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Wed Aug 9 14:25:35 1995 Miles Bader <miles@geech.gnu.ai.mit.edu>
[glibc.git] / time / zic.c
blobfc1a16bff93725cdb40817355317eff4cdd2dd09
1 #ifndef lint
2 #ifndef NOID
3 static char elsieid[] = "@(#)zic.c 7.50";
4 #endif /* !defined NOID */
5 #endif /* !defined lint */
6
7 #include "private.h"
8 #include "tzfile.h"
9 #ifdef unix
10 #include "sys/stat.h" /* for umask manifest constants */
11 #endif /* defined unix */
12
13 struct rule {
14 const char * r_filename;
15 int r_linenum;
16 const char * r_name;
17
18 int r_loyear; /* for example, 1986 */
19 int r_hiyear; /* for example, 1986 */
20 const char * r_yrtype;
21
22 int r_month; /* 0..11 */
23
24 int r_dycode; /* see below */
25 int r_dayofmonth;
26 int r_wday;
27
28 long r_tod; /* time from midnight */
29 int r_todisstd; /* above is standard time if TRUE */
30 /* or wall clock time if FALSE */
31 int r_todisgmt; /* above is GMT if TRUE */
32 /* or local time if FALSE */
33 long r_stdoff; /* offset from standard time */
34 const char * r_abbrvar; /* variable part of abbreviation */
35
36 int r_todo; /* a rule to do (used in outzone) */
37 time_t r_temp; /* used in outzone */
38 };
39
40 /*
41 ** r_dycode r_dayofmonth r_wday
42 */
43
44 #define DC_DOM 0 /* 1..31 */ /* unused */
45 #define DC_DOWGEQ 1 /* 1..31 */ /* 0..6 (Sun..Sat) */
46 #define DC_DOWLEQ 2 /* 1..31 */ /* 0..6 (Sun..Sat) */
47
48 struct zone {
49 const char * z_filename;
50 int z_linenum;
51
52 const char * z_name;
53 long z_gmtoff;
54 const char * z_rule;
55 const char * z_format;
56
57 long z_stdoff;
58
59 struct rule * z_rules;
60 int z_nrules;
61
62 struct rule z_untilrule;
63 time_t z_untiltime;
64 };
65
66 extern int getopt P((int argc, char * const argv[],
67 const char * options));
68 extern char * icatalloc P((char * old, const char * new));
69 extern char * icpyalloc P((const char * string));
70 extern void ifree P((char * p));
71 extern char * imalloc P((int n));
72 extern void * irealloc P((void * old, int n));
73 extern int link P((const char * fromname, const char * toname));
74 extern char * optarg;
75 extern int optind;
76 extern char * scheck P((const char * string, const char * format));
77
78 static void addtt P((time_t starttime, int type));
79 static int addtype P((long gmtoff, const char * abbr, int isdst,
80 int ttisstd, int ttisgmt));
81 static void leapadd P((time_t t, int positive, int rolling, int count));
82 static void adjleap P((void));
83 static void associate P((void));
84 static int ciequal P((const char * ap, const char * bp));
85 static void convert P((long val, char * buf));
86 static void dolink P((const char * fromfile, const char * tofile));
87 static void doabbr P((char * abbr, const char * format,
88 const char * letters, int isdst));
89 static void eat P((const char * name, int num));
90 static void eats P((const char * name, int num,
91 const char * rname, int rnum));
92 static long eitol P((int i));
93 static void error P((const char * message));
94 static char ** getfields P((char * buf));
95 static long gethms P((const char * string, const char * errstrng,
96 int signable));
97 static void infile P((const char * filename));
98 static void inleap P((char ** fields, int nfields));
99 static void inlink P((char ** fields, int nfields));
100 static void inrule P((char ** fields, int nfields));
101 static int inzcont P((char ** fields, int nfields));
102 static int inzone P((char ** fields, int nfields));
103 static int inzsub P((char ** fields, int nfields, int iscont));
104 static int itsabbr P((const char * abbr, const char * word));
105 static int itsdir P((const char * name));
106 static int lowerit P((int c));
107 static char * memcheck P((char * tocheck));
108 static int mkdirs P((char * filename));
109 static void newabbr P((const char * abbr));
110 static long oadd P((long t1, long t2));
111 static void outzone P((const struct zone * zp, int ntzones));
112 static void puttzcode P((long code, FILE * fp));
113 static int rcomp P((const void * leftp, const void * rightp));
114 static time_t rpytime P((const struct rule * rp, int wantedy));
115 static void rulesub P((struct rule * rp,
116 const char * loyearp, const char * hiyearp,
117 const char * typep, const char * monthp,
118 const char * dayp, const char * timep));
119 static void setboundaries P((void));
120 static time_t tadd P((time_t t1, long t2));
121 static void usage P((void));
122 static void writezone P((const char * name));
123 static int yearistype P((int year, const char * type));
124
125 static int charcnt;
126 static int errors;
127 static const char * filename;
128 static int leapcnt;
129 static int linenum;
130 static int max_int;
131 static time_t max_time;
132 static int max_year;
133 static int min_int;
134 static time_t min_time;
135 static int min_year;
136 static int noise;
137 static const char * rfilename;
138 static int rlinenum;
139 static const char * progname;
140 static int timecnt;
141 static int typecnt;
142 static int tt_signed;
143
144 /*
145 ** Line codes.
146 */
147
148 #define LC_RULE 0
149 #define LC_ZONE 1
150 #define LC_LINK 2
151 #define LC_LEAP 3
152
153 /*
154 ** Which fields are which on a Zone line.
155 */
156
157 #define ZF_NAME 1
158 #define ZF_GMTOFF 2
159 #define ZF_RULE 3
160 #define ZF_FORMAT 4
161 #define ZF_TILYEAR 5
162 #define ZF_TILMONTH 6
163 #define ZF_TILDAY 7
164 #define ZF_TILTIME 8
165 #define ZONE_MINFIELDS 5
166 #define ZONE_MAXFIELDS 9
167
168 /*
169 ** Which fields are which on a Zone continuation line.
170 */
171
172 #define ZFC_GMTOFF 0
173 #define ZFC_RULE 1
174 #define ZFC_FORMAT 2
175 #define ZFC_TILYEAR 3
176 #define ZFC_TILMONTH 4
177 #define ZFC_TILDAY 5
178 #define ZFC_TILTIME 6
179 #define ZONEC_MINFIELDS 3
180 #define ZONEC_MAXFIELDS 7
181
182 /*
183 ** Which files are which on a Rule line.
184 */
185
186 #define RF_NAME 1
187 #define RF_LOYEAR 2
188 #define RF_HIYEAR 3
189 #define RF_COMMAND 4
190 #define RF_MONTH 5
191 #define RF_DAY 6
192 #define RF_TOD 7
193 #define RF_STDOFF 8
194 #define RF_ABBRVAR 9
195 #define RULE_FIELDS 10
196
197 /*
198 ** Which fields are which on a Link line.
199 */
200
201 #define LF_FROM 1
202 #define LF_TO 2
203 #define LINK_FIELDS 3
204
205 /*
206 ** Which fields are which on a Leap line.
207 */
208
209 #define LP_YEAR 1
210 #define LP_MONTH 2
211 #define LP_DAY 3
212 #define LP_TIME 4
213 #define LP_CORR 5
214 #define LP_ROLL 6
215 #define LEAP_FIELDS 7
216
217 /*
218 ** Year synonyms.
