1 /*-
2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Arthur David Olson of the National Cancer Institute.
7 *
8 * %sccs.include.redist.c%
9 */
10
11 #ifndef lint
12 static char sccsid[] = "@(#)zic.c 8.1 (Berkeley) 07/19/93";
13 #endif /* not lint */
14
15 #ifdef notdef
16 static char elsieid[] = "@(#)zic.c 4.12";
17 #endif
18
19 #include <sys/types.h>
20 #include <sys/cdefs.h>
21 #include <sys/stat.h>
22 #include <time.h>
23 #include <tzfile.h>
24 #include <stdio.h>
25 #include <ctype.h>
26 #include <string.h>
27 #include <stdlib.h>
28
29 #ifndef TRUE
30 #define TRUE 1
31 #define FALSE 0
32 #endif /* !defined TRUE */
33
34 struct rule {
35 const char * r_filename;
36 int r_linenum;
37 const char * r_name;
38
39 int r_loyear; /* for example, 1986 */
40 int r_hiyear; /* for example, 1986 */
41 const char * r_yrtype;
42
43 int r_month; /* 0..11 */
44
45 int r_dycode; /* see below */
46 int r_dayofmonth;
47 int r_wday;
48
49 long r_tod; /* time from midnight */
50 int r_todisstd; /* above is standard time if TRUE */
51 /* or wall clock time if FALSE */
52 long r_stdoff; /* offset from standard time */
53 const char * r_abbrvar; /* variable part of abbreviation */
54
55 int r_todo; /* a rule to do (used in outzone) */
56 time_t r_temp; /* used in outzone */
57 };
58
59 /*
60 ** r_dycode r_dayofmonth r_wday
61 */
62
63 #define DC_DOM 0 /* 1..31 */ /* unused */
64 #define DC_DOWGEQ 1 /* 1..31 */ /* 0..6 (Sun..Sat) */
65 #define DC_DOWLEQ 2 /* 1..31 */ /* 0..6 (Sun..Sat) */
66
67 struct zone {
68 const char * z_filename;
69 int z_linenum;
70
71 const char * z_name;
72 long z_gmtoff;
73 const char * z_rule;
74 const char * z_format;
75
76 long z_stdoff;
77
78 struct rule * z_rules;
79 int z_nrules;
80
81 struct rule z_untilrule;
82 time_t z_untiltime;
83 };
84
85 extern char * icatalloc __P((char * old, const char * new));
86 extern char * icpyalloc __P((const char * string));
87 extern void ifree __P((char * p));
88 extern char * imalloc __P((int n));
89 extern char * irealloc __P((char * old, int n));
90 extern int link __P((const char * fromname, const char * toname));
91 extern char * optarg;
92 extern int optind;
93 extern void perror __P((const char * string));
94 extern char * scheck __P((const char * string, const char * format));
95 static void addtt __P((time_t starttime, int type));
96 static int addtype
97 __P((long gmtoff, const char * abbr, int isdst,
98 int ttisstd));
99 static void addleap __P((time_t t, int positive, int rolling));
100 static void adjleap __P((void));
101 static void associate __P((void));
102 static int ciequal __P((const char * ap, const char * bp));
103 static void convert __P((long val, char * buf));
104 static void dolink __P((const char * fromfile, const char * tofile));
105 static void eat __P((const char * name, int num));
106 static void eats __P((const char * name, int num,
107 const char * rname, int rnum));
108 static long eitol __P((int i));
109 static void error __P((const char * message));
110 static char ** getfields __P((char * buf));
111 static long gethms __P((char * string, const char * errstrng,
112 int signable));
113 static void infile __P((const char * filename));
114 static void inleap __P((char ** fields, int nfields));
115 static void inlink __P((char ** fields, int nfields));
116 static void inrule __P((char ** fields, int nfields));
117 static int inzcont __P((char ** fields, int nfields));
118 static int inzone __P((char ** fields, int nfields));
119 static int inzsub __P((char ** fields, int nfields, int iscont));
120 static int itsabbr __P((const char * abbr, const char * word));
121 static int itsdir __P((const char * name));
122 static int lowerit __P((int c));
123 static char * memcheck __P((char * tocheck));
124 static int mkdirs __P((char * filename));
125 static void newabbr __P((const char * abbr));
126 static long oadd __P((long t1, long t2));
127 static void outzone __P((const struct zone * zp, int ntzones));
128 static void puttzcode __P((long code, FILE * fp));
129 static int rcomp __P((const void *leftp, const void *rightp));
130 static time_t rpytime __P((const struct rule * rp, int wantedy));
131 static void rulesub __P((struct rule * rp, char * loyearp, char * hiyearp,
132 char * typep, char * monthp, char * dayp, char * timep));
133 static void setboundaries __P((void));
134 static time_t tadd __P((time_t t1, long t2));
135 static void usage __P((void));
136 static void writezone __P((const char * name));
137 static int yearistype __P((int year, const char * type));
138
139 static int charcnt;
140 static int errors;
141 static const char * filename;
142 static int leapcnt;
143 static int linenum;
144 static time_t max_time;
145 static int max_year;
146 static time_t min_time;
147 static int min_year;
148 static int noise;
149 static const char * rfilename;
150 static int rlinenum;
151 static const char * progname;
152 static int timecnt;
153 static int typecnt;
154 static int tt_signed;
155
156 /*
157 ** Line codes.
158 */
159
160 #define LC_RULE 0
161 #define LC_ZONE 1
162 #define LC_LINK 2
163 #define LC_LEAP 3
164
165 /*
166 ** Which fields are which on a Zone line.
167 */
168
169 #define ZF_NAME 1
170 #define ZF_GMTOFF 2
171 #define ZF_RULE 3
172 #define ZF_FORMAT 4
173 #define ZF_TILYEAR 5
174 #define ZF_TILMONTH 6
175 #define ZF_TILDAY 7
176 #define ZF_TILTIME 8
177 #define ZONE_MINFIELDS 5
178 #define ZONE_MAXFIELDS 9
179
180 /*
181 ** Which fields are which on a Zone continuation line.
182 */
183
184 #define ZFC_GMTOFF 0
185 #define ZFC_RULE 1
186 #define ZFC_FORMAT 2
187 #define ZFC_TILYEAR 3
188 #define ZFC_TILMONTH 4
189 #define ZFC_TILDAY 5
190 #define ZFC_TILTIME 6
191 #define ZONEC_MINFIELDS 3
192 #define ZONEC_MAXFIELDS 7
193
194 /*
195 ** Which files are which on a Rule line.
196 */
197
198 #define RF_NAME 1
199 #define RF_LOYEAR 2
200 #define RF_HIYEAR 3
201 #define RF_COMMAND 4
202 #define RF_MONTH 5
203 #define RF_DAY 6
204 #define RF_TOD 7
205 #define RF_STDOFF 8
206 #define RF_ABBRVAR 9
207 #define RULE_FIELDS 10
208
209 /*
210 ** Which fields are which on a Link line.
211 */
212
213 #define LF_FROM 1
214 #define LF_TO 2
215 #define LINK_FIELDS 3
216
217 /*
218 ** Which fields are which on a Leap line.
219 */
220
221 #define LP_YEAR 1
222 #define LP_MONTH 2
223 #define LP_DAY 3
224 #define LP_TIME 4
225 #define LP_CORR 5
226 #define LP_ROLL 6
227 #define LEAP_FIELDS 7
228
229 /*
230 ** Year synonyms.
