timezone/zic.c

   1 #ifndef lint
   2 #ifndef NOID
   3 static char     elsieid[] = "@(#)zic.c  7.99";
   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                 eat(links[i].l_filename, links[i].l_linenum);
 568                 dolink(links[i].l_from, links[i].l_to);
 569         }
 570         if (lcltime != NULL) {
 571                 eat("command line", 1);
 572                 dolink(lcltime, TZDEFAULT);
 573         }
 574         if (psxrules != NULL) {
 575                 eat("command line", 1);
 576                 dolink(psxrules, TZDEFRULES);
 577         }
 578         return (errors == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
 579 }
 580
 581 static void
 582 dolink(fromfile, tofile)
 583 const char * const      fromfile;
 584 const char * const      tofile;
 585 {
 586         register char * fromname;
 587         register char * toname;
 588
 589         if (fromfile[0] == '/')
 590                 fromname = ecpyalloc(fromfile);
 591         else {
 592                 fromname = ecpyalloc(directory);
 593                 fromname = ecatalloc(fromname, "/");
 594                 fromname = ecatalloc(fromname, fromfile);
 595         }
 596         if (tofile[0] == '/')
 597                 toname = ecpyalloc(tofile);
 598         else {
 599                 toname = ecpyalloc(directory);
 600                 toname = ecatalloc(toname, "/");
 601                 toname = ecatalloc(toname, tofile);
 602         }
 603         /*
 604         ** We get to be careful here since
 605         ** there's a fair chance of root running us.
 606         */
 607         if (!itsdir(toname))
 608                 (void) remove(toname);
 609         if (link(fromname, toname) != 0) {
 610                 int     result;
 611
 612                 if (mkdirs(toname) != 0)
 613                         (void) exit(EXIT_FAILURE);
 614
 615                 result = link(fromname, toname);
 616 #if (HAVE_SYMLINK - 0)
 617                 if (result != 0) {
 618                         char *s = (char *) tofile;
 619                         register char * symlinkcontents = NULL;
 620                         while ((s = strchr(s+1, '/')) != NULL)
 621                                 symlinkcontents = ecatalloc(symlinkcontents, "../");
 622                         symlinkcontents = ecatalloc(symlinkcontents, fromfile);
 623
 624                         result = symlink(symlinkcontents, toname);
 625                         if (result == 0)
 626 warning(_("hard link failed, symbolic link used"));
 627                         ifree(symlinkcontents);
 628                 }
 629 #endif
 630                 if (result != 0) {
 631                         const char *e = strerror(errno);
 632
 633                         (void) fprintf(stderr,
 634                                 _("%s: Can't link from %s to %s: %s\n"),
 635                                 progname, fromname, toname, e);
 636                         (void) exit(EXIT_FAILURE);
 637                 }
 638         }
 639         ifree(fromname);
 640         ifree(toname);
 641 }
 642
 643 #ifndef INT_MAX
 644 #define INT_MAX ((int) (((unsigned)~0)>>1))
 645 #endif /* !defined INT_MAX */
 646
 647 #ifndef INT_MIN
 648 #define INT_MIN ((int) ~(((unsigned)~0)>>1))
 649 #endif /* !defined INT_MIN */
 650
 651 /*
 652 ** The tz file format currently allows at most 32-bit quantities.
 653 ** This restriction should be removed before signed 32-bit values
 654 ** wrap around in 2038, but unfortunately this will require a
 655 ** change to the tz file format.
 656 */
 657
 658 #define MAX_BITS_IN_FILE        32
 659 #define TIME_T_BITS_IN_FILE     ((TYPE_BIT(time_t) < MAX_BITS_IN_FILE) ? TYPE_BIT(time_t) : MAX_BITS_IN_FILE)
 660
 661 static void
 662 setboundaries P((void))
 663 {
 664         if (TYPE_SIGNED(time_t)) {
 665                 min_time = ~ (time_t) 0;
 666                 min_time <<= TIME_T_BITS_IN_FILE - 1;
 667                 max_time = ~ (time_t) 0 - min_time;
 668                 if (sflag)
 669                         min_time = 0;
 670         } else {
 671                 min_time = 0;
 672                 max_time = 2 - sflag;
 673                 max_time <<= TIME_T_BITS_IN_FILE - 1;
 674                 --max_time;
 675         }
 676         min_year = TM_YEAR_BASE + gmtime(&min_time)->tm_year;
 677         max_year = TM_YEAR_BASE + gmtime(&max_time)->tm_year;
 678         min_year_representable = min_year;
 679         max_year_representable = max_year;
 680 }
 681
 682 static int
 683 itsdir(name)
 684 const char * const      name;
 685 {
 686         register char * myname;
 687         register int    accres;
 688
 689         myname = ecpyalloc(name);
 690         myname = ecatalloc(myname, "/.");
 691         accres = access(myname, F_OK);
 692         ifree(myname);
 693         return accres == 0;
 694 }
 695
 696 /*
 697 ** Associate sets of rules with zones.
 698 */
 699
 700 /*
 701 ** Sort by rule name.
 702 */
 703
 704 static int
 705 rcomp(cp1, cp2)
 706 const void *    cp1;
 707 const void *    cp2;
 708 {
 709         return strcmp(((const struct rule *) cp1)->r_name,
 710                 ((const struct rule *) cp2)->r_name);
 711 }
 712
 713 static void
 714 associate P((void))
 715 {
 716         register struct zone *  zp;
 717         register struct rule *  rp;
 718         register int            base, out;
 719         register int            i, j;
 720
 721         if (nrules != 0) {
 722                 (void) qsort((void *) rules, (size_t) nrules,
 723                         (size_t) sizeof *rules, rcomp);
 724                 for (i = 0; i < nrules - 1; ++i) {
 725                         if (strcmp(rules[i].r_name,
 726                                 rules[i + 1].r_name) != 0)
 727                                         continue;
 728                         if (strcmp(rules[i].r_filename,
 729                                 rules[i + 1].r_filename) == 0)
 730                                         continue;
 731                         eat(rules[i].r_filename, rules[i].r_linenum);
 732                         warning(_("same rule name in multiple files"));
 733                         eat(rules[i + 1].r_filename, rules[i + 1].r_linenum);
 734                         warning(_("same rule name in multiple files"));
 735                         for (j = i + 2; j < nrules; ++j) {
 736                                 if (strcmp(rules[i].r_name,
 737                                         rules[j].r_name) != 0)
 738                                                 break;
 739                                 if (strcmp(rules[i].r_filename,
 740                                         rules[j].r_filename) == 0)
 741                                                 continue;
 742                                 if (strcmp(rules[i + 1].r_filename,
 743                                         rules[j].r_filename) == 0)
 744                                                 continue;
 745                                 break;
 746                         }
 747                         i = j - 1;
 748                 }
 749         }
 750         for (i = 0; i < nzones; ++i) {
 751                 zp = &zones[i];
 752                 zp->z_rules = NULL;
 753                 zp->z_nrules = 0;
 754         }
 755         for (base = 0; base < nrules; base = out) {
 756                 rp = &rules[base];
 757                 for (out = base + 1; out < nrules; ++out)
 758                         if (strcmp(rp->r_name, rules[out].r_name) != 0)
 759                                 break;
 760                 for (i = 0; i < nzones; ++i) {
 761                         zp = &zones[i];
 762                         if (strcmp(zp->z_rule, rp->r_name) != 0)
 763                                 continue;
 764                         zp->z_rules = rp;
 765                         zp->z_nrules = out - base;
 766                 }
 767         }
 768         for (i = 0; i < nzones; ++i) {
 769                 zp = &zones[i];
 770                 if (zp->z_nrules == 0) {
 771                         /*
 772                         ** Maybe we have a local standard time offset.
