xref: /src/lib/libc/time/localtime.c

/*	$NetBSD: localtime.c,v 1.124 2021/10/22 14:26:04 christos Exp $	*/

/* 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.
*/

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char	elsieid[] = "@(#)localtime.c	8.17";
#else
__RCSID("$NetBSD: localtime.c,v 1.124 2021/10/22 14:26:04 christos Exp $");
#endif
#endif /* LIBC_SCCS and not lint */

/*
** Leap second handling from Bradley White.
** POSIX-style TZ environment variable handling from Guy Harris.
*/

/*LINTLIBRARY*/

#include "namespace.h"
#include <assert.h>
#define LOCALTIME_IMPLEMENTATION
#include "private.h"

#include "tzfile.h"
#include <fcntl.h>

#if defined(__weak_alias)
__weak_alias(daylight,_daylight)
__weak_alias(tzname,_tzname)
#endif

#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 | O_CLOEXEC)
#endif /* defined O_BINARY */
#ifndef O_BINARY
#define OPEN_MODE	(O_RDONLY | O_CLOEXEC)
#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))

#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 */

#define state __state
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[/*CONSTCOND*/BIGGEST(BIGGEST(TZ_MAX_CHARS + 1,
				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 bool normalize_overflow32(int_fast32_t *, int *, int);
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 *);

static timezone_t gmtptr;

#ifndef TZ_STRLEN_MAX
#define TZ_STRLEN_MAX 255
#endif /* !defined TZ_STRLEN_MAX */

static char		lcl_TZname[TZ_STRLEN_MAX + 1];
static int		lcl_is_set;


#if !defined(__LIBC12_SOURCE__)
timezone_t __lclptr;
#ifdef _REENTRANT
rwlock_t __lcl_lock = RWLOCK_INITIALIZER;
#endif
#endif

/*
** Section 4.12.3 of X3.159-1989 requires that
**	Except for the strftime function, these functions [asctime,
**	ctime, gmtime, localtime] return values in one of two static
**	objects: a broken-down time structure and an array of char.
** Thanks to Paul Eggert for noting this.
*/

static struct tm	tm;

#if 2 <= HAVE_TZNAME + TZ_TIME_T || defined(__NetBSD__)
# if !defined(__LIBC12_SOURCE__)

__aconst char *		tzname[2] = {
	(__aconst char *)__UNCONST(wildabbr),
	(__aconst char *)__UNCONST(wildabbr)
};

# else

extern __aconst char *	tzname[2];

# endif /* __LIBC12_SOURCE__ */
#endif

#if 2 <= USG_COMPAT + TZ_TIME_T || defined(__NetBSD__)
# if !defined(__LIBC12_SOURCE__)
long 			timezone = 0;
int			daylight = 0;
# else
extern int		daylight;
extern long		timezone __RENAME(__timezone13);
# endif /* __LIBC12_SOURCE__ */
#endif /* 2<= USG_COMPAT + TZ_TIME_T */

#if 2 <= ALTZONE + TZ_TIME_T
long			altzone = 0;
#endif /* 2 <= ALTZONE + TZ_TIME_T */

/* 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;
}

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;
}

#include <stdio.h>

const char *
tzgetname(const timezone_t sp, int isdst)
{
	int i;
	const char *name = NULL;
	for (i = 0; i < sp->typecnt; ++i) {
		const struct ttinfo *const ttisp = &sp->ttis[i];
		if (ttisp->tt_isdst == isdst)
			name = &sp->chars[ttisp->tt_desigidx];
	}
	if (name != NULL)
		return name;
	errno = ESRCH;
	return NULL;
}

long
tzgetgmtoff(const timezone_t sp, int isdst)
{
	int i;
	long l = -1;
	for (i = 0; i < sp->typecnt; ++i) {
		const struct ttinfo *const ttisp = &sp->ttis[i];

		if (ttisp->tt_isdst == isdst) {
			l = ttisp->tt_utoff;
		}
	}
	if (l == -1)
		errno = ESRCH;
	return l;
}

static void
update_tzname_etc(const struct state *sp, const struct ttinfo *ttisp)
{
#if HAVE_TZNAME
	tzname[ttisp->tt_isdst] = __UNCONST(&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 /* ALTZONE */
}

static void
settzname(void)
{
	timezone_t const	sp = __lclptr;
	int			i;

