zdump.c revision bc54f855e0de1e590115101c80f152a20722cfb0
1/*
2 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
3 * Use is subject to license terms.
4 */
5
6/*
7 * Copyright (c) 2018, Joyent, Inc.
8 */
9
10/*
11 * zdump 7.24
12 * Taken from elsie.nci.nih.gov to replace the existing Solaris zdump,
13 * which was based on an earlier version of the elsie code.
14 *
15 * For zdump 7.24, the following changes were made to the elsie code:
16 *   locale/textdomain/messages to match existing Solaris style.
17 *   Solaris verbose mode is documented to display the current time first.
18 *   cstyle cleaned code.
19 *   removed old locale/textdomain code.
20 */
21
22static char	elsieid[] = "@(#)zdump.c	7.74";
23
24/*
25 * This code has been made independent of the rest of the time
26 * conversion package to increase confidence in the verification it provides.
27 * You can use this code to help in verifying other implementations.
28 */
29
30#include "stdio.h"	/* for stdout, stderr, perror */
31#include "string.h"	/* for strcpy */
32#include "sys/types.h"	/* for time_t */
33#include "time.h"	/* for struct tm */
34#include "stdlib.h"	/* for exit, malloc, atoi */
35#include "locale.h"	/* for setlocale, textdomain */
36#include "libintl.h"
37#include <ctype.h>
38#include "tzfile.h"	/* for defines */
39#include <limits.h>
40
41#ifndef ZDUMP_LO_YEAR
42#define	ZDUMP_LO_YEAR	(-500)
43#endif /* !defined ZDUMP_LO_YEAR */
44
45#ifndef ZDUMP_HI_YEAR
46#define	ZDUMP_HI_YEAR	2500
47#endif /* !defined ZDUMP_HI_YEAR */
48
49#ifndef MAX_STRING_LENGTH
50#define	MAX_STRING_LENGTH	1024
51#endif /* !defined MAX_STRING_LENGTH */
52
53#ifndef TRUE
54#define	TRUE		1
55#endif /* !defined TRUE */
56
57#ifndef FALSE
58#define	FALSE		0
59#endif /* !defined FALSE */
60
61#ifndef isleap_sum
62/*
63 * See tzfile.h for details on isleap_sum.
64 */
65#define	isleap_sum(a, b)	isleap((a) % 400 + (b) % 400)
66#endif /* !defined isleap_sum */
67
68#ifndef SECSPERDAY
69#define	SECSPERDAY	((long)SECSPERHOUR * HOURSPERDAY)
70#endif
71#define	SECSPERNYEAR	(SECSPERDAY * DAYSPERNYEAR)
72#define	SECSPERLYEAR	(SECSPERNYEAR + SECSPERDAY)
73
74#ifndef GNUC_or_lint
75#ifdef lint
76#define	GNUC_or_lint
77#else /* !defined lint */
78#ifdef __GNUC__
79#define	GNUC_or_lint
80#endif /* defined __GNUC__ */
81#endif /* !defined lint */
82#endif /* !defined GNUC_or_lint */
83
84#ifndef INITIALIZE
85#ifdef	GNUC_or_lint
86#define	INITIALIZE(x)	((x) = 0)
87#else /* !defined GNUC_or_lint */
88#define	INITIALIZE(x)
89#endif /* !defined GNUC_or_lint */
90#endif /* !defined INITIALIZE */
91
92static time_t	absolute_min_time;
93static time_t	absolute_max_time;
94static size_t	longest;
95static char	*progname;
96static int	warned;
97
98static char	*abbr(struct tm *);
99static void	abbrok(const char *, const char *);
100static long	delta(struct tm *, struct tm *);
101static void	dumptime(const struct tm *);
102static time_t	hunt(char *, time_t, time_t);
103static void	setabsolutes(void);
104static void	show(char *, time_t, int);
105static void	usage(void);
106static const char	*tformat(void);
107static time_t	yeartot(long y);
108
109#ifndef TYPECHECK
110#define	my_localtime	localtime
111#else /* !defined TYPECHECK */
112static struct tm *
113my_localtime(tp)
114time_t *tp;
115{
116	register struct tm *tmp;
117
118	tmp = localtime(tp);
119	if (tp != NULL && tmp != NULL) {
120		struct tm	tm;
121		register time_t	t;
122
123		tm = *tmp;
124		t = mktime(&tm);
125		if (t - *tp >= 1 || *tp - t >= 1) {
126			(void) fflush(stdout);
127			(void) fprintf(stderr, "\n%s: ", progname);
128			(void) fprintf(stderr, tformat(), *tp);
129			(void) fprintf(stderr, " ->");
130			(void) fprintf(stderr, " year=%d", tmp->tm_year);
131			(void) fprintf(stderr, " mon=%d", tmp->tm_mon);
132			(void) fprintf(stderr, " mday=%d", tmp->tm_mday);
133			(void) fprintf(stderr, " hour=%d", tmp->tm_hour);
