* sysdeps/unix/bsd/ultrix4/mips/start.S: Use s0, s1, and s2
[kopensolaris-gnu/glibc.git] / time / zic.c
1 #ifndef lint
2 #ifndef NOID
3 static char     elsieid[] = "@(#)zic.c  7.28";
4 #endif /* !defined NOID */
5 #endif /* !defined lint */
6
7 #include "private.h"
8 #include "tzfile.h"
9
10 struct rule {
11         const char *    r_filename;
12         int             r_linenum;
13         const char *    r_name;
14
15         int             r_loyear;       /* for example, 1986 */
16         int             r_hiyear;       /* for example, 1986 */
17         const char *    r_yrtype;
18
19         int             r_month;        /* 0..11 */
20
21         int             r_dycode;       /* see below */
22         int             r_dayofmonth;
23         int             r_wday;
24
25         long            r_tod;          /* time from midnight */
26         int             r_todisstd;     /* above is standard time if TRUE */
27                                         /* or wall clock time if FALSE */
28         int             r_todisuniv;    /* above is universal time if TRUE */
29                                         /* or local time if FALSE */
30         long            r_stdoff;       /* offset from standard time */
31         const char *    r_abbrvar;      /* variable part of abbreviation */
32
33         int             r_todo;         /* a rule to do (used in outzone) */
34         time_t          r_temp;         /* used in outzone */
35 };
36
37 /*
38 **      r_dycode                r_dayofmonth    r_wday
39 */
40
41 #define DC_DOM          0       /* 1..31 */     /* unused */
42 #define DC_DOWGEQ       1       /* 1..31 */     /* 0..6 (Sun..Sat) */
43 #define DC_DOWLEQ       2       /* 1..31 */     /* 0..6 (Sun..Sat) */
44
45 struct zone {
46         const char *    z_filename;
47         int             z_linenum;
48
49         const char *    z_name;
50         long            z_gmtoff;
51         const char *    z_rule;
52         const char *    z_format;
53
54         long            z_stdoff;
55
56         struct rule *   z_rules;
57         int             z_nrules;
58
59         struct rule     z_untilrule;
60         time_t          z_untiltime;
61 };
62
63 extern int      emkdir P((const char * name, int mode));
64 extern int      getopt P((int argc, char * argv[], const char * options));
65 extern char *   icatalloc P((char * old, const char * new));
66 extern char *   icpyalloc P((const char * string));
67 extern void     ifree P((char * p));
68 extern char *   imalloc P((int n));
69 extern void *   irealloc P((void * old, int n));
70 extern int      link P((const char * fromname, const char * toname));
71 extern char *   optarg;
72 extern int      optind;
73 extern char *   scheck P((const char * string, const char * format));
74
75 static void     addtt P((time_t starttime, int type));
76 static int      addtype P((long gmtoff, const char * abbr, int isdst,
77                                 int ttisstd));
78 static void     leapadd P((time_t t, int positive, int rolling, int count));
79 static void     adjleap P((void));
80 static void     associate P((void));
81 static int      ciequal P((const char * ap, const char * bp));
82 static void     convert P((long val, char * buf));
83 static void     dolink P((const char * fromfile, const char * tofile));
84 static void     eat P((const char * name, int num));
85 static void     eats P((const char * name, int num,
86                         const char * rname, int rnum));
87 static long     eitol P((int i));
88 static void     error P((const char * message));
89 static char **  getfields P((char * buf));
90 static long     gethms P((const char * string, const char * errstrng,
91                         int signable));
92 static void     infile P((const char * filename));
93 static void     inleap P((char ** fields, int nfields));
94 static void     inlink P((char ** fields, int nfields));
95 static void     inrule P((char ** fields, int nfields));
96 static int      inzcont P((char ** fields, int nfields));
97 static int      inzone P((char ** fields, int nfields));
98 static int      inzsub P((char ** fields, int nfields, int iscont));
99 static int      itsabbr P((const char * abbr, const char * word));
100 static int      itsdir P((const char * name));
101 static int      lowerit P((int c));
102 static char *   memcheck P((char * tocheck));
103 static int      mkdirs P((char * filename));
104 static void     newabbr P((const char * abbr));
105 static long     oadd P((long t1, long t2));
106 static void     outzone P((const struct zone * zp, int ntzones));
107 static void     puttzcode P((long code, FILE * fp));
108 static int      rcomp P((const genericptr_T leftp, const genericptr_T rightp));
109 static time_t   rpytime P((const struct rule * rp, int wantedy));
110 static void     rulesub P((struct rule * rp,
111                         const char * loyearp, const char * hiyearp,
112                         const char * typep, const char * monthp,
113                         const char * dayp, const char * timep));
114 static void     setboundaries P((void));
115 static time_t   tadd P((time_t t1, long t2));
116 static void     usage P((void));
117 static void     writezone P((const char * name));
118 static int      yearistype P((int year, const char * type));
119
120 static int              charcnt;
121 static int              errors;
122 static const char *     filename;
123 static int              leapcnt;
124 static int              linenum;
125 static int              max_int;
126 static time_t           max_time;
127 static int              max_year;
128 static int              min_int;
129 static time_t           min_time;
130 static int              min_year;
131 static int              noise;
132 static const char *     rfilename;
133 static int              rlinenum;
134 static const char *     progname;
135 static int              timecnt;
136 static int              typecnt;
137 static int              tt_signed;
138
139 /*
140 ** Line codes.
141 */
142
143 #define LC_RULE         0
144 #define LC_ZONE         1
145 #define LC_LINK         2
146 #define LC_LEAP         3
147
148 /*
149 ** Which fields are which on a Zone line.
150 */
151
152 #define ZF_NAME         1
153 #define ZF_GMTOFF       2
154 #define ZF_RULE         3
155 #define ZF_FORMAT       4
156 #define ZF_TILYEAR      5
157 #define ZF_TILMONTH     6
158 #define ZF_TILDAY       7
159 #define ZF_TILTIME      8
160 #define ZONE_MINFIELDS  5
161 #define ZONE_MAXFIELDS  9
162
163 /*
164 ** Which fields are which on a Zone continuation line.
165 */
166
167 #define ZFC_GMTOFF      0
168 #define ZFC_RULE        1
169 #define ZFC_FORMAT      2
170 #define ZFC_TILYEAR     3
171 #define ZFC_TILMONTH    4
172 #define ZFC_TILDAY      5
173 #define ZFC_TILTIME     6
174 #define ZONEC_MINFIELDS 3
175 #define ZONEC_MAXFIELDS 7
176
177 /*
178 ** Which files are which on a Rule line.
179 */
180
181 #define RF_NAME         1
182 #define RF_LOYEAR       2
183 #define RF_HIYEAR       3
184 #define RF_COMMAND      4
185 #define RF_MONTH        5
186 #define RF_DAY          6
187 #define RF_TOD          7
188 #define RF_STDOFF       8
189 #define RF_ABBRVAR      9
190 #define RULE_FIELDS     10
191
192 /*
193 ** Which fields are which on a Link line.
194 */
195
196 #define LF_FROM         1
197 #define LF_TO           2
198 #define LINK_FIELDS     3
199
200 /*
201 ** Which fields are which on a Leap line.
202 */
203
204 #define LP_YEAR         1
205 #define LP_MONTH        2
206 #define LP_DAY          3
207 #define LP_TIME         4
208 #define LP_CORR         5
209 #define LP_ROLL         6
210 #define LEAP_FIELDS     7
211
212 /*
213 ** Year synonyms.
