Add itoa-digits.
[kopensolaris-gnu/glibc.git] / time / zic.c
1 #ifndef lint
2 #ifndef NOID
3 static char     elsieid[] = "@(#)zic.c  7.87";
4 #endif /* !defined NOID */
5 #endif /* !defined lint */
6
7 #include "private.h"
8 #include "locale.h"
9 #include "tzfile.h"
10 #ifdef unix
11 #include "sys/stat.h"                   /* for umask manifest constants */
12 #endif /* defined unix */
13
14 /*
15 ** On some ancient hosts, predicates like `isspace(C)' are defined
16 ** only if isascii(C) || C == EOF.  Modern hosts obey the C Standard,
17 ** which says they are defined only if C == ((unsigned char) C) || C == EOF.
18 ** Neither the C Standard nor Posix require that `isascii' exist.
19 ** For portability, we check both ancient and modern requirements.
20 ** If isascii is not defined, the isascii check succeeds trivially.
21 */
22 #include "ctype.h"
23 #ifndef isascii
24 #define isascii(x) 1
25 #endif
26
27 struct rule {
28         const char *    r_filename;
29         int             r_linenum;
30         const char *    r_name;
31
32         int             r_loyear;       /* for example, 1986 */
33         int             r_hiyear;       /* for example, 1986 */
34         const char *    r_yrtype;
35
36         int             r_month;        /* 0..11 */
37
38         int             r_dycode;       /* see below */
39         int             r_dayofmonth;
40         int             r_wday;
41
42         long            r_tod;          /* time from midnight */
43         int             r_todisstd;     /* above is standard time if TRUE */
44                                         /* or wall clock time if FALSE */
45         int             r_todisgmt;     /* above is GMT if TRUE */
46                                         /* or local time if FALSE */
47         long            r_stdoff;       /* offset from standard time */
48         const char *    r_abbrvar;      /* variable part of abbreviation */
49
50         int             r_todo;         /* a rule to do (used in outzone) */
51         time_t          r_temp;         /* used in outzone */
52 };
53
54 /*
55 **      r_dycode                r_dayofmonth    r_wday
56 */
57
58 #define DC_DOM          0       /* 1..31 */     /* unused */
59 #define DC_DOWGEQ       1       /* 1..31 */     /* 0..6 (Sun..Sat) */
60 #define DC_DOWLEQ       2       /* 1..31 */     /* 0..6 (Sun..Sat) */
61
62 struct zone {
63         const char *    z_filename;
64         int             z_linenum;
65
66         const char *    z_name;
67         long            z_gmtoff;
68         const char *    z_rule;
69         const char *    z_format;
70
71         long            z_stdoff;
72
73         struct rule *   z_rules;
74         int             z_nrules;
75
76         struct rule     z_untilrule;
77         time_t          z_untiltime;
78 };
79
80 extern int      getopt P((int argc, char * const argv[],
81                         const char * options));
82 extern int      link P((const char * fromname, const char * toname));
83 extern char *   optarg;
84 extern int      optind;
85
86 static void     addtt P((time_t starttime, int type));
87 static int      addtype P((long gmtoff, const char * abbr, int isdst,
88                                 int ttisstd, int ttisgmt));
89 static void     leapadd P((time_t t, int positive, int rolling, int count));
90 static void     adjleap P((void));
91 static void     associate P((void));
92 static int      ciequal P((const char * ap, const char * bp));
93 static void     convert P((long val, char * buf));
94 static void     dolink P((const char * fromfile, const char * tofile));
95 static void     doabbr P((char * abbr, const char * format,
96                         const char * letters, int isdst));
97 static void     eat P((const char * name, int num));
98 static void     eats P((const char * name, int num,
99                         const char * rname, int rnum));
100 static long     eitol P((int i));
101 static void     error P((const char * message));
102 static char **  getfields P((char * buf));
103 static long     gethms P((const char * string, const char * errstrng,
104                         int signable));
105 static void     infile P((const char * filename));
106 static void     inleap P((char ** fields, int nfields));
107 static void     inlink P((char ** fields, int nfields));
108 static void     inrule P((char ** fields, int nfields));
109 static int      inzcont P((char ** fields, int nfields));
110 static int      inzone P((char ** fields, int nfields));
111 static int      inzsub P((char ** fields, int nfields, int iscont));
112 static int      itsabbr P((const char * abbr, const char * word));
113 static int      itsdir P((const char * name));
114 static int      lowerit P((int c));
115 static char *   memcheck P((char * tocheck));
116 static int      mkdirs P((char * filename));
117 static void     newabbr P((const char * abbr));
118 static long     oadd P((long t1, long t2));
119 static void     outzone P((const struct zone * zp, int ntzones));
120 static void     puttzcode P((long code, FILE * fp));
121 static int      rcomp P((const void * leftp, const void * rightp));
122 static time_t   rpytime P((const struct rule * rp, int wantedy));
123 static void     rulesub P((struct rule * rp,
124                         const char * loyearp, const char * hiyearp,
125                         const char * typep, const char * monthp,
126                         const char * dayp, const char * timep));
127 static void     setboundaries P((void));
128 static time_t   tadd P((time_t t1, long t2));
129 static void     usage P((void));
130 static void     writezone P((const char * name));
131 static int      yearistype P((int year, const char * type));
132
133 #if !(HAVE_STRERROR - 0)
134 static char *   strerror P((int));
135 #endif /* !(HAVE_STRERROR - 0) */
136
137 static int              charcnt;
138 static int              errors;
139 static const char *     filename;
140 static int              leapcnt;
141 static int              linenum;
142 static time_t           max_time;
143 static int              max_year;
144 static int              max_year_representable;
145 static time_t           min_time;
146 static int              min_year;
147 static int              min_year_representable;
148 static int              noise;
149 static const char *     rfilename;
150 static int              rlinenum;
151 static const char *     progname;
152 static int              timecnt;
153 static int              typecnt;
154
155 /*
156 ** Line codes.
157 */
158
159 #define LC_RULE         0
160 #define LC_ZONE         1
161 #define LC_LINK         2
162 #define LC_LEAP         3
163
164 /*
165 ** Which fields are which on a Zone line.
166 */
167
168 #define ZF_NAME         1
169 #define ZF_GMTOFF       2
170 #define ZF_RULE         3
171 #define ZF_FORMAT       4
172 #define ZF_TILYEAR      5
173 #define ZF_TILMONTH     6
174 #define ZF_TILDAY       7
175 #define ZF_TILTIME      8
176 #define ZONE_MINFIELDS  5
177 #define ZONE_MAXFIELDS  9
178
179 /*
180 ** Which fields are which on a Zone continuation line.
181 */
182
183 #define ZFC_GMTOFF      0
184 #define ZFC_RULE        1
185 #define ZFC_FORMAT      2
186 #define ZFC_TILYEAR     3
187 #define ZFC_TILMONTH    4
188 #define ZFC_TILDAY      5
189 #define ZFC_TILTIME     6
190 #define ZONEC_MINFIELDS 3
191 #define ZONEC_MAXFIELDS 7
192
193 /*
194 ** Which files are which on a Rule line.
195 */
196
197 #define RF_NAME         1
198 #define RF_LOYEAR       2
199 #define RF_HIYEAR       3
200 #define RF_COMMAND      4
201 #define RF_MONTH        5
202 #define RF_DAY          6
203 #define RF_TOD          7
204 #define RF_STDOFF       8
205 #define RF_ABBRVAR      9
206 #define RULE_FIELDS     10
207
208 /*
209 ** Which fields are which on a Link line.
210 */
211
212 #define LF_FROM         1
213 #define LF_TO           2
214 #define LINK_FIELDS     3
215
216 /*
217 ** Which fields are which on a Leap line.
218 */
219
220 #define LP_YEAR         1
221 #define LP_MONTH        2
222 #define LP_DAY          3
223 #define LP_TIME         4
224 #define LP_CORR         5
225 #define LP_ROLL         6
226 #define LEAP_FIELDS     7
227
228 /*
229 ** Year synonyms.
