tzcode2004i and tzdata2004g

Author: zenzen
Date: 2004-12-17 12:39:50 GMT
tzcode2004i and tzdata2004g

15 files changed, 762 insertions, 200 deletions

diff --git a/elsie.nci.nih.gov/src/Makefile b/elsie.nci.nih.gov/src/Makefile
index 86f9769..14fc5f7 100644
--- a/elsie.nci.nih.gov/src/Makefile
+++ b/elsie.nci.nih.gov/src/Makefile
@@ -1,4 +1,4 @@
-# @(#)Makefile	7.98
+# @(#)Makefile	7.102
 
 # Change the line below for your time zone (after finding the zone you want in
 # the time zone files, or adding it to a time zone file).
@@ -91,7 +91,6 @@ LDLIBS=
 #  -DHAVE_GETTEXT=1 if `gettext' works (GNU, Linux, Solaris); also see LDLIBS
 #  -DHAVE_INCOMPATIBLE_CTIME_R=1 if your system's time.h declares
 #	ctime_r and asctime_r incompatibly with the POSIX standard (Solaris 8).
-#  -DHAVE_LONG_DOUBLE=1 if your compiler supports the `long double' type
 #  -DHAVE_SETTIMEOFDAY=0 if settimeofday does not exist (SVR0?)
 #  -DHAVE_SETTIMEOFDAY=1 if settimeofday has just 1 arg (SVR4)
 #  -DHAVE_SETTIMEOFDAY=2 if settimeofday uses 2nd arg (4.3BSD)
@@ -395,6 +394,15 @@ public:		$(ENCHILADA) zic
 		tar cf - $(DOCS) $(SOURCES) $(MISC) *.[1-8].txt | gzip -9 > tzcode.tar.gz
 		tar cf - $(DATA) | gzip -9 > tzdata.tar.gz
 
+typecheck:	
+		make clean
+		for i in "long long" double unsigned; \
+		do \
+			make CFLAGS="-D_TIME_T \"-Dtime_t=$$i\"" ; \
+			./zdump -v US/Eastern ; \
+			make clean ; \
+		done
+
 zonenames:	$(TDATA)
 		@$(AWK) '/^Zone/ { print $$2 } /^Link/ { print $$3 }' $(TDATA)
 
diff --git a/elsie.nci.nih.gov/src/date.c b/elsie.nci.nih.gov/src/date.c
index e34eaa5..0113887 100644
--- a/elsie.nci.nih.gov/src/date.c
+++ b/elsie.nci.nih.gov/src/date.c
@@ -1,6 +1,6 @@
 #ifndef lint
 #ifndef NOID
-static char	elsieid[] = "@(#)date.c	7.38";
+static char	elsieid[] = "@(#)date.c	7.40";
 /*
 ** Modified from the UCB version with the SCCS ID appearing below.
 */
@@ -116,14 +116,15 @@ char *		argv[];
 	INITIALIZE(dsttime);
 	INITIALIZE(adjust);
 	INITIALIZE(t);
-#if HAVE_GETTEXT - 0
-	(void) setlocale(LC_MESSAGES, "");
+#ifdef LC_ALL
+	(void) setlocale(LC_ALL, "");
+#endif /* defined(LC_ALL) */
+#if HAVE_GETTEXT
 #ifdef TZ_DOMAINDIR
 	(void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR);
 #endif /* defined(TEXTDOMAINDIR) */
 	(void) textdomain(TZ_DOMAIN);
-#endif /* HAVE_GETTEXT - 0 */
-	(void) setlocale(LC_TIME, "");
+#endif /* HAVE_GETTEXT */
 	(void) time(&now);
 	format = value = NULL;
 	while ((ch = getopt(argc, argv, "ucnd:t:a:")) != EOF && ch != -1) {
@@ -630,8 +631,15 @@ const time_t			t;
 	time_t		outt;
 
 	tm = *localtime(&t);
-	cent = (tm.tm_year + TM_YEAR_BASE) / 100;
-	year_in_cent = (tm.tm_year + TM_YEAR_BASE) - cent * 100;
+#define DIVISOR	100
+	year_in_cent = tm.tm_year % DIVISOR + TM_YEAR_BASE % DIVISOR;
+	cent = tm.tm_year / DIVISOR + TM_YEAR_BASE / DIVISOR +
+		year_in_cent / DIVISOR;
+	year_in_cent %= DIVISOR;
+	if (year_in_cent < 0) {
+		year_in_cent += DIVISOR;
+		--cent;
+	}
 	month = tm.tm_mon + 1;
 	day = tm.tm_mday;
 	hour = tm.tm_hour;
diff --git a/elsie.nci.nih.gov/src/difftime.c b/elsie.nci.nih.gov/src/difftime.c
index 1d1519e..0be1b1c 100644
--- a/elsie.nci.nih.gov/src/difftime.c
+++ b/elsie.nci.nih.gov/src/difftime.c
@@ -1,83 +1,65 @@
 /*
 ** This file is in the public domain, so clarified as of
-** June 5, 1996 by Arthur David Olson (arthur_david_olson@nih.gov).
+** 1996-06-05 by Arthur David Olson (arthur_david_olson@nih.gov).
 */
 
 #ifndef lint
 #ifndef NOID
-static char	elsieid[] = "@(#)difftime.c	7.9";
+static char	elsieid[] = "@(#)difftime.c	7.17";
 #endif /* !defined NOID */
 #endif /* !defined lint */
 
 /*LINTLIBRARY*/
 
-#include "private.h"
-
-/*
-** Algorithm courtesy Paul Eggert (eggert@twinsun.com).
-*/
-
-#ifdef HAVE_LONG_DOUBLE
-#define long_double	long double
-#endif /* defined HAVE_LONG_DOUBLE */
-#ifndef HAVE_LONG_DOUBLE
-#define long_double	double
-#endif /* !defined HAVE_LONG_DOUBLE */
+#include "private.h"	/* for time_t, TYPE_INTEGRAL, and TYPE_SIGNED */
 
