usr.sbin/zic/zic.c

   1 #ifndef lint
   2 #ifndef NOID
   3 static char     elsieid[] = "@(#)zic.c  7.96";
   4 #endif /* !defined NOID */
   5 #endif /* !defined lint */
   6
   7 /*
   8  * @(#)zic.c    7.96
   9  * $FreeBSD: src/usr.sbin/zic/zic.c,v 1.11 1999/08/28 01:21:20 peter Exp $
  10  * $DragonFly: src/usr.sbin/zic/zic.c,v 1.2 2003/06/17 04:30:05 dillon Exp $
  11  */
  12 #include "private.h"
  13 #include "tzfile.h"
  14 #include <err.h>
  15 #include <locale.h>
  16 #include <sys/stat.h>                   /* for umask manifest constants */
  17 #include <sys/types.h>
  18 #include <unistd.h>
  19
  20 /*
  21 ** On some ancient hosts, predicates like `isspace(C)' are defined
  22 ** only if isascii(C) || C == EOF.  Modern hosts obey the C Standard,
  23 ** which says they are defined only if C == ((unsigned char) C) || C == EOF.
  24 ** Neither the C Standard nor Posix require that `isascii' exist.
  25 ** For portability, we check both ancient and modern requirements.
  26 ** If isascii is not defined, the isascii check succeeds trivially.
  27 */
  28 #include "ctype.h"
  29 #ifndef isascii
  30 #define isascii(x) 1
  31 #endif
  32
  33 struct rule {
  34         const char *    r_filename;
  35         int             r_linenum;
  36         const char *    r_name;
  37
  38         int             r_loyear;       /* for example, 1986 */
  39         int             r_hiyear;       /* for example, 1986 */
  40         const char *    r_yrtype;
  41
  42         int             r_month;        /* 0..11 */
  43
  44         int             r_dycode;       /* see below */
  45         int             r_dayofmonth;
  46         int             r_wday;
  47
  48         long            r_tod;          /* time from midnight */
  49         int             r_todisstd;     /* above is standard time if TRUE */
  50                                         /* or wall clock time if FALSE */
  51         int             r_todisgmt;     /* above is GMT if TRUE */
  52                                         /* or local time if FALSE */
  53         long            r_stdoff;       /* offset from standard time */
  54         const char *    r_abbrvar;      /* variable part of abbreviation */
  55
  56         int             r_todo;         /* a rule to do (used in outzone) */
  57         time_t          r_temp;         /* used in outzone */
  58 };
  59
  60 /*
  61 **      r_dycode                r_dayofmonth    r_wday
  62 */
  63
  64 #define DC_DOM          0       /* 1..31 */     /* unused */
  65 #define DC_DOWGEQ       1       /* 1..31 */     /* 0..6 (Sun..Sat) */
  66 #define DC_DOWLEQ       2       /* 1..31 */     /* 0..6 (Sun..Sat) */
  67
  68 struct zone {
  69         const char *    z_filename;
  70         int             z_linenum;
  71
  72         const char *    z_name;
  73         long            z_gmtoff;
  74         const char *    z_rule;
  75         const char *    z_format;
  76
  77         long            z_stdoff;
  78
  79         struct rule *   z_rules;
  80         int             z_nrules;
  81
  82         struct rule     z_untilrule;
  83         time_t          z_untiltime;
  84 };
  85
  86 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 void     setgroup P((gid_t *flag, const char *name));
 129 static void     setuser P((uid_t *flag, const char *name));
 130 static time_t   tadd P((time_t t1, long t2));
 131 static void     usage P((void));
 132 static void     writezone P((const char * name));
 133 static int      yearistype P((int year, const char * type));
 134
 135 #if !(HAVE_STRERROR - 0)
 136 static char *   strerror P((int));
 137 #endif /* !(HAVE_STRERROR - 0) */
 138
 139 static int              charcnt;
 140 static int              errors;
 141 static const char *     filename;
 142 static int              leapcnt;
 143 static int              linenum;
 144 static time_t           max_time;
 145 static int              max_year;
 146 static int              max_year_representable;
 147 static time_t           min_time;
 148 static int              min_year;
 149 static int              min_year_representable;
 150 static int              noise;
 151 static const char *     rfilename;
 152 static int              rlinenum;
 153 static int              timecnt;
 154 static int              typecnt;
 155
 156 /*
 157 ** Line codes.
 158 */
 159
 160 #define LC_RULE         0
 161 #define LC_ZONE         1
 162 #define LC_LINK         2
 163 #define LC_LEAP         3
 164
 165 /*
 166 ** Which fields are which on a Zone line.
 167 */
 168
 169 #define ZF_NAME         1
 170 #define ZF_GMTOFF       2
 171 #define ZF_RULE         3
 172 #define ZF_FORMAT       4
 173 #define ZF_TILYEAR      5
 174 #define ZF_TILMONTH     6
 175 #define ZF_TILDAY       7
 176 #define ZF_TILTIME      8
 177 #define ZONE_MINFIELDS  5
 178 #define ZONE_MAXFIELDS  9
 179
 180 /*
 181 ** Which fields are which on a Zone continuation line.
 182 */
 183
 184 #define ZFC_GMTOFF      0
 185 #define ZFC_RULE        1
 186 #define ZFC_FORMAT      2
 187 #define ZFC_TILYEAR     3
 188 #define ZFC_TILMONTH    4
 189 #define ZFC_TILDAY      5
 190 #define ZFC_TILTIME     6
 191 #define ZONEC_MINFIELDS 3
 192 #define ZONEC_MAXFIELDS 7
 193
 194 /*
 195 ** Which files are which on a Rule line.
 196 */
 197
 198 #define RF_NAME         1
 199 #define RF_LOYEAR       2
 200 #define RF_HIYEAR       3
 201 #define RF_COMMAND      4
 202 #define RF_MONTH        5
 203 #define RF_DAY          6
 204 #define RF_TOD          7
 205 #define RF_STDOFF       8
 206 #define RF_ABBRVAR      9
 207 #define RULE_FIELDS     10
 208
 209 /*
 210 ** Which fields are which on a Link line.
 211 */
 212
 213 #define LF_FROM         1
 214 #define LF_TO           2
 215 #define LINK_FIELDS     3
 216
 217 /*
 218 ** Which fields are which on a Leap line.
 219 */
 220
 221 #define LP_YEAR         1
 222 #define LP_MONTH        2
 223 #define LP_DAY          3
 224 #define LP_TIME         4
 225 #define LP_CORR         5
 226 #define LP_ROLL         6
 227 #define LEAP_FIELDS     7
 228
 229 /*
 230 ** Year synonyms.
 231 */
 232
 233 #define YR_MINIMUM      0
 234 #define YR_MAXIMUM      1
 235 #define YR_ONLY         2
 236
 237 static struct rule *    rules;
 238 static int              nrules; /* number of rules */
 239
 240 static struct zone *    zones;
 241 static int              nzones; /* number of zones */
 242
 243 struct link {
 244         const char *    l_filename;
 245         int             l_linenum;
 246         const char *    l_from;
 247         const char *    l_to;
 248 };
 249
 250 static struct link *    links;
 251 static int              nlinks;
 252
 253 struct lookup {
 254         const char *    l_word;
 255         const int       l_value;
 256 };
 257
 258 static struct lookup const *    byword P((const char * string,
 259                                         const struct lookup * lp));
 260
 261 static struct lookup const      line_codes[] = {
 262         { "Rule",       LC_RULE },
 263         { "Zone",       LC_ZONE },
 264         { "Link",       LC_LINK },
 265         { "Leap",       LC_LEAP },
 266         { NULL,         0}
 267 };
 268
 269 static struct lookup const      mon_names[] = {
 270         { "January",    TM_JANUARY },
 271         { "February",   TM_FEBRUARY },
 272         { "March",      TM_MARCH },
 273         { "April",      TM_APRIL },
 274         { "May",        TM_MAY },
 275         { "June",       TM_JUNE },
 276         { "July",       TM_JULY },
 277         { "August",     TM_AUGUST },
 278         { "September",  TM_SEPTEMBER },
 279         { "October",    TM_OCTOBER },
 280         { "November",   TM_NOVEMBER },
 281         { "December",   TM_DECEMBER },
 282         { NULL,         0 }
 283 };
 284
 285 static struct lookup const      wday_names[] = {
 286         { "Sunday",     TM_SUNDAY },
 287         { "Monday",     TM_MONDAY },
 288         { "Tuesday",    TM_TUESDAY },
 289         { "Wednesday",  TM_WEDNESDAY },
 290         { "Thursday",   TM_THURSDAY },
 291         { "Friday",     TM_FRIDAY },
 292         { "Saturday",   TM_SATURDAY },
 293         { NULL,         0 }
 294 };
 295
 296 static struct lookup const      lasts[] = {
 297         { "last-Sunday",        TM_SUNDAY },
 298         { "last-Monday",        TM_MONDAY },
 299         { "last-Tuesday",       TM_TUESDAY },
 300         { "last-Wednesday",     TM_WEDNESDAY },
 301         { "last-Thursday",      TM_THURSDAY },
 302         { "last-Friday",        TM_FRIDAY },
 303         { "last-Saturday",      TM_SATURDAY },
 304         { NULL,                 0 }
 305 };
 306
 307 static struct lookup const      begin_years[] = {
 308         { "minimum",    YR_MINIMUM },
 309         { "maximum",    YR_MAXIMUM },
 310         { NULL,         0 }
 311 };
 312
 313 static struct lookup const      end_years[] = {
 314         { "minimum",    YR_MINIMUM },
 315         { "maximum",    YR_MAXIMUM },
 316         { "only",       YR_ONLY },
 317         { NULL,         0 }
 318 };
 319
 320 static struct lookup const      leap_types[] = {
 321         { "Rolling",    TRUE },
 322         { "Stationary", FALSE },
 323         { NULL,         0 }
 324 };
 325
 326 static const int        len_months[2][MONSPERYEAR] = {
 327         { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
 328         { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
 329 };
 330
 331 static const int        len_years[2] = {
 332         DAYSPERNYEAR, DAYSPERLYEAR
 333 };
 334
 335 static struct attype {
 336         time_t          at;
 337         unsigned char   type;
 338 }                       attypes[TZ_MAX_TIMES];
 339 static long             gmtoffs[TZ_MAX_TYPES];
 340 static char             isdsts[TZ_MAX_TYPES];
 341 static unsigned char    abbrinds[TZ_MAX_TYPES];
 342 static char             ttisstds[TZ_MAX_TYPES];
 343 static char             ttisgmts[TZ_MAX_TYPES];
 344 static char             chars[TZ_MAX_CHARS];
 345 static time_t           trans[TZ_MAX_LEAPS];
 346 static long             corr[TZ_MAX_LEAPS];
 347 static char             roll[TZ_MAX_LEAPS];
 348
 349 /*
 350 ** Memory allocation.
