1static char	elsieid[] = "@(#)zdump.c	8.3";
2
3/*
4** This code has been made independent of the rest of the time
5** conversion package to increase confidence in the verification it provides.
6** You can use this code to help in verifying other implementations.
7*/
8
9#include "stdio.h"	/* for stdout, stderr, perror */
10#include "string.h"	/* for strcpy */
11#include "sys/types.h"	/* for time_t */
12#include "time.h"	/* for struct tm */
13#include "stdlib.h"	/* for exit, malloc, atoi */
14#include "float.h"	/* for FLT_MAX and DBL_MAX */
15#include "ctype.h"	/* for isalpha et al. */
16#ifndef isascii
17#define isascii(x) 1
18#endif /* !defined isascii */
19
20#ifndef ZDUMP_LO_YEAR
21#define ZDUMP_LO_YEAR	(-500)
22#endif /* !defined ZDUMP_LO_YEAR */
23
24#ifndef ZDUMP_HI_YEAR
25#define ZDUMP_HI_YEAR	2500
26#endif /* !defined ZDUMP_HI_YEAR */
27
28#ifndef MAX_STRING_LENGTH
29#define MAX_STRING_LENGTH	1024
30#endif /* !defined MAX_STRING_LENGTH */
31
32#ifndef TRUE
33#define TRUE		1
34#endif /* !defined TRUE */
35
36#ifndef FALSE
37#define FALSE		0
38#endif /* !defined FALSE */
39
40#ifndef EXIT_SUCCESS
41#define EXIT_SUCCESS	0
42#endif /* !defined EXIT_SUCCESS */
43
44#ifndef EXIT_FAILURE
45#define EXIT_FAILURE	1
46#endif /* !defined EXIT_FAILURE */
47
48#ifndef SECSPERMIN
49#define SECSPERMIN	60
50#endif /* !defined SECSPERMIN */
51
52#ifndef MINSPERHOUR
53#define MINSPERHOUR	60
54#endif /* !defined MINSPERHOUR */
55
56#ifndef SECSPERHOUR
57#define SECSPERHOUR	(SECSPERMIN * MINSPERHOUR)
58#endif /* !defined SECSPERHOUR */
59
60#ifndef HOURSPERDAY
61#define HOURSPERDAY	24
62#endif /* !defined HOURSPERDAY */
63
64#ifndef EPOCH_YEAR
65#define EPOCH_YEAR	1970
66#endif /* !defined EPOCH_YEAR */
67
68#ifndef TM_YEAR_BASE
69#define TM_YEAR_BASE	1900
70#endif /* !defined TM_YEAR_BASE */
71
72#ifndef DAYSPERNYEAR
73#define DAYSPERNYEAR	365
74#endif /* !defined DAYSPERNYEAR */
75
76#ifndef isleap
77#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
78#endif /* !defined isleap */
79
80#ifndef isleap_sum
81/*
82** See tzfile.h for details on isleap_sum.
83*/
84#define isleap_sum(a, b)	isleap((a) % 400 + (b) % 400)
85#endif /* !defined isleap_sum */
86
87#define SECSPERDAY	((long) SECSPERHOUR * HOURSPERDAY)
88#define SECSPERNYEAR	(SECSPERDAY * DAYSPERNYEAR)
89#define SECSPERLYEAR	(SECSPERNYEAR + SECSPERDAY)
90
91#if HAVE_GETTEXT
92#include "locale.h"	/* for setlocale */
93#include "libintl.h"
94#endif /* HAVE_GETTEXT */
95
96#ifndef GNUC_or_lint
97#ifdef lint
98#define GNUC_or_lint
99#else /* !defined lint */
100#ifdef __GNUC__
101#define GNUC_or_lint
102#endif /* defined __GNUC__ */
103#endif /* !defined lint */
104#endif /* !defined GNUC_or_lint */
105
106#ifndef INITIALIZE
107#ifdef GNUC_or_lint
108#define INITIALIZE(x)	((x) = 0)
109#else /* !defined GNUC_or_lint */
110#define INITIALIZE(x)
111#endif /* !defined GNUC_or_lint */
112#endif /* !defined INITIALIZE */
113
114/*
115** For the benefit of GNU folk...
116** `_(MSGID)' uses the current locale's message library string for MSGID.
117** The default is to use gettext if available, and use MSGID otherwise.
