Initial revision
[kopensolaris-gnu/glibc.git] / time / zic.c
1 #ifndef lint
2 #ifndef NOID
3 static char     elsieid[] = "@(#)zic.c  7.22";
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         long            r_stdoff;       /* offset from standard time */
29         const char *    r_abbrvar;      /* variable part of abbreviation */
30
31         int             r_todo;         /* a rule to do (used in outzone) */
32         time_t          r_temp;         /* used in outzone */
33 };
34
35 /*
36 **      r_dycode                r_dayofmonth    r_wday
37 */
38
39 #define DC_DOM          0       /* 1..31 */     /* unused */
40 #define DC_DOWGEQ       1       /* 1..31 */     /* 0..6 (Sun..Sat) */
41 #define DC_DOWLEQ       2       /* 1..31 */     /* 0..6 (Sun..Sat) */
42
43 struct zone {
44         const char *    z_filename;
45         int             z_linenum;
46
47         const char *    z_name;
48         long            z_gmtoff;
49         const char *    z_rule;
50         const char *    z_format;
51
52         long            z_stdoff;
53
54         struct rule *   z_rules;
55         int             z_nrules;
56
57         struct rule     z_untilrule;
58         time_t          z_untiltime;
59 };
60
61 extern int      emkdir P((const char * name, int mode));
62 extern int      getopt P((int argc, char * argv[], const char * options));
63 extern char *   icatalloc P((char * old, const char * new));
64 extern char *   icpyalloc P((const char * string));
65 extern void     ifree P((char * p));
66 extern char *   imalloc P((int n));
67 extern char *   irealloc P((char * old, int n));
68 extern int      link P((const char * fromname, const char * toname));
69 extern char *   optarg;
70 extern int      optind;
71 extern char *   scheck P((const char * string, const char * format));
72
73 static void     addtt P((time_t starttime, int type));
74 static int      addtype P((long gmtoff, const char * abbr, int isdst,
75                                 int ttisstd));
76 static void     leapadd P((time_t t, int positive, int rolling, int count));
77 static void     adjleap P((void));
78 static void     associate P((void));
79 static int      ciequal P((const char * ap, const char * bp));
80 static void     convert P((long val, char * buf));
81 static void     dolink P((const char * fromfile, const char * tofile));
82 static void     eat P((const char * name, int num));
83 static void     eats P((const char * name, int num,
84                         const char * rname, int rnum));
85 static long     eitol P((int i));
86 static void     error P((const char * message));
87 static char **  getfields P((char * buf));
88 static long     gethms P((const char * string, const char * errstrng,
89                         int signable));
90 static void     infile P((const char * filename));
91 static void     inleap P((char ** fields, int nfields));
92 static void     inlink P((char ** fields, int nfields));
93 static void     inrule P((char ** fields, int nfields));
94 static int      inzcont P((char ** fields, int nfields));
95 static int      inzone P((char ** fields, int nfields));
96 static int      inzsub P((char ** fields, int nfields, int iscont));
97 static int      itsabbr P((const char * abbr, const char * word));
98 static int      itsdir P((const char * name));
99 static int      lowerit P((int c));
100 static char *   memcheck P((char * tocheck));
101 static int      mkdirs P((char * filename));
102 static void     newabbr P((const char * abbr));
103 static long     oadd P((long t1, long t2));
104 static void     outzone P((const struct zone * zp, int ntzones));
105 static void     puttzcode P((long code, FILE * fp));
106 static int      rcomp P((const genericptr_t leftp, const genericptr_t rightp));
107 static time_t   rpytime P((const struct rule * rp, int wantedy));
108 static void     rulesub P((struct rule * rp,
109                         char * loyearp, char * hiyearp,
110                         char * typep, char * monthp,
111                         char * dayp, char * timep));
112 static void     setboundaries P((void));
113 static time_t   tadd P((time_t t1, long t2));
114 static void     usage P((void));
115 static void     writezone P((const char * name));
116 static int      yearistype P((int year, const char * type));
117
118 static int              charcnt;
119 static int              errors;
120 static const char *     filename;
121 static int              leapcnt;
122 static int              linenum;
123 static int              max_int;
124 static time_t           max_time;
125 static int              max_year;
126 static int              min_int;
127 static time_t           min_time;
128 static int              min_year;
129 static int              noise;
130 static const char *     rfilename;
131 static int              rlinenum;
132 static const char *     progname;
133 static int              timecnt;
134 static int              typecnt;
135 static int              tt_signed;
136
137 /*
138 ** Line codes.
139 */
140
141 #define LC_RULE         0
142 #define LC_ZONE         1
143 #define LC_LINK         2
144 #define LC_LEAP         3
145
146 /*
147 ** Which fields are which on a Zone line.
148 */
149
150 #define ZF_NAME         1
151 #define ZF_GMTOFF       2
152 #define ZF_RULE         3
153 #define ZF_FORMAT       4
154 #define ZF_TILYEAR      5
155 #define ZF_TILMONTH     6
156 #define ZF_TILDAY       7
157 #define ZF_TILTIME      8
158 #define ZONE_MINFIELDS  5
159 #define ZONE_MAXFIELDS  9
160
161 /*
162 ** Which fields are which on a Zone continuation line.
163 */
164
165 #define ZFC_GMTOFF      0
166 #define ZFC_RULE        1
167 #define ZFC_FORMAT      2
168 #define ZFC_TILYEAR     3
169 #define ZFC_TILMONTH    4
170 #define ZFC_TILDAY      5
171 #define ZFC_TILTIME     6
172 #define ZONEC_MINFIELDS 3
173 #define ZONEC_MAXFIELDS 7
174
175 /*
176 ** Which files are which on a Rule line.
177 */
178
179 #define RF_NAME         1
180 #define RF_LOYEAR       2
181 #define RF_HIYEAR       3
182 #define RF_COMMAND      4
183 #define RF_MONTH        5
184 #define RF_DAY          6
185 #define RF_TOD          7
186 #define RF_STDOFF       8
187 #define RF_ABBRVAR      9
188 #define RULE_FIELDS     10
189
190 /*
191 ** Which fields are which on a Link line.
192 */
193
194 #define LF_FROM         1
195 #define LF_TO           2
196 #define LINK_FIELDS     3
197
198 /*
199 ** Which fields are which on a Leap line.
200 */
201
202 #define LP_YEAR         1
203 #define LP_MONTH        2
204 #define LP_DAY          3
205 #define LP_TIME         4
206 #define LP_CORR         5
207 #define LP_ROLL         6
208 #define LEAP_FIELDS     7
209
210 /*
211 ** Year synonyms.
