Subject:  v18i113:  Table-driven ctime/time/localtime/date package, Part03/07
Newsgroups: comp.sources.unix
Sender: sources
Approved: rsalz@uunet.UU.NET

Submitted-by:  ado@ncifcrf.gov
Posting-number: Volume 18, Issue 113
Archive-name: localtime3/part03

: To unbundle, sh this file
echo file 'zic.c' >&2
cat >'zic.c' <<'End of zic.c'
#ifndef lint
#ifndef NOID
static char	elsieid[] = "@(#)zic.c	7.1";
#endif /* !defined NOID */
#endif /* !defined lint */

#include "private.h"
#include "tzfile.h"

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

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

	int		r_month;	/* 0..11 */

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

	long		r_tod;		/* time from midnight */
	int		r_todisstd;	/* above is standard time if TRUE */
					/* or wall clock time if FALSE */
	long		r_stdoff;	/* offset from standard time */
	const char *	r_abbrvar;	/* variable part of abbreviation */

	int		r_todo;		/* a rule to do (used in outzone) */
	time_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;
	long		z_gmtoff;
	const char *	z_rule;
	const char *	z_format;

	long		z_stdoff;

	struct rule *	z_rules;
	int		z_nrules;

	struct rule	z_untilrule;
	time_t		z_untiltime;
};

extern int	emkdir P((const char * name, int mode));
extern int	getopt P((int argc, char * argv[], const char * options));
extern char *	icatalloc P((char * old, const char * new));
extern char *	icpyalloc P((const char * string));
extern void	ifree P((char * p));
extern char *	imalloc P((int n));
extern char *	irealloc P((char * old, int n));
extern int	link P((const char * fromname, const char * toname));
extern char *	optarg;
extern int	optind;
extern char *	scheck P((const char * string, const char * format));

static void	addtt P((time_t starttime, int type));
static int	addtype P((long gmtoff, const char * abbr, int isdst,
    int ttisstd));
static void	addleap P((time_t t, int positive, int rolling));
static void	adjleap P((void));
static void	associate P((void));
static int	ciequal P((const char * ap, const char * bp));
static void	convert P((long val, char * buf));
static void	dolink P((const char * fromfile, const char * tofile));
static void	eat P((const char * name, int num));
static void	eats P((const char * name, int num,
			const char * rname, int rnum));
static long	eitol P((int i));
static void	error P((const char * message));
static char **	getfields P((char * buf));
static long	gethms P((const char * string, const char * errstrng,
			int signable));
static void	infile P((const char * filename));
static void	inleap P((char ** fields, int nfields));
static void	inlink P((char ** fields, int nfields));
static void	inrule P((char ** fields, int nfields));
static int	inzcont P((char ** fields, int nfields));
static int	inzone P((char ** fields, int nfields));
static int	inzsub P((char ** fields, int nfields, int iscont));
static int	itsabbr P((const char * abbr, const char * word));
static int	itsdir P((const char * name));
static int	lowerit P((int c));
static char *	memcheck P((char * tocheck));
static int	mkdirs P((char * filename));
static void	newabbr P((const char * abbr));
static long	oadd P((long t1, long t2));
static void	outzone P((const struct zone * zp, int ntzones));
static void	puttzcode P((long code, FILE * fp));
static int	rcomp P((const genericptr_t leftp, const genericptr_t rightp));
static time_t	rpytime P((const struct rule * rp, int wantedy));
static void	rulesub P((struct rule * rp,
			char * loyearp, char * hiyearp,
			char * typep, char * monthp,
			char * dayp, char * timep));
static void	setboundaries P((void));
static time_t	tadd P((time_t t1, long t2));
static void	usage P((void));
static void	writezone P((const char * name));
static int	yearistype P((int year, const char * type));

static int		charcnt;
static int		errors;
static const char *	filename;
static int		leapcnt;
static int		linenum;
static time_t		max_time;
static int		max_year;
static time_t		min_time;
static int		min_year;
static int		noise;
static const char *	rfilename;
static int		rlinenum;
static const char *	progname;
static int		timecnt;
static int		typecnt;
static int		tt_signed;

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

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

static struct link *	links;
static int		nlinks;

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

static struct lookup const *	byword P((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 time_t		ats[TZ_MAX_TIMES];
static unsigned char	types[TZ_MAX_TIMES];
static long		gmtoffs[TZ_MAX_TYPES];
static char		isdsts[TZ_MAX_TYPES];
static char		abbrinds[TZ_MAX_TYPES];
static char		ttisstds[TZ_MAX_TYPES];
static char		chars[TZ_MAX_CHARS];
static time_t		trans[TZ_MAX_LEAPS];
static long		corr[TZ_MAX_LEAPS];
static char		roll[TZ_MAX_LEAPS];

/*
** Memory allocation.
*/

static char *
memcheck(ptr)
char * const	ptr;
{
	if (ptr == NULL) {
		(void) perror(progname);
		(void) exit(EXIT_FAILURE);
	}
	return ptr;
}

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

/*
** Error handling.
*/

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

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

static void
usage()
{
	(void) fprintf(stderr,
"%s: usage is %s [ -s ] [ -v ] [ -l localtime ] [ -p posixrules ] [ -d directory ]\n\
\t[ -L leapseconds ] [ filename ... ]\n",
		progname, progname);
	(void) exit(EXIT_FAILURE);
}

static const char *	psxrules;
static const char *	lcltime;
static const char *	directory;
static const char *	leapsec;
static int		sflag = FALSE;

