Sat Apr 20 17:07:17 1996 Ulrich Drepper <drepper@cygnus.com>
[kopensolaris-gnu/glibc.git] / time / zic.c
1 #ifndef lint
2 #ifndef NOID
3 static char     elsieid[] = "@(#)zic.c  7.62";
4 #endif /* !defined NOID */
5 #endif /* !defined lint */
6
7 #include "private.h"
8 #include "locale.h"
9 #include "tzfile.h"
10 #ifdef unix
11 #include "sys/stat.h"                   /* for umask manifest constants */
12 #endif /* defined unix */
13
14 /*
15 ** On some ancient hosts, predicates like `isspace(C)' are defined
16 ** only if isascii(C) || C == EOF.  Modern hosts obey the C Standard,
17 ** which says they are defined only if C == ((unsigned char) C) || C == EOF.
18 ** Neither the C Standard nor Posix require that `isascii' exist.
19 ** For portability, we check both ancient and modern requirements.
20 ** If isascii is not defined, the isascii check succeeds trivially.
21 */
22 #include "ctype.h"
23 #ifndef isascii
24 #define isascii(x) 1
25 #endif
26
27 struct rule {
28         const char *    r_filename;
29         int             r_linenum;
30         const char *    r_name;
31
32         int             r_loyear;       /* for example, 1986 */
33         int             r_hiyear;       /* for example, 1986 */
34         const char *    r_yrtype;
35
36         int             r_month;        /* 0..11 */
37
38         int             r_dycode;       /* see below */
39         int             r_dayofmonth;
40         int             r_wday;
41
42         long            r_tod;          /* time from midnight */
43         int             r_todisstd;     /* above is standard time if TRUE */
44                                         /* or wall clock time if FALSE */
45         int             r_todisgmt;     /* above is GMT if TRUE */
46                                         /* or local time if FALSE */
47         long            r_stdoff;       /* offset from standard time */
48         const char *    r_abbrvar;      /* variable part of abbreviation */
49
50         int             r_todo;         /* a rule to do (used in outzone) */
51         time_t          r_temp;         /* used in outzone */
52 };
53
54 /*
55 **      r_dycode                r_dayofmonth    r_wday
56 */
57
58 #define DC_DOM          0       /* 1..31 */     /* unused */
59 #define DC_DOWGEQ       1       /* 1..31 */     /* 0..6 (Sun..Sat) */
60 #define DC_DOWLEQ       2       /* 1..31 */     /* 0..6 (Sun..Sat) */
61
62 struct zone {
63         const char *    z_filename;
64         int             z_linenum;
65
66         const char *    z_name;
67         long            z_gmtoff;
68         const char *    z_rule;
69         const char *    z_format;
70
71         long            z_stdoff;
72
73         struct rule *   z_rules;
74         int             z_nrules;
75
76         struct rule     z_untilrule;
77         time_t          z_untiltime;
78 };
79
80 extern int      getopt P((int argc, char * const argv[],
81                         const char * options));
82 extern char *   icatalloc P((char * old, const char * new));
83 extern char *   icpyalloc P((const char * string));
84 extern void     ifree P((char * p));
85 extern char *   imalloc P((int n));
86 extern void *   irealloc P((void * old, int n));
87 extern int      link P((const char * fromname, const char * toname));
88 extern char *   optarg;
89 extern int      optind;
90 extern char *   scheck P((const char * string, const char * format));
91
92 static void     addtt P((time_t starttime, int type));
93 static int      addtype P((long gmtoff, const char * abbr, int isdst,
94                                 int ttisstd, int ttisgmt));
95 static void     leapadd P((time_t t, int positive, int rolling, int count));
96 static void     adjleap P((void));
97 static void     associate P((void));
98 static int      ciequal P((const char * ap, const char * bp));
99 static void     convert P((long val, char * buf));
100 static void     dolink P((const char * fromfile, const char * tofile));
101 static void     doabbr P((char * abbr, const char * format,
102                         const char * letters, int isdst));
103 static void     eat P((const char * name, int num));
104 static void     eats P((const char * name, int num,
105                         const char * rname, int rnum));
106 static long     eitol P((int i));
107 static void     error P((const char * message));
108 static char **  getfields P((char * buf));
109 static long     gethms P((const char * string, const char * errstrng,
110                         int signable));
111 static void     infile P((const char * filename));
112 static void     inleap P((char ** fields, int nfields));
113 static void     inlink P((char ** fields, int nfields));
114 static void     inrule P((char ** fields, int nfields));
115 static int      inzcont P((char ** fields, int nfields));
116 static int      inzone P((char ** fields, int nfields));
117 static int      inzsub P((char ** fields, int nfields, int iscont));
118 static int      itsabbr P((const char * abbr, const char * word));
119 static int      itsdir P((const char * name));
120 static int      lowerit P((int c));
121 static char *   memcheck P((char * tocheck));
122 static int      mkdirs P((char * filename));
123 static void     newabbr P((const char * abbr));
124 static long     oadd P((long t1, long t2));
125 static void     outzone P((const struct zone * zp, int ntzones));
126 static void     puttzcode P((long code, FILE * fp));
127 static int      rcomp P((const void * leftp, const void * rightp));
128 static time_t   rpytime P((const struct rule * rp, int wantedy));
129 static void     rulesub P((struct rule * rp,
130                         const char * loyearp, const char * hiyearp,
131                         const char * typep, const char * monthp,
132                         const char * dayp, const char * timep));
133 static void     setboundaries P((void));
134 static time_t   tadd P((time_t t1, long t2));
135 static void     usage P((void));
136 static void     writezone P((const char * name));
137 static int      yearistype P((int year, const char * type));
138
139 #if !HAVE_STRERROR
140 static char *   strerror P((int));
141 #endif /* !HAVE_STRERROR */
142
143 static int              charcnt;
144 static int              errors;
145 static const char *     filename;
146 static int              leapcnt;
147 static int              linenum;
148 static time_t           max_time;
149 static int              max_year;
150 static time_t           min_time;
151 static int              min_year;
152 static int              noise;
153 static const char *     rfilename;
154 static int              rlinenum;
155 static const char *     progname;
156 static int              timecnt;
157 static int              typecnt;
158
159 /*
160 ** Line codes.
161 */
162
163 #define LC_RULE         0
164 #define LC_ZONE         1
165 #define LC_LINK         2
166 #define LC_LEAP         3
167
168 /*
169 ** Which fields are which on a Zone line.
170 */
171
172 #define ZF_NAME         1
173 #define ZF_GMTOFF       2
174 #define ZF_RULE         3
175 #define ZF_FORMAT       4
176 #define ZF_TILYEAR      5
177 #define ZF_TILMONTH     6
178 #define ZF_TILDAY       7
179 #define ZF_TILTIME      8
180 #define ZONE_MINFIELDS  5
181 #define ZONE_MAXFIELDS  9
182
183 /*
184 ** Which fields are which on a Zone continuation line.
185 */
186
187 #define ZFC_GMTOFF      0
188 #define ZFC_RULE        1
189 #define ZFC_FORMAT      2
190 #define ZFC_TILYEAR     3
191 #define ZFC_TILMONTH    4
192 #define ZFC_TILDAY      5
193 #define ZFC_TILTIME     6
194 #define ZONEC_MINFIELDS 3
195 #define ZONEC_MAXFIELDS 7
196
197 /*
198 ** Which files are which on a Rule line.
199 */
200
201 #define RF_NAME         1
202 #define RF_LOYEAR       2
203 #define RF_HIYEAR       3
204 #define RF_COMMAND      4
205 #define RF_MONTH        5
206 #define RF_DAY          6
207 #define RF_TOD          7
208 #define RF_STDOFF       8
209 #define RF_ABBRVAR      9
210 #define RULE_FIELDS     10
211
212 /*
213 ** Which fields are which on a Link line.
214 */
215
216 #define LF_FROM         1
217 #define LF_TO           2
218 #define LINK_FIELDS     3
219
220 /*
221 ** Which fields are which on a Leap line.
222 */
223
224 #define LP_YEAR         1
225 #define LP_MONTH        2
226 #define LP_DAY          3
227 #define LP_TIME         4
228 #define LP_CORR         5
229 #define LP_ROLL         6
230 #define LEAP_FIELDS     7
231
232 /*
233 ** Year synonyms.