231 */
232
233 #define YR_MINIMUM 0
234 #define YR_MAXIMUM 1
235 #define YR_ONLY 2
236
237 static struct rule * rules;
238 static int nrules; /* number of rules */
239
240 static struct zone * zones;
241 static int nzones; /* number of zones */
242
243 struct link {
244 const char * l_filename;
245 int l_linenum;
246 const char * l_from;
247 const char * l_to;
248 };
249
250 static struct link * links;
251 static int nlinks;
252
253 struct lookup {
254 const char * l_word;
255 const int l_value;
256 };
257
258 static struct lookup const * byword __P((const char * string,
259 const struct lookup * lp));
260
261 static struct lookup const line_codes[] = {
262 "Rule", LC_RULE,
263 "Zone", LC_ZONE,
264 "Link", LC_LINK,
265 "Leap", LC_LEAP,
266 NULL, 0
267 };
268
269 static struct lookup const mon_names[] = {
270 "January", TM_JANUARY,
271 "February", TM_FEBRUARY,
272 "March", TM_MARCH,
273 "April", TM_APRIL,
274 "May", TM_MAY,
275 "June", TM_JUNE,
276 "July", TM_JULY,
277 "August", TM_AUGUST,
278 "September", TM_SEPTEMBER,
279 "October", TM_OCTOBER,
280 "November", TM_NOVEMBER,
281 "December", TM_DECEMBER,
282 NULL, 0
283 };
284
285 static struct lookup const wday_names[] = {
286 "Sunday", TM_SUNDAY,
287 "Monday", TM_MONDAY,
288 "Tuesday", TM_TUESDAY,
289 "Wednesday", TM_WEDNESDAY,
290 "Thursday", TM_THURSDAY,
291 "Friday", TM_FRIDAY,
292 "Saturday", TM_SATURDAY,
293 NULL, 0
294 };
295
296 static struct lookup const lasts[] = {
297 "last-Sunday", TM_SUNDAY,
298 "last-Monday", TM_MONDAY,
299 "last-Tuesday", TM_TUESDAY,
300 "last-Wednesday", TM_WEDNESDAY,
301 "last-Thursday", TM_THURSDAY,
302 "last-Friday", TM_FRIDAY,
303 "last-Saturday", TM_SATURDAY,
304 NULL, 0
305 };
306
307 static struct lookup const begin_years[] = {
308 "minimum", YR_MINIMUM,
309 "maximum", YR_MAXIMUM,
310 NULL, 0
311 };
312
313 static struct lookup const end_years[] = {
314 "minimum", YR_MINIMUM,
315 "maximum", YR_MAXIMUM,
316 "only", YR_ONLY,
317 NULL, 0
318 };
319
320 static struct lookup const leap_types[] = {
321 "Rolling", TRUE,
322 "Stationary", FALSE,
323 NULL, 0
324 };
325
326 static const int len_months[2][MONSPERYEAR] = {
327 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31,
328 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
329 };
330
331 static const int len_years[2] = {
332 DAYSPERNYEAR, DAYSPERLYEAR
333 };
334
335 static time_t ats[TZ_MAX_TIMES];
336 static unsigned char types[TZ_MAX_TIMES];
337 static long gmtoffs[TZ_MAX_TYPES];
338 static char isdsts[TZ_MAX_TYPES];
339 static char abbrinds[TZ_MAX_TYPES];
340 static char ttisstds[TZ_MAX_TYPES];
341 static char chars[TZ_MAX_CHARS];
342 static time_t trans[TZ_MAX_LEAPS];
343 static long corr[TZ_MAX_LEAPS];
344 static char roll[TZ_MAX_LEAPS];
345
346 /*
347 ** Memory allocation.
348 */
349
350 static char *
memcheck(ptr)351 memcheck(ptr)
352 char * const ptr;
353 {
354 if (ptr == NULL) {
355 (void) perror(progname);
356 (void) exit(EXIT_FAILURE);
357 }
358 return ptr;
359 }
360
361 #define emalloc(size) memcheck(imalloc(size))
362 #define erealloc(ptr, size) memcheck(irealloc(ptr, size))
363 #define ecpyalloc(ptr) memcheck(icpyalloc(ptr))
364 #define ecatalloc(oldp, newp) memcheck(icatalloc(oldp, newp))
365
366 /*
367 ** Error handling.
368 */
369
370 static void
eats(name,num,rname,rnum)371 eats(name, num, rname, rnum)
372 const char * const name;
373 const int num;
374 const char * const rname;
375 const int rnum;
376 {
377 filename = name;
378 linenum = num;
379 rfilename = rname;
380 rlinenum = rnum;
381 }
382
383 static void
eat(name,num)384 eat(name, num)
385 const char * const name;
386 const int num;
387 {
388 eats(name, num, (char *) NULL, -1);
389 }
390
391 static void
error(string)392 error(string)
393 const char * const string;
394 {
395 /*
396 ** Match the format of "cc" to allow sh users to
397 ** zic ... 2>&1 | error -t "*" -v
398 ** on BSD systems.
399 */
400 (void) fprintf(stderr, "\"%s\", line %d: %s",
401 filename, linenum, string);
402 if (rfilename != NULL)
403 (void) fprintf(stderr, " (rule from \"%s\", line %d)",
404 rfilename, rlinenum);
405 (void) fprintf(stderr, "\n");
406 ++errors;
407 }
408
409 static void
usage()410 usage()
411 {
412 (void) fprintf(stderr,
413 "%s: usage is %s [ -s ] [ -v ] [ -l localtime ] [ -p posixrules ] [ -d directory ]\n\
414 \t[ -L leapseconds ] [ filename ... ]\n",
415 progname, progname);
416 (void) exit(EXIT_FAILURE);
417 }
418
419 static const char * psxrules = NULL;
420 static const char * lcltime = NULL;
421 static const char * directory = NULL;
422 static const char * leapsec = NULL;
423 static int sflag = FALSE;
424
425 int
main(argc,argv)426 main(argc, argv)
427 int argc;
428 char * argv[];
429 {
430 register int i, j;
431 register int c;
432
433 (void) umask(umask(022) | 022);
434 progname = argv[0];
435 while ((c = getopt(argc, argv, "d:l:p:L:vs")) != EOF)
436 switch (c) {
437 default:
438 usage();
439 case 'd':
440 if (directory == NULL)
441 directory = optarg;
442 else {
443 (void) fprintf(stderr,
444 "%s: More than one -d option specified\n",
445 progname);
446 (void) exit(EXIT_FAILURE);
447 }
448 break;
449 case 'l':
450 if (lcltime == NULL)
451 lcltime = optarg;
452 else {
453 (void) fprintf(stderr,
454 "%s: More than one -l option specified\n",
455 progname);
456 (void) exit(EXIT_FAILURE);
457 }
458 break;
459 case 'p':
460 if (psxrules == NULL)
461 psxrules = optarg;
462 else {
463 (void) fprintf(stderr,
464 "%s: More than one -p option specified\n",
465 progname);
466 (void) exit(EXIT_FAILURE);
467 }
468 break;
469 case 'L':
470 if (leapsec == NULL)
471 leapsec = optarg;
472 else {
473 (void) fprintf(stderr,
474 "%s: More than one -L option specified\n",
475 progname);
476 (void) exit(EXIT_FAILURE);
477 }
478 break;
479 case 'v':
480 noise = TRUE;
481 break;
482 case 's':
483 sflag = TRUE;
484 break;
485 }
486 if (optind == argc - 1 && strcmp(argv[optind], "=") == 0)
487 usage(); /* usage message by request */
488 if (directory == NULL)
489 directory = TZDIR;
490
491 setboundaries();
492
493 if (optind < argc && leapsec != NULL) {
494 infile(leapsec);
495 adjleap();
496 }
497
498 zones = (struct zone *) emalloc(0);
499 rules = (struct rule *) emalloc(0);
500 links = (struct link *) emalloc(0);
501 for (i = optind; i < argc; ++i)
502 infile(argv[i]);
503 if (errors)
504 (void) exit(EXIT_FAILURE);
505 associate();
506 for (i = 0; i < nzones; i = j) {
507 /*
508 ** Find the next non-continuation zone entry.