212 */
213
214 #define YR_MINIMUM      0
215 #define YR_MAXIMUM      1
216 #define YR_ONLY         2
217
218 static struct rule *    rules;
219 static int              nrules; /* number of rules */
220
221 static struct zone *    zones;
222 static int              nzones; /* number of zones */
223
224 struct link {
225         const char *    l_filename;
226         int             l_linenum;
227         const char *    l_from;
228         const char *    l_to;
229 };
230
231 static struct link *    links;
232 static int              nlinks;
233
234 struct lookup {
235         const char *    l_word;
236         const int       l_value;
237 };
238
239 static struct lookup const *    byword P((const char * string,
240                                         const struct lookup * lp));
241
242 static struct lookup const      line_codes[] = {
243         { "Rule",       LC_RULE },
244         { "Zone",       LC_ZONE },
245         { "Link",       LC_LINK },
246         { "Leap",       LC_LEAP },
247         { NULL,         0}
248 };
249
250 static struct lookup const      mon_names[] = {
251         { "January",    TM_JANUARY },
252         { "February",   TM_FEBRUARY },
253         { "March",      TM_MARCH },
254         { "April",      TM_APRIL },
255         { "May",        TM_MAY },
256         { "June",       TM_JUNE },
257         { "July",       TM_JULY },
258         { "August",     TM_AUGUST },
259         { "September",  TM_SEPTEMBER },
260         { "October",    TM_OCTOBER },
261         { "November",   TM_NOVEMBER },
262         { "December",   TM_DECEMBER },
263         { NULL,         0 }
264 };
265
266 static struct lookup const      wday_names[] = {
267         { "Sunday",     TM_SUNDAY },
268         { "Monday",     TM_MONDAY },
269         { "Tuesday",    TM_TUESDAY },
270         { "Wednesday",  TM_WEDNESDAY },
271         { "Thursday",   TM_THURSDAY },
272         { "Friday",     TM_FRIDAY },
273         { "Saturday",   TM_SATURDAY },
274         { NULL,         0 }
275 };
276
277 static struct lookup const      lasts[] = {
278         { "last-Sunday",        TM_SUNDAY },
279         { "last-Monday",        TM_MONDAY },
280         { "last-Tuesday",       TM_TUESDAY },
281         { "last-Wednesday",     TM_WEDNESDAY },
282         { "last-Thursday",      TM_THURSDAY },
283         { "last-Friday",        TM_FRIDAY },
284         { "last-Saturday",      TM_SATURDAY },
285         { NULL,                 0 }
286 };
287
288 static struct lookup const      begin_years[] = {
289         { "minimum",    YR_MINIMUM },
290         { "maximum",    YR_MAXIMUM },
291         { NULL,         0 }
292 };
293
294 static struct lookup const      end_years[] = {
295         { "minimum",    YR_MINIMUM },
296         { "maximum",    YR_MAXIMUM },
297         { "only",       YR_ONLY },
298         { NULL,         0 }
299 };
300
301 static struct lookup const      leap_types[] = {
302         { "Rolling",    TRUE },
303         { "Stationary", FALSE },
304         { NULL,         0 }
305 };
306
307 static const int        len_months[2][MONSPERYEAR] = {
308         { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
309         { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
310 };
311
312 static const int        len_years[2] = {
313         DAYSPERNYEAR, DAYSPERLYEAR
314 };
315
316 static time_t           ats[TZ_MAX_TIMES];
317 static unsigned char    types[TZ_MAX_TIMES];
318 static long             gmtoffs[TZ_MAX_TYPES];
319 static char             isdsts[TZ_MAX_TYPES];
320 static unsigned char    abbrinds[TZ_MAX_TYPES];
321 static char             ttisstds[TZ_MAX_TYPES];
322 static char             chars[TZ_MAX_CHARS];
323 static time_t           trans[TZ_MAX_LEAPS];
324 static long             corr[TZ_MAX_LEAPS];
325 static char             roll[TZ_MAX_LEAPS];
326
327 /*
328 ** Memory allocation.
329 */
330
331 static char *
332 memcheck(ptr)
333 char * const    ptr;
334 {
335         if (ptr == NULL) {
336                 (void) perror(progname);
337                 (void) exit(EXIT_FAILURE);
338         }
339         return ptr;
340 }
341
342 #define emalloc(size)           memcheck(imalloc(size))
343 #define erealloc(ptr, size)     memcheck(irealloc(ptr, size))
344 #define ecpyalloc(ptr)          memcheck(icpyalloc(ptr))
345 #define ecatalloc(oldp, newp)   memcheck(icatalloc(oldp, newp))
346
347 /*
348 ** Error handling.
349 */
350
351 static void
352 eats(name, num, rname, rnum)
353 const char * const      name;
354 const int               num;
355 const char * const      rname;
356 const int               rnum;
357 {
358         filename = name;
359         linenum = num;
360         rfilename = rname;
361         rlinenum = rnum;
362 }
363
364 static void
365 eat(name, num)
366 const char * const      name;
367 const int               num;
368 {
369         eats(name, num, (char *) NULL, -1);
370 }
371
372 static void
373 error(string)
374 const char * const      string;
375 {
376         /*
377         ** Match the format of "cc" to allow sh users to
378         **      zic ... 2>&1 | error -t "*" -v
379         ** on BSD systems.
380         */
381         (void) fprintf(stderr, "\"%s\", line %d: %s",
382                 filename, linenum, string);
383         if (rfilename != NULL)
384                 (void) fprintf(stderr, " (rule from \"%s\", line %d)",
385                         rfilename, rlinenum);
386         (void) fprintf(stderr, "\n");
387         ++errors;
388 }
389
390 static void
391 usage()
392 {
393         (void) fprintf(stderr,
394 "%s: usage is %s [ -s ] [ -v ] [ -l localtime ] [ -p posixrules ] [ -d directory ] \n\
395 \t[ -L leapseconds ] [ -y yearistype ] [ filename ... ]\n",
396                 progname, progname);
397         (void) exit(EXIT_FAILURE);
398 }
399
400 static const char *     psxrules;
401 static const char *     lcltime;
402 static const char *     directory;
403 static const char *     leapsec;
404 static const char *     yitcommand;
405 static int              sflag = FALSE;
406
407 int
408 main(argc, argv)
409 int     argc;
410 char *  argv[];
411 {
412         register int    i, j;
413         register int    c;
414
415 #ifdef unix
416         (void) umask(umask(022) | 022);
417 #endif /* defined unix */
418         progname = argv[0];
419         while ((c = getopt(argc, argv, "d:l:p:L:vsy:")) != EOF)
420                 switch (c) {
421                         default:
422                                 usage();
423                         case 'd':
424                                 if (directory == NULL)
425                                         directory = optarg;
426                                 else {
427                                         (void) fprintf(stderr,
428 "%s: More than one -d option specified\n",
429                                                 progname);
430                                         (void) exit(EXIT_FAILURE);
431                                 }
432                                 break;
433                         case 'l':
434                                 if (lcltime == NULL)
435                                         lcltime = optarg;
436                                 else {
437                                         (void) fprintf(stderr,
438 "%s: More than one -l option specified\n",
439                                                 progname);
440                                         (void) exit(EXIT_FAILURE);
441                                 }
442                                 break;
443                         case 'p':
444                                 if (psxrules == NULL)
445                                         psxrules = optarg;
446                                 else {
447                                         (void) fprintf(stderr,
448 "%s: More than one -p option specified\n",
449                                                 progname);
450                                         (void) exit(EXIT_FAILURE);
451                                 }
452                                 break;
453                         case 'y':
454                                 if (yitcommand == NULL)
455                                         yitcommand = optarg;
456                                 else {
457                                         (void) fprintf(stderr,
458 "%s: More than one -y option specified\n",
459                                                 progname);
460                                         (void) exit(EXIT_FAILURE);
461                                 }
462                                 break;
463                         case 'L':
464                                 if (leapsec == NULL)
465                                         leapsec = optarg;
466                                 else {
467                                         (void) fprintf(stderr,
468 "%s: More than one -L option specified\n",
469                                                 progname);
470                                         (void) exit(EXIT_FAILURE);
471                                 }
472                                 break;
473                         case 'v':
474                                 noise = TRUE;
475                                 break;
476                         case 's':
477                                 sflag = TRUE;
478                                 break;
479                 }
480         if (optind == argc - 1 && strcmp(argv[optind], "=") == 0)
481                 usage();        /* usage message by request */
482         if (directory == NULL)
483                 directory = TZDIR;
484         if (yitcommand == NULL)
485                 yitcommand = "yearistype";
486
487         setboundaries();
488
489         if (optind < argc && leapsec != NULL) {
490                 infile(leapsec);
491                 adjleap();
492         }
493
494         zones = (struct zone *) emalloc(0);
495         rules = (struct rule *) emalloc(0);
496         links = (struct link *) emalloc(0);
497         for (i = optind; i < argc; ++i)
498                 infile(argv[i]);
499         if (errors)
500                 (void) exit(EXIT_FAILURE);
501         associate();
502         for (i = 0; i < nzones; i = j) {
503                 /*
504                 ** Find the next non-continuation zone entry.
505                 */
506                 for (j = i + 1; j < nzones && zones[j].z_name == NULL; ++j)
507                         continue;
508                 outzone(&zones[i], j - i);
509         }
510         /*
511         ** Make links.
512         */
513         for (i = 0; i < nlinks; ++i)
514                 dolink(links[i].l_from, links[i].l_to);
515         if (lcltime != NULL)
516                 dolink(lcltime, TZDEFAULT);
517         if (psxrules != NULL)
518                 dolink(psxrules, TZDEFRULES);
519         return (errors == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
520 }
521
522 static void
523 dolink(fromfile, tofile)
524 const char * const      fromfile;
525 const char * const      tofile;
526 {
527         register char * fromname;
528         register char * toname;
529
530         if (fromfile[0] == '/')
531                 fromname = fromfile;
532         else {
533                 fromname = ecpyalloc(directory);
534                 fromname = ecatalloc(fromname, "/");
535                 fromname = ecatalloc(fromname, fromfile);
536         }
537         if (tofile[0] == '/')
538                 toname = tofile;
539         else {
540                 toname = ecpyalloc(directory);
541                 toname = ecatalloc(toname, "/");
542                 toname = ecatalloc(toname, tofile);
543         }
544         /*
545         ** We get to be careful here since
546         ** there's a fair chance of root running us.