234 */
235
236 #define YR_MINIMUM      0
237 #define YR_MAXIMUM      1
238 #define YR_ONLY         2
239
240 static struct rule *    rules;
241 static int              nrules; /* number of rules */
242
243 static struct zone *    zones;
244 static int              nzones; /* number of zones */
245
246 struct link {
247         const char *    l_filename;
248         int             l_linenum;
249         const char *    l_from;
250         const char *    l_to;
251 };
252
253 static struct link *    links;
254 static int              nlinks;
255
256 struct lookup {
257         const char *    l_word;
258         const int       l_value;
259 };
260
261 static struct lookup const *    byword P((const char * string,
262                                         const struct lookup * lp));
263
264 static struct lookup const      line_codes[] = {
265         { "Rule",       LC_RULE },
266         { "Zone",       LC_ZONE },
267         { "Link",       LC_LINK },
268         { "Leap",       LC_LEAP },
269         { NULL,         0}
270 };
271
272 static struct lookup const      mon_names[] = {
273         { "January",    TM_JANUARY },
274         { "February",   TM_FEBRUARY },
275         { "March",      TM_MARCH },
276         { "April",      TM_APRIL },
277         { "May",        TM_MAY },
278         { "June",       TM_JUNE },
279         { "July",       TM_JULY },
280         { "August",     TM_AUGUST },
281         { "September",  TM_SEPTEMBER },
282         { "October",    TM_OCTOBER },
283         { "November",   TM_NOVEMBER },
284         { "December",   TM_DECEMBER },
285         { NULL,         0 }
286 };
287
288 static struct lookup const      wday_names[] = {
289         { "Sunday",     TM_SUNDAY },
290         { "Monday",     TM_MONDAY },
291         { "Tuesday",    TM_TUESDAY },
292         { "Wednesday",  TM_WEDNESDAY },
293         { "Thursday",   TM_THURSDAY },
294         { "Friday",     TM_FRIDAY },
295         { "Saturday",   TM_SATURDAY },
296         { NULL,         0 }
297 };
298
299 static struct lookup const      lasts[] = {
300         { "last-Sunday",        TM_SUNDAY },
301         { "last-Monday",        TM_MONDAY },
302         { "last-Tuesday",       TM_TUESDAY },
303         { "last-Wednesday",     TM_WEDNESDAY },
304         { "last-Thursday",      TM_THURSDAY },
305         { "last-Friday",        TM_FRIDAY },
306         { "last-Saturday",      TM_SATURDAY },
307         { NULL,                 0 }
308 };
309
310 static struct lookup const      begin_years[] = {
311         { "minimum",    YR_MINIMUM },
312         { "maximum",    YR_MAXIMUM },
313         { NULL,         0 }
314 };
315
316 static struct lookup const      end_years[] = {
317         { "minimum",    YR_MINIMUM },
318         { "maximum",    YR_MAXIMUM },
319         { "only",       YR_ONLY },
320         { NULL,         0 }
321 };
322
323 static struct lookup const      leap_types[] = {
324         { "Rolling",    TRUE },
325         { "Stationary", FALSE },
326         { NULL,         0 }
327 };
328
329 static const int        len_months[2][MONSPERYEAR] = {
330         { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
331         { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
332 };
333
334 static const int        len_years[2] = {
335         DAYSPERNYEAR, DAYSPERLYEAR
336 };
337
338 static time_t           ats[TZ_MAX_TIMES];
339 static unsigned char    types[TZ_MAX_TIMES];
340 static long             gmtoffs[TZ_MAX_TYPES];
341 static char             isdsts[TZ_MAX_TYPES];
342 static unsigned char    abbrinds[TZ_MAX_TYPES];
343 static char             ttisstds[TZ_MAX_TYPES];
344 static char             ttisgmts[TZ_MAX_TYPES];
345 static char             chars[TZ_MAX_CHARS];
346 static time_t           trans[TZ_MAX_LEAPS];
347 static long             corr[TZ_MAX_LEAPS];
348 static char             roll[TZ_MAX_LEAPS];
349
350 /*
351 ** Memory allocation.
352 */
353
354 static char *
355 memcheck(ptr)
356 char * const    ptr;
357 {
358         if (ptr == NULL) {
359                 const char *e = strerror(errno);
360                 (void) fprintf(stderr, _("%s: Memory exhausted: %s\n"),
361                         progname, e);
362                 (void) exit(EXIT_FAILURE);
363         }
364         return ptr;
365 }
366
367 #define emalloc(size)           memcheck(imalloc(size))
368 #define erealloc(ptr, size)     memcheck(irealloc((ptr), (size)))
369 #define ecpyalloc(ptr)          memcheck(icpyalloc(ptr))
370 #define ecatalloc(oldp, newp)   memcheck(icatalloc((oldp), (newp)))
371
372 /*
373 ** Error handling.
374 */
375
376 #if ! HAVE_STRERROR
377 static char *
378 strerror(errnum)
379 int     errnum;
380 {
381         extern char *sys_errlist[];
382         extern int sys_nerr;
383
384         if (errnum > 0 && errnum <= sys_nerr)
385                 return sys_errlist[errnum];
386         return "Unknown system error";
387 }
388 #endif /* ! HAVE_STRERROR */
389
390 static void
391 eats(name, num, rname, rnum)
392 const char * const      name;
393 const int               num;
394 const char * const      rname;
395 const int               rnum;
396 {
397         filename = name;
398         linenum = num;
399         rfilename = rname;
400         rlinenum = rnum;
401 }
402
403 static void
404 eat(name, num)
405 const char * const      name;
406 const int               num;
407 {
408         eats(name, num, (char *) NULL, -1);
409 }
410
411 static void
412 error(string)
413 const char * const      string;
414 {
415         /*
416         ** Match the format of "cc" to allow sh users to
417         **      zic ... 2>&1 | error -t "*" -v
418         ** on BSD systems.
419         */
420         (void) fprintf(stderr, _("\"%s\", line %d: %s"),
421                 filename, linenum, string);
422         if (rfilename != NULL)
423                 (void) fprintf(stderr, _(" (rule from \"%s\", line %d)"),
424                         rfilename, rlinenum);
425         (void) fprintf(stderr, "\n");
426         ++errors;
427 }
428
429 static void
430 usage P((void))
431 {
432         (void) fprintf(stderr, _("%s: usage is %s \
433 [ -s ] [ -v ] [ -l localtime ] [ -p posixrules ] [ -d directory ]\n\
434 \t[ -L leapseconds ] [ -y yearistype ] [ filename ... ]\n"),
435                 progname, progname);
436         (void) exit(EXIT_FAILURE);
437 }
438
439 static const char *     psxrules;
440 static const char *     lcltime;
441 static const char *     directory;
442 static const char *     leapsec;
443 static const char *     yitcommand;
444 static int              sflag = FALSE;
445
446 int
447 main(argc, argv)
448 int     argc;
449 char *  argv[];
450 {
451         register int    i;
452         register int    j;
453         register int    c;
454
455 #ifdef unix
456         (void) umask(umask(S_IWGRP | S_IWOTH) | (S_IWGRP | S_IWOTH));
457 #endif /* defined unix */
458 #if HAVE_GETTEXT - 0
459         (void) setlocale(LC_MESSAGES, "");
460 #ifdef TZ_DOMAINDIR
461         (void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR);
462 #endif /* defined TEXTDOMAINDIR */
463         (void) textdomain(TZ_DOMAIN);
464 #endif /* HAVE_GETTEXT - 0 */
465         progname = argv[0];
466         while ((c = getopt(argc, argv, "d:l:p:L:vsy:")) != EOF)
467                 switch (c) {
468                         default:
469                                 usage();
470                         case 'd':
471                                 if (directory == NULL)
472                                         directory = optarg;
473                                 else {
474                                         (void) fprintf(stderr,
475 _("%s: More than one -d option specified\n"),
476                                                 progname);
477                                         (void) exit(EXIT_FAILURE);
478                                 }
479                                 break;
480                         case 'l':
481                                 if (lcltime == NULL)
482                                         lcltime = optarg;
483                                 else {
484                                         (void) fprintf(stderr,
485 _("%s: More than one -l option specified\n"),
486                                                 progname);
487                                         (void) exit(EXIT_FAILURE);
488                                 }
489                                 break;
490                         case 'p':
491                                 if (psxrules == NULL)
492                                         psxrules = optarg;
493                                 else {
494                                         (void) fprintf(stderr,
495 _("%s: More than one -p option specified\n"),
496                                                 progname);
497                                         (void) exit(EXIT_FAILURE);
498                                 }
499                                 break;
500                         case 'y':
501                                 if (yitcommand == NULL)
502                                         yitcommand = optarg;
503                                 else {
504                                         (void) fprintf(stderr,
505 _("%s: More than one -y option specified\n"),
506                                                 progname);
507                                         (void) exit(EXIT_FAILURE);
508                                 }
509                                 break;
510                         case 'L':
511                                 if (leapsec == NULL)
512                                         leapsec = optarg;
513                                 else {
514                                         (void) fprintf(stderr,
515 _("%s: More than one -L option specified\n"),
516                                                 progname);
517                                         (void) exit(EXIT_FAILURE);
518                                 }
519                                 break;
520                         case 'v':
521                                 noise = TRUE;
522                                 break;
523                         case 's':
524                                 sflag = TRUE;
525                                 break;
526                 }
527         if (optind == argc - 1 && strcmp(argv[optind], "=") == 0)
528                 usage();        /* usage message by request */
529         if (directory == NULL)
530                 directory = TZDIR;
531         if (yitcommand == NULL)
532                 yitcommand = "yearistype";
533
534         setboundaries();
535
536         if (optind < argc && leapsec != NULL) {
537                 infile(leapsec);
538                 adjleap();
539         }
540
541         for (i = optind; i < argc; ++i)
542                 infile(argv[i]);
543         if (errors)
544                 (void) exit(EXIT_FAILURE);
545         associate();
546         for (i = 0; i < nzones; i = j) {
547                 /*
548                 ** Find the next non-continuation zone entry.
