Update from tzdata1999e and tzcode1999e.
[kopensolaris-gnu/glibc.git] / timezone / zic.c
1 #ifndef lint
2 #ifndef NOID
3 static char    elsieid[] = "@(#)zic.c  7.100";
4 #endif /* !defined NOID */
5 #endif /* !defined lint */
6
7 #include "private.h"
8 #include "locale.h"
9 #include "tzfile.h"
10 #ifdef unix
11 #include "sys/stat.h"                   /* for umask manifest constants */
12 #endif /* defined unix */
13
14 #include <libintl.h>
15
16 /*
17 ** On some ancient hosts, predicates like `isspace(C)' are defined
18 ** only if isascii(C) || C == EOF.  Modern hosts obey the C Standard,
19 ** which says they are defined only if C == ((unsigned char) C) || C == EOF.
20 ** Neither the C Standard nor Posix require that `isascii' exist.
21 ** For portability, we check both ancient and modern requirements.
22 ** If isascii is not defined, the isascii check succeeds trivially.
23 */
24 #include "ctype.h"
25 #ifndef isascii
26 #define isascii(x) 1
27 #endif
28
29 struct rule {
30         const char *    r_filename;
31         int             r_linenum;
32         const char *    r_name;
33
34         int             r_loyear;       /* for example, 1986 */
35         int             r_hiyear;       /* for example, 1986 */
36         const char *    r_yrtype;
37
38         int             r_month;        /* 0..11 */
39
40         int             r_dycode;       /* see below */
41         int             r_dayofmonth;
42         int             r_wday;
43
44         long            r_tod;          /* time from midnight */
45         int             r_todisstd;     /* above is standard time if TRUE */
46                                         /* or wall clock time if FALSE */
47         int             r_todisgmt;     /* above is GMT if TRUE */
48                                         /* or local time if FALSE */
49         long            r_stdoff;       /* offset from standard time */
50         const char *    r_abbrvar;      /* variable part of abbreviation */
51
52         int             r_todo;         /* a rule to do (used in outzone) */
53         time_t          r_temp;         /* used in outzone */
54 };
55
56 /*
57 **      r_dycode                r_dayofmonth    r_wday
58 */
59
60 #define DC_DOM          0       /* 1..31 */     /* unused */
61 #define DC_DOWGEQ       1       /* 1..31 */     /* 0..6 (Sun..Sat) */
62 #define DC_DOWLEQ       2       /* 1..31 */     /* 0..6 (Sun..Sat) */
63
64 struct zone {
65         const char *    z_filename;
66         int             z_linenum;
67
68         const char *    z_name;
69         long            z_gmtoff;
70         const char *    z_rule;
71         const char *    z_format;
72
73         long            z_stdoff;
74
75         struct rule *   z_rules;
76         int             z_nrules;
77
78         struct rule     z_untilrule;
79         time_t          z_untiltime;
80 };
81
82 extern int      getopt P((int argc, char * const argv[],
83                         const char * options));
84 extern int      link P((const char * fromname, const char * toname));
85 extern char *   optarg;
86 extern int      optind;
87
88 static void     addtt P((time_t starttime, int type));
89 static int      addtype P((long gmtoff, const char * abbr, int isdst,
90                                 int ttisstd, int ttisgmt));
91 static void     leapadd P((time_t t, int positive, int rolling, int count));
92 static void     adjleap P((void));
93 static void     associate P((void));
94 static int      ciequal P((const char * ap, const char * bp));
95 static void     convert P((long val, char * buf));
96 static void     dolink P((const char * fromfile, const char * tofile));
97 static void     doabbr P((char * abbr, const char * format,
98                         const char * letters, int isdst));
99 static void     eat P((const char * name, int num));
100 static void     eats P((const char * name, int num,
101                         const char * rname, int rnum));
102 static long     eitol P((int i));
103 static void     error P((const char * message));
104 static char **  getfields P((char * buf));
105 static long     gethms P((const char * string, const char * errstrng,
106                         int signable));
107 static void     infile P((const char * filename));
108 static void     inleap P((char ** fields, int nfields));
109 static void     inlink P((char ** fields, int nfields));
110 static void     inrule P((char ** fields, int nfields));
111 static int      inzcont P((char ** fields, int nfields));
112 static int      inzone P((char ** fields, int nfields));
113 static int      inzsub P((char ** fields, int nfields, int iscont));
114 static int      itsabbr P((const char * abbr, const char * word));
115 static int      itsdir P((const char * name));
116 static int      lowerit P((int c));
117 static char *   memcheck P((char * tocheck));
118 static int      mkdirs P((char * filename));
119 static void     newabbr P((const char * abbr));
120 static long     oadd P((long t1, long t2));
121 static void     outzone P((const struct zone * zp, int ntzones));
122 static void     puttzcode P((long code, FILE * fp));
123 static int      rcomp P((const void * leftp, const void * rightp));
124 static time_t   rpytime P((const struct rule * rp, int wantedy));
125 static void     rulesub P((struct rule * rp,
126                         const char * loyearp, const char * hiyearp,
127                         const char * typep, const char * monthp,
128                         const char * dayp, const char * timep));
129 static void     setboundaries P((void));
130 static time_t   tadd P((time_t t1, long t2));
131 static void     usage P((void));
132 static void     writezone P((const char * name));
133 static int      yearistype P((int year, const char * type));
134
135 #if !(HAVE_STRERROR - 0)
136 static char *   strerror P((int));
137 #endif /* !(HAVE_STRERROR - 0) */
138
139 static int              charcnt;
140 static int              errors;
141 static const char *     filename;
142 static int              leapcnt;
143 static int              linenum;
144 static time_t           max_time;
145 static int              max_year;
146 static int              max_year_representable;
147 static time_t           min_time;
148 static int              min_year;
149 static int              min_year_representable;
150 static int              noise;
151 static const char *     rfilename;
152 static int              rlinenum;
153 static const char *     progname;
154 static int              timecnt;
155 static int              typecnt;
156
157 /*
158 ** Line codes.
159 */
160
161 #define LC_RULE         0
162 #define LC_ZONE         1
163 #define LC_LINK         2
164 #define LC_LEAP         3
165
166 /*
167 ** Which fields are which on a Zone line.
168 */
169
170 #define ZF_NAME         1
171 #define ZF_GMTOFF       2
172 #define ZF_RULE         3
173 #define ZF_FORMAT       4
174 #define ZF_TILYEAR      5
175 #define ZF_TILMONTH     6
176 #define ZF_TILDAY       7
177 #define ZF_TILTIME      8
178 #define ZONE_MINFIELDS  5
179 #define ZONE_MAXFIELDS  9
180
181 /*
182 ** Which fields are which on a Zone continuation line.
183 */
184
185 #define ZFC_GMTOFF      0
186 #define ZFC_RULE        1
187 #define ZFC_FORMAT      2
188 #define ZFC_TILYEAR     3
189 #define ZFC_TILMONTH    4
190 #define ZFC_TILDAY      5
191 #define ZFC_TILTIME     6
192 #define ZONEC_MINFIELDS 3
193 #define ZONEC_MAXFIELDS 7
194
195 /*
196 ** Which files are which on a Rule line.
197 */
198
199 #define RF_NAME         1
200 #define RF_LOYEAR       2
201 #define RF_HIYEAR       3
202 #define RF_COMMAND      4
203 #define RF_MONTH        5
204 #define RF_DAY          6
205 #define RF_TOD          7
206 #define RF_STDOFF       8
207 #define RF_ABBRVAR      9
208 #define RULE_FIELDS     10
209
210 /*
211 ** Which fields are which on a Link line.
212 */
213
214 #define LF_FROM         1
215 #define LF_TO           2
216 #define LINK_FIELDS     3
217
218 /*
219 ** Which fields are which on a Leap line.
220 */
221
222 #define LP_YEAR         1
223 #define LP_MONTH        2
224 #define LP_DAY          3
225 #define LP_TIME         4
226 #define LP_CORR         5
227 #define LP_ROLL         6
228 #define LEAP_FIELDS     7
229
230 /*
231 ** Year synonyms.
