Replace lll_private_futex_* (*) with lll_futex_* (*, LLL_PRIVATE).
[kopensolaris-gnu/glibc.git] / timezone / zic.c
1 /*
2 ** This file is in the public domain, so clarified as of
3 ** 2006-07-17 by Arthur David Olson.
4 */
5
6 static char     elsieid[] = "@(#)zic.c  8.11";
7
8 #include "private.h"
9 #include "locale.h"
10 #include "tzfile.h"
11
12 #define ZIC_VERSION     '2'
13
14 typedef int_fast64_t    zic_t;
15
16 #ifndef ZIC_MAX_ABBR_LEN_WO_WARN
17 #define ZIC_MAX_ABBR_LEN_WO_WARN        6
18 #endif /* !defined ZIC_MAX_ABBR_LEN_WO_WARN */
19
20 #if HAVE_SYS_STAT_H
21 #include "sys/stat.h"
22 #endif
23 #ifdef S_IRUSR
24 #define MKDIR_UMASK (S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH)
25 #else
26 #define MKDIR_UMASK 0755
27 #endif
28
29 /*
30 ** On some ancient hosts, predicates like `isspace(C)' are defined
31 ** only if isascii(C) || C == EOF. Modern hosts obey the C Standard,
32 ** which says they are defined only if C == ((unsigned char) C) || C == EOF.
33 ** Neither the C Standard nor Posix require that `isascii' exist.
34 ** For portability, we check both ancient and modern requirements.
35 ** If isascii is not defined, the isascii check succeeds trivially.
36 */
37 #include "ctype.h"
38 #ifndef isascii
39 #define isascii(x) 1
40 #endif
41
42 #define OFFSET_STRLEN_MAXIMUM   (7 + INT_STRLEN_MAXIMUM(long))
43 #define RULE_STRLEN_MAXIMUM     8       /* "Mdd.dd.d" */
44
45 #define end(cp) (strchr((cp), '\0'))
46
47 struct rule {
48         const char *    r_filename;
49         int             r_linenum;
50         const char *    r_name;
51
52         int             r_loyear;       /* for example, 1986 */
53         int             r_hiyear;       /* for example, 1986 */
54         const char *    r_yrtype;
55         int             r_lowasnum;
56         int             r_hiwasnum;
57
58         int             r_month;        /* 0..11 */
59
60         int             r_dycode;       /* see below */
61         int             r_dayofmonth;
62         int             r_wday;
63
64         long            r_tod;          /* time from midnight */
65         int             r_todisstd;     /* above is standard time if TRUE */
66                                         /* or wall clock time if FALSE */
67         int             r_todisgmt;     /* above is GMT if TRUE */
68                                         /* or local time if FALSE */
69         long            r_stdoff;       /* offset from standard time */
70         const char *    r_abbrvar;      /* variable part of abbreviation */
71
72         int             r_todo;         /* a rule to do (used in outzone) */
73         zic_t           r_temp;         /* used in outzone */
74 };
75
76 /*
77 **      r_dycode                r_dayofmonth    r_wday
78 */
79
80 #define DC_DOM          0       /* 1..31 */     /* unused */
81 #define DC_DOWGEQ       1       /* 1..31 */     /* 0..6 (Sun..Sat) */
82 #define DC_DOWLEQ       2       /* 1..31 */     /* 0..6 (Sun..Sat) */
83
84 struct zone {
85         const char *    z_filename;
86         int             z_linenum;
87
88         const char *    z_name;
89         long            z_gmtoff;
90         const char *    z_rule;
91         const char *    z_format;
92
93         long            z_stdoff;
94
95         struct rule *   z_rules;
96         int             z_nrules;
97
98         struct rule     z_untilrule;
99         zic_t           z_untiltime;
100 };
101
102 extern int      getopt P((int argc, char * const argv[],
103                         const char * options));
104 extern int      link P((const char * fromname, const char * toname));
105 extern char *   optarg;
106 extern int      optind;
107
108 static void     addtt P((zic_t starttime, int type));
109 static int      addtype P((long gmtoff, const char * abbr, int isdst,
110                                 int ttisstd, int ttisgmt));
111 static void     leapadd P((zic_t t, int positive, int rolling, int count));
112 static void     adjleap P((void));
113 static void     associate P((void));
114 static int      ciequal P((const char * ap, const char * bp));
115 static void     convert P((long val, char * buf));
116 static void     convert64 P((zic_t val, char * buf));
117 static void     dolink P((const char * fromfile, const char * tofile));
118 static void     doabbr P((char * abbr, const char * format,
119                         const char * letters, int isdst, int doquotes));
120 static void     eat P((const char * name, int num));
121 static void     eats P((const char * name, int num,
122                         const char * rname, int rnum));
123 static long     eitol P((int i));
124 static void     error P((const char * message));
125 static char **  getfields P((char * buf));
126 static long     gethms P((const char * string, const char * errstrng,
127                         int signable));
128 static void     infile P((const char * filename));
129 static void     inleap P((char ** fields, int nfields));
130 static void     inlink P((char ** fields, int nfields));
131 static void     inrule P((char ** fields, int nfields));
132 static int      inzcont P((char ** fields, int nfields));
133 static int      inzone P((char ** fields, int nfields));
134 static int      inzsub P((char ** fields, int nfields, int iscont));
135 static int      is32 P((zic_t x));
136 static int      itsabbr P((const char * abbr, const char * word));
137 static int      itsdir P((const char * name));
138 static int      lowerit P((int c));
139 static char *   memcheck P((char * tocheck));
140 static int      mkdirs P((char * filename));
141 static void     newabbr P((const char * abbr));
142 static long     oadd P((long t1, long t2));
143 static void     outzone P((const struct zone * zp, int ntzones));
144 static void     puttzcode P((long code, FILE * fp));
145 static void     puttzcode64 P((zic_t code, FILE * fp));
146 static int      rcomp P((const void * leftp, const void * rightp));
147 static zic_t    rpytime P((const struct rule * rp, int wantedy));
148 static void     rulesub P((struct rule * rp,
149                         const char * loyearp, const char * hiyearp,
150                         const char * typep, const char * monthp,
151                         const char * dayp, const char * timep));
152 static int      stringoffset P((char * result, long offset));
153 static int      stringrule P((char * result, const struct rule * rp,
154                         long dstoff, long gmtoff));
155 static void     stringzone P((char * result,
156                         const struct zone * zp, int ntzones));
157 static void     setboundaries P((void));
158 static zic_t    tadd P((zic_t t1, long t2));
159 static void     usage P((void));
160 static void     writezone P((const char * name, const char * string));
161 static int      yearistype P((int year, const char * type));
162
163 #if !HAVE_STRERROR
164 static char *   strerror P((int));
165 #endif /* !HAVE_STRERROR */
166
167 static int              charcnt;
168 static int              errors;
169 static const char *     filename;
170 static int              leapcnt;
171 static int              leapseen;
172 static int              leapminyear;
173 static int              leapmaxyear;
174 static int              linenum;
175 static int              max_abbrvar_len;
176 static int              max_format_len;
177 static zic_t            max_time;
178 static int              max_year;
179 static zic_t            min_time;
180 static int              min_year;
181 static int              noise;
182 static const char *     rfilename;
183 static int              rlinenum;
184 static const char *     progname;
185 static int              timecnt;
186 static int              typecnt;
187
188 /*
189 ** Line codes.
190 */
191
192 #define LC_RULE         0
193 #define LC_ZONE         1
194 #define LC_LINK         2
195 #define LC_LEAP         3
196
197 /*
198 ** Which fields are which on a Zone line.
199 */
200
201 #define ZF_NAME         1
202 #define ZF_GMTOFF       2
203 #define ZF_RULE         3
204 #define ZF_FORMAT       4
205 #define ZF_TILYEAR      5
206 #define ZF_TILMONTH     6
207 #define ZF_TILDAY       7
208 #define ZF_TILTIME      8
209 #define ZONE_MINFIELDS  5
210 #define ZONE_MAXFIELDS  9
211
212 /*
213 ** Which fields are which on a Zone continuation line.
214 */
215
216 #define ZFC_GMTOFF      0
217 #define ZFC_RULE        1
218 #define ZFC_FORMAT      2
219 #define ZFC_TILYEAR     3
220 #define ZFC_TILMONTH    4
221 #define ZFC_TILDAY      5
222 #define ZFC_TILTIME     6
223 #define ZONEC_MINFIELDS 3
224 #define ZONEC_MAXFIELDS 7
225
226 /*
227 ** Which files are which on a Rule line.
228 */
229
230 #define RF_NAME         1
231 #define RF_LOYEAR       2
232 #define RF_HIYEAR       3
233 #define RF_COMMAND      4
234 #define RF_MONTH        5
235 #define RF_DAY          6
236 #define RF_TOD          7
237 #define RF_STDOFF       8
238 #define RF_ABBRVAR      9
239 #define RULE_FIELDS     10
240
241 /*
242 ** Which fields are which on a Link line.
243 */
244
245 #define LF_FROM         1
246 #define LF_TO           2
247 #define LINK_FIELDS     3
248
249 /*
250 ** Which fields are which on a Leap line.
251 */
252
253 #define LP_YEAR         1
254 #define LP_MONTH        2
255 #define LP_DAY          3
256 #define LP_TIME         4
257 #define LP_CORR         5
258 #define LP_ROLL         6
259 #define LEAP_FIELDS     7
260
261 /*
262 ** Year synonyms.
263 */
264
265 #define YR_MINIMUM      0
266 #define YR_MAXIMUM      1
267 #define YR_ONLY         2
268
269 static struct rule *    rules;
270 static int              nrules; /* number of rules */
271
272 static struct zone *    zones;
273 static int              nzones; /* number of zones */
274
275 struct link {
276         const char *    l_filename;
277         int             l_linenum;
278         const char *    l_from;
279         const char *    l_to;
280 };
281
282 static struct link *    links;
283 static int              nlinks;
284
285 struct lookup {
286         const char *    l_word;
287         const int       l_value;
288 };
289
290 static struct lookup const *    byword P((const char * string,
291                                         const struct lookup * lp));
292
293 static struct lookup const      line_codes[] = {
294         { "Rule",       LC_RULE },
295         { "Zone",       LC_ZONE },
296         { "Link",       LC_LINK },
297         { "Leap",       LC_LEAP },
298         { NULL,         0}
299 };
300
301 static struct lookup const      mon_names[] = {
302         { "January",    TM_JANUARY },
303         { "February",   TM_FEBRUARY },
304         { "March",      TM_MARCH },
305         { "April",      TM_APRIL },
306         { "May",        TM_MAY },
307         { "June",       TM_JUNE },
308         { "July",       TM_JULY },
309         { "August",     TM_AUGUST },
310         { "September",  TM_SEPTEMBER },
311         { "October",    TM_OCTOBER },
312         { "November",   TM_NOVEMBER },
313         { "December",   TM_DECEMBER },
314         { NULL,         0 }
315 };
316
317 static struct lookup const      wday_names[] = {
318         { "Sunday",     TM_SUNDAY },
319         { "Monday",     TM_MONDAY },
320         { "Tuesday",    TM_TUESDAY },
321         { "Wednesday",  TM_WEDNESDAY },
322         { "Thursday",   TM_THURSDAY },
323         { "Friday",     TM_FRIDAY },
324         { "Saturday",   TM_SATURDAY },
325         { NULL,         0 }
326 };
327
328 static struct lookup const      lasts[] = {
329         { "last-Sunday",        TM_SUNDAY },
330         { "last-Monday",        TM_MONDAY },
331         { "last-Tuesday",       TM_TUESDAY },
332         { "last-Wednesday",     TM_WEDNESDAY },
333         { "last-Thursday",      TM_THURSDAY },
334         { "last-Friday",        TM_FRIDAY },
335         { "last-Saturday",      TM_SATURDAY },
336         { NULL,                 0 }
337 };
338
339 static struct lookup const      begin_years[] = {
340         { "minimum",    YR_MINIMUM },
341         { "maximum",    YR_MAXIMUM },
342         { NULL,         0 }
343 };
344
345 static struct lookup const      end_years[] = {
346         { "minimum",    YR_MINIMUM },
347         { "maximum",    YR_MAXIMUM },
348         { "only",       YR_ONLY },
349         { NULL,         0 }
350 };
351
352 static struct lookup const      leap_types[] = {
353         { "Rolling",    TRUE },
354         { "Stationary", FALSE },
355         { NULL,         0 }
356 };
357
358 static const int        len_months[2][MONSPERYEAR] = {
359         { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
360         { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
361 };
362
363 static const int        len_years[2] = {
364         DAYSPERNYEAR, DAYSPERLYEAR
365 };
366
367 static struct attype {
368         zic_t           at;
369         unsigned char   type;
370 }                       attypes[TZ_MAX_TIMES];
371 static long             gmtoffs[TZ_MAX_TYPES];
372 static char             isdsts[TZ_MAX_TYPES];
373 static unsigned char    abbrinds[TZ_MAX_TYPES];
374 static char             ttisstds[TZ_MAX_TYPES];
375 static char             ttisgmts[TZ_MAX_TYPES];
376 static char             chars[TZ_MAX_CHARS];
377 static zic_t            trans[TZ_MAX_LEAPS];
378 static long             corr[TZ_MAX_LEAPS];
379 static char             roll[TZ_MAX_LEAPS];
380
381 /*
382 ** Memory allocation.
