Zoneinfo data and programs.
[kopensolaris-gnu/glibc.git] / timezone / zic.c
1 #ifndef lint
2 #ifndef NOID
3 static char     elsieid[] = "@(#)zic.c  7.93";
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 /*
15 ** On some ancient hosts, predicates like `isspace(C)' are defined
16 ** only if isascii(C) || C == EOF.  Modern hosts obey the C Standard,
17 ** which says they are defined only if C == ((unsigned char) C) || C == EOF.
18 ** Neither the C Standard nor Posix require that `isascii' exist.
19 ** For portability, we check both ancient and modern requirements.
20 ** If isascii is not defined, the isascii check succeeds trivially.
21 */
22 #include "ctype.h"
23 #ifndef isascii
24 #define isascii(x) 1
25 #endif
26
27 struct rule {
28         const char *    r_filename;
29         int             r_linenum;
30         const char *    r_name;
31
32         int             r_loyear;       /* for example, 1986 */
33         int             r_hiyear;       /* for example, 1986 */
34         const char *    r_yrtype;
35
36         int             r_month;        /* 0..11 */
37
38         int             r_dycode;       /* see below */
39         int             r_dayofmonth;
40         int             r_wday;
41
42         long            r_tod;          /* time from midnight */
43         int             r_todisstd;     /* above is standard time if TRUE */
44                                         /* or wall clock time if FALSE */
45         int             r_todisgmt;     /* above is GMT if TRUE */
46                                         /* or local time if FALSE */
47         long            r_stdoff;       /* offset from standard time */
48         const char *    r_abbrvar;      /* variable part of abbreviation */
49
50         int             r_todo;         /* a rule to do (used in outzone) */
51         time_t          r_temp;         /* used in outzone */
52 };
53
54 /*
55 **      r_dycode                r_dayofmonth    r_wday
56 */
57
58 #define DC_DOM          0       /* 1..31 */     /* unused */
59 #define DC_DOWGEQ       1       /* 1..31 */     /* 0..6 (Sun..Sat) */
60 #define DC_DOWLEQ       2       /* 1..31 */     /* 0..6 (Sun..Sat) */
61
62 struct zone {
63         const char *    z_filename;
64         int             z_linenum;
65
66         const char *    z_name;
67         long            z_gmtoff;
68         const char *    z_rule;
69         const char *    z_format;
70
71         long            z_stdoff;
72
73         struct rule *   z_rules;
74         int             z_nrules;
75
76         struct rule     z_untilrule;
77         time_t          z_untiltime;
78 };
79
80 extern int      getopt P((int argc, char * const argv[],
81                         const char * options));
82 extern int      link P((const char * fromname, const char * toname));
83 extern char *   optarg;
84 extern int      optind;
85
86 static void     addtt P((time_t starttime, int type));
87 static int      addtype P((long gmtoff, const char * abbr, int isdst,
88                                 int ttisstd, int ttisgmt));
89 static void     leapadd P((time_t t, int positive, int rolling, int count));
90 static void     adjleap P((void));
91 static void     associate P((void));
92 static int      ciequal P((const char * ap, const char * bp));
93 static void     convert P((long val, char * buf));
94 static void     dolink P((const char * fromfile, const char * tofile));
95 static void     doabbr P((char * abbr, const char * format,
96                         const char * letters, int isdst));
97 static void     eat P((const char * name, int num));
98 static void     eats P((const char * name, int num,
99                         const char * rname, int rnum));
100 static long     eitol P((int i));
101 static void     error P((const char * message));
102 static char **  getfields P((char * buf));
103 static long     gethms P((const char * string, const char * errstrng,
104                         int signable));
105 static void     infile P((const char * filename));
106 static void     inleap P((char ** fields, int nfields));
107 static void     inlink P((char ** fields, int nfields));
108 static void     inrule P((char ** fields, int nfields));
109 static int      inzcont P((char ** fields, int nfields));
110 static int      inzone P((char ** fields, int nfields));
111 static int      inzsub P((char ** fields, int nfields, int iscont));
112 static int      itsabbr P((const char * abbr, const char * word));
113 static int      itsdir P((const char * name));
114 static int      lowerit P((int c));
115 static char *   memcheck P((char * tocheck));
116 static int      mkdirs P((char * filename));
117 static void     newabbr P((const char * abbr));
118 static long     oadd P((long t1, long t2));
119 static void     outzone P((const struct zone * zp, int ntzones));
120 static void     puttzcode P((long code, FILE * fp));
121 static int      rcomp P((const void * leftp, const void * rightp));
122 static time_t   rpytime P((const struct rule * rp, int wantedy));
123 static void     rulesub P((struct rule * rp,
124                         const char * loyearp, const char * hiyearp,
125                         const char * typep, const char * monthp,
126                         const char * dayp, const char * timep));
127 static void     setboundaries P((void));
128 static time_t   tadd P((time_t t1, long t2));
129 static void     usage P((void));
130 static void     writezone P((const char * name));
131 static int      yearistype P((int year, const char * type));
132
133 #if !(HAVE_STRERROR - 0)
134 static char *   strerror P((int));
135 #endif /* !(HAVE_STRERROR - 0) */
136
137 static int              charcnt;
138 static int              errors;
139 static const char *     filename;
140 static int              leapcnt;
141 static int              linenum;
142 static time_t           max_time;
143 static int              max_year;
144 static int              max_year_representable;
145 static time_t           min_time;
146 static int              min_year;
147 static int              min_year_representable;
148 static int              noise;
149 static const char *     rfilename;
150 static int              rlinenum;
151 static const char *     progname;
152 static int              timecnt;
153 static int              typecnt;
154
155 /*
156 ** Line codes.
157 */
158
159 #define LC_RULE         0
160 #define LC_ZONE         1
161 #define LC_LINK         2
162 #define LC_LEAP         3
163
164 /*
165 ** Which fields are which on a Zone line.
166 */
167
168 #define ZF_NAME         1
169 #define ZF_GMTOFF       2
170 #define ZF_RULE         3
171 #define ZF_FORMAT       4
172 #define ZF_TILYEAR      5
173 #define ZF_TILMONTH     6
174 #define ZF_TILDAY       7
175 #define ZF_TILTIME      8
176 #define ZONE_MINFIELDS  5
177 #define ZONE_MAXFIELDS  9
178
179 /*
180 ** Which fields are which on a Zone continuation line.
181 */
182
183 #define ZFC_GMTOFF      0
184 #define ZFC_RULE        1
185 #define ZFC_FORMAT      2
186 #define ZFC_TILYEAR     3
187 #define ZFC_TILMONTH    4
188 #define ZFC_TILDAY      5
189 #define ZFC_TILTIME     6
190 #define ZONEC_MINFIELDS 3
191 #define ZONEC_MAXFIELDS 7
192
193 /*
194 ** Which files are which on a Rule line.
195 */
196
197 #define RF_NAME         1
198 #define RF_LOYEAR       2
199 #define RF_HIYEAR       3
200 #define RF_COMMAND      4
201 #define RF_MONTH        5
202 #define RF_DAY          6
203 #define RF_TOD          7
204 #define RF_STDOFF       8
205 #define RF_ABBRVAR      9
206 #define RULE_FIELDS     10
207
208 /*
209 ** Which fields are which on a Link line.
210 */
211
212 #define LF_FROM         1
213 #define LF_TO           2
214 #define LINK_FIELDS     3
215
216 /*
217 ** Which fields are which on a Leap line.
218 */
219
220 #define LP_YEAR         1
221 #define LP_MONTH        2
222 #define LP_DAY          3
223 #define LP_TIME         4
224 #define LP_CORR         5
225 #define LP_ROLL         6
226 #define LEAP_FIELDS     7
227
228 /*
229 ** Year synonyms.
230 */
231
232 #define YR_MINIMUM      0
233 #define YR_MAXIMUM      1
234 #define YR_ONLY         2
235
236 static struct rule *    rules;
237 static int              nrules; /* number of rules */
238
239 static struct zone *    zones;
240 static int              nzones; /* number of zones */
241
242 struct link {
243         const char *    l_filename;
244         int             l_linenum;
245         const char *    l_from;
246         const char *    l_to;
247 };
248
249 static struct link *    links;
250 static int              nlinks;
251
252 struct lookup {
253         const char *    l_word;
254         const int       l_value;
255 };
256
257 static struct lookup const *    byword P((const char * string,
258                                         const struct lookup * lp));
259
260 static struct lookup const      line_codes[] = {
261         { "Rule",       LC_RULE },
262         { "Zone",       LC_ZONE },
263         { "Link",       LC_LINK },
264         { "Leap",       LC_LEAP },
265         { NULL,         0}
266 };
267
268 static struct lookup const      mon_names[] = {
269         { "January",    TM_JANUARY },
270         { "February",   TM_FEBRUARY },
271         { "March",      TM_MARCH },
272         { "April",      TM_APRIL },
273         { "May",        TM_MAY },
274         { "June",       TM_JUNE },
275         { "July",       TM_JULY },
276         { "August",     TM_AUGUST },
277         { "September",  TM_SEPTEMBER },
278         { "October",    TM_OCTOBER },
279         { "November",   TM_NOVEMBER },
280         { "December",   TM_DECEMBER },
281         { NULL,         0 }
282 };
283
284 static struct lookup const      wday_names[] = {
285         { "Sunday",     TM_SUNDAY },
286         { "Monday",     TM_MONDAY },
287         { "Tuesday",    TM_TUESDAY },
288         { "Wednesday",  TM_WEDNESDAY },
289         { "Thursday",   TM_THURSDAY },
290         { "Friday",     TM_FRIDAY },
291         { "Saturday",   TM_SATURDAY },
292         { NULL,         0 }
293 };
294
295 static struct lookup const      lasts[] = {
296         { "last-Sunday",        TM_SUNDAY },
297         { "last-Monday",        TM_MONDAY },
298         { "last-Tuesday",       TM_TUESDAY },
299         { "last-Wednesday",     TM_WEDNESDAY },
300         { "last-Thursday",      TM_THURSDAY },
301         { "last-Friday",        TM_FRIDAY },
302         { "last-Saturday",      TM_SATURDAY },
303         { NULL,                 0 }
304 };
305
306 static struct lookup const      begin_years[] = {
307         { "minimum",    YR_MINIMUM },
308         { "maximum",    YR_MAXIMUM },
309         { NULL,         0 }
310 };
311
312 static struct lookup const      end_years[] = {
313         { "minimum",    YR_MINIMUM },
314         { "maximum",    YR_MAXIMUM },
315         { "only",       YR_ONLY },
316         { NULL,         0 }
317 };
318
319 static struct lookup const      leap_types[] = {
320         { "Rolling",    TRUE },
321         { "Stationary", FALSE },
322         { NULL,         0 }
323 };
324
325 static const int        len_months[2][MONSPERYEAR] = {
326         { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
327         { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
328 };
329
330 static const int        len_years[2] = {
331         DAYSPERNYEAR, DAYSPERLYEAR
332 };
333
334 static struct attype {
335         time_t          at;
336         unsigned char   type;
337 }                       attypes[TZ_MAX_TIMES];
338 static long             gmtoffs[TZ_MAX_TYPES];
339 static char             isdsts[TZ_MAX_TYPES];
340 static unsigned char    abbrinds[TZ_MAX_TYPES];
341 static char             ttisstds[TZ_MAX_TYPES];
342 static char             ttisgmts[TZ_MAX_TYPES];
343 static char             chars[TZ_MAX_CHARS];
344 static time_t           trans[TZ_MAX_LEAPS];
345 static long             corr[TZ_MAX_LEAPS];
346 static char             roll[TZ_MAX_LEAPS];
347
348 /*
349 ** Memory allocation.