219 */
220
221 #define YR_MINIMUM 0
222 #define YR_MAXIMUM 1
223 #define YR_ONLY 2
224
225 static struct rule * rules;
226 static int nrules; /* number of rules */
227
228 static struct zone * zones;
229 static int nzones; /* number of zones */
230
231 struct link {
232 const char * l_filename;
233 int l_linenum;
234 const char * l_from;
235 const char * l_to;
236 };
237
238 static struct link * links;
239 static int nlinks;
240
241 struct lookup {
242 const char * l_word;
243 const int l_value;
244 };
245
246 static struct lookup const * byword P((const char * string,
247 const struct lookup * lp));
248
249 static struct lookup const line_codes[] = {
250 { "Rule", LC_RULE },
251 { "Zone", LC_ZONE },
252 { "Link", LC_LINK },
253 { "Leap", LC_LEAP },
254 { NULL, 0}
255 };
256
257 static struct lookup const mon_names[] = {
258 { "January", TM_JANUARY },
259 { "February", TM_FEBRUARY },
260 { "March", TM_MARCH },
261 { "April", TM_APRIL },
262 { "May", TM_MAY },
263 { "June", TM_JUNE },
264 { "July", TM_JULY },
265 { "August", TM_AUGUST },
266 { "September", TM_SEPTEMBER },
267 { "October", TM_OCTOBER },
268 { "November", TM_NOVEMBER },
269 { "December", TM_DECEMBER },
270 { NULL, 0 }
271 };
272
273 static struct lookup const wday_names[] = {
274 { "Sunday", TM_SUNDAY },
275 { "Monday", TM_MONDAY },
276 { "Tuesday", TM_TUESDAY },
277 { "Wednesday", TM_WEDNESDAY },
278 { "Thursday", TM_THURSDAY },
279 { "Friday", TM_FRIDAY },
280 { "Saturday", TM_SATURDAY },
281 { NULL, 0 }
282 };
283
284 static struct lookup const lasts[] = {
285 { "last-Sunday", TM_SUNDAY },
286 { "last-Monday", TM_MONDAY },
287 { "last-Tuesday", TM_TUESDAY },
288 { "last-Wednesday", TM_WEDNESDAY },
289 { "last-Thursday", TM_THURSDAY },
290 { "last-Friday", TM_FRIDAY },
291 { "last-Saturday", TM_SATURDAY },
292 { NULL, 0 }
293 };
294
295 static struct lookup const begin_years[] = {
296 { "minimum", YR_MINIMUM },
297 { "maximum", YR_MAXIMUM },
298 { NULL, 0 }
299 };
300
301 static struct lookup const end_years[] = {
302 { "minimum", YR_MINIMUM },
303 { "maximum", YR_MAXIMUM },
304 { "only", YR_ONLY },
305 { NULL, 0 }
306 };
307
308 static struct lookup const leap_types[] = {
309 { "Rolling", TRUE },
310 { "Stationary", FALSE },
311 { NULL, 0 }
312 };
313
314 static const int len_months[2][MONSPERYEAR] = {
315 { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
316 { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
317 };
318
319 static const int len_years[2] = {
320 DAYSPERNYEAR, DAYSPERLYEAR
321 };
322
323 static time_t ats[TZ_MAX_TIMES];
324 static unsigned char types[TZ_MAX_TIMES];
325 static long gmtoffs[TZ_MAX_TYPES];
326 static char isdsts[TZ_MAX_TYPES];
327 static unsigned char abbrinds[TZ_MAX_TYPES];
328 static char ttisstds[TZ_MAX_TYPES];
329 static char ttisgmts[TZ_MAX_TYPES];
330 static char chars[TZ_MAX_CHARS];
331 static time_t trans[TZ_MAX_LEAPS];
332 static long corr[TZ_MAX_LEAPS];
333 static char roll[TZ_MAX_LEAPS];
334
335 /*
336 ** Memory allocation.
337 */
338
339 static char *
340 memcheck(ptr)
341 char * const ptr;
342 {
343 if (ptr == NULL) {
344 (void) perror(progname);
345 (void) exit(EXIT_FAILURE);
346 }
347 return ptr;
348 }
349
350 #define emalloc(size) memcheck(imalloc(size))
351 #define erealloc(ptr, size) memcheck(irealloc((ptr), (size)))
352 #define ecpyalloc(ptr) memcheck(icpyalloc(ptr))
353 #define ecatalloc(oldp, newp) memcheck(icatalloc((oldp), (newp)))
354
355 /*
356 ** Error handling.
357 */
358
359 static void
360 eats(name, num, rname, rnum)
361 const char * const name;
362 const int num;
363 const char * const rname;
364 const int rnum;
365 {
366 filename = name;
367 linenum = num;
368 rfilename = rname;
369 rlinenum = rnum;
370 }
371
372 static void
373 eat(name, num)
374 const char * const name;
375 const int num;
376 {
377 eats(name, num, (char *) NULL, -1);
378 }
379
380 static void
381 error(string)
382 const char * const string;
383 {
384 /*
385 ** Match the format of "cc" to allow sh users to
386 ** zic ... 2>&1 | error -t "*" -v
387 ** on BSD systems.
388 */
389 (void) fprintf(stderr, "\"%s\", line %d: %s",
390 filename, linenum, string);
391 if (rfilename != NULL)
392 (void) fprintf(stderr, " (rule from \"%s\", line %d)",
393 rfilename, rlinenum);
394 (void) fprintf(stderr, "\n");
395 ++errors;
396 }
397
398 static void
399 usage P((void))
400 {
401 (void) fprintf(stderr, "%s: usage is %s \
402 [ -s ] [ -v ] [ -l localtime ] [ -p posixrules ] [ -d directory ]\n\
403 \t[ -L leapseconds ] [ -y yearistype ] [ filename ... ]\n",
404 progname, progname);
405 (void) exit(EXIT_FAILURE);
406 }
407
408 static const char * psxrules;
409 static const char * lcltime;
410 static const char * directory;
411 static const char * leapsec;
412 static const char * yitcommand;
413 static int sflag = FALSE;
414
415 int
416 main(argc, argv)
417 int argc;
418 char * argv[];
419 {
420 register int i;
421 register int j;
422 register int c;
423
424 #ifdef unix
425 (void) umask(umask(S_IWGRP | S_IWOTH) | (S_IWGRP | S_IWOTH));
426 #endif /* defined unix */
427 progname = argv[0];
428 while ((c = getopt(argc, argv, "d:l:p:L:vsy:")) != EOF)
429 switch (c) {
430 default:
431 usage();
432 case 'd':
433 if (directory == NULL)
434 directory = optarg;
435 else {
436 (void) fprintf(stderr,
437 "%s: More than one -d option specified\n",
438 progname);
439 (void) exit(EXIT_FAILURE);
440 }
441 break;
442 case 'l':
443 if (lcltime == NULL)
444 lcltime = optarg;
445 else {
446 (void) fprintf(stderr,
447 "%s: More than one -l option specified\n",
448 progname);
449 (void) exit(EXIT_FAILURE);
450 }
451 break;
452 case 'p':
453 if (psxrules == NULL)
454 psxrules = optarg;
455 else {
456 (void) fprintf(stderr,
457 "%s: More than one -p option specified\n",
458 progname);
459 (void) exit(EXIT_FAILURE);
460 }
461 break;
462 case 'y':
463 if (yitcommand == NULL)
464 yitcommand = optarg;
465 else {
466 (void) fprintf(stderr,
467 "%s: More than one -y option specified\n",
468 progname);
469 (void) exit(EXIT_FAILURE);
470 }
471 break;
472 case 'L':
473 if (leapsec == NULL)
474 leapsec = optarg;
475 else {
476 (void) fprintf(stderr,
477 "%s: More than one -L option specified\n",
478 progname);
479 (void) exit(EXIT_FAILURE);
480 }
481 break;
482 case 'v':
483 noise = TRUE;
484 break;
485 case 's':
486 sflag = TRUE;
487 break;
488 }
489 if (optind == argc - 1 && strcmp(argv[optind], "=") == 0)
490 usage(); /* usage message by request */
491 if (directory == NULL)
492 directory = TZDIR;
493 if (yitcommand == NULL)
494 yitcommand = "yearistype";
495
496 setboundaries();
497
498 if (optind < argc && leapsec != NULL) {
499 infile(leapsec);
500 adjleap();
501 }
502
503 for (i = optind; i < argc; ++i)
504 infile(argv[i]);
505 if (errors)
506 (void) exit(EXIT_FAILURE);
507 associate();
508 for (i = 0; i < nzones; i = j) {
509 /*
510 ** Find the next non-continuation zone entry.
511 */
512 for (j = i + 1; j < nzones && zones[j].z_name == NULL; ++j)
513 continue;
514 outzone(&zones[i], j - i);
515 }
516 /*
517 ** Make links.
