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      1 /*
      2  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
      3  * Use is subject to license terms.
      4  */
      5 
      6 #pragma ident	"%Z%%M%	%I%	%E% SMI"
      7 
      8 /*
      9  * zdump 7.24
     10  * Taken from elsie.nci.nih.gov to replace the existing Solaris zdump,
     11  * which was based on an earlier version of the elsie code.
     12  *
     13  * For zdump 7.24, the following changes were made to the elsie code:
     14  *   locale/textdomain/messages to match existing Solaris style.
     15  *   Solaris verbose mode is documented to display the current time first.
     16  *   cstyle cleaned code.
     17  *   removed old locale/textdomain code.
     18  */
     19 
     20 static char	elsieid[] = "@(#)zdump.c	7.74";
     21 
     22 /*
     23  * This code has been made independent of the rest of the time
     24  * conversion package to increase confidence in the verification it provides.
     25  * You can use this code to help in verifying other implementations.
     26  */
     27 
     28 #include "stdio.h"	/* for stdout, stderr, perror */
     29 #include "string.h"	/* for strcpy */
     30 #include "sys/types.h"	/* for time_t */
     31 #include "time.h"	/* for struct tm */
     32 #include "stdlib.h"	/* for exit, malloc, atoi */
     33 #include "locale.h"	/* for setlocale, textdomain */
     34 #include "libintl.h"
     35 #include <ctype.h>
     36 #include "tzfile.h"	/* for defines */
     37 #include <limits.h>
     38 
     39 #ifndef ZDUMP_LO_YEAR
     40 #define	ZDUMP_LO_YEAR	(-500)
     41 #endif /* !defined ZDUMP_LO_YEAR */
     42 
     43 #ifndef ZDUMP_HI_YEAR
     44 #define	ZDUMP_HI_YEAR	2500
     45 #endif /* !defined ZDUMP_HI_YEAR */
     46 
     47 #ifndef MAX_STRING_LENGTH
     48 #define	MAX_STRING_LENGTH	1024
     49 #endif /* !defined MAX_STRING_LENGTH */
     50 
     51 #ifndef TRUE
     52 #define	TRUE		1
     53 #endif /* !defined TRUE */
     54 
     55 #ifndef FALSE
     56 #define	FALSE		0
     57 #endif /* !defined FALSE */
     58 
     59 #ifndef isleap_sum
     60 /*
     61  * See tzfile.h for details on isleap_sum.
     62  */
     63 #define	isleap_sum(a, b)	isleap((a) % 400 + (b) % 400)
     64 #endif /* !defined isleap_sum */
     65 
     66 #ifndef SECSPERDAY
     67 #define	SECSPERDAY	((long)SECSPERHOUR * HOURSPERDAY)
     68 #endif
     69 #define	SECSPERNYEAR	(SECSPERDAY * DAYSPERNYEAR)
     70 #define	SECSPERLYEAR	(SECSPERNYEAR + SECSPERDAY)
     71 
     72 #ifndef GNUC_or_lint
     73 #ifdef lint
     74 #define	GNUC_or_lint
     75 #else /* !defined lint */
     76 #ifdef __GNUC__
     77 #define	GNUC_or_lint
     78 #endif /* defined __GNUC__ */
     79 #endif /* !defined lint */
     80 #endif /* !defined GNUC_or_lint */
     81 
     82 #ifndef INITIALIZE
     83 #ifdef	GNUC_or_lint
     84 #define	INITIALIZE(x)	((x) = 0)
     85 #else /* !defined GNUC_or_lint */
     86 #define	INITIALIZE(x)
     87 #endif /* !defined GNUC_or_lint */
     88 #endif /* !defined INITIALIZE */
     89 
     90 static time_t	absolute_min_time;
     91 static time_t	absolute_max_time;
     92 static size_t	longest;
     93 static char	*progname;
     94 static int	warned;
     95 
     96 static char	*abbr(struct tm *);
