[apple/system_cmds.git] / zdump.tproj / zdump.c

static const char	elsieid[] = "@(#)zdump.c	7.31";

#ifndef lint
static const char rcsid[] =
  "$FreeBSD: src/usr.sbin/zic/zdump.c,v 1.9 2004/06/20 21:41:11 stefanf Exp $";
#endif /* not 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 <err.h>
#include <stdio.h>	/* for stdout, stderr */
#include <stdlib.h>	/* for exit, malloc, atoi */
#include <string.h>	/* for strcpy */
#include <sys/types.h>	/* for time_t */
#include <time.h>	/* for struct tm */
#include <unistd.h>

#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 MINSPERHOUR
#define MINSPERHOUR	60
#endif /* !defined MINSPERHOUR */

#ifndef SECSPERHOUR
#define SECSPERHOUR	(SECSPERMIN * MINSPERHOUR)
#endif /* !defined SECSPERHOUR */

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

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

#ifndef TM_YEAR_BASE
#define TM_YEAR_BASE	1900
#endif /* !defined TM_YEAR_BASE */

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

#ifndef isleap
#define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
#endif /* !defined isleap */

#if HAVE_GETTEXT - 0
#include "locale.h"	/* for setlocale */
#include "libintl.h"
#endif /* HAVE_GETTEXT - 0 */

#ifndef GNUC_or_lint
#ifdef lint
#define GNUC_or_lint
#endif /* defined lint */
#ifndef lint
#ifdef __GNUC__
#define GNUC_or_lint
#endif /* defined __GNUC__ */
#endif /* !defined lint */
#endif /* !defined GNUC_or_lint */

#ifndef INITIALIZE
#ifdef GNUC_or_lint
#define INITIALIZE(x)	((x) = 0)
#endif /* defined GNUC_or_lint */
#ifndef GNUC_or_lint
#define INITIALIZE(x)
#endif /* !defined GNUC_or_lint */
#endif /* !defined INITIALIZE */

/*
** For the benefit of GNU folk...
** `_(MSGID)' uses the current locale's message library string for MSGID.
** The default is to use gettext if available, and use MSGID otherwise.
*/

#ifndef _
#if HAVE_GETTEXT - 0
#define _(msgid) gettext(msgid)
#else /* !(HAVE_GETTEXT - 0) */
#define _(msgid) msgid
#endif /* !(HAVE_GETTEXT - 0) */
#endif /* !defined _ */

#ifndef TZ_DOMAIN
#define TZ_DOMAIN "tz"
#endif /* !defined TZ_DOMAIN */

#ifndef P
#ifdef __STDC__
#define P(x)	x
#endif /* defined __STDC__ */
#ifndef __STDC__
#define P(x)	()
#endif /* !defined __STDC__ */
#endif /* !defined P */

extern char **	environ;
extern char *	tzname[2];

static char *	abbr P((struct tm * tmp));
static long	delta P((struct tm * newp, struct tm * oldp));
static time_t	hunt P((char * name, time_t lot, time_t	hit));
static size_t	longest;
static void	show P((char * zone, time_t t, int v));
static void     usage(void);

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

	INITIALIZE(cuttime);
#if HAVE_GETTEXT - 0
	(void) setlocale(LC_MESSAGES, "");
#ifdef TZ_DOMAINDIR
	(void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR);
#endif /* defined(TEXTDOMAINDIR) */
	(void) textdomain(TZ_DOMAIN);
#endif /* HAVE_GETTEXT - 0 */
	for (i = 1; i < argc; ++i)
		if (strcmp(argv[i], "--version") == 0) {
			errx(EXIT_SUCCESS, "%s", elsieid);
		}
	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 && c != -1) ||
		(optind == argc - 1 && strcmp(argv[optind], "=") == 0)) {
			usage();
	}
	if (cutoff != NULL) {
		int	y;