134			(void) fprintf(stderr, " min=%d", tmp->tm_min);
135			(void) fprintf(stderr, " sec=%d", tmp->tm_sec);
136			(void) fprintf(stderr, " isdst=%d", tmp->tm_isdst);
137			(void) fprintf(stderr, " -> ");
138			(void) fprintf(stderr, tformat(), t);
139			(void) fprintf(stderr, "\n");
140		}
141	}
142	return (tmp);
143}
144#endif /* !defined TYPECHECK */
145
146static void
147abbrok(const char * const abbrp, 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 (isalpha(*cp) || isdigit(*cp) || *cp == '-' || *cp == '+')
156		++cp;
157	(void) fflush(stdout);
158	if (cp - abbrp < 3) {
159		(void) fprintf(stderr, gettext("%s: warning: zone \"%s\" "
160		    "abbreviation \"%s\" has fewer than 3 alphabetics\n"),
161		    progname, zone, abbrp);
162		error = 1;
163	} else if (cp - abbrp > 6) {
164		(void) fprintf(stderr, gettext("%s: warning: zone \"%s\" "
165		    "abbreviation \"%s\" has more than 6 characters\n"),
166		    progname, zone, abbrp);
167		error = 1;
168	} else if (*cp != '\0') {
169		(void) fprintf(stderr, gettext("%s: warning: zone \"%s\" "
170		    "abbreviation \"%s\" has characters other than "
171		    "alphanumerics\n"), progname, zone, abbrp);
172		error = 1;
173	}
174	if (error)
175		warned = TRUE;
176}
177
178int
179main(argc, argv)
180int	argc;
181char	*argv[];
182{
183	register int		i;
184	register int		c;
185	register int		vflag;
186	register char		*cutarg;
187	register long		cutloyear = ZDUMP_LO_YEAR;
188	register long		cuthiyear = ZDUMP_HI_YEAR;
189	register time_t		cutlotime;
190	register time_t		cuthitime;
191	time_t			now;
192	time_t			t;
193	time_t			newt;
194	struct tm		tm;
195	struct tm		newtm;
196	register struct tm	*tmp;
197	register struct tm	*newtmp;
198
199	INITIALIZE(cutlotime);
200	INITIALIZE(cuthitime);
201
202	(void) setlocale(LC_ALL, "");
203#if !defined(TEXT_DOMAIN)		/* Should be defined by cc -D */
204#define	TEXT_DOMAIN	"SYS_TEST"	/* Use this only if it weren't */
205#endif
206	(void) textdomain(TEXT_DOMAIN);
207
208	progname = argv[0];
209	for (i = 1; i < argc; ++i)
210		if (strcmp(argv[i], "--version") == 0) {
211			(void) printf("%s\n", elsieid);
212			exit(EXIT_SUCCESS);
213		}
214	vflag = 0;
215	cutarg = NULL;
216	while ((c = getopt(argc, argv, "c:v")) == 'c' || c == 'v')
217		if (c == 'v')
218			vflag = 1;
219		else	cutarg = optarg;
220	if (c != EOF ||
221		(optind == argc - 1 && strcmp(argv[optind], "=") == 0)) {
222			usage();
223			/* NOTREACHED */
224	}
225	if (vflag) {
226		if (cutarg != NULL) {
227			long	lo;
228			long	hi;
229			char	dummy;
230
231			if (sscanf(cutarg, "%ld%c", &hi, &dummy) == 1) {
232				cuthiyear = hi;
233			} else if (sscanf(cutarg, "%ld,%ld%c",
234				&lo, &hi, &dummy) == 2) {
235					cutloyear = lo;
236					cuthiyear = hi;
237			} else {
238				(void) fprintf(stderr,
239				    gettext("%s: wild -c argument %s\n"),
240				    progname, cutarg);
241				exit(EXIT_FAILURE);
242			}
243		}
244		setabsolutes();
245		cutlotime = yeartot(cutloyear);
246		cuthitime = yeartot(cuthiyear);
247	}
248	(void) time(&now);
249	longest = 0;
250	for (i = optind; i < argc; ++i)
251		if (strlen(argv[i]) > longest)
252			longest = strlen(argv[i]);
253
254	for (i = optind; i < argc; ++i) {
255		static char	buf[MAX_STRING_LENGTH];
256		static char	*tzp = NULL;
257
258		(void) unsetenv("TZ");
259		if (tzp != NULL)
260			free(tzp);
261		if ((tzp = malloc(3 + strlen(argv[i]) + 1)) == NULL) {
262			perror(progname);
263			exit(EXIT_FAILURE);
264		}
265		(void) strcpy(tzp, "TZ=");
266		(void) strcat(tzp, argv[i]);
267		if (putenv(tzp) != 0) {
268			perror(progname);
269			exit(EXIT_FAILURE);
270		}
271		if (!vflag) {
272			show(argv[i], now, FALSE);
273			continue;
274		}
275
276#if defined(sun)
277		/*
278		 * We show the current time first, probably because we froze
279		 * the behavior of zdump some time ago and then it got
280		 * changed.