     97 static void	abbrok(const char *, const char *);
     98 static long	delta(struct tm *, struct tm *);
     99 static void	dumptime(const struct tm *);
    100 static time_t	hunt(char *, time_t, time_t);
    101 static void	setabsolutes(void);
    102 static void	show(char *, time_t, int);
    103 static void	usage(void);
    104 static const char	*tformat(void);
    105 static time_t	yeartot(long y);
    106 
    107 #ifndef TYPECHECK
    108 #define	my_localtime	localtime
    109 #else /* !defined TYPECHECK */
    110 static struct tm *
    111 my_localtime(tp)
    112 time_t *tp;
    113 {
    114 	register struct tm *tmp;
    115 
    116 	tmp = localtime(tp);
    117 	if (tp != NULL && tmp != NULL) {
    118 		struct tm	tm;
    119 		register time_t	t;
    120 
    121 		tm = *tmp;
    122 		t = mktime(&tm);
    123 		if (t - *tp >= 1 || *tp - t >= 1) {
    124 			(void) fflush(stdout);
    125 			(void) fprintf(stderr, "\n%s: ", progname);
    126 			(void) fprintf(stderr, tformat(), *tp);
    127 			(void) fprintf(stderr, " ->");
    128 			(void) fprintf(stderr, " year=%d", tmp->tm_year);
    129 			(void) fprintf(stderr, " mon=%d", tmp->tm_mon);
    130 			(void) fprintf(stderr, " mday=%d", tmp->tm_mday);
    131 			(void) fprintf(stderr, " hour=%d", tmp->tm_hour);
    132 			(void) fprintf(stderr, " min=%d", tmp->tm_min);
    133 			(void) fprintf(stderr, " sec=%d", tmp->tm_sec);
    134 			(void) fprintf(stderr, " isdst=%d", tmp->tm_isdst);
    135 			(void) fprintf(stderr, " -> ");
    136 			(void) fprintf(stderr, tformat(), t);
    137 			(void) fprintf(stderr, "\n");
    138 		}
    139 	}
    140 	return (tmp);
    141 }
    142 #endif /* !defined TYPECHECK */
    143 
    144 static void
    145 abbrok(abbrp, zone)
    146 const char * const	abbrp;
    147 const char * const	zone;
    148 {
    149 	register const char *cp;
    150 	int error = 0;
    151 
    152 	if (warned)
    153 		return;
    154 	cp = abbrp;
    155 	while (isascii(*cp) && isalpha((unsigned char)*cp))
    156 		++cp;
    157 	(void) fflush(stdout);
    158 	if (cp - abbrp == 0) {
    159 		/*
    160 		 * TRANSLATION_NOTE
    161 		 * The first %s prints for the program name (zdump),
    162 		 * the second %s prints the timezone name, the third
    163 		 * %s prints the timezone abbreviation (tzname[0] or
    164 		 * tzname[1]).
    165 		 */
    166 		(void) fprintf(stderr, gettext("%s: warning: zone \"%s\" "
    167 		    "abbreviation \"%s\" lacks alphabetic at start\n"),
    168 		    progname, zone, abbrp);
    169 		error = 1;
    170 	} else if (cp - abbrp < 3) {
    171 		(void) fprintf(stderr, gettext("%s: warning: zone \"%s\" "
    172 		    "abbreviation \"%s\" has fewer than 3 alphabetics\n"),
    173 		    progname, zone, abbrp);
    174 		error = 1;
    175 	} else if (cp - abbrp > 6) {
    176 		(void) fprintf(stderr, gettext("%s: warning: zone \"%s\" "
    177 		    "abbreviation \"%s\" has more than 6 alphabetics\n"),
    178 		    progname, zone, abbrp);
    179 		error = 1;
    180 	}
    181 	if (error == 0 && (*cp == '+' || *cp == '-')) {
    182 		++cp;
    183 		if (isascii(*cp) && isdigit((unsigned char)*cp))
    184 			if (*cp++ == '1' && *cp >= '0' && *cp <= '4')
    185 				++cp;
    186 		if (*cp != '\0') {
    187 			(void) fprintf(stderr, gettext("%s: warning: "