383 */
384
385 static char *
386 memcheck(ptr)
387 char * const    ptr;
388 {
389         if (ptr == NULL) {
390                 const char *e = strerror(errno);
391
392                 (void) fprintf(stderr, _("%s: Memory exhausted: %s\n"),
393                         progname, e);
394                 exit(EXIT_FAILURE);
395         }
396         return ptr;
397 }
398
399 #define emalloc(size)           memcheck(imalloc(size))
400 #define erealloc(ptr, size)     memcheck(irealloc((ptr), (size)))
401 #define ecpyalloc(ptr)          memcheck(icpyalloc(ptr))
402 #define ecatalloc(oldp, newp)   memcheck(icatalloc((oldp), (newp)))
403
404 /*
405 ** Error handling.
406 */
407
408 #if !HAVE_STRERROR
409 static char *
410 strerror(errnum)
411 int     errnum;
412 {
413         extern char *   sys_errlist[];
414         extern int      sys_nerr;
415
416         return (errnum > 0 && errnum <= sys_nerr) ?
417                 sys_errlist[errnum] : _("Unknown system error");
418 }
419 #endif /* !HAVE_STRERROR */
420
421 static void
422 eats(name, num, rname, rnum)
423 const char * const      name;
424 const int               num;
425 const char * const      rname;
426 const int               rnum;
427 {
428         filename = name;
429         linenum = num;
430         rfilename = rname;
431         rlinenum = rnum;
432 }
433
434 static void
435 eat(name, num)
436 const char * const      name;
437 const int               num;
438 {
439         eats(name, num, (char *) NULL, -1);
440 }
441
442 static void
443 error(string)
444 const char * const      string;
445 {
446         /*
447         ** Match the format of "cc" to allow sh users to
448         **      zic ... 2>&1 | error -t "*" -v
449         ** on BSD systems.
450         */
451         (void) fprintf(stderr, _("\"%s\", line %d: %s"),
452                 filename, linenum, string);
453         if (rfilename != NULL)
454                 (void) fprintf(stderr, _(" (rule from \"%s\", line %d)"),
455                         rfilename, rlinenum);
456         (void) fprintf(stderr, "\n");
457         ++errors;
458 }
459
460 static void
461 warning(string)
462 const char * const      string;
463 {
464         char *  cp;
465
466         cp = ecpyalloc(_("warning: "));
467         cp = ecatalloc(cp, string);
468         error(cp);
469         ifree(cp);
470         --errors;
471 }
472
473 static void
474 usage P((void))
475 {
476         (void) fprintf(stderr, _("%s: usage is %s \
477 [ --version ] [ -v ] [ -l localtime ] [ -p posixrules ] \\\n\
478 \t[ -d directory ] [ -L leapseconds ] [ -y yearistype ] [ filename ... ]\n"),
479                 progname, progname);
480         exit(EXIT_FAILURE);
481 }
482
483 static const char *     psxrules;
484 static const char *     lcltime;
485 static const char *     directory;
486 static const char *     leapsec;
487 static const char *     yitcommand;
488
489 int
490 main(argc, argv)
491 int     argc;
492 char *  argv[];
493 {
494         register int    i;
495         register int    j;
496         register int    c;
497
498 #ifdef unix
499         (void) umask(umask(S_IWGRP | S_IWOTH) | (S_IWGRP | S_IWOTH));
500 #endif /* defined unix */
501 #if HAVE_GETTEXT
502         (void) setlocale(LC_ALL, "");
503 #ifdef TZ_DOMAINDIR
504         (void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR);
505 #endif /* defined TEXTDOMAINDIR */
506         (void) textdomain(TZ_DOMAIN);
507 #endif /* HAVE_GETTEXT */
508         progname = argv[0];
509         if (TYPE_BIT(zic_t) < 64) {
510                 (void) fprintf(stderr, "%s: %s\n", progname,
511                         _("wild compilation-time specification of zic_t"));
512                 exit(EXIT_FAILURE);
513         }
514         for (i = 1; i < argc; ++i)
515                 if (strcmp(argv[i], "--version") == 0) {
516                         (void) printf("%s\n", elsieid);
517                         exit(EXIT_SUCCESS);
518                 }
519         while ((c = getopt(argc, argv, "d:l:p:L:vsy:")) != EOF && c != -1)
520                 switch (c) {
521                         default:
522                                 usage();
523                         case 'd':
524                                 if (directory == NULL)
525                                         directory = optarg;
526                                 else {
527                                         (void) fprintf(stderr,
528 _("%s: More than one -d option specified\n"),
529                                                 progname);
530                                         exit(EXIT_FAILURE);
531                                 }
532                                 break;
533                         case 'l':
534                                 if (lcltime == NULL)
535                                         lcltime = optarg;
536                                 else {
537                                         (void) fprintf(stderr,
538 _("%s: More than one -l option specified\n"),
539                                                 progname);
540                                         exit(EXIT_FAILURE);
541                                 }
542                                 break;
543                         case 'p':
544                                 if (psxrules == NULL)
545                                         psxrules = optarg;
546                                 else {
547                                         (void) fprintf(stderr,
548 _("%s: More than one -p option specified\n"),
549                                                 progname);
550                                         exit(EXIT_FAILURE);
551                                 }
552                                 break;
553                         case 'y':
554                                 if (yitcommand == NULL)
555                                         yitcommand = optarg;
556                                 else {
557                                         (void) fprintf(stderr,
558 _("%s: More than one -y option specified\n"),
559                                                 progname);
560                                         exit(EXIT_FAILURE);
561                                 }
562                                 break;
563                         case 'L':
564                                 if (leapsec == NULL)
565                                         leapsec = optarg;
566                                 else {
567                                         (void) fprintf(stderr,
568 _("%s: More than one -L option specified\n"),
569                                                 progname);
570                                         exit(EXIT_FAILURE);
571                                 }
572                                 break;
573                         case 'v':
574                                 noise = TRUE;
575                                 break;
576                         case 's':
577                                 (void) printf("%s: -s ignored\n", progname);
578                                 break;
579                 }
580         if (optind == argc - 1 && strcmp(argv[optind], "=") == 0)
581                 usage();        /* usage message by request */
582         if (directory == NULL)
583                 directory = TZDIR;
584         if (yitcommand == NULL)
585                 yitcommand = "yearistype";
586
587         setboundaries();
588
589         if (optind < argc && leapsec != NULL) {
590                 infile(leapsec);
591                 adjleap();
592         }
593
594         for (i = optind; i < argc; ++i)
595                 infile(argv[i]);
596         if (errors)
597                 exit(EXIT_FAILURE);
598         associate();
599         for (i = 0; i < nzones; i = j) {
600                 /*
601                 ** Find the next non-continuation zone entry.
602                 */
603                 for (j = i + 1; j < nzones && zones[j].z_name == NULL; ++j)
604                         continue;
605                 outzone(&zones[i], j - i);
606         }
607         /*
608         ** Make links.
609         */
610         for (i = 0; i < nlinks; ++i) {
611                 eat(links[i].l_filename, links[i].l_linenum);
612                 dolink(links[i].l_from, links[i].l_to);
613                 if (noise)
614                         for (j = 0; j < nlinks; ++j)
615                                 if (strcmp(links[i].l_to,
616                                         links[j].l_from) == 0)
617                                                 warning(_("link to link"));
618         }
619         if (lcltime != NULL) {
620                 eat("command line", 1);
621                 dolink(lcltime, TZDEFAULT);
622         }
623         if (psxrules != NULL) {
624                 eat("command line", 1);
625                 dolink(psxrules, TZDEFRULES);
626         }
627         return (errors == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
628 }
629
630 static void
631 dolink(fromfile, tofile)
632 const char * const      fromfile;
633 const char * const      tofile;
634 {
635         register char * fromname;
636         register char * toname;
637
638         if (fromfile[0] == '/')
639                 fromname = ecpyalloc(fromfile);
640         else {
641                 fromname = ecpyalloc(directory);
642                 fromname = ecatalloc(fromname, "/");
643                 fromname = ecatalloc(fromname, fromfile);
644         }
645         if (tofile[0] == '/')
646                 toname = ecpyalloc(tofile);
647         else {
648                 toname = ecpyalloc(directory);
649                 toname = ecatalloc(toname, "/");
650                 toname = ecatalloc(toname, tofile);
651         }
652         /*
653         ** We get to be careful here since
654         ** there's a fair chance of root running us.
655         */
656         if (!itsdir(toname))
657                 (void) remove(toname);
658         if (link(fromname, toname) != 0) {
659                 int     result;
660
661                 if (mkdirs(toname) != 0)
662                         exit(EXIT_FAILURE);
663
664                 result = link(fromname, toname);
665 #if HAVE_SYMLINK
666                 if (result != 0 &&
667                         access(fromname, F_OK) == 0 &&
668                         !itsdir(fromname)) {
669                                 const char *s = tofile;
670                                 register char * symlinkcontents = NULL;
671
672                                 while ((s = strchr(s+1, '/')) != NULL)
673                                         symlinkcontents =
674                                                 ecatalloc(symlinkcontents,
675                                                 "../");
676                                 symlinkcontents =
677                                         ecatalloc(symlinkcontents,
678                                         fromname);
679                                 result = symlink(symlinkcontents,
680                                         toname);
681                                 if (result == 0)
682 warning(_("hard link failed, symbolic link used"));
683                                 ifree(symlinkcontents);
684                 }
685 #endif /* HAVE_SYMLINK */
686                 if (result != 0) {
687                         const char *e = strerror(errno);
688
689                         (void) fprintf(stderr,
690                                 _("%s: Can't link from %s to %s: %s\n"),
691                                 progname, fromname, toname, e);
692                         exit(EXIT_FAILURE);
693                 }
694         }
695         ifree(fromname);
696         ifree(toname);
697 }
698
699 #define TIME_T_BITS_IN_FILE     64
700
701 static void
702 setboundaries P((void))
703 {
704         register int    i;
705
706         min_time = -1;
707         for (i = 0; i < TIME_T_BITS_IN_FILE - 1; ++i)
708                 min_time *= 2;
709         max_time = -(min_time + 1);
710 }
711
712 static int
713 itsdir(name)
714 const char * const      name;
715 {
716         register char * myname;
717         register int    accres;
718
719         myname = ecpyalloc(name);
720         myname = ecatalloc(myname, "/.");
721         accres = access(myname, F_OK);
722         ifree(myname);
723         return accres == 0;
724 }
725
726 /*
727 ** Associate sets of rules with zones.
728 */
729
730 /*
731 ** Sort by rule name.