 double
 difftime(time1, time0)
 const time_t	time1;
 const time_t	time0;
 {
-	time_t	delta;
-	time_t	hibit;
-
-	{
-		time_t		tt;
-		double		d;
-		long_double	ld;
-
-		if (sizeof tt < sizeof d)
-			return (double) time1 - (double) time0;
-		if (sizeof tt < sizeof ld)
-			return (long_double) time1 - (long_double) time0;
+	/*
+	** If (sizeof (double) > sizeof (time_t)) simply convert and subtract
+	** (assuming that the larger type has more precision).
+	** This is the common real-world case circa 2004.
+	*/
+	if (sizeof (double) > sizeof (time_t))
+		return (double) time1 - (double) time0;
+	if (!TYPE_INTEGRAL(time_t)) {
+		/*
+		** time_t is floating.
+		*/
+		return time1 - time0;
+	}
+	if (!TYPE_SIGNED(time_t)) {
+		/*
+		** time_t is integral and unsigned.
+		** The difference of two unsigned values can't overflow
+		** if the minuend is greater than or equal to the subtrahend.
+		*/
+		if (time1 >= time0)
+			return time1 - time0;
+		else	return -((double) (time0 - time1));
 	}
-	if (time1 < time0)
-		return -difftime(time0, time1);
 	/*
-	** As much as possible, avoid loss of precision
-	** by computing the difference before converting to double.
+	** time_t is integral and signed.
+	** Handle cases where both time1 and time0 have the same sign
+	** (meaning that their difference cannot overflow).
 	*/
-	delta = time1 - time0;
-	if (delta >= 0)
-		return delta;
+	if ((time1 < 0) == (time0 < 0))
+		return time1 - time0;
 	/*
-	** Repair delta overflow.
+	** time1 and time0 have opposite signs.
+	** Punt if unsigned long is too narrow.
 	*/
-	hibit = (~ (time_t) 0) << (TYPE_BIT(time_t) - 1);
+	if (sizeof (unsigned long) < sizeof (time_t))
+		return (double) time1 - (double) time0;
 	/*
-	** The following expression rounds twice, which means
-	** the result may not be the closest to the true answer.
-	** For example, suppose time_t is 64-bit signed int,
-	** long_double is IEEE 754 double with default rounding,
-	** time1 = 9223372036854775807 and time0 = -1536.
-	** Then the true difference is 9223372036854777343,
-	** which rounds to 9223372036854777856
-	** with a total error of 513.
-	** But delta overflows to -9223372036854774273,
-	** which rounds to -9223372036854774784, and correcting
-	** this by subtracting 2 * (long_double) hibit
-	** (i.e. by adding 2**64 = 18446744073709551616)
-	** yields 9223372036854776832, which
-	** rounds to 9223372036854775808
-	** with a total error of 1535 instead.
-	** This problem occurs only with very large differences.
-	** It's too painful to fix this portably.
-	** We are not alone in this problem;
-	** some C compilers round twice when converting
-	** large unsigned types to small floating types,
-	** so if time_t is unsigned the "return delta" above
-	** has the same double-rounding problem with those compilers.
+	** Stay calm...decent optimizers will eliminate the complexity below.
 	*/
-	return delta - 2 * (long_double) hibit;
+	if (time1 >= 0 /* && time0 < 0 */) 
+		return (unsigned long) time1 +
+			(unsigned long) (-(time0 + 1)) + 1;
+	return -(double) ((unsigned long) time0 +
+		(unsigned long) (-(time1 + 1)) + 1);
 }
diff --git a/elsie.nci.nih.gov/src/europe b/elsie.nci.nih.gov/src/europe
index eeb114f..04546c7 100644
--- a/elsie.nci.nih.gov/src/europe
+++ b/elsie.nci.nih.gov/src/europe
@@ -1,4 +1,4 @@
-# @(#)europe	7.88
+# @(#)europe	7.90
 
 # This data is by no means authoritative; if you think you know better,
 # go ahead and edit the file (and please send any changes to
@@ -708,7 +708,7 @@ Zone	Europe/Sofia	1:33:16 -	LMT	1880
 # see Serbia and Montenegro
 
 # Cyprus
-# See the `asia' file.
+# Please see the `asia' file for Asia/Nicosia.
 
 # Czech Republic
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
@@ -1055,6 +1055,11 @@ Zone	Europe/Berlin	0:53:28 -	LMT	1893 Apr
 			1:00	Germany	CE%sT	1980
 			1:00	EU	CE%sT
 
+# Georgia
+# Please see the "asia" file for Asia/Tbilisi.
+# Herodotus (Histories, IV.45) says Georgia north of the Phasis (now Rioni)
+# is in Europe.  Our reference location Tbilisi is in the Asian part.
+
 # Gibraltar
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone Europe/Gibraltar	-0:21:24 -	LMT	1880 Aug  2
@@ -1611,7 +1616,7 @@ Zone	Europe/Oslo	0:43:00 -	LMT	1895 Jan  1
 # From Paul Eggert (2001-05-01):
 #
 # Actually, Jan Mayen was never occupied by Germany during World War II,
-# so it must have diverged from Oslo time during the war, as Olso was
+# so it must have diverged from Oslo time during the war, as Oslo was
 # keeping Berlin time.
 #
 # <http://home.no.net/janmayen/history.htm> says that the meteorologists
diff --git a/elsie.nci.nih.gov/src/localtime.c b/elsie.nci.nih.gov/src/localtime.c
index 8cdcd80..6cc1b22 100644
--- a/elsie.nci.nih.gov/src/localtime.c
+++ b/elsie.nci.nih.gov/src/localtime.c
@@ -1,11 +1,17 @@
 /*
+** XXX--do the right thing if time_t is double and
+** the value fed to gmtime or localtime is very very negative or
+** very very positive (which causes problems with the days-and-rem logic).
+*/
+
+/*
 ** This file is in the public domain, so clarified as of
 ** 1996-06-05 by Arthur David Olson (arthur_david_olson@nih.gov).
 */
 
 #ifndef lint
 #ifndef NOID
-static char	elsieid[] = "@(#)localtime.c	7.80";
+static char	elsieid[] = "@(#)localtime.c	7.83";
 #endif /* !defined NOID */
 #endif /* !defined lint */
 
@@ -409,6 +415,33 @@ register struct state * const	sp;
 						return -1;
 			}
 		}
+		/*
+		** Out-of-sort ats should mean we're running on a
+		** signed time_t system but using a data file with
+		** unsigned values (or vice versa).
+		*/
+		for (i = 0; i < sp->timecnt - 2; ++i)
+			if (sp->ats[i] > sp->ats[i + 1]) {
+				++i;
+				if (TYPE_SIGNED(time_t)) {
+					/*
+					** Ignore the end (easy).
+					*/
+					sp->timecnt = i;
+				} else {
+					/*
+					** Ignore the beginning (harder).
+					*/
+					register int	j;
+
+					for (j = 0; j + i < sp->timecnt; ++j) {
+						sp->ats[j] = sp->ats[j + i];
+						sp->types[j] = sp->types[j + i];
+					}
+					sp->timecnt = j;
+				}
+				break;
+			}
 	}
 	return 0;
 }
@@ -1188,7 +1221,7 @@ register struct tm * const		tmp;
 		}
 	}
 	days = *timep / SECSPERDAY;
-	rem = *timep % SECSPERDAY;
+	rem = *timep - ((time_t) days) * SECSPERDAY;
 #ifdef mc68k
 	if (*timep == 0x80000000) {
 		/*
@@ -1219,7 +1252,8 @@ register struct tm * const		tmp;
 	if (tmp->tm_wday < 0)
 		tmp->tm_wday += DAYSPERWEEK;
 	y = EPOCH_YEAR;
-#define LEAPS_THRU_END_OF(y)	((y) / 4 - (y) / 100 + (y) / 400)
+#define IPQ(i, p)	((i) / (p) - (((i) % (p)) < 0))
+#define LEAPS_THRU_END_OF(y)	(IPQ((y), 4) - IPQ((y), 100) + IPQ((y), 400))
 	while (days < 0 || days >= (long) year_lengths[yleap = isleap(y)]) {
 		register long	newy;
 