214 */
215
216 #define YR_MINIMUM      0
217 #define YR_MAXIMUM      1
218 #define YR_ONLY         2
219
220 static struct rule *    rules;
221 static int              nrules; /* number of rules */
222
223 static struct zone *    zones;
224 static int              nzones; /* number of zones */
225
226 struct link {
227         const char *    l_filename;
228         int             l_linenum;
229         const char *    l_from;
230         const char *    l_to;
231 };
232
233 static struct link *    links;
234 static int              nlinks;
235
236 struct lookup {
237         const char *    l_word;
238         const int       l_value;
239 };
240
241 static struct lookup const *    byword P((const char * string,
242                                         const struct lookup * lp));
243
244 static struct lookup const      line_codes[] = {
245         { "Rule",       LC_RULE },
246         { "Zone",       LC_ZONE },
247         { "Link",       LC_LINK },
248         { "Leap",       LC_LEAP },
249         { NULL,         0}
250 };
251
252 static struct lookup const      mon_names[] = {
253         { "January",    TM_JANUARY },
254         { "February",   TM_FEBRUARY },
255         { "March",      TM_MARCH },
256         { "April",      TM_APRIL },
257         { "May",        TM_MAY },
258         { "June",       TM_JUNE },
259         { "July",       TM_JULY },
260         { "August",     TM_AUGUST },
261         { "September",  TM_SEPTEMBER },
262         { "October",    TM_OCTOBER },
263         { "November",   TM_NOVEMBER },
264         { "December",   TM_DECEMBER },
265         { NULL,         0 }
266 };
267
268 static struct lookup const      wday_names[] = {
269         { "Sunday",     TM_SUNDAY },
270         { "Monday",     TM_MONDAY },
271         { "Tuesday",    TM_TUESDAY },
272         { "Wednesday",  TM_WEDNESDAY },
273         { "Thursday",   TM_THURSDAY },
274         { "Friday",     TM_FRIDAY },
275         { "Saturday",   TM_SATURDAY },
276         { NULL,         0 }
277 };
278
279 static struct lookup const      lasts[] = {
280         { "last-Sunday",        TM_SUNDAY },
281         { "last-Monday",        TM_MONDAY },
282         { "last-Tuesday",       TM_TUESDAY },
283         { "last-Wednesday",     TM_WEDNESDAY },
284         { "last-Thursday",      TM_THURSDAY },
285         { "last-Friday",        TM_FRIDAY },
286         { "last-Saturday",      TM_SATURDAY },
287         { NULL,                 0 }
288 };
289
290 static struct lookup const      begin_years[] = {
291         { "minimum",    YR_MINIMUM },
292         { "maximum",    YR_MAXIMUM },
293         { NULL,         0 }
294 };
295
296 static struct lookup const      end_years[] = {
297         { "minimum",    YR_MINIMUM },
298         { "maximum",    YR_MAXIMUM },
299         { "only",       YR_ONLY },
300         { NULL,         0 }
301 };
302
303 static struct lookup const      leap_types[] = {
304         { "Rolling",    TRUE },
305         { "Stationary", FALSE },
306         { NULL,         0 }
307 };
308
309 static const int        len_months[2][MONSPERYEAR] = {
310         { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
311         { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
312 };
313
314 static const int        len_years[2] = {
315         DAYSPERNYEAR, DAYSPERLYEAR
316 };
317
318 static time_t           ats[TZ_MAX_TIMES];
319 static unsigned char    types[TZ_MAX_TIMES];
320 static long             gmtoffs[TZ_MAX_TYPES];
321 static char             isdsts[TZ_MAX_TYPES];
322 static unsigned char    abbrinds[TZ_MAX_TYPES];
323 static char             ttisstds[TZ_MAX_TYPES];
324 static char             chars[TZ_MAX_CHARS];
325 static time_t           trans[TZ_MAX_LEAPS];
326 static long             corr[TZ_MAX_LEAPS];
327 static char             roll[TZ_MAX_LEAPS];
328
329 /*
330 ** Memory allocation.
331 */
332
333 static char *
334 memcheck(ptr)
335 char * const    ptr;
336 {
337         if (ptr == NULL) {
338                 (void) perror(progname);
339                 (void) exit(EXIT_FAILURE);
340         }
341         return ptr;
342 }
343
344 #define emalloc(size)           memcheck(imalloc(size))
345 #define erealloc(ptr, size)     memcheck(irealloc((ptr), (size)))
346 #define ecpyalloc(ptr)          memcheck(icpyalloc(ptr))
347 #define ecatalloc(oldp, newp)   memcheck(icatalloc((oldp), (newp)))
348
349 /*
350 ** Error handling.
351 */
352
353 static void
354 eats(name, num, rname, rnum)
355 const char * const      name;
356 const int               num;
357 const char * const      rname;
358 const int               rnum;
359 {
360         filename = name;
361         linenum = num;
362         rfilename = rname;
363         rlinenum = rnum;
364 }
365
366 static void
367 eat(name, num)
368 const char * const      name;
369 const int               num;
370 {
371         eats(name, num, (char *) NULL, -1);
372 }
373
374 static void
375 error(string)
376 const char * const      string;
377 {
378         /*
379         ** Match the format of "cc" to allow sh users to
380         **      zic ... 2>&1 | error -t "*" -v
381         ** on BSD systems.
382         */
383         (void) fprintf(stderr, "\"%s\", line %d: %s",
384                 filename, linenum, string);
385         if (rfilename != NULL)
386                 (void) fprintf(stderr, " (rule from \"%s\", line %d)",
387                         rfilename, rlinenum);
388         (void) fprintf(stderr, "\n");
389         ++errors;
390 }
391
392 static void
393 usage P((void))
394 {
395         (void) fprintf(stderr,
396 "%s: usage is %s [ -s ] [ -v ] [ -l localtime ] [ -p posixrules ] [ -d directory ] \n\
397 \t[ -L leapseconds ] [ -y yearistype ] [ filename ... ]\n",
398                 progname, progname);
399         (void) exit(EXIT_FAILURE);
400 }
401
402 static const char *     psxrules;
403 static const char *     lcltime;
404 static const char *     directory;
405 static const char *     leapsec;
406 static const char *     yitcommand;
407 static int              sflag = FALSE;
408
409 int
410 main(argc, argv)
411 int     argc;
412 char *  argv[];
413 {
414         register int    i, j;
415         register int    c;
416
417 #ifdef unix
418         (void) umask(umask(022) | 022);
419 #endif /* defined unix */
420         progname = argv[0];
421         while ((c = getopt(argc, argv, "d:l:p:L:vsy:")) != EOF)
422                 switch (c) {
423                         default:
424                                 usage();
425                         case 'd':
426                                 if (directory == NULL)
427                                         directory = optarg;
428                                 else {
429                                         (void) fprintf(stderr,
430 "%s: More than one -d option specified\n",
431                                                 progname);
432                                         (void) exit(EXIT_FAILURE);
433                                 }
434                                 break;
435                         case 'l':
436                                 if (lcltime == NULL)
437                                         lcltime = optarg;
438                                 else {
439                                         (void) fprintf(stderr,
440 "%s: More than one -l option specified\n",
441                                                 progname);
442                                         (void) exit(EXIT_FAILURE);
443                                 }
444                                 break;
445                         case 'p':
446                                 if (psxrules == NULL)
447                                         psxrules = optarg;
448                                 else {
449                                         (void) fprintf(stderr,
450 "%s: More than one -p option specified\n",
451                                                 progname);
452                                         (void) exit(EXIT_FAILURE);
453                                 }
454                                 break;
455                         case 'y':
456                                 if (yitcommand == NULL)
457                                         yitcommand = optarg;
458                                 else {
459                                         (void) fprintf(stderr,
460 "%s: More than one -y option specified\n",
461                                                 progname);
462                                         (void) exit(EXIT_FAILURE);
463                                 }
464                                 break;
465                         case 'L':
466                                 if (leapsec == NULL)
467                                         leapsec = optarg;
468                                 else {
469                                         (void) fprintf(stderr,
470 "%s: More than one -L option specified\n",
471                                                 progname);
472                                         (void) exit(EXIT_FAILURE);
473                                 }
474                                 break;
475                         case 'v':
476                                 noise = TRUE;
477                                 break;
478                         case 's':
479                                 sflag = TRUE;
480                                 break;
481                 }
482         if (optind == argc - 1 && strcmp(argv[optind], "=") == 0)
483                 usage();        /* usage message by request */
484         if (directory == NULL)
485                 directory = TZDIR;
486         if (yitcommand == NULL)
487                 yitcommand = "yearistype";
488
489         setboundaries();
490
491         if (optind < argc && leapsec != NULL) {
492                 infile(leapsec);
493                 adjleap();
494         }
495
496         for (i = optind; i < argc; ++i)
497                 infile(argv[i]);
498         if (errors)
499                 (void) exit(EXIT_FAILURE);
500         associate();
501         for (i = 0; i < nzones; i = j) {
502                 /*
503                 ** Find the next non-continuation zone entry.
504                 */
505                 for (j = i + 1; j < nzones && zones[j].z_name == NULL; ++j)
506                         continue;
507                 outzone(&zones[i], j - i);
508         }
509         /*
510         ** Make links.