732 */
733
734 static int
735 rcomp(cp1, cp2)
736 const void *    cp1;
737 const void *    cp2;
738 {
739         return strcmp(((const struct rule *) cp1)->r_name,
740                 ((const struct rule *) cp2)->r_name);
741 }
742
743 static void
744 associate P((void))
745 {
746         register struct zone *  zp;
747         register struct rule *  rp;
748         register int            base, out;
749         register int            i, j;
750
751         if (nrules != 0) {
752                 (void) qsort((void *) rules, (size_t) nrules,
753                         (size_t) sizeof *rules, rcomp);
754                 for (i = 0; i < nrules - 1; ++i) {
755                         if (strcmp(rules[i].r_name,
756                                 rules[i + 1].r_name) != 0)
757                                         continue;
758                         if (strcmp(rules[i].r_filename,
759                                 rules[i + 1].r_filename) == 0)
760                                         continue;
761                         eat(rules[i].r_filename, rules[i].r_linenum);
762                         warning(_("same rule name in multiple files"));
763                         eat(rules[i + 1].r_filename, rules[i + 1].r_linenum);
764                         warning(_("same rule name in multiple files"));
765                         for (j = i + 2; j < nrules; ++j) {
766                                 if (strcmp(rules[i].r_name,
767                                         rules[j].r_name) != 0)
768                                                 break;
769                                 if (strcmp(rules[i].r_filename,
770                                         rules[j].r_filename) == 0)
771                                                 continue;
772                                 if (strcmp(rules[i + 1].r_filename,
773                                         rules[j].r_filename) == 0)
774                                                 continue;
775                                 break;
776                         }
777                         i = j - 1;
778                 }
779         }
780         for (i = 0; i < nzones; ++i) {
781                 zp = &zones[i];
782                 zp->z_rules = NULL;
783                 zp->z_nrules = 0;
784         }
785         for (base = 0; base < nrules; base = out) {
786                 rp = &rules[base];
787                 for (out = base + 1; out < nrules; ++out)
788                         if (strcmp(rp->r_name, rules[out].r_name) != 0)
789                                 break;
790                 for (i = 0; i < nzones; ++i) {
791                         zp = &zones[i];
792                         if (strcmp(zp->z_rule, rp->r_name) != 0)
793                                 continue;
794                         zp->z_rules = rp;
795                         zp->z_nrules = out - base;
796                 }
797         }
798         for (i = 0; i < nzones; ++i) {
799                 zp = &zones[i];
800                 if (zp->z_nrules == 0) {
801                         /*
802                         ** Maybe we have a local standard time offset.
803                         */
804                         eat(zp->z_filename, zp->z_linenum);
805                         zp->z_stdoff = gethms(zp->z_rule, _("unruly zone"),
806                                 TRUE);
807                         /*
808                         ** Note, though, that if there's no rule,
809                         ** a '%s' in the format is a bad thing.
810                         */
811                         if (strchr(zp->z_format, '%') != 0)
812                                 error(_("%s in ruleless zone"));
813                 }
814         }
815         if (errors)
816                 exit(EXIT_FAILURE);
817 }
818
819 static void
820 infile(name)
821 const char *    name;
822 {
823         register FILE *                 fp;
824         register char **                fields;
825         register char *                 cp;
826         register const struct lookup *  lp;
827         register int                    nfields;
828         register int                    wantcont;
829         register int                    num;
830         char                            buf[BUFSIZ];
831
832         if (strcmp(name, "-") == 0) {
833                 name = _("standard input");
834                 fp = stdin;
835         } else if ((fp = fopen(name, "r")) == NULL) {
836                 const char *e = strerror(errno);
837
838                 (void) fprintf(stderr, _("%s: Can't open %s: %s\n"),
839                         progname, name, e);
840                 exit(EXIT_FAILURE);
841         }
842         wantcont = FALSE;
843         for (num = 1; ; ++num) {
844                 eat(name, num);
845                 if (fgets(buf, (int) sizeof buf, fp) != buf)
846                         break;
847                 cp = strchr(buf, '\n');
848                 if (cp == NULL) {
849                         error(_("line too long"));
850                         exit(EXIT_FAILURE);
851                 }
852                 *cp = '\0';
853                 fields = getfields(buf);
854                 nfields = 0;
855                 while (fields[nfields] != NULL) {
856                         static char     nada;
857
858                         if (strcmp(fields[nfields], "-") == 0)
859                                 fields[nfields] = &nada;
860                         ++nfields;
861                 }
862                 if (nfields == 0) {
863                         /* nothing to do */
864                 } else if (wantcont) {
865                         wantcont = inzcont(fields, nfields);
866                 } else {
867                         lp = byword(fields[0], line_codes);
868                         if (lp == NULL)
869                                 error(_("input line of unknown type"));
870                         else switch ((int) (lp->l_value)) {
871                                 case LC_RULE:
872                                         inrule(fields, nfields);
873                                         wantcont = FALSE;
874                                         break;
875                                 case LC_ZONE:
876                                         wantcont = inzone(fields, nfields);
877                                         break;
878                                 case LC_LINK:
879                                         inlink(fields, nfields);
880                                         wantcont = FALSE;
881                                         break;
882                                 case LC_LEAP:
883                                         if (name != leapsec)
884                                                 (void) fprintf(stderr,
885 _("%s: Leap line in non leap seconds file %s\n"),
886                                                         progname, name);
887                                         else    inleap(fields, nfields);
888                                         wantcont = FALSE;
889                                         break;
890                                 default:        /* "cannot happen" */
891                                         (void) fprintf(stderr,
892 _("%s: panic: Invalid l_value %d\n"),
893                                                 progname, lp->l_value);
894                                         exit(EXIT_FAILURE);
895                         }
896                 }
897                 ifree((char *) fields);
898         }
899         if (ferror(fp)) {
900                 (void) fprintf(stderr, _("%s: Error reading %s\n"),
901                         progname, filename);
902                 exit(EXIT_FAILURE);
903         }
904         if (fp != stdin && fclose(fp)) {
905                 const char *e = strerror(errno);
906
907                 (void) fprintf(stderr, _("%s: Error closing %s: %s\n"),
908                         progname, filename, e);
909                 exit(EXIT_FAILURE);
910         }
911         if (wantcont)
912                 error(_("expected continuation line not found"));
913 }
914
915 /*
916 ** Convert a string of one of the forms
917 **      h       -h      hh:mm   -hh:mm  hh:mm:ss        -hh:mm:ss
918 ** into a number of seconds.
919 ** A null string maps to zero.
920 ** Call error with errstring and return zero on errors.
921 */
922
923 static long
924 gethms(string, errstring, signable)
925 const char *            string;
926 const char * const      errstring;
927 const int               signable;
928 {
929         int     hh, mm, ss, sign;
930
931         if (string == NULL || *string == '\0')
932                 return 0;
933         if (!signable)
934                 sign = 1;
935         else if (*string == '-') {
936                 sign = -1;
937                 ++string;
938         } else  sign = 1;
939         if (sscanf(string, scheck(string, "%d"), &hh) == 1)
940                 mm = ss = 0;
941         else if (sscanf(string, scheck(string, "%d:%d"), &hh, &mm) == 2)
942                 ss = 0;
943         else if (sscanf(string, scheck(string, "%d:%d:%d"),
944                 &hh, &mm, &ss) != 3) {
945                         error(errstring);
946                         return 0;
947         }
948         if ((hh < 0 || hh >= HOURSPERDAY ||
949                 mm < 0 || mm >= MINSPERHOUR ||
950                 ss < 0 || ss > SECSPERMIN) &&
951                 !(hh == HOURSPERDAY && mm == 0 && ss == 0)) {
952                         error(errstring);
953                         return 0;
954         }
955         if (noise && hh == HOURSPERDAY)
956                 warning(_("24:00 not handled by pre-1998 versions of zic"));
957         return eitol(sign) *
958                 (eitol(hh * MINSPERHOUR + mm) *
959                 eitol(SECSPERMIN) + eitol(ss));
960 }
961
962 static void
963 inrule(fields, nfields)
964 register char ** const  fields;
965 const int               nfields;
966 {
967         static struct rule      r;
968
969         if (nfields != RULE_FIELDS) {
970                 error(_("wrong number of fields on Rule line"));
971                 return;
972         }
973         if (*fields[RF_NAME] == '\0') {
974                 error(_("nameless rule"));
975                 return;
976         }
977         r.r_filename = filename;
978         r.r_linenum = linenum;
979         r.r_stdoff = gethms(fields[RF_STDOFF], _("invalid saved time"), TRUE);
980         rulesub(&r, fields[RF_LOYEAR], fields[RF_HIYEAR], fields[RF_COMMAND],
981                 fields[RF_MONTH], fields[RF_DAY], fields[RF_TOD]);
982         r.r_name = ecpyalloc(fields[RF_NAME]);
983         r.r_abbrvar = ecpyalloc(fields[RF_ABBRVAR]);
984         if (max_abbrvar_len < strlen(r.r_abbrvar))
985                 max_abbrvar_len = strlen(r.r_abbrvar);
986         rules = (struct rule *) (void *) erealloc((char *) rules,
987                 (int) ((nrules + 1) * sizeof *rules));
988         rules[nrules++] = r;
989 }
990
991 static int
992 inzone(fields, nfields)
993 register char ** const  fields;
994 const int               nfields;
995 {
996         register int    i;
997         static char *   buf;
998
999         if (nfields < ZONE_MINFIELDS || nfields > ZONE_MAXFIELDS) {
1000                 error(_("wrong number of fields on Zone line"));
1001                 return FALSE;
1002         }
1003         if (strcmp(fields[ZF_NAME], TZDEFAULT) == 0 && lcltime != NULL) {
1004                 buf = erealloc(buf, (int) (132 + strlen(TZDEFAULT)));
1005                 (void) sprintf(buf,
1006 _("\"Zone %s\" line and -l option are mutually exclusive"),
1007                         TZDEFAULT);
1008                 error(buf);
1009                 return FALSE;
1010         }
1011         if (strcmp(fields[ZF_NAME], TZDEFRULES) == 0 && psxrules != NULL) {
1012                 buf = erealloc(buf, (int) (132 + strlen(TZDEFRULES)));
1013                 (void) sprintf(buf,
1014 _("\"Zone %s\" line and -p option are mutually exclusive"),
1015                         TZDEFRULES);
1016                 error(buf);
1017                 return FALSE;
1018         }
1019         for (i = 0; i < nzones; ++i)
1020                 if (zones[i].z_name != NULL &&
1021                         strcmp(zones[i].z_name, fields[ZF_NAME]) == 0) {
1022                                 buf = erealloc(buf, (int) (132 +
1023                                         strlen(fields[ZF_NAME]) +
1024                                         strlen(zones[i].z_filename)));
1025                                 (void) sprintf(buf,
1026 _("duplicate zone name %s (file \"%s\", line %d)"),
1027                                         fields[ZF_NAME],
1028                                         zones[i].z_filename,
1029                                         zones[i].z_linenum);
1030                                 error(buf);
1031                                 return FALSE;
1032                 }
1033         return inzsub(fields, nfields, FALSE);
1034 }
1035
1036 static int
1037 inzcont(fields, nfields)
1038 register char ** const  fields;
1039 const int               nfields;
1040 {
1041         if (nfields < ZONEC_MINFIELDS || nfields > ZONEC_MAXFIELDS) {
1042                 error(_("wrong number of fields on Zone continuation line"));
1043                 return FALSE;
1044         }
1045         return inzsub(fields, nfields, TRUE);
1046 }
1047
1048 static int
1049 inzsub(fields, nfields, iscont)
1050 register char ** const  fields;
1051 const int               nfields;
1052 const int               iscont;
1053 {
1054         register char *         cp;
1055         static struct zone      z;
1056         register int            i_gmtoff, i_rule, i_format;
1057         register int            i_untilyear, i_untilmonth;
1058         register int            i_untilday, i_untiltime;
1059         register int            hasuntil;
1060
1061         if (iscont) {
1062                 i_gmtoff = ZFC_GMTOFF;
1063                 i_rule = ZFC_RULE;
1064                 i_format = ZFC_FORMAT;
1065                 i_untilyear = ZFC_TILYEAR;
1066                 i_untilmonth = ZFC_TILMONTH;
1067                 i_untilday = ZFC_TILDAY;
1068                 i_untiltime = ZFC_TILTIME;
1069                 z.z_name = NULL;
1070         } else {
1071                 i_gmtoff = ZF_GMTOFF;
1072                 i_rule = ZF_RULE;
1073                 i_format = ZF_FORMAT;
1074                 i_untilyear = ZF_TILYEAR;
1075                 i_untilmonth = ZF_TILMONTH;
1076                 i_untilday = ZF_TILDAY;
1077                 i_untiltime = ZF_TILTIME;
1078                 z.z_name = ecpyalloc(fields[ZF_NAME]);
1079         }
1080         z.z_filename = filename;
1081         z.z_linenum = linenum;
1082         z.z_gmtoff = gethms(fields[i_gmtoff], _("invalid UTC offset"), TRUE);
1083         if ((cp = strchr(fields[i_format], '%')) != 0) {
1084                 if (*++cp != 's' || strchr(cp, '%') != 0) {
1085                         error(_("invalid abbreviation format"));
1086                         return FALSE;
1087                 }
1088         }
1089         z.z_rule = ecpyalloc(fields[i_rule]);
1090         z.z_format = ecpyalloc(fields[i_format]);
1091         if (max_format_len < strlen(z.z_format))
1092                 max_format_len = strlen(z.z_format);
1093         hasuntil = nfields > i_untilyear;
1094         if (hasuntil) {
1095                 z.z_untilrule.r_filename = filename;
1096                 z.z_untilrule.r_linenum = linenum;
1097                 rulesub(&z.z_untilrule,
1098                         fields[i_untilyear],
1099                         "only",
1100                         "",
1101                         (nfields > i_untilmonth) ?