		cutyear = atoi(cutoff);
		cuttime = 0;
		for (y = EPOCH_YEAR; y < cutyear; ++y)
			cuttime += DAYSPERNYEAR + isleap(y);
		cuttime *= SECSPERHOUR * HOURSPERDAY;
	}
	(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)
			continue;
		fakeenv = (char **) malloc((size_t) ((i + 2) *
			sizeof *fakeenv));
		if (fakeenv == NULL ||
			(fakeenv[0] = (char *) malloc((size_t) (longest +
				4))) == NULL)
					errx(EXIT_FAILURE,
					     _("malloc() failed"));
		to = 0;
		(void) strcpy(fakeenv[to++], "TZ=");
		for (from = 0; environ[from] != NULL; ++from)
			if (strncmp(environ[from], "TZ=", 3) != 0)
				fakeenv[to++] = environ[from];
		fakeenv[to] = NULL;
		environ = fakeenv;
	}
	for (i = optind; i < argc; ++i) {
		static char	buf[MAX_STRING_LENGTH];

		(void) strcpy(&fakeenv[0][3], argv[i]);
		if (!vflag) {
			show(argv[i], now, FALSE);
			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) {
					newt = hunt(argv[i], t, newt);
					newtm = *localtime(&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))
		errx(EXIT_FAILURE, _("error writing standard output"));
	exit(EXIT_SUCCESS);

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

static void
usage(void)
{
	fprintf(stderr,
_("usage: zdump [--version] [-v] [-c cutoff] zonename ...\n"));
	exit(EXIT_FAILURE);
}

static time_t
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);
	return hit;
}

/*
** Thanks to Paul Eggert (eggert@twinsun.com) for logic used in delta.
*/

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

	if (newp->tm_year < oldp->tm_year)
		return -delta(oldp, newp);
	result = 0;
	for (tmy = oldp->tm_year; tmy < newp->tm_year; ++tmy)
		result += DAYSPERNYEAR + isleap(tmy + TM_YEAR_BASE);
	result += newp->tm_yday - oldp->tm_yday;
	result *= HOURSPERDAY;
	result += newp->tm_hour - oldp->tm_hour;
	result *= MINSPERHOUR;
	result += newp->tm_min - oldp->tm_min;
	result *= SECSPERMIN;
	result += newp->tm_sec - oldp->tm_sec;
	return result;
}

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

	(void) printf("%-*s  ", (int) longest, zone);
	if (v)
		(void) printf("%.24s UTC = ", 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;
	static char	nada;