@@ -1450,7 +1484,7 @@ const int		do_norm_secs;
 	** assuming two's complement arithmetic.
 	** If time_t is unsigned, then (1 << bits) is just above the median.
 	*/
-	t = TYPE_SIGNED(time_t) ? 0 : (((time_t) 1) << bits);
+	t = TYPE_SIGNED(time_t) ? 0 : (((unsigned long) 1) << bits);
 	for ( ; ; ) {
 		(*funcp)(&t, offset, &mytm);
 		dir = tmcomp(&mytm, &yourtm);
@@ -1460,8 +1494,8 @@ const int		do_norm_secs;
 			if (bits < 0)
 				--t; /* may be needed if new t is minimal */
 			else if (dir > 0)
-				t -= ((time_t) 1) << bits;
-			else	t += ((time_t) 1) << bits;
+				t -= ((long) 1) << bits;
+			else	t += ((long) 1) << bits;
 			continue;
 		}
 		if (yourtm.tm_isdst < 0 || mytm.tm_isdst == yourtm.tm_isdst)
diff --git a/elsie.nci.nih.gov/src/newstrftime.3 b/elsie.nci.nih.gov/src/newstrftime.3
index 8d5f982..61bb57f 100644
--- a/elsie.nci.nih.gov/src/newstrftime.3
+++ b/elsie.nci.nih.gov/src/newstrftime.3
@@ -35,7 +35,7 @@
 .\" SUCH DAMAGE.
 .\"
 .\"     from: @(#)strftime.3	5.12 (Berkeley) 6/29/91
-.\"	$Id: newstrftime.3,v 1.6 2004/10/25 04:27:18 zenzen Exp $
+.\"	$Id: newstrftime.3,v 1.7 2004/12/17 12:39:51 zenzen Exp $
 .\"
 .TH NEWSTRFTIME 3
 .SH NAME
diff --git a/elsie.nci.nih.gov/src/northamerica b/elsie.nci.nih.gov/src/northamerica
index 6e755b0..19b635f 100644
--- a/elsie.nci.nih.gov/src/northamerica
+++ b/elsie.nci.nih.gov/src/northamerica
@@ -1,4 +1,4 @@
-# @(#)northamerica	7.69
+# @(#)northamerica	7.70
 # also includes Central America and the Caribbean
 
 # This data is by no means authoritative; if you think you know better,
@@ -1731,6 +1731,15 @@ Zone America/Costa_Rica	-5:36:20 -	LMT	1890		# San Jose
 # to DST--and one more hour on 1999-04-04--when the announcers will have
 # returned to Baltimore, which switches on that date.)
 
+# From Evert van der Veer via Steffen Thorsen (2004-10-28):
+# Cuba is not going back to standard time this year.
+# From Paul Eggert (2004-10-28):
+# http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html
+# says that it's due to a problem at the Antonio Guiteras
+# thermoelectric plant, and says "This October there will be no return
+# to normal hours (after daylight saving time)".
+# For now, let's assume that it's a one-year temporary measure.
+
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
 Rule	Cuba	1928	only	-	Jun	10	0:00	1:00	D
 Rule	Cuba	1928	only	-	Oct	10	0:00	0	S
@@ -1759,8 +1768,9 @@ Rule	Cuba	1991	1995	-	Oct	Sun>=8	0:00s	0	S
 Rule	Cuba	1996	only	-	Oct	 6	0:00s	0	S
 Rule	Cuba	1997	only	-	Oct	12	0:00s	0	S
 Rule	Cuba	1998	1999	-	Mar	lastSun	0:00s	1:00	D
-Rule	Cuba	1998	max	-	Oct	lastSun	0:00s	0	S
+Rule	Cuba	1998	2003	-	Oct	lastSun	0:00s	0	S
 Rule	Cuba	2000	max	-	Apr	Sun>=1	0:00s	1:00	D
+Rule	Cuba	2005	max	-	Oct	lastSun	0:00s	0	S
 
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone	America/Havana	-5:29:28 -	LMT	1890
diff --git a/elsie.nci.nih.gov/src/private.h b/elsie.nci.nih.gov/src/private.h
index 5766305..5de2f7d 100644
--- a/elsie.nci.nih.gov/src/private.h
+++ b/elsie.nci.nih.gov/src/private.h
@@ -21,7 +21,7 @@
 
 #ifndef lint
 #ifndef NOID
-static char	privatehid[] = "@(#)private.h	7.54";
+static char	privatehid[] = "@(#)private.h	7.55";
 #endif /* !defined NOID */
 #endif /* !defined lint */
 
@@ -208,6 +208,7 @@ extern char *	asctime_r();
 /*
 ** Private function declarations.
 */
+
 char *	icalloc P((int nelem, int elsize));
 char *	icatalloc P((char * old, const char * new));
 char *	icpyalloc P((const char * string));
@@ -217,7 +218,6 @@ void	icfree P((char * pointer));
 void	ifree P((char * pointer));
 char *	scheck P((const char *string, const char *format));
 
-
 /*
 ** Finally, some convenience items.
 */
@@ -238,6 +238,15 @@ char *	scheck P((const char *string, const char *format));
 #define TYPE_SIGNED(type) (((type) -1) < 0)
 #endif /* !defined TYPE_SIGNED */
 
+/*
+** Since the definition of TYPE_INTEGRAL contains floating point numbers,
+** it cannot be used in preprocessor directives.
+*/
+
+#ifndef TYPE_INTEGRAL
+#define TYPE_INTEGRAL(type) (((type) 0.5) != 0.5)
+#endif /* !defined TYPE_INTEGRAL */
+
 #ifndef INT_STRLEN_MAXIMUM
 /*
 ** 302 / 1000 is log10(2.0) rounded up.
diff --git a/elsie.nci.nih.gov/src/southamerica b/elsie.nci.nih.gov/src/southamerica
index 9124910..eacd182 100644
--- a/elsie.nci.nih.gov/src/southamerica
+++ b/elsie.nci.nih.gov/src/southamerica
@@ -1,4 +1,4 @@
-# @(#)southamerica	7.54
+# @(#)southamerica	7.55
 
