[thirdparty/glibc.git] / time / zdump.c

#ifndef lint
#ifndef NOID
static char	elsieid[] = "@(#)zdump.c	7.23";
#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, perror */
#include "string.h"	/* for strcpy */
#include "sys/types.h"	/* for time_t */
#include "time.h"	/* for struct tm */
#include "stdlib.h"	/* for exit, malloc, atoi */

#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 */

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

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

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 */
	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) {
		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) {
					(void) perror(progname);
					(void) exit(EXIT_FAILURE);
		}
		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]);
		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) {
					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)) {
		(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 ( ; ; )
		continue;
}

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;
}

extern struct tm *	localtime();

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

	(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;
	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
28f540f4 RM	1	#ifndef lint
28f540f4 RM	2	#ifndef NOID
92777700	3	static char elsieid[] = "@(#)zdump.c 7.23";
28f540f4 RM	4	#endif /* !defined NOID */
	5	#endif /* !defined lint */
	6
	7	/*
	8	** This code has been made independent of the rest of the time
	9	** conversion package to increase confidence in the verification it provides.
	10	** You can use this code to help in verifying other implementations.
	11	*/
	12
6c2f0507	13	#include "stdio.h" /* for stdout, stderr, perror */
28f540f4 RM	14	#include "string.h" /* for strcpy */
	15	#include "sys/types.h" /* for time_t */
	16	#include "time.h" /* for struct tm */
6c2f0507	17	#include "stdlib.h" /* for exit, malloc, atoi */
28f540f4 RM	18
	19	#ifndef MAX_STRING_LENGTH
	20	#define MAX_STRING_LENGTH 1024
	21	#endif /* !defined MAX_STRING_LENGTH */
	22
	23	#ifndef TRUE
	24	#define TRUE 1
	25	#endif /* !defined TRUE */
	26
	27	#ifndef FALSE
	28	#define FALSE 0
	29	#endif /* !defined FALSE */
	30
	31	#ifndef EXIT_SUCCESS
	32	#define EXIT_SUCCESS 0
	33	#endif /* !defined EXIT_SUCCESS */
	34
	35	#ifndef EXIT_FAILURE
	36	#define EXIT_FAILURE 1
	37	#endif /* !defined EXIT_FAILURE */
	38
	39	#ifndef SECSPERMIN
	40	#define SECSPERMIN 60
	41	#endif /* !defined SECSPERMIN */
	42
	43	#ifndef MINSPERHOUR
	44	#define MINSPERHOUR 60
	45	#endif /* !defined MINSPERHOUR */
	46
	47	#ifndef SECSPERHOUR
	48	#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
	49	#endif /* !defined SECSPERHOUR */
	50
	51	#ifndef HOURSPERDAY
	52	#define HOURSPERDAY 24
	53	#endif /* !defined HOURSPERDAY */
	54
	55	#ifndef EPOCH_YEAR
	56	#define EPOCH_YEAR 1970
	57	#endif /* !defined EPOCH_YEAR */
	58
	59	#ifndef TM_YEAR_BASE
	60	#define TM_YEAR_BASE 1900
	61	#endif /* !defined TM_YEAR_BASE */
	62
	63	#ifndef DAYSPERNYEAR
	64	#define DAYSPERNYEAR 365
	65	#endif /* !defined DAYSPERNYEAR */
	66
	67	#ifndef isleap
	68	#define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) \|\| ((y) % 400) == 0)
	69	#endif /* !defined isleap */
	70
92777700 RM	71	#if HAVE_GETTEXT - 0
	72	#include "locale.h" /* for setlocale */
	73	#include "libintl.h"
	74	#endif /* HAVE_GETTEXT - 0 */
	75
28f540f4 RM	76	#ifndef GNUC_or_lint
	77	#ifdef lint
	78	#define GNUC_or_lint
	79	#endif /* defined lint */
6c2f0507	80	#ifndef lint
28f540f4 RM	81	#ifdef __GNUC__
	82	#define GNUC_or_lint
	83	#endif /* defined __GNUC__ */
6c2f0507	84	#endif /* !defined lint */
28f540f4 RM	85	#endif /* !defined GNUC_or_lint */
	86
	87	#ifndef INITIALIZE
	88	#ifdef GNUC_or_lint