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

#ifdef unix
	(void) umask(umask(022) | 022);
#endif /* defined unix */
	progname = argv[0];
	while ((c = getopt(argc, argv, "d:l:p:L:vs")) != EOF)
		switch (c) {
			default:
				usage();
			case 'd':
				if (directory == NULL)
					directory = optarg;
				else {
					(void) fprintf(stderr,
"%s: More than one -d option specified\n",
						progname);
					(void) exit(EXIT_FAILURE);
				}
				break;
			case 'l':
				if (lcltime == NULL)
					lcltime = optarg;
				else {
					(void) fprintf(stderr,
"%s: More than one -l option specified\n",
						progname);
					(void) exit(EXIT_FAILURE);
				}
				break;
			case 'p':
				if (psxrules == NULL)
					psxrules = optarg;
				else {
					(void) fprintf(stderr,
"%s: More than one -p option specified\n",
						progname);
					(void) exit(EXIT_FAILURE);
				}
				break;
			case 'L':
				if (leapsec == NULL)
					leapsec = optarg;
				else {
					(void) fprintf(stderr,
"%s: More than one -L option specified\n",
						progname);
					(void) exit(EXIT_FAILURE);
				}
				break;
			case 'v':
				noise = TRUE;
				break;
			case 's':
				sflag = TRUE;
				break;
		}
	if (optind == argc - 1 && strcmp(argv[optind], "=") == 0)
		usage();	/* usage message by request */
	if (directory == NULL)
		directory = TZDIR;

	setboundaries();

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

	zones = (struct zone *) emalloc(0);
	rules = (struct rule *) emalloc(0);
	links = (struct link *) emalloc(0);
	for (i = optind; i < argc; ++i)
		infile(argv[i]);
	if (errors)
		(void) 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)
			;
		outzone(&zones[i], j - i);
	}
	/*
	** Make links.
	*/
	for (i = 0; i < nlinks; ++i)
		dolink(links[i].l_from, links[i].l_to);
	if (lcltime != NULL)
		dolink(lcltime, TZDEFAULT);
	if (psxrules != NULL)
		dolink(psxrules, TZDEFRULES);
	return (errors == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
}

static void
dolink(fromfile, tofile)
const char * const	fromfile;
const char * const	tofile;
{
	register char *	fromname;
	register char *	toname;

	fromname = ecpyalloc(directory);
	fromname = ecatalloc(fromname, "/");
	fromname = ecatalloc(fromname, fromfile);
	toname = ecpyalloc(directory);
	toname = ecatalloc(toname, "/");
	toname = ecatalloc(toname, tofile);
	/*
	** 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) {
		(void) fprintf(stderr, "%s: Can't link from %s to ",
			progname, fromname);
		(void) perror(toname);
		(void) exit(EXIT_FAILURE);
	}
	ifree(fromname);
	ifree(toname);
}

static void
setboundaries()
{
	register time_t	bit;

	for (bit = 1; bit > 0; bit <<= 1)
		;
	if (bit == 0) {		/* time_t is an unsigned type */
		tt_signed = FALSE;
		min_time = 0;
		max_time = ~(time_t) 0;
		if (sflag)
			max_time >>= 1;
	} else {
		tt_signed = TRUE;
		min_time = bit;
		max_time = bit;
		++max_time;
		max_time = -max_time;
		if (sflag)
			min_time = 0;
	}
	min_year = TM_YEAR_BASE + gmtime(&min_time)->tm_year;
	max_year = TM_YEAR_BASE + gmtime(&max_time)->tm_year;
}

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

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

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

/*
** Sort by rule name.
*/

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

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

	if (nrules != 0)
		(void) qsort((genericptr_t) rules,
			(qsort_size_t) nrules,
			(qsort_size_t) sizeof *rules, rcomp);
	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 in ruleless zone");
		}
	}
	if (errors)
		(void) exit(EXIT_FAILURE);
}

static void
infile(name)
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) {
		(void) fprintf(stderr, "%s: Can't open ", progname);
		(void) perror(name);
		(void) exit(EXIT_FAILURE);
	}
	wantcont = FALSE;
	for (num = 1; ; ++num) {
		eat(name, num);
		if (fgets(buf, (int) sizeof buf, fp) != buf)
			break;
		cp = strchr(buf, '\n');
		if (cp == NULL) {
			error("line too long");
			(void) exit(EXIT_FAILURE);
		}
		*cp = '\0';
		fields = getfields(buf);
		nfields = 0;
		while (fields[nfields] != NULL) {
			if (ciequal(fields[nfields], "-"))
				fields[nfields] = "";
			++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);
					(void) exit(EXIT_FAILURE);
			}
		}
		ifree((char *) fields);
	}
	if (ferror(fp)) {
		(void) fprintf(stderr, "%s: Error reading ", progname);
		(void) perror(filename);
		(void) exit(EXIT_FAILURE);
	}
	if (fp != stdin && fclose(fp)) {
		(void) fprintf(stderr, "%s: Error closing ", progname);
		(void) perror(filename);
		(void) 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 long
gethms(string, errstring, signable)
const char *		string;
const char * const	errstring;
const int		signable;
{
	int	hh, 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, "%d"), &hh) == 1)
		mm = ss = 0;
	else if (sscanf(string, scheck(string, "%d:%d"), &hh, &mm) == 2)
		ss = 0;
	else if (sscanf(string, scheck(string, "%d:%d:%d"),
		&hh, &mm, &ss) != 3) {
			error(errstring);
			return 0;
	}
	if (hh < 0 || hh >= HOURSPERDAY ||
		mm < 0 || mm >= MINSPERHOUR ||
		ss < 0 || ss > SECSPERMIN) {
			error(errstring);
			return 0;
	}
	return eitol(sign) *
		(eitol(hh * MINSPERHOUR + mm) *
		eitol(SECSPERMIN) + eitol(ss));
}

static void
inrule(fields, nfields)
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]);
	rules = (struct rule *) erealloc((char *) rules,
		(int) ((nrules + 1) * sizeof *rules));
	rules[nrules++] = r;
}

static int
inzone(fields, nfields)
register char ** const	fields;
const int		nfields;
{
	register int	i;
	char		buf[132];