230 */
231
232 #define YR_MINIMUM      0
233 #define YR_MAXIMUM      1
234 #define YR_ONLY         2
235
236 static struct rule *    rules;
237 static int              nrules; /* number of rules */
238
239 static struct zone *    zones;
240 static int              nzones; /* number of zones */
241
242 struct link {
243         const char *    l_filename;
244         int             l_linenum;
245         const char *    l_from;
246         const char *    l_to;
247 };
248
249 static struct link *    links;
250 static int              nlinks;
251
252 struct lookup {
253         const char *    l_word;
254         const int       l_value;
255 };
256
257 static struct lookup const *    byword P((const char * string,
258                                         const struct lookup * lp));
259
260 static struct lookup const      line_codes[] = {
261         { "Rule",       LC_RULE },
262         { "Zone",       LC_ZONE },
263         { "Link",       LC_LINK },
264         { "Leap",       LC_LEAP },
265         { NULL,         0}
266 };
267
268 static struct lookup const      mon_names[] = {
269         { "January",    TM_JANUARY },
270         { "February",   TM_FEBRUARY },
271         { "March",      TM_MARCH },
272         { "April",      TM_APRIL },
273         { "May",        TM_MAY },
274         { "June",       TM_JUNE },
275         { "July",       TM_JULY },
276         { "August",     TM_AUGUST },
277         { "September",  TM_SEPTEMBER },
278         { "October",    TM_OCTOBER },
279         { "November",   TM_NOVEMBER },
280         { "December",   TM_DECEMBER },
281         { NULL,         0 }
282 };
283
284 static struct lookup const      wday_names[] = {
285         { "Sunday",     TM_SUNDAY },
286         { "Monday",     TM_MONDAY },
287         { "Tuesday",    TM_TUESDAY },
288         { "Wednesday",  TM_WEDNESDAY },
289         { "Thursday",   TM_THURSDAY },
290         { "Friday",     TM_FRIDAY },
291         { "Saturday",   TM_SATURDAY },
292         { NULL,         0 }
293 };
294
295 static struct lookup const      lasts[] = {
296         { "last-Sunday",        TM_SUNDAY },
297         { "last-Monday",        TM_MONDAY },
298         { "last-Tuesday",       TM_TUESDAY },
299         { "last-Wednesday",     TM_WEDNESDAY },
300         { "last-Thursday",      TM_THURSDAY },
301         { "last-Friday",        TM_FRIDAY },
302         { "last-Saturday",      TM_SATURDAY },
303         { NULL,                 0 }
304 };
305
306 static struct lookup const      begin_years[] = {
307         { "minimum",    YR_MINIMUM },
308         { "maximum",    YR_MAXIMUM },
309         { NULL,         0 }
310 };
311
312 static struct lookup const      end_years[] = {
313         { "minimum",    YR_MINIMUM },
314         { "maximum",    YR_MAXIMUM },
315         { "only",       YR_ONLY },
316         { NULL,         0 }
317 };
318
319 static struct lookup const      leap_types[] = {
320         { "Rolling",    TRUE },
321         { "Stationary", FALSE },
322         { NULL,         0 }
323 };
324
325 static const int        len_months[2][MONSPERYEAR] = {
326         { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
327         { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
328 };
329
330 static const int        len_years[2] = {
331         DAYSPERNYEAR, DAYSPERLYEAR
332 };
333
334 static struct attype {
335         time_t          at;
336         unsigned char   type;
337 }                       attypes[TZ_MAX_TIMES];
338 static long             gmtoffs[TZ_MAX_TYPES];
339 static char             isdsts[TZ_MAX_TYPES];
340 static unsigned char    abbrinds[TZ_MAX_TYPES];
341 static char             ttisstds[TZ_MAX_TYPES];
342 static char             ttisgmts[TZ_MAX_TYPES];
343 static char             chars[TZ_MAX_CHARS];
344 static time_t           trans[TZ_MAX_LEAPS];
345 static long             corr[TZ_MAX_LEAPS];
346 static char             roll[TZ_MAX_LEAPS];
347
348 /*
349 ** Memory allocation.
350 */
351
352 static char *
353 memcheck(ptr)
354 char * const    ptr;
355 {
356         if (ptr == NULL) {
357                 const char *e = strerror(errno);
358
359                 (void) fprintf(stderr, _("%s: Memory exhausted: %s\n"),
360                         progname, e);
361                 (void) exit(EXIT_FAILURE);
362         }
363         return ptr;
364 }
365
366 #define emalloc(size)           memcheck(imalloc(size))
367 #define erealloc(ptr, size)     memcheck(irealloc((ptr), (size)))
368 #define ecpyalloc(ptr)          memcheck(icpyalloc(ptr))
369 #define ecatalloc(oldp, newp)   memcheck(icatalloc((oldp), (newp)))
370
371 /*
372 ** Error handling.
373 */
374
375 #if !(HAVE_STRERROR - 0)
376 static char *
377 strerror(errnum)
378 int     errnum;
379 {
380         extern char *   sys_errlist[];
381         extern int      sys_nerr;
382
383         return (errnum > 0 && errnum <= sys_nerr) ?
384                 sys_errlist[errnum] : "Unknown system error";
385 }
386 #endif /* !(HAVE_STRERROR - 0) */
387
388 static void
389 eats(name, num, rname, rnum)
390 const char * const      name;
391 const int               num;
392 const char * const      rname;
393 const int               rnum;
394 {
395         filename = name;
396         linenum = num;
397         rfilename = rname;
398         rlinenum = rnum;
399 }
400
401 static void
402 eat(name, num)
403 const char * const      name;
404 const int               num;
405 {
406         eats(name, num, (char *) NULL, -1);
407 }
408
409 static void
410 error(string)
411 const char * const      string;
412 {
413         /*
414         ** Match the format of "cc" to allow sh users to
415         **      zic ... 2>&1 | error -t "*" -v
416         ** on BSD systems.
417         */
418         (void) fprintf(stderr, _("\"%s\", line %d: %s"),
419                 filename, linenum, string);
420         if (rfilename != NULL)
421                 (void) fprintf(stderr, _(" (rule from \"%s\", line %d)"),
422                         rfilename, rlinenum);
423         (void) fprintf(stderr, "\n");
424         ++errors;
425 }
426
427 static void
428 warning(string)
429 const char * const      string;
430 {
431         char *  cp;
432
433         cp = ecpyalloc("warning: ");
434         cp = ecatalloc(cp, string);
435         error(cp);
436         ifree(cp);
437         --errors;
438 }
439
440 static void
441 usage P((void))
442 {
443         (void) fprintf(stderr, _("%s: usage is %s [ -s ] [ -v ] [ -l localtime ] [ -p posixrules ] [ -d directory ]\n\t[ -L leapseconds ] [ -y yearistype ] [ filename ... ]\n"),
444                 progname, progname);
445         (void) exit(EXIT_FAILURE);
446 }
447
448 static const char *     psxrules;
449 static const char *     lcltime;
450 static const char *     directory;
451 static const char *     leapsec;
452 static const char *     yitcommand;
453 static int              sflag = FALSE;
454
455 int
456 main(argc, argv)
457 int     argc;
458 char *  argv[];
459 {
460         register int    i;
461         register int    j;
462         register int    c;
463
464 #ifdef unix
465         (void) umask(umask(S_IWGRP | S_IWOTH) | (S_IWGRP | S_IWOTH));
466 #endif /* defined unix */
467 #if HAVE_GETTEXT - 0
468         (void) setlocale(LC_MESSAGES, "");
469 #ifdef TZ_DOMAINDIR
470         (void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR);
471 #endif /* defined TEXTDOMAINDIR */
472         (void) textdomain(TZ_DOMAIN);
473 #endif /* HAVE_GETTEXT - 0 */
474         progname = argv[0];
475         while ((c = getopt(argc, argv, "d:l:p:L:vsy:")) != EOF && c != -1)
476                 switch (c) {
477                         default:
478                                 usage();
479                         case 'd':
480                                 if (directory == NULL)
481                                         directory = optarg;
482                                 else {
483                                         (void) fprintf(stderr,
484 _("%s: More than one -d option specified\n"),
485                                                 progname);
486                                         (void) exit(EXIT_FAILURE);
487                                 }
488                                 break;
489                         case 'l':
490                                 if (lcltime == NULL)
491                                         lcltime = optarg;
492                                 else {
493                                         (void) fprintf(stderr,
494 _("%s: More than one -l option specified\n"),
495                                                 progname);
496                                         (void) exit(EXIT_FAILURE);
497                                 }
498                                 break;
499                         case 'p':
500                                 if (psxrules == NULL)
501                                         psxrules = optarg;
502                                 else {
503                                         (void) fprintf(stderr,
504 _("%s: More than one -p option specified\n"),
505                                                 progname);
506                                         (void) exit(EXIT_FAILURE);
507                                 }
508                                 break;
509                         case 'y':
510                                 if (yitcommand == NULL)
511                                         yitcommand = optarg;
512                                 else {
513                                         (void) fprintf(stderr,
514 _("%s: More than one -y option specified\n"),
515                                                 progname);
516                                         (void) exit(EXIT_FAILURE);
517                                 }
518                                 break;
519                         case 'L':
520                                 if (leapsec == NULL)
521                                         leapsec = optarg;
522                                 else {
523                                         (void) fprintf(stderr,
524 _("%s: More than one -L option specified\n"),
525                                                 progname);
526                                         (void) exit(EXIT_FAILURE);
527                                 }
528                                 break;
529                         case 'v':
530                                 noise = TRUE;
531                                 break;
532                         case 's':
533                                 sflag = TRUE;
534                                 break;
535                 }
536         if (optind == argc - 1 && strcmp(argv[optind], "=") == 0)
537                 usage();        /* usage message by request */
538         if (directory == NULL)
539                 directory = TZDIR;
540         if (yitcommand == NULL)
541                 yitcommand = "yearistype";
542
543         setboundaries();
544
545         if (optind < argc && leapsec != NULL) {
546                 infile(leapsec);
547                 adjleap();
548         }
549
550         for (i = optind; i < argc; ++i)
551                 infile(argv[i]);
552         if (errors)
553                 (void) exit(EXIT_FAILURE);
554         associate();
555         for (i = 0; i < nzones; i = j) {
556                 /*
557                 ** Find the next non-continuation zone entry.
558                 */
559                 for (j = i + 1; j < nzones && zones[j].z_name == NULL; ++j)
560                         continue;
561                 outzone(&zones[i], j - i);
562         }
563         /*
564         ** Make links.
565         */
566         for (i = 0; i < nlinks; ++i)
567                 dolink(links[i].l_from, links[i].l_to);
568         if (lcltime != NULL)
569                 dolink(lcltime, TZDEFAULT);
570         if (psxrules != NULL)
571                 dolink(psxrules, TZDEFRULES);
572         return (errors == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
573 }
574
575 static void
576 dolink(fromfile, tofile)
577 const char * const      fromfile;
578 const char * const      tofile;
579 {
580         register char * fromname;
581         register char * toname;
582
583         if (fromfile[0] == '/')
584                 fromname = ecpyalloc(fromfile);
585         else {
586                 fromname = ecpyalloc(directory);
587                 fromname = ecatalloc(fromname, "/");
588                 fromname = ecatalloc(fromname, fromfile);
589         }
590         if (tofile[0] == '/')
591                 toname = ecpyalloc(tofile);
592         else {
593                 toname = ecpyalloc(directory);
594                 toname = ecatalloc(toname, "/");
595                 toname = ecatalloc(toname, tofile);
596         }
597         /*
598         ** We get to be careful here since
599         ** there's a fair chance of root running us.
