;
+ }
+ }
+ /*
+ ** Initially we're assumed to be in standard time.
+ */
+ isdst = false;
+ /*
+ ** Now juggle transition times and types
+ ** tracking offsets as you do.
+ */
+ for (i = 0; i < sp->timecnt; ++i) {
+ j = sp->types[i];
+ sp->types[i] = sp->ttis[j].tt_isdst;
+ if (sp->ttis[j].tt_ttisut) {
+ /* No adjustment to transition time */
+ } else {
+ /*
+ ** If daylight saving time is in
+ ** effect, and the transition time was
+ ** not specified as standard time, add
+ ** the daylight saving time offset to
+ ** the transition time; otherwise, add
+ ** the standard time offset to the
+ ** transition time.
+ */
+ /*
+ ** Transitions from DST to DDST
+ ** will effectively disappear since
+ ** POSIX provides for only one DST
+ ** offset.
+ */
+ if (isdst && !sp->ttis[j].tt_ttisstd) {
+ sp->ats[i] += dstoffset -
+ theirdstoffset;
+ } else {
+ sp->ats[i] += stdoffset -
+ theirstdoffset;
+ }
+ }
+ theiroffset = -sp->ttis[j].tt_utoff;
+ if (sp->ttis[j].tt_isdst)
+ theirdstoffset = theiroffset;
+ else
+ theirstdoffset = theiroffset;
+ }
+ /*
+ ** Finally, fill in ttis.
+ */
+ init_ttinfo(&sp->ttis[0], -stdoffset, false, 0);
+ init_ttinfo(&sp->ttis[1], -dstoffset, true, stdlen + 1);
+ sp->typecnt = 2;
+ sp->defaulttype = 0;
+ }
+ } else {
+ dstlen = 0;
+ sp->typecnt = 1; /* only standard time */
+ sp->timecnt = 0;
+ init_ttinfo(&sp->ttis[0], -stdoffset, false, 0);
+ sp->defaulttype = 0;
+ }
+ sp->charcnt = charcnt;
+ cp = sp->chars;
+ memcpy(cp, stdname, stdlen);
+ cp += stdlen;
+ *cp++ = '\0';
+ if (dstlen != 0) {
+ memcpy(cp, dstname, dstlen);
+ *(cp + dstlen) = '\0';
+ }
+ return true;
+}
+
+/* Initialize *SP to a value appropriate for the TZ setting NAME.
+ Return 0 on success, an errno value on failure. */
+static int
+zoneinit(struct state *sp, char const *name)
+{
+ if (name && !name[0]) {
+ /*
+ ** User wants it fast rather than right.
+ */
+ sp->leapcnt = 0; /* so, we're off a little */
+ sp->timecnt = 0;
+ sp->typecnt = 0;
+ sp->charcnt = 0;
+ sp->goback = sp->goahead = false;
+ init_ttinfo(&sp->ttis[0], 0, false, 0);
+ strcpy(sp->chars, gmt);
+ sp->defaulttype = 0;
+ return 0;
+ } else {
+ int err = tzload(name, sp, true);
+ if (err != 0 && name && name[0] != ':' &&
+ tzparse(name, sp, NULL))
+ err = 0;
+ if (err == 0)
+ scrub_abbrs(sp);
+ return err;
+ }
+}
+
+#if NETBSD_INSPIRED
+
+timezone_t
+tzalloc(char const *name)
+{
+ timezone_t sp = malloc(sizeof *sp);
+ if (sp) {
+ int err = zoneinit(sp, name);
+ if (err != 0) {
+ free(sp);
+ errno = err;
+ return NULL;
+ }
+ } else if (!HAVE_MALLOC_ERRNO)
+ errno = ENOMEM;
+ return sp;
+}
+
+void
+tzfree(timezone_t sp)
+{
+ free(sp);
+}
+
+/*
+** NetBSD 6.1.4 has ctime_rz, but omit it because POSIX says ctime and
+** ctime_r are obsolescent and have potential security problems that
+** ctime_rz would share. Callers can instead use localtime_rz + strftime.
+**
+** NetBSD 6.1.4 has tzgetname, but omit it because it doesn't work
+** in zones with three or more time zone abbreviations.