	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) {
		(void) sprintf(buf,
			"\"Zone %s\" line and -l option are mutually exclusive",
			TZDEFAULT);
		error(buf);
		return FALSE;
	}
	if (strcmp(fields[ZF_NAME], TZDEFRULES) == 0 && psxrules != NULL) {
		(void) sprintf(buf,
			"\"Zone %s\" line and -p option are mutually exclusive",
			TZDEFRULES);
		error(buf);
		return FALSE;
	}
	for (i = 0; i < nzones; ++i)
		if (zones[i].z_name != NULL &&
			strcmp(zones[i].z_name, fields[ZF_NAME]) == 0) {
				(void) sprintf(buf,
"duplicate zone name %s (file \"%s\", line %d)",
					fields[ZF_NAME],
					zones[i].z_filename,
					zones[i].z_linenum);
				error(buf);
				return FALSE;
		}
	return inzsub(fields, nfields, FALSE);
}

static int
inzcont(fields, nfields)
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(fields, nfields, iscont)
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 GMT 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]);
	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 < max_time &&
			z.z_untiltime > min_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 = (struct zone *) erealloc((char *) zones,
		(int) ((nzones + 1) * sizeof *zones));
	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(fields, nfields)
register char ** const	fields;
const int		nfields;
{
	register const char *		cp;
	register const struct lookup *	lp;
	register int			i, j;
	int				year, month, day;
	long				dayoff, tod;
	time_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, "%d"), &year) != 1 ||
		year < min_year || year > max_year) {
			/*
			 * Leapin' Lizards!
			 */
			error("invalid leaping year");
			return;
	}
	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, eitol(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, eitol(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, eitol(day - 1));
	if (dayoff < 0 && !tt_signed) {
		error("time before zero");
		return;
	}
	t = (time_t) dayoff * SECSPERDAY;
	/*
	** Cheap overflow check.
	*/
	if (t / SECSPERDAY != dayoff) {
		error("time overflow");
		return;
	}
	tod = gethms(fields[LP_TIME], "invalid time of day", FALSE);
	cp = fields[LP_CORR];
	if (strcmp(cp, "+") != 0 && strcmp(cp, "") != 0) {
		/* infile() turned "-" into "" */
		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;
	}
	addleap(tadd(t, tod), *cp == '+', lp->l_value);
}

static void
inlink(fields, nfields)
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 = (struct link *) erealloc((char *) links,
		(int) ((nlinks + 1) * sizeof *links));
	links[nlinks++] = l;
}

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

	if ((lp = byword(monthp, mon_names)) == NULL) {
		error("invalid month name");
		return;
	}
	rp->r_month = lp->l_value;
	rp->r_todisstd = FALSE;
	cp = timep;
	if (*cp != '\0') {
		cp += strlen(cp) - 1;
		switch (lowerit(*cp)) {
			case 's':
				rp->r_todisstd = TRUE;
				*cp = '\0';
				break;
			case 'w':
				rp->r_todisstd = FALSE;
				*cp = '\0';
				break;
		}
	}
	rp->r_tod = gethms(timep, "invalid time of day", FALSE);
	/*
	** Year work.
	*/
	cp = loyearp;
	if ((lp = byword(cp, begin_years)) != NULL) switch ((int) lp->l_value) {
		case YR_MINIMUM:
			rp->r_loyear = min_year;
			break;
		case YR_MAXIMUM:
			rp->r_loyear = max_year;
			break;
		default:	/* "cannot happen" */
			(void) fprintf(stderr,
				"%s: panic: Invalid l_value %d\n",
				progname, lp->l_value);
			(void) exit(EXIT_FAILURE);
	} else if (sscanf(cp, scheck(cp, "%d"), &rp->r_loyear) != 1 ||
		rp->r_loyear < min_year || rp->r_loyear > max_year) {
			if (noise)
				error("invalid starting year");
			if (rp->r_loyear > max_year)
				return;
	}
	cp = hiyearp;
	if ((lp = byword(cp, end_years)) != NULL) switch ((int) lp->l_value) {
		case YR_MINIMUM:
			rp->r_hiyear = min_year;
			break;
		case YR_MAXIMUM:
			rp->r_hiyear = max_year;
			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);
			(void) exit(EXIT_FAILURE);
	} else if (sscanf(cp, scheck(cp, "%d"), &rp->r_hiyear) != 1 ||
		rp->r_hiyear < min_year || rp->r_hiyear > max_year) {
			if (noise)
				error("invalid ending year");
			if (rp->r_hiyear < min_year)
				return;
	}
	if (rp->r_hiyear < min_year)
 		return;
 	if (rp->r_loyear < min_year)
 		rp->r_loyear = min_year;
 	if (rp->r_hiyear > max_year)
 		rp->r_hiyear = max_year;
	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
	*/
	if ((lp = byword(dayp, lasts)) != NULL) {
		rp->r_dycode = DC_DOWLEQ;
		rp->r_wday = lp->l_value;
		rp->r_dayofmonth = len_months[1][rp->r_month];
	} else {
		if ((cp = strchr(dayp, '<')) != 0)
			rp->r_dycode = DC_DOWLEQ;
		else if ((cp = strchr(dayp, '>')) != 0)
			rp->r_dycode = DC_DOWGEQ;
		else {
			cp = dayp;
			rp->r_dycode = DC_DOM;
		}
		if (rp->r_dycode != DC_DOM) {
			*cp++ = 0;
			if (*cp++ != '=') {
				error("invalid day of month");
				return;
			}
			if ((lp = byword(dayp, wday_names)) == NULL) {
				error("invalid weekday name");
				return;
			}
			rp->r_wday = lp->l_value;
		}
		if (sscanf(cp, scheck(cp, "%d"), &rp->r_dayofmonth) != 1 ||
			rp->r_dayofmonth <= 0 ||
			(rp->r_dayofmonth > len_months[1][rp->r_month])) {
				error("invalid day of month");
				return;
		}
	}
}

static void
convert(val, buf)
const long	val;
char * const	buf;
{
	register int	i;
	register long	shift;