118*/
119
120#ifndef _
121#if HAVE_GETTEXT
122#define _(msgid) gettext(msgid)
123#else /* !HAVE_GETTEXT */
124#define _(msgid) msgid
125#endif /* !HAVE_GETTEXT */
126#endif /* !defined _ */
127
128#ifndef TZ_DOMAIN
129#define TZ_DOMAIN "tz"
130#endif /* !defined TZ_DOMAIN */
131
132#ifndef P
133#define P(x)	x
134#endif /* !defined P */
135
136extern char **	environ;
137extern int	getopt P((int argc, char * const argv[],
138			const char * options));
139extern char *	optarg;
140extern int	optind;
141extern char *	tzname[2];
142
143static time_t	absolute_min_time;
144static time_t	absolute_max_time;
145static size_t	longest;
146static char *	progname;
147static int	warned;
148
149static char *	abbr P((struct tm * tmp));
150static void	abbrok P((const char * abbrp, const char * zone));
151static long	delta P((struct tm * newp, struct tm * oldp));
152static void	dumptime P((const struct tm * tmp));
153static time_t	hunt P((char * name, time_t lot, time_t	hit));
154static void	setabsolutes P((void));
155static void	show P((char * zone, time_t t, int v));
156static const char *	tformat P((void));
157static time_t	yeartot P((long y));
158
159#ifndef TYPECHECK
160#define my_localtime	localtime
161#else /* !defined TYPECHECK */
162static struct tm *
163my_localtime(tp)
164time_t *	tp;
165{
166	register struct tm *	tmp;
167
168	tmp = localtime(tp);
169	if (tp != NULL && tmp != NULL) {
170		struct tm	tm;
171		register time_t	t;
172
173		tm = *tmp;
174		t = mktime(&tm);
175		if (t - *tp >= 1 || *tp - t >= 1) {
176			(void) fflush(stdout);
177			(void) fprintf(stderr, "\n%s: ", progname);
178			(void) fprintf(stderr, tformat(), *tp);
179			(void) fprintf(stderr, " ->");
180			(void) fprintf(stderr, " year=%d", tmp->tm_year);
181			(void) fprintf(stderr, " mon=%d", tmp->tm_mon);
182			(void) fprintf(stderr, " mday=%d", tmp->tm_mday);
183			(void) fprintf(stderr, " hour=%d", tmp->tm_hour);
184			(void) fprintf(stderr, " min=%d", tmp->tm_min);
185			(void) fprintf(stderr, " sec=%d", tmp->tm_sec);
186			(void) fprintf(stderr, " isdst=%d", tmp->tm_isdst);
187			(void) fprintf(stderr, " -> ");
188			(void) fprintf(stderr, tformat(), t);
189			(void) fprintf(stderr, "\n");
190		}
191	}
192	return tmp;
193}
194#endif /* !defined TYPECHECK */
195
196static void
197abbrok(abbrp, zone)
198const char * const	abbrp;
199const char * const	zone;
200{
201	register const char *	cp;
202	register char *		wp;
203
204	if (warned)
205		return;
206	cp = abbrp;
207	wp = NULL;
208	while (isascii((unsigned char) *cp) && isalpha((unsigned char) *cp))
209		++cp;
210	if (cp - abbrp == 0)
211		wp = _("lacks alphabetic at start");
212	else if (cp - abbrp < 3)
213		wp = _("has fewer than 3 alphabetics");
214	else if (cp - abbrp > 6)
215		wp = _("has more than 6 alphabetics");
216	if (wp == NULL && (*cp == '+' || *cp == '-')) {
217		++cp;
218		if (isascii((unsigned char) *cp) &&
219			isdigit((unsigned char) *cp))
220				if (*cp++ == '1' && *cp >= '0' && *cp <= '4')
221					++cp;
222		if (*cp != '\0')
223			wp = _("differs from POSIX standard");
224	}
225	if (wp == NULL)
226		return;
227	(void) fflush(stdout);
228	(void) fprintf(stderr,
229		_("%s: warning: zone \"%s\" abbreviation \"%s\" %s\n"),
230		progname, zone, abbrp, wp);
231	warned = TRUE;
232}
233
234int
235main(argc, argv)
236int	argc;
237char *	argv[];
238{
239	register int		i;
240	register int		c;
241	register int		vflag;
242	register char *		cutarg;
243	register long		cutloyear = ZDUMP_LO_YEAR;
244	register long		cuthiyear = ZDUMP_HI_YEAR;
245	register time_t		cutlotime;
246	register time_t		cuthitime;
247	register char **	fakeenv;
248	time_t			now;
249	time_t			t;
250	time_t			newt;
251	struct tm		tm;
252	struct tm		newtm;
253	register struct tm *	tmp;
254	register struct tm *	newtmp;
255
256	INITIALIZE(cutlotime);
257	INITIALIZE(cuthitime);
258#if HAVE_GETTEXT
259	(void) setlocale(LC_ALL, "");