+** Callers can instead use localtime_rz + strftime.
+*/
+
+#endif
+
+/*
+** The easy way to behave "as if no library function calls" localtime
+** is to not call it, so we drop its guts into "localsub", which can be
+** freely called. (And no, the PANS doesn't require the above behavior,
+** but it *is* desirable.)
+**
+** If successful and SETNAME is nonzero,
+** set the applicable parts of tzname, timezone and altzone;
+** however, it's OK to omit this step if the timezone is POSIX-compatible,
+** since in that case tzset should have already done this step correctly.
+** SETNAME's type is intfast32_t for compatibility with gmtsub,
+** but it is actually a boolean and its value should be 0 or 1.
+*/
+
+/*ARGSUSED*/
+static struct tm *
+localsub(struct state const *sp, time_t const *timep, int_fast32_t setname,
+ struct tm *const tmp)
+{
+ const struct ttinfo *ttisp;
+ int i;
+ struct tm *result;
+ const time_t t = *timep;
+
+ if (sp == NULL) {
+ /* Don't bother to set tzname etc.; tzset has already done it.
+ */
+ return gmtsub(gmtptr, timep, 0, tmp);
+ }
+ if ((sp->goback && t < sp->ats[0]) ||
+ (sp->goahead && t > sp->ats[sp->timecnt - 1])) {
+ time_t newt;
+ time_t seconds;
+ time_t years;
+
+ if (t < sp->ats[0])
+ seconds = sp->ats[0] - t;
+ else
+ seconds = t - sp->ats[sp->timecnt - 1];
+ --seconds;
+
+ /* Beware integer overflow, as SECONDS might
+ be close to the maximum time_t. */
+ years = seconds / SECSPERREPEAT * YEARSPERREPEAT;
+ seconds = years * AVGSECSPERYEAR;
+ years += YEARSPERREPEAT;
+ if (t < sp->ats[0])
+ newt = t + seconds + SECSPERREPEAT;
+ else
+ newt = t - seconds - SECSPERREPEAT;
+
+ if (newt < sp->ats[0] || newt > sp->ats[sp->timecnt - 1])
+ return NULL; /* "cannot happen" */
+ result = localsub(sp, &newt, setname, tmp);
+ if (result) {
+ int_fast64_t newy;
+
+ newy = result->tm_year;
+ if (t < sp->ats[0])
+ newy -= years;
+ else
+ newy += years;
+ if (!(INT_MIN <= newy && newy <= INT_MAX))
+ return NULL;
+ result->tm_year = newy;
+ }
+ return result;
+ }
+ if (sp->timecnt == 0 || t < sp->ats[0]) {
+ i = sp->defaulttype;
+ } else {
+ int lo = 1;
+ int hi = sp->timecnt;
+
+ while (lo < hi) {
+ int mid = (lo + hi) >> 1;
+
+ if (t < sp->ats[mid])
+ hi = mid;
+ else
+ lo = mid + 1;
+ }
+ i = sp->types[lo - 1];
+ }
+ ttisp = &sp->ttis[i];
+ /*
+ ** To get (wrong) behavior that's compatible with System V Release 2.0
+ ** you'd replace the statement below with
+ ** t += ttisp->tt_utoff;
+ ** timesub(&t, 0L, sp, tmp);
+ */
+ result = timesub(&t, ttisp->tt_utoff, sp, tmp);
+ if (result) {
+ result->tm_isdst = ttisp->tt_isdst;
+#ifdef TM_ZONE
+ result->TM_ZONE = (char *)&sp->chars[ttisp->tt_desigidx];
+#endif /* defined TM_ZONE */
+ if (setname)
+ update_tzname_etc(sp, ttisp);
+ }
+ return result;
+}
+
+#if NETBSD_INSPIRED
+
+struct tm *
+localtime_rz(struct state *sp, time_t const *timep, struct tm *tmp)
+{
+ return localsub(sp, timep, 0, tmp);
+}
+
+#endif
+
+/*
+** gmtsub is to gmtime as localsub is to localtime.