 773                         */
 774                         eat(zp->z_filename, zp->z_linenum);
 775                         zp->z_stdoff = gethms(zp->z_rule, _("unruly zone"),
 776                                               TRUE);
 777                         /*
 778                         ** Note, though, that if there's no rule,
 779                         ** a '%s' in the format is a bad thing.
 780                         */
 781                         if (strchr(zp->z_format, '%') != 0)
 782                                 error(_("%s in ruleless zone"));
 783                 }
 784         }
 785         if (errors)
 786                 (void) exit(EXIT_FAILURE);
 787 }
 788
 789 static void
 790 infile(name)
 791 const char *    name;
 792 {
 793         register FILE *                 fp;
 794         register char **                fields;
 795         register char *                 cp;
 796         register const struct lookup *  lp;
 797         register int                    nfields;
 798         register int                    wantcont;
 799         register int                    num;
 800         char                            buf[BUFSIZ];
 801
 802         if (strcmp(name, "-") == 0) {
 803                 name = _("standard input");
 804                 fp = stdin;
 805         } else if ((fp = fopen(name, "r")) == NULL) {
 806                 const char *e = strerror(errno);
 807
 808                 (void) fprintf(stderr, _("%s: Can't open %s: %s\n"),
 809                         progname, name, e);
 810                 (void) exit(EXIT_FAILURE);
 811         }
 812         wantcont = FALSE;
 813         for (num = 1; ; ++num) {
 814                 eat(name, num);
 815                 if (fgets(buf, (int) sizeof buf, fp) != buf)
 816                         break;
 817                 cp = strchr(buf, '\n');
 818                 if (cp == NULL) {
 819                         error(_("line too long"));
 820                         (void) exit(EXIT_FAILURE);
 821                 }
 822                 *cp = '\0';
 823                 fields = getfields(buf);
 824                 nfields = 0;
 825                 while (fields[nfields] != NULL) {
 826                         static char     nada;
 827
 828                         if (strcmp(fields[nfields], "-") == 0)
 829                                 fields[nfields] = &nada;
 830                         ++nfields;
 831                 }
 832                 if (nfields == 0) {
 833                         /* nothing to do */
 834                 } else if (wantcont) {
 835                         wantcont = inzcont(fields, nfields);
 836                 } else {
 837                         lp = byword(fields[0], line_codes);
 838                         if (lp == NULL)
 839                                 error(_("input line of unknown type"));
 840                         else switch ((int) (lp->l_value)) {
 841                                 case LC_RULE:
 842                                         inrule(fields, nfields);
 843                                         wantcont = FALSE;
 844                                         break;
 845                                 case LC_ZONE:
 846                                         wantcont = inzone(fields, nfields);
 847                                         break;
 848                                 case LC_LINK:
 849                                         inlink(fields, nfields);
 850                                         wantcont = FALSE;
 851                                         break;
 852                                 case LC_LEAP:
 853                                         if (name != leapsec)
 854                                                 (void) fprintf(stderr,
 855 _("%s: Leap line in non leap seconds file %s\n"),
 856                                                         progname, name);
 857                                         else    inleap(fields, nfields);
 858                                         wantcont = FALSE;
 859                                         break;
 860                                 default:        /* "cannot happen" */
 861                                         (void) fprintf(stderr,
 862 _("%s: panic: Invalid l_value %d\n"),
 863                                                 progname, lp->l_value);
 864                                         (void) exit(EXIT_FAILURE);
 865                         }
 866                 }
 867                 ifree((char *) fields);
 868         }
 869         if (ferror(fp)) {
 870                 (void) fprintf(stderr, _("%s: Error reading %s\n"),
 871                         progname, filename);
 872                 (void) exit(EXIT_FAILURE);
 873         }
 874         if (fp != stdin && fclose(fp)) {
 875                 const char *e = strerror(errno);
 876
 877                 (void) fprintf(stderr, _("%s: Error closing %s: %s\n"),
 878                         progname, filename, e);
 879                 (void) exit(EXIT_FAILURE);
 880         }
 881         if (wantcont)
 882                 error(_("expected continuation line not found"));
 883 }
 884
 885 /*
 886 ** Convert a string of one of the forms
 887 **      h       -h      hh:mm   -hh:mm  hh:mm:ss        -hh:mm:ss
 888 ** into a number of seconds.
 889 ** A null string maps to zero.
 890 ** Call error with errstring and return zero on errors.
 891 */
 892
 893 static long
 894 gethms(string, errstring, signable)
 895 const char *            string;
 896 const char * const      errstring;
 897 const int               signable;
 898 {
 899         int     hh, mm, ss, sign;
 900
 901         if (string == NULL || *string == '\0')
 902                 return 0;
 903         if (!signable)
 904                 sign = 1;
 905         else if (*string == '-') {
 906                 sign = -1;
 907                 ++string;
 908         } else  sign = 1;
 909         if (sscanf(string, scheck(string, "%d"), &hh) == 1)
 910                 mm = ss = 0;
 911         else if (sscanf(string, scheck(string, "%d:%d"), &hh, &mm) == 2)
 912                 ss = 0;
 913         else if (sscanf(string, scheck(string, "%d:%d:%d"),
 914                 &hh, &mm, &ss) != 3) {
 915                         error(errstring);
 916                         return 0;
 917         }
 918         if ((hh < 0 || hh >= HOURSPERDAY ||
 919                 mm < 0 || mm >= MINSPERHOUR ||
 920                 ss < 0 || ss > SECSPERMIN) &&
 921                 !(hh == HOURSPERDAY && mm == 0 && ss == 0)) {
 922                         error(errstring);
 923                         return 0;
 924         }
 925         return eitol(sign) *
 926                 (eitol(hh * MINSPERHOUR + mm) *
 927                 eitol(SECSPERMIN) + eitol(ss));
 928 }
 929
 930 static void
 931 inrule(fields, nfields)
 932 register char ** const  fields;
 933 const int               nfields;
 934 {
 935         static struct rule      r;
 936
 937         if (nfields != RULE_FIELDS) {
 938                 error(_("wrong number of fields on Rule line"));
 939                 return;
 940         }
 941         if (*fields[RF_NAME] == '\0') {
 942                 error(_("nameless rule"));
 943                 return;
 944         }
 945         r.r_filename = filename;
 946         r.r_linenum = linenum;
 947         r.r_stdoff = gethms(fields[RF_STDOFF], _("invalid saved time"), TRUE);
 948         rulesub(&r, fields[RF_LOYEAR], fields[RF_HIYEAR], fields[RF_COMMAND],
 949                 fields[RF_MONTH], fields[RF_DAY], fields[RF_TOD]);
 950         r.r_name = ecpyalloc(fields[RF_NAME]);
 951         r.r_abbrvar = ecpyalloc(fields[RF_ABBRVAR]);
 952         rules = (struct rule *) (void *) erealloc((char *) rules,
 953                 (int) ((nrules + 1) * sizeof *rules));
 954         rules[nrules++] = r;
 955 }
 956
 957 static int
 958 inzone(fields, nfields)
 959 register char ** const  fields;
 960 const int               nfields;
 961 {
 962         register int    i;
 963         static char *   buf;
 964
