zdump.c revision 292f4c1c373bd6e2c3c0b6e199a87392f265291f
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
20static 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
90static time_t	absolute_min_time;
91static time_t	absolute_max_time;
92static size_t	longest;
93static char	*progname;
94static int	warned;
95
96static char	*abbr(struct tm *);
97static void	abbrok(const char *, const char *);
98static long	delta(struct tm *, struct tm *);
99static void	dumptime(const struct tm *);
100static time_t	hunt(char *, time_t, time_t);
101static void	setabsolutes(void);
102static void	show(char *, time_t, int);
103static void	usage(void);
104static const char	*tformat(void);
105static time_t	yeartot(long y);
106
107#ifndef TYPECHECK
108#define	my_localtime	localtime
109#else /* !defined TYPECHECK */
110static struct tm *
111my_localtime(tp)
112time_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
144static void
145abbrok(abbrp, zone)
146const char * const	abbrp;
147const 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
197int
198main(argc, argv)
199int	argc;
200char	*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			/* check if newt will overrun maximum time_t value */
318			if (t > LONG_MAX - (SECSPERHOUR * 12))
319				break;
320			newt = t + SECSPERHOUR * 12;
321			if (newt >= cuthitime)
322				break;
323			newtmp = localtime(&newt);
324			if (newtmp != NULL)
325				newtm = *newtmp;
326			if ((tmp == NULL || newtmp == NULL) ? (tmp != newtmp) :
327				(delta(&newtm, &tm) != (newt - t) ||
328				newtm.tm_isdst != tm.tm_isdst ||
329				strcmp(abbr(&newtm), buf) != 0)) {
330					newt = hunt(argv[i], t, newt);
331					newtmp = localtime(&newt);
332					if (newtmp != NULL) {
333						newtm = *newtmp;
334						(void) strncpy(buf,
335							abbr(&newtm),
336							sizeof (buf) - 1);
337					}
338			}
339			t = newt;
340			tm = newtm;
341			tmp = newtmp;
342		}
343		t = absolute_max_time;
344#if defined(sun)
345		show(argv[i], t, TRUE);
346		t -= SECSPERHOUR * HOURSPERDAY;
347		show(argv[i], t, TRUE);
348#else /* !defined(sun) */
349		t -= SECSPERHOUR * HOURSPERDAY;
350		show(argv[i], t, TRUE);
351		t += SECSPERHOUR * HOURSPERDAY;
352		show(argv[i], t, TRUE);
353#endif /* !defined(sun) */
354	}
355	if (fflush(stdout) || ferror(stdout)) {
356		(void) fprintf(stderr, "%s: ", progname);
357		(void) perror(gettext("Error writing standard output"));
358		exit(EXIT_FAILURE);
359	}
360	return (EXIT_SUCCESS);
361}
362
363static void
364setabsolutes()
365{
366#if defined(sun)
367	absolute_min_time = LONG_MIN;
368	absolute_max_time = LONG_MAX;
369#else
370	if (0.5 == (time_t)0.5) {
371		/*
372		 * time_t is floating.
373		 */
374		if (sizeof (time_t) == sizeof (float)) {
375			absolute_min_time = (time_t)-FLT_MAX;
376			absolute_max_time = (time_t)FLT_MAX;
377		} else if (sizeof (time_t) == sizeof (double)) {
378			absolute_min_time = (time_t)-DBL_MAX;
379			absolute_max_time = (time_t)DBL_MAX;
380		} else {
381			(void) fprintf(stderr, gettext("%s: use of -v on "
382			    "system with floating time_t other than float "
383			    "or double\n"), progname);
384			exit(EXIT_FAILURE);
385		}
386	} else
387	/*CONSTANTCONDITION*/
388	if (0 > (time_t)-1) {
389		/*
390		 * time_t is signed.
391		 */
392		register time_t	hibit;
393
394		for (hibit = 1; (hibit * 2) != 0; hibit *= 2)
395			continue;
396		absolute_min_time = hibit;
397		absolute_max_time = -(hibit + 1);
398	} else {
399		/*
400		 * time_t is unsigned.