549                 */
550                 for (j = i + 1; j < nzones && zones[j].z_name == NULL; ++j)
551                         continue;
552                 outzone(&zones[i], j - i);
553         }
554         /*
555         ** Make links.
556         */
557         for (i = 0; i < nlinks; ++i)
558                 dolink(links[i].l_from, links[i].l_to);
559         if (lcltime != NULL)
560                 dolink(lcltime, TZDEFAULT);
561         if (psxrules != NULL)
562                 dolink(psxrules, TZDEFRULES);
563         return (errors == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
564 }
565
566 static void
567 dolink(fromfile, tofile)
568 const char * const      fromfile;
569 const char * const      tofile;
570 {
571         register char * fromname;
572         register char * toname;
573
574         if (fromfile[0] == '/')
575                 fromname = ecpyalloc(fromfile);
576         else {
577                 fromname = ecpyalloc(directory);
578                 fromname = ecatalloc(fromname, "/");
579                 fromname = ecatalloc(fromname, fromfile);
580         }
581         if (tofile[0] == '/')
582                 toname = ecpyalloc(tofile);
583         else {
584                 toname = ecpyalloc(directory);
585                 toname = ecatalloc(toname, "/");
586                 toname = ecatalloc(toname, tofile);
587         }
588         /*
589         ** We get to be careful here since
590         ** there's a fair chance of root running us.
591         */
592         if (!itsdir(toname))
593                 (void) remove(toname);
594         if (link(fromname, toname) != 0) {
595                 if (mkdirs(toname) != 0)
596                         (void) exit(EXIT_FAILURE);
597                 if (link(fromname, toname) != 0) {
598                         const char *e = strerror(errno);
599                         (void) fprintf(stderr,
600                                 _("%s: Can't link from %s to %s: %s\n"),
601                                 progname, fromname, toname, e);
602                         (void) exit(EXIT_FAILURE);
603                 }
604         }
605         ifree(fromname);
606         ifree(toname);
607 }
608
609 #ifndef INT_MAX
610 #define INT_MAX ((int) (((unsigned)~0)>>1))
611 #endif /* !defined INT_MAX */
612
613 #ifndef INT_MIN
614 #define INT_MIN ((int) ~(((unsigned)~0)>>1))
615 #endif /* !defined INT_MIN */
616
617 /*
618 ** The tz file format currently allows at most 32-bit quantities.
619 ** This restriction should be removed before signed 32-bit values
620 ** wrap around in 2038, but unfortunately this will require a
621 ** change to the tz file format.
622 */
623
624 #define MAX_BITS_IN_FILE        32
625 #define TIME_T_BITS_IN_FILE     ((TYPE_BIT(time_t) < MAX_BITS_IN_FILE) ? \
626                                         TYPE_BIT(time_t) : MAX_BITS_IN_FILE)
627
628 static void
629 setboundaries P((void))
630 {
631         if (TYPE_SIGNED(time_t)) {
632                 min_time = ~ (time_t) 0;
633                 min_time <<= TIME_T_BITS_IN_FILE - 1;
634                 max_time = ~ (time_t) 0 - min_time;
635                 if (sflag)
636                         min_time = 0;
637         } else {
638                 min_time = 0;
639                 max_time = 2 - sflag;
640                 max_time <<= TIME_T_BITS_IN_FILE - 1;
641                 --max_time;
642         }
643         min_year = TM_YEAR_BASE + gmtime(&min_time)->tm_year;
644         max_year = TM_YEAR_BASE + gmtime(&max_time)->tm_year;
645 }
646
647 static int
648 itsdir(name)
649 const char * const      name;
650 {
651         register char * myname;
652         register int    accres;
653
654         myname = ecpyalloc(name);
655         myname = ecatalloc(myname, "/.");
656         accres = access(myname, F_OK);
657         ifree(myname);
658         return accres == 0;
659 }
660
661 /*
662 ** Associate sets of rules with zones.
663 */
664
665 /*
666 ** Sort by rule name.
667 */
668
669 static int
670 rcomp(cp1, cp2)
671 const void *    cp1;
672 const void *    cp2;
673 {
674         return strcmp(((const struct rule *) cp1)->r_name,
675                 ((const struct rule *) cp2)->r_name);
676 }
677
678 static void
679 associate P((void))
680 {
681         register struct zone *  zp;
682         register struct rule *  rp;
683         register int            base, out;
684         register int            i;
685
686         if (nrules != 0)
687                 (void) qsort((void *) rules, (size_t) nrules,
688                         (size_t) sizeof *rules, rcomp);
689         for (i = 0; i < nzones; ++i) {
690                 zp = &zones[i];
691                 zp->z_rules = NULL;
692                 zp->z_nrules = 0;
693         }
694         for (base = 0; base < nrules; base = out) {
695                 rp = &rules[base];
696                 for (out = base + 1; out < nrules; ++out)
697                         if (strcmp(rp->r_name, rules[out].r_name) != 0)
698                                 break;
699                 for (i = 0; i < nzones; ++i) {
700                         zp = &zones[i];
701                         if (strcmp(zp->z_rule, rp->r_name) != 0)
702                                 continue;
703                         zp->z_rules = rp;
704                         zp->z_nrules = out - base;
705                 }
706         }
707         for (i = 0; i < nzones; ++i) {
708                 zp = &zones[i];
709                 if (zp->z_nrules == 0) {
710                         /*
711                         ** Maybe we have a local standard time offset.
712                         */
713                         eat(zp->z_filename, zp->z_linenum);
714                         zp->z_stdoff = gethms(zp->z_rule, _("unruly zone"),
715                                               TRUE);
716                         /*
717                         ** Note, though, that if there's no rule,
718                         ** a '%s' in the format is a bad thing.
719                         */
720                         if (strchr(zp->z_format, '%') != 0)
721                                 error(_("%s in ruleless zone"));
722                 }
723         }
724         if (errors)
725                 (void) exit(EXIT_FAILURE);
726 }
727
728 static void
729 infile(name)
730 const char *    name;
731 {
732         register FILE *                 fp;
733         register char **                fields;
734         register char *                 cp;
735         register const struct lookup *  lp;
736         register int                    nfields;
737         register int                    wantcont;
738         register int                    num;
739         char                            buf[BUFSIZ];
740
741         if (strcmp(name, "-") == 0) {
742                 name = _("standard input");
743                 fp = stdin;
744         } else if ((fp = fopen(name, "r")) == NULL) {
745                 const char *e = strerror(errno);
746                 (void) fprintf(stderr, _("%s: Can't open %s: %s\n"),
747                         progname, name, e);
748                 (void) exit(EXIT_FAILURE);
749         }
750         wantcont = FALSE;
751         for (num = 1; ; ++num) {
752                 eat(name, num);
753                 if (fgets(buf, (int) sizeof buf, fp) != buf)
754                         break;
755                 cp = strchr(buf, '\n');
756                 if (cp == NULL) {
757                         error(_("line too long"));
758                         (void) exit(EXIT_FAILURE);
759                 }
760                 *cp = '\0';
761                 fields = getfields(buf);
762                 nfields = 0;
763                 while (fields[nfields] != NULL) {
764                         static char     nada;
765
766                         if (strcmp(fields[nfields], "-") == 0)
767                                 fields[nfields] = &nada;
768                         ++nfields;
769                 }
770                 if (nfields == 0) {
771                         /* nothing to do */
772                 } else if (wantcont) {
773                         wantcont = inzcont(fields, nfields);
774                 } else {
775                         lp = byword(fields[0], line_codes);
776                         if (lp == NULL)
777                                 error(_("input line of unknown type"));
778                         else switch ((int) (lp->l_value)) {
779                                 case LC_RULE:
780                                         inrule(fields, nfields);
781                                         wantcont = FALSE;
782                                         break;
783                                 case LC_ZONE:
784                                         wantcont = inzone(fields, nfields);
785                                         break;
786                                 case LC_LINK:
787                                         inlink(fields, nfields);
788                                         wantcont = FALSE;
789                                         break;
790                                 case LC_LEAP:
791                                         if (name != leapsec)
792                                                 (void) fprintf(stderr,
793 _("%s: Leap line in non leap seconds file %s\n"),
794                                                         progname, name);
795                                         else    inleap(fields, nfields);
796                                         wantcont = FALSE;
797                                         break;
798                                 default:        /* "cannot happen" */
799                                         (void) fprintf(stderr,
800 _("%s: panic: Invalid l_value %d\n"),
801                                                 progname, lp->l_value);
802                                         (void) exit(EXIT_FAILURE);
803                         }
804                 }
805                 ifree((char *) fields);
806         }
807         if (ferror(fp)) {
808                 (void) fprintf(stderr, _("%s: Error reading %s\n"),
809                         progname, filename);
810                 (void) exit(EXIT_FAILURE);
811         }
812         if (fp != stdin && fclose(fp)) {
813                 const char *e = strerror(errno);
814                 (void) fprintf(stderr, _("%s: Error closing %s: %s\n"),
815                         progname, filename, e);
816                 (void) exit(EXIT_FAILURE);
817         }
818         if (wantcont)
819                 error(_("expected continuation line not found"));
820 }
821
822 /*
823 ** Convert a string of one of the forms
824 **      h       -h      hh:mm   -hh:mm  hh:mm:ss        -hh:mm:ss
825 ** into a number of seconds.
