tor-browser

zic.c (78664B)

---

/*
** This file is in the public domain, so clarified as of
** 2006-07-17 by Arthur David Olson.
*/

/* Enable extensions and modifications for ICU. */
#define ICU

/* Continue executing after link failure. Even if ICU is undefined
* (for vanilla zic behavior), ICU_LINKS should be defined, since zic
* appears to fail on the 2003 data the first time through during the
* linking phase. Running zic twice, with ICU_LINKS defined, causes
* links to be handled correctly. */
#define ICU_LINKS

#define LEAVE_SOME_PRE_2011_SYSTEMS_IN_THE_LURCH

#ifdef ICU
/* These constants are embedded in dynamically generated header
* version.h in the standard tzcode distribution. */
static char const PKGVERSION[]="N/A";
static char const TZVERSION[]="N/A";
static char const REPORT_BUGS_TO[]="N/A";
#else
#include "version.h"
#endif
#include "private.h"
#include "locale.h"
#include "tzfile.h"

#include <stdarg.h>
#include <stdbool.h>

#define	ZIC_VERSION_PRE_2013 '2'
#define	ZIC_VERSION	'3'

typedef int_fast64_t	zic_t;
#define ZIC_MIN INT_FAST64_MIN
#define ZIC_MAX INT_FAST64_MAX
#define SCNdZIC SCNdFAST64

#ifndef ZIC_MAX_ABBR_LEN_WO_WARN
#define ZIC_MAX_ABBR_LEN_WO_WARN	6
#endif /* !defined ZIC_MAX_ABBR_LEN_WO_WARN */

#if HAVE_SYS_STAT_H
#include "sys/stat.h"
#endif
#ifdef S_IRUSR
#define MKDIR_UMASK (S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH)
#else
#define MKDIR_UMASK 0755
#endif

#ifdef ICU
#include "tz2icu.h"
#endif

/*
** On some ancient hosts, predicates like `isspace(C)' are defined
** only if isascii(C) || C == EOF. Modern hosts obey the C Standard,
** which says they are defined only if C == ((unsigned char) C) || C == EOF.
** Neither the C Standard nor Posix require that `isascii' exist.
** For portability, we check both ancient and modern requirements.
** If isascii is not defined, the isascii check succeeds trivially.
*/
#include "ctype.h"
#ifndef isascii
#define isascii(x) 1
#endif

#define end(cp)	(strchr((cp), '\0'))

struct rule {
const char *	r_filename;
int		r_linenum;
const char *	r_name;

zic_t		r_loyear;	/* for example, 1986 */
zic_t		r_hiyear;	/* for example, 1986 */
const char *	r_yrtype;
int		r_lowasnum;
int		r_hiwasnum;

int		r_month;	/* 0..11 */

int		r_dycode;	/* see below */
int		r_dayofmonth;
int		r_wday;

zic_t		r_tod;		/* time from midnight */
int		r_todisstd;	/* above is standard time if true */
				/* or wall clock time if false */
int		r_todisgmt;	/* above is GMT if true */
				/* or local time if false */
zic_t		r_stdoff;	/* offset from standard time */
const char *	r_abbrvar;	/* variable part of abbreviation */

int		r_todo;		/* a rule to do (used in outzone) */
zic_t		r_temp;		/* used in outzone */
};

/*
**	r_dycode		r_dayofmonth	r_wday
*/

#define DC_DOM		0	/* 1..31 */	/* unused */
#define DC_DOWGEQ	1	/* 1..31 */	/* 0..6 (Sun..Sat) */
#define DC_DOWLEQ	2	/* 1..31 */	/* 0..6 (Sun..Sat) */

struct zone {
const char *	z_filename;
int		z_linenum;

const char *	z_name;
zic_t		z_gmtoff;
const char *	z_rule;
const char *	z_format;

zic_t		z_stdoff;

struct rule *	z_rules;
int		z_nrules;

struct rule	z_untilrule;
zic_t		z_untiltime;
};

extern int	getopt(int argc, char * const argv[],
		const char * options);
extern int	link(const char * fromname, const char * toname);
extern char *	optarg;
extern int	optind;

#if ! HAVE_LINK
# define link(from, to) (-1)
#endif
#if ! HAVE_SYMLINK
# define symlink(from, to) (-1)
#endif

static void	addtt(zic_t starttime, int type);
#ifdef ICU
static int	addtype(const zic_t gmtoff, const zic_t rawoff, const zic_t dstoff,
			char *const abbr, int isdst,
			int ttisstd, int ttisgmt);
#else
static int	addtype(zic_t gmtoff, const char * abbr, int isdst,
			int ttisstd, int ttisgmt);
#endif
static void	leapadd(zic_t t, int positive, int rolling, int count);
static void	adjleap(void);
static void	associate(void);
static void	dolink(const char * fromfield, const char * tofield);
static char **	getfields(char * buf);
static zic_t	gethms(const char * string, const char * errstrng,
	       int signable);
static void	infile(const char * filename);
static void	inleap(char ** fields, int nfields);
static void	inlink(char ** fields, int nfields);
static void	inrule(char ** fields, int nfields);
static int	inzcont(char ** fields, int nfields);
static int	inzone(char ** fields, int nfields);
static int	inzsub(char ** fields, int nfields, int iscont);
static int	itsdir(const char * name);
static int	lowerit(int c);
static int	mkdirs(char * filename);
static void	newabbr(const char * abbr);
static zic_t	oadd(zic_t t1, zic_t t2);
static void	outzone(const struct zone * zp, int ntzones);
static zic_t	rpytime(const struct rule * rp, zic_t wantedy);
static void	rulesub(struct rule * rp,
		const char * loyearp, const char * hiyearp,
		const char * typep, const char * monthp,
		const char * dayp, const char * timep);
static zic_t	tadd(zic_t t1, zic_t t2);
static int	yearistype(int year, const char * type);
#ifdef ICU
static void	emit_icu_zone(FILE* f, const char* zoneName, int zoneOffset,
				const struct rule* rule,
				int ruleIndex, int startYear);
static void	emit_icu_link(FILE* f, const char* from, const char* to);
static void	emit_icu_rule(FILE* f, const struct rule* r, int ruleIndex);
static int	add_icu_final_rules(const struct rule* r1, const struct rule* r2);
#endif

static int		charcnt;
static int		errors;
static const char *	filename;
static int		leapcnt;
static int		leapseen;
static zic_t		leapminyear;
static zic_t		leapmaxyear;
static int		linenum;
static int		max_abbrvar_len;
static int		max_format_len;
static zic_t		max_year;
static zic_t		min_year;
static int		noise;
static const char *	rfilename;
static int		rlinenum;
static const char *	progname;
static int		timecnt;
static int		timecnt_alloc;
static int		typecnt;

/*
** Line codes.
*/

#define LC_RULE		0
#define LC_ZONE		1
#define LC_LINK		2
#define LC_LEAP		3

/*
** Which fields are which on a Zone line.
*/

#define ZF_NAME		1
#define ZF_GMTOFF	2
#define ZF_RULE		3
#define ZF_FORMAT	4
#define ZF_TILYEAR	5
#define ZF_TILMONTH	6
#define ZF_TILDAY	7
#define ZF_TILTIME	8
#define ZONE_MINFIELDS	5
#define ZONE_MAXFIELDS	9

/*
** Which fields are which on a Zone continuation line.
*/

#define ZFC_GMTOFF	0
#define ZFC_RULE	1
#define ZFC_FORMAT	2
#define ZFC_TILYEAR	3
#define ZFC_TILMONTH	4
#define ZFC_TILDAY	5
#define ZFC_TILTIME	6
#define ZONEC_MINFIELDS	3
#define ZONEC_MAXFIELDS	7

/*
** Which files are which on a Rule line.
*/

#define RF_NAME		1
#define RF_LOYEAR	2
#define RF_HIYEAR	3
#define RF_COMMAND	4
#define RF_MONTH	5
#define RF_DAY		6
#define RF_TOD		7
#define RF_STDOFF	8
#define RF_ABBRVAR	9
#define RULE_FIELDS	10

/*
** Which fields are which on a Link line.
*/

#define LF_FROM		1
#define LF_TO		2
#define LINK_FIELDS	3

/*
** Which fields are which on a Leap line.
*/

#define LP_YEAR		1
#define LP_MONTH	2
#define LP_DAY		3
#define LP_TIME		4
#define LP_CORR		5
#define LP_ROLL		6
#define LEAP_FIELDS	7

/*
** Year synonyms.
*/

#define YR_MINIMUM	0
#define YR_MAXIMUM	1
#define YR_ONLY		2

static struct rule *	rules;
static int		nrules;	/* number of rules */
static int		nrules_alloc;

static struct zone *	zones;
static int		nzones;	/* number of zones */
static int		nzones_alloc;

struct link {
const char *	l_filename;
int		l_linenum;
const char *	l_from;
const char *	l_to;
};

static struct link *	links;
static int		nlinks;
static int		nlinks_alloc;

struct lookup {
const char *	l_word;
const int	l_value;
};

#ifdef ICU
/* Indices into rules[] for final rules.  They will occur in pairs,
* with finalRules[i] occurring before finalRules[i+1] in the year.
* Each zone need only store a start year, a standard offset, and an
* index into finalRules[].  FinalRules[] are aliases into rules[]. */
static const struct rule **	finalRules = NULL;
static int					finalRulesCount = 0;
#endif

static struct lookup const *	byword(const char * string,
				const struct lookup * lp);

static struct lookup const	line_codes[] = {
{ "Rule",	LC_RULE },
{ "Zone",	LC_ZONE },
{ "Link",	LC_LINK },
{ "Leap",	LC_LEAP },
{ NULL,		0}
};

static struct lookup const	mon_names[] = {
{ "January",	TM_JANUARY },
{ "February",	TM_FEBRUARY },
{ "March",	TM_MARCH },
{ "April",	TM_APRIL },
{ "May",	TM_MAY },
{ "June",	TM_JUNE },
{ "July",	TM_JULY },
{ "August",	TM_AUGUST },
{ "September",	TM_SEPTEMBER },
{ "October",	TM_OCTOBER },
{ "November",	TM_NOVEMBER },
{ "December",	TM_DECEMBER },
{ NULL,		0 }
};

static struct lookup const	wday_names[] = {
{ "Sunday",	TM_SUNDAY },
{ "Monday",	TM_MONDAY },
{ "Tuesday",	TM_TUESDAY },
{ "Wednesday",	TM_WEDNESDAY },
{ "Thursday",	TM_THURSDAY },
{ "Friday",	TM_FRIDAY },
{ "Saturday",	TM_SATURDAY },
{ NULL,		0 }
};

static struct lookup const	lasts[] = {
{ "last-Sunday",	TM_SUNDAY },
{ "last-Monday",	TM_MONDAY },
{ "last-Tuesday",	TM_TUESDAY },
{ "last-Wednesday",	TM_WEDNESDAY },
{ "last-Thursday",	TM_THURSDAY },
{ "last-Friday",	TM_FRIDAY },
{ "last-Saturday",	TM_SATURDAY },
{ NULL,			0 }
};

static struct lookup const	begin_years[] = {
{ "minimum",	YR_MINIMUM },
{ "maximum",	YR_MAXIMUM },
{ NULL,		0 }
};

static struct lookup const	end_years[] = {
{ "minimum",	YR_MINIMUM },
{ "maximum",	YR_MAXIMUM },
{ "only",	YR_ONLY },
{ NULL,		0 }
};

static struct lookup const	leap_types[] = {
{ "Rolling",	true },
{ "Stationary",	false },
{ NULL,		0 }
};

static const int	len_months[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	len_years[2] = {
DAYSPERNYEAR, DAYSPERLYEAR
};

static struct attype {
zic_t		at;
unsigned char	type;
} *			attypes;
static zic_t		gmtoffs[TZ_MAX_TYPES];
#ifdef ICU
/* gmtoffs[i] = rawoffs[i] + dstoffs[i] */
static zic_t		rawoffs[TZ_MAX_TYPES];
static zic_t		dstoffs[TZ_MAX_TYPES];
#endif
static char		isdsts[TZ_MAX_TYPES];
static unsigned char	abbrinds[TZ_MAX_TYPES];
static char		ttisstds[TZ_MAX_TYPES];
static char		ttisgmts[TZ_MAX_TYPES];
static char		chars[TZ_MAX_CHARS];
static zic_t		trans[TZ_MAX_LEAPS];
static zic_t		corr[TZ_MAX_LEAPS];
static char		roll[TZ_MAX_LEAPS];