+*/
+
+static struct tm *
+gmtsub(struct state const *sp, time_t const *timep, int_fast32_t offset,
+ struct tm *tmp)
+{
+ struct tm *result;
+
+ result = timesub(timep, offset, gmtptr, tmp);
+#ifdef TM_ZONE
+ /*
+ ** Could get fancy here and deliver something such as
+ ** "+xx" or "-xx" if offset is non-zero,
+ ** but this is no time for a treasure hunt.
+ */
+ tmp->TM_ZONE = ((char *)(offset ? wildabbr : gmtptr->chars));
+#endif /* defined TM_ZONE */
+ (void)sp;
+ return result;
+}
+
+#ifdef STD_INSPIRED
+
+struct tm *
+offtime(const time_t *timep, long offset)
+{
+ gmtcheck();
+ return gmtsub(gmtptr, timep, offset, &tm);
+}
+
+#endif /* defined STD_INSPIRED */
+
+/*
+** Return the number of leap years through the end of the given year
+** where, to make the math easy, the answer for year zero is defined as zero.
+*/
+
+static time_t
+leaps_thru_end_of_nonneg(time_t y)
+{
+ return y / 4 - y / 100 + y / 400;
+}
+
+static time_t
+leaps_thru_end_of(time_t y)
+{
+ return (y < 0 ? -1 - leaps_thru_end_of_nonneg(-1 - y)
+ : leaps_thru_end_of_nonneg(y));
+}
+
+static struct tm *
+timesub(const time_t *timep, int_fast32_t offset, const struct state *sp,
+ struct tm *tmp)
+{
+ const struct lsinfo *lp;
+ time_t tdays;
+ const int *ip;
+ int_fast32_t corr;
+ int i;
+ int_fast32_t idays, rem, dayoff, dayrem;
+ time_t y;
+
+ /* If less than SECSPERMIN, the number of seconds since the
+ most recent positive leap second; otherwise, do not add 1
+ to localtime tm_sec because of leap seconds. */
+ time_t secs_since_posleap = SECSPERMIN;
+
+ corr = 0;
+ i = (sp == NULL) ? 0 : sp->leapcnt;
+ while (--i >= 0) {
+ lp = &sp->lsis[i];
+ if (*timep >= lp->ls_trans) {
+ corr = lp->ls_corr;
+ if ((i == 0 ? 0 : lp[-1].ls_corr) < corr)
+ secs_since_posleap = *timep - lp->ls_trans;
+ break;
+ }
+ }
+
+ /* Calculate the year, avoiding integer overflow even if
+ time_t is unsigned. */
+ tdays = *timep / SECSPERDAY;
+ rem = *timep % SECSPERDAY;
+ rem += offset % SECSPERDAY - corr % SECSPERDAY + 3 * SECSPERDAY;
+ dayoff = offset / SECSPERDAY - corr / SECSPERDAY + rem / SECSPERDAY - 3;
+ rem %= SECSPERDAY;
+ /* y = (EPOCH_YEAR
+ + floor((tdays + dayoff) / DAYSPERREPEAT) * YEARSPERREPEAT),
+ sans overflow. But calculate against 1570 (EPOCH_YEAR -
+ YEARSPERREPEAT) instead of against 1970 so that things work
+ for localtime values before 1970 when time_t is unsigned. */
+ dayrem = tdays % DAYSPERREPEAT;
+ dayrem += dayoff % DAYSPERREPEAT;
+ y = (EPOCH_YEAR - YEARSPERREPEAT +
+ ((1 + dayoff / DAYSPERREPEAT + dayrem / DAYSPERREPEAT -
+ ((dayrem % DAYSPERREPEAT) < 0) + tdays / DAYSPERREPEAT) *
+ YEARSPERREPEAT));
+ /* idays = (tdays + dayoff) mod DAYSPERREPEAT, sans overflow. */
+ idays = tdays % DAYSPERREPEAT;
+ idays += dayoff % DAYSPERREPEAT + 2 * DAYSPERREPEAT;
+ idays %= DAYSPERREPEAT;
+ /* Increase Y and decrease IDAYS until IDAYS is in range for Y. */
+ while (year_lengths[isleap(y)] <= idays) {
+ int tdelta = idays / DAYSPERLYEAR;
+ int_fast32_t ydelta = tdelta + !tdelta;
+ time_t newy = y + ydelta;
+ int leapdays;
+ leapdays =
+ leaps_thru_end_of(newy - 1) - leaps_thru_end_of(y - 1);
+ idays -= ydelta * DAYSPERNYEAR;
+ idays -= leapdays;
+ y = newy;
+ }
+
+ if (!TYPE_SIGNED(time_t) && y < TM_YEAR_BASE) {
+ int signed_y = y;
+ tmp->tm_year = signed_y - TM_YEAR_BASE;
+ } else if ((!TYPE_SIGNED(time_t) || INT_MIN + TM_YEAR_BASE <= y) &&
+ y - TM_YEAR_BASE <= INT_MAX)
+ tmp->tm_year = y - TM_YEAR_BASE;
+ else {
+ errno = EOVERFLOW;
+ return NULL;
+ }
+ tmp->tm_yday = idays;
+ /*
+ ** The "extra" mods below avoid overflow problems.