	if (tmp->tm_isdst != 0 && tmp->tm_isdst != 1)
		return &nada;
	result = tzname[tmp->tm_isdst];
	return (result == NULL) ? &nada : result;
}
Commit	Line	Data
2fc1e207 A	1	static const char elsieid[] = "@(#)zdump.c 7.31";
	2
	3	#ifndef lint
	4	static const char rcsid[] =
	5	"$FreeBSD: src/usr.sbin/zic/zdump.c,v 1.9 2004/06/20 21:41:11 stefanf Exp $";
	6	#endif /* not lint */
1815bff5 A	7
	8	/*
	9	** This code has been made independent of the rest of the time
	10	** conversion package to increase confidence in the verification it provides.
	11	** You can use this code to help in verifying other implementations.
	12	*/
	13
2fc1e207 A	14	#include <err.h>
	15	#include <stdio.h> /* for stdout, stderr */
	16	#include <stdlib.h> /* for exit, malloc, atoi */
	17	#include <string.h> /* for strcpy */
	18	#include <sys/types.h> /* for time_t */
	19	#include <time.h> /* for struct tm */
	20	#include <unistd.h>
1815bff5 A	21
	22	#ifndef MAX_STRING_LENGTH
	23	#define MAX_STRING_LENGTH 1024
	24	#endif /* !defined MAX_STRING_LENGTH */
	25
	26	#ifndef TRUE
	27	#define TRUE 1
	28	#endif /* !defined TRUE */
	29
	30	#ifndef FALSE
	31	#define FALSE 0
	32	#endif /* !defined FALSE */
	33
	34	#ifndef EXIT_SUCCESS
	35	#define EXIT_SUCCESS 0
	36	#endif /* !defined EXIT_SUCCESS */
	37
	38	#ifndef EXIT_FAILURE
	39	#define EXIT_FAILURE 1
	40	#endif /* !defined EXIT_FAILURE */
	41
	42	#ifndef SECSPERMIN
	43	#define SECSPERMIN 60
	44	#endif /* !defined SECSPERMIN */
	45
	46	#ifndef MINSPERHOUR
	47	#define MINSPERHOUR 60
	48	#endif /* !defined MINSPERHOUR */
	49
	50	#ifndef SECSPERHOUR
	51	#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
	52	#endif /* !defined SECSPERHOUR */
	53
	54	#ifndef HOURSPERDAY
	55	#define HOURSPERDAY 24
	56	#endif /* !defined HOURSPERDAY */
	57
	58	#ifndef EPOCH_YEAR
	59	#define EPOCH_YEAR 1970
	60	#endif /* !defined EPOCH_YEAR */
	61
	62	#ifndef TM_YEAR_BASE
	63	#define TM_YEAR_BASE 1900
	64	#endif /* !defined TM_YEAR_BASE */
	65
	66	#ifndef DAYSPERNYEAR
	67	#define DAYSPERNYEAR 365
	68	#endif /* !defined DAYSPERNYEAR */
	69
	70	#ifndef isleap
	71	#define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) \|\| ((y) % 400) == 0)
	72	#endif /* !defined isleap */
	73
	74	#if HAVE_GETTEXT - 0
	75	#include "locale.h" /* for setlocale */
	76	#include "libintl.h"
	77	#endif /* HAVE_GETTEXT - 0 */
	78
	79	#ifndef GNUC_or_lint
	80	#ifdef lint
	81	#define GNUC_or_lint
	82	#endif /* defined lint */
	83	#ifndef lint
	84	#ifdef __GNUC__
85	#define GNUC_or_lint
86	#endif /* defined __GNUC__ */
87	#endif /* !defined lint */
88	#endif /* !defined GNUC_or_lint */
89
90	#ifndef INITIALIZE
91	#ifdef GNUC_or_lint
92	#define INITIALIZE(x) ((x) = 0)
93	#endif /* defined GNUC_or_lint */
94	#ifndef GNUC_or_lint
95	#define INITIALIZE(x)
96	#endif /* !defined GNUC_or_lint */
97	#endif /* !defined INITIALIZE */
98
99	/*
100	** For the benefit of GNU folk...
101	** `_(MSGID)' uses the current locale's message library string for MSGID.
102	** The default is to use gettext if available, and use MSGID otherwise.
103	*/
104
105	#ifndef _
106	#if HAVE_GETTEXT - 0
107	#define _(msgid) gettext(msgid)
108	#else /* !(HAVE_GETTEXT - 0) */
109	#define _(msgid) msgid
110	#endif /* !(HAVE_GETTEXT - 0) */
111	#endif /* !defined _ */
112
113	#ifndef TZ_DOMAIN
114	#define TZ_DOMAIN "tz"
115	#endif /* !defined TZ_DOMAIN */
116
2fc1e207 A	117	#ifndef P
	118	#ifdef __STDC__
	119	#define P(x) x