826 ** A null string maps to zero.
827 ** Call error with errstring and return zero on errors.
828 */
829
830 static long
831 gethms(string, errstring, signable)
832 const char *            string;
833 const char * const      errstring;
834 const int               signable;
835 {
836         int     hh, mm, ss, sign;
837
838         if (string == NULL || *string == '\0')
839                 return 0;
840         if (!signable)
841                 sign = 1;
842         else if (*string == '-') {
843                 sign = -1;
844                 ++string;
845         } else  sign = 1;
846         if (sscanf(string, scheck(string, "%d"), &hh) == 1)
847                 mm = ss = 0;
848         else if (sscanf(string, scheck(string, "%d:%d"), &hh, &mm) == 2)
849                 ss = 0;
850         else if (sscanf(string, scheck(string, "%d:%d:%d"),
851                 &hh, &mm, &ss) != 3) {
852                         error(errstring);
853                         return 0;
854         }
855         if (hh < 0 || hh >= HOURSPERDAY ||
856                 mm < 0 || mm >= MINSPERHOUR ||
857                 ss < 0 || ss > SECSPERMIN) {
858                         error(errstring);
859                         return 0;
860         }
861         return eitol(sign) *
862                 (eitol(hh * MINSPERHOUR + mm) *
863                 eitol(SECSPERMIN) + eitol(ss));
864 }
865
866 static void
867 inrule(fields, nfields)
868 register char ** const  fields;
869 const int               nfields;
870 {
871         static struct rule      r;
872
873         if (nfields != RULE_FIELDS) {
874                 error(_("wrong number of fields on Rule line"));
875                 return;
876         }
877         if (*fields[RF_NAME] == '\0') {
878                 error(_("nameless rule"));
879                 return;
880         }
881         r.r_filename = filename;
882         r.r_linenum = linenum;
883         r.r_stdoff = gethms(fields[RF_STDOFF], _("invalid saved time"), TRUE);
884         rulesub(&r, fields[RF_LOYEAR], fields[RF_HIYEAR], fields[RF_COMMAND],
885                 fields[RF_MONTH], fields[RF_DAY], fields[RF_TOD]);
886         r.r_name = ecpyalloc(fields[RF_NAME]);
887         r.r_abbrvar = ecpyalloc(fields[RF_ABBRVAR]);
888         rules = (struct rule *) (void *) erealloc((char *) rules,
889                 (int) ((nrules + 1) * sizeof *rules));
890         rules[nrules++] = r;
891 }
892
893 static int
894 inzone(fields, nfields)
895 register char ** const  fields;
896 const int               nfields;
897 {
898         register int    i;
899         static char *   buf;
900
901         if (nfields < ZONE_MINFIELDS || nfields > ZONE_MAXFIELDS) {
902                 error(_("wrong number of fields on Zone line"));
903                 return FALSE;
904         }
905         if (strcmp(fields[ZF_NAME], TZDEFAULT) == 0 && lcltime != NULL) {
906                 buf = erealloc(buf, (int) (132 + strlen(TZDEFAULT)));
907                 (void) sprintf(buf,
908 _("\"Zone %s\" line and -l option are mutually exclusive"),
909                         TZDEFAULT);
910                 error(buf);
911                 return FALSE;
912         }
913         if (strcmp(fields[ZF_NAME], TZDEFRULES) == 0 && psxrules != NULL) {
914                 buf = erealloc(buf, (int) (132 + strlen(TZDEFRULES)));
915                 (void) sprintf(buf,
916 _("\"Zone %s\" line and -p option are mutually exclusive"),
917                         TZDEFRULES);
918                 error(buf);
919                 return FALSE;
920         }
921         for (i = 0; i < nzones; ++i)
922                 if (zones[i].z_name != NULL &&
923                         strcmp(zones[i].z_name, fields[ZF_NAME]) == 0) {
924                                 buf = erealloc(buf, (int) (132 +
925                                         strlen(fields[ZF_NAME]) +
926                                         strlen(zones[i].z_filename)));
927                                 (void) sprintf(buf,
928 _("duplicate zone name %s (file \"%s\", line %d)"),
929                                         fields[ZF_NAME],
930                                         zones[i].z_filename,
931                                         zones[i].z_linenum);
932                                 error(buf);
933                                 return FALSE;
934                 }
935         return inzsub(fields, nfields, FALSE);
936 }
937
938 static int
939 inzcont(fields, nfields)
940 register char ** const  fields;
941 const int               nfields;
942 {
943         if (nfields < ZONEC_MINFIELDS || nfields > ZONEC_MAXFIELDS) {
944                 error(_("wrong number of fields on Zone continuation line"));
945                 return FALSE;
946         }
947         return inzsub(fields, nfields, TRUE);
948 }
949
950 static int
951 inzsub(fields, nfields, iscont)
952 register char ** const  fields;
953 const int               nfields;
954 const int               iscont;
955 {
956         register char *         cp;
957         static struct zone      z;
958         register int            i_gmtoff, i_rule, i_format;
959         register int            i_untilyear, i_untilmonth;
960         register int            i_untilday, i_untiltime;
961         register int            hasuntil;
962
963         if (iscont) {
964                 i_gmtoff = ZFC_GMTOFF;
965                 i_rule = ZFC_RULE;
966                 i_format = ZFC_FORMAT;
967                 i_untilyear = ZFC_TILYEAR;
968                 i_untilmonth = ZFC_TILMONTH;
969                 i_untilday = ZFC_TILDAY;
970                 i_untiltime = ZFC_TILTIME;
971                 z.z_name = NULL;
972         } else {
973                 i_gmtoff = ZF_GMTOFF;
974                 i_rule = ZF_RULE;
975                 i_format = ZF_FORMAT;
976                 i_untilyear = ZF_TILYEAR;
977                 i_untilmonth = ZF_TILMONTH;
978                 i_untilday = ZF_TILDAY;
979                 i_untiltime = ZF_TILTIME;
980                 z.z_name = ecpyalloc(fields[ZF_NAME]);
981         }
982         z.z_filename = filename;
983         z.z_linenum = linenum;
984         z.z_gmtoff = gethms(fields[i_gmtoff], _("invalid GMT offset"), TRUE);
985         if ((cp = strchr(fields[i_format], '%')) != 0) {
986                 if (*++cp != 's' || strchr(cp, '%') != 0) {
987                         error(_("invalid abbreviation format"));
988                         return FALSE;
989                 }
990         }
991         z.z_rule = ecpyalloc(fields[i_rule]);
992         z.z_format = ecpyalloc(fields[i_format]);
993         hasuntil = nfields > i_untilyear;
994         if (hasuntil) {
995                 z.z_untilrule.r_filename = filename;
996                 z.z_untilrule.r_linenum = linenum;
997                 rulesub(&z.z_untilrule,
998                         fields[i_untilyear],
999                         "only",
1000                         "",
1001                         (nfields > i_untilmonth) ?
1002                         fields[i_untilmonth] : "Jan",
1003                         (nfields > i_untilday) ? fields[i_untilday] : "1",
1004                         (nfields > i_untiltime) ? fields[i_untiltime] : "0");
1005                 z.z_untiltime = rpytime(&z.z_untilrule,
1006                         z.z_untilrule.r_loyear);
1007                 if (iscont && nzones > 0 &&
1008                         z.z_untiltime > min_time &&
1009                         z.z_untiltime < max_time &&
1010                         zones[nzones - 1].z_untiltime > min_time &&
1011                         zones[nzones - 1].z_untiltime < max_time &&
1012                         zones[nzones - 1].z_untiltime >= z.z_untiltime) {
1013                                 error(_("Zone continuation line end time is \
1014 not after end time of previous line"));
1015                                 return FALSE;
1016                 }
1017         }
1018         zones = (struct zone *) (void *) erealloc((char *) zones,
1019                 (int) ((nzones + 1) * sizeof *zones));
1020         zones[nzones++] = z;
1021         /*
1022         ** If there was an UNTIL field on this line,
1023         ** there's more information about the zone on the next line.
1024         */
1025         return hasuntil;
1026 }
1027
1028 static void
1029 inleap(fields, nfields)
1030 register char ** const  fields;
1031 const int               nfields;
1032 {
1033         register const char *           cp;
1034         register const struct lookup *  lp;
1035         register int                    i, j;
1036         int                             year, month, day;
1037         long                            dayoff, tod;
1038         time_t                          t;
1039
1040         if (nfields != LEAP_FIELDS) {
1041                 error(_("wrong number of fields on Leap line"));
1042                 return;
1043         }
1044         dayoff = 0;
1045         cp = fields[LP_YEAR];
1046         if (sscanf(cp, scheck(cp, "%d"), &year) != 1) {
1047                         /*
1048                          * Leapin' Lizards!