+ */
+ tmp->tm_wday =
+ (TM_WDAY_BASE +
+ ((tmp->tm_year % DAYSPERWEEK) * (DAYSPERNYEAR % DAYSPERWEEK)) +
+ leaps_thru_end_of(y - 1) -
+ leaps_thru_end_of(TM_YEAR_BASE - 1) + idays);
+ tmp->tm_wday %= DAYSPERWEEK;
+ if (tmp->tm_wday < 0)
+ tmp->tm_wday += DAYSPERWEEK;
+ tmp->tm_hour = rem / SECSPERHOUR;
+ rem %= SECSPERHOUR;
+ tmp->tm_min = rem / SECSPERMIN;
+ tmp->tm_sec = rem % SECSPERMIN;
+
+ /* Use "... ??:??:60" at the end of the localtime minute containing
+ the second just before the positive leap second. */
+ tmp->tm_sec += secs_since_posleap <= tmp->tm_sec;
+
+ ip = mon_lengths[isleap(y)];
+ for (tmp->tm_mon = 0; idays >= ip[tmp->tm_mon]; ++(tmp->tm_mon))
+ idays -= ip[tmp->tm_mon];
+ tmp->tm_mday = idays + 1;
+ tmp->tm_isdst = 0;
+#ifdef TM_GMTOFF
+ tmp->TM_GMTOFF = offset;
+#endif /* defined TM_GMTOFF */
+ return tmp;
+}
+
+char *
+ctime(const time_t *timep)
+{
+ /*
+ ** Section 4.12.3.2 of X3.159-1989 requires that
+ ** The ctime function converts the calendar time pointed to by
+ *timer * to local time in the form of a string. It is equivalent
+ *to * asctime(localtime(timer))
+ */
+ struct tm *tmp = localtime(timep);
+ return tmp ? asctime(tmp) : NULL;
+}
+
+char *
+ctime_r(const time_t *timep, char *buf)
+{
+ struct tm mytm;
+ struct tm *tmp = localtime_r(timep, &mytm);
+ return tmp ? asctime_r(tmp, buf) : NULL;
+}
+
+/*
+** Adapted from code provided by Robert Elz, who writes:
+** The "best" way to do mktime I think is based on an idea of Bob
+** Kridle's (so its said...) from a long time ago.
+** It does a binary search of the time_t space. Since time_t's are
+** just 32 bits, its a max of 32 iterations (even at 64 bits it
+** would still be very reasonable).
+*/
+
+#ifndef WRONG
+#define WRONG (-1)
+#endif /* !defined WRONG */
+
+/*
+** Normalize logic courtesy Paul Eggert.
+*/
+
+static bool
+increment_overflow(int *ip, int j)
+{
+ int const i = *ip;
+
+ /*
+ ** If i >= 0 there can only be overflow if i + j > INT_MAX
+ ** or if j > INT_MAX - i; given i >= 0, INT_MAX - i cannot overflow.
+ ** If i < 0 there can only be overflow if i + j < INT_MIN
+ ** or if j < INT_MIN - i; given i < 0, INT_MIN - i cannot overflow.