 351 */
 352
 353 static char *
 354 memcheck(ptr)
 355 char * const    ptr;
 356 {
 357         if (ptr == NULL)
 358                 errx(EXIT_FAILURE, _("memory exhausted"));
 359         return ptr;
 360 }
 361
 362 #define emalloc(size)           memcheck(imalloc(size))
 363 #define erealloc(ptr, size)     memcheck(irealloc((ptr), (size)))
 364 #define ecpyalloc(ptr)          memcheck(icpyalloc(ptr))
 365 #define ecatalloc(oldp, newp)   memcheck(icatalloc((oldp), (newp)))
 366
 367 /*
 368 ** Error handling.
 369 */
 370
 371 #if !(HAVE_STRERROR - 0)
 372 static char *
 373 strerror(errnum)
 374 int     errnum;
 375 {
 376         extern char *   sys_errlist[];
 377         extern int      sys_nerr;
 378
 379         return (errnum > 0 && errnum <= sys_nerr) ?
 380                 sys_errlist[errnum] : _("Unknown system error");
 381 }
 382 #endif /* !(HAVE_STRERROR - 0) */
 383
 384 static void
 385 eats(name, num, rname, rnum)
 386 const char * const      name;
 387 const int               num;
 388 const char * const      rname;
 389 const int               rnum;
 390 {
 391         filename = name;
 392         linenum = num;
 393         rfilename = rname;
 394         rlinenum = rnum;
 395 }
 396
 397 static void
 398 eat(name, num)
 399 const char * const      name;
 400 const int               num;
 401 {
 402         eats(name, num, (char *) NULL, -1);
 403 }
 404
 405 static void
 406 error(string)
 407 const char * const      string;
 408 {
 409         /*
 410         ** Match the format of "cc" to allow sh users to
 411         **      zic ... 2>&1 | error -t "*" -v
 412         ** on BSD systems.
 413         */
 414         (void) fprintf(stderr, _("\"%s\", line %d: %s"),
 415                 filename, linenum, string);
 416         if (rfilename != NULL)
 417                 (void) fprintf(stderr, _(" (rule from \"%s\", line %d)"),
 418                         rfilename, rlinenum);
 419         (void) fprintf(stderr, "\n");
 420         ++errors;
 421 }
 422
 423 static void
 424 warning(string)
 425 const char * const      string;
 426 {
 427         char *  cp;
 428
 429         cp = ecpyalloc(_("warning: "));
 430         cp = ecatalloc(cp, string);
 431         error(cp);
 432         ifree(cp);
 433         --errors;
 434 }
 435
 436 static void
 437 usage P((void))
 438 {
 439         (void) fprintf(stderr, "%s\n%s\n",
 440 _("usage: zic [-s] [-v] [-l localtime] [-p posixrules] [-d directory]"),
 441 _("           [-L leapseconds] [-y yearistype] [filename ... ]"));
 442         (void) exit(EXIT_FAILURE);
 443 }
 444
 445 static const char *     psxrules;
 446 static const char *     lcltime;
 447 static const char *     directory;
 448 static const char *     leapsec;
 449 static const char *     yitcommand;
 450 static int              sflag = FALSE;
 451 static int              Dflag;
 452 static uid_t            uflag = (uid_t)-1;
 453 static gid_t            gflag = (gid_t)-1;
 454 static mode_t           mflag = (S_IRUSR | S_IRGRP | S_IROTH
 455                                  | S_IWUSR);
 456
 457 int
 458 main(argc, argv)
 459 int     argc;
 460 char *  argv[];
 461 {
 462         register int    i;
 463         register int    j;
 464         register int    c;
 465
 466 #ifdef unix
 467         (void) umask(umask(S_IWGRP | S_IWOTH) | (S_IWGRP | S_IWOTH));
 468 #endif /* defined unix */
 469 #if HAVE_GETTEXT - 0
 470         (void) setlocale(LC_MESSAGES, "");
 471 #ifdef TZ_DOMAINDIR
 472         (void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR);
 473 #endif /* defined TEXTDOMAINDIR */
 474         (void) textdomain(TZ_DOMAIN);
 475 #endif /* HAVE_GETTEXT - 0 */
 476         while ((c = getopt(argc, argv, "Dd:g:l:m:p:L:u:vsy:")) != -1)
 477                 switch (c) {
 478                         default:
 479                                 usage();
 480                         case 'D':
 481                                 Dflag = 1;
 482                                 break;
 483                         case 'd':
 484                                 if (directory == NULL)
 485                                         directory = optarg;
 486                                 else
 487                                         errx(EXIT_FAILURE,
 488 _("more than one -d option specified"));
 489                                 break;
 490                         case 'g':
 491                                 setgroup(&gflag, optarg);
 492                                 break;
 493                         case 'l':
 494                                 if (lcltime == NULL)
 495                                         lcltime = optarg;
 496                                 else
 497                                         errx(EXIT_FAILURE,
 498 _("more than one -l option specified"));
 499                                 break;
 500                         case 'm':
 501                         {
 502                                 void *set = setmode(optarg);
 503                                 getmode(set, mflag);
 504                                 break;
 505                         }
 506                         case 'p':
 507                                 if (psxrules == NULL)
 508                                         psxrules = optarg;
 509                                 else
 510                                         errx(EXIT_FAILURE,
 511 _("more than one -p option specified"));
 512                                 break;
 513                         case 'u':
 514                                 setuser(&uflag, optarg);
 515                                 break;
 516                         case 'y':
 517                                 if (yitcommand == NULL)
 518                                         yitcommand = optarg;
 519                                 else
 520                                         errx(EXIT_FAILURE,
 521 _("more than one -y option specified"));
 522                                 break;
 523                         case 'L':
 524                                 if (leapsec == NULL)
 525                                         leapsec = optarg;
 526                                 else
 527                                         errx(EXIT_FAILURE,
 528 _("more than one -L option specified"));
 529                                 break;
 530                         case 'v':
 531                                 noise = TRUE;
 532                                 break;
 533                         case 's':
 534                                 sflag = TRUE;
 535                                 break;
 536                 }
 537         if (optind == argc - 1 && strcmp(argv[optind], "=") == 0)
 538                 usage();        /* usage message by request */
 539         if (directory == NULL)
 540                 directory = TZDIR;
 541         if (yitcommand == NULL)
 542                 yitcommand = "yearistype";
 543
 544         setboundaries();
 545
 546         if (optind < argc && leapsec != NULL) {
 547                 infile(leapsec);
 548                 adjleap();
 549         }
 550
 551         for (i = optind; i < argc; ++i)
 552                 infile(argv[i]);
 553         if (errors)
 554                 (void) exit(EXIT_FAILURE);
 555         associate();
 556         for (i = 0; i < nzones; i = j) {
 557                 /*
 558                 ** Find the next non-continuation zone entry.
 559                 */
 560                 for (j = i + 1; j < nzones && zones[j].z_name == NULL; ++j)
 561                         continue;
 562                 outzone(&zones[i], j - i);
 563         }
 564         /*
 565         ** Make links.
 566         */
 567         for (i = 0; i < nlinks; ++i)
 568                 dolink(links[i].l_from, links[i].l_to);
 569         if (lcltime != NULL)
 570                 dolink(lcltime, TZDEFAULT);
 571         if (psxrules != NULL)
 572                 dolink(psxrules, TZDEFRULES);
 573         return (errors == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
 574 }
 575
 576 static void
 577 dolink(fromfile, tofile)
 578 const char * const      fromfile;
 579 const char * const      tofile;
 580 {
 581         register char * fromname;
 582         register char * toname;
 583
 584         if (fromfile[0] == '/')
 585                 fromname = ecpyalloc(fromfile);
 586         else {
 587                 fromname = ecpyalloc(directory);
 588                 fromname = ecatalloc(fromname, "/");
 589                 fromname = ecatalloc(fromname, fromfile);
 590         }
 591         if (tofile[0] == '/')
 592                 toname = ecpyalloc(tofile);
 593         else {
 594                 toname = ecpyalloc(directory);
 595                 toname = ecatalloc(toname, "/");
 596                 toname = ecatalloc(toname, tofile);
 597         }
 598         /*
 599         ** We get to be careful here since
 600         ** there's a fair chance of root running us.
 601         */
 602         if (!itsdir(toname))
 603                 (void) remove(toname);
 604         if (link(fromname, toname) != 0) {
 605                 int     result;
 606
 607                 if (mkdirs(toname) != 0)
 608                         (void) exit(EXIT_FAILURE);
 609                 result = link(fromname, toname);
 610 #if (HAVE_SYMLINK - 0)
 611                 if (result != 0) {
 612                         result = symlink(fromname, toname);
 613                         if (result == 0)
 614 warning(_("hard link failed, symbolic link used"));
 615                 }
 616 #endif
 617                 if (result != 0) {
 618                         err(EXIT_FAILURE, _("can't link from %s to %s"),
 619                             fromname, toname);
 620                 }
 621         }
 622         ifree(fromname);
 623         ifree(toname);
 624 }
 625
 626 #ifndef INT_MAX
 627 #define INT_MAX ((int) (((unsigned)~0)>>1))
 628 #endif /* !defined INT_MAX */
 629
 630 #ifndef INT_MIN
 631 #define INT_MIN ((int) ~(((unsigned)~0)>>1))
 632 #endif /* !defined INT_MIN */
 633
 634 /*
 635 ** The tz file format currently allows at most 32-bit quantities.