	89	#define INITIALIZE(x) ((x) = 0)
	90	#endif /* defined GNUC_or_lint */
	91	#ifndef GNUC_or_lint
	92	#define INITIALIZE(x)
	93	#endif /* !defined GNUC_or_lint */
	94	#endif /* !defined INITIALIZE */
	95
a182affd RM	96	/*
a182affd RM	97	** For the benefit of GNU folk...
92777700 RM	98	** `_(MSGID)' uses the current locale's message library string for MSGID.
92777700 RM	99	** The default is to use gettext if available, and use MSGID otherwise.
a182affd RM	100	*/
	101
	102	#ifndef _
92777700 RM	103	#if HAVE_GETTEXT - 0
	104	#define _(msgid) gettext(msgid)
	105	#else /* !(HAVE_GETTEXT - 0) */
	106	#define _(msgid) msgid
	107	#endif /* !(HAVE_GETTEXT - 0) */
a182affd RM	108	#endif /* !defined _ */
a182affd RM	109
92777700 RM	110	#ifndef TZ_DOMAIN
	111	#define TZ_DOMAIN "tz"
	112	#endif /* !defined TZ_DOMAIN */
	113
28f540f4 RM	114	extern char ** environ;
	115	extern int getopt();
	116	extern char * optarg;
	117	extern int optind;
	118	extern time_t time();
	119	extern char * tzname[2];
	120
28f540f4 RM	121	static char * abbr();
	122	static long delta();
	123	static time_t hunt();
	124	static int longest;
	125	static char * progname;
	126	static void show();
	127
	128	int
	129	main(argc, argv)
	130	int argc;
	131	char * argv[];
	132	{
6c2f0507 RM	133	register int i;
6c2f0507 RM	134	register int c;
28f540f4 RM	135	register int vflag;
	136	register char * cutoff;
	137	register int cutyear;
	138	register long cuttime;
	139	char ** fakeenv;
	140	time_t now;
6c2f0507 RM	141	time_t t;
6c2f0507 RM	142	time_t newt;
28f540f4	143	time_t hibit;
6c2f0507 RM	144	struct tm tm;
6c2f0507 RM	145	struct tm newtm;
28f540f4 RM	146
28f540f4 RM	147	INITIALIZE(cuttime);
92777700 RM	148	#if HAVE_GETTEXT - 0
	149	(void) setlocale(LC_MESSAGES, "");
	150	#ifdef TZ_DOMAINDIR
	151	(void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR);
	152	#endif /* defined(TEXTDOMAINDIR) */
	153	(void) textdomain(TZ_DOMAIN);
	154	#endif /* HAVE_GETTEXT - 0 */
28f540f4 RM	155	progname = argv[0];
	156	vflag = 0;
	157	cutoff = NULL;
	158	while ((c = getopt(argc, argv, "c:v")) == 'c' \|\| c == 'v')
	159	if (c == 'v')
	160	vflag = 1;
	161	else cutoff = optarg;
	162	if (c != EOF \|\|
	163	(optind == argc - 1 && strcmp(argv[optind], "=") == 0)) {
	164	(void) fprintf(stderr,
cbd3dceb	165	_("%s: usage is %s [ -v ] [ -c cutoff ] zonename ...\n"),
28f540f4 RM	166	argv[0], argv[0]);
	167	(void) exit(EXIT_FAILURE);
	168	}
	169	if (cutoff != NULL) {
	170	int y;
	171
	172	cutyear = atoi(cutoff);
	173	cuttime = 0;
	174	for (y = EPOCH_YEAR; y < cutyear; ++y)
	175	cuttime += DAYSPERNYEAR + isleap(y);
	176	cuttime = SECSPERHOUR HOURSPERDAY;
	177	}
	178	(void) time(&now);
	179	longest = 0;
	180	for (i = optind; i < argc; ++i)
	181	if (strlen(argv[i]) > longest)
	182	longest = strlen(argv[i]);
	183	for (hibit = 1; (hibit << 1) != 0; hibit <<= 1)
	184	continue;
	185	{
6c2f0507 RM	186	register int from;
6c2f0507 RM	187	register int to;
28f540f4 RM	188
	189	for (i = 0; environ[i] != NULL; ++i)
	190	continue;
6c2f0507 RM	191	fakeenv = (char *) malloc((size_t) ((i + 2)
6c2f0507 RM	192	sizeof *fakeenv));
28f540f4	193	if (fakeenv == NULL \|\|
6c2f0507 RM	194	(fakeenv[0] = (char *) malloc((size_t) (longest +
	195	4))) == NULL) {
	196	(void) perror(progname);
	197	(void) exit(EXIT_FAILURE);
28f540f4 RM	198	}
	199	to = 0;
	200	(void) strcpy(fakeenv[to++], "TZ=");
	201	for (from = 0; environ[from] != NULL; ++from)
	202	if (strncmp(environ[from], "TZ=", 3) != 0)
	203	fakeenv[to++] = environ[from];
	204	fakeenv[to] = NULL;
	205	environ = fakeenv;
	206	}
	207	for (i = optind; i < argc; ++i) {
	208	static char buf[MAX_STRING_LENGTH];
	209
	210	(void) strcpy(&fakeenv[0][3], argv[i]);
	211	show(argv[i], now, FALSE);
	212	if (!vflag)
	213	continue;