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

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

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

static void
writezone(name)
const char * const	name;
{
	register FILE *		fp;
	register int		i, j;
	char			fullname[BUFSIZ];
	static struct tzhead	tzh;

	if (strlen(directory) + 1 + strlen(name) >= sizeof fullname) {
		(void) fprintf(stderr,
			"%s: File name %s/%s too long\n", progname,
			directory, name);
		(void) exit(EXIT_FAILURE);
	}
	(void) sprintf(fullname, "%s/%s", directory, name);
	if ((fp = fopen(fullname, "wb")) == NULL) {
		if (mkdirs(fullname) != 0)
			(void) exit(EXIT_FAILURE);
		if ((fp = fopen(fullname, "wb")) == NULL) {
			(void) fprintf(stderr, "%s: Can't create ", progname);
			(void) perror(fullname);
			(void) exit(EXIT_FAILURE);
		}
	}
	convert(eitol(typecnt), tzh.tzh_ttisstdcnt);
	convert(eitol(leapcnt), tzh.tzh_leapcnt);
	convert(eitol(timecnt), tzh.tzh_timecnt);
	convert(eitol(typecnt), tzh.tzh_typecnt);
	convert(eitol(charcnt), tzh.tzh_charcnt);
	(void) fwrite((genericptr_t) &tzh,
		(fwrite_size_t) sizeof tzh,
		(fwrite_size_t) 1, fp);
	for (i = 0; i < timecnt; ++i) {
		j = leapcnt;
		while (--j >= 0)
			if (ats[i] >= trans[j]) {
				ats[i] = tadd(ats[i], corr[j]);
				break;
			}
		puttzcode((long) ats[i], fp);
	}
	if (timecnt > 0)
		(void) fwrite((genericptr_t) types,
			(fwrite_size_t) sizeof types[0],
			(fwrite_size_t) timecnt, fp);
	for (i = 0; i < typecnt; ++i) {
		puttzcode((long) gmtoffs[i], fp);
		(void) putc(isdsts[i], fp);
		(void) putc(abbrinds[i], fp);
	}
	if (charcnt != 0)
		(void) fwrite((genericptr_t) chars,
			(fwrite_size_t) sizeof chars[0],
			(fwrite_size_t) charcnt, fp);
	for (i = 0; i < leapcnt; ++i) {
		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];
			}
			puttzcode((long) tadd(trans[i], -gmtoffs[j]), fp);
		} else	puttzcode((long) trans[i], fp);
		puttzcode((long) corr[i], fp);
	}
	for (i = 0; i < typecnt; ++i)
		(void) putc(ttisstds[i], fp);
	if (ferror(fp) || fclose(fp)) {
		(void) fprintf(stderr, "%s: Write error on ", progname);
		(void) perror(fullname);
		(void) exit(EXIT_FAILURE);
	}
}

static void
outzone(zpfirst, zonecount)
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 time_t			starttime, untiltime;
	register long			gmtoff;
	register long			stdoff;
	register int			year;
	register long			startoff;
	register int			startisdst;
	register int			startttisstd;
	register int			type;
	char				startbuf[BUFSIZ];

	/*
	** Now. . .finally. . .generate some useful data!
	*/
	timecnt = 0;
	typecnt = 0;
	charcnt = 0;
	/*
	** Two guesses. . .the second may well be corrected later.
	*/
	gmtoff = zpfirst->z_gmtoff;
	stdoff = 0;
#ifdef lint
	starttime = 0;
	startttisstd = FALSE;
#endif /* defined lint */
	for (i = 0; i < zonecount; ++i) {
		usestart = i > 0;
		useuntil = i < (zonecount - 1);
		zp = &zpfirst[i];
		eat(zp->z_filename, zp->z_linenum);
		startisdst = -1;
		if (zp->z_nrules == 0) {
			type = addtype(oadd(zp->z_gmtoff, zp->z_stdoff),
				zp->z_format, zp->z_stdoff != 0,
				startttisstd);
			if (usestart)
				addtt(starttime, type);
			gmtoff = zp->z_gmtoff;
			stdoff = zp->z_stdoff;
		} 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 time_t	jtime, ktime;
				register long	offset;
				char		buf[BUFSIZ];

				if (useuntil) {
					/*
					** Turn untiltime into GMT
					** assuming the current gmtoff and
					** stdoff values.
					*/
					offset = gmtoff;
					if (!zp->z_untilrule.r_todisstd)
						offset = oadd(offset, stdoff);
					untiltime = tadd(zp->z_untiltime,
						-offset);
				}
				/*
				** Find the rule (of those to do, if any)
				** that takes effect earliest in the year.
				*/
				k = -1;
#ifdef lint
				ktime = 0;
#endif /* defined lint */
				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 = 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;
				if (usestart) {
					if (ktime < starttime) {
						stdoff = rp->r_stdoff;
						startoff = oadd(zp->z_gmtoff,
							rp->r_stdoff);
						(void) sprintf(startbuf,
							zp->z_format,
							rp->r_abbrvar);
						startisdst =
							rp->r_stdoff != 0;
						continue;
					}
					if (ktime != starttime &&
						startisdst >= 0)
addtt(starttime, addtype(startoff, startbuf, startisdst, startttisstd));
					usestart = FALSE;
				}
				eats(zp->z_filename, zp->z_linenum,
					rp->r_filename, rp->r_linenum);
				(void) sprintf(buf, zp->z_format,
					rp->r_abbrvar);
				offset = oadd(zp->z_gmtoff, rp->r_stdoff);
				type = addtype(offset, buf, rp->r_stdoff != 0,
					rp->r_todisstd);
				if (timecnt != 0 || rp->r_stdoff != 0)
					addtt(ktime, type);
				gmtoff = zp->z_gmtoff;
				stdoff = rp->r_stdoff;
			}
		}
		/*
		** Now we may get to set starttime for the next zone line.
		*/
		if (useuntil) {
			starttime = tadd(zp->z_untiltime,
				-gmtoffs[types[timecnt - 1]]);
			startttisstd = zp->z_untilrule.r_todisstd;
		}
	}
	writezone(zpfirst->z_name);
}

static void
addtt(starttime, type)
const time_t	starttime;
const int	type;
{
	if (timecnt != 0 && type == types[timecnt - 1])
		return;	/* easy enough! */
	if (timecnt >= TZ_MAX_TIMES) {
		error("too many transitions?!");
		(void) exit(EXIT_FAILURE);
	}
	ats[timecnt] = starttime;
	types[timecnt] = type;
	++timecnt;
}

static int
addtype(gmtoff, abbr, isdst, ttisstd)
const long		gmtoff;
const char * const	abbr;
const int		isdst;
const int		ttisstd;
{
	register int	i, j;