350 */
351
352 static char *
353 memcheck(ptr)
354 char * const    ptr;
355 {
356         if (ptr == NULL) {
357                 const char *e = strerror(errno);
358
359                 (void) fprintf(stderr, _("%s: Memory exhausted: %s\n"),
360                         progname, e);
361                 (void) exit(EXIT_FAILURE);
362         }
363         return ptr;
364 }
365
366 #define emalloc(size)           memcheck(imalloc(size))
367 #define erealloc(ptr, size)     memcheck(irealloc((ptr), (size)))
368 #define ecpyalloc(ptr)          memcheck(icpyalloc(ptr))
369 #define ecatalloc(oldp, newp)   memcheck(icatalloc((oldp), (newp)))
370
371 /*
372 ** Error handling.
373 */
374
375 #if !(HAVE_STRERROR - 0)
376 static char *
377 strerror(errnum)
378 int     errnum;
379 {
380         extern char *   sys_errlist[];
381         extern int      sys_nerr;
382
383         return (errnum > 0 && errnum <= sys_nerr) ?
384                 sys_errlist[errnum] : "Unknown system error";
385 }
386 #endif /* !(HAVE_STRERROR - 0) */
387
388 static void
389 eats(name, num, rname, rnum)
390 const char * const      name;
391 const int               num;
392 const char * const      rname;
393 const int               rnum;
394 {
395         filename = name;
396         linenum = num;
397         rfilename = rname;
398         rlinenum = rnum;
399 }
400
401 static void
402 eat(name, num)
403 const char * const      name;
404 const int               num;
405 {
406         eats(name, num, (char *) NULL, -1);
407 }
408
409 static void
410 error(string)
411 const char * const      string;
412 {
413         /*
414         ** Match the format of "cc" to allow sh users to
415         **      zic ... 2>&1 | error -t "*" -v
416         ** on BSD systems.
417         */
418         (void) fprintf(stderr, _("\"%s\", line %d: %s"),
419                 filename, linenum, string);
420         if (rfilename != NULL)
421                 (void) fprintf(stderr, _(" (rule from \"%s\", line %d)"),
422                         rfilename, rlinenum);
423         (void) fprintf(stderr, "\n");
424         ++errors;
425 }
426
427 static void
428 warning(string)
429 const char * const      string;
430 {
431         char *  cp;
432
433         cp = ecpyalloc("warning: ");
434         cp = ecatalloc(cp, string);
435         error(cp);
436         ifree(cp);
437         --errors;
438 }
439
440 static void
441 usage P((void))
442 {
443         (void) fprintf(stderr, _("%s: usage is %s [ -s ] [ -v ] [ -l localtime ] [ -p posixrules ] [ -d directory ]\n\t[ -L leapseconds ] [ -y yearistype ] [ filename ... ]\n"),
444                 progname, progname);
445         (void) exit(EXIT_FAILURE);
446 }
447
448 static const char *     psxrules;
449 static const char *     lcltime;
450 static const char *     directory;
451 static const char *     leapsec;
452 static const char *     yitcommand;
453 static int              sflag = FALSE;
454
455 int
456 main(argc, argv)
457 int     argc;
458 char *  argv[];
459 {
460         register int    i;
461         register int    j;
462         register int    c;
463
464 #ifdef unix
465         (void) umask(umask(S_IWGRP | S_IWOTH) | (S_IWGRP | S_IWOTH));
466 #endif /* defined unix */
467 #if HAVE_GETTEXT - 0
468         (void) setlocale(LC_MESSAGES, "");
469 #ifdef TZ_DOMAINDIR
470         (void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR);
471 #endif /* defined TEXTDOMAINDIR */
472         (void) textdomain(TZ_DOMAIN);
473 #endif /* HAVE_GETTEXT - 0 */
474         progname = argv[0];
475         while ((c = getopt(argc, argv, "d:l:p:L:vsy:")) != EOF && c != -1)
476                 switch (c) {
477                         default:
478                                 usage();
479                         case 'd':
480                                 if (directory == NULL)
481                                         directory = optarg;
482                                 else {
483                                         (void) fprintf(stderr,
484 _("%s: More than one -d option specified\n"),
485                                                 progname);
486                                         (void) exit(EXIT_FAILURE);
487                                 }
488                                 break;
489                         case 'l':
490                                 if (lcltime == NULL)
491                                         lcltime = optarg;
492                                 else {
493                                         (void) fprintf(stderr,
494 _("%s: More than one -l option specified\n"),
495                                                 progname);
496                                         (void) exit(EXIT_FAILURE);
497                                 }
498                                 break;
499                         case 'p':
500                                 if (psxrules == NULL)
501                                         psxrules = optarg;
502                                 else {
503                                         (void) fprintf(stderr,
504 _("%s: More than one -p option specified\n"),
505                                                 progname);
506                                         (void) exit(EXIT_FAILURE);
507                                 }
508                                 break;
509                         case 'y':
510                                 if (yitcommand == NULL)
511                                         yitcommand = optarg;
512                                 else {
513                                         (void) fprintf(stderr,
514 _("%s: More than one -y option specified\n"),
515                                                 progname);
516                                         (void) exit(EXIT_FAILURE);
517                                 }
518                                 break;
519                         case 'L':
520                                 if (leapsec == NULL)
521                                         leapsec = optarg;
522                                 else {
523                                         (void) fprintf(stderr,
524 _("%s: More than one -L option specified\n"),
525                                                 progname);
526                                         (void) exit(EXIT_FAILURE);
527                                 }
528                                 break;
529                         case 'v':
530                                 noise = TRUE;
531                                 break;
532                         case 's':
533                                 sflag = TRUE;
534                                 break;
535                 }
536         if (optind == argc - 1 && strcmp(argv[optind], "=") == 0)
537                 usage();        /* usage message by request */
538         if (directory == NULL)
539                 directory = TZDIR;
540         if (yitcommand == NULL)
541                 yitcommand = "yearistype";
542
543         setboundaries();
544
545         if (optind < argc && leapsec != NULL) {
546                 infile(leapsec);
547                 adjleap();
548         }
549
550         for (i = optind; i < argc; ++i)
551                 infile(argv[i]);
552         if (errors)
553                 (void) exit(EXIT_FAILURE);
554         associate();
555         for (i = 0; i < nzones; i = j) {
556                 /*
557                 ** Find the next non-continuation zone entry.
558                 */
559                 for (j = i + 1; j < nzones && zones[j].z_name == NULL; ++j)
560                         continue;
561                 outzone(&zones[i], j - i);
562         }
563         /*
564         ** Make links.
565         */
566         for (i = 0; i < nlinks; ++i)
567                 dolink(links[i].l_from, links[i].l_to);
568         if (lcltime != NULL)
569                 dolink(lcltime, TZDEFAULT);
570         if (psxrules != NULL)
571                 dolink(psxrules, TZDEFRULES);
572         return (errors == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
573 }
574
575 static void
576 dolink(fromfile, tofile)
577 const char * const      fromfile;
578 const char * const      tofile;
579 {
580         register char * fromname;
581         register char * toname;
582
583         if (fromfile[0] == '/')
584                 fromname = ecpyalloc(fromfile);
585         else {
586                 fromname = ecpyalloc(directory);
587                 fromname = ecatalloc(fromname, "/");
588                 fromname = ecatalloc(fromname, fromfile);
589         }
590         if (tofile[0] == '/')
591                 toname = ecpyalloc(tofile);
592         else {
593                 toname = ecpyalloc(directory);
594                 toname = ecatalloc(toname, "/");
595                 toname = ecatalloc(toname, tofile);
596         }
597         /*
598         ** We get to be careful here since
599         ** there's a fair chance of root running us.