600         */
601         if (!itsdir(toname))
602                 (void) remove(toname);
603         if (link(fromname, toname) != 0) {
604                 if (mkdirs(toname) != 0)
605                         (void) exit(EXIT_FAILURE);
606                 if (link(fromname, toname) != 0) {
607                         const char *e = strerror(errno);
608
609                         (void) fprintf(stderr,
610                                 _("%s: Can't link from %s to %s: %s\n"),
611                                 progname, fromname, toname, e);
612                         (void) exit(EXIT_FAILURE);
613                 }
614         }
615         ifree(fromname);
616         ifree(toname);
617 }
618
619 #ifndef INT_MAX
620 #define INT_MAX ((int) (((unsigned)~0)>>1))
621 #endif /* !defined INT_MAX */
622
623 #ifndef INT_MIN
624 #define INT_MIN ((int) ~(((unsigned)~0)>>1))
625 #endif /* !defined INT_MIN */
626
627 /*
628 ** The tz file format currently allows at most 32-bit quantities.
629 ** This restriction should be removed before signed 32-bit values
630 ** wrap around in 2038, but unfortunately this will require a
631 ** change to the tz file format.
632 */
633
634 #define MAX_BITS_IN_FILE        32
635 #define TIME_T_BITS_IN_FILE     ((TYPE_BIT(time_t) < MAX_BITS_IN_FILE) ? TYPE_BIT(time_t) : MAX_BITS_IN_FILE)
636
637 static void
638 setboundaries P((void))
639 {
640         if (TYPE_SIGNED(time_t)) {
641                 min_time = ~ (time_t) 0;
642                 min_time <<= TIME_T_BITS_IN_FILE - 1;
643                 max_time = ~ (time_t) 0 - min_time;
644                 if (sflag)
645                         min_time = 0;
646         } else {
647                 min_time = 0;
648                 max_time = 2 - sflag;
649                 max_time <<= TIME_T_BITS_IN_FILE - 1;
650                 --max_time;
651         }
652         min_year = TM_YEAR_BASE + gmtime(&min_time)->tm_year;
653         max_year = TM_YEAR_BASE + gmtime(&max_time)->tm_year;
654         min_year_representable = min_year;
655         max_year_representable = max_year;
656 }
657
658 static int
659 itsdir(name)
660 const char * const      name;
661 {
662         register char * myname;
663         register int    accres;
664
665         myname = ecpyalloc(name);
666         myname = ecatalloc(myname, "/.");
667         accres = access(myname, F_OK);
668         ifree(myname);
669         return accres == 0;
670 }
671
672 /*
673 ** Associate sets of rules with zones.
674 */
675
676 /*
677 ** Sort by rule name.
678 */
679
680 static int
681 rcomp(cp1, cp2)
682 const void *    cp1;
683 const void *    cp2;
684 {
685         return strcmp(((const struct rule *) cp1)->r_name,
686                 ((const struct rule *) cp2)->r_name);
687 }
688
689 static void
690 associate P((void))
691 {
692         register struct zone *  zp;
693         register struct rule *  rp;
694         register int            base, out;
695         register int            i, j;
696
697         if (nrules != 0) {
698                 (void) qsort((void *) rules, (size_t) nrules,
699                         (size_t) sizeof *rules, rcomp);
700                 for (i = 0; i < nrules - 1; ++i) {
701                         if (strcmp(rules[i].r_name,
702                                 rules[i + 1].r_name) != 0)
703                                         continue;
704                         if (strcmp(rules[i].r_filename,
705                                 rules[i + 1].r_filename) == 0)
706                                         continue;
707                         eat(rules[i].r_filename, rules[i].r_linenum);
708                         warning(_("same rule name in multiple files"));
709                         eat(rules[i + 1].r_filename, rules[i + 1].r_linenum);
710                         warning(_("same rule name in multiple files"));
711                         for (j = i + 2; j < nrules; ++j) {
712                                 if (strcmp(rules[i].r_name,
713                                         rules[j].r_name) != 0)
714                                                 break;
715                                 if (strcmp(rules[i].r_filename,
716                                         rules[j].r_filename) == 0)
717                                                 continue;
718                                 if (strcmp(rules[i + 1].r_filename,
719                                         rules[j].r_filename) == 0)
720                                                 continue;
721                                 break;
722                         }
723                         i = j - 1;
724                 }
725         }
726         for (i = 0; i < nzones; ++i) {
727                 zp = &zones[i];
728                 zp->z_rules = NULL;
729                 zp->z_nrules = 0;
730         }
731         for (base = 0; base < nrules; base = out) {
732                 rp = &rules[base];
733                 for (out = base + 1; out < nrules; ++out)
734                         if (strcmp(rp->r_name, rules[out].r_name) != 0)
735                                 break;
736                 for (i = 0; i < nzones; ++i) {
737                         zp = &zones[i];
738                         if (strcmp(zp->z_rule, rp->r_name) != 0)
739                                 continue;
740                         zp->z_rules = rp;
741                         zp->z_nrules = out - base;
742                 }
743         }
744         for (i = 0; i < nzones; ++i) {
745                 zp = &zones[i];
746                 if (zp->z_nrules == 0) {
747                         /*
748                         ** Maybe we have a local standard time offset.
749                         */
750                         eat(zp->z_filename, zp->z_linenum);
751                         zp->z_stdoff = gethms(zp->z_rule, _("unruly zone"),
752                                               TRUE);
753                         /*
754                         ** Note, though, that if there's no rule,
755                         ** a '%s' in the format is a bad thing.
756                         */
757                         if (strchr(zp->z_format, '%') != 0)
758                                 error(_("%s in ruleless zone"));
759                 }
760         }
761         if (errors)
762                 (void) exit(EXIT_FAILURE);
763 }
764
765 static void
766 infile(name)
767 const char *    name;
768 {
769         register FILE *                 fp;
770         register char **                fields;
771         register char *                 cp;
772         register const struct lookup *  lp;
773         register int                    nfields;
774         register int                    wantcont;
775         register int                    num;
776         char                            buf[BUFSIZ];
777
778         if (strcmp(name, "-") == 0) {
779                 name = _("standard input");
780                 fp = stdin;
781         } else if ((fp = fopen(name, "r")) == NULL) {
782                 const char *e = strerror(errno);
783
784                 (void) fprintf(stderr, _("%s: Can't open %s: %s\n"),
785                         progname, name, e);
786                 (void) exit(EXIT_FAILURE);
787         }
788         wantcont = FALSE;
789         for (num = 1; ; ++num) {
790                 eat(name, num);
791                 if (fgets(buf, (int) sizeof buf, fp) != buf)
792                         break;
793                 cp = strchr(buf, '\n');
794                 if (cp == NULL) {
795                         error(_("line too long"));
796                         (void) exit(EXIT_FAILURE);
797                 }
798                 *cp = '\0';
799                 fields = getfields(buf);
800                 nfields = 0;
801                 while (fields[nfields] != NULL) {
802                         static char     nada;
803
804                         if (strcmp(fields[nfields], "-") == 0)
805                                 fields[nfields] = &nada;
806                         ++nfields;
807                 }
808                 if (nfields == 0) {
809                         /* nothing to do */
810                 } else if (wantcont) {
811                         wantcont = inzcont(fields, nfields);
812                 } else {
813                         lp = byword(fields[0], line_codes);
814                         if (lp == NULL)
815                                 error(_("input line of unknown type"));
816                         else switch ((int) (lp->l_value)) {
817                                 case LC_RULE:
818                                         inrule(fields, nfields);
819                                         wantcont = FALSE;
820                                         break;
821                                 case LC_ZONE:
822                                         wantcont = inzone(fields, nfields);
823                                         break;
824                                 case LC_LINK:
825                                         inlink(fields, nfields);
826                                         wantcont = FALSE;
827                                         break;
828                                 case LC_LEAP:
829                                         if (name != leapsec)
830                                                 (void) fprintf(stderr,
831 _("%s: Leap line in non leap seconds file %s\n"),
832                                                         progname, name);
833                                         else    inleap(fields, nfields);
834                                         wantcont = FALSE;
835                                         break;
836                                 default:        /* "cannot happen" */
837                                         (void) fprintf(stderr,
838 _("%s: panic: Invalid l_value %d\n"),
839                                                 progname, lp->l_value);
840                                         (void) exit(EXIT_FAILURE);
841                         }
842                 }
843                 ifree((char *) fields);
844         }
845         if (ferror(fp)) {
846                 (void) fprintf(stderr, _("%s: Error reading %s\n"),
847                         progname, filename);
848                 (void) exit(EXIT_FAILURE);
849         }
850         if (fp != stdin && fclose(fp)) {
851                 const char *e = strerror(errno);
852
853                 (void) fprintf(stderr, _("%s: Error closing %s: %s\n"),
854                         progname, filename, e);
855                 (void) exit(EXIT_FAILURE);
856         }
857         if (wantcont)
858                 error(_("expected continuation line not found"));
859 }
860
861 /*
862 ** Convert a string of one of the forms
863 **      h       -h      hh:mm   -hh:mm  hh:mm:ss        -hh:mm:ss
864 ** into a number of seconds.
865 ** A null string maps to zero.
866 ** Call error with errstring and return zero on errors.