/*
** Memory allocation.
*/

static _Noreturn void
memory_exhausted(const char *msg)
{
fprintf(stderr, _("%s: Memory exhausted: %s\n"), progname, msg);
exit(EXIT_FAILURE);
}

static ATTRIBUTE_PURE size_t
size_product(size_t nitems, size_t itemsize)
{
if (SIZE_MAX / itemsize < nitems)
	memory_exhausted("size overflow");
return nitems * itemsize;
}

static ATTRIBUTE_PURE void *
memcheck(void *const ptr)
{
if (ptr == NULL)
	memory_exhausted(strerror(errno));
return ptr;
}

#define emalloc(size)		memcheck(malloc(size))
#define erealloc(ptr, size)	memcheck(realloc(ptr, size))
#define ecpyalloc(ptr)		memcheck(icpyalloc(ptr))
#define ecatalloc(oldp, newp)	memcheck(icatalloc((oldp), (newp)))

static void *
growalloc(void *ptr, size_t itemsize, int nitems, int *nitems_alloc)
{
if (nitems < *nitems_alloc)
	return ptr;
else {
	int amax = INT_MAX < SIZE_MAX ? INT_MAX : SIZE_MAX;
	if ((amax - 1) / 3 * 2 < *nitems_alloc)
		memory_exhausted("int overflow");
	*nitems_alloc = *nitems_alloc + (*nitems_alloc >> 1) + 1;
	return erealloc(ptr, size_product(*nitems_alloc, itemsize));
}
}

/*
** Error handling.
*/

static void
eats(const char *const name, const int num, const char *const rname,
    const int rnum)
{
filename = name;
linenum = num;
rfilename = rname;
rlinenum = rnum;
}

static void
eat(const char *const name, const int num)
{
eats(name, num, NULL, -1);
}

static void ATTRIBUTE_FORMAT((printf, 1, 0))
verror(const char *const string, va_list args)
{
/*
** Match the format of "cc" to allow sh users to
**	zic ... 2>&1 | error -t "*" -v
** on BSD systems.
*/
fprintf(stderr, _("\"%s\", line %d: "), filename, linenum);
vfprintf(stderr, string, args);
if (rfilename != NULL)
	(void) fprintf(stderr, _(" (rule from \"%s\", line %d)"),
		rfilename, rlinenum);
(void) fprintf(stderr, "\n");
++errors;
}

static void ATTRIBUTE_FORMAT((printf, 1, 2))
error(const char *const string, ...)
{
va_list args;
va_start(args, string);
verror(string, args);
va_end(args);
}

static void ATTRIBUTE_FORMAT((printf, 1, 2))
warning(const char *const string, ...)
{
va_list args;
fprintf(stderr, _("warning: "));
va_start(args, string);
verror(string, args);
va_end(args);
--errors;
}

static _Noreturn void
usage(FILE *stream, int status)
{
(void) fprintf(stream, _("%s: usage is %s \
[ --version ] [ --help ] [ -v ] [ -l localtime ] [ -p posixrules ] \\\n\
\t[ -d directory ] [ -L leapseconds ] [ -y yearistype ] [ filename ... ]\n\
\n\
Report bugs to %s.\n"),
	       progname, progname, REPORT_BUGS_TO);
exit(status);
}

#ifdef ICU
/* File into which we will write supplemental ICU data. */
static FILE *	icuFile;

static void
emit_icu_zone(FILE* f, const char* zoneName, int zoneOffset,
				const struct rule* rule,
				int ruleIndex, int startYear) {
/* machine-readable section */
fprintf(f, "zone %s %d %d %s", zoneName, zoneOffset, startYear, rule->r_name);

/* human-readable section */
fprintf(f, " # zone %s, offset %d, year >= %d, rule %s (%d)\n",
		zoneName, zoneOffset, startYear,
		rule->r_name, ruleIndex);
}

static void
emit_icu_link(FILE* f, const char* from, const char* to) {
/* machine-readable section */
fprintf(f, "link %s %s\n", from, to);
}

static const char* DYCODE[] = {"DOM", "DOWGEQ", "DOWLEQ"};

static void
emit_icu_rule(FILE* f, const struct rule* r, int ruleIndex) {
if (r->r_yrtype != NULL) {
	warning("year types not supported by ICU");
	fprintf(stderr, "rule %s, file %s, line %d\n",
			r->r_name, r->r_filename, r->r_linenum);
   }

/* machine-readable section */
fprintf(f, "rule %s %s %d %d %d %lld %d %d %lld",
		r->r_name, DYCODE[r->r_dycode],
		r->r_month, r->r_dayofmonth,
		(r->r_dycode == DC_DOM ? -1 : r->r_wday),
		r->r_tod, r->r_todisstd, r->r_todisgmt, r->r_stdoff
		);

/* human-readable section */
fprintf(f, " # %d: %s, file %s, line %d",
		ruleIndex, r->r_name, r->r_filename, r->r_linenum);
fprintf(f, ", mode %s", DYCODE[r->r_dycode]);
fprintf(f, ", %s, dom %d", mon_names[r->r_month].l_word, r->r_dayofmonth);
if (r->r_dycode != DC_DOM) {
	fprintf(f, ", %s", wday_names[r->r_wday].l_word);
}
fprintf(f, ", time %lld", r->r_tod);
fprintf(f, ", isstd %d", r->r_todisstd);
fprintf(f, ", isgmt %d", r->r_todisgmt);
fprintf(f, ", offset %lld", r->r_stdoff);
fprintf(f, "\n");
}

static int
add_icu_final_rules(const struct rule* r1, const struct rule* r2) {
int i;

for (i=0; i<finalRulesCount; ++i) { /* i+=2 should work too */
	if (r1==finalRules[i]) return i; /* [sic] pointer comparison */
}

finalRules = (const struct rule**) (void*) erealloc((char *) finalRules,
			(finalRulesCount + 2) * sizeof(*finalRules));
finalRules[finalRulesCount++] = r1;
finalRules[finalRulesCount++] = r2;
return finalRulesCount - 2;
}
#endif

static const char *	psxrules;
static const char *	lcltime;
static const char *	directory;
static const char *	leapsec;
static const char *	yitcommand;

int
main(int argc, char **argv)
{
register int	i;
register int	j;
register int	c;

#ifdef S_IWGRP
(void) umask(umask(S_IWGRP | S_IWOTH) | (S_IWGRP | S_IWOTH));
#endif
#if HAVE_GETTEXT
(void) setlocale(LC_ALL, "");
#ifdef TZ_DOMAINDIR
(void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR);
#endif /* defined TEXTDOMAINDIR */
(void) textdomain(TZ_DOMAIN);
#endif /* HAVE_GETTEXT */
progname = argv[0];
if (TYPE_BIT(zic_t) < 64) {
	(void) fprintf(stderr, "%s: %s\n", progname,
		_("wild compilation-time specification of zic_t"));
	exit(EXIT_FAILURE);
}
for (i = 1; i < argc; ++i)
	if (strcmp(argv[i], "--version") == 0) {
		(void) printf("zic %s%s\n", PKGVERSION, TZVERSION);
		exit(EXIT_SUCCESS);
	} else if (strcmp(argv[i], "--help") == 0) {
		usage(stdout, EXIT_SUCCESS);
	}
while ((c = getopt(argc, argv, "d:l:p:L:vsy:")) != EOF && c != -1)
	switch (c) {
		default:
			usage(stderr, EXIT_FAILURE);
		case 'd':
			if (directory == NULL)
				directory = optarg;
			else {
				(void) fprintf(stderr,
_("%s: More than one -d option specified\n"),
					progname);
				exit(EXIT_FAILURE);
			}
			break;
		case 'l':
			if (lcltime == NULL)
				lcltime = optarg;
			else {
				(void) fprintf(stderr,
_("%s: More than one -l option specified\n"),
					progname);
				exit(EXIT_FAILURE);
			}
			break;
		case 'p':
			if (psxrules == NULL)
				psxrules = optarg;
			else {
				(void) fprintf(stderr,
_("%s: More than one -p option specified\n"),
					progname);
				exit(EXIT_FAILURE);
			}
			break;
		case 'y':
			if (yitcommand == NULL)
				yitcommand = optarg;
			else {
				(void) fprintf(stderr,
_("%s: More than one -y option specified\n"),
					progname);
				exit(EXIT_FAILURE);
			}
			break;
		case 'L':
			if (leapsec == NULL)
				leapsec = optarg;
			else {
				(void) fprintf(stderr,
_("%s: More than one -L option specified\n"),
					progname);
				exit(EXIT_FAILURE);
			}
			break;
		case 'v':
			noise = true;
			break;
		case 's':
			(void) printf("%s: -s ignored\n", progname);
			break;
	}
if (optind == argc - 1 && strcmp(argv[optind], "=") == 0)
	usage(stderr, EXIT_FAILURE);	/* usage message by request */
if (directory == NULL)
	directory = TZDIR;
if (yitcommand == NULL)
	yitcommand = "yearistype";

if (optind < argc && leapsec != NULL) {
	infile(leapsec);
	adjleap();
}

#ifdef ICU
if ((icuFile = fopen(ICU_ZONE_FILE, "w")) == NULL) {
	const char *e = strerror(errno);
	(void) fprintf(stderr, _("%s: Can't open %s: %s\n"),
					progname, ICU_ZONE_FILE, e);
	(void) exit(EXIT_FAILURE);
}
#endif
for (i = optind; i < argc; ++i)
	infile(argv[i]);
if (errors)
	exit(EXIT_FAILURE);
associate();
for (i = 0; i < nzones; i = j) {
	/*
	** Find the next non-continuation zone entry.
	*/
	for (j = i + 1; j < nzones && zones[j].z_name == NULL; ++j)
		continue;
	outzone(&zones[i], j - i);
}
/*
** Make links.
*/
for (i = 0; i < nlinks; ++i) {
	eat(links[i].l_filename, links[i].l_linenum);
	dolink(links[i].l_from, links[i].l_to);
#ifdef ICU
	emit_icu_link(icuFile, links[i].l_from, links[i].l_to);
#endif
	if (noise)
		for (j = 0; j < nlinks; ++j)
			if (strcmp(links[i].l_to,
				links[j].l_from) == 0)
					warning(_("link to link"));
}
if (lcltime != NULL) {
	eat("command line", 1);
	dolink(lcltime, TZDEFAULT);
}
if (psxrules != NULL) {
	eat("command line", 1);
	dolink(psxrules, TZDEFRULES);
}
#ifdef ICU
for (i=0; i<finalRulesCount; ++i) {
	emit_icu_rule(icuFile, finalRules[i], i);
}
#endif /*ICU*/
return (errors == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
}

static void
dolink(const char *const fromfield, const char *const tofield)
{
register char *	fromname;
register char *	toname;

if (fromfield[0] == '/')
	fromname = ecpyalloc(fromfield);
else {
	fromname = ecpyalloc(directory);
	fromname = ecatalloc(fromname, "/");
	fromname = ecatalloc(fromname, fromfield);
}
if (tofield[0] == '/')
	toname = ecpyalloc(tofield);
else {
	toname = ecpyalloc(directory);
	toname = ecatalloc(toname, "/");
	toname = ecatalloc(toname, tofield);
}
/*
** We get to be careful here since
** there's a fair chance of root running us.
*/
if (!itsdir(toname))
	(void) remove(toname);
if (link(fromname, toname) != 0
    && access(fromname, F_OK) == 0 && !itsdir(fromname)) {
	int	result;

	if (mkdirs(toname) != 0)
		exit(EXIT_FAILURE);

	result = link(fromname, toname);
	if (result != 0) {
			const char *s = fromfield;
			const char *t;
			register char * symlinkcontents = NULL;

			do
				 t = s;
			while ((s = strchr(s, '/'))
			       && ! strncmp (fromfield, tofield,
					     ++s - fromfield));

			for (s = tofield + (t - fromfield);
			     (s = strchr(s, '/'));
			     s++)
				symlinkcontents =
					ecatalloc(symlinkcontents,
					"../");
			symlinkcontents = ecatalloc(symlinkcontents, t);
			result = symlink(symlinkcontents, toname);
			if (result == 0)
warning(_("hard link failed, symbolic link used"));
			free(symlinkcontents);
	}
	if (result != 0) {
		FILE *fp, *tp;
		int c;
		fp = fopen(fromname, "rb");
		if (!fp) {
			const char *e = strerror(errno);
			(void) fprintf(stderr,
				       _("%s: Can't read %s: %s\n"),
				       progname, fromname, e);
			exit(EXIT_FAILURE);
		}
		tp = fopen(toname, "wb");
		if (!tp) {
			const char *e = strerror(errno);
			(void) fprintf(stderr,
				       _("%s: Can't create %s: %s\n"),
				       progname, toname, e);
			exit(EXIT_FAILURE);
		}
		while ((c = getc(fp)) != EOF)
			putc(c, tp);
		if (ferror(fp) || fclose(fp)) {
			(void) fprintf(stderr,
				       _("%s: Error reading %s\n"),
				       progname, fromname);
			exit(EXIT_FAILURE);
		}
		if (ferror(tp) || fclose(tp)) {
			(void) fprintf(stderr,
				       _("%s: Error writing %s\n"),
				       progname, toname);
			exit(EXIT_FAILURE);
		}
		warning(_("link failed, copy used"));
#ifndef ICU_LINKS
		exit(EXIT_FAILURE);
#endif
	}
}
free(fromname);
free(toname);
}

