xref: /titanic_41/usr/src/cmd/zdump/zdump.c (revision 31ceb98b622e1a310256f4c4a1472beb92046db3)
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