600         */
601         if (!itsdir(toname))
602                 (void) remove(toname);
603         if (link(fromname, toname) != 0) {
604                 int failure = errno;
605                 if (failure == ENOENT)
606                         if (mkdirs(toname) != 0)
607                                 failure = errno;
608                         else if (link(fromname, toname) == 0)
609                                 failure = 0;
610                         else
611                                 failure = errno;
612 #ifndef MISSING_SYMLINK
613                 if (failure == EXDEV)
614                         if (symlink(fromname, toname) != 0)
615                                 failure = errno;
616                         else
617                                 failure = 0;
618 #endif
619                 if (failure) {
620                         const char *e = strerror(failure);
621
622                         (void) fprintf(stderr,
623                                 _("%s: Can't link from %s to %s: %s\n"),
624                                 progname, fromname, toname, e);
625                         (void) exit(EXIT_FAILURE);
626                 }
627         }
628         ifree(fromname);
629         ifree(toname);
630 }
631
632 #ifndef INT_MAX
633 #define INT_MAX ((int) (((unsigned)~0)>>1))
634 #endif /* !defined INT_MAX */
635
636 #ifndef INT_MIN
637 #define INT_MIN ((int) ~(((unsigned)~0)>>1))
638 #endif /* !defined INT_MIN */
639
640 /*
641 ** The tz file format currently allows at most 32-bit quantities.
642 ** This restriction should be removed before signed 32-bit values
643 ** wrap around in 2038, but unfortunately this will require a
644 ** change to the tz file format.
645 */
646
647 #define MAX_BITS_IN_FILE        32
648 #define TIME_T_BITS_IN_FILE     ((TYPE_BIT(time_t) < MAX_BITS_IN_FILE) ? TYPE_BIT(time_t) : MAX_BITS_IN_FILE)
649
650 static void
651 setboundaries P((void))
652 {
653         if (TYPE_SIGNED(time_t)) {
654                 min_time = ~ (time_t) 0;
655                 min_time <<= TIME_T_BITS_IN_FILE - 1;
656                 max_time = ~ (time_t) 0 - min_time;
657                 if (sflag)
658                         min_time = 0;
659         } else {
660                 min_time = 0;
661                 max_time = 2 - sflag;
662                 max_time <<= TIME_T_BITS_IN_FILE - 1;
663                 --max_time;
664         }
665         min_year = TM_YEAR_BASE + gmtime(&min_time)->tm_year;
666         max_year = TM_YEAR_BASE + gmtime(&max_time)->tm_year;
667         min_year_representable = min_year;
668         max_year_representable = max_year;
669 }
670
671 static int
672 itsdir(name)
673 const char * const      name;
674 {
675         register char * myname;
676         register int    accres;
677
678         myname = ecpyalloc(name);
679         myname = ecatalloc(myname, "/.");
680         accres = access(myname, F_OK);
681         ifree(myname);
682         return accres == 0;
683 }
684
685 /*
686 ** Associate sets of rules with zones.
687 */
688
689 /*
690 ** Sort by rule name.
691 */
692
693 static int
694 rcomp(cp1, cp2)
695 const void *    cp1;
696 const void *    cp2;
697 {
698         return strcmp(((const struct rule *) cp1)->r_name,
699                 ((const struct rule *) cp2)->r_name);
700 }
701
702 static void
703 associate P((void))
704 {
705         register struct zone *  zp;
706         register struct rule *  rp;
707         register int            base, out;
708         register int            i, j;
709
710         if (nrules != 0) {
711                 (void) qsort((void *) rules, (size_t) nrules,
712                         (size_t) sizeof *rules, rcomp);
713                 for (i = 0; i < nrules - 1; ++i) {
714                         if (strcmp(rules[i].r_name,
715                                 rules[i + 1].r_name) != 0)
716                                         continue;
717                         if (strcmp(rules[i].r_filename,
718                                 rules[i + 1].r_filename) == 0)
719                                         continue;
720                         eat(rules[i].r_filename, rules[i].r_linenum);
721                         warning(_("same rule name in multiple files"));
722                         eat(rules[i + 1].r_filename, rules[i + 1].r_linenum);
723                         warning(_("same rule name in multiple files"));
724                         for (j = i + 2; j < nrules; ++j) {
725                                 if (strcmp(rules[i].r_name,
726                                         rules[j].r_name) != 0)
727                                                 break;
728                                 if (strcmp(rules[i].r_filename,
729                                         rules[j].r_filename) == 0)
730                                                 continue;
731                                 if (strcmp(rules[i + 1].r_filename,
732                                         rules[j].r_filename) == 0)
733                                                 continue;
734                                 break;
735                         }
736                         i = j - 1;
737                 }
738         }
739         for (i = 0; i < nzones; ++i) {
740                 zp = &zones[i];
741                 zp->z_rules = NULL;
742                 zp->z_nrules = 0;
743         }
744         for (base = 0; base < nrules; base = out) {
745                 rp = &rules[base];
746                 for (out = base + 1; out < nrules; ++out)
747                         if (strcmp(rp->r_name, rules[out].r_name) != 0)
748                                 break;
749                 for (i = 0; i < nzones; ++i) {
750                         zp = &zones[i];
751                         if (strcmp(zp->z_rule, rp->r_name) != 0)
752                                 continue;
753                         zp->z_rules = rp;
754                         zp->z_nrules = out - base;
755                 }
756         }
757         for (i = 0; i < nzones; ++i) {
758                 zp = &zones[i];
759                 if (zp->z_nrules == 0) {
760                         /*
761                         ** Maybe we have a local standard time offset.
762                         */
763                         eat(zp->z_filename, zp->z_linenum);
764                         zp->z_stdoff = gethms(zp->z_rule, _("unruly zone"),
765                                               TRUE);
766                         /*
767                         ** Note, though, that if there's no rule,
768                         ** a '%s' in the format is a bad thing.
769                         */
770                         if (strchr(zp->z_format, '%') != 0)
771                                 error(_("%s in ruleless zone"));
772                 }
773         }
774         if (errors)
775                 (void) exit(EXIT_FAILURE);
776 }
777
778 static void
779 infile(name)
780 const char *    name;
781 {
782         register FILE *                 fp;
783         register char **                fields;
784         register char *                 cp;
785         register const struct lookup *  lp;
786         register int                    nfields;
787         register int                    wantcont;
788         register int                    num;
789         char                            buf[BUFSIZ];
790
791         if (strcmp(name, "-") == 0) {
792                 name = _("standard input");
793                 fp = stdin;
794         } else if ((fp = fopen(name, "r")) == NULL) {
795                 const char *e = strerror(errno);
796
797                 (void) fprintf(stderr, _("%s: Can't open %s: %s\n"),
798                         progname, name, e);
799                 (void) exit(EXIT_FAILURE);
800         }
801         wantcont = FALSE;
802         for (num = 1; ; ++num) {
803                 eat(name, num);
804                 if (fgets(buf, (int) sizeof buf, fp) != buf)
805                         break;
806                 cp = strchr(buf, '\n');
807                 if (cp == NULL) {
808                         error(_("line too long"));
809                         (void) exit(EXIT_FAILURE);
810                 }
811                 *cp = '\0';
812                 fields = getfields(buf);
813                 nfields = 0;
814                 while (fields[nfields] != NULL) {
815                         static char     nada;
816
817                         if (strcmp(fields[nfields], "-") == 0)
818                                 fields[nfields] = &nada;
819                         ++nfields;
820                 }
821                 if (nfields == 0) {
822                         /* nothing to do */
823                 } else if (wantcont) {
824                         wantcont = inzcont(fields, nfields);
825                 } else {
826                         lp = byword(fields[0], line_codes);
827                         if (lp == NULL)
828                                 error(_("input line of unknown type"));
829                         else switch ((int) (lp->l_value)) {
830                                 case LC_RULE:
831                                         inrule(fields, nfields);
832                                         wantcont = FALSE;
833                                         break;
834                                 case LC_ZONE:
835                                         wantcont = inzone(fields, nfields);
836                                         break;
837                                 case LC_LINK:
838                                         inlink(fields, nfields);
839                                         wantcont = FALSE;
840                                         break;
841                                 case LC_LEAP:
842                                         if (name != leapsec)
843                                                 (void) fprintf(stderr,
844 _("%s: Leap line in non leap seconds file %s\n"),
845                                                         progname, name);
846                                         else    inleap(fields, nfields);
847                                         wantcont = FALSE;
848                                         break;
849                                 default:        /* "cannot happen" */
850                                         (void) fprintf(stderr,
851 _("%s: panic: Invalid l_value %d\n"),
852                                                 progname, lp->l_value);
853                                         (void) exit(EXIT_FAILURE);
854                         }
855                 }
856                 ifree((char *) fields);
857         }
858         if (ferror(fp)) {
859                 (void) fprintf(stderr, _("%s: Error reading %s\n"),
860                         progname, filename);
861                 (void) exit(EXIT_FAILURE);
862         }
863         if (fp != stdin && fclose(fp)) {
864                 const char *e = strerror(errno);
865
866                 (void) fprintf(stderr, _("%s: Error closing %s: %s\n"),
867                         progname, filename, e);
868                 (void) exit(EXIT_FAILURE);
869         }
870         if (wantcont)
871                 error(_("expected continuation line not found"));
872 }
873
874 /*
875 ** Convert a string of one of the forms
876 **      h       -h      hh:mm   -hh:mm  hh:mm:ss        -hh:mm:ss
877 ** into a number of seconds.
878 ** A null string maps to zero.
879 ** Call error with errstring and return zero on errors.