#define TIME_T_BITS_IN_FILE	64

static const zic_t min_time = (zic_t) -1 << (TIME_T_BITS_IN_FILE - 1);
static const zic_t max_time = -1 - ((zic_t) -1 << (TIME_T_BITS_IN_FILE - 1));

static int
itsdir(const char *const name)
{
register char *	myname;
register int	accres;

myname = ecpyalloc(name);
myname = ecatalloc(myname, "/.");
accres = access(myname, F_OK);
free(myname);
return accres == 0;
}

/*
** Associate sets of rules with zones.
*/

/*
** Sort by rule name.
*/

static int
rcomp(const void *cp1, const void *cp2)
{
return strcmp(((const struct rule *) cp1)->r_name,
	((const struct rule *) cp2)->r_name);
}

static void
associate(void)
{
register struct zone *	zp;
register struct rule *	rp;
register int		base, out;
register int		i, j;

if (nrules != 0) {
	(void) qsort(rules, nrules, sizeof *rules, rcomp);
	for (i = 0; i < nrules - 1; ++i) {
		if (strcmp(rules[i].r_name,
			rules[i + 1].r_name) != 0)
				continue;
		if (strcmp(rules[i].r_filename,
			rules[i + 1].r_filename) == 0)
				continue;
		eat(rules[i].r_filename, rules[i].r_linenum);
		warning(_("same rule name in multiple files"));
		eat(rules[i + 1].r_filename, rules[i + 1].r_linenum);
		warning(_("same rule name in multiple files"));
		for (j = i + 2; j < nrules; ++j) {
			if (strcmp(rules[i].r_name,
				rules[j].r_name) != 0)
					break;
			if (strcmp(rules[i].r_filename,
				rules[j].r_filename) == 0)
					continue;
			if (strcmp(rules[i + 1].r_filename,
				rules[j].r_filename) == 0)
					continue;
			break;
		}
		i = j - 1;
	}
}
for (i = 0; i < nzones; ++i) {
	zp = &zones[i];
	zp->z_rules = NULL;
	zp->z_nrules = 0;
}
for (base = 0; base < nrules; base = out) {
	rp = &rules[base];
	for (out = base + 1; out < nrules; ++out)
		if (strcmp(rp->r_name, rules[out].r_name) != 0)
			break;
	for (i = 0; i < nzones; ++i) {
		zp = &zones[i];
		if (strcmp(zp->z_rule, rp->r_name) != 0)
			continue;
		zp->z_rules = rp;
		zp->z_nrules = out - base;
	}
}
for (i = 0; i < nzones; ++i) {
	zp = &zones[i];
	if (zp->z_nrules == 0) {
		/*
		** Maybe we have a local standard time offset.
		*/
		eat(zp->z_filename, zp->z_linenum);
		zp->z_stdoff = gethms(zp->z_rule, _("unruly zone"),
			true);
		/*
		** Note, though, that if there's no rule,
		** a '%s' in the format is a bad thing.
		*/
		if (strchr(zp->z_format, '%') != 0)
			error("%s", _("%s in ruleless zone"));
	}
}
if (errors)
	exit(EXIT_FAILURE);
}

static void
infile(const char *name)
{
register FILE *			fp;
register char **		fields;
register char *			cp;
register const struct lookup *	lp;
register int			nfields;
register int			wantcont;
register int			num;
char				buf[BUFSIZ];

if (strcmp(name, "-") == 0) {
	name = _("standard input");
	fp = stdin;
} else if ((fp = fopen(name, "r")) == NULL) {
	const char *e = strerror(errno);

	(void) fprintf(stderr, _("%s: Can't open %s: %s\n"),
		progname, name, e);
	exit(EXIT_FAILURE);
}
wantcont = false;
for (num = 1; ; ++num) {
	eat(name, num);
	if (fgets(buf, sizeof buf, fp) != buf)
		break;
	cp = strchr(buf, '\n');
	if (cp == NULL) {
		error(_("line too long"));
		exit(EXIT_FAILURE);
	}
	*cp = '\0';
	fields = getfields(buf);
	nfields = 0;
	while (fields[nfields] != NULL) {
		static char	nada;

		if (strcmp(fields[nfields], "-") == 0)
			fields[nfields] = &nada;
		++nfields;
	}
	if (nfields == 0) {
		/* nothing to do */
	} else if (wantcont) {
		wantcont = inzcont(fields, nfields);
	} else {
		lp = byword(fields[0], line_codes);
		if (lp == NULL)
			error(_("input line of unknown type"));
		else switch ((int) (lp->l_value)) {
			case LC_RULE:
				inrule(fields, nfields);
				wantcont = false;
				break;
			case LC_ZONE:
				wantcont = inzone(fields, nfields);
				break;
			case LC_LINK:
				inlink(fields, nfields);
				wantcont = false;
				break;
			case LC_LEAP:
				if (name != leapsec)
					(void) fprintf(stderr,
_("%s: Leap line in non leap seconds file %s\n"),
						progname, name);
				else	inleap(fields, nfields);
				wantcont = false;
				break;
			default:	/* "cannot happen" */
				(void) fprintf(stderr,
_("%s: panic: Invalid l_value %d\n"),
					progname, lp->l_value);
				exit(EXIT_FAILURE);
		}
	}
	free(fields);
}
if (ferror(fp)) {
	(void) fprintf(stderr, _("%s: Error reading %s\n"),
		progname, filename);
	exit(EXIT_FAILURE);
}
if (fp != stdin && fclose(fp)) {
	const char *e = strerror(errno);

	(void) fprintf(stderr, _("%s: Error closing %s: %s\n"),
		progname, filename, e);
	exit(EXIT_FAILURE);
}
if (wantcont)
	error(_("expected continuation line not found"));
}

/*
** Convert a string of one of the forms
**	h	-h	hh:mm	-hh:mm	hh:mm:ss	-hh:mm:ss
** into a number of seconds.
** A null string maps to zero.
** Call error with errstring and return zero on errors.
*/

static zic_t
gethms(const char *string, const char *const errstring, const int signable)
{
zic_t	hh;
int	mm, ss, sign;

if (string == NULL || *string == '\0')
	return 0;
if (!signable)
	sign = 1;
else if (*string == '-') {
	sign = -1;
	++string;
} else	sign = 1;
if (sscanf(string, scheck(string, "%"SCNdZIC), &hh) == 1)
	mm = ss = 0;
else if (sscanf(string, scheck(string, "%"SCNdZIC":%d"), &hh, &mm) == 2)
	ss = 0;
else if (sscanf(string, scheck(string, "%"SCNdZIC":%d:%d"),
	&hh, &mm, &ss) != 3) {
		error("%s", errstring);
		return 0;
}
if (hh < 0 ||
	mm < 0 || mm >= MINSPERHOUR ||
	ss < 0 || ss > SECSPERMIN) {
		error("%s", errstring);
		return 0;
}
if (ZIC_MAX / SECSPERHOUR < hh) {
	error(_("time overflow"));
	return 0;
}
if (noise && hh == HOURSPERDAY && mm == 0 && ss == 0)
	warning(_("24:00 not handled by pre-1998 versions of zic"));
if (noise && (hh > HOURSPERDAY ||
	(hh == HOURSPERDAY && (mm != 0 || ss != 0))))
warning(_("values over 24 hours not handled by pre-2007 versions of zic"));
return oadd(sign * hh * SECSPERHOUR,
	    sign * (mm * SECSPERMIN + ss));
}

static void
inrule(register char **const fields, const int nfields)
{
static struct rule	r;

if (nfields != RULE_FIELDS) {
	error(_("wrong number of fields on Rule line"));
	return;
}
if (*fields[RF_NAME] == '\0') {
	error(_("nameless rule"));
	return;
}
r.r_filename = filename;
r.r_linenum = linenum;
r.r_stdoff = gethms(fields[RF_STDOFF], _("invalid saved time"), true);
rulesub(&r, fields[RF_LOYEAR], fields[RF_HIYEAR], fields[RF_COMMAND],
	fields[RF_MONTH], fields[RF_DAY], fields[RF_TOD]);
r.r_name = ecpyalloc(fields[RF_NAME]);
r.r_abbrvar = ecpyalloc(fields[RF_ABBRVAR]);
if (max_abbrvar_len < strlen(r.r_abbrvar))
	max_abbrvar_len = strlen(r.r_abbrvar);
rules = growalloc(rules, sizeof *rules, nrules, &nrules_alloc);
rules[nrules++] = r;
}

static int
inzone(register char **const fields, const int nfields)
{
register int	i;

if (nfields < ZONE_MINFIELDS || nfields > ZONE_MAXFIELDS) {
	error(_("wrong number of fields on Zone line"));
	return false;
}
if (strcmp(fields[ZF_NAME], TZDEFAULT) == 0 && lcltime != NULL) {
	error(
_("\"Zone %s\" line and -l option are mutually exclusive"),
		TZDEFAULT);
	return false;
}
if (strcmp(fields[ZF_NAME], TZDEFRULES) == 0 && psxrules != NULL) {
	error(
_("\"Zone %s\" line and -p option are mutually exclusive"),
		TZDEFRULES);
	return false;
}
for (i = 0; i < nzones; ++i)
	if (zones[i].z_name != NULL &&
		strcmp(zones[i].z_name, fields[ZF_NAME]) == 0) {
			error(
_("duplicate zone name %s (file \"%s\", line %d)"),
				fields[ZF_NAME],
				zones[i].z_filename,
				zones[i].z_linenum);
			return false;
	}
return inzsub(fields, nfields, false);
}

static int
inzcont(register char **const fields, const int nfields)
{
if (nfields < ZONEC_MINFIELDS || nfields > ZONEC_MAXFIELDS) {
	error(_("wrong number of fields on Zone continuation line"));
	return false;
}
return inzsub(fields, nfields, true);
}

static int
inzsub(register char **const fields, const int nfields, const int iscont)
{
register char *		cp;
static struct zone	z;
register int		i_gmtoff, i_rule, i_format;
register int		i_untilyear, i_untilmonth;
register int		i_untilday, i_untiltime;
register int		hasuntil;