281		 */
282		show(argv[i], now, TRUE);
283#endif
284		warned = FALSE;
285		t = absolute_min_time;
286		show(argv[i], t, TRUE);
287		t += SECSPERHOUR * HOURSPERDAY;
288		show(argv[i], t, TRUE);
289		if (t < cutlotime)
290			t = cutlotime;
291		tmp = my_localtime(&t);
292		if (tmp != NULL) {
293			tm = *tmp;
294			(void) strncpy(buf, abbr(&tm), sizeof (buf) - 1);
295		}
296		for (;;) {
297			if (t >= cuthitime)
298				break;
299			/* check if newt will overrun maximum time_t value */
300			if (t > LONG_MAX - (SECSPERHOUR * 12))
301				break;
302			newt = t + SECSPERHOUR * 12;
303			if (newt >= cuthitime)
304				break;
305			newtmp = localtime(&newt);
306			if (newtmp != NULL)
307				newtm = *newtmp;
308			if ((tmp == NULL || newtmp == NULL) ? (tmp != newtmp) :
309				(delta(&newtm, &tm) != (newt - t) ||
310				newtm.tm_isdst != tm.tm_isdst ||
311				strcmp(abbr(&newtm), buf) != 0)) {
312					newt = hunt(argv[i], t, newt);
313					newtmp = localtime(&newt);
314					if (newtmp != NULL) {
315						newtm = *newtmp;
316						(void) strncpy(buf,
317							abbr(&newtm),
318							sizeof (buf) - 1);
319					}
320			}
321			t = newt;
322			tm = newtm;
323			tmp = newtmp;
324		}
325		t = absolute_max_time;
326#if defined(sun)
327		show(argv[i], t, TRUE);
328		t -= SECSPERHOUR * HOURSPERDAY;
329		show(argv[i], t, TRUE);
330#else /* !defined(sun) */
331		t -= SECSPERHOUR * HOURSPERDAY;
332		show(argv[i], t, TRUE);
333		t += SECSPERHOUR * HOURSPERDAY;
334		show(argv[i], t, TRUE);
335#endif /* !defined(sun) */
336	}
337	if (fflush(stdout) || ferror(stdout)) {
338		(void) fprintf(stderr, "%s: ", progname);
339		(void) perror(gettext("Error writing standard output"));
340		exit(EXIT_FAILURE);
341	}
342	return (EXIT_SUCCESS);
343}
344
345static void
346setabsolutes()
347{
348#if defined(sun)
349	absolute_min_time = LONG_MIN;
350	absolute_max_time = LONG_MAX;
351#else
352	if (0.5 == (time_t)0.5) {
353		/*
354		 * time_t is floating.
355		 */
356		if (sizeof (time_t) == sizeof (float)) {
357			absolute_min_time = (time_t)-FLT_MAX;
358			absolute_max_time = (time_t)FLT_MAX;
359		} else if (sizeof (time_t) == sizeof (double)) {
360			absolute_min_time = (time_t)-DBL_MAX;
361			absolute_max_time = (time_t)DBL_MAX;
362		} else {
363			(void) fprintf(stderr, gettext("%s: use of -v on "
364			    "system with floating time_t other than float "
365			    "or double\n"), progname);
366			exit(EXIT_FAILURE);
367		}
368	} else
369	/*CONSTANTCONDITION*/
370	if (0 > (time_t)-1) {
371		/*
372		 * time_t is signed.