232 */
233
234 #define YR_MINIMUM      0
235 #define YR_MAXIMUM      1
236 #define YR_ONLY         2
237
238 static struct rule *    rules;
239 static int              nrules; /* number of rules */
240
241 static struct zone *    zones;
242 static int              nzones; /* number of zones */
243
244 struct link {
245         const char *    l_filename;
246         int             l_linenum;
247         const char *    l_from;
248         const char *    l_to;
249 };
250
251 static struct link *    links;
252 static int              nlinks;
253
254 struct lookup {
255         const char *    l_word;
256         const int       l_value;
257 };
258
259 static struct lookup const *    byword P((const char * string,
260                                         const struct lookup * lp));
261
262 static struct lookup const      line_codes[] = {
263         { "Rule",       LC_RULE },
264         { "Zone",       LC_ZONE },
265         { "Link",       LC_LINK },
266         { "Leap",       LC_LEAP },
267         { NULL,         0}
268 };
269
270 static struct lookup const      mon_names[] = {
271         { "January",    TM_JANUARY },
272         { "February",   TM_FEBRUARY },
273         { "March",      TM_MARCH },
274         { "April",      TM_APRIL },
275         { "May",        TM_MAY },
276         { "June",       TM_JUNE },
277         { "July",       TM_JULY },
278         { "August",     TM_AUGUST },
279         { "September",  TM_SEPTEMBER },
280         { "October",    TM_OCTOBER },
281         { "November",   TM_NOVEMBER },
282         { "December",   TM_DECEMBER },
283         { NULL,         0 }
284 };
285
286 static struct lookup const      wday_names[] = {
287         { "Sunday",     TM_SUNDAY },
288         { "Monday",     TM_MONDAY },
289         { "Tuesday",    TM_TUESDAY },
290         { "Wednesday",  TM_WEDNESDAY },
291         { "Thursday",   TM_THURSDAY },
292         { "Friday",     TM_FRIDAY },
293         { "Saturday",   TM_SATURDAY },
294         { NULL,         0 }
295 };
296
297 static struct lookup const      lasts[] = {
298         { "last-Sunday",        TM_SUNDAY },
299         { "last-Monday",        TM_MONDAY },
300         { "last-Tuesday",       TM_TUESDAY },
301         { "last-Wednesday",     TM_WEDNESDAY },
302         { "last-Thursday",      TM_THURSDAY },
303         { "last-Friday",        TM_FRIDAY },
304         { "last-Saturday",      TM_SATURDAY },
305         { NULL,                 0 }
306 };
307
308 static struct lookup const      begin_years[] = {
309         { "minimum",    YR_MINIMUM },
310         { "maximum",    YR_MAXIMUM },
311         { NULL,         0 }
312 };
313
314 static struct lookup const      end_years[] = {
315         { "minimum",    YR_MINIMUM },
316         { "maximum",    YR_MAXIMUM },
317         { "only",       YR_ONLY },
318         { NULL,         0 }
319 };
320
321 static struct lookup const      leap_types[] = {
322         { "Rolling",    TRUE },
323         { "Stationary", FALSE },
324         { NULL,         0 }
325 };
326
327 static const int        len_months[2][MONSPERYEAR] = {
328         { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
329         { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
330 };
331
332 static const int        len_years[2] = {
333         DAYSPERNYEAR, DAYSPERLYEAR
334 };
335
336 static struct attype {
337         time_t          at;
338         unsigned char   type;
339 }                       attypes[TZ_MAX_TIMES];
340 static long             gmtoffs[TZ_MAX_TYPES];
341 static char             isdsts[TZ_MAX_TYPES];
342 static unsigned char    abbrinds[TZ_MAX_TYPES];
343 static char             ttisstds[TZ_MAX_TYPES];
344 static char             ttisgmts[TZ_MAX_TYPES];
345 static char             chars[TZ_MAX_CHARS];
346 static time_t           trans[TZ_MAX_LEAPS];
347 static long             corr[TZ_MAX_LEAPS];
348 static char             roll[TZ_MAX_LEAPS];
349
350 /*
351 ** Memory allocation.
352 */
353
354 static char *
355 memcheck(ptr)
356 char * const    ptr;
357 {
358         if (ptr == NULL) {
359                 const char *e = strerror(errno);
360
361                 (void) fprintf(stderr, _("%s: Memory exhausted: %s\n"),
362                         progname, e);
363                 (void) exit(EXIT_FAILURE);
364         }
365         return ptr;
366 }
367
368 #define emalloc(size)           memcheck(imalloc(size))
369 #define erealloc(ptr, size)     memcheck(irealloc((ptr), (size)))
370 #define ecpyalloc(ptr)          memcheck(icpyalloc(ptr))
371 #define ecatalloc(oldp, newp)   memcheck(icatalloc((oldp), (newp)))
372
373 /*
374 ** Error handling.
375 */
376
377 #if !(HAVE_STRERROR - 0)
378 static char *
379 strerror(errnum)
380 int     errnum;
381 {
382         extern char *   sys_errlist[];
383         extern int      sys_nerr;
384
385         return (errnum > 0 && errnum <= sys_nerr) ?
386                 sys_errlist[errnum] : _("Unknown system error");
387 }
388 #endif /* !(HAVE_STRERROR - 0) */
389
390 static void
391 eats(name, num, rname, rnum)
392 const char * const      name;
393 const int               num;
394 const char * const      rname;
395 const int               rnum;
396 {
397         filename = name;
398         linenum = num;
399         rfilename = rname;
400         rlinenum = rnum;
401 }
402
403 static void
404 eat(name, num)
405 const char * const      name;
406 const int               num;
407 {
408         eats(name, num, (char *) NULL, -1);
409 }
410
411 static void
412 error(string)
413 const char * const      string;
414 {
415         /*
416         ** Match the format of "cc" to allow sh users to
417         **      zic ... 2>&1 | error -t "*" -v
418         ** on BSD systems.
419         */
420         (void) fprintf(stderr, _("\"%s\", line %d: %s"),
421                 filename, linenum, string);
422         if (rfilename != NULL)
423                 (void) fprintf(stderr, _(" (rule from \"%s\", line %d)"),
424                         rfilename, rlinenum);
425         (void) fprintf(stderr, "\n");
426         ++errors;
427 }
428
429 static void
430 warning(string)
431 const char * const      string;
432 {
433         char *  cp;
434
435         cp = ecpyalloc(_("warning: "));
436         cp = ecatalloc(cp, string);
437         error(cp);
438         ifree(cp);
439         --errors;
440 }
441
442 static void
443 usage P((void))
444 {
445         (void) fprintf(stderr, _("%s: usage is %s [ -s ] [ -v ] [ -l localtime ] [ -p posixrules ] [ -d directory ]\n\t[ -L leapseconds ] [ -y yearistype ] [ filename ... ]\n"),
446                 progname, progname);
447         (void) exit(EXIT_FAILURE);
448 }
449
450 static const char *     psxrules;
451 static const char *     lcltime;
452 static const char *     directory;
453 static const char *     leapsec;
454 static const char *     yitcommand;
455 static int              sflag = FALSE;
456
457 int
458 main(argc, argv)
459 int     argc;
460 char *  argv[];
461 {
462         register int    i;
463         register int    j;
464         register int    c;
465
466 #ifdef unix
467         (void) umask(umask(S_IWGRP | S_IWOTH) | (S_IWGRP | S_IWOTH));
468 #endif /* defined unix */
469 #if HAVE_GETTEXT - 0
470         (void) setlocale(LC_MESSAGES, "");
471 #ifdef TZ_DOMAINDIR
472         (void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR);
473 #endif /* defined TEXTDOMAINDIR */
474         (void) textdomain(TZ_DOMAIN);
475 #endif /* HAVE_GETTEXT - 0 */
476         progname = argv[0];
477         while ((c = getopt(argc, argv, "d:l:p:L:vsy:")) != EOF && c != -1)
478                 switch (c) {
479                         default:
480                                 usage();
481                         case 'd':
482                                 if (directory == NULL)
483                                         directory = optarg;
484                                 else {
485                                         (void) fprintf(stderr,
486 _("%s: More than one -d option specified\n"),
487                                                 progname);
488                                         (void) exit(EXIT_FAILURE);
489                                 }
490                                 break;
491                         case 'l':
492                                 if (lcltime == NULL)
493                                         lcltime = optarg;
494                                 else {
495                                         (void) fprintf(stderr,
496 _("%s: More than one -l option specified\n"),
497                                                 progname);
498                                         (void) exit(EXIT_FAILURE);
499                                 }
500                                 break;
501                         case 'p':
502                                 if (psxrules == NULL)
503                                         psxrules = optarg;
504                                 else {
505                                         (void) fprintf(stderr,
506 _("%s: More than one -p option specified\n"),
507                                                 progname);
508                                         (void) exit(EXIT_FAILURE);
509                                 }
510                                 break;
511                         case 'y':
512                                 if (yitcommand == NULL)
513                                         yitcommand = optarg;
514                                 else {
515                                         (void) fprintf(stderr,
516 _("%s: More than one -y option specified\n"),
517                                                 progname);
518                                         (void) exit(EXIT_FAILURE);
519                                 }
520                                 break;
521                         case 'L':
522                                 if (leapsec == NULL)
523                                         leapsec = optarg;
524                                 else {
525                                         (void) fprintf(stderr,
526 _("%s: More than one -L option specified\n"),
527                                                 progname);
528                                         (void) exit(EXIT_FAILURE);
529                                 }
530                                 break;
531                         case 'v':
532                                 noise = TRUE;
533                                 break;
534                         case 's':
535                                 sflag = TRUE;
536                                 break;
537                 }
538         if (optind == argc - 1 && strcmp(argv[optind], "=") == 0)
539                 usage();        /* usage message by request */
540         if (directory == NULL)
541                 directory = TZDIR;
542         if (yitcommand == NULL)
543                 yitcommand = "yearistype";
544
545         setboundaries();
546
547         if (optind < argc && leapsec != NULL) {
548                 infile(leapsec);
549                 adjleap();
550         }
551
552         for (i = optind; i < argc; ++i)
553                 infile(argv[i]);
554         if (errors)
555                 (void) exit(EXIT_FAILURE);
556         associate();
557         for (i = 0; i < nzones; i = j) {
558                 /*
559                 ** Find the next non-continuation zone entry.
560                 */
561                 for (j = i + 1; j < nzones && zones[j].z_name == NULL; ++j)
562                         continue;
563                 outzone(&zones[i], j - i);
564         }
565         /*
566         ** Make links.
567         */
568         for (i = 0; i < nlinks; ++i) {
569                 eat(links[i].l_filename, links[i].l_linenum);
570                 dolink(links[i].l_from, links[i].l_to);
571         }
572         if (lcltime != NULL) {
573                 eat("command line", 1);
574                 dolink(lcltime, TZDEFAULT);
575         }
576         if (psxrules != NULL) {
577                 eat("command line", 1);
578                 dolink(psxrules, TZDEFRULES);
579         }
580         return (errors == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
581 }
582
583 static void
584 dolink(fromfile, tofile)
585 const char * const      fromfile;
586 const char * const      tofile;
587 {
588         register char * fromname;
589         register char * toname;
590
591         if (fromfile[0] == '/')
592                 fromname = ecpyalloc(fromfile);
593         else {
594                 fromname = ecpyalloc(directory);
595                 fromname = ecatalloc(fromname, "/");
596                 fromname = ecatalloc(fromname, fromfile);
597         }
598         if (tofile[0] == '/')
599                 toname = ecpyalloc(tofile);
600         else {
601                 toname = ecpyalloc(directory);
602                 toname = ecatalloc(toname, "/");
603                 toname = ecatalloc(toname, tofile);
604         }
605         /*
606         ** We get to be careful here since
607         ** there's a fair chance of root running us.