if (iscont) {
	i_gmtoff = ZFC_GMTOFF;
	i_rule = ZFC_RULE;
	i_format = ZFC_FORMAT;
	i_untilyear = ZFC_TILYEAR;
	i_untilmonth = ZFC_TILMONTH;
	i_untilday = ZFC_TILDAY;
	i_untiltime = ZFC_TILTIME;
	z.z_name = NULL;
} else {
	i_gmtoff = ZF_GMTOFF;
	i_rule = ZF_RULE;
	i_format = ZF_FORMAT;
	i_untilyear = ZF_TILYEAR;
	i_untilmonth = ZF_TILMONTH;
	i_untilday = ZF_TILDAY;
	i_untiltime = ZF_TILTIME;
	z.z_name = ecpyalloc(fields[ZF_NAME]);
}
z.z_filename = filename;
z.z_linenum = linenum;
z.z_gmtoff = gethms(fields[i_gmtoff], _("invalid UT offset"), true);
if ((cp = strchr(fields[i_format], '%')) != 0) {
	if (*++cp != 's' || strchr(cp, '%') != 0) {
		error(_("invalid abbreviation format"));
		return false;
	}
}
z.z_rule = ecpyalloc(fields[i_rule]);
z.z_format = ecpyalloc(fields[i_format]);
if (max_format_len < strlen(z.z_format))
	max_format_len = strlen(z.z_format);
hasuntil = nfields > i_untilyear;
if (hasuntil) {
	z.z_untilrule.r_filename = filename;
	z.z_untilrule.r_linenum = linenum;
	rulesub(&z.z_untilrule,
		fields[i_untilyear],
		"only",
		"",
		(nfields > i_untilmonth) ?
		fields[i_untilmonth] : "Jan",
		(nfields > i_untilday) ? fields[i_untilday] : "1",
		(nfields > i_untiltime) ? fields[i_untiltime] : "0");
	z.z_untiltime = rpytime(&z.z_untilrule,
		z.z_untilrule.r_loyear);
	if (iscont && nzones > 0 &&
		z.z_untiltime > min_time &&
		z.z_untiltime < max_time &&
		zones[nzones - 1].z_untiltime > min_time &&
		zones[nzones - 1].z_untiltime < max_time &&
		zones[nzones - 1].z_untiltime >= z.z_untiltime) {
			error(_(
"Zone continuation line end time is not after end time of previous line"
				));
			return false;
	}
}
zones = growalloc(zones, sizeof *zones, nzones, &nzones_alloc);
zones[nzones++] = z;
/*
** If there was an UNTIL field on this line,
** there's more information about the zone on the next line.
*/
return hasuntil;
}

static void
inleap(register char ** const fields, const int nfields)
{
register const char *		cp;
register const struct lookup *	lp;
register int			i, j;
zic_t				year;
int				month, day;
zic_t				dayoff, tod;
zic_t				t;

if (nfields != LEAP_FIELDS) {
	error(_("wrong number of fields on Leap line"));
	return;
}
dayoff = 0;
cp = fields[LP_YEAR];
if (sscanf(cp, scheck(cp, "%"SCNdZIC), &year) != 1) {
	/*
	** Leapin' Lizards!
	*/
	error(_("invalid leaping year"));
	return;
}
if (!leapseen || leapmaxyear < year)
	leapmaxyear = year;
if (!leapseen || leapminyear > year)
	leapminyear = year;
leapseen = true;
j = EPOCH_YEAR;
while (j != year) {
	if (year > j) {
		i = len_years[isleap(j)];
		++j;
	} else {
		--j;
		i = -len_years[isleap(j)];
	}
	dayoff = oadd(dayoff, i);
}
if ((lp = byword(fields[LP_MONTH], mon_names)) == NULL) {
	error(_("invalid month name"));
	return;
}
month = lp->l_value;
j = TM_JANUARY;
while (j != month) {
	i = len_months[isleap(year)][j];
	dayoff = oadd(dayoff, i);
	++j;
}
cp = fields[LP_DAY];
if (sscanf(cp, scheck(cp, "%d"), &day) != 1 ||
	day <= 0 || day > len_months[isleap(year)][month]) {
		error(_("invalid day of month"));
		return;
}
dayoff = oadd(dayoff, day - 1);
if (dayoff < 0 && !TYPE_SIGNED(zic_t)) {
	error(_("time before zero"));
	return;
}
if (dayoff < min_time / SECSPERDAY) {
	error(_("time too small"));
	return;
}
if (dayoff > max_time / SECSPERDAY) {
	error(_("time too large"));
	return;
}
t = (zic_t) dayoff * SECSPERDAY;
tod = gethms(fields[LP_TIME], _("invalid time of day"), false);
cp = fields[LP_CORR];
{
	register int	positive;
	int		count;

	if (strcmp(cp, "") == 0) { /* infile() turns "-" into "" */
		positive = false;
		count = 1;
	} else if (strcmp(cp, "--") == 0) {
		positive = false;
		count = 2;
	} else if (strcmp(cp, "+") == 0) {
		positive = true;
		count = 1;
	} else if (strcmp(cp, "++") == 0) {
		positive = true;
		count = 2;
	} else {
		error(_("illegal CORRECTION field on Leap line"));
		return;
	}
	if ((lp = byword(fields[LP_ROLL], leap_types)) == NULL) {
		error(_(
			"illegal Rolling/Stationary field on Leap line"
			));
		return;
	}
	leapadd(tadd(t, tod), positive, lp->l_value, count);
}
}

static void
inlink(register char **const fields, const int nfields)
{
struct link	l;

if (nfields != LINK_FIELDS) {
	error(_("wrong number of fields on Link line"));
	return;
}
if (*fields[LF_FROM] == '\0') {
	error(_("blank FROM field on Link line"));
	return;
}
if (*fields[LF_TO] == '\0') {
	error(_("blank TO field on Link line"));
	return;
}
l.l_filename = filename;
l.l_linenum = linenum;
l.l_from = ecpyalloc(fields[LF_FROM]);
l.l_to = ecpyalloc(fields[LF_TO]);
links = growalloc(links, sizeof *links, nlinks, &nlinks_alloc);
links[nlinks++] = l;
}

static void
rulesub(register struct rule *const rp,
const char *const loyearp,
const char *const hiyearp,
const char *const typep,
const char *const monthp,
const char *const dayp,
const char *const timep)
{
register const struct lookup *	lp;
register const char *		cp;
register char *			dp;
register char *			ep;

if ((lp = byword(monthp, mon_names)) == NULL) {
	error(_("invalid month name"));
	return;
}
rp->r_month = lp->l_value;
rp->r_todisstd = false;
rp->r_todisgmt = false;
dp = ecpyalloc(timep);
if (*dp != '\0') {
	ep = dp + strlen(dp) - 1;
	switch (lowerit(*ep)) {
		case 's':	/* Standard */
			rp->r_todisstd = true;
			rp->r_todisgmt = false;
			*ep = '\0';
			break;
		case 'w':	/* Wall */
			rp->r_todisstd = false;
			rp->r_todisgmt = false;
			*ep = '\0';
			break;
		case 'g':	/* Greenwich */
		case 'u':	/* Universal */
		case 'z':	/* Zulu */
			rp->r_todisstd = true;
			rp->r_todisgmt = true;
			*ep = '\0';
			break;
	}
}
rp->r_tod = gethms(dp, _("invalid time of day"), false);
free(dp);
/*
** Year work.
*/
cp = loyearp;
lp = byword(cp, begin_years);
rp->r_lowasnum = lp == NULL;
if (!rp->r_lowasnum) switch ((int) lp->l_value) {
	case YR_MINIMUM:
		rp->r_loyear = ZIC_MIN;
		break;
	case YR_MAXIMUM:
		rp->r_loyear = ZIC_MAX;
		break;
	default:	/* "cannot happen" */
		(void) fprintf(stderr,
			_("%s: panic: Invalid l_value %d\n"),
			progname, lp->l_value);
		exit(EXIT_FAILURE);
} else if (sscanf(cp, scheck(cp, "%"SCNdZIC), &rp->r_loyear) != 1) {
	error(_("invalid starting year"));
	return;
}
cp = hiyearp;
lp = byword(cp, end_years);
rp->r_hiwasnum = lp == NULL;
if (!rp->r_hiwasnum) switch ((int) lp->l_value) {
	case YR_MINIMUM:
		rp->r_hiyear = ZIC_MIN;
		break;
	case YR_MAXIMUM:
		rp->r_hiyear = ZIC_MAX;
		break;
	case YR_ONLY:
		rp->r_hiyear = rp->r_loyear;
		break;
	default:	/* "cannot happen" */
		(void) fprintf(stderr,
			_("%s: panic: Invalid l_value %d\n"),
			progname, lp->l_value);
		exit(EXIT_FAILURE);
} else if (sscanf(cp, scheck(cp, "%"SCNdZIC), &rp->r_hiyear) != 1) {
	error(_("invalid ending year"));
	return;
}
if (rp->r_loyear > rp->r_hiyear) {
	error(_("starting year greater than ending year"));
	return;
}
if (*typep == '\0')
	rp->r_yrtype = NULL;
else {
	if (rp->r_loyear == rp->r_hiyear) {
		error(_("typed single year"));
		return;
	}
	rp->r_yrtype = ecpyalloc(typep);
}
/*
** Day work.
** Accept things such as:
**	1
**	last-Sunday
**	Sun<=20
**	Sun>=7
*/
dp = ecpyalloc(dayp);
if ((lp = byword(dp, lasts)) != NULL) {
	rp->r_dycode = DC_DOWLEQ;
	rp->r_wday = lp->l_value;
	rp->r_dayofmonth = len_months[1][rp->r_month];
} else {
	if ((ep = strchr(dp, '<')) != 0)
		rp->r_dycode = DC_DOWLEQ;
	else if ((ep = strchr(dp, '>')) != 0)
		rp->r_dycode = DC_DOWGEQ;
	else {
		ep = dp;
		rp->r_dycode = DC_DOM;
	}
	if (rp->r_dycode != DC_DOM) {
		*ep++ = 0;
		if (*ep++ != '=') {
			error(_("invalid day of month"));
			free(dp);
			return;
		}
		if ((lp = byword(dp, wday_names)) == NULL) {
			error(_("invalid weekday name"));
			free(dp);
			return;
		}
		rp->r_wday = lp->l_value;
	}
	if (sscanf(ep, scheck(ep, "%d"), &rp->r_dayofmonth) != 1 ||
		rp->r_dayofmonth <= 0 ||
		(rp->r_dayofmonth > len_months[1][rp->r_month])) {
			error(_("invalid day of month"));
			free(dp);
			return;
	}
}
free(dp);
}

static void
convert(const int_fast32_t val, char *const buf)
{
register int	i;
register int	shift;
unsigned char *const b = (unsigned char *) buf;

for (i = 0, shift = 24; i < 4; ++i, shift -= 8)
	b[i] = val >> shift;
}

static void
convert64(const zic_t val, char *const buf)
{
register int	i;
register int	shift;
unsigned char *const b = (unsigned char *) buf;

for (i = 0, shift = 56; i < 8; ++i, shift -= 8)
	b[i] = val >> shift;
}

static void
puttzcode(const int_fast32_t val, FILE *const fp)
{
char	buf[4];

convert(val, buf);
(void) fwrite(buf, sizeof buf, 1, fp);
}

static void
puttzcode64(const zic_t val, FILE *const fp)
{
char	buf[8];

convert64(val, buf);
(void) fwrite(buf, sizeof buf, 1, fp);
}

static int
atcomp(const void *avp, const void *bvp)
{
const zic_t	a = ((const struct attype *) avp)->at;
const zic_t	b = ((const struct attype *) bvp)->at;

return (a < b) ? -1 : (a > b);
}

static int
is32(const zic_t x)
{
return INT32_MIN <= x && x <= INT32_MAX;
}

static void
writezone(const char *const name, const char *const string, char version)
{
register FILE *			fp;
register int			i, j;
register int			leapcnt32, leapi32;
register int			timecnt32, timei32;
register int			pass;
static char *			fullname;
static const struct tzhead	tzh0;
static struct tzhead		tzh;
zic_t *ats = emalloc(size_product(timecnt, sizeof *ats + 1));
void *typesptr = ats + timecnt;
unsigned char *types = typesptr;