373		 */
374		register time_t	hibit;
375
376		for (hibit = 1; (hibit * 2) != 0; hibit *= 2)
377			continue;
378		absolute_min_time = hibit;
379		absolute_max_time = -(hibit + 1);
380	} else {
381		/*
382		 * time_t is unsigned.
383		 */
384		absolute_min_time = 0;
385		absolute_max_time = absolute_min_time - 1;
386	}
387#endif
388}
389
390static time_t
391yeartot(y)
392const long	y;
393{
394	register long	myy;
395	register long	seconds;
396	register time_t	t;
397
398	myy = EPOCH_YEAR;
399	t = 0;
400	while (myy != y) {
401		if (myy < y) {
402			seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
403			++myy;
404			if (t > absolute_max_time - seconds) {
405				t = absolute_max_time;
406				break;
407			}
408			t += seconds;
409		} else {
410			--myy;
411			seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
412			if (t < absolute_min_time + seconds) {
413				t = absolute_min_time;
414				break;
415			}
416			t -= seconds;
417		}
418	}
419	return (t);
420}
421
422static time_t
423hunt(name, lot, hit)
424char	*name;
425time_t	lot;
426time_t	hit;
427{
428	time_t			t;
429	long			diff;
430	struct tm		lotm;
431	register struct tm	*lotmp;
432	struct tm		tm;
433	register struct tm	*tmp;
434	char			loab[MAX_STRING_LENGTH];
435
436	lotmp = my_localtime(&lot);
437	if (lotmp != NULL) {
438		lotm = *lotmp;
439		(void) strncpy(loab, abbr(&lotm), sizeof (loab) - 1);
440	}
441	for (;;) {
442		diff = (long)(hit - lot);
443		if (diff < 2)
444			break;
445		t = lot;
446		t += diff / 2;
447		if (t <= lot)
448			++t;
449		else if (t >= hit)
450			--t;
451		tmp = my_localtime(&t);
452		if (tmp != NULL)
453			tm = *tmp;
454		if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) :
455			(delta(&tm, &lotm) == (t - lot) &&
456			tm.tm_isdst == lotm.tm_isdst &&
457			strcmp(abbr(&tm), loab) == 0)) {
458				lot = t;
459				lotm = tm;
460				lotmp = tmp;
461		} else	hit = t;
462	}
463	show(name, lot, TRUE);
464	show(name, hit, TRUE);
465	return (hit);
466}
467
468/*
469 * Thanks to Paul Eggert for logic used in delta.
470 */
471
472static long
473delta(newp, oldp)
474struct tm	*newp;
475struct tm	*oldp;
476{
477	register long	result;
478	register int	tmy;
479
480	if (newp->tm_year < oldp->tm_year)
481		return (-delta(oldp, newp));
482	result = 0;
483	for (tmy = oldp->tm_year; tmy < newp->tm_year; ++tmy)
484		result += DAYSPERNYEAR + isleap_sum(tmy, TM_YEAR_BASE);
485	result += newp->tm_yday - oldp->tm_yday;
486	result *= HOURSPERDAY;
487	result += newp->tm_hour - oldp->tm_hour;
488	result *= MINSPERHOUR;
489	result += newp->tm_min - oldp->tm_min;
490	result *= SECSPERMIN;
491	result += newp->tm_sec - oldp->tm_sec;
492	return (result);
493}
494
495static void
496show(zone, t, v)
497char	*zone;
498time_t	t;
499int	v;
500{
501	register struct tm	*tmp;
502
503	(void) printf("%-*s  ", (int)longest, zone);
504	if (v) {
505		tmp = gmtime(&t);
506		if (tmp == NULL) {
507			(void) printf(tformat(), t);
508		} else {
509			dumptime(tmp);
510			(void) printf(" UTC");
511		}
512		(void) printf(" = ");
513	}
514	tmp = my_localtime(&t);
515	dumptime(tmp);
516	if (tmp != NULL) {
517		if (*abbr(tmp) != '\0')
518			(void) printf(" %s", abbr(tmp));
519		if (v) {
520			(void) printf(" isdst=%d", tmp->tm_isdst);
521#ifdef TM_GMTOFF
522			(void) printf(" gmtoff=%ld", tmp->TM_GMTOFF);
523#endif /* defined TM_GMTOFF */
524		}
525	}
526	(void) printf("\n");
527	if (tmp != NULL && *abbr(tmp) != '\0')
528		abbrok(abbr(tmp), zone);
529}
530
531static char *
532abbr(tmp)
533struct tm	*tmp;
534{
535	register char	*result;
536	static char	nada;
537
538	if (tmp->tm_isdst != 0 && tmp->tm_isdst != 1)
539		return (&nada);
540	result = tzname[tmp->tm_isdst];
541	return ((result == NULL) ? &nada : result);
542}
543
544/*
545 * The code below can fail on certain theoretical systems;
546 * it works on all known real-world systems as of 2004-12-30.