547         */
548         if (!itsdir(toname))
549                 (void) remove(toname);
550         if (link(fromname, toname) != 0) {
551                 if (mkdirs(toname) != 0)
552                         (void) exit(EXIT_FAILURE);
553                 if (link(fromname, toname) != 0) {
554                         (void) fprintf(stderr, "%s: Can't link from %s to ",
555                                 progname, fromname);
556                         (void) perror(toname);
557                         (void) exit(EXIT_FAILURE);
558                 }
559         }
560         if (fromname != fromfile)
561                 ifree(fromname);
562         if (toname != tofile)
563                 ifree(toname);
564 }
565
566 static void
567 setboundaries()
568 {
569         register time_t bit;
570         register int bii;
571
572         for (bit = 1; bit > 0; bit <<= 1)
573                 continue;
574         if (bit == 0) {         /* time_t is an unsigned type */
575                 tt_signed = FALSE;
576                 min_time = 0;
577                 max_time = ~(time_t) 0;
578                 if (sflag)
579                         max_time >>= 1;
580         } else {
581                 tt_signed = TRUE;
582                 min_time = bit;
583                 max_time = bit;
584                 ++max_time;
585                 max_time = -max_time;
586                 if (sflag)
587                         min_time = 0;
588         }
589         min_year = TM_YEAR_BASE + gmtime(&min_time)->tm_year;
590         max_year = TM_YEAR_BASE + gmtime(&max_time)->tm_year;
591
592         for (bii = 1; bii > 0; bii <<= 1)
593                 continue;
594         min_int = bii;
595         max_int = -1 - bii;
596 }
597
598 static int
599 itsdir(name)
600 const char * const      name;
601 {
602         register char * myname;
603         register int    accres;
604
605         myname = ecpyalloc(name);
606         myname = ecatalloc(myname, "/.");
607         accres = access(myname, 0);
608         ifree(myname);
609         return accres == 0;
610 }
611
612 /*
613 ** Associate sets of rules with zones.
614 */
615
616 /*
617 ** Sort by rule name.
618 */
619
620 static int
621 rcomp(cp1, cp2)
622 const genericptr_t      cp1;
623 const genericptr_t      cp2;
624 {
625         return strcmp(((struct rule *) cp1)->r_name,
626                 ((struct rule *) cp2)->r_name);
627 }
628
629 static void
630 associate()
631 {
632         register struct zone *  zp;
633         register struct rule *  rp;
634         register int            base, out;
635         register int            i;
636
637         if (nrules != 0)
638                 (void) qsort((genericptr_t) rules,
639                         (qsort_size_t) nrules,
640                         (qsort_size_t) sizeof *rules, rcomp);
641         for (i = 0; i < nzones; ++i) {
642                 zp = &zones[i];
643                 zp->z_rules = NULL;
644                 zp->z_nrules = 0;
645         }
646         for (base = 0; base < nrules; base = out) {
647                 rp = &rules[base];
648                 for (out = base + 1; out < nrules; ++out)
649                         if (strcmp(rp->r_name, rules[out].r_name) != 0)
650                                 break;
651                 for (i = 0; i < nzones; ++i) {
652                         zp = &zones[i];
653                         if (strcmp(zp->z_rule, rp->r_name) != 0)
654                                 continue;
655                         zp->z_rules = rp;
656                         zp->z_nrules = out - base;
657                 }
658         }
659         for (i = 0; i < nzones; ++i) {
660                 zp = &zones[i];
661                 if (zp->z_nrules == 0) {
662                         /*
663                         ** Maybe we have a local standard time offset.
664                         */
665                         eat(zp->z_filename, zp->z_linenum);
666                         zp->z_stdoff = gethms(zp->z_rule, "unruly zone", TRUE);
667                         /*
668                         ** Note, though, that if there's no rule,
669                         ** a '%s' in the format is a bad thing.
670                         */
671                         if (strchr(zp->z_format, '%') != 0)
672                                 error("%s in ruleless zone");
673                 }
674         }
675         if (errors)
676                 (void) exit(EXIT_FAILURE);
677 }
678
679 static void
680 infile(name)
681 const char *    name;
682 {
683         register FILE *                 fp;
684         register char **                fields;
685         register char *                 cp;
686         register const struct lookup *  lp;
687         register int                    nfields;
688         register int                    wantcont;
689         register int                    num;
690         char                            buf[BUFSIZ];
691
692         if (strcmp(name, "-") == 0) {
693                 name = "standard input";
694                 fp = stdin;
695         } else if ((fp = fopen(name, "r")) == NULL) {
696                 (void) fprintf(stderr, "%s: Can't open ", progname);
697                 (void) perror(name);
698                 (void) exit(EXIT_FAILURE);
699         }
700         wantcont = FALSE;
701         for (num = 1; ; ++num) {
702                 eat(name, num);
703                 if (fgets(buf, (int) sizeof buf, fp) != buf)
704                         break;
705                 cp = strchr(buf, '\n');
706                 if (cp == NULL) {
707                         error("line too long");
708                         (void) exit(EXIT_FAILURE);
709                 }
710                 *cp = '\0';
711                 fields = getfields(buf);
712                 nfields = 0;
713                 while (fields[nfields] != NULL) {
714                         static char     nada[1];
715
716                         if (ciequal(fields[nfields], "-"))
717                                 fields[nfields] = nada;
718                         ++nfields;
719                 }
720                 if (nfields == 0) {
721                         /* nothing to do */
722                 } else if (wantcont) {
723                         wantcont = inzcont(fields, nfields);
724                 } else {
725                         lp = byword(fields[0], line_codes);
726                         if (lp == NULL)
727                                 error("input line of unknown type");
728                         else switch ((int) (lp->l_value)) {
729                                 case LC_RULE:
730                                         inrule(fields, nfields);
731                                         wantcont = FALSE;
732                                         break;
733                                 case LC_ZONE:
734                                         wantcont = inzone(fields, nfields);
735                                         break;
736                                 case LC_LINK:
737                                         inlink(fields, nfields);
738                                         wantcont = FALSE;
739                                         break;
740                                 case LC_LEAP:
741                                         if (name != leapsec)
742                                                 (void) fprintf(stderr,
743 "%s: Leap line in non leap seconds file %s\n",
744                                                         progname, name);
745                                         else    inleap(fields, nfields);
746                                         wantcont = FALSE;
747                                         break;
748                                 default:        /* "cannot happen" */
749                                         (void) fprintf(stderr,
750 "%s: panic: Invalid l_value %d\n",
751                                                 progname, lp->l_value);
752                                         (void) exit(EXIT_FAILURE);
753                         }
754                 }
755                 ifree((char *) fields);
756         }
757         if (ferror(fp)) {
758                 (void) fprintf(stderr, "%s: Error reading ", progname);
759                 (void) perror(filename);
760                 (void) exit(EXIT_FAILURE);
761         }
762         if (fp != stdin && fclose(fp)) {
763                 (void) fprintf(stderr, "%s: Error closing ", progname);
764                 (void) perror(filename);
765                 (void) exit(EXIT_FAILURE);
766         }
767         if (wantcont)
768                 error("expected continuation line not found");
769 }
770
771 /*
772 ** Convert a string of one of the forms
773 **      h       -h      hh:mm   -hh:mm  hh:mm:ss        -hh:mm:ss
774 ** into a number of seconds.
775 ** A null string maps to zero.
776 ** Call error with errstring and return zero on errors.