509 */
510 for (j = i + 1; j < nzones && zones[j].z_name == NULL; ++j)
511 ;
512 outzone(&zones[i], j - i);
513 }
514 /*
515 ** Make links.
516 */
517 for (i = 0; i < nlinks; ++i)
518 dolink(links[i].l_from, links[i].l_to);
519 if (lcltime != NULL)
520 dolink(lcltime, TZDEFAULT);
521 if (psxrules != NULL)
522 dolink(psxrules, TZDEFRULES);
523 return (errors == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
524 }
525
526 static void
dolink(fromfile,tofile)527 dolink(fromfile, tofile)
528 const char * const fromfile;
529 const char * const tofile;
530 {
531 register char * fromname;
532 register char * toname;
533
534 fromname = ecpyalloc(directory);
535 fromname = ecatalloc(fromname, "/");
536 fromname = ecatalloc(fromname, fromfile);
537 toname = ecpyalloc(directory);
538 toname = ecatalloc(toname, "/");
539 toname = ecatalloc(toname, tofile);
540 /*
541 ** We get to be careful here since
542 ** there's a fair chance of root running us.
543 */
544 if (!itsdir(toname))
545 (void) remove(toname);
546 if (link(fromname, toname) != 0) {
547 (void) fprintf(stderr, "%s: Can't link from %s to ",
548 progname, fromname);
549 (void) perror(toname);
550 (void) exit(EXIT_FAILURE);
551 }
552 ifree(fromname);
553 ifree(toname);
554 }
555
556 static void
setboundaries()557 setboundaries()
558 {
559 register time_t bit;
560
561 for (bit = 1; bit > 0; bit <<= 1)
562 ;
563 if (bit == 0) { /* time_t is an unsigned type */
564 tt_signed = FALSE;
565 min_time = 0;
566 max_time = ~(time_t) 0;
567 if (sflag)
568 max_time >>= 1;
569 } else {
570 tt_signed = TRUE;
571 min_time = bit;
572 max_time = bit;
573 ++max_time;
574 max_time = -max_time;
575 if (sflag)
576 min_time = 0;
577 }
578 min_year = TM_YEAR_BASE + gmtime(&min_time)->tm_year;
579 max_year = TM_YEAR_BASE + gmtime(&max_time)->tm_year;
580 }
581
582 static int
itsdir(name)583 itsdir(name)
584 const char * const name;
585 {
586 struct stat s;
587
588 return (stat(name, &s) == 0 && S_ISDIR(s.st_mode));
589 }
590
591 /*
592 ** Associate sets of rules with zones.
593 */
594
595 /*
596 ** Sort by rule name.
597 */
598
599 static int
rcomp(cp1,cp2)600 rcomp(cp1, cp2)
601 const void * cp1;
602 const void * cp2;
603 {
604 return strcmp(((struct rule *) cp1)->r_name,
605 ((struct rule *) cp2)->r_name);
606 }
607
608 static void
associate()609 associate()
610 {
611 register struct zone * zp;
612 register struct rule * rp;
613 register int base, out;
614 register int i;
615
616 if (nrules != 0)
617 (void) qsort((void *) rules, (size_t) nrules,
618 (size_t) sizeof *rules, rcomp);
619 for (i = 0; i < nzones; ++i) {
620 zp = &zones[i];
621 zp->z_rules = NULL;
622 zp->z_nrules = 0;
623 }
624 for (base = 0; base < nrules; base = out) {
625 rp = &rules[base];
626 for (out = base + 1; out < nrules; ++out)
627 if (strcmp(rp->r_name, rules[out].r_name) != 0)
628 break;
629 for (i = 0; i < nzones; ++i) {
630 zp = &zones[i];
631 if (strcmp(zp->z_rule, rp->r_name) != 0)
632 continue;
633 zp->z_rules = rp;
634 zp->z_nrules = out - base;
635 }
636 }
637 for (i = 0; i < nzones; ++i) {
638 zp = &zones[i];
639 if (zp->z_nrules == 0) {
640 /*
641 ** Maybe we have a local standard time offset.
642 */
643 eat(zp->z_filename, zp->z_linenum);
644 zp->z_stdoff =
645 gethms((char *)zp->z_rule, "unruly zone", TRUE);
646 /*
647 ** Note, though, that if there's no rule,
648 ** a '%s' in the format is a bad thing.
649 */
650 if (strchr(zp->z_format, '%') != 0)
651 error("%s in ruleless zone");
652 }
653 }
654 if (errors)
655 (void) exit(EXIT_FAILURE);
656 }
657
658 static void
infile(name)659 infile(name)
660 const char * name;
661 {
662 register FILE * fp;
663 register char ** fields;
664 register char * cp;
665 register const struct lookup * lp;
666 register int nfields;
667 register int wantcont;
668 register int num;
669 char buf[BUFSIZ];
670
671 if (strcmp(name, "-") == 0) {
672 name = "standard input";
673 fp = stdin;
674 } else if ((fp = fopen(name, "r")) == NULL) {
675 (void) fprintf(stderr, "%s: Can't open ", progname);
676 (void) perror(name);
677 (void) exit(EXIT_FAILURE);
678 }
679 wantcont = FALSE;
680 for (num = 1; ; ++num) {
681 eat(name, num);
682 if (fgets(buf, (int) sizeof buf, fp) != buf)
683 break;
684 cp = strchr(buf, '\n');
685 if (cp == NULL) {
686 error("line too long");
687 (void) exit(EXIT_FAILURE);
688 }
689 *cp = '\0';
690 fields = getfields(buf);
691 nfields = 0;
692 while (fields[nfields] != NULL) {
693 if (ciequal(fields[nfields], "-"))
694 fields[nfields] = "";
695 ++nfields;
696 }
697 if (nfields == 0) {
698 /* nothing to do */
699 } else if (wantcont) {
700 wantcont = inzcont(fields, nfields);
701 } else {
702 lp = byword(fields[0], line_codes);
703 if (lp == NULL)
704 error("input line of unknown type");
705 else switch ((int) (lp->l_value)) {
706 case LC_RULE:
707 inrule(fields, nfields);
708 wantcont = FALSE;
709 break;
710 case LC_ZONE:
711 wantcont = inzone(fields, nfields);
712 break;
713 case LC_LINK:
714 inlink(fields, nfields);
715 wantcont = FALSE;
716 break;
717 case LC_LEAP:
718 if (name != leapsec)
719 (void) fprintf(stderr,
720 "%s: Leap line in non leap seconds file %s\n",
721 progname, name);
722 else inleap(fields, nfields);
723 wantcont = FALSE;
724 break;
725 default: /* "cannot happen" */
726 (void) fprintf(stderr,
727 "%s: panic: Invalid l_value %d\n",
728 progname, lp->l_value);
729 (void) exit(EXIT_FAILURE);
730 }
731 }
732 ifree((char *) fields);
733 }
734 if (ferror(fp)) {
735 (void) fprintf(stderr, "%s: Error reading ", progname);
736 (void) perror(filename);
737 (void) exit(EXIT_FAILURE);
738 }
739 if (fp != stdin && fclose(fp)) {
740 (void) fprintf(stderr, "%s: Error closing ", progname);
741 (void) perror(filename);
742 (void) exit(EXIT_FAILURE);
743 }
744 if (wantcont)
745 error("expected continuation line not found");
746 }
747
748 /*
749 ** Convert a string of one of the forms
750 ** h -h hh:mm -hh:mm hh:mm:ss -hh:mm:ss
751 ** into a number of seconds.
752 ** A null string maps to zero.
753 ** Call error with errstring and return zero on errors.