	/*
	** 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] &&
			strcmp(abbr, &chars[abbrinds[i]]) == 0 &&
			ttisstd == ttisstds[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");
		(void) exit(EXIT_FAILURE);
	}
	gmtoffs[i] = gmtoff;
	isdsts[i] = isdst;
	ttisstds[i] = ttisstd;

	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
addleap(t, positive, rolling)
const time_t	t;
const int	positive;
const int	rolling;
{
	register int	i, j;

	if (leapcnt >= TZ_MAX_LEAPS) {
		error("too many leap seconds");
		(void) exit(EXIT_FAILURE);
	}
	for (i = 0; i < leapcnt; ++i)
		if (t <= trans[i]) {
			if (t == trans[i]) {
				error("repeated leap second moment");
				(void) exit(EXIT_FAILURE);
			}
			break;
		}
	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 ? 1L : -1L);
	roll[i] = rolling;
	++leapcnt;
}

static void
adjleap()
{
	register int	i;
	register long	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(year, type)
const int		year;
const char * const	type;
{
	char	buf[BUFSIZ];
	int	result;

	if (type == NULL || *type == '\0')
		return TRUE;
	if (strcmp(type, "uspres") == 0)
		return (year % 4) == 0;
	if (strcmp(type, "nonpres") == 0)
		return (year % 4) != 0;
	(void) sprintf(buf, "yearistype %d %s", year, type);
	result = system(buf);
	if (result == 0)
		return TRUE;
	if (result == (1 << 8))
		return FALSE;
	error("Wild result from command execution");
	(void) fprintf(stderr, "%s: command was '%s', result was %d\n",
		progname, buf, result);
	for ( ; ; )
		(void) exit(EXIT_FAILURE);
}

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

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

static int
itsabbr(abbr, word)
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 const struct lookup *
byword(word, table)
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(cp)
register char *	cp;
{
	register char *		dp;
	register char **	array;
	register int		nsubs;

	if (cp == NULL)
		return NULL;
	array = (char **) emalloc((int) ((strlen(cp) + 1) * sizeof *array));
	nsubs = 0;
	for ( ; ; ) {
		while (isascii(*cp) && isspace(*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");
		} while (*cp != '\0' && *cp != '#' &&
			(!isascii(*cp) || !isspace(*cp)));
		if (isascii(*cp) && isspace(*cp))
			++cp;
		*dp = '\0';
	}
	array[nsubs] = NULL;
	return array;
}

static long
oadd(t1, t2)
const long	t1;
const long	t2;
{
	register long	t;

	t = t1 + t2;
	if (t2 > 0 && t <= t1 || t2 < 0 && t >= t1) {
		error("time overflow");
		(void) exit(EXIT_FAILURE);
	}
	return t;
}

static time_t
tadd(t1, t2)
const time_t	t1;
const long	t2;
{
	register time_t	t;

	if (t1 == max_time && t2 > 0)
		return max_time;
	if (t1 == min_time && t2 < 0)
		return min_time;
	t = t1 + t2;
	if (t2 > 0 && t <= t1 || t2 < 0 && t >= t1) {
		error("time overflow");
		(void) exit(EXIT_FAILURE);
	}
	return t;
}

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

	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, eitol(i));
	}
	while (m != rp->r_month) {
		i = len_months[isleap(y)][m];
		dayoff = oadd(dayoff, eitol(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");
			(void) exit(EXIT_FAILURE);
		}
	}
	--i;
	dayoff = oadd(dayoff, eitol(i));
	if (rp->r_dycode == DC_DOWGEQ || rp->r_dycode == DC_DOWLEQ) {
		register long	wday;

#define LDAYSPERWEEK	((long) DAYSPERWEEK)
		wday = eitol(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 != eitol(rp->r_wday))
			if (rp->r_dycode == DC_DOWGEQ) {
				dayoff = oadd(dayoff, (long) 1);
				if (++wday >= LDAYSPERWEEK)
					wday = 0;
				++i;
			} else {
				dayoff = oadd(dayoff, (long) -1);
				if (--wday < 0)
					wday = LDAYSPERWEEK;
				--i;
			}
		if (i < 0 || i >= len_months[isleap(y)][m]) {
			error("no day in month matches rule");
			(void) exit(EXIT_FAILURE);
		}
	}
	if (dayoff < 0 && !tt_signed) {
		if (wantedy == rp->r_loyear)
			return min_time;
		error("time before zero");
		(void) exit(EXIT_FAILURE);
	}
	t = (time_t) dayoff * SECSPERDAY;
	/*
	** Cheap overflow check.
	*/
	if (t / SECSPERDAY != dayoff) {
		if (wantedy == rp->r_hiyear)
			return max_time;
		if (wantedy == rp->r_loyear)
			return min_time;
		error("time overflow");
		(void) exit(EXIT_FAILURE);
	}
	return tadd(t, rp->r_tod);
}

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

	i = strlen(string) + 1;
	if (charcnt + i >= TZ_MAX_CHARS) {
		error("too many, or too long, time zone abbreviations");
		(void) exit(EXIT_FAILURE);
	}
	(void) strcpy(&chars[charcnt], string);
	charcnt += eitol(i);
}