518 */
519 for (i = 0; i < nlinks; ++i)
520 dolink(links[i].l_from, links[i].l_to);
521 if (lcltime != NULL)
522 dolink(lcltime, TZDEFAULT);
523 if (psxrules != NULL)
524 dolink(psxrules, TZDEFRULES);
525 return (errors == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
526 }
527
528 static void
529 dolink(fromfile, tofile)
530 const char * const fromfile;
531 const char * const tofile;
532 {
533 register char * fromname;
534 register char * toname;
535
536 if (fromfile[0] == '/')
537 fromname = ecpyalloc(fromfile);
538 else {
539 fromname = ecpyalloc(directory);
540 fromname = ecatalloc(fromname, "/");
541 fromname = ecatalloc(fromname, fromfile);
542 }
543 if (tofile[0] == '/')
544 toname = ecpyalloc(tofile);
545 else {
546 toname = ecpyalloc(directory);
547 toname = ecatalloc(toname, "/");
548 toname = ecatalloc(toname, tofile);
549 }
550 /*
551 ** We get to be careful here since
552 ** there's a fair chance of root running us.
553 */
554 if (!itsdir(toname))
555 (void) remove(toname);
556 if (link(fromname, toname) != 0) {
557 if (mkdirs(toname) != 0)
558 (void) exit(EXIT_FAILURE);
559 if (link(fromname, toname) != 0) {
560 (void) fprintf(stderr, "%s: Can't link from %s to ",
561 progname, fromname);
562 (void) perror(toname);
563 (void) exit(EXIT_FAILURE);
564 }
565 }
566 ifree(fromname);
567 ifree(toname);
568 }
569
570 static void
571 setboundaries P((void))
572 {
573 register time_t bit;
574 register int bii;
575
576 for (bit = 1; bit > 0; bit <<= 1)
577 continue;
578 if (bit == 0) { /* time_t is an unsigned type */
579 tt_signed = FALSE;
580 min_time = 0;
581 max_time = ~(time_t) 0;
582 if (sflag)
583 max_time >>= 1;
584 } else {
585 tt_signed = TRUE;
586 min_time = bit;
587 max_time = bit;
588 ++max_time;
589 max_time = -max_time;
590 if (sflag)
591 min_time = 0;
592 }
593 min_year = TM_YEAR_BASE + gmtime(&min_time)->tm_year;
594 max_year = TM_YEAR_BASE + gmtime(&max_time)->tm_year;
595
596 for (bii = 1; bii > 0; bii <<= 1)
597 continue;
598 min_int = bii;
599 max_int = -1 - bii;
600 }
601
602 static int
603 itsdir(name)
604 const char * const name;
605 {
606 register char * myname;
607 register int accres;
608
609 myname = ecpyalloc(name);
610 myname = ecatalloc(myname, "/.");
611 accres = access(myname, F_OK);
612 ifree(myname);
613 return accres == 0;
614 }
615
616 /*
617 ** Associate sets of rules with zones.
618 */
619
620 /*
621 ** Sort by rule name.
622 */
623
624 static int
625 rcomp(cp1, cp2)
626 const void * cp1;
627 const void * cp2;
628 {
629 return strcmp(((const struct rule *) cp1)->r_name,
630 ((const struct rule *) cp2)->r_name);
631 }
632
633 static void
634 associate P((void))
635 {
636 register struct zone * zp;
637 register struct rule * rp;
638 register int base, out;
639 register int i;
640
641 if (nrules != 0)
642 (void) qsort((void *) rules, (size_t) nrules,
643 (size_t) sizeof *rules, rcomp);
644 for (i = 0; i < nzones; ++i) {
645 zp = &zones[i];
646 zp->z_rules = NULL;
647 zp->z_nrules = 0;
648 }
649 for (base = 0; base < nrules; base = out) {
650 rp = &rules[base];
651 for (out = base + 1; out < nrules; ++out)
652 if (strcmp(rp->r_name, rules[out].r_name) != 0)
653 break;
654 for (i = 0; i < nzones; ++i) {
655 zp = &zones[i];
656 if (strcmp(zp->z_rule, rp->r_name) != 0)
657 continue;
658 zp->z_rules = rp;
659 zp->z_nrules = out - base;
660 }
661 }
662 for (i = 0; i < nzones; ++i) {
663 zp = &zones[i];
664 if (zp->z_nrules == 0) {
665 /*
666 ** Maybe we have a local standard time offset.
667 */
668 eat(zp->z_filename, zp->z_linenum);
669 zp->z_stdoff = gethms(zp->z_rule, "unruly zone", TRUE);
670 /*
671 ** Note, though, that if there's no rule,
672 ** a '%s' in the format is a bad thing.
673 */
674 if (strchr(zp->z_format, '%') != 0)
675 error("%s in ruleless zone");
676 }
677 }
678 if (errors)
679 (void) exit(EXIT_FAILURE);
680 }
681
682 static void
683 infile(name)
684 const char * name;
685 {
686 register FILE * fp;
687 register char ** fields;
688 register char * cp;
689 register const struct lookup * lp;
690 register int nfields;
691 register int wantcont;
692 register int num;
693 char buf[BUFSIZ];
694
695 if (strcmp(name, "-") == 0) {
696 name = "standard input";
697 fp = stdin;
698 } else if ((fp = fopen(name, "r")) == NULL) {
699 (void) fprintf(stderr, "%s: Can't open ", progname);
700 (void) perror(name);
701 (void) exit(EXIT_FAILURE);
702 }
703 wantcont = FALSE;
704 for (num = 1; ; ++num) {
705 eat(name, num);
706 if (fgets(buf, (int) sizeof buf, fp) != buf)
707 break;
708 cp = strchr(buf, '\n');
709 if (cp == NULL) {
710 error("line too long");
711 (void) exit(EXIT_FAILURE);
712 }
713 *cp = '\0';
714 fields = getfields(buf);
715 nfields = 0;
716 while (fields[nfields] != NULL) {
717 static char nada;
718
719 if (ciequal(fields[nfields], "-"))
720 fields[nfields] = &nada;
721 ++nfields;
722 }
723 if (nfields == 0) {
724 /* nothing to do */
725 } else if (wantcont) {
726 wantcont = inzcont(fields, nfields);
727 } else {
728 lp = byword(fields[0], line_codes);
729 if (lp == NULL)
730 error("input line of unknown type");
731 else switch ((int) (lp->l_value)) {
732 case LC_RULE:
733 inrule(fields, nfields);
734 wantcont = FALSE;
735 break;
736 case LC_ZONE:
737 wantcont = inzone(fields, nfields);
738 break;
739 case LC_LINK:
740 inlink(fields, nfields);
741 wantcont = FALSE;
742 break;
743 case LC_LEAP:
744 if (name != leapsec)
745 (void) fprintf(stderr,
746 "%s: Leap line in non leap seconds file %s\n",
747 progname, name);
748 else inleap(fields, nfields);
749 wantcont = FALSE;
750 break;
751 default: /* "cannot happen" */
752 (void) fprintf(stderr,
753 "%s: panic: Invalid l_value %d\n",
754 progname, lp->l_value);
755 (void) exit(EXIT_FAILURE);
756 }
757 }
758 ifree((char *) fields);
759 }
760 if (ferror(fp)) {
761 (void) fprintf(stderr, "%s: Error reading ", progname);
762 (void) perror(filename);
763 (void) exit(EXIT_FAILURE);
764 }
765 if (fp != stdin && fclose(fp)) {
766 (void) fprintf(stderr, "%s: Error closing ", progname);
767 (void) perror(filename);
768 (void) exit(EXIT_FAILURE);
769 }
770 if (wantcont)
771 error("expected continuation line not found");
772 }
773
774 /*
775 ** Convert a string of one of the forms
776 ** h -h hh:mm -hh:mm hh:mm:ss -hh:mm:ss
777 ** into a number of seconds.
778 ** A null string maps to zero.
779 ** Call error with errstring and return zero on errors.