754 */
755
756 static long
gethms(string,errstring,signable)757 gethms(string, errstring, signable)
758 char * string;
759 const char * const errstring;
760 const int signable;
761 {
762 int hh, mm, ss, sign;
763
764 if (string == NULL || *string == '\0')
765 return 0;
766 if (!signable)
767 sign = 1;
768 else if (*string == '-') {
769 sign = -1;
770 ++string;
771 } else sign = 1;
772 if (sscanf(string, scheck(string, "%d"), &hh) == 1)
773 mm = ss = 0;
774 else if (sscanf(string, scheck(string, "%d:%d"), &hh, &mm) == 2)
775 ss = 0;
776 else if (sscanf(string, scheck(string, "%d:%d:%d"),
777 &hh, &mm, &ss) != 3) {
778 error(errstring);
779 return 0;
780 }
781 if (hh < 0 || hh >= HOURSPERDAY ||
782 mm < 0 || mm >= MINSPERHOUR ||
783 ss < 0 || ss > SECSPERMIN) {
784 error(errstring);
785 return 0;
786 }
787 return eitol(sign) *
788 (eitol(hh * MINSPERHOUR + mm) *
789 eitol(SECSPERMIN) + eitol(ss));
790 }
791
792 static void
inrule(fields,nfields)793 inrule(fields, nfields)
794 register char ** const fields;
795 const int nfields;
796 {
797 static struct rule r;
798
799 if (nfields != RULE_FIELDS) {
800 error("wrong number of fields on Rule line");
801 return;
802 }
803 if (*fields[RF_NAME] == '\0') {
804 error("nameless rule");
805 return;
806 }
807 r.r_filename = filename;
808 r.r_linenum = linenum;
809 r.r_stdoff = gethms(fields[RF_STDOFF], "invalid saved time", TRUE);
810 rulesub(&r, fields[RF_LOYEAR], fields[RF_HIYEAR], fields[RF_COMMAND],
811 fields[RF_MONTH], fields[RF_DAY], fields[RF_TOD]);
812 r.r_name = ecpyalloc(fields[RF_NAME]);
813 r.r_abbrvar = ecpyalloc(fields[RF_ABBRVAR]);
814 rules = (struct rule *) erealloc((char *) rules,
815 (int) ((nrules + 1) * sizeof *rules));
816 rules[nrules++] = r;
817 }
818
819 static int
inzone(fields,nfields)820 inzone(fields, nfields)
821 register char ** const fields;
822 const int nfields;
823 {
824 register int i;
825 char buf[132];
826
827 if (nfields < ZONE_MINFIELDS || nfields > ZONE_MAXFIELDS) {
828 error("wrong number of fields on Zone line");
829 return FALSE;
830 }
831 if (strcmp(fields[ZF_NAME], TZDEFAULT) == 0 && lcltime != NULL) {
832 (void) sprintf(buf,
833 "\"Zone %s\" line and -l option are mutually exclusive",
834 TZDEFAULT);
835 error(buf);
836 return FALSE;
837 }
838 if (strcmp(fields[ZF_NAME], TZDEFRULES) == 0 && psxrules != NULL) {
839 (void) sprintf(buf,
840 "\"Zone %s\" line and -p option are mutually exclusive",
841 TZDEFRULES);
842 error(buf);
843 return FALSE;
844 }
845 for (i = 0; i < nzones; ++i)
846 if (zones[i].z_name != NULL &&
847 strcmp(zones[i].z_name, fields[ZF_NAME]) == 0) {
848 (void) sprintf(buf,
849 "duplicate zone name %s (file \"%s\", line %d)",
850 fields[ZF_NAME],
851 zones[i].z_filename,
852 zones[i].z_linenum);
853 error(buf);
854 return FALSE;
855 }
856 return inzsub(fields, nfields, FALSE);
857 }
858
859 static int
inzcont(fields,nfields)860 inzcont(fields, nfields)
861 register char ** const fields;
862 const int nfields;
863 {
864 if (nfields < ZONEC_MINFIELDS || nfields > ZONEC_MAXFIELDS) {
865 error("wrong number of fields on Zone continuation line");
866 return FALSE;
867 }
868 return inzsub(fields, nfields, TRUE);
869 }
870
871 static int
inzsub(fields,nfields,iscont)872 inzsub(fields, nfields, iscont)
873 register char ** const fields;
874 const int nfields;
875 const int iscont;
876 {
877 register char * cp;
878 static struct zone z;
879 register int i_gmtoff, i_rule, i_format;
880 register int i_untilyear, i_untilmonth;
881 register int i_untilday, i_untiltime;
882 register int hasuntil;
883
884 if (iscont) {
885 i_gmtoff = ZFC_GMTOFF;
886 i_rule = ZFC_RULE;
887 i_format = ZFC_FORMAT;
888 i_untilyear = ZFC_TILYEAR;
889 i_untilmonth = ZFC_TILMONTH;
890 i_untilday = ZFC_TILDAY;
891 i_untiltime = ZFC_TILTIME;
892 z.z_name = NULL;
893 } else {
894 i_gmtoff = ZF_GMTOFF;
895 i_rule = ZF_RULE;
896 i_format = ZF_FORMAT;
897 i_untilyear = ZF_TILYEAR;
898 i_untilmonth = ZF_TILMONTH;
899 i_untilday = ZF_TILDAY;
900 i_untiltime = ZF_TILTIME;
901 z.z_name = ecpyalloc(fields[ZF_NAME]);
902 }
903 z.z_filename = filename;
904 z.z_linenum = linenum;
905 z.z_gmtoff = gethms(fields[i_gmtoff], "invalid GMT offset", TRUE);
906 if ((cp = strchr(fields[i_format], '%')) != 0) {
907 if (*++cp != 's' || strchr(cp, '%') != 0) {
908 error("invalid abbreviation format");
909 return FALSE;
910 }
911 }
912 z.z_rule = ecpyalloc(fields[i_rule]);
913 z.z_format = ecpyalloc(fields[i_format]);
914 hasuntil = nfields > i_untilyear;
915 if (hasuntil) {
916 z.z_untilrule.r_filename = filename;
917 z.z_untilrule.r_linenum = linenum;
918 rulesub(&z.z_untilrule,
919 fields[i_untilyear],
920 "only",
921 "",
922 (nfields > i_untilmonth) ? fields[i_untilmonth] : "Jan",
923 (nfields > i_untilday) ? fields[i_untilday] : "1",
924 (nfields > i_untiltime) ? fields[i_untiltime] : "0");
925 z.z_untiltime = rpytime(&z.z_untilrule, z.z_untilrule.r_loyear);
926 if (iscont && nzones > 0 && z.z_untiltime < max_time &&
927 z.z_untiltime > min_time &&
928 zones[nzones - 1].z_untiltime >= z.z_untiltime) {
929 error("Zone continuation line end time is not after end time of previous line");
930 return FALSE;
931 }
932 }
933 zones = (struct zone *) erealloc((char *) zones,
934 (int) ((nzones + 1) * sizeof *zones));
935 zones[nzones++] = z;
936 /*
937 ** If there was an UNTIL field on this line,
938 ** there's more information about the zone on the next line.
939 */
940 return hasuntil;
941 }
942
943 static void
inleap(fields,nfields)944 inleap(fields, nfields)
945 register char ** const fields;
946 const int nfields;
947 {
948 register const char * cp;
949 register const struct lookup * lp;
950 register int i, j;
951 int year, month, day;
952 long dayoff, tod;
953 time_t t;
954
955 if (nfields != LEAP_FIELDS) {
956 error("wrong number of fields on Leap line");
957 return;
958 }
959 dayoff = 0;
960 cp = fields[LP_YEAR];
961 if (sscanf((char *)cp, scheck(cp, "%d"), &year) != 1 ||
962 year < min_year || year > max_year) {
963 /*
964 * Leapin' Lizards!