 965         if (nfields < ZONE_MINFIELDS || nfields > ZONE_MAXFIELDS) {
 966                 error(_("wrong number of fields on Zone line"));
 967                 return FALSE;
 968         }
 969         if (strcmp(fields[ZF_NAME], TZDEFAULT) == 0 && lcltime != NULL) {
 970                 buf = erealloc(buf, (int) (132 + strlen(TZDEFAULT)));
 971                 (void) sprintf(buf,
 972 _("\"Zone %s\" line and -l option are mutually exclusive"),
 973                         TZDEFAULT);
 974                 error(buf);
 975                 return FALSE;
 976         }
 977         if (strcmp(fields[ZF_NAME], TZDEFRULES) == 0 && psxrules != NULL) {
 978                 buf = erealloc(buf, (int) (132 + strlen(TZDEFRULES)));
 979                 (void) sprintf(buf,
 980 _("\"Zone %s\" line and -p option are mutually exclusive"),
 981                         TZDEFRULES);
 982                 error(buf);
 983                 return FALSE;
 984         }
 985         for (i = 0; i < nzones; ++i)
 986                 if (zones[i].z_name != NULL &&
 987                         strcmp(zones[i].z_name, fields[ZF_NAME]) == 0) {
 988                                 buf = erealloc(buf, (int) (132 +
 989                                         strlen(fields[ZF_NAME]) +
 990                                         strlen(zones[i].z_filename)));
 991                                 (void) sprintf(buf,
 992 _("duplicate zone name %s (file \"%s\", line %d)"),
 993                                         fields[ZF_NAME],
 994                                         zones[i].z_filename,
 995                                         zones[i].z_linenum);
 996                                 error(buf);
 997                                 return FALSE;
 998                 }
 999         return inzsub(fields, nfields, FALSE);
1000 }
1001
1002 static int
1003 inzcont(fields, nfields)
1004 register char ** const  fields;
1005 const int               nfields;
1006 {
1007         if (nfields < ZONEC_MINFIELDS || nfields > ZONEC_MAXFIELDS) {
1008                 error(_("wrong number of fields on Zone continuation line"));
1009                 return FALSE;
1010         }
1011         return inzsub(fields, nfields, TRUE);
1012 }
1013
1014 static int
1015 inzsub(fields, nfields, iscont)
1016 register char ** const  fields;
1017 const int               nfields;
1018 const int               iscont;
1019 {
1020         register char *         cp;
1021         static struct zone      z;
1022         register int            i_gmtoff, i_rule, i_format;
1023         register int            i_untilyear, i_untilmonth;
1024         register int            i_untilday, i_untiltime;
1025         register int            hasuntil;
1026
1027         if (iscont) {
1028                 i_gmtoff = ZFC_GMTOFF;
1029                 i_rule = ZFC_RULE;
1030                 i_format = ZFC_FORMAT;
1031                 i_untilyear = ZFC_TILYEAR;
1032                 i_untilmonth = ZFC_TILMONTH;
1033                 i_untilday = ZFC_TILDAY;
1034                 i_untiltime = ZFC_TILTIME;
1035                 z.z_name = NULL;
1036         } else {
1037                 i_gmtoff = ZF_GMTOFF;
1038                 i_rule = ZF_RULE;
1039                 i_format = ZF_FORMAT;
1040                 i_untilyear = ZF_TILYEAR;
1041                 i_untilmonth = ZF_TILMONTH;
1042                 i_untilday = ZF_TILDAY;
1043                 i_untiltime = ZF_TILTIME;
1044                 z.z_name = ecpyalloc(fields[ZF_NAME]);
1045         }
1046         z.z_filename = filename;
1047         z.z_linenum = linenum;
1048         z.z_gmtoff = gethms(fields[i_gmtoff], _("invalid UTC offset"), TRUE);
1049         if ((cp = strchr(fields[i_format], '%')) != 0) {
1050                 if (*++cp != 's' || strchr(cp, '%') != 0) {
1051                         error(_("invalid abbreviation format"));
1052                         return FALSE;
1053                 }
1054         }
1055         z.z_rule = ecpyalloc(fields[i_rule]);
1056         z.z_format = ecpyalloc(fields[i_format]);
1057         hasuntil = nfields > i_untilyear;
1058         if (hasuntil) {
1059                 z.z_untilrule.r_filename = filename;
1060                 z.z_untilrule.r_linenum = linenum;
1061                 rulesub(&z.z_untilrule,
1062                         fields[i_untilyear],
1063                         "only",
1064                         "",
1065                         (nfields > i_untilmonth) ?
1066                         fields[i_untilmonth] : "Jan",
1067                         (nfields > i_untilday) ? fields[i_untilday] : "1",
1068                         (nfields > i_untiltime) ? fields[i_untiltime] : "0");
1069                 z.z_untiltime = rpytime(&z.z_untilrule,
1070                         z.z_untilrule.r_loyear);
1071                 if (iscont && nzones > 0 &&
1072                         z.z_untiltime > min_time &&
1073                         z.z_untiltime < max_time &&
1074                         zones[nzones - 1].z_untiltime > min_time &&
1075                         zones[nzones - 1].z_untiltime < max_time &&
1076                         zones[nzones - 1].z_untiltime >= z.z_untiltime) {
1077                                 error(_("Zone continuation line end time is not after end time of previous line"));
1078                                 return FALSE;
1079                 }
1080         }
1081         zones = (struct zone *) (void *) erealloc((char *) zones,
1082                 (int) ((nzones + 1) * sizeof *zones));
1083         zones[nzones++] = z;
1084         /*
1085         ** If there was an UNTIL field on this line,
1086         ** there's more information about the zone on the next line.
1087         */
1088         return hasuntil;
1089 }
1090
1091 static void
1092 inleap(fields, nfields)
1093 register char ** const  fields;
1094 const int               nfields;
1095 {
1096         register const char *           cp;
1097         register const struct lookup *  lp;
1098         register int                    i, j;
1099         int                             year, month, day;
1100         long                            dayoff, tod;
1101         time_t                          t;
1102
1103         if (nfields != LEAP_FIELDS) {
1104                 error(_("wrong number of fields on Leap line"));
1105                 return;
1106         }
1107         dayoff = 0;
1108         cp = fields[LP_YEAR];
1109         if (sscanf(cp, scheck(cp, "%d"), &year) != 1) {
1110                         /*
1111                          * Leapin' Lizards!
1112                          */
1113                         error(_("invalid leaping year"));
1114                         return;
1115         }
1116         j = EPOCH_YEAR;
1117         while (j != year) {
1118                 if (year > j) {
1119                         i = len_years[isleap(j)];
1120                         ++j;
1121                 } else {
1122                         --j;
1123                         i = -len_years[isleap(j)];
1124                 }
1125                 dayoff = oadd(dayoff, eitol(i));
1126         }
1127         if ((lp = byword(fields[LP_MONTH], mon_names)) == NULL) {
1128                 error(_("invalid month name"));
1129                 return;
1130         }
1131         month = lp->l_value;
1132         j = TM_JANUARY;
1133         while (j != month) {
1134                 i = len_months[isleap(year)][j];
1135                 dayoff = oadd(dayoff, eitol(i));
1136                 ++j;
1137         }
1138         cp = fields[LP_DAY];
1139         if (sscanf(cp, scheck(cp, "%d"), &day) != 1 ||
1140                 day <= 0 || day > len_months[isleap(year)][month]) {
1141                         error(_("invalid day of month"));
1142                         return;
1143         }
1144         dayoff = oadd(dayoff, eitol(day - 1));
1145         if (dayoff < 0 && !TYPE_SIGNED(time_t)) {
1146                 error(_("time before zero"));
1147                 return;
1148         }
1149         t = (time_t) dayoff * SECSPERDAY;
1150         /*
1151         ** Cheap overflow check.