	120	#endif /* defined __STDC__ */
	121	#ifndef __STDC__
	122	#define P(x) ()
	123	#endif /* !defined __STDC__ */
	124	#endif /* !defined P */
	125
1815bff5	126	extern char ** environ;
1815bff5 A	127	extern char * tzname[2];
1815bff5 A	128
2fc1e207 A	129	static char * abbr P((struct tm * tmp));
	130	static long delta P((struct tm * newp, struct tm * oldp));
	131	static time_t hunt P((char * name, time_t lot, time_t hit));
	132	static size_t longest;
	133	static void show P((char * zone, time_t t, int v));
	134	static void usage(void);
1815bff5 A	135
	136	int
	137	main(argc, argv)
	138	int argc;
	139	char * argv[];
	140	{
	141	register int i;
	142	register int c;
	143	register int vflag;
	144	register char * cutoff;
	145	register int cutyear;
	146	register long cuttime;
	147	char ** fakeenv;
	148	time_t now;
	149	time_t t;
	150	time_t newt;
	151	time_t hibit;
	152	struct tm tm;
	153	struct tm newtm;
	154
	155	INITIALIZE(cuttime);
	156	#if HAVE_GETTEXT - 0
	157	(void) setlocale(LC_MESSAGES, "");
	158	#ifdef TZ_DOMAINDIR
	159	(void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR);
	160	#endif /* defined(TEXTDOMAINDIR) */
	161	(void) textdomain(TZ_DOMAIN);
	162	#endif /* HAVE_GETTEXT - 0 */
2fc1e207 A	163	for (i = 1; i < argc; ++i)
	164	if (strcmp(argv[i], "--version") == 0) {
	165	errx(EXIT_SUCCESS, "%s", elsieid);
	166	}
1815bff5 A	167	vflag = 0;
	168	cutoff = NULL;
	169	while ((c = getopt(argc, argv, "c:v")) == 'c' \|\| c == 'v')
	170	if (c == 'v')
	171	vflag = 1;
	172	else cutoff = optarg;
2fc1e207	173	if ((c != EOF && c != -1) \|\|
1815bff5	174	(optind == argc - 1 && strcmp(argv[optind], "=") == 0)) {
2fc1e207	175	usage();
1815bff5 A	176	}
	177	if (cutoff != NULL) {
	178	int y;
	179
	180	cutyear = atoi(cutoff);
	181	cuttime = 0;
	182	for (y = EPOCH_YEAR; y < cutyear; ++y)
	183	cuttime += DAYSPERNYEAR + isleap(y);
	184	cuttime = SECSPERHOUR HOURSPERDAY;
	185	}
	186	(void) time(&now);
	187	longest = 0;
	188	for (i = optind; i < argc; ++i)
	189	if (strlen(argv[i]) > longest)
	190	longest = strlen(argv[i]);
	191	for (hibit = 1; (hibit << 1) != 0; hibit <<= 1)
	192	continue;
	193	{
	194	register int from;
	195	register int to;
	196
	197	for (i = 0; environ[i] != NULL; ++i)
	198	continue;
	199	fakeenv = (char *) malloc((size_t) ((i + 2)
	200	sizeof *fakeenv));
	201	if (fakeenv == NULL \|\|
	202	(fakeenv[0] = (char *) malloc((size_t) (longest +
2fc1e207 A	203	4))) == NULL)
	204	errx(EXIT_FAILURE,
	205	_("malloc() failed"));
1815bff5 A	206	to = 0;
	207	(void) strcpy(fakeenv[to++], "TZ=");
	208	for (from = 0; environ[from] != NULL; ++from)
	209	if (strncmp(environ[from], "TZ=", 3) != 0)
	210	fakeenv[to++] = environ[from];
	211	fakeenv[to] = NULL;
	212	environ = fakeenv;
	213	}
	214	for (i = optind; i < argc; ++i) {
	215	static char buf[MAX_STRING_LENGTH];
	216
	217	(void) strcpy(&fakeenv[0][3], argv[i]);
2fc1e207 A	218	if (!vflag) {
2fc1e207 A	219	show(argv[i], now, FALSE);
1815bff5	220	continue;
2fc1e207	221	}
1815bff5 A	222	/*
	223	** Get lowest value of t.
	224	*/
	225	t = hibit;
	226	if (t > 0) /* time_t is unsigned */
	227	t = 0;
	228	show(argv[i], t, TRUE);
	229	t += SECSPERHOUR * HOURSPERDAY;
	230	show(argv[i], t, TRUE);
	231	tm = *localtime(&t);
	232	(void) strncpy(buf, abbr(&tm), (sizeof buf) - 1);
	233	for ( ; ; ) {
	234	if (cutoff != NULL && t >= cuttime)
	235	break;
	236	newt = t + SECSPERHOUR * 12;
	237	if (cutoff != NULL && newt >= cuttime)
	238	break;