965 */
966 error("invalid leaping year");
967 return;
968 }
969 j = EPOCH_YEAR;
970 while (j != year) {
971 if (year > j) {
972 i = len_years[isleap(j)];
973 ++j;
974 } else {
975 --j;
976 i = -len_years[isleap(j)];
977 }
978 dayoff = oadd(dayoff, eitol(i));
979 }
980 if ((lp = byword(fields[LP_MONTH], mon_names)) == NULL) {
981 error("invalid month name");
982 return;
983 }
984 month = lp->l_value;
985 j = TM_JANUARY;
986 while (j != month) {
987 i = len_months[isleap(year)][j];
988 dayoff = oadd(dayoff, eitol(i));
989 ++j;
990 }
991 cp = fields[LP_DAY];
992 if (sscanf((char *)cp, scheck(cp, "%d"), &day) != 1 ||
993 day <= 0 || day > len_months[isleap(year)][month]) {
994 error("invalid day of month");
995 return;
996 }
997 dayoff = oadd(dayoff, eitol(day - 1));
998 if (dayoff < 0 && !tt_signed) {
999 error("time before zero");
1000 return;
1001 }
1002 t = (time_t) dayoff * SECSPERDAY;
1003 /*
1004 ** Cheap overflow check.
1005 */
1006 if (t / SECSPERDAY != dayoff) {
1007 error("time overflow");
1008 return;
1009 }
1010 tod = gethms(fields[LP_TIME], "invalid time of day", FALSE);
1011 cp = fields[LP_CORR];
1012 if (strcmp(cp, "+") != 0 && strcmp(cp, "") != 0) {
1013 /* infile() turned "-" into "" */
1014 error("illegal CORRECTION field on Leap line");
1015 return;
1016 }
1017 if ((lp = byword(fields[LP_ROLL], leap_types)) == NULL) {
1018 error("illegal Rolling/Stationary field on Leap line");
1019 return;
1020 }
1021 addleap(tadd(t, tod), *cp == '+', lp->l_value);
1022 }
1023
1024 static void
inlink(fields,nfields)1025 inlink(fields, nfields)
1026 register char ** const fields;
1027 const int nfields;
1028 {
1029 struct link l;
1030
1031 if (nfields != LINK_FIELDS) {
1032 error("wrong number of fields on Link line");
1033 return;
1034 }
1035 if (*fields[LF_FROM] == '\0') {
1036 error("blank FROM field on Link line");
1037 return;
1038 }
1039 if (*fields[LF_TO] == '\0') {
1040 error("blank TO field on Link line");
1041 return;
1042 }
1043 l.l_filename = filename;
1044 l.l_linenum = linenum;
1045 l.l_from = ecpyalloc(fields[LF_FROM]);
1046 l.l_to = ecpyalloc(fields[LF_TO]);
1047 links = (struct link *) erealloc((char *) links,
1048 (int) ((nlinks + 1) * sizeof *links));
1049 links[nlinks++] = l;
1050 }
1051
1052 static void
rulesub(rp,loyearp,hiyearp,typep,monthp,dayp,timep)1053 rulesub(rp, loyearp, hiyearp, typep, monthp, dayp, timep)
1054 register struct rule * const rp;
1055 char * const loyearp;
1056 char * const hiyearp;
1057 char * const typep;
1058 char * const monthp;
1059 char * const dayp;
1060 char * const timep;
1061 {
1062 register struct lookup const * lp;
1063 register char * cp;
1064
1065 if ((lp = byword(monthp, mon_names)) == NULL) {
1066 error("invalid month name");
1067 return;
1068 }
1069 rp->r_month = lp->l_value;
1070 rp->r_todisstd = FALSE;
1071 cp = timep;
1072 if (*cp != '\0') {
1073 cp += strlen(cp) - 1;
1074 switch (lowerit(*cp)) {
1075 case 's':
1076 rp->r_todisstd = TRUE;
1077 *cp = '\0';
1078 break;
1079 case 'w':
1080 rp->r_todisstd = FALSE;
1081 *cp = '\0';
1082 break;
1083 }
1084 }
1085 rp->r_tod = gethms(timep, "invalid time of day", FALSE);
1086 /*
1087 ** Year work.
1088 */
1089 cp = loyearp;
1090 if ((lp = byword(cp, begin_years)) != NULL) switch ((int) lp->l_value) {
1091 case YR_MINIMUM:
1092 rp->r_loyear = min_year;
1093 break;
1094 case YR_MAXIMUM:
1095 rp->r_loyear = max_year;
1096 break;
1097 default: /* "cannot happen" */
1098 (void) fprintf(stderr,
1099 "%s: panic: Invalid l_value %d\n",
1100 progname, lp->l_value);
1101 (void) exit(EXIT_FAILURE);
1102 } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_loyear) != 1 ||
1103 rp->r_loyear < min_year || rp->r_loyear > max_year) {
1104 if (noise)
1105 error("invalid starting year");
1106 if (rp->r_loyear > max_year)
1107 return;
1108 }
1109 cp = hiyearp;
1110 if ((lp = byword(cp, end_years)) != NULL) switch ((int) lp->l_value) {
1111 case YR_MINIMUM:
1112 rp->r_hiyear = min_year;
1113 break;
1114 case YR_MAXIMUM:
1115 rp->r_hiyear = max_year;
1116 break;
1117 case YR_ONLY:
1118 rp->r_hiyear = rp->r_loyear;
1119 break;
1120 default: /* "cannot happen" */
1121 (void) fprintf(stderr,
1122 "%s: panic: Invalid l_value %d\n",
1123 progname, lp->l_value);
1124 (void) exit(EXIT_FAILURE);
1125 } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_hiyear) != 1 ||
1126 rp->r_hiyear < min_year || rp->r_hiyear > max_year) {
1127 if (noise)
1128 error("invalid ending year");
1129 if (rp->r_hiyear < min_year)
1130 return;
1131 }
1132 if (rp->r_hiyear < min_year)
1133 return;
1134 if (rp->r_loyear < min_year)
1135 rp->r_loyear = min_year;
1136 if (rp->r_hiyear > max_year)
1137 rp->r_hiyear = max_year;
1138 if (rp->r_loyear > rp->r_hiyear) {
1139 error("starting year greater than ending year");
1140 return;
1141 }
1142 if (*typep == '\0')
1143 rp->r_yrtype = NULL;
1144 else {
1145 if (rp->r_loyear == rp->r_hiyear) {
1146 error("typed single year");
1147 return;
1148 }
1149 rp->r_yrtype = ecpyalloc(typep);
1150 }
1151 /*
1152 ** Day work.
