(before-compile): Add $(objpfx)banner.h.
[kopensolaris-gnu/glibc.git] / timezone / zic.c
1 #ifndef lint
2 #ifndef NOID
3 static char     elsieid[] = "@(#)zic.c  7.107";
4 #endif /* !defined NOID */
5 #endif /* !defined lint */
6
7 #include "private.h"
8 #include "locale.h"
9 #include "tzfile.h"
10
11 #if HAVE_SYS_STAT_H
12 #include "sys/stat.h"
13 #endif
14 #ifdef S_IRUSR
15 #define MKDIR_UMASK (S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH)
16 #else
17 #define MKDIR_UMASK 0755
18 #endif
19
20 /*
21 ** On some ancient hosts, predicates like `isspace(C)' are defined
22 ** only if isascii(C) || C == EOF.  Modern hosts obey the C Standard,
23 ** which says they are defined only if C == ((unsigned char) C) || C == EOF.
24 ** Neither the C Standard nor Posix require that `isascii' exist.
25 ** For portability, we check both ancient and modern requirements.
26 ** If isascii is not defined, the isascii check succeeds trivially.
27 */
28 #include "ctype.h"
29 #ifndef isascii
30 #define isascii(x) 1
31 #endif
32
33 struct rule {
34         const char *    r_filename;
35         int             r_linenum;
36         const char *    r_name;
37
38         int             r_loyear;       /* for example, 1986 */
39         int             r_hiyear;       /* for example, 1986 */
40         const char *    r_yrtype;
41
42         int             r_month;        /* 0..11 */
43
44         int             r_dycode;       /* see below */
45         int             r_dayofmonth;
46         int             r_wday;
47
48         long            r_tod;          /* time from midnight */
49         int             r_todisstd;     /* above is standard time if TRUE */
50                                         /* or wall clock time if FALSE */
51         int             r_todisgmt;     /* above is GMT if TRUE */
52                                         /* or local time if FALSE */
53         long            r_stdoff;       /* offset from standard time */
54         const char *    r_abbrvar;      /* variable part of abbreviation */
55
56         int             r_todo;         /* a rule to do (used in outzone) */
57         time_t          r_temp;         /* used in outzone */
58 };
59
60 /*
61 **      r_dycode                r_dayofmonth    r_wday
62 */
63
64 #define DC_DOM          0       /* 1..31 */     /* unused */
65 #define DC_DOWGEQ       1       /* 1..31 */     /* 0..6 (Sun..Sat) */
66 #define DC_DOWLEQ       2       /* 1..31 */     /* 0..6 (Sun..Sat) */
67
68 struct zone {
69         const char *    z_filename;
70         int             z_linenum;
71
72         const char *    z_name;
73         long            z_gmtoff;
74         const char *    z_rule;
75         const char *    z_format;
76
77         long            z_stdoff;
78
79         struct rule *   z_rules;
80         int             z_nrules;
81
82         struct rule     z_untilrule;
83         time_t          z_untiltime;
84 };
85
86 extern int      getopt P((int argc, char * const argv[],
87                         const char * options));
88 extern int      link P((const char * fromname, const char * toname));
89 extern char *   optarg;
90 extern int      optind;
91
92 static void     addtt P((time_t starttime, int type));
93 static int      addtype P((long gmtoff, const char * abbr, int isdst,
94                                 int ttisstd, int ttisgmt));
95 static void     leapadd P((time_t t, int positive, int rolling, int count));
96 static void     adjleap P((void));
97 static void     associate P((void));
98 static int      ciequal P((const char * ap, const char * bp));
99 static void     convert P((long val, char * buf));
100 static void     dolink P((const char * fromfile, const char * tofile));
101 static void     doabbr P((char * abbr, const char * format,
102                         const char * letters, int isdst));
103 static void     eat P((const char * name, int num));
104 static void     eats P((const char * name, int num,
105                         const char * rname, int rnum));
106 static long     eitol P((int i));
107 static void     error P((const char * message));
108 static char **  getfields P((char * buf));
109 static long     gethms P((const char * string, const char * errstrng,
110                         int signable));
111 static void     infile P((const char * filename));
112 static void     inleap P((char ** fields, int nfields));
113 static void     inlink P((char ** fields, int nfields));
114 static void     inrule P((char ** fields, int nfields));
115 static int      inzcont P((char ** fields, int nfields));
116 static int      inzone P((char ** fields, int nfields));
117 static int      inzsub P((char ** fields, int nfields, int iscont));
118 static int      itsabbr P((const char * abbr, const char * word));
119 static int      itsdir P((const char * name));
120 static int      lowerit P((int c));
121 static char *   memcheck P((char * tocheck));
122 static int      mkdirs P((char * filename));
123 static void     newabbr P((const char * abbr));
124 static long     oadd P((long t1, long t2));
125 static void     outzone P((const struct zone * zp, int ntzones));
126 static void     puttzcode P((long code, FILE * fp));
127 static int      rcomp P((const void * leftp, const void * rightp));
128 static time_t   rpytime P((const struct rule * rp, int wantedy));
129 static void     rulesub P((struct rule * rp,
130                         const char * loyearp, const char * hiyearp,
131                         const char * typep, const char * monthp,
132                         const char * dayp, const char * timep));
133 static void     setboundaries P((void));
134 static time_t   tadd P((time_t t1, long t2));
135 static void     usage P((void));
136 static void     writezone P((const char * name));
137 static int      yearistype P((int year, const char * type));
138
139 #if !(HAVE_STRERROR - 0)
140 static char *   strerror P((int));
141 #endif /* !(HAVE_STRERROR - 0) */
142
143 static int              charcnt;
144 static int              errors;
145 static const char *     filename;
146 static int              leapcnt;
147 static int              linenum;
148 static time_t           max_time;
149 static int              max_year;
150 static int              max_year_representable;
151 static time_t           min_time;
152 static int              min_year;
153 static int              min_year_representable;
154 static int              noise;
155 static const char *     rfilename;
156 static int              rlinenum;
157 static const char *     progname;
158 static int              timecnt;
159 static int              typecnt;
160
161 /*
162 ** Line codes.
163 */
164
165 #define LC_RULE         0
166 #define LC_ZONE         1
167 #define LC_LINK         2
168 #define LC_LEAP         3
169
170 /*
171 ** Which fields are which on a Zone line.
172 */
173
174 #define ZF_NAME         1
175 #define ZF_GMTOFF       2
176 #define ZF_RULE         3
177 #define ZF_FORMAT       4
178 #define ZF_TILYEAR      5
179 #define ZF_TILMONTH     6
180 #define ZF_TILDAY       7
181 #define ZF_TILTIME      8
182 #define ZONE_MINFIELDS  5
183 #define ZONE_MAXFIELDS  9
184
185 /*
186 ** Which fields are which on a Zone continuation line.
187 */
188
189 #define ZFC_GMTOFF      0
190 #define ZFC_RULE        1
191 #define ZFC_FORMAT      2
192 #define ZFC_TILYEAR     3
193 #define ZFC_TILMONTH    4
194 #define ZFC_TILDAY      5
195 #define ZFC_TILTIME     6
196 #define ZONEC_MINFIELDS 3
197 #define ZONEC_MAXFIELDS 7
198
199 /*
200 ** Which files are which on a Rule line.
201 */
202
203 #define RF_NAME         1
204 #define RF_LOYEAR       2
205 #define RF_HIYEAR       3
206 #define RF_COMMAND      4
207 #define RF_MONTH        5
208 #define RF_DAY          6
209 #define RF_TOD          7
210 #define RF_STDOFF       8
211 #define RF_ABBRVAR      9
212 #define RULE_FIELDS     10
213
214 /*
215 ** Which fields are which on a Link line.
216 */
217
218 #define LF_FROM         1
219 #define LF_TO           2
220 #define LINK_FIELDS     3
221
222 /*
223 ** Which fields are which on a Leap line.
224 */
225
226 #define LP_YEAR         1
227 #define LP_MONTH        2
228 #define LP_DAY          3
229 #define LP_TIME         4
230 #define LP_CORR         5
231 #define LP_ROLL         6
232 #define LEAP_FIELDS     7
233
234 /*
235 ** Year synonyms.