780 */
781
782 static long
783 gethms(string, errstring, signable)
784 const char * string;
785 const char * const errstring;
786 const int signable;
787 {
788 int hh, mm, ss, sign;
789
790 if (string == NULL || *string == '\0')
791 return 0;
792 if (!signable)
793 sign = 1;
794 else if (*string == '-') {
795 sign = -1;
796 ++string;
797 } else sign = 1;
798 if (sscanf(string, scheck(string, "%d"), &hh) == 1)
799 mm = ss = 0;
800 else if (sscanf(string, scheck(string, "%d:%d"), &hh, &mm) == 2)
801 ss = 0;
802 else if (sscanf(string, scheck(string, "%d:%d:%d"),
803 &hh, &mm, &ss) != 3) {
804 error(errstring);
805 return 0;
806 }
807 if (hh < 0 || hh >= HOURSPERDAY ||
808 mm < 0 || mm >= MINSPERHOUR ||
809 ss < 0 || ss > SECSPERMIN) {
810 error(errstring);
811 return 0;
812 }
813 return eitol(sign) *
814 (eitol(hh * MINSPERHOUR + mm) *
815 eitol(SECSPERMIN) + eitol(ss));
816 }
817
818 static void
819 inrule(fields, nfields)
820 register char ** const fields;
821 const int nfields;
822 {
823 static struct rule r;
824
825 if (nfields != RULE_FIELDS) {
826 error("wrong number of fields on Rule line");
827 return;
828 }
829 if (*fields[RF_NAME] == '\0') {
830 error("nameless rule");
831 return;
832 }
833 r.r_filename = filename;
834 r.r_linenum = linenum;
835 r.r_stdoff = gethms(fields[RF_STDOFF], "invalid saved time", TRUE);
836 rulesub(&r, fields[RF_LOYEAR], fields[RF_HIYEAR], fields[RF_COMMAND],
837 fields[RF_MONTH], fields[RF_DAY], fields[RF_TOD]);
838 r.r_name = ecpyalloc(fields[RF_NAME]);
839 r.r_abbrvar = ecpyalloc(fields[RF_ABBRVAR]);
840 rules = (struct rule *) (void *) erealloc((char *) rules,
841 (int) ((nrules + 1) * sizeof *rules));
842 rules[nrules++] = r;
843 }
844
845 static int
846 inzone(fields, nfields)
847 register char ** const fields;
848 const int nfields;
849 {
850 register int i;
851 static char * buf;
852
853 if (nfields < ZONE_MINFIELDS || nfields > ZONE_MAXFIELDS) {
854 error("wrong number of fields on Zone line");
855 return FALSE;
856 }
857 if (strcmp(fields[ZF_NAME], TZDEFAULT) == 0 && lcltime != NULL) {
858 buf = erealloc(buf, (int) (132 + strlen(TZDEFAULT)));
859 (void) sprintf(buf,
860 "\"Zone %s\" line and -l option are mutually exclusive",
861 TZDEFAULT);
862 error(buf);
863 return FALSE;
864 }
865 if (strcmp(fields[ZF_NAME], TZDEFRULES) == 0 && psxrules != NULL) {
866 buf = erealloc(buf, (int) (132 + strlen(TZDEFRULES)));
867 (void) sprintf(buf,
868 "\"Zone %s\" line and -p option are mutually exclusive",
869 TZDEFRULES);
870 error(buf);
871 return FALSE;
872 }
873 for (i = 0; i < nzones; ++i)
874 if (zones[i].z_name != NULL &&
875 strcmp(zones[i].z_name, fields[ZF_NAME]) == 0) {
876 buf = erealloc(buf, (int) (132 +
877 strlen(fields[ZF_NAME]) +
878 strlen(zones[i].z_filename)));
879 (void) sprintf(buf,
880 "duplicate zone name %s (file \"%s\", line %d)",
881 fields[ZF_NAME],
882 zones[i].z_filename,
883 zones[i].z_linenum);
884 error(buf);
885 return FALSE;
886 }
887 return inzsub(fields, nfields, FALSE);
888 }
889
890 static int
891 inzcont(fields, nfields)
892 register char ** const fields;
893 const int nfields;
894 {
895 if (nfields < ZONEC_MINFIELDS || nfields > ZONEC_MAXFIELDS) {
896 error("wrong number of fields on Zone continuation line");
897 return FALSE;
898 }
899 return inzsub(fields, nfields, TRUE);
900 }
901
902 static int
903 inzsub(fields, nfields, iscont)
904 register char ** const fields;
905 const int nfields;
906 const int iscont;
907 {
908 register char * cp;
909 static struct zone z;
910 register int i_gmtoff, i_rule, i_format;
911 register int i_untilyear, i_untilmonth;
912 register int i_untilday, i_untiltime;
913 register int hasuntil;
914
915 if (iscont) {
916 i_gmtoff = ZFC_GMTOFF;
917 i_rule = ZFC_RULE;
918 i_format = ZFC_FORMAT;
919 i_untilyear = ZFC_TILYEAR;
920 i_untilmonth = ZFC_TILMONTH;
921 i_untilday = ZFC_TILDAY;
922 i_untiltime = ZFC_TILTIME;
923 z.z_name = NULL;
924 } else {
925 i_gmtoff = ZF_GMTOFF;
926 i_rule = ZF_RULE;
927 i_format = ZF_FORMAT;
928 i_untilyear = ZF_TILYEAR;
929 i_untilmonth = ZF_TILMONTH;
930 i_untilday = ZF_TILDAY;
931 i_untiltime = ZF_TILTIME;
932 z.z_name = ecpyalloc(fields[ZF_NAME]);
933 }
934 z.z_filename = filename;
935 z.z_linenum = linenum;
936 z.z_gmtoff = gethms(fields[i_gmtoff], "invalid GMT offset", TRUE);
937 if ((cp = strchr(fields[i_format], '%')) != 0) {
938 if (*++cp != 's' || strchr(cp, '%') != 0) {
939 error("invalid abbreviation format");
940 return FALSE;
941 }
942 }
943 z.z_rule = ecpyalloc(fields[i_rule]);
944 z.z_format = ecpyalloc(fields[i_format]);
945 hasuntil = nfields > i_untilyear;
946 if (hasuntil) {
947 z.z_untilrule.r_filename = filename;
948 z.z_untilrule.r_linenum = linenum;
949 rulesub(&z.z_untilrule,
950 fields[i_untilyear],
951 "only",
952 "",
953 (nfields > i_untilmonth) ?
954 fields[i_untilmonth] : "Jan",
955 (nfields > i_untilday) ? fields[i_untilday] : "1",
956 (nfields > i_untiltime) ? fields[i_untiltime] : "0");
957 z.z_untiltime = rpytime(&z.z_untilrule,
958 z.z_untilrule.r_loyear);
959 if (iscont && nzones > 0 &&
960 z.z_untiltime > min_time &&
961 z.z_untiltime < max_time &&
962 zones[nzones - 1].z_untiltime > min_time &&
963 zones[nzones - 1].z_untiltime < max_time &&
964 zones[nzones - 1].z_untiltime >= z.z_untiltime) {
965 error("Zone continuation line end time is not \
966 after end time of previous line");
967 return FALSE;
968 }
969 }
970 zones = (struct zone *) (void *) erealloc((char *) zones,
971 (int) ((nzones + 1) * sizeof *zones));
972 zones[nzones++] = z;
973 /*
974 ** If there was an UNTIL field on this line,
975 ** there's more information about the zone on the next line.
976 */
977 return hasuntil;
978 }
979
980 static void
981 inleap(fields, nfields)
982 register char ** const fields;
983 const int nfields;
984 {
985 register const char * cp;
986 register const struct lookup * lp;
987 register int i, j;
988 int year, month, day;
989 long dayoff, tod;
990 time_t t;
991
992 if (nfields != LEAP_FIELDS) {
993 error("wrong number of fields on Leap line");
994 return;
995 }
996 dayoff = 0;
997 cp = fields[LP_YEAR];
998 if (sscanf(cp, scheck(cp, "%d"), &year) != 1) {
999 /*
1000 * Leapin' Lizards!
1001 */
1002 error("invalid leaping year");
1003 return;
1004 }
1005 j = EPOCH_YEAR;
1006 while (j != year) {
1007 if (year > j) {
1008 i = len_years[isleap(j)];
1009 ++j;
1010 } else {
1011 --j;
1012 i = -len_years[isleap(j)];
1013 }
1014 dayoff = oadd(dayoff, eitol(i));
1015 }
1016 if ((lp = byword(fields[LP_MONTH], mon_names)) == NULL) {
1017 error("invalid month name");
1018 return;
1019 }
1020 month = lp->l_value;
1021 j = TM_JANUARY;
1022 while (j != month) {
1023 i = len_months[isleap(year)][j];
1024 dayoff = oadd(dayoff, eitol(i));
1025 ++j;
1026 }
1027 cp = fields[LP_DAY];
1028 if (sscanf(cp, scheck(cp, "%d"), &day) != 1 ||
1029 day <= 0 || day > len_months[isleap(year)][month]) {
1030 error("invalid day of month");
1031 return;
1032 }
1033 dayoff = oadd(dayoff, eitol(day - 1));
1034 if (dayoff < 0 && !tt_signed) {
1035 error("time before zero");
1036 return;
1037 }
1038 t = (time_t) dayoff * SECSPERDAY;
1039 /*
1040 ** Cheap overflow check.