 # This data is by no means authoritative; if you think you know better,
 # go ahead and edit the file (and please send any changes to
@@ -671,7 +671,7 @@ Zone America/Campo_Grande -3:38:28 -	LMT	1914
 # Mato Grosso (MT)
 Zone America/Cuiaba	-3:44:20 -	LMT	1914
 			-4:00	Brazil	AM%sT	2003 Sep 24
-			-4:00	-	AMT	2004 Oct  4
+			-4:00	-	AMT	2004 Oct  1
 			-4:00	Brazil	AM%sT
 #
 # west Para (PA), Rondonia (RO)
diff --git a/elsie.nci.nih.gov/src/tzselect b/elsie.nci.nih.gov/src/tzselect
new file mode 100755
index 0000000..9111742
--- /dev/null
+++ b/elsie.nci.nih.gov/src/tzselect
@@ -0,0 +1,308 @@
+#! /bin/ksh
+
+# '@(#)tzselect.ksh	1.7'
+
+# Ask the user about the time zone, and output the resulting TZ value to stdout.
+# Interact with the user via stderr and stdin.
+
+# Contributed by Paul Eggert <eggert@twinsun.com>.
+
+# Porting notes:
+#
+# This script requires several features of the Korn shell.
+# If your host lacks the Korn shell,
+# you can use either of the following free programs instead:
+#
+#	<a href=ftp://ftp.gnu.org/pub/gnu/>
+#	Bourne-Again shell (bash)
+#	</a>
+#
+#	<a href=ftp://ftp.cs.mun.ca/pub/pdksh/pdksh.tar.gz>
+#	Public domain ksh
+#	</a>
+#
+# This script also uses several features of modern awk programs.
+# If your host lacks awk, or has an old awk that does not conform to Posix.2,
+# you can use either of the following free programs instead:
+#
+#	<a href=ftp://ftp.gnu.org/pub/gnu/>
+#	GNU awk (gawk)
+#	</a>
+#
+#	<a href=ftp://ftp.whidbey.net/pub/brennan/>
+#	mawk
+#	</a>
+
+
+# Specify default values for environment variables if they are unset.
+: ${AWK=nawk}
+: ${TZDIR=/home/stub/src/pytz/build/etc/zoneinfo}
+
+# Check for awk Posix compliance.
+($AWK -v x=y 'BEGIN { exit 123 }') </dev/null >/dev/null 2>&1
+[ $? = 123 ] || {
+	echo >&2 "$0: Sorry, your \`$AWK' program is not Posix compatible."
+	exit 1
+}
+
+# Make sure the tables are readable.
+TZ_COUNTRY_TABLE=$TZDIR/iso3166.tab
+TZ_ZONE_TABLE=$TZDIR/zone.tab
+for f in $TZ_COUNTRY_TABLE $TZ_ZONE_TABLE
+do
+	<$f || {
+		echo >&2 "$0: time zone files are not set up correctly"
+		exit 1
+	}
+done
+
+newline='
+'
+IFS=$newline
+
+
+# Work around a bug in bash 1.14.7 and earlier, where $PS3 is sent to stdout.
+case $(echo 1 | (select x in x; do break; done) 2>/dev/null) in
+?*) PS3=
+esac
+
+
+# Begin the main loop.  We come back here if the user wants to retry.
+while
+
+	echo >&2 'Please identify a location' \
+		'so that time zone rules can be set correctly.'
+
+	continent=
+	country=
+	region=
+
+
+	# Ask the user for continent or ocean.
+
+	echo >&2 'Please select a continent or ocean.'
+
+	select continent in \
+	    Africa \
+	    Americas \
+	    Antarctica \
+	    'Arctic Ocean' \
+	    Asia \
+	    'Atlantic Ocean' \
+	    Australia \
+	    Europe \
+	    'Indian Ocean' \
+	    'Pacific Ocean' \
+	    'none - I want to specify the time zone using the Posix TZ format.'
+	do
+	    case $continent in
+	    '')
+		echo >&2 'Please enter a number in range.';;
+	    ?*)
+		case $continent in
+		Americas) continent=America;;
+		*' '*) continent=$(expr "$continent" : '\([^ ]*\)')
+		esac
+		break
+	    esac
+	done
+	case $continent in
+	'')
+		exit 1;;
+	none)
+		# Ask the user for a Posix TZ string.  Check that it conforms.
+		while
+			echo >&2 'Please enter the desired value' \
+				'of the TZ environment variable.'
+			echo >&2 'For example, GST-10 is a zone named GST' \
+				'that is 10 hours ahead (east) of UTC.'
+			read TZ
+			$AWK -v TZ="$TZ" 'BEGIN {
+				tzname = "[^-+,0-9][^-+,0-9][^-+,0-9]+"
+				time = "[0-2]?[0-9](:[0-5][0-9](:[0-5][0-9])?)?"
+				offset = "[-+]?" time
+				date = "(J?[0-9]+|M[0-9]+\.[0-9]+\.[0-9]+)"
+				datetime = "," date "(/" time ")?"
+				tzpattern = "^(:.*|" tzname offset "(" tzname \
+				  "(" offset ")?(" datetime datetime ")?)?)$"
+				if (TZ ~ tzpattern) exit 1
+				exit 0
+			}'
+		do
+			echo >&2 "\`$TZ' is not a conforming" \
+				'Posix time zone string.'
+		done
+		TZ_for_date=$TZ;;
+	*)
+		# Get list of names of countries in the continent or ocean.
+		countries=$($AWK -F'\t' \
+			-v continent="$continent" \
+			-v TZ_COUNTRY_TABLE="$TZ_COUNTRY_TABLE" \
+		'
+			/^#/ { next }
+			$3 ~ ("^" continent "/") {
+				if (!cc_seen[$1]++) cc_list[++ccs] = $1
+			}
+			END {
+				while (getline <TZ_COUNTRY_TABLE) {
+					if ($0 !~ /^#/) cc_name[$1] = $2
+				}
+				for (i = 1; i <= ccs; i++) {
+					country = cc_list[i]
+					if (cc_name[country]) {
+					  country = cc_name[country]
+					}
+					print country
+				}
+			}
+		' <$TZ_ZONE_TABLE | sort -f)
+
+
+		# If there's more than one country, ask the user which one.
+		case $countries in
+		*"$newline"*)
+			echo >&2 'Please select a country.'
+			select country in $countries
+			do
+			    case $country in
+			    '') echo >&2 'Please enter a number in range.';;
+			    ?*) break
+			    esac
+			done
+
+			case $country in
+			'') exit 1
+			esac;;
+		*)
+			country=$countries
+		esac
+
+
+		# Get list of names of time zone rule regions in the country.
+		regions=$($AWK -F'\t' \
+			-v country="$country" \
+			-v TZ_COUNTRY_TABLE="$TZ_COUNTRY_TABLE" \
+		'
+			BEGIN {
+				cc = country
+				while (getline <TZ_COUNTRY_TABLE) {
+					if ($0 !~ /^#/  &&  country == $2) {
+						cc = $1
+						break
+					}
+				}
+			}
+			$1 == cc { print $4 }
+		' <$TZ_ZONE_TABLE)
+
+
+		# If there's more than one region, ask the user which one.
+		case $regions in
+		*"$newline"*)
+			echo >&2 'Please select one of the following' \
+				'time zone regions.'
+			select region in $regions
+			do
+				case $region in
+				'') echo >&2 'Please enter a number in range.';;
+				?*) break
+				esac
+			done
+			case $region in
+			'') exit 1
+			esac;;
+		*)
+			region=$regions
+		esac
+
+		# Determine TZ from country and region.
+		TZ=$($AWK -F'\t' \
+			-v country="$country" \
+			-v region="$region" \
+			-v TZ_COUNTRY_TABLE="$TZ_COUNTRY_TABLE" \
+		'
+			BEGIN {
+				cc = country
+				while (getline <TZ_COUNTRY_TABLE) {
+					if ($0 !~ /^#/  &&  country == $2) {
+						cc = $1
+						break
+					}
+				}
+			}
+			$1 == cc && $4 == region { print $3 }
+		' <$TZ_ZONE_TABLE)
+
+		# Make sure the corresponding zoneinfo file exists.
+		TZ_for_date=$TZDIR/$TZ
+		<$TZ_for_date || {
+			echo >&2 "$0: time zone files are not set up correctly"
+			exit 1
+		}
+	esac
+
+
+	# Use the proposed TZ to output the current date relative to UTC.
+	# Loop until they agree in seconds.
+	# Give up after 8 unsuccessful tries.
+
+	extra_info=
+	for i in 1 2 3 4 5 6 7 8
+	do
+		TZdate=$(LANG=C TZ="$TZ_for_date" date)
+		UTdate=$(LANG=C TZ=UTC0 date)
+		TZsec=$(expr "$TZdate" : '.*:\([0-5][0-9]\)')
+		UTsec=$(expr "$UTdate" : '.*:\([0-5][0-9]\)')
+		case $TZsec in
+		$UTsec)
+			extra_info="
+Local time is now:	$TZdate.
+Universal Time is now:	$UTdate."
+			break
+		esac
+	done
+
+
+	# Output TZ info and ask the user to confirm.
+
+	echo >&2 ""
+	echo >&2 "The following information has been given:"
+	echo >&2 ""
+	case $country+$region in
+	?*+?*)	echo >&2 "	$country$newline	$region";;
+	?*+)	echo >&2 "	$country";;
+	+)	echo >&2 "	TZ='$TZ'"
+	esac
+	echo >&2 ""
+	echo >&2 "Therefore TZ='$TZ' will be used.$extra_info"
+	echo >&2 "Is the above information OK?"
+
+	ok=
+	select ok in Yes No
+	do
+	    case $ok in
+	    '') echo >&2 'Please enter 1 for Yes, or 2 for No.';;
+	    ?*) break
+	    esac
+	done
+	case $ok in
+	'') exit 1;;
+	Yes) break
+	esac
+do :
+done
+
+case $SHELL in
+*csh) file=.login line="setenv TZ '$TZ'";;
+*) file=.profile line="TZ='$TZ'; export TZ"
+esac
+
+echo >&2 "
+You can make this change permanent for yourself by appending the line
+	$line
+to the file '$file' in your home directory; then log out and log in again.
+
+Here is that TZ value again, this time on standard output so that you
+can use the $0 command in shell scripts:"
+
+echo "$TZ"
diff --git a/elsie.nci.nih.gov/src/workman.sh b/elsie.nci.nih.gov/src/workman.sh
new file mode 100644
index 0000000..57a2893
--- /dev/null
+++ b/elsie.nci.nih.gov/src/workman.sh
@@ -0,0 +1,29 @@
+#! /bin/sh
+
+# @(#)workman.sh	1.7
+
+# Tell groff not to emit SGR escape sequences (ANSI color escapes).
+GROFF_NO_SGR=1
+export GROFF_NO_SGR
+
+echo ".am TH
+.hy 0
+.na
+..
+.rm }H
+.rm }F" | nroff -man - ${1+"$@"} | perl -ne '
+	chomp;
+	s/.\010//g;
+	s/\s*$//;
+	if (/^$/) {
+		$sawblank = 1;
+		next;
+	} else {
+		if ($sawblank && $didprint) {
+			print "\n";
+			$sawblank = 0;
+		}
+		print "$_\n";
+		$didprint = 1;
+	}
+' 
diff --git a/elsie.nci.nih.gov/src/zdump.8 b/elsie.nci.nih.gov/src/zdump.8
index dff68c2..b22a129 100644
--- a/elsie.nci.nih.gov/src/zdump.8
+++ b/elsie.nci.nih.gov/src/zdump.8
@@ -10,7 +10,7 @@ zdump \- time zone dumper
 .B \-v
 ] [
 .B \-c
-cutoffyear ] [ zonename ... ]
+[loyear,]hiyear ] [ zonename ... ]
 .SH DESCRIPTION
 .I Zdump
 prints the current time in each
@@ -38,8 +38,20 @@ if the given time is Daylight Saving Time or
 .B isdst=0
 otherwise.
 .TP
-.BI "\-c " cutoffyear
-Cut off the verbose output near the start of the given year.
+.BI "\-c " [loyear,]hiyear
+Cut off verbose output near the start of the given year(s).
+By default,
+the program cuts off verbose output near the starts of the years -500 and 2500.
+.SH LIMITATIONS
+The
+.B \-v
+option may not be used on systems with floating-point time_t values
+that are neither float nor double.
+.PP
+Time discontinuities are found by sampling the results returned by localtime
+at twelve-hour intervals.
+This works in all real-world cases;
+one can construct artificial time zones for which this fails.
 .SH "SEE ALSO"
 newctime(3), tzfile(5), zic(8)
-.\" @(#)zdump.8	7.4
+.\" @(#)zdump.8	7.7
diff --git a/elsie.nci.nih.gov/src/zdump.8.txt b/elsie.nci.nih.gov/src/zdump.8.txt
index 3499d78..78c647f 100644
--- a/elsie.nci.nih.gov/src/zdump.8.txt
+++ b/elsie.nci.nih.gov/src/zdump.8.txt
@@ -3,8 +3,8 @@ NAME
      zdump - time zone dumper
 