+ */
+ if ((i >= 0) ? (j > INT_MAX - i) : (j < INT_MIN - i))
+ return true;
+ *ip += j;
+ return false;
+}
+
+static bool
+increment_overflow_time(time_t *tp, int_fast32_t j)
+{
+ /*
+ ** This is like
+ ** 'if (! (TIME_T_MIN <= *tp + j && *tp + j <= TIME_T_MAX)) ...',
+ ** except that it does the right thing even if *tp + j would overflow.
+ */
+ if (!(j < 0 ? (TYPE_SIGNED(time_t) ? TIME_T_MIN - j <= *tp
+ : -1 - j < *tp)
+ : *tp <= TIME_T_MAX - j))
+ return true;
+ *tp += j;
+ return false;
+}
+
+#ifdef STD_INSPIRED
+
+time_t
+timelocal(struct tm *tmp)
+{
+ if (tmp != NULL)
+ tmp->tm_isdst = -1; /* in case it wasn't initialized */
+ return mktime(tmp);
+}
+
+time_t
+timegm(struct tm *tmp)
+{
+ return timeoff(tmp, 0);
+}
+
+time_t
+timeoff(struct tm *tmp, long offset)
+{
+ if (tmp)
+ tmp->tm_isdst = 0;
+ gmtcheck();
+ return time1(tmp, gmtsub, gmtptr, offset);
+}
+
+#endif /* defined STD_INSPIRED */
+
+static int_fast32_t
+leapcorr(struct state const *sp, time_t t)
+{
+ struct lsinfo const *lp;
+ int i;
+
+ i = sp->leapcnt;
+ while (--i >= 0) {
+ lp = &sp->lsis[i];
+ if (t >= lp->ls_trans)
+ return lp->ls_corr;
+ }
+ return 0;
+}
+
+#if TZ_TIME_T
+
+#if !USG_COMPAT
+#define daylight 0
+#define timezone 0
+#endif
+#if !ALTZONE
+#define altzone 0
+#endif
+
+/* Convert from the underlying system's time_t to the ersatz time_tz,
+ which is called 'time_t' in this file. Typically, this merely
+ converts the time's integer width. On some platforms, the system
+ time is local time not UT, or uses some epoch other than the POSIX
+ epoch.
+
+ Although this code appears to define a function named 'time' that
+ returns time_t, the macros in private.h cause this code to actually
+ define a function named 'tz_time' that returns tz_time_t. The call
+ to sys_time invokes the underlying system's 'time' function. */
+
+time_t
+time(time_t *p)
+{
+ time_t r = sys_time(0);
+ if (r != (time_t)-1) {
+ int_fast32_t offset =
+ EPOCH_LOCAL ? (daylight ? timezone : altzone) : 0;
+ if (increment_overflow32(&offset, -EPOCH_OFFSET) ||
+ increment_overflow_time(&r, offset)) {
+ errno = EOVERFLOW;
+ r = -1;
+ }
+ }
+ if (p)
+ *p = r;
+ return r;
+}
+
+#endif
diff --git a/src/lib/tzcode/private.h b/src/lib/tzcode/private.h
index 6859fc752fe3c6c788254bf86b547a244eef0253..1b1ff7e7d17926f6c648834fbfa5fb17a40d64c3 100644
--- a/src/lib/tzcode/private.h
+++ b/src/lib/tzcode/private.h
@@ -16,11 +16,37 @@
** Thank you!
*/
+/* This string was in the Factory zone through version 2016f. */
+#define GRANDPARENTED "Local time zone must be set--see zic manual page"