236 */
237
238 #define YR_MINIMUM      0
239 #define YR_MAXIMUM      1
240 #define YR_ONLY         2
241
242 static struct rule *    rules;
243 static int              nrules; /* number of rules */
244
245 static struct zone *    zones;
246 static int              nzones; /* number of zones */
247
248 struct link {
249         const char *    l_filename;
250         int             l_linenum;
251         const char *    l_from;
252         const char *    l_to;
253 };
254
255 static struct link *    links;
256 static int              nlinks;
257
258 struct lookup {
259         const char *    l_word;
260         const int       l_value;
261 };
262
263 static struct lookup const *    byword P((const char * string,
264                                         const struct lookup * lp));
265
266 static struct lookup const      line_codes[] = {
267         { "Rule",       LC_RULE },
268         { "Zone",       LC_ZONE },
269         { "Link",       LC_LINK },
270         { "Leap",       LC_LEAP },
271         { NULL,         0}
272 };
273
274 static struct lookup const      mon_names[] = {
275         { "January",    TM_JANUARY },
276         { "February",   TM_FEBRUARY },
277         { "March",      TM_MARCH },
278         { "April",      TM_APRIL },
279         { "May",        TM_MAY },
280         { "June",       TM_JUNE },
281         { "July",       TM_JULY },
282         { "August",     TM_AUGUST },
283         { "September",  TM_SEPTEMBER },
284         { "October",    TM_OCTOBER },
285         { "November",   TM_NOVEMBER },
286         { "December",   TM_DECEMBER },
287         { NULL,         0 }
288 };
289
290 static struct lookup const      wday_names[] = {
291         { "Sunday",     TM_SUNDAY },
292         { "Monday",     TM_MONDAY },
293         { "Tuesday",    TM_TUESDAY },
294         { "Wednesday",  TM_WEDNESDAY },
295         { "Thursday",   TM_THURSDAY },
296         { "Friday",     TM_FRIDAY },
297         { "Saturday",   TM_SATURDAY },
298         { NULL,         0 }
299 };
300
301 static struct lookup const      lasts[] = {
302         { "last-Sunday",        TM_SUNDAY },
303         { "last-Monday",        TM_MONDAY },
304         { "last-Tuesday",       TM_TUESDAY },
305         { "last-Wednesday",     TM_WEDNESDAY },
306         { "last-Thursday",      TM_THURSDAY },
307         { "last-Friday",        TM_FRIDAY },
308         { "last-Saturday",      TM_SATURDAY },
309         { NULL,                 0 }
310 };
311
312 static struct lookup const      begin_years[] = {
313         { "minimum",    YR_MINIMUM },
314         { "maximum",    YR_MAXIMUM },
315         { NULL,         0 }
316 };
317
318 static struct lookup const      end_years[] = {
319         { "minimum",    YR_MINIMUM },
320         { "maximum",    YR_MAXIMUM },
321         { "only",       YR_ONLY },
322         { NULL,         0 }
323 };
324
325 static struct lookup const      leap_types[] = {
326         { "Rolling",    TRUE },
327         { "Stationary", FALSE },
328         { NULL,         0 }
329 };
330
331 static const int        len_months[2][MONSPERYEAR] = {
332         { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
333         { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
334 };
335
336 static const int        len_years[2] = {
337         DAYSPERNYEAR, DAYSPERLYEAR
338 };
339
340 static struct attype {
341         time_t          at;
342         unsigned char   type;
343 }                       attypes[TZ_MAX_TIMES];
344 static long             gmtoffs[TZ_MAX_TYPES];
345 static char             isdsts[TZ_MAX_TYPES];
346 static unsigned char    abbrinds[TZ_MAX_TYPES];
347 static char             ttisstds[TZ_MAX_TYPES];
348 static char             ttisgmts[TZ_MAX_TYPES];
349 static char             chars[TZ_MAX_CHARS];
350 static time_t           trans[TZ_MAX_LEAPS];
351 static long             corr[TZ_MAX_LEAPS];
352 static char             roll[TZ_MAX_LEAPS];
353
354 /*
355 ** Memory allocation.
356 */
357
358 static char *
359 memcheck(ptr)
360 char * const    ptr;
361 {
362         if (ptr == NULL) {
363                 const char *e = strerror(errno);
364
365                 (void) fprintf(stderr, _("%s: Memory exhausted: %s\n"),
366                         progname, e);
367                 (void) exit(EXIT_FAILURE);
368         }
369         return ptr;
370 }
371
372 #define emalloc(size)           memcheck(imalloc(size))
373 #define erealloc(ptr, size)     memcheck(irealloc((ptr), (size)))
374 #define ecpyalloc(ptr)          memcheck(icpyalloc(ptr))
375 #define ecatalloc(oldp, newp)   memcheck(icatalloc((oldp), (newp)))
376
377 /*
378 ** Error handling.
379 */
380
381 #if !(HAVE_STRERROR - 0)
382 static char *
383 strerror(errnum)
384 int     errnum;
385 {
386         extern char *   sys_errlist[];
387         extern int      sys_nerr;
388
389         return (errnum > 0 && errnum <= sys_nerr) ?
390                 sys_errlist[errnum] : _("Unknown system error");
391 }
392 #endif /* !(HAVE_STRERROR - 0) */
393
394 static void
395 eats(name, num, rname, rnum)
396 const char * const      name;
397 const int               num;
398 const char * const      rname;
399 const int               rnum;
400 {
401         filename = name;
402         linenum = num;
403         rfilename = rname;
404         rlinenum = rnum;
405 }
406
407 static void
408 eat(name, num)
409 const char * const      name;
410 const int               num;
411 {
412         eats(name, num, (char *) NULL, -1);
413 }
414
415 static void
416 error(string)
417 const char * const      string;
418 {
419         /*
420         ** Match the format of "cc" to allow sh users to
421         **      zic ... 2>&1 | error -t "*" -v
422         ** on BSD systems.
423         */
424         (void) fprintf(stderr, _("\"%s\", line %d: %s"),
425                 filename, linenum, string);
426         if (rfilename != NULL)
427                 (void) fprintf(stderr, _(" (rule from \"%s\", line %d)"),
428                         rfilename, rlinenum);
429         (void) fprintf(stderr, "\n");
430         ++errors;
431 }
432
433 static void
434 warning(string)
435 const char * const      string;
436 {
437         char *  cp;
438
439         cp = ecpyalloc(_("warning: "));
440         cp = ecatalloc(cp, string);
441         error(cp);
442         ifree(cp);
443         --errors;
444 }
445
446 static void
447 usage P((void))
448 {
449         (void) fprintf(stderr, _("%s: usage is %s [ -s ] [ -v ] [ -l localtime ] [ -p posixrules ] \\\n\t[ -d directory ] [ -L leapseconds ] [ -y yearistype ] [ filename ... ]\n"),
450                 progname, progname);
451         (void) exit(EXIT_FAILURE);
452 }
453
454 static const char *     psxrules;
455 static const char *     lcltime;
456 static const char *     directory;
457 static const char *     leapsec;
458 static const char *     yitcommand;
459 static int              sflag = FALSE;
460
461 int
462 main(argc, argv)
463 int     argc;
464 char *  argv[];
465 {
466         register int    i;
467         register int    j;
468         register int    c;
469
470 #ifdef unix
471         (void) umask(umask(S_IWGRP | S_IWOTH) | (S_IWGRP | S_IWOTH));
472 #endif /* defined unix */
473 #if HAVE_GETTEXT - 0
474         (void) setlocale(LC_CTYPE, "");
475         (void) setlocale(LC_MESSAGES, "");
476 #ifdef TZ_DOMAINDIR
477         (void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR);
478 #endif /* defined TEXTDOMAINDIR */
479         (void) textdomain(TZ_DOMAIN);
480 #endif /* HAVE_GETTEXT - 0 */
481         progname = argv[0];
482         while ((c = getopt(argc, argv, "d:l:p:L:vsy:")) != EOF && c != -1)
483                 switch (c) {
484                         default:
485                                 usage();
486                         case 'd':
487                                 if (directory == NULL)
488                                         directory = optarg;
489                                 else {
490                                         (void) fprintf(stderr,
491 _("%s: More than one -d option specified\n"),
492                                                 progname);
493                                         (void) exit(EXIT_FAILURE);
494                                 }
495                                 break;
496                         case 'l':
497                                 if (lcltime == NULL)
498                                         lcltime = optarg;
499                                 else {
500                                         (void) fprintf(stderr,
501 _("%s: More than one -l option specified\n"),
502                                                 progname);
503                                         (void) exit(EXIT_FAILURE);
504                                 }
505                                 break;
506                         case 'p':
507                                 if (psxrules == NULL)
508                                         psxrules = optarg;
509                                 else {
510                                         (void) fprintf(stderr,
511 _("%s: More than one -p option specified\n"),
512                                                 progname);
513                                         (void) exit(EXIT_FAILURE);
514                                 }
515                                 break;
516                         case 'y':
517                                 if (yitcommand == NULL)
518                                         yitcommand = optarg;
519                                 else {
520                                         (void) fprintf(stderr,
521 _("%s: More than one -y option specified\n"),
522                                                 progname);
523                                         (void) exit(EXIT_FAILURE);
524                                 }
525                                 break;
526                         case 'L':
527                                 if (leapsec == NULL)
528                                         leapsec = optarg;
529                                 else {
530                                         (void) fprintf(stderr,
531 _("%s: More than one -L option specified\n"),
532                                                 progname);
533                                         (void) exit(EXIT_FAILURE);
534                                 }
535                                 break;
536                         case 'v':
537                                 noise = TRUE;
538                                 break;
539                         case 's':
540                                 sflag = TRUE;
541                                 break;
542                 }
543         if (optind == argc - 1 && strcmp(argv[optind], "=") == 0)
544                 usage();        /* usage message by request */
545         if (directory == NULL)
546                 directory = TZDIR;
547         if (yitcommand == NULL)
548                 yitcommand = "yearistype";
549
550         setboundaries();
551
552         if (optind < argc && leapsec != NULL) {
553                 infile(leapsec);
554                 adjleap();
555         }
556
557         for (i = optind; i < argc; ++i)
558                 infile(argv[i]);
559         if (errors)
560                 (void) exit(EXIT_FAILURE);
561         associate();
562         for (i = 0; i < nzones; i = j) {
563                 /*
564                 ** Find the next non-continuation zone entry.
565                 */
566                 for (j = i + 1; j < nzones && zones[j].z_name == NULL; ++j)
567                         continue;
568                 outzone(&zones[i], j - i);
569         }
570         /*
571         ** Make links.
572         */
573         for (i = 0; i < nlinks; ++i) {
574                 eat(links[i].l_filename, links[i].l_linenum);
575                 dolink(links[i].l_from, links[i].l_to);
576         }
577         if (lcltime != NULL) {
578                 eat("command line", 1);
579                 dolink(lcltime, TZDEFAULT);
580         }
581         if (psxrules != NULL) {
582                 eat("command line", 1);
583                 dolink(psxrules, TZDEFRULES);
584         }
585         return (errors == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
586 }
587
588 static void
589 dolink(fromfile, tofile)
590 const char * const      fromfile;
591 const char * const      tofile;
592 {
593         register char * fromname;
594         register char * toname;
595
596         if (fromfile[0] == '/')
597                 fromname = ecpyalloc(fromfile);
598         else {
599                 fromname = ecpyalloc(directory);
600                 fromname = ecatalloc(fromname, "/");
601                 fromname = ecatalloc(fromname, fromfile);
602         }
603         if (tofile[0] == '/')
604                 toname = ecpyalloc(tofile);
605         else {
606                 toname = ecpyalloc(directory);
607                 toname = ecatalloc(toname, "/");
608                 toname = ecatalloc(toname, tofile);
609         }
610         /*
611         ** We get to be careful here since
612         ** there's a fair chance of root running us.