 636 ** This restriction should be removed before signed 32-bit values
 637 ** wrap around in 2038, but unfortunately this will require a
 638 ** change to the tz file format.
 639 */
 640
 641 #define MAX_BITS_IN_FILE        32
 642 #define TIME_T_BITS_IN_FILE     ((TYPE_BIT(time_t) < MAX_BITS_IN_FILE) ? TYPE_BIT(time_t) : MAX_BITS_IN_FILE)
 643
 644 static void
 645 setboundaries P((void))
 646 {
 647         if (TYPE_SIGNED(time_t)) {
 648                 min_time = ~ (time_t) 0;
 649                 min_time <<= TIME_T_BITS_IN_FILE - 1;
 650                 max_time = ~ (time_t) 0 - min_time;
 651                 if (sflag)
 652                         min_time = 0;
 653         } else {
 654                 min_time = 0;
 655                 max_time = 2 - sflag;
 656                 max_time <<= TIME_T_BITS_IN_FILE - 1;
 657                 --max_time;
 658         }
 659         min_year = TM_YEAR_BASE + gmtime(&min_time)->tm_year;
 660         max_year = TM_YEAR_BASE + gmtime(&max_time)->tm_year;
 661         min_year_representable = min_year;
 662         max_year_representable = max_year;
 663 }
 664
 665 static int
 666 itsdir(name)
 667 const char * const      name;
 668 {
 669         register char * myname;
 670         register int    accres;
 671
 672         myname = ecpyalloc(name);
 673         myname = ecatalloc(myname, "/.");
 674         accres = access(myname, F_OK);
 675         ifree(myname);
 676         return accres == 0;
 677 }
 678
 679 /*
 680 ** Associate sets of rules with zones.
 681 */
 682
 683 /*
 684 ** Sort by rule name.
 685 */
 686
 687 static int
 688 rcomp(cp1, cp2)
 689 const void *    cp1;
 690 const void *    cp2;
 691 {
 692         return strcmp(((const struct rule *) cp1)->r_name,
 693                 ((const struct rule *) cp2)->r_name);
 694 }
 695
 696 static void
 697 associate P((void))
 698 {
 699         register struct zone *  zp;
 700         register struct rule *  rp;
 701         register int            base, out;
 702         register int            i, j;
 703
 704         if (nrules != 0) {
 705                 (void) qsort((void *) rules, (size_t) nrules,
 706                         (size_t) sizeof *rules, rcomp);
 707                 for (i = 0; i < nrules - 1; ++i) {
 708                         if (strcmp(rules[i].r_name,
 709                                 rules[i + 1].r_name) != 0)
 710                                         continue;
 711                         if (strcmp(rules[i].r_filename,
 712                                 rules[i + 1].r_filename) == 0)
 713                                         continue;
 714                         eat(rules[i].r_filename, rules[i].r_linenum);
 715                         warning(_("same rule name in multiple files"));
 716                         eat(rules[i + 1].r_filename, rules[i + 1].r_linenum);
 717                         warning(_("same rule name in multiple files"));
 718                         for (j = i + 2; j < nrules; ++j) {
 719                                 if (strcmp(rules[i].r_name,
 720                                         rules[j].r_name) != 0)
 721                                                 break;
 722                                 if (strcmp(rules[i].r_filename,
 723                                         rules[j].r_filename) == 0)
 724                                                 continue;
 725                                 if (strcmp(rules[i + 1].r_filename,
 726                                         rules[j].r_filename) == 0)
 727                                                 continue;
 728                                 break;
 729                         }
 730                         i = j - 1;
 731                 }
 732         }
 733         for (i = 0; i < nzones; ++i) {
 734                 zp = &zones[i];
 735                 zp->z_rules = NULL;
 736                 zp->z_nrules = 0;
 737         }
 738         for (base = 0; base < nrules; base = out) {
 739                 rp = &rules[base];
 740                 for (out = base + 1; out < nrules; ++out)
 741                         if (strcmp(rp->r_name, rules[out].r_name) != 0)
 742                                 break;
 743                 for (i = 0; i < nzones; ++i) {
 744                         zp = &zones[i];
 745                         if (strcmp(zp->z_rule, rp->r_name) != 0)
 746                                 continue;
 747                         zp->z_rules = rp;
 748                         zp->z_nrules = out - base;
 749                 }
 750         }
 751         for (i = 0; i < nzones; ++i) {
 752                 zp = &zones[i];
 753                 if (zp->z_nrules == 0) {
 754                         /*
 755                         ** Maybe we have a local standard time offset.
 756                         */
 757                         eat(zp->z_filename, zp->z_linenum);
 758                         zp->z_stdoff = gethms(zp->z_rule, _("unruly zone"),
 759                                               TRUE);
 760                         /*
 761                         ** Note, though, that if there's no rule,
 762                         ** a '%s' in the format is a bad thing.
 763                         */
 764                         if (strchr(zp->z_format, '%') != 0)
 765                                 error(_("%s in ruleless zone"));
 766                 }
 767         }
 768         if (errors)
 769                 (void) exit(EXIT_FAILURE);
 770 }
 771
 772 static void
 773 infile(name)
 774 const char *    name;
 775 {
 776         register FILE *                 fp;
 777         register char **                fields;
 778         register char *                 cp;
 779         register const struct lookup *  lp;
 780         register int                    nfields;
 781         register int                    wantcont;
 782         register int                    num;
 783         char                            buf[BUFSIZ];
 784
 785         if (strcmp(name, "-") == 0) {
 786                 name = _("standard input");
 787                 fp = stdin;
 788         } else if ((fp = fopen(name, "r")) == NULL)
 789                 err(EXIT_FAILURE, _("can't open %s"), name);
 790         wantcont = FALSE;
 791         for (num = 1; ; ++num) {
 792                 eat(name, num);
 793                 if (fgets(buf, (int) sizeof buf, fp) != buf)
 794                         break;
 795                 cp = strchr(buf, '\n');
 796                 if (cp == NULL) {
 797                         error(_("line too long"));
 798                         (void) exit(EXIT_FAILURE);
 799                 }
 800                 *cp = '\0';
 801                 fields = getfields(buf);
 802                 nfields = 0;
 803                 while (fields[nfields] != NULL) {
 804                         static char     nada;
 805
 806                         if (strcmp(fields[nfields], "-") == 0)
 807                                 fields[nfields] = &nada;
 808                         ++nfields;
 809                 }
 810                 if (nfields == 0) {
 811                         /* nothing to do */
 812                 } else if (wantcont) {
 813                         wantcont = inzcont(fields, nfields);
 814                 } else {
 815                         lp = byword(fields[0], line_codes);
 816                         if (lp == NULL)
 817                                 error(_("input line of unknown type"));
 818                         else switch ((int) (lp->l_value)) {
 819                                 case LC_RULE:
 820                                         inrule(fields, nfields);
 821                                         wantcont = FALSE;
 822                                         break;
 823                                 case LC_ZONE:
 824                                         wantcont = inzone(fields, nfields);
 825                                         break;
 826                                 case LC_LINK:
 827                                         inlink(fields, nfields);
 828                                         wantcont = FALSE;
 829                                         break;
 830                                 case LC_LEAP:
 831                                         if (name != leapsec)
 832                                                 warnx(
 833 _("leap line in non leap seconds file %s"), name);
 834                                         else    inleap(fields, nfields);
 835                                         wantcont = FALSE;
 836                                         break;
 837                                 default:        /* "cannot happen" */
 838                                         errx(EXIT_FAILURE,
 839 _("panic: invalid l_value %d"), lp->l_value);
 840                         }
 841                 }
 842                 ifree((char *) fields);
 843         }
 844         if (ferror(fp))
 845                 errx(EXIT_FAILURE, _("error reading %s"), filename);
 846         if (fp != stdin && fclose(fp))
 847                 err(EXIT_FAILURE, _("error closing %s"), filename);
 848         if (wantcont)
 849                 error(_("expected continuation line not found"));
 850 }
 851
 852 /*
 853 ** Convert a string of one of the forms
 854 **      h       -h      hh:mm   -hh:mm  hh:mm:ss        -hh:mm:ss
 855 ** into a number of seconds.
 856 ** A null string maps to zero.
 857 ** Call error with errstring and return zero on errors.