880 */
881
882 static long
883 gethms(string, errstring, signable)
884 const char *            string;
885 const char * const      errstring;
886 const int               signable;
887 {
888         int     hh, mm, ss, sign;
889
890         if (string == NULL || *string == '\0')
891                 return 0;
892         if (!signable)
893                 sign = 1;
894         else if (*string == '-') {
895                 sign = -1;
896                 ++string;
897         } else  sign = 1;
898         if (sscanf(string, scheck(string, "%d"), &hh) == 1)
899                 mm = ss = 0;
900         else if (sscanf(string, scheck(string, "%d:%d"), &hh, &mm) == 2)
901                 ss = 0;
902         else if (sscanf(string, scheck(string, "%d:%d:%d"),
903                 &hh, &mm, &ss) != 3) {
904                         error(errstring);
905                         return 0;
906         }
907         if (hh < 0 || hh >= HOURSPERDAY ||
908                 mm < 0 || mm >= MINSPERHOUR ||
909                 ss < 0 || ss > SECSPERMIN) {
910                         error(errstring);
911                         return 0;
912         }
913         return eitol(sign) *
914                 (eitol(hh * MINSPERHOUR + mm) *
915                 eitol(SECSPERMIN) + eitol(ss));
916 }
917
918 static void
919 inrule(fields, nfields)
920 register char ** const  fields;
921 const int               nfields;
922 {
923         static struct rule      r;
924
925         if (nfields != RULE_FIELDS) {
926                 error(_("wrong number of fields on Rule line"));
927                 return;
928         }
929         if (*fields[RF_NAME] == '\0') {
930                 error(_("nameless rule"));
931                 return;
932         }
933         r.r_filename = filename;
934         r.r_linenum = linenum;
935         r.r_stdoff = gethms(fields[RF_STDOFF], _("invalid saved time"), TRUE);
936         rulesub(&r, fields[RF_LOYEAR], fields[RF_HIYEAR], fields[RF_COMMAND],
937                 fields[RF_MONTH], fields[RF_DAY], fields[RF_TOD]);
938         r.r_name = ecpyalloc(fields[RF_NAME]);
939         r.r_abbrvar = ecpyalloc(fields[RF_ABBRVAR]);
940         rules = (struct rule *) (void *) erealloc((char *) rules,
941                 (int) ((nrules + 1) * sizeof *rules));
942         rules[nrules++] = r;
943 }
944
945 static int
946 inzone(fields, nfields)
947 register char ** const  fields;
948 const int               nfields;
949 {
950         register int    i;
951         static char *   buf;
952
953         if (nfields < ZONE_MINFIELDS || nfields > ZONE_MAXFIELDS) {
954                 error(_("wrong number of fields on Zone line"));
955                 return FALSE;
956         }
957         if (strcmp(fields[ZF_NAME], TZDEFAULT) == 0 && lcltime != NULL) {
958                 buf = erealloc(buf, (int) (132 + strlen(TZDEFAULT)));
959                 (void) sprintf(buf,
960 _("\"Zone %s\" line and -l option are mutually exclusive"),
961                         TZDEFAULT);
962                 error(buf);
963                 return FALSE;
964         }
965         if (strcmp(fields[ZF_NAME], TZDEFRULES) == 0 && psxrules != NULL) {
966                 buf = erealloc(buf, (int) (132 + strlen(TZDEFRULES)));
967                 (void) sprintf(buf,
968 _("\"Zone %s\" line and -p option are mutually exclusive"),
969                         TZDEFRULES);
970                 error(buf);
971                 return FALSE;
972         }
973         for (i = 0; i < nzones; ++i)
974                 if (zones[i].z_name != NULL &&
975                         strcmp(zones[i].z_name, fields[ZF_NAME]) == 0) {
976                                 buf = erealloc(buf, (int) (132 +
977                                         strlen(fields[ZF_NAME]) +
978                                         strlen(zones[i].z_filename)));
979                                 (void) sprintf(buf,
980 _("duplicate zone name %s (file \"%s\", line %d)"),
981                                         fields[ZF_NAME],
982                                         zones[i].z_filename,
983                                         zones[i].z_linenum);
984                                 error(buf);
985                                 return FALSE;
986                 }
987         return inzsub(fields, nfields, FALSE);
988 }
989
990 static int
991 inzcont(fields, nfields)
992 register char ** const  fields;
993 const int               nfields;
994 {
995         if (nfields < ZONEC_MINFIELDS || nfields > ZONEC_MAXFIELDS) {
996                 error(_("wrong number of fields on Zone continuation line"));
997                 return FALSE;
998         }
999         return inzsub(fields, nfields, TRUE);
1000 }
1001
1002 static int
1003 inzsub(fields, nfields, iscont)
1004 register char ** const  fields;
1005 const int               nfields;
1006 const int               iscont;
1007 {
1008         register char *         cp;
1009         static struct zone      z;
1010         register int            i_gmtoff, i_rule, i_format;
1011         register int            i_untilyear, i_untilmonth;
1012         register int            i_untilday, i_untiltime;
1013         register int            hasuntil;
1014
1015         if (iscont) {
1016                 i_gmtoff = ZFC_GMTOFF;
1017                 i_rule = ZFC_RULE;
1018                 i_format = ZFC_FORMAT;
1019                 i_untilyear = ZFC_TILYEAR;
1020                 i_untilmonth = ZFC_TILMONTH;
1021                 i_untilday = ZFC_TILDAY;
1022                 i_untiltime = ZFC_TILTIME;
1023                 z.z_name = NULL;
1024         } else {
1025                 i_gmtoff = ZF_GMTOFF;
1026                 i_rule = ZF_RULE;
1027                 i_format = ZF_FORMAT;
1028                 i_untilyear = ZF_TILYEAR;
1029                 i_untilmonth = ZF_TILMONTH;
1030                 i_untilday = ZF_TILDAY;
1031                 i_untiltime = ZF_TILTIME;
1032                 z.z_name = ecpyalloc(fields[ZF_NAME]);
1033         }
1034         z.z_filename = filename;
1035         z.z_linenum = linenum;
1036         z.z_gmtoff = gethms(fields[i_gmtoff], _("invalid UTC offset"), TRUE);
1037         if ((cp = strchr(fields[i_format], '%')) != 0) {
1038                 if (*++cp != 's' || strchr(cp, '%') != 0) {
1039                         error(_("invalid abbreviation format"));
1040                         return FALSE;
1041                 }
1042         }
1043         z.z_rule = ecpyalloc(fields[i_rule]);
1044         z.z_format = ecpyalloc(fields[i_format]);
1045         hasuntil = nfields > i_untilyear;
1046         if (hasuntil) {
1047                 z.z_untilrule.r_filename = filename;
1048                 z.z_untilrule.r_linenum = linenum;
1049                 rulesub(&z.z_untilrule,
1050                         fields[i_untilyear],
1051                         "only",
1052                         "",
1053                         (nfields > i_untilmonth) ?
1054                         fields[i_untilmonth] : "Jan",
1055                         (nfields > i_untilday) ? fields[i_untilday] : "1",
1056                         (nfields > i_untiltime) ? fields[i_untiltime] : "0");
1057                 z.z_untiltime = rpytime(&z.z_untilrule,
1058                         z.z_untilrule.r_loyear);
1059                 if (iscont && nzones > 0 &&
1060                         z.z_untiltime > min_time &&
1061                         z.z_untiltime < max_time &&
1062                         zones[nzones - 1].z_untiltime > min_time &&
1063                         zones[nzones - 1].z_untiltime < max_time &&
1064                         zones[nzones - 1].z_untiltime >= z.z_untiltime) {
1065                                 error(_("Zone continuation line end time is not after end time of previous line"));
1066                                 return FALSE;
1067                 }
1068         }
1069         zones = (struct zone *) (void *) erealloc((char *) zones,
1070                 (int) ((nzones + 1) * sizeof *zones));
1071         zones[nzones++] = z;
1072         /*
1073         ** If there was an UNTIL field on this line,
1074         ** there's more information about the zone on the next line.
1075         */
1076         return hasuntil;
1077 }
1078
1079 static void
1080 inleap(fields, nfields)
1081 register char ** const  fields;
1082 const int               nfields;
1083 {
1084         register const char *           cp;
1085         register const struct lookup *  lp;
1086         register int                    i, j;
1087         int                             year, month, day;
1088         long                            dayoff, tod;
1089         time_t                          t;
1090
1091         if (nfields != LEAP_FIELDS) {
1092                 error(_("wrong number of fields on Leap line"));
1093                 return;
1094         }
1095         dayoff = 0;
1096         cp = fields[LP_YEAR];
1097         if (sscanf(cp, scheck(cp, "%d"), &year) != 1) {
1098                         /*
1099                          * Leapin' Lizards!
1100                          */
1101                         error(_("invalid leaping year"));
1102                         return;
1103         }
1104         j = EPOCH_YEAR;
1105         while (j != year) {
1106                 if (year > j) {
1107                         i = len_years[isleap(j)];
1108                         ++j;
1109                 } else {
1110                         --j;
1111                         i = -len_years[isleap(j)];
1112                 }
1113                 dayoff = oadd(dayoff, eitol(i));
1114         }
1115         if ((lp = byword(fields[LP_MONTH], mon_names)) == NULL) {
1116                 error(_("invalid month name"));
1117                 return;
1118         }
1119         month = lp->l_value;
1120         j = TM_JANUARY;
1121         while (j != month) {
1122                 i = len_months[isleap(year)][j];
1123                 dayoff = oadd(dayoff, eitol(i));
1124                 ++j;
1125         }
1126         cp = fields[LP_DAY];
1127         if (sscanf(cp, scheck(cp, "%d"), &day) != 1 ||
1128                 day <= 0 || day > len_months[isleap(year)][month]) {
1129                         error(_("invalid day of month"));
1130                         return;
1131         }
1132         dayoff = oadd(dayoff, eitol(day - 1));
1133         if (dayoff < 0 && !TYPE_SIGNED(time_t)) {
1134                 error(_("time before zero"));
1135                 return;
1136         }
1137         t = (time_t) dayoff * SECSPERDAY;
1138         /*
1139         ** Cheap overflow check.