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

	if ((cp = name) == NULL || *cp == '\0')
		return 0;
	while ((cp = strchr(cp + 1, '/')) != 0) {
		*cp = '\0';
#ifndef unix
		/*
		** MS-DOS drive specifier?
		*/
		if (strlen(name) == 2 && isascii(name[0]) &&
			isalpha(name[0]) && name[1] == ':') {
				*cp = '/';
				continue;
		}
#endif /* !defined unix */
		if (!itsdir(name)) {
			/*
			** It doesn't seem to exist, so we try to create it.
			*/
			if (emkdir(name, 0755) != 0) {
				(void) fprintf(stderr,
					"%s: Can't create directory ",
					progname);
				(void) perror(name);
				return -1;
			}
		}
		*cp = '/';
	}
	return 0;
}

static long
eitol(i)
const int	i;
{
	long	l;

	l = i;
	if (i < 0 && l >= 0 || i == 0 && l != 0 || i > 0 && l <= 0) {
		(void) fprintf(stderr, "%s: %d did not sign extend correctly\n",
			progname, i);
		(void) exit(EXIT_FAILURE);
	}
	return l;
}

/*
** UNIX is a registered trademark of AT&T.
*/
End of zic.c
echo file 'zdump.c' >&2
cat >'zdump.c' <<'End of zdump.c'
#ifndef lint
#ifndef NOID
static char	elsieid[] = "@(#)zdump.c	7.1";
#endif /* !defined NOID */
#endif /* !defined lint */

/*
** This code has been made independent of the rest of the time
** conversion package to increase confidence in the verification it provides.
** You can use this code to help in verifying other implementations.
*/

#include "stdio.h"	/* for stdout, stderr */
#include "string.h"	/* for strcpy */
#include "sys/types.h"	/* for time_t */
#include "time.h"	/* for struct tm */

#ifndef MAX_STRING_LENGTH
#define MAX_STRING_LENGTH	1024
#endif /* !defined MAX_STRING_LENGTH */

#ifndef TRUE
#define TRUE		1
#endif /* !defined TRUE */

#ifndef FALSE
#define FALSE		0
#endif /* !defined FALSE */

#ifndef EXIT_SUCCESS
#define EXIT_SUCCESS	0
#endif /* !defined EXIT_SUCCESS */

#ifndef EXIT_FAILURE
#define EXIT_FAILURE	1
#endif /* !defined EXIT_FAILURE */

#ifndef SECSPERMIN
#define SECSPERMIN	60
#endif /* !defined SECSPERMIN */

#ifndef SECSPERHOUR
#define SECSPERHOUR	3600
#endif /* !defined SECSPERHOUR */

#ifndef HOURSPERDAY
#define HOURSPERDAY	24
#endif /* !defined HOURSPERDAY */

#ifndef EPOCH_YEAR
#define EPOCH_YEAR	1970
#endif /* !defined EPOCH_YEAR */

#ifndef DAYSPERNYEAR
#define DAYSPERNYEAR	365
#endif /* !defined DAYSPERNYEAR */

extern char **	environ;
extern int	getopt();
extern char *	optarg;
extern int	optind;
extern time_t	time();
extern char *	tzname[2];
extern void	tzset();

#ifdef USG
extern void	exit();
extern void	perror();
#endif /* defined USG */

static char *	abbr();
static long	delta();
static void	hunt();
static int	longest;
static char *	progname;
static void	show();

int
main(argc, argv)
int	argc;
char *	argv[];
{
	register int	i, c;
	register int	vflag;
	register char *	cutoff;
	register int	cutyear;
	register long	cuttime;
	time_t		now;
	time_t		t, newt;
	time_t		hibit;
	struct tm	tm, newtm;

	progname = argv[0];
	vflag = 0;
	cutoff = NULL;
	while ((c = getopt(argc, argv, "c:v")) == 'c' || c == 'v')
		if (c == 'v')
			vflag = 1;
		else	cutoff = optarg;
	if (c != EOF || optind == argc - 1 && strcmp(argv[optind], "=") == 0) {
		(void) fprintf(stderr,
			"%s: usage is %s [ -v ] [ -c cutoff ] zonename ...\n",
			argv[0], argv[0]);
		(void) exit(EXIT_FAILURE);
	}
	if (cutoff != NULL)
		cutyear = atoi(cutoff);
	/*
	** VERY approximate.
	*/
	cuttime = (long) (cutyear - EPOCH_YEAR) *
		SECSPERHOUR * HOURSPERDAY * DAYSPERNYEAR;
	(void) time(&now);
	longest = 0;
	for (i = optind; i < argc; ++i)
		if (strlen(argv[i]) > longest)
			longest = strlen(argv[i]);
	for (hibit = 1; (hibit << 1) != 0; hibit <<= 1)
		;
	for (i = optind; i < argc; ++i) {
		register char **	saveenv;
		static char		buf[MAX_STRING_LENGTH];
		char *			fakeenv[2];

		if (strlen(argv[i]) + 4 > sizeof buf) {
			(void) fflush(stdout);
			(void) fprintf(stderr, "%s: argument too long -- %s\n",
				progname, argv[i]);
			(void) exit(EXIT_FAILURE);
		}
		(void) strcpy(buf, "TZ=");
		(void) strcat(buf, argv[i]);
		fakeenv[0] = buf;
		fakeenv[1] = NULL;
		saveenv = environ;
		environ = fakeenv;
		(void) tzset();
		environ = saveenv;
		show(argv[i], now, FALSE);
		if (!vflag)
			continue;
		/*
		** Get lowest value of t.
		*/
		t = hibit;
		if (t > 0)		/* time_t is unsigned */
			t = 0;
		show(argv[i], t, TRUE);
		t += SECSPERHOUR * HOURSPERDAY;
		show(argv[i], t, TRUE);
		tm = *localtime(&t);
		(void) strncpy(buf, abbr(&tm), (sizeof buf) - 1);
		for ( ; ; ) {
			if (cutoff != NULL && t >= cuttime)
				break;
			newt = t + SECSPERHOUR * 12;
			if (cutoff != NULL && newt >= cuttime)
				break;
			if (newt <= t)
				break;
			newtm = *localtime(&newt);
			if (delta(&newtm, &tm) != (newt - t) ||
				newtm.tm_isdst != tm.tm_isdst ||
				strcmp(abbr(&newtm), buf) != 0) {
					hunt(argv[i], t, newt);
					(void) strncpy(buf, abbr(&newtm),
						(sizeof buf) - 1);
			}
			t = newt;
			tm = newtm;
		}
		/*
		** Get highest value of t.
		*/
		t = ~((time_t) 0);
		if (t < 0)		/* time_t is signed */
			t &= ~hibit;
		t -= SECSPERHOUR * HOURSPERDAY;
		show(argv[i], t, TRUE);
		t += SECSPERHOUR * HOURSPERDAY;
		show(argv[i], t, TRUE);
	}
	if (fflush(stdout) || ferror(stdout)) {
		(void) fprintf(stderr, "%s: Error writing standard output ",
			argv[0]);
		(void) perror("standard output");
		(void) exit(EXIT_FAILURE);
	}
	exit(EXIT_SUCCESS);