608         */
609         if (!itsdir(toname))
610                 (void) remove(toname);
611         if (link(fromname, toname) != 0) {
612                 int     result;
613
614                 if (mkdirs(toname) != 0)
615                         (void) exit(EXIT_FAILURE);
616
617                 result = link(fromname, toname);
618 #if (HAVE_SYMLINK - 0)
619                 if (result != 0) {
620                         const char *s = tofile;
621                         register char *symlinkcontents = NULL;
622                         while ((s = strchr(s+1, '/')) != NULL)
623                                 symlinkcontents = ecatalloc(symlinkcontents, "../");
624                         symlinkcontents = ecatalloc(symlinkcontents, fromname);
625
626                         result = unlink(toname);
627                         if (result != 0 && errno != ENOENT) {
628                                 const char *e = strerror(errno);
629
630                                 (void) fprintf(stderr,
631                                                _("%s: Can't unlink  %s: %s\n"),
632                                                progname, toname, e);
633                                 (void) exit(EXIT_FAILURE);
634                         }
635
636                         result = symlink(symlinkcontents, toname);
637                         if (result == 0)
638 warning(_("hard link failed, symbolic link used"));
639                         ifree(symlinkcontents);
640                 }
641 #endif
642                 if (result != 0) {
643                         const char *e = strerror(errno);
644
645                         (void) fprintf(stderr,
646                                 _("%s: Can't link from %s to %s: %s\n"),
647                                 progname, fromname, toname, e);
648                         (void) exit(EXIT_FAILURE);
649                 }
650         }
651         ifree(fromname);
652         ifree(toname);
653 }
654
655 #ifndef INT_MAX
656 #define INT_MAX ((int) (((unsigned)~0)>>1))
657 #endif /* !defined INT_MAX */
658
659 #ifndef INT_MIN
660 #define INT_MIN ((int) ~(((unsigned)~0)>>1))
661 #endif /* !defined INT_MIN */
662
663 /*
664 ** The tz file format currently allows at most 32-bit quantities.
665 ** This restriction should be removed before signed 32-bit values
666 ** wrap around in 2038, but unfortunately this will require a
667 ** change to the tz file format.
668 */
669
670 #define MAX_BITS_IN_FILE        32
671 #define TIME_T_BITS_IN_FILE     ((TYPE_BIT(time_t) < MAX_BITS_IN_FILE) ? TYPE_BIT(time_t) : MAX_BITS_IN_FILE)
672
673 static void
674 setboundaries P((void))
675 {
676         if (TYPE_SIGNED(time_t)) {
677                 min_time = ~ (time_t) 0;
678                 min_time <<= TIME_T_BITS_IN_FILE - 1;
679                 max_time = ~ (time_t) 0 - min_time;
680                 if (sflag)
681                         min_time = 0;
682         } else {
683                 min_time = 0;
684                 max_time = 2 - sflag;
685                 max_time <<= TIME_T_BITS_IN_FILE - 1;
686                 --max_time;
687         }
688         min_year = TM_YEAR_BASE + gmtime(&min_time)->tm_year;
689         max_year = TM_YEAR_BASE + gmtime(&max_time)->tm_year;
690         min_year_representable = min_year;
691         max_year_representable = max_year;
692 }
693
694 static int
695 itsdir(name)
696 const char * const      name;
697 {
698         register char * myname;
699         register int    accres;
700
701         myname = ecpyalloc(name);
702         myname = ecatalloc(myname, "/.");
703         accres = access(myname, F_OK);
704         ifree(myname);
705         return accres == 0;
706 }
707
708 /*
709 ** Associate sets of rules with zones.
710 */
711
712 /*
713 ** Sort by rule name.
714 */
715
716 static int
717 rcomp(cp1, cp2)
718 const void *    cp1;
719 const void *    cp2;
720 {
721         return strcmp(((const struct rule *) cp1)->r_name,
722                 ((const struct rule *) cp2)->r_name);
723 }
724
725 static void
726 associate P((void))
727 {
728         register struct zone *  zp;
729         register struct rule *  rp;
730         register int            base, out;
731         register int            i, j;
732
733         if (nrules != 0) {
734                 (void) qsort((void *) rules, (size_t) nrules,
735                         (size_t) sizeof *rules, rcomp);
736                 for (i = 0; i < nrules - 1; ++i) {
737                         if (strcmp(rules[i].r_name,
738                                 rules[i + 1].r_name) != 0)
739                                         continue;
740                         if (strcmp(rules[i].r_filename,
741                                 rules[i + 1].r_filename) == 0)
742                                         continue;
743                         eat(rules[i].r_filename, rules[i].r_linenum);
744                         warning(_("same rule name in multiple files"));
745                         eat(rules[i + 1].r_filename, rules[i + 1].r_linenum);
746                         warning(_("same rule name in multiple files"));
747                         for (j = i + 2; j < nrules; ++j) {
748                                 if (strcmp(rules[i].r_name,
749                                         rules[j].r_name) != 0)
750                                                 break;
751                                 if (strcmp(rules[i].r_filename,
752                                         rules[j].r_filename) == 0)
753                                                 continue;
754                                 if (strcmp(rules[i + 1].r_filename,
755                                         rules[j].r_filename) == 0)
756                                                 continue;
757                                 break;
758                         }
759                         i = j - 1;
760                 }
761         }
762         for (i = 0; i < nzones; ++i) {
763                 zp = &zones[i];
764                 zp->z_rules = NULL;
765                 zp->z_nrules = 0;
766         }
767         for (base = 0; base < nrules; base = out) {
768                 rp = &rules[base];
769                 for (out = base + 1; out < nrules; ++out)
770                         if (strcmp(rp->r_name, rules[out].r_name) != 0)
771                                 break;
772                 for (i = 0; i < nzones; ++i) {
773                         zp = &zones[i];
774                         if (strcmp(zp->z_rule, rp->r_name) != 0)
775                                 continue;
776                         zp->z_rules = rp;
777                         zp->z_nrules = out - base;
778                 }
779         }
780         for (i = 0; i < nzones; ++i) {
781                 zp = &zones[i];
782                 if (zp->z_nrules == 0) {
783                         /*
784                         ** Maybe we have a local standard time offset.
785                         */
786                         eat(zp->z_filename, zp->z_linenum);
787                         zp->z_stdoff = gethms(zp->z_rule, _("unruly zone"),
788                                               TRUE);
789                         /*
790                         ** Note, though, that if there's no rule,
791                         ** a '%s' in the format is a bad thing.
792                         */
793                         if (strchr(zp->z_format, '%') != 0)
794                                 error(_("%s in ruleless zone"));
795                 }
796         }
797         if (errors)
798                 (void) exit(EXIT_FAILURE);
799 }
800
801 static void
802 infile(name)
803 const char *    name;
804 {
805         register FILE *                 fp;
806         register char **                fields;
807         register char *                 cp;
808         register const struct lookup *  lp;
809         register int                    nfields;
810         register int                    wantcont;
811         register int                    num;
812         char                            buf[BUFSIZ];
813
814         if (strcmp(name, "-") == 0) {
815                 name = _("standard input");
816                 fp = stdin;
817         } else if ((fp = fopen(name, "r")) == NULL) {
818                 const char *e = strerror(errno);
819
820                 (void) fprintf(stderr, _("%s: Can't open %s: %s\n"),
821                         progname, name, e);
822                 (void) exit(EXIT_FAILURE);
823         }
824         wantcont = FALSE;
825         for (num = 1; ; ++num) {
826                 eat(name, num);
827                 if (fgets(buf, (int) sizeof buf, fp) != buf)
828                         break;
829                 cp = strchr(buf, '\n');
830                 if (cp == NULL) {
831                         error(_("line too long"));
832                         (void) exit(EXIT_FAILURE);
833                 }
834                 *cp = '\0';
835                 fields = getfields(buf);
836                 nfields = 0;
837                 while (fields[nfields] != NULL) {
838                         static char     nada;
839
840                         if (strcmp(fields[nfields], "-") == 0)
841                                 fields[nfields] = &nada;
842                         ++nfields;
843                 }
844                 if (nfields == 0) {
845                         /* nothing to do */
846                 } else if (wantcont) {
847                         wantcont = inzcont(fields, nfields);
848                 } else {
849                         lp = byword(fields[0], line_codes);
850                         if (lp == NULL)
851                                 error(_("input line of unknown type"));
852                         else switch ((int) (lp->l_value)) {
853                                 case LC_RULE:
854                                         inrule(fields, nfields);
855                                         wantcont = FALSE;
856                                         break;
857                                 case LC_ZONE:
858                                         wantcont = inzone(fields, nfields);
859                                         break;
860                                 case LC_LINK:
861                                         inlink(fields, nfields);
862                                         wantcont = FALSE;
863                                         break;
864                                 case LC_LEAP:
865                                         if (name != leapsec)
866                                                 (void) fprintf(stderr,
867 _("%s: Leap line in non leap seconds file %s\n"),
868                                                         progname, name);
869                                         else    inleap(fields, nfields);
870                                         wantcont = FALSE;
871                                         break;
872                                 default:        /* "cannot happen" */
873                                         (void) fprintf(stderr,
874 _("%s: panic: Invalid l_value %d\n"),
875                                                 progname, lp->l_value);
876                                         (void) exit(EXIT_FAILURE);
877                         }
878                 }
879                 ifree((char *) fields);
880         }
881         if (ferror(fp)) {
882                 (void) fprintf(stderr, _("%s: Error reading %s\n"),
883                         progname, filename);
884                 (void) exit(EXIT_FAILURE);
885         }
886         if (fp != stdin && fclose(fp)) {
887                 const char *e = strerror(errno);
888
889                 (void) fprintf(stderr, _("%s: Error closing %s: %s\n"),
890                         progname, filename, e);
891                 (void) exit(EXIT_FAILURE);
892         }
893         if (wantcont)
894                 error(_("expected continuation line not found"));
895 }
896
897 /*
898 ** Convert a string of one of the forms
899 **      h       -h      hh:mm   -hh:mm  hh:mm:ss        -hh:mm:ss
900 ** into a number of seconds.
901 ** A null string maps to zero.
902 ** Call error with errstring and return zero on errors.