#if HAVE_TZNAME
	tzname[0] = tzname[1] =
	    (__aconst char *) __UNCONST(sp ? wildabbr : gmt);
#endif
#if USG_COMPAT
	daylight = 0;
	timezone = 0;
#endif
#if ALTZONE
	altzone = 0;
#endif
	if (sp == NULL) {
		return;
	}
	/*
	** And to get the latest time zone abbreviations into tzname. . .
	*/
	for (i = 0; i < sp->typecnt; ++i)
		update_tzname_etc(sp, &sp->ttis[i]);

	for (i = 0; i < sp->timecnt; ++i) {
		const struct ttinfo * const ttisp = &sp->ttis[sp->types[i]];
		update_tzname_etc(sp, ttisp);
#if USG_COMPAT
		if (ttisp->tt_isdst)
			daylight = 1;
#endif
	}
}

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[/*CONSTCOND*/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;
	size_t			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, '.')) != NULL; 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 < (ssize_t)tzheadsize) {
		int err = nread < 0 ? errno : EINVAL;
		close(fid);
		return err;
	}
	if (close(fid) < 0)
		return errno;
	for (stored = 4; stored <= 8; stored *= 2) {
		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
		       && (ttisstdcnt == typecnt || ttisstdcnt == 0)
		       && (ttisutcnt == typecnt || ttisutcnt == 0)))
		  return EINVAL;
		if ((size_t)nread
		    < (tzheadsize		/* struct tzhead */
		       + timecnt * stored	/* ats */
		       + timecnt		/* types */
		       + typecnt * 6		/* ttinfos */
		       + charcnt		/* chars */
		       + leapcnt * (stored + 4)	/* lsinfos */
		       + ttisstdcnt		/* ttisstds */
		       + ttisutcnt))		/* ttisuts */
		  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 : (time_t)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++;
		sp->chars[i] = '\0';	/* ensure '\0' at end */

		/* 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;
			if (tr <= TIME_T_MAX) {
		    /* 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;

				sp->lsis[leapcnt].ls_trans =
				    (time_t)(prevtr = tr);
				sp->lsis[leapcnt].ls_corr = prevcorr = 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++;
			}
		}
		/*
		** If this is an old file, we're done.
		*/
		if (up->tzhead.tzh_version[0] == '\0')
			break;
		nread -= p - up->buf;
		memmove(up->buf, p, (size_t)nread);
	}
	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)) {
			      size_t tsabbrlen = strlen(tsabbr);
			      if (j + tsabbrlen < TZ_MAX_CHARS) {
				strcpy(sp->chars + j, tsabbr);
				charcnt = (int_fast32_t)(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)(TIME_T_MAX - SECSPERREPEAT)) {
		time_t repeatat = (time_t)(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)(TIME_T_MIN + SECSPERREPEAT) <= sp->ats[sp->timecnt - 1]) {
		time_t repeatat =
		    (time_t)(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 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 ? -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)
{
	union local_storage *lsp = malloc(sizeof *lsp);
	if (!lsp) {
		return /*CONSTCOND*/HAVE_MALLOC_ERRNO ? errno : ENOMEM;
	} else {
		int err = tzloadbody(name, sp, doextend, lsp);
		free(lsp);
		return err;
	}
}

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][MONSPERYEAR] = {
	{ 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
};

/* Is C an ASCII digit?  */
static bool
is_digit(char c)
{
  return '0' <= c && c <= '9';
}