 SYNOPSIS
-     zdump [ --version ] [ -v ] [ -c cutoffyear ] [ zonename ...
-     ]
+     zdump [ --version ] [ -v ] [ -c [loyear,]hiyear ] [ zonename
+     ... ]
 
 DESCRIPTION
      Zdump prints the current time in each zonename named on the
@@ -25,9 +25,19 @@ DESCRIPTION
           isdst=1 if the given time is Daylight Saving Time or
           isdst=0 otherwise.
 
-     -c cutoffyear
-          Cut off the verbose output near the start of the given
-          year.
+     -c [loyear,]hiyear
+          Cut off verbose output near the start of the given
+          year(s).  By default, the program cuts off verbose
+          output near the starts of the years -500 and 2500.
+
+LIMITATIONS
+     The -v option may not be used on systems with floating-point
+     time_t values that are neither float nor double.
+
+     Time discontinuities are found by sampling the results
+     returned by localtime at twelve-hour intervals.  This works
+     in all real-world cases; one can construct artificial time
+     zones for which this fails.
 
 SEE ALSO
      newctime(3), tzfile(5), zic(8)
diff --git a/elsie.nci.nih.gov/src/zdump.c b/elsie.nci.nih.gov/src/zdump.c
index 6e697f3..7142d04 100644
--- a/elsie.nci.nih.gov/src/zdump.c
+++ b/elsie.nci.nih.gov/src/zdump.c
@@ -1,4 +1,4 @@
-static char	elsieid[] = "@(#)zdump.c	7.47";
+static char	elsieid[] = "@(#)zdump.c	7.57";
 
 /*
 ** This code has been made independent of the rest of the time
@@ -11,6 +11,15 @@ static char	elsieid[] = "@(#)zdump.c	7.47";
 #include "sys/types.h"	/* for time_t */
 #include "time.h"	/* for struct tm */
 #include "stdlib.h"	/* for exit, malloc, atoi */
+#include "float.h"	/* for FLT_MAX and DBL_MAX */
+
+#ifndef ZDUMP_LO_YEAR
+#define ZDUMP_LO_YEAR	(-500)
+#endif /* !defined ZDUMP_LO_YEAR */
+
+#ifndef ZDUMP_HI_YEAR
+#define ZDUMP_HI_YEAR	2500
+#endif /* !defined ZDUMP_HI_YEAR */
 
 #ifndef MAX_STRING_LENGTH
 #define MAX_STRING_LENGTH	1024
@@ -71,6 +80,10 @@ static char	elsieid[] = "@(#)zdump.c	7.47";
 #define isleap_sum(a, b)	isleap((a) % 400 + (b) % 400)
 #endif /* !defined isleap_sum */
 