867 */
868
869 static long
870 gethms(string, errstring, signable)
871 const char *            string;
872 const char * const      errstring;
873 const int               signable;
874 {
875         int     hh, mm, ss, sign;
876
877         if (string == NULL || *string == '\0')
878                 return 0;
879         if (!signable)
880                 sign = 1;
881         else if (*string == '-') {
882                 sign = -1;
883                 ++string;
884         } else  sign = 1;
885         if (sscanf(string, scheck(string, "%d"), &hh) == 1)
886                 mm = ss = 0;
887         else if (sscanf(string, scheck(string, "%d:%d"), &hh, &mm) == 2)
888                 ss = 0;
889         else if (sscanf(string, scheck(string, "%d:%d:%d"),
890                 &hh, &mm, &ss) != 3) {
891                         error(errstring);
892                         return 0;
893         }
894         if (hh < 0 || hh >= HOURSPERDAY ||
895                 mm < 0 || mm >= MINSPERHOUR ||
896                 ss < 0 || ss > SECSPERMIN) {
897                         error(errstring);
898                         return 0;
899         }
900         return eitol(sign) *
901                 (eitol(hh * MINSPERHOUR + mm) *
902                 eitol(SECSPERMIN) + eitol(ss));
903 }
904
905 static void
906 inrule(fields, nfields)
907 register char ** const  fields;
908 const int               nfields;
909 {
910         static struct rule      r;
911
912         if (nfields != RULE_FIELDS) {
913                 error(_("wrong number of fields on Rule line"));
914                 return;
915         }
916         if (*fields[RF_NAME] == '\0') {
917                 error(_("nameless rule"));
918                 return;
919         }
920         r.r_filename = filename;
921         r.r_linenum = linenum;
922         r.r_stdoff = gethms(fields[RF_STDOFF], _("invalid saved time"), TRUE);
923         rulesub(&r, fields[RF_LOYEAR], fields[RF_HIYEAR], fields[RF_COMMAND],
924                 fields[RF_MONTH], fields[RF_DAY], fields[RF_TOD]);
925         r.r_name = ecpyalloc(fields[RF_NAME]);
926         r.r_abbrvar = ecpyalloc(fields[RF_ABBRVAR]);
927         rules = (struct rule *) (void *) erealloc((char *) rules,
928                 (int) ((nrules + 1) * sizeof *rules));
929         rules[nrules++] = r;
930 }
931
932 static int
933 inzone(fields, nfields)
934 register char ** const  fields;
935 const int               nfields;
936 {
937         register int    i;
938         static char *   buf;
939
940         if (nfields < ZONE_MINFIELDS || nfields > ZONE_MAXFIELDS) {
941                 error(_("wrong number of fields on Zone line"));
942                 return FALSE;
943         }
944         if (strcmp(fields[ZF_NAME], TZDEFAULT) == 0 && lcltime != NULL) {
945                 buf = erealloc(buf, (int) (132 + strlen(TZDEFAULT)));
946                 (void) sprintf(buf,
947 _("\"Zone %s\" line and -l option are mutually exclusive"),
948                         TZDEFAULT);
949                 error(buf);
950                 return FALSE;
951         }
952         if (strcmp(fields[ZF_NAME], TZDEFRULES) == 0 && psxrules != NULL) {
953                 buf = erealloc(buf, (int) (132 + strlen(TZDEFRULES)));
954                 (void) sprintf(buf,
955 _("\"Zone %s\" line and -p option are mutually exclusive"),
956                         TZDEFRULES);
957                 error(buf);
958                 return FALSE;
959         }
960         for (i = 0; i < nzones; ++i)
961                 if (zones[i].z_name != NULL &&
962                         strcmp(zones[i].z_name, fields[ZF_NAME]) == 0) {
963                                 buf = erealloc(buf, (int) (132 +
964                                         strlen(fields[ZF_NAME]) +
965                                         strlen(zones[i].z_filename)));
966                                 (void) sprintf(buf,
967 _("duplicate zone name %s (file \"%s\", line %d)"),
968                                         fields[ZF_NAME],
969                                         zones[i].z_filename,
970                                         zones[i].z_linenum);
971                                 error(buf);
972                                 return FALSE;
973                 }
974         return inzsub(fields, nfields, FALSE);
975 }
976
977 static int
978 inzcont(fields, nfields)
979 register char ** const  fields;
980 const int               nfields;
981 {
982         if (nfields < ZONEC_MINFIELDS || nfields > ZONEC_MAXFIELDS) {
983                 error(_("wrong number of fields on Zone continuation line"));
984                 return FALSE;
985         }
986         return inzsub(fields, nfields, TRUE);
987 }
988
989 static int
990 inzsub(fields, nfields, iscont)
991 register char ** const  fields;
992 const int               nfields;
993 const int               iscont;
994 {
995         register char *         cp;
996         static struct zone      z;
997         register int            i_gmtoff, i_rule, i_format;
998         register int            i_untilyear, i_untilmonth;
999         register int            i_untilday, i_untiltime;
1000         register int            hasuntil;
1001
1002         if (iscont) {
1003                 i_gmtoff = ZFC_GMTOFF;
1004                 i_rule = ZFC_RULE;
1005                 i_format = ZFC_FORMAT;
1006                 i_untilyear = ZFC_TILYEAR;
1007                 i_untilmonth = ZFC_TILMONTH;
1008                 i_untilday = ZFC_TILDAY;
1009                 i_untiltime = ZFC_TILTIME;
1010                 z.z_name = NULL;
1011         } else {
1012                 i_gmtoff = ZF_GMTOFF;
1013                 i_rule = ZF_RULE;
1014                 i_format = ZF_FORMAT;
1015                 i_untilyear = ZF_TILYEAR;
1016                 i_untilmonth = ZF_TILMONTH;
1017                 i_untilday = ZF_TILDAY;
1018                 i_untiltime = ZF_TILTIME;
1019                 z.z_name = ecpyalloc(fields[ZF_NAME]);
1020         }
1021         z.z_filename = filename;
1022         z.z_linenum = linenum;
1023         z.z_gmtoff = gethms(fields[i_gmtoff], _("invalid GMT offset"), TRUE);
1024         if ((cp = strchr(fields[i_format], '%')) != 0) {
1025                 if (*++cp != 's' || strchr(cp, '%') != 0) {
1026                         error(_("invalid abbreviation format"));
1027                         return FALSE;
1028                 }
1029         }
1030         z.z_rule = ecpyalloc(fields[i_rule]);
1031         z.z_format = ecpyalloc(fields[i_format]);
1032         hasuntil = nfields > i_untilyear;
1033         if (hasuntil) {
1034                 z.z_untilrule.r_filename = filename;
1035                 z.z_untilrule.r_linenum = linenum;
1036                 rulesub(&z.z_untilrule,
1037                         fields[i_untilyear],
1038                         "only",
1039                         "",
1040                         (nfields > i_untilmonth) ?
1041                         fields[i_untilmonth] : "Jan",
1042                         (nfields > i_untilday) ? fields[i_untilday] : "1",
1043                         (nfields > i_untiltime) ? fields[i_untiltime] : "0");
1044                 z.z_untiltime = rpytime(&z.z_untilrule,
1045                         z.z_untilrule.r_loyear);
1046                 if (iscont && nzones > 0 &&
1047                         z.z_untiltime > min_time &&
1048                         z.z_untiltime < max_time &&
1049                         zones[nzones - 1].z_untiltime > min_time &&
1050                         zones[nzones - 1].z_untiltime < max_time &&
1051                         zones[nzones - 1].z_untiltime >= z.z_untiltime) {
1052                                 error(_("Zone continuation line end time is not after end time of previous line"));
1053                                 return FALSE;
1054                 }
1055         }
1056         zones = (struct zone *) (void *) erealloc((char *) zones,
1057                 (int) ((nzones + 1) * sizeof *zones));
1058         zones[nzones++] = z;
1059         /*
1060         ** If there was an UNTIL field on this line,
1061         ** there's more information about the zone on the next line.
1062         */
1063         return hasuntil;
1064 }
1065
1066 static void
1067 inleap(fields, nfields)
1068 register char ** const  fields;
1069 const int               nfields;
1070 {
1071         register const char *           cp;
1072         register const struct lookup *  lp;
1073         register int                    i, j;
1074         int                             year, month, day;
1075         long                            dayoff, tod;
1076         time_t                          t;
1077
1078         if (nfields != LEAP_FIELDS) {
1079                 error(_("wrong number of fields on Leap line"));
1080                 return;
1081         }
1082         dayoff = 0;
1083         cp = fields[LP_YEAR];
1084         if (sscanf(cp, scheck(cp, "%d"), &year) != 1) {
1085                         /*
1086                          * Leapin' Lizards!
1087                          */
1088                         error(_("invalid leaping year"));
1089                         return;
1090         }
1091         j = EPOCH_YEAR;
1092         while (j != year) {
1093                 if (year > j) {
1094                         i = len_years[isleap(j)];
1095                         ++j;
1096                 } else {
1097                         --j;
1098                         i = -len_years[isleap(j)];
1099                 }
1100                 dayoff = oadd(dayoff, eitol(i));
1101         }
1102         if ((lp = byword(fields[LP_MONTH], mon_names)) == NULL) {
1103                 error(_("invalid month name"));
1104                 return;
1105         }
1106         month = lp->l_value;
1107         j = TM_JANUARY;
1108         while (j != month) {
1109                 i = len_months[isleap(year)][j];
1110                 dayoff = oadd(dayoff, eitol(i));
1111                 ++j;
1112         }
1113         cp = fields[LP_DAY];
1114         if (sscanf(cp, scheck(cp, "%d"), &day) != 1 ||
1115                 day <= 0 || day > len_months[isleap(year)][month]) {
1116                         error(_("invalid day of month"));
1117                         return;
1118         }
1119         dayoff = oadd(dayoff, eitol(day - 1));
1120         if (dayoff < 0 && !TYPE_SIGNED(time_t)) {
1121                 error(_("time before zero"));
1122                 return;
1123         }
1124         t = (time_t) dayoff * SECSPERDAY;
1125         /*
1126         ** Cheap overflow check.