401		 */
402		absolute_min_time = 0;
403		absolute_max_time = absolute_min_time - 1;
404	}
405#endif
406}
407
408static time_t
409yeartot(y)
410const long	y;
411{
412	register long	myy;
413	register long	seconds;
414	register time_t	t;
415
416	myy = EPOCH_YEAR;
417	t = 0;
418	while (myy != y) {
419		if (myy < y) {
420			seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
421			++myy;
422			if (t > absolute_max_time - seconds) {
423				t = absolute_max_time;
424				break;
425			}
426			t += seconds;
427		} else {
428			--myy;
429			seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
430			if (t < absolute_min_time + seconds) {
431				t = absolute_min_time;
432				break;
433			}
434			t -= seconds;
435		}
436	}
437	return (t);
438}
439
440static time_t
441hunt(name, lot, hit)
442char	*name;
443time_t	lot;
444time_t	hit;
445{
446	time_t			t;
447	long			diff;
448	struct tm		lotm;
449	register struct tm	*lotmp;
450	struct tm		tm;
451	register struct tm	*tmp;
452	char			loab[MAX_STRING_LENGTH];
453
454	lotmp = my_localtime(&lot);
455	if (lotmp != NULL) {
456		lotm = *lotmp;
457		(void) strncpy(loab, abbr(&lotm), sizeof (loab) - 1);
458	}
459	for (;;) {
460		diff = (long)(hit - lot);
461		if (diff < 2)
462			break;
463		t = lot;
464		t += diff / 2;
465		if (t <= lot)
466			++t;
467		else if (t >= hit)
468			--t;
469		tmp = my_localtime(&t);
470		if (tmp != NULL)
471			tm = *tmp;
472		if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) :
473			(delta(&tm, &lotm) == (t - lot) &&
474			tm.tm_isdst == lotm.tm_isdst &&
475			strcmp(abbr(&tm), loab) == 0)) {
476				lot = t;
477				lotm = tm;
478				lotmp = tmp;
479		} else	hit = t;
480	}
481	show(name, lot, TRUE);
482	show(name, hit, TRUE);
483	return (hit);
484}
485
486/*
487 * Thanks to Paul Eggert for logic used in delta.
488 */
489
490static long
491delta(newp, oldp)
492struct tm	*newp;
493struct tm	*oldp;
494{
495	register long	result;
496	register int	tmy;
497
498	if (newp->tm_year < oldp->tm_year)
499		return (-delta(oldp, newp));
500	result = 0;
501	for (tmy = oldp->tm_year; tmy < newp->tm_year; ++tmy)
502		result += DAYSPERNYEAR + isleap_sum(tmy, TM_YEAR_BASE);
503	result += newp->tm_yday - oldp->tm_yday;
504	result *= HOURSPERDAY;
505	result += newp->tm_hour - oldp->tm_hour;
506	result *= MINSPERHOUR;
507	result += newp->tm_min - oldp->tm_min;
508	result *= SECSPERMIN;
509	result += newp->tm_sec - oldp->tm_sec;
510	return (result);
511}
512
513static void
514show(zone, t, v)
515char	*zone;
516time_t	t;
517int	v;
518{
519	register struct tm	*tmp;
520
521	(void) printf("%-*s  ", (int)longest, zone);
522	if (v) {
523		tmp = gmtime(&t);
524		if (tmp == NULL) {
525			(void) printf(tformat(), t);
526		} else {
527			dumptime(tmp);
528			(void) printf(" UTC");
529		}
530		(void) printf(" = ");
531	}
532	tmp = my_localtime(&t);
533	dumptime(tmp);
534	if (tmp != NULL) {
535		if (*abbr(tmp) != '\0')
536			(void) printf(" %s", abbr(tmp));
537		if (v) {
538			(void) printf(" isdst=%d", tmp->tm_isdst);
539#ifdef TM_GMTOFF
540			(void) printf(" gmtoff=%ld", tmp->TM_GMTOFF);
541#endif /* defined TM_GMTOFF */
542		}
543	}
544	(void) printf("\n");
545	if (tmp != NULL && *abbr(tmp) != '\0')
546		abbrok(abbr(tmp), zone);
547}
548
549static char *
550abbr(tmp)
551struct tm	*tmp;
552{
553	register char	*result;
554	static char	nada;
555
556	if (tmp->tm_isdst != 0 && tmp->tm_isdst != 1)
557		return (&nada);
558	result = tzname[tmp->tm_isdst];
559	return ((result == NULL) ? &nada : result);
560}
561
562/*
563 * The code below can fail on certain theoretical systems;
564 * it works on all known real-world systems as of 2004-12-30.