613         */
614         if (!itsdir(toname))
615                 (void) remove(toname);
616         if (link(fromname, toname) != 0) {
617                 int     result;
618
619                 if (mkdirs(toname) != 0)
620                         (void) exit(EXIT_FAILURE);
621
622                 result = link(fromname, toname);
623 #if (HAVE_SYMLINK - 0)
624                 if (result != 0 &&
625                     access(fromname, F_OK) == 0 &&
626                     !itsdir(fromname)) {
627                         const char *s = tofile;
628                         register char * symlinkcontents = NULL;
629                         while ((s = strchr(s+1, '/')) != NULL)
630                                 symlinkcontents = ecatalloc(symlinkcontents, "../");
631                         symlinkcontents = ecatalloc(symlinkcontents, fromname);
632
633                         result = unlink(toname);
634                         if (result != 0 && errno != ENOENT) {
635                                 const char *e = strerror(errno);
636
637                                 (void) fprintf(stderr,
638                                                _("%s: Can't unlink  %s: %s\n"),
639                                                progname, toname, e);
640                                 (void) exit(EXIT_FAILURE);
641                         }
642
643                         result = symlink(symlinkcontents, toname);
644                         if (result == 0)
645 warning(_("hard link failed, symbolic link used"));
646                         ifree(symlinkcontents);
647                 }
648 #endif
649                 if (result != 0) {
650                         const char *e = strerror(errno);
651
652                         (void) fprintf(stderr,
653                                 _("%s: Can't link from %s to %s: %s\n"),
654                                 progname, fromname, toname, e);
655                         (void) exit(EXIT_FAILURE);
656                 }
657         }
658         ifree(fromname);
659         ifree(toname);
660 }
661
662 #ifndef INT_MAX
663 #define INT_MAX ((int) (((unsigned)~0)>>1))
664 #endif /* !defined INT_MAX */
665
666 #ifndef INT_MIN
667 #define INT_MIN ((int) ~(((unsigned)~0)>>1))
668 #endif /* !defined INT_MIN */
669
670 /*
671 ** The tz file format currently allows at most 32-bit quantities.
672 ** This restriction should be removed before signed 32-bit values
673 ** wrap around in 2038, but unfortunately this will require a
674 ** change to the tz file format.
675 */
676
677 #define MAX_BITS_IN_FILE        32
678 #define TIME_T_BITS_IN_FILE     ((TYPE_BIT(time_t) < MAX_BITS_IN_FILE) ? TYPE_BIT(time_t) : MAX_BITS_IN_FILE)
679
680 static void
681 setboundaries P((void))
682 {
683         if (TYPE_SIGNED(time_t)) {
684                 min_time = ~ (time_t) 0;
685                 min_time <<= TIME_T_BITS_IN_FILE - 1;
686                 max_time = ~ (time_t) 0 - min_time;
687                 if (sflag)
688                         min_time = 0;
689         } else {
690                 min_time = 0;
691                 max_time = 2 - sflag;
692                 max_time <<= TIME_T_BITS_IN_FILE - 1;
693                 --max_time;
694         }
695         min_year = TM_YEAR_BASE + gmtime(&min_time)->tm_year;
696         max_year = TM_YEAR_BASE + gmtime(&max_time)->tm_year;
697         min_year_representable = min_year;
698         max_year_representable = max_year;
699 }
700
701 static int
702 itsdir(name)
703 const char * const      name;
704 {
705         register char * myname;
706         register int    accres;
707
708         myname = ecpyalloc(name);
709         myname = ecatalloc(myname, "/.");
710         accres = access(myname, F_OK);
711         ifree(myname);
712         return accres == 0;
713 }
714
715 /*
716 ** Associate sets of rules with zones.
717 */
718
719 /*
720 ** Sort by rule name.
721 */
722
723 static int
724 rcomp(cp1, cp2)
725 const void *    cp1;
726 const void *    cp2;
727 {
728         return strcmp(((const struct rule *) cp1)->r_name,
729                 ((const struct rule *) cp2)->r_name);
730 }
731
732 static void
733 associate P((void))
734 {
735         register struct zone *  zp;
736         register struct rule *  rp;
737         register int            base, out;
738         register int            i, j;
739
740         if (nrules != 0) {
741                 (void) qsort((void *) rules, (size_t) nrules,
742                         (size_t) sizeof *rules, rcomp);
743                 for (i = 0; i < nrules - 1; ++i) {
744                         if (strcmp(rules[i].r_name,
745                                 rules[i + 1].r_name) != 0)
746                                         continue;
747                         if (strcmp(rules[i].r_filename,
748                                 rules[i + 1].r_filename) == 0)
749                                         continue;
750                         eat(rules[i].r_filename, rules[i].r_linenum);
751                         warning(_("same rule name in multiple files"));
752                         eat(rules[i + 1].r_filename, rules[i + 1].r_linenum);
753                         warning(_("same rule name in multiple files"));
754                         for (j = i + 2; j < nrules; ++j) {
755                                 if (strcmp(rules[i].r_name,
756                                         rules[j].r_name) != 0)
757                                                 break;
758                                 if (strcmp(rules[i].r_filename,
759                                         rules[j].r_filename) == 0)
760                                                 continue;
761                                 if (strcmp(rules[i + 1].r_filename,
762                                         rules[j].r_filename) == 0)
763                                                 continue;
764                                 break;
765                         }
766                         i = j - 1;
767                 }
768         }
769         for (i = 0; i < nzones; ++i) {
770                 zp = &zones[i];
771                 zp->z_rules = NULL;
772                 zp->z_nrules = 0;
773         }
774         for (base = 0; base < nrules; base = out) {
775                 rp = &rules[base];
776                 for (out = base + 1; out < nrules; ++out)
777                         if (strcmp(rp->r_name, rules[out].r_name) != 0)
778                                 break;
779                 for (i = 0; i < nzones; ++i) {
780                         zp = &zones[i];
781                         if (strcmp(zp->z_rule, rp->r_name) != 0)
782                                 continue;
783                         zp->z_rules = rp;
784                         zp->z_nrules = out - base;
785                 }
786         }
787         for (i = 0; i < nzones; ++i) {
788                 zp = &zones[i];
789                 if (zp->z_nrules == 0) {
790                         /*
791                         ** Maybe we have a local standard time offset.
792                         */
793                         eat(zp->z_filename, zp->z_linenum);
794                         zp->z_stdoff = gethms(zp->z_rule, _("unruly zone"),
795                                               TRUE);
796                         /*
797                         ** Note, though, that if there's no rule,
798                         ** a '%s' in the format is a bad thing.
799                         */
800                         if (strchr(zp->z_format, '%') != 0)
801                                 error(_("%s in ruleless zone"));
802                 }
803         }
804         if (errors)
805                 (void) exit(EXIT_FAILURE);
806 }
807
808 static void
809 infile(name)
810 const char *    name;
811 {
812         register FILE *                 fp;
813         register char **                fields;
814         register char *                 cp;
815         register const struct lookup *  lp;
816         register int                    nfields;
817         register int                    wantcont;
818         register int                    num;
819         char                            buf[BUFSIZ];
820
821         if (strcmp(name, "-") == 0) {
822                 name = _("standard input");
823                 fp = stdin;
824         } else if ((fp = fopen(name, "r")) == NULL) {
825                 const char *e = strerror(errno);
826
827                 (void) fprintf(stderr, _("%s: Can't open %s: %s\n"),
828                         progname, name, e);
829                 (void) exit(EXIT_FAILURE);
830         }
831         wantcont = FALSE;
832         for (num = 1; ; ++num) {
833                 eat(name, num);
834                 if (fgets(buf, (int) sizeof buf, fp) != buf)
835                         break;
836                 cp = strchr(buf, '\n');
837                 if (cp == NULL) {
838                         error(_("line too long"));
839                         (void) exit(EXIT_FAILURE);
840                 }
841                 *cp = '\0';
842                 fields = getfields(buf);
843                 nfields = 0;
844                 while (fields[nfields] != NULL) {
845                         static char     nada;
846
847                         if (strcmp(fields[nfields], "-") == 0)
848                                 fields[nfields] = &nada;
849                         ++nfields;
850                 }
851                 if (nfields == 0) {
852                         /* nothing to do */
853                 } else if (wantcont) {
854                         wantcont = inzcont(fields, nfields);
855                 } else {
856                         lp = byword(fields[0], line_codes);
857                         if (lp == NULL)
858                                 error(_("input line of unknown type"));
859                         else switch ((int) (lp->l_value)) {
860                                 case LC_RULE:
861                                         inrule(fields, nfields);
862                                         wantcont = FALSE;
863                                         break;
864                                 case LC_ZONE:
865                                         wantcont = inzone(fields, nfields);
866                                         break;
867                                 case LC_LINK:
868                                         inlink(fields, nfields);
869                                         wantcont = FALSE;
870                                         break;
871                                 case LC_LEAP:
872                                         if (name != leapsec)
873                                                 (void) fprintf(stderr,
874 _("%s: Leap line in non leap seconds file %s\n"),
875                                                         progname, name);
876                                         else    inleap(fields, nfields);
877                                         wantcont = FALSE;
878                                         break;
879                                 default:        /* "cannot happen" */
880                                         (void) fprintf(stderr,
881 _("%s: panic: Invalid l_value %d\n"),
882                                                 progname, lp->l_value);
883                                         (void) exit(EXIT_FAILURE);
884                         }
885                 }
886                 ifree((char *) fields);
887         }
888         if (ferror(fp)) {
889                 (void) fprintf(stderr, _("%s: Error reading %s\n"),
890                         progname, filename);
891                 (void) exit(EXIT_FAILURE);
892         }
893         if (fp != stdin && fclose(fp)) {
894                 const char *e = strerror(errno);
895
896                 (void) fprintf(stderr, _("%s: Error closing %s: %s\n"),
897                         progname, filename, e);
898                 (void) exit(EXIT_FAILURE);
899         }
900         if (wantcont)
901                 error(_("expected continuation line not found"));
902 }
903
904 /*
905 ** Convert a string of one of the forms
906 **      h       -h      hh:mm   -hh:mm  hh:mm:ss        -hh:mm:ss
907 ** into a number of seconds.