1140         */
1141         if (t / SECSPERDAY != dayoff) {
1142                 error(_("time overflow"));
1143                 return;
1144         }
1145         tod = gethms(fields[LP_TIME], _("invalid time of day"), FALSE);
1146         cp = fields[LP_CORR];
1147         {
1148                 register int    positive;
1149                 int             count;
1150
1151                 if (strcmp(cp, "") == 0) { /* infile() turns "-" into "" */
1152                         positive = FALSE;
1153                         count = 1;
1154                 } else if (strcmp(cp, "--") == 0) {
1155                         positive = FALSE;
1156                         count = 2;
1157                 } else if (strcmp(cp, "+") == 0) {
1158                         positive = TRUE;
1159                         count = 1;
1160                 } else if (strcmp(cp, "++") == 0) {
1161                         positive = TRUE;
1162                         count = 2;
1163                 } else {
1164                         error(_("illegal CORRECTION field on Leap line"));
1165                         return;
1166                 }
1167                 if ((lp = byword(fields[LP_ROLL], leap_types)) == NULL) {
1168                         error(_("illegal Rolling/Stationary field on Leap line"));
1169                         return;
1170                 }
1171                 leapadd(tadd(t, tod), positive, lp->l_value, count);
1172         }
1173 }
1174
1175 static void
1176 inlink(fields, nfields)
1177 register char ** const  fields;
1178 const int               nfields;
1179 {
1180         struct link     l;
1181
1182         if (nfields != LINK_FIELDS) {
1183                 error(_("wrong number of fields on Link line"));
1184                 return;
1185         }
1186         if (*fields[LF_FROM] == '\0') {
1187                 error(_("blank FROM field on Link line"));
1188                 return;
1189         }
1190         if (*fields[LF_TO] == '\0') {
1191                 error(_("blank TO field on Link line"));
1192                 return;
1193         }
1194         l.l_filename = filename;
1195         l.l_linenum = linenum;
1196         l.l_from = ecpyalloc(fields[LF_FROM]);
1197         l.l_to = ecpyalloc(fields[LF_TO]);
1198         links = (struct link *) (void *) erealloc((char *) links,
1199                 (int) ((nlinks + 1) * sizeof *links));
1200         links[nlinks++] = l;
1201 }
1202
1203 static void
1204 rulesub(rp, loyearp, hiyearp, typep, monthp, dayp, timep)
1205 register struct rule * const    rp;
1206 const char * const              loyearp;
1207 const char * const              hiyearp;
1208 const char * const              typep;
1209 const char * const              monthp;
1210 const char * const              dayp;
1211 const char * const              timep;
1212 {
1213         register const struct lookup *  lp;
1214         register const char *           cp;
1215         register char *                 dp;
1216         register char *                 ep;
1217
1218         if ((lp = byword(monthp, mon_names)) == NULL) {
1219                 error(_("invalid month name"));
1220                 return;
1221         }
1222         rp->r_month = lp->l_value;
1223         rp->r_todisstd = FALSE;
1224         rp->r_todisgmt = FALSE;
1225         dp = ecpyalloc(timep);
1226         if (*dp != '\0') {
1227                 ep = dp + strlen(dp) - 1;
1228                 switch (lowerit(*ep)) {
1229                         case 's':       /* Standard */
1230                                 rp->r_todisstd = TRUE;
1231                                 rp->r_todisgmt = FALSE;
1232                                 *ep = '\0';
1233                                 break;
1234                         case 'w':       /* Wall */
1235                                 rp->r_todisstd = FALSE;
1236                                 rp->r_todisgmt = FALSE;
1237                                 *ep = '\0';
1238                                 break;
1239                         case 'g':       /* Greenwich */
1240                         case 'u':       /* Universal */
1241                         case 'z':       /* Zulu */
1242                                 rp->r_todisstd = TRUE;
1243                                 rp->r_todisgmt = TRUE;
1244                                 *ep = '\0';
1245                                 break;
1246                 }
1247         }
1248         rp->r_tod = gethms(dp, _("invalid time of day"), FALSE);
1249         ifree(dp);
1250         /*
1251         ** Year work.
1252         */
1253         cp = loyearp;
1254         lp = byword(cp, begin_years);
1255         if (lp != NULL) switch ((int) lp->l_value) {
1256                 case YR_MINIMUM:
1257                         rp->r_loyear = INT_MIN;
1258                         break;
1259                 case YR_MAXIMUM:
1260                         rp->r_loyear = INT_MAX;
1261                         break;
1262                 default:        /* "cannot happen" */
1263                         (void) fprintf(stderr,
1264                                 _("%s: panic: Invalid l_value %d\n"),
1265                                 progname, lp->l_value);
1266                         (void) exit(EXIT_FAILURE);
1267         } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_loyear) != 1) {
1268                 error(_("invalid starting year"));
1269                 return;
1270         } else if (noise) {
1271                 if (rp->r_loyear < min_year_representable)
1272                         warning(_("starting year too low to be represented"));
1273                 else if (rp->r_loyear > max_year_representable)
1274                         warning(_("starting year too high to be represented"));
1275         }
1276         cp = hiyearp;
1277         if ((lp = byword(cp, end_years)) != NULL) switch ((int) lp->l_value) {
1278                 case YR_MINIMUM:
1279                         rp->r_hiyear = INT_MIN;
1280                         break;
1281                 case YR_MAXIMUM:
1282                         rp->r_hiyear = INT_MAX;
1283                         break;
1284                 case YR_ONLY:
1285                         rp->r_hiyear = rp->r_loyear;
1286                         break;
1287                 default:        /* "cannot happen" */
1288                         (void) fprintf(stderr,
1289                                 _("%s: panic: Invalid l_value %d\n"),
1290                                 progname, lp->l_value);
1291                         (void) exit(EXIT_FAILURE);
1292         } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_hiyear) != 1) {
1293                 error(_("invalid ending year"));
1294                 return;
1295         } else if (noise) {
1296                 if (rp->r_loyear < min_year_representable)
1297                         warning(_("starting year too low to be represented"));
1298                 else if (rp->r_loyear > max_year_representable)
1299                         warning(_("starting year too high to be represented"));
1300         }
1301         if (rp->r_loyear > rp->r_hiyear) {
1302                 error(_("starting year greater than ending year"));
1303                 return;
1304         }
1305         if (*typep == '\0')
1306                 rp->r_yrtype = NULL;
1307         else {
1308                 if (rp->r_loyear == rp->r_hiyear) {
1309                         error(_("typed single year"));
1310                         return;
1311                 }
1312                 rp->r_yrtype = ecpyalloc(typep);
1313         }
1314         if (rp->r_loyear < min_year && rp->r_loyear > 0)
1315                 min_year = rp->r_loyear;
1316         /*
1317         ** Day work.
1318         ** Accept things such as:
1319         **      1
1320         **      last-Sunday
1321         **      Sun<=20
1322         **      Sun>=7
1323         */
1324         dp = ecpyalloc(dayp);
1325         if ((lp = byword(dp, lasts)) != NULL) {
1326                 rp->r_dycode = DC_DOWLEQ;
1327                 rp->r_wday = lp->l_value;
1328                 rp->r_dayofmonth = len_months[1][rp->r_month];
1329         } else {
1330                 if ((ep = strchr(dp, '<')) != 0)
1331                         rp->r_dycode = DC_DOWLEQ;
1332                 else if ((ep = strchr(dp, '>')) != 0)
1333                         rp->r_dycode = DC_DOWGEQ;
1334                 else {
1335                         ep = dp;
1336                         rp->r_dycode = DC_DOM;
1337                 }
1338                 if (rp->r_dycode != DC_DOM) {
1339                         *ep++ = 0;
1340                         if (*ep++ != '=') {
1341                                 error(_("invalid day of month"));
1342                                 ifree(dp);
1343                                 return;
1344                         }
1345                         if ((lp = byword(dp, wday_names)) == NULL) {
1346                                 error(_("invalid weekday name"));
1347                                 ifree(dp);
1348                                 return;
1349                         }
1350                         rp->r_wday = lp->l_value;
1351                 }
1352                 if (sscanf(ep, scheck(ep, "%d"), &rp->r_dayofmonth) != 1 ||
1353                         rp->r_dayofmonth <= 0 ||
1354                         (rp->r_dayofmonth > len_months[1][rp->r_month])) {
1355                                 error(_("invalid day of month"));
1356                                 ifree(dp);
1357                                 return;
1358                 }
1359         }
1360         ifree(dp);
1361 }
1362
1363 static void
1364 convert(val, buf)
1365 const long      val;
1366 char * const    buf;
1367 {
1368         register int    i;
1369         register long   shift;
1370
1371         for (i = 0, shift = 24; i < 4; ++i, shift -= 8)
1372                 buf[i] = val >> shift;
1373 }
1374
1375 static void
1376 puttzcode(val, fp)
1377 const long      val;
1378 FILE * const    fp;
1379 {
1380         char    buf[4];
1381
1382         convert(val, buf);
1383         (void) fwrite((void *) buf, (size_t) sizeof buf, (size_t) 1, fp);
1384 }
1385
1386 static int
1387 atcomp(avp, bvp)
1388 void *  avp;
1389 void *  bvp;
1390 {
1391         if (((struct attype *) avp)->at < ((struct attype *) bvp)->at)
1392                 return -1;
1393         else if (((struct attype *) avp)->at > ((struct attype *) bvp)->at)
1394                 return 1;
1395         else    return 0;
1396 }
1397
1398 static void
1399 writezone(name)
1400 const char * const      name;
1401 {
1402         register FILE *         fp;
1403         register int            i, j;
1404         static char *           fullname;
1405         static struct tzhead    tzh;
1406         time_t                  ats[TZ_MAX_TIMES];
1407         unsigned char           types[TZ_MAX_TIMES];
1408
1409         /*
1410         ** Sort.
1411         */
1412         if (timecnt > 1)
1413                 (void) qsort((void *) attypes, (size_t) timecnt,
1414                         (size_t) sizeof *attypes, atcomp);
1415         /*
1416         ** Optimize.