/*
** 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)) {
		errno = EINVAL;
		return NULL;
	}
	num = 0;
	do {
		num = num * 10 + (c - '0');
		if (num > max) {
			errno = EOVERFLOW;
			return NULL;	/* illegal value */
		}
		c = *++strp;
	} while (is_digit(c));
	if (num < min) {
		errno = EINVAL;
		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, MONSPERYEAR);
		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;

	dstname = NULL; /* XXX gcc */
	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,
			    (int)(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);

			for (;;) {
			  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] += (time_t)
						    (dstoffset - theirdstoffset);
					} else {
						sp->ats[i] += (time_t)
						    (stdoffset - theirstdoffset);
					}
				}
				theiroffset = -sp->ttis[j].tt_utoff;
				if (sp->ttis[j].tt_isdst)
					theirstdoffset = theiroffset;
				else	theirdstoffset = theiroffset;
			}
			/*
			** Finally, fill in ttis.
			*/
			init_ttinfo(&sp->ttis[0], -stdoffset, false, 0);
			init_ttinfo(&sp->ttis[1], -dstoffset, true,
			    (int)(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);
		init_ttinfo(&sp->ttis[1], 0, false, 0);
		sp->defaulttype = 0;
	}
	sp->charcnt = (int)charcnt;
	cp = sp->chars;
	memcpy(cp, stdname, stdlen);
	cp += stdlen;
	*cp++ = '\0';
	if (dstlen != 0) {
		(void) memcpy(cp, dstname, dstlen);
		*(cp + dstlen) = '\0';
	}
	return true;
}

static void
gmtload(struct state *const sp)
{
	if (tzload(gmt, sp, true) != 0)
		(void) tzparse("GMT0", sp, NULL);
}

/* 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 = 1;
		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;
	}
}

static void
tzsetlcl(char const *name)
{
	struct state *sp = __lclptr;
	int lcl = name ? strlen(name) < sizeof lcl_TZname : -1;
	if (lcl < 0 ? lcl_is_set < 0
	    : 0 < lcl_is_set && strcmp(lcl_TZname, name) == 0)
		return;

	if (! sp)
		__lclptr = sp = malloc(sizeof *__lclptr);
	if (sp) {
		if (zoneinit(sp, name) != 0)
			zoneinit(sp, "");
		if (0 < lcl)
			strcpy(lcl_TZname, name);
	}
	settzname();
	lcl_is_set = lcl;
}

#ifdef STD_INSPIRED
void
tzsetwall(void)
{
	rwlock_wrlock(&__lcl_lock);
	tzsetlcl(NULL);
	rwlock_unlock(&__lcl_lock);
}
#endif

void
tzset_unlocked(void)
{
	tzsetlcl(getenv("TZ"));
}

void
tzset(void)
{
	rwlock_wrlock(&__lcl_lock);
	tzset_unlocked();
	rwlock_unlock(&__lcl_lock);
}

static void
gmtcheck(void)
{
	static bool gmt_is_set;
	rwlock_wrlock(&__lcl_lock);
	if (! gmt_is_set) {
		gmtptr = malloc(sizeof *gmtptr);
		if (gmtptr)
			gmtload(gmtptr);
		gmt_is_set = true;
	}
	rwlock_unlock(&__lcl_lock);
}

#if NETBSD_INSPIRED

timezone_t
tzalloc(const char *name)
{
	timezone_t sp = malloc(sizeof *sp);
	if (sp) {
		int err = zoneinit(sp, name);
		if (err != 0) {
			free(sp);
			errno = err;
			return NULL;
		}
	}
#if !HAVE_MALLOC_ERRNO
	} else
		errno = ENOMEM;
#endif
	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 = (time_t)(seconds / SECSPERREPEAT
			    * YEARSPERREPEAT);
			seconds = (time_t)(years * AVGSECSPERYEAR);
			years += YEARSPERREPEAT;
			if (t < sp->ats[0])
			  newt = (time_t)(t + seconds + SECSPERREPEAT);
			else
			  newt = (time_t)(t - seconds - SECSPERREPEAT);

			if (newt < sp->ats[0] ||
				newt > sp->ats[sp->timecnt - 1]) {
				errno = EINVAL;
				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)) {
					errno = EOVERFLOW;
					return NULL;
				}
				result->tm_year = (int)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) / 2;