777 */
778
779 static long
780 gethms(string, errstring, signable)
781 const char *            string;
782 const char * const      errstring;
783 const int               signable;
784 {
785         int     hh, mm, ss, sign;
786
787         if (string == NULL || *string == '\0')
788                 return 0;
789         if (!signable)
790                 sign = 1;
791         else if (*string == '-') {
792                 sign = -1;
793                 ++string;
794         } else  sign = 1;
795         if (sscanf(string, scheck(string, "%d"), &hh) == 1)
796                 mm = ss = 0;
797         else if (sscanf(string, scheck(string, "%d:%d"), &hh, &mm) == 2)
798                 ss = 0;
799         else if (sscanf(string, scheck(string, "%d:%d:%d"),
800                 &hh, &mm, &ss) != 3) {
801                         error(errstring);
802                         return 0;
803         }
804         if (hh < 0 || hh >= HOURSPERDAY ||
805                 mm < 0 || mm >= MINSPERHOUR ||
806                 ss < 0 || ss > SECSPERMIN) {
807                         error(errstring);
808                         return 0;
809         }
810         return eitol(sign) *
811                 (eitol(hh * MINSPERHOUR + mm) *
812                 eitol(SECSPERMIN) + eitol(ss));
813 }
814
815 static void
816 inrule(fields, nfields)
817 register char ** const  fields;
818 const int               nfields;
819 {
820         static struct rule      r;
821
822         if (nfields != RULE_FIELDS) {
823                 error("wrong number of fields on Rule line");
824                 return;
825         }
826         if (*fields[RF_NAME] == '\0') {
827                 error("nameless rule");
828                 return;
829         }
830         r.r_filename = filename;
831         r.r_linenum = linenum;
832         r.r_stdoff = gethms(fields[RF_STDOFF], "invalid saved time", TRUE);
833         rulesub(&r, fields[RF_LOYEAR], fields[RF_HIYEAR], fields[RF_COMMAND],
834                 fields[RF_MONTH], fields[RF_DAY], fields[RF_TOD]);
835         r.r_name = ecpyalloc(fields[RF_NAME]);
836         r.r_abbrvar = ecpyalloc(fields[RF_ABBRVAR]);
837         rules = (struct rule *) erealloc((char *) rules,
838                 (int) ((nrules + 1) * sizeof *rules));
839         rules[nrules++] = r;
840 }
841
842 static int
843 inzone(fields, nfields)
844 register char ** const  fields;
845 const int               nfields;
846 {
847         register int    i;
848         static char *   buf;
849
850         if (nfields < ZONE_MINFIELDS || nfields > ZONE_MAXFIELDS) {
851                 error("wrong number of fields on Zone line");
852                 return FALSE;
853         }
854         if (strcmp(fields[ZF_NAME], TZDEFAULT) == 0 && lcltime != NULL) {
855                 buf = erealloc(buf, 132 + strlen(TZDEFAULT));
856                 (void) sprintf(buf,
857 "\"Zone %s\" line and -l option are mutually exclusive",
858                         TZDEFAULT);
859                 error(buf);
860                 return FALSE;
861         }
862         if (strcmp(fields[ZF_NAME], TZDEFRULES) == 0 && psxrules != NULL) {
863                 buf = erealloc(buf, 132 + strlen(TZDEFRULES));
864                 (void) sprintf(buf,
865 "\"Zone %s\" line and -p option are mutually exclusive",
866                         TZDEFRULES);
867                 error(buf);
868                 return FALSE;
869         }
870         for (i = 0; i < nzones; ++i)
871                 if (zones[i].z_name != NULL &&
872                         strcmp(zones[i].z_name, fields[ZF_NAME]) == 0) {
873                                 buf = erealloc(buf, 132 +
874                                         strlen(fields[ZF_NAME]) +
875                                         strlen(zones[i].z_filename));
876                                 (void) sprintf(buf,
877 "duplicate zone name %s (file \"%s\", line %d)",
878                                         fields[ZF_NAME],
879                                         zones[i].z_filename,
880                                         zones[i].z_linenum);
881                                 error(buf);
882                                 return FALSE;
883                 }
884         return inzsub(fields, nfields, FALSE);
885 }
886
887 static int
888 inzcont(fields, nfields)
889 register char ** const  fields;
890 const int               nfields;
891 {
892         if (nfields < ZONEC_MINFIELDS || nfields > ZONEC_MAXFIELDS) {
893                 error("wrong number of fields on Zone continuation line");
894                 return FALSE;
895         }
896         return inzsub(fields, nfields, TRUE);
897 }
898
899 static int
900 inzsub(fields, nfields, iscont)
901 register char ** const  fields;
902 const int               nfields;
903 const int               iscont;
904 {
905         register char *         cp;
906         static struct zone      z;
907         register int            i_gmtoff, i_rule, i_format;
908         register int            i_untilyear, i_untilmonth;
909         register int            i_untilday, i_untiltime;
910         register int            hasuntil;
911
912         if (iscont) {
913                 i_gmtoff = ZFC_GMTOFF;
914                 i_rule = ZFC_RULE;
915                 i_format = ZFC_FORMAT;
916                 i_untilyear = ZFC_TILYEAR;
917                 i_untilmonth = ZFC_TILMONTH;
918                 i_untilday = ZFC_TILDAY;
919                 i_untiltime = ZFC_TILTIME;
920                 z.z_name = NULL;
921         } else {
922                 i_gmtoff = ZF_GMTOFF;
923                 i_rule = ZF_RULE;
924                 i_format = ZF_FORMAT;
925                 i_untilyear = ZF_TILYEAR;
926                 i_untilmonth = ZF_TILMONTH;
927                 i_untilday = ZF_TILDAY;
928                 i_untiltime = ZF_TILTIME;
929                 z.z_name = ecpyalloc(fields[ZF_NAME]);
930         }
931         z.z_filename = filename;
932         z.z_linenum = linenum;
933         z.z_gmtoff = gethms(fields[i_gmtoff], "invalid GMT offset", TRUE);
934         if ((cp = strchr(fields[i_format], '%')) != 0) {
935                 if (*++cp != 's' || strchr(cp, '%') != 0) {
936                         error("invalid abbreviation format");
937                         return FALSE;
938                 }
939         }
940         z.z_rule = ecpyalloc(fields[i_rule]);
941         z.z_format = ecpyalloc(fields[i_format]);
942         hasuntil = nfields > i_untilyear;
943         if (hasuntil) {
944                 z.z_untilrule.r_filename = filename;
945                 z.z_untilrule.r_linenum = linenum;
946                 rulesub(&z.z_untilrule,
947                         fields[i_untilyear],
948                         "only",
949                         "",
950                         (nfields > i_untilmonth) ?
951                         fields[i_untilmonth] : "Jan",
952                         (nfields > i_untilday) ? fields[i_untilday] : "1",
953                         (nfields > i_untiltime) ? fields[i_untiltime] : "0");
954                 z.z_untiltime = rpytime(&z.z_untilrule,
955                         z.z_untilrule.r_loyear);
956                 if (iscont && nzones > 0 &&
957                         z.z_untiltime > min_time &&
958                         z.z_untiltime < max_time &&
959                         zones[nzones - 1].z_untiltime > min_time &&
960                         zones[nzones - 1].z_untiltime < max_time &&
961                         zones[nzones - 1].z_untiltime >= z.z_untiltime) {
962 error("Zone continuation line end time is not after end time of previous line");
963                                 return FALSE;
964                 }
965         }
966         zones = (struct zone *) erealloc((char *) zones,
967                 (int) ((nzones + 1) * sizeof *zones));
968         zones[nzones++] = z;
969         /*
970         ** If there was an UNTIL field on this line,
971         ** there's more information about the zone on the next line.
972         */
973         return hasuntil;
974 }
975
976 static void
977 inleap(fields, nfields)
978 register char ** const  fields;
979 const int               nfields;
980 {
981         register const char *           cp;
982         register const struct lookup *  lp;
983         register int                    i, j;
984         int                             year, month, day;
985         long                            dayoff, tod;
986         time_t                          t;
987
988         if (nfields != LEAP_FIELDS) {
989                 error("wrong number of fields on Leap line");
990                 return;
991         }
992         dayoff = 0;
993         cp = fields[LP_YEAR];
994         if (sscanf(cp, scheck(cp, "%d"), &year) != 1) {
995                         /*
996                          * Leapin' Lizards!