908 ** A null string maps to zero.
909 ** Call error with errstring and return zero on errors.
910 */
911
912 static long
913 gethms(string, errstring, signable)
914 const char *            string;
915 const char * const      errstring;
916 const int               signable;
917 {
918         int     hh, mm, ss, sign;
919
920         if (string == NULL || *string == '\0')
921                 return 0;
922         if (!signable)
923                 sign = 1;
924         else if (*string == '-') {
925                 sign = -1;
926                 ++string;
927         } else  sign = 1;
928         if (sscanf(string, scheck(string, "%d"), &hh) == 1)
929                 mm = ss = 0;
930         else if (sscanf(string, scheck(string, "%d:%d"), &hh, &mm) == 2)
931                 ss = 0;
932         else if (sscanf(string, scheck(string, "%d:%d:%d"),
933                 &hh, &mm, &ss) != 3) {
934                         error(errstring);
935                         return 0;
936         }
937         if ((hh < 0 || hh >= HOURSPERDAY ||
938                 mm < 0 || mm >= MINSPERHOUR ||
939                 ss < 0 || ss > SECSPERMIN) &&
940                 !(hh == HOURSPERDAY && mm == 0 && ss == 0)) {
941                         error(errstring);
942                         return 0;
943         }
944         return eitol(sign) *
945                 (eitol(hh * MINSPERHOUR + mm) *
946                 eitol(SECSPERMIN) + eitol(ss));
947 }
948
949 static void
950 inrule(fields, nfields)
951 register char ** const  fields;
952 const int               nfields;
953 {
954         static struct rule      r;
955
956         if (nfields != RULE_FIELDS) {
957                 error(_("wrong number of fields on Rule line"));
958                 return;
959         }
960         if (*fields[RF_NAME] == '\0') {
961                 error(_("nameless rule"));
962                 return;
963         }
964         r.r_filename = filename;
965         r.r_linenum = linenum;
966         r.r_stdoff = gethms(fields[RF_STDOFF], _("invalid saved time"), TRUE);
967         rulesub(&r, fields[RF_LOYEAR], fields[RF_HIYEAR], fields[RF_COMMAND],
968                 fields[RF_MONTH], fields[RF_DAY], fields[RF_TOD]);
969         r.r_name = ecpyalloc(fields[RF_NAME]);
970         r.r_abbrvar = ecpyalloc(fields[RF_ABBRVAR]);
971         rules = (struct rule *) (void *) erealloc((char *) rules,
972                 (int) ((nrules + 1) * sizeof *rules));
973         rules[nrules++] = r;
974 }
975
976 static int
977 inzone(fields, nfields)
978 register char ** const  fields;
979 const int               nfields;
980 {
981         register int    i;
982         static char *   buf;
983
984         if (nfields < ZONE_MINFIELDS || nfields > ZONE_MAXFIELDS) {
985                 error(_("wrong number of fields on Zone line"));
986                 return FALSE;
987         }
988         if (strcmp(fields[ZF_NAME], TZDEFAULT) == 0 && lcltime != NULL) {
989                 buf = erealloc(buf, (int) (132 + strlen(TZDEFAULT)));
990                 (void) sprintf(buf,
991 _("\"Zone %s\" line and -l option are mutually exclusive"),
992                         TZDEFAULT);
993                 error(buf);
994                 return FALSE;
995         }
996         if (strcmp(fields[ZF_NAME], TZDEFRULES) == 0 && psxrules != NULL) {
997                 buf = erealloc(buf, (int) (132 + strlen(TZDEFRULES)));
998                 (void) sprintf(buf,
999 _("\"Zone %s\" line and -p option are mutually exclusive"),
1000                         TZDEFRULES);
1001                 error(buf);
1002                 return FALSE;
1003         }
1004         for (i = 0; i < nzones; ++i)
1005                 if (zones[i].z_name != NULL &&
1006                         strcmp(zones[i].z_name, fields[ZF_NAME]) == 0) {
1007                                 buf = erealloc(buf, (int) (132 +
1008                                         strlen(fields[ZF_NAME]) +
1009                                         strlen(zones[i].z_filename)));
1010                                 (void) sprintf(buf,
1011 _("duplicate zone name %s (file \"%s\", line %d)"),
1012                                         fields[ZF_NAME],
1013                                         zones[i].z_filename,
1014                                         zones[i].z_linenum);
1015                                 error(buf);
1016                                 return FALSE;
1017                 }
1018         return inzsub(fields, nfields, FALSE);
1019 }
1020
1021 static int
1022 inzcont(fields, nfields)
1023 register char ** const  fields;
1024 const int               nfields;
1025 {
1026         if (nfields < ZONEC_MINFIELDS || nfields > ZONEC_MAXFIELDS) {
1027                 error(_("wrong number of fields on Zone continuation line"));
1028                 return FALSE;
1029         }
1030         return inzsub(fields, nfields, TRUE);
1031 }
1032
1033 static int
1034 inzsub(fields, nfields, iscont)
1035 register char ** const  fields;
1036 const int               nfields;
1037 const int               iscont;
1038 {
1039         register char *         cp;
1040         static struct zone      z;
1041         register int            i_gmtoff, i_rule, i_format;
1042         register int            i_untilyear, i_untilmonth;
1043         register int            i_untilday, i_untiltime;
1044         register int            hasuntil;
1045
1046         if (iscont) {
1047                 i_gmtoff = ZFC_GMTOFF;
1048                 i_rule = ZFC_RULE;
1049                 i_format = ZFC_FORMAT;
1050                 i_untilyear = ZFC_TILYEAR;
1051                 i_untilmonth = ZFC_TILMONTH;
1052                 i_untilday = ZFC_TILDAY;
1053                 i_untiltime = ZFC_TILTIME;
1054                 z.z_name = NULL;
1055         } else {
1056                 i_gmtoff = ZF_GMTOFF;
1057                 i_rule = ZF_RULE;
1058                 i_format = ZF_FORMAT;
1059                 i_untilyear = ZF_TILYEAR;
1060                 i_untilmonth = ZF_TILMONTH;
1061                 i_untilday = ZF_TILDAY;
1062                 i_untiltime = ZF_TILTIME;
1063                 z.z_name = ecpyalloc(fields[ZF_NAME]);
1064         }
1065         z.z_filename = filename;
1066         z.z_linenum = linenum;
1067         z.z_gmtoff = gethms(fields[i_gmtoff], _("invalid UTC offset"), TRUE);
1068         if ((cp = strchr(fields[i_format], '%')) != 0) {
1069                 if (*++cp != 's' || strchr(cp, '%') != 0) {
1070                         error(_("invalid abbreviation format"));
1071                         return FALSE;
1072                 }
1073         }
1074         z.z_rule = ecpyalloc(fields[i_rule]);
1075         z.z_format = ecpyalloc(fields[i_format]);
1076         hasuntil = nfields > i_untilyear;
1077         if (hasuntil) {
1078                 z.z_untilrule.r_filename = filename;
1079                 z.z_untilrule.r_linenum = linenum;
1080                 rulesub(&z.z_untilrule,
1081                         fields[i_untilyear],
1082                         "only",
1083                         "",
1084                         (nfields > i_untilmonth) ?
1085                         fields[i_untilmonth] : "Jan",
1086                         (nfields > i_untilday) ? fields[i_untilday] : "1",
1087                         (nfields > i_untiltime) ? fields[i_untiltime] : "0");
1088                 z.z_untiltime = rpytime(&z.z_untilrule,
1089                         z.z_untilrule.r_loyear);
1090                 if (iscont && nzones > 0 &&
1091                         z.z_untiltime > min_time &&
1092                         z.z_untiltime < max_time &&
1093                         zones[nzones - 1].z_untiltime > min_time &&
1094                         zones[nzones - 1].z_untiltime < max_time &&
1095                         zones[nzones - 1].z_untiltime >= z.z_untiltime) {
1096                                 error(_("Zone continuation line end time is not after end time of previous line"));
1097                                 return FALSE;
1098                 }
1099         }
1100         zones = (struct zone *) (void *) erealloc((char *) zones,
1101                 (int) ((nzones + 1) * sizeof *zones));
1102         zones[nzones++] = z;
1103         /*
1104         ** If there was an UNTIL field on this line,
1105         ** there's more information about the zone on the next line.
1106         */
1107         return hasuntil;
1108 }
1109
1110 static void
1111 inleap(fields, nfields)
1112 register char ** const  fields;
1113 const int               nfields;
1114 {
1115         register const char *           cp;
1116         register const struct lookup *  lp;
1117         register int                    i, j;
1118         int                             year, month, day;
1119         long                            dayoff, tod;
1120         time_t                          t;
1121
1122         if (nfields != LEAP_FIELDS) {
1123                 error(_("wrong number of fields on Leap line"));
1124                 return;
1125         }
1126         dayoff = 0;
1127         cp = fields[LP_YEAR];
1128         if (sscanf(cp, scheck(cp, "%d"), &year) != 1) {
1129                         /*
1130                          * Leapin' Lizards!
1131                          */
1132                         error(_("invalid leaping year"));
1133                         return;
1134         }
1135         j = EPOCH_YEAR;
1136         while (j != year) {
1137                 if (year > j) {
1138                         i = len_years[isleap(j)];
1139                         ++j;
1140                 } else {
1141                         --j;
1142                         i = -len_years[isleap(j)];
1143                 }
1144                 dayoff = oadd(dayoff, eitol(i));
1145         }
1146         if ((lp = byword(fields[LP_MONTH], mon_names)) == NULL) {
1147                 error(_("invalid month name"));
1148                 return;
1149         }
1150         month = lp->l_value;
1151         j = TM_JANUARY;
1152         while (j != month) {
1153                 i = len_months[isleap(year)][j];
1154                 dayoff = oadd(dayoff, eitol(i));
1155                 ++j;
1156         }
1157         cp = fields[LP_DAY];
1158         if (sscanf(cp, scheck(cp, "%d"), &day) != 1 ||
1159                 day <= 0 || day > len_months[isleap(year)][month]) {
1160                         error(_("invalid day of month"));
1161                         return;
1162         }
1163         dayoff = oadd(dayoff, eitol(day - 1));
1164         if (dayoff < 0 && !TYPE_SIGNED(time_t)) {
1165                 error(_("time before zero"));
1166                 return;
1167         }
1168         t = (time_t) dayoff * SECSPERDAY;
1169         /*
1170         ** Cheap overflow check.