1049                          */
1050                         error(_("invalid leaping year"));
1051                         return;
1052         }
1053         j = EPOCH_YEAR;
1054         while (j != year) {
1055                 if (year > j) {
1056                         i = len_years[isleap(j)];
1057                         ++j;
1058                 } else {
1059                         --j;
1060                         i = -len_years[isleap(j)];
1061                 }
1062                 dayoff = oadd(dayoff, eitol(i));
1063         }
1064         if ((lp = byword(fields[LP_MONTH], mon_names)) == NULL) {
1065                 error(_("invalid month name"));
1066                 return;
1067         }
1068         month = lp->l_value;
1069         j = TM_JANUARY;
1070         while (j != month) {
1071                 i = len_months[isleap(year)][j];
1072                 dayoff = oadd(dayoff, eitol(i));
1073                 ++j;
1074         }
1075         cp = fields[LP_DAY];
1076         if (sscanf(cp, scheck(cp, "%d"), &day) != 1 ||
1077                 day <= 0 || day > len_months[isleap(year)][month]) {
1078                         error(_("invalid day of month"));
1079                         return;
1080         }
1081         dayoff = oadd(dayoff, eitol(day - 1));
1082         if (dayoff < 0 && !TYPE_SIGNED(time_t)) {
1083                 error(_("time before zero"));
1084                 return;
1085         }
1086         t = (time_t) dayoff * SECSPERDAY;
1087         /*
1088         ** Cheap overflow check.
1089         */
1090         if (t / SECSPERDAY != dayoff) {
1091                 error(_("time overflow"));
1092                 return;
1093         }
1094         tod = gethms(fields[LP_TIME], _("invalid time of day"), FALSE);
1095         cp = fields[LP_CORR];
1096         {
1097                 register int    positive;
1098                 int             count;
1099
1100                 if (strcmp(cp, "") == 0) { /* infile() turns "-" into "" */
1101                         positive = FALSE;
1102                         count = 1;
1103                 } else if (strcmp(cp, "--") == 0) {
1104                         positive = FALSE;
1105                         count = 2;
1106                 } else if (strcmp(cp, "+") == 0) {
1107                         positive = TRUE;
1108                         count = 1;
1109                 } else if (strcmp(cp, "++") == 0) {
1110                         positive = TRUE;
1111                         count = 2;
1112                 } else {
1113                         error(_("illegal CORRECTION field on Leap line"));
1114                         return;
1115                 }
1116                 if ((lp = byword(fields[LP_ROLL], leap_types)) == NULL) {
1117                         error(_("illegal Rolling/Stationary field on Leap line"));
1118                         return;
1119                 }
1120                 leapadd(tadd(t, tod), positive, lp->l_value, count);
1121         }
1122 }
1123
1124 static void
1125 inlink(fields, nfields)
1126 register char ** const  fields;
1127 const int               nfields;
1128 {
1129         struct link     l;
1130
1131         if (nfields != LINK_FIELDS) {
1132                 error(_("wrong number of fields on Link line"));
1133                 return;
1134         }
1135         if (*fields[LF_FROM] == '\0') {
1136                 error(_("blank FROM field on Link line"));
1137                 return;
1138         }
1139         if (*fields[LF_TO] == '\0') {
1140                 error(_("blank TO field on Link line"));
1141                 return;
1142         }
1143         l.l_filename = filename;
1144         l.l_linenum = linenum;
1145         l.l_from = ecpyalloc(fields[LF_FROM]);
1146         l.l_to = ecpyalloc(fields[LF_TO]);
1147         links = (struct link *) (void *) erealloc((char *) links,
1148                 (int) ((nlinks + 1) * sizeof *links));
1149         links[nlinks++] = l;
1150 }
1151
1152 static void
1153 rulesub(rp, loyearp, hiyearp, typep, monthp, dayp, timep)
1154 register struct rule * const    rp;
1155 const char * const              loyearp;
1156 const char * const              hiyearp;
1157 const char * const              typep;
1158 const char * const              monthp;
1159 const char * const              dayp;
1160 const char * const              timep;
1161 {
1162         register const struct lookup *  lp;
1163         register const char *           cp;
1164         register char *                 dp;
1165         register char *                 ep;
1166
1167         if ((lp = byword(monthp, mon_names)) == NULL) {
1168                 error(_("invalid month name"));
1169                 return;
1170         }
1171         rp->r_month = lp->l_value;
1172         rp->r_todisstd = FALSE;
1173         rp->r_todisgmt = FALSE;
1174         dp = ecpyalloc(timep);
1175         if (*dp != '\0') {
1176                 ep = dp + strlen(dp) - 1;
1177                 switch (lowerit(*ep)) {
1178                         case 's':       /* Standard */
1179                                 rp->r_todisstd = TRUE;
1180                                 rp->r_todisgmt = FALSE;
1181                                 *ep = '\0';
1182                                 break;
1183                         case 'w':       /* Wall */
1184                                 rp->r_todisstd = FALSE;
1185                                 rp->r_todisgmt = FALSE;
1186                                 *ep = '\0';
1187                         case 'g':       /* Greenwich */
1188                         case 'u':       /* Universal */
1189                         case 'z':       /* Zulu */
1190                                 rp->r_todisstd = TRUE;
1191                                 rp->r_todisgmt = TRUE;
1192                                 *ep = '\0';
1193                                 break;
1194                 }
1195         }
1196         rp->r_tod = gethms(dp, _("invalid time of day"), FALSE);
1197         ifree(dp);
1198         /*
1199         ** Year work.
1200         */
1201         cp = loyearp;
1202         lp = byword(cp, begin_years);
1203         if (lp != NULL) switch ((int) lp->l_value) {
1204                 case YR_MINIMUM:
1205                         rp->r_loyear = INT_MIN;
1206                         break;
1207                 case YR_MAXIMUM:
1208                         rp->r_loyear = INT_MAX;
1209                         break;
1210                 default:        /* "cannot happen" */
1211                         (void) fprintf(stderr,
1212                                 _("%s: panic: Invalid l_value %d\n"),
1213                                 progname, lp->l_value);
1214                         (void) exit(EXIT_FAILURE);
1215         } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_loyear) != 1) {
1216                 error(_("invalid starting year"));
1217                 return;
1218         }
1219         cp = hiyearp;
1220         if ((lp = byword(cp, end_years)) != NULL) switch ((int) lp->l_value) {
1221                 case YR_MINIMUM:
1222                         rp->r_hiyear = INT_MIN;
1223                         break;
1224                 case YR_MAXIMUM:
1225                         rp->r_hiyear = INT_MAX;
1226                         break;
1227                 case YR_ONLY:
1228                         rp->r_hiyear = rp->r_loyear;
1229                         break;
1230                 default:        /* "cannot happen" */
1231                         (void) fprintf(stderr,
1232                                 _("%s: panic: Invalid l_value %d\n"),
1233                                 progname, lp->l_value);
1234                         (void) exit(EXIT_FAILURE);
1235         } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_hiyear) != 1) {
1236                 error(_("invalid ending year"));
1237                 return;
1238         }
1239         if (rp->r_loyear > rp->r_hiyear) {
1240                 error(_("starting year greater than ending year"));
1241                 return;
1242         }
1243         if (*typep == '\0')
1244                 rp->r_yrtype = NULL;
1245         else {
1246                 if (rp->r_loyear == rp->r_hiyear) {
1247                         error(_("typed single year"));
1248                         return;
1249                 }
1250                 rp->r_yrtype = ecpyalloc(typep);
1251         }
1252         /*
1253         ** Day work.