			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 = __UNCONST(&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(timezone_t sp, time_t const *timep, struct tm *tmp)
{
	return localsub(sp, timep, 0, tmp);
}

#endif

static struct tm *
localtime_tzset(time_t const *timep, struct tm *tmp, bool setname)
{
	rwlock_wrlock(&__lcl_lock);
	if (setname || !lcl_is_set)
		tzset_unlocked();
	tmp = localsub(__lclptr, timep, setname, tmp);
	rwlock_unlock(&__lcl_lock);
	return tmp;
}

struct tm *
localtime(const time_t *timep)
{
	return localtime_tzset(timep, &tm, true);
}

struct tm *
localtime_r(const time_t * __restrict timep, struct tm *tmp)
{
	return localtime_tzset(timep, tmp, true);
}

/*
** gmtsub is to gmtime as localsub is to localtime.
*/

static struct tm *
gmtsub(struct state const *sp, const time_t *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.
	*/
	if (result)
		result->TM_ZONE = offset ? __UNCONST(wildabbr) : gmtptr ?
		    gmtptr->chars : __UNCONST(gmt);
#endif /* defined TM_ZONE */
	return result;
}


/*
** Re-entrant version of gmtime.
*/

struct tm *
gmtime_r(const time_t *timep, struct tm *tmp)
{
	gmtcheck();
	return gmtsub(NULL, timep, 0, tmp);
}

struct tm *
gmtime(const time_t *timep)
{
	return gmtime_r(timep, &tm);
}

#ifdef STD_INSPIRED

struct tm *
offtime(const time_t *timep, long offset)
{
	gmtcheck();
	return gmtsub(gmtptr, timep, (int_fast32_t)offset, &tm);
}

struct tm *
offtime_r(const time_t *timep, long offset, struct tm *tmp)
{
	gmtcheck();
	return gmtsub(NULL, timep, (int_fast32_t)offset, tmp);
}

#endif /* defined STD_INSPIRED */

#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

/*
** 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(const 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 = (time_t)(*timep / SECSPERDAY);
	rem = (int)(*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 = (int)(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 = (int)(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 = (int)(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 = (int)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 = (int)(y - TM_YEAR_BASE);
	else {
	  errno = EOVERFLOW;
	  return NULL;
	}
	tmp->tm_yday = idays;
	/*
	** The "extra" mods below avoid overflow problems.
	*/
	tmp->tm_wday = (int)(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 = (int) (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;
}

char *
ctime_rz(const timezone_t sp, const time_t * timep, char *buf)
{
	struct tm	mytm, *rtm;

	rtm = localtime_rz(sp, timep, &mytm);
	if (rtm == NULL)
		return NULL;
	return asctime_r(rtm, buf);
}

/*
** 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	((time_t)-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_overflow32(int_fast32_t *const lp, int const m)
{
	int_fast32_t const l = *lp;

	if ((l >= 0) ? (m > INT_FAST32_MAX - l) : (m < INT_FAST32_MIN - l))
		return true;
	*lp += m;
	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;
}

static bool
normalize_overflow(int *const tensptr, int *const unitsptr, const int base)
{
	int	tensdelta;

	tensdelta = (*unitsptr >= 0) ?
		(*unitsptr / base) :
		(-1 - (-1 - *unitsptr) / base);
	*unitsptr -= tensdelta * base;
	return increment_overflow(tensptr, tensdelta);
}

static bool
normalize_overflow32(int_fast32_t *tensptr, int *unitsptr, int base)
{
	int	tensdelta;

	tensdelta = (*unitsptr >= 0) ?
		(*unitsptr / base) :
		(-1 - (-1 - *unitsptr) / base);
	*unitsptr -= tensdelta * base;
	return increment_overflow32(tensptr, tensdelta);
}