1152         */
1153         if (t / SECSPERDAY != dayoff) {
1154                 error(_("time overflow"));
1155                 return;
1156         }
1157         tod = gethms(fields[LP_TIME], _("invalid time of day"), FALSE);
1158         cp = fields[LP_CORR];
1159         {
1160                 register int    positive;
1161                 int             count;
1162
1163                 if (strcmp(cp, "") == 0) { /* infile() turns "-" into "" */
1164                         positive = FALSE;
1165                         count = 1;
1166                 } else if (strcmp(cp, "--") == 0) {
1167                         positive = FALSE;
1168                         count = 2;
1169                 } else if (strcmp(cp, "+") == 0) {
1170                         positive = TRUE;
1171                         count = 1;
1172                 } else if (strcmp(cp, "++") == 0) {
1173                         positive = TRUE;
1174                         count = 2;
1175                 } else {
1176                         error(_("illegal CORRECTION field on Leap line"));
1177                         return;
1178                 }
1179                 if ((lp = byword(fields[LP_ROLL], leap_types)) == NULL) {
1180                         error(_("illegal Rolling/Stationary field on Leap line"));
1181                         return;
1182                 }
1183                 leapadd(tadd(t, tod), positive, lp->l_value, count);
1184         }
1185 }
1186
1187 static void
1188 inlink(fields, nfields)
1189 register char ** const  fields;
1190 const int               nfields;
1191 {
1192         struct link     l;
1193
1194         if (nfields != LINK_FIELDS) {
1195                 error(_("wrong number of fields on Link line"));
1196                 return;
1197         }
1198         if (*fields[LF_FROM] == '\0') {
1199                 error(_("blank FROM field on Link line"));
1200                 return;
1201         }
1202         if (*fields[LF_TO] == '\0') {
1203                 error(_("blank TO field on Link line"));
1204                 return;
1205         }
1206         l.l_filename = filename;
1207         l.l_linenum = linenum;
1208         l.l_from = ecpyalloc(fields[LF_FROM]);
1209         l.l_to = ecpyalloc(fields[LF_TO]);
1210         links = (struct link *) (void *) erealloc((char *) links,
1211                 (int) ((nlinks + 1) * sizeof *links));
1212         links[nlinks++] = l;
1213 }
1214
1215 static void
1216 rulesub(rp, loyearp, hiyearp, typep, monthp, dayp, timep)
1217 register struct rule * const    rp;
1218 const char * const              loyearp;
1219 const char * const              hiyearp;
1220 const char * const              typep;
1221 const char * const              monthp;
1222 const char * const              dayp;
1223 const char * const              timep;
1224 {
1225         register const struct lookup *  lp;
1226         register const char *           cp;
1227         register char *                 dp;
1228         register char *                 ep;
1229
1230         if ((lp = byword(monthp, mon_names)) == NULL) {
1231                 error(_("invalid month name"));
1232                 return;
1233         }
1234         rp->r_month = lp->l_value;
1235         rp->r_todisstd = FALSE;
1236         rp->r_todisgmt = FALSE;
1237         dp = ecpyalloc(timep);
1238         if (*dp != '\0') {
1239                 ep = dp + strlen(dp) - 1;
1240                 switch (lowerit(*ep)) {
1241                         case 's':       /* Standard */
1242                                 rp->r_todisstd = TRUE;
1243                                 rp->r_todisgmt = FALSE;
1244                                 *ep = '\0';
1245                                 break;
1246                         case 'w':       /* Wall */
1247                                 rp->r_todisstd = FALSE;
1248                                 rp->r_todisgmt = FALSE;
1249                                 *ep = '\0';
1250                                 break;
1251                         case 'g':       /* Greenwich */
1252                         case 'u':       /* Universal */
1253                         case 'z':       /* Zulu */
1254                                 rp->r_todisstd = TRUE;
1255                                 rp->r_todisgmt = TRUE;
1256                                 *ep = '\0';
1257                                 break;
1258                 }
1259         }
1260         rp->r_tod = gethms(dp, _("invalid time of day"), FALSE);
1261         ifree(dp);
1262         /*
1263         ** Year work.
1264         */
1265         cp = loyearp;
1266         lp = byword(cp, begin_years);
1267         if (lp != NULL) switch ((int) lp->l_value) {
1268                 case YR_MINIMUM:
1269                         rp->r_loyear = INT_MIN;
1270                         break;
1271                 case YR_MAXIMUM:
1272                         rp->r_loyear = INT_MAX;
1273                         break;
1274                 default:        /* "cannot happen" */
1275                         (void) fprintf(stderr,
1276                                 _("%s: panic: Invalid l_value %d\n"),
1277                                 progname, lp->l_value);
1278                         (void) exit(EXIT_FAILURE);
1279         } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_loyear) != 1) {
1280                 error(_("invalid starting year"));
1281                 return;
1282         } else if (noise) {
1283                 if (rp->r_loyear < min_year_representable)
1284                         warning(_("starting year too low to be represented"));
1285                 else if (rp->r_loyear > max_year_representable)
1286                         warning(_("starting year too high to be represented"));
1287         }
1288         cp = hiyearp;
1289         if ((lp = byword(cp, end_years)) != NULL) switch ((int) lp->l_value) {
1290                 case YR_MINIMUM:
1291                         rp->r_hiyear = INT_MIN;
1292                         break;
1293                 case YR_MAXIMUM:
1294                         rp->r_hiyear = INT_MAX;
1295                         break;
1296                 case YR_ONLY:
1297                         rp->r_hiyear = rp->r_loyear;
1298                         break;
1299                 default:        /* "cannot happen" */
1300                         (void) fprintf(stderr,
1301                                 _("%s: panic: Invalid l_value %d\n"),
1302                                 progname, lp->l_value);
1303                         (void) exit(EXIT_FAILURE);
1304         } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_hiyear) != 1) {
1305                 error(_("invalid ending year"));
1306                 return;
1307         } else if (noise) {
1308                 if (rp->r_loyear < min_year_representable)
1309                         warning(_("starting year too low to be represented"));
1310                 else if (rp->r_loyear > max_year_representable)
1311                         warning(_("starting year too high to be represented"));
1312         }
1313         if (rp->r_loyear > rp->r_hiyear) {
1314                 error(_("starting year greater than ending year"));
1315                 return;
1316         }
1317         if (*typep == '\0')
1318                 rp->r_yrtype = NULL;
1319         else {
1320                 if (rp->r_loyear == rp->r_hiyear) {
1321                         error(_("typed single year"));
1322                         return;
1323                 }
1324                 rp->r_yrtype = ecpyalloc(typep);
1325         }
1326         if (rp->r_loyear < min_year && rp->r_loyear > 0)
1327                 min_year = rp->r_loyear;
1328         /*
1329         ** Day work.
1330         ** Accept things such as:
1331         **      1
1332         **      last-Sunday
1333         **      Sun<=20
1334         **      Sun>=7
1335         */
1336         dp = ecpyalloc(dayp);
1337         if ((lp = byword(dp, lasts)) != NULL) {
1338                 rp->r_dycode = DC_DOWLEQ;
1339                 rp->r_wday = lp->l_value;
1340                 rp->r_dayofmonth = len_months[1][rp->r_month];
1341         } else {
1342                 if ((ep = strchr(dp, '<')) != 0)
1343                         rp->r_dycode = DC_DOWLEQ;
1344                 else if ((ep = strchr(dp, '>')) != 0)
1345                         rp->r_dycode = DC_DOWGEQ;
1346                 else {
1347                         ep = dp;
1348                         rp->r_dycode = DC_DOM;
1349                 }
1350                 if (rp->r_dycode != DC_DOM) {
1351                         *ep++ = 0;
1352                         if (*ep++ != '=') {
1353                                 error(_("invalid day of month"));
1354                                 ifree(dp);
1355                                 return;
1356                         }
1357                         if ((lp = byword(dp, wday_names)) == NULL) {
1358                                 error(_("invalid weekday name"));
1359                                 ifree(dp);
1360                                 return;
1361                         }
1362                         rp->r_wday = lp->l_value;
1363                 }
1364                 if (sscanf(ep, scheck(ep, "%d"), &rp->r_dayofmonth) != 1 ||
1365                         rp->r_dayofmonth <= 0 ||
1366                         (rp->r_dayofmonth > len_months[1][rp->r_month])) {
1367                                 error(_("invalid day of month"));
1368                                 ifree(dp);
1369                                 return;
1370                 }
1371         }
1372         ifree(dp);
1373 }
1374
1375 static void
1376 convert(val, buf)
1377 const long      val;
1378 char * const    buf;
1379 {
1380         register int    i;
1381         register long   shift;
1382
1383         for (i = 0, shift = 24; i < 4; ++i, shift -= 8)
1384                 buf[i] = val >> shift;
1385 }
1386
1387 static void
1388 puttzcode(val, fp)
1389 const long      val;
1390 FILE * const    fp;
1391 {
1392         char    buf[4];
1393
1394         convert(val, buf);
1395         (void) fwrite((void *) buf, (size_t) sizeof buf, (size_t) 1, fp);
1396 }
1397
1398 static int
1399 atcomp(avp, bvp)
1400 void *  avp;
1401 void *  bvp;
1402 {
1403         if (((struct attype *) avp)->at < ((struct attype *) bvp)->at)
1404                 return -1;
1405         else if (((struct attype *) avp)->at > ((struct attype *) bvp)->at)
1406                 return 1;
1407         else    return 0;
1408 }
1409
1410 static void
1411 writezone(name)
1412 const char * const      name;
1413 {
1414         register FILE *         fp;
1415         register int            i, j;
1416         static char *           fullname;
1417         static struct tzhead    tzh;
1418         time_t                  ats[TZ_MAX_TIMES];
1419         unsigned char           types[TZ_MAX_TIMES];
1420
1421         /*
1422         ** Sort.