+#define SECSPERDAY	((long) SECSPERHOUR * HOURSPERDAY)
+#define SECSPERNYEAR	(SECSPERDAY * DAYSPERNYEAR)
+#define SECSPERLYEAR	(SECSPERNYEAR + SECSPERDAY)
+
 #if HAVE_GETTEXT
 #include "locale.h"	/* for setlocale */
 #include "libintl.h"
@@ -122,18 +135,23 @@ static char	elsieid[] = "@(#)zdump.c	7.47";
 
 extern char **	environ;
 extern int	getopt P((int argc, char * const argv[],
-			  const char * options));
+			const char * options));
 extern char *	optarg;
 extern int	optind;
 extern char *	tzname[2];
 
+static time_t	absolute_min_time;
+static time_t	absolute_max_time;
+static size_t	longest;
+static char *	progname;
+
 static char *	abbr P((struct tm * tmp));
 static long	delta P((struct tm * newp, struct tm * oldp));
+static void	dumptime P((const struct tm * tmp));
 static time_t	hunt P((char * name, time_t lot, time_t	hit));
-static size_t	longest;
-static char *	progname;
+static void	setabsolutes();
 static void	show P((char * zone, time_t t, int v));
-static void	dumptime P((const struct tm * tmp));
+static time_t	yeartot P((long y));
 
 int
 main(argc, argv)
@@ -143,18 +161,22 @@ char *	argv[];
 	register int		i;
 	register int		c;
 	register int		vflag;
-	register char *		cutoff;
-	register int		cutyear;
-	register long		cuttime;
-	char **			fakeenv;
+	register char *		cutarg;
+	register long		cutloyear = ZDUMP_LO_YEAR;
+	register long		cuthiyear = ZDUMP_HI_YEAR;
+	register time_t		cutlotime;
+	register time_t		cuthitime;
+	register char **	fakeenv;
 	time_t			now;
 	time_t			t;
 	time_t			newt;
-	time_t			hibit;
 	struct tm		tm;
 	struct tm		newtm;
+	register struct tm *	tmp;
+	register struct tm *	newtmp;
 
-	INITIALIZE(cuttime);
+	INITIALIZE(cutlotime);
+	INITIALIZE(cuthitime);
 #if HAVE_GETTEXT
 	(void) setlocale(LC_MESSAGES, "");
 #ifdef TZ_DOMAINDIR
@@ -169,39 +191,50 @@ char *	argv[];
 			(void) exit(EXIT_SUCCESS);
 		}
 	vflag = 0;
-	cutoff = NULL;
+	cutarg = NULL;
 	while ((c = getopt(argc, argv, "c:v")) == 'c' || c == 'v')
 		if (c == 'v')
 			vflag = 1;
-		else	cutoff = optarg;
+		else	cutarg = optarg;
 	if ((c != EOF && c != -1) ||
 		(optind == argc - 1 && strcmp(argv[optind], "=") == 0)) {
 			(void) fprintf(stderr,
-_("%s: usage is %s [ --version ] [ -v ] [ -c cutoff ] zonename ...\n"),
-				argv[0], argv[0]);
+_("%s: usage is %s [ --version ] [ -v ] [ -c [loyear,]hiyear ] zonename ...\n"),
+				progname, progname);
 			(void) exit(EXIT_FAILURE);
 	}
-	if (cutoff != NULL) {
-		int	y;
-
-		cutyear = atoi(cutoff);
-		cuttime = 0;
-		for (y = EPOCH_YEAR; y < cutyear; ++y)
-			cuttime += DAYSPERNYEAR + isleap(y);
-		cuttime *= SECSPERHOUR * HOURSPERDAY;
+	if (vflag) {
+		if (cutarg != NULL) {
+			long	lo;
+			long	hi;
+			char	c;
+
+			if (sscanf(cutarg, "%ld%c", &hi, &c) == 1) {
+				cuthiyear = hi;
+			} else if (sscanf(cutarg, "%ld,%ld%c",
+				&lo, &hi, &c) == 2) {
+					cutloyear = lo;
+					cuthiyear = hi;
+			} else {
+(void) fprintf(stderr, _("%s: wild -c argument %s\n"),
+					progname, cutarg);
+				(void) exit(EXIT_FAILURE);
+			}
+		}
+		setabsolutes();
+		cutlotime = yeartot(cutloyear);
+		cuthitime = yeartot(cuthiyear);
 	}
 	(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)
-		continue;
 	{
 		register int	from;
 		register int	to;
 
-		for (i = 0;  environ[i] != NULL;  ++i)
+		for (i = 0; environ[i] != NULL; ++i)
 			continue;
 		fakeenv = (char **) malloc((size_t) ((i + 2) *
 			sizeof *fakeenv));
@@ -226,58 +259,129 @@ _("%s: usage is %s [ --version ] [ -v ] [ -c cutoff ] zonename ...\n"),
 			show(argv[i], now, FALSE);
 			continue;
 		}
-		/*
-		** Get lowest value of t.
-		*/
-		t = hibit;
-		if (t > 0)		/* time_t is unsigned */
-			t = 0;
+		t = absolute_min_time;
 		show(argv[i], t, TRUE);
 		t += SECSPERHOUR * HOURSPERDAY;
 		show(argv[i], t, TRUE);
-		tm = *localtime(&t);
-		(void) strncpy(buf, abbr(&tm), (sizeof buf) - 1);
+		if (t < cutlotime)
+			t = cutlotime;
+		tmp = localtime(&t);
+		if (tmp != NULL) {
+			tm = *tmp;
+			(void) strncpy(buf, abbr(&tm), (sizeof buf) - 1);
+		}
 		for ( ; ; ) {
-			if (cutoff != NULL && t >= cuttime)
+			if (t >= cuthitime)
 				break;
 			newt = t + SECSPERHOUR * 12;
-			if (cutoff != NULL && newt >= cuttime)
+			if (newt >= cuthitime)
 				break;
 			if (newt <= t)
 				break;
-			newtm = *localtime(&newt);
-			if (delta(&newtm, &tm) != (newt - t) ||
+			newtmp = localtime(&newt);
+			if (newtmp != NULL)
+				newtm = *newtmp;
+			if ((tmp == NULL || newtmp == NULL) ?  (tmp != newtmp) :
+				(delta(&newtm, &tm) != (newt - t) ||
 				newtm.tm_isdst != tm.tm_isdst ||
-				strcmp(abbr(&newtm), buf) != 0) {
+				strcmp(abbr(&newtm), buf) != 0)) {
 					newt = hunt(argv[i], t, newt);
-					newtm = *localtime(&newt);
-					(void) strncpy(buf, abbr(&newtm),
-						(sizeof buf) - 1);
+					newtmp = localtime(&newt);
+					if (newtmp != NULL) {
+						newtm = *newtmp;
+						(void) strncpy(buf,
+							abbr(&newtm),
+							(sizeof buf) - 1);
+					}
 			}
 			t = newt;
 			tm = newtm;
+			tmp = newtmp;
 		}
-		/*
-		** Get highest value of t.
-		*/
-		t = ~((time_t) 0);
-		if (t < 0)		/* time_t is signed */
-			t &= ~hibit;
+		t = absolute_max_time;
 		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: ", argv[0]);
+		(void) fprintf(stderr, "%s: ", progname);
 		(void) perror(_("Error writing standard output"));
 		(void) exit(EXIT_FAILURE);
 	}
 	exit(EXIT_SUCCESS);
+	/* If exit fails to exit... */
+	return EXIT_FAILURE;
+}
+
+static void
+setabsolutes()
+{
+	if (0.5 == (time_t) 0.5) {
+		/*
+		** time_t is floating.
+		*/
+		if (sizeof (time_t) == sizeof (float)) {
+			absolute_min_time = (time_t) -FLT_MAX;
+			absolute_max_time = (time_t) FLT_MAX;
+		} else if (sizeof (time_t) == sizeof (double)) {
+			absolute_min_time = (time_t) -DBL_MAX;
+			absolute_max_time = (time_t) DBL_MAX;
+		} else {
+			(void) fprintf(stderr,
+_("%s: use of -v on system with floating time_t other than float or double\n"),
+				progname);
+			(void) exit(EXIT_FAILURE);
+		}
+	} else if (0 > (time_t) -1) {
+		/*
+		** time_t is signed.
+		*/
+		register time_t	hibit;
 