1153 ** Accept things such as:
1154 ** 1
1155 ** last-Sunday
1156 ** Sun<=20
1157 ** Sun>=7
1158 */
1159 if ((lp = byword(dayp, lasts)) != NULL) {
1160 rp->r_dycode = DC_DOWLEQ;
1161 rp->r_wday = lp->l_value;
1162 rp->r_dayofmonth = len_months[1][rp->r_month];
1163 } else {
1164 if ((cp = strchr(dayp, '<')) != 0)
1165 rp->r_dycode = DC_DOWLEQ;
1166 else if ((cp = strchr(dayp, '>')) != 0)
1167 rp->r_dycode = DC_DOWGEQ;
1168 else {
1169 cp = dayp;
1170 rp->r_dycode = DC_DOM;
1171 }
1172 if (rp->r_dycode != DC_DOM) {
1173 *cp++ = 0;
1174 if (*cp++ != '=') {
1175 error("invalid day of month");
1176 return;
1177 }
1178 if ((lp = byword(dayp, wday_names)) == NULL) {
1179 error("invalid weekday name");
1180 return;
1181 }
1182 rp->r_wday = lp->l_value;
1183 }
1184 if (sscanf(cp, scheck(cp, "%d"), &rp->r_dayofmonth) != 1 ||
1185 rp->r_dayofmonth <= 0 ||
1186 (rp->r_dayofmonth > len_months[1][rp->r_month])) {
1187 error("invalid day of month");
1188 return;
1189 }
1190 }
1191 }
1192
1193 static void
convert(val,buf)1194 convert(val, buf)
1195 const long val;
1196 char * const buf;
1197 {
1198 register int i;
1199 register long shift;
1200
1201 for (i = 0, shift = 24; i < 4; ++i, shift -= 8)
1202 buf[i] = val >> shift;
1203 }
1204
1205 static void
puttzcode(val,fp)1206 puttzcode(val, fp)
1207 const long val;
1208 FILE * const fp;
1209 {
1210 char buf[4];
1211
1212 convert(val, buf);
1213 (void) fwrite((void *) buf, (size_t) sizeof buf, (size_t) 1, fp);
1214 }
1215
1216 static void
writezone(name)1217 writezone(name)
1218 const char * const name;
1219 {
1220 register FILE * fp;
1221 register int i, j;
1222 char fullname[BUFSIZ];
1223 static struct tzhead tzh;
1224
1225 if (strlen(directory) + 1 + strlen(name) >= sizeof fullname) {
1226 (void) fprintf(stderr,
1227 "%s: File name %s/%s too long\n", progname,
1228 directory, name);
1229 (void) exit(EXIT_FAILURE);
1230 }
1231 (void) sprintf(fullname, "%s/%s", directory, name);
1232 if ((fp = fopen(fullname, "wb")) == NULL) {
1233 if (mkdirs(fullname) != 0)
1234 (void) exit(EXIT_FAILURE);
1235 if ((fp = fopen(fullname, "wb")) == NULL) {
1236 (void) fprintf(stderr, "%s: Can't create ", progname);
1237 (void) perror(fullname);
1238 (void) exit(EXIT_FAILURE);
1239 }
1240 }
1241 convert(eitol(typecnt), tzh.tzh_ttisstdcnt);
1242 convert(eitol(leapcnt), tzh.tzh_leapcnt);
1243 convert(eitol(timecnt), tzh.tzh_timecnt);
1244 convert(eitol(typecnt), tzh.tzh_typecnt);
1245 convert(eitol(charcnt), tzh.tzh_charcnt);
1246 (void) fwrite((void *) &tzh, (size_t) sizeof tzh, (size_t) 1, fp);
1247 for (i = 0; i < timecnt; ++i) {
1248 j = leapcnt;
1249 while (--j >= 0)
1250 if (ats[i] >= trans[j]) {
1251 ats[i] = tadd(ats[i], corr[j]);
1252 break;
1253 }
1254 puttzcode((long) ats[i], fp);
1255 }
1256 if (timecnt > 0)
1257 (void) fwrite((void *) types, (size_t) sizeof types[0],
1258 (size_t) timecnt, fp);
1259 for (i = 0; i < typecnt; ++i) {
1260 puttzcode((long) gmtoffs[i], fp);
1261 (void) putc(isdsts[i], fp);
1262 (void) putc(abbrinds[i], fp);
1263 }
1264 if (charcnt != 0)
1265 (void) fwrite((void *) chars, (size_t) sizeof chars[0],
1266 (size_t) charcnt, fp);
1267 for (i = 0; i < leapcnt; ++i) {
1268 if (roll[i]) {
1269 if (timecnt == 0 || trans[i] < ats[0]) {
1270 j = 0;
1271 while (isdsts[j])
1272 if (++j >= typecnt) {
1273 j = 0;
1274 break;
1275 }
1276 } else {
1277 j = 1;
1278 while (j < timecnt && trans[i] >= ats[j])
1279 ++j;
1280 j = types[j - 1];
1281 }
1282 puttzcode((long) tadd(trans[i], -gmtoffs[j]), fp);
1283 } else puttzcode((long) trans[i], fp);
1284 puttzcode((long) corr[i], fp);
1285 }
1286 for (i = 0; i < typecnt; ++i)
1287 (void) putc(ttisstds[i], fp);
1288 if (ferror(fp) || fclose(fp)) {
1289 (void) fprintf(stderr, "%s: Write error on ", progname);
1290 (void) perror(fullname);
1291 (void) exit(EXIT_FAILURE);
1292 }
1293 }
1294
1295 static void
outzone(zpfirst,zonecount)1296 outzone(zpfirst, zonecount)
1297 const struct zone * const zpfirst;
1298 const int zonecount;
1299 {
1300 register const struct zone * zp;
1301 register struct rule * rp;
1302 register int i, j;
1303 register int usestart, useuntil;
1304 register time_t starttime, untiltime;
1305 register long gmtoff;
1306 register long stdoff;
1307 register int year;
1308 register long startoff;
1309 register int startisdst;
1310 register int startttisstd;
1311 register int type;
1312 char startbuf[BUFSIZ];
1313
1314 /*
1315 ** Now. . .finally. . .generate some useful data!
1316 */
1317 timecnt = 0;
1318 typecnt = 0;
1319 charcnt = 0;
1320 /*
1321 ** Two guesses. . .the second may well be corrected later.
1322 */
1323 gmtoff = zpfirst->z_gmtoff;
1324 stdoff = 0;
1325 starttime = 0;
1326 startttisstd = FALSE;
1327 for (i = 0; i < zonecount; ++i) {
1328 usestart = i > 0;
1329 useuntil = i < (zonecount - 1);
1330 zp = &zpfirst[i];
1331 eat(zp->z_filename, zp->z_linenum);
1332 startisdst = -1;
1333 if (zp->z_nrules == 0) {
1334 type = addtype(oadd(zp->z_gmtoff, zp->z_stdoff),
1335 zp->z_format, zp->z_stdoff != 0,
1336 startttisstd);
1337 if (usestart)
1338 addtt(starttime, type);
1339 gmtoff = zp->z_gmtoff;
1340 stdoff = zp->z_stdoff;
1341 } else for (year = min_year; year <= max_year; ++year) {
1342 if (useuntil && year > zp->z_untilrule.r_hiyear)
1343 break;
1344 /*
1345 ** Mark which rules to do in the current year.
1346 ** For those to do, calculate rpytime(rp, year);
1347 */
1348 for (j = 0; j < zp->z_nrules; ++j) {
1349 rp = &zp->z_rules[j];
1350 eats(zp->z_filename, zp->z_linenum,
1351 rp->r_filename, rp->r_linenum);
1352 rp->r_todo = year >= rp->r_loyear &&
1353 year <= rp->r_hiyear &&
1354 yearistype(year, rp->r_yrtype);
1355 if (rp->r_todo)
1356 rp->r_temp = rpytime(rp, year);
1357 }
1358 for ( ; ; ) {
1359 register int k;
1360 register time_t jtime, ktime;
1361 register long offset;
1362 char buf[BUFSIZ];
1363
1364 if (useuntil) {
1365 /*
1366 ** Turn untiltime into GMT
1367 ** assuming the current gmtoff and
1368 ** stdoff values.
1369 */
1370 offset = gmtoff;
1371 if (!zp->z_untilrule.r_todisstd)
1372 offset = oadd(offset, stdoff);
1373 untiltime = tadd(zp->z_untiltime,
1374 -offset);
1375 }
1376 /*
1377 ** Find the rule (of those to do, if any)
1378 ** that takes effect earliest in the year.