1102                         fields[i_untilmonth] : "Jan",
1103                         (nfields > i_untilday) ? fields[i_untilday] : "1",
1104                         (nfields > i_untiltime) ? fields[i_untiltime] : "0");
1105                 z.z_untiltime = rpytime(&z.z_untilrule,
1106                         z.z_untilrule.r_loyear);
1107                 if (iscont && nzones > 0 &&
1108                         z.z_untiltime > min_time &&
1109                         z.z_untiltime < max_time &&
1110                         zones[nzones - 1].z_untiltime > min_time &&
1111                         zones[nzones - 1].z_untiltime < max_time &&
1112                         zones[nzones - 1].z_untiltime >= z.z_untiltime) {
1113                                 error(_(
1114 "Zone continuation line end time is not after end time of previous line"
1115                                         ));
1116                                 return FALSE;
1117                 }
1118         }
1119         zones = (struct zone *) (void *) erealloc((char *) zones,
1120                 (int) ((nzones + 1) * sizeof *zones));
1121         zones[nzones++] = z;
1122         /*
1123         ** If there was an UNTIL field on this line,
1124         ** there's more information about the zone on the next line.
1125         */
1126         return hasuntil;
1127 }
1128
1129 static void
1130 inleap(fields, nfields)
1131 register char ** const  fields;
1132 const int               nfields;
1133 {
1134         register const char *           cp;
1135         register const struct lookup *  lp;
1136         register int                    i, j;
1137         int                             year, month, day;
1138         long                            dayoff, tod;
1139         zic_t                           t;
1140
1141         if (nfields != LEAP_FIELDS) {
1142                 error(_("wrong number of fields on Leap line"));
1143                 return;
1144         }
1145         dayoff = 0;
1146         cp = fields[LP_YEAR];
1147         if (sscanf(cp, scheck(cp, "%d"), &year) != 1) {
1148                 /*
1149                 ** Leapin' Lizards!
1150                 */
1151                 error(_("invalid leaping year"));
1152                 return;
1153         }
1154         if (!leapseen || leapmaxyear < year)
1155                 leapmaxyear = year;
1156         if (!leapseen || leapminyear > year)
1157                 leapminyear = year;
1158         leapseen = TRUE;
1159         j = EPOCH_YEAR;
1160         while (j != year) {
1161                 if (year > j) {
1162                         i = len_years[isleap(j)];
1163                         ++j;
1164                 } else {
1165                         --j;
1166                         i = -len_years[isleap(j)];
1167                 }
1168                 dayoff = oadd(dayoff, eitol(i));
1169         }
1170         if ((lp = byword(fields[LP_MONTH], mon_names)) == NULL) {
1171                 error(_("invalid month name"));
1172                 return;
1173         }
1174         month = lp->l_value;
1175         j = TM_JANUARY;
1176         while (j != month) {
1177                 i = len_months[isleap(year)][j];
1178                 dayoff = oadd(dayoff, eitol(i));
1179                 ++j;
1180         }
1181         cp = fields[LP_DAY];
1182         if (sscanf(cp, scheck(cp, "%d"), &day) != 1 ||
1183                 day <= 0 || day > len_months[isleap(year)][month]) {
1184                         error(_("invalid day of month"));
1185                         return;
1186         }
1187         dayoff = oadd(dayoff, eitol(day - 1));
1188         if (dayoff < 0 && !TYPE_SIGNED(zic_t)) {
1189                 error(_("time before zero"));
1190                 return;
1191         }
1192         if (dayoff < min_time / SECSPERDAY) {
1193                 error(_("time too small"));
1194                 return;
1195         }
1196         if (dayoff > max_time / SECSPERDAY) {
1197                 error(_("time too large"));
1198                 return;
1199         }
1200         t = (zic_t) dayoff * SECSPERDAY;
1201         tod = gethms(fields[LP_TIME], _("invalid time of day"), FALSE);
1202         cp = fields[LP_CORR];
1203         {
1204                 register int    positive;
1205                 int             count;
1206
1207                 if (strcmp(cp, "") == 0) { /* infile() turns "-" into "" */
1208                         positive = FALSE;
1209                         count = 1;
1210                 } else if (strcmp(cp, "--") == 0) {
1211                         positive = FALSE;
1212                         count = 2;
1213                 } else if (strcmp(cp, "+") == 0) {
1214                         positive = TRUE;
1215                         count = 1;
1216                 } else if (strcmp(cp, "++") == 0) {
1217                         positive = TRUE;
1218                         count = 2;
1219                 } else {
1220                         error(_("illegal CORRECTION field on Leap line"));
1221                         return;
1222                 }
1223                 if ((lp = byword(fields[LP_ROLL], leap_types)) == NULL) {
1224                         error(_(
1225                                 "illegal Rolling/Stationary field on Leap line"
1226                                 ));
1227                         return;
1228                 }
1229                 leapadd(tadd(t, tod), positive, lp->l_value, count);
1230         }
1231 }
1232
1233 static void
1234 inlink(fields, nfields)
1235 register char ** const  fields;
1236 const int               nfields;
1237 {
1238         struct link     l;
1239
1240         if (nfields != LINK_FIELDS) {
1241                 error(_("wrong number of fields on Link line"));
1242                 return;
1243         }
1244         if (*fields[LF_FROM] == '\0') {
1245                 error(_("blank FROM field on Link line"));
1246                 return;
1247         }
1248         if (*fields[LF_TO] == '\0') {
1249                 error(_("blank TO field on Link line"));
1250                 return;
1251         }
1252         l.l_filename = filename;
1253         l.l_linenum = linenum;
1254         l.l_from = ecpyalloc(fields[LF_FROM]);
1255         l.l_to = ecpyalloc(fields[LF_TO]);
1256         links = (struct link *) (void *) erealloc((char *) links,
1257                 (int) ((nlinks + 1) * sizeof *links));
1258         links[nlinks++] = l;
1259 }
1260
1261 static void
1262 rulesub(rp, loyearp, hiyearp, typep, monthp, dayp, timep)
1263 register struct rule * const    rp;
1264 const char * const              loyearp;
1265 const char * const              hiyearp;
1266 const char * const              typep;
1267 const char * const              monthp;
1268 const char * const              dayp;
1269 const char * const              timep;
1270 {
1271         register const struct lookup *  lp;
1272         register const char *           cp;
1273         register char *                 dp;
1274         register char *                 ep;
1275
1276         if ((lp = byword(monthp, mon_names)) == NULL) {
1277                 error(_("invalid month name"));
1278                 return;
1279         }
1280         rp->r_month = lp->l_value;
1281         rp->r_todisstd = FALSE;
1282         rp->r_todisgmt = FALSE;
1283         dp = ecpyalloc(timep);
1284         if (*dp != '\0') {
1285                 ep = dp + strlen(dp) - 1;
1286                 switch (lowerit(*ep)) {
1287                         case 's':       /* Standard */
1288                                 rp->r_todisstd = TRUE;
1289                                 rp->r_todisgmt = FALSE;
1290                                 *ep = '\0';
1291                                 break;
1292                         case 'w':       /* Wall */
1293                                 rp->r_todisstd = FALSE;
1294                                 rp->r_todisgmt = FALSE;
1295                                 *ep = '\0';
1296                                 break;
1297                         case 'g':       /* Greenwich */
1298                         case 'u':       /* Universal */
1299                         case 'z':       /* Zulu */
1300                                 rp->r_todisstd = TRUE;
1301                                 rp->r_todisgmt = TRUE;
1302                                 *ep = '\0';
1303                                 break;
1304                 }
1305         }
1306         rp->r_tod = gethms(dp, _("invalid time of day"), FALSE);
1307         ifree(dp);
1308         /*
1309         ** Year work.
1310         */
1311         cp = loyearp;
1312         lp = byword(cp, begin_years);
1313         rp->r_lowasnum = lp == NULL;
1314         if (!rp->r_lowasnum) switch ((int) lp->l_value) {
1315                 case YR_MINIMUM:
1316                         rp->r_loyear = INT_MIN;
1317                         break;
1318                 case YR_MAXIMUM:
1319                         rp->r_loyear = INT_MAX;
1320                         break;
1321                 default:        /* "cannot happen" */
1322                         (void) fprintf(stderr,
1323                                 _("%s: panic: Invalid l_value %d\n"),
1324                                 progname, lp->l_value);
1325                         exit(EXIT_FAILURE);
1326         } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_loyear) != 1) {
1327                 error(_("invalid starting year"));
1328                 return;
1329         }
1330         cp = hiyearp;
1331         lp = byword(cp, end_years);
1332         rp->r_hiwasnum = lp == NULL;
1333         if (!rp->r_hiwasnum) switch ((int) lp->l_value) {
1334                 case YR_MINIMUM:
1335                         rp->r_hiyear = INT_MIN;
1336                         break;
1337                 case YR_MAXIMUM:
1338                         rp->r_hiyear = INT_MAX;
1339                         break;
1340                 case YR_ONLY:
1341                         rp->r_hiyear = rp->r_loyear;
1342                         break;
1343                 default:        /* "cannot happen" */
1344                         (void) fprintf(stderr,
1345                                 _("%s: panic: Invalid l_value %d\n"),
1346                                 progname, lp->l_value);
1347                         exit(EXIT_FAILURE);
1348         } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_hiyear) != 1) {
1349                 error(_("invalid ending year"));
1350                 return;
1351         }
1352         if (rp->r_loyear > rp->r_hiyear) {
1353                 error(_("starting year greater than ending year"));
1354                 return;
1355         }
1356         if (*typep == '\0')
1357                 rp->r_yrtype = NULL;
1358         else {
1359                 if (rp->r_loyear == rp->r_hiyear) {
1360                         error(_("typed single year"));
1361                         return;
1362                 }
1363                 rp->r_yrtype = ecpyalloc(typep);
1364         }
1365         /*
1366         ** Day work.