1417         */
1418         {
1419                 int     fromi;
1420                 int     toi;
1421
1422                 toi = 0;
1423                 fromi = 0;
1424                 while (fromi < timecnt && attypes[fromi].at < min_time)
1425                         ++fromi;
1426                 if (isdsts[0] == 0)
1427                         while (fromi < timecnt && attypes[fromi].type == 0)
1428                                 ++fromi;        /* handled by default rule */
1429                 for ( ; fromi < timecnt; ++fromi) {
1430                         if (toi != 0
1431                             && ((attypes[fromi].at
1432                                  + gmtoffs[attypes[toi - 1].type])
1433                                 <= (attypes[toi - 1].at
1434                                     + gmtoffs[toi == 1 ? 0
1435                                               : attypes[toi - 2].type]))) {
1436                                 attypes[toi - 1].type = attypes[fromi].type;
1437                                 continue;
1438                         }
1439                         if (toi == 0 ||
1440                                 attypes[toi - 1].type != attypes[fromi].type)
1441                                         attypes[toi++] = attypes[fromi];
1442                 }
1443                 timecnt = toi;
1444         }
1445         /*
1446         ** Transfer.
1447         */
1448         for (i = 0; i < timecnt; ++i) {
1449                 ats[i] = attypes[i].at;
1450                 types[i] = attypes[i].type;
1451         }
1452         fullname = erealloc(fullname,
1453                 (int) (strlen(directory) + 1 + strlen(name) + 1));
1454         (void) sprintf(fullname, "%s/%s", directory, name);
1455         /*
1456         ** Remove old file, if any, to snap links.
1457         */
1458         if (!itsdir(fullname) && remove(fullname) != 0 && errno != ENOENT) {
1459                 const char *e = strerror(errno);
1460
1461                 (void) fprintf(stderr, _("%s: Can't remove %s: %s\n"),
1462                         progname, fullname, e);
1463                 (void) exit(EXIT_FAILURE);
1464         }
1465         if ((fp = fopen(fullname, "wb")) == NULL) {
1466                 if (mkdirs(fullname) != 0)
1467                         (void) exit(EXIT_FAILURE);
1468                 if ((fp = fopen(fullname, "wb")) == NULL) {
1469                         const char *e = strerror(errno);
1470
1471                         (void) fprintf(stderr, _("%s: Can't create %s: %s\n"),
1472                                 progname, fullname, e);
1473                         (void) exit(EXIT_FAILURE);
1474                 }
1475         }
1476         convert(eitol(typecnt), tzh.tzh_ttisgmtcnt);
1477         convert(eitol(typecnt), tzh.tzh_ttisstdcnt);
1478         convert(eitol(leapcnt), tzh.tzh_leapcnt);
1479         convert(eitol(timecnt), tzh.tzh_timecnt);
1480         convert(eitol(typecnt), tzh.tzh_typecnt);
1481         convert(eitol(charcnt), tzh.tzh_charcnt);
1482         (void) strncpy(tzh.tzh_magic, TZ_MAGIC, sizeof tzh.tzh_magic);
1483 #define DO(field)       (void) fwrite((void *) tzh.field, (size_t) sizeof tzh.field, (size_t) 1, fp)
1484         DO(tzh_magic);
1485         DO(tzh_reserved);
1486         DO(tzh_ttisgmtcnt);
1487         DO(tzh_ttisstdcnt);
1488         DO(tzh_leapcnt);
1489         DO(tzh_timecnt);
1490         DO(tzh_typecnt);
1491         DO(tzh_charcnt);
1492 #undef DO
1493         for (i = 0; i < timecnt; ++i) {
1494                 j = leapcnt;
1495                 while (--j >= 0)
1496                         if (ats[i] >= trans[j]) {
1497                                 ats[i] = tadd(ats[i], corr[j]);
1498                                 break;
1499                         }
1500                 puttzcode((long) ats[i], fp);
1501         }
1502         if (timecnt > 0)
1503                 (void) fwrite((void *) types, (size_t) sizeof types[0],
1504                         (size_t) timecnt, fp);
1505         for (i = 0; i < typecnt; ++i) {
1506                 puttzcode((long) gmtoffs[i], fp);
1507                 (void) putc(isdsts[i], fp);
1508                 (void) putc(abbrinds[i], fp);
1509         }
1510         if (charcnt != 0)
1511                 (void) fwrite((void *) chars, (size_t) sizeof chars[0],
1512                         (size_t) charcnt, fp);
1513         for (i = 0; i < leapcnt; ++i) {
1514                 if (roll[i]) {
1515                         if (timecnt == 0 || trans[i] < ats[0]) {
1516                                 j = 0;
1517                                 while (isdsts[j])
1518                                         if (++j >= typecnt) {
1519                                                 j = 0;
1520                                                 break;
1521                                         }
1522                         } else {
1523                                 j = 1;
1524                                 while (j < timecnt && trans[i] >= ats[j])
1525                                         ++j;
1526                                 j = types[j - 1];
1527                         }
1528                         puttzcode((long) tadd(trans[i], -gmtoffs[j]), fp);
1529                 } else  puttzcode((long) trans[i], fp);
1530                 puttzcode((long) corr[i], fp);
1531         }
1532         for (i = 0; i < typecnt; ++i)
1533                 (void) putc(ttisstds[i], fp);
1534         for (i = 0; i < typecnt; ++i)
1535                 (void) putc(ttisgmts[i], fp);
1536         if (ferror(fp) || fclose(fp)) {
1537                 (void) fprintf(stderr, _("%s: Error writing %s\n"),
1538                         progname, fullname);
1539                 (void) exit(EXIT_FAILURE);
1540         }
1541 }
1542
1543 static void
1544 doabbr(abbr, format, letters, isdst)
1545 char * const            abbr;
1546 const char * const      format;
1547 const char * const      letters;
1548 const int               isdst;
1549 {
1550         if (strchr(format, '/') == NULL) {
1551                 if (letters == NULL)
1552                         (void) strcpy(abbr, format);
1553                 else    (void) sprintf(abbr, format, letters);
1554         } else if (isdst)
1555                 (void) strcpy(abbr, strchr(format, '/') + 1);
1556         else {
1557                 (void) strcpy(abbr, format);
1558                 *strchr(abbr, '/') = '\0';
1559         }
1560 }
1561
1562 static void
1563 outzone(zpfirst, zonecount)
1564 const struct zone * const       zpfirst;
1565 const int                       zonecount;
1566 {
1567         register const struct zone *    zp;
1568         register struct rule *          rp;
1569         register int                    i, j;
1570         register int                    usestart, useuntil;
1571         register time_t                 starttime, untiltime;
1572         register long                   gmtoff;
1573         register long                   stdoff;
1574         register int                    year;
1575         register long                   startoff;
1576         register int                    startttisstd;
1577         register int                    startttisgmt;
1578         register int                    type;
1579         char                            startbuf[BUFSIZ];
1580
1581         INITIALIZE(untiltime);
1582         INITIALIZE(starttime);
1583         /*
1584         ** Now. . .finally. . .generate some useful data!
1585         */
1586         timecnt = 0;
1587         typecnt = 0;
1588         charcnt = 0;
1589         /*
1590         ** A guess that may well be corrected later.
1591         */
1592         stdoff = 0;
1593         /*
1594         ** Thanks to Earl Chew (earl@dnd.icp.nec.com.au)
1595         ** for noting the need to unconditionally initialize startttisstd.
1596         */
1597         startttisstd = FALSE;
1598         startttisgmt = FALSE;
1599         for (i = 0; i < zonecount; ++i) {
1600                 zp = &zpfirst[i];
1601                 usestart = i > 0 && (zp - 1)->z_untiltime > min_time;
1602                 useuntil = i < (zonecount - 1);
1603                 if (useuntil && zp->z_untiltime <= min_time)
1604                         continue;
1605                 gmtoff = zp->z_gmtoff;
1606                 eat(zp->z_filename, zp->z_linenum);
1607                 *startbuf = '\0';
1608                 startoff = zp->z_gmtoff;
1609                 if (zp->z_nrules == 0) {
1610                         stdoff = zp->z_stdoff;
1611                         doabbr(startbuf, zp->z_format,
1612                                 (char *) NULL, stdoff != 0);
1613                         type = addtype(oadd(zp->z_gmtoff, stdoff),
1614                                 startbuf, stdoff != 0, startttisstd,
1615                                 startttisgmt);
1616                         if (usestart) {
1617                                 addtt(starttime, type);
1618                                 usestart = FALSE;
1619                         }
1620                         else if (stdoff != 0)
1621                                 addtt(min_time, type);
1622                 } else for (year = min_year; year <= max_year; ++year) {
1623                         if (useuntil && year > zp->z_untilrule.r_hiyear)
1624                                 break;
1625                         /*
1626                         ** Mark which rules to do in the current year.
1627                         ** For those to do, calculate rpytime(rp, year);
1628                         */
1629                         for (j = 0; j < zp->z_nrules; ++j) {
1630                                 rp = &zp->z_rules[j];
1631                                 eats(zp->z_filename, zp->z_linenum,
1632                                         rp->r_filename, rp->r_linenum);
1633                                 rp->r_todo = year >= rp->r_loyear &&
1634                                                 year <= rp->r_hiyear &&
1635                                                 yearistype(year, rp->r_yrtype);
1636                                 if (rp->r_todo)
1637                                         rp->r_temp = rpytime(rp, year);
1638                         }
1639                         for ( ; ; ) {
1640                                 register int    k;
1641                                 register time_t jtime, ktime;
1642                                 register long   offset;
1643                                 char            buf[BUFSIZ];
1644
1645                                 INITIALIZE(ktime);
1646                                 if (useuntil) {
1647                                         /*
1648                                         ** Turn untiltime into UTC
1649                                         ** assuming the current gmtoff and
1650                                         ** stdoff values.