static int
tmcomp(const struct tm *const atmp,
       const struct tm *const btmp)
{
	int	result;

	if (atmp->tm_year != btmp->tm_year)
		return atmp->tm_year < btmp->tm_year ? -1 : 1;
	if ((result = (atmp->tm_mon - btmp->tm_mon)) == 0 &&
		(result = (atmp->tm_mday - btmp->tm_mday)) == 0 &&
		(result = (atmp->tm_hour - btmp->tm_hour)) == 0 &&
		(result = (atmp->tm_min - btmp->tm_min)) == 0)
			result = atmp->tm_sec - btmp->tm_sec;
	return result;
}

static time_t
time2sub(struct tm *const tmp,
	 struct tm *(*funcp)(struct state const *, time_t const *,
			     int_fast32_t, struct tm *),
	 struct state const *sp,
 	 const int_fast32_t offset,
	 bool *okayp,
	 bool do_norm_secs)
{
	int			dir;
	int			i, j;
	int			saved_seconds;
	int_fast32_t		li;
	time_t			lo;
	time_t			hi;
#ifdef NO_ERROR_IN_DST_GAP
	time_t			ilo;
#endif
	int_fast32_t		y;
	time_t			newt;
	time_t			t;
	struct tm		yourtm, mytm;

	*okayp = false;
	yourtm = *tmp;
#ifdef NO_ERROR_IN_DST_GAP
again:
#endif
	if (do_norm_secs) {
		if (normalize_overflow(&yourtm.tm_min, &yourtm.tm_sec,
		    SECSPERMIN))
			goto out_of_range;
	}
	if (normalize_overflow(&yourtm.tm_hour, &yourtm.tm_min, MINSPERHOUR))
		goto out_of_range;
	if (normalize_overflow(&yourtm.tm_mday, &yourtm.tm_hour, HOURSPERDAY))
		goto out_of_range;
	y = yourtm.tm_year;
	if (normalize_overflow32(&y, &yourtm.tm_mon, MONSPERYEAR))
		goto out_of_range;
	/*
	** Turn y into an actual year number for now.
	** It is converted back to an offset from TM_YEAR_BASE later.
	*/
	if (increment_overflow32(&y, TM_YEAR_BASE))
		goto out_of_range;
	while (yourtm.tm_mday <= 0) {
		if (increment_overflow32(&y, -1))
			goto out_of_range;
		li = y + (1 < yourtm.tm_mon);
		yourtm.tm_mday += year_lengths[isleap(li)];
	}
	while (yourtm.tm_mday > DAYSPERLYEAR) {
		li = y + (1 < yourtm.tm_mon);
		yourtm.tm_mday -= year_lengths[isleap(li)];
		if (increment_overflow32(&y, 1))
			goto out_of_range;
	}
	for ( ; ; ) {
		i = mon_lengths[isleap(y)][yourtm.tm_mon];
		if (yourtm.tm_mday <= i)
			break;
		yourtm.tm_mday -= i;
		if (++yourtm.tm_mon >= MONSPERYEAR) {
			yourtm.tm_mon = 0;
			if (increment_overflow32(&y, 1))
				goto out_of_range;
		}
	}
	if (increment_overflow32(&y, -TM_YEAR_BASE))
		goto out_of_range;
	if (! (INT_MIN <= y && y <= INT_MAX))
		goto out_of_range;
	yourtm.tm_year = (int)y;
	if (yourtm.tm_sec >= 0 && yourtm.tm_sec < SECSPERMIN)
		saved_seconds = 0;
	else if (y + TM_YEAR_BASE < EPOCH_YEAR) {
		/*
		** We can't set tm_sec to 0, because that might push the
		** time below the minimum representable time.
		** Set tm_sec to 59 instead.
		** This assumes that the minimum representable time is
		** not in the same minute that a leap second was deleted from,
		** which is a safer assumption than using 58 would be.
		*/
		if (increment_overflow(&yourtm.tm_sec, 1 - SECSPERMIN))
			goto out_of_range;
		saved_seconds = yourtm.tm_sec;
		yourtm.tm_sec = SECSPERMIN - 1;
	} else {
		saved_seconds = yourtm.tm_sec;
		yourtm.tm_sec = 0;
	}
	/*
	** Do a binary search (this works whatever time_t's type is).
	*/
	lo = TIME_T_MIN;
	hi = TIME_T_MAX;
#ifdef NO_ERROR_IN_DST_GAP
	ilo = lo;
#endif
	for ( ; ; ) {
		t = lo / 2 + hi / 2;