1367         ** Accept things such as:
1368         **      1
1369         **      last-Sunday
1370         **      Sun<=20
1371         **      Sun>=7
1372         */
1373         dp = ecpyalloc(dayp);
1374         if ((lp = byword(dp, lasts)) != NULL) {
1375                 rp->r_dycode = DC_DOWLEQ;
1376                 rp->r_wday = lp->l_value;
1377                 rp->r_dayofmonth = len_months[1][rp->r_month];
1378         } else {
1379                 if ((ep = strchr(dp, '<')) != 0)
1380                         rp->r_dycode = DC_DOWLEQ;
1381                 else if ((ep = strchr(dp, '>')) != 0)
1382                         rp->r_dycode = DC_DOWGEQ;
1383                 else {
1384                         ep = dp;
1385                         rp->r_dycode = DC_DOM;
1386                 }
1387                 if (rp->r_dycode != DC_DOM) {
1388                         *ep++ = 0;
1389                         if (*ep++ != '=') {
1390                                 error(_("invalid day of month"));
1391                                 ifree(dp);
1392                                 return;
1393                         }
1394                         if ((lp = byword(dp, wday_names)) == NULL) {
1395                                 error(_("invalid weekday name"));
1396                                 ifree(dp);
1397                                 return;
1398                         }
1399                         rp->r_wday = lp->l_value;
1400                 }
1401                 if (sscanf(ep, scheck(ep, "%d"), &rp->r_dayofmonth) != 1 ||
1402                         rp->r_dayofmonth <= 0 ||
1403                         (rp->r_dayofmonth > len_months[1][rp->r_month])) {
1404                                 error(_("invalid day of month"));
1405                                 ifree(dp);
1406                                 return;
1407                 }
1408         }
1409         ifree(dp);
1410 }
1411
1412 static void
1413 convert(val, buf)
1414 const long      val;
1415 char * const    buf;
1416 {
1417         register int    i;
1418         register int    shift;
1419
1420         for (i = 0, shift = 24; i < 4; ++i, shift -= 8)
1421                 buf[i] = val >> shift;
1422 }
1423
1424 static void
1425 convert64(val, buf)
1426 const zic_t     val;
1427 char * const    buf;
1428 {
1429         register int    i;
1430         register int    shift;
1431
1432         for (i = 0, shift = 56; i < 8; ++i, shift -= 8)
1433                 buf[i] = val >> shift;
1434 }
1435
1436 static void
1437 puttzcode(val, fp)
1438 const long      val;
1439 FILE * const    fp;
1440 {
1441         char    buf[4];
1442
1443         convert(val, buf);
1444         (void) fwrite((void *) buf, (size_t) sizeof buf, (size_t) 1, fp);
1445 }
1446
1447 static void
1448 puttzcode64(val, fp)
1449 const zic_t     val;
1450 FILE * const    fp;
1451 {
1452         char    buf[8];
1453
1454         convert64(val, buf);
1455         (void) fwrite((void *) buf, (size_t) sizeof buf, (size_t) 1, fp);
1456 }
1457
1458 static int
1459 atcomp(avp, bvp)
1460 const void *    avp;
1461 const void *    bvp;
1462 {
1463         const zic_t     a = ((const struct attype *) avp)->at;
1464         const zic_t     b = ((const struct attype *) bvp)->at;
1465
1466         return (a < b) ? -1 : (a > b);
1467 }
1468
1469 static int
1470 is32(x)
1471 const zic_t     x;
1472 {
1473         return INT32_MIN <= x && x <= INT32_MAX;
1474 }
1475
1476 static void
1477 writezone(name, string)
1478 const char * const      name;
1479 const char * const      string;
1480 {
1481         register FILE *                 fp;
1482         register int                    i, j;
1483         register int                    leapcnt32, leapi32;
1484         register int                    timecnt32, timei32;
1485         register int                    pass;
1486         static char *                   fullname;
1487         static const struct tzhead      tzh0;
1488         static struct tzhead            tzh;
1489         zic_t                           ats[TZ_MAX_TIMES];
1490         unsigned char                   types[TZ_MAX_TIMES];
1491
1492         /*
1493         ** Sort.
1494         */
1495         if (timecnt > 1)
1496                 (void) qsort((void *) attypes, (size_t) timecnt,
1497                         (size_t) sizeof *attypes, atcomp);
1498         /*
1499         ** Optimize.
1500         */
1501         {
1502                 int     fromi;
1503                 int     toi;
1504
1505                 toi = 0;
1506                 fromi = 0;
1507                 while (fromi < timecnt && attypes[fromi].at < min_time)
1508                         ++fromi;
1509                 if (isdsts[0] == 0)
1510                         while (fromi < timecnt && attypes[fromi].type == 0)
1511                                 ++fromi;        /* handled by default rule */
1512                 for ( ; fromi < timecnt; ++fromi) {
1513                         if (toi != 0 && ((attypes[fromi].at +
1514                                 gmtoffs[attypes[toi - 1].type]) <=
1515                                 (attypes[toi - 1].at + gmtoffs[toi == 1 ? 0
1516                                 : attypes[toi - 2].type]))) {
1517                                         attypes[toi - 1].type =
1518                                                 attypes[fromi].type;
1519                                         continue;
1520                         }
1521                         if (toi == 0 ||
1522                                 attypes[toi - 1].type != attypes[fromi].type)
1523                                         attypes[toi++] = attypes[fromi];
1524                 }
1525                 timecnt = toi;
1526         }
1527         /*
1528         ** Transfer.
1529         */
1530         for (i = 0; i < timecnt; ++i) {
1531                 ats[i] = attypes[i].at;
1532                 types[i] = attypes[i].type;
1533         }
1534         /*
1535         ** Correct for leap seconds.
1536         */
1537         for (i = 0; i < timecnt; ++i) {
1538                 j = leapcnt;
1539                 while (--j >= 0)
1540                         if (ats[i] > trans[j] - corr[j]) {
1541                                 ats[i] = tadd(ats[i], corr[j]);
1542                                 break;
1543                         }
1544         }
1545         /*
1546         ** Figure out 32-bit-limited starts and counts.
1547         */
1548         timecnt32 = timecnt;
1549         timei32 = 0;
1550         leapcnt32 = leapcnt;
1551         leapi32 = 0;
1552         while (timecnt32 > 0 && !is32(ats[timecnt32 - 1]))
1553                 --timecnt32;
1554         while (timecnt32 > 0 && !is32(ats[timei32])) {
1555                 --timecnt32;
1556                 ++timei32;
1557         }
1558         while (leapcnt32 > 0 && !is32(trans[leapcnt32 - 1]))
1559                 --leapcnt32;
1560         while (leapcnt32 > 0 && !is32(trans[leapi32])) {
1561                 --leapcnt32;
1562                 ++leapi32;
1563         }
1564         fullname = erealloc(fullname,
1565                 (int) (strlen(directory) + 1 + strlen(name) + 1));
1566         (void) sprintf(fullname, "%s/%s", directory, name);
1567         /*
1568         ** Remove old file, if any, to snap links.
1569         */
1570         if (!itsdir(fullname) && remove(fullname) != 0 && errno != ENOENT) {
1571                 const char *e = strerror(errno);
1572
1573                 (void) fprintf(stderr, _("%s: Can't remove %s: %s\n"),
1574                         progname, fullname, e);
1575                 exit(EXIT_FAILURE);
1576         }
1577         if ((fp = fopen(fullname, "wb")) == NULL) {
1578                 if (mkdirs(fullname) != 0)
1579                         exit(EXIT_FAILURE);
1580                 if ((fp = fopen(fullname, "wb")) == NULL) {
1581                         const char *e = strerror(errno);
1582
1583                         (void) fprintf(stderr, _("%s: Can't create %s: %s\n"),
1584                                 progname, fullname, e);
1585                         exit(EXIT_FAILURE);
1586                 }
1587         }
1588         for (pass = 1; pass <= 2; ++pass) {
1589                 register int    thistimei, thistimecnt;
1590                 register int    thisleapi, thisleapcnt;
1591                 register int    thistimelim, thisleaplim;
1592                 int             writetype[TZ_MAX_TIMES];
1593                 int             typemap[TZ_MAX_TYPES];
1594                 register int    thistypecnt;
1595                 char            thischars[TZ_MAX_CHARS];
1596                 char            thischarcnt;
1597                 int             indmap[TZ_MAX_CHARS];
1598
1599                 if (pass == 1) {
1600                         thistimei = timei32;
1601                         thistimecnt = timecnt32;
1602                         thisleapi = leapi32;
1603                         thisleapcnt = leapcnt32;
1604                 } else {
1605                         thistimei = 0;
1606                         thistimecnt = timecnt;
1607                         thisleapi = 0;
1608                         thisleapcnt = leapcnt;
1609                 }
1610                 thistimelim = thistimei + thistimecnt;
1611                 thisleaplim = thisleapi + thisleapcnt;
1612                 for (i = 0; i < typecnt; ++i)
1613                         writetype[i] = thistimecnt == timecnt;
1614                 if (thistimecnt == 0) {
1615                         /*
1616                         ** No transition times fall in the current
1617                         ** (32- or 64-bit) window.
1618                         */
1619                         if (typecnt != 0)
1620                                 writetype[typecnt - 1] = TRUE;
1621                 } else {
1622                         for (i = thistimei - 1; i < thistimelim; ++i)
1623                                 if (i >= 0)
1624                                         writetype[types[i]] = TRUE;
1625                         /*
1626                         ** For America/Godthab and Antarctica/Palmer
1627                         */
1628                         if (thistimei == 0)
1629                                 writetype[0] = TRUE;
1630                 }
1631                 thistypecnt = 0;
1632                 for (i = 0; i < typecnt; ++i)
1633                         typemap[i] = writetype[i] ?  thistypecnt++ : -1;
1634                 for (i = 0; i < sizeof indmap / sizeof indmap[0]; ++i)
1635                         indmap[i] = -1;
1636                 thischarcnt = 0;
1637                 for (i = 0; i < typecnt; ++i) {
1638                         register char * thisabbr;
1639
1640                         if (!writetype[i])
1641                                 continue;
1642                         if (indmap[abbrinds[i]] >= 0)
1643                                 continue;
1644                         thisabbr = &chars[abbrinds[i]];
1645                         for (j = 0; j < thischarcnt; ++j)
1646                                 if (strcmp(&thischars[j], thisabbr) == 0)
1647                                         break;
1648                         if (j == thischarcnt) {
1649                                 (void) strcpy(&thischars[(int) thischarcnt],
1650                                         thisabbr);
1651                                 thischarcnt += strlen(thisabbr) + 1;
1652                         }
1653                         indmap[abbrinds[i]] = j;
1654                 }
1655 #define DO(field)       (void) fwrite((void *) tzh.field, \
1656                                 (size_t) sizeof tzh.field, (size_t) 1, fp)
1657                 tzh = tzh0;
1658                 (void) strncpy(tzh.tzh_magic, TZ_MAGIC, sizeof tzh.tzh_magic);
1659                 tzh.tzh_version[0] = ZIC_VERSION;
1660                 convert(eitol(thistypecnt), tzh.tzh_ttisgmtcnt);
1661                 convert(eitol(thistypecnt), tzh.tzh_ttisstdcnt);
1662                 convert(eitol(thisleapcnt), tzh.tzh_leapcnt);
1663                 convert(eitol(thistimecnt), tzh.tzh_timecnt);
1664                 convert(eitol(thistypecnt), tzh.tzh_typecnt);
1665                 convert(eitol(thischarcnt), tzh.tzh_charcnt);
1666                 DO(tzh_magic);
1667                 DO(tzh_version);
1668                 DO(tzh_reserved);
1669                 DO(tzh_ttisgmtcnt);
1670                 DO(tzh_ttisstdcnt);
1671                 DO(tzh_leapcnt);
1672                 DO(tzh_timecnt);
1673                 DO(tzh_typecnt);
1674                 DO(tzh_charcnt);
1675 #undef DO
1676                 for (i = thistimei; i < thistimelim; ++i)
1677                         if (pass == 1)
1678                                 puttzcode((long) ats[i], fp);
1679                         else    puttzcode64(ats[i], fp);
1680                 for (i = thistimei; i < thistimelim; ++i) {
1681                         unsigned char   uc;
1682
1683                         uc = typemap[types[i]];
1684                         (void) fwrite((void *) &uc,
1685                                 (size_t) sizeof uc,
1686                                 (size_t) 1,
1687                                 fp);
1688                 }
1689                 for (i = 0; i < typecnt; ++i)
1690                         if (writetype[i]) {
1691                                 puttzcode(gmtoffs[i], fp);
1692                                 (void) putc(isdsts[i], fp);
1693                                 (void) putc((unsigned char) indmap[abbrinds[i]], fp);
1694                         }
1695                 if (thischarcnt != 0)
1696                         (void) fwrite((void *) thischars,
1697                                 (size_t) sizeof thischars[0],
1698                                 (size_t) thischarcnt, fp);
1699                 for (i = thisleapi; i < thisleaplim; ++i) {
1700                         register zic_t  todo;
1701
1702                         if (roll[i]) {
1703                                 if (timecnt == 0 || trans[i] < ats[0]) {