1379 */
1380 k = -1;
1381 #ifdef lint
1382 ktime = 0;
1383 #endif /* defined lint */
1384 for (j = 0; j < zp->z_nrules; ++j) {
1385 rp = &zp->z_rules[j];
1386 if (!rp->r_todo)
1387 continue;
1388 eats(zp->z_filename, zp->z_linenum,
1389 rp->r_filename, rp->r_linenum);
1390 offset = gmtoff;
1391 if (!rp->r_todisstd)
1392 offset = oadd(offset, stdoff);
1393 jtime = rp->r_temp;
1394 if (jtime == min_time ||
1395 jtime == max_time)
1396 continue;
1397 jtime = tadd(jtime, -offset);
1398 if (k < 0 || jtime < ktime) {
1399 k = j;
1400 ktime = jtime;
1401 }
1402 }
1403 if (k < 0)
1404 break; /* go on to next year */
1405 rp = &zp->z_rules[k];
1406 rp->r_todo = FALSE;
1407 if (useuntil && ktime >= untiltime)
1408 break;
1409 if (usestart) {
1410 if (ktime < starttime) {
1411 stdoff = rp->r_stdoff;
1412 startoff = oadd(zp->z_gmtoff,
1413 rp->r_stdoff);
1414 (void) sprintf(startbuf,
1415 zp->z_format,
1416 rp->r_abbrvar);
1417 startisdst =
1418 rp->r_stdoff != 0;
1419 continue;
1420 }
1421 if (ktime != starttime &&
1422 startisdst >= 0)
1423 addtt(starttime, addtype(startoff, startbuf, startisdst, startttisstd));
1424 usestart = FALSE;
1425 }
1426 eats(zp->z_filename, zp->z_linenum,
1427 rp->r_filename, rp->r_linenum);
1428 (void) sprintf(buf, zp->z_format,
1429 rp->r_abbrvar);
1430 offset = oadd(zp->z_gmtoff, rp->r_stdoff);
1431 type = addtype(offset, buf, rp->r_stdoff != 0,
1432 rp->r_todisstd);
1433 if (timecnt != 0 || rp->r_stdoff != 0)
1434 addtt(ktime, type);
1435 gmtoff = zp->z_gmtoff;
1436 stdoff = rp->r_stdoff;
1437 }
1438 }
1439 /*
1440 ** Now we may get to set starttime for the next zone line.
1441 */
1442 if (useuntil) {
1443 starttime = tadd(zp->z_untiltime,
1444 -gmtoffs[types[timecnt - 1]]);
1445 startttisstd = zp->z_untilrule.r_todisstd;
1446 }
1447 }
1448 writezone(zpfirst->z_name);
1449 }
1450
1451 static void
addtt(starttime,type)1452 addtt(starttime, type)
1453 const time_t starttime;
1454 const int type;
1455 {
1456 if (timecnt != 0 && type == types[timecnt - 1])
1457 return; /* easy enough! */
1458 if (timecnt >= TZ_MAX_TIMES) {
1459 error("too many transitions?!");
1460 (void) exit(EXIT_FAILURE);
1461 }
1462 ats[timecnt] = starttime;
1463 types[timecnt] = type;
1464 ++timecnt;
1465 }
1466
1467 static int
addtype(gmtoff,abbr,isdst,ttisstd)1468 addtype(gmtoff, abbr, isdst, ttisstd)
1469 const long gmtoff;
1470 const char * const abbr;
1471 const int isdst;
1472 const int ttisstd;
1473 {
1474 register int i, j;
1475
1476 /*
1477 ** See if there's already an entry for this zone type.
1478 ** If so, just return its index.
1479 */
1480 for (i = 0; i < typecnt; ++i) {
1481 if (gmtoff == gmtoffs[i] && isdst == isdsts[i] &&
1482 strcmp(abbr, &chars[abbrinds[i]]) == 0 &&
1483 ttisstd == ttisstds[i])
1484 return i;
1485 }
1486 /*
1487 ** There isn't one; add a new one, unless there are already too
1488 ** many.
1489 */
1490 if (typecnt >= TZ_MAX_TYPES) {
1491 error("too many local time types");
1492 (void) exit(EXIT_FAILURE);
1493 }
1494 gmtoffs[i] = gmtoff;
1495 isdsts[i] = isdst;
1496 ttisstds[i] = ttisstd;
1497
1498 for (j = 0; j < charcnt; ++j)
1499 if (strcmp(&chars[j], abbr) == 0)
1500 break;
1501 if (j == charcnt)
1502 newabbr(abbr);
1503 abbrinds[i] = j;
1504 ++typecnt;
1505 return i;
1506 }
1507
1508 static void
addleap(t,positive,rolling)1509 addleap(t, positive, rolling)
1510 const time_t t;
1511 const int positive;
1512 const int rolling;
1513 {
1514 register int i, j;
1515
1516 if (leapcnt >= TZ_MAX_LEAPS) {
1517 error("too many leap seconds");
1518 (void) exit(EXIT_FAILURE);
1519 }
1520 for (i = 0; i < leapcnt; ++i)
1521 if (t <= trans[i]) {
1522 if (t == trans[i]) {
1523 error("repeated leap second moment");
1524 (void) exit(EXIT_FAILURE);
1525 }
1526 break;
1527 }
1528 for (j = leapcnt; j > i; --j) {
1529 trans[j] = trans[j-1];
1530 corr[j] = corr[j-1];
1531 roll[j] = roll[j-1];
1532 }
1533 trans[i] = t;
1534 corr[i] = (positive ? 1L : -1L);
1535 roll[i] = rolling;
1536 ++leapcnt;
1537 }
1538
1539 static void
adjleap()1540 adjleap()
1541 {
1542 register int i;
1543 register long last = 0;
1544
1545 /*
1546 ** propagate leap seconds forward
1547 */
1548 for (i = 0; i < leapcnt; ++i) {
1549 trans[i] = tadd(trans[i], last);
1550 last = corr[i] += last;
1551 }
1552 }
1553
1554 static int
yearistype(year,type)1555 yearistype(year, type)
1556 const int year;
1557 const char * const type;
1558 {
1559 char buf[BUFSIZ];
1560 int result;
1561
1562 if (type == NULL || *type == '\0')
1563 return TRUE;
1564 if (strcmp(type, "uspres") == 0)
1565 return (year % 4) == 0;
1566 if (strcmp(type, "nonpres") == 0)
1567 return (year % 4) != 0;
1568 (void) sprintf(buf, "yearistype %d %s", year, type);
1569 result = system(buf);
1570 if (result == 0)
1571 return TRUE;
1572 if (result == (1 << 8))
1573 return FALSE;
1574 error("Wild result from command execution");
1575 (void) fprintf(stderr, "%s: command was '%s', result was %d\n",
1576 progname, buf, result);
1577 for ( ; ; )
1578 (void) exit(EXIT_FAILURE);
1579 }
1580
1581 static int
lowerit(a)1582 lowerit(a)
1583 const int a;
1584 {
1585 return (isascii(a) && isupper(a)) ? tolower(a) : a;
1586 }
1587
1588 static int
ciequal(ap,bp)1589 ciequal(ap, bp) /* case-insensitive equality */
1590 register const char * ap;
1591 register const char * bp;
1592 {
1593 while (lowerit(*ap) == lowerit(*bp++))
1594 if (*ap++ == '\0')
1595 return TRUE;
1596 return FALSE;
1597 }
1598
1599 static int
itsabbr(abbr,word)1600 itsabbr(abbr, word)
1601 register const char * abbr;
1602 register const char * word;
1603 {
1604 if (lowerit(*abbr) != lowerit(*word))
1605 return FALSE;
1606 ++word;
1607 while (*++abbr != '\0')
1608 do if (*word == '\0')
1609 return FALSE;
1610 while (lowerit(*word++) != lowerit(*abbr));
1611 return TRUE;
1612 }
1613
1614 static const struct lookup *
byword(word,table)1615 byword(word, table)
1616 register const char * const word;
1617 register const struct lookup * const table;
1618 {
1619 register const struct lookup * foundlp;
1620 register const struct lookup * lp;
1621
1622 if (word == NULL || table == NULL)
1623 return NULL;
1624 /*
1625 ** Look for exact match.
1626 */
1627 for (lp = table; lp->l_word != NULL; ++lp)
1628 if (ciequal(word, lp->l_word))
1629 return lp;
1630 /*
1631 ** Look for inexact match.