/*
** Sort.
*/
if (timecnt > 1)
	(void) qsort(attypes, timecnt, sizeof *attypes, atcomp);
/*
** Optimize.
*/
{
	int	fromi;
	int	toi;

	toi = 0;
	fromi = 0;
	while (fromi < timecnt && attypes[fromi].at < min_time)
		++fromi;
	/*
	** Remember that type 0 is reserved.
	*/
	if (isdsts[1] == 0)
		while (fromi < timecnt && attypes[fromi].type == 1)
			++fromi;	/* handled by default rule */
	for ( ; fromi < timecnt; ++fromi) {
		if (toi != 0 && ((attypes[fromi].at +
			gmtoffs[attypes[toi - 1].type]) <=
			(attypes[toi - 1].at + gmtoffs[toi == 1 ? 0
			: attypes[toi - 2].type]))) {
				attypes[toi - 1].type =
					attypes[fromi].type;
				continue;
		}
		if (toi == 0 ||
			attypes[toi - 1].type != attypes[fromi].type)
				attypes[toi++] = attypes[fromi];
	}
	timecnt = toi;
}
/*
** Transfer.
*/
for (i = 0; i < timecnt; ++i) {
	ats[i] = attypes[i].at;
	types[i] = attypes[i].type;
}
/*
** Correct for leap seconds.
*/
for (i = 0; i < timecnt; ++i) {
	j = leapcnt;
	while (--j >= 0)
		if (ats[i] > trans[j] - corr[j]) {
			ats[i] = tadd(ats[i], corr[j]);
			break;
		}
}
/*
** Figure out 32-bit-limited starts and counts.
*/
timecnt32 = timecnt;
timei32 = 0;
leapcnt32 = leapcnt;
leapi32 = 0;
while (timecnt32 > 0 && !is32(ats[timecnt32 - 1]))
	--timecnt32;
while (timecnt32 > 0 && !is32(ats[timei32])) {
	--timecnt32;
	++timei32;
}
while (leapcnt32 > 0 && !is32(trans[leapcnt32 - 1]))
	--leapcnt32;
while (leapcnt32 > 0 && !is32(trans[leapi32])) {
	--leapcnt32;
	++leapi32;
}
fullname = erealloc(fullname,
		    strlen(directory) + 1 + strlen(name) + 1);
(void) sprintf(fullname, "%s/%s", directory, name);
/*
** Remove old file, if any, to snap links.
*/
if (!itsdir(fullname) && remove(fullname) != 0 && errno != ENOENT) {
	const char *e = strerror(errno);

	(void) fprintf(stderr, _("%s: Can't remove %s: %s\n"),
		progname, fullname, e);
	exit(EXIT_FAILURE);
}
if ((fp = fopen(fullname, "wb")) == NULL) {
	if (mkdirs(fullname) != 0)
		exit(EXIT_FAILURE);
	if ((fp = fopen(fullname, "wb")) == NULL) {
		const char *e = strerror(errno);

		(void) fprintf(stderr, _("%s: Can't create %s: %s\n"),
			progname, fullname, e);
		exit(EXIT_FAILURE);
	}
}
for (pass = 1; pass <= 2; ++pass) {
	register int	thistimei, thistimecnt;
	register int	thisleapi, thisleapcnt;
	register int	thistimelim, thisleaplim;
	int		writetype[TZ_MAX_TYPES];
	int		typemap[TZ_MAX_TYPES];
	register int	thistypecnt;
	char		thischars[TZ_MAX_CHARS];
	char		thischarcnt;
	int 		indmap[TZ_MAX_CHARS];

	if (pass == 1) {
		thistimei = timei32;
		thistimecnt = timecnt32;
		thisleapi = leapi32;
		thisleapcnt = leapcnt32;
	} else {
		thistimei = 0;
		thistimecnt = timecnt;
		thisleapi = 0;
		thisleapcnt = leapcnt;
	}
	thistimelim = thistimei + thistimecnt;
	thisleaplim = thisleapi + thisleapcnt;
	/*
	** Remember that type 0 is reserved.
	*/
	writetype[0] = false;
	for (i = 1; i < typecnt; ++i)
		writetype[i] = thistimecnt == timecnt;
	if (thistimecnt == 0) {
		/*
		** No transition times fall in the current
		** (32- or 64-bit) window.
		*/
		if (typecnt != 0)
			writetype[typecnt - 1] = true;
	} else {
		for (i = thistimei - 1; i < thistimelim; ++i)
			if (i >= 0)
				writetype[types[i]] = true;
		/*
		** For America/Godthab and Antarctica/Palmer
		*/
		/*
		** Remember that type 0 is reserved.
		*/
		if (thistimei == 0)
			writetype[1] = true;
	}
#ifndef LEAVE_SOME_PRE_2011_SYSTEMS_IN_THE_LURCH
	/*
	** For some pre-2011 systems: if the last-to-be-written
	** standard (or daylight) type has an offset different from the
	** most recently used offset,
	** append an (unused) copy of the most recently used type
	** (to help get global "altzone" and "timezone" variables
	** set correctly).
	*/
	{
		register int	mrudst, mrustd, hidst, histd, type;

		hidst = histd = mrudst = mrustd = -1;
		for (i = thistimei; i < thistimelim; ++i)
			if (isdsts[types[i]])
				mrudst = types[i];
			else	mrustd = types[i];
		for (i = 0; i < typecnt; ++i)
			if (writetype[i]) {
				if (isdsts[i])
					hidst = i;
				else	histd = i;
			}
		if (hidst >= 0 && mrudst >= 0 && hidst != mrudst &&
			gmtoffs[hidst] != gmtoffs[mrudst]) {
				isdsts[mrudst] = -1;
				type = addtype(gmtoffs[mrudst],
#ifdef ICU
					rawoffs[mrudst], dstoffs[mrudst],
#endif
					&chars[abbrinds[mrudst]],
					true,
					ttisstds[mrudst],
					ttisgmts[mrudst]);
				isdsts[mrudst] = true;
				writetype[type] = true;
		}
		if (histd >= 0 && mrustd >= 0 && histd != mrustd &&
			gmtoffs[histd] != gmtoffs[mrustd]) {
				isdsts[mrustd] = -1;
				type = addtype(gmtoffs[mrustd],
#ifdef ICU
					rawoffs[mrudst], dstoffs[mrudst],
#endif
					&chars[abbrinds[mrustd]],
					false,
					ttisstds[mrustd],
					ttisgmts[mrustd]);
				isdsts[mrustd] = false;
				writetype[type] = true;
		}
	}
#endif /* !defined LEAVE_SOME_PRE_2011_SYSTEMS_IN_THE_LURCH */
	thistypecnt = 0;
	/*
	** Potentially, set type 0 to that of lowest-valued time.
	*/
	if (thistimei > 0) {
		for (i = 1; i < typecnt; ++i)
			if (writetype[i] && !isdsts[i])
				break;
		if (i != types[thistimei - 1]) {
			i = types[thistimei - 1];
			gmtoffs[0] = gmtoffs[i];
			isdsts[0] = isdsts[i];
			ttisstds[0] = ttisstds[i];
			ttisgmts[0] = ttisgmts[i];
			abbrinds[0] = abbrinds[i];
			writetype[0] = true;
			writetype[i] = false;
		}
	}
	for (i = 0; i < typecnt; ++i)
		typemap[i] = writetype[i] ?  thistypecnt++ : 0;
	for (i = 0; i < sizeof indmap / sizeof indmap[0]; ++i)
		indmap[i] = -1;
	thischarcnt = 0;
	for (i = 0; i < typecnt; ++i) {
		register char *	thisabbr;

		if (!writetype[i])
			continue;
		if (indmap[abbrinds[i]] >= 0)
			continue;
		thisabbr = &chars[abbrinds[i]];
		for (j = 0; j < thischarcnt; ++j)
			if (strcmp(&thischars[j], thisabbr) == 0)
				break;
		if (j == thischarcnt) {
			(void) strcpy(&thischars[(int) thischarcnt],
				thisabbr);
			thischarcnt += strlen(thisabbr) + 1;
		}
		indmap[abbrinds[i]] = j;
	}
#define DO(field)	((void) fwrite(tzh.field, sizeof tzh.field, 1, fp))
	tzh = tzh0;
#ifdef ICU
	* (ICUZoneinfoVersion*) &tzh.tzh_reserved = TZ_ICU_VERSION;
	(void) strncpy(tzh.tzh_magic, TZ_ICU_MAGIC, sizeof tzh.tzh_magic);
#else
	(void) strncpy(tzh.tzh_magic, TZ_MAGIC, sizeof tzh.tzh_magic);
#endif
	tzh.tzh_version[0] = version;
	convert(thistypecnt, tzh.tzh_ttisgmtcnt);
	convert(thistypecnt, tzh.tzh_ttisstdcnt);
	convert(thisleapcnt, tzh.tzh_leapcnt);
	convert(thistimecnt, tzh.tzh_timecnt);
	convert(thistypecnt, tzh.tzh_typecnt);
	convert(thischarcnt, tzh.tzh_charcnt);
	DO(tzh_magic);
	DO(tzh_version);
	DO(tzh_reserved);
	DO(tzh_ttisgmtcnt);
	DO(tzh_ttisstdcnt);
	DO(tzh_leapcnt);
	DO(tzh_timecnt);
	DO(tzh_typecnt);
	DO(tzh_charcnt);
#undef DO
	for (i = thistimei; i < thistimelim; ++i)
		if (pass == 1)
			puttzcode(ats[i], fp);
		else	puttzcode64(ats[i], fp);
	for (i = thistimei; i < thistimelim; ++i) {
		unsigned char	uc;

		uc = typemap[types[i]];
		(void) fwrite(&uc, sizeof uc, 1, fp);
	}
	for (i = 0; i < typecnt; ++i)
		if (writetype[i]) {
#ifdef ICU
			puttzcode(rawoffs[i], fp);
			puttzcode(dstoffs[i], fp);
#else
			puttzcode(gmtoffs[i], fp);
#endif
			(void) putc(isdsts[i], fp);
			(void) putc((unsigned char) indmap[abbrinds[i]], fp);
		}
	if (thischarcnt != 0)
		(void) fwrite(thischars, sizeof thischars[0],
			      thischarcnt, fp);
	for (i = thisleapi; i < thisleaplim; ++i) {
		register zic_t	todo;

		if (roll[i]) {
			if (timecnt == 0 || trans[i] < ats[0]) {
				j = 0;
				while (isdsts[j])
					if (++j >= typecnt) {
						j = 0;
						break;
					}
			} else {
				j = 1;
				while (j < timecnt &&
					trans[i] >= ats[j])
						++j;
				j = types[j - 1];
			}
			todo = tadd(trans[i], -gmtoffs[j]);
		} else	todo = trans[i];
		if (pass == 1)
			puttzcode(todo, fp);
		else	puttzcode64(todo, fp);
		puttzcode(corr[i], fp);
	}
	for (i = 0; i < typecnt; ++i)
		if (writetype[i])
			(void) putc(ttisstds[i], fp);
	for (i = 0; i < typecnt; ++i)
		if (writetype[i])
			(void) putc(ttisgmts[i], fp);
}
(void) fprintf(fp, "\n%s\n", string);
if (ferror(fp) || fclose(fp)) {
	(void) fprintf(stderr, _("%s: Error writing %s\n"),
		progname, fullname);
	exit(EXIT_FAILURE);
}
free(ats);
}

static void
doabbr(char *const abbr, const char *const format, const char *const letters,
      const int isdst, const int doquotes)
{
register char *	cp;
register char *	slashp;
register int	len;

slashp = strchr(format, '/');
if (slashp == NULL) {
	if (letters == NULL)
		(void) strcpy(abbr, format);
	else	(void) sprintf(abbr, format, letters);
} else if (isdst) {
	(void) strcpy(abbr, slashp + 1);
} else {
	if (slashp > format)
		(void) strncpy(abbr, format, slashp - format);
	abbr[slashp - format] = '\0';
}
if (!doquotes)
	return;
for (cp = abbr; *cp != '\0'; ++cp)
	if (strchr("ABCDEFGHIJKLMNOPQRSTUVWXYZ", *cp) == NULL &&
		strchr("abcdefghijklmnopqrstuvwxyz", *cp) == NULL)
			break;
len = strlen(abbr);
if (len > 0 && *cp == '\0')
	return;
abbr[len + 2] = '\0';
abbr[len + 1] = '>';
for ( ; len > 0; --len)
	abbr[len] = abbr[len - 1];
abbr[0] = '<';
}

static void
updateminmax(const zic_t x)
{
if (min_year > x)
	min_year = x;
if (max_year < x)
	max_year = x;
}

static int
stringoffset(char *result, zic_t offset)
{
register int	hours;
register int	minutes;
register int	seconds;