1254         ** Accept things such as:
1255         **      1
1256         **      last-Sunday
1257         **      Sun<=20
1258         **      Sun>=7
1259         */
1260         dp = ecpyalloc(dayp);
1261         if ((lp = byword(dp, lasts)) != NULL) {
1262                 rp->r_dycode = DC_DOWLEQ;
1263                 rp->r_wday = lp->l_value;
1264                 rp->r_dayofmonth = len_months[1][rp->r_month];
1265         } else {
1266                 if ((ep = strchr(dp, '<')) != 0)
1267                         rp->r_dycode = DC_DOWLEQ;
1268                 else if ((ep = strchr(dp, '>')) != 0)
1269                         rp->r_dycode = DC_DOWGEQ;
1270                 else {
1271                         ep = dp;
1272                         rp->r_dycode = DC_DOM;
1273                 }
1274                 if (rp->r_dycode != DC_DOM) {
1275                         *ep++ = 0;
1276                         if (*ep++ != '=') {
1277                                 error(_("invalid day of month"));
1278                                 ifree(dp);
1279                                 return;
1280                         }
1281                         if ((lp = byword(dp, wday_names)) == NULL) {
1282                                 error(_("invalid weekday name"));
1283                                 ifree(dp);
1284                                 return;
1285                         }
1286                         rp->r_wday = lp->l_value;
1287                 }
1288                 if (sscanf(ep, scheck(ep, "%d"), &rp->r_dayofmonth) != 1 ||
1289                         rp->r_dayofmonth <= 0 ||
1290                         (rp->r_dayofmonth > len_months[1][rp->r_month])) {
1291                                 error(_("invalid day of month"));
1292                                 ifree(dp);
1293                                 return;
1294                 }
1295         }
1296         ifree(dp);
1297 }
1298
1299 static void
1300 convert(val, buf)
1301 const long      val;
1302 char * const    buf;
1303 {
1304         register int    i;
1305         register long   shift;
1306
1307         for (i = 0, shift = 24; i < 4; ++i, shift -= 8)
1308                 buf[i] = val >> shift;
1309 }
1310
1311 static void
1312 puttzcode(val, fp)
1313 const long      val;
1314 FILE * const    fp;
1315 {
1316         char    buf[4];
1317
1318         convert(val, buf);
1319         (void) fwrite((void *) buf, (size_t) sizeof buf, (size_t) 1, fp);
1320 }
1321
1322 static void
1323 writezone(name)
1324 const char * const      name;
1325 {
1326         register FILE *         fp;
1327         register int            i, j;
1328         static char *           fullname;
1329         static struct tzhead    tzh;
1330
1331         fullname = erealloc(fullname,
1332                 (int) (strlen(directory) + 1 + strlen(name) + 1));
1333         (void) sprintf(fullname, "%s/%s", directory, name);
1334         if ((fp = fopen(fullname, "wb")) == NULL) {
1335                 if (mkdirs(fullname) != 0)
1336                         (void) exit(EXIT_FAILURE);
1337                 if ((fp = fopen(fullname, "wb")) == NULL) {
1338                         const char *e = strerror(errno);
1339                         (void) fprintf(stderr, _("%s: Can't create %s: %s\n"),
1340                                 progname, fullname, e);
1341                         (void) exit(EXIT_FAILURE);
1342                 }
1343         }
1344         convert(eitol(typecnt), tzh.tzh_ttisgmtcnt);
1345         convert(eitol(typecnt), tzh.tzh_ttisstdcnt);
1346         convert(eitol(leapcnt), tzh.tzh_leapcnt);
1347         convert(eitol(timecnt), tzh.tzh_timecnt);
1348         convert(eitol(typecnt), tzh.tzh_typecnt);
1349         convert(eitol(charcnt), tzh.tzh_charcnt);
1350 #define DO(field)       (void) fwrite((void *) tzh.field, \
1351                 (size_t) sizeof tzh.field, (size_t) 1, fp)
1352         DO(tzh_reserved);
1353         DO(tzh_ttisgmtcnt);
1354         DO(tzh_ttisstdcnt);
1355         DO(tzh_leapcnt);
1356         DO(tzh_timecnt);
1357         DO(tzh_typecnt);
1358         DO(tzh_charcnt);
1359 #undef DO
1360         for (i = 0; i < timecnt; ++i) {
1361                 j = leapcnt;
1362                 while (--j >= 0)
1363                         if (ats[i] >= trans[j]) {
1364                                 ats[i] = tadd(ats[i], corr[j]);
1365                                 break;
1366                         }
1367                 puttzcode((long) ats[i], fp);
1368         }
1369         if (timecnt > 0)
1370                 (void) fwrite((void *) types, (size_t) sizeof types[0],
1371                         (size_t) timecnt, fp);
1372         for (i = 0; i < typecnt; ++i) {
1373                 puttzcode((long) gmtoffs[i], fp);
1374                 (void) putc(isdsts[i], fp);
1375                 (void) putc(abbrinds[i], fp);
1376         }
1377         if (charcnt != 0)
1378                 (void) fwrite((void *) chars, (size_t) sizeof chars[0],
1379                         (size_t) charcnt, fp);
1380         for (i = 0; i < leapcnt; ++i) {
1381                 if (roll[i]) {
1382                         if (timecnt == 0 || trans[i] < ats[0]) {
1383                                 j = 0;
1384                                 while (isdsts[j])
1385                                         if (++j >= typecnt) {
1386                                                 j = 0;
1387                                                 break;
1388                                         }
1389                         } else {
1390                                 j = 1;
1391                                 while (j < timecnt && trans[i] >= ats[j])
1392                                         ++j;
1393                                 j = types[j - 1];
1394                         }
1395                         puttzcode((long) tadd(trans[i], -gmtoffs[j]), fp);
1396                 } else  puttzcode((long) trans[i], fp);
1397                 puttzcode((long) corr[i], fp);
1398         }
1399         for (i = 0; i < typecnt; ++i)
1400                 (void) putc(ttisstds[i], fp);
1401         for (i = 0; i < typecnt; ++i)
1402                 (void) putc(ttisgmts[i], fp);
1403         if (ferror(fp) || fclose(fp)) {
1404                 (void) fprintf(stderr, _("%s: Error writing %s\n"),
1405                         progname, fullname);
1406                 (void) exit(EXIT_FAILURE);
1407         }
1408 }
1409
1410 static void
1411 doabbr(abbr, format, letters, isdst)
1412 char * const            abbr;
1413 const char * const      format;
1414 const char * const      letters;
1415 const int               isdst;
1416 {
1417         if (strchr(format, '/') == NULL) {
1418                 if (letters == NULL)
1419                         (void) strcpy(abbr, format);
1420                 else    (void) sprintf(abbr, format, letters);
1421         } else if (isdst)
1422                 (void) strcpy(abbr, strchr(format, '/') + 1);
1423         else {
1424                 (void) strcpy(abbr, format);
1425                 *strchr(abbr, '/') = '\0';
1426         }
1427 }
1428
1429 static void
1430 outzone(zpfirst, zonecount)
1431 const struct zone * const       zpfirst;
1432 const int                       zonecount;
1433 {
1434         register const struct zone *    zp;
1435         register struct rule *          rp;
1436         register int                    i, j;
1437         register int                    usestart, useuntil;
1438         register time_t                 starttime, untiltime;
1439         register long                   gmtoff;
1440         register long                   stdoff;
1441         register int                    year;
1442         register long                   startoff;
1443         register int                    startisdst;
1444         register int                    startttisstd;
1445         register int                    startttisgmt;
1446         register int                    type;
1447         char                            startbuf[BUFSIZ];
1448
1449         INITIALIZE(untiltime);
1450         INITIALIZE(starttime);
1451         INITIALIZE(startoff);
1452         /*
1453         ** Now. . .finally. . .generate some useful data!
1454         */
1455         timecnt = 0;
1456         typecnt = 0;
1457         charcnt = 0;
1458         /*
1459         ** A guess that may well be corrected later.
1460         */
1461         stdoff = 0;
1462         /*
1463         ** Thanks to Earl Chew (earl@dnd.icp.nec.com.au)
1464         ** for noting the need to unconditionally initialize startttisstd.
1465         */
1466         startttisstd = FALSE;
1467         startttisgmt = FALSE;
1468         for (i = 0; i < zonecount; ++i) {
1469                 zp = &zpfirst[i];
1470                 usestart = i > 0 && (zp - 1)->z_untiltime > min_time;
1471                 useuntil = i < (zonecount - 1);
1472                 if (useuntil && zp->z_untiltime <= min_time)
1473                         continue;
1474                 gmtoff = zp->z_gmtoff;
1475                 eat(zp->z_filename, zp->z_linenum);
1476                 startisdst = -1;
1477                 if (zp->z_nrules == 0) {
1478                         stdoff = zp->z_stdoff;
1479                         doabbr(startbuf, zp->z_format,
1480                                 (char *) NULL, stdoff != 0);
1481                         type = addtype(oadd(zp->z_gmtoff, stdoff),
1482                                 startbuf, stdoff != 0, startttisstd,
1483                                 startttisgmt);
1484                         if (usestart)
1485                                 addtt(starttime, type);
1486                         else if (stdoff != 0)
1487                                 addtt(min_time, type);
1488                 } else for (year = min_year; year <= max_year; ++year) {
1489                         if (useuntil && year > zp->z_untilrule.r_hiyear)
1490                                 break;
1491                         /*
1492                         ** Mark which rules to do in the current year.
1493                         ** For those to do, calculate rpytime(rp, year);
1494                         */
1495                         for (j = 0; j < zp->z_nrules; ++j) {
1496                                 rp = &zp->z_rules[j];
1497                                 eats(zp->z_filename, zp->z_linenum,
1498                                         rp->r_filename, rp->r_linenum);
1499                                 rp->r_todo = year >= rp->r_loyear &&
1500                                                 year <= rp->r_hiyear &&
1501                                                 yearistype(year, rp->r_yrtype);
1502                                 if (rp->r_todo)
1503                                         rp->r_temp = rpytime(rp, year);
1504                         }
1505                         for ( ; ; ) {
1506                                 register int    k;
1507                                 register time_t jtime, ktime;
1508                                 register long   offset;
1509                                 char            buf[BUFSIZ];
1510
1511                                 INITIALIZE(ktime);
1512                                 if (useuntil) {
1513                                         /*
1514                                         ** Turn untiltime into GMT
1515                                         ** assuming the current gmtoff and
1516                                         ** stdoff values.
1517                                         */
1518                                         untiltime = zp->z_untiltime;
1519                                         if (!zp->z_untilrule.r_todisgmt)
1520                                                 untiltime = tadd(untiltime,
1521                                                         -gmtoff);
1522                                         if (!zp->z_untilrule.r_todisstd)
1523                                                 untiltime = tadd(untiltime,
1524                                                         -stdoff);
1525                                 }
1526                                 /*
1527                                 ** Find the rule (of those to do, if any)
1528                                 ** that takes effect earliest in the year.