1041 */
1042 if (t / SECSPERDAY != dayoff) {
1043 error("time overflow");
1044 return;
1045 }
1046 tod = gethms(fields[LP_TIME], "invalid time of day", FALSE);
1047 cp = fields[LP_CORR];
1048 {
1049 register int positive;
1050 int count;
1051
1052 if (strcmp(cp, "") == 0) { /* infile() turns "-" into "" */
1053 positive = FALSE;
1054 count = 1;
1055 } else if (strcmp(cp, "--") == 0) {
1056 positive = FALSE;
1057 count = 2;
1058 } else if (strcmp(cp, "+") == 0) {
1059 positive = TRUE;
1060 count = 1;
1061 } else if (strcmp(cp, "++") == 0) {
1062 positive = TRUE;
1063 count = 2;
1064 } else {
1065 error("illegal CORRECTION field on Leap line");
1066 return;
1067 }
1068 if ((lp = byword(fields[LP_ROLL], leap_types)) == NULL) {
1069 error("illegal Rolling/Stationary field on Leap line");
1070 return;
1071 }
1072 leapadd(tadd(t, tod), positive, lp->l_value, count);
1073 }
1074 }
1075
1076 static void
1077 inlink(fields, nfields)
1078 register char ** const fields;
1079 const int nfields;
1080 {
1081 struct link l;
1082
1083 if (nfields != LINK_FIELDS) {
1084 error("wrong number of fields on Link line");
1085 return;
1086 }
1087 if (*fields[LF_FROM] == '\0') {
1088 error("blank FROM field on Link line");
1089 return;
1090 }
1091 if (*fields[LF_TO] == '\0') {
1092 error("blank TO field on Link line");
1093 return;
1094 }
1095 l.l_filename = filename;
1096 l.l_linenum = linenum;
1097 l.l_from = ecpyalloc(fields[LF_FROM]);
1098 l.l_to = ecpyalloc(fields[LF_TO]);
1099 links = (struct link *) (void *) erealloc((char *) links,
1100 (int) ((nlinks + 1) * sizeof *links));
1101 links[nlinks++] = l;
1102 }
1103
1104 static void
1105 rulesub(rp, loyearp, hiyearp, typep, monthp, dayp, timep)
1106 register struct rule * const rp;
1107 const char * const loyearp;
1108 const char * const hiyearp;
1109 const char * const typep;
1110 const char * const monthp;
1111 const char * const dayp;
1112 const char * const timep;
1113 {
1114 register const struct lookup * lp;
1115 register const char * cp;
1116 register char * dp;
1117 register char * ep;
1118
1119 if ((lp = byword(monthp, mon_names)) == NULL) {
1120 error("invalid month name");
1121 return;
1122 }
1123 rp->r_month = lp->l_value;
1124 rp->r_todisstd = FALSE;
1125 rp->r_todisgmt = FALSE;
1126 dp = ecpyalloc(timep);
1127 if (*dp != '\0') {
1128 ep = dp + strlen(dp) - 1;
1129 switch (lowerit(*ep)) {
1130 case 's': /* Standard */
1131 rp->r_todisstd = TRUE;
1132 rp->r_todisgmt = FALSE;
1133 *ep = '\0';
1134 break;
1135 case 'w': /* Wall */
1136 rp->r_todisstd = FALSE;
1137 rp->r_todisgmt = FALSE;
1138 *ep = '\0';
1139 case 'g': /* Greenwich */
1140 case 'u': /* Universal */
1141 case 'z': /* Zulu */
1142 rp->r_todisstd = TRUE;
1143 rp->r_todisgmt = TRUE;
1144 *ep = '\0';
1145 break;
1146 }
1147 }
1148 rp->r_tod = gethms(dp, "invalid time of day", FALSE);
1149 ifree(dp);
1150 /*
1151 ** Year work.
1152 */
1153 cp = loyearp;
1154 lp = byword(cp, begin_years);
1155 if (lp != NULL) switch ((int) lp->l_value) {
1156 case YR_MINIMUM:
1157 rp->r_loyear = min_int;
1158 break;
1159 case YR_MAXIMUM:
1160 rp->r_loyear = max_int;
1161 break;
1162 default: /* "cannot happen" */
1163 (void) fprintf(stderr,
1164 "%s: panic: Invalid l_value %d\n",
1165 progname, lp->l_value);
1166 (void) exit(EXIT_FAILURE);
1167 } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_loyear) != 1) {
1168 error("invalid starting year");
1169 return;
1170 }
1171 cp = hiyearp;
1172 if ((lp = byword(cp, end_years)) != NULL) switch ((int) lp->l_value) {
1173 case YR_MINIMUM:
1174 rp->r_hiyear = min_int;
1175 break;
1176 case YR_MAXIMUM:
1177 rp->r_hiyear = max_int;
1178 break;
1179 case YR_ONLY:
1180 rp->r_hiyear = rp->r_loyear;
1181 break;
1182 default: /* "cannot happen" */
1183 (void) fprintf(stderr,
1184 "%s: panic: Invalid l_value %d\n",
1185 progname, lp->l_value);
1186 (void) exit(EXIT_FAILURE);
1187 } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_hiyear) != 1) {
1188 error("invalid ending year");
1189 return;
1190 }
1191 if (rp->r_loyear > rp->r_hiyear) {
1192 error("starting year greater than ending year");
1193 return;
1194 }
1195 if (*typep == '\0')
1196 rp->r_yrtype = NULL;
1197 else {
1198 if (rp->r_loyear == rp->r_hiyear) {
1199 error("typed single year");
1200 return;
1201 }
1202 rp->r_yrtype = ecpyalloc(typep);
1203 }
1204 /*
1205 ** Day work.