1704                                         j = 0;
1705                                         while (isdsts[j])
1706                                                 if (++j >= typecnt) {
1707                                                         j = 0;
1708                                                         break;
1709                                                 }
1710                                 } else {
1711                                         j = 1;
1712                                         while (j < timecnt &&
1713                                                 trans[i] >= ats[j])
1714                                                         ++j;
1715                                         j = types[j - 1];
1716                                 }
1717                                 todo = tadd(trans[i], -gmtoffs[j]);
1718                         } else  todo = trans[i];
1719                         if (pass == 1)
1720                                 puttzcode((long) todo, fp);
1721                         else    puttzcode64(todo, fp);
1722                         puttzcode(corr[i], fp);
1723                 }
1724                 for (i = 0; i < typecnt; ++i)
1725                         if (writetype[i])
1726                                 (void) putc(ttisstds[i], fp);
1727                 for (i = 0; i < typecnt; ++i)
1728                         if (writetype[i])
1729                                 (void) putc(ttisgmts[i], fp);
1730         }
1731         (void) fprintf(fp, "\n%s\n", string);
1732         if (ferror(fp) || fclose(fp)) {
1733                 (void) fprintf(stderr, _("%s: Error writing %s\n"),
1734                         progname, fullname);
1735                 exit(EXIT_FAILURE);
1736         }
1737 }
1738
1739 static void
1740 doabbr(abbr, format, letters, isdst, doquotes)
1741 char * const            abbr;
1742 const char * const      format;
1743 const char * const      letters;
1744 const int               isdst;
1745 const int               doquotes;
1746 {
1747         register char * cp;
1748         register char * slashp;
1749         register int    len;
1750
1751         slashp = strchr(format, '/');
1752         if (slashp == NULL) {
1753                 if (letters == NULL)
1754                         (void) strcpy(abbr, format);
1755                 else    (void) sprintf(abbr, format, letters);
1756         } else if (isdst) {
1757                 (void) strcpy(abbr, slashp + 1);
1758         } else {
1759                 if (slashp > format)
1760                         (void) strncpy(abbr, format,
1761                                 (unsigned) (slashp - format));
1762                 abbr[slashp - format] = '\0';
1763         }
1764         if (!doquotes)
1765                 return;
1766         for (cp = abbr; *cp != '\0'; ++cp)
1767                 if (strchr("ABCDEFGHIJKLMNOPQRSTUVWXYZ", *cp) == NULL &&
1768                         strchr("abcdefghijklmnopqrstuvwxyz", *cp) == NULL)
1769                                 break;
1770         len = strlen(abbr);
1771         if (len > 0 && *cp == '\0')
1772                 return;
1773         abbr[len + 2] = '\0';
1774         abbr[len + 1] = '>';
1775         for ( ; len > 0; --len)
1776                 abbr[len] = abbr[len - 1];
1777         abbr[0] = '<';
1778 }
1779
1780 static void
1781 updateminmax(x)
1782 const int       x;
1783 {
1784         if (min_year > x)
1785                 min_year = x;
1786         if (max_year < x)
1787                 max_year = x;
1788 }
1789
1790 static int
1791 stringoffset(result, offset)
1792 char *  result;
1793 long    offset;
1794 {
1795         register int    hours;
1796         register int    minutes;
1797         register int    seconds;
1798
1799         result[0] = '\0';
1800         if (offset < 0) {
1801                 (void) strcpy(result, "-");
1802                 offset = -offset;
1803         }
1804         seconds = offset % SECSPERMIN;
1805         offset /= SECSPERMIN;
1806         minutes = offset % MINSPERHOUR;
1807         offset /= MINSPERHOUR;
1808         hours = offset;
1809         if (hours >= HOURSPERDAY) {
1810                 result[0] = '\0';
1811                 return -1;
1812         }
1813         (void) sprintf(end(result), "%d", hours);
1814         if (minutes != 0 || seconds != 0) {
1815                 (void) sprintf(end(result), ":%02d", minutes);
1816                 if (seconds != 0)
1817                         (void) sprintf(end(result), ":%02d", seconds);
1818         }
1819         return 0;
1820 }
1821
1822 static int
1823 stringrule(result, rp, dstoff, gmtoff)
1824 char *                          result;
1825 const struct rule * const       rp;
1826 const long                      dstoff;
1827 const long                      gmtoff;
1828 {
1829         register long   tod;
1830
1831         result = end(result);
1832         if (rp->r_dycode == DC_DOM) {
1833                 register int    month, total;
1834
1835                 if (rp->r_dayofmonth == 29 && rp->r_month == TM_FEBRUARY)
1836                         return -1;
1837                 total = 0;
1838                 for (month = 0; month < rp->r_month; ++month)
1839                         total += len_months[0][month];
1840                 (void) sprintf(result, "J%d", total + rp->r_dayofmonth);
1841         } else {
1842                 register int    week;
1843
1844                 if (rp->r_dycode == DC_DOWGEQ) {
1845                         week = 1 + rp->r_dayofmonth / DAYSPERWEEK;
1846                         if ((week - 1) * DAYSPERWEEK + 1 != rp->r_dayofmonth)
1847                                 return -1;
1848                 } else if (rp->r_dycode == DC_DOWLEQ) {
1849                         if (rp->r_dayofmonth == len_months[1][rp->r_month])
1850                                 week = 5;
1851                         else {
1852                                 week = 1 + rp->r_dayofmonth / DAYSPERWEEK;
1853                                 if (week * DAYSPERWEEK - 1 != rp->r_dayofmonth)
1854                                         return -1;
1855                         }
1856                 } else  return -1;      /* "cannot happen" */
1857                 (void) sprintf(result, "M%d.%d.%d",
1858                         rp->r_month + 1, week, rp->r_wday);
1859         }
1860         tod = rp->r_tod;
1861         if (rp->r_todisgmt)
1862                 tod += gmtoff;
1863         if (rp->r_todisstd && rp->r_stdoff == 0)
1864                 tod += dstoff;
1865         if (tod < 0) {
1866                 result[0] = '\0';
1867                 return -1;
1868         }
1869         if (tod != 2 * SECSPERMIN * MINSPERHOUR) {
1870                 (void) strcat(result, "/");
1871                 if (stringoffset(end(result), tod) != 0)
1872                         return -1;
1873         }
1874         return 0;
1875 }
1876
1877 static void
1878 stringzone(result, zpfirst, zonecount)
1879 char *                          result;
1880 const struct zone * const       zpfirst;
1881 const int                       zonecount;
1882 {
1883         register const struct zone *    zp;
1884         register struct rule *          rp;
1885         register struct rule *          stdrp;
1886         register struct rule *          dstrp;
1887         register int                    i;
1888         register const char *           abbrvar;
1889
1890         result[0] = '\0';
1891         zp = zpfirst + zonecount - 1;
1892         stdrp = dstrp = NULL;
1893         for (i = 0; i < zp->z_nrules; ++i) {
1894                 rp = &zp->z_rules[i];
1895                 if (rp->r_hiwasnum || rp->r_hiyear != INT_MAX)
1896                         continue;
1897                 if (rp->r_yrtype != NULL)
1898                         continue;
1899                 if (rp->r_stdoff == 0) {
1900                         if (stdrp == NULL)
1901                                 stdrp = rp;
1902                         else    return;
1903                 } else {
1904                         if (dstrp == NULL)
1905                                 dstrp = rp;
1906                         else    return;
1907                 }
1908         }
1909         if (stdrp == NULL && dstrp == NULL) {
1910                 /*
1911                 ** There are no rules running through "max".
1912                 ** Let's find the latest rule.
1913                 */
1914                 for (i = 0; i < zp->z_nrules; ++i) {
1915                         rp = &zp->z_rules[i];
1916                         if (stdrp == NULL || rp->r_hiyear > stdrp->r_hiyear ||
1917                                 (rp->r_hiyear == stdrp->r_hiyear &&
1918                                 rp->r_month > stdrp->r_month))
1919                                         stdrp = rp;
1920                 }
1921                 if (stdrp != NULL && stdrp->r_stdoff != 0)
1922                         return; /* We end up in DST (a POSIX no-no). */
1923                 /*
1924                 ** Horrid special case: if year is 2037,
1925                 ** presume this is a zone handled on a year-by-year basis;
1926                 ** do not try to apply a rule to the zone.
1927                 */
1928                 if (stdrp != NULL && stdrp->r_hiyear == 2037)
1929                         return;
1930         }
1931         if (stdrp == NULL && zp->z_nrules != 0)
1932                 return;
1933         abbrvar = (stdrp == NULL) ? "" : stdrp->r_abbrvar;
1934         doabbr(result, zp->z_format, abbrvar, FALSE, TRUE);
1935         if (stringoffset(end(result), -zp->z_gmtoff) != 0) {
1936                 result[0] = '\0';
1937                 return;
1938         }
1939         if (dstrp == NULL)
1940                 return;
1941         doabbr(end(result), zp->z_format, dstrp->r_abbrvar, TRUE, TRUE);
1942         if (dstrp->r_stdoff != SECSPERMIN * MINSPERHOUR)
1943                 if (stringoffset(end(result),
1944                         -(zp->z_gmtoff + dstrp->r_stdoff)) != 0) {
1945                                 result[0] = '\0';
1946                                 return;
1947                 }
1948         (void) strcat(result, ",");
1949         if (stringrule(result, dstrp, dstrp->r_stdoff, zp->z_gmtoff) != 0) {
1950                 result[0] = '\0';
1951                 return;
1952         }
1953         (void) strcat(result, ",");
1954         if (stringrule(result, stdrp, dstrp->r_stdoff, zp->z_gmtoff) != 0) {
1955                 result[0] = '\0';
1956                 return;
1957         }
1958 }
1959
1960 static void
1961 outzone(zpfirst, zonecount)
1962 const struct zone * const       zpfirst;
1963 const int                       zonecount;
1964 {
1965         register const struct zone *    zp;
1966         register struct rule *          rp;
1967         register int                    i, j;
1968         register int                    usestart, useuntil;
1969         register zic_t                  starttime, untiltime;
1970         register long                   gmtoff;
1971         register long                   stdoff;
1972         register int                    year;
1973         register long                   startoff;
1974         register int                    startttisstd;
1975         register int                    startttisgmt;
1976         register int                    type;
1977         register char *                 startbuf;
1978         register char *                 ab;
1979         register char *                 envvar;
1980         register int                    max_abbr_len;
1981         register int                    max_envvar_len;
1982
1983         max_abbr_len = 2 + max_format_len + max_abbrvar_len;
1984         max_envvar_len = 2 * max_abbr_len + 5 * 9;
1985         startbuf = emalloc(max_abbr_len + 1);
1986         ab = emalloc(max_abbr_len + 1);
1987         envvar = emalloc(max_envvar_len + 1);
1988         INITIALIZE(untiltime);
1989         INITIALIZE(starttime);
1990         /*
1991         ** Now. . .finally. . .generate some useful data!
1992         */
1993         timecnt = 0;
1994         typecnt = 0;
1995         charcnt = 0;
1996         /*
1997         ** Thanks to Earl Chew
1998         ** for noting the need to unconditionally initialize startttisstd.
1999         */
2000         startttisstd = FALSE;
2001         startttisgmt = FALSE;
2002         min_year = max_year = EPOCH_YEAR;
2003         if (leapseen) {
2004                 updateminmax(leapminyear);
2005                 updateminmax(leapmaxyear);
2006         }
2007         for (i = 0; i < zonecount; ++i) {
2008                 zp = &zpfirst[i];
2009                 updateminmax(zp->z_untilrule.r_loyear);
2010                 for (j = 0; j < zp->z_nrules; ++j) {
2011                         rp = &zp->z_rules[j];
2012                         if (rp->r_lowasnum)
2013                                 updateminmax(rp->r_loyear);
2014                         if (rp->r_hiwasnum)
2015                                 updateminmax(rp->r_hiyear);
2016                 }
2017         }
2018         /*
2019         ** Generate lots of data if a rule can't cover all future times.
2020         */
2021         stringzone(envvar, zpfirst, zonecount);
2022         if (noise && envvar[0] == '\0') {
2023                 register char * wp;
2024
2025 wp = ecpyalloc(_("no POSIX environment variable for zone"));
2026                 wp = ecatalloc(wp, " ");
2027                 wp = ecatalloc(wp, zpfirst->z_name);
2028                 warning(wp);
2029                 ifree(wp);
2030         }
2031         if (envvar[0] == '\0') {
2032                 if (min_year >= INT_MIN + YEARSPERREPEAT)
2033                         min_year -= YEARSPERREPEAT;
2034                 else    min_year = INT_MIN;
2035                 if (max_year <= INT_MAX - YEARSPERREPEAT)
2036                         max_year += YEARSPERREPEAT;
2037                 else    max_year = INT_MAX;
2038         }
2039         /*
2040         ** For the benefit of older systems, generate data through 2037.