 858 */
 859
 860 static long
 861 gethms(string, errstring, signable)
 862 const char *            string;
 863 const char * const      errstring;
 864 const int               signable;
 865 {
 866         int     hh, mm, ss, sign;
 867
 868         if (string == NULL || *string == '\0')
 869                 return 0;
 870         if (!signable)
 871                 sign = 1;
 872         else if (*string == '-') {
 873                 sign = -1;
 874                 ++string;
 875         } else  sign = 1;
 876         if (sscanf(string, scheck(string, "%d"), &hh) == 1)
 877                 mm = ss = 0;
 878         else if (sscanf(string, scheck(string, "%d:%d"), &hh, &mm) == 2)
 879                 ss = 0;
 880         else if (sscanf(string, scheck(string, "%d:%d:%d"),
 881                 &hh, &mm, &ss) != 3) {
 882                         error(errstring);
 883                         return 0;
 884         }
 885         if ((hh < 0 || hh >= HOURSPERDAY ||
 886                 mm < 0 || mm >= MINSPERHOUR ||
 887                 ss < 0 || ss > SECSPERMIN) &&
 888                 !(hh == HOURSPERDAY && mm == 0 && ss == 0)) {
 889                         error(errstring);
 890                         return 0;
 891         }
 892         return eitol(sign) *
 893                 (eitol(hh * MINSPERHOUR + mm) *
 894                 eitol(SECSPERMIN) + eitol(ss));
 895 }
 896
 897 static void
 898 inrule(fields, nfields)
 899 register char ** const  fields;
 900 const int               nfields;
 901 {
 902         static struct rule      r;
 903
 904         if (nfields != RULE_FIELDS) {
 905                 error(_("wrong number of fields on Rule line"));
 906                 return;
 907         }
 908         if (*fields[RF_NAME] == '\0') {
 909                 error(_("nameless rule"));
 910                 return;
 911         }
 912         r.r_filename = filename;
 913         r.r_linenum = linenum;
 914         r.r_stdoff = gethms(fields[RF_STDOFF], _("invalid saved time"), TRUE);
 915         rulesub(&r, fields[RF_LOYEAR], fields[RF_HIYEAR], fields[RF_COMMAND],
 916                 fields[RF_MONTH], fields[RF_DAY], fields[RF_TOD]);
 917         r.r_name = ecpyalloc(fields[RF_NAME]);
 918         r.r_abbrvar = ecpyalloc(fields[RF_ABBRVAR]);
 919         rules = (struct rule *) (void *) erealloc((char *) rules,
 920                 (int) ((nrules + 1) * sizeof *rules));
 921         rules[nrules++] = r;
 922 }
 923
 924 static int
 925 inzone(fields, nfields)
 926 register char ** const  fields;
 927 const int               nfields;
 928 {
 929         register int    i;
 930         static char *   buf;
 931
 932         if (nfields < ZONE_MINFIELDS || nfields > ZONE_MAXFIELDS) {
 933                 error(_("wrong number of fields on Zone line"));
 934                 return FALSE;
 935         }
 936         if (strcmp(fields[ZF_NAME], TZDEFAULT) == 0 && lcltime != NULL) {
 937                 buf = erealloc(buf, (int) (132 + strlen(TZDEFAULT)));
 938                 (void) sprintf(buf,
 939 _("\"Zone %s\" line and -l option are mutually exclusive"),
 940                         TZDEFAULT);
 941                 error(buf);
 942                 return FALSE;
 943         }
 944         if (strcmp(fields[ZF_NAME], TZDEFRULES) == 0 && psxrules != NULL) {
 945                 buf = erealloc(buf, (int) (132 + strlen(TZDEFRULES)));
 946                 (void) sprintf(buf,
 947 _("\"Zone %s\" line and -p option are mutually exclusive"),
 948                         TZDEFRULES);
 949                 error(buf);
 950                 return FALSE;
 951         }
 952         for (i = 0; i < nzones; ++i)
 953                 if (zones[i].z_name != NULL &&
 954                         strcmp(zones[i].z_name, fields[ZF_NAME]) == 0) {
 955                                 buf = erealloc(buf, (int) (132 +
 956                                         strlen(fields[ZF_NAME]) +
 957                                         strlen(zones[i].z_filename)));
 958                                 (void) sprintf(buf,
 959 _("duplicate zone name %s (file \"%s\", line %d)"),
 960                                         fields[ZF_NAME],
 961                                         zones[i].z_filename,
 962                                         zones[i].z_linenum);
 963                                 error(buf);
 964                                 return FALSE;
 965                 }
 966         return inzsub(fields, nfields, FALSE);
 967 }
 968
 969 static int
 970 inzcont(fields, nfields)
 971 register char ** const  fields;
 972 const int               nfields;
 973 {
 974         if (nfields < ZONEC_MINFIELDS || nfields > ZONEC_MAXFIELDS) {
 975                 error(_("wrong number of fields on Zone continuation line"));
 976                 return FALSE;
 977         }
 978         return inzsub(fields, nfields, TRUE);
 979 }
 980
 981 static int
 982 inzsub(fields, nfields, iscont)
 983 register char ** const  fields;
 984 const int               nfields;
 985 const int               iscont;
 986 {
 987         register char *         cp;
 988         static struct zone      z;
 989         register int            i_gmtoff, i_rule, i_format;
 990         register int            i_untilyear, i_untilmonth;
 991         register int            i_untilday, i_untiltime;
 992         register int            hasuntil;
 993
 994         if (iscont) {
 995                 i_gmtoff = ZFC_GMTOFF;
 996                 i_rule = ZFC_RULE;
 997                 i_format = ZFC_FORMAT;
 998                 i_untilyear = ZFC_TILYEAR;
 999                 i_untilmonth = ZFC_TILMONTH;
1000                 i_untilday = ZFC_TILDAY;
1001                 i_untiltime = ZFC_TILTIME;
1002                 z.z_name = NULL;
1003         } else {
1004                 i_gmtoff = ZF_GMTOFF;
1005                 i_rule = ZF_RULE;
1006                 i_format = ZF_FORMAT;
1007                 i_untilyear = ZF_TILYEAR;
1008                 i_untilmonth = ZF_TILMONTH;
1009                 i_untilday = ZF_TILDAY;
1010                 i_untiltime = ZF_TILTIME;
1011                 z.z_name = ecpyalloc(fields[ZF_NAME]);
1012         }
1013         z.z_filename = filename;
1014         z.z_linenum = linenum;
1015         z.z_gmtoff = gethms(fields[i_gmtoff], _("invalid UTC offset"), TRUE);
1016         if ((cp = strchr(fields[i_format], '%')) != 0) {
1017                 if (*++cp != 's' || strchr(cp, '%') != 0) {
1018                         error(_("invalid abbreviation format"));
1019                         return FALSE;
1020                 }
1021         }
1022         z.z_rule = ecpyalloc(fields[i_rule]);
1023         z.z_format = ecpyalloc(fields[i_format]);
1024         hasuntil = nfields > i_untilyear;
1025         if (hasuntil) {
1026                 z.z_untilrule.r_filename = filename;
1027                 z.z_untilrule.r_linenum = linenum;
1028                 rulesub(&z.z_untilrule,
1029                         fields[i_untilyear],
1030                         "only",
1031                         "",
1032                         (nfields > i_untilmonth) ?
1033                         fields[i_untilmonth] : "Jan",
1034                         (nfields > i_untilday) ? fields[i_untilday] : "1",
1035                         (nfields > i_untiltime) ? fields[i_untiltime] : "0");
1036                 z.z_untiltime = rpytime(&z.z_untilrule,
1037                         z.z_untilrule.r_loyear);
1038                 if (iscont && nzones > 0 &&
1039                         z.z_untiltime > min_time &&
1040                         z.z_untiltime < max_time &&
1041                         zones[nzones - 1].z_untiltime > min_time &&
1042                         zones[nzones - 1].z_untiltime < max_time &&
1043                         zones[nzones - 1].z_untiltime >= z.z_untiltime) {
1044                                 error(_("Zone continuation line end time is not after end time of previous line"));
1045                                 return FALSE;
1046                 }
1047         }
1048         zones = (struct zone *) (void *) erealloc((char *) zones,
1049                 (int) ((nzones + 1) * sizeof *zones));
1050         zones[nzones++] = z;
1051         /*
1052         ** If there was an UNTIL field on this line,
1053         ** there's more information about the zone on the next line.
1054         */
1055         return hasuntil;
1056 }
1057
1058 static void
1059 inleap(fields, nfields)
1060 register char ** const  fields;
1061 const int               nfields;
1062 {
1063         register const char *           cp;
1064         register const struct lookup *  lp;
1065         register int                    i, j;
1066         int                             year, month, day;
1067         long                            dayoff, tod;
1068         time_t                          t;
1069
1070         if (nfields != LEAP_FIELDS) {
1071                 error(_("wrong number of fields on Leap line"));
1072                 return;
1073         }
1074         dayoff = 0;
1075         cp = fields[LP_YEAR];
1076         if (sscanf(cp, scheck(cp, "%d"), &year) != 1) {
1077                         /*
1078                          * Leapin' Lizards!
1079                          */
1080                         error(_("invalid leaping year"));
1081                         return;
1082         }
1083         j = EPOCH_YEAR;
1084         while (j != year) {
1085                 if (year > j) {
1086                         i = len_years[isleap(j)];
1087                         ++j;
1088                 } else {
1089                         --j;
1090                         i = -len_years[isleap(j)];
1091                 }
1092                 dayoff = oadd(dayoff, eitol(i));
1093         }
1094         if ((lp = byword(fields[LP_MONTH], mon_names)) == NULL) {
1095                 error(_("invalid month name"));
1096                 return;
1097         }
1098         month = lp->l_value;
1099         j = TM_JANUARY;
1100         while (j != month) {
1101                 i = len_months[isleap(year)][j];
1102                 dayoff = oadd(dayoff, eitol(i));
1103                 ++j;
1104         }
1105         cp = fields[LP_DAY];
1106         if (sscanf(cp, scheck(cp, "%d"), &day) != 1 ||
1107                 day <= 0 || day > len_months[isleap(year)][month]) {
1108                         error(_("invalid day of month"));
1109                         return;
1110         }
1111         dayoff = oadd(dayoff, eitol(day - 1));
1112         if (dayoff < 0 && !TYPE_SIGNED(time_t)) {
1113                 error(_("time before zero"));
1114                 return;
1115         }
1116         t = (time_t) dayoff * SECSPERDAY;
1117         /*
1118         ** Cheap overflow check.