565 */
566
567static const char *
568tformat()
569{
570#if defined(sun)
571	/* time_t is signed long */
572	return ("%ld");
573#else
574	/*CONSTANTCONDITION*/
575	if (0.5 == (time_t)0.5) {	/* floating */
576		/*CONSTANTCONDITION*/
577		if (sizeof (time_t) > sizeof (double))
578			return ("%Lg");
579		return ("%g");
580	}
581	/*CONSTANTCONDITION*/
582	if (0 > (time_t)-1) {		/* signed */
583		/*CONSTANTCONDITION*/
584		if (sizeof (time_t) > sizeof (long))
585			return ("%lld");
586		/*CONSTANTCONDITION*/
587		if (sizeof (time_t) > sizeof (int))
588			return ("%ld");
589		return ("%d");
590	}
591	/*CONSTANTCONDITION*/
592	if (sizeof (time_t) > sizeof (unsigned long))
593		return ("%llu");
594	/*CONSTANTCONDITION*/
595	if (sizeof (time_t) > sizeof (unsigned int))
596		return ("%lu");
597	return ("%u");
598#endif
599}
600
601static void
602dumptime(timeptr)
603register const struct tm	*timeptr;
604{
605	static const char	wday_name[][3] = {
606		"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
607	};
608	static const char	mon_name[][3] = {
609		"Jan", "Feb", "Mar", "Apr", "May", "Jun",
610		"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
611	};
612	register const char	*wn;
613	register const char	*mn;
614	register int		lead;
615	register int		trail;
616
617	if (timeptr == NULL) {
618		(void) printf("NULL");
619		return;
620	}
621	/*
622	 * The packaged versions of localtime and gmtime never put out-of-range
623	 * values in tm_wday or tm_mon, but since this code might be compiled
624	 * with other (perhaps experimental) versions, paranoia is in order.
625	 */
626	if (timeptr->tm_wday < 0 || timeptr->tm_wday >=
627		(int)(sizeof (wday_name) / sizeof (wday_name[0])))
628			wn = "???";
629	else		wn = wday_name[timeptr->tm_wday];
630	if (timeptr->tm_mon < 0 || timeptr->tm_mon >=
631		(int)(sizeof (mon_name) / sizeof (mon_name[0])))
632			mn = "???";
633	else		mn = mon_name[timeptr->tm_mon];
634	(void) printf("%.3s %.3s%3d %.2d:%.2d:%.2d ",
635		wn, mn,
636		timeptr->tm_mday, timeptr->tm_hour,
637		timeptr->tm_min, timeptr->tm_sec);
638#define	DIVISOR	10
639	trail = timeptr->tm_year % DIVISOR + TM_YEAR_BASE % DIVISOR;
640	lead = timeptr->tm_year / DIVISOR + TM_YEAR_BASE / DIVISOR +
641		trail / DIVISOR;
642	trail %= DIVISOR;
643	if (trail < 0 && lead > 0) {
644		trail += DIVISOR;
645		--lead;
646	} else if (lead < 0 && trail > 0) {
647		trail -= DIVISOR;
648		++lead;
649	}
650	if (lead == 0)
651		(void) printf("%d", trail);
652	else
653		(void) printf("%d%d", lead, ((trail < 0) ? -trail : trail));
654}
655
656static void
657usage()
658{
659	(void) fprintf(stderr, gettext(
660	    "%s: [ --version ] [ -v ] [ -c [loyear,]hiyear ] zonename ...\n"),
661		progname);
662	exit(EXIT_FAILURE);
663	/* NOTREACHED */
664}
665