1529                                 */
1530                                 k = -1;
1531                                 for (j = 0; j < zp->z_nrules; ++j) {
1532                                         rp = &zp->z_rules[j];
1533                                         if (!rp->r_todo)
1534                                                 continue;
1535                                         eats(zp->z_filename, zp->z_linenum,
1536                                                 rp->r_filename, rp->r_linenum);
1537                                         offset = rp->r_todisgmt ? 0 : gmtoff;
1538                                         if (!rp->r_todisstd)
1539                                                 offset = oadd(offset, stdoff);
1540                                         jtime = rp->r_temp;
1541                                         if (jtime == min_time ||
1542                                                 jtime == max_time)
1543                                                         continue;
1544                                         jtime = tadd(jtime, -offset);
1545                                         if (k < 0 || jtime < ktime) {
1546                                                 k = j;
1547                                                 ktime = jtime;
1548                                         }
1549                                 }
1550                                 if (k < 0)
1551                                         break;  /* go on to next year */
1552                                 rp = &zp->z_rules[k];
1553                                 rp->r_todo = FALSE;
1554                                 if (useuntil && ktime >= untiltime)
1555                                         break;
1556                                 if (usestart) {
1557                                     if (ktime < starttime) {
1558                                         stdoff = rp->r_stdoff;
1559                                         startoff = oadd(zp->z_gmtoff,
1560                                                 rp->r_stdoff);
1561                                         doabbr(startbuf, zp->z_format,
1562                                                 rp->r_abbrvar,
1563                                                 rp->r_stdoff != 0);
1564                                         startisdst = rp->r_stdoff != 0;
1565                                         continue;
1566                                     }
1567                                     usestart = FALSE;
1568                                     if (ktime != starttime) {
1569                                         if (startisdst < 0 &&
1570                                             zp->z_gmtoff !=
1571                                             (zp - 1)->z_gmtoff) {
1572                                                 type = (timecnt == 0) ? 0 :
1573                                                         types[timecnt - 1];
1574                                                 startoff = oadd(gmtoffs[type],
1575                                                         -(zp - 1)->z_gmtoff);
1576                                                 startisdst = startoff != 0;
1577                                                 startoff = oadd(startoff,
1578                                                         zp->z_gmtoff);
1579                                                 (void) strcpy(startbuf,
1580                                                     &chars[abbrinds[type]]);
1581                                         }
1582                                         if (startisdst >= 0)
1583 addtt(starttime, addtype(startoff, startbuf, startisdst, startttisstd,
1584         startttisgmt));
1585                                     }
1586                                 }
1587                                 eats(zp->z_filename, zp->z_linenum,
1588                                         rp->r_filename, rp->r_linenum);
1589                                 doabbr(buf, zp->z_format, rp->r_abbrvar,
1590                                         rp->r_stdoff != 0);
1591                                 offset = oadd(zp->z_gmtoff, rp->r_stdoff);
1592                                 type = addtype(offset, buf, rp->r_stdoff != 0,
1593                                         rp->r_todisstd, rp->r_todisgmt);
1594                                 addtt(ktime, type);
1595                                 stdoff = rp->r_stdoff;
1596                         }
1597                 }
1598                 /*
1599                 ** Now we may get to set starttime for the next zone line.
1600                 */
1601                 if (useuntil) {
1602                         starttime = tadd(zp->z_untiltime, -gmtoff);
1603                         startttisstd = zp->z_untilrule.r_todisstd;
1604                         startttisgmt = zp->z_untilrule.r_todisgmt;
1605                         if (!startttisstd)
1606                                 starttime = tadd(starttime, -stdoff);
1607                 }
1608         }
1609         writezone(zpfirst->z_name);
1610 }
1611
1612 static void
1613 addtt(starttime, type)
1614 const time_t    starttime;
1615 const int       type;
1616 {
1617         if (timecnt != 0 && type == types[timecnt - 1])
1618                 return; /* easy enough! */
1619         if (timecnt == 0 && type == 0 && isdsts[0] == 0)
1620                 return; /* handled by default rule */
1621         if (timecnt >= TZ_MAX_TIMES) {
1622                 error(_("too many transitions?!"));
1623                 (void) exit(EXIT_FAILURE);
1624         }
1625         ats[timecnt] = starttime;
1626         types[timecnt] = type;
1627         ++timecnt;
1628 }
1629
1630 static int
1631 addtype(gmtoff, abbr, isdst, ttisstd, ttisgmt)
1632 const long              gmtoff;
1633 const char * const      abbr;
1634 const int               isdst;
1635 const int               ttisstd;
1636 const int               ttisgmt;
1637 {
1638         register int    i, j;
1639
1640         /*
1641         ** See if there's already an entry for this zone type.
1642         ** If so, just return its index.
1643         */
1644         for (i = 0; i < typecnt; ++i) {
1645                 if (gmtoff == gmtoffs[i] && isdst == isdsts[i] &&
1646                         strcmp(abbr, &chars[abbrinds[i]]) == 0 &&
1647                         ttisstd == ttisstds[i] &&
1648                         ttisgmt == ttisgmts[i])
1649                                 return i;
1650         }
1651         /*
1652         ** There isn't one; add a new one, unless there are already too
1653         ** many.
1654         */
1655         if (typecnt >= TZ_MAX_TYPES) {
1656                 error(_("too many local time types"));
1657                 (void) exit(EXIT_FAILURE);
1658         }
1659         gmtoffs[i] = gmtoff;
1660         isdsts[i] = isdst;
1661         ttisstds[i] = ttisstd;
1662         ttisgmts[i] = ttisgmt;
1663
1664         for (j = 0; j < charcnt; ++j)
1665                 if (strcmp(&chars[j], abbr) == 0)
1666                         break;
1667         if (j == charcnt)
1668                 newabbr(abbr);
1669         abbrinds[i] = j;
1670         ++typecnt;
1671         return i;
1672 }
1673
1674 static void
1675 leapadd(t, positive, rolling, count)
1676 const time_t    t;
1677 const int       positive;
1678 const int       rolling;
1679 int             count;
1680 {
1681         register int    i, j;
1682
1683         if (leapcnt + (positive ? count : 1) > TZ_MAX_LEAPS) {
1684                 error(_("too many leap seconds"));
1685                 (void) exit(EXIT_FAILURE);
1686         }
1687         for (i = 0; i < leapcnt; ++i)
1688                 if (t <= trans[i]) {
1689                         if (t == trans[i]) {
1690                                 error(_("repeated leap second moment"));
1691                                 (void) exit(EXIT_FAILURE);
1692                         }
1693                         break;
1694                 }
1695         do {
1696                 for (j = leapcnt; j > i; --j) {
1697                         trans[j] = trans[j - 1];
1698                         corr[j] = corr[j - 1];
1699                         roll[j] = roll[j - 1];
1700                 }
1701                 trans[i] = t;
1702                 corr[i] = positive ? 1L : eitol(-count);
1703                 roll[i] = rolling;
1704                 ++leapcnt;
1705         } while (positive && --count != 0);
1706 }
1707
1708 static void
1709 adjleap P((void))
1710 {
1711         register int    i;
1712         register long   last = 0;
1713
1714         /*
1715         ** propagate leap seconds forward
1716         */
1717         for (i = 0; i < leapcnt; ++i) {
1718                 trans[i] = tadd(trans[i], last);
1719                 last = corr[i] += last;
1720         }
1721 }
1722
1723 static int
1724 yearistype(year, type)
1725 const int               year;
1726 const char * const      type;
1727 {
1728         static char *   buf;
1729         int             result;
1730
1731         if (type == NULL || *type == '\0')
1732                 return TRUE;
1733         buf = erealloc(buf, (int) (132 + strlen(yitcommand) + strlen(type)));
1734         (void) sprintf(buf, "%s %d %s", yitcommand, year, type);
1735         result = system(buf);
1736         if (result == 0)
1737                 return TRUE;
1738         if (result == (1 << 8))
1739                 return FALSE;
1740         error(_("Wild result from command execution"));
1741         (void) fprintf(stderr, _("%s: command was '%s', result was %d\n"),
1742                 progname, buf, result);
1743         for ( ; ; )
1744                 (void) exit(EXIT_FAILURE);
1745 }
1746
1747 static int
1748 lowerit(a)
1749 int     a;
1750 {
1751         a = (unsigned char) a;
1752         return (isascii(a) && isupper(a)) ? tolower(a) : a;
1753 }
1754
1755 static int
1756 ciequal(ap, bp)         /* case-insensitive equality */
1757 register const char *   ap;
1758 register const char *   bp;
1759 {
1760         while (lowerit(*ap) == lowerit(*bp++))
1761                 if (*ap++ == '\0')
1762                         return TRUE;
1763         return FALSE;
1764 }
1765
1766 static int
1767 itsabbr(abbr, word)
1768 register const char *   abbr;
1769 register const char *   word;
1770 {
1771         if (lowerit(*abbr) != lowerit(*word))
1772                 return FALSE;
1773         ++word;
1774         while (*++abbr != '\0')
1775                 do {
1776                         if (*word == '\0')
1777                                 return FALSE;
1778                 } while (lowerit(*word++) != lowerit(*abbr));
1779         return TRUE;
1780 }
1781
1782 static const struct lookup *
1783 byword(word, table)
1784 register const char * const             word;
1785 register const struct lookup * const    table;
1786 {
1787         register const struct lookup *  foundlp;
1788         register const struct lookup *  lp;
1789
1790         if (word == NULL || table == NULL)
1791                 return NULL;
1792         /*
1793         ** Look for exact match.