1206 ** Accept things such as:
1207 ** 1
1208 ** last-Sunday
1209 ** Sun<=20
1210 ** Sun>=7
1211 */
1212 dp = ecpyalloc(dayp);
1213 if ((lp = byword(dp, lasts)) != NULL) {
1214 rp->r_dycode = DC_DOWLEQ;
1215 rp->r_wday = lp->l_value;
1216 rp->r_dayofmonth = len_months[1][rp->r_month];
1217 } else {
1218 if ((ep = strchr(dp, '<')) != 0)
1219 rp->r_dycode = DC_DOWLEQ;
1220 else if ((ep = strchr(dp, '>')) != 0)
1221 rp->r_dycode = DC_DOWGEQ;
1222 else {
1223 ep = dp;
1224 rp->r_dycode = DC_DOM;
1225 }
1226 if (rp->r_dycode != DC_DOM) {
1227 *ep++ = 0;
1228 if (*ep++ != '=') {
1229 error("invalid day of month");
1230 ifree(dp);
1231 return;
1232 }
1233 if ((lp = byword(dp, wday_names)) == NULL) {
1234 error("invalid weekday name");
1235 ifree(dp);
1236 return;
1237 }
1238 rp->r_wday = lp->l_value;
1239 }
1240 if (sscanf(ep, scheck(ep, "%d"), &rp->r_dayofmonth) != 1 ||
1241 rp->r_dayofmonth <= 0 ||
1242 (rp->r_dayofmonth > len_months[1][rp->r_month])) {
1243 error("invalid day of month");
1244 ifree(dp);
1245 return;
1246 }
1247 }
1248 ifree(dp);
1249 }
1250
1251 static void
1252 convert(val, buf)
1253 const long val;
1254 char * const buf;
1255 {
1256 register int i;
1257 register long shift;
1258
1259 for (i = 0, shift = 24; i < 4; ++i, shift -= 8)
1260 buf[i] = val >> shift;
1261 }
1262
1263 static void
1264 puttzcode(val, fp)
1265 const long val;
1266 FILE * const fp;
1267 {
1268 char buf[4];
1269
1270 convert(val, buf);
1271 (void) fwrite((void *) buf, (size_t) sizeof buf, (size_t) 1, fp);
1272 }
1273
1274 static void
1275 writezone(name)
1276 const char * const name;
1277 {
1278 register FILE * fp;
1279 register int i, j;
1280 static char * fullname;
1281 static struct tzhead tzh;
1282
1283 fullname = erealloc(fullname,
1284 (int) (strlen(directory) + 1 + strlen(name) + 1));
1285 (void) sprintf(fullname, "%s/%s", directory, name);
1286 if ((fp = fopen(fullname, "wb")) == NULL) {
1287 if (mkdirs(fullname) != 0)
1288 (void) exit(EXIT_FAILURE);
1289 if ((fp = fopen(fullname, "wb")) == NULL) {
1290 (void) fprintf(stderr, "%s: Can't create ", progname);
1291 (void) perror(fullname);
1292 (void) exit(EXIT_FAILURE);
1293 }
1294 }
1295 convert(eitol(typecnt), tzh.tzh_ttisgmtcnt);
1296 convert(eitol(typecnt), tzh.tzh_ttisstdcnt);
1297 convert(eitol(leapcnt), tzh.tzh_leapcnt);
1298 convert(eitol(timecnt), tzh.tzh_timecnt);
1299 convert(eitol(typecnt), tzh.tzh_typecnt);
1300 convert(eitol(charcnt), tzh.tzh_charcnt);
1301 #define DO(field) (void) fwrite((void *) tzh.field, \
1302 (size_t) sizeof tzh.field, (size_t) 1, fp)
1303 DO(tzh_reserved);
1304 DO(tzh_ttisgmtcnt);
1305 DO(tzh_ttisstdcnt);
1306 DO(tzh_leapcnt);
1307 DO(tzh_timecnt);
1308 DO(tzh_typecnt);
1309 DO(tzh_charcnt);
1310 #undef DO
1311 for (i = 0; i < timecnt; ++i) {
1312 j = leapcnt;
1313 while (--j >= 0)
1314 if (ats[i] >= trans[j]) {
1315 ats[i] = tadd(ats[i], corr[j]);
1316 break;
1317 }
1318 puttzcode((long) ats[i], fp);
1319 }
1320 if (timecnt > 0)
1321 (void) fwrite((void *) types, (size_t) sizeof types[0],
1322 (size_t) timecnt, fp);
1323 for (i = 0; i < typecnt; ++i) {
1324 puttzcode((long) gmtoffs[i], fp);
1325 (void) putc(isdsts[i], fp);
1326 (void) putc(abbrinds[i], fp);
1327 }
1328 if (charcnt != 0)
1329 (void) fwrite((void *) chars, (size_t) sizeof chars[0],
1330 (size_t) charcnt, fp);
1331 for (i = 0; i < leapcnt; ++i) {
1332 if (roll[i]) {
1333 if (timecnt == 0 || trans[i] < ats[0]) {
1334 j = 0;
1335 while (isdsts[j])
1336 if (++j >= typecnt) {
1337 j = 0;
1338 break;
1339 }
1340 } else {
1341 j = 1;
1342 while (j < timecnt && trans[i] >= ats[j])
1343 ++j;
1344 j = types[j - 1];
1345 }
1346 puttzcode((long) tadd(trans[i], -gmtoffs[j]), fp);
1347 } else puttzcode((long) trans[i], fp);
1348 puttzcode((long) corr[i], fp);
1349 }
1350 for (i = 0; i < typecnt; ++i)
1351 (void) putc(ttisstds[i], fp);
1352 for (i = 0; i < typecnt; ++i)
1353 (void) putc(ttisgmts[i], fp);
1354 if (ferror(fp) || fclose(fp)) {
1355 (void) fprintf(stderr, "%s: Write error on ", progname);
1356 (void) perror(fullname);
1357 (void) exit(EXIT_FAILURE);
1358 }
1359 }
1360
1361 static void
1362 doabbr(abbr, format, letters, isdst)
1363 char * const abbr;
1364 const char * const format;
1365 const char * const letters;
1366 const int isdst;
1367 {
1368 if (strchr(format, '/') == NULL) {
1369 if (letters == NULL)
1370 (void) strcpy(abbr, format);
1371 else (void) sprintf(abbr, format, letters);
1372 } else if (isdst)
1373 (void) strcpy(abbr, strchr(format, '/') + 1);
1374 else {
1375 (void) strcpy(abbr, format);
1376 *strchr(abbr, '/') = '\0';
1377 }
1378 }
1379
1380 static void
1381 outzone(zpfirst, zonecount)
1382 const struct zone * const zpfirst;
1383 const int zonecount;
1384 {
1385 register const struct zone * zp;
1386 register struct rule * rp;
1387 register int i, j;
1388 register int usestart, useuntil;
1389 register time_t starttime, untiltime;
1390 register long gmtoff;
1391 register long stdoff;
1392 register int year;
1393 register long startoff;
1394 register int startisdst;
1395 register int startttisstd;
1396 register int startttisgmt;
1397 register int type;
1398 char startbuf[BUFSIZ];
1399
1400 INITIALIZE(untiltime);
1401 INITIALIZE(starttime);
1402 INITIALIZE(startoff);
1403 /*
1404 ** Now. . .finally. . .generate some useful data!
1405 */
1406 timecnt = 0;
1407 typecnt = 0;
1408 charcnt = 0;
1409 /*
1410 ** A guess that may well be corrected later.
1411 */
1412 stdoff = 0;
1413 /*
1414 ** Thanks to Earl Chew (earl@dnd.icp.nec.com.au)
1415 ** for noting the need to unconditionally initialize startttisstd.
1416 */
1417 startttisstd = FALSE;
1418 startttisgmt = FALSE;
1419 for (i = 0; i < zonecount; ++i) {
1420 zp = &zpfirst[i];
1421 usestart = i > 0 && (zp - 1)->z_untiltime > min_time;
1422 useuntil = i < (zonecount - 1);
1423 if (useuntil && zp->z_untiltime <= min_time)
1424 continue;
1425 gmtoff = zp->z_gmtoff;
1426 eat(zp->z_filename, zp->z_linenum);
1427 startisdst = -1;
1428 if (zp->z_nrules == 0) {
1429 stdoff = zp->z_stdoff;
1430 doabbr(startbuf, zp->z_format,
1431 (char *) NULL, stdoff != 0);
1432 type = addtype(oadd(zp->z_gmtoff, stdoff),
1433 startbuf, stdoff != 0, startttisstd,
1434 startttisgmt);
1435 if (usestart)
1436 addtt(starttime, type);
1437 else if (stdoff != 0)
1438 addtt(min_time, type);
1439 } else for (year = min_year; year <= max_year; ++year) {
1440 if (useuntil && year > zp->z_untilrule.r_hiyear)
1441 break;
1442 /*
1443 ** Mark which rules to do in the current year.
1444 ** For those to do, calculate rpytime(rp, year);
1445 */
1446 for (j = 0; j < zp->z_nrules; ++j) {
1447 rp = &zp->z_rules[j];
1448 eats(zp->z_filename, zp->z_linenum,
1449 rp->r_filename, rp->r_linenum);
1450 rp->r_todo = year >= rp->r_loyear &&
1451 year <= rp->r_hiyear &&
1452 yearistype(year, rp->r_yrtype);
1453 if (rp->r_todo)
1454 rp->r_temp = rpytime(rp, year);
1455 }
1456 for ( ; ; ) {
1457 register int k;
1458 register time_t jtime, ktime;
1459 register long offset;
1460 char buf[BUFSIZ];
1461
1462 INITIALIZE(ktime);
1463 if (useuntil) {
1464 /*
1465 ** Turn untiltime into GMT
1466 ** assuming the current gmtoff and
1467 ** stdoff values.
1468 */
1469 untiltime = zp->z_untiltime;
1470 if (!zp->z_untilrule.r_todisgmt)
1471 untiltime = tadd(untiltime,
1472 -gmtoff);
1473 if (!zp->z_untilrule.r_todisstd)
1474 untiltime = tadd(untiltime,
1475 -stdoff);
1476 }
1477 /*
1478 ** Find the rule (of those to do, if any)
1479 ** that takes effect earliest in the year.