260#ifdef TZ_DOMAINDIR
261	(void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR);
262#endif /* defined TEXTDOMAINDIR */
263	(void) textdomain(TZ_DOMAIN);
264#endif /* HAVE_GETTEXT */
265	progname = argv[0];
266	for (i = 1; i < argc; ++i)
267		if (strcmp(argv[i], "--version") == 0) {
268			(void) printf("%s\n", elsieid);
269			exit(EXIT_SUCCESS);
270		}
271	vflag = 0;
272	cutarg = NULL;
273	while ((c = getopt(argc, argv, "c:v")) == 'c' || c == 'v')
274		if (c == 'v')
275			vflag = 1;
276		else	cutarg = optarg;
277	if ((c != EOF && c != -1) ||
278		(optind == argc - 1 && strcmp(argv[optind], "=") == 0)) {
279			(void) fprintf(stderr,
280_("%s: usage is %s [ --version ] [ -v ] [ -c [loyear,]hiyear ] zonename ...\n"),
281				progname, progname);
282			exit(EXIT_FAILURE);
283	}
284	if (vflag) {
285		if (cutarg != NULL) {
286			long	lo;
287			long	hi;
288			char	dummy;
289
290			if (sscanf(cutarg, "%ld%c", &hi, &dummy) == 1) {
291				cuthiyear = hi;
292			} else if (sscanf(cutarg, "%ld,%ld%c",
293				&lo, &hi, &dummy) == 2) {
294					cutloyear = lo;
295					cuthiyear = hi;
296			} else {
297(void) fprintf(stderr, _("%s: wild -c argument %s\n"),
298					progname, cutarg);
299				exit(EXIT_FAILURE);
300			}
301		}
302		setabsolutes();
303		cutlotime = yeartot(cutloyear);
304		cuthitime = yeartot(cuthiyear);
305	}
306	(void) time(&now);
307	longest = 0;
308	for (i = optind; i < argc; ++i)
309		if (strlen(argv[i]) > longest)
310			longest = strlen(argv[i]);
311	{
312		register int	from;
313		register int	to;
314
315		for (i = 0; environ[i] != NULL; ++i)
316			continue;
317		fakeenv = (char **) malloc((size_t) ((i + 2) *
318			sizeof *fakeenv));
319		if (fakeenv == NULL ||
320			(fakeenv[0] = (char *) malloc(longest + 4)) == NULL) {
321					(void) perror(progname);
322					exit(EXIT_FAILURE);
323		}
324		to = 0;
325		(void) strcpy(fakeenv[to++], "TZ=");
326		for (from = 0; environ[from] != NULL; ++from)
327			if (strncmp(environ[from], "TZ=", 3) != 0)
328				fakeenv[to++] = environ[from];
329		fakeenv[to] = NULL;
330		environ = fakeenv;
331	}
332	for (i = optind; i < argc; ++i) {
333		static char	buf[MAX_STRING_LENGTH];
334
335		(void) strcpy(&fakeenv[0][3], argv[i]);
336		if (!vflag) {
337			show(argv[i], now, FALSE);
338			continue;
339		}
340		warned = FALSE;
341		t = absolute_min_time;
342		show(argv[i], t, TRUE);
343		t += SECSPERHOUR * HOURSPERDAY;
344		show(argv[i], t, TRUE);
345		if (t < cutlotime)
346			t = cutlotime;
347		tmp = my_localtime(&t);
348		if (tmp != NULL) {
349			tm = *tmp;
350			(void) strncpy(buf, abbr(&tm), (sizeof buf) - 1);
351		}
352		for ( ; ; ) {
353			if (t >= cuthitime)
354				break;
355			newt = t + SECSPERHOUR * 12;
356			if (newt >= cuthitime)
357				break;
358			if (newt <= t)
359				break;
360			newtmp = localtime(&newt);
361			if (newtmp != NULL)
362				newtm = *newtmp;
363			if ((tmp == NULL || newtmp == NULL) ? (tmp != newtmp) :
364				(delta(&newtm, &tm) != (newt - t) ||
365				newtm.tm_isdst != tm.tm_isdst ||
366				strcmp(abbr(&newtm), buf) != 0)) {
367					newt = hunt(argv[i], t, newt);
368					newtmp = localtime(&newt);
369					if (newtmp != NULL) {
370						newtm = *newtmp;
371						(void) strncpy(buf,
372							abbr(&newtm),
373							(sizeof buf) - 1);
374					}
375			}
376			t = newt;
377			tm = newtm;
378			tmp = newtmp;
379		}
380		t = absolute_max_time;
381		t -= SECSPERHOUR * HOURSPERDAY;
382		show(argv[i], t, TRUE);
383		t += SECSPERHOUR * HOURSPERDAY;
384		show(argv[i], t, TRUE);
385	}
386	if (fflush(stdout) || ferror(stdout)) {
387		(void) fprintf(stderr, "%s: ", progname);
388		(void) perror(_("Error writing to standard output"));
389		exit(EXIT_FAILURE);
390	}
391	exit(EXIT_SUCCESS);
392	/* If exit fails to exit... */
393	return EXIT_FAILURE;
394}
395
396static void
397setabsolutes()
398{
399	if (0.5 == (time_t) 0.5) {
400		/*
401		** time_t is floating.