1794         */
1795         for (lp = table; lp->l_word != NULL; ++lp)
1796                 if (ciequal(word, lp->l_word))
1797                         return lp;
1798         /*
1799         ** Look for inexact match.
1800         */
1801         foundlp = NULL;
1802         for (lp = table; lp->l_word != NULL; ++lp)
1803                 if (itsabbr(word, lp->l_word))
1804                         if (foundlp == NULL)
1805                                 foundlp = lp;
1806                         else    return NULL;    /* multiple inexact matches */
1807         return foundlp;
1808 }
1809
1810 static char **
1811 getfields(cp)
1812 register char * cp;
1813 {
1814         register char *         dp;
1815         register char **        array;
1816         register int            nsubs;
1817
1818         if (cp == NULL)
1819                 return NULL;
1820         array = (char **) (void *)
1821                 emalloc((int) ((strlen(cp) + 1) * sizeof *array));
1822         nsubs = 0;
1823         for ( ; ; ) {
1824                 while (isascii(*cp) && isspace((unsigned char) *cp))
1825                         ++cp;
1826                 if (*cp == '\0' || *cp == '#')
1827                         break;
1828                 array[nsubs++] = dp = cp;
1829                 do {
1830                         if ((*dp = *cp++) != '"')
1831                                 ++dp;
1832                         else while ((*dp = *cp++) != '"')
1833                                 if (*dp != '\0')
1834                                         ++dp;
1835                                 else    error(_("Odd number of quotation marks"));
1836                 } while (*cp != '\0' && *cp != '#' &&
1837                         (!isascii(*cp) || !isspace((unsigned char) *cp)));
1838                 if (isascii(*cp) && isspace((unsigned char) *cp))
1839                         ++cp;
1840                 *dp = '\0';
1841         }
1842         array[nsubs] = NULL;
1843         return array;
1844 }
1845
1846 static long
1847 oadd(t1, t2)
1848 const long      t1;
1849 const long      t2;
1850 {
1851         register long   t;
1852
1853         t = t1 + t2;
1854         if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {
1855                 error(_("time overflow"));
1856                 (void) exit(EXIT_FAILURE);
1857         }
1858         return t;
1859 }
1860
1861 static time_t
1862 tadd(t1, t2)
1863 const time_t    t1;
1864 const long      t2;
1865 {
1866         register time_t t;
1867
1868         if (t1 == max_time && t2 > 0)
1869                 return max_time;
1870         if (t1 == min_time && t2 < 0)
1871                 return min_time;
1872         t = t1 + t2;
1873         if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {
1874                 error(_("time overflow"));
1875                 (void) exit(EXIT_FAILURE);
1876         }
1877         return t;
1878 }
1879
1880 /*
1881 ** Given a rule, and a year, compute the date - in seconds since January 1,
1882 ** 1970, 00:00 LOCAL time - in that year that the rule refers to.
1883 */
1884
1885 static time_t
1886 rpytime(rp, wantedy)
1887 register const struct rule * const      rp;
1888 register const int                      wantedy;
1889 {
1890         register int    y, m, i;
1891         register long   dayoff;                 /* with a nod to Margaret O. */
1892         register time_t t;
1893
1894         if (wantedy == INT_MIN)
1895                 return min_time;
1896         if (wantedy == INT_MAX)
1897                 return max_time;
1898         dayoff = 0;
1899         m = TM_JANUARY;
1900         y = EPOCH_YEAR;
1901         while (wantedy != y) {
1902                 if (wantedy > y) {
1903                         i = len_years[isleap(y)];
1904                         ++y;
1905                 } else {
1906                         --y;
1907                         i = -len_years[isleap(y)];
1908                 }
1909                 dayoff = oadd(dayoff, eitol(i));
1910         }
1911         while (m != rp->r_month) {
1912                 i = len_months[isleap(y)][m];
1913                 dayoff = oadd(dayoff, eitol(i));
1914                 ++m;
1915         }
1916         i = rp->r_dayofmonth;
1917         if (m == TM_FEBRUARY && i == 29 && !isleap(y)) {
1918                 if (rp->r_dycode == DC_DOWLEQ)
1919                         --i;
1920                 else {
1921                         error(_("use of 2/29 in non leap-year"));
1922                         (void) exit(EXIT_FAILURE);
1923                 }
1924         }
1925         --i;
1926         dayoff = oadd(dayoff, eitol(i));
1927         if (rp->r_dycode == DC_DOWGEQ || rp->r_dycode == DC_DOWLEQ) {
1928                 register long   wday;
1929
1930 #define LDAYSPERWEEK    ((long) DAYSPERWEEK)
1931                 wday = eitol(EPOCH_WDAY);
1932                 /*
1933                 ** Don't trust mod of negative numbers.
1934                 */
1935                 if (dayoff >= 0)
1936                         wday = (wday + dayoff) % LDAYSPERWEEK;
1937                 else {
1938                         wday -= ((-dayoff) % LDAYSPERWEEK);
1939                         if (wday < 0)
1940                                 wday += LDAYSPERWEEK;
1941                 }
1942                 while (wday != eitol(rp->r_wday))
1943                         if (rp->r_dycode == DC_DOWGEQ) {
1944                                 dayoff = oadd(dayoff, (long) 1);
1945                                 if (++wday >= LDAYSPERWEEK)
1946                                         wday = 0;
1947                                 ++i;
1948                         } else {
1949                                 dayoff = oadd(dayoff, (long) -1);
1950                                 if (--wday < 0)
1951                                         wday = LDAYSPERWEEK - 1;
1952                                 --i;
1953                         }
1954                 if (i < 0 || i >= len_months[isleap(y)][m]) {
1955                         error(_("no day in month matches rule"));
1956                         (void) exit(EXIT_FAILURE);
1957                 }
1958         }
1959         if (dayoff < 0 && !TYPE_SIGNED(time_t))
1960                 return min_time;
1961         t = (time_t) dayoff * SECSPERDAY;
1962         /*
1963         ** Cheap overflow check.
1964         */
1965         if (t / SECSPERDAY != dayoff)
1966                 return (dayoff > 0) ? max_time : min_time;
1967         return tadd(t, rp->r_tod);
1968 }
1969
1970 static void
1971 newabbr(string)
1972 const char * const      string;
1973 {
1974         register int    i;
1975
1976         i = strlen(string) + 1;
1977         if (charcnt + i > TZ_MAX_CHARS) {
1978                 error(_("too many, or too long, time zone abbreviations"));
1979                 (void) exit(EXIT_FAILURE);
1980         }
1981         (void) strcpy(&chars[charcnt], string);
1982         charcnt += eitol(i);
1983 }
1984
1985 static int
1986 mkdirs(argname)
1987 char * const    argname;
1988 {
1989         register char * name;
1990         register char * cp;
1991
1992         if (argname == NULL || *argname == '\0')
1993                 return 0;
1994         cp = name = ecpyalloc(argname);
1995         while ((cp = strchr(cp + 1, '/')) != 0) {
1996                 *cp = '\0';
1997 #ifndef unix
1998                 /*
1999                 ** DOS drive specifier?
2000                 */
2001                 if (isalpha((unsigned char) name[0]) &&
2002                         name[1] == ':' && name[2] == '\0') {
2003                                 *cp = '/';
2004                                 continue;
2005                 }
2006 #endif /* !defined unix */
2007                 if (!itsdir(name)) {
2008                         /*
2009                         ** It doesn't seem to exist, so we try to create it.
2010                         */
2011                         if (mkdir(name, 0755) != 0) {
2012                                 const char *e = strerror(errno);
2013                                 (void) fprintf(stderr,
2014                                     _("%s: Can't create directory %s: %s\n"),
2015                                     progname, name, e);
2016                                 ifree(name);
2017                                 return -1;
2018                         }
2019                 }
2020                 *cp = '/';
2021         }
2022         ifree(name);
2023         return 0;
2024 }
2025
2026 static long
2027 eitol(i)
2028 const int       i;
2029 {
2030         long    l;
2031
2032         l = i;
2033         if ((i < 0 && l >= 0) || (i == 0 && l != 0) || (i > 0 && l <= 0)) {
2034                 (void) fprintf(stderr,
2035                         _("%s: %d did not sign extend correctly\n"),
2036                         progname, i);
2037                 (void) exit(EXIT_FAILURE);
2038         }
2039         return l;
2040 }
2041
2042 /*
2043 ** UNIX was a registered trademark of UNIX System Laboratories in 1993.
2044 */