xref: /titanic_50/usr/src/cmd/zdump/zdump.c (revision f38cb554a534c6df738be3f4d23327e69888e634)
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 
20 static 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 
90 static time_t	absolute_min_time;
91 static time_t	absolute_max_time;
92 static size_t	longest;
93 static char	*progname;
94 static int	warned;
95 
96 static char	*abbr(struct tm *);
97 static void	abbrok(const char *, const char *);
98 static long	delta(struct tm *, struct tm *);
99 static void	dumptime(const struct tm *);
100 static time_t	hunt(char *, time_t, time_t);
101 static void	setabsolutes(void);
102 static void	show(char *, time_t, int);
103 static void	usage(void);
104 static const char	*tformat(void);
105 static time_t	yeartot(long y);
106 
107 #ifndef TYPECHECK
108 #define	my_localtime	localtime
109 #else /* !defined TYPECHECK */
110 static struct tm *
111 my_localtime(tp)
112 time_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 
144 static void
145 abbrok(abbrp, zone)
146 const char * const	abbrp;
147 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 (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 
197 int
198 main(argc, argv)
199 int	argc;
200 char	*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 
363 static void
364 setabsolutes()
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 
408 static time_t
409 yeartot(y)
410 const 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 
440 static time_t
441 hunt(name, lot, hit)
442 char	*name;
443 time_t	lot;
444 time_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 
490 static long
491 delta(newp, oldp)
492 struct tm	*newp;
493 struct 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 
513 static void
514 show(zone, t, v)
515 char	*zone;
516 time_t	t;
517 int	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 
549 static char *
550 abbr(tmp)
551 struct 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 
567 static const char *
568 tformat()
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 
601 static void
602 dumptime(timeptr)
603 register 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 
656 static void
657 usage()
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