	/* gcc -Wall pacifier */
	for ( ; ; )
		;
}

static void
hunt(name, lot, hit)
char *	name;
time_t	lot;
time_t	hit;
{
	time_t		t;
	struct tm	lotm;
	struct tm	tm;
	static char	loab[MAX_STRING_LENGTH];

	lotm = *localtime(&lot);
	(void) strncpy(loab, abbr(&lotm), (sizeof loab) - 1);
	while ((hit - lot) >= 2) {
		t = lot / 2 + hit / 2;
		if (t <= lot)
			++t;
		else if (t >= hit)
			--t;
		tm = *localtime(&t);
		if (delta(&tm, &lotm) == (t - lot) &&
			tm.tm_isdst == lotm.tm_isdst &&
			strcmp(abbr(&tm), loab) == 0) {
				lot = t;
				lotm = tm;
		} else	hit = t;
	}
	show(name, lot, TRUE);
	show(name, hit, TRUE);
}

static long
delta(newp, oldp)
struct tm *	newp;
struct tm *	oldp;
{
	long	result;

	result = newp->tm_hour - oldp->tm_hour;
	if (result < 0)
		result += HOURSPERDAY;
	result *= SECSPERHOUR;
	result += (newp->tm_min - oldp->tm_min) * SECSPERMIN;
	return result + newp->tm_sec - oldp->tm_sec;
}

static void
show(zone, t, v)
char *	zone;
time_t	t;
int	v;
{
	struct tm *		tmp;
	extern struct tm *	localtime();

	(void) printf("%-*s  ", longest, zone);
	if (v)
		(void) printf("%.24s GMT = ", asctime(gmtime(&t)));
	tmp = localtime(&t);
	(void) printf("%.24s", asctime(tmp));
	if (*abbr(tmp) != '\0')
		(void) printf(" %s", abbr(tmp));
	if (v) {
		(void) printf(" isdst=%d", tmp->tm_isdst);
#ifdef TM_GMTOFF
		(void) printf(" gmtoff=%ld", tmp->TM_GMTOFF);
#endif /* defined TM_GMTOFF */
	}
	(void) printf("\n");
}

static char *
abbr(tmp)
struct tm *	tmp;
{
	register char *	result;

	if (tmp->tm_isdst != 0 && tmp->tm_isdst != 1)
		return "";
	result = tzname[tmp->tm_isdst];
	return (result == NULL) ? "" : result;
}
End of zdump.c
echo file 'scheck.c' >&2
cat >'scheck.c' <<'End of scheck.c'
#ifndef lint
#ifndef NOID
static char	elsieid[] = "@(#)scheck.c	8.10";
#endif /* !defined lint */
#endif /* !defined NOID */

/*LINTLIBRARY*/

#include "private.h"

extern char *	imalloc P((int n));
extern void	ifree P((char * p));

char *
scheck(string, format)
const char * const	string;
const char * const	format;
{
	register char *		fbuf;
	register const char *	fp;
	register char *		tp;
	register int		c;
	register char *		result;
	char			dummy;

	result = "";
	if (string == NULL || format == NULL)
		return result;
	fbuf = imalloc(2 * strlen(format) + 4);
	if (fbuf == NULL)
		return result;
	fp = format;
	tp = fbuf;
	while ((*tp++ = c = *fp++) != '\0') {
		if (c != '%')
			continue;
		if (*fp == '%') {
			*tp++ = *fp++;
			continue;
		}
		*tp++ = '*';
		if (*fp == '*')
			++fp;
		while (isascii(*fp) && isdigit(*fp))
			*tp++ = *fp++;
		if (*fp == 'l' || *fp == 'h')
			*tp++ = *fp++;
		else if (*fp == '[')
			do *tp++ = *fp++;
				while (*fp != '\0' && *fp != ']');
		if ((*tp++ = *fp++) == '\0')
			break;
	}
	*(tp - 1) = '%';
	*tp++ = 'c';
	*tp = '\0';
	if (sscanf(string, fbuf, &dummy) != 1)
		result = (char *) format;
	ifree(fbuf);
	return result;
}
End of scheck.c
echo file 'ialloc.c' >&2
cat >'ialloc.c' <<'End of ialloc.c'
#ifndef lint
#ifndef NOID
static char	elsieid[] = "@(#)ialloc.c	8.19";
#endif /* !defined NOID */
#endif /* !defined lint */

/*LINTLIBRARY*/

#include "private.h"

#ifdef MAL
#define NULLMAL(x)	((x) == NULL || (x) == MAL)
#else /* !defined MAL */
#define NULLMAL(x)	((x) == NULL)
#endif /* !defined MAL */