2041         */
2042         if (max_year < 2037)
2043                 max_year = 2037;
2044         for (i = 0; i < zonecount; ++i) {
2045                 /*
2046                 ** A guess that may well be corrected later.
2047                 */
2048                 stdoff = 0;
2049                 zp = &zpfirst[i];
2050                 usestart = i > 0 && (zp - 1)->z_untiltime > min_time;
2051                 useuntil = i < (zonecount - 1);
2052                 if (useuntil && zp->z_untiltime <= min_time)
2053                         continue;
2054                 gmtoff = zp->z_gmtoff;
2055                 eat(zp->z_filename, zp->z_linenum);
2056                 *startbuf = '\0';
2057                 startoff = zp->z_gmtoff;
2058                 if (zp->z_nrules == 0) {
2059                         stdoff = zp->z_stdoff;
2060                         doabbr(startbuf, zp->z_format,
2061                                 (char *) NULL, stdoff != 0, FALSE);
2062                         type = addtype(oadd(zp->z_gmtoff, stdoff),
2063                                 startbuf, stdoff != 0, startttisstd,
2064                                 startttisgmt);
2065                         if (usestart) {
2066                                 addtt(starttime, type);
2067                                 usestart = FALSE;
2068                         } else if (stdoff != 0)
2069                                 addtt(min_time, type);
2070                 } else for (year = min_year; year <= max_year; ++year) {
2071                         if (useuntil && year > zp->z_untilrule.r_hiyear)
2072                                 break;
2073                         /*
2074                         ** Mark which rules to do in the current year.
2075                         ** For those to do, calculate rpytime(rp, year);
2076                         */
2077                         for (j = 0; j < zp->z_nrules; ++j) {
2078                                 rp = &zp->z_rules[j];
2079                                 eats(zp->z_filename, zp->z_linenum,
2080                                         rp->r_filename, rp->r_linenum);
2081                                 rp->r_todo = year >= rp->r_loyear &&
2082                                                 year <= rp->r_hiyear &&
2083                                                 yearistype(year, rp->r_yrtype);
2084                                 if (rp->r_todo)
2085                                         rp->r_temp = rpytime(rp, year);
2086                         }
2087                         for ( ; ; ) {
2088                                 register int    k;
2089                                 register zic_t  jtime, ktime;
2090                                 register long   offset;
2091
2092                                 INITIALIZE(ktime);
2093                                 if (useuntil) {
2094                                         /*
2095                                         ** Turn untiltime into UTC
2096                                         ** assuming the current gmtoff and
2097                                         ** stdoff values.
2098                                         */
2099                                         untiltime = zp->z_untiltime;
2100                                         if (!zp->z_untilrule.r_todisgmt)
2101                                                 untiltime = tadd(untiltime,
2102                                                         -gmtoff);
2103                                         if (!zp->z_untilrule.r_todisstd)
2104                                                 untiltime = tadd(untiltime,
2105                                                         -stdoff);
2106                                 }
2107                                 /*
2108                                 ** Find the rule (of those to do, if any)
2109                                 ** that takes effect earliest in the year.
2110                                 */
2111                                 k = -1;
2112                                 for (j = 0; j < zp->z_nrules; ++j) {
2113                                         rp = &zp->z_rules[j];
2114                                         if (!rp->r_todo)
2115                                                 continue;
2116                                         eats(zp->z_filename, zp->z_linenum,
2117                                                 rp->r_filename, rp->r_linenum);
2118                                         offset = rp->r_todisgmt ? 0 : gmtoff;
2119                                         if (!rp->r_todisstd)
2120                                                 offset = oadd(offset, stdoff);
2121                                         jtime = rp->r_temp;
2122                                         if (jtime == min_time ||
2123                                                 jtime == max_time)
2124                                                         continue;
2125                                         jtime = tadd(jtime, -offset);
2126                                         if (k < 0 || jtime < ktime) {
2127                                                 k = j;
2128                                                 ktime = jtime;
2129                                         }
2130                                 }
2131                                 if (k < 0)
2132                                         break;  /* go on to next year */
2133                                 rp = &zp->z_rules[k];
2134                                 rp->r_todo = FALSE;
2135                                 if (useuntil && ktime >= untiltime)
2136                                         break;
2137                                 stdoff = rp->r_stdoff;
2138                                 if (usestart && ktime == starttime)
2139                                         usestart = FALSE;
2140                                 if (usestart) {
2141                                         if (ktime < starttime) {
2142                                                 startoff = oadd(zp->z_gmtoff,
2143                                                         stdoff);
2144                                                 doabbr(startbuf, zp->z_format,
2145                                                         rp->r_abbrvar,
2146                                                         rp->r_stdoff != 0,
2147                                                         FALSE);
2148                                                 continue;
2149                                         }
2150                                         if (*startbuf == '\0' &&
2151                                                 startoff == oadd(zp->z_gmtoff,
2152                                                 stdoff)) {
2153                                                         doabbr(startbuf,
2154                                                                 zp->z_format,
2155                                                                 rp->r_abbrvar,
2156                                                                 rp->r_stdoff !=
2157                                                                 0,
2158                                                                 FALSE);
2159                                         }
2160                                 }
2161                                 eats(zp->z_filename, zp->z_linenum,
2162                                         rp->r_filename, rp->r_linenum);
2163                                 doabbr(ab, zp->z_format, rp->r_abbrvar,
2164                                         rp->r_stdoff != 0, FALSE);
2165                                 offset = oadd(zp->z_gmtoff, rp->r_stdoff);
2166                                 type = addtype(offset, ab, rp->r_stdoff != 0,
2167                                         rp->r_todisstd, rp->r_todisgmt);
2168                                 addtt(ktime, type);
2169                         }
2170                 }
2171                 if (usestart) {
2172                         if (*startbuf == '\0' &&
2173                                 zp->z_format != NULL &&
2174                                 strchr(zp->z_format, '%') == NULL &&
2175                                 strchr(zp->z_format, '/') == NULL)
2176                                         (void) strcpy(startbuf, zp->z_format);
2177                         eat(zp->z_filename, zp->z_linenum);
2178                         if (*startbuf == '\0')
2179 error(_("can't determine time zone abbreviation to use just after until time"));
2180                         else    addtt(starttime,
2181                                         addtype(startoff, startbuf,
2182                                                 startoff != zp->z_gmtoff,
2183                                                 startttisstd,
2184                                                 startttisgmt));
2185                 }
2186                 /*
2187                 ** Now we may get to set starttime for the next zone line.
2188                 */
2189                 if (useuntil) {
2190                         startttisstd = zp->z_untilrule.r_todisstd;
2191                         startttisgmt = zp->z_untilrule.r_todisgmt;
2192                         starttime = zp->z_untiltime;
2193                         if (!startttisstd)
2194                                 starttime = tadd(starttime, -stdoff);
2195                         if (!startttisgmt)
2196                                 starttime = tadd(starttime, -gmtoff);
2197                 }
2198         }
2199         writezone(zpfirst->z_name, envvar);
2200         ifree(startbuf);
2201         ifree(ab);
2202         ifree(envvar);
2203 }
2204
2205 static void
2206 addtt(starttime, type)
2207 const zic_t     starttime;
2208 int             type;
2209 {
2210         if (starttime <= min_time ||
2211                 (timecnt == 1 && attypes[0].at < min_time)) {
2212                 gmtoffs[0] = gmtoffs[type];
2213                 isdsts[0] = isdsts[type];
2214                 ttisstds[0] = ttisstds[type];
2215                 ttisgmts[0] = ttisgmts[type];
2216                 if (abbrinds[type] != 0)
2217                         (void) strcpy(chars, &chars[abbrinds[type]]);
2218                 abbrinds[0] = 0;
2219                 charcnt = strlen(chars) + 1;
2220                 typecnt = 1;
2221                 timecnt = 0;
2222                 type = 0;
2223         }
2224         if (timecnt >= TZ_MAX_TIMES) {
2225                 error(_("too many transitions?!"));
2226                 exit(EXIT_FAILURE);
2227         }
2228         attypes[timecnt].at = starttime;
2229         attypes[timecnt].type = type;
2230         ++timecnt;
2231 }
2232
2233 static int
2234 addtype(gmtoff, abbr, isdst, ttisstd, ttisgmt)
2235 const long              gmtoff;
2236 const char * const      abbr;
2237 const int               isdst;
2238 const int               ttisstd;
2239 const int               ttisgmt;
2240 {
2241         register int    i, j;
2242
2243         if (isdst != TRUE && isdst != FALSE) {
2244                 error(_("internal error - addtype called with bad isdst"));
2245                 exit(EXIT_FAILURE);
2246         }
2247         if (ttisstd != TRUE && ttisstd != FALSE) {
2248                 error(_("internal error - addtype called with bad ttisstd"));
2249                 exit(EXIT_FAILURE);
2250         }
2251         if (ttisgmt != TRUE && ttisgmt != FALSE) {
2252                 error(_("internal error - addtype called with bad ttisgmt"));
2253                 exit(EXIT_FAILURE);
2254         }
2255         /*
2256         ** See if there's already an entry for this zone type.
2257         ** If so, just return its index.
2258         */
2259         for (i = 0; i < typecnt; ++i) {
2260                 if (gmtoff == gmtoffs[i] && isdst == isdsts[i] &&
2261                         strcmp(abbr, &chars[abbrinds[i]]) == 0 &&
2262                         ttisstd == ttisstds[i] &&
2263                         ttisgmt == ttisgmts[i])
2264                                 return i;
2265         }
2266         /*
2267         ** There isn't one; add a new one, unless there are already too
2268         ** many.
2269         */
2270         if (typecnt >= TZ_MAX_TYPES) {
2271                 error(_("too many local time types"));
2272                 exit(EXIT_FAILURE);
2273         }
2274         gmtoffs[i] = gmtoff;
2275         isdsts[i] = isdst;
2276         ttisstds[i] = ttisstd;
2277         ttisgmts[i] = ttisgmt;
2278
2279         for (j = 0; j < charcnt; ++j)
2280                 if (strcmp(&chars[j], abbr) == 0)
2281                         break;
2282         if (j == charcnt)
2283                 newabbr(abbr);
2284         abbrinds[i] = j;
2285         ++typecnt;
2286         return i;
2287 }
2288
2289 static void
2290 leapadd(t, positive, rolling, count)
2291 const zic_t     t;
2292 const int       positive;
2293 const int       rolling;
2294 int             count;
2295 {
2296         register int    i, j;
2297
2298         if (leapcnt + (positive ? count : 1) > TZ_MAX_LEAPS) {
2299                 error(_("too many leap seconds"));
2300                 exit(EXIT_FAILURE);
2301         }
2302         for (i = 0; i < leapcnt; ++i)
2303                 if (t <= trans[i]) {
2304                         if (t == trans[i]) {
2305                                 error(_("repeated leap second moment"));
2306                                 exit(EXIT_FAILURE);
2307                         }
2308                         break;
2309                 }
2310         do {
2311                 for (j = leapcnt; j > i; --j) {
2312                         trans[j] = trans[j - 1];
2313                         corr[j] = corr[j - 1];
2314                         roll[j] = roll[j - 1];
2315                 }
2316                 trans[i] = t;
2317                 corr[i] = positive ? 1L : eitol(-count);
2318                 roll[i] = rolling;
2319                 ++leapcnt;
2320         } while (positive && --count != 0);
2321 }
2322
2323 static void
2324 adjleap P((void))
2325 {
2326         register int    i;
2327         register long   last = 0;
2328
2329         /*
2330         ** propagate leap seconds forward
2331         */
2332         for (i = 0; i < leapcnt; ++i) {
2333                 trans[i] = tadd(trans[i], last);
2334                 last = corr[i] += last;
2335         }
2336 }
2337
2338 static int
2339 yearistype(year, type)
2340 const int               year;
2341 const char * const      type;
2342 {
2343         static char *   buf;
2344         int             result;
2345
2346         if (type == NULL || *type == '\0')
2347                 return TRUE;
2348         buf = erealloc(buf, (int) (132 + strlen(yitcommand) + strlen(type)));
2349         (void) sprintf(buf, "%s %d %s", yitcommand, year, type);
2350         result = system(buf);
2351         if (WIFEXITED(result)) switch (WEXITSTATUS(result)) {
2352                 case 0:
2353                         return TRUE;
2354                 case 1:
2355                         return FALSE;
2356         }
2357         error(_("Wild result from command execution"));
2358         (void) fprintf(stderr, _("%s: command was '%s', result was %d\n"),
2359                 progname, buf, result);
2360         for ( ; ; )
2361                 exit(EXIT_FAILURE);
2362 }
2363
2364 static int
2365 lowerit(a)
2366 int     a;
2367 {
2368         a = (unsigned char) a;
2369         return (isascii(a) && isupper(a)) ? tolower(a) : a;
2370 }
2371
2372 static int
2373 ciequal(ap, bp)         /* case-insensitive equality */
2374 register const char *   ap;
2375 register const char *   bp;
2376 {
2377         while (lowerit(*ap) == lowerit(*bp++))
2378                 if (*ap++ == '\0')
2379                         return TRUE;
2380         return FALSE;
2381 }
2382
2383 static int
2384 itsabbr(abbr, word)
2385 register const char *   abbr;
2386 register const char *   word;
2387 {
2388         if (lowerit(*abbr) != lowerit(*word))
2389                 return FALSE;
2390         ++word;
2391         while (*++abbr != '\0')
2392                 do {
2393                         if (*word == '\0')
2394                                 return FALSE;
2395                 } while (lowerit(*word++) != lowerit(*abbr));
2396         return TRUE;
2397 }
2398
2399 static const struct lookup *
2400 byword(word, table)
2401 register const char * const             word;
2402 register const struct lookup * const    table;
2403 {
2404         register const struct lookup *  foundlp;
2405         register const struct lookup *  lp;
2406
2407         if (word == NULL || table == NULL)
2408                 return NULL;
2409         /*
2410         ** Look for exact match.