    188 			    "zone \"%s\" abbreviation \"%s\" differs from "
    189 			    "POSIX standard\n"), progname, zone, abbrp);
    190 			error = 1;
    191 		}
    192 	}
    193 	if (error)
    194 		warned = TRUE;
    195 }
    196 
    197 int
    198 main(argc, argv)
    199 int	argc;
    200 char	*argv[];
    201 {
    202 	register int		i;
    203 	register int		c;
    204 	register int		vflag;
    205 	register char		*cutarg;
    206 	register long		cutloyear = ZDUMP_LO_YEAR;
    207 	register long		cuthiyear = ZDUMP_HI_YEAR;
    208 	register time_t		cutlotime;
    209 	register time_t		cuthitime;
    210 	time_t			now;
    211 	time_t			t;
    212 	time_t			newt;
    213 	struct tm		tm;
    214 	struct tm		newtm;
    215 	register struct tm	*tmp;
    216 	register struct tm	*newtmp;
    217 
    218 	INITIALIZE(cutlotime);
    219 	INITIALIZE(cuthitime);
    220 
    221 	(void) setlocale(LC_ALL, "");
    222 #if !defined(TEXT_DOMAIN)		/* Should be defined by cc -D */
    223 #define	TEXT_DOMAIN	"SYS_TEST"	/* Use this only if it weren't */
    224 #endif
    225 	(void) textdomain(TEXT_DOMAIN);
    226 
    227 	progname = argv[0];
    228 	for (i = 1; i < argc; ++i)
    229 		if (strcmp(argv[i], "--version") == 0) {
    230 			(void) printf("%s\n", elsieid);
    231 			exit(EXIT_SUCCESS);
    232 		}
    233 	vflag = 0;
    234 	cutarg = NULL;
    235 	while ((c = getopt(argc, argv, "c:v")) == 'c' || c == 'v')
    236 		if (c == 'v')
    237 			vflag = 1;
    238 		else	cutarg = optarg;
    239 	if (c != EOF ||
    240 		(optind == argc - 1 && strcmp(argv[optind], "=") == 0)) {
    241 			usage();
    242 			/* NOTREACHED */
    243 	}
    244 	if (vflag) {
    245 		if (cutarg != NULL) {
    246 			long	lo;
    247 			long	hi;
    248 			char	dummy;
    249 
    250 			if (sscanf(cutarg, "%ld%c", &hi, &dummy) == 1) {
    251 				cuthiyear = hi;
    252 			} else if (sscanf(cutarg, "%ld,%ld%c",
    253 				&lo, &hi, &dummy) == 2) {
    254 					cutloyear = lo;
    255 					cuthiyear = hi;
    256 			} else {
    257 (void) fprintf(stderr, gettext("%s: wild -c argument %s\n"),
    258 					progname, cutarg);
    259 				exit(EXIT_FAILURE);
    260 			}
    261 		}
    262 		setabsolutes();
    263 		cutlotime = yeartot(cutloyear);
    264 		cuthitime = yeartot(cuthiyear);
    265 	}
    266 	(void) time(&now);
    267 	longest = 0;
    268 	for (i = optind; i < argc; ++i)
    269 		if (strlen(argv[i]) > longest)
    270 			longest = strlen(argv[i]);
    271 
    272 	for (i = optind; i < argc; ++i) {
    273 		static char	buf[MAX_STRING_LENGTH];
    274 		static char	*tzp = NULL;
    275 
    276 		(void) unsetenv("TZ");
    277 		if (tzp != NULL)
    278 			free(tzp);
    279 		if ((tzp = malloc(3 + strlen(argv[i]) + 1)) == NULL) {
    280 			perror(progname);
    281 			exit(EXIT_FAILURE);
    282 		}
    283 		(void) strcpy(tzp, "TZ=");
    284 		(void) strcat(tzp, argv[i]);
    285 		if (putenv(tzp) != 0) {
    286 			perror(progname);
    287 			exit(EXIT_FAILURE);
    288 		}
    289 		if (!vflag) {
    290 			show(argv[i], now, FALSE);
    291 			continue;
    292 		}
    293 
    294 #if defined(sun)
    295 		/*
    296 		 * We show the current time first, probably because we froze
    297 		 * the behavior of zdump some time ago and then it got
    298 		 * changed.