402		*/
403		if (sizeof (time_t) == sizeof (float)) {
404			absolute_min_time = (time_t) -FLT_MAX;
405			absolute_max_time = (time_t) FLT_MAX;
406		} else if (sizeof (time_t) == sizeof (double)) {
407			absolute_min_time = (time_t) -DBL_MAX;
408			absolute_max_time = (time_t) DBL_MAX;
409		} else {
410			(void) fprintf(stderr,
411_("%s: use of -v on system with floating time_t other than float or double\n"),
412				progname);
413			exit(EXIT_FAILURE);
414		}
415	} else if (0 > (time_t) -1) {
416		/*
417		** time_t is signed.  Assume overflow wraps around.
418		*/
419		time_t t = 0;
420		time_t t1 = 1;
421
422		while (t < t1) {
423			t = t1;
424			t1 = 2 * t1 + 1;
425		}
426
427		absolute_max_time = t;
428		t = -t;
429		absolute_min_time = t - 1;
430		if (t < absolute_min_time)
431			absolute_min_time = t;
432	} else {
433		/*
434		** time_t is unsigned.
435		*/
436		absolute_min_time = 0;
437		absolute_max_time = absolute_min_time - 1;
438	}
439}
440
441static time_t
442yeartot(y)
443const long	y;
444{
445	register long	myy;
446	register long	seconds;
447	register time_t	t;
448
449	myy = EPOCH_YEAR;
450	t = 0;
451	while (myy != y) {
452		if (myy < y) {
453			seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
454			++myy;
455			if (t > absolute_max_time - seconds) {
456				t = absolute_max_time;
457				break;
458			}
459			t += seconds;
460		} else {
461			--myy;
462			seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
463			if (t < absolute_min_time + seconds) {
464				t = absolute_min_time;
465				break;
466			}
467			t -= seconds;
468		}
469	}
470	return t;
471}
472
473static time_t
474hunt(char *name, time_t lot, time_t hit)
475{
476	time_t			t;
477	long			diff;
478	struct tm		lotm;
479	register struct tm *	lotmp;
480	struct tm		tm;
481	register struct tm *	tmp;
482	char			loab[MAX_STRING_LENGTH];
483
484	lotmp = my_localtime(&lot);
485	if (lotmp != NULL) {
486		lotm = *lotmp;
487		(void) strncpy(loab, abbr(&lotm), (sizeof loab) - 1);
488	}
489	for ( ; ; ) {
490		diff = (long) (hit - lot);
491		if (diff < 2)
492			break;
493		t = lot;
494		t += diff / 2;
495		if (t <= lot)
496			++t;
497		else if (t >= hit)
498			--t;
499		tmp = my_localtime(&t);
500		if (tmp != NULL)
501			tm = *tmp;
502		if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) :
503			(delta(&tm, &lotm) == (t - lot) &&
504			tm.tm_isdst == lotm.tm_isdst &&
505			strcmp(abbr(&tm), loab) == 0)) {
506				lot = t;
507				lotm = tm;
508				lotmp = tmp;
509		} else	hit = t;
510	}
511	show(name, lot, TRUE);
512	show(name, hit, TRUE);
513	return hit;
514}
515
516/*
517** Thanks to Paul Eggert for logic used in delta.