1171         */
1172         if (t / SECSPERDAY != dayoff) {
1173                 error(_("time overflow"));
1174                 return;
1175         }
1176         tod = gethms(fields[LP_TIME], _("invalid time of day"), FALSE);
1177         cp = fields[LP_CORR];
1178         {
1179                 register int    positive;
1180                 int             count;
1181
1182                 if (strcmp(cp, "") == 0) { /* infile() turns "-" into "" */
1183                         positive = FALSE;
1184                         count = 1;
1185                 } else if (strcmp(cp, "--") == 0) {
1186                         positive = FALSE;
1187                         count = 2;
1188                 } else if (strcmp(cp, "+") == 0) {
1189                         positive = TRUE;
1190                         count = 1;
1191                 } else if (strcmp(cp, "++") == 0) {
1192                         positive = TRUE;
1193                         count = 2;
1194                 } else {
1195                         error(_("illegal CORRECTION field on Leap line"));
1196                         return;
1197                 }
1198                 if ((lp = byword(fields[LP_ROLL], leap_types)) == NULL) {
1199                         error(_("illegal Rolling/Stationary field on Leap line"));
1200                         return;
1201                 }
1202                 leapadd(tadd(t, tod), positive, lp->l_value, count);
1203         }
1204 }
1205
1206 static void
1207 inlink(fields, nfields)
1208 register char ** const  fields;
1209 const int               nfields;
1210 {
1211         struct link     l;
1212
1213         if (nfields != LINK_FIELDS) {
1214                 error(_("wrong number of fields on Link line"));
1215                 return;
1216         }
1217         if (*fields[LF_FROM] == '\0') {
1218                 error(_("blank FROM field on Link line"));
1219                 return;
1220         }
1221         if (*fields[LF_TO] == '\0') {
1222                 error(_("blank TO field on Link line"));
1223                 return;
1224         }
1225         l.l_filename = filename;
1226         l.l_linenum = linenum;
1227         l.l_from = ecpyalloc(fields[LF_FROM]);
1228         l.l_to = ecpyalloc(fields[LF_TO]);
1229         links = (struct link *) (void *) erealloc((char *) links,
1230                 (int) ((nlinks + 1) * sizeof *links));
1231         links[nlinks++] = l;
1232 }
1233
1234 static void
1235 rulesub(rp, loyearp, hiyearp, typep, monthp, dayp, timep)
1236 register struct rule * const    rp;
1237 const char * const              loyearp;
1238 const char * const              hiyearp;
1239 const char * const              typep;
1240 const char * const              monthp;
1241 const char * const              dayp;
1242 const char * const              timep;
1243 {
1244         register const struct lookup *  lp;
1245         register const char *           cp;
1246         register char *                 dp;
1247         register char *                 ep;
1248
1249         if ((lp = byword(monthp, mon_names)) == NULL) {
1250                 error(_("invalid month name"));
1251                 return;
1252         }
1253         rp->r_month = lp->l_value;
1254         rp->r_todisstd = FALSE;
1255         rp->r_todisgmt = FALSE;
1256         dp = ecpyalloc(timep);
1257         if (*dp != '\0') {
1258                 ep = dp + strlen(dp) - 1;
1259                 switch (lowerit(*ep)) {
1260                         case 's':       /* Standard */
1261                                 rp->r_todisstd = TRUE;
1262                                 rp->r_todisgmt = FALSE;
1263                                 *ep = '\0';
1264                                 break;
1265                         case 'w':       /* Wall */
1266                                 rp->r_todisstd = FALSE;
1267                                 rp->r_todisgmt = FALSE;
1268                                 *ep = '\0';
1269                                 break;
1270                         case 'g':       /* Greenwich */
1271                         case 'u':       /* Universal */
1272                         case 'z':       /* Zulu */
1273                                 rp->r_todisstd = TRUE;
1274                                 rp->r_todisgmt = TRUE;
1275                                 *ep = '\0';
1276                                 break;
1277                 }
1278         }
1279         rp->r_tod = gethms(dp, _("invalid time of day"), FALSE);
1280         ifree(dp);
1281         /*
1282         ** Year work.
1283         */
1284         cp = loyearp;
1285         lp = byword(cp, begin_years);
1286         if (lp != NULL) switch ((int) lp->l_value) {
1287                 case YR_MINIMUM:
1288                         rp->r_loyear = INT_MIN;
1289                         break;
1290                 case YR_MAXIMUM:
1291                         rp->r_loyear = INT_MAX;
1292                         break;
1293                 default:        /* "cannot happen" */
1294                         (void) fprintf(stderr,
1295                                 _("%s: panic: Invalid l_value %d\n"),
1296                                 progname, lp->l_value);
1297                         (void) exit(EXIT_FAILURE);
1298         } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_loyear) != 1) {
1299                 error(_("invalid starting year"));
1300                 return;
1301         } else if (noise) {
1302                 if (rp->r_loyear < min_year_representable)
1303                         warning(_("starting year too low to be represented"));
1304                 else if (rp->r_loyear > max_year_representable)
1305                         warning(_("starting year too high to be represented"));
1306         }
1307         cp = hiyearp;
1308         if ((lp = byword(cp, end_years)) != NULL) switch ((int) lp->l_value) {
1309                 case YR_MINIMUM:
1310                         rp->r_hiyear = INT_MIN;
1311                         break;
1312                 case YR_MAXIMUM:
1313                         rp->r_hiyear = INT_MAX;
1314                         break;
1315                 case YR_ONLY:
1316                         rp->r_hiyear = rp->r_loyear;
1317                         break;
1318                 default:        /* "cannot happen" */
1319                         (void) fprintf(stderr,
1320                                 _("%s: panic: Invalid l_value %d\n"),
1321                                 progname, lp->l_value);
1322                         (void) exit(EXIT_FAILURE);
1323         } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_hiyear) != 1) {
1324                 error(_("invalid ending year"));
1325                 return;
1326         } else if (noise) {
1327                 if (rp->r_loyear < min_year_representable)
1328                         warning(_("starting year too low to be represented"));
1329                 else if (rp->r_loyear > max_year_representable)
1330                         warning(_("starting year too high to be represented"));
1331         }
1332         if (rp->r_loyear > rp->r_hiyear) {
1333                 error(_("starting year greater than ending year"));
1334                 return;
1335         }
1336         if (*typep == '\0')
1337                 rp->r_yrtype = NULL;
1338         else {
1339                 if (rp->r_loyear == rp->r_hiyear) {
1340                         error(_("typed single year"));
1341                         return;
1342                 }
1343                 rp->r_yrtype = ecpyalloc(typep);
1344         }
1345         if (rp->r_loyear < min_year && rp->r_loyear > 0)
1346                 min_year = rp->r_loyear;
1347         /*
1348         ** Day work.
1349         ** Accept things such as:
1350         **      1
1351         **      last-Sunday
1352         **      Sun<=20
1353         **      Sun>=7
1354         */
1355         dp = ecpyalloc(dayp);
1356         if ((lp = byword(dp, lasts)) != NULL) {
1357                 rp->r_dycode = DC_DOWLEQ;
1358                 rp->r_wday = lp->l_value;
1359                 rp->r_dayofmonth = len_months[1][rp->r_month];
1360         } else {
1361                 if ((ep = strchr(dp, '<')) != 0)
1362                         rp->r_dycode = DC_DOWLEQ;
1363                 else if ((ep = strchr(dp, '>')) != 0)
1364                         rp->r_dycode = DC_DOWGEQ;
1365                 else {
1366                         ep = dp;
1367                         rp->r_dycode = DC_DOM;
1368                 }
1369                 if (rp->r_dycode != DC_DOM) {
1370                         *ep++ = 0;
1371                         if (*ep++ != '=') {
1372                                 error(_("invalid day of month"));
1373                                 ifree(dp);
1374                                 return;
1375                         }
1376                         if ((lp = byword(dp, wday_names)) == NULL) {
1377                                 error(_("invalid weekday name"));
1378                                 ifree(dp);
1379                                 return;
1380                         }
1381                         rp->r_wday = lp->l_value;
1382                 }
1383                 if (sscanf(ep, scheck(ep, "%d"), &rp->r_dayofmonth) != 1 ||
1384                         rp->r_dayofmonth <= 0 ||
1385                         (rp->r_dayofmonth > len_months[1][rp->r_month])) {
1386                                 error(_("invalid day of month"));
1387                                 ifree(dp);
1388                                 return;
1389                 }
1390         }
1391         ifree(dp);
1392 }
1393
1394 static void
1395 convert(val, buf)
1396 const long      val;
1397 char * const    buf;
1398 {
1399         register int    i;
1400         register long   shift;
1401
1402         for (i = 0, shift = 24; i < 4; ++i, shift -= 8)
1403                 buf[i] = val >> shift;
1404 }
1405
1406 static void
1407 puttzcode(val, fp)
1408 const long      val;
1409 FILE * const    fp;
1410 {
1411         char    buf[4];
1412
1413         convert(val, buf);
1414         (void) fwrite((void *) buf, (size_t) sizeof buf, (size_t) 1, fp);
1415 }
1416
1417 static int
1418 atcomp(avp, bvp)
1419 void *  avp;
1420 void *  bvp;
1421 {
1422         if (((struct attype *) avp)->at < ((struct attype *) bvp)->at)
1423                 return -1;
1424         else if (((struct attype *) avp)->at > ((struct attype *) bvp)->at)
1425                 return 1;
1426         else    return 0;
1427 }
1428
1429 static void
1430 writezone(name)
1431 const char * const      name;
1432 {
1433         register FILE *         fp;
1434         register int            i, j;
1435         static char *           fullname;
1436         static struct tzhead    tzh;
1437         time_t                  ats[TZ_MAX_TIMES];
1438         unsigned char           types[TZ_MAX_TIMES];
1439
1440         /*
1441         ** Sort.