1423         */
1424         if (timecnt > 1)
1425                 (void) qsort((void *) attypes, (size_t) timecnt,
1426                         (size_t) sizeof *attypes, atcomp);
1427         /*
1428         ** Optimize.
1429         */
1430         {
1431                 int     fromi;
1432                 int     toi;
1433
1434                 toi = 0;
1435                 fromi = 0;
1436                 while (fromi < timecnt && attypes[fromi].at < min_time)
1437                         ++fromi;
1438                 if (isdsts[0] == 0)
1439                         while (fromi < timecnt && attypes[fromi].type == 0)
1440                                 ++fromi;        /* handled by default rule */
1441                 for ( ; fromi < timecnt; ++fromi) {
1442                         if (toi != 0
1443                             && ((attypes[fromi].at
1444                                  + gmtoffs[attypes[toi - 1].type])
1445                                 <= (attypes[toi - 1].at
1446                                     + gmtoffs[toi == 1 ? 0
1447                                               : attypes[toi - 2].type]))) {
1448                                 attypes[toi - 1].type = attypes[fromi].type;
1449                                 continue;
1450                         }
1451                         if (toi == 0 ||
1452                                 attypes[toi - 1].type != attypes[fromi].type)
1453                                         attypes[toi++] = attypes[fromi];
1454                 }
1455                 timecnt = toi;
1456         }
1457         /*
1458         ** Transfer.
1459         */
1460         for (i = 0; i < timecnt; ++i) {
1461                 ats[i] = attypes[i].at;
1462                 types[i] = attypes[i].type;
1463         }
1464         fullname = erealloc(fullname,
1465                 (int) (strlen(directory) + 1 + strlen(name) + 1));
1466         (void) sprintf(fullname, "%s/%s", directory, name);
1467         /*
1468         ** Remove old file, if any, to snap links.
1469         */
1470         if (!itsdir(fullname) && remove(fullname) != 0 && errno != ENOENT) {
1471                 const char *e = strerror(errno);
1472
1473                 (void) fprintf(stderr, _("%s: Can't remove %s: %s\n"),
1474                         progname, fullname, e);
1475                 (void) exit(EXIT_FAILURE);
1476         }
1477         if ((fp = fopen(fullname, "wb")) == NULL) {
1478                 if (mkdirs(fullname) != 0)
1479                         (void) exit(EXIT_FAILURE);
1480                 if ((fp = fopen(fullname, "wb")) == NULL) {
1481                         const char *e = strerror(errno);
1482
1483                         (void) fprintf(stderr, _("%s: Can't create %s: %s\n"),
1484                                 progname, fullname, e);
1485                         (void) exit(EXIT_FAILURE);
1486                 }
1487         }
1488         convert(eitol(typecnt), tzh.tzh_ttisgmtcnt);
1489         convert(eitol(typecnt), tzh.tzh_ttisstdcnt);
1490         convert(eitol(leapcnt), tzh.tzh_leapcnt);
1491         convert(eitol(timecnt), tzh.tzh_timecnt);
1492         convert(eitol(typecnt), tzh.tzh_typecnt);
1493         convert(eitol(charcnt), tzh.tzh_charcnt);
1494         (void) strncpy(tzh.tzh_magic, TZ_MAGIC, sizeof tzh.tzh_magic);
1495 #define DO(field)       (void) fwrite((void *) tzh.field, (size_t) sizeof tzh.field, (size_t) 1, fp)
1496         DO(tzh_magic);
1497         DO(tzh_reserved);
1498         DO(tzh_ttisgmtcnt);
1499         DO(tzh_ttisstdcnt);
1500         DO(tzh_leapcnt);
1501         DO(tzh_timecnt);
1502         DO(tzh_typecnt);
1503         DO(tzh_charcnt);
1504 #undef DO
1505         for (i = 0; i < timecnt; ++i) {
1506                 j = leapcnt;
1507                 while (--j >= 0)
1508                         if (ats[i] >= trans[j]) {
1509                                 ats[i] = tadd(ats[i], corr[j]);
1510                                 break;
1511                         }
1512                 puttzcode((long) ats[i], fp);
1513         }
1514         if (timecnt > 0)
1515                 (void) fwrite((void *) types, (size_t) sizeof types[0],
1516                         (size_t) timecnt, fp);
1517         for (i = 0; i < typecnt; ++i) {
1518                 puttzcode((long) gmtoffs[i], fp);
1519                 (void) putc(isdsts[i], fp);
1520                 (void) putc(abbrinds[i], fp);
1521         }
1522         if (charcnt != 0)
1523                 (void) fwrite((void *) chars, (size_t) sizeof chars[0],
1524                         (size_t) charcnt, fp);
1525         for (i = 0; i < leapcnt; ++i) {
1526                 if (roll[i]) {
1527                         if (timecnt == 0 || trans[i] < ats[0]) {
1528                                 j = 0;
1529                                 while (isdsts[j])
1530                                         if (++j >= typecnt) {
1531                                                 j = 0;
1532                                                 break;
1533                                         }
1534                         } else {
1535                                 j = 1;
1536                                 while (j < timecnt && trans[i] >= ats[j])
1537                                         ++j;
1538                                 j = types[j - 1];
1539                         }
1540                         puttzcode((long) tadd(trans[i], -gmtoffs[j]), fp);
1541                 } else  puttzcode((long) trans[i], fp);
1542                 puttzcode((long) corr[i], fp);
1543         }
1544         for (i = 0; i < typecnt; ++i)
1545                 (void) putc(ttisstds[i], fp);
1546         for (i = 0; i < typecnt; ++i)
1547                 (void) putc(ttisgmts[i], fp);
1548         if (ferror(fp) || fclose(fp)) {
1549                 (void) fprintf(stderr, _("%s: Error writing %s\n"),
1550                         progname, fullname);
1551                 (void) exit(EXIT_FAILURE);
1552         }
1553 }
1554
1555 static void
1556 doabbr(abbr, format, letters, isdst)
1557 char * const            abbr;
1558 const char * const      format;
1559 const char * const      letters;
1560 const int               isdst;
1561 {
1562         if (strchr(format, '/') == NULL) {
1563                 if (letters == NULL)
1564                         (void) strcpy(abbr, format);
1565                 else    (void) sprintf(abbr, format, letters);
1566         } else if (isdst)
1567                 (void) strcpy(abbr, strchr(format, '/') + 1);
1568         else {
1569                 (void) strcpy(abbr, format);
1570                 *strchr(abbr, '/') = '\0';
1571         }
1572 }
1573
1574 static void
1575 outzone(zpfirst, zonecount)
1576 const struct zone * const       zpfirst;
1577 const int                       zonecount;
1578 {
1579         register const struct zone *    zp;
1580         register struct rule *          rp;
1581         register int                    i, j;
1582         register int                    usestart, useuntil;
1583         register time_t                 starttime, untiltime;
1584         register long                   gmtoff;
1585         register long                   stdoff;
1586         register int                    year;
1587         register long                   startoff;
1588         register int                    startttisstd;
1589         register int                    startttisgmt;
1590         register int                    type;
1591         char                            startbuf[BUFSIZ];
1592
1593         INITIALIZE(untiltime);
1594         INITIALIZE(starttime);
1595         /*
1596         ** Now. . .finally. . .generate some useful data!