997                          */
998                         error("invalid leaping year");
999                         return;
1000         }
1001         j = EPOCH_YEAR;
1002         while (j != year) {
1003                 if (year > j) {
1004                         i = len_years[isleap(j)];
1005                         ++j;
1006                 } else {
1007                         --j;
1008                         i = -len_years[isleap(j)];
1009                 }
1010                 dayoff = oadd(dayoff, eitol(i));
1011         }
1012         if ((lp = byword(fields[LP_MONTH], mon_names)) == NULL) {
1013                 error("invalid month name");
1014                 return;
1015         }
1016         month = lp->l_value;
1017         j = TM_JANUARY;
1018         while (j != month) {
1019                 i = len_months[isleap(year)][j];
1020                 dayoff = oadd(dayoff, eitol(i));
1021                 ++j;
1022         }
1023         cp = fields[LP_DAY];
1024         if (sscanf(cp, scheck(cp, "%d"), &day) != 1 ||
1025                 day <= 0 || day > len_months[isleap(year)][month]) {
1026                         error("invalid day of month");
1027                         return;
1028         }
1029         dayoff = oadd(dayoff, eitol(day - 1));
1030         if (dayoff < 0 && !tt_signed) {
1031                 error("time before zero");
1032                 return;
1033         }
1034         t = (time_t) dayoff * SECSPERDAY;
1035         /*
1036         ** Cheap overflow check.
1037         */
1038         if (t / SECSPERDAY != dayoff) {
1039                 error("time overflow");
1040                 return;
1041         }
1042         tod = gethms(fields[LP_TIME], "invalid time of day", FALSE);
1043         cp = fields[LP_CORR];
1044         {
1045                 register int    positive;
1046                 int             count;
1047
1048                 if (strcmp(cp, "") == 0) { /* infile() turns "-" into "" */
1049                         positive = FALSE;
1050                         count = 1;
1051                 } else if (strcmp(cp, "--") == 0) {
1052                         positive = FALSE;
1053                         count = 2;
1054                 } else if (strcmp(cp, "+") == 0) {
1055                         positive = TRUE;
1056                         count = 1;
1057                 } else if (strcmp(cp, "++") == 0) {
1058                         positive = TRUE;
1059                         count = 2;
1060                 } else {
1061                         error("illegal CORRECTION field on Leap line");
1062                         return;
1063                 }
1064                 if ((lp = byword(fields[LP_ROLL], leap_types)) == NULL) {
1065                         error("illegal Rolling/Stationary field on Leap line");
1066                         return;
1067                 }
1068                 leapadd(tadd(t, tod), positive, lp->l_value, count);
1069         }
1070 }
1071
1072 static void
1073 inlink(fields, nfields)
1074 register char ** const  fields;
1075 const int               nfields;
1076 {
1077         struct link     l;
1078
1079         if (nfields != LINK_FIELDS) {
1080                 error("wrong number of fields on Link line");
1081                 return;
1082         }
1083         if (*fields[LF_FROM] == '\0') {
1084                 error("blank FROM field on Link line");
1085                 return;
1086         }
1087         if (*fields[LF_TO] == '\0') {
1088                 error("blank TO field on Link line");
1089                 return;
1090         }
1091         l.l_filename = filename;
1092         l.l_linenum = linenum;
1093         l.l_from = ecpyalloc(fields[LF_FROM]);
1094         l.l_to = ecpyalloc(fields[LF_TO]);
1095         links = (struct link *) erealloc((char *) links,
1096                 (int) ((nlinks + 1) * sizeof *links));
1097         links[nlinks++] = l;
1098 }
1099
1100 static void
1101 rulesub(rp, loyearp, hiyearp, typep, monthp, dayp, timep)
1102 register struct rule * const    rp;
1103 char * const                    loyearp;
1104 char * const                    hiyearp;
1105 char * const                    typep;
1106 char * const                    monthp;
1107 char * const                    dayp;
1108 char * const                    timep;
1109 {
1110         register struct lookup const *  lp;
1111         register char *                 cp;
1112
1113         if ((lp = byword(monthp, mon_names)) == NULL) {
1114                 error("invalid month name");
1115                 return;
1116         }
1117         rp->r_month = lp->l_value;
1118         rp->r_todisstd = FALSE;
1119         cp = timep;
1120         if (*cp != '\0') {
1121                 cp += strlen(cp) - 1;
1122                 switch (lowerit(*cp)) {
1123                         case 's':
1124                                 rp->r_todisstd = TRUE;
1125                                 *cp = '\0';
1126                                 break;
1127                         case 'w':
1128                                 rp->r_todisstd = FALSE;
1129                                 *cp = '\0';
1130                                 break;
1131                 }
1132         }
1133         rp->r_tod = gethms(timep, "invalid time of day", FALSE);
1134         /*
1135         ** Year work.
1136         */
1137         cp = loyearp;
1138         if ((lp = byword(cp, begin_years)) != NULL) switch ((int) lp->l_value) {
1139                 case YR_MINIMUM:
1140                         rp->r_loyear = min_int;
1141                         break;
1142                 case YR_MAXIMUM:
1143                         rp->r_loyear = max_int;
1144                         break;
1145                 default:        /* "cannot happen" */
1146                         (void) fprintf(stderr,
1147                                 "%s: panic: Invalid l_value %d\n",
1148                                 progname, lp->l_value);
1149                         (void) exit(EXIT_FAILURE);
1150         } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_loyear) != 1) {
1151                 error("invalid starting year");
1152                 return;
1153         }
1154         cp = hiyearp;
1155         if ((lp = byword(cp, end_years)) != NULL) switch ((int) lp->l_value) {
1156                 case YR_MINIMUM:
1157                         rp->r_hiyear = min_int;
1158                         break;
1159                 case YR_MAXIMUM:
1160                         rp->r_hiyear = max_int;
1161                         break;
1162                 case YR_ONLY:
1163                         rp->r_hiyear = rp->r_loyear;
1164                         break;
1165                 default:        /* "cannot happen" */
1166                         (void) fprintf(stderr,
1167                                 "%s: panic: Invalid l_value %d\n",
1168                                 progname, lp->l_value);
1169                         (void) exit(EXIT_FAILURE);
1170         } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_hiyear) != 1) {
1171                 error("invalid ending year");
1172                 return;
1173         }
1174         if (rp->r_loyear > rp->r_hiyear) {
1175                 error("starting year greater than ending year");
1176                 return;
1177         }
1178         if (*typep == '\0')
1179                 rp->r_yrtype = NULL;
1180         else {
1181                 if (rp->r_loyear == rp->r_hiyear) {
1182                         error("typed single year");
1183                         return;
1184                 }
1185                 rp->r_yrtype = ecpyalloc(typep);
1186         }
1187         /*
1188         ** Day work.