903 */
904
905 static long
906 gethms(string, errstring, signable)
907 const char *            string;
908 const char * const      errstring;
909 const int               signable;
910 {
911         int     hh, mm, ss, sign;
912
913         if (string == NULL || *string == '\0')
914                 return 0;
915         if (!signable)
916                 sign = 1;
917         else if (*string == '-') {
918                 sign = -1;
919                 ++string;
920         } else  sign = 1;
921         if (sscanf(string, scheck(string, "%d"), &hh) == 1)
922                 mm = ss = 0;
923         else if (sscanf(string, scheck(string, "%d:%d"), &hh, &mm) == 2)
924                 ss = 0;
925         else if (sscanf(string, scheck(string, "%d:%d:%d"),
926                 &hh, &mm, &ss) != 3) {
927                         error(errstring);
928                         return 0;
929         }
930         if ((hh < 0 || hh >= HOURSPERDAY ||
931                 mm < 0 || mm >= MINSPERHOUR ||
932                 ss < 0 || ss > SECSPERMIN) &&
933                 !(hh == HOURSPERDAY && mm == 0 && ss == 0)) {
934                         error(errstring);
935                         return 0;
936         }
937         return eitol(sign) *
938                 (eitol(hh * MINSPERHOUR + mm) *
939                 eitol(SECSPERMIN) + eitol(ss));
940 }
941
942 static void
943 inrule(fields, nfields)
944 register char ** const  fields;
945 const int               nfields;
946 {
947         static struct rule      r;
948
949         if (nfields != RULE_FIELDS) {
950                 error(_("wrong number of fields on Rule line"));
951                 return;
952         }
953         if (*fields[RF_NAME] == '\0') {
954                 error(_("nameless rule"));
955                 return;
956         }
957         r.r_filename = filename;
958         r.r_linenum = linenum;
959         r.r_stdoff = gethms(fields[RF_STDOFF], _("invalid saved time"), TRUE);
960         rulesub(&r, fields[RF_LOYEAR], fields[RF_HIYEAR], fields[RF_COMMAND],
961                 fields[RF_MONTH], fields[RF_DAY], fields[RF_TOD]);
962         r.r_name = ecpyalloc(fields[RF_NAME]);
963         r.r_abbrvar = ecpyalloc(fields[RF_ABBRVAR]);
964         rules = (struct rule *) (void *) erealloc((char *) rules,
965                 (int) ((nrules + 1) * sizeof *rules));
966         rules[nrules++] = r;
967 }
968
969 static int
970 inzone(fields, nfields)
971 register char ** const  fields;
972 const int               nfields;
973 {
974         register int    i;
975         static char *   buf;
976
977         if (nfields < ZONE_MINFIELDS || nfields > ZONE_MAXFIELDS) {
978                 error(_("wrong number of fields on Zone line"));
979                 return FALSE;
980         }
981         if (strcmp(fields[ZF_NAME], TZDEFAULT) == 0 && lcltime != NULL) {
982                 buf = erealloc(buf, (int) (132 + strlen(TZDEFAULT)));
983                 (void) sprintf(buf,
984 _("\"Zone %s\" line and -l option are mutually exclusive"),
985                         TZDEFAULT);
986                 error(buf);
987                 return FALSE;
988         }
989         if (strcmp(fields[ZF_NAME], TZDEFRULES) == 0 && psxrules != NULL) {
990                 buf = erealloc(buf, (int) (132 + strlen(TZDEFRULES)));
991                 (void) sprintf(buf,
992 _("\"Zone %s\" line and -p option are mutually exclusive"),
993                         TZDEFRULES);
994                 error(buf);
995                 return FALSE;
996         }
997         for (i = 0; i < nzones; ++i)
998                 if (zones[i].z_name != NULL &&
999                         strcmp(zones[i].z_name, fields[ZF_NAME]) == 0) {
1000                                 buf = erealloc(buf, (int) (132 +
1001                                         strlen(fields[ZF_NAME]) +
1002                                         strlen(zones[i].z_filename)));
1003                                 (void) sprintf(buf,
1004 _("duplicate zone name %s (file \"%s\", line %d)"),
1005                                         fields[ZF_NAME],
1006                                         zones[i].z_filename,
1007                                         zones[i].z_linenum);
1008                                 error(buf);
1009                                 return FALSE;
1010                 }
1011         return inzsub(fields, nfields, FALSE);
1012 }
1013
1014 static int
1015 inzcont(fields, nfields)
1016 register char ** const  fields;
1017 const int               nfields;
1018 {
1019         if (nfields < ZONEC_MINFIELDS || nfields > ZONEC_MAXFIELDS) {
1020                 error(_("wrong number of fields on Zone continuation line"));
1021                 return FALSE;
1022         }
1023         return inzsub(fields, nfields, TRUE);
1024 }
1025
1026 static int
1027 inzsub(fields, nfields, iscont)
1028 register char ** const  fields;
1029 const int               nfields;
1030 const int               iscont;
1031 {
1032         register char *         cp;
1033         static struct zone      z;
1034         register int            i_gmtoff, i_rule, i_format;
1035         register int            i_untilyear, i_untilmonth;
1036         register int            i_untilday, i_untiltime;
1037         register int            hasuntil;
1038
1039         if (iscont) {
1040                 i_gmtoff = ZFC_GMTOFF;
1041                 i_rule = ZFC_RULE;
1042                 i_format = ZFC_FORMAT;
1043                 i_untilyear = ZFC_TILYEAR;
1044                 i_untilmonth = ZFC_TILMONTH;
1045                 i_untilday = ZFC_TILDAY;
1046                 i_untiltime = ZFC_TILTIME;
1047                 z.z_name = NULL;
1048         } else {
1049                 i_gmtoff = ZF_GMTOFF;
1050                 i_rule = ZF_RULE;
1051                 i_format = ZF_FORMAT;
1052                 i_untilyear = ZF_TILYEAR;
1053                 i_untilmonth = ZF_TILMONTH;
1054                 i_untilday = ZF_TILDAY;
1055                 i_untiltime = ZF_TILTIME;
1056                 z.z_name = ecpyalloc(fields[ZF_NAME]);
1057         }
1058         z.z_filename = filename;
1059         z.z_linenum = linenum;
1060         z.z_gmtoff = gethms(fields[i_gmtoff], _("invalid UTC offset"), TRUE);
1061         if ((cp = strchr(fields[i_format], '%')) != 0) {
1062                 if (*++cp != 's' || strchr(cp, '%') != 0) {
1063                         error(_("invalid abbreviation format"));
1064                         return FALSE;
1065                 }
1066         }
1067         z.z_rule = ecpyalloc(fields[i_rule]);
1068         z.z_format = ecpyalloc(fields[i_format]);
1069         hasuntil = nfields > i_untilyear;
1070         if (hasuntil) {
1071                 z.z_untilrule.r_filename = filename;
1072                 z.z_untilrule.r_linenum = linenum;
1073                 rulesub(&z.z_untilrule,
1074                         fields[i_untilyear],
1075                         "only",
1076                         "",
1077                         (nfields > i_untilmonth) ?
1078                         fields[i_untilmonth] : "Jan",
1079                         (nfields > i_untilday) ? fields[i_untilday] : "1",
1080                         (nfields > i_untiltime) ? fields[i_untiltime] : "0");
1081                 z.z_untiltime = rpytime(&z.z_untilrule,
1082                         z.z_untilrule.r_loyear);
1083                 if (iscont && nzones > 0 &&
1084                         z.z_untiltime > min_time &&
1085                         z.z_untiltime < max_time &&
1086                         zones[nzones - 1].z_untiltime > min_time &&
1087                         zones[nzones - 1].z_untiltime < max_time &&
1088                         zones[nzones - 1].z_untiltime >= z.z_untiltime) {
1089                                 error(_("Zone continuation line end time is not after end time of previous line"));
1090                                 return FALSE;
1091                 }
1092         }
1093         zones = (struct zone *) (void *) erealloc((char *) zones,
1094                 (int) ((nzones + 1) * sizeof *zones));
1095         zones[nzones++] = z;
1096         /*
1097         ** If there was an UNTIL field on this line,
1098         ** there's more information about the zone on the next line.
1099         */
1100         return hasuntil;
1101 }
1102
1103 static void
1104 inleap(fields, nfields)
1105 register char ** const  fields;
1106 const int               nfields;
1107 {
1108         register const char *           cp;
1109         register const struct lookup *  lp;
1110         register int                    i, j;
1111         int                             year, month, day;
1112         long                            dayoff, tod;
1113         time_t                          t;
1114
1115         if (nfields != LEAP_FIELDS) {
1116                 error(_("wrong number of fields on Leap line"));
1117                 return;
1118         }
1119         dayoff = 0;
1120         cp = fields[LP_YEAR];
1121         if (sscanf(cp, scheck(cp, "%d"), &year) != 1) {
1122                         /*
1123                          * Leapin' Lizards!
1124                          */
1125                         error(_("invalid leaping year"));
1126                         return;
1127         }
1128         j = EPOCH_YEAR;
1129         while (j != year) {
1130                 if (year > j) {
1131                         i = len_years[isleap(j)];
1132                         ++j;
1133                 } else {
1134                         --j;
1135                         i = -len_years[isleap(j)];
1136                 }
1137                 dayoff = oadd(dayoff, eitol(i));
1138         }
1139         if ((lp = byword(fields[LP_MONTH], mon_names)) == NULL) {
1140                 error(_("invalid month name"));
1141                 return;
1142         }
1143         month = lp->l_value;
1144         j = TM_JANUARY;
1145         while (j != month) {
1146                 i = len_months[isleap(year)][j];
1147                 dayoff = oadd(dayoff, eitol(i));
1148                 ++j;
1149         }
1150         cp = fields[LP_DAY];
1151         if (sscanf(cp, scheck(cp, "%d"), &day) != 1 ||
1152                 day <= 0 || day > len_months[isleap(year)][month]) {
1153                         error(_("invalid day of month"));
1154                         return;
1155         }
1156         dayoff = oadd(dayoff, eitol(day - 1));
1157         if (dayoff < 0 && !TYPE_SIGNED(time_t)) {
1158                 error(_("time before zero"));
1159                 return;
1160         }
1161         t = (time_t) dayoff * SECSPERDAY;
1162         /*
1163         ** Cheap overflow check.