    299 		 */
    300 		show(argv[i], now, TRUE);
    301 #endif
    302 		warned = FALSE;
    303 		t = absolute_min_time;
    304 		show(argv[i], t, TRUE);
    305 		t += SECSPERHOUR * HOURSPERDAY;
    306 		show(argv[i], t, TRUE);
    307 		if (t < cutlotime)
    308 			t = cutlotime;
    309 		tmp = my_localtime(&t);
    310 		if (tmp != NULL) {
    311 			tm = *tmp;
    312 			(void) strncpy(buf, abbr(&tm), sizeof (buf) - 1);
    313 		}
    314 		for (;;) {
    315 			if (t >= cuthitime)
    316 				break;
    317 			newt = t + SECSPERHOUR * 12;
    318 			if (newt >= cuthitime)
    319 				break;
    320 			if (newt <= t)
    321 				break;
    322 			newtmp = localtime(&newt);
    323 			if (newtmp != NULL)
    324 				newtm = *newtmp;
    325 			if ((tmp == NULL || newtmp == NULL) ? (tmp != newtmp) :
    326 				(delta(&newtm, &tm) != (newt - t) ||
    327 				newtm.tm_isdst != tm.tm_isdst ||
    328 				strcmp(abbr(&newtm), buf) != 0)) {
    329 					newt = hunt(argv[i], t, newt);
    330 					newtmp = localtime(&newt);
    331 					if (newtmp != NULL) {
    332 						newtm = *newtmp;
    333 						(void) strncpy(buf,
    334 							abbr(&newtm),
    335 							sizeof (buf) - 1);
    336 					}
    337 			}
    338 			t = newt;
    339 			tm = newtm;
    340 			tmp = newtmp;
    341 		}
    342 		t = absolute_max_time;
    343 #if defined(sun)
    344 		show(argv[i], t, TRUE);
    345 		t -= SECSPERHOUR * HOURSPERDAY;
    346 		show(argv[i], t, TRUE);
    347 #else /* !defined(sun) */
    348 		t -= SECSPERHOUR * HOURSPERDAY;
    349 		show(argv[i], t, TRUE);
    350 		t += SECSPERHOUR * HOURSPERDAY;
    351 		show(argv[i], t, TRUE);
    352 #endif /* !defined(sun) */
    353 	}
    354 	if (fflush(stdout) || ferror(stdout)) {
    355 		(void) fprintf(stderr, "%s: ", progname);
    356 		(void) perror(gettext("Error writing standard output"));
    357 		exit(EXIT_FAILURE);
    358 	}
    359 	return (EXIT_SUCCESS);
    360 }
    361 
    362 static void
    363 setabsolutes()
    364 {
    365 #if defined(sun)
    366 	absolute_min_time = LONG_MIN;
    367 	absolute_max_time = LONG_MAX;
    368 #else
    369 	if (0.5 == (time_t)0.5) {
    370 		/*
    371 		 * time_t is floating.
    372 		 */
    373 		if (sizeof (time_t) == sizeof (float)) {
    374 			absolute_min_time = (time_t)-FLT_MAX;
    375 			absolute_max_time = (time_t)FLT_MAX;
    376 		} else if (sizeof (time_t) == sizeof (double)) {
    377 			absolute_min_time = (time_t)-DBL_MAX;
    378 			absolute_max_time = (time_t)DBL_MAX;
    379 		} else {
    380 			(void) fprintf(stderr, gettext("%s: use of -v on "
    381 			    "system with floating time_t other than float "
    382 			    "or double\n"), progname);
    383 			exit(EXIT_FAILURE);
    384 		}
    385 	} else
    386 	/*CONSTANTCONDITION*/
    387 	if (0 > (time_t)-1) {
    388 		/*
    389 		 * time_t is signed.
    390 		 */
    391 		register time_t	hibit;
    392 
    393 		for (hibit = 1; (hibit * 2) != 0; hibit *= 2)
    394 			continue;
    395 		absolute_min_time = hibit;
    396 		absolute_max_time = -(hibit + 1);
    397 	} else {
    398 		/*
    399 		 * time_t is unsigned.