+
/*
** Defaults for preprocessor symbols.
** You can override these in your C compiler options, e.g. '-DHAVE_GETTEXT=1'.
*/
+#if !defined HAVE_GENERIC && defined __has_extension
+# if __has_extension(c_generic_selections)
+# define HAVE_GENERIC 1
+# else
+# define HAVE_GENERIC 0
+# endif
+#endif
+/* _Generic is buggy in pre-4.9 GCC. */
+#if !defined HAVE_GENERIC && defined __GNUC__
+# define HAVE_GENERIC (4 < __GNUC__ + (9 <= __GNUC_MINOR__))
+#endif
+#ifndef HAVE_GENERIC
+# define HAVE_GENERIC (201112 <= __STDC_VERSION__)
+#endif
+
+#ifndef HAVE_MALLOC_ERRNO
+#define HAVE_MALLOC_ERRNO 1
+#endif
+
+#ifndef NETBSD_INSPIRED
+# define NETBSD_INSPIRED 1
+#endif
+
/* Enable tm_gmtoff, tm_zone, and environ on GNUish systems. */
#define _GNU_SOURCE 1
@@ -45,6 +71,140 @@
#include <inttypes.h>
#include <stdint.h>
+#include <stdbool.h>
+#include <unistd.h>
+
+#if 3 <= __GNUC__
+# define ATTRIBUTE_CONST __attribute__((const))
+# define ATTRIBUTE_MALLOC __attribute__((__malloc__))
+# define ATTRIBUTE_PURE __attribute__((__pure__))
+# define ATTRIBUTE_FORMAT(spec) __attribute__((__format__ spec))
+#else
+# define ATTRIBUTE_CONST /* empty */
+# define ATTRIBUTE_MALLOC /* empty */
+# define ATTRIBUTE_PURE /* empty */
+# define ATTRIBUTE_FORMAT(spec) /* empty */
+#endif
+
+/*
+** Workarounds for compilers/systems.
+*/
+
+#ifndef EPOCH_LOCAL
+# define EPOCH_LOCAL 0
+#endif
+#ifndef EPOCH_OFFSET
+# define EPOCH_OFFSET 0
+#endif
+#ifndef RESERVE_STD_EXT_IDS
+# define RESERVE_STD_EXT_IDS 0
+#endif
+
+/* If standard C identifiers with external linkage (e.g., localtime)
+ are reserved and are not already being renamed anyway, rename them
+ as if compiling with '-Dtime_tz=time_t'. */
+#if !defined time_tz && RESERVE_STD_EXT_IDS && USE_LTZ
+# define time_tz time_t
+#endif
+
+/*
+** Compile with -Dtime_tz=T to build the tz package with a private
+** time_t type equivalent to T rather than the system-supplied time_t.
+** This debugging feature can test unusual design decisions
+** (e.g., time_t wider than 'long', or unsigned time_t) even on
+** typical platforms.
+*/
+#if defined time_tz || EPOCH_LOCAL || EPOCH_OFFSET != 0
+# define TZ_TIME_T 1
+#else
+# define TZ_TIME_T 0
+#endif
+
+#if defined LOCALTIME_IMPLEMENTATION && TZ_TIME_T
+static time_t sys_time(time_t *x) { return time(x); }
+#endif
+
+#ifndef HAVE_DECL_ENVIRON
+# if defined environ || defined __USE_GNU
+# define HAVE_DECL_ENVIRON 1
+# else
+# define HAVE_DECL_ENVIRON 0
+# endif
+#endif
+
+#if !HAVE_DECL_ENVIRON
+extern char **environ;
+#endif
+
+#if 2 <= HAVE_TZNAME + (TZ_TIME_T || !HAVE_POSIX_DECLS)
+extern char *tzname[];
+#endif
+#if 2 <= USG_COMPAT + (TZ_TIME_T || !HAVE_POSIX_DECLS)
+extern long timezone;
+extern int daylight;
+#endif
+#if 2 <= ALTZONE + (TZ_TIME_T || !HAVE_POSIX_DECLS)
+extern long altzone;
+#endif
+
+#ifdef STD_INSPIRED
+# if TZ_TIME_T || !defined offtime
+struct tm *offtime(time_t const *, long);
+# endif
+# if TZ_TIME_T || !defined timegm
+time_t timegm(struct tm *);
+# endif
+# if TZ_TIME_T || !defined timelocal
+time_t timelocal(struct tm *);
+# endif
+# if TZ_TIME_T || !defined timeoff
+time_t timeoff(struct tm *, long);
+# endif
+# if TZ_TIME_T || !defined time2posix
+time_t time2posix(time_t);
+# endif
+# if TZ_TIME_T || !defined posix2time
+time_t posix2time(time_t);
+# endif
+#endif
+
+/* Infer TM_ZONE on systems where this information is known, but suppress
+ guessing if NO_TM_ZONE is defined. Similarly for TM_GMTOFF. */
+#if (defined __GLIBC__ \
+ || defined __FreeBSD__ || defined __NetBSD__ || defined __OpenBSD__ \
+ || (defined __APPLE__ && defined __MACH__))
+# if !defined TM_GMTOFF && !defined NO_TM_GMTOFF
+# define TM_GMTOFF tm_gmtoff
+# endif
+# if !defined TM_ZONE && !defined NO_TM_ZONE
+# define TM_ZONE tm_zone
+# endif
+#endif
+
+/*
+** Define functions that are ABI compatible with NetBSD but have
+** better prototypes. NetBSD 6.1.4 defines a pointer type timezone_t
+** and labors under the misconception that 'const timezone_t' is a
+** pointer to a constant. This use of 'const' is ineffective, so it
+** is not done here. What we call 'struct state' NetBSD calls
+** 'struct __state', but this is a private name so it doesn't matter.