1189         ** Accept things such as:
1190         **      1
1191         **      last-Sunday
1192         **      Sun<=20
1193         **      Sun>=7
1194         */
1195         if ((lp = byword(dayp, lasts)) != NULL) {
1196                 rp->r_dycode = DC_DOWLEQ;
1197                 rp->r_wday = lp->l_value;
1198                 rp->r_dayofmonth = len_months[1][rp->r_month];
1199         } else {
1200                 if ((cp = strchr(dayp, '<')) != 0)
1201                         rp->r_dycode = DC_DOWLEQ;
1202                 else if ((cp = strchr(dayp, '>')) != 0)
1203                         rp->r_dycode = DC_DOWGEQ;
1204                 else {
1205                         cp = dayp;
1206                         rp->r_dycode = DC_DOM;
1207                 }
1208                 if (rp->r_dycode != DC_DOM) {
1209                         *cp++ = 0;
1210                         if (*cp++ != '=') {
1211                                 error("invalid day of month");
1212                                 return;
1213                         }
1214                         if ((lp = byword(dayp, wday_names)) == NULL) {
1215                                 error("invalid weekday name");
1216                                 return;
1217                         }
1218                         rp->r_wday = lp->l_value;
1219                 }
1220                 if (sscanf(cp, scheck(cp, "%d"), &rp->r_dayofmonth) != 1 ||
1221                         rp->r_dayofmonth <= 0 ||
1222                         (rp->r_dayofmonth > len_months[1][rp->r_month])) {
1223                                 error("invalid day of month");
1224                                 return;
1225                 }
1226         }
1227 }
1228
1229 static void
1230 convert(val, buf)
1231 const long      val;
1232 char * const    buf;
1233 {
1234         register int    i;
1235         register long   shift;
1236
1237         for (i = 0, shift = 24; i < 4; ++i, shift -= 8)
1238                 buf[i] = val >> shift;
1239 }
1240
1241 static void
1242 puttzcode(val, fp)
1243 const long      val;
1244 FILE * const    fp;
1245 {
1246         char    buf[4];
1247
1248         convert(val, buf);
1249         (void) fwrite((genericptr_t) buf,
1250                 (fwrite_size_t) sizeof buf,
1251                 (fwrite_size_t) 1, fp);
1252 }
1253
1254 static void
1255 writezone(name)
1256 const char * const      name;
1257 {
1258         register FILE *         fp;
1259         register int            i, j;
1260         static char *           fullname;
1261         static struct tzhead    tzh;
1262
1263         fullname = erealloc(fullname,
1264                 strlen(directory) + 1 + strlen(name) + 1);
1265         (void) sprintf(fullname, "%s/%s", directory, name);
1266         if ((fp = fopen(fullname, "wb")) == NULL) {
1267                 if (mkdirs(fullname) != 0)
1268                         (void) exit(EXIT_FAILURE);
1269                 if ((fp = fopen(fullname, "wb")) == NULL) {
1270                         (void) fprintf(stderr, "%s: Can't create ", progname);
1271                         (void) perror(fullname);
1272                         (void) exit(EXIT_FAILURE);
1273                 }
1274         }
1275         convert(eitol(typecnt), tzh.tzh_ttisstdcnt);
1276         convert(eitol(leapcnt), tzh.tzh_leapcnt);
1277         convert(eitol(timecnt), tzh.tzh_timecnt);
1278         convert(eitol(typecnt), tzh.tzh_typecnt);
1279         convert(eitol(charcnt), tzh.tzh_charcnt);
1280         (void) fwrite((genericptr_t) &tzh,
1281                 (fwrite_size_t) sizeof tzh,
1282                 (fwrite_size_t) 1, fp);
1283         for (i = 0; i < timecnt; ++i) {
1284                 j = leapcnt;
1285                 while (--j >= 0)
1286                         if (ats[i] >= trans[j]) {
1287                                 ats[i] = tadd(ats[i], corr[j]);
1288                                 break;
1289                         }
1290                 puttzcode((long) ats[i], fp);
1291         }
1292         if (timecnt > 0)
1293                 (void) fwrite((genericptr_t) types,
1294                         (fwrite_size_t) sizeof types[0],
1295                         (fwrite_size_t) timecnt, fp);
1296         for (i = 0; i < typecnt; ++i) {
1297                 puttzcode((long) gmtoffs[i], fp);
1298                 (void) putc(isdsts[i], fp);
1299                 (void) putc(abbrinds[i], fp);
1300         }
1301         if (charcnt != 0)
1302                 (void) fwrite((genericptr_t) chars,
1303                         (fwrite_size_t) sizeof chars[0],
1304                         (fwrite_size_t) charcnt, fp);
1305         for (i = 0; i < leapcnt; ++i) {
1306                 if (roll[i]) {
1307                         if (timecnt == 0 || trans[i] < ats[0]) {
1308                                 j = 0;
1309                                 while (isdsts[j])
1310                                         if (++j >= typecnt) {
1311                                                 j = 0;
1312                                                 break;
1313                                         }
1314                         } else {
1315                                 j = 1;
1316                                 while (j < timecnt && trans[i] >= ats[j])
1317                                         ++j;
1318                                 j = types[j - 1];
1319                         }
1320                         puttzcode((long) tadd(trans[i], -gmtoffs[j]), fp);
1321                 } else  puttzcode((long) trans[i], fp);
1322                 puttzcode((long) corr[i], fp);
1323         }
1324         for (i = 0; i < typecnt; ++i)
1325                 (void) putc(ttisstds[i], fp);
1326         if (ferror(fp) || fclose(fp)) {
1327                 (void) fprintf(stderr, "%s: Write error on ", progname);
1328                 (void) perror(fullname);
1329                 (void) exit(EXIT_FAILURE);
1330         }
1331 }
1332
1333 static void
1334 outzone(zpfirst, zonecount)
1335 const struct zone * const       zpfirst;
1336 const int                       zonecount;
1337 {
1338         register const struct zone *    zp;
1339         register struct rule *          rp;
1340         register int                    i, j;
1341         register int                    usestart, useuntil;
1342         register time_t                 starttime, untiltime;
1343         register long                   gmtoff;
1344         register long                   stdoff;
1345         register int                    year;
1346         register long                   startoff;
1347         register int                    startisdst;
1348         register int                    startttisstd;
1349         register int                    type;
1350         char                            startbuf[BUFSIZ];
1351
1352         /*
1353         ** Now. . .finally. . .generate some useful data!
1354         */
1355         timecnt = 0;
1356         typecnt = 0;
1357         charcnt = 0;
1358         /*
1359         ** A guess that may well be corrected later.
1360         */
1361         stdoff = 0;
1362         /*
1363         ** Thanks to Earl Chew (earl@dnd.icp.nec.com.au)
1364         ** for noting the need to unconditionally initialize startttisstd.
1365         */
1366         startttisstd = FALSE;
1367 #ifdef lint
1368         starttime = 0;
1369 #endif /* defined lint */
1370         for (i = 0; i < zonecount; ++i) {
1371                 zp = &zpfirst[i];
1372                 usestart = i > 0 && (zp - 1)->z_untiltime > min_time;
1373                 useuntil = i < (zonecount - 1);
1374                 if (useuntil && zp->z_untiltime <= min_time)
1375                         continue;
1376                 gmtoff = zp->z_gmtoff;
1377                 eat(zp->z_filename, zp->z_linenum);
1378                 startisdst = -1;
1379                 if (zp->z_nrules == 0) {
1380                         stdoff = zp->z_stdoff;
1381                         (void) strcpy(startbuf, zp->z_format);
1382                         type = addtype(oadd(zp->z_gmtoff, stdoff),
1383                                 startbuf, stdoff != 0, startttisstd);
1384                         if (usestart)
1385                                 addtt(starttime, type);
1386                         else if (stdoff != 0)
1387                                 addtt(min_time, type);
1388                 } else for (year = min_year; year <= max_year; ++year) {
1389                         if (useuntil && year > zp->z_untilrule.r_hiyear)
1390                                 break;
1391                         /*
1392                         ** Mark which rules to do in the current year.
1393                         ** For those to do, calculate rpytime(rp, year);
1394                         */
1395                         for (j = 0; j < zp->z_nrules; ++j) {
1396                                 rp = &zp->z_rules[j];
1397                                 eats(zp->z_filename, zp->z_linenum,
1398                                         rp->r_filename, rp->r_linenum);
1399                                 rp->r_todo = year >= rp->r_loyear &&
1400                                                 year <= rp->r_hiyear &&
1401                                                 yearistype(year, rp->r_yrtype);
1402                                 if (rp->r_todo)
1403                                         rp->r_temp = rpytime(rp, year);
1404                         }
1405                         for ( ; ; ) {
1406                                 register int    k;
1407                                 register time_t jtime, ktime;
1408                                 register long   offset;
1409                                 char            buf[BUFSIZ];
1410
1411                                 if (useuntil) {
1412                                         /*
1413                                         ** Turn untiltime into GMT
1414                                         ** assuming the current gmtoff and
1415                                         ** stdoff values.
1416                                         */
1417                                         untiltime = tadd(zp->z_untiltime,
1418                                                 -gmtoff);
1419                                         if (!zp->z_untilrule.r_todisstd)
1420                                                 untiltime = tadd(untiltime,
1421                                                         -stdoff);
1422                                 }
1423                                 /*
1424                                 ** Find the rule (of those to do, if any)
1425                                 ** that takes effect earliest in the year.