    400 		 */
    401 		absolute_min_time = 0;
    402 		absolute_max_time = absolute_min_time - 1;
    403 	}
    404 #endif
    405 }
    406 
    407 static time_t
    408 yeartot(y)
    409 const long	y;
    410 {
    411 	register long	myy;
    412 	register long	seconds;
    413 	register time_t	t;
    414 
    415 	myy = EPOCH_YEAR;
    416 	t = 0;
    417 	while (myy != y) {
    418 		if (myy < y) {
    419 			seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
    420 			++myy;
    421 			if (t > absolute_max_time - seconds) {
    422 				t = absolute_max_time;
    423 				break;
    424 			}
    425 			t += seconds;
    426 		} else {
    427 			--myy;
    428 			seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
    429 			if (t < absolute_min_time + seconds) {
    430 				t = absolute_min_time;
    431 				break;
    432 			}
    433 			t -= seconds;
    434 		}
    435 	}
    436 	return (t);
    437 }
    438 
    439 static time_t
    440 hunt(name, lot, hit)
    441 char	*name;
    442 time_t	lot;
    443 time_t	hit;
    444 {
    445 	time_t			t;
    446 	long			diff;
    447 	struct tm		lotm;
    448 	register struct tm	*lotmp;
    449 	struct tm		tm;
    450 	register struct tm	*tmp;
    451 	char			loab[MAX_STRING_LENGTH];
    452 
    453 	lotmp = my_localtime(&lot);
    454 	if (lotmp != NULL) {
    455 		lotm = *lotmp;
    456 		(void) strncpy(loab, abbr(&lotm), sizeof (loab) - 1);
    457 	}
    458 	for (;;) {
    459 		diff = (long)(hit - lot);
    460 		if (diff < 2)
    461 			break;
    462 		t = lot;
    463 		t += diff / 2;
    464 		if (t <= lot)
    465 			++t;
    466 		else if (t >= hit)
    467 			--t;
    468 		tmp = my_localtime(&t);
    469 		if (tmp != NULL)
    470 			tm = *tmp;
    471 		if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) :
    472 			(delta(&tm, &lotm) == (t - lot) &&
    473 			tm.tm_isdst == lotm.tm_isdst &&
    474 			strcmp(abbr(&tm), loab) == 0)) {
    475 				lot = t;
    476 				lotm = tm;
    477 				lotmp = tmp;
    478 		} else	hit = t;
    479 	}
    480 	show(name, lot, TRUE);
    481 	show(name, hit, TRUE);
    482 	return (hit);
    483 }
    484 
    485 /*
    486  * Thanks to Paul Eggert for logic used in delta.
    487  */
    488 
    489 static long
    490 delta(newp, oldp)
    491 struct tm	*newp;
    492 struct tm	*oldp;
    493 {
    494 	register long	result;
    495 	register int	tmy;
    496 
    497 	if (newp->tm_year < oldp->tm_year)
    498 		return (-delta(oldp, newp));
    499 	result = 0;
    500 	for (tmy = oldp->tm_year; tmy < newp->tm_year; ++tmy)
    501 		result += DAYSPERNYEAR + isleap_sum(tmy, TM_YEAR_BASE);
    502 	result += newp->tm_yday - oldp->tm_yday;
    503 	result *= HOURSPERDAY;
    504 	result += newp->tm_hour - oldp->tm_hour;
    505 	result *= MINSPERHOUR;
    506 	result += newp->tm_min - oldp->tm_min;
    507 	result *= SECSPERMIN;
    508 	result += newp->tm_sec - oldp->tm_sec;
    509 	return (result);
    510 }
    511 
    512 static void
    513 show(zone, t, v)
    514 char	*zone;
    515 time_t	t;
    516 int	v;
    517 {
    518 	register struct tm	*tmp;
    519 
    520 	(void) printf("%-*s  ", (int)longest, zone);
    521 	if (v) {
    522 		tmp = gmtime(&t);
    523 		if (tmp == NULL) {
    524 			(void) printf(tformat(), t);
    525 		} else {
    526 			dumptime(tmp);
    527 			(void) printf(" UTC");
    528 		}
    529 		(void) printf(" = ");
    530 	}
    531 	tmp = my_localtime(&t);
    532 	dumptime(tmp);
    533 	if (tmp != NULL) {
    534 		if (*abbr(tmp) != '\0')
    535 			(void) printf(" %s", abbr(tmp));
    536 		if (v) {
    537 			(void) printf(" isdst=%d", tmp->tm_isdst);
    538 #ifdef TM_GMTOFF
    539 			(void) printf(" gmtoff=%ld", tmp->TM_GMTOFF);
    540 #endif /* defined TM_GMTOFF */
    541 		}
    542 	}
    543 	(void) printf("\n");
    544 	if (tmp != NULL && *abbr(tmp) != '\0')
    545 		abbrok(abbr(tmp), zone);
    546 }
    547 
    548 static char *
    549 abbr(tmp)
    550 struct tm	*tmp;
    551 {
    552 	register char	*result;
    553 	static char	nada;
    554 
    555 	if (tmp->tm_isdst != 0 && tmp->tm_isdst != 1)
    556 		return (&nada);
    557 	result = tzname[tmp->tm_isdst];
    558 	return ((result == NULL) ? &nada : result);
    559 }
    560 
    561 /*
    562  * The code below can fail on certain theoretical systems;
    563  * it works on all known real-world systems as of 2004-12-30.