511         */
512         for (i = 0; i < nlinks; ++i)
513                 dolink(links[i].l_from, links[i].l_to);
514         if (lcltime != NULL)
515                 dolink(lcltime, TZDEFAULT);
516         if (psxrules != NULL)
517                 dolink(psxrules, TZDEFRULES);
518         return (errors == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
519 }
520
521 static void
522 dolink(fromfile, tofile)
523 const char * const      fromfile;
524 const char * const      tofile;
525 {
526         register char * fromname;
527         register char * toname;
528
529         if (fromfile[0] == '/')
530                 fromname = ecpyalloc(fromfile);
531         else {
532                 fromname = ecpyalloc(directory);
533                 fromname = ecatalloc(fromname, "/");
534                 fromname = ecatalloc(fromname, fromfile);
535         }
536         if (tofile[0] == '/')
537                 toname = ecpyalloc(tofile);
538         else {
539                 toname = ecpyalloc(directory);
540                 toname = ecatalloc(toname, "/");
541                 toname = ecatalloc(toname, tofile);
542         }
543         /*
544         ** We get to be careful here since
545         ** there's a fair chance of root running us.
546         */
547         if (!itsdir(toname))
548                 (void) remove(toname);
549         if (link(fromname, toname) != 0) {
550                 if (mkdirs(toname) != 0)
551                         (void) exit(EXIT_FAILURE);
552                 if (link(fromname, toname) != 0) {
553                         (void) fprintf(stderr, "%s: Can't link from %s to ",
554                                 progname, fromname);
555                         (void) perror(toname);
556                         (void) exit(EXIT_FAILURE);
557                 }
558         }
559         ifree(fromname);
560         ifree(toname);
561 }
562
563 static void
564 setboundaries P((void))
565 {
566         register time_t bit;
567         register int bii;
568
569         for (bit = 1; bit > 0; bit <<= 1)
570                 continue;
571         if (bit == 0) {         /* time_t is an unsigned type */
572                 tt_signed = FALSE;
573                 min_time = 0;
574                 max_time = ~(time_t) 0;
575                 if (sflag)
576                         max_time >>= 1;
577         } else {
578                 tt_signed = TRUE;
579                 min_time = bit;
580                 max_time = bit;
581                 ++max_time;
582                 max_time = -max_time;
583                 if (sflag)
584                         min_time = 0;
585         }
586         min_year = TM_YEAR_BASE + gmtime(&min_time)->tm_year;
587         max_year = TM_YEAR_BASE + gmtime(&max_time)->tm_year;
588
589         for (bii = 1; bii > 0; bii <<= 1)
590                 continue;
591         min_int = bii;
592         max_int = -1 - bii;
593 }
594
595 static int
596 itsdir(name)
597 const char * const      name;
598 {
599         register char * myname;
600         register int    accres;
601
602         myname = ecpyalloc(name);
603         myname = ecatalloc(myname, "/.");
604         accres = access(myname, 0);
605         ifree(myname);
606         return accres == 0;
607 }
608
609 /*
610 ** Associate sets of rules with zones.
611 */
612
613 /*
614 ** Sort by rule name.
615 */
616
617 static int
618 rcomp(cp1, cp2)
619 const genericptr_T      cp1;
620 const genericptr_T      cp2;
621 {
622         return strcmp(((struct rule *) cp1)->r_name,
623                 ((struct rule *) cp2)->r_name);
624 }
625
626 static void
627 associate P((void))
628 {
629         register struct zone *  zp;
630         register struct rule *  rp;
631         register int            base, out;
632         register int            i;
633
634         if (nrules != 0)
635                 (void) qsort((genericptr_T) rules,
636                         (qsort_size_T) nrules,
637                         (qsort_size_T) sizeof *rules, rcomp);
638         for (i = 0; i < nzones; ++i) {
639                 zp = &zones[i];
640                 zp->z_rules = NULL;
641                 zp->z_nrules = 0;
642         }
643         for (base = 0; base < nrules; base = out) {
644                 rp = &rules[base];
645                 for (out = base + 1; out < nrules; ++out)
646                         if (strcmp(rp->r_name, rules[out].r_name) != 0)
647                                 break;
648                 for (i = 0; i < nzones; ++i) {
649                         zp = &zones[i];
650                         if (strcmp(zp->z_rule, rp->r_name) != 0)
651                                 continue;
652                         zp->z_rules = rp;
653                         zp->z_nrules = out - base;
654                 }
655         }
656         for (i = 0; i < nzones; ++i) {
657                 zp = &zones[i];
658                 if (zp->z_nrules == 0) {
659                         /*
660                         ** Maybe we have a local standard time offset.
661                         */
662                         eat(zp->z_filename, zp->z_linenum);
663                         zp->z_stdoff = gethms(zp->z_rule, "unruly zone", TRUE);
664                         /*
665                         ** Note, though, that if there's no rule,
666                         ** a '%s' in the format is a bad thing.
667                         */
668                         if (strchr(zp->z_format, '%') != 0)
669                                 error("%s in ruleless zone");
670                 }
671         }
672         if (errors)
673                 (void) exit(EXIT_FAILURE);
674 }
675
676 static void
677 infile(name)
678 const char *    name;
679 {
680         register FILE *                 fp;
681         register char **                fields;
682         register char *                 cp;
683         register const struct lookup *  lp;
684         register int                    nfields;
685         register int                    wantcont;
686         register int                    num;
687         char                            buf[BUFSIZ];
688
689         if (strcmp(name, "-") == 0) {
690                 name = "standard input";
691                 fp = stdin;
692         } else if ((fp = fopen(name, "r")) == NULL) {
693                 (void) fprintf(stderr, "%s: Can't open ", progname);
694                 (void) perror(name);
695                 (void) exit(EXIT_FAILURE);
696         }
697         wantcont = FALSE;
698         for (num = 1; ; ++num) {
699                 eat(name, num);
700                 if (fgets(buf, (int) sizeof buf, fp) != buf)
701                         break;
702                 cp = strchr(buf, '\n');
703                 if (cp == NULL) {
704                         error("line too long");
705                         (void) exit(EXIT_FAILURE);
706                 }
707                 *cp = '\0';
708                 fields = getfields(buf);
709                 nfields = 0;
710                 while (fields[nfields] != NULL) {
711                         static char     nada;
712
713                         if (ciequal(fields[nfields], "-"))
714                                 fields[nfields] = &nada;
715                         ++nfields;
716                 }
717                 if (nfields == 0) {
718                         /* nothing to do */
719                 } else if (wantcont) {
720                         wantcont = inzcont(fields, nfields);
721                 } else {
722                         lp = byword(fields[0], line_codes);
723                         if (lp == NULL)
724                                 error("input line of unknown type");
725                         else switch ((int) (lp->l_value)) {
726                                 case LC_RULE:
727                                         inrule(fields, nfields);
728                                         wantcont = FALSE;
729                                         break;
730                                 case LC_ZONE:
731                                         wantcont = inzone(fields, nfields);
732                                         break;
733                                 case LC_LINK:
734                                         inlink(fields, nfields);
735                                         wantcont = FALSE;
736                                         break;
737                                 case LC_LEAP:
738                                         if (name != leapsec)
739                                                 (void) fprintf(stderr,
740 "%s: Leap line in non leap seconds file %s\n",
741                                                         progname, name);
742                                         else    inleap(fields, nfields);
743                                         wantcont = FALSE;
744                                         break;
745                                 default:        /* "cannot happen" */
746                                         (void) fprintf(stderr,
747 "%s: panic: Invalid l_value %d\n",
748                                                 progname, lp->l_value);
749                                         (void) exit(EXIT_FAILURE);
750                         }
751                 }
752                 ifree((char *) fields);
753         }
754         if (ferror(fp)) {
755                 (void) fprintf(stderr, "%s: Error reading ", progname);
756                 (void) perror(filename);
757                 (void) exit(EXIT_FAILURE);
758         }
759         if (fp != stdin && fclose(fp)) {
760                 (void) fprintf(stderr, "%s: Error closing ", progname);
761                 (void) perror(filename);
762                 (void) exit(EXIT_FAILURE);
763         }
764         if (wantcont)
765                 error("expected continuation line not found");
766 }
767
768 /*
769 ** Convert a string of one of the forms
770 **      h       -h      hh:mm   -hh:mm  hh:mm:ss        -hh:mm:ss
771 ** into a number of seconds.
772 ** A null string maps to zero.
773 ** Call error with errstring and return zero on errors.