1127         */
1128         if (t / SECSPERDAY != dayoff) {
1129                 error(_("time overflow"));
1130                 return;
1131         }
1132         tod = gethms(fields[LP_TIME], _("invalid time of day"), FALSE);
1133         cp = fields[LP_CORR];
1134         {
1135                 register int    positive;
1136                 int             count;
1137
1138                 if (strcmp(cp, "") == 0) { /* infile() turns "-" into "" */
1139                         positive = FALSE;
1140                         count = 1;
1141                 } else if (strcmp(cp, "--") == 0) {
1142                         positive = FALSE;
1143                         count = 2;
1144                 } else if (strcmp(cp, "+") == 0) {
1145                         positive = TRUE;
1146                         count = 1;
1147                 } else if (strcmp(cp, "++") == 0) {
1148                         positive = TRUE;
1149                         count = 2;
1150                 } else {
1151                         error(_("illegal CORRECTION field on Leap line"));
1152                         return;
1153                 }
1154                 if ((lp = byword(fields[LP_ROLL], leap_types)) == NULL) {
1155                         error(_("illegal Rolling/Stationary field on Leap line"));
1156                         return;
1157                 }
1158                 leapadd(tadd(t, tod), positive, lp->l_value, count);
1159         }
1160 }
1161
1162 static void
1163 inlink(fields, nfields)
1164 register char ** const  fields;
1165 const int               nfields;
1166 {
1167         struct link     l;
1168
1169         if (nfields != LINK_FIELDS) {
1170                 error(_("wrong number of fields on Link line"));
1171                 return;
1172         }
1173         if (*fields[LF_FROM] == '\0') {
1174                 error(_("blank FROM field on Link line"));
1175                 return;
1176         }
1177         if (*fields[LF_TO] == '\0') {
1178                 error(_("blank TO field on Link line"));
1179                 return;
1180         }
1181         l.l_filename = filename;
1182         l.l_linenum = linenum;
1183         l.l_from = ecpyalloc(fields[LF_FROM]);
1184         l.l_to = ecpyalloc(fields[LF_TO]);
1185         links = (struct link *) (void *) erealloc((char *) links,
1186                 (int) ((nlinks + 1) * sizeof *links));
1187         links[nlinks++] = l;
1188 }
1189
1190 static void
1191 rulesub(rp, loyearp, hiyearp, typep, monthp, dayp, timep)
1192 register struct rule * const    rp;
1193 const char * const              loyearp;
1194 const char * const              hiyearp;
1195 const char * const              typep;
1196 const char * const              monthp;
1197 const char * const              dayp;
1198 const char * const              timep;
1199 {
1200         register const struct lookup *  lp;
1201         register const char *           cp;
1202         register char *                 dp;
1203         register char *                 ep;
1204
1205         if ((lp = byword(monthp, mon_names)) == NULL) {
1206                 error(_("invalid month name"));
1207                 return;
1208         }
1209         rp->r_month = lp->l_value;
1210         rp->r_todisstd = FALSE;
1211         rp->r_todisgmt = FALSE;
1212         dp = ecpyalloc(timep);
1213         if (*dp != '\0') {
1214                 ep = dp + strlen(dp) - 1;
1215                 switch (lowerit(*ep)) {
1216                         case 's':       /* Standard */
1217                                 rp->r_todisstd = TRUE;
1218                                 rp->r_todisgmt = FALSE;
1219                                 *ep = '\0';
1220                                 break;
1221                         case 'w':       /* Wall */
1222                                 rp->r_todisstd = FALSE;
1223                                 rp->r_todisgmt = FALSE;
1224                                 *ep = '\0';
1225                                 break;
1226                         case 'g':       /* Greenwich */
1227                         case 'u':       /* Universal */
1228                         case 'z':       /* Zulu */
1229                                 rp->r_todisstd = TRUE;
1230                                 rp->r_todisgmt = TRUE;
1231                                 *ep = '\0';
1232                                 break;
1233                 }
1234         }
1235         rp->r_tod = gethms(dp, _("invalid time of day"), FALSE);
1236         ifree(dp);
1237         /*
1238         ** Year work.
1239         */
1240         cp = loyearp;
1241         lp = byword(cp, begin_years);
1242         if (lp != NULL) switch ((int) lp->l_value) {
1243                 case YR_MINIMUM:
1244                         rp->r_loyear = INT_MIN;
1245                         break;
1246                 case YR_MAXIMUM:
1247                         rp->r_loyear = INT_MAX;
1248                         break;
1249                 default:        /* "cannot happen" */
1250                         (void) fprintf(stderr,
1251                                 _("%s: panic: Invalid l_value %d\n"),
1252                                 progname, lp->l_value);
1253                         (void) exit(EXIT_FAILURE);
1254         } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_loyear) != 1) {
1255                 error(_("invalid starting year"));
1256                 return;
1257         } else if (noise)
1258                 if (rp->r_loyear < min_year_representable)
1259                         warning(_("starting year too low to be represented"));
1260                 else if (rp->r_loyear > max_year_representable)
1261                         warning(_("starting year too high to be represented"));
1262         cp = hiyearp;
1263         if ((lp = byword(cp, end_years)) != NULL) switch ((int) lp->l_value) {
1264                 case YR_MINIMUM:
1265                         rp->r_hiyear = INT_MIN;
1266                         break;
1267                 case YR_MAXIMUM:
1268                         rp->r_hiyear = INT_MAX;
1269                         break;
1270                 case YR_ONLY:
1271                         rp->r_hiyear = rp->r_loyear;
1272                         break;
1273                 default:        /* "cannot happen" */
1274                         (void) fprintf(stderr,
1275                                 _("%s: panic: Invalid l_value %d\n"),
1276                                 progname, lp->l_value);
1277                         (void) exit(EXIT_FAILURE);
1278         } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_hiyear) != 1) {
1279                 error(_("invalid ending year"));
1280                 return;
1281         } else if (noise)
1282                 if (rp->r_loyear < min_year_representable)
1283                         warning(_("starting year too low to be represented"));
1284                 else if (rp->r_loyear > max_year_representable)
1285                         warning(_("starting year too high to be represented"));
1286         if (rp->r_loyear > rp->r_hiyear) {
1287                 error(_("starting year greater than ending year"));
1288                 return;
1289         }
1290         if (*typep == '\0')
1291                 rp->r_yrtype = NULL;
1292         else {
1293                 if (rp->r_loyear == rp->r_hiyear) {
1294                         error(_("typed single year"));
1295                         return;
1296                 }
1297                 rp->r_yrtype = ecpyalloc(typep);
1298         }
1299         if (rp->r_loyear < min_year && rp->r_loyear > 0)
1300                 min_year = rp->r_loyear;
1301         /*
1302         ** Day work.
1303         ** Accept things such as:
1304         **      1
1305         **      last-Sunday
1306         **      Sun<=20
1307         **      Sun>=7
1308         */
1309         dp = ecpyalloc(dayp);
1310         if ((lp = byword(dp, lasts)) != NULL) {
1311                 rp->r_dycode = DC_DOWLEQ;
1312                 rp->r_wday = lp->l_value;
1313                 rp->r_dayofmonth = len_months[1][rp->r_month];
1314         } else {
1315                 if ((ep = strchr(dp, '<')) != 0)
1316                         rp->r_dycode = DC_DOWLEQ;
1317                 else if ((ep = strchr(dp, '>')) != 0)
1318                         rp->r_dycode = DC_DOWGEQ;
1319                 else {
1320                         ep = dp;
1321                         rp->r_dycode = DC_DOM;
1322                 }
1323                 if (rp->r_dycode != DC_DOM) {
1324                         *ep++ = 0;
1325                         if (*ep++ != '=') {
1326                                 error(_("invalid day of month"));
1327                                 ifree(dp);
1328                                 return;
1329                         }
1330                         if ((lp = byword(dp, wday_names)) == NULL) {
1331                                 error(_("invalid weekday name"));
1332                                 ifree(dp);
1333                                 return;
1334                         }
1335                         rp->r_wday = lp->l_value;
1336                 }
1337                 if (sscanf(ep, scheck(ep, "%d"), &rp->r_dayofmonth) != 1 ||
1338                         rp->r_dayofmonth <= 0 ||
1339                         (rp->r_dayofmonth > len_months[1][rp->r_month])) {
1340                                 error(_("invalid day of month"));
1341                                 ifree(dp);
1342                                 return;
1343                 }
1344         }
1345         ifree(dp);
1346 }
1347
1348 static void
1349 convert(val, buf)
1350 const long      val;
1351 char * const    buf;
1352 {
1353         register int    i;
1354         register long   shift;
1355
1356         for (i = 0, shift = 24; i < 4; ++i, shift -= 8)
1357                 buf[i] = val >> shift;
1358 }
1359
1360 static void
1361 puttzcode(val, fp)
1362 const long      val;
1363 FILE * const    fp;
1364 {
1365         char    buf[4];
1366
1367         convert(val, buf);
1368         (void) fwrite((void *) buf, (size_t) sizeof buf, (size_t) 1, fp);
1369 }
1370
1371 static int
1372 atcomp(avp, bvp)
1373 void *  avp;
1374 void *  bvp;
1375 {
1376         if (((struct attype *) avp)->at < ((struct attype *) bvp)->at)
1377                 return -1;
1378         else if (((struct attype *) avp)->at > ((struct attype *) bvp)->at)
1379                 return 1;
1380         else    return 0;
1381 }
1382
1383 static void
1384 writezone(name)
1385 const char * const      name;
1386 {
1387         register FILE *         fp;
1388         register int            i, j;
1389         static char *           fullname;
1390         static struct tzhead    tzh;
1391         time_t                  ats[TZ_MAX_TIMES];
1392         unsigned char           types[TZ_MAX_TIMES];
1393
1394         /*
1395         ** Sort.
1396         */
1397         if (timecnt > 1)
1398                 (void) qsort((void *) attypes, (size_t) timecnt,
1399                         (size_t) sizeof *attypes, atcomp);
1400         /*
1401         ** Optimize.