result[0] = '\0';
if (offset < 0) {
	(void) strcpy(result, "-");
	offset = -offset;
}
seconds = offset % SECSPERMIN;
offset /= SECSPERMIN;
minutes = offset % MINSPERHOUR;
offset /= MINSPERHOUR;
hours = offset;
if (hours >= HOURSPERDAY * DAYSPERWEEK) {
	result[0] = '\0';
	return -1;
}
(void) sprintf(end(result), "%d", hours);
if (minutes != 0 || seconds != 0) {
	(void) sprintf(end(result), ":%02d", minutes);
	if (seconds != 0)
		(void) sprintf(end(result), ":%02d", seconds);
}
return 0;
}

static int
stringrule(char *result, const struct rule *const rp, const zic_t dstoff,
   const zic_t gmtoff)
{
register zic_t	tod = rp->r_tod;
register int	compat = 0;

result = end(result);
if (rp->r_dycode == DC_DOM) {
	register int	month, total;

	if (rp->r_dayofmonth == 29 && rp->r_month == TM_FEBRUARY)
		return -1;
	total = 0;
	for (month = 0; month < rp->r_month; ++month)
		total += len_months[0][month];
	/* Omit the "J" in Jan and Feb, as that's shorter.  */
	if (rp->r_month <= 1)
	  (void) sprintf(result, "%d", total + rp->r_dayofmonth - 1);
	else
	  (void) sprintf(result, "J%d", total + rp->r_dayofmonth);
} else {
	register int	week;
	register int	wday = rp->r_wday;
	register int	wdayoff;

	if (rp->r_dycode == DC_DOWGEQ) {
		wdayoff = (rp->r_dayofmonth - 1) % DAYSPERWEEK;
		if (wdayoff)
			compat = 2013;
		wday -= wdayoff;
		tod += wdayoff * SECSPERDAY;
		week = 1 + (rp->r_dayofmonth - 1) / DAYSPERWEEK;
	} else if (rp->r_dycode == DC_DOWLEQ) {
		if (rp->r_dayofmonth == len_months[1][rp->r_month])
			week = 5;
		else {
			wdayoff = rp->r_dayofmonth % DAYSPERWEEK;
			if (wdayoff)
				compat = 2013;
			wday -= wdayoff;
			tod += wdayoff * SECSPERDAY;
			week = rp->r_dayofmonth / DAYSPERWEEK;
		}
	} else	return -1;	/* "cannot happen" */
	if (wday < 0)
		wday += DAYSPERWEEK;
	(void) sprintf(result, "M%d.%d.%d",
		rp->r_month + 1, week, wday);
}
if (rp->r_todisgmt)
	tod += gmtoff;
if (rp->r_todisstd && rp->r_stdoff == 0)
	tod += dstoff;
if (tod != 2 * SECSPERMIN * MINSPERHOUR) {
	(void) strcat(result, "/");
	if (stringoffset(end(result), tod) != 0)
		return -1;
	if (tod < 0) {
		if (compat < 2013)
			compat = 2013;
	} else if (SECSPERDAY <= tod) {
		if (compat < 1994)
			compat = 1994;
	}
}
return compat;
}

static int
rule_cmp(struct rule const *a, struct rule const *b)
{
if (!a)
	return -!!b;
if (!b)
	return 1;
if (a->r_hiyear != b->r_hiyear)
	return a->r_hiyear < b->r_hiyear ? -1 : 1;
if (a->r_month - b->r_month != 0)
	return a->r_month - b->r_month;
return a->r_dayofmonth - b->r_dayofmonth;
}

enum { YEAR_BY_YEAR_ZONE = 1 };

static int
stringzone(char *result, const struct zone *const zpfirst, const int zonecount)
{
register const struct zone *	zp;
register struct rule *		rp;
register struct rule *		stdrp;
register struct rule *		dstrp;
register int			i;
register const char *		abbrvar;
register int			compat = 0;
register int			c;
struct rule			stdr, dstr;

result[0] = '\0';
zp = zpfirst + zonecount - 1;
stdrp = dstrp = NULL;
for (i = 0; i < zp->z_nrules; ++i) {
	rp = &zp->z_rules[i];
	if (rp->r_hiwasnum || rp->r_hiyear != ZIC_MAX)
		continue;
	if (rp->r_yrtype != NULL)
		continue;
	if (rp->r_stdoff == 0) {
		if (stdrp == NULL)
			stdrp = rp;
		else	return -1;
	} else {
		if (dstrp == NULL)
			dstrp = rp;
		else	return -1;
	}
}
if (stdrp == NULL && dstrp == NULL) {
	/*
	** There are no rules running through "max".
	** Find the latest std rule in stdabbrrp
	** and latest rule of any type in stdrp.
	*/
	register struct rule *stdabbrrp = NULL;
	for (i = 0; i < zp->z_nrules; ++i) {
		rp = &zp->z_rules[i];
		if (rp->r_stdoff == 0 && rule_cmp(stdabbrrp, rp) < 0)
			stdabbrrp = rp;
		if (rule_cmp(stdrp, rp) < 0)
			stdrp = rp;
	}
	/*
	** Horrid special case: if year is 2037,
	** presume this is a zone handled on a year-by-year basis;
	** do not try to apply a rule to the zone.
	*/
	if (stdrp != NULL && stdrp->r_hiyear == 2037)
		return YEAR_BY_YEAR_ZONE;

	if (stdrp != NULL && stdrp->r_stdoff != 0) {
		/* Perpetual DST.  */
		dstr.r_month = TM_JANUARY;
		dstr.r_dycode = DC_DOM;
		dstr.r_dayofmonth = 1;
		dstr.r_tod = 0;
		dstr.r_todisstd = dstr.r_todisgmt = false;
		dstr.r_stdoff = stdrp->r_stdoff;
		dstr.r_abbrvar = stdrp->r_abbrvar;
		stdr.r_month = TM_DECEMBER;
		stdr.r_dycode = DC_DOM;
		stdr.r_dayofmonth = 31;
		stdr.r_tod = SECSPERDAY + stdrp->r_stdoff;
		stdr.r_todisstd = stdr.r_todisgmt = false;
		stdr.r_stdoff = 0;
		stdr.r_abbrvar
		  = (stdabbrrp ? stdabbrrp->r_abbrvar : "");
		dstrp = &dstr;
		stdrp = &stdr;
	}
}
if (stdrp == NULL && (zp->z_nrules != 0 || zp->z_stdoff != 0))
	return -1;
abbrvar = (stdrp == NULL) ? "" : stdrp->r_abbrvar;
doabbr(result, zp->z_format, abbrvar, false, true);
if (stringoffset(end(result), -zp->z_gmtoff) != 0) {
	result[0] = '\0';
	return -1;
}
if (dstrp == NULL)
	return compat;
doabbr(end(result), zp->z_format, dstrp->r_abbrvar, true, true);
if (dstrp->r_stdoff != SECSPERMIN * MINSPERHOUR)
	if (stringoffset(end(result),
		-(zp->z_gmtoff + dstrp->r_stdoff)) != 0) {
			result[0] = '\0';
			return -1;
	}
(void) strcat(result, ",");
c = stringrule(result, dstrp, dstrp->r_stdoff, zp->z_gmtoff);
if (c < 0) {
	result[0] = '\0';
	return -1;
}
if (compat < c)
	compat = c;
(void) strcat(result, ",");
c = stringrule(result, stdrp, dstrp->r_stdoff, zp->z_gmtoff);
if (c < 0) {
	result[0] = '\0';
	return -1;
}
if (compat < c)
	compat = c;
return compat;
}

static void
outzone(const struct zone * const zpfirst, const int zonecount)
{
register const struct zone *	zp;
register struct rule *		rp;
register int			i, j;
register int			usestart, useuntil;
register zic_t			starttime, untiltime;
register zic_t			gmtoff;
register zic_t			stdoff;
register zic_t			year;
register zic_t			startoff;
register int			startttisstd;
register int			startttisgmt;
register int			type;
register char *			startbuf;
register char *			ab;
register char *			envvar;
register int			max_abbr_len;
register int			max_envvar_len;
register int			prodstic; /* all rules are min to max */
register int			compat;
register int			do_extend;
register char			version;
#ifdef ICU
int						finalRuleYear, finalRuleIndex;
const struct rule*		finalRule1;
const struct rule*		finalRule2;
#endif

max_abbr_len = 2 + max_format_len + max_abbrvar_len;
max_envvar_len = 2 * max_abbr_len + 5 * 9;
startbuf = emalloc(max_abbr_len + 1);
ab = emalloc(max_abbr_len + 1);
envvar = emalloc(max_envvar_len + 1);
INITIALIZE(untiltime);
INITIALIZE(starttime);
/*
** Now. . .finally. . .generate some useful data!
*/
timecnt = 0;
typecnt = 0;
charcnt = 0;
prodstic = zonecount == 1;
/*
** Thanks to Earl Chew
** for noting the need to unconditionally initialize startttisstd.
*/
startttisstd = false;
startttisgmt = false;
min_year = max_year = EPOCH_YEAR;
if (leapseen) {
	updateminmax(leapminyear);
	updateminmax(leapmaxyear + (leapmaxyear < ZIC_MAX));
}
/*
** Reserve type 0.
*/
gmtoffs[0] = isdsts[0] = ttisstds[0] = ttisgmts[0] = abbrinds[0] = -1;
typecnt = 1;
for (i = 0; i < zonecount; ++i) {
	zp = &zpfirst[i];
	if (i < zonecount - 1)
		updateminmax(zp->z_untilrule.r_loyear);
	for (j = 0; j < zp->z_nrules; ++j) {
		rp = &zp->z_rules[j];
		if (rp->r_lowasnum)
			updateminmax(rp->r_loyear);
		if (rp->r_hiwasnum)
			updateminmax(rp->r_hiyear);
		if (rp->r_lowasnum || rp->r_hiwasnum)
			prodstic = false;
	}
}
/*
** Generate lots of data if a rule can't cover all future times.
*/
compat = stringzone(envvar, zpfirst, zonecount);
version = compat < 2013 ? ZIC_VERSION_PRE_2013 : ZIC_VERSION;
do_extend = compat < 0 || compat == YEAR_BY_YEAR_ZONE;
#ifdef ICU
do_extend = 0;
#endif
if (noise) {
	if (!*envvar)
		warning("%s %s",
			_("no POSIX environment variable for zone"),
			zpfirst->z_name);
	else if (compat != 0 && compat != YEAR_BY_YEAR_ZONE) {
		/* Circa-COMPAT clients, and earlier clients, might
		   not work for this zone when given dates before
		   1970 or after 2038.  */
		warning(_("%s: pre-%d clients may mishandle"
			  " distant timestamps"),
			zpfirst->z_name, compat);
	}
}
if (do_extend) {
	/*
	** Search through a couple of extra years past the obvious
	** 400, to avoid edge cases.  For example, suppose a non-POSIX
	** rule applies from 2012 onwards and has transitions in March
	** and September, plus some one-off transitions in November
	** 2013.  If zic looked only at the last 400 years, it would
	** set max_year=2413, with the intent that the 400 years 2014
	** through 2413 will be repeated.  The last transition listed
	** in the tzfile would be in 2413-09, less than 400 years
	** after the last one-off transition in 2013-11.  Two years
	** might be overkill, but with the kind of edge cases
	** available we're not sure that one year would suffice.
	*/
	enum { years_of_observations = YEARSPERREPEAT + 2 };

	if (min_year >= ZIC_MIN + years_of_observations)
		min_year -= years_of_observations;
	else	min_year = ZIC_MIN;
	if (max_year <= ZIC_MAX - years_of_observations)
		max_year += years_of_observations;
	else	max_year = ZIC_MAX;
	/*
	** Regardless of any of the above,
	** for a "proDSTic" zone which specifies that its rules
	** always have and always will be in effect,
	** we only need one cycle to define the zone.
	*/
	if (prodstic) {
		min_year = 1900;
		max_year = min_year + years_of_observations;
	}
}
/*
** For the benefit of older systems,
** generate data from 1900 through 2037.
*/
if (min_year > 1900)
	min_year = 1900;
if (max_year < 2037)
	max_year = 2037;
for (i = 0; i < zonecount; ++i) {
	/*
	** A guess that may well be corrected later.
	*/
	stdoff = 0;
	zp = &zpfirst[i];
	usestart = i > 0 && (zp - 1)->z_untiltime > min_time;
	useuntil = i < (zonecount - 1);
	if (useuntil && zp->z_untiltime <= min_time)
		continue;
	gmtoff = zp->z_gmtoff;
	eat(zp->z_filename, zp->z_linenum);
	*startbuf = '\0';
	startoff = zp->z_gmtoff;
#ifdef ICU
	finalRuleYear = finalRuleIndex = -1;
	finalRule1 = finalRule2 = NULL;
	if (i == (zonecount - 1)) { /* !useuntil */
		/* Look for exactly 2 rules that end at 'max' and
		 * note them. Determine max(r_loyear) for the 2 of
		 * them. */
		for (j=0; j<zp->z_nrules; ++j) {
			rp = &zp->z_rules[j];
			if (rp->r_hiyear == ZIC_MAX) {
				if (rp->r_loyear > finalRuleYear) {
					finalRuleYear = rp->r_loyear;
				}
				if (finalRule1 == NULL) {
					finalRule1 = rp;
				} else if (finalRule2 == NULL) {
					finalRule2 = rp;
				} else {
					error("more than two max rules found (ICU)");
					exit(EXIT_FAILURE);
				}
			} else if (rp->r_hiyear >= finalRuleYear) {
				/* There might be an overriding non-max rule
				 * to be applied to a specific year after one of
				 * max rule's start year. For example,
				 *
				 * Rule Foo 2010 max ...
				 * Rule Foo 2015 only ...
				 *
				 * In this case, we need to change the start year of
				 * the final (max) rules to the next year. */
				finalRuleYear = rp->r_hiyear + 1;