774 */
775
776 static long
777 gethms(string, errstring, signable)
778 const char *            string;
779 const char * const      errstring;
780 const int               signable;
781 {
782         int     hh, mm, ss, sign;
783
784         if (string == NULL || *string == '\0')
785                 return 0;
786         if (!signable)
787                 sign = 1;
788         else if (*string == '-') {
789                 sign = -1;
790                 ++string;
791         } else  sign = 1;
792         if (sscanf(string, scheck(string, "%d"), &hh) == 1)
793                 mm = ss = 0;
794         else if (sscanf(string, scheck(string, "%d:%d"), &hh, &mm) == 2)
795                 ss = 0;
796         else if (sscanf(string, scheck(string, "%d:%d:%d"),
797                 &hh, &mm, &ss) != 3) {
798                         error(errstring);
799                         return 0;
800         }
801         if (hh < 0 || hh >= HOURSPERDAY ||
802                 mm < 0 || mm >= MINSPERHOUR ||
803                 ss < 0 || ss > SECSPERMIN) {
804                         error(errstring);
805                         return 0;
806         }
807         return eitol(sign) *
808                 (eitol(hh * MINSPERHOUR + mm) *
809                 eitol(SECSPERMIN) + eitol(ss));
810 }
811
812 static void
813 inrule(fields, nfields)
814 register char ** const  fields;
815 const int               nfields;
816 {
817         static struct rule      r;
818
819         if (nfields != RULE_FIELDS) {
820                 error("wrong number of fields on Rule line");
821                 return;
822         }
823         if (*fields[RF_NAME] == '\0') {
824                 error("nameless rule");
825                 return;
826         }
827         r.r_filename = filename;
828         r.r_linenum = linenum;
829         r.r_stdoff = gethms(fields[RF_STDOFF], "invalid saved time", TRUE);
830         rulesub(&r, fields[RF_LOYEAR], fields[RF_HIYEAR], fields[RF_COMMAND],
831                 fields[RF_MONTH], fields[RF_DAY], fields[RF_TOD]);
832         r.r_name = ecpyalloc(fields[RF_NAME]);
833         r.r_abbrvar = ecpyalloc(fields[RF_ABBRVAR]);
834         rules = (struct rule *) (void *) erealloc((char *) rules,
835                 (int) ((nrules + 1) * sizeof *rules));
836         rules[nrules++] = r;
837 }
838
839 static int
840 inzone(fields, nfields)
841 register char ** const  fields;
842 const int               nfields;
843 {
844         register int    i;
845         static char *   buf;
846
847         if (nfields < ZONE_MINFIELDS || nfields > ZONE_MAXFIELDS) {
848                 error("wrong number of fields on Zone line");
849                 return FALSE;
850         }
851         if (strcmp(fields[ZF_NAME], TZDEFAULT) == 0 && lcltime != NULL) {
852                 buf = erealloc(buf, (int) (132 + strlen(TZDEFAULT)));
853                 (void) sprintf(buf,
854 "\"Zone %s\" line and -l option are mutually exclusive",
855                         TZDEFAULT);
856                 error(buf);
857                 return FALSE;
858         }
859         if (strcmp(fields[ZF_NAME], TZDEFRULES) == 0 && psxrules != NULL) {
860                 buf = erealloc(buf, (int) (132 + strlen(TZDEFRULES)));
861                 (void) sprintf(buf,
862 "\"Zone %s\" line and -p option are mutually exclusive",
863                         TZDEFRULES);
864                 error(buf);
865                 return FALSE;
866         }
867         for (i = 0; i < nzones; ++i)
868                 if (zones[i].z_name != NULL &&
869                         strcmp(zones[i].z_name, fields[ZF_NAME]) == 0) {
870                                 buf = erealloc(buf, (int) (132 +
871                                         strlen(fields[ZF_NAME]) +
872                                         strlen(zones[i].z_filename)));
873                                 (void) sprintf(buf,
874 "duplicate zone name %s (file \"%s\", line %d)",
875                                         fields[ZF_NAME],
876                                         zones[i].z_filename,
877                                         zones[i].z_linenum);
878                                 error(buf);
879                                 return FALSE;
880                 }
881         return inzsub(fields, nfields, FALSE);
882 }
883
884 static int
885 inzcont(fields, nfields)
886 register char ** const  fields;
887 const int               nfields;
888 {
889         if (nfields < ZONEC_MINFIELDS || nfields > ZONEC_MAXFIELDS) {
890                 error("wrong number of fields on Zone continuation line");
891                 return FALSE;
892         }
893         return inzsub(fields, nfields, TRUE);
894 }
895
896 static int
897 inzsub(fields, nfields, iscont)
898 register char ** const  fields;
899 const int               nfields;
900 const int               iscont;
901 {
902         register char *         cp;
903         static struct zone      z;
904         register int            i_gmtoff, i_rule, i_format;
905         register int            i_untilyear, i_untilmonth;
906         register int            i_untilday, i_untiltime;
907         register int            hasuntil;
908
909         if (iscont) {
910                 i_gmtoff = ZFC_GMTOFF;
911                 i_rule = ZFC_RULE;
912                 i_format = ZFC_FORMAT;
913                 i_untilyear = ZFC_TILYEAR;
914                 i_untilmonth = ZFC_TILMONTH;
915                 i_untilday = ZFC_TILDAY;
916                 i_untiltime = ZFC_TILTIME;
917                 z.z_name = NULL;
918         } else {
919                 i_gmtoff = ZF_GMTOFF;
920                 i_rule = ZF_RULE;
921                 i_format = ZF_FORMAT;
922                 i_untilyear = ZF_TILYEAR;
923                 i_untilmonth = ZF_TILMONTH;
924                 i_untilday = ZF_TILDAY;
925                 i_untiltime = ZF_TILTIME;
926                 z.z_name = ecpyalloc(fields[ZF_NAME]);
927         }
928         z.z_filename = filename;
929         z.z_linenum = linenum;
930         z.z_gmtoff = gethms(fields[i_gmtoff], "invalid GMT offset", TRUE);
931         if ((cp = strchr(fields[i_format], '%')) != 0) {
932                 if (*++cp != 's' || strchr(cp, '%') != 0) {
933                         error("invalid abbreviation format");
934                         return FALSE;
935                 }
936         }
937         z.z_rule = ecpyalloc(fields[i_rule]);
938         z.z_format = ecpyalloc(fields[i_format]);
939         hasuntil = nfields > i_untilyear;
940         if (hasuntil) {
941                 z.z_untilrule.r_filename = filename;
942                 z.z_untilrule.r_linenum = linenum;
943                 rulesub(&z.z_untilrule,
944                         fields[i_untilyear],
945                         "only",
946                         "",
947                         (nfields > i_untilmonth) ?
948                         fields[i_untilmonth] : "Jan",
949                         (nfields > i_untilday) ? fields[i_untilday] : "1",
950                         (nfields > i_untiltime) ? fields[i_untiltime] : "0");
951                 z.z_untiltime = rpytime(&z.z_untilrule,
952                         z.z_untilrule.r_loyear);
953                 if (iscont && nzones > 0 &&
954                         z.z_untiltime > min_time &&
955                         z.z_untiltime < max_time &&
956                         zones[nzones - 1].z_untiltime > min_time &&
957                         zones[nzones - 1].z_untiltime < max_time &&
958                         zones[nzones - 1].z_untiltime >= z.z_untiltime) {
959 error("Zone continuation line end time is not after end time of previous line");
960                                 return FALSE;
961                 }
962         }
963         zones = (struct zone *) (void *) erealloc((char *) zones,
964                 (int) ((nzones + 1) * sizeof *zones));
965         zones[nzones++] = z;
966         /*
967         ** If there was an UNTIL field on this line,
968         ** there's more information about the zone on the next line.
969         */
970         return hasuntil;
971 }
972
973 static void
974 inleap(fields, nfields)
975 register char ** const  fields;
976 const int               nfields;
977 {
978         register const char *           cp;
979         register const struct lookup *  lp;
980         register int                    i, j;
981         int                             year, month, day;
982         long                            dayoff, tod;
983         time_t                          t;
984
985         if (nfields != LEAP_FIELDS) {
986                 error("wrong number of fields on Leap line");
987                 return;
988         }
989         dayoff = 0;
990         cp = fields[LP_YEAR];
991         if (sscanf(cp, scheck(cp, "%d"), &year) != 1) {
992                         /*
993                          * Leapin' Lizards!