1402         */
1403         {
1404                 int     fromi;
1405                 int     toi;
1406
1407                 toi = 0;
1408                 fromi = 0;
1409                 while (fromi < timecnt && attypes[fromi].at < min_time)
1410                         ++fromi;
1411                 if (isdsts[0] == 0)
1412                         while (fromi < timecnt && attypes[fromi].type == 0)
1413                                 ++fromi;        /* handled by default rule */
1414                 for ( ; fromi < timecnt; ++fromi) {
1415                         if (toi != 0
1416                             && ((attypes[fromi].at
1417                                  + gmtoffs[attypes[toi - 1].type])
1418                                 <= (attypes[toi - 1].at
1419                                     + gmtoffs[toi == 1 ? 0
1420                                               : attypes[toi - 2].type]))) {
1421                                 attypes[toi - 1].type = attypes[fromi].type;
1422                                 continue;
1423                         }
1424                         if (toi == 0 ||
1425                                 attypes[toi - 1].type != attypes[fromi].type)
1426                                         attypes[toi++] = attypes[fromi];
1427                 }
1428                 timecnt = toi;
1429         }
1430         /*
1431         ** Transfer.
1432         */
1433         for (i = 0; i < timecnt; ++i) {
1434                 ats[i] = attypes[i].at;
1435                 types[i] = attypes[i].type;
1436         }
1437         fullname = erealloc(fullname,
1438                 (int) (strlen(directory) + 1 + strlen(name) + 1));
1439         (void) sprintf(fullname, "%s/%s", directory, name);
1440         /*
1441         ** Remove old file, if any, to snap links.
1442         */
1443         if (!itsdir(fullname) && remove(fullname) != 0 && errno != ENOENT) {
1444                 const char *e = strerror(errno);
1445
1446                 (void) fprintf(stderr, _("%s: Can't remove %s: %s\n"),
1447                         progname, fullname, e);
1448                 (void) exit(EXIT_FAILURE);
1449         }
1450         if ((fp = fopen(fullname, "wb")) == NULL) {
1451                 if (mkdirs(fullname) != 0)
1452                         (void) exit(EXIT_FAILURE);
1453                 if ((fp = fopen(fullname, "wb")) == NULL) {
1454                         const char *e = strerror(errno);
1455
1456                         (void) fprintf(stderr, _("%s: Can't create %s: %s\n"),
1457                                 progname, fullname, e);
1458                         (void) exit(EXIT_FAILURE);
1459                 }
1460         }
1461         convert(eitol(typecnt), tzh.tzh_ttisgmtcnt);
1462         convert(eitol(typecnt), tzh.tzh_ttisstdcnt);
1463         convert(eitol(leapcnt), tzh.tzh_leapcnt);
1464         convert(eitol(timecnt), tzh.tzh_timecnt);
1465         convert(eitol(typecnt), tzh.tzh_typecnt);
1466         convert(eitol(charcnt), tzh.tzh_charcnt);
1467 #define DO(field)       (void) fwrite((void *) tzh.field, (size_t) sizeof tzh.field, (size_t) 1, fp)
1468         DO(tzh_reserved);
1469         DO(tzh_ttisgmtcnt);
1470         DO(tzh_ttisstdcnt);
1471         DO(tzh_leapcnt);
1472         DO(tzh_timecnt);
1473         DO(tzh_typecnt);
1474         DO(tzh_charcnt);
1475 #undef DO
1476         for (i = 0; i < timecnt; ++i) {
1477                 j = leapcnt;
1478                 while (--j >= 0)
1479                         if (ats[i] >= trans[j]) {
1480                                 ats[i] = tadd(ats[i], corr[j]);
1481                                 break;
1482                         }
1483                 puttzcode((long) ats[i], fp);
1484         }
1485         if (timecnt > 0)
1486                 (void) fwrite((void *) types, (size_t) sizeof types[0],
1487                         (size_t) timecnt, fp);
1488         for (i = 0; i < typecnt; ++i) {
1489                 puttzcode((long) gmtoffs[i], fp);
1490                 (void) putc(isdsts[i], fp);
1491                 (void) putc(abbrinds[i], fp);
1492         }
1493         if (charcnt != 0)
1494                 (void) fwrite((void *) chars, (size_t) sizeof chars[0],
1495                         (size_t) charcnt, fp);
1496         for (i = 0; i < leapcnt; ++i) {
1497                 if (roll[i]) {
1498                         if (timecnt == 0 || trans[i] < ats[0]) {
1499                                 j = 0;
1500                                 while (isdsts[j])
1501                                         if (++j >= typecnt) {
1502                                                 j = 0;
1503                                                 break;
1504                                         }
1505                         } else {
1506                                 j = 1;
1507                                 while (j < timecnt && trans[i] >= ats[j])
1508                                         ++j;
1509                                 j = types[j - 1];
1510                         }
1511                         puttzcode((long) tadd(trans[i], -gmtoffs[j]), fp);
1512                 } else  puttzcode((long) trans[i], fp);
1513                 puttzcode((long) corr[i], fp);
1514         }
1515         for (i = 0; i < typecnt; ++i)
1516                 (void) putc(ttisstds[i], fp);
1517         for (i = 0; i < typecnt; ++i)
1518                 (void) putc(ttisgmts[i], fp);
1519         if (ferror(fp) || fclose(fp)) {
1520                 (void) fprintf(stderr, _("%s: Error writing %s\n"),
1521                         progname, fullname);
1522                 (void) exit(EXIT_FAILURE);
1523         }
1524 }
1525
1526 static void
1527 doabbr(abbr, format, letters, isdst)
1528 char * const            abbr;
1529 const char * const      format;
1530 const char * const      letters;
1531 const int               isdst;
1532 {
1533         if (strchr(format, '/') == NULL) {
1534                 if (letters == NULL)
1535                         (void) strcpy(abbr, format);
1536                 else    (void) sprintf(abbr, format, letters);
1537         } else if (isdst)
1538                 (void) strcpy(abbr, strchr(format, '/') + 1);
1539         else {
1540                 (void) strcpy(abbr, format);
1541                 *strchr(abbr, '/') = '\0';
1542         }
1543 }
1544
1545 static void
1546 outzone(zpfirst, zonecount)
1547 const struct zone * const       zpfirst;
1548 const int                       zonecount;
1549 {
1550         register const struct zone *    zp;
1551         register struct rule *          rp;
1552         register int                    i, j;
1553         register int                    usestart, useuntil;
1554         register time_t                 starttime, untiltime;
1555         register long                   gmtoff;
1556         register long                   stdoff;
1557         register int                    year;
1558         register long                   startoff;
1559         register int                    startttisstd;
1560         register int                    startttisgmt;
1561         register int                    type;
1562         char                            startbuf[BUFSIZ];
1563
1564         INITIALIZE(untiltime);
1565         INITIALIZE(starttime);
1566         /*
1567         ** Now. . .finally. . .generate some useful data!
1568         */
1569         timecnt = 0;
1570         typecnt = 0;
1571         charcnt = 0;
1572         /*
1573         ** A guess that may well be corrected later.
1574         */
1575         stdoff = 0;
1576         /*
1577         ** Thanks to Earl Chew (earl@dnd.icp.nec.com.au)
1578         ** for noting the need to unconditionally initialize startttisstd.
1579         */
1580         startttisstd = FALSE;
1581         startttisgmt = FALSE;
1582         for (i = 0; i < zonecount; ++i) {
1583                 zp = &zpfirst[i];
1584                 usestart = i > 0 && (zp - 1)->z_untiltime > min_time;
1585                 useuntil = i < (zonecount - 1);
1586                 if (useuntil && zp->z_untiltime <= min_time)
1587                         continue;
1588                 gmtoff = zp->z_gmtoff;
1589                 eat(zp->z_filename, zp->z_linenum);
1590                 *startbuf = '\0';
1591                 startoff = zp->z_gmtoff;
1592                 if (zp->z_nrules == 0) {
1593                         stdoff = zp->z_stdoff;
1594                         doabbr(startbuf, zp->z_format,
1595                                 (char *) NULL, stdoff != 0);
1596                         type = addtype(oadd(zp->z_gmtoff, stdoff),
1597                                 startbuf, stdoff != 0, startttisstd,
1598                                 startttisgmt);
1599                         if (usestart) {
1600                                 addtt(starttime, type);
1601                                 usestart = FALSE;
1602                         }
1603                         else if (stdoff != 0)
1604                                 addtt(min_time, type);
1605                 } else for (year = min_year; year <= max_year; ++year) {
1606                         if (useuntil && year > zp->z_untilrule.r_hiyear)
1607                                 break;
1608                         /*
1609                         ** Mark which rules to do in the current year.
1610                         ** For those to do, calculate rpytime(rp, year);
1611                         */
1612                         for (j = 0; j < zp->z_nrules; ++j) {
1613                                 rp = &zp->z_rules[j];
1614                                 eats(zp->z_filename, zp->z_linenum,
1615                                         rp->r_filename, rp->r_linenum);
1616                                 rp->r_todo = year >= rp->r_loyear &&
1617                                                 year <= rp->r_hiyear &&
1618                                                 yearistype(year, rp->r_yrtype);
1619                                 if (rp->r_todo)
1620                                         rp->r_temp = rpytime(rp, year);
1621                         }
1622                         for ( ; ; ) {
1623                                 register int    k;
1624                                 register time_t jtime, ktime;
1625                                 register long   offset;
1626                                 char            buf[BUFSIZ];
1627
1628                                 INITIALIZE(ktime);
1629                                 if (useuntil) {
1630                                         /*
1631                                         ** Turn untiltime into GMT
1632                                         ** assuming the current gmtoff and
1633                                         ** stdoff values.
1634                                         */
1635                                         untiltime = zp->z_untiltime;
1636                                         if (!zp->z_untilrule.r_todisgmt)
1637                                                 untiltime = tadd(untiltime,
1638                                                         -gmtoff);
1639                                         if (!zp->z_untilrule.r_todisstd)
1640                                                 untiltime = tadd(untiltime,
1641                                                         -stdoff);
1642                                 }
1643                                 /*
1644                                 ** Find the rule (of those to do, if any)
1645                                 ** that takes effect earliest in the year.