		if (t < lo)
			t = lo;
		else if (t > hi)
			t = hi;
		if (! funcp(sp, &t, offset, &mytm)) {
			/*
			** Assume that t is too extreme to be represented in
			** a struct tm; arrange things so that it is less
			** extreme on the next pass.
			*/
			dir = (t > 0) ? 1 : -1;
		} else	dir = tmcomp(&mytm, &yourtm);
		if (dir != 0) {
			if (t == lo) {
				if (t == TIME_T_MAX)
					goto out_of_range;
				++t;
				++lo;
			} else if (t == hi) {
				if (t == TIME_T_MIN)
					goto out_of_range;
				--t;
				--hi;
			}
#ifdef NO_ERROR_IN_DST_GAP
			if (ilo != lo && lo - 1 == hi && yourtm.tm_isdst < 0 &&
			    do_norm_secs) {
				for (i = sp->typecnt - 1; i >= 0; --i) {
					for (j = sp->typecnt - 1; j >= 0; --j) {
						time_t off;
						if (sp->ttis[j].tt_isdst ==
						    sp->ttis[i].tt_isdst)
							continue;
						off = sp->ttis[j].tt_utoff -
						    sp->ttis[i].tt_utoff;
						yourtm.tm_sec += off < 0 ?
						    -off : off;
						goto again;
					}
				}
			}
#endif
			if (lo > hi)
				goto invalid;
			if (dir > 0)
				hi = t;
			else	lo = t;
			continue;
		}
#if defined TM_GMTOFF && ! UNINIT_TRAP
		if (mytm.TM_GMTOFF != yourtm.TM_GMTOFF
		    && (yourtm.TM_GMTOFF < 0
			? (-SECSPERDAY <= yourtm.TM_GMTOFF
			   && (mytm.TM_GMTOFF <=
			       (/*CONSTCOND*/SMALLEST(INT_FAST32_MAX, LONG_MAX)
				+ yourtm.TM_GMTOFF)))
			: (yourtm.TM_GMTOFF <= SECSPERDAY
			   && ((/*CONSTCOND*/BIGGEST(INT_FAST32_MIN, LONG_MIN)
				+ yourtm.TM_GMTOFF)
			       <= mytm.TM_GMTOFF)))) {
		  /* MYTM matches YOURTM except with the wrong UT offset.
		     YOURTM.TM_GMTOFF is plausible, so try it instead.
		     It's OK if YOURTM.TM_GMTOFF contains uninitialized data,
		     since the guess gets checked.  */
		  time_t altt = t;
		  int_fast32_t diff = (int_fast32_t)
		      (mytm.TM_GMTOFF - yourtm.TM_GMTOFF);
		  if (!increment_overflow_time(&altt, diff)) {
		    struct tm alttm;
		    if (funcp(sp, &altt, offset, &alttm)
			&& alttm.tm_isdst == mytm.tm_isdst
			&& alttm.TM_GMTOFF == yourtm.TM_GMTOFF
			&& tmcomp(&alttm, &yourtm) == 0) {
		      t = altt;
		      mytm = alttm;
		    }
		  }
		}
#endif
		if (yourtm.tm_isdst < 0 || mytm.tm_isdst == yourtm.tm_isdst)
			break;
		/*
		** Right time, wrong type.
		** Hunt for right time, right type.
		** It's okay to guess wrong since the guess
		** gets checked.
		*/
		if (sp == NULL)
			goto invalid;
		for (i = sp->typecnt - 1; i >= 0; --i) {
			if (sp->ttis[i].tt_isdst != yourtm.tm_isdst)
				continue;
			for (j = sp->typecnt - 1; j >= 0; --j) {
				if (sp->ttis[j].tt_isdst == yourtm.tm_isdst)
					continue;
				newt = (time_t)(t + sp->ttis[j].tt_utoff -
				    sp->ttis[i].tt_utoff);
				if (! funcp(sp, &newt, offset, &mytm))
					continue;
				if (tmcomp(&mytm, &yourtm) != 0)
					continue;
				if (mytm.tm_isdst != yourtm.tm_isdst)
					continue;
				/*
				** We have a match.
				*/
				t = newt;
				goto label;
			}
		}
		goto invalid;
	}
label:
	newt = t + saved_seconds;
	if ((newt < t) != (saved_seconds < 0))
		goto out_of_range;
	t = newt;
	if (funcp(sp, &t, offset, tmp)) {
		*okayp = true;
		return t;
	}
out_of_range:
	errno = EOVERFLOW;
	return WRONG;
invalid:
	errno = EINVAL;
	return WRONG;
}