994                          */
995                         error("invalid leaping year");
996                         return;
997         }
998         j = EPOCH_YEAR;
999         while (j != year) {
1000                 if (year > j) {
1001                         i = len_years[isleap(j)];
1002                         ++j;
1003                 } else {
1004                         --j;
1005                         i = -len_years[isleap(j)];
1006                 }
1007                 dayoff = oadd(dayoff, eitol(i));
1008         }
1009         if ((lp = byword(fields[LP_MONTH], mon_names)) == NULL) {
1010                 error("invalid month name");
1011                 return;
1012         }
1013         month = lp->l_value;
1014         j = TM_JANUARY;
1015         while (j != month) {
1016                 i = len_months[isleap(year)][j];
1017                 dayoff = oadd(dayoff, eitol(i));
1018                 ++j;
1019         }
1020         cp = fields[LP_DAY];
1021         if (sscanf(cp, scheck(cp, "%d"), &day) != 1 ||
1022                 day <= 0 || day > len_months[isleap(year)][month]) {
1023                         error("invalid day of month");
1024                         return;
1025         }
1026         dayoff = oadd(dayoff, eitol(day - 1));
1027         if (dayoff < 0 && !tt_signed) {
1028                 error("time before zero");
1029                 return;
1030         }
1031         t = (time_t) dayoff * SECSPERDAY;
1032         /*
1033         ** Cheap overflow check.
1034         */
1035         if (t / SECSPERDAY != dayoff) {
1036                 error("time overflow");
1037                 return;
1038         }
1039         tod = gethms(fields[LP_TIME], "invalid time of day", FALSE);
1040         cp = fields[LP_CORR];
1041         {
1042                 register int    positive;
1043                 int             count;
1044
1045                 if (strcmp(cp, "") == 0) { /* infile() turns "-" into "" */
1046                         positive = FALSE;
1047                         count = 1;
1048                 } else if (strcmp(cp, "--") == 0) {
1049                         positive = FALSE;
1050                         count = 2;
1051                 } else if (strcmp(cp, "+") == 0) {
1052                         positive = TRUE;
1053                         count = 1;
1054                 } else if (strcmp(cp, "++") == 0) {
1055                         positive = TRUE;
1056                         count = 2;
1057                 } else {
1058                         error("illegal CORRECTION field on Leap line");
1059                         return;
1060                 }
1061                 if ((lp = byword(fields[LP_ROLL], leap_types)) == NULL) {
1062                         error("illegal Rolling/Stationary field on Leap line");
1063                         return;
1064                 }
1065                 leapadd(tadd(t, tod), positive, lp->l_value, count);
1066         }
1067 }
1068
1069 static void
1070 inlink(fields, nfields)
1071 register char ** const  fields;
1072 const int               nfields;
1073 {
1074         struct link     l;
1075
1076         if (nfields != LINK_FIELDS) {
1077                 error("wrong number of fields on Link line");
1078                 return;
1079         }
1080         if (*fields[LF_FROM] == '\0') {
1081                 error("blank FROM field on Link line");
1082                 return;
1083         }
1084         if (*fields[LF_TO] == '\0') {
1085                 error("blank TO field on Link line");
1086                 return;
1087         }
1088         l.l_filename = filename;
1089         l.l_linenum = linenum;
1090         l.l_from = ecpyalloc(fields[LF_FROM]);
1091         l.l_to = ecpyalloc(fields[LF_TO]);
1092         links = (struct link *) (void *) erealloc((char *) links,
1093                 (int) ((nlinks + 1) * sizeof *links));
1094         links[nlinks++] = l;
1095 }
1096
1097 static void
1098 rulesub(rp, loyearp, hiyearp, typep, monthp, dayp, timep)
1099 register struct rule * const    rp;
1100 const char * const              loyearp;
1101 const char * const              hiyearp;
1102 const char * const              typep;
1103 const char * const              monthp;
1104 const char * const              dayp;
1105 const char * const              timep;
1106 {
1107         register const struct lookup *  lp;
1108         register const char *           cp;
1109         register char *                 dp;
1110         register char *                 ep;
1111
1112         if ((lp = byword(monthp, mon_names)) == NULL) {
1113                 error("invalid month name");
1114                 return;
1115         }
1116         rp->r_month = lp->l_value;
1117         rp->r_todisstd = FALSE;
1118         rp->r_todisuniv = FALSE;
1119         dp = ecpyalloc(timep);
1120         if (*dp != '\0') {
1121                 ep = dp + strlen(dp) - 1;
1122                 switch (lowerit(*ep)) {
1123                         case 's':       /* Standard */
1124                                 rp->r_todisstd = TRUE;
1125                                 rp->r_todisuniv = FALSE;
1126                                 *ep = '\0';
1127                                 break;
1128                         case 'w':       /* Wall */
1129                                 rp->r_todisstd = FALSE;
1130                                 rp->r_todisuniv = FALSE;
1131                                 *ep = '\0';
1132                         case 'g':       /* Greenwich */
1133                         case 'u':       /* Universal */
1134                         case 'z':       /* Zulu */
1135                                 rp->r_todisstd = TRUE;
1136                                 rp->r_todisuniv = TRUE;
1137                                 *ep = '\0';
1138                                 break;
1139                 }
1140         }
1141         rp->r_tod = gethms(dp, "invalid time of day", FALSE);
1142         ifree(dp);
1143         /*
1144         ** Year work.
1145         */
1146         cp = loyearp;
1147         if ((lp = byword(cp, begin_years)) != NULL) switch ((int) lp->l_value) {
1148                 case YR_MINIMUM:
1149                         rp->r_loyear = min_int;
1150                         break;
1151                 case YR_MAXIMUM:
1152                         rp->r_loyear = max_int;
1153                         break;
1154                 default:        /* "cannot happen" */
1155                         (void) fprintf(stderr,
1156                                 "%s: panic: Invalid l_value %d\n",
1157                                 progname, lp->l_value);
1158                         (void) exit(EXIT_FAILURE);
1159         } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_loyear) != 1) {
1160                 error("invalid starting year");
1161                 return;
1162         }
1163         cp = hiyearp;
1164         if ((lp = byword(cp, end_years)) != NULL) switch ((int) lp->l_value) {
1165                 case YR_MINIMUM:
1166                         rp->r_hiyear = min_int;
1167                         break;
1168                 case YR_MAXIMUM:
1169                         rp->r_hiyear = max_int;
1170                         break;
1171                 case YR_ONLY:
1172                         rp->r_hiyear = rp->r_loyear;
1173                         break;
1174                 default:        /* "cannot happen" */
1175                         (void) fprintf(stderr,
1176                                 "%s: panic: Invalid l_value %d\n",
1177                                 progname, lp->l_value);
1178                         (void) exit(EXIT_FAILURE);
1179         } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_hiyear) != 1) {
1180                 error("invalid ending year");
1181                 return;
1182         }
1183         if (rp->r_loyear > rp->r_hiyear) {
1184                 error("starting year greater than ending year");
1185                 return;
1186         }
1187         if (*typep == '\0')
1188                 rp->r_yrtype = NULL;
1189         else {
1190                 if (rp->r_loyear == rp->r_hiyear) {
1191                         error("typed single year");
1192                         return;
1193                 }
1194                 rp->r_yrtype = ecpyalloc(typep);
1195         }
1196         /*
1197         ** Day work.