1119         */
1120         if (t / SECSPERDAY != dayoff) {
1121                 error(_("time overflow"));
1122                 return;
1123         }
1124         tod = gethms(fields[LP_TIME], _("invalid time of day"), FALSE);
1125         cp = fields[LP_CORR];
1126         {
1127                 register int    positive;
1128                 int             count;
1129
1130                 if (strcmp(cp, "") == 0) { /* infile() turns "-" into "" */
1131                         positive = FALSE;
1132                         count = 1;
1133                 } else if (strcmp(cp, "--") == 0) {
1134                         positive = FALSE;
1135                         count = 2;
1136                 } else if (strcmp(cp, "+") == 0) {
1137                         positive = TRUE;
1138                         count = 1;
1139                 } else if (strcmp(cp, "++") == 0) {
1140                         positive = TRUE;
1141                         count = 2;
1142                 } else {
1143                         error(_("illegal CORRECTION field on Leap line"));
1144                         return;
1145                 }
1146                 if ((lp = byword(fields[LP_ROLL], leap_types)) == NULL) {
1147                         error(_("illegal Rolling/Stationary field on Leap line"));
1148                         return;
1149                 }
1150                 leapadd(tadd(t, tod), positive, lp->l_value, count);
1151         }
1152 }
1153
1154 static void
1155 inlink(fields, nfields)
1156 register char ** const  fields;
1157 const int               nfields;
1158 {
1159         struct link     l;
1160
1161         if (nfields != LINK_FIELDS) {
1162                 error(_("wrong number of fields on Link line"));
1163                 return;
1164         }
1165         if (*fields[LF_FROM] == '\0') {
1166                 error(_("blank FROM field on Link line"));
1167                 return;
1168         }
1169         if (*fields[LF_TO] == '\0') {
1170                 error(_("blank TO field on Link line"));
1171                 return;
1172         }
1173         l.l_filename = filename;
1174         l.l_linenum = linenum;
1175         l.l_from = ecpyalloc(fields[LF_FROM]);
1176         l.l_to = ecpyalloc(fields[LF_TO]);
1177         links = (struct link *) (void *) erealloc((char *) links,
1178                 (int) ((nlinks + 1) * sizeof *links));
1179         links[nlinks++] = l;
1180 }
1181
1182 static void
1183 rulesub(rp, loyearp, hiyearp, typep, monthp, dayp, timep)
1184 register struct rule * const    rp;
1185 const char * const              loyearp;
1186 const char * const              hiyearp;
1187 const char * const              typep;
1188 const char * const              monthp;
1189 const char * const              dayp;
1190 const char * const              timep;
1191 {
1192         register const struct lookup *  lp;
1193         register const char *           cp;
1194         register char *                 dp;
1195         register char *                 ep;
1196
1197         if ((lp = byword(monthp, mon_names)) == NULL) {
1198                 error(_("invalid month name"));
1199                 return;
1200         }
1201         rp->r_month = lp->l_value;
1202         rp->r_todisstd = FALSE;
1203         rp->r_todisgmt = FALSE;
1204         dp = ecpyalloc(timep);
1205         if (*dp != '\0') {
1206                 ep = dp + strlen(dp) - 1;
1207                 switch (lowerit(*ep)) {
1208                         case 's':       /* Standard */
1209                                 rp->r_todisstd = TRUE;
1210                                 rp->r_todisgmt = FALSE;
1211                                 *ep = '\0';
1212                                 break;
1213                         case 'w':       /* Wall */
1214                                 rp->r_todisstd = FALSE;
1215                                 rp->r_todisgmt = FALSE;
1216                                 *ep = '\0';
1217                                 break;
1218                         case 'g':       /* Greenwich */
1219                         case 'u':       /* Universal */
1220                         case 'z':       /* Zulu */
1221                                 rp->r_todisstd = TRUE;
1222                                 rp->r_todisgmt = TRUE;
1223                                 *ep = '\0';
1224                                 break;
1225                 }
1226         }
1227         rp->r_tod = gethms(dp, _("invalid time of day"), FALSE);
1228         ifree(dp);
1229         /*
1230         ** Year work.
1231         */
1232         cp = loyearp;
1233         lp = byword(cp, begin_years);
1234         if (lp != NULL) switch ((int) lp->l_value) {
1235                 case YR_MINIMUM:
1236                         rp->r_loyear = INT_MIN;
1237                         break;
1238                 case YR_MAXIMUM:
1239                         rp->r_loyear = INT_MAX;
1240                         break;
1241                 default:        /* "cannot happen" */
1242                         errx(EXIT_FAILURE,
1243                                 _("panic: invalid l_value %d"), lp->l_value);
1244         } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_loyear) != 1) {
1245                 error(_("invalid starting year"));
1246                 return;
1247         } else if (noise) {
1248                 if (rp->r_loyear < min_year_representable)
1249                         warning(_("starting year too low to be represented"));
1250                 else if (rp->r_loyear > max_year_representable)
1251                         warning(_("starting year too high to be represented"));
1252         }
1253         cp = hiyearp;
1254         if ((lp = byword(cp, end_years)) != NULL) switch ((int) lp->l_value) {
1255                 case YR_MINIMUM:
1256                         rp->r_hiyear = INT_MIN;
1257                         break;
1258                 case YR_MAXIMUM:
1259                         rp->r_hiyear = INT_MAX;
1260                         break;
1261                 case YR_ONLY:
1262                         rp->r_hiyear = rp->r_loyear;
1263                         break;
1264                 default:        /* "cannot happen" */
1265                         errx(EXIT_FAILURE,
1266                                 _("panic: invalid l_value %d"), lp->l_value);
1267         } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_hiyear) != 1) {
1268                 error(_("invalid ending year"));
1269                 return;
1270         } else if (noise) {
1271                 if (rp->r_loyear < min_year_representable)
1272                         warning(_("starting year too low to be represented"));
1273                 else if (rp->r_loyear > max_year_representable)
1274                         warning(_("starting year too high to be represented"));
1275         }
1276         if (rp->r_loyear > rp->r_hiyear) {
1277                 error(_("starting year greater than ending year"));
1278                 return;
1279         }
1280         if (*typep == '\0')
1281                 rp->r_yrtype = NULL;
1282         else {
1283                 if (rp->r_loyear == rp->r_hiyear) {
1284                         error(_("typed single year"));
1285                         return;
1286                 }
1287                 rp->r_yrtype = ecpyalloc(typep);
1288         }
1289         if (rp->r_loyear < min_year && rp->r_loyear > 0)
1290                 min_year = rp->r_loyear;
1291         /*
1292         ** Day work.
1293         ** Accept things such as:
1294         **      1
1295         **      last-Sunday
1296         **      Sun<=20
1297         **      Sun>=7
1298         */
1299         dp = ecpyalloc(dayp);
1300         if ((lp = byword(dp, lasts)) != NULL) {
1301                 rp->r_dycode = DC_DOWLEQ;
1302                 rp->r_wday = lp->l_value;
1303                 rp->r_dayofmonth = len_months[1][rp->r_month];
1304         } else {
1305                 if ((ep = strchr(dp, '<')) != 0)
1306                         rp->r_dycode = DC_DOWLEQ;
1307                 else if ((ep = strchr(dp, '>')) != 0)
1308                         rp->r_dycode = DC_DOWGEQ;
1309                 else {
1310                         ep = dp;
1311                         rp->r_dycode = DC_DOM;
1312                 }
1313                 if (rp->r_dycode != DC_DOM) {
1314                         *ep++ = 0;
1315                         if (*ep++ != '=') {
1316                                 error(_("invalid day of month"));
1317                                 ifree(dp);
1318                                 return;
1319                         }
1320                         if ((lp = byword(dp, wday_names)) == NULL) {
1321                                 error(_("invalid weekday name"));
1322                                 ifree(dp);
1323                                 return;
1324                         }
1325                         rp->r_wday = lp->l_value;
1326                 }
1327                 if (sscanf(ep, scheck(ep, "%d"), &rp->r_dayofmonth) != 1 ||
1328                         rp->r_dayofmonth <= 0 ||
1329                         (rp->r_dayofmonth > len_months[1][rp->r_month])) {
1330                                 error(_("invalid day of month"));
1331                                 ifree(dp);
1332                                 return;
1333                 }
1334         }
1335         ifree(dp);
1336 }
1337
1338 static void
1339 convert(val, buf)
1340 const long      val;
1341 char * const    buf;
1342 {
1343         register int    i;
1344         register long   shift;
1345
1346         for (i = 0, shift = 24; i < 4; ++i, shift -= 8)
1347                 buf[i] = val >> shift;
1348 }
1349
1350 static void
1351 puttzcode(val, fp)
1352 const long      val;
1353 FILE * const    fp;
1354 {
1355         char    buf[4];
1356
1357         convert(val, buf);
1358         (void) fwrite((void *) buf, (size_t) sizeof buf, (size_t) 1, fp);
1359 }
1360
1361 static int
1362 atcomp(avp, bvp)
1363 void *  avp;
1364 void *  bvp;
1365 {
1366         if (((struct attype *) avp)->at < ((struct attype *) bvp)->at)
1367                 return -1;
1368         else if (((struct attype *) avp)->at > ((struct attype *) bvp)->at)
1369                 return 1;
1370         else    return 0;
1371 }
1372
1373 static void
1374 writezone(name)
1375 const char * const      name;
1376 {
1377         register FILE *         fp;
1378         register int            i, j;
1379         static char *           fullname;
1380         static struct tzhead    tzh;
1381         time_t                  ats[TZ_MAX_TIMES];
1382         unsigned char           types[TZ_MAX_TIMES];
1383
1384         /*
1385         ** Sort.
1386         */
1387         if (timecnt > 1)
1388                 (void) qsort((void *) attypes, (size_t) timecnt,
1389                         (size_t) sizeof *attypes, atcomp);
1390         /*
1391         ** Optimize.
1392         */
1393         {
1394                 int     fromi;
1395                 int     toi;
1396
1397                 toi = 0;
1398                 fromi = 0;
1399                 while (fromi < timecnt && attypes[fromi].at < min_time)
1400                         ++fromi;
1401                 if (isdsts[0] == 0)
1402                         while (fromi < timecnt && attypes[fromi].type == 0)
1403                                 ++fromi;        /* handled by default rule */
1404                 for ( ; fromi < timecnt; ++fromi) {
1405                         if (toi != 0
1406                             && ((attypes[fromi].at
1407                                  + gmtoffs[attypes[toi - 1].type])
1408                                 <= (attypes[toi - 1].at
1409                                     + gmtoffs[toi == 1 ? 0
1410                                               : attypes[toi - 2].type]))) {
1411                                 attypes[toi - 1].type = attypes[fromi].type;
1412                                 continue;
1413                         }
1414                         if (toi == 0 ||
1415                                 attypes[toi - 1].type != attypes[fromi].type)
1416                                         attypes[toi++] = attypes[fromi];
1417                 }
1418                 timecnt = toi;
1419         }
1420         /*
1421         ** Transfer.