    564  */
    565 
    566 static const char *
    567 tformat()
    568 {
    569 #if defined(sun)
    570 	/* time_t is signed long */
    571 	return ("%ld");
    572 #else
    573 	/*CONSTANTCONDITION*/
    574 	if (0.5 == (time_t)0.5) {	/* floating */
    575 		/*CONSTANTCONDITION*/
    576 		if (sizeof (time_t) > sizeof (double))
    577 			return ("%Lg");
    578 		return ("%g");
    579 	}
    580 	/*CONSTANTCONDITION*/
    581 	if (0 > (time_t)-1) {		/* signed */
    582 		/*CONSTANTCONDITION*/
    583 		if (sizeof (time_t) > sizeof (long))
    584 			return ("%lld");
    585 		/*CONSTANTCONDITION*/
    586 		if (sizeof (time_t) > sizeof (int))
    587 			return ("%ld");
    588 		return ("%d");
    589 	}
    590 	/*CONSTANTCONDITION*/
    591 	if (sizeof (time_t) > sizeof (unsigned long))
    592 		return ("%llu");
    593 	/*CONSTANTCONDITION*/
    594 	if (sizeof (time_t) > sizeof (unsigned int))
    595 		return ("%lu");
    596 	return ("%u");
    597 #endif
    598 }
    599 
    600 static void
    601 dumptime(timeptr)
    602 register const struct tm	*timeptr;
    603 {
    604 	static const char	wday_name[][3] = {
    605 		"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
    606 	};
    607 	static const char	mon_name[][3] = {
    608 		"Jan", "Feb", "Mar", "Apr", "May", "Jun",
    609 		"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
    610 	};
    611 	register const char	*wn;
    612 	register const char	*mn;
    613 	register int		lead;
    614 	register int		trail;
    615 
    616 	if (timeptr == NULL) {
    617 		(void) printf("NULL");
    618 		return;
    619 	}
    620 	/*
    621 	 * The packaged versions of localtime and gmtime never put out-of-range
    622 	 * values in tm_wday or tm_mon, but since this code might be compiled
    623 	 * with other (perhaps experimental) versions, paranoia is in order.
    624 	 */
    625 	if (timeptr->tm_wday < 0 || timeptr->tm_wday >=
    626 		(int)(sizeof (wday_name) / sizeof (wday_name[0])))
    627 			wn = "???";
    628 	else		wn = wday_name[timeptr->tm_wday];
    629 	if (timeptr->tm_mon < 0 || timeptr->tm_mon >=
    630 		(int)(sizeof (mon_name) / sizeof (mon_name[0])))
    631 			mn = "???";
    632 	else		mn = mon_name[timeptr->tm_mon];
    633 	(void) printf("%.3s %.3s%3d %.2d:%.2d:%.2d ",
    634 		wn, mn,
    635 		timeptr->tm_mday, timeptr->tm_hour,
    636 		timeptr->tm_min, timeptr->tm_sec);
    637 #define	DIVISOR	10
    638 	trail = timeptr->tm_year % DIVISOR + TM_YEAR_BASE % DIVISOR;
    639 	lead = timeptr->tm_year / DIVISOR + TM_YEAR_BASE / DIVISOR +
    640 		trail / DIVISOR;
    641 	trail %= DIVISOR;
    642 	if (trail < 0 && lead > 0) {
    643 		trail += DIVISOR;
    644 		--lead;
    645 	} else if (lead < 0 && trail > 0) {
    646 		trail -= DIVISOR;
    647 		++lead;
    648 	}
    649 	if (lead == 0)
    650 		(void) printf("%d", trail);
    651 	else
    652 		(void) printf("%d%d", lead, ((trail < 0) ? -trail : trail));
    653 }
    654 
    655 static void
    656 usage()
    657 {
    658 	(void) fprintf(stderr, gettext(
    659 	    "%s: [ --version ] [ -v ] [ -c [loyear,]hiyear ] zonename ...\n"),
    660 		progname);
    661 	exit(EXIT_FAILURE);
    662 	/* NOTREACHED */
    663 }
    664