1198         ** Accept things such as:
1199         **      1
1200         **      last-Sunday
1201         **      Sun<=20
1202         **      Sun>=7
1203         */
1204         dp = ecpyalloc(dayp);
1205         if ((lp = byword(dp, lasts)) != NULL) {
1206                 rp->r_dycode = DC_DOWLEQ;
1207                 rp->r_wday = lp->l_value;
1208                 rp->r_dayofmonth = len_months[1][rp->r_month];
1209         } else {
1210                 if ((ep = strchr(dp, '<')) != 0)
1211                         rp->r_dycode = DC_DOWLEQ;
1212                 else if ((ep = strchr(dp, '>')) != 0)
1213                         rp->r_dycode = DC_DOWGEQ;
1214                 else {
1215                         ep = dp;
1216                         rp->r_dycode = DC_DOM;
1217                 }
1218                 if (rp->r_dycode != DC_DOM) {
1219                         *ep++ = 0;
1220                         if (*ep++ != '=') {
1221                                 error("invalid day of month");
1222                                 ifree(dp);
1223                                 return;
1224                         }
1225                         if ((lp = byword(dp, wday_names)) == NULL) {
1226                                 error("invalid weekday name");
1227                                 ifree(dp);
1228                                 return;
1229                         }
1230                         rp->r_wday = lp->l_value;
1231                 }
1232                 if (sscanf(ep, scheck(ep, "%d"), &rp->r_dayofmonth) != 1 ||
1233                         rp->r_dayofmonth <= 0 ||
1234                         (rp->r_dayofmonth > len_months[1][rp->r_month])) {
1235                                 error("invalid day of month");
1236                                 ifree(dp);
1237                                 return;
1238                 }
1239         }
1240         ifree(dp);
1241 }
1242
1243 static void
1244 convert(val, buf)
1245 const long      val;
1246 char * const    buf;
1247 {
1248         register int    i;
1249         register long   shift;
1250
1251         for (i = 0, shift = 24; i < 4; ++i, shift -= 8)
1252                 buf[i] = val >> shift;
1253 }
1254
1255 static void
1256 puttzcode(val, fp)
1257 const long      val;
1258 FILE * const    fp;
1259 {
1260         char    buf[4];
1261
1262         convert(val, buf);
1263         (void) fwrite((genericptr_T) buf,
1264                 (fwrite_size_T) sizeof buf,
1265                 (fwrite_size_T) 1, fp);
1266 }
1267
1268 static void
1269 writezone(name)
1270 const char * const      name;
1271 {
1272         register FILE *         fp;
1273         register int            i, j;
1274         static char *           fullname;
1275         static struct tzhead    tzh;
1276
1277         fullname = erealloc(fullname,
1278                 (int) (strlen(directory) + 1 + strlen(name) + 1));
1279         (void) sprintf(fullname, "%s/%s", directory, name);
1280         if ((fp = fopen(fullname, "wb")) == NULL) {
1281                 if (mkdirs(fullname) != 0)
1282                         (void) exit(EXIT_FAILURE);
1283                 if ((fp = fopen(fullname, "wb")) == NULL) {
1284                         (void) fprintf(stderr, "%s: Can't create ", progname);
1285                         (void) perror(fullname);
1286                         (void) exit(EXIT_FAILURE);
1287                 }
1288         }
1289         convert(eitol(typecnt), tzh.tzh_ttisstdcnt);
1290         convert(eitol(leapcnt), tzh.tzh_leapcnt);
1291         convert(eitol(timecnt), tzh.tzh_timecnt);
1292         convert(eitol(typecnt), tzh.tzh_typecnt);
1293         convert(eitol(charcnt), tzh.tzh_charcnt);
1294         (void) fwrite((genericptr_T) &tzh,
1295                 (fwrite_size_T) sizeof tzh,
1296                 (fwrite_size_T) 1, fp);
1297         for (i = 0; i < timecnt; ++i) {
1298                 j = leapcnt;
1299                 while (--j >= 0)
1300                         if (ats[i] >= trans[j]) {
1301                                 ats[i] = tadd(ats[i], corr[j]);
1302                                 break;
1303                         }
1304                 puttzcode((long) ats[i], fp);
1305         }
1306         if (timecnt > 0)
1307                 (void) fwrite((genericptr_T) types,
1308                         (fwrite_size_T) sizeof types[0],
1309                         (fwrite_size_T) timecnt, fp);
1310         for (i = 0; i < typecnt; ++i) {
1311                 puttzcode((long) gmtoffs[i], fp);
1312                 (void) putc(isdsts[i], fp);
1313                 (void) putc(abbrinds[i], fp);
1314         }
1315         if (charcnt != 0)
1316                 (void) fwrite((genericptr_T) chars,
1317                         (fwrite_size_T) sizeof chars[0],
1318                         (fwrite_size_T) charcnt, fp);
1319         for (i = 0; i < leapcnt; ++i) {
1320                 if (roll[i]) {
1321                         if (timecnt == 0 || trans[i] < ats[0]) {
1322                                 j = 0;
1323                                 while (isdsts[j])
1324                                         if (++j >= typecnt) {
1325                                                 j = 0;
1326                                                 break;
1327                                         }
1328                         } else {
1329                                 j = 1;
1330                                 while (j < timecnt && trans[i] >= ats[j])
1331                                         ++j;
1332                                 j = types[j - 1];
1333                         }
1334                         puttzcode((long) tadd(trans[i], -gmtoffs[j]), fp);
1335                 } else  puttzcode((long) trans[i], fp);
1336                 puttzcode((long) corr[i], fp);
1337         }
1338         for (i = 0; i < typecnt; ++i)
1339                 (void) putc(ttisstds[i], fp);
1340         if (ferror(fp) || fclose(fp)) {
1341                 (void) fprintf(stderr, "%s: Write error on ", progname);
1342                 (void) perror(fullname);
1343                 (void) exit(EXIT_FAILURE);
1344         }
1345 }
1346
1347 static void
1348 outzone(zpfirst, zonecount)
1349 const struct zone * const       zpfirst;
1350 const int                       zonecount;
1351 {
1352         register const struct zone *    zp;
1353         register struct rule *          rp;
1354         register int                    i, j;
1355         register int                    usestart, useuntil;
1356         register time_t                 starttime, untiltime;
1357         register long                   gmtoff;
1358         register long                   stdoff;
1359         register int                    year;
1360         register long                   startoff;
1361         register int                    startisdst;
1362         register int                    startttisstd;
1363         register int                    type;
1364         char                            startbuf[BUFSIZ];
1365
1366         INITIALIZE(untiltime);
1367         INITIALIZE(starttime);
1368         INITIALIZE(startoff);
1369         /*
1370         ** Now. . .finally. . .generate some useful data!
1371         */
1372         timecnt = 0;
1373         typecnt = 0;
1374         charcnt = 0;
1375         /*
1376         ** A guess that may well be corrected later.
1377         */
1378         stdoff = 0;
1379         /*
1380         ** Thanks to Earl Chew (earl@dnd.icp.nec.com.au)
1381         ** for noting the need to unconditionally initialize startttisstd.
1382         */
1383         startttisstd = FALSE;
1384 #ifdef lint
1385         starttime = 0;
1386 #endif /* defined lint */
1387         for (i = 0; i < zonecount; ++i) {
1388                 zp = &zpfirst[i];
1389                 usestart = i > 0 && (zp - 1)->z_untiltime > min_time;
1390                 useuntil = i < (zonecount - 1);
1391                 if (useuntil && zp->z_untiltime <= min_time)
1392                         continue;
1393                 gmtoff = zp->z_gmtoff;
1394                 eat(zp->z_filename, zp->z_linenum);
1395                 startisdst = -1;
1396                 if (zp->z_nrules == 0) {
1397                         stdoff = zp->z_stdoff;
1398                         (void) strcpy(startbuf, zp->z_format);
1399                         type = addtype(oadd(zp->z_gmtoff, stdoff),
1400                                 startbuf, stdoff != 0, startttisstd);
1401                         if (usestart)
1402                                 addtt(starttime, type);
1403                         else if (stdoff != 0)
1404                                 addtt(min_time, type);
1405                 } else for (year = min_year; year <= max_year; ++year) {
1406                         if (useuntil && year > zp->z_untilrule.r_hiyear)
1407                                 break;
1408                         /*
1409                         ** Mark which rules to do in the current year.
1410                         ** For those to do, calculate rpytime(rp, year);
1411                         */
1412                         for (j = 0; j < zp->z_nrules; ++j) {
1413                                 rp = &zp->z_rules[j];
1414                                 eats(zp->z_filename, zp->z_linenum,
1415                                         rp->r_filename, rp->r_linenum);
1416                                 rp->r_todo = year >= rp->r_loyear &&
1417                                                 year <= rp->r_hiyear &&
1418                                                 yearistype(year, rp->r_yrtype);
1419                                 if (rp->r_todo)
1420                                         rp->r_temp = rpytime(rp, year);
1421                         }
1422                         for ( ; ; ) {
1423                                 register int    k;
1424                                 register time_t jtime, ktime;
1425                                 register long   offset;
1426                                 char            buf[BUFSIZ];
1427
1428                                 INITIALIZE(ktime);
1429                                 if (useuntil) {
1430                                         /*
1431                                         ** Turn untiltime into GMT
1432                                         ** assuming the current gmtoff and
1433                                         ** stdoff values.
1434                                         */
1435                                         untiltime = zp->z_untiltime;
1436                                         if (!zp->z_untilrule.r_todisuniv)
1437                                                 untiltime = tadd(untiltime,
1438                                                         -gmtoff);
1439                                         if (!zp->z_untilrule.r_todisstd)
1440                                                 untiltime = tadd(untiltime,
1441                                                         -stdoff);
1442                                 }
1443                                 /*
1444                                 ** Find the rule (of those to do, if any)
1445                                 ** that takes effect earliest in the year.