1422         */
1423         for (i = 0; i < timecnt; ++i) {
1424                 ats[i] = attypes[i].at;
1425                 types[i] = attypes[i].type;
1426         }
1427         fullname = erealloc(fullname,
1428                 (int) (strlen(directory) + 1 + strlen(name) + 1));
1429         (void) sprintf(fullname, "%s/%s", directory, name);
1430
1431         /*
1432          * Remove old file, if any, to snap links.
1433          */
1434         if (!itsdir(fullname) && remove(fullname) != 0 && errno != ENOENT)
1435                 err(EXIT_FAILURE, _("can't remove %s"), fullname);
1436
1437         if ((fp = fopen(fullname, "wb")) == NULL) {
1438                 if (mkdirs(fullname) != 0)
1439                         (void) exit(EXIT_FAILURE);
1440                 if ((fp = fopen(fullname, "wb")) == NULL)
1441                         err(EXIT_FAILURE, _("can't create %s"), fullname);
1442         }
1443         convert(eitol(typecnt), tzh.tzh_ttisgmtcnt);
1444         convert(eitol(typecnt), tzh.tzh_ttisstdcnt);
1445         convert(eitol(leapcnt), tzh.tzh_leapcnt);
1446         convert(eitol(timecnt), tzh.tzh_timecnt);
1447         convert(eitol(typecnt), tzh.tzh_typecnt);
1448         convert(eitol(charcnt), tzh.tzh_charcnt);
1449         (void) strncpy(tzh.tzh_magic, TZ_MAGIC, sizeof tzh.tzh_magic);
1450 #define DO(field)       (void) fwrite((void *) tzh.field, (size_t) sizeof tzh.field, (size_t) 1, fp)
1451         DO(tzh_magic);
1452         DO(tzh_reserved);
1453         DO(tzh_ttisgmtcnt);
1454         DO(tzh_ttisstdcnt);
1455         DO(tzh_leapcnt);
1456         DO(tzh_timecnt);
1457         DO(tzh_typecnt);
1458         DO(tzh_charcnt);
1459 #undef DO
1460         for (i = 0; i < timecnt; ++i) {
1461                 j = leapcnt;
1462                 while (--j >= 0)
1463                         if (ats[i] >= trans[j]) {
1464                                 ats[i] = tadd(ats[i], corr[j]);
1465                                 break;
1466                         }
1467                 puttzcode((long) ats[i], fp);
1468         }
1469         if (timecnt > 0)
1470                 (void) fwrite((void *) types, (size_t) sizeof types[0],
1471                         (size_t) timecnt, fp);
1472         for (i = 0; i < typecnt; ++i) {
1473                 puttzcode((long) gmtoffs[i], fp);
1474                 (void) putc(isdsts[i], fp);
1475                 (void) putc(abbrinds[i], fp);
1476         }
1477         if (charcnt != 0)
1478                 (void) fwrite((void *) chars, (size_t) sizeof chars[0],
1479                         (size_t) charcnt, fp);
1480         for (i = 0; i < leapcnt; ++i) {
1481                 if (roll[i]) {
1482                         if (timecnt == 0 || trans[i] < ats[0]) {
1483                                 j = 0;
1484                                 while (isdsts[j])
1485                                         if (++j >= typecnt) {
1486                                                 j = 0;
1487                                                 break;
1488                                         }
1489                         } else {
1490                                 j = 1;
1491                                 while (j < timecnt && trans[i] >= ats[j])
1492                                         ++j;
1493                                 j = types[j - 1];
1494                         }
1495                         puttzcode((long) tadd(trans[i], -gmtoffs[j]), fp);
1496                 } else  puttzcode((long) trans[i], fp);
1497                 puttzcode((long) corr[i], fp);
1498         }
1499         for (i = 0; i < typecnt; ++i)
1500                 (void) putc(ttisstds[i], fp);
1501         for (i = 0; i < typecnt; ++i)
1502                 (void) putc(ttisgmts[i], fp);
1503         if (ferror(fp) || fclose(fp))
1504                 errx(EXIT_FAILURE, _("error writing %s"), fullname);
1505         if (chmod(fullname, mflag) < 0)
1506                 err(EXIT_FAILURE, _("cannot change mode of %s to %03o"),
1507                     fullname, (unsigned)mflag);
1508         if ((uflag != (uid_t)-1 || gflag != (gid_t)-1)
1509             && chown(fullname, uflag, gflag) < 0)
1510                 err(EXIT_FAILURE, _("cannot change ownership of %s"),
1511                     fullname);
1512 }
1513
1514 static void
1515 doabbr(abbr, format, letters, isdst)
1516 char * const            abbr;
1517 const char * const      format;
1518 const char * const      letters;
1519 const int               isdst;
1520 {
1521         if (strchr(format, '/') == NULL) {
1522                 if (letters == NULL)
1523                         (void) strcpy(abbr, format);
1524                 else    (void) sprintf(abbr, format, letters);
1525         } else if (isdst)
1526                 (void) strcpy(abbr, strchr(format, '/') + 1);
1527         else {
1528                 (void) strcpy(abbr, format);
1529                 *strchr(abbr, '/') = '\0';
1530         }
1531 }
1532
1533 static void
1534 outzone(zpfirst, zonecount)
1535 const struct zone * const       zpfirst;
1536 const int                       zonecount;
1537 {
1538         register const struct zone *    zp;
1539         register struct rule *          rp;
1540         register int                    i, j;
1541         register int                    usestart, useuntil;
1542         register time_t                 starttime, untiltime;
1543         register long                   gmtoff;
1544         register long                   stdoff;
1545         register int                    year;
1546         register long                   startoff;
1547         register int                    startttisstd;
1548         register int                    startttisgmt;
1549         register int                    type;
1550         char                            startbuf[BUFSIZ];
1551
1552         INITIALIZE(untiltime);
1553         INITIALIZE(starttime);
1554         /*
1555         ** Now. . .finally. . .generate some useful data!
1556         */
1557         timecnt = 0;
1558         typecnt = 0;
1559         charcnt = 0;
1560         /*
1561         ** A guess that may well be corrected later.
1562         */
1563         stdoff = 0;
1564         /*
1565         ** Thanks to Earl Chew (earl@dnd.icp.nec.com.au)
1566         ** for noting the need to unconditionally initialize startttisstd.
1567         */
1568         startttisstd = FALSE;
1569         startttisgmt = FALSE;
1570         for (i = 0; i < zonecount; ++i) {
1571                 zp = &zpfirst[i];
1572                 usestart = i > 0 && (zp - 1)->z_untiltime > min_time;
1573                 useuntil = i < (zonecount - 1);
1574                 if (useuntil && zp->z_untiltime <= min_time)
1575                         continue;
1576                 gmtoff = zp->z_gmtoff;
1577                 eat(zp->z_filename, zp->z_linenum);
1578                 *startbuf = '\0';
1579                 startoff = zp->z_gmtoff;
1580                 if (zp->z_nrules == 0) {
1581                         stdoff = zp->z_stdoff;
1582                         doabbr(startbuf, zp->z_format,
1583                                 (char *) NULL, stdoff != 0);
1584                         type = addtype(oadd(zp->z_gmtoff, stdoff),
1585                                 startbuf, stdoff != 0, startttisstd,
1586                                 startttisgmt);
1587                         if (usestart) {
1588                                 addtt(starttime, type);
1589                                 usestart = FALSE;
1590                         }
1591                         else if (stdoff != 0)
1592                                 addtt(min_time, type);
1593                 } else for (year = min_year; year <= max_year; ++year) {
1594                         if (useuntil && year > zp->z_untilrule.r_hiyear)
1595                                 break;
1596                         /*
1597                         ** Mark which rules to do in the current year.
1598                         ** For those to do, calculate rpytime(rp, year);
1599                         */
1600                         for (j = 0; j < zp->z_nrules; ++j) {
1601                                 rp = &zp->z_rules[j];
1602                                 eats(zp->z_filename, zp->z_linenum,
1603                                         rp->r_filename, rp->r_linenum);
1604                                 rp->r_todo = year >= rp->r_loyear &&
1605                                                 year <= rp->r_hiyear &&
1606                                                 yearistype(year, rp->r_yrtype);
1607                                 if (rp->r_todo)
1608                                         rp->r_temp = rpytime(rp, year);
1609                         }
1610                         for ( ; ; ) {
1611                                 register int    k;
1612                                 register time_t jtime, ktime;
1613                                 register long   offset;
1614                                 char            buf[BUFSIZ];
1615
1616                                 INITIALIZE(ktime);
1617                                 if (useuntil) {
1618                                         /*
1619                                         ** Turn untiltime into UTC
1620                                         ** assuming the current gmtoff and
1621                                         ** stdoff values.
1622                                         */
1623                                         untiltime = zp->z_untiltime;
1624                                         if (!zp->z_untilrule.r_todisgmt)
1625                                                 untiltime = tadd(untiltime,
1626                                                         -gmtoff);
1627                                         if (!zp->z_untilrule.r_todisstd)
1628                                                 untiltime = tadd(untiltime,
1629                                                         -stdoff);
1630                                 }
1631                                 /*
1632                                 ** Find the rule (of those to do, if any)
1633                                 ** that takes effect earliest in the year.