1480 */
1481 k = -1;
1482 for (j = 0; j < zp->z_nrules; ++j) {
1483 rp = &zp->z_rules[j];
1484 if (!rp->r_todo)
1485 continue;
1486 eats(zp->z_filename, zp->z_linenum,
1487 rp->r_filename, rp->r_linenum);
1488 offset = rp->r_todisgmt ? 0 : gmtoff;
1489 if (!rp->r_todisstd)
1490 offset = oadd(offset, stdoff);
1491 jtime = rp->r_temp;
1492 if (jtime == min_time ||
1493 jtime == max_time)
1494 continue;
1495 jtime = tadd(jtime, -offset);
1496 if (k < 0 || jtime < ktime) {
1497 k = j;
1498 ktime = jtime;
1499 }
1500 }
1501 if (k < 0)
1502 break; /* go on to next year */
1503 rp = &zp->z_rules[k];
1504 rp->r_todo = FALSE;
1505 if (useuntil && ktime >= untiltime)
1506 break;
1507 if (usestart) {
1508 if (ktime < starttime) {
1509 stdoff = rp->r_stdoff;
1510 startoff = oadd(zp->z_gmtoff,
1511 rp->r_stdoff);
1512 doabbr(startbuf, zp->z_format,
1513 rp->r_abbrvar,
1514 rp->r_stdoff != 0);
1515 startisdst = rp->r_stdoff != 0;
1516 continue;
1517 }
1518 usestart = FALSE;
1519 if (ktime != starttime) {
1520 if (startisdst < 0 &&
1521 zp->z_gmtoff !=
1522 (zp - 1)->z_gmtoff) {
1523 type = (timecnt == 0) ? 0 :
1524 types[timecnt - 1];
1525 startoff = oadd(gmtoffs[type],
1526 -(zp - 1)->z_gmtoff);
1527 startisdst = startoff != 0;
1528 startoff = oadd(startoff,
1529 zp->z_gmtoff);
1530 (void) strcpy(startbuf,
1531 &chars[abbrinds[type]]);
1532 }
1533 if (startisdst >= 0)
1534 addtt(starttime, addtype(startoff, startbuf, startisdst, startttisstd,
1535 startttisgmt));
1536 }
1537 }
1538 eats(zp->z_filename, zp->z_linenum,
1539 rp->r_filename, rp->r_linenum);
1540 doabbr(buf, zp->z_format, rp->r_abbrvar,
1541 rp->r_stdoff != 0);
1542 offset = oadd(zp->z_gmtoff, rp->r_stdoff);
1543 type = addtype(offset, buf, rp->r_stdoff != 0,
1544 rp->r_todisstd, rp->r_todisgmt);
1545 addtt(ktime, type);
1546 stdoff = rp->r_stdoff;
1547 }
1548 }
1549 /*
1550 ** Now we may get to set starttime for the next zone line.
1551 */
1552 if (useuntil) {
1553 starttime = tadd(zp->z_untiltime, -gmtoff);
1554 startttisstd = zp->z_untilrule.r_todisstd;
1555 startttisgmt = zp->z_untilrule.r_todisgmt;
1556 if (!startttisstd)
1557 starttime = tadd(starttime, -stdoff);
1558 }
1559 }
1560 writezone(zpfirst->z_name);
1561 }
1562
1563 static void
1564 addtt(starttime, type)
1565 const time_t starttime;
1566 const int type;
1567 {
1568 if (timecnt != 0 && type == types[timecnt - 1])
1569 return; /* easy enough! */
1570 if (timecnt == 0 && type == 0 && isdsts[0] == 0)
1571 return; /* handled by default rule */
1572 if (timecnt >= TZ_MAX_TIMES) {
1573 error("too many transitions?!");
1574 (void) exit(EXIT_FAILURE);
1575 }
1576 ats[timecnt] = starttime;
1577 types[timecnt] = type;
1578 ++timecnt;
1579 }
1580
1581 static int
1582 addtype(gmtoff, abbr, isdst, ttisstd, ttisgmt)
1583 const long gmtoff;
1584 const char * const abbr;
1585 const int isdst;
1586 const int ttisstd;
1587 const int ttisgmt;
1588 {
1589 register int i, j;
1590
1591 /*
1592 ** See if there's already an entry for this zone type.
1593 ** If so, just return its index.
1594 */
1595 for (i = 0; i < typecnt; ++i) {
1596 if (gmtoff == gmtoffs[i] && isdst == isdsts[i] &&
1597 strcmp(abbr, &chars[abbrinds[i]]) == 0 &&
1598 ttisstd == ttisstds[i] &&
1599 ttisgmt == ttisgmts[i])
1600 return i;
1601 }
1602 /*
1603 ** There isn't one; add a new one, unless there are already too
1604 ** many.
1605 */
1606 if (typecnt >= TZ_MAX_TYPES) {
1607 error("too many local time types");
1608 (void) exit(EXIT_FAILURE);
1609 }
1610 gmtoffs[i] = gmtoff;
1611 isdsts[i] = isdst;
1612 ttisstds[i] = ttisstd;
1613 ttisgmts[i] = ttisgmt;
1614
1615 for (j = 0; j < charcnt; ++j)
1616 if (strcmp(&chars[j], abbr) == 0)
1617 break;
1618 if (j == charcnt)
1619 newabbr(abbr);
1620 abbrinds[i] = j;
1621 ++typecnt;
1622 return i;
1623 }
1624
1625 static void
1626 leapadd(t, positive, rolling, count)
1627 const time_t t;
1628 const int positive;
1629 const int rolling;
1630 int count;
1631 {
1632 register int i, j;
1633
1634 if (leapcnt + (positive ? count : 1) > TZ_MAX_LEAPS) {
1635 error("too many leap seconds");
1636 (void) exit(EXIT_FAILURE);
1637 }
1638 for (i = 0; i < leapcnt; ++i)
1639 if (t <= trans[i]) {
1640 if (t == trans[i]) {
1641 error("repeated leap second moment");
1642 (void) exit(EXIT_FAILURE);
1643 }
1644 break;
1645 }
1646 do {
1647 for (j = leapcnt; j > i; --j) {
1648 trans[j] = trans[j - 1];
1649 corr[j] = corr[j - 1];
1650 roll[j] = roll[j - 1];
1651 }
1652 trans[i] = t;
1653 corr[i] = positive ? 1L : eitol(-count);
1654 roll[i] = rolling;
1655 ++leapcnt;
1656 } while (positive && --count != 0);
1657 }
1658
1659 static void
1660 adjleap P((void))
1661 {
1662 register int i;
1663 register long last = 0;
1664
1665 /*
1666 ** propagate leap seconds forward
1667 */
1668 for (i = 0; i < leapcnt; ++i) {
1669 trans[i] = tadd(trans[i], last);
1670 last = corr[i] += last;
1671 }
1672 }
1673
1674 static int
1675 yearistype(year, type)
1676 const int year;
1677 const char * const type;
1678 {
1679 static char * buf;
1680 int result;
1681
1682 if (type == NULL || *type == '\0')
1683 return TRUE;
1684 buf = erealloc(buf, (int) (132 + strlen(yitcommand) + strlen(type)));
1685 (void) sprintf(buf, "%s %d %s", yitcommand, year, type);
1686 result = system(buf);
1687 if (result == 0)
1688 return TRUE;
1689 if (result == (1 << 8))
1690 return FALSE;
1691 error("Wild result from command execution");
1692 (void) fprintf(stderr, "%s: command was '%s', result was %d\n",
1693 progname, buf, result);
1694 for ( ; ; )
1695 (void) exit(EXIT_FAILURE);
1696 }
1697
1698 static int
1699 lowerit(a)
1700 const int a;
1701 {
1702 return (isascii(a) && isupper(a)) ? tolower(a) : a;
1703 }
1704
1705 static int
1706 ciequal(ap, bp) /* case-insensitive equality */
1707 register const char * ap;
1708 register const char * bp;
1709 {
1710 while (lowerit(*ap) == lowerit(*bp++))
1711 if (*ap++ == '\0')
1712 return TRUE;
1713 return FALSE;
1714 }
1715
1716 static int
1717 itsabbr(abbr, word)
1718 register const char * abbr;
1719 register const char * word;
1720 {
1721 if (lowerit(*abbr) != lowerit(*word))
1722 return FALSE;
1723 ++word;
1724 while (*++abbr != '\0')
1725 do if (*word == '\0')
1726 return FALSE;
1727 while (lowerit(*word++) != lowerit(*abbr));
1728 return TRUE;
1729 }
1730
1731 static const struct lookup *
1732 byword(word, table)
1733 register const char * const word;
1734 register const struct lookup * const table;
1735 {
1736 register const struct lookup * foundlp;
1737 register const struct lookup * lp;
1738
1739 if (word == NULL || table == NULL)
1740 return NULL;
1741 /*
1742 ** Look for exact match.