1164         */
1165         if (t / SECSPERDAY != dayoff) {
1166                 error(_("time overflow"));
1167                 return;
1168         }
1169         tod = gethms(fields[LP_TIME], _("invalid time of day"), FALSE);
1170         cp = fields[LP_CORR];
1171         {
1172                 register int    positive;
1173                 int             count;
1174
1175                 if (strcmp(cp, "") == 0) { /* infile() turns "-" into "" */
1176                         positive = FALSE;
1177                         count = 1;
1178                 } else if (strcmp(cp, "--") == 0) {
1179                         positive = FALSE;
1180                         count = 2;
1181                 } else if (strcmp(cp, "+") == 0) {
1182                         positive = TRUE;
1183                         count = 1;
1184                 } else if (strcmp(cp, "++") == 0) {
1185                         positive = TRUE;
1186                         count = 2;
1187                 } else {
1188                         error(_("illegal CORRECTION field on Leap line"));
1189                         return;
1190                 }
1191                 if ((lp = byword(fields[LP_ROLL], leap_types)) == NULL) {
1192                         error(_("illegal Rolling/Stationary field on Leap line"));
1193                         return;
1194                 }
1195                 leapadd(tadd(t, tod), positive, lp->l_value, count);
1196         }
1197 }
1198
1199 static void
1200 inlink(fields, nfields)
1201 register char ** const  fields;
1202 const int               nfields;
1203 {
1204         struct link     l;
1205
1206         if (nfields != LINK_FIELDS) {
1207                 error(_("wrong number of fields on Link line"));
1208                 return;
1209         }
1210         if (*fields[LF_FROM] == '\0') {
1211                 error(_("blank FROM field on Link line"));
1212                 return;
1213         }
1214         if (*fields[LF_TO] == '\0') {
1215                 error(_("blank TO field on Link line"));
1216                 return;
1217         }
1218         l.l_filename = filename;
1219         l.l_linenum = linenum;
1220         l.l_from = ecpyalloc(fields[LF_FROM]);
1221         l.l_to = ecpyalloc(fields[LF_TO]);
1222         links = (struct link *) (void *) erealloc((char *) links,
1223                 (int) ((nlinks + 1) * sizeof *links));
1224         links[nlinks++] = l;
1225 }
1226
1227 static void
1228 rulesub(rp, loyearp, hiyearp, typep, monthp, dayp, timep)
1229 register struct rule * const    rp;
1230 const char * const              loyearp;
1231 const char * const              hiyearp;
1232 const char * const              typep;
1233 const char * const              monthp;
1234 const char * const              dayp;
1235 const char * const              timep;
1236 {
1237         register const struct lookup *  lp;
1238         register const char *           cp;
1239         register char *                 dp;
1240         register char *                 ep;
1241
1242         if ((lp = byword(monthp, mon_names)) == NULL) {
1243                 error(_("invalid month name"));
1244                 return;
1245         }
1246         rp->r_month = lp->l_value;
1247         rp->r_todisstd = FALSE;
1248         rp->r_todisgmt = FALSE;
1249         dp = ecpyalloc(timep);
1250         if (*dp != '\0') {
1251                 ep = dp + strlen(dp) - 1;
1252                 switch (lowerit(*ep)) {
1253                         case 's':       /* Standard */
1254                                 rp->r_todisstd = TRUE;
1255                                 rp->r_todisgmt = FALSE;
1256                                 *ep = '\0';
1257                                 break;
1258                         case 'w':       /* Wall */
1259                                 rp->r_todisstd = FALSE;
1260                                 rp->r_todisgmt = FALSE;
1261                                 *ep = '\0';
1262                                 break;
1263                         case 'g':       /* Greenwich */
1264                         case 'u':       /* Universal */
1265                         case 'z':       /* Zulu */
1266                                 rp->r_todisstd = TRUE;
1267                                 rp->r_todisgmt = TRUE;
1268                                 *ep = '\0';
1269                                 break;
1270                 }
1271         }
1272         rp->r_tod = gethms(dp, _("invalid time of day"), FALSE);
1273         ifree(dp);
1274         /*
1275         ** Year work.
1276         */
1277         cp = loyearp;
1278         lp = byword(cp, begin_years);
1279         if (lp != NULL) switch ((int) lp->l_value) {
1280                 case YR_MINIMUM:
1281                         rp->r_loyear = INT_MIN;
1282                         break;
1283                 case YR_MAXIMUM:
1284                         rp->r_loyear = INT_MAX;
1285                         break;
1286                 default:        /* "cannot happen" */
1287                         (void) fprintf(stderr,
1288                                 _("%s: panic: Invalid l_value %d\n"),
1289                                 progname, lp->l_value);
1290                         (void) exit(EXIT_FAILURE);
1291         } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_loyear) != 1) {
1292                 error(_("invalid starting year"));
1293                 return;
1294         } else if (noise) {
1295                 if (rp->r_loyear < min_year_representable)
1296                         warning(_("starting year too low to be represented"));
1297                 else if (rp->r_loyear > max_year_representable)
1298                         warning(_("starting year too high to be represented"));
1299         }
1300         cp = hiyearp;
1301         if ((lp = byword(cp, end_years)) != NULL) switch ((int) lp->l_value) {
1302                 case YR_MINIMUM:
1303                         rp->r_hiyear = INT_MIN;
1304                         break;
1305                 case YR_MAXIMUM:
1306                         rp->r_hiyear = INT_MAX;
1307                         break;
1308                 case YR_ONLY:
1309                         rp->r_hiyear = rp->r_loyear;
1310                         break;
1311                 default:        /* "cannot happen" */
1312                         (void) fprintf(stderr,
1313                                 _("%s: panic: Invalid l_value %d\n"),
1314                                 progname, lp->l_value);
1315                         (void) exit(EXIT_FAILURE);
1316         } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_hiyear) != 1) {
1317                 error(_("invalid ending year"));
1318                 return;
1319         } else if (noise) {
1320                 if (rp->r_loyear < min_year_representable)
1321                         warning(_("starting year too low to be represented"));
1322                 else if (rp->r_loyear > max_year_representable)
1323                         warning(_("starting year too high to be represented"));
1324         }
1325         if (rp->r_loyear > rp->r_hiyear) {
1326                 error(_("starting year greater than ending year"));
1327                 return;
1328         }
1329         if (*typep == '\0')
1330                 rp->r_yrtype = NULL;
1331         else {
1332                 if (rp->r_loyear == rp->r_hiyear) {
1333                         error(_("typed single year"));
1334                         return;
1335                 }
1336                 rp->r_yrtype = ecpyalloc(typep);
1337         }
1338         if (rp->r_loyear < min_year && rp->r_loyear > 0)
1339                 min_year = rp->r_loyear;
1340         /*
1341         ** Day work.
1342         ** Accept things such as:
1343         **      1
1344         **      last-Sunday
1345         **      Sun<=20
1346         **      Sun>=7
1347         */
1348         dp = ecpyalloc(dayp);
1349         if ((lp = byword(dp, lasts)) != NULL) {
1350                 rp->r_dycode = DC_DOWLEQ;
1351                 rp->r_wday = lp->l_value;
1352                 rp->r_dayofmonth = len_months[1][rp->r_month];
1353         } else {
1354                 if ((ep = strchr(dp, '<')) != 0)
1355                         rp->r_dycode = DC_DOWLEQ;
1356                 else if ((ep = strchr(dp, '>')) != 0)
1357                         rp->r_dycode = DC_DOWGEQ;
1358                 else {
1359                         ep = dp;
1360                         rp->r_dycode = DC_DOM;
1361                 }
1362                 if (rp->r_dycode != DC_DOM) {
1363                         *ep++ = 0;
1364                         if (*ep++ != '=') {
1365                                 error(_("invalid day of month"));
1366                                 ifree(dp);
1367                                 return;
1368                         }
1369                         if ((lp = byword(dp, wday_names)) == NULL) {
1370                                 error(_("invalid weekday name"));
1371                                 ifree(dp);
1372                                 return;
1373                         }
1374                         rp->r_wday = lp->l_value;
1375                 }
1376                 if (sscanf(ep, scheck(ep, "%d"), &rp->r_dayofmonth) != 1 ||
1377                         rp->r_dayofmonth <= 0 ||
1378                         (rp->r_dayofmonth > len_months[1][rp->r_month])) {
1379                                 error(_("invalid day of month"));
1380                                 ifree(dp);
1381                                 return;
1382                 }
1383         }
1384         ifree(dp);
1385 }
1386
1387 static void
1388 convert(val, buf)
1389 const long      val;
1390 char * const    buf;
1391 {
1392         register int    i;
1393         register long   shift;
1394
1395         for (i = 0, shift = 24; i < 4; ++i, shift -= 8)
1396                 buf[i] = val >> shift;
1397 }
1398
1399 static void
1400 puttzcode(val, fp)
1401 const long      val;
1402 FILE * const    fp;
1403 {
1404         char    buf[4];
1405
1406         convert(val, buf);
1407         (void) fwrite((void *) buf, (size_t) sizeof buf, (size_t) 1, fp);
1408 }
1409
1410 static int
1411 atcomp(avp, bvp)
1412 void *  avp;
1413 void *  bvp;
1414 {
1415         if (((struct attype *) avp)->at < ((struct attype *) bvp)->at)
1416                 return -1;
1417         else if (((struct attype *) avp)->at > ((struct attype *) bvp)->at)
1418                 return 1;
1419         else    return 0;
1420 }
1421
1422 static void
1423 writezone(name)
1424 const char * const      name;
1425 {
1426         register FILE *         fp;
1427         register int            i, j;
1428         static char *           fullname;
1429         static struct tzhead    tzh;
1430         time_t                  ats[TZ_MAX_TIMES];
1431         unsigned char           types[TZ_MAX_TIMES];
1432
1433         /*
1434         ** Sort.