1651                                         */
1652                                         untiltime = zp->z_untiltime;
1653                                         if (!zp->z_untilrule.r_todisgmt)
1654                                                 untiltime = tadd(untiltime,
1655                                                         -gmtoff);
1656                                         if (!zp->z_untilrule.r_todisstd)
1657                                                 untiltime = tadd(untiltime,
1658                                                         -stdoff);
1659                                 }
1660                                 /*
1661                                 ** Find the rule (of those to do, if any)
1662                                 ** that takes effect earliest in the year.
1663                                 */
1664                                 k = -1;
1665                                 for (j = 0; j < zp->z_nrules; ++j) {
1666                                         rp = &zp->z_rules[j];
1667                                         if (!rp->r_todo)
1668                                                 continue;
1669                                         eats(zp->z_filename, zp->z_linenum,
1670                                                 rp->r_filename, rp->r_linenum);
1671                                         offset = rp->r_todisgmt ? 0 : gmtoff;
1672                                         if (!rp->r_todisstd)
1673                                                 offset = oadd(offset, stdoff);
1674                                         jtime = rp->r_temp;
1675                                         if (jtime == min_time ||
1676                                                 jtime == max_time)
1677                                                         continue;
1678                                         jtime = tadd(jtime, -offset);
1679                                         if (k < 0 || jtime < ktime) {
1680                                                 k = j;
1681                                                 ktime = jtime;
1682                                         }
1683                                 }
1684                                 if (k < 0)
1685                                         break;  /* go on to next year */
1686                                 rp = &zp->z_rules[k];
1687                                 rp->r_todo = FALSE;
1688                                 if (useuntil && ktime >= untiltime)
1689                                         break;
1690                                 stdoff = rp->r_stdoff;
1691                                 if (usestart && ktime == starttime)
1692                                         usestart = FALSE;
1693                                 if (usestart) {
1694                                         if (ktime < starttime) {
1695                                                 startoff = oadd(zp->z_gmtoff,
1696                                                         stdoff);
1697                                                 doabbr(startbuf, zp->z_format,
1698                                                         rp->r_abbrvar,
1699                                                         rp->r_stdoff != 0);
1700                                                 continue;
1701                                         }
1702                                         if (*startbuf == '\0' &&
1703                                             startoff == oadd(zp->z_gmtoff,
1704                                             stdoff)) {
1705                                                 doabbr(startbuf, zp->z_format,
1706                                                         rp->r_abbrvar,
1707                                                         rp->r_stdoff != 0);
1708                                         }
1709                                 }
1710                                 eats(zp->z_filename, zp->z_linenum,
1711                                         rp->r_filename, rp->r_linenum);
1712                                 doabbr(buf, zp->z_format, rp->r_abbrvar,
1713                                         rp->r_stdoff != 0);
1714                                 offset = oadd(zp->z_gmtoff, rp->r_stdoff);
1715                                 type = addtype(offset, buf, rp->r_stdoff != 0,
1716                                         rp->r_todisstd, rp->r_todisgmt);
1717                                 addtt(ktime, type);
1718                         }
1719                 }
1720                 if (usestart) {
1721                         if (*startbuf == '\0' &&
1722                                 zp->z_format != NULL &&
1723                                 strchr(zp->z_format, '%') == NULL &&
1724                                 strchr(zp->z_format, '/') == NULL)
1725                                         (void) strcpy(startbuf, zp->z_format);
1726                         eat(zp->z_filename, zp->z_linenum);
1727                         if (*startbuf == '\0')
1728 error(_("can't determine time zone abbreviation to use just after until time"));
1729                         else    addtt(starttime,
1730                                         addtype(startoff, startbuf,
1731                                                 startoff != zp->z_gmtoff,
1732                                                 startttisstd,
1733                                                 startttisgmt));
1734                 }
1735                 /*
1736                 ** Now we may get to set starttime for the next zone line.
1737                 */
1738                 if (useuntil) {
1739                         startttisstd = zp->z_untilrule.r_todisstd;
1740                         startttisgmt = zp->z_untilrule.r_todisgmt;
1741                         starttime = zp->z_untiltime;
1742                         if (!startttisstd)
1743                                 starttime = tadd(starttime, -stdoff);
1744                         if (!startttisgmt)
1745                                 starttime = tadd(starttime, -gmtoff);
1746                 }
1747         }
1748         writezone(zpfirst->z_name);
1749 }
1750
1751 static void
1752 addtt(starttime, type)
1753 const time_t    starttime;
1754 int             type;
1755 {
1756         if (starttime <= min_time ||
1757                 (timecnt == 1 && attypes[0].at < min_time)) {
1758                 gmtoffs[0] = gmtoffs[type];
1759                 isdsts[0] = isdsts[type];
1760                 ttisstds[0] = ttisstds[type];
1761                 ttisgmts[0] = ttisgmts[type];
1762                 if (abbrinds[type] != 0)
1763                         (void) strcpy(chars, &chars[abbrinds[type]]);
1764                 abbrinds[0] = 0;
1765                 charcnt = strlen(chars) + 1;
1766                 typecnt = 1;
1767                 timecnt = 0;
1768                 type = 0;
1769         }
1770         if (timecnt >= TZ_MAX_TIMES) {
1771                 error(_("too many transitions?!"));
1772                 (void) exit(EXIT_FAILURE);
1773         }
1774         attypes[timecnt].at = starttime;
1775         attypes[timecnt].type = type;
1776         ++timecnt;
1777 }
1778
1779 static int
1780 addtype(gmtoff, abbr, isdst, ttisstd, ttisgmt)
1781 const long              gmtoff;
1782 const char * const      abbr;
1783 const int               isdst;
1784 const int               ttisstd;
1785 const int               ttisgmt;
1786 {
1787         register int    i, j;
1788
1789         if (isdst != TRUE && isdst != FALSE) {
1790                 error(_("internal error - addtype called with bad isdst"));
1791                 (void) exit(EXIT_FAILURE);
1792         }
1793         if (ttisstd != TRUE && ttisstd != FALSE) {
1794                 error(_("internal error - addtype called with bad ttisstd"));
1795                 (void) exit(EXIT_FAILURE);
1796         }
1797         if (ttisgmt != TRUE && ttisgmt != FALSE) {
1798                 error(_("internal error - addtype called with bad ttisgmt"));
1799                 (void) exit(EXIT_FAILURE);
1800         }
1801         /*
1802         ** See if there's already an entry for this zone type.
1803         ** If so, just return its index.
1804         */
1805         for (i = 0; i < typecnt; ++i) {
1806                 if (gmtoff == gmtoffs[i] && isdst == isdsts[i] &&
1807                         strcmp(abbr, &chars[abbrinds[i]]) == 0 &&
1808                         ttisstd == ttisstds[i] &&
1809                         ttisgmt == ttisgmts[i])
1810                                 return i;
1811         }
1812         /*
1813         ** There isn't one; add a new one, unless there are already too
1814         ** many.
1815         */
1816         if (typecnt >= TZ_MAX_TYPES) {
1817                 error(_("too many local time types"));
1818                 (void) exit(EXIT_FAILURE);
1819         }
1820         gmtoffs[i] = gmtoff;
1821         isdsts[i] = isdst;
1822         ttisstds[i] = ttisstd;
1823         ttisgmts[i] = ttisgmt;
1824
1825         for (j = 0; j < charcnt; ++j)
1826                 if (strcmp(&chars[j], abbr) == 0)
1827                         break;
1828         if (j == charcnt)
1829                 newabbr(abbr);
1830         abbrinds[i] = j;
1831         ++typecnt;
1832         return i;
1833 }
1834
1835 static void
1836 leapadd(t, positive, rolling, count)
1837 const time_t    t;
1838 const int       positive;
1839 const int       rolling;
1840 int             count;
1841 {
1842         register int    i, j;
1843
1844         if (leapcnt + (positive ? count : 1) > TZ_MAX_LEAPS) {
1845                 error(_("too many leap seconds"));
1846                 (void) exit(EXIT_FAILURE);
1847         }
1848         for (i = 0; i < leapcnt; ++i)
1849                 if (t <= trans[i]) {
1850                         if (t == trans[i]) {
1851                                 error(_("repeated leap second moment"));
1852                                 (void) exit(EXIT_FAILURE);
1853                         }
1854                         break;
1855                 }
1856         do {
1857                 for (j = leapcnt; j > i; --j) {
1858                         trans[j] = trans[j - 1];
1859                         corr[j] = corr[j - 1];
1860                         roll[j] = roll[j - 1];
1861                 }
1862                 trans[i] = t;
1863                 corr[i] = positive ? 1L : eitol(-count);
1864                 roll[i] = rolling;
1865                 ++leapcnt;
1866         } while (positive && --count != 0);
1867 }
1868
1869 static void
1870 adjleap P((void))
1871 {
1872         register int    i;
1873         register long   last = 0;
1874
1875         /*
1876         ** propagate leap seconds forward
1877         */
1878         for (i = 0; i < leapcnt; ++i) {
1879                 trans[i] = tadd(trans[i], last);
1880                 last = corr[i] += last;
1881         }
1882 }
1883
1884 static int
1885 yearistype(year, type)
1886 const int               year;
1887 const char * const      type;
1888 {
1889         static char *   buf;
1890         int             result;
1891
1892         if (type == NULL || *type == '\0')
1893                 return TRUE;
1894         buf = erealloc(buf, (int) (132 + strlen(yitcommand) + strlen(type)));
1895         (void) sprintf(buf, "%s %d %s", yitcommand, year, type);
1896         result = system(buf);
1897         if (result == 0)
1898                 return TRUE;
1899         if (result == (1 << 8))
1900                 return FALSE;
1901         error(_("Wild result from command execution"));
1902         (void) fprintf(stderr, _("%s: command was '%s', result was %d\n"),
1903                 progname, buf, result);
1904         for ( ; ; )
1905                 (void) exit(EXIT_FAILURE);
1906 }
1907
1908 static int
1909 lowerit(a)
1910 int     a;
1911 {
1912         a = (unsigned char) a;
1913         return (isascii(a) && isupper(a)) ? tolower(a) : a;
1914 }
1915
1916 static int
1917 ciequal(ap, bp)         /* case-insensitive equality */
1918 register const char *   ap;
1919 register const char *   bp;
1920 {
1921         while (lowerit(*ap) == lowerit(*bp++))
1922                 if (*ap++ == '\0')
1923                         return TRUE;
1924         return FALSE;
1925 }
1926
1927 static int
1928 itsabbr(abbr, word)
1929 register const char *   abbr;
1930 register const char *   word;
1931 {
1932         if (lowerit(*abbr) != lowerit(*word))
1933                 return FALSE;
1934         ++word;
1935         while (*++abbr != '\0')
1936                 do {
1937                         if (*word == '\0')
1938                                 return FALSE;
1939                 } while (lowerit(*word++) != lowerit(*abbr));
1940         return TRUE;
1941 }
1942
1943 static const struct lookup *
1944 byword(word, table)
1945 register const char * const             word;
1946 register const struct lookup * const    table;
1947 {
1948         register const struct lookup *  foundlp;
1949         register const struct lookup *  lp;
1950
1951         if (word == NULL || table == NULL)
1952                 return NULL;
1953         /*
1954         ** Look for exact match.