1743 */
1744 for (lp = table; lp->l_word != NULL; ++lp)
1745 if (ciequal(word, lp->l_word))
1746 return lp;
1747 /*
1748 ** Look for inexact match.
1749 */
1750 foundlp = NULL;
1751 for (lp = table; lp->l_word != NULL; ++lp)
1752 if (itsabbr(word, lp->l_word))
1753 if (foundlp == NULL)
1754 foundlp = lp;
1755 else return NULL; /* multiple inexact matches */
1756 return foundlp;
1757 }
1758
1759 static char **
1760 getfields(cp)
1761 register char * cp;
1762 {
1763 register char * dp;
1764 register char ** array;
1765 register int nsubs;
1766
1767 if (cp == NULL)
1768 return NULL;
1769 array = (char **) (void *)
1770 emalloc((int) ((strlen(cp) + 1) * sizeof *array));
1771 nsubs = 0;
1772 for ( ; ; ) {
1773 while (isascii(*cp) && isspace(*cp))
1774 ++cp;
1775 if (*cp == '\0' || *cp == '#')
1776 break;
1777 array[nsubs++] = dp = cp;
1778 do {
1779 if ((*dp = *cp++) != '"')
1780 ++dp;
1781 else while ((*dp = *cp++) != '"')
1782 if (*dp != '\0')
1783 ++dp;
1784 else error("Odd number of quotation marks");
1785 } while (*cp != '\0' && *cp != '#' &&
1786 (!isascii(*cp) || !isspace(*cp)));
1787 if (isascii(*cp) && isspace(*cp))
1788 ++cp;
1789 *dp = '\0';
1790 }
1791 array[nsubs] = NULL;
1792 return array;
1793 }
1794
1795 static long
1796 oadd(t1, t2)
1797 const long t1;
1798 const long t2;
1799 {
1800 register long t;
1801
1802 t = t1 + t2;
1803 if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {
1804 error("time overflow");
1805 (void) exit(EXIT_FAILURE);
1806 }
1807 return t;
1808 }
1809
1810 static time_t
1811 tadd(t1, t2)
1812 const time_t t1;
1813 const long t2;
1814 {
1815 register time_t t;
1816
1817 if (t1 == max_time && t2 > 0)
1818 return max_time;
1819 if (t1 == min_time && t2 < 0)
1820 return min_time;
1821 t = t1 + t2;
1822 if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {
1823 error("time overflow");
1824 (void) exit(EXIT_FAILURE);
1825 }
1826 return t;
1827 }
1828
1829 /*
1830 ** Given a rule, and a year, compute the date - in seconds since January 1,
1831 ** 1970, 00:00 LOCAL time - in that year that the rule refers to.
1832 */
1833
1834 static time_t
1835 rpytime(rp, wantedy)
1836 register const struct rule * const rp;
1837 register const int wantedy;
1838 {
1839 register int y, m, i;
1840 register long dayoff; /* with a nod to Margaret O. */
1841 register time_t t;
1842
1843 if (wantedy == min_int)
1844 return min_time;
1845 if (wantedy == max_int)
1846 return max_time;
1847 dayoff = 0;
1848 m = TM_JANUARY;
1849 y = EPOCH_YEAR;
1850 while (wantedy != y) {
1851 if (wantedy > y) {
1852 i = len_years[isleap(y)];
1853 ++y;
1854 } else {
1855 --y;
1856 i = -len_years[isleap(y)];
1857 }
1858 dayoff = oadd(dayoff, eitol(i));
1859 }
1860 while (m != rp->r_month) {
1861 i = len_months[isleap(y)][m];
1862 dayoff = oadd(dayoff, eitol(i));
1863 ++m;
1864 }
1865 i = rp->r_dayofmonth;
1866 if (m == TM_FEBRUARY && i == 29 && !isleap(y)) {
1867 if (rp->r_dycode == DC_DOWLEQ)
1868 --i;
1869 else {
1870 error("use of 2/29 in non leap-year");
1871 (void) exit(EXIT_FAILURE);
1872 }
1873 }
1874 --i;
1875 dayoff = oadd(dayoff, eitol(i));
1876 if (rp->r_dycode == DC_DOWGEQ || rp->r_dycode == DC_DOWLEQ) {
1877 register long wday;
1878
1879 #define LDAYSPERWEEK ((long) DAYSPERWEEK)
1880 wday = eitol(EPOCH_WDAY);
1881 /*
1882 ** Don't trust mod of negative numbers.
1883 */
1884 if (dayoff >= 0)
1885 wday = (wday + dayoff) % LDAYSPERWEEK;
1886 else {
1887 wday -= ((-dayoff) % LDAYSPERWEEK);
1888 if (wday < 0)
1889 wday += LDAYSPERWEEK;
1890 }
1891 while (wday != eitol(rp->r_wday))
1892 if (rp->r_dycode == DC_DOWGEQ) {
1893 dayoff = oadd(dayoff, (long) 1);
1894 if (++wday >= LDAYSPERWEEK)
1895 wday = 0;
1896 ++i;
1897 } else {
1898 dayoff = oadd(dayoff, (long) -1);
1899 if (--wday < 0)
1900 wday = LDAYSPERWEEK - 1;
1901 --i;
1902 }
1903 if (i < 0 || i >= len_months[isleap(y)][m]) {
1904 error("no day in month matches rule");
1905 (void) exit(EXIT_FAILURE);
1906 }
1907 }
1908 if (dayoff < 0 && !tt_signed)
1909 return min_time;
1910 t = (time_t) dayoff * SECSPERDAY;
1911 /*
1912 ** Cheap overflow check.
1913 */
1914 if (t / SECSPERDAY != dayoff)
1915 return (dayoff > 0) ? max_time : min_time;
1916 return tadd(t, rp->r_tod);
1917 }
1918
1919 static void
1920 newabbr(string)
1921 const char * const string;
1922 {
1923 register int i;
1924
1925 i = strlen(string) + 1;
1926 if (charcnt + i > TZ_MAX_CHARS) {
1927 error("too many, or too long, time zone abbreviations");
1928 (void) exit(EXIT_FAILURE);
1929 }
1930 (void) strcpy(&chars[charcnt], string);
1931 charcnt += eitol(i);
1932 }
1933
1934 static int
1935 mkdirs(argname)
1936 char * const argname;
1937 {
1938 register char * name;
1939 register char * cp;
1940
1941 if (argname == NULL || *argname == '\0')
1942 return 0;
1943 cp = name = ecpyalloc(argname);
1944 while ((cp = strchr(cp + 1, '/')) != 0) {
1945 *cp = '\0';
1946 #ifndef unix
1947 /*
1948 ** DOS drive specifier?
1949 */
1950 if (strlen(name) == 2 && isascii(name[0]) &&
1951 isalpha(name[0]) && name[1] == ':') {
1952 *cp = '/';
1953 continue;
1954 }
1955 #endif /* !defined unix */
1956 if (!itsdir(name)) {
1957 /*
1958 ** It doesn't seem to exist, so we try to create it.
1959 */
1960 if (mkdir(name, 0755) != 0) {
1961 (void) fprintf(stderr,
1962 "%s: Can't create directory ",
1963 progname);
1964 (void) perror(name);
1965 ifree(name);
1966 return -1;
1967 }
1968 }
1969 *cp = '/';
1970 }
1971 ifree(name);
1972 return 0;
1973 }
1974
1975 static long
1976 eitol(i)
1977 const int i;
1978 {
1979 long l;
1980
1981 l = i;
1982 if ((i < 0 && l >= 0) || (i == 0 && l != 0) || (i > 0 && l <= 0)) {
1983 (void) fprintf(stderr,
1984 "%s: %d did not sign extend correctly\n",
1985 progname, i);
1986 (void) exit(EXIT_FAILURE);
1987 }
1988 return l;
1989 }
1990
1991 /*
1992 ** UNIX was a registered trademark of UNIX System Laboratories in 1993.
1993 */
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