1426                                 */
1427                                 k = -1;
1428 #ifdef lint
1429                                 ktime = 0;
1430 #endif /* defined lint */
1431                                 for (j = 0; j < zp->z_nrules; ++j) {
1432                                         rp = &zp->z_rules[j];
1433                                         if (!rp->r_todo)
1434                                                 continue;
1435                                         eats(zp->z_filename, zp->z_linenum,
1436                                                 rp->r_filename, rp->r_linenum);
1437                                         offset = gmtoff;
1438                                         if (!rp->r_todisstd)
1439                                                 offset = oadd(offset, stdoff);
1440                                         jtime = rp->r_temp;
1441                                         if (jtime == min_time ||
1442                                                 jtime == max_time)
1443                                                         continue;
1444                                         jtime = tadd(jtime, -offset);
1445                                         if (k < 0 || jtime < ktime) {
1446                                                 k = j;
1447                                                 ktime = jtime;
1448                                         }
1449                                 }
1450                                 if (k < 0)
1451                                         break;  /* go on to next year */
1452                                 rp = &zp->z_rules[k];
1453                                 rp->r_todo = FALSE;
1454                                 if (useuntil && ktime >= untiltime)
1455                                         break;
1456                                 if (usestart) {
1457                                     if (ktime < starttime) {
1458                                         stdoff = rp->r_stdoff;
1459                                         startoff = oadd(zp->z_gmtoff,
1460                                                 rp->r_stdoff);
1461                                         (void) sprintf(startbuf, zp->z_format,
1462                                                 rp->r_abbrvar);
1463                                         startisdst = rp->r_stdoff != 0;
1464                                         continue;
1465                                     }
1466                                     usestart = FALSE;
1467                                     if (ktime != starttime) {
1468                                         if (startisdst < 0 &&
1469                                             zp->z_gmtoff !=
1470                                             (zp - 1)->z_gmtoff) {
1471                                                 type = (timecnt == 0) ? 0 :
1472                                                         types[timecnt - 1];
1473                                                 startoff = oadd(gmtoffs[type],
1474                                                         -(zp - 1)->z_gmtoff);
1475                                                 startisdst = startoff != 0;
1476                                                 startoff = oadd(startoff,
1477                                                         zp->z_gmtoff);
1478                                                 (void) strcpy(startbuf,
1479                                                         &chars[abbrinds[type]]);
1480                                         }
1481                                         if (startisdst >= 0)
1482 addtt(starttime, addtype(startoff, startbuf, startisdst, startttisstd));
1483                                     }
1484                                 }
1485                                 eats(zp->z_filename, zp->z_linenum,
1486                                         rp->r_filename, rp->r_linenum);
1487                                 (void) sprintf(buf, zp->z_format,
1488                                         rp->r_abbrvar);
1489                                 offset = oadd(zp->z_gmtoff, rp->r_stdoff);
1490                                 type = addtype(offset, buf, rp->r_stdoff != 0,
1491                                         rp->r_todisstd);
1492                                 addtt(ktime, type);
1493                                 stdoff = rp->r_stdoff;
1494                         }
1495                 }
1496                 /*
1497                 ** Now we may get to set starttime for the next zone line.
1498                 */
1499                 if (useuntil) {
1500                         starttime = tadd(zp->z_untiltime, -gmtoff);
1501                         startttisstd = zp->z_untilrule.r_todisstd;
1502                         if (!startttisstd)
1503                                 starttime = tadd(starttime, -stdoff);
1504                 }
1505         }
1506         writezone(zpfirst->z_name);
1507 }
1508
1509 static void
1510 addtt(starttime, type)
1511 const time_t    starttime;
1512 const int       type;
1513 {
1514         if (timecnt != 0 && type == types[timecnt - 1])
1515                 return; /* easy enough! */
1516         if (timecnt == 0 && type == 0 && isdsts[0] == 0)
1517                 return; /* handled by default rule */
1518         if (timecnt >= TZ_MAX_TIMES) {
1519                 error("too many transitions?!");
1520                 (void) exit(EXIT_FAILURE);
1521         }
1522         ats[timecnt] = starttime;
1523         types[timecnt] = type;
1524         ++timecnt;
1525 }
1526
1527 static int
1528 addtype(gmtoff, abbr, isdst, ttisstd)
1529 const long              gmtoff;
1530 const char * const      abbr;
1531 const int               isdst;
1532 const int               ttisstd;
1533 {
1534         register int    i, j;
1535
1536         /*
1537         ** See if there's already an entry for this zone type.
1538         ** If so, just return its index.
1539         */
1540         for (i = 0; i < typecnt; ++i) {
1541                 if (gmtoff == gmtoffs[i] && isdst == isdsts[i] &&
1542                         strcmp(abbr, &chars[abbrinds[i]]) == 0 &&
1543                         ttisstd == ttisstds[i])
1544                                 return i;
1545         }
1546         /*
1547         ** There isn't one; add a new one, unless there are already too
1548         ** many.
1549         */
1550         if (typecnt >= TZ_MAX_TYPES) {
1551                 error("too many local time types");
1552                 (void) exit(EXIT_FAILURE);
1553         }
1554         gmtoffs[i] = gmtoff;
1555         isdsts[i] = isdst;
1556         ttisstds[i] = ttisstd;
1557
1558         for (j = 0; j < charcnt; ++j)
1559                 if (strcmp(&chars[j], abbr) == 0)
1560                         break;
1561         if (j == charcnt)
1562                 newabbr(abbr);
1563         abbrinds[i] = j;
1564         ++typecnt;
1565         return i;
1566 }
1567
1568 static void
1569 leapadd(t, positive, rolling, count)
1570 const time_t    t;
1571 const int       positive;
1572 const int       rolling;
1573 int             count;
1574 {
1575         register int    i, j;
1576
1577         if (leapcnt + (positive ? count : 1) > TZ_MAX_LEAPS) {
1578                 error("too many leap seconds");
1579                 (void) exit(EXIT_FAILURE);
1580         }
1581         for (i = 0; i < leapcnt; ++i)
1582                 if (t <= trans[i]) {
1583                         if (t == trans[i]) {
1584                                 error("repeated leap second moment");
1585                                 (void) exit(EXIT_FAILURE);
1586                         }
1587                         break;
1588                 }
1589         do {
1590                 for (j = leapcnt; j > i; --j) {
1591                         trans[j] = trans[j - 1];
1592                         corr[j] = corr[j - 1];
1593                         roll[j] = roll[j - 1];
1594                 }
1595                 trans[i] = t;
1596                 corr[i] = positive ? 1L : eitol(-count);
1597                 roll[i] = rolling;
1598                 ++leapcnt;
1599         } while (positive && --count != 0);
1600 }
1601
1602 static void
1603 adjleap()
1604 {
1605         register int    i;
1606         register long   last = 0;
1607
1608         /*
1609         ** propagate leap seconds forward
1610         */
1611         for (i = 0; i < leapcnt; ++i) {
1612                 trans[i] = tadd(trans[i], last);
1613                 last = corr[i] += last;
1614         }
1615 }
1616
1617 static int
1618 yearistype(year, type)
1619 const int               year;
1620 const char * const      type;
1621 {
1622         static char *   buf;
1623         int             result;
1624
1625         if (type == NULL || *type == '\0')
1626                 return TRUE;
1627         if (strcmp(type, "uspres") == 0)
1628                 return (year % 4) == 0;
1629         if (strcmp(type, "nonpres") == 0)
1630                 return (year % 4) != 0;
1631         buf = erealloc(buf, 132 + strlen(yitcommand) + strlen(type));
1632         (void) sprintf(buf, "%s %d %s", yitcommand, year, type);
1633         result = system(buf);
1634         if (result == 0)
1635                 return TRUE;
1636         if (result == (1 << 8))
1637                 return FALSE;
1638         error("Wild result from command execution");
1639         (void) fprintf(stderr, "%s: command was '%s', result was %d\n",
1640                 progname, buf, result);
1641         for ( ; ; )
1642                 (void) exit(EXIT_FAILURE);
1643 }
1644
1645 static int
1646 lowerit(a)
1647 const int       a;
1648 {
1649         return (isascii(a) && isupper(a)) ? tolower(a) : a;
1650 }
1651
1652 static int
1653 ciequal(ap, bp)         /* case-insensitive equality */
1654 register const char *   ap;
1655 register const char *   bp;
1656 {
1657         while (lowerit(*ap) == lowerit(*bp++))
1658                 if (*ap++ == '\0')
1659                         return TRUE;
1660         return FALSE;
1661 }
1662
1663 static int
1664 itsabbr(abbr, word)
1665 register const char *   abbr;
1666 register const char *   word;
1667 {
1668         if (lowerit(*abbr) != lowerit(*word))
1669                 return FALSE;
1670         ++word;
1671         while (*++abbr != '\0')
1672                 do if (*word == '\0')
1673                         return FALSE;
1674                                 while (lowerit(*word++) != lowerit(*abbr));
1675         return TRUE;
1676 }
1677
1678 static const struct lookup *
1679 byword(word, table)
1680 register const char * const             word;
1681 register const struct lookup * const    table;
1682 {
1683         register const struct lookup *  foundlp;
1684         register const struct lookup *  lp;
1685
1686         if (word == NULL || table == NULL)
1687                 return NULL;
1688         /*
1689         ** Look for exact match.