1597         */
1598         timecnt = 0;
1599         typecnt = 0;
1600         charcnt = 0;
1601         /*
1602         ** A guess that may well be corrected later.
1603         */
1604         stdoff = 0;
1605         /*
1606         ** Thanks to Earl Chew (earl@dnd.icp.nec.com.au)
1607         ** for noting the need to unconditionally initialize startttisstd.
1608         */
1609         startttisstd = FALSE;
1610         startttisgmt = FALSE;
1611         for (i = 0; i < zonecount; ++i) {
1612                 zp = &zpfirst[i];
1613                 usestart = i > 0 && (zp - 1)->z_untiltime > min_time;
1614                 useuntil = i < (zonecount - 1);
1615                 if (useuntil && zp->z_untiltime <= min_time)
1616                         continue;
1617                 gmtoff = zp->z_gmtoff;
1618                 eat(zp->z_filename, zp->z_linenum);
1619                 *startbuf = '\0';
1620                 startoff = zp->z_gmtoff;
1621                 if (zp->z_nrules == 0) {
1622                         stdoff = zp->z_stdoff;
1623                         doabbr(startbuf, zp->z_format,
1624                                 (char *) NULL, stdoff != 0);
1625                         type = addtype(oadd(zp->z_gmtoff, stdoff),
1626                                 startbuf, stdoff != 0, startttisstd,
1627                                 startttisgmt);
1628                         if (usestart) {
1629                                 addtt(starttime, type);
1630                                 usestart = FALSE;
1631                         }
1632                         else if (stdoff != 0)
1633                                 addtt(min_time, type);
1634                 } else for (year = min_year; year <= max_year; ++year) {
1635                         if (useuntil && year > zp->z_untilrule.r_hiyear)
1636                                 break;
1637                         /*
1638                         ** Mark which rules to do in the current year.
1639                         ** For those to do, calculate rpytime(rp, year);
1640                         */
1641                         for (j = 0; j < zp->z_nrules; ++j) {
1642                                 rp = &zp->z_rules[j];
1643                                 eats(zp->z_filename, zp->z_linenum,
1644                                         rp->r_filename, rp->r_linenum);
1645                                 rp->r_todo = year >= rp->r_loyear &&
1646                                                 year <= rp->r_hiyear &&
1647                                                 yearistype(year, rp->r_yrtype);
1648                                 if (rp->r_todo)
1649                                         rp->r_temp = rpytime(rp, year);
1650                         }
1651                         for ( ; ; ) {
1652                                 register int    k;
1653                                 register time_t jtime, ktime;
1654                                 register long   offset;
1655                                 char            buf[BUFSIZ];
1656
1657                                 INITIALIZE(ktime);
1658                                 if (useuntil) {
1659                                         /*
1660                                         ** Turn untiltime into UTC
1661                                         ** assuming the current gmtoff and
1662                                         ** stdoff values.
1663                                         */
1664                                         untiltime = zp->z_untiltime;
1665                                         if (!zp->z_untilrule.r_todisgmt)
1666                                                 untiltime = tadd(untiltime,
1667                                                         -gmtoff);
1668                                         if (!zp->z_untilrule.r_todisstd)
1669                                                 untiltime = tadd(untiltime,
1670                                                         -stdoff);
1671                                 }
1672                                 /*
1673                                 ** Find the rule (of those to do, if any)
1674                                 ** that takes effect earliest in the year.
1675                                 */
1676                                 k = -1;
1677                                 for (j = 0; j < zp->z_nrules; ++j) {
1678                                         rp = &zp->z_rules[j];
1679                                         if (!rp->r_todo)
1680                                                 continue;
1681                                         eats(zp->z_filename, zp->z_linenum,
1682                                                 rp->r_filename, rp->r_linenum);
1683                                         offset = rp->r_todisgmt ? 0 : gmtoff;
1684                                         if (!rp->r_todisstd)
1685                                                 offset = oadd(offset, stdoff);
1686                                         jtime = rp->r_temp;
1687                                         if (jtime == min_time ||
1688                                                 jtime == max_time)
1689                                                         continue;
1690                                         jtime = tadd(jtime, -offset);
1691                                         if (k < 0 || jtime < ktime) {
1692                                                 k = j;
1693                                                 ktime = jtime;
1694                                         }
1695                                 }
1696                                 if (k < 0)
1697                                         break;  /* go on to next year */
1698                                 rp = &zp->z_rules[k];
1699                                 rp->r_todo = FALSE;
1700                                 if (useuntil && ktime >= untiltime)
1701                                         break;
1702                                 stdoff = rp->r_stdoff;
1703                                 if (usestart && ktime == starttime)
1704                                         usestart = FALSE;
1705                                 if (usestart) {
1706                                         if (ktime < starttime) {
1707                                                 startoff = oadd(zp->z_gmtoff,
1708                                                         stdoff);
1709                                                 doabbr(startbuf, zp->z_format,
1710                                                         rp->r_abbrvar,
1711                                                         rp->r_stdoff != 0);
1712                                                 continue;
1713                                         }
1714                                         if (*startbuf == '\0' &&
1715                                             startoff == oadd(zp->z_gmtoff,
1716                                             stdoff)) {
1717                                                 doabbr(startbuf, zp->z_format,
1718                                                         rp->r_abbrvar,
1719                                                         rp->r_stdoff != 0);
1720                                         }
1721                                 }
1722                                 eats(zp->z_filename, zp->z_linenum,
1723                                         rp->r_filename, rp->r_linenum);
1724                                 doabbr(buf, zp->z_format, rp->r_abbrvar,
1725                                         rp->r_stdoff != 0);
1726                                 offset = oadd(zp->z_gmtoff, rp->r_stdoff);
1727                                 type = addtype(offset, buf, rp->r_stdoff != 0,
1728                                         rp->r_todisstd, rp->r_todisgmt);
1729                                 addtt(ktime, type);
1730                         }
1731                 }
1732                 if (usestart) {
1733                         if (*startbuf == '\0' &&
1734                                 zp->z_format != NULL &&
1735                                 strchr(zp->z_format, '%') == NULL &&
1736                                 strchr(zp->z_format, '/') == NULL)
1737                                         (void) strcpy(startbuf, zp->z_format);
1738                         eat(zp->z_filename, zp->z_linenum);
1739                         if (*startbuf == '\0')
1740 error(_("can't determine time zone abbreviation to use just after until time"));
1741                         else    addtt(starttime,
1742                                         addtype(startoff, startbuf,
1743                                                 startoff != zp->z_gmtoff,
1744                                                 startttisstd,
1745                                                 startttisgmt));
1746                 }
1747                 /*
1748                 ** Now we may get to set starttime for the next zone line.