1646                                 */
1647                                 k = -1;
1648                                 for (j = 0; j < zp->z_nrules; ++j) {
1649                                         rp = &zp->z_rules[j];
1650                                         if (!rp->r_todo)
1651                                                 continue;
1652                                         eats(zp->z_filename, zp->z_linenum,
1653                                                 rp->r_filename, rp->r_linenum);
1654                                         offset = rp->r_todisgmt ? 0 : gmtoff;
1655                                         if (!rp->r_todisstd)
1656                                                 offset = oadd(offset, stdoff);
1657                                         jtime = rp->r_temp;
1658                                         if (jtime == min_time ||
1659                                                 jtime == max_time)
1660                                                         continue;
1661                                         jtime = tadd(jtime, -offset);
1662                                         if (k < 0 || jtime < ktime) {
1663                                                 k = j;
1664                                                 ktime = jtime;
1665                                         }
1666                                 }
1667                                 if (k < 0)
1668                                         break;  /* go on to next year */
1669                                 rp = &zp->z_rules[k];
1670                                 rp->r_todo = FALSE;
1671                                 if (useuntil && ktime >= untiltime)
1672                                         break;
1673                                 stdoff = rp->r_stdoff;
1674                                 if (usestart && ktime == starttime)
1675                                         usestart = FALSE;
1676                                 if (usestart) {
1677                                         if (ktime < starttime) {
1678                                                 startoff = oadd(zp->z_gmtoff,
1679                                                         stdoff);
1680                                                 doabbr(startbuf, zp->z_format,
1681                                                         rp->r_abbrvar,
1682                                                         rp->r_stdoff != 0);
1683                                                 continue;
1684                                         }
1685                                         if (*startbuf == '\0' &&
1686                                             startoff == oadd(zp->z_gmtoff,
1687                                             stdoff)) {
1688                                                 doabbr(startbuf, zp->z_format,
1689                                                         rp->r_abbrvar,
1690                                                         rp->r_stdoff != 0);
1691                                         }
1692                                 }
1693                                 eats(zp->z_filename, zp->z_linenum,
1694                                         rp->r_filename, rp->r_linenum);
1695                                 doabbr(buf, zp->z_format, rp->r_abbrvar,
1696                                         rp->r_stdoff != 0);
1697                                 offset = oadd(zp->z_gmtoff, rp->r_stdoff);
1698                                 type = addtype(offset, buf, rp->r_stdoff != 0,
1699                                         rp->r_todisstd, rp->r_todisgmt);
1700                                 addtt(ktime, type);
1701                         }
1702                 }
1703                 if (usestart) {
1704                         if (*startbuf == '\0' &&
1705                                 zp->z_format != NULL &&
1706                                 strchr(zp->z_format, '%') == NULL &&
1707                                 strchr(zp->z_format, '/') == NULL)
1708                                         (void) strcpy(startbuf, zp->z_format);
1709                         eat(zp->z_filename, zp->z_linenum);
1710                         if (*startbuf == '\0')
1711 error(_("can't determine time zone abbreviation to use just after until time"));
1712                         else    addtt(starttime,
1713                                         addtype(startoff, startbuf,
1714                                                 startoff != zp->z_gmtoff,
1715                                                 startttisstd,
1716                                                 startttisgmt));
1717                 }
1718                 /*
1719                 ** Now we may get to set starttime for the next zone line.
1720                 */
1721                 if (useuntil) {
1722                         startttisstd = zp->z_untilrule.r_todisstd;
1723                         startttisgmt = zp->z_untilrule.r_todisgmt;
1724                         starttime = zp->z_untiltime;
1725                         if (!startttisstd)
1726                                 starttime = tadd(starttime, -stdoff);
1727                         if (!startttisgmt)
1728                                 starttime = tadd(starttime, -gmtoff);
1729                 }
1730         }
1731         writezone(zpfirst->z_name);
1732 }
1733
1734 static void
1735 addtt(starttime, type)
1736 const time_t    starttime;
1737 int             type;
1738 {
1739         if (starttime <= min_time ||
1740                 (timecnt == 1 && attypes[0].at < min_time)) {
1741                 gmtoffs[0] = gmtoffs[type];
1742                 isdsts[0] = isdsts[type];
1743                 ttisstds[0] = ttisstds[type];
1744                 ttisgmts[0] = ttisgmts[type];
1745                 if (abbrinds[type] != 0)
1746                         (void) strcpy(chars, &chars[abbrinds[type]]);
1747                 abbrinds[0] = 0;
1748                 charcnt = strlen(chars) + 1;
1749                 typecnt = 1;
1750                 timecnt = 0;
1751                 type = 0;
1752         }
1753         if (timecnt >= TZ_MAX_TIMES) {
1754                 error(_("too many transitions?!"));
1755                 (void) exit(EXIT_FAILURE);
1756         }
1757         attypes[timecnt].at = starttime;
1758         attypes[timecnt].type = type;
1759         ++timecnt;
1760 }
1761
1762 static int
1763 addtype(gmtoff, abbr, isdst, ttisstd, ttisgmt)
1764 const long              gmtoff;
1765 const char * const      abbr;
1766 const int               isdst;
1767 const int               ttisstd;
1768 const int               ttisgmt;
1769 {
1770         register int    i, j;
1771
1772         if (isdst != TRUE && isdst != FALSE) {
1773                 error(_("internal error - addtype called with bad isdst"));
1774                 (void) exit(EXIT_FAILURE);
1775         }
1776         if (ttisstd != TRUE && ttisstd != FALSE) {
1777                 error(_("internal error - addtype called with bad ttisstd"));
1778                 (void) exit(EXIT_FAILURE);
1779         }
1780         if (ttisgmt != TRUE && ttisgmt != FALSE) {
1781                 error(_("internal error - addtype called with bad ttisgmt"));
1782                 (void) exit(EXIT_FAILURE);
1783         }
1784         /*
1785         ** See if there's already an entry for this zone type.
1786         ** If so, just return its index.
1787         */
1788         for (i = 0; i < typecnt; ++i) {
1789                 if (gmtoff == gmtoffs[i] && isdst == isdsts[i] &&
1790                         strcmp(abbr, &chars[abbrinds[i]]) == 0 &&
1791                         ttisstd == ttisstds[i] &&
1792                         ttisgmt == ttisgmts[i])
1793                                 return i;
1794         }
1795         /*
1796         ** There isn't one; add a new one, unless there are already too
1797         ** many.
1798         */
1799         if (typecnt >= TZ_MAX_TYPES) {
1800                 error(_("too many local time types"));
1801                 (void) exit(EXIT_FAILURE);
1802         }
1803         gmtoffs[i] = gmtoff;
1804         isdsts[i] = isdst;
1805         ttisstds[i] = ttisstd;
1806         ttisgmts[i] = ttisgmt;
1807
1808         for (j = 0; j < charcnt; ++j)
1809                 if (strcmp(&chars[j], abbr) == 0)
1810                         break;
1811         if (j == charcnt)
1812                 newabbr(abbr);
1813         abbrinds[i] = j;
1814         ++typecnt;
1815         return i;
1816 }
1817
1818 static void
1819 leapadd(t, positive, rolling, count)
1820 const time_t    t;
1821 const int       positive;
1822 const int       rolling;
1823 int             count;
1824 {
1825         register int    i, j;
1826
1827         if (leapcnt + (positive ? count : 1) > TZ_MAX_LEAPS) {
1828                 error(_("too many leap seconds"));
1829                 (void) exit(EXIT_FAILURE);
1830         }
1831         for (i = 0; i < leapcnt; ++i)
1832                 if (t <= trans[i]) {
1833                         if (t == trans[i]) {
1834                                 error(_("repeated leap second moment"));
1835                                 (void) exit(EXIT_FAILURE);
1836                         }
1837                         break;
1838                 }
1839         do {
1840                 for (j = leapcnt; j > i; --j) {
1841                         trans[j] = trans[j - 1];
1842                         corr[j] = corr[j - 1];
1843                         roll[j] = roll[j - 1];
1844                 }
1845                 trans[i] = t;
1846                 corr[i] = positive ? 1L : eitol(-count);
1847                 roll[i] = rolling;
1848                 ++leapcnt;
1849         } while (positive && --count != 0);
1850 }
1851
1852 static void
1853 adjleap P((void))
1854 {
1855         register int    i;
1856         register long   last = 0;
1857
1858         /*
1859         ** propagate leap seconds forward
1860         */
1861         for (i = 0; i < leapcnt; ++i) {
1862                 trans[i] = tadd(trans[i], last);
1863                 last = corr[i] += last;
1864         }
1865 }
1866
1867 static int
1868 yearistype(year, type)
1869 const int               year;
1870 const char * const      type;
1871 {
1872         static char *   buf;
1873         int             result;
1874
1875         if (type == NULL || *type == '\0')
1876                 return TRUE;
1877         buf = erealloc(buf, (int) (132 + strlen(yitcommand) + strlen(type)));
1878         (void) sprintf(buf, "%s %d %s", yitcommand, year, type);
1879         result = system(buf);
1880         if (result == 0)
1881                 return TRUE;
1882         if (result == (1 << 8))
1883                 return FALSE;
1884         error(_("Wild result from command execution"));
1885         (void) fprintf(stderr, _("%s: command was '%s', result was %d\n"),
1886                 progname, buf, result);
1887         for ( ; ; )
1888                 (void) exit(EXIT_FAILURE);
1889 }
1890
1891 static int
1892 lowerit(a)
1893 int     a;
1894 {
1895         a = (unsigned char) a;
1896         return (isascii(a) && isupper(a)) ? tolower(a) : a;
1897 }
1898
1899 static int
1900 ciequal(ap, bp)         /* case-insensitive equality */
1901 register const char *   ap;
1902 register const char *   bp;
1903 {
1904         while (lowerit(*ap) == lowerit(*bp++))
1905                 if (*ap++ == '\0')
1906                         return TRUE;
1907         return FALSE;
1908 }
1909
1910 static int
1911 itsabbr(abbr, word)
1912 register const char *   abbr;
1913 register const char *   word;
1914 {
1915         if (lowerit(*abbr) != lowerit(*word))
1916                 return FALSE;
1917         ++word;
1918         while (*++abbr != '\0')
1919                 do {
1920                         if (*word == '\0')
1921                                 return FALSE;
1922                 } while (lowerit(*word++) != lowerit(*abbr));
1923         return TRUE;
1924 }
1925
1926 static const struct lookup *
1927 byword(word, table)
1928 register const char * const             word;
1929 register const struct lookup * const    table;
1930 {
1931         register const struct lookup *  foundlp;
1932         register const struct lookup *  lp;
1933
1934         if (word == NULL || table == NULL)
1935                 return NULL;
1936         /*
1937         ** Look for exact match.
