time/zic.c

   1 #ifndef lint
   2 #ifndef NOID
   3 static char     elsieid[] = "@(#)zic.c  7.50";
   4 #endif /* !defined NOID */
   5 #endif /* !defined lint */
   6
   7 #include "private.h"
   8 #include "tzfile.h"
   9 #ifdef unix
  10 #include "sys/stat.h"                   /* for umask manifest constants */
  11 #endif /* defined unix */
  12
  13 struct rule {
  14         const char *    r_filename;
  15         int             r_linenum;
  16         const char *    r_name;
  17
  18         int             r_loyear;       /* for example, 1986 */
  19         int             r_hiyear;       /* for example, 1986 */
  20         const char *    r_yrtype;
  21
  22         int             r_month;        /* 0..11 */
  23
  24         int             r_dycode;       /* see below */
  25         int             r_dayofmonth;
  26         int             r_wday;
  27
  28         long            r_tod;          /* time from midnight */
  29         int             r_todisstd;     /* above is standard time if TRUE */
  30                                         /* or wall clock time if FALSE */
  31         int             r_todisgmt;     /* above is GMT if TRUE */
  32                                         /* or local time if FALSE */
  33         long            r_stdoff;       /* offset from standard time */
  34         const char *    r_abbrvar;      /* variable part of abbreviation */
  35
  36         int             r_todo;         /* a rule to do (used in outzone) */
  37         time_t          r_temp;         /* used in outzone */
  38 };
  39
  40 /*
  41 **      r_dycode                r_dayofmonth    r_wday
  42 */
  43
  44 #define DC_DOM          0       /* 1..31 */     /* unused */
  45 #define DC_DOWGEQ       1       /* 1..31 */     /* 0..6 (Sun..Sat) */
  46 #define DC_DOWLEQ       2       /* 1..31 */     /* 0..6 (Sun..Sat) */
  47
  48 struct zone {
  49         const char *    z_filename;
  50         int             z_linenum;
  51
  52         const char *    z_name;
  53         long            z_gmtoff;
  54         const char *    z_rule;
  55         const char *    z_format;
  56
  57         long            z_stdoff;
  58
  59         struct rule *   z_rules;
  60         int             z_nrules;
  61
  62         struct rule     z_untilrule;
  63         time_t          z_untiltime;
  64 };
  65
  66 extern int      getopt P((int argc, char * const argv[],
  67                         const char * options));
  68 extern char *   icatalloc P((char * old, const char * new));
  69 extern char *   icpyalloc P((const char * string));
  70 extern void     ifree P((char * p));
  71 extern char *   imalloc P((int n));
  72 extern void *   irealloc P((void * old, int n));
  73 extern int      link P((const char * fromname, const char * toname));
  74 extern char *   optarg;
  75 extern int      optind;
  76 extern char *   scheck P((const char * string, const char * format));
  77
  78 static void     addtt P((time_t starttime, int type));
  79 static int      addtype P((long gmtoff, const char * abbr, int isdst,
  80                                 int ttisstd, int ttisgmt));
  81 static void     leapadd P((time_t t, int positive, int rolling, int count));
  82 static void     adjleap P((void));
  83 static void     associate P((void));
  84 static int      ciequal P((const char * ap, const char * bp));
  85 static void     convert P((long val, char * buf));
  86 static void     dolink P((const char * fromfile, const char * tofile));
  87 static void     doabbr P((char * abbr, const char * format,
  88                         const char * letters, int isdst));
  89 static void     eat P((const char * name, int num));
  90 static void     eats P((const char * name, int num,
  91                         const char * rname, int rnum));
  92 static long     eitol P((int i));
  93 static void     error P((const char * message));
  94 static char **  getfields P((char * buf));
  95 static long     gethms P((const char * string, const char * errstrng,
  96                         int signable));
  97 static void     infile P((const char * filename));
  98 static void     inleap P((char ** fields, int nfields));
  99 static void     inlink P((char ** fields, int nfields));
 100 static void     inrule P((char ** fields, int nfields));
 101 static int      inzcont P((char ** fields, int nfields));
 102 static int      inzone P((char ** fields, int nfields));
 103 static int      inzsub P((char ** fields, int nfields, int iscont));
 104 static int      itsabbr P((const char * abbr, const char * word));
 105 static int      itsdir P((const char * name));
 106 static int      lowerit P((int c));
 107 static char *   memcheck P((char * tocheck));
 108 static int      mkdirs P((char * filename));
 109 static void     newabbr P((const char * abbr));
 110 static long     oadd P((long t1, long t2));
 111 static void     outzone P((const struct zone * zp, int ntzones));
 112 static void     puttzcode P((long code, FILE * fp));
 113 static int      rcomp P((const void * leftp, const void * rightp));
 114 static time_t   rpytime P((const struct rule * rp, int wantedy));
 115 static void     rulesub P((struct rule * rp,
 116                         const char * loyearp, const char * hiyearp,
 117                         const char * typep, const char * monthp,
 118                         const char * dayp, const char * timep));
 119 static void     setboundaries P((void));
 120 static time_t   tadd P((time_t t1, long t2));
 121 static void     usage P((void));
 122 static void     writezone P((const char * name));
 123 static int      yearistype P((int year, const char * type));
 124
 125 static int              charcnt;
 126 static int              errors;
 127 static const char *     filename;
 128 static int              leapcnt;
 129 static int              linenum;
 130 static int              max_int;
 131 static time_t           max_time;
 132 static int              max_year;
 133 static int              min_int;
 134 static time_t           min_time;
 135 static int              min_year;
 136 static int              noise;
 137 static const char *     rfilename;
 138 static int              rlinenum;
 139 static const char *     progname;
 140 static int              timecnt;
 141 static int              typecnt;
 142 static int              tt_signed;
 143
 144 /*
 145 ** Line codes.
 146 */
 147
 148 #define LC_RULE         0
 149 #define LC_ZONE         1
 150 #define LC_LINK         2
 151 #define LC_LEAP         3
 152
 153 /*
 154 ** Which fields are which on a Zone line.
 155 */
 156
 157 #define ZF_NAME         1
 158 #define ZF_GMTOFF       2
 159 #define ZF_RULE         3
 160 #define ZF_FORMAT       4
 161 #define ZF_TILYEAR      5
 162 #define ZF_TILMONTH     6
 163 #define ZF_TILDAY       7
 164 #define ZF_TILTIME      8
 165 #define ZONE_MINFIELDS  5
 166 #define ZONE_MAXFIELDS  9
 167
 168 /*
 169 ** Which fields are which on a Zone continuation line.
 170 */
 171
 172 #define ZFC_GMTOFF      0
 173 #define ZFC_RULE        1
 174 #define ZFC_FORMAT      2
 175 #define ZFC_TILYEAR     3
 176 #define ZFC_TILMONTH    4
 177 #define ZFC_TILDAY      5
 178 #define ZFC_TILTIME     6
 179 #define ZONEC_MINFIELDS 3
 180 #define ZONEC_MAXFIELDS 7
 181
 182 /*
 183 ** Which files are which on a Rule line.
 184 */
 185
 186 #define RF_NAME         1
 187 #define RF_LOYEAR       2
 188 #define RF_HIYEAR       3
 189 #define RF_COMMAND      4
 190 #define RF_MONTH        5
 191 #define RF_DAY          6
 192 #define RF_TOD          7
 193 #define RF_STDOFF       8
 194 #define RF_ABBRVAR      9
 195 #define RULE_FIELDS     10
 196
 197 /*
 198 ** Which fields are which on a Link line.
 199 */
 200
 201 #define LF_FROM         1
 202 #define LF_TO           2
 203 #define LINK_FIELDS     3
 204
 205 /*
 206 ** Which fields are which on a Leap line.
 207 */
 208
 209 #define LP_YEAR         1
 210 #define LP_MONTH        2
 211 #define LP_DAY          3
 212 #define LP_TIME         4
 213 #define LP_CORR         5
 214 #define LP_ROLL         6
 215 #define LEAP_FIELDS     7
 216
 217 /*
 218 ** Year synonyms.
 219 */
 220
 221 #define YR_MINIMUM      0
 222 #define YR_MAXIMUM      1
 223 #define YR_ONLY         2
 224
 225 static struct rule *    rules;
 226 static int              nrules; /* number of rules */
 227
 228 static struct zone *    zones;
 229 static int              nzones; /* number of zones */
 230
 231 struct link {
 232         const char *    l_filename;
 233         int             l_linenum;
 234         const char *    l_from;
 235         const char *    l_to;
 236 };
 237
 238 static struct link *    links;
 239 static int              nlinks;
 240
 241 struct lookup {
 242         const char *    l_word;
 243         const int       l_value;
 244 };
 245
 246 static struct lookup const *    byword P((const char * string,
 247                                         const struct lookup * lp));
 248
 249 static struct lookup const      line_codes[] = {
 250         { "Rule",       LC_RULE },
 251         { "Zone",       LC_ZONE },
 252         { "Link",       LC_LINK },
 253         { "Leap",       LC_LEAP },
 254         { NULL,         0}
 255 };
 256
 257 static struct lookup const      mon_names[] = {
 258         { "January",    TM_JANUARY },
 259         { "February",   TM_FEBRUARY },
 260         { "March",      TM_MARCH },
 261         { "April",      TM_APRIL },
 262         { "May",        TM_MAY },
 263         { "June",       TM_JUNE },
 264         { "July",       TM_JULY },
 265         { "August",     TM_AUGUST },
 266         { "September",  TM_SEPTEMBER },
 267         { "October",    TM_OCTOBER },
 268         { "November",   TM_NOVEMBER },
 269         { "December",   TM_DECEMBER },
 270         { NULL,         0 }
 271 };
 272
 273 static struct lookup const      wday_names[] = {
 274         { "Sunday",     TM_SUNDAY },
 275         { "Monday",     TM_MONDAY },
 276         { "Tuesday",    TM_TUESDAY },
 277         { "Wednesday",  TM_WEDNESDAY },
 278         { "Thursday",   TM_THURSDAY },
 279         { "Friday",     TM_FRIDAY },
 280         { "Saturday",   TM_SATURDAY },
 281         { NULL,         0 }
 282 };
 283
 284 static struct lookup const      lasts[] = {
 285         { "last-Sunday",        TM_SUNDAY },
 286         { "last-Monday",        TM_MONDAY },
 287         { "last-Tuesday",       TM_TUESDAY },
 288         { "last-Wednesday",     TM_WEDNESDAY },
 289         { "last-Thursday",      TM_THURSDAY },
 290         { "last-Friday",        TM_FRIDAY },
 291         { "last-Saturday",      TM_SATURDAY },
 292         { NULL,                 0 }
 293 };
 294
 295 static struct lookup const      begin_years[] = {
 296         { "minimum",    YR_MINIMUM },
 297         { "maximum",    YR_MAXIMUM },
 298         { NULL,         0 }
 299 };
 300
 301 static struct lookup const      end_years[] = {
 302         { "minimum",    YR_MINIMUM },
 303         { "maximum",    YR_MAXIMUM },
 304         { "only",       YR_ONLY },
 305         { NULL,         0 }
 306 };
 307
 308 static struct lookup const      leap_types[] = {
 309         { "Rolling",    TRUE },
 310         { "Stationary", FALSE },
 311         { NULL,         0 }
 312 };
 313
 314 static const int        len_months[2][MONSPERYEAR] = {
 315         { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
 316         { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
 317 };
 318
 319 static const int        len_years[2] = {
 320         DAYSPERNYEAR, DAYSPERLYEAR
 321 };
 322
 323 static time_t           ats[TZ_MAX_TIMES];
 324 static unsigned char    types[TZ_MAX_TIMES];
 325 static long             gmtoffs[TZ_MAX_TYPES];
 326 static char             isdsts[TZ_MAX_TYPES];
 327 static unsigned char    abbrinds[TZ_MAX_TYPES];
 328 static char             ttisstds[TZ_MAX_TYPES];
 329 static char             ttisgmts[TZ_MAX_TYPES];
 330 static char             chars[TZ_MAX_CHARS];
 331 static time_t           trans[TZ_MAX_LEAPS];
 332 static long             corr[TZ_MAX_LEAPS];
 333 static char             roll[TZ_MAX_LEAPS];
 334
 335 /*
 336 ** Memory allocation.
 337 */
 338
 339 static char *
 340 memcheck(ptr)
 341 char * const    ptr;
 342 {
 343         if (ptr == NULL) {
 344                 (void) perror(progname);
 345                 (void) exit(EXIT_FAILURE);
 346         }
 347         return ptr;
 348 }
 349
 350 #define emalloc(size)           memcheck(imalloc(size))
 351 #define erealloc(ptr, size)     memcheck(irealloc((ptr), (size)))
 352 #define ecpyalloc(ptr)          memcheck(icpyalloc(ptr))
 353 #define ecatalloc(oldp, newp)   memcheck(icatalloc((oldp), (newp)))
 354
 355 /*
 356 ** Error handling.
 357 */
 358
 359 static void
 360 eats(name, num, rname, rnum)
 361 const char * const      name;
 362 const int               num;
 363 const char * const      rname;
 364 const int               rnum;
 365 {
 366         filename = name;
 367         linenum = num;
 368         rfilename = rname;
 369         rlinenum = rnum;
 370 }
 371
 372 static void
 373 eat(name, num)
 374 const char * const      name;
 375 const int               num;
 376 {
 377         eats(name, num, (char *) NULL, -1);
 378 }
 379
 380 static void
 381 error(string)
 382 const char * const      string;
 383 {
 384         /*
 385         ** Match the format of "cc" to allow sh users to
 386         **      zic ... 2>&1 | error -t "*" -v
 387         ** on BSD systems.
 388         */
 389         (void) fprintf(stderr, "\"%s\", line %d: %s",
 390                