1749                 */
1750                 if (useuntil) {
1751                         startttisstd = zp->z_untilrule.r_todisstd;
1752                         startttisgmt = zp->z_untilrule.r_todisgmt;
1753                         starttime = zp->z_untiltime;
1754                         if (!startttisstd)
1755                                 starttime = tadd(starttime, -stdoff);
1756                         if (!startttisgmt)
1757                                 starttime = tadd(starttime, -gmtoff);
1758                 }
1759         }
1760         writezone(zpfirst->z_name);
1761 }
1762
1763 static void
1764 addtt(starttime, type)
1765 const time_t    starttime;
1766 int             type;
1767 {
1768         if (starttime <= min_time ||
1769                 (timecnt == 1 && attypes[0].at < min_time)) {
1770                 gmtoffs[0] = gmtoffs[type];
1771                 isdsts[0] = isdsts[type];
1772                 ttisstds[0] = ttisstds[type];
1773                 ttisgmts[0] = ttisgmts[type];
1774                 if (abbrinds[type] != 0)
1775                         (void) strcpy(chars, &chars[abbrinds[type]]);
1776                 abbrinds[0] = 0;
1777                 charcnt = strlen(chars) + 1;
1778                 typecnt = 1;
1779                 timecnt = 0;
1780                 type = 0;
1781         }
1782         if (timecnt >= TZ_MAX_TIMES) {
1783                 error(_("too many transitions?!"));
1784                 (void) exit(EXIT_FAILURE);
1785         }
1786         attypes[timecnt].at = starttime;
1787         attypes[timecnt].type = type;
1788         ++timecnt;
1789 }
1790
1791 static int
1792 addtype(gmtoff, abbr, isdst, ttisstd, ttisgmt)
1793 const long              gmtoff;
1794 const char * const      abbr;
1795 const int               isdst;
1796 const int               ttisstd;
1797 const int               ttisgmt;
1798 {
1799         register int    i, j;
1800
1801         if (isdst != TRUE && isdst != FALSE) {
1802                 error(_("internal error - addtype called with bad isdst"));
1803                 (void) exit(EXIT_FAILURE);
1804         }
1805         if (ttisstd != TRUE && ttisstd != FALSE) {
1806                 error(_("internal error - addtype called with bad ttisstd"));
1807                 (void) exit(EXIT_FAILURE);
1808         }
1809         if (ttisgmt != TRUE && ttisgmt != FALSE) {
1810                 error(_("internal error - addtype called with bad ttisgmt"));
1811                 (void) exit(EXIT_FAILURE);
1812         }
1813         /*
1814         ** See if there's already an entry for this zone type.
1815         ** If so, just return its index.
1816         */
1817         for (i = 0; i < typecnt; ++i) {
1818                 if (gmtoff == gmtoffs[i] && isdst == isdsts[i] &&
1819                         strcmp(abbr, &chars[abbrinds[i]]) == 0 &&
1820                         ttisstd == ttisstds[i] &&
1821                         ttisgmt == ttisgmts[i])
1822                                 return i;
1823         }
1824         /*
1825         ** There isn't one; add a new one, unless there are already too
1826         ** many.
1827         */
1828         if (typecnt >= TZ_MAX_TYPES) {
1829                 error(_("too many local time types"));
1830                 (void) exit(EXIT_FAILURE);
1831         }
1832         gmtoffs[i] = gmtoff;
1833         isdsts[i] = isdst;
1834         ttisstds[i] = ttisstd;
1835         ttisgmts[i] = ttisgmt;
1836
1837         for (j = 0; j < charcnt; ++j)
1838                 if (strcmp(&chars[j], abbr) == 0)
1839                         break;
1840         if (j == charcnt)
1841                 newabbr(abbr);
1842         abbrinds[i] = j;
1843         ++typecnt;
1844         return i;
1845 }
1846
1847 static void
1848 leapadd(t, positive, rolling, count)
1849 const time_t    t;
1850 const int       positive;
1851 const int       rolling;
1852 int             count;
1853 {
1854         register int    i, j;
1855
1856         if (leapcnt + (positive ? count : 1) > TZ_MAX_LEAPS) {
1857                 error(_("too many leap seconds"));
1858                 (void) exit(EXIT_FAILURE);
1859         }
1860         for (i = 0; i < leapcnt; ++i)
1861                 if (t <= trans[i]) {
1862                         if (t == trans[i]) {
1863                                 error(_("repeated leap second moment"));
1864                                 (void) exit(EXIT_FAILURE);
1865                         }
1866                         break;
1867                 }
1868         do {
1869                 for (j = leapcnt; j > i; --j) {
1870                         trans[j] = trans[j - 1];
1871                         corr[j] = corr[j - 1];
1872                         roll[j] = roll[j - 1];
1873                 }
1874                 trans[i] = t;
1875                 corr[i] = positive ? 1L : eitol(-count);
1876                 roll[i] = rolling;
1877                 ++leapcnt;
1878         } while (positive && --count != 0);
1879 }
1880
1881 static void
1882 adjleap P((void))
1883 {
1884         register int    i;
1885         register long   last = 0;
1886
1887         /*
1888         ** propagate leap seconds forward
1889         */
1890         for (i = 0; i < leapcnt; ++i) {
1891                 trans[i] = tadd(trans[i], last);
1892                 last = corr[i] += last;
1893         }
1894 }
1895
1896 static int
1897 yearistype(year, type)
1898 const int               year;
1899 const char * const      type;
1900 {
1901         static char *   buf;
1902         int             result;
1903
1904         if (type == NULL || *type == '\0')
1905                 return TRUE;
1906         buf = erealloc(buf, (int) (132 + strlen(yitcommand) + strlen(type)));
1907         (void) sprintf(buf, "%s %d %s", yitcommand, year, type);
1908         result = system(buf);
1909         if (result == 0)
1910                 return TRUE;
1911         if (result == (1 << 8))
1912                 return FALSE;
1913         error(_("Wild result from command execution"));
1914         (void) fprintf(stderr, _("%s: command was '%s', result was %d\n"),
1915                 progname, buf, result);
1916         for ( ; ; )
1917                 (void) exit(EXIT_FAILURE);
1918 }
1919
1920 static int
1921 lowerit(a)
1922 int     a;
1923 {
1924         a = (unsigned char) a;
1925         return (isascii(a) && isupper(a)) ? tolower(a) : a;
1926 }
1927
1928 static int
1929 ciequal(ap, bp)         /* case-insensitive equality */
1930 register const char *   ap;
1931 register const char *   bp;
1932 {
1933         while (lowerit(*ap) == lowerit(*bp++))
1934                 if (*ap++ == '\0')
1935                         return TRUE;
1936         return FALSE;
1937 }
1938
1939 static int
1940 itsabbr(abbr, word)
1941 register const char *   abbr;
1942 register const char *   word;
1943 {
1944         if (lowerit(*abbr) != lowerit(*word))
1945                 return FALSE;
1946         ++word;
1947         while (*++abbr != '\0')
1948                 do {
1949                         if (*word == '\0')
1950                                 return FALSE;
1951                 } while (lowerit(*word++) != lowerit(*abbr));
1952         return TRUE;
1953 }
1954
1955 static const struct lookup *
1956 byword(word, table)
1957 register const char * const             word;
1958 register const struct lookup * const    table;
1959 {
1960         register const struct lookup *  foundlp;
1961         register const struct lookup *  lp;
1962
1963         if (word == NULL || table == NULL)
1964                 return NULL;
1965         /*
1966         ** Look for exact match.
1967         */
1968         for (lp = table; lp->l_word != NULL; ++lp)
1969                 if (ciequal(word, lp->l_word))
1970                         return lp;
1971         /*
1972         ** Look for inexact match.