1442         */
1443         if (timecnt > 1)
1444                 (void) qsort((void *) attypes, (size_t) timecnt,
1445                         (size_t) sizeof *attypes, atcomp);
1446         /*
1447         ** Optimize.
1448         */
1449         {
1450                 int     fromi;
1451                 int     toi;
1452
1453                 toi = 0;
1454                 fromi = 0;
1455                 while (fromi < timecnt && attypes[fromi].at < min_time)
1456                         ++fromi;
1457                 if (isdsts[0] == 0)
1458                         while (fromi < timecnt && attypes[fromi].type == 0)
1459                                 ++fromi;        /* handled by default rule */
1460                 for ( ; fromi < timecnt; ++fromi) {
1461                         if (toi != 0
1462                             && ((attypes[fromi].at
1463                                  + gmtoffs[attypes[toi - 1].type])
1464                                 <= (attypes[toi - 1].at
1465                                     + gmtoffs[toi == 1 ? 0
1466                                               : attypes[toi - 2].type]))) {
1467                                 attypes[toi - 1].type = attypes[fromi].type;
1468                                 continue;
1469                         }
1470                         if (toi == 0 ||
1471                                 attypes[toi - 1].type != attypes[fromi].type)
1472                                         attypes[toi++] = attypes[fromi];
1473                 }
1474                 timecnt = toi;
1475         }
1476         /*
1477         ** Transfer.
1478         */
1479         for (i = 0; i < timecnt; ++i) {
1480                 ats[i] = attypes[i].at;
1481                 types[i] = attypes[i].type;
1482         }
1483         fullname = erealloc(fullname,
1484                 (int) (strlen(directory) + 1 + strlen(name) + 1));
1485         (void) sprintf(fullname, "%s/%s", directory, name);
1486         /*
1487         ** Remove old file, if any, to snap links.
1488         */
1489         if (!itsdir(fullname) && remove(fullname) != 0 && errno != ENOENT) {
1490                 const char *e = strerror(errno);
1491
1492                 (void) fprintf(stderr, _("%s: Can't remove %s: %s\n"),
1493                         progname, fullname, e);
1494                 (void) exit(EXIT_FAILURE);
1495         }
1496         if ((fp = fopen(fullname, "wb")) == NULL) {
1497                 if (mkdirs(fullname) != 0)
1498                         (void) exit(EXIT_FAILURE);
1499                 if ((fp = fopen(fullname, "wb")) == NULL) {
1500                         const char *e = strerror(errno);
1501
1502                         (void) fprintf(stderr, _("%s: Can't create %s: %s\n"),
1503                                 progname, fullname, e);
1504                         (void) exit(EXIT_FAILURE);
1505                 }
1506         }
1507         convert(eitol(typecnt), tzh.tzh_ttisgmtcnt);
1508         convert(eitol(typecnt), tzh.tzh_ttisstdcnt);
1509         convert(eitol(leapcnt), tzh.tzh_leapcnt);
1510         convert(eitol(timecnt), tzh.tzh_timecnt);
1511         convert(eitol(typecnt), tzh.tzh_typecnt);
1512         convert(eitol(charcnt), tzh.tzh_charcnt);
1513         (void) strncpy(tzh.tzh_magic, TZ_MAGIC, sizeof tzh.tzh_magic);
1514 #define DO(field)       (void) fwrite((void *) tzh.field, (size_t) sizeof tzh.field, (size_t) 1, fp)
1515         DO(tzh_magic);
1516         DO(tzh_reserved);
1517         DO(tzh_ttisgmtcnt);
1518         DO(tzh_ttisstdcnt);
1519         DO(tzh_leapcnt);
1520         DO(tzh_timecnt);
1521         DO(tzh_typecnt);
1522         DO(tzh_charcnt);
1523 #undef DO
1524         for (i = 0; i < timecnt; ++i) {
1525                 j = leapcnt;
1526                 while (--j >= 0)
1527                         if (ats[i] >= trans[j]) {
1528                                 ats[i] = tadd(ats[i], corr[j]);
1529                                 break;
1530                         }
1531                 puttzcode((long) ats[i], fp);
1532         }
1533         if (timecnt > 0)
1534                 (void) fwrite((void *) types, (size_t) sizeof types[0],
1535                         (size_t) timecnt, fp);
1536         for (i = 0; i < typecnt; ++i) {
1537                 puttzcode((long) gmtoffs[i], fp);
1538                 (void) putc(isdsts[i], fp);
1539                 (void) putc(abbrinds[i], fp);
1540         }
1541         if (charcnt != 0)
1542                 (void) fwrite((void *) chars, (size_t) sizeof chars[0],
1543                         (size_t) charcnt, fp);
1544         for (i = 0; i < leapcnt; ++i) {
1545                 if (roll[i]) {
1546                         if (timecnt == 0 || trans[i] < ats[0]) {
1547                                 j = 0;
1548                                 while (isdsts[j])
1549                                         if (++j >= typecnt) {
1550                                                 j = 0;
1551                                                 break;
1552                                         }
1553                         } else {
1554                                 j = 1;
1555                                 while (j < timecnt && trans[i] >= ats[j])
1556                                         ++j;
1557                                 j = types[j - 1];
1558                         }
1559                         puttzcode((long) tadd(trans[i], -gmtoffs[j]), fp);
1560                 } else  puttzcode((long) trans[i], fp);
1561                 puttzcode((long) corr[i], fp);
1562         }
1563         for (i = 0; i < typecnt; ++i)
1564                 (void) putc(ttisstds[i], fp);
1565         for (i = 0; i < typecnt; ++i)
1566                 (void) putc(ttisgmts[i], fp);
1567         if (ferror(fp) || fclose(fp)) {
1568                 (void) fprintf(stderr, _("%s: Error writing %s\n"),
1569                         progname, fullname);
1570                 (void) exit(EXIT_FAILURE);
1571         }
1572 }
1573
1574 static void
1575 doabbr(abbr, format, letters, isdst)
1576 char * const            abbr;
1577 const char * const      format;
1578 const char * const      letters;
1579 const int               isdst;
1580 {
1581         if (strchr(format, '/') == NULL) {
1582                 if (letters == NULL)
1583                         (void) strcpy(abbr, format);
1584                 else    (void) sprintf(abbr, format, letters);
1585         } else if (isdst)
1586                 (void) strcpy(abbr, strchr(format, '/') + 1);
1587         else {
1588                 (void) strcpy(abbr, format);
1589                 *strchr(abbr, '/') = '\0';
1590         }
1591 }
1592
1593 static void
1594 outzone(zpfirst, zonecount)
1595 const struct zone * const       zpfirst;
1596 const int                       zonecount;
1597 {
1598         register const struct zone *    zp;
1599         register struct rule *          rp;
1600         register int                    i, j;
1601         register int                    usestart, useuntil;
1602         register time_t                 starttime, untiltime;
1603         register long                   gmtoff;
1604         register long                   stdoff;
1605         register int                    year;
1606         register long                   startoff;
1607         register int                    startttisstd;
1608         register int                    startttisgmt;
1609         register int                    type;
1610         char                            startbuf[BUFSIZ];
1611
1612         INITIALIZE(untiltime);
1613         INITIALIZE(starttime);
1614         /*
1615         ** Now. . .finally. . .generate some useful data!
1616         */
1617         timecnt = 0;
1618         typecnt = 0;
1619         charcnt = 0;
1620         /*
1621         ** Thanks to Earl Chew (earl@dnd.icp.nec.com.au)
1622         ** for noting the need to unconditionally initialize startttisstd.
1623         */
1624         startttisstd = FALSE;
1625         startttisgmt = FALSE;
1626         for (i = 0; i < zonecount; ++i) {
1627                 /*
1628                 ** A guess that may well be corrected later.
1629                 */
1630                 stdoff = 0;
1631                 zp = &zpfirst[i];
1632                 usestart = i > 0 && (zp - 1)->z_untiltime > min_time;
1633                 useuntil = i < (zonecount - 1);
1634                 if (useuntil && zp->z_untiltime <= min_time)
1635                         continue;
1636                 gmtoff = zp->z_gmtoff;
1637                 eat(zp->z_filename, zp->z_linenum);
1638                 *startbuf = '\0';
1639                 startoff = zp->z_gmtoff;
1640                 if (zp->z_nrules == 0) {
1641                         stdoff = zp->z_stdoff;
1642                         doabbr(startbuf, zp->z_format,
1643                                 (char *) NULL, stdoff != 0);
1644                         type = addtype(oadd(zp->z_gmtoff, stdoff),
1645                                 startbuf, stdoff != 0, startttisstd,
1646                                 startttisgmt);
1647                         if (usestart) {
1648                                 addtt(starttime, type);
1649                                 usestart = FALSE;
1650                         } else if (stdoff != 0)
1651                                 addtt(min_time, type);
1652                 } else for (year = min_year; year <= max_year; ++year) {
1653                         if (useuntil && year > zp->z_untilrule.r_hiyear)
1654                                 break;
1655                         /*
1656                         ** Mark which rules to do in the current year.
1657                         ** For those to do, calculate rpytime(rp, year);
1658                         */
1659                         for (j = 0; j < zp->z_nrules; ++j) {
1660                                 rp = &zp->z_rules[j];
1661                                 eats(zp->z_filename, zp->z_linenum,
1662                                         rp->r_filename, rp->r_linenum);
1663                                 rp->r_todo = year >= rp->r_loyear &&
1664                                                 year <= rp->r_hiyear &&
1665                                                 yearistype(year, rp->r_yrtype);
1666                                 if (rp->r_todo)
1667                                         rp->r_temp = rpytime(rp, year);
1668                         }
1669                         for ( ; ; ) {
1670                                 register int    k;
1671                                 register time_t jtime, ktime;
1672                                 register long   offset;
1673                                 char            buf[BUFSIZ];
1674
1675                                 INITIALIZE(ktime);
1676                                 if (useuntil) {
1677                                         /*
1678                                         ** Turn untiltime into UTC
1679                                         ** assuming the current gmtoff and
1680                                         ** stdoff values.