547 */
548
549static const char *
550tformat()
551{
552#if defined(sun)
553	/* time_t is signed long */
554	return ("%ld");
555#else
556	/*CONSTANTCONDITION*/
557	if (0.5 == (time_t)0.5) {	/* floating */
558		/*CONSTANTCONDITION*/
559		if (sizeof (time_t) > sizeof (double))
560			return ("%Lg");
561		return ("%g");
562	}
563	/*CONSTANTCONDITION*/
564	if (0 > (time_t)-1) {		/* signed */
565		/*CONSTANTCONDITION*/
566		if (sizeof (time_t) > sizeof (long))
567			return ("%lld");
568		/*CONSTANTCONDITION*/
569		if (sizeof (time_t) > sizeof (int))
570			return ("%ld");
571		return ("%d");
572	}
573	/*CONSTANTCONDITION*/
574	if (sizeof (time_t) > sizeof (unsigned long))
575		return ("%llu");
576	/*CONSTANTCONDITION*/
577	if (sizeof (time_t) > sizeof (unsigned int))
578		return ("%lu");
579	return ("%u");
580#endif
581}
582
583static void
584dumptime(timeptr)
585register const struct tm	*timeptr;
586{
587	static const char	wday_name[][3] = {
588		"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
589	};
590	static const char	mon_name[][3] = {
591		"Jan", "Feb", "Mar", "Apr", "May", "Jun",
592		"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
593	};
594	register const char	*wn;
595	register const char	*mn;
596	register int		lead;
597	register int		trail;
598
599	if (timeptr == NULL) {
600		(void) printf("NULL");
601		return;
602	}
603	/*
604	 * The packaged versions of localtime and gmtime never put out-of-range
605	 * values in tm_wday or tm_mon, but since this code might be compiled
606	 * with other (perhaps experimental) versions, paranoia is in order.
607	 */
608	if (timeptr->tm_wday < 0 || timeptr->tm_wday >=
609		(int)(sizeof (wday_name) / sizeof (wday_name[0])))
610			wn = "???";
611	else		wn = wday_name[timeptr->tm_wday];
612	if (timeptr->tm_mon < 0 || timeptr->tm_mon >=
613		(int)(sizeof (mon_name) / sizeof (mon_name[0])))
614			mn = "???";
615	else		mn = mon_name[timeptr->tm_mon];
616	(void) printf("%.3s %.3s%3d %.2d:%.2d:%.2d ",
617		wn, mn,
618		timeptr->tm_mday, timeptr->tm_hour,
619		timeptr->tm_min, timeptr->tm_sec);
620#define	DIVISOR	10
621	trail = timeptr->tm_year % DIVISOR + TM_YEAR_BASE % DIVISOR;
622	lead = timeptr->tm_year / DIVISOR + TM_YEAR_BASE / DIVISOR +
623		trail / DIVISOR;
624	trail %= DIVISOR;
625	if (trail < 0 && lead > 0) {
626		trail += DIVISOR;
627		--lead;
628	} else if (lead < 0 && trail > 0) {
629		trail -= DIVISOR;
630		++lead;
631	}
632	if (lead == 0)
633		(void) printf("%d", trail);
634	else
635		(void) printf("%d%d", lead, ((trail < 0) ? -trail : trail));
636}
637
638static void
639usage()
640{
641	(void) fprintf(stderr, gettext(
642	    "%s: [ --version ] [ -v ] [ -c [loyear,]hiyear ] zonename ...\n"),
643		progname);
644	exit(EXIT_FAILURE);
645	/* NOTREACHED */
646}
647