-	/* gcc -Wall pacifier */
-	for ( ; ; )
-		continue;
+		for (hibit = 1; (hibit * 2) != 0; hibit *= 2)
+			continue;
+		absolute_min_time = hibit;
+		absolute_max_time = -(hibit + 1);
+	} else {
+		/*
+		** time_t is unsigned.
+		*/
+		absolute_min_time = 0;
+		absolute_max_time = absolute_min_time - 1;
+	}
+}
+
+static time_t
+yeartot(y)
+const long	y;
+{
+	register long	myy;
+	register long	seconds;
+	register time_t	t;
+
+	myy = EPOCH_YEAR;
+	t = 0;
+	while (myy != y) {
+		if (myy < y) {
+			seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
+			++myy;
+			if (t > absolute_max_time - seconds) {
+				t = absolute_max_time;
+				break;
+			}
+			t += seconds;
+		} else {
+			--myy;
+			seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
+			if (t < absolute_min_time + seconds) {
+				t = absolute_min_time;
+				break;
+			}
+			t -= seconds;
+		}
+	}
+	return t;
 }
 
 static time_t
@@ -286,25 +390,39 @@ 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;
+	time_t			t;
+	long			diff;
+	struct tm		lotm;
+	register struct tm *	lotmp;
+	struct tm		tm;
+	register struct tm *	tmp;
+	char			loab[MAX_STRING_LENGTH];
+
+	lotmp = localtime(&lot);
+	if (lotmp != NULL) {
+		lotm = *lotmp;
+		(void) strncpy(loab, abbr(&lotm), (sizeof loab) - 1);
+	}
+	for ( ; ; ) {
+		diff = (long) (hit - lot);
+		if (diff < 2)
+			break;
+		t = lot;
+		t += diff / 2;
 		if (t <= lot)
 			++t;
 		else if (t >= hit)
 			--t;
-		tm = *localtime(&t);
-		if (delta(&tm, &lotm) == (t - lot) &&
+		tmp = localtime(&t);
+		if (tmp != NULL)
+			tm = *tmp;
+		if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) :
+			(delta(&tm, &lotm) == (t - lot) &&
 			tm.tm_isdst == lotm.tm_isdst &&
-			strcmp(abbr(&tm), loab) == 0) {
+			strcmp(abbr(&tm), loab) == 0)) {
 				lot = t;
 				lotm = tm;
+				lotmp = tmp;
 		} else	hit = t;
 	}
 	show(name, lot, TRUE);
@@ -321,8 +439,8 @@ delta(newp, oldp)
 struct tm *	newp;
 struct tm *	oldp;
 {
-	long	result;
-	int	tmy;
+	register long	result;
+	register int	tmy;
 
 	if (newp->tm_year < oldp->tm_year)
 		return -delta(oldp, newp);
@@ -345,22 +463,30 @@ char *	zone;
 time_t	t;
 int	v;
 {
-	struct tm *	tmp;
+	register struct tm *	tmp;
 
 	(void) printf("%-*s  ", (int) longest, zone);
 	if (v) {
-		dumptime(gmtime(&t));
-		(void) printf(" UTC = ");
+		tmp = gmtime(&t);
+		if (tmp == NULL) {
+			(void) printf("%g", (double) t);
+		} else {
+			dumptime(tmp);
+			(void) printf(" UTC");
+		}
+		(void) printf(" = ");
 	}
 	tmp = localtime(&t);
 	dumptime(tmp);
-	if (*abbr(tmp) != '\0')
-		(void) printf(" %s", abbr(tmp));
-	if (v) {
-		(void) printf(" isdst=%d", tmp->tm_isdst);
+	if (tmp != NULL) {
+		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);
+			(void) printf(" gmtoff=%ld", tmp->TM_GMTOFF);
 #endif /* defined TM_GMTOFF */
+		}
 	}
 	(void) printf("\n");
 }
@@ -394,6 +520,10 @@ register const struct tm *	timeptr;
 	register int		lead;
 	register int		trail;
 
+	if (timeptr == NULL) {
+		(void) printf("NULL");
+		return;
+	}
 	/*
 	** The packaged versions of localtime and gmtime never put out-of-range
 	** values in tm_wday or tm_mon, but since this code might be compiled
diff --git a/elsie.nci.nih.gov/src/zic.c b/elsie.nci.nih.gov/src/zic.c
index 1a046ff..5a044f6 100644
--- a/elsie.nci.nih.gov/src/zic.c
+++ b/elsie.nci.nih.gov/src/zic.c
@@ -1,4 +1,10 @@
-static char	elsieid[] = "@(#)zic.c	7.116";
+static char	elsieid[] = "@(#)zic.c	7.118";
+
+/*
+** Regardless of the type of time_t, we do our work using this type.
+*/
+
+typedef int	zic_t;
 
 #include "private.h"
 #include "locale.h"
@@ -50,7 +56,7 @@ struct rule {
 	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 */
+	zic_t		r_temp;		/* used in outzone */
 };
 
 /*
@@ -76,7 +82,7 @@ struct zone {
 	int		z_nrules;
 
 	struct rule	z_untilrule;
-	time_t		z_untiltime;
+	zic_t		z_untiltime;
 };
 
 extern int	getopt P((int argc, char * const argv[],
@@ -85,10 +91,10 @@ extern int	link P((const char * fromname, const char * toname));
 extern char *	optarg;
 extern int	optind;
 