static time_t
time2(struct tm * const	tmp,
      struct tm *(*funcp)(struct state const *, time_t const *,
			  int_fast32_t, struct tm *),
      struct state const *sp,
      const int_fast32_t offset,
      bool *okayp)
{
	time_t	t;

	/*
	** First try without normalization of seconds
	** (in case tm_sec contains a value associated with a leap second).
	** If that fails, try with normalization of seconds.
	*/
	t = time2sub(tmp, funcp, sp, offset, okayp, false);
	return *okayp ? t : time2sub(tmp, funcp, sp, offset, okayp, true);
}

static time_t
time1(struct tm *const tmp,
      struct tm *(*funcp)(struct state const *, time_t const *,
			  int_fast32_t, struct tm *),
      struct state const *sp,
      const int_fast32_t offset)
{
	time_t			t;
	int			samei, otheri;
	int			sameind, otherind;
	int			i;
	int			nseen;
	int			save_errno;
	char				seen[TZ_MAX_TYPES];
	unsigned char			types[TZ_MAX_TYPES];
	bool				okay;

	if (tmp == NULL) {
		errno = EINVAL;
		return WRONG;
	}
	if (tmp->tm_isdst > 1)
		tmp->tm_isdst = 1;
	save_errno = errno;
	t = time2(tmp, funcp, sp, offset, &okay);
	if (okay) {
		errno = save_errno;
		return t;
	}
	if (tmp->tm_isdst < 0)
#ifdef PCTS
		/*
		** POSIX Conformance Test Suite code courtesy Grant Sullivan.
		*/
		tmp->tm_isdst = 0;	/* reset to std and try again */
#else
		return t;
#endif /* !defined PCTS */
	/*
	** We're supposed to assume that somebody took a time of one type
	** and did some math on it that yielded a "struct tm" that's bad.
	** We try to divine the type they started from and adjust to the
	** type they need.
	*/
	if (sp == NULL) {
		errno = EINVAL;
		return WRONG;
	}
	for (i = 0; i < sp->typecnt; ++i)
		seen[i] = false;
	nseen = 0;
	for (i = sp->timecnt - 1; i >= 0; --i)
		if (!seen[sp->types[i]]) {
			seen[sp->types[i]] = true;
			types[nseen++] = sp->types[i];
		}
	for (sameind = 0; sameind < nseen; ++sameind) {
		samei = types[sameind];
		if (sp->ttis[samei].tt_isdst != tmp->tm_isdst)
			continue;
		for (otherind = 0; otherind < nseen; ++otherind) {
			otheri = types[otherind];
			if (sp->ttis[otheri].tt_isdst == tmp->tm_isdst)
				continue;
			tmp->tm_sec += (int)(sp->ttis[otheri].tt_utoff -
					sp->ttis[samei].tt_utoff);
			tmp->tm_isdst = !tmp->tm_isdst;
			t = time2(tmp, funcp, sp, offset, &okay);
			if (okay) {
				errno = save_errno;
				return t;
			}
			tmp->tm_sec -= (int)(sp->ttis[otheri].tt_utoff -
					sp->ttis[samei].tt_utoff);
			tmp->tm_isdst = !tmp->tm_isdst;
		}
	}
	errno = EOVERFLOW;
	return WRONG;
}