1690         */
1691         for (lp = table; lp->l_word != NULL; ++lp)
1692                 if (ciequal(word, lp->l_word))
1693                         return lp;
1694         /*
1695         ** Look for inexact match.
1696         */
1697         foundlp = NULL;
1698         for (lp = table; lp->l_word != NULL; ++lp)
1699                 if (itsabbr(word, lp->l_word))
1700                         if (foundlp == NULL)
1701                                 foundlp = lp;
1702                         else    return NULL;    /* multiple inexact matches */
1703         return foundlp;
1704 }
1705
1706 static char **
1707 getfields(cp)
1708 register char * cp;
1709 {
1710         register char *         dp;
1711         register char **        array;
1712         register int            nsubs;
1713
1714         if (cp == NULL)
1715                 return NULL;
1716         array = (char **) emalloc((int) ((strlen(cp) + 1) * sizeof *array));
1717         nsubs = 0;
1718         for ( ; ; ) {
1719                 while (isascii(*cp) && isspace(*cp))
1720                         ++cp;
1721                 if (*cp == '\0' || *cp == '#')
1722                         break;
1723                 array[nsubs++] = dp = cp;
1724                 do {
1725                         if ((*dp = *cp++) != '"')
1726                                 ++dp;
1727                         else while ((*dp = *cp++) != '"')
1728                                 if (*dp != '\0')
1729                                         ++dp;
1730                                 else    error("Odd number of quotation marks");
1731                 } while (*cp != '\0' && *cp != '#' &&
1732                         (!isascii(*cp) || !isspace(*cp)));
1733                 if (isascii(*cp) && isspace(*cp))
1734                         ++cp;
1735                 *dp = '\0';
1736         }
1737         array[nsubs] = NULL;
1738         return array;
1739 }
1740
1741 static long
1742 oadd(t1, t2)
1743 const long      t1;
1744 const long      t2;
1745 {
1746         register long   t;
1747
1748         t = t1 + t2;
1749         if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {
1750                 error("time overflow");
1751                 (void) exit(EXIT_FAILURE);
1752         }
1753         return t;
1754 }
1755
1756 static time_t
1757 tadd(t1, t2)
1758 const time_t    t1;
1759 const long      t2;
1760 {
1761         register time_t t;
1762
1763         if (t1 == max_time && t2 > 0)
1764                 return max_time;
1765         if (t1 == min_time && t2 < 0)
1766                 return min_time;
1767         t = t1 + t2;
1768         if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {
1769                 error("time overflow");
1770                 (void) exit(EXIT_FAILURE);
1771         }
1772         return t;
1773 }
1774
1775 /*
1776 ** Given a rule, and a year, compute the date - in seconds since January 1,
1777 ** 1970, 00:00 LOCAL time - in that year that the rule refers to.
1778 */
1779
1780 static time_t
1781 rpytime(rp, wantedy)
1782 register const struct rule * const      rp;
1783 register const int                      wantedy;
1784 {
1785         register int    y, m, i;
1786         register long   dayoff;                 /* with a nod to Margaret O. */
1787         register time_t t;
1788
1789         if (wantedy == min_int)
1790                 return min_time;
1791         if (wantedy == max_int)
1792                 return max_time;
1793         dayoff = 0;
1794         m = TM_JANUARY;
1795         y = EPOCH_YEAR;
1796         while (wantedy != y) {
1797                 if (wantedy > y) {
1798                         i = len_years[isleap(y)];
1799                         ++y;
1800                 } else {
1801                         --y;
1802                         i = -len_years[isleap(y)];
1803                 }
1804                 dayoff = oadd(dayoff, eitol(i));
1805         }
1806         while (m != rp->r_month) {
1807                 i = len_months[isleap(y)][m];
1808                 dayoff = oadd(dayoff, eitol(i));
1809                 ++m;
1810         }
1811         i = rp->r_dayofmonth;
1812         if (m == TM_FEBRUARY && i == 29 && !isleap(y)) {
1813                 if (rp->r_dycode == DC_DOWLEQ)
1814                         --i;
1815                 else {
1816                         error("use of 2/29 in non leap-year");
1817                         (void) exit(EXIT_FAILURE);
1818                 }
1819         }
1820         --i;
1821         dayoff = oadd(dayoff, eitol(i));
1822         if (rp->r_dycode == DC_DOWGEQ || rp->r_dycode == DC_DOWLEQ) {
1823                 register long   wday;
1824
1825 #define LDAYSPERWEEK    ((long) DAYSPERWEEK)
1826                 wday = eitol(EPOCH_WDAY);
1827                 /*
1828                 ** Don't trust mod of negative numbers.
1829                 */
1830                 if (dayoff >= 0)
1831                         wday = (wday + dayoff) % LDAYSPERWEEK;
1832                 else {
1833                         wday -= ((-dayoff) % LDAYSPERWEEK);
1834                         if (wday < 0)
1835                                 wday += LDAYSPERWEEK;
1836                 }
1837                 while (wday != eitol(rp->r_wday))
1838                         if (rp->r_dycode == DC_DOWGEQ) {
1839                                 dayoff = oadd(dayoff, (long) 1);
1840                                 if (++wday >= LDAYSPERWEEK)
1841                                         wday = 0;
1842                                 ++i;
1843                         } else {
1844                                 dayoff = oadd(dayoff, (long) -1);
1845                                 if (--wday < 0)
1846                                         wday = LDAYSPERWEEK - 1;
1847                                 --i;
1848                         }
1849                 if (i < 0 || i >= len_months[isleap(y)][m]) {
1850                         error("no day in month matches rule");
1851                         (void) exit(EXIT_FAILURE);
1852                 }
1853         }
1854         if (dayoff < 0 && !tt_signed)
1855                 return min_time;
1856         t = (time_t) dayoff * SECSPERDAY;
1857         /*
1858         ** Cheap overflow check.
1859         */
1860         if (t / SECSPERDAY != dayoff)
1861                 return (dayoff > 0) ? max_time : min_time;
1862         return tadd(t, rp->r_tod);
1863 }
1864
1865 static void
1866 newabbr(string)
1867 const char * const      string;
1868 {
1869         register int    i;
1870
1871         i = strlen(string) + 1;
1872         if (charcnt + i > TZ_MAX_CHARS) {
1873                 error("too many, or too long, time zone abbreviations");
1874                 (void) exit(EXIT_FAILURE);
1875         }
1876         (void) strcpy(&chars[charcnt], string);
1877         charcnt += eitol(i);
1878 }
1879
1880 static int
1881 mkdirs(argname)
1882 char * const    argname;
1883 {
1884         register char * name;
1885         register char * cp;
1886
1887         if (argname == NULL || *argname == '\0')
1888                 return 0;
1889         cp = name = ecpyalloc(argname);
1890         while ((cp = strchr(cp + 1, '/')) != 0) {
1891                 *cp = '\0';
1892 #ifndef unix
1893                 /*
1894                 ** MS-DOS drive specifier?
1895                 */
1896                 if (strlen(name) == 2 && isascii(name[0]) &&
1897                         isalpha(name[0]) && name[1] == ':') {
1898                                 *cp = '/';
1899                                 continue;
1900                 }
1901 #endif /* !defined unix */
1902                 if (!itsdir(name)) {
1903                         /*
1904                         ** It doesn't seem to exist, so we try to create it.
1905                         */
1906                         if (emkdir(name, 0755) != 0) {
1907                                 (void) fprintf(stderr,
1908                                         "%s: Can't create directory ",
1909                                         progname);
1910                                 (void) perror(name);
1911                                 ifree(name);
1912                                 return -1;
1913                         }
1914                 }
1915                 *cp = '/';
1916         }
1917         ifree(name);
1918         return 0;
1919 }
1920
1921 static long
1922 eitol(i)
1923 const int       i;
1924 {
1925         long    l;
1926
1927         l = i;
1928         if ((i < 0 && l >= 0) || (i == 0 && l != 0) || (i > 0 && l <= 0)) {
1929                 (void) fprintf(stderr,
1930                         "%s: %d did not sign extend correctly\n",
1931                         progname, i);
1932                 (void) exit(EXIT_FAILURE);
1933         }
1934         return l;
1935 }
1936
1937 /*
1938 ** UNIX is a registered trademark of AT&T.
1939 */