1634                                 */
1635                                 k = -1;
1636                                 for (j = 0; j < zp->z_nrules; ++j) {
1637                                         rp = &zp->z_rules[j];
1638                                         if (!rp->r_todo)
1639                                                 continue;
1640                                         eats(zp->z_filename, zp->z_linenum,
1641                                                 rp->r_filename, rp->r_linenum);
1642                                         offset = rp->r_todisgmt ? 0 : gmtoff;
1643                                         if (!rp->r_todisstd)
1644                                                 offset = oadd(offset, stdoff);
1645                                         jtime = rp->r_temp;
1646                                         if (jtime == min_time ||
1647                                                 jtime == max_time)
1648                                                         continue;
1649                                         jtime = tadd(jtime, -offset);
1650                                         if (k < 0 || jtime < ktime) {
1651                                                 k = j;
1652                                                 ktime = jtime;
1653                                         }
1654                                 }
1655                                 if (k < 0)
1656                                         break;  /* go on to next year */
1657                                 rp = &zp->z_rules[k];
1658                                 rp->r_todo = FALSE;
1659                                 if (useuntil && ktime >= untiltime)
1660                                         break;
1661                                 stdoff = rp->r_stdoff;
1662                                 if (usestart && ktime == starttime)
1663                                         usestart = FALSE;
1664                                 if (usestart) {
1665                                         if (ktime < starttime) {
1666                                                 startoff = oadd(zp->z_gmtoff,
1667                                                         stdoff);
1668                                                 doabbr(startbuf, zp->z_format,
1669                                                         rp->r_abbrvar,
1670                                                         rp->r_stdoff != 0);
1671                                                 continue;
1672                                         }
1673                                         if (*startbuf == '\0' &&
1674                                             startoff == oadd(zp->z_gmtoff,
1675                                             stdoff)) {
1676                                                 doabbr(startbuf, zp->z_format,
1677                                                         rp->r_abbrvar,
1678                                                         rp->r_stdoff != 0);
1679                                         }
1680                                 }
1681                                 eats(zp->z_filename, zp->z_linenum,
1682                                         rp->r_filename, rp->r_linenum);
1683                                 doabbr(buf, zp->z_format, rp->r_abbrvar,
1684                                         rp->r_stdoff != 0);
1685                                 offset = oadd(zp->z_gmtoff, rp->r_stdoff);
1686                                 type = addtype(offset, buf, rp->r_stdoff != 0,
1687                                         rp->r_todisstd, rp->r_todisgmt);
1688                                 addtt(ktime, type);
1689                         }
1690                 }
1691                 if (usestart) {
1692                         if (*startbuf == '\0' &&
1693                                 zp->z_format != NULL &&
1694                                 strchr(zp->z_format, '%') == NULL &&
1695                                 strchr(zp->z_format, '/') == NULL)
1696                                         (void) strcpy(startbuf, zp->z_format);
1697                         eat(zp->z_filename, zp->z_linenum);
1698                         if (*startbuf == '\0')
1699 error(_("can't determine time zone abbreviation to use just after until time"));
1700                         else    addtt(starttime,
1701                                         addtype(startoff, startbuf,
1702                                                 startoff != zp->z_gmtoff,
1703                                                 startttisstd,
1704                                                 startttisgmt));
1705                 }
1706                 /*
1707                 ** Now we may get to set starttime for the next zone line.
1708                 */
1709                 if (useuntil) {
1710                         startttisstd = zp->z_untilrule.r_todisstd;
1711                         startttisgmt = zp->z_untilrule.r_todisgmt;
1712                         starttime = zp->z_untiltime;
1713                         if (!startttisstd)
1714                                 starttime = tadd(starttime, -stdoff);
1715                         if (!startttisgmt)
1716                                 starttime = tadd(starttime, -gmtoff);
1717                 }
1718         }
1719         writezone(zpfirst->z_name);
1720 }
1721
1722 static void
1723 addtt(starttime, type)
1724 const time_t    starttime;
1725 int             type;
1726 {
1727         if (starttime <= min_time ||
1728                 (timecnt == 1 && attypes[0].at < min_time)) {
1729                 gmtoffs[0] = gmtoffs[type];
1730                 isdsts[0] = isdsts[type];
1731                 ttisstds[0] = ttisstds[type];
1732                 ttisgmts[0] = ttisgmts[type];
1733                 if (abbrinds[type] != 0)
1734                         (void) strcpy(chars, &chars[abbrinds[type]]);
1735                 abbrinds[0] = 0;
1736                 charcnt = strlen(chars) + 1;
1737                 typecnt = 1;
1738                 timecnt = 0;
1739                 type = 0;
1740         }
1741         if (timecnt >= TZ_MAX_TIMES) {
1742                 error(_("too many transitions?!"));
1743                 (void) exit(EXIT_FAILURE);
1744         }
1745         attypes[timecnt].at = starttime;
1746         attypes[timecnt].type = type;
1747         ++timecnt;
1748 }
1749
1750 static int
1751 addtype(gmtoff, abbr, isdst, ttisstd, ttisgmt)
1752 const long              gmtoff;
1753 const char * const      abbr;
1754 const int               isdst;
1755 const int               ttisstd;
1756 const int               ttisgmt;
1757 {
1758         register int    i, j;
1759
1760         if (isdst != TRUE && isdst != FALSE) {
1761                 error(_("internal error - addtype called with bad isdst"));
1762                 (void) exit(EXIT_FAILURE);
1763         }
1764         if (ttisstd != TRUE && ttisstd != FALSE) {
1765                 error(_("internal error - addtype called with bad ttisstd"));
1766                 (void) exit(EXIT_FAILURE);
1767         }
1768         if (ttisgmt != TRUE && ttisgmt != FALSE) {
1769                 error(_("internal error - addtype called with bad ttisgmt"));
1770                 (void) exit(EXIT_FAILURE);
1771         }
1772         /*
1773         ** See if there's already an entry for this zone type.
1774         ** If so, just return its index.
1775         */
1776         for (i = 0; i < typecnt; ++i) {
1777                 if (gmtoff == gmtoffs[i] && isdst == isdsts[i] &&
1778                         strcmp(abbr, &chars[abbrinds[i]]) == 0 &&
1779                         ttisstd == ttisstds[i] &&
1780                         ttisgmt == ttisgmts[i])
1781                                 return i;
1782         }
1783         /*
1784         ** There isn't one; add a new one, unless there are already too
1785         ** many.
1786         */
1787         if (typecnt >= TZ_MAX_TYPES) {
1788                 error(_("too many local time types"));
1789                 (void) exit(EXIT_FAILURE);
1790         }
1791         gmtoffs[i] = gmtoff;
1792         isdsts[i] = isdst;
1793         ttisstds[i] = ttisstd;
1794         ttisgmts[i] = ttisgmt;
1795
1796         for (j = 0; j < charcnt; ++j)
1797                 if (strcmp(&chars[j], abbr) == 0)
1798                         break;
1799         if (j == charcnt)
1800                 newabbr(abbr);
1801         abbrinds[i] = j;
1802         ++typecnt;
1803         return i;
1804 }
1805
1806 static void
1807 leapadd(t, positive, rolling, count)
1808 const time_t    t;
1809 const int       positive;
1810 const int       rolling;
1811 int             count;
1812 {
1813         register int    i, j;
1814
1815         if (leapcnt + (positive ? count : 1) > TZ_MAX_LEAPS) {
1816                 error(_("too many leap seconds"));
1817                 (void) exit(EXIT_FAILURE);
1818         }
1819         for (i = 0; i < leapcnt; ++i)
1820                 if (t <= trans[i]) {
1821                         if (t == trans[i]) {
1822                                 error(_("repeated leap second moment"));
1823                                 (void) exit(EXIT_FAILURE);
1824                         }
1825                         break;
1826                 }
1827         do {
1828                 for (j = leapcnt; j > i; --j) {
1829                         trans[j] = trans[j - 1];
1830                         corr[j] = corr[j - 1];
1831                         roll[j] = roll[j - 1];
1832                 }
1833                 trans[i] = t;
1834                 corr[i] = positive ? 1L : eitol(-count);
1835                 roll[i] = rolling;
1836                 ++leapcnt;
1837         } while (positive && --count != 0);
1838 }
1839
1840 static void
1841 adjleap P((void))
1842 {
1843         register int    i;
1844         register long   last = 0;
1845
1846         /*
1847         ** propagate leap seconds forward
1848         */
1849         for (i = 0; i < leapcnt; ++i) {
1850                 trans[i] = tadd(trans[i], last);
1851                 last = corr[i] += last;
1852         }
1853 }
1854
1855 static int
1856 yearistype(year, type)
1857 const int               year;
1858 const char * const      type;
1859 {
1860         static char *   buf;
1861         int             result;
1862
1863         if (type == NULL || *type == '\0')
1864                 return TRUE;
1865         buf = erealloc(buf, (int) (132 + strlen(yitcommand) + strlen(type)));
1866         (void) sprintf(buf, "%s %d %s", yitcommand, year, type);
1867         result = system(buf);
1868         if (result == 0)
1869                 return TRUE;
1870         if (result == (1 << 8))
1871                 return FALSE;
1872         error(_("wild result from command execution"));
1873         warnx(_("command was '%s', result was %d"), buf, result);
1874         for ( ; ; )
1875                 (void) exit(EXIT_FAILURE);
1876 }
1877
1878 static int
1879 lowerit(a)
1880 int     a;
1881 {
1882         a = (unsigned char) a;
1883         return (isascii(a) && isupper(a)) ? tolower(a) : a;
1884 }
1885
1886 static int
1887 ciequal(ap, bp)         /* case-insensitive equality */
1888 register const char *   ap;
1889 register const char *   bp;
1890 {
1891         while (lowerit(*ap) == lowerit(*bp++))
1892                 if (*ap++ == '\0')
1893                         return TRUE;
1894         return FALSE;
1895 }
1896
1897 static int
1898 itsabbr(abbr, word)
1899 register const char *   abbr;
1900 register const char *   word;
1901 {
1902         if (lowerit(*abbr) != lowerit(*word))
1903                 return FALSE;
1904         ++word;
1905         while (*++abbr != '\0')
1906                 do {
1907                         if (*word == '\0')
1908                                 return FALSE;
1909                 } while (lowerit(*word++) != lowerit(*abbr));
1910         return TRUE;
1911 }
1912
1913 static const struct lookup *
1914 byword(word, table)
1915 register const char * const             word;
1916 register const struct lookup * const    table;
1917 {
1918         register const struct lookup *  foundlp;
1919         register const struct lookup *  lp;
1920
1921         if (word == NULL || table == NULL)
1922                 return NULL;
1923         /*
1924         ** Look for exact match.
1925         */
1926         for (lp = table; lp->l_word != NULL; ++lp)
1927                 if (ciequal(word, lp->l_word))
1928                         return lp;
1929         /*
1930         ** Look for inexact match.