+*/
+#if NETBSD_INSPIRED
+typedef struct state *timezone_t;
+struct tm *localtime_rz(timezone_t restrict, time_t const *restrict,
+ struct tm *restrict);
+time_t mktime_z(timezone_t restrict, struct tm *restrict);
+timezone_t tzalloc(char const *);
+void tzfree(timezone_t);
+# ifdef STD_INSPIRED
+# if TZ_TIME_T || !defined posix2time_z
+time_t posix2time_z(timezone_t, time_t) ATTRIBUTE_PURE;
+# endif
+# if TZ_TIME_T || !defined time2posix_z
+time_t time2posix_z(timezone_t, time_t) ATTRIBUTE_PURE;
+# endif
+# endif
+#endif
/*
** Finally, some convenience items.
@@ -54,6 +214,43 @@
#define TYPE_SIGNED(type) (((type)-1) < 0)
#define TWOS_COMPLEMENT(t) ((t) ~(t)0 < 0)
+/* Max and min values of the integer type T, of which only the bottom
+ B bits are used, and where the highest-order used bit is considered
+ to be a sign bit if T is signed. */
+#define MAXVAL(t, b) \
+ ((t) (((t) 1 << ((b) - 1 - TYPE_SIGNED(t))) \
+ - 1 + ((t) 1 << ((b) - 1 - TYPE_SIGNED(t)))))
+#define MINVAL(t, b) \
+ ((t) (TYPE_SIGNED(t) ? - TWOS_COMPLEMENT(t) - MAXVAL(t, b) : 0))
+
+/* The extreme time values, assuming no padding. */
+#define TIME_T_MIN_NO_PADDING MINVAL(time_t, TYPE_BIT(time_t))
+#define TIME_T_MAX_NO_PADDING MAXVAL(time_t, TYPE_BIT(time_t))
+
+/* The extreme time values. These are macros, not constants, so that
+ any portability problems occur only when compiling .c files that use
+ the macros, which is safer for applications that need only zdump and zic.
+ This implementation assumes no padding if time_t is signed and
+ either the compiler lacks support for _Generic or time_t is not one
+ of the standard signed integer types. */
+#if HAVE_GENERIC
+# define TIME_T_MIN \
+ _Generic((time_t) 0, \
+ signed char: SCHAR_MIN, short: SHRT_MIN, \
+ int: INT_MIN, long: LONG_MIN, long long: LLONG_MIN, \
+ default: TIME_T_MIN_NO_PADDING)
+# define TIME_T_MAX \
+ (TYPE_SIGNED(time_t) \
+ ? _Generic((time_t) 0, \
+ signed char: SCHAR_MAX, short: SHRT_MAX, \
+ int: INT_MAX, long: LONG_MAX, long long: LLONG_MAX, \
+ default: TIME_T_MAX_NO_PADDING) \
+ : (time_t) -1)
+#else
+# define TIME_T_MIN TIME_T_MIN_NO_PADDING
+# define TIME_T_MAX TIME_T_MAX_NO_PADDING
+#endif
+
/*
** 302 / 1000 is log10(2.0) rounded up.
** Subtract one for the sign bit if the type is signed;
@@ -64,6 +261,39 @@
((TYPE_BIT(type) - TYPE_SIGNED(type)) * 302 / 1000 + \
1 + TYPE_SIGNED(type))
+/*
+** INITIALIZE(x)
+*/
+
+#ifdef GCC_LINT
+# define INITIALIZE(x) ((x) = 0)
+#else
+# define INITIALIZE(x)
+#endif
+
+/* Whether memory access must strictly follow the C standard.