				/* When above adjustment is done, max_year might need
				 * to be adjusted, so the final rule will be properly
				 * evaluated and emitted by the later code block.
				 *
				 * Note: This may push the start year of the final
				 * rules ahead by 1 year unnecessarily. For example,
				 * If there are two rules, non-max rule and max rule
				 * starting in the same year, such as
				 *
				 * Rule Foo 2010 only ....
				 * Rule Foo 2010 max ....
				 *
				 * In this case, the final (max) rule actually starts
				 * in 2010, instead of 2010. We could make this tool
				 * more intelligent to detect such situation. But pushing
				 * final rule start year to 1 year ahead (in the worst case)
				 * will just populate a few extra transitions, and it still
				 * works fine. So for now, we're not trying to put additional
				 * logic to optimize the case.
				 */
				if (max_year < finalRuleYear) {
					max_year = finalRuleYear;
				}
			}
		}
		if (finalRule1 != NULL) {
			if (finalRule2 == NULL) {
				warning("only one max rule found (ICU)");
				finalRuleYear = finalRuleIndex = -1;
				finalRule1 = NULL;
			} else {
				if (finalRule1->r_stdoff == finalRule2->r_stdoff) {
					/* America/Resolute in 2009a uses a pair of rules
					 * which does not change the offset.  ICU ignores
					 * such rules without actual time transitions. */
					finalRuleYear = finalRuleIndex = -1;
					finalRule1 = finalRule2 = NULL; 
				} else {
					/* Swap if necessary so finalRule1 occurs before
					 * finalRule2 */
					if (finalRule1->r_month > finalRule2->r_month) {
						const struct rule* t = finalRule1;
						finalRule1 = finalRule2;
						finalRule2 = t;
					}
					/* Add final rule to our list */
					finalRuleIndex = add_icu_final_rules(finalRule1, finalRule2);
				}
			}
		}
	}
#endif

	if (zp->z_nrules == 0) {
		stdoff = zp->z_stdoff;
		doabbr(startbuf, zp->z_format,
		       NULL, stdoff != 0, false);
		type = addtype(oadd(zp->z_gmtoff, stdoff),
#ifdef ICU
			zp->z_gmtoff, stdoff,
#endif
			startbuf, stdoff != 0, startttisstd,
			startttisgmt);
		if (usestart) {
			addtt(starttime, type);
			usestart = false;
		} else if (stdoff != 0)
			addtt(min_time, type);
	} else for (year = min_year; year <= max_year; ++year) {
		if (useuntil && year > zp->z_untilrule.r_hiyear)
			break;
		/*
		** Mark which rules to do in the current year.
		** For those to do, calculate rpytime(rp, year);
		*/
		for (j = 0; j < zp->z_nrules; ++j) {
			rp = &zp->z_rules[j];
			eats(zp->z_filename, zp->z_linenum,
				rp->r_filename, rp->r_linenum);
			rp->r_todo = year >= rp->r_loyear &&
					year <= rp->r_hiyear &&
					yearistype(year, rp->r_yrtype);
			if (rp->r_todo)
				rp->r_temp = rpytime(rp, year);
		}
		for ( ; ; ) {
			register int	k;
			register zic_t	jtime, ktime;
			register zic_t	offset;

			INITIALIZE(ktime);
			if (useuntil) {
				/*
				** Turn untiltime into UT
				** assuming the current gmtoff and
				** stdoff values.
				*/
				untiltime = zp->z_untiltime;
				if (!zp->z_untilrule.r_todisgmt)
					untiltime = tadd(untiltime,
						-gmtoff);
				if (!zp->z_untilrule.r_todisstd)
					untiltime = tadd(untiltime,
						-stdoff);
			}
			/*
			** Find the rule (of those to do, if any)
			** that takes effect earliest in the year.
			*/
			k = -1;
			for (j = 0; j < zp->z_nrules; ++j) {
				rp = &zp->z_rules[j];
				if (!rp->r_todo)
					continue;
				eats(zp->z_filename, zp->z_linenum,
					rp->r_filename, rp->r_linenum);
				offset = rp->r_todisgmt ? 0 : gmtoff;
				if (!rp->r_todisstd)
					offset = oadd(offset, stdoff);
				jtime = rp->r_temp;
				if (jtime == min_time ||
					jtime == max_time)
						continue;
				jtime = tadd(jtime, -offset);
				if (k < 0 || jtime < ktime) {
					k = j;
					ktime = jtime;
				}
			}
			if (k < 0)
				break;	/* go on to next year */
			rp = &zp->z_rules[k];
			rp->r_todo = false;
			if (useuntil && ktime >= untiltime)
				break;
			stdoff = rp->r_stdoff;
			if (usestart && ktime == starttime)
				usestart = false;
			if (usestart) {
				if (ktime < starttime) {
					startoff = oadd(zp->z_gmtoff,
						stdoff);
					doabbr(startbuf, zp->z_format,
						rp->r_abbrvar,
						rp->r_stdoff != 0,
						false);
					continue;
				}
				if (*startbuf == '\0' &&
					startoff == oadd(zp->z_gmtoff,
					stdoff)) {
						doabbr(startbuf,
							zp->z_format,
							rp->r_abbrvar,
							rp->r_stdoff !=
							0,
							false);
				}
			}
#ifdef ICU
			if (year >= finalRuleYear && rp == finalRule1) {
				/* We want to shift final year 1 year after
				 * the actual final rule takes effect (year + 1),
				 * because the previous type is valid until the first
				 * transition defined by the final rule.  Otherwise
				 * we may see unexpected offset shift at the
				 * beginning of the year when the final rule takes
				 * effect.
				 *
				 * Note: This may results some 64bit second transitions
				 * at the very end (year 2038). ICU 4.2 or older releases
				 * cannot handle 64bit second transitions and they are
				 * dropped from zoneinfo.txt. */
				emit_icu_zone(icuFile,
						zpfirst->z_name, zp->z_gmtoff,
						rp, finalRuleIndex, year + 1);
				/* only emit this for the first year */
				finalRule1 = NULL;
			}
#endif
			eats(zp->z_filename, zp->z_linenum,
				rp->r_filename, rp->r_linenum);
			doabbr(ab, zp->z_format, rp->r_abbrvar,
				rp->r_stdoff != 0, false);
			offset = oadd(zp->z_gmtoff, rp->r_stdoff);
#ifdef ICU
			type = addtype(offset, zp->z_gmtoff, rp->r_stdoff,
				ab, rp->r_stdoff != 0,
				rp->r_todisstd, rp->r_todisgmt);
#else
			type = addtype(offset, ab, rp->r_stdoff != 0,
				rp->r_todisstd, rp->r_todisgmt);
#endif
			addtt(ktime, type);
		}
	}
	if (usestart) {
		if (*startbuf == '\0' &&
			zp->z_format != NULL &&
			strchr(zp->z_format, '%') == NULL &&
			strchr(zp->z_format, '/') == NULL)
				(void) strcpy(startbuf, zp->z_format);
		eat(zp->z_filename, zp->z_linenum);
		if (*startbuf == '\0')
error(_("can't determine time zone abbreviation to use just after until time"));
		else	addtt(starttime,
#ifdef ICU
				addtype(startoff,
					zp->z_gmtoff, startoff - zp->z_gmtoff,
					startbuf,
					startoff != zp->z_gmtoff,
					startttisstd,
					startttisgmt));
#else
				addtype(startoff, startbuf,
					startoff != zp->z_gmtoff,
					startttisstd,
					startttisgmt));
#endif
	}
	/*
	** Now we may get to set starttime for the next zone line.
	*/
	if (useuntil) {
		startttisstd = zp->z_untilrule.r_todisstd;
		startttisgmt = zp->z_untilrule.r_todisgmt;
		starttime = zp->z_untiltime;
		if (!startttisstd)
			starttime = tadd(starttime, -stdoff);
		if (!startttisgmt)
			starttime = tadd(starttime, -gmtoff);
	}
}
if (do_extend) {
	/*
	** If we're extending the explicitly listed observations
	** for 400 years because we can't fill the POSIX-TZ field,
	** check whether we actually ended up explicitly listing
	** observations through that period.  If there aren't any
	** near the end of the 400-year period, add a redundant
	** one at the end of the final year, to make it clear
	** that we are claiming to have definite knowledge of
	** the lack of transitions up to that point.
	*/
	struct rule xr;
	struct attype *lastat;
	xr.r_month = TM_JANUARY;
	xr.r_dycode = DC_DOM;
	xr.r_dayofmonth = 1;
	xr.r_tod = 0;
	for (lastat = &attypes[0], i = 1; i < timecnt; i++)
		if (attypes[i].at > lastat->at)
			lastat = &attypes[i];
	if (lastat->at < rpytime(&xr, max_year - 1)) {
		/*
		** Create new type code for the redundant entry,
		** to prevent it being optimised away.
		*/
		if (typecnt >= TZ_MAX_TYPES) {
			error(_("too many local time types"));
			exit(EXIT_FAILURE);
		}
		gmtoffs[typecnt] = gmtoffs[lastat->type];
		isdsts[typecnt] = isdsts[lastat->type];
		ttisstds[typecnt] = ttisstds[lastat->type];
		ttisgmts[typecnt] = ttisgmts[lastat->type];
		abbrinds[typecnt] = abbrinds[lastat->type];
		++typecnt;
		addtt(rpytime(&xr, max_year + 1), typecnt-1);
	}
}
writezone(zpfirst->z_name, envvar, version);
free(startbuf);
free(ab);
free(envvar);
}

static void
addtt(const zic_t starttime, int type)
{
if (starttime <= min_time ||
	(timecnt == 1 && attypes[0].at < min_time)) {
	gmtoffs[0] = gmtoffs[type];
#ifdef ICU
	rawoffs[0] = rawoffs[type];
	dstoffs[0] = dstoffs[type];
#endif
	isdsts[0] = isdsts[type];
	ttisstds[0] = ttisstds[type];
	ttisgmts[0] = ttisgmts[type];
	if (abbrinds[type] != 0)
		(void) strcpy(chars, &chars[abbrinds[type]]);
	abbrinds[0] = 0;
	charcnt = strlen(chars) + 1;
	typecnt = 1;
	timecnt = 0;
	type = 0;
}
attypes = growalloc(attypes, sizeof *attypes, timecnt, &timecnt_alloc);
attypes[timecnt].at = starttime;
attypes[timecnt].type = type;
++timecnt;
}

static int
#ifdef ICU
addtype(const zic_t gmtoff, const zic_t rawoff, const zic_t dstoff, char *const abbr, const int isdst,
const int ttisstd, const int ttisgmt)
#else
addtype(const zic_t gmtoff, const char *const abbr, const int isdst,
const int ttisstd, const int ttisgmt)
#endif
{
register int	i, j;