1435         */
1436         if (timecnt > 1)
1437                 (void) qsort((void *) attypes, (size_t) timecnt,
1438                         (size_t) sizeof *attypes, atcomp);
1439         /*
1440         ** Optimize.
1441         */
1442         {
1443                 int     fromi;
1444                 int     toi;
1445
1446                 toi = 0;
1447                 fromi = 0;
1448                 while (fromi < timecnt && attypes[fromi].at < min_time)
1449                         ++fromi;
1450                 if (isdsts[0] == 0)
1451                         while (fromi < timecnt && attypes[fromi].type == 0)
1452                                 ++fromi;        /* handled by default rule */
1453                 for ( ; fromi < timecnt; ++fromi) {
1454                         if (toi != 0
1455                             && ((attypes[fromi].at
1456                                  + gmtoffs[attypes[toi - 1].type])
1457                                 <= (attypes[toi - 1].at
1458                                     + gmtoffs[toi == 1 ? 0
1459                                               : attypes[toi - 2].type]))) {
1460                                 attypes[toi - 1].type = attypes[fromi].type;
1461                                 continue;
1462                         }
1463                         if (toi == 0 ||
1464                                 attypes[toi - 1].type != attypes[fromi].type)
1465                                         attypes[toi++] = attypes[fromi];
1466                 }
1467                 timecnt = toi;
1468         }
1469         /*
1470         ** Transfer.
1471         */
1472         for (i = 0; i < timecnt; ++i) {
1473                 ats[i] = attypes[i].at;
1474                 types[i] = attypes[i].type;
1475         }
1476         fullname = erealloc(fullname,
1477                 (int) (strlen(directory) + 1 + strlen(name) + 1));
1478         (void) sprintf(fullname, "%s/%s", directory, name);
1479         /*
1480         ** Remove old file, if any, to snap links.
1481         */
1482         if (!itsdir(fullname) && remove(fullname) != 0 && errno != ENOENT) {
1483                 const char *e = strerror(errno);
1484
1485                 (void) fprintf(stderr, _("%s: Can't remove %s: %s\n"),
1486                         progname, fullname, e);
1487                 (void) exit(EXIT_FAILURE);
1488         }
1489         if ((fp = fopen(fullname, "wb")) == NULL) {
1490                 if (mkdirs(fullname) != 0)
1491                         (void) exit(EXIT_FAILURE);
1492                 if ((fp = fopen(fullname, "wb")) == NULL) {
1493                         const char *e = strerror(errno);
1494
1495                         (void) fprintf(stderr, _("%s: Can't create %s: %s\n"),
1496                                 progname, fullname, e);
1497                         (void) exit(EXIT_FAILURE);
1498                 }
1499         }
1500         convert(eitol(typecnt), tzh.tzh_ttisgmtcnt);
1501         convert(eitol(typecnt), tzh.tzh_ttisstdcnt);
1502         convert(eitol(leapcnt), tzh.tzh_leapcnt);
1503         convert(eitol(timecnt), tzh.tzh_timecnt);
1504         convert(eitol(typecnt), tzh.tzh_typecnt);
1505         convert(eitol(charcnt), tzh.tzh_charcnt);
1506         (void) strncpy(tzh.tzh_magic, TZ_MAGIC, sizeof tzh.tzh_magic);
1507 #define DO(field)       (void) fwrite((void *) tzh.field, (size_t) sizeof tzh.field, (size_t) 1, fp)
1508         DO(tzh_magic);
1509         DO(tzh_reserved);
1510         DO(tzh_ttisgmtcnt);
1511         DO(tzh_ttisstdcnt);
1512         DO(tzh_leapcnt);
1513         DO(tzh_timecnt);
1514         DO(tzh_typecnt);
1515         DO(tzh_charcnt);
1516 #undef DO
1517         for (i = 0; i < timecnt; ++i) {
1518                 j = leapcnt;
1519                 while (--j >= 0)
1520                         if (ats[i] >= trans[j]) {
1521                                 ats[i] = tadd(ats[i], corr[j]);
1522                                 break;
1523                         }
1524                 puttzcode((long) ats[i], fp);
1525         }
1526         if (timecnt > 0)
1527                 (void) fwrite((void *) types, (size_t) sizeof types[0],
1528                         (size_t) timecnt, fp);
1529         for (i = 0; i < typecnt; ++i) {
1530                 puttzcode((long) gmtoffs[i], fp);
1531                 (void) putc(isdsts[i], fp);
1532                 (void) putc(abbrinds[i], fp);
1533         }
1534         if (charcnt != 0)
1535                 (void) fwrite((void *) chars, (size_t) sizeof chars[0],
1536                         (size_t) charcnt, fp);
1537         for (i = 0; i < leapcnt; ++i) {
1538                 if (roll[i]) {
1539                         if (timecnt == 0 || trans[i] < ats[0]) {
1540                                 j = 0;
1541                                 while (isdsts[j])
1542                                         if (++j >= typecnt) {
1543                                                 j = 0;
1544                                                 break;
1545                                         }
1546                         } else {
1547                                 j = 1;
1548                                 while (j < timecnt && trans[i] >= ats[j])
1549                                         ++j;
1550                                 j = types[j - 1];
1551                         }
1552                         puttzcode((long) tadd(trans[i], -gmtoffs[j]), fp);
1553                 } else  puttzcode((long) trans[i], fp);
1554                 puttzcode((long) corr[i], fp);
1555         }
1556         for (i = 0; i < typecnt; ++i)
1557                 (void) putc(ttisstds[i], fp);
1558         for (i = 0; i < typecnt; ++i)
1559                 (void) putc(ttisgmts[i], fp);
1560         if (ferror(fp) || fclose(fp)) {
1561                 (void) fprintf(stderr, _("%s: Error writing %s\n"),
1562                         progname, fullname);
1563                 (void) exit(EXIT_FAILURE);
1564         }
1565 }
1566
1567 static void
1568 doabbr(abbr, format, letters, isdst)
1569 char * const            abbr;
1570 const char * const      format;
1571 const char * const      letters;
1572 const int               isdst;
1573 {
1574         if (strchr(format, '/') == NULL) {
1575                 if (letters == NULL)
1576                         (void) strcpy(abbr, format);
1577                 else    (void) sprintf(abbr, format, letters);
1578         } else if (isdst)
1579                 (void) strcpy(abbr, strchr(format, '/') + 1);
1580         else {
1581                 (void) strcpy(abbr, format);
1582                 *strchr(abbr, '/') = '\0';
1583         }
1584 }
1585
1586 static void
1587 outzone(zpfirst, zonecount)
1588 const struct zone * const       zpfirst;
1589 const int                       zonecount;
1590 {
1591         register const struct zone *    zp;
1592         register struct rule *          rp;
1593         register int                    i, j;
1594         register int                    usestart, useuntil;
1595         register time_t                 starttime, untiltime;
1596         register long                   gmtoff;
1597         register long                   stdoff;
1598         register int                    year;
1599         register long                   startoff;
1600         register int                    startttisstd;
1601         register int                    startttisgmt;
1602         register int                    type;
1603         char                            startbuf[BUFSIZ];
1604
1605         INITIALIZE(untiltime);
1606         INITIALIZE(starttime);
1607         /*
1608         ** Now. . .finally. . .generate some useful data!
1609         */
1610         timecnt = 0;
1611         typecnt = 0;
1612         charcnt = 0;
1613         /*
1614         ** A guess that may well be corrected later.
1615         */
1616         stdoff = 0;
1617         /*
1618         ** Thanks to Earl Chew (earl@dnd.icp.nec.com.au)
1619         ** for noting the need to unconditionally initialize startttisstd.
1620         */
1621         startttisstd = FALSE;
1622         startttisgmt = FALSE;
1623         for (i = 0; i < zonecount; ++i) {
1624                 zp = &zpfirst[i];
1625                 usestart = i > 0 && (zp - 1)->z_untiltime > min_time;
1626                 useuntil = i < (zonecount - 1);
1627                 if (useuntil && zp->z_untiltime <= min_time)
1628                         continue;
1629                 gmtoff = zp->z_gmtoff;
1630                 eat(zp->z_filename, zp->z_linenum);
1631                 *startbuf = '\0';
1632                 startoff = zp->z_gmtoff;
1633                 if (zp->z_nrules == 0) {
1634                         stdoff = zp->z_stdoff;
1635                         doabbr(startbuf, zp->z_format,
1636                                 (char *) NULL, stdoff != 0);
1637                         type = addtype(oadd(zp->z_gmtoff, stdoff),
1638                                 startbuf, stdoff != 0, startttisstd,
1639                                 startttisgmt);
1640                         if (usestart) {
1641                                 addtt(starttime, type);
1642                                 usestart = FALSE;
1643                         }
1644                         else if (stdoff != 0)
1645                                 addtt(min_time, type);
1646                 } else for (year = min_year; year <= max_year; ++year) {
1647                         if (useuntil && year > zp->z_untilrule.r_hiyear)
1648                                 break;
1649                         /*
1650                         ** Mark which rules to do in the current year.
1651                         ** For those to do, calculate rpytime(rp, year);
1652                         */
1653                         for (j = 0; j < zp->z_nrules; ++j) {
1654                                 rp = &zp->z_rules[j];
1655                                 eats(zp->z_filename, zp->z_linenum,
1656                                         rp->r_filename, rp->r_linenum);
1657                                 rp->r_todo = year >= rp->r_loyear &&
1658                                                 year <= rp->r_hiyear &&
1659                                                 yearistype(year, rp->r_yrtype);
1660                                 if (rp->r_todo)
1661                                         rp->r_temp = rpytime(rp, year);
1662                         }
1663                         for ( ; ; ) {
1664                                 register int    k;
1665                                 register time_t jtime, ktime;
1666                                 register long   offset;
1667                                 char            buf[BUFSIZ];
1668
1669                                 INITIALIZE(ktime);
1670                                 if (useuntil) {
1671                                         /*
1672                                         ** Turn untiltime into UTC
1673                                         ** assuming the current gmtoff and
1674                                         ** stdoff values.