static time_t
mktime_tzname(timezone_t sp, struct tm *tmp, bool setname)
{
	if (sp)
		return time1(tmp, localsub, sp, setname);
	else {
		gmtcheck();
		return time1(tmp, gmtsub, gmtptr, 0);
	}
}

#if NETBSD_INSPIRED

time_t
mktime_z(timezone_t sp, struct tm *const tmp)
{
	return mktime_tzname(sp, tmp, false);
}

#endif

time_t
mktime(struct tm *tmp)
{
	time_t t;

	rwlock_wrlock(&__lcl_lock);
	tzset_unlocked();
	t = mktime_tzname(__lclptr, tmp, true);
	rwlock_unlock(&__lcl_lock);
	return t;
}

#ifdef STD_INSPIRED

time_t
timelocal_z(const timezone_t sp, struct tm *const tmp)
{
	if (tmp != NULL)
		tmp->tm_isdst = -1;	/* in case it wasn't initialized */
	return mktime_z(sp, tmp);
}

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, (int_fast32_t)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;
}

/* NETBSD_INSPIRED_EXTERN functions are exported to callers if
   NETBSD_INSPIRED is defined, and are private otherwise.  */
#if NETBSD_INSPIRED
# define NETBSD_INSPIRED_EXTERN
#else
# define NETBSD_INSPIRED_EXTERN static
#endif


NETBSD_INSPIRED_EXTERN time_t
time2posix_z(timezone_t sp, time_t t)
{
	return (time_t)(t - leapcorr(sp, t));
}

time_t
time2posix(time_t t)
{
	rwlock_wrlock(&__lcl_lock);
	if (!lcl_is_set)
		tzset_unlocked();
	if (__lclptr)
		t = (time_t)(t - leapcorr(__lclptr, t));
	rwlock_unlock(&__lcl_lock);
	return t;
}

/*
** XXX--is the below the right way to conditionalize??
*/

#ifdef STD_INSPIRED

/*
** IEEE Std 1003.1 (POSIX) says that 536457599
** shall correspond to "Wed Dec 31 23:59:59 UTC 1986", which
** is not the case if we are accounting for leap seconds.
** So, we provide the following conversion routines for use
** when exchanging timestamps with POSIX conforming systems.
*/

NETBSD_INSPIRED_EXTERN time_t
posix2time_z(timezone_t sp, time_t t)
{
	time_t	x;
	time_t	y;
	/*
	** For a positive leap second hit, the result
	** is not unique. For a negative leap second
	** hit, the corresponding time doesn't exist,
	** so we return an adjacent second.
	*/
	x = (time_t)(t + leapcorr(sp, t));
	y = (time_t)(x - leapcorr(sp, x));
	if (y < t) {
		do {
			x++;
			y = (time_t)(x - leapcorr(sp, x));
		} while (y < t);
		x -= y != t;
	} else if (y > t) {
		do {
			--x;
			y = (time_t)(x - leapcorr(sp, x));
		} while (y > t);
		x += y != t;
	}
	return x;
}

time_t
posix2time(time_t t)
{
	rwlock_wrlock(&__lcl_lock);
	if (!lcl_is_set)
		tzset_unlocked();
	if (__lclptr)
		t = posix2time_z(__lclptr, t);
	rwlock_unlock(&__lcl_lock);
	return t;
}

#endif /* defined STD_INSPIRED */