1681                                         */
1682                                         untiltime = zp->z_untiltime;
1683                                         if (!zp->z_untilrule.r_todisgmt)
1684                                                 untiltime = tadd(untiltime,
1685                                                         -gmtoff);
1686                                         if (!zp->z_untilrule.r_todisstd)
1687                                                 untiltime = tadd(untiltime,
1688                                                         -stdoff);
1689                                 }
1690                                 /*
1691                                 ** Find the rule (of those to do, if any)
1692                                 ** that takes effect earliest in the year.
1693                                 */
1694                                 k = -1;
1695                                 for (j = 0; j < zp->z_nrules; ++j) {
1696                                         rp = &zp->z_rules[j];
1697                                         if (!rp->r_todo)
1698                                                 continue;
1699                                         eats(zp->z_filename, zp->z_linenum,
1700                                                 rp->r_filename, rp->r_linenum);
1701                                         offset = rp->r_todisgmt ? 0 : gmtoff;
1702                                         if (!rp->r_todisstd)
1703                                                 offset = oadd(offset, stdoff);
1704                                         jtime = rp->r_temp;
1705                                         if (jtime == min_time ||
1706                                                 jtime == max_time)
1707                                                         continue;
1708                                         jtime = tadd(jtime, -offset);
1709                                         if (k < 0 || jtime < ktime) {
1710                                                 k = j;
1711                                                 ktime = jtime;
1712                                         }
1713                                 }
1714                                 if (k < 0)
1715                                         break;  /* go on to next year */
1716                                 rp = &zp->z_rules[k];
1717                                 rp->r_todo = FALSE;
1718                                 if (useuntil && ktime >= untiltime)
1719                                         break;
1720                                 stdoff = rp->r_stdoff;
1721                                 if (usestart && ktime == starttime)
1722                                         usestart = FALSE;
1723                                 if (usestart) {
1724                                         if (ktime < starttime) {
1725                                                 startoff = oadd(zp->z_gmtoff,
1726                                                         stdoff);
1727                                                 doabbr(startbuf, zp->z_format,
1728                                                         rp->r_abbrvar,
1729                                                         rp->r_stdoff != 0);
1730                                                 continue;
1731                                         }
1732                                         if (*startbuf == '\0' &&
1733                                             startoff == oadd(zp->z_gmtoff,
1734                                             stdoff)) {
1735                                                 doabbr(startbuf, zp->z_format,
1736                                                         rp->r_abbrvar,
1737                                                         rp->r_stdoff != 0);
1738                                         }
1739                                 }
1740                                 eats(zp->z_filename, zp->z_linenum,
1741                                         rp->r_filename, rp->r_linenum);
1742                                 doabbr(buf, zp->z_format, rp->r_abbrvar,
1743                                         rp->r_stdoff != 0);
1744                                 offset = oadd(zp->z_gmtoff, rp->r_stdoff);
1745                                 type = addtype(offset, buf, rp->r_stdoff != 0,
1746                                         rp->r_todisstd, rp->r_todisgmt);
1747                                 addtt(ktime, type);
1748                         }
1749                 }
1750                 if (usestart) {
1751                         if (*startbuf == '\0' &&
1752                                 zp->z_format != NULL &&
1753                                 strchr(zp->z_format, '%') == NULL &&
1754                                 strchr(zp->z_format, '/') == NULL)
1755                                         (void) strcpy(startbuf, zp->z_format);
1756                         eat(zp->z_filename, zp->z_linenum);
1757                         if (*startbuf == '\0')
1758 error(_("can't determine time zone abbreviation to use just after until time"));
1759                         else    addtt(starttime,
1760                                         addtype(startoff, startbuf,
1761                                                 startoff != zp->z_gmtoff,
1762                                                 startttisstd,
1763                                                 startttisgmt));
1764                 }
1765                 /*
1766                 ** Now we may get to set starttime for the next zone line.
1767                 */
1768                 if (useuntil) {
1769                         startttisstd = zp->z_untilrule.r_todisstd;
1770                         startttisgmt = zp->z_untilrule.r_todisgmt;
1771                         starttime = zp->z_untiltime;
1772                         if (!startttisstd)
1773                                 starttime = tadd(starttime, -stdoff);
1774                         if (!startttisgmt)
1775                                 starttime = tadd(starttime, -gmtoff);
1776                 }
1777         }
1778         writezone(zpfirst->z_name);
1779 }
1780
1781 static void
1782 addtt(starttime, type)
1783 const time_t    starttime;
1784 int             type;
1785 {
1786         if (starttime <= min_time ||
1787                 (timecnt == 1 && attypes[0].at < min_time)) {
1788                 gmtoffs[0] = gmtoffs[type];
1789                 isdsts[0] = isdsts[type];
1790                 ttisstds[0] = ttisstds[type];
1791                 ttisgmts[0] = ttisgmts[type];
1792                 if (abbrinds[type] != 0)
1793                         (void) strcpy(chars, &chars[abbrinds[type]]);
1794                 abbrinds[0] = 0;
1795                 charcnt = strlen(chars) + 1;
1796                 typecnt = 1;
1797                 timecnt = 0;
1798                 type = 0;
1799         }
1800         if (timecnt >= TZ_MAX_TIMES) {
1801                 error(_("too many transitions?!"));
1802                 (void) exit(EXIT_FAILURE);
1803         }
1804         attypes[timecnt].at = starttime;
1805         attypes[timecnt].type = type;
1806         ++timecnt;
1807 }
1808
1809 static int
1810 addtype(gmtoff, abbr, isdst, ttisstd, ttisgmt)
1811 const long              gmtoff;
1812 const char * const      abbr;
1813 const int               isdst;
1814 const int               ttisstd;
1815 const int               ttisgmt;
1816 {
1817         register int    i, j;
1818
1819         if (isdst != TRUE && isdst != FALSE) {
1820                 error(_("internal error - addtype called with bad isdst"));
1821                 (void) exit(EXIT_FAILURE);
1822         }
1823         if (ttisstd != TRUE && ttisstd != FALSE) {
1824                 error(_("internal error - addtype called with bad ttisstd"));
1825                 (void) exit(EXIT_FAILURE);
1826         }
1827         if (ttisgmt != TRUE && ttisgmt != FALSE) {
1828                 error(_("internal error - addtype called with bad ttisgmt"));
1829                 (void) exit(EXIT_FAILURE);
1830         }
1831         /*
1832         ** See if there's already an entry for this zone type.
1833         ** If so, just return its index.
1834         */
1835         for (i = 0; i < typecnt; ++i) {
1836                 if (gmtoff == gmtoffs[i] && isdst == isdsts[i] &&
1837                         strcmp(abbr, &chars[abbrinds[i]]) == 0 &&
1838                         ttisstd == ttisstds[i] &&
1839                         ttisgmt == ttisgmts[i])
1840                                 return i;
1841         }
1842         /*
1843         ** There isn't one; add a new one, unless there are already too
1844         ** many.
1845         */
1846         if (typecnt >= TZ_MAX_TYPES) {
1847                 error(_("too many local time types"));
1848                 (void) exit(EXIT_FAILURE);
1849         }
1850         gmtoffs[i] = gmtoff;
1851         isdsts[i] = isdst;
1852         ttisstds[i] = ttisstd;
1853         ttisgmts[i] = ttisgmt;
1854
1855         for (j = 0; j < charcnt; ++j)
1856                 if (strcmp(&chars[j], abbr) == 0)
1857                         break;
1858         if (j == charcnt)
1859                 newabbr(abbr);
1860         abbrinds[i] = j;
1861         ++typecnt;
1862         return i;
1863 }
1864
1865 static void
1866 leapadd(t, positive, rolling, count)
1867 const time_t    t;
1868 const int       positive;
1869 const int       rolling;
1870 int             count;
1871 {
1872         register int    i, j;
1873
1874         if (leapcnt + (positive ? count : 1) > TZ_MAX_LEAPS) {
1875                 error(_("too many leap seconds"));
1876                 (void) exit(EXIT_FAILURE);
1877         }
1878         for (i = 0; i < leapcnt; ++i)
1879                 if (t <= trans[i]) {
1880                         if (t == trans[i]) {
1881                                 error(_("repeated leap second moment"));
1882                                 (void) exit(EXIT_FAILURE);
1883                         }
1884                         break;
1885                 }
1886         do {
1887                 for (j = leapcnt; j > i; --j) {
1888                         trans[j] = trans[j - 1];
1889                         corr[j] = corr[j - 1];
1890                         roll[j] = roll[j - 1];
1891                 }
1892                 trans[i] = t;
1893                 corr[i] = positive ? 1L : eitol(-count);
1894                 roll[i] = rolling;
1895                 ++leapcnt;
1896         } while (positive && --count != 0);
1897 }
1898
1899 static void
1900 adjleap P((void))
1901 {
1902         register int    i;
1903         register long   last = 0;
1904
1905         /*
1906         ** propagate leap seconds forward
1907         */
1908         for (i = 0; i < leapcnt; ++i) {
1909                 trans[i] = tadd(trans[i], last);
1910                 last = corr[i] += last;
1911         }
1912 }
1913
1914 static int
1915 yearistype(year, type)
1916 const int               year;
1917 const char * const      type;
1918 {
1919         static char *   buf;
1920         int             result;
1921
1922         if (type == NULL || *type == '\0')
1923                 return TRUE;
1924         buf = erealloc(buf, (int) (132 + strlen(yitcommand) + strlen(type)));
1925         (void) sprintf(buf, "%s %d %s", yitcommand, year, type);
1926         result = system(buf);
1927         if (WIFEXITED(result)) switch (WEXITSTATUS(result)) {
1928                 case 0:
1929                         return TRUE;
1930                 case 1:
1931                         return FALSE;
1932         }
1933         error(_("Wild result from command execution"));
1934         (void) fprintf(stderr, _("%s: command was '%s', result was %d\n"),
1935                 progname, buf, result);
1936         for ( ; ; )
1937                 (void) exit(EXIT_FAILURE);
1938 }
1939
1940 static int
1941 lowerit(a)
1942 int     a;
1943 {
1944         a = (unsigned char) a;
1945         return (isascii(a) && isupper(a)) ? tolower(a) : a;
1946 }
1947
1948 static int
1949 ciequal(ap, bp)         /* case-insensitive equality */
1950 register const char *   ap;
1951 register const char *   bp;
1952 {
1953         while (lowerit(*ap) == lowerit(*bp++))
1954                 if (*ap++ == '\0')
1955                         return TRUE;
1956         return FALSE;
1957 }
1958
1959 static int
1960 itsabbr(abbr, word)
1961 register const char *   abbr;
1962 register const char *   word;
1963 {
1964         if (lowerit(*abbr) != lowerit(*word))
1965                 return FALSE;
1966         ++word;
1967         while (*++abbr != '\0')
1968                 do {
1969                         if (*word == '\0')
1970                                 return FALSE;
1971                 } while (lowerit(*word++) != lowerit(*abbr));
1972         return TRUE;
1973 }
1974
1975 static const struct lookup *
1976 byword(word, table)
1977 register const char * const             word;
1978 register const struct lookup * const    table;
1979 {
1980         register const struct lookup *  foundlp;
1981         register const struct lookup *  lp;
1982
1983         if (word == NULL || table == NULL)
1984                 return NULL;
1985         /*
1986         ** Look for exact match.