1675                                         */
1676                                         untiltime = zp->z_untiltime;
1677                                         if (!zp->z_untilrule.r_todisgmt)
1678                                                 untiltime = tadd(untiltime,
1679                                                         -gmtoff);
1680                                         if (!zp->z_untilrule.r_todisstd)
1681                                                 untiltime = tadd(untiltime,
1682                                                         -stdoff);
1683                                 }
1684                                 /*
1685                                 ** Find the rule (of those to do, if any)
1686                                 ** that takes effect earliest in the year.
1687                                 */
1688                                 k = -1;
1689                                 for (j = 0; j < zp->z_nrules; ++j) {
1690                                         rp = &zp->z_rules[j];
1691                                         if (!rp->r_todo)
1692                                                 continue;
1693                                         eats(zp->z_filename, zp->z_linenum,
1694                                                 rp->r_filename, rp->r_linenum);
1695                                         offset = rp->r_todisgmt ? 0 : gmtoff;
1696                                         if (!rp->r_todisstd)
1697                                                 offset = oadd(offset, stdoff);
1698                                         jtime = rp->r_temp;
1699                                         if (jtime == min_time ||
1700                                                 jtime == max_time)
1701                                                         continue;
1702                                         jtime = tadd(jtime, -offset);
1703                                         if (k < 0 || jtime < ktime) {
1704                                                 k = j;
1705                                                 ktime = jtime;
1706                                         }
1707                                 }
1708                                 if (k < 0)
1709                                         break;  /* go on to next year */
1710                                 rp = &zp->z_rules[k];
1711                                 rp->r_todo = FALSE;
1712                                 if (useuntil && ktime >= untiltime)
1713                                         break;
1714                                 stdoff = rp->r_stdoff;
1715                                 if (usestart && ktime == starttime)
1716                                         usestart = FALSE;
1717                                 if (usestart) {
1718                                         if (ktime < starttime) {
1719                                                 startoff = oadd(zp->z_gmtoff,
1720                                                         stdoff);
1721                                                 doabbr(startbuf, zp->z_format,
1722                                                         rp->r_abbrvar,
1723                                                         rp->r_stdoff != 0);
1724                                                 continue;
1725                                         }
1726                                         if (*startbuf == '\0' &&
1727                                             startoff == oadd(zp->z_gmtoff,
1728                                             stdoff)) {
1729                                                 doabbr(startbuf, zp->z_format,
1730                                                         rp->r_abbrvar,
1731                                                         rp->r_stdoff != 0);
1732                                         }
1733                                 }
1734                                 eats(zp->z_filename, zp->z_linenum,
1735                                         rp->r_filename, rp->r_linenum);
1736                                 doabbr(buf, zp->z_format, rp->r_abbrvar,
1737                                         rp->r_stdoff != 0);
1738                                 offset = oadd(zp->z_gmtoff, rp->r_stdoff);
1739                                 type = addtype(offset, buf, rp->r_stdoff != 0,
1740                                         rp->r_todisstd, rp->r_todisgmt);
1741                                 addtt(ktime, type);
1742                         }
1743                 }
1744                 if (usestart) {
1745                         if (*startbuf == '\0' &&
1746                                 zp->z_format != NULL &&
1747                                 strchr(zp->z_format, '%') == NULL &&
1748                                 strchr(zp->z_format, '/') == NULL)
1749                                         (void) strcpy(startbuf, zp->z_format);
1750                         eat(zp->z_filename, zp->z_linenum);
1751                         if (*startbuf == '\0')
1752 error(_("can't determine time zone abbreviation to use just after until time"));
1753                         else    addtt(starttime,
1754                                         addtype(startoff, startbuf,
1755                                                 startoff != zp->z_gmtoff,
1756                                                 startttisstd,
1757                                                 startttisgmt));
1758                 }
1759                 /*
1760                 ** Now we may get to set starttime for the next zone line.
1761                 */
1762                 if (useuntil) {
1763                         startttisstd = zp->z_untilrule.r_todisstd;
1764                         startttisgmt = zp->z_untilrule.r_todisgmt;
1765                         starttime = zp->z_untiltime;
1766                         if (!startttisstd)
1767                                 starttime = tadd(starttime, -stdoff);
1768                         if (!startttisgmt)
1769                                 starttime = tadd(starttime, -gmtoff);
1770                 }
1771         }
1772         writezone(zpfirst->z_name);
1773 }
1774
1775 static void
1776 addtt(starttime, type)
1777 const time_t    starttime;
1778 int             type;
1779 {
1780         if (starttime <= min_time ||
1781                 (timecnt == 1 && attypes[0].at < min_time)) {
1782                 gmtoffs[0] = gmtoffs[type];
1783                 isdsts[0] = isdsts[type];
1784                 ttisstds[0] = ttisstds[type];
1785                 ttisgmts[0] = ttisgmts[type];
1786                 if (abbrinds[type] != 0)
1787                         (void) strcpy(chars, &chars[abbrinds[type]]);
1788                 abbrinds[0] = 0;
1789                 charcnt = strlen(chars) + 1;
1790                 typecnt = 1;
1791                 timecnt = 0;
1792                 type = 0;
1793         }
1794         if (timecnt >= TZ_MAX_TIMES) {
1795                 error(_("too many transitions?!"));
1796                 (void) exit(EXIT_FAILURE);
1797         }
1798         attypes[timecnt].at = starttime;
1799         attypes[timecnt].type = type;
1800         ++timecnt;
1801 }
1802
1803 static int
1804 addtype(gmtoff, abbr, isdst, ttisstd, ttisgmt)
1805 const long              gmtoff;
1806 const char * const      abbr;
1807 const int               isdst;
1808 const int               ttisstd;
1809 const int               ttisgmt;
1810 {
1811         register int    i, j;
1812
1813         if (isdst != TRUE && isdst != FALSE) {
1814                 error(_("internal error - addtype called with bad isdst"));
1815                 (void) exit(EXIT_FAILURE);
1816         }
1817         if (ttisstd != TRUE && ttisstd != FALSE) {
1818                 error(_("internal error - addtype called with bad ttisstd"));
1819                 (void) exit(EXIT_FAILURE);
1820         }
1821         if (ttisgmt != TRUE && ttisgmt != FALSE) {
1822                 error(_("internal error - addtype called with bad ttisgmt"));
1823                 (void) exit(EXIT_FAILURE);
1824         }
1825         /*
1826         ** See if there's already an entry for this zone type.
1827         ** If so, just return its index.
1828         */
1829         for (i = 0; i < typecnt; ++i) {
1830                 if (gmtoff == gmtoffs[i] && isdst == isdsts[i] &&
1831                         strcmp(abbr, &chars[abbrinds[i]]) == 0 &&
1832                         ttisstd == ttisstds[i] &&
1833                         ttisgmt == ttisgmts[i])
1834                                 return i;
1835         }
1836         /*
1837         ** There isn't one; add a new one, unless there are already too
1838         ** many.
1839         */
1840         if (typecnt >= TZ_MAX_TYPES) {
1841                 error(_("too many local time types"));
1842                 (void) exit(EXIT_FAILURE);
1843         }
1844         gmtoffs[i] = gmtoff;
1845         isdsts[i] = isdst;
1846         ttisstds[i] = ttisstd;
1847         ttisgmts[i] = ttisgmt;
1848
1849         for (j = 0; j < charcnt; ++j)
1850                 if (strcmp(&chars[j], abbr) == 0)
1851                         break;
1852         if (j == charcnt)
1853                 newabbr(abbr);
1854         abbrinds[i] = j;
1855         ++typecnt;
1856         return i;
1857 }
1858
1859 static void
1860 leapadd(t, positive, rolling, count)
1861 const time_t    t;
1862 const int       positive;
1863 const int       rolling;
1864 int             count;
1865 {
1866         register int    i, j;
1867
1868         if (leapcnt + (positive ? count : 1) > TZ_MAX_LEAPS) {
1869                 error(_("too many leap seconds"));
1870                 (void) exit(EXIT_FAILURE);
1871         }
1872         for (i = 0; i < leapcnt; ++i)
1873                 if (t <= trans[i]) {
1874                         if (t == trans[i]) {
1875                                 error(_("repeated leap second moment"));
1876                                 (void) exit(EXIT_FAILURE);
1877                         }
1878                         break;
1879                 }
1880         do {
1881                 for (j = leapcnt; j > i; --j) {
1882                         trans[j] = trans[j - 1];
1883                         corr[j] = corr[j - 1];
1884                         roll[j] = roll[j - 1];
1885                 }
1886                 trans[i] = t;
1887                 corr[i] = positive ? 1L : eitol(-count);
1888                 roll[i] = rolling;
1889                 ++leapcnt;
1890         } while (positive && --count != 0);
1891 }
1892
1893 static void
1894 adjleap P((void))
1895 {
1896         register int    i;
1897         register long   last = 0;
1898
1899         /*
1900         ** propagate leap seconds forward
1901         */
1902         for (i = 0; i < leapcnt; ++i) {
1903                 trans[i] = tadd(trans[i], last);
1904                 last = corr[i] += last;
1905         }
1906 }
1907
1908 static int
1909 yearistype(year, type)
1910 const int               year;
1911 const char * const      type;
1912 {
1913         static char *   buf;
1914         int             result;
1915
1916         if (type == NULL || *type == '\0')
1917                 return TRUE;
1918         buf = erealloc(buf, (int) (132 + strlen(yitcommand) + strlen(type)));
1919         (void) sprintf(buf, "%s %d %s", yitcommand, year, type);
1920         result = system(buf);
1921         if (WIFEXITED(result)) switch (WEXITSTATUS(result)) {
1922                 case 0:
1923                         return TRUE;
1924                 case 1:
1925                         return FALSE;
1926         }
1927         error(_("Wild result from command execution"));
1928         (void) fprintf(stderr, _("%s: command was '%s', result was %d\n"),
1929                 progname, buf, result);
1930         for ( ; ; )
1931                 (void) exit(EXIT_FAILURE);
1932 }
1933
1934 static int
1935 lowerit(a)
1936 int     a;
1937 {
1938         a = (unsigned char) a;
1939         return (isascii(a) && isupper(a)) ? tolower(a) : a;
1940 }
1941
1942 static int
1943 ciequal(ap, bp)         /* case-insensitive equality */
1944 register const char *   ap;
1945 register const char *   bp;
1946 {
1947         while (lowerit(*ap) == lowerit(*bp++))
1948                 if (*ap++ == '\0')
1949                         return TRUE;
1950         return FALSE;
1951 }
1952
1953 static int
1954 itsabbr(abbr, word)
1955 register const char *   abbr;
1956 register const char *   word;
1957 {
1958         if (lowerit(*abbr) != lowerit(*word))
1959                 return FALSE;
1960         ++word;
1961         while (*++abbr != '\0')
1962                 do {
1963                         if (*word == '\0')
1964                                 return FALSE;
1965                 } while (lowerit(*word++) != lowerit(*abbr));
1966         return TRUE;
1967 }
1968
1969 static const struct lookup *
1970 byword(word, table)
1971 register const char * const             word;
1972 register const struct lookup * const    table;
1973 {
1974         register const struct lookup *  foundlp;
1975         register const struct lookup *  lp;
1976
1977         if (word == NULL || table == NULL)
1978                 return NULL;
1979         /*
1980         ** Look for exact match.