+ If 0, it's OK to read uninitialized storage so long as the value is
+ not relied upon. Defining it to 0 lets mktime access parts of
+ struct tm that might be uninitialized, as a heuristic when the
+ standard doesn't say what to return and when tm_gmtoff can help
+ mktime likely infer a better value. */
+#ifndef UNINIT_TRAP
+# define UNINIT_TRAP 0
+#endif
+
+#ifdef DEBUG
+# define UNREACHABLE() abort()
+#elif 4 < __GNUC__ + (5 <= __GNUC_MINOR__)
+# define UNREACHABLE() __builtin_unreachable()
+#elif defined __has_builtin
+# if __has_builtin(__builtin_unreachable)
+# define UNREACHABLE() __builtin_unreachable()
+# endif
+#endif
+#ifndef UNREACHABLE
+# define UNREACHABLE() ((void) 0)
+#endif
+
/* Handy macros that are independent of tzfile implementation. */
#define YEARSPERREPEAT 400 /* years before a Gregorian repeat */
@@ -77,6 +307,12 @@
#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
#define SECSPERDAY ((int_fast32_t) SECSPERHOUR * HOURSPERDAY)
#define MONTHSPERYEAR 12
+
+#define YEARSPERREPEAT 400 /* years before a Gregorian repeat */
+#define DAYSPERREPEAT ((int_fast32_t) 400 * 365 + 100 - 4 + 1)
+#define SECSPERREPEAT ((int_fast64_t) DAYSPERREPEAT * SECSPERDAY)
+#define AVGSECSPERYEAR (SECSPERREPEAT / YEARSPERREPEAT)
+
#define TM_SUNDAY 0
#define TM_MONDAY 1
#define TM_TUESDAY 2
@@ -96,7 +332,10 @@
#define TM_OCTOBER 9
#define TM_NOVEMBER 10
#define TM_DECEMBER 11
-#define TM_YEAR_BASE 1900
+
+#define TM_YEAR_BASE 1900
+#define TM_WDAY_BASE TM_MONDAY
+
#define EPOCH_YEAR 1970
#define EPOCH_WDAY TM_THURSDAY
diff --git a/src/lib/tzcode/tzfile.h b/src/lib/tzcode/tzfile.h
new file mode 100644
index 0000000000000000000000000000000000000000..c3b1c39616f49fb11e6c31b9da3de5f32e70a88d
--- /dev/null
+++ b/src/lib/tzcode/tzfile.h
@@ -0,0 +1,122 @@
+/* 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.
+*/
+
+/*
+** 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.
+*/
+
+#ifndef TZDIR
+#define TZDIR "/usr/share/zoneinfo" /* Time zone object file directory */
+#endif /* !defined TZDIR */
+
+#ifndef TZDEFAULT
+#define TZDEFAULT "/etc/localtime"
+#endif /* !defined TZDEFAULT */
+
+#ifndef TZDEFRULES
+#define TZDEFRULES "posixrules"
+#endif /* !defined TZDEFRULES */
+
+/* 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'-'4' as of 2021 */
+ 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.
+*/
+
+#ifndef TZ_MAX_TIMES
+#define TZ_MAX_TIMES 2000
+#endif /* !defined TZ_MAX_TIMES */
+
+#ifndef TZ_MAX_TYPES
+/* 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 */
+#endif /* !defined TZ_MAX_TYPES */
+
+#ifndef TZ_MAX_CHARS
+#define TZ_MAX_CHARS 50 /** Maximum number of abbreviation characters */
+/* (limited by what unsigned chars can hold) */
+#endif /* !defined TZ_MAX_CHARS */
+
+#ifndef TZ_MAX_LEAPS
+#define TZ_MAX_LEAPS 50 /** Maximum number of leap second corrections */
+#endif /* !defined TZ_MAX_LEAPS */
+
+#endif /* !defined TZFILE_H */