#define nonzero(n)	(((n) == 0) ? 1 : (n))

char *	icalloc P((int nelem, int elsize));
char *	icatalloc P((char * old, const char * new));
char *	icpyalloc P((const char * string));
char *	imalloc P((int n));
char *	irealloc P((char * pointer, int size));
void	ifree P((char * pointer));

char *
imalloc(n)
const int	n;
{
#ifdef MAL
	register char *	result;

	result = malloc((alloc_size_t) nonzero(n));
	return NULLMAL(result) ? NULL : result;
#else /* !defined MAL */
	return malloc((alloc_size_t) nonzero(n));
#endif /* !defined MAL */
}

char *
icalloc(nelem, elsize)
int	nelem;
int	elsize;
{
	if (nelem == 0 || elsize == 0)
		nelem = elsize = 1;
	return calloc((alloc_size_t) nelem, (alloc_size_t) elsize);
}

char *
irealloc(pointer, size)
char * const	pointer;
const int	size;
{
	if (NULLMAL(pointer))
		return imalloc(size);
	return realloc((genericptr_t) pointer, (alloc_size_t) nonzero(size));
}

char *
icatalloc(old, new)
char * const		old;
const char * const	new;
{
	register char *	result;
	register	oldsize, newsize;

	newsize = NULLMAL(new) ? 0 : strlen(new);
	if (NULLMAL(old))
		oldsize = 0;
	else if (newsize == 0)
		return old;
	else	oldsize = strlen(old);
	if ((result = irealloc(old, oldsize + newsize + 1)) != NULL)
		if (!NULLMAL(new))
			(void) strcpy(result + oldsize, new);
	return result;
}

char *
icpyalloc(string)
const char * const	string;
{
	return icatalloc((char *) NULL, string);
}

void
ifree(p)
char * const	p;
{
	if (!NULLMAL(p))
		(void) free(p);
}

void
icfree(p)
char * const	p;
{
	if (!NULLMAL(p))
		(void) free(p);
}
End of ialloc.c
echo file 'emkdir.c' >&2
cat >'emkdir.c' <<'End of emkdir.c'
#ifndef lint
#ifndef NOID
static char	elsieid[] = "@(#)emkdir.c	8.20";
#endif /* !defined NOID */
#endif /* !defined lint */

#ifndef emkdir

/*LINTLIBRARY*/

#include "private.h"

extern char *	imalloc P((int n));
extern void	ifree P((char * p));

static char *
quoted(name)
register const char *	name;
{
	register char *	result;
	register char *	cp;
	register int	c;

	if (name == NULL)
		name = "";
	result = imalloc(4 * strlen(name) + 3);
	if (result == NULL)
		return NULL;
	cp = result;
#ifdef unix
	*cp++ = '\'';
	while ((c = *name++) != '\0')
		if (c == '\'') {
			*cp++ = c;
			*cp++ = '\\';
			*cp++ = c;
			*cp++ = c;
		} else	*cp++ = c;
	*cp++ = '\'';
#else /* !defined unix */
	while ((c = *name++) != '\0')
		if (c == '/')
			*cp++ = '\\';
		else	*cp++ = c;
#endif /* !defined unix */
	*cp = '\0';
	return result;
}

int
emkdir(name, mode)
const char *	name;
const int	mode;
{
	register int		result;
	register const char *	format;
	register char *		command;
	register char *		qname;

	if ((qname = quoted(name)) == NULL)
		return -1;
#ifdef unix
	format = "mkdir 2>&- %s && chmod 2>&- %o %s";
#else /* !defined unix */
	format = "mkdir %s";
#endif /* !defined unix */
	command = imalloc(strlen(format) + 2 * strlen(qname) + 20 + 1);
	if (command == NULL) {
		ifree(qname);
		return -1;
	}
	(void) sprintf(command, format, qname, mode, qname);
	ifree(qname);
	result = system(command);
	ifree(command);
	return (result == 0) ? 0 : -1;
}

/*
** UNIX is a registered trademark of AT&T.
*/

#endif /* !defined emkdir */
End of emkdir.c
echo file 'getopt.c' >&2
cat >'getopt.c' <<'End of getopt.c'
#ifndef lint
#ifndef NOID
static char	elsieid[] = "@(#)getopt.c	7.1";
/* Modified from the UCB version whose SCCS ID appears below. */
#endif /* !defined NOID */
#endif /* !defined lint */

/*LINTLIBRARY*/

/*
 * Copyright (c) 1987 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that this notice is preserved and that due credit is given
 * to the University of California at Berkeley. The name of the University
 * may not be used to endorse or promote products derived from this
 * software without specific written prior permission. This software
 * is provided ``as is'' without express or implied warranty.
 */

#ifdef LIBC_SCCS
#ifndef lint
static char sccsid[] = "@(#)getopt.c	4.5 (Berkeley) 11/24/87";
#endif /* !defined lint */
#endif /* defined LIBC_SCCS */

#include <stdio.h>

/*
 * get option letter from argument vector
 */
int	opterr = 1,		/* if error message should be printed */
	optind = 1,		/* index into parent argv vector */
	optopt;			/* character checked for validity */
char	*optarg;		/* argument associated with option */

#define BADCH	(int)'?'
#define EMSG	""
#define tell(s)	{ \
	if (opterr) { \
		(void) fputs(*nargv, stderr); \
		(void) fputs(s, stderr); \
		(void) fputc(optopt, stderr); \
		(void) fputc((int)'\n', stderr); \
	} \
	return(BADCH); \
}

int
getopt(nargc, nargv, ostr)
	int	nargc;
	char	**nargv, *ostr;
{
	static char	*place = EMSG;		/* option letter processing */
	register char	*oli;			/* option letter list index */
	char	*strchr();

	if (!*place) {				/* update scanning pointer */
		if (optind >= nargc || *(place = nargv[optind]) != '-' ||
		    !*++place)
			return(EOF);
		if (*place == '-') {		/* found "--" */
			++optind;
			return(EOF);
		}
	}					/* option letter okay? */
	if ((optopt = (int)*place++) == (int)':' ||
	    !(oli = strchr(ostr, optopt))) {
		if (!*place)
			++optind;
		tell(": illegal option -- ");
	}
	if (*++oli != ':') {			/* don't need argument */
		optarg = NULL;
		if (!*place)
			++optind;
	}
	else {					/* need an argument */
		if (*place)			/* no white space */
			optarg = place;
		else if (nargc <= ++optind) {	/* no arg */
			place = EMSG;
			tell(": option requires an argument -- ");
		}
	 	else				/* white space */
			optarg = nargv[optind];
		place = EMSG;
		++optind;
	}
	return(optopt);				/* dump back option letter */
}
End of getopt.c
exit