518*/
519
520static long
521delta(newp, oldp)
522struct tm *	newp;
523struct tm *	oldp;
524{
525	register long	result;
526	register int	tmy;
527
528	if (newp->tm_year < oldp->tm_year)
529		return -delta(oldp, newp);
530	result = 0;
531	for (tmy = oldp->tm_year; tmy < newp->tm_year; ++tmy)
532		result += DAYSPERNYEAR + isleap_sum(tmy, TM_YEAR_BASE);
533	result += newp->tm_yday - oldp->tm_yday;
534	result *= HOURSPERDAY;
535	result += newp->tm_hour - oldp->tm_hour;
536	result *= MINSPERHOUR;
537	result += newp->tm_min - oldp->tm_min;
538	result *= SECSPERMIN;
539	result += newp->tm_sec - oldp->tm_sec;
540	return result;
541}
542
543static void
544show(char *zone, time_t t, int v)
545{
546	register struct tm *	tmp;
547
548	(void) printf("%-*s  ", (int) longest, zone);
549	if (v) {
550		tmp = gmtime(&t);
551		if (tmp == NULL) {
552			(void) printf(tformat(), t);
553		} else {
554			dumptime(tmp);
555			(void) printf(" UTC");
556		}
557		(void) printf(" = ");
558	}
559	tmp = my_localtime(&t);
560	dumptime(tmp);
561	if (tmp != NULL) {
562		if (*abbr(tmp) != '\0')
563			(void) printf(" %s", abbr(tmp));
564		if (v) {
565			(void) printf(" isdst=%d", tmp->tm_isdst);
566#ifdef TM_GMTOFF
567			(void) printf(" gmtoff=%ld", tmp->TM_GMTOFF);
568#endif /* defined TM_GMTOFF */
569		}
570	}
571	(void) printf("\n");
572	if (tmp != NULL && *abbr(tmp) != '\0')
573		abbrok(abbr(tmp), zone);
574}
575
576static char *
577abbr(tmp)
578struct tm *	tmp;
579{
580	register char *	result;
581	static char	nada;
582
583	if (tmp->tm_isdst != 0 && tmp->tm_isdst != 1)
584		return &nada;
585	result = tzname[tmp->tm_isdst];
586	return (result == NULL) ? &nada : result;
587}
588
589/*
590** The code below can fail on certain theoretical systems;
591** it works on all known real-world systems as of 2004-12-30.
592*/
593
594static const char *
595tformat()
596{
597	if (0.5 == (time_t) 0.5) {	/* floating */
598		if (sizeof (time_t) > sizeof (double))
599			return "%Lg";
600		return "%g";
601	}
602	if (0 > (time_t) -1) {		/* signed */
603		if (sizeof (time_t) > sizeof (long))
604			return "%lld";
605		if (sizeof (time_t) > sizeof (int))
606			return "%ld";
607		return "%d";
608	}
609	if (sizeof (time_t) > sizeof (unsigned long))
610		return "%llu";
611	if (sizeof (time_t) > sizeof (unsigned int))
612		return "%lu";
613	return "%u";
614}
615
616static void
617dumptime(timeptr)
618register const struct tm *	timeptr;
619{
620	static const char	wday_name[][3] = {
621		"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
622	};
623	static const char	mon_name[][3] = {
624		"Jan", "Feb", "Mar", "Apr", "May", "Jun",
625		"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
626	};
627	register const char *	wn;
628	register const char *	mn;
629	register int		lead;
630	register int		trail;
631
632	if (timeptr == NULL) {
633		(void) printf("NULL");
634		return;
635	}
636	/*
637	** The packaged versions of localtime and gmtime never put out-of-range
638	** values in tm_wday or tm_mon, but since this code might be compiled
639	** with other (perhaps experimental) versions, paranoia is in order.
640	*/
641	if (timeptr->tm_wday < 0 || timeptr->tm_wday >=
642		(int) (sizeof wday_name / sizeof wday_name[0]))
643			wn = "???";
644	else		wn = wday_name[timeptr->tm_wday];
645	if (timeptr->tm_mon < 0 || timeptr->tm_mon >=
646		(int) (sizeof mon_name / sizeof mon_name[0]))
647			mn = "???";
648	else		mn = mon_name[timeptr->tm_mon];
649	(void) printf("%.3s %.3s%3d %.2d:%.2d:%.2d ",
650		wn, mn,
651		timeptr->tm_mday, timeptr->tm_hour,
652		timeptr->tm_min, timeptr->tm_sec);
653#define DIVISOR	10
654	trail = timeptr->tm_year % DIVISOR + TM_YEAR_BASE % DIVISOR;
655	lead = timeptr->tm_year / DIVISOR + TM_YEAR_BASE / DIVISOR +
656		trail / DIVISOR;
657	trail %= DIVISOR;
658	if (trail < 0 && lead > 0) {
659		trail += DIVISOR;
660		--lead;
661	} else if (lead < 0 && trail > 0) {
662		trail -= DIVISOR;
663		++lead;
664	}
665	if (lead == 0)
666		(void) printf("%d", trail);
667	else	(void) printf("%d%d", lead, ((trail < 0) ? -trail : trail));
668}
669