1973         */
1974         foundlp = NULL;
1975         for (lp = table; lp->l_word != NULL; ++lp)
1976                 if (itsabbr(word, lp->l_word)) {
1977                         if (foundlp == NULL)
1978                                 foundlp = lp;
1979                         else    return NULL;    /* multiple inexact matches */
1980                 }
1981         return foundlp;
1982 }
1983
1984 static char **
1985 getfields(cp)
1986 register char * cp;
1987 {
1988         register char *         dp;
1989         register char **        array;
1990         register int            nsubs;
1991
1992         if (cp == NULL)
1993                 return NULL;
1994         array = (char **) (void *)
1995                 emalloc((int) ((strlen(cp) + 1) * sizeof *array));
1996         nsubs = 0;
1997         for ( ; ; ) {
1998                 while (isascii(*cp) && isspace((unsigned char) *cp))
1999                         ++cp;
2000                 if (*cp == '\0' || *cp == '#')
2001                         break;
2002                 array[nsubs++] = dp = cp;
2003                 do {
2004                         if ((*dp = *cp++) != '"')
2005                                 ++dp;
2006                         else while ((*dp = *cp++) != '"')
2007                                 if (*dp != '\0')
2008                                         ++dp;
2009                                 else    error(_("Odd number of quotation marks"));
2010                 } while (*cp != '\0' && *cp != '#' &&
2011                         (!isascii(*cp) || !isspace((unsigned char) *cp)));
2012                 if (isascii(*cp) && isspace((unsigned char) *cp))
2013                         ++cp;
2014                 *dp = '\0';
2015         }
2016         array[nsubs] = NULL;
2017         return array;
2018 }
2019
2020 static long
2021 oadd(t1, t2)
2022 const long      t1;
2023 const long      t2;
2024 {
2025         register long   t;
2026
2027         t = t1 + t2;
2028         if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {
2029                 error(_("time overflow"));
2030                 (void) exit(EXIT_FAILURE);
2031         }
2032         return t;
2033 }
2034
2035 static time_t
2036 tadd(t1, t2)
2037 const time_t    t1;
2038 const long      t2;
2039 {
2040         register time_t t;
2041
2042         if (t1 == max_time && t2 > 0)
2043                 return max_time;
2044         if (t1 == min_time && t2 < 0)
2045                 return min_time;
2046         t = t1 + t2;
2047         if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {
2048                 error(_("time overflow"));
2049                 (void) exit(EXIT_FAILURE);
2050         }
2051         return t;
2052 }
2053
2054 /*
2055 ** Given a rule, and a year, compute the date - in seconds since January 1,
2056 ** 1970, 00:00 LOCAL time - in that year that the rule refers to.
2057 */
2058
2059 static time_t
2060 rpytime(rp, wantedy)
2061 register const struct rule * const      rp;
2062 register const int                      wantedy;
2063 {
2064         register int    y, m, i;
2065         register long   dayoff;                 /* with a nod to Margaret O. */
2066         register time_t t;
2067
2068         if (wantedy == INT_MIN)
2069                 return min_time;
2070         if (wantedy == INT_MAX)
2071                 return max_time;
2072         dayoff = 0;
2073         m = TM_JANUARY;
2074         y = EPOCH_YEAR;
2075         while (wantedy != y) {
2076                 if (wantedy > y) {
2077                         i = len_years[isleap(y)];
2078                         ++y;
2079                 } else {
2080                         --y;
2081                         i = -len_years[isleap(y)];
2082                 }
2083                 dayoff = oadd(dayoff, eitol(i));
2084         }
2085         while (m != rp->r_month) {
2086                 i = len_months[isleap(y)][m];
2087                 dayoff = oadd(dayoff, eitol(i));
2088                 ++m;
2089         }
2090         i = rp->r_dayofmonth;
2091         if (m == TM_FEBRUARY && i == 29 && !isleap(y)) {
2092                 if (rp->r_dycode == DC_DOWLEQ)
2093                         --i;
2094                 else {
2095                         error(_("use of 2/29 in non leap-year"));
2096                         (void) exit(EXIT_FAILURE);
2097                 }
2098         }
2099         --i;
2100         dayoff = oadd(dayoff, eitol(i));
2101         if (rp->r_dycode == DC_DOWGEQ || rp->r_dycode == DC_DOWLEQ) {
2102                 register long   wday;
2103
2104 #define LDAYSPERWEEK    ((long) DAYSPERWEEK)
2105                 wday = eitol(EPOCH_WDAY);
2106                 /*
2107                 ** Don't trust mod of negative numbers.
2108                 */
2109                 if (dayoff >= 0)
2110                         wday = (wday + dayoff) % LDAYSPERWEEK;
2111                 else {
2112                         wday -= ((-dayoff) % LDAYSPERWEEK);
2113                         if (wday < 0)
2114                                 wday += LDAYSPERWEEK;
2115                 }
2116                 while (wday != eitol(rp->r_wday))
2117                         if (rp->r_dycode == DC_DOWGEQ) {
2118                                 dayoff = oadd(dayoff, (long) 1);
2119                                 if (++wday >= LDAYSPERWEEK)
2120                                         wday = 0;
2121                                 ++i;
2122                         } else {
2123                                 dayoff = oadd(dayoff, (long) -1);
2124                                 if (--wday < 0)
2125                                         wday = LDAYSPERWEEK - 1;
2126                                 --i;
2127                         }
2128                 if (i < 0 || i >= len_months[isleap(y)][m]) {
2129                         error(_("no day in month matches rule"));
2130                         (void) exit(EXIT_FAILURE);
2131                 }
2132         }
2133         if (dayoff < 0 && !TYPE_SIGNED(time_t))
2134                 return min_time;
2135         t = (time_t) dayoff * SECSPERDAY;
2136         /*
2137         ** Cheap overflow check.
2138         */
2139         if (t / SECSPERDAY != dayoff)
2140                 return (dayoff > 0) ? max_time : min_time;
2141         return tadd(t, rp->r_tod);
2142 }
2143
2144 static void
2145 newabbr(string)
2146 const char * const      string;
2147 {
2148         register int    i;
2149
2150         i = strlen(string) + 1;
2151         if (charcnt + i > TZ_MAX_CHARS) {
2152                 error(_("too many, or too long, time zone abbreviations"));
2153                 (void) exit(EXIT_FAILURE);
2154         }
2155         (void) strcpy(&chars[charcnt], string);
2156         charcnt += eitol(i);
2157 }
2158
2159 static int
2160 mkdirs(argname)
2161 char * const    argname;
2162 {
2163         register char * name;
2164         register char * cp;
2165
2166         if (argname == NULL || *argname == '\0')
2167                 return 0;
2168         cp = name = ecpyalloc(argname);
2169         while ((cp = strchr(cp + 1, '/')) != 0) {
2170                 *cp = '\0';
2171 #ifndef unix
2172                 /*
2173                 ** DOS drive specifier?
2174                 */
2175                 if (isalpha((unsigned char) name[0]) &&
2176                         name[1] == ':' && name[2] == '\0') {
2177                                 *cp = '/';
2178                                 continue;
2179                 }
2180 #endif /* !defined unix */
2181                 if (!itsdir(name)) {
2182                         /*
2183                         ** It doesn't seem to exist, so we try to create it.
2184                         ** Creation may fail because of the directory being
2185                         ** created by some other multiprocessor, so we get
2186                         ** to do extra checking.
2187                         */
2188                         if (mkdir(name, S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH) != 0) {
2189                                 const char *e = strerror(errno);
2190
2191                                 if (errno != EEXIST || !itsdir(name)) {
2192                                         (void) fprintf(stderr,
2193 _("%s: Can't create directory %s: %s\n"),
2194                                                 progname, name, e);
2195                                         ifree(name);
2196                                         return -1;
2197                                 }
2198                         }
2199                 }
2200                 *cp = '/';
2201         }
2202         ifree(name);
2203         return 0;
2204 }
2205
2206 static long
2207 eitol(i)
2208 const int       i;
2209 {
2210         long    l;
2211
2212         l = i;
2213         if ((i < 0 && l >= 0) || (i == 0 && l != 0) || (i > 0 && l <= 0)) {
2214                 (void) fprintf(stderr,
2215                         _("%s: %d did not sign extend correctly\n"),
2216                         progname, i);
2217                 (void) exit(EXIT_FAILURE);
2218         }
2219         return l;
2220 }
2221
2222 /*
2223 ** UNIX was a registered trademark of UNIX System Laboratories in 1993.
2224 */