1446                                 */
1447                                 k = -1;
1448 #ifdef lint
1449                                 ktime = 0;
1450 #endif /* defined lint */
1451                                 for (j = 0; j < zp->z_nrules; ++j) {
1452                                         rp = &zp->z_rules[j];
1453                                         if (!rp->r_todo)
1454                                                 continue;
1455                                         eats(zp->z_filename, zp->z_linenum,
1456                                                 rp->r_filename, rp->r_linenum);
1457                                         offset = rp->r_todisuniv ? 0 : gmtoff;
1458                                         if (!rp->r_todisstd)
1459                                                 offset = oadd(offset, stdoff);
1460                                         jtime = rp->r_temp;
1461                                         if (jtime == min_time ||
1462                                                 jtime == max_time)
1463                                                         continue;
1464                                         jtime = tadd(jtime, -offset);
1465                                         if (k < 0 || jtime < ktime) {
1466                                                 k = j;
1467                                                 ktime = jtime;
1468                                         }
1469                                 }
1470                                 if (k < 0)
1471                                         break;  /* go on to next year */
1472                                 rp = &zp->z_rules[k];
1473                                 rp->r_todo = FALSE;
1474                                 if (useuntil && ktime >= untiltime)
1475                                         break;
1476                                 if (usestart) {
1477                                     if (ktime < starttime) {
1478                                         stdoff = rp->r_stdoff;
1479                                         startoff = oadd(zp->z_gmtoff,
1480                                                 rp->r_stdoff);
1481                                         (void) sprintf(startbuf, zp->z_format,
1482                                                 rp->r_abbrvar);
1483                                         startisdst = rp->r_stdoff != 0;
1484                                         continue;
1485                                     }
1486                                     usestart = FALSE;
1487                                     if (ktime != starttime) {
1488                                         if (startisdst < 0 &&
1489                                             zp->z_gmtoff !=
1490                                             (zp - 1)->z_gmtoff) {
1491                                                 type = (timecnt == 0) ? 0 :
1492                                                         types[timecnt - 1];
1493                                                 startoff = oadd(gmtoffs[type],
1494                                                         -(zp - 1)->z_gmtoff);
1495                                                 startisdst = startoff != 0;
1496                                                 startoff = oadd(startoff,
1497                                                         zp->z_gmtoff);
1498                                                 (void) strcpy(startbuf,
1499                                                         &chars[abbrinds[type]]);
1500                                         }
1501                                         if (startisdst >= 0)
1502 addtt(starttime, addtype(startoff, startbuf, startisdst, startttisstd));
1503                                     }
1504                                 }
1505                                 eats(zp->z_filename, zp->z_linenum,
1506                                         rp->r_filename, rp->r_linenum);
1507                                 (void) sprintf(buf, zp->z_format,
1508                                         rp->r_abbrvar);
1509                                 offset = oadd(zp->z_gmtoff, rp->r_stdoff);
1510                                 type = addtype(offset, buf, rp->r_stdoff != 0,
1511                                         rp->r_todisstd);
1512                                 addtt(ktime, type);
1513                                 stdoff = rp->r_stdoff;
1514                         }
1515                 }
1516                 /*
1517                 ** Now we may get to set starttime for the next zone line.
1518                 */
1519                 if (useuntil) {
1520                         starttime = tadd(zp->z_untiltime, -gmtoff);
1521                         startttisstd = zp->z_untilrule.r_todisstd;
1522                         if (!startttisstd)
1523                                 starttime = tadd(starttime, -stdoff);
1524                 }
1525         }
1526         writezone(zpfirst->z_name);
1527 }
1528
1529 static void
1530 addtt(starttime, type)
1531 const time_t    starttime;
1532 const int       type;
1533 {
1534         if (timecnt != 0 && type == types[timecnt - 1])
1535                 return; /* easy enough! */
1536         if (timecnt == 0 && type == 0 && isdsts[0] == 0)
1537                 return; /* handled by default rule */
1538         if (timecnt >= TZ_MAX_TIMES) {
1539                 error("too many transitions?!");
1540                 (void) exit(EXIT_FAILURE);
1541         }
1542         ats[timecnt] = starttime;
1543         types[timecnt] = type;
1544         ++timecnt;
1545 }
1546
1547 static int
1548 addtype(gmtoff, abbr, isdst, ttisstd)
1549 const long              gmtoff;
1550 const char * const      abbr;
1551 const int               isdst;
1552 const int               ttisstd;
1553 {
1554         register int    i, j;
1555
1556         /*
1557         ** See if there's already an entry for this zone type.
1558         ** If so, just return its index.
1559         */
1560         for (i = 0; i < typecnt; ++i) {
1561                 if (gmtoff == gmtoffs[i] && isdst == isdsts[i] &&
1562                         strcmp(abbr, &chars[abbrinds[i]]) == 0 &&
1563                         ttisstd == ttisstds[i])
1564                                 return i;
1565         }
1566         /*
1567         ** There isn't one; add a new one, unless there are already too
1568         ** many.
1569         */
1570         if (typecnt >= TZ_MAX_TYPES) {
1571                 error("too many local time types");
1572                 (void) exit(EXIT_FAILURE);
1573         }
1574         gmtoffs[i] = gmtoff;
1575         isdsts[i] = isdst;
1576         ttisstds[i] = ttisstd;
1577
1578         for (j = 0; j < charcnt; ++j)
1579                 if (strcmp(&chars[j], abbr) == 0)
1580                         break;
1581         if (j == charcnt)
1582                 newabbr(abbr);
1583         abbrinds[i] = j;
1584         ++typecnt;
1585         return i;
1586 }
1587
1588 static void
1589 leapadd(t, positive, rolling, count)
1590 const time_t    t;
1591 const int       positive;
1592 const int       rolling;
1593 int             count;
1594 {
1595         register int    i, j;
1596
1597         if (leapcnt + (positive ? count : 1) > TZ_MAX_LEAPS) {
1598                 error("too many leap seconds");
1599                 (void) exit(EXIT_FAILURE);
1600         }
1601         for (i = 0; i < leapcnt; ++i)
1602                 if (t <= trans[i]) {
1603                         if (t == trans[i]) {
1604                                 error("repeated leap second moment");
1605                                 (void) exit(EXIT_FAILURE);
1606                         }
1607                         break;
1608                 }
1609         do {
1610                 for (j = leapcnt; j > i; --j) {
1611                         trans[j] = trans[j - 1];
1612                         corr[j] = corr[j - 1];
1613                         roll[j] = roll[j - 1];
1614                 }
1615                 trans[i] = t;
1616                 corr[i] = positive ? 1L : eitol(-count);
1617                 roll[i] = rolling;
1618                 ++leapcnt;
1619         } while (positive && --count != 0);
1620 }
1621
1622 static void
1623 adjleap P((void))
1624 {
1625         register int    i;
1626         register long   last = 0;
1627
1628         /*
1629         ** propagate leap seconds forward
1630         */
1631         for (i = 0; i < leapcnt; ++i) {
1632                 trans[i] = tadd(trans[i], last);
1633                 last = corr[i] += last;
1634         }
1635 }
1636
1637 static int
1638 yearistype(year, type)
1639 const int               year;
1640 const char * const      type;
1641 {
1642         static char *   buf;
1643         int             result;
1644
1645         if (type == NULL || *type == '\0')
1646                 return TRUE;
1647         buf = erealloc(buf, (int) (132 + strlen(yitcommand) + strlen(type)));
1648         (void) sprintf(buf, "%s %d %s", yitcommand, year, type);
1649         result = system(buf);
1650         if (result == 0)
1651                 return TRUE;
1652         if (result == (1 << 8))
1653                 return FALSE;
1654         error("Wild result from command execution");
1655         (void) fprintf(stderr, "%s: command was '%s', result was %d\n",
1656                 progname, buf, result);
1657         for ( ; ; )
1658                 (void) exit(EXIT_FAILURE);
1659 }
1660
1661 static int
1662 lowerit(a)
1663 const int       a;
1664 {
1665         return (isascii(a) && isupper(a)) ? tolower(a) : a;
1666 }
1667
1668 static int
1669 ciequal(ap, bp)         /* case-insensitive equality */
1670 register const char *   ap;
1671 register const char *   bp;
1672 {
1673         while (lowerit(*ap) == lowerit(*bp++))
1674                 if (*ap++ == '\0')
1675                         return TRUE;
1676         return FALSE;
1677 }
1678
1679 static int
1680 itsabbr(abbr, word)
1681 register const char *   abbr;
1682 register const char *   word;
1683 {
1684         if (lowerit(*abbr) != lowerit(*word))
1685                 return FALSE;
1686         ++word;
1687         while (*++abbr != '\0')
1688                 do if (*word == '\0')
1689                         return FALSE;
1690                                 while (lowerit(*word++) != lowerit(*abbr));
1691         return TRUE;
1692 }
1693
1694 static const struct lookup *
1695 byword(word, table)
1696 register const char * const             word;
1697 register const struct lookup * const    table;
1698 {
1699         register const struct lookup *  foundlp;
1700         register const struct lookup *  lp;
1701
1702         if (word == NULL || table == NULL)
1703                 return NULL;
1704         /*
1705         ** Look for exact match.