1632 */
1633 foundlp = NULL;
1634 for (lp = table; lp->l_word != NULL; ++lp)
1635 if (itsabbr(word, lp->l_word))
1636 if (foundlp == NULL)
1637 foundlp = lp;
1638 else return NULL; /* multiple inexact matches */
1639 return foundlp;
1640 }
1641
1642 static char **
getfields(cp)1643 getfields(cp)
1644 register char * cp;
1645 {
1646 register char * dp;
1647 register char ** array;
1648 register int nsubs;
1649
1650 if (cp == NULL)
1651 return NULL;
1652 array = (char **) emalloc((int) ((strlen(cp) + 1) * sizeof *array));
1653 nsubs = 0;
1654 for ( ; ; ) {
1655 while (isascii(*cp) && isspace(*cp))
1656 ++cp;
1657 if (*cp == '\0' || *cp == '#')
1658 break;
1659 array[nsubs++] = dp = cp;
1660 do {
1661 if ((*dp = *cp++) != '"')
1662 ++dp;
1663 else while ((*dp = *cp++) != '"')
1664 if (*dp != '\0')
1665 ++dp;
1666 else error("Odd number of quotation marks");
1667 } while (*cp != '\0' && *cp != '#' &&
1668 (!isascii(*cp) || !isspace(*cp)));
1669 if (isascii(*cp) && isspace(*cp))
1670 ++cp;
1671 *dp = '\0';
1672 }
1673 array[nsubs] = NULL;
1674 return array;
1675 }
1676
1677 static long
oadd(t1,t2)1678 oadd(t1, t2)
1679 const long t1;
1680 const long t2;
1681 {
1682 register long t;
1683
1684 t = t1 + t2;
1685 if (t2 > 0 && t <= t1 || t2 < 0 && t >= t1) {
1686 error("time overflow");
1687 (void) exit(EXIT_FAILURE);
1688 }
1689 return t;
1690 }
1691
1692 static time_t
tadd(t1,t2)1693 tadd(t1, t2)
1694 const time_t t1;
1695 const long t2;
1696 {
1697 register time_t t;
1698
1699 if (t1 == max_time && t2 > 0)
1700 return max_time;
1701 if (t1 == min_time && t2 < 0)
1702 return min_time;
1703 t = t1 + t2;
1704 if (t2 > 0 && t <= t1 || t2 < 0 && t >= t1) {
1705 error("time overflow");
1706 (void) exit(EXIT_FAILURE);
1707 }
1708 return t;
1709 }
1710
1711 /*
1712 ** Given a rule, and a year, compute the date - in seconds since January 1,
1713 ** 1970, 00:00 LOCAL time - in that year that the rule refers to.
1714 */
1715
1716 static time_t
rpytime(rp,wantedy)1717 rpytime(rp, wantedy)
1718 register const struct rule * const rp;
1719 register const int wantedy;
1720 {
1721 register int y, m, i;
1722 register long dayoff; /* with a nod to Margaret O. */
1723 register time_t t;
1724
1725 dayoff = 0;
1726 m = TM_JANUARY;
1727 y = EPOCH_YEAR;
1728 while (wantedy != y) {
1729 if (wantedy > y) {
1730 i = len_years[isleap(y)];
1731 ++y;
1732 } else {
1733 --y;
1734 i = -len_years[isleap(y)];
1735 }
1736 dayoff = oadd(dayoff, eitol(i));
1737 }
1738 while (m != rp->r_month) {
1739 i = len_months[isleap(y)][m];
1740 dayoff = oadd(dayoff, eitol(i));
1741 ++m;
1742 }
1743 i = rp->r_dayofmonth;
1744 if (m == TM_FEBRUARY && i == 29 && !isleap(y)) {
1745 if (rp->r_dycode == DC_DOWLEQ)
1746 --i;
1747 else {
1748 error("use of 2/29 in non leap-year");
1749 (void) exit(EXIT_FAILURE);
1750 }
1751 }
1752 --i;
1753 dayoff = oadd(dayoff, eitol(i));
1754 if (rp->r_dycode == DC_DOWGEQ || rp->r_dycode == DC_DOWLEQ) {
1755 register long wday;
1756
1757 #define LDAYSPERWEEK ((long) DAYSPERWEEK)
1758 wday = eitol(EPOCH_WDAY);
1759 /*
1760 ** Don't trust mod of negative numbers.
1761 */
1762 if (dayoff >= 0)
1763 wday = (wday + dayoff) % LDAYSPERWEEK;
1764 else {
1765 wday -= ((-dayoff) % LDAYSPERWEEK);
1766 if (wday < 0)
1767 wday += LDAYSPERWEEK;
1768 }
1769 while (wday != eitol(rp->r_wday))
1770 if (rp->r_dycode == DC_DOWGEQ) {
1771 dayoff = oadd(dayoff, (long) 1);
1772 if (++wday >= LDAYSPERWEEK)
1773 wday = 0;
1774 ++i;
1775 } else {
1776 dayoff = oadd(dayoff, (long) -1);
1777 if (--wday < 0)
1778 wday = LDAYSPERWEEK - 1;
1779 --i;
1780 }
1781 if (i < 0 || i >= len_months[isleap(y)][m]) {
1782 error("no day in month matches rule");
1783 (void) exit(EXIT_FAILURE);
1784 }
1785 }
1786 if (dayoff < 0 && !tt_signed) {
1787 if (wantedy == rp->r_loyear)
1788 return min_time;
1789 error("time before zero");
1790 (void) exit(EXIT_FAILURE);
1791 }
1792 t = (time_t) dayoff * SECSPERDAY;
1793 /*
1794 ** Cheap overflow check.
1795 */
1796 if (t / SECSPERDAY != dayoff) {
1797 if (wantedy == rp->r_hiyear)
1798 return max_time;
1799 if (wantedy == rp->r_loyear)
1800 return min_time;
1801 error("time overflow");
1802 (void) exit(EXIT_FAILURE);
1803 }
1804 return tadd(t, rp->r_tod);
1805 }
1806
1807 static void
newabbr(string)1808 newabbr(string)
1809 const char * const string;
1810 {
1811 register int i;
1812
1813 i = strlen(string) + 1;
1814 if (charcnt + i >= TZ_MAX_CHARS) {
1815 error("too many, or too long, time zone abbreviations");
1816 (void) exit(EXIT_FAILURE);
1817 }
1818 (void) strcpy(&chars[charcnt], string);
1819 charcnt += eitol(i);
1820 }
1821
1822 static int
mkdirs(name)1823 mkdirs(name)
1824 char * const name;
1825 {
1826 register char * cp;
1827
1828 if ((cp = name) == NULL || *cp == '\0')
1829 return 0;
1830 while ((cp = strchr(cp + 1, '/')) != 0) {
1831 *cp = '\0';
1832 if (!itsdir(name)) {
1833 /*
1834 ** It doesn't seem to exist, so we try to create it.
1835 */
1836 if (mkdir(name, 0755) != 0) {
1837 (void) fprintf(stderr,
1838 "%s: Can't create directory ",
1839 progname);
1840 (void) perror(name);
1841 return -1;
1842 }
1843 }
1844 *cp = '/';
1845 }
1846 return 0;
1847 }
1848
1849 static long
eitol(i)1850 eitol(i)
1851 const int i;
1852 {
1853 long l;
1854
1855 l = i;
1856 if (i < 0 && l >= 0 || i == 0 && l != 0 || i > 0 && l <= 0) {
1857 (void) fprintf(stderr, "%s: %d did not sign extend correctly\n",
1858 progname, i);
1859 (void) exit(EXIT_FAILURE);
1860 }
1861 return l;
1862 }
1863
1864 /*
1865 ** UNIX is a registered trademark of AT&T.
1866 */
1867