1981         */
1982         for (lp = table; lp->l_word != NULL; ++lp)
1983                 if (ciequal(word, lp->l_word))
1984                         return lp;
1985         /*
1986         ** Look for inexact match.
1987         */
1988         foundlp = NULL;
1989         for (lp = table; lp->l_word != NULL; ++lp)
1990                 if (itsabbr(word, lp->l_word)) {
1991                         if (foundlp == NULL)
1992                                 foundlp = lp;
1993                         else    return NULL;    /* multiple inexact matches */
1994                 }
1995         return foundlp;
1996 }
1997
1998 static char **
1999 getfields(cp)
2000 register char * cp;
2001 {
2002         register char *         dp;
2003         register char **        array;
2004         register int            nsubs;
2005
2006         if (cp == NULL)
2007                 return NULL;
2008         array = (char **) (void *)
2009                 emalloc((int) ((strlen(cp) + 1) * sizeof *array));
2010         nsubs = 0;
2011         for ( ; ; ) {
2012                 while (isascii(*cp) && isspace((unsigned char) *cp))
2013                         ++cp;
2014                 if (*cp == '\0' || *cp == '#')
2015                         break;
2016                 array[nsubs++] = dp = cp;
2017                 do {
2018                         if ((*dp = *cp++) != '"')
2019                                 ++dp;
2020                         else while ((*dp = *cp++) != '"')
2021                                 if (*dp != '\0')
2022                                         ++dp;
2023                                 else    error(_("Odd number of quotation marks"));
2024                 } while (*cp != '\0' && *cp != '#' &&
2025                         (!isascii(*cp) || !isspace((unsigned char) *cp)));
2026                 if (isascii(*cp) && isspace((unsigned char) *cp))
2027                         ++cp;
2028                 *dp = '\0';
2029         }
2030         array[nsubs] = NULL;
2031         return array;
2032 }
2033
2034 static long
2035 oadd(t1, t2)
2036 const long      t1;
2037 const long      t2;
2038 {
2039         register long   t;
2040
2041         t = t1 + t2;
2042         if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {
2043                 error(_("time overflow"));
2044                 (void) exit(EXIT_FAILURE);
2045         }
2046         return t;
2047 }
2048
2049 static time_t
2050 tadd(t1, t2)
2051 const time_t    t1;
2052 const long      t2;
2053 {
2054         register time_t t;
2055
2056         if (t1 == max_time && t2 > 0)
2057                 return max_time;
2058         if (t1 == min_time && t2 < 0)
2059                 return min_time;
2060         t = t1 + t2;
2061         if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {
2062                 error(_("time overflow"));
2063                 (void) exit(EXIT_FAILURE);
2064         }
2065         return t;
2066 }
2067
2068 /*
2069 ** Given a rule, and a year, compute the date - in seconds since January 1,
2070 ** 1970, 00:00 LOCAL time - in that year that the rule refers to.
2071 */
2072
2073 static time_t
2074 rpytime(rp, wantedy)
2075 register const struct rule * const      rp;
2076 register const int                      wantedy;
2077 {
2078         register int    y, m, i;
2079         register long   dayoff;                 /* with a nod to Margaret O. */
2080         register time_t t;
2081
2082         if (wantedy == INT_MIN)
2083                 return min_time;
2084         if (wantedy == INT_MAX)
2085                 return max_time;
2086         dayoff = 0;
2087         m = TM_JANUARY;
2088         y = EPOCH_YEAR;
2089         while (wantedy != y) {
2090                 if (wantedy > y) {
2091                         i = len_years[isleap(y)];
2092                         ++y;
2093                 } else {
2094                         --y;
2095                         i = -len_years[isleap(y)];
2096                 }
2097                 dayoff = oadd(dayoff, eitol(i));
2098         }
2099         while (m != rp->r_month) {
2100                 i = len_months[isleap(y)][m];
2101                 dayoff = oadd(dayoff, eitol(i));
2102                 ++m;
2103         }
2104         i = rp->r_dayofmonth;
2105         if (m == TM_FEBRUARY && i == 29 && !isleap(y)) {
2106                 if (rp->r_dycode == DC_DOWLEQ)
2107                         --i;
2108                 else {
2109                         error(_("use of 2/29 in non leap-year"));
2110                         (void) exit(EXIT_FAILURE);
2111                 }
2112         }
2113         --i;
2114         dayoff = oadd(dayoff, eitol(i));
2115         if (rp->r_dycode == DC_DOWGEQ || rp->r_dycode == DC_DOWLEQ) {
2116                 register long   wday;
2117
2118 #define LDAYSPERWEEK    ((long) DAYSPERWEEK)
2119                 wday = eitol(EPOCH_WDAY);
2120                 /*
2121                 ** Don't trust mod of negative numbers.
2122                 */
2123                 if (dayoff >= 0)
2124                         wday = (wday + dayoff) % LDAYSPERWEEK;
2125                 else {
2126                         wday -= ((-dayoff) % LDAYSPERWEEK);
2127                         if (wday < 0)
2128                                 wday += LDAYSPERWEEK;
2129                 }
2130                 while (wday != eitol(rp->r_wday))
2131                         if (rp->r_dycode == DC_DOWGEQ) {
2132                                 dayoff = oadd(dayoff, (long) 1);
2133                                 if (++wday >= LDAYSPERWEEK)
2134                                         wday = 0;
2135                                 ++i;
2136                         } else {
2137                                 dayoff = oadd(dayoff, (long) -1);
2138                                 if (--wday < 0)
2139                                         wday = LDAYSPERWEEK - 1;
2140                                 --i;
2141                         }
2142                 if (i < 0 || i >= len_months[isleap(y)][m]) {
2143                         error(_("no day in month matches rule"));
2144                         (void) exit(EXIT_FAILURE);
2145                 }
2146         }
2147         if (dayoff < 0 && !TYPE_SIGNED(time_t))
2148                 return min_time;
2149         t = (time_t) dayoff * SECSPERDAY;
2150         /*
2151         ** Cheap overflow check.
2152         */
2153         if (t / SECSPERDAY != dayoff)
2154                 return (dayoff > 0) ? max_time : min_time;
2155         return tadd(t, rp->r_tod);
2156 }
2157
2158 static void
2159 newabbr(string)
2160 const char * const      string;
2161 {
2162         register int    i;
2163
2164         i = strlen(string) + 1;
2165         if (charcnt + i > TZ_MAX_CHARS) {
2166                 error(_("too many, or too long, time zone abbreviations"));
2167                 (void) exit(EXIT_FAILURE);
2168         }
2169         (void) strcpy(&chars[charcnt], string);
2170         charcnt += eitol(i);
2171 }
2172
2173 static int
2174 mkdirs(argname)
2175 char * const    argname;
2176 {
2177         register char * name;
2178         register char * cp;
2179
2180         if (argname == NULL || *argname == '\0')
2181                 return 0;
2182         cp = name = ecpyalloc(argname);
2183         while ((cp = strchr(cp + 1, '/')) != 0) {
2184                 *cp = '\0';
2185 #ifndef unix
2186                 /*
2187                 ** DOS drive specifier?
2188                 */
2189                 if (isalpha((unsigned char) name[0]) &&
2190                         name[1] == ':' && name[2] == '\0') {
2191                                 *cp = '/';
2192                                 continue;
2193                 }
2194 #endif /* !defined unix */
2195                 if (!itsdir(name)) {
2196                         /*
2197                         ** It doesn't seem to exist, so we try to create it.
2198                         ** Creation may fail because of the directory being
2199                         ** created by some other multiprocessor, so we get
2200                         ** to do extra checking.
2201                         */
2202                         if (mkdir(name, S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH) != 0) {
2203                                 const char *e = strerror(errno);
2204
2205                                 if (errno != EEXIST || !itsdir(name)) {
2206                                         (void) fprintf(stderr,
2207 _("%s: Can't create directory %s: %s\n"),
2208                                                 progname, name, e);
2209                                         ifree(name);
2210                                         return -1;
2211                                 }
2212                         }
2213                 }
2214                 *cp = '/';
2215         }
2216         ifree(name);
2217         return 0;
2218 }
2219
2220 static long
2221 eitol(i)
2222 const int       i;
2223 {
2224         long    l;
2225
2226         l = i;
2227         if ((i < 0 && l >= 0) || (i == 0 && l != 0) || (i > 0 && l <= 0)) {
2228                 (void) fprintf(stderr,
2229                         _("%s: %d did not sign extend correctly\n"),
2230                         progname, i);
2231                 (void) exit(EXIT_FAILURE);
2232         }
2233         return l;
2234 }
2235
2236 /*
2237 ** UNIX was a registered trademark of UNIX System Laboratories in 1993.
2238 */