1706         */
1707         for (lp = table; lp->l_word != NULL; ++lp)
1708                 if (ciequal(word, lp->l_word))
1709                         return lp;
1710         /*
1711         ** Look for inexact match.
1712         */
1713         foundlp = NULL;
1714         for (lp = table; lp->l_word != NULL; ++lp)
1715                 if (itsabbr(word, lp->l_word))
1716                         if (foundlp == NULL)
1717                                 foundlp = lp;
1718                         else    return NULL;    /* multiple inexact matches */
1719         return foundlp;
1720 }
1721
1722 static char **
1723 getfields(cp)
1724 register char * cp;
1725 {
1726         register char *         dp;
1727         register char **        array;
1728         register int            nsubs;
1729
1730         if (cp == NULL)
1731                 return NULL;
1732         array = (char **) (void *)
1733                 emalloc((int) ((strlen(cp) + 1) * sizeof *array));
1734         nsubs = 0;
1735         for ( ; ; ) {
1736                 while (isascii(*cp) && isspace(*cp))
1737                         ++cp;
1738                 if (*cp == '\0' || *cp == '#')
1739                         break;
1740                 array[nsubs++] = dp = cp;
1741                 do {
1742                         if ((*dp = *cp++) != '"')
1743                                 ++dp;
1744                         else while ((*dp = *cp++) != '"')
1745                                 if (*dp != '\0')
1746                                         ++dp;
1747                                 else    error("Odd number of quotation marks");
1748                 } while (*cp != '\0' && *cp != '#' &&
1749                         (!isascii(*cp) || !isspace(*cp)));
1750                 if (isascii(*cp) && isspace(*cp))
1751                         ++cp;
1752                 *dp = '\0';
1753         }
1754         array[nsubs] = NULL;
1755         return array;
1756 }
1757
1758 static long
1759 oadd(t1, t2)
1760 const long      t1;
1761 const long      t2;
1762 {
1763         register long   t;
1764
1765         t = t1 + t2;
1766         if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {
1767                 error("time overflow");
1768                 (void) exit(EXIT_FAILURE);
1769         }
1770         return t;
1771 }
1772
1773 static time_t
1774 tadd(t1, t2)
1775 const time_t    t1;
1776 const long      t2;
1777 {
1778         register time_t t;
1779
1780         if (t1 == max_time && t2 > 0)
1781                 return max_time;
1782         if (t1 == min_time && t2 < 0)
1783                 return min_time;
1784         t = t1 + t2;
1785         if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {
1786                 error("time overflow");
1787                 (void) exit(EXIT_FAILURE);
1788         }
1789         return t;
1790 }
1791
1792 /*
1793 ** Given a rule, and a year, compute the date - in seconds since January 1,
1794 ** 1970, 00:00 LOCAL time - in that year that the rule refers to.
1795 */
1796
1797 static time_t
1798 rpytime(rp, wantedy)
1799 register const struct rule * const      rp;
1800 register const int                      wantedy;
1801 {
1802         register int    y, m, i;
1803         register long   dayoff;                 /* with a nod to Margaret O. */
1804         register time_t t;
1805
1806         if (wantedy == min_int)
1807                 return min_time;
1808         if (wantedy == max_int)
1809                 return max_time;
1810         dayoff = 0;
1811         m = TM_JANUARY;
1812         y = EPOCH_YEAR;
1813         while (wantedy != y) {
1814                 if (wantedy > y) {
1815                         i = len_years[isleap(y)];
1816                         ++y;
1817                 } else {
1818                         --y;
1819                         i = -len_years[isleap(y)];
1820                 }
1821                 dayoff = oadd(dayoff, eitol(i));
1822         }
1823         while (m != rp->r_month) {
1824                 i = len_months[isleap(y)][m];
1825                 dayoff = oadd(dayoff, eitol(i));
1826                 ++m;
1827         }
1828         i = rp->r_dayofmonth;
1829         if (m == TM_FEBRUARY && i == 29 && !isleap(y)) {
1830                 if (rp->r_dycode == DC_DOWLEQ)
1831                         --i;
1832                 else {
1833                         error("use of 2/29 in non leap-year");
1834                         (void) exit(EXIT_FAILURE);
1835                 }
1836         }
1837         --i;
1838         dayoff = oadd(dayoff, eitol(i));
1839         if (rp->r_dycode == DC_DOWGEQ || rp->r_dycode == DC_DOWLEQ) {
1840                 register long   wday;
1841
1842 #define LDAYSPERWEEK    ((long) DAYSPERWEEK)
1843                 wday = eitol(EPOCH_WDAY);
1844                 /*
1845                 ** Don't trust mod of negative numbers.
1846                 */
1847                 if (dayoff >= 0)
1848                         wday = (wday + dayoff) % LDAYSPERWEEK;
1849                 else {
1850                         wday -= ((-dayoff) % LDAYSPERWEEK);
1851                         if (wday < 0)
1852                                 wday += LDAYSPERWEEK;
1853                 }
1854                 while (wday != eitol(rp->r_wday))
1855                         if (rp->r_dycode == DC_DOWGEQ) {
1856                                 dayoff = oadd(dayoff, (long) 1);
1857                                 if (++wday >= LDAYSPERWEEK)
1858                                         wday = 0;
1859                                 ++i;
1860                         } else {
1861                                 dayoff = oadd(dayoff, (long) -1);
1862                                 if (--wday < 0)
1863                                         wday = LDAYSPERWEEK - 1;
1864                                 --i;
1865                         }
1866                 if (i < 0 || i >= len_months[isleap(y)][m]) {
1867                         error("no day in month matches rule");
1868                         (void) exit(EXIT_FAILURE);
1869                 }
1870         }
1871         if (dayoff < 0 && !tt_signed)
1872                 return min_time;
1873         t = (time_t) dayoff * SECSPERDAY;
1874         /*
1875         ** Cheap overflow check.
1876         */
1877         if (t / SECSPERDAY != dayoff)
1878                 return (dayoff > 0) ? max_time : min_time;
1879         return tadd(t, rp->r_tod);
1880 }
1881
1882 static void
1883 newabbr(string)
1884 const char * const      string;
1885 {
1886         register int    i;
1887
1888         i = strlen(string) + 1;
1889         if (charcnt + i > TZ_MAX_CHARS) {
1890                 error("too many, or too long, time zone abbreviations");
1891                 (void) exit(EXIT_FAILURE);
1892         }
1893         (void) strcpy(&chars[charcnt], string);
1894         charcnt += eitol(i);
1895 }
1896
1897 static int
1898 mkdirs(argname)
1899 char * const    argname;
1900 {
1901         register char * name;
1902         register char * cp;
1903
1904         if (argname == NULL || *argname == '\0')
1905                 return 0;
1906         cp = name = ecpyalloc(argname);
1907         while ((cp = strchr(cp + 1, '/')) != 0) {
1908                 *cp = '\0';
1909 #ifndef unix
1910                 /*
1911                 ** MS-DOS drive specifier?
1912                 */
1913                 if (strlen(name) == 2 && isascii(name[0]) &&
1914                         isalpha(name[0]) && name[1] == ':') {
1915                                 *cp = '/';
1916                                 continue;
1917                 }
1918 #endif /* !defined unix */
1919                 if (!itsdir(name)) {
1920                         /*
1921                         ** It doesn't seem to exist, so we try to create it.
1922                         */
1923                         if (emkdir(name, 0755) != 0) {
1924                                 (void) fprintf(stderr,
1925                                         "%s: Can't create directory ",
1926                                         progname);
1927                                 (void) perror(name);
1928                                 ifree(name);
1929                                 return -1;
1930                         }
1931                 }
1932                 *cp = '/';
1933         }
1934         ifree(name);
1935         return 0;
1936 }
1937
1938 static long
1939 eitol(i)
1940 const int       i;
1941 {
1942         long    l;
1943
1944         l = i;
1945         if ((i < 0 && l >= 0) || (i == 0 && l != 0) || (i > 0 && l <= 0)) {
1946                 (void) fprintf(stderr,
1947                         "%s: %d did not sign extend correctly\n",
1948                         progname, i);
1949                 (void) exit(EXIT_FAILURE);
1950         }
1951         return l;
1952 }
1953
1954 /*
1955 ** UNIX was a registered trademark of UNIX System Laboratories in 1993.
1956 */