1987         */
1988         for (lp = table; lp->l_word != NULL; ++lp)
1989                 if (ciequal(word, lp->l_word))
1990                         return lp;
1991         /*
1992         ** Look for inexact match.
1993         */
1994         foundlp = NULL;
1995         for (lp = table; lp->l_word != NULL; ++lp)
1996                 if (itsabbr(word, lp->l_word)) {
1997                         if (foundlp == NULL)
1998                                 foundlp = lp;
1999                         else    return NULL;    /* multiple inexact matches */
2000                 }
2001         return foundlp;
2002 }
2003
2004 static char **
2005 getfields(cp)
2006 register char * cp;
2007 {
2008         register char *         dp;
2009         register char **        array;
2010         register int            nsubs;
2011
2012         if (cp == NULL)
2013                 return NULL;
2014         array = (char **) (void *)
2015                 emalloc((int) ((strlen(cp) + 1) * sizeof *array));
2016         nsubs = 0;
2017         for ( ; ; ) {
2018                 while (isascii(*cp) && isspace((unsigned char) *cp))
2019                         ++cp;
2020                 if (*cp == '\0' || *cp == '#')
2021                         break;
2022                 array[nsubs++] = dp = cp;
2023                 do {
2024                         if ((*dp = *cp++) != '"')
2025                                 ++dp;
2026                         else while ((*dp = *cp++) != '"')
2027                                 if (*dp != '\0')
2028                                         ++dp;
2029                                 else    error(_("Odd number of quotation marks"));
2030                 } while (*cp != '\0' && *cp != '#' &&
2031                         (!isascii(*cp) || !isspace((unsigned char) *cp)));
2032                 if (isascii(*cp) && isspace((unsigned char) *cp))
2033                         ++cp;
2034                 *dp = '\0';
2035         }
2036         array[nsubs] = NULL;
2037         return array;
2038 }
2039
2040 static long
2041 oadd(t1, t2)
2042 const long      t1;
2043 const long      t2;
2044 {
2045         register long   t;
2046
2047         t = t1 + t2;
2048         if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {
2049                 error(_("time overflow"));
2050                 (void) exit(EXIT_FAILURE);
2051         }
2052         return t;
2053 }
2054
2055 static time_t
2056 tadd(t1, t2)
2057 const time_t    t1;
2058 const long      t2;
2059 {
2060         register time_t t;
2061
2062         if (t1 == max_time && t2 > 0)
2063                 return max_time;
2064         if (t1 == min_time && t2 < 0)
2065                 return min_time;
2066         t = t1 + t2;
2067         if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {
2068                 error(_("time overflow"));
2069                 (void) exit(EXIT_FAILURE);
2070         }
2071         return t;
2072 }
2073
2074 /*
2075 ** Given a rule, and a year, compute the date - in seconds since January 1,
2076 ** 1970, 00:00 LOCAL time - in that year that the rule refers to.
2077 */
2078
2079 static time_t
2080 rpytime(rp, wantedy)
2081 register const struct rule * const      rp;
2082 register const int                      wantedy;
2083 {
2084         register int    y, m, i;
2085         register long   dayoff;                 /* with a nod to Margaret O. */
2086         register time_t t;
2087
2088         if (wantedy == INT_MIN)
2089                 return min_time;
2090         if (wantedy == INT_MAX)
2091                 return max_time;
2092         dayoff = 0;
2093         m = TM_JANUARY;
2094         y = EPOCH_YEAR;
2095         while (wantedy != y) {
2096                 if (wantedy > y) {
2097                         i = len_years[isleap(y)];
2098                         ++y;
2099                 } else {
2100                         --y;
2101                         i = -len_years[isleap(y)];
2102                 }
2103                 dayoff = oadd(dayoff, eitol(i));
2104         }
2105         while (m != rp->r_month) {
2106                 i = len_months[isleap(y)][m];
2107                 dayoff = oadd(dayoff, eitol(i));
2108                 ++m;
2109         }
2110         i = rp->r_dayofmonth;
2111         if (m == TM_FEBRUARY && i == 29 && !isleap(y)) {
2112                 if (rp->r_dycode == DC_DOWLEQ)
2113                         --i;
2114                 else {
2115                         error(_("use of 2/29 in non leap-year"));
2116                         (void) exit(EXIT_FAILURE);
2117                 }
2118         }
2119         --i;
2120         dayoff = oadd(dayoff, eitol(i));
2121         if (rp->r_dycode == DC_DOWGEQ || rp->r_dycode == DC_DOWLEQ) {
2122                 register long   wday;
2123
2124 #define LDAYSPERWEEK    ((long) DAYSPERWEEK)
2125                 wday = eitol(EPOCH_WDAY);
2126                 /*
2127                 ** Don't trust mod of negative numbers.
2128                 */
2129                 if (dayoff >= 0)
2130                         wday = (wday + dayoff) % LDAYSPERWEEK;
2131                 else {
2132                         wday -= ((-dayoff) % LDAYSPERWEEK);
2133                         if (wday < 0)
2134                                 wday += LDAYSPERWEEK;
2135                 }
2136                 while (wday != eitol(rp->r_wday))
2137                         if (rp->r_dycode == DC_DOWGEQ) {
2138                                 dayoff = oadd(dayoff, (long) 1);
2139                                 if (++wday >= LDAYSPERWEEK)
2140                                         wday = 0;
2141                                 ++i;
2142                         } else {
2143                                 dayoff = oadd(dayoff, (long) -1);
2144                                 if (--wday < 0)
2145                                         wday = LDAYSPERWEEK - 1;
2146                                 --i;
2147                         }
2148                 if (i < 0 || i >= len_months[isleap(y)][m]) {
2149                         error(_("no day in month matches rule"));
2150                         (void) exit(EXIT_FAILURE);
2151                 }
2152         }
2153         if (dayoff < 0 && !TYPE_SIGNED(time_t))
2154                 return min_time;
2155         t = (time_t) dayoff * SECSPERDAY;
2156         /*
2157         ** Cheap overflow check.
2158         */
2159         if (t / SECSPERDAY != dayoff)
2160                 return (dayoff > 0) ? max_time : min_time;
2161         return tadd(t, rp->r_tod);
2162 }
2163
2164 static void
2165 newabbr(string)
2166 const char * const      string;
2167 {
2168         register int    i;
2169
2170         i = strlen(string) + 1;
2171         if (charcnt + i > TZ_MAX_CHARS) {
2172                 error(_("too many, or too long, time zone abbreviations"));
2173                 (void) exit(EXIT_FAILURE);
2174         }
2175         (void) strcpy(&chars[charcnt], string);
2176         charcnt += eitol(i);
2177 }
2178
2179 static int
2180 mkdirs(argname)
2181 char * const    argname;
2182 {
2183         register char * name;
2184         register char * cp;
2185
2186         if (argname == NULL || *argname == '\0')
2187                 return 0;
2188         cp = name = ecpyalloc(argname);
2189         while ((cp = strchr(cp + 1, '/')) != 0) {
2190                 *cp = '\0';
2191 #ifndef unix
2192                 /*
2193                 ** DOS drive specifier?
2194                 */
2195                 if (isalpha((unsigned char) name[0]) &&
2196                         name[1] == ':' && name[2] == '\0') {
2197                                 *cp = '/';
2198                                 continue;
2199                 }
2200 #endif /* !defined unix */
2201                 if (!itsdir(name)) {
2202                         /*
2203                         ** It doesn't seem to exist, so we try to create it.
2204                         ** Creation may fail because of the directory being
2205                         ** created by some other multiprocessor, so we get
2206                         ** to do extra checking.
2207                         */
2208                         if (mkdir(name, MKDIR_UMASK) != 0) {
2209                                 const char *e = strerror(errno);
2210
2211                                 if (errno != EEXIST || !itsdir(name)) {
2212                                         (void) fprintf(stderr,
2213 _("%s: Can't create directory %s: %s\n"),
2214                                                 progname, name, e);
2215                                         ifree(name);
2216                                         return -1;
2217                                 }
2218                         }
2219                 }
2220                 *cp = '/';
2221         }
2222         ifree(name);
2223         return 0;
2224 }
2225
2226 static long
2227 eitol(i)
2228 const int       i;
2229 {
2230         long    l;
2231
2232         l = i;
2233         if ((i < 0 && l >= 0) || (i == 0 && l != 0) || (i > 0 && l <= 0)) {
2234                 (void) fprintf(stderr,
2235                         _("%s: %d did not sign extend correctly\n"),
2236                         progname, i);
2237                 (void) exit(EXIT_FAILURE);
2238         }
2239         return l;
2240 }
2241
2242 /*
2243 ** UNIX was a registered trademark of UNIX System Laboratories in 1993.
2244 */