if (isdst != true && isdst != false) {
	error(_("internal error - addtype called with bad isdst"));
	exit(EXIT_FAILURE);
}
if (ttisstd != true && ttisstd != false) {
	error(_("internal error - addtype called with bad ttisstd"));
	exit(EXIT_FAILURE);
}
if (ttisgmt != true && ttisgmt != false) {
	error(_("internal error - addtype called with bad ttisgmt"));
	exit(EXIT_FAILURE);
}
#ifdef ICU
if (isdst != (dstoff != 0)) {
	error(_("internal error - addtype called with bad isdst/dstoff"));
	exit(EXIT_FAILURE);
}
if (gmtoff != (rawoff + dstoff)) {
	error(_("internal error - addtype called with bad gmt/raw/dstoff"));
	exit(EXIT_FAILURE);
}
#endif
/*
** See if there's already an entry for this zone type.
** If so, just return its index.
*/
for (i = 0; i < typecnt; ++i) {
	if (gmtoff == gmtoffs[i] && isdst == isdsts[i] &&
#ifdef ICU
		rawoff == rawoffs[i] && dstoff == dstoffs[i] &&
#endif
		strcmp(abbr, &chars[abbrinds[i]]) == 0 &&
		ttisstd == ttisstds[i] &&
		ttisgmt == ttisgmts[i])
			return i;
}
/*
** There isn't one; add a new one, unless there are already too
** many.
*/
if (typecnt >= TZ_MAX_TYPES) {
	error(_("too many local time types"));
	exit(EXIT_FAILURE);
}
if (! (-1L - 2147483647L <= gmtoff && gmtoff <= 2147483647L)) {
	error(_("UT offset out of range"));
	exit(EXIT_FAILURE);
}
gmtoffs[i] = gmtoff;
#ifdef ICU
rawoffs[i] = rawoff;
dstoffs[i] = dstoff;
#endif
isdsts[i] = isdst;
ttisstds[i] = ttisstd;
ttisgmts[i] = ttisgmt;

for (j = 0; j < charcnt; ++j)
	if (strcmp(&chars[j], abbr) == 0)
		break;
if (j == charcnt)
	newabbr(abbr);
abbrinds[i] = j;
++typecnt;
return i;
}

static void
leapadd(const zic_t t, const int positive, const int rolling, int count)
{
register int	i, j;

if (leapcnt + (positive ? count : 1) > TZ_MAX_LEAPS) {
	error(_("too many leap seconds"));
	exit(EXIT_FAILURE);
}
for (i = 0; i < leapcnt; ++i)
	if (t <= trans[i]) {
		if (t == trans[i]) {
			error(_("repeated leap second moment"));
			exit(EXIT_FAILURE);
		}
		break;
	}
do {
	for (j = leapcnt; j > i; --j) {
		trans[j] = trans[j - 1];
		corr[j] = corr[j - 1];
		roll[j] = roll[j - 1];
	}
	trans[i] = t;
	corr[i] = positive ? 1 : -count;
	roll[i] = rolling;
	++leapcnt;
} while (positive && --count != 0);
}

static void
adjleap(void)
{
register int	i;
register zic_t	last = 0;

/*
** propagate leap seconds forward
*/
for (i = 0; i < leapcnt; ++i) {
	trans[i] = tadd(trans[i], last);
	last = corr[i] += last;
}
}

static int
yearistype(const int year, const char *const type)
{
static char *	buf;
int		result;

if (type == NULL || *type == '\0')
	return true;
buf = erealloc(buf, 132 + strlen(yitcommand) + strlen(type));
(void) sprintf(buf, "%s %d %s", yitcommand, year, type);
result = system(buf);
if (WIFEXITED(result)) switch (WEXITSTATUS(result)) {
	case 0:
		return true;
	case 1:
		return false;
}
error(_("Wild result from command execution"));
(void) fprintf(stderr, _("%s: command was '%s', result was %d\n"),
	progname, buf, result);
for ( ; ; )
	exit(EXIT_FAILURE);
}

static int
lowerit(int a)
{
a = (unsigned char) a;
return (isascii(a) && isupper(a)) ? tolower(a) : a;
}

/* case-insensitive equality */
static ATTRIBUTE_PURE int
ciequal(register const char *ap, register const char *bp)
{
while (lowerit(*ap) == lowerit(*bp++))
	if (*ap++ == '\0')
		return true;
return false;
}

static ATTRIBUTE_PURE int
itsabbr(register const char *abbr, register const char *word)
{
if (lowerit(*abbr) != lowerit(*word))
	return false;
++word;
while (*++abbr != '\0')
	do {
		if (*word == '\0')
			return false;
	} while (lowerit(*word++) != lowerit(*abbr));
return true;
}

static ATTRIBUTE_PURE const struct lookup *
byword(register const char *const word,
      register const struct lookup *const table)
{
register const struct lookup *	foundlp;
register const struct lookup *	lp;

if (word == NULL || table == NULL)
	return NULL;
/*
** Look for exact match.
*/
for (lp = table; lp->l_word != NULL; ++lp)
	if (ciequal(word, lp->l_word))
		return lp;
/*
** Look for inexact match.
*/
foundlp = NULL;
for (lp = table; lp->l_word != NULL; ++lp)
	if (itsabbr(word, lp->l_word)) {
		if (foundlp == NULL)
			foundlp = lp;
		else	return NULL;	/* multiple inexact matches */
	}
return foundlp;
}

static char **
getfields(register char *cp)
{
register char *		dp;
register char **	array;
register int		nsubs;

if (cp == NULL)
	return NULL;
array = emalloc(size_product(strlen(cp) + 1, sizeof *array));
nsubs = 0;
for ( ; ; ) {
	while (isascii((unsigned char) *cp) &&
		isspace((unsigned char) *cp))
			++cp;
	if (*cp == '\0' || *cp == '#')
		break;
	array[nsubs++] = dp = cp;
	do {
		if ((*dp = *cp++) != '"')
			++dp;
		else while ((*dp = *cp++) != '"')
			if (*dp != '\0')
				++dp;
			else {
				error(_(
					"Odd number of quotation marks"
					));
				exit(1);
			}
	} while (*cp != '\0' && *cp != '#' &&
		(!isascii(*cp) || !isspace((unsigned char) *cp)));
	if (isascii(*cp) && isspace((unsigned char) *cp))
		++cp;
	*dp = '\0';
}
array[nsubs] = NULL;
return array;
}

static ATTRIBUTE_PURE zic_t
oadd(const zic_t t1, const zic_t t2)
{
if (t1 < 0 ? t2 < ZIC_MIN - t1 : ZIC_MAX - t1 < t2) {
	error(_("time overflow"));
	exit(EXIT_FAILURE);
}
return t1 + t2;
}

static ATTRIBUTE_PURE zic_t
tadd(const zic_t t1, const zic_t t2)
{
if (t1 == max_time && t2 > 0)
	return max_time;
if (t1 == min_time && t2 < 0)
	return min_time;
if (t1 < 0 ? t2 < min_time - t1 : max_time - t1 < t2) {
	error(_("time overflow"));
	exit(EXIT_FAILURE);
}
return t1 + t2;
}

/*
** Given a rule, and a year, compute the date - in seconds since January 1,
** 1970, 00:00 LOCAL time - in that year that the rule refers to.
*/

static zic_t
rpytime(register const struct rule *const rp, register const zic_t wantedy)
{
register int	m, i;
register zic_t	dayoff;			/* with a nod to Margaret O. */
register zic_t	t, y;

if (wantedy == ZIC_MIN)
	return min_time;
if (wantedy == ZIC_MAX)
	return max_time;
dayoff = 0;
m = TM_JANUARY;
y = EPOCH_YEAR;
while (wantedy != y) {
	if (wantedy > y) {
		i = len_years[isleap(y)];
		++y;
	} else {
		--y;
		i = -len_years[isleap(y)];
	}
	dayoff = oadd(dayoff, i);
}
while (m != rp->r_month) {
	i = len_months[isleap(y)][m];
	dayoff = oadd(dayoff, i);
	++m;
}
i = rp->r_dayofmonth;
if (m == TM_FEBRUARY && i == 29 && !isleap(y)) {
	if (rp->r_dycode == DC_DOWLEQ)
		--i;
	else {
		error(_("use of 2/29 in non leap-year"));
		exit(EXIT_FAILURE);
	}
}
--i;
dayoff = oadd(dayoff, i);
if (rp->r_dycode == DC_DOWGEQ || rp->r_dycode == DC_DOWLEQ) {
	register zic_t	wday;

#define LDAYSPERWEEK	((zic_t) DAYSPERWEEK)
	wday = EPOCH_WDAY;
	/*
	** Don't trust mod of negative numbers.
	*/
	if (dayoff >= 0)
		wday = (wday + dayoff) % LDAYSPERWEEK;
	else {
		wday -= ((-dayoff) % LDAYSPERWEEK);
		if (wday < 0)
			wday += LDAYSPERWEEK;
	}
	while (wday != rp->r_wday)
		if (rp->r_dycode == DC_DOWGEQ) {
			dayoff = oadd(dayoff, 1);
			if (++wday >= LDAYSPERWEEK)
				wday = 0;
			++i;
		} else {
			dayoff = oadd(dayoff, -1);
			if (--wday < 0)
				wday = LDAYSPERWEEK - 1;
			--i;
		}
	if (i < 0 || i >= len_months[isleap(y)][m]) {
		if (noise)
			warning(_("rule goes past start/end of month--\
will not work with pre-2004 versions of zic"));
	}
}
if (dayoff < min_time / SECSPERDAY)
	return min_time;
if (dayoff > max_time / SECSPERDAY)
	return max_time;
t = (zic_t) dayoff * SECSPERDAY;
return tadd(t, rp->r_tod);
}

static void
newabbr(const char *const string)
{
register int	i;

if (strcmp(string, GRANDPARENTED) != 0) {
	register const char *	cp;
	const char *		mp;

	/*
	** Want one to ZIC_MAX_ABBR_LEN_WO_WARN alphabetics
	** optionally followed by a + or - and a number from 1 to 14.
	*/
	cp = string;
	mp = NULL;
	while (isascii((unsigned char) *cp) &&
		isalpha((unsigned char) *cp))
			++cp;
	if (cp - string == 0)
mp = _("time zone abbreviation lacks alphabetic at start");
	if (noise && cp - string < 3)
mp = _("time zone abbreviation has fewer than 3 alphabetics");
	if (cp - string > ZIC_MAX_ABBR_LEN_WO_WARN)
mp = _("time zone abbreviation has too many alphabetics");
	if (mp == NULL && (*cp == '+' || *cp == '-')) {
		++cp;
		if (isascii((unsigned char) *cp) &&
			isdigit((unsigned char) *cp))
				if (*cp++ == '1' &&
					*cp >= '0' && *cp <= '4')
						++cp;
	}
	if (*cp != '\0')
mp = _("time zone abbreviation differs from POSIX standard");
	if (mp != NULL)
		warning("%s (%s)", mp, string);
}
i = strlen(string) + 1;
if (charcnt + i > TZ_MAX_CHARS) {
	error(_("too many, or too long, time zone abbreviations"));
	exit(EXIT_FAILURE);
}
(void) strcpy(&chars[charcnt], string);
charcnt += i;
}

static int
mkdirs(char *argname)
{
register char *	name;
register char *	cp;

if (argname == NULL || *argname == '\0')
	return 0;
cp = name = ecpyalloc(argname);
while ((cp = strchr(cp + 1, '/')) != 0) {
	*cp = '\0';
#ifdef HAVE_DOS_FILE_NAMES
	/*
	** DOS drive specifier?
	*/
	if (isalpha((unsigned char) name[0]) &&
		name[1] == ':' && name[2] == '\0') {
			*cp = '/';
			continue;
	}
#endif
	if (!itsdir(name)) {
		/*
		** It doesn't seem to exist, so we try to create it.
		** Creation may fail because of the directory being
		** created by some other multiprocessor, so we get
		** to do extra checking.
		*/
		if (mkdir(name, MKDIR_UMASK) != 0) {
			const char *e = strerror(errno);

			if (errno != EEXIST || !itsdir(name)) {
				(void) fprintf(stderr,
_("%s: Can't create directory %s: %s\n"),
					progname, name, e);
				free(name);
				return -1;
			}
		}
	}
	*cp = '/';
}
free(name);
return 0;
}

/*
** UNIX was a registered trademark of The Open Group in 2003.
*/