-static void	addtt P((time_t starttime, int type));
+static void	addtt P((zic_t starttime, int type));
 static int	addtype P((long gmtoff, const char * abbr, int isdst,
 				int ttisstd, int ttisgmt));
-static void	leapadd P((time_t t, int positive, int rolling, int count));
+static void	leapadd P((zic_t t, int positive, int rolling, int count));
 static void	adjleap P((void));
 static void	associate P((void));
 static int	ciequal P((const char * ap, const char * bp));
@@ -121,13 +127,13 @@ 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 void * leftp, const void * rightp));
-static time_t	rpytime P((const struct rule * rp, int wantedy));
+static zic_t	rpytime P((const struct rule * rp, int wantedy));
 static void	rulesub P((struct rule * rp,
 			const char * loyearp, const char * hiyearp,
 			const char * typep, const char * monthp,
 			const char * dayp, const char * timep));
 static void	setboundaries P((void));
-static time_t	tadd P((time_t t1, long t2));
+static zic_t	tadd P((zic_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));
@@ -141,10 +147,10 @@ static int		errors;
 static const char *	filename;
 static int		leapcnt;
 static int		linenum;
-static time_t		max_time;
+static zic_t		max_time;
 static int		max_year;
 static int		max_year_representable;
-static time_t		min_time;
+static zic_t		min_time;
 static int		min_year;
 static int		min_year_representable;
 static int		noise;
@@ -334,7 +340,7 @@ static const int	len_years[2] = {
 };
 
 static struct attype {
-	time_t		at;
+	zic_t		at;
 	unsigned char	type;
 }			attypes[TZ_MAX_TIMES];
 static long		gmtoffs[TZ_MAX_TYPES];
@@ -343,7 +349,7 @@ 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 time_t		trans[TZ_MAX_LEAPS];
+static zic_t		trans[TZ_MAX_LEAPS];
 static long		corr[TZ_MAX_LEAPS];
 static char		roll[TZ_MAX_LEAPS];
 
@@ -665,25 +671,36 @@ warning(_("hard link failed, symbolic link used"));
 */
 
 #define MAX_BITS_IN_FILE	32
-#define TIME_T_BITS_IN_FILE	((TYPE_BIT(time_t) < MAX_BITS_IN_FILE) ? TYPE_BIT(time_t) : MAX_BITS_IN_FILE)
+#define TIME_T_BITS_IN_FILE	((TYPE_BIT(zic_t) < MAX_BITS_IN_FILE) ? \
+					TYPE_BIT(zic_t) : MAX_BITS_IN_FILE)
 
 static void
 setboundaries P((void))
 {
-	if (TYPE_SIGNED(time_t)) {
-		min_time = ~ (time_t) 0;
-		min_time <<= TIME_T_BITS_IN_FILE - 1;
-		max_time = ~ (time_t) 0 - min_time;
+	register int	i;
+
+	if (TYPE_SIGNED(zic_t)) {
+		min_time = -1;
+		for (i = 0; i < TIME_T_BITS_IN_FILE - 1; ++i)
+			min_time *= 2;
+		max_time = -(min_time + 1);
 		if (sflag)
 			min_time = 0;
 	} else {
 		min_time = 0;
 		max_time = 2 - sflag;
-		max_time <<= TIME_T_BITS_IN_FILE - 1;
+		for (i = 0; i < TIME_T_BITS_IN_FILE - 1; ++i)
+			max_time *= 2;
 		--max_time;
 	}
-	min_year = TM_YEAR_BASE + gmtime(&min_time)->tm_year;
-	max_year = TM_YEAR_BASE + gmtime(&max_time)->tm_year;
+	{
+		time_t	t;
+
+		t = (time_t) min_time;
+		min_year = TM_YEAR_BASE + gmtime(&t)->tm_year;
+		t = (time_t) max_time;
+		max_year = TM_YEAR_BASE + gmtime(&t)->tm_year;
+	}
 	min_year_representable = min_year;
 	max_year_representable = max_year;
 }
@@ -1109,7 +1126,7 @@ const int		nfields;
 	register int			i, j;
 	int				year, month, day;
 	long				dayoff, tod;
-	time_t				t;
+	zic_t				t;
 
 	if (nfields != LEAP_FIELDS) {
 		error(_("wrong number of fields on Leap line"));
@@ -1153,7 +1170,7 @@ const int		nfields;
 			return;
 	}
 	dayoff = oadd(dayoff, eitol(day - 1));
-	if (dayoff < 0 && !TYPE_SIGNED(time_t)) {
+	if (dayoff < 0 && !TYPE_SIGNED(zic_t)) {
 		error(_("time before zero"));
 		return;
 	}
@@ -1165,7 +1182,7 @@ const int		nfields;
 		error(_("time too large"));
 		return;
 	}
-	t = (time_t) dayoff * SECSPERDAY;
+	t = (zic_t) dayoff * SECSPERDAY;
 	tod = gethms(fields[LP_TIME], _("invalid time of day"), FALSE);
 	cp = fields[LP_CORR];
 	{
@@ -1427,7 +1444,7 @@ const char * const	name;
 	register int		i, j;
 	static char *		fullname;
 	static struct tzhead	tzh;
-	time_t			ats[TZ_MAX_TIMES];
+	zic_t			ats[TZ_MAX_TIMES];
 	unsigned char		types[TZ_MAX_TIMES];
 
 	/*
@@ -1592,7 +1609,7 @@ const int			zonecount;
 	register struct rule *		rp;
 	register int			i, j;
 	register int			usestart, useuntil;
-	register time_t			starttime, untiltime;
+	register zic_t			starttime, untiltime;
 	register long			gmtoff;
 	register long			stdoff;
 	register int			year;
@@ -1661,7 +1678,7 @@ const int			zonecount;
 			}
 			for ( ; ; ) {
 				register int	k;
-				register time_t	jtime, ktime;
+				register zic_t	jtime, ktime;
 				register long	offset;
 				char		buf[BUFSIZ];
 
@@ -1773,7 +1790,7 @@ error(_("can't determine time zone abbreviation to use just after until time"));
 
 static void
 addtt(starttime, type)
-const time_t	starttime;
+const zic_t	starttime;
 int		type;
 {
 	if (starttime <= min_time ||
@@ -1857,7 +1874,7 @@ const int		ttisgmt;
 
 static void
 leapadd(t, positive, rolling, count)
-const time_t	t;
+const zic_t	t;
 const int	positive;
 const int	rolling;
 int		count;
@@ -2045,12 +2062,12 @@ const long	t2;
 	return t;
 }
 
-static time_t
+static zic_t
 tadd(t1, t2)
-const time_t	t1;
+const zic_t	t1;
 const long	t2;
 {
-	register time_t	t;
+	register zic_t	t;
 
 	if (t1 == max_time && t2 > 0)
 		return max_time;
@@ -2069,14 +2086,14 @@ const long	t2;
 ** 1970, 00:00 LOCAL time - in that year that the rule refers to.
 */
 
-static time_t
+static zic_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;
+	register zic_t	t;
 
 	if (wantedy == INT_MIN)
 		return min_time;
@@ -2143,13 +2160,13 @@ register const int			wantedy;
 				warning(_("rule goes past start/end of month--will not work with pre-2004 versions of zic"));
 		}
 	}
-	if (dayoff < 0 && !TYPE_SIGNED(time_t))
+	if (dayoff < 0 && !TYPE_SIGNED(zic_t))
 		return min_time;
 	if (dayoff < min_time / SECSPERDAY)
 		return min_time;
 	if (dayoff > max_time / SECSPERDAY)
 		return max_time;
-	t = (time_t) dayoff * SECSPERDAY;
+	t = (zic_t) dayoff * SECSPERDAY;
 	return tadd(t, rp->r_tod);
 }