	239	if (newt <= t)
	240	break;
	241	newtm = *localtime(&newt);
	242	if (delta(&newtm, &tm) != (newt - t) \|\|
	243	newtm.tm_isdst != tm.tm_isdst \|\|
	244	strcmp(abbr(&newtm), buf) != 0) {
	245	newt = hunt(argv[i], t, newt);
	246	newtm = *localtime(&newt);
	247	(void) strncpy(buf, abbr(&newtm),
	248	(sizeof buf) - 1);
	249	}
	250	t = newt;
	251	tm = newtm;
	252	}
	253	/*
	254	** Get highest value of t.
	255	*/
	256	t = ~((time_t) 0);
	257	if (t < 0) /* time_t is signed */
	258	t &= ~hibit;
	259	t -= SECSPERHOUR * HOURSPERDAY;
	260	show(argv[i], t, TRUE);
	261	t += SECSPERHOUR * HOURSPERDAY;
	262	show(argv[i], t, TRUE);
	263	}
2fc1e207 A	264	if (fflush(stdout) \|\| ferror(stdout))
2fc1e207 A	265	errx(EXIT_FAILURE, _("error writing standard output"));
1815bff5 A	266	exit(EXIT_SUCCESS);
	267
	268	/* gcc -Wall pacifier */
	269	for ( ; ; )
	270	continue;
	271	}
	272
2fc1e207 A	273	static void
	274	usage(void)
	275	{
	276	fprintf(stderr,
	277	_("usage: zdump [--version] [-v] [-c cutoff] zonename ...\n"));
	278	exit(EXIT_FAILURE);
	279	}
	280
1815bff5 A	281	static time_t
	282	hunt(name, lot, hit)
	283	char * name;
	284	time_t lot;
	285	time_t hit;
	286	{
	287	time_t t;
	288	struct tm lotm;
	289	struct tm tm;
	290	static char loab[MAX_STRING_LENGTH];
	291
	292	lotm = *localtime(&lot);
	293	(void) strncpy(loab, abbr(&lotm), (sizeof loab) - 1);
1815bff5 A	294	while ((hit - lot) >= 2) {
	295	t = lot / 2 + hit / 2;
	296	if (t <= lot)
	297	++t;
	298	else if (t >= hit)
	299	--t;
	300	tm = *localtime(&t);
	301	if (delta(&tm, &lotm) == (t - lot) &&
	302	tm.tm_isdst == lotm.tm_isdst &&
	303	strcmp(abbr(&tm), loab) == 0) {
	304	lot = t;
	305	lotm = tm;
	306	} else hit = t;
	307	}
	308	show(name, lot, TRUE);
	309	show(name, hit, TRUE);
	310	return hit;
	311	}
	312
	313	/*
	314	** Thanks to Paul Eggert (eggert@twinsun.com) for logic used in delta.
	315	*/
	316
	317	static long
	318	delta(newp, oldp)
	319	struct tm * newp;
	320	struct tm * oldp;
	321	{
	322	long result;
	323	int tmy;
	324
	325	if (newp->tm_year < oldp->tm_year)
	326	return -delta(oldp, newp);
	327	result = 0;
	328	for (tmy = oldp->tm_year; tmy < newp->tm_year; ++tmy)
	329	result += DAYSPERNYEAR + isleap(tmy + TM_YEAR_BASE);
	330	result += newp->tm_yday - oldp->tm_yday;
	331	result *= HOURSPERDAY;
	332	result += newp->tm_hour - oldp->tm_hour;
	333	result *= MINSPERHOUR;
	334	result += newp->tm_min - oldp->tm_min;
	335	result *= SECSPERMIN;
	336	result += newp->tm_sec - oldp->tm_sec;
	337	return result;
	338	}
	339
1815bff5 A	340	static void
	341	show(zone, t, v)
	342	char * zone;
	343	time_t t;
	344	int v;
	345	{
	346	struct tm * tmp;
	347
2fc1e207	348	(void) printf("%-*s ", (int) longest, zone);
1815bff5	349	if (v)
2fc1e207	350	(void) printf("%.24s UTC = ", asctime(gmtime(&t)));
1815bff5 A	351	tmp = localtime(&t);
	352	(void) printf("%.24s", asctime(tmp));
	353	if (*abbr(tmp) != '\0')
	354	(void) printf(" %s", abbr(tmp));
	355	if (v) {
	356	(void) printf(" isdst=%d", tmp->tm_isdst);
	357	#ifdef TM_GMTOFF
	358	(void) printf(" gmtoff=%ld", tmp->TM_GMTOFF);
	359	#endif /* defined TM_GMTOFF */
	360	}
	361	(void) printf("\n");
	362	}
	363
	364	static char *
	365	abbr(tmp)
	366	struct tm * tmp;
	367	{
	368	register char * result;
	369	static char nada;
	370
	371	if (tmp->tm_isdst != 0 && tmp->tm_isdst != 1)
	372	return &nada;
	373	result = tzname[tmp->tm_isdst];
	374	return (result == NULL) ? &nada : result;
	375	}