1931         */
1932         foundlp = NULL;
1933         for (lp = table; lp->l_word != NULL; ++lp)
1934                 if (itsabbr(word, lp->l_word)) {
1935                         if (foundlp == NULL)
1936                                 foundlp = lp;
1937                         else    return NULL;    /* multiple inexact matches */
1938                 }
1939         return foundlp;
1940 }
1941
1942 static char **
1943 getfields(cp)
1944 register char * cp;
1945 {
1946         register char *         dp;
1947         register char **        array;
1948         register int            nsubs;
1949
1950         if (cp == NULL)
1951                 return NULL;
1952         array = (char **) (void *)
1953                 emalloc((int) ((strlen(cp) + 1) * sizeof *array));
1954         nsubs = 0;
1955         for ( ; ; ) {
1956                 while (isascii(*cp) && isspace((unsigned char) *cp))
1957                         ++cp;
1958                 if (*cp == '\0' || *cp == '#')
1959                         break;
1960                 array[nsubs++] = dp = cp;
1961                 do {
1962                         if ((*dp = *cp++) != '"')
1963                                 ++dp;
1964                         else while ((*dp = *cp++) != '"')
1965                                 if (*dp != '\0')
1966                                         ++dp;
1967                                 else    error(_("odd number of quotation marks"));
1968                 } while (*cp != '\0' && *cp != '#' &&
1969                         (!isascii(*cp) || !isspace((unsigned char) *cp)));
1970                 if (isascii(*cp) && isspace((unsigned char) *cp))
1971                         ++cp;
1972                 *dp = '\0';
1973         }
1974         array[nsubs] = NULL;
1975         return array;
1976 }
1977
1978 static long
1979 oadd(t1, t2)
1980 const long      t1;
1981 const long      t2;
1982 {
1983         register long   t;
1984
1985         t = t1 + t2;
1986         if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {
1987                 error(_("time overflow"));
1988                 (void) exit(EXIT_FAILURE);
1989         }
1990         return t;
1991 }
1992
1993 static time_t
1994 tadd(t1, t2)
1995 const time_t    t1;
1996 const long      t2;
1997 {
1998         register time_t t;
1999
2000         if (t1 == max_time && t2 > 0)
2001                 return max_time;
2002         if (t1 == min_time && t2 < 0)
2003                 return min_time;
2004         t = t1 + t2;
2005         if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {
2006                 error(_("time overflow"));
2007                 (void) exit(EXIT_FAILURE);
2008         }
2009         return t;
2010 }
2011
2012 /*
2013 ** Given a rule, and a year, compute the date - in seconds since January 1,
2014 ** 1970, 00:00 LOCAL time - in that year that the rule refers to.
2015 */
2016
2017 static time_t
2018 rpytime(rp, wantedy)
2019 register const struct rule * const      rp;
2020 register const int                      wantedy;
2021 {
2022         register int    y, m, i;
2023         register long   dayoff;                 /* with a nod to Margaret O. */
2024         register time_t t;
2025
2026         if (wantedy == INT_MIN)
2027                 return min_time;
2028         if (wantedy == INT_MAX)
2029                 return max_time;
2030         dayoff = 0;
2031         m = TM_JANUARY;
2032         y = EPOCH_YEAR;
2033         while (wantedy != y) {
2034                 if (wantedy > y) {
2035                         i = len_years[isleap(y)];
2036                         ++y;
2037                 } else {
2038                         --y;
2039                         i = -len_years[isleap(y)];
2040                 }
2041                 dayoff = oadd(dayoff, eitol(i));
2042         }
2043         while (m != rp->r_month) {
2044                 i = len_months[isleap(y)][m];
2045                 dayoff = oadd(dayoff, eitol(i));
2046                 ++m;
2047         }
2048         i = rp->r_dayofmonth;
2049         if (m == TM_FEBRUARY && i == 29 && !isleap(y)) {
2050                 if (rp->r_dycode == DC_DOWLEQ)
2051                         --i;
2052                 else {
2053                         error(_("use of 2/29 in non leap-year"));
2054                         (void) exit(EXIT_FAILURE);
2055                 }
2056         }
2057         --i;
2058         dayoff = oadd(dayoff, eitol(i));
2059         if (rp->r_dycode == DC_DOWGEQ || rp->r_dycode == DC_DOWLEQ) {
2060                 register long   wday;
2061
2062 #define LDAYSPERWEEK    ((long) DAYSPERWEEK)
2063                 wday = eitol(EPOCH_WDAY);
2064                 /*
2065                 ** Don't trust mod of negative numbers.
2066                 */
2067                 if (dayoff >= 0)
2068                         wday = (wday + dayoff) % LDAYSPERWEEK;
2069                 else {
2070                         wday -= ((-dayoff) % LDAYSPERWEEK);
2071                         if (wday < 0)
2072                                 wday += LDAYSPERWEEK;
2073                 }
2074                 while (wday != eitol(rp->r_wday))
2075                         if (rp->r_dycode == DC_DOWGEQ) {
2076                                 dayoff = oadd(dayoff, (long) 1);
2077                                 if (++wday >= LDAYSPERWEEK)
2078                                         wday = 0;
2079                                 ++i;
2080                         } else {
2081                                 dayoff = oadd(dayoff, (long) -1);
2082                                 if (--wday < 0)
2083                                         wday = LDAYSPERWEEK - 1;
2084                                 --i;
2085                         }
2086                 if (i < 0 || i >= len_months[isleap(y)][m]) {
2087                         error(_("no day in month matches rule"));
2088                         (void) exit(EXIT_FAILURE);
2089                 }
2090         }
2091         if (dayoff < 0 && !TYPE_SIGNED(time_t))
2092                 return min_time;
2093         t = (time_t) dayoff * SECSPERDAY;
2094         /*
2095         ** Cheap overflow check.
2096         */
2097         if (t / SECSPERDAY != dayoff)
2098                 return (dayoff > 0) ? max_time : min_time;
2099         return tadd(t, rp->r_tod);
2100 }
2101
2102 static void
2103 newabbr(string)
2104 const char * const      string;
2105 {
2106         register int    i;
2107
2108         i = strlen(string) + 1;
2109         if (charcnt + i > TZ_MAX_CHARS) {
2110                 error(_("too many, or too long, time zone abbreviations"));
2111                 (void) exit(EXIT_FAILURE);
2112         }
2113         (void) strcpy(&chars[charcnt], string);
2114         charcnt += eitol(i);
2115 }
2116
2117 static int
2118 mkdirs(argname)
2119 char * const    argname;
2120 {
2121         register char * name;
2122         register char * cp;
2123
2124         if (argname == NULL || *argname == '\0' || Dflag)
2125                 return 0;
2126         cp = name = ecpyalloc(argname);
2127         while ((cp = strchr(cp + 1, '/')) != 0) {
2128                 *cp = '\0';
2129 #ifndef unix
2130                 /*
2131                 ** DOS drive specifier?
2132                 */
2133                 if (isalpha((unsigned char) name[0]) &&
2134                         name[1] == ':' && name[2] == '\0') {
2135                                 *cp = '/';
2136                                 continue;
2137                 }
2138 #endif /* !defined unix */
2139                 if (!itsdir(name)) {
2140                         /*
2141                         ** It doesn't seem to exist, so we try to create it.
2142                         ** Creation may fail because of the directory being
2143                         ** created by some other multiprocessor, so we get
2144                         ** to do extra checking.
2145                         */
2146                         if (mkdir(name, (S_IRUSR | S_IWUSR | S_IXUSR
2147                                          | S_IRGRP | S_IXGRP | S_IROTH
2148                                          | S_IXOTH)) != 0
2149                                 && (errno != EEXIST || !itsdir(name))) {
2150                                 warn(_("can't create directory %s"), name);
2151                                 ifree(name);
2152                                 return -1;
2153                         }
2154                 }
2155                 *cp = '/';
2156         }
2157         ifree(name);
2158         return 0;
2159 }
2160
2161 static long
2162 eitol(i)
2163 const int       i;
2164 {
2165         long    l;
2166
2167         l = i;
2168         if ((i < 0 && l >= 0) || (i == 0 && l != 0) || (i > 0 && l <= 0))
2169                 errx(EXIT_FAILURE, _("%d did not sign extend correctly"), i);
2170         return l;
2171 }
2172
2173 #include <grp.h>
2174 #include <pwd.h>
2175
2176 static void
2177 setgroup(flag, name)
2178         gid_t *flag;
2179         const char *name;
2180 {
2181         struct group *gr;
2182
2183         if (*flag != (gid_t)-1)
2184                 errx(EXIT_FAILURE, _("multiple -g flags specified"));
2185
2186         gr = getgrnam(name);
2187         if (gr == 0) {
2188                 char *ep;
2189                 unsigned long ul;
2190
2191                 ul = strtoul(name, &ep, 10);
2192                 if (ul == (unsigned long)(gid_t)ul && *ep == '\0') {
2193                         *flag = ul;
2194                         return;
2195                 }
2196                 errx(EXIT_FAILURE, _("group `%s' not found"), name);
2197         }
2198         *flag = gr->gr_gid;
2199 }
2200
2201 static void
2202 setuser(flag, name)
2203         uid_t *flag;
2204         const char *name;
2205 {
2206         struct passwd *pw;
2207
2208         if (*flag != (gid_t)-1)
2209                 errx(EXIT_FAILURE, _("multiple -u flags specified"));
2210
2211         pw = getpwnam(name);
2212         if (pw == 0) {
2213                 char *ep;
2214                 unsigned long ul;
2215
2216                 ul = strtoul(name, &ep, 10);
2217                 if (ul == (unsigned long)(gid_t)ul && *ep == '\0') {
2218                         *flag = ul;
2219                         return;
2220                 }
2221                 errx(EXIT_FAILURE, _("user `%s' not found"), name);
2222         }
2223         *flag = pw->pw_uid;
2224 }
2225
2226 /*
2227 ** UNIX was a registered trademark of UNIX System Laboratories in 1993.
2228 */