1938         */
1939         for (lp = table; lp->l_word != NULL; ++lp)
1940                 if (ciequal(word, lp->l_word))
1941                         return lp;
1942         /*
1943         ** Look for inexact match.
1944         */
1945         foundlp = NULL;
1946         for (lp = table; lp->l_word != NULL; ++lp)
1947                 if (itsabbr(word, lp->l_word))
1948                         if (foundlp == NULL)
1949                                 foundlp = lp;
1950                         else    return NULL;    /* multiple inexact matches */
1951         return foundlp;
1952 }
1953
1954 static char **
1955 getfields(cp)
1956 register char * cp;
1957 {
1958         register char *         dp;
1959         register char **        array;
1960         register int            nsubs;
1961
1962         if (cp == NULL)
1963                 return NULL;
1964         array = (char **) (void *)
1965                 emalloc((int) ((strlen(cp) + 1) * sizeof *array));
1966         nsubs = 0;
1967         for ( ; ; ) {
1968                 while (isascii(*cp) && isspace((unsigned char) *cp))
1969                         ++cp;
1970                 if (*cp == '\0' || *cp == '#')
1971                         break;
1972                 array[nsubs++] = dp = cp;
1973                 do {
1974                         if ((*dp = *cp++) != '"')
1975                                 ++dp;
1976                         else while ((*dp = *cp++) != '"')
1977                                 if (*dp != '\0')
1978                                         ++dp;
1979                                 else    error(_("Odd number of quotation marks"));
1980                 } while (*cp != '\0' && *cp != '#' &&
1981                         (!isascii(*cp) || !isspace((unsigned char) *cp)));
1982                 if (isascii(*cp) && isspace((unsigned char) *cp))
1983                         ++cp;
1984                 *dp = '\0';
1985         }
1986         array[nsubs] = NULL;
1987         return array;
1988 }
1989
1990 static long
1991 oadd(t1, t2)
1992 const long      t1;
1993 const long      t2;
1994 {
1995         register long   t;
1996
1997         t = t1 + t2;
1998         if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {
1999                 error(_("time overflow"));
2000                 (void) exit(EXIT_FAILURE);
2001         }
2002         return t;
2003 }
2004
2005 static time_t
2006 tadd(t1, t2)
2007 const time_t    t1;
2008 const long      t2;
2009 {
2010         register time_t t;
2011
2012         if (t1 == max_time && t2 > 0)
2013                 return max_time;
2014         if (t1 == min_time && t2 < 0)
2015                 return min_time;
2016         t = t1 + t2;
2017         if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {
2018                 error(_("time overflow"));
2019                 (void) exit(EXIT_FAILURE);
2020         }
2021         return t;
2022 }
2023
2024 /*
2025 ** Given a rule, and a year, compute the date - in seconds since January 1,
2026 ** 1970, 00:00 LOCAL time - in that year that the rule refers to.
2027 */
2028
2029 static time_t
2030 rpytime(rp, wantedy)
2031 register const struct rule * const      rp;
2032 register const int                      wantedy;
2033 {
2034         register int    y, m, i;
2035         register long   dayoff;                 /* with a nod to Margaret O. */
2036         register time_t t;
2037
2038         if (wantedy == INT_MIN)
2039                 return min_time;
2040         if (wantedy == INT_MAX)
2041                 return max_time;
2042         dayoff = 0;
2043         m = TM_JANUARY;
2044         y = EPOCH_YEAR;
2045         while (wantedy != y) {
2046                 if (wantedy > y) {
2047                         i = len_years[isleap(y)];
2048                         ++y;
2049                 } else {
2050                         --y;
2051                         i = -len_years[isleap(y)];
2052                 }
2053                 dayoff = oadd(dayoff, eitol(i));
2054         }
2055         while (m != rp->r_month) {
2056                 i = len_months[isleap(y)][m];
2057                 dayoff = oadd(dayoff, eitol(i));
2058                 ++m;
2059         }
2060         i = rp->r_dayofmonth;
2061         if (m == TM_FEBRUARY && i == 29 && !isleap(y)) {
2062                 if (rp->r_dycode == DC_DOWLEQ)
2063                         --i;
2064                 else {
2065                         error(_("use of 2/29 in non leap-year"));
2066                         (void) exit(EXIT_FAILURE);
2067                 }
2068         }
2069         --i;
2070         dayoff = oadd(dayoff, eitol(i));
2071         if (rp->r_dycode == DC_DOWGEQ || rp->r_dycode == DC_DOWLEQ) {
2072                 register long   wday;
2073
2074 #define LDAYSPERWEEK    ((long) DAYSPERWEEK)
2075                 wday = eitol(EPOCH_WDAY);
2076                 /*
2077                 ** Don't trust mod of negative numbers.
2078                 */
2079                 if (dayoff >= 0)
2080                         wday = (wday + dayoff) % LDAYSPERWEEK;
2081                 else {
2082                         wday -= ((-dayoff) % LDAYSPERWEEK);
2083                         if (wday < 0)
2084                                 wday += LDAYSPERWEEK;
2085                 }
2086                 while (wday != eitol(rp->r_wday))
2087                         if (rp->r_dycode == DC_DOWGEQ) {
2088                                 dayoff = oadd(dayoff, (long) 1);
2089                                 if (++wday >= LDAYSPERWEEK)
2090                                         wday = 0;
2091                                 ++i;
2092                         } else {
2093                                 dayoff = oadd(dayoff, (long) -1);
2094                                 if (--wday < 0)
2095                                         wday = LDAYSPERWEEK - 1;
2096                                 --i;
2097                         }
2098                 if (i < 0 || i >= len_months[isleap(y)][m]) {
2099                         error(_("no day in month matches rule"));
2100                         (void) exit(EXIT_FAILURE);
2101                 }
2102         }
2103         if (dayoff < 0 && !TYPE_SIGNED(time_t))
2104                 return min_time;
2105         t = (time_t) dayoff * SECSPERDAY;
2106         /*
2107         ** Cheap overflow check.
2108         */
2109         if (t / SECSPERDAY != dayoff)
2110                 return (dayoff > 0) ? max_time : min_time;
2111         return tadd(t, rp->r_tod);
2112 }
2113
2114 static void
2115 newabbr(string)
2116 const char * const      string;
2117 {
2118         register int    i;
2119
2120         i = strlen(string) + 1;
2121         if (charcnt + i > TZ_MAX_CHARS) {
2122                 error(_("too many, or too long, time zone abbreviations"));
2123                 (void) exit(EXIT_FAILURE);
2124         }
2125         (void) strcpy(&chars[charcnt], string);
2126         charcnt += eitol(i);
2127 }
2128
2129 static int
2130 mkdirs(argname)
2131 char * const    argname;
2132 {
2133         register char * name;
2134         register char * cp;
2135
2136         if (argname == NULL || *argname == '\0')
2137                 return 0;
2138         cp = name = ecpyalloc(argname);
2139         while ((cp = strchr(cp + 1, '/')) != 0) {
2140                 *cp = '\0';
2141 #ifndef unix
2142                 /*
2143                 ** DOS drive specifier?
2144                 */
2145                 if (isalpha((unsigned char) name[0]) &&
2146                         name[1] == ':' && name[2] == '\0') {
2147                                 *cp = '/';
2148                                 continue;
2149                 }
2150 #endif /* !defined unix */
2151                 if (!itsdir(name)) {
2152                         /*
2153                         ** It doesn't seem to exist, so we try to create it.
2154                         ** Creation may fail because of the directory being
2155                         ** created by some other multiprocessor, so we get
2156                         ** to do extra checking.
2157                         */
2158                         if (mkdir(name, S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH) != 0) {
2159                                 const char *e = strerror(errno);
2160
2161                                 if (errno != EEXIST || !itsdir(name)) {
2162                                         (void) fprintf(stderr,
2163 _("%s: Can't create directory %s: %s\n"),
2164                                                 progname, name, e);
2165                                         ifree(name);
2166                                         return -1;
2167                                 }
2168                         }
2169                 }
2170                 *cp = '/';
2171         }
2172         ifree(name);
2173         return 0;
2174 }
2175
2176 static long
2177 eitol(i)
2178 const int       i;
2179 {
2180         long    l;
2181
2182         l = i;
2183         if ((i < 0 && l >= 0) || (i == 0 && l != 0) || (i > 0 && l <= 0)) {
2184                 (void) fprintf(stderr,
2185                         _("%s: %d did not sign extend correctly\n"),
2186                         progname, i);
2187                 (void) exit(EXIT_FAILURE);
2188         }
2189         return l;
2190 }
2191
2192 /*
2193 ** UNIX was a registered trademark of UNIX System Laboratories in 1993.
2194 */