1955         */
1956         for (lp = table; lp->l_word != NULL; ++lp)
1957                 if (ciequal(word, lp->l_word))
1958                         return lp;
1959         /*
1960         ** Look for inexact match.
1961         */
1962         foundlp = NULL;
1963         for (lp = table; lp->l_word != NULL; ++lp)
1964                 if (itsabbr(word, lp->l_word)) {
1965                         if (foundlp == NULL)
1966                                 foundlp = lp;
1967                         else    return NULL;    /* multiple inexact matches */
1968                 }
1969         return foundlp;
1970 }
1971
1972 static char **
1973 getfields(cp)
1974 register char * cp;
1975 {
1976         register char *         dp;
1977         register char **        array;
1978         register int            nsubs;
1979
1980         if (cp == NULL)
1981                 return NULL;
1982         array = (char **) (void *)
1983                 emalloc((int) ((strlen(cp) + 1) * sizeof *array));
1984         nsubs = 0;
1985         for ( ; ; ) {
1986                 while (isascii(*cp) && isspace((unsigned char) *cp))
1987                         ++cp;
1988                 if (*cp == '\0' || *cp == '#')
1989                         break;
1990                 array[nsubs++] = dp = cp;
1991                 do {
1992                         if ((*dp = *cp++) != '"')
1993                                 ++dp;
1994                         else while ((*dp = *cp++) != '"')
1995                                 if (*dp != '\0')
1996                                         ++dp;
1997                                 else    error(_("Odd number of quotation marks"));
1998                 } while (*cp != '\0' && *cp != '#' &&
1999                         (!isascii(*cp) || !isspace((unsigned char) *cp)));
2000                 if (isascii(*cp) && isspace((unsigned char) *cp))
2001                         ++cp;
2002                 *dp = '\0';
2003         }
2004         array[nsubs] = NULL;
2005         return array;
2006 }
2007
2008 static long
2009 oadd(t1, t2)
2010 const long      t1;
2011 const long      t2;
2012 {
2013         register long   t;
2014
2015         t = t1 + t2;
2016         if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {
2017                 error(_("time overflow"));
2018                 (void) exit(EXIT_FAILURE);
2019         }
2020         return t;
2021 }
2022
2023 static time_t
2024 tadd(t1, t2)
2025 const time_t    t1;
2026 const long      t2;
2027 {
2028         register time_t t;
2029
2030         if (t1 == max_time && t2 > 0)
2031                 return max_time;
2032         if (t1 == min_time && t2 < 0)
2033                 return min_time;
2034         t = t1 + t2;
2035         if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {
2036                 error(_("time overflow"));
2037                 (void) exit(EXIT_FAILURE);
2038         }
2039         return t;
2040 }
2041
2042 /*
2043 ** Given a rule, and a year, compute the date - in seconds since January 1,
2044 ** 1970, 00:00 LOCAL time - in that year that the rule refers to.
2045 */
2046
2047 static time_t
2048 rpytime(rp, wantedy)
2049 register const struct rule * const      rp;
2050 register const int                      wantedy;
2051 {
2052         register int    y, m, i;
2053         register long   dayoff;                 /* with a nod to Margaret O. */
2054         register time_t t;
2055
2056         if (wantedy == INT_MIN)
2057                 return min_time;
2058         if (wantedy == INT_MAX)
2059                 return max_time;
2060         dayoff = 0;
2061         m = TM_JANUARY;
2062         y = EPOCH_YEAR;
2063         while (wantedy != y) {
2064                 if (wantedy > y) {
2065                         i = len_years[isleap(y)];
2066                         ++y;
2067                 } else {
2068                         --y;
2069                         i = -len_years[isleap(y)];
2070                 }
2071                 dayoff = oadd(dayoff, eitol(i));
2072         }
2073         while (m != rp->r_month) {
2074                 i = len_months[isleap(y)][m];
2075                 dayoff = oadd(dayoff, eitol(i));
2076                 ++m;
2077         }
2078         i = rp->r_dayofmonth;
2079         if (m == TM_FEBRUARY && i == 29 && !isleap(y)) {
2080                 if (rp->r_dycode == DC_DOWLEQ)
2081                         --i;
2082                 else {
2083                         error(_("use of 2/29 in non leap-year"));
2084                         (void) exit(EXIT_FAILURE);
2085                 }
2086         }
2087         --i;
2088         dayoff = oadd(dayoff, eitol(i));
2089         if (rp->r_dycode == DC_DOWGEQ || rp->r_dycode == DC_DOWLEQ) {
2090                 register long   wday;
2091
2092 #define LDAYSPERWEEK    ((long) DAYSPERWEEK)
2093                 wday = eitol(EPOCH_WDAY);
2094                 /*
2095                 ** Don't trust mod of negative numbers.
2096                 */
2097                 if (dayoff >= 0)
2098                         wday = (wday + dayoff) % LDAYSPERWEEK;
2099                 else {
2100                         wday -= ((-dayoff) % LDAYSPERWEEK);
2101                         if (wday < 0)
2102                                 wday += LDAYSPERWEEK;
2103                 }
2104                 while (wday != eitol(rp->r_wday))
2105                         if (rp->r_dycode == DC_DOWGEQ) {
2106                                 dayoff = oadd(dayoff, (long) 1);
2107                                 if (++wday >= LDAYSPERWEEK)
2108                                         wday = 0;
2109                                 ++i;
2110                         } else {
2111                                 dayoff = oadd(dayoff, (long) -1);
2112                                 if (--wday < 0)
2113                                         wday = LDAYSPERWEEK - 1;
2114                                 --i;
2115                         }
2116                 if (i < 0 || i >= len_months[isleap(y)][m]) {
2117                         error(_("no day in month matches rule"));
2118                         (void) exit(EXIT_FAILURE);
2119                 }
2120         }
2121         if (dayoff < 0 && !TYPE_SIGNED(time_t))
2122                 return min_time;
2123         t = (time_t) dayoff * SECSPERDAY;
2124         /*
2125         ** Cheap overflow check.
2126         */
2127         if (t / SECSPERDAY != dayoff)
2128                 return (dayoff > 0) ? max_time : min_time;
2129         return tadd(t, rp->r_tod);
2130 }
2131
2132 static void
2133 newabbr(string)
2134 const char * const      string;
2135 {
2136         register int    i;
2137
2138         i = strlen(string) + 1;
2139         if (charcnt + i > TZ_MAX_CHARS) {
2140                 error(_("too many, or too long, time zone abbreviations"));
2141                 (void) exit(EXIT_FAILURE);
2142         }
2143         (void) strcpy(&chars[charcnt], string);
2144         charcnt += eitol(i);
2145 }
2146
2147 static int
2148 mkdirs(argname)
2149 char * const    argname;
2150 {
2151         register char * name;
2152         register char * cp;
2153
2154         if (argname == NULL || *argname == '\0')
2155                 return 0;
2156         cp = name = ecpyalloc(argname);
2157         while ((cp = strchr(cp + 1, '/')) != 0) {
2158                 *cp = '\0';
2159 #ifndef unix
2160                 /*
2161                 ** DOS drive specifier?
2162                 */
2163                 if (isalpha((unsigned char) name[0]) &&
2164                         name[1] == ':' && name[2] == '\0') {
2165                                 *cp = '/';
2166                                 continue;
2167                 }
2168 #endif /* !defined unix */
2169                 if (!itsdir(name)) {
2170                         /*
2171                         ** It doesn't seem to exist, so we try to create it.
2172                         ** Creation may fail because of the directory being
2173                         ** created by some other multiprocessor, so we get
2174                         ** to do extra checking.
2175                         */
2176                         if (mkdir(name, S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH) != 0) {
2177                                 const char *e = strerror(errno);
2178
2179                                 if (errno != EEXIST || !itsdir(name)) {
2180                                         (void) fprintf(stderr,
2181 _("%s: Can't create directory %s: %s\n"),
2182                                                 progname, name, e);
2183                                         ifree(name);
2184                                         return -1;
2185                                 }
2186                         }
2187                 }
2188                 *cp = '/';
2189         }
2190         ifree(name);
2191         return 0;
2192 }
2193
2194 static long
2195 eitol(i)
2196 const int       i;
2197 {
2198         long    l;
2199
2200         l = i;
2201         if ((i < 0 && l >= 0) || (i == 0 && l != 0) || (i > 0 && l <= 0)) {
2202                 (void) fprintf(stderr,
2203                         _("%s: %d did not sign extend correctly\n"),
2204                         progname, i);
2205                 (void) exit(EXIT_FAILURE);
2206         }
2207         return l;
2208 }
2209
2210 /*
2211 ** UNIX was a registered trademark of UNIX System Laboratories in 1993.
2212 */