2411         */
2412         for (lp = table; lp->l_word != NULL; ++lp)
2413                 if (ciequal(word, lp->l_word))
2414                         return lp;
2415         /*
2416         ** Look for inexact match.
2417         */
2418         foundlp = NULL;
2419         for (lp = table; lp->l_word != NULL; ++lp)
2420                 if (itsabbr(word, lp->l_word)) {
2421                         if (foundlp == NULL)
2422                                 foundlp = lp;
2423                         else    return NULL;    /* multiple inexact matches */
2424                 }
2425         return foundlp;
2426 }
2427
2428 static char **
2429 getfields(cp)
2430 register char * cp;
2431 {
2432         register char *         dp;
2433         register char **        array;
2434         register int            nsubs;
2435
2436         if (cp == NULL)
2437                 return NULL;
2438         array = (char **) (void *)
2439                 emalloc((int) ((strlen(cp) + 1) * sizeof *array));
2440         nsubs = 0;
2441         for ( ; ; ) {
2442                 while (isascii((unsigned char) *cp) &&
2443                         isspace((unsigned char) *cp))
2444                                 ++cp;
2445                 if (*cp == '\0' || *cp == '#')
2446                         break;
2447                 array[nsubs++] = dp = cp;
2448                 do {
2449                         if ((*dp = *cp++) != '"')
2450                                 ++dp;
2451                         else while ((*dp = *cp++) != '"')
2452                                 if (*dp != '\0')
2453                                         ++dp;
2454                                 else {
2455                                         error(_(
2456                                                 "Odd number of quotation marks"
2457                                                 ));
2458                                         exit(1);
2459                                 }
2460                 } while (*cp != '\0' && *cp != '#' &&
2461                         (!isascii(*cp) || !isspace((unsigned char) *cp)));
2462                 if (isascii(*cp) && isspace((unsigned char) *cp))
2463                         ++cp;
2464                 *dp = '\0';
2465         }
2466         array[nsubs] = NULL;
2467         return array;
2468 }
2469
2470 static long
2471 oadd(t1, t2)
2472 const long      t1;
2473 const long      t2;
2474 {
2475         register long   t;
2476
2477         t = t1 + t2;
2478         if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {
2479                 error(_("time overflow"));
2480                 exit(EXIT_FAILURE);
2481         }
2482         return t;
2483 }
2484
2485 static zic_t
2486 tadd(t1, t2)
2487 const zic_t     t1;
2488 const long      t2;
2489 {
2490         register zic_t  t;
2491
2492         if (t1 == max_time && t2 > 0)
2493                 return max_time;
2494         if (t1 == min_time && t2 < 0)
2495                 return min_time;
2496         t = t1 + t2;
2497         if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {
2498                 error(_("time overflow"));
2499                 exit(EXIT_FAILURE);
2500         }
2501         return t;
2502 }
2503
2504 /*
2505 ** Given a rule, and a year, compute the date - in seconds since January 1,
2506 ** 1970, 00:00 LOCAL time - in that year that the rule refers to.
2507 */
2508
2509 static zic_t
2510 rpytime(rp, wantedy)
2511 register const struct rule * const      rp;
2512 register const int                      wantedy;
2513 {
2514         register int    y, m, i;
2515         register long   dayoff;                 /* with a nod to Margaret O. */
2516         register zic_t  t;
2517
2518         if (wantedy == INT_MIN)
2519                 return min_time;
2520         if (wantedy == INT_MAX)
2521                 return max_time;
2522         dayoff = 0;
2523         m = TM_JANUARY;
2524         y = EPOCH_YEAR;
2525         while (wantedy != y) {
2526                 if (wantedy > y) {
2527                         i = len_years[isleap(y)];
2528                         ++y;
2529                 } else {
2530                         --y;
2531                         i = -len_years[isleap(y)];
2532                 }
2533                 dayoff = oadd(dayoff, eitol(i));
2534         }
2535         while (m != rp->r_month) {
2536                 i = len_months[isleap(y)][m];
2537                 dayoff = oadd(dayoff, eitol(i));
2538                 ++m;
2539         }
2540         i = rp->r_dayofmonth;
2541         if (m == TM_FEBRUARY && i == 29 && !isleap(y)) {
2542                 if (rp->r_dycode == DC_DOWLEQ)
2543                         --i;
2544                 else {
2545                         error(_("use of 2/29 in non leap-year"));
2546                         exit(EXIT_FAILURE);
2547                 }
2548         }
2549         --i;
2550         dayoff = oadd(dayoff, eitol(i));
2551         if (rp->r_dycode == DC_DOWGEQ || rp->r_dycode == DC_DOWLEQ) {
2552                 register long   wday;
2553
2554 #define LDAYSPERWEEK    ((long) DAYSPERWEEK)
2555                 wday = eitol(EPOCH_WDAY);
2556                 /*
2557                 ** Don't trust mod of negative numbers.
2558                 */
2559                 if (dayoff >= 0)
2560                         wday = (wday + dayoff) % LDAYSPERWEEK;
2561                 else {
2562                         wday -= ((-dayoff) % LDAYSPERWEEK);
2563                         if (wday < 0)
2564                                 wday += LDAYSPERWEEK;
2565                 }
2566                 while (wday != eitol(rp->r_wday))
2567                         if (rp->r_dycode == DC_DOWGEQ) {
2568                                 dayoff = oadd(dayoff, (long) 1);
2569                                 if (++wday >= LDAYSPERWEEK)
2570                                         wday = 0;
2571                                 ++i;
2572                         } else {
2573                                 dayoff = oadd(dayoff, (long) -1);
2574                                 if (--wday < 0)
2575                                         wday = LDAYSPERWEEK - 1;
2576                                 --i;
2577                         }
2578                 if (i < 0 || i >= len_months[isleap(y)][m]) {
2579                         if (noise)
2580                                 warning(_("rule goes past start/end of month--\
2581 will not work with pre-2004 versions of zic"));
2582                 }
2583         }
2584         if (dayoff < min_time / SECSPERDAY)
2585                 return min_time;
2586         if (dayoff > max_time / SECSPERDAY)
2587                 return max_time;
2588         t = (zic_t) dayoff * SECSPERDAY;
2589         return tadd(t, rp->r_tod);
2590 }
2591
2592 static void
2593 newabbr(string)
2594 const char * const      string;
2595 {
2596         register int    i;
2597
2598         if (strcmp(string, GRANDPARENTED) != 0) {
2599                 register const char *   cp;
2600                 register char *         wp;
2601
2602                 /*
2603                 ** Want one to ZIC_MAX_ABBR_LEN_WO_WARN alphabetics
2604                 ** optionally followed by a + or - and a number from 1 to 14.
2605                 */
2606                 cp = string;
2607                 wp = NULL;
2608                 while (isascii((unsigned char) *cp) &&
2609                         isalpha((unsigned char) *cp))
2610                                 ++cp;
2611                 if (cp - string == 0)
2612 wp = _("time zone abbreviation lacks alphabetic at start");
2613                 if (noise && cp - string > 3)
2614 wp = _("time zone abbreviation has more than 3 alphabetics");
2615                 if (cp - string > ZIC_MAX_ABBR_LEN_WO_WARN)
2616 wp = _("time zone abbreviation has too many alphabetics");
2617                 if (wp == NULL && (*cp == '+' || *cp == '-')) {
2618                         ++cp;
2619                         if (isascii((unsigned char) *cp) &&
2620                                 isdigit((unsigned char) *cp))
2621                                         if (*cp++ == '1' &&
2622                                                 *cp >= '0' && *cp <= '4')
2623                                                         ++cp;
2624                 }
2625                 if (*cp != '\0')
2626 wp = _("time zone abbreviation differs from POSIX standard");
2627                 if (wp != NULL) {
2628                         wp = ecpyalloc(wp);
2629                         wp = ecatalloc(wp, " (");
2630                         wp = ecatalloc(wp, string);
2631                         wp = ecatalloc(wp, ")");
2632                         warning(wp);
2633                         ifree(wp);
2634                 }
2635         }
2636         i = strlen(string) + 1;
2637         if (charcnt + i > TZ_MAX_CHARS) {
2638                 error(_("too many, or too long, time zone abbreviations"));
2639                 exit(EXIT_FAILURE);
2640         }
2641         (void) strcpy(&chars[charcnt], string);
2642         charcnt += eitol(i);
2643 }
2644
2645 static int
2646 mkdirs(argname)
2647 char *          argname;
2648 {
2649         register char * name;
2650         register char * cp;
2651
2652         if (argname == NULL || *argname == '\0')
2653                 return 0;
2654         cp = name = ecpyalloc(argname);
2655         while ((cp = strchr(cp + 1, '/')) != 0) {
2656                 *cp = '\0';
2657 #ifndef unix
2658                 /*
2659                 ** DOS drive specifier?
2660                 */
2661                 if (isalpha((unsigned char) name[0]) &&
2662                         name[1] == ':' && name[2] == '\0') {
2663                                 *cp = '/';
2664                                 continue;
2665                 }
2666 #endif /* !defined unix */
2667                 if (!itsdir(name)) {
2668                         /*
2669                         ** It doesn't seem to exist, so we try to create it.
2670                         ** Creation may fail because of the directory being
2671                         ** created by some other multiprocessor, so we get
2672                         ** to do extra checking.
2673                         */
2674                         if (mkdir(name, MKDIR_UMASK) != 0) {
2675                                 const char *e = strerror(errno);
2676
2677                                 if (errno != EEXIST || !itsdir(name)) {
2678                                         (void) fprintf(stderr,
2679 _("%s: Can't create directory %s: %s\n"),
2680                                                 progname, name, e);
2681                                         ifree(name);
2682                                         return -1;
2683                                 }
2684                         }
2685                 }
2686                 *cp = '/';
2687         }
2688         ifree(name);
2689         return 0;
2690 }
2691
2692 static long
2693 eitol(i)
2694 const int       i;
2695 {
2696         long    l;
2697
2698         l = i;
2699         if ((i < 0 && l >= 0) || (i == 0 && l != 0) || (i > 0 && l <= 0)) {
2700                 (void) fprintf(stderr,
2701                         _("%s: %d did not sign extend correctly\n"),
2702                         progname, i);
2703                 exit(EXIT_FAILURE);
2704         }
2705         return l;
2706 }
2707
2708 /*
2709 ** UNIX was a registered trademark of The Open Group in 2003.
2710 */