	214	/*
	215	** Get lowest value of t.
	216	*/
	217	t = hibit;
	218	if (t > 0) /* time_t is unsigned */
	219	t = 0;
	220	show(argv[i], t, TRUE);
	221	t += SECSPERHOUR * HOURSPERDAY;
	222	show(argv[i], t, TRUE);
	223	tm = *localtime(&t);
	224	(void) strncpy(buf, abbr(&tm), (sizeof buf) - 1);
	225	for ( ; ; ) {
	226	if (cutoff != NULL && t >= cuttime)
	227	break;
	228	newt = t + SECSPERHOUR * 12;
	229	if (cutoff != NULL && newt >= cuttime)
	230	break;
	231	if (newt <= t)
	232	break;
	233	newtm = *localtime(&newt);
	234	if (delta(&newtm, &tm) != (newt - t) \|\|
	235	newtm.tm_isdst != tm.tm_isdst \|\|
	236	strcmp(abbr(&newtm), buf) != 0) {
	237	newt = hunt(argv[i], t, newt);
	238	newtm = *localtime(&newt);
	239	(void) strncpy(buf, abbr(&newtm),
	240	(sizeof buf) - 1);
	241	}
	242	t = newt;
	243	tm = newtm;
	244	}
	245	/*
	246	** Get highest value of t.
	247	*/
	248	t = ~((time_t) 0);
	249	if (t < 0) /* time_t is signed */
	250	t &= ~hibit;
	251	t -= SECSPERHOUR * HOURSPERDAY;
	252	show(argv[i], t, TRUE);
	253	t += SECSPERHOUR * HOURSPERDAY;
	254	show(argv[i], t, TRUE);
	255	}
	256	if (fflush(stdout) \|\| ferror(stdout)) {
cbd3dceb	257	(void) fprintf(stderr, _("%s: Error writing standard output "),
28f540f4	258	argv[0]);
cbd3dceb	259	(void) perror(_("standard output"));
28f540f4 RM	260	(void) exit(EXIT_FAILURE);
	261	}
	262	exit(EXIT_SUCCESS);
	263
	264	/* gcc -Wall pacifier */
	265	for ( ; ; )
	266	continue;
	267	}
	268
	269	static time_t
	270	hunt(name, lot, hit)
	271	char * name;
	272	time_t lot;
	273	time_t hit;
	274	{
	275	time_t t;
	276	struct tm lotm;
	277	struct tm tm;
	278	static char loab[MAX_STRING_LENGTH];
	279
	280	lotm = *localtime(&lot);
	281	(void) strncpy(loab, abbr(&lotm), (sizeof loab) - 1);
	282	while ((hit - lot) >= 2) {
	283	t = lot / 2 + hit / 2;
	284	if (t <= lot)
	285	++t;
	286	else if (t >= hit)
	287	--t;
	288	tm = *localtime(&t);
	289	if (delta(&tm, &lotm) == (t - lot) &&
	290	tm.tm_isdst == lotm.tm_isdst &&
	291	strcmp(abbr(&tm), loab) == 0) {
	292	lot = t;
	293	lotm = tm;
	294	} else hit = t;
	295	}
	296	show(name, lot, TRUE);
	297	show(name, hit, TRUE);
	298	return hit;
	299	}
	300
	301	/*
	302	** Thanks to Paul Eggert (eggert@twinsun.com) for logic used in delta.
	303	*/
	304
	305	static long
	306	delta(newp, oldp)
	307	struct tm * newp;
	308	struct tm * oldp;
	309	{
	310	long result;
	311	int tmy;
	312
	313	if (newp->tm_year < oldp->tm_year)
	314	return -delta(oldp, newp);
	315	result = 0;
	316	for (tmy = oldp->tm_year; tmy < newp->tm_year; ++tmy)
	317	result += DAYSPERNYEAR + isleap(tmy + TM_YEAR_BASE);
	318	result += newp->tm_yday - oldp->tm_yday;
	319	result *= HOURSPERDAY;
	320	result += newp->tm_hour - oldp->tm_hour;
	321	result *= MINSPERHOUR;
	322	result += newp->tm_min - oldp->tm_min;
	323	result *= SECSPERMIN;
324	result += newp->tm_sec - oldp->tm_sec;
325	return result;
326	}
327
328	extern struct tm * localtime();
329
330	static void
331	show(zone, t, v)
332	char * zone;
333	time_t t;
334	int v;
335	{
336	struct tm * tmp;
337
338	(void) printf("%-*s ", longest, zone);
339	if (v)
340	(void) printf("%.24s GMT = ", asctime(gmtime(&t)));
341	tmp = localtime(&t);
342	(void) printf("%.24s", asctime(tmp));
343	if (*abbr(tmp) != '\0')
344	(void) printf(" %s", abbr(tmp));
345	if (v) {
346	(void) printf(" isdst=%d", tmp->tm_isdst);
347	#ifdef TM_GMTOFF
348	(void) printf(" gmtoff=%ld", tmp->TM_GMTOFF);
349	#endif /* defined TM_GMTOFF */
350	}
351	(void) printf("\n");
352	}
353
354	static char *
355	abbr(tmp)
356	struct tm * tmp;
357	{
358	register char * result;
359	static char nada;
360
361	if (tmp->tm_isdst != 0 && tmp->tm_isdst != 1)
362	return &nada;
363	result = tzname[tmp->tm_isdst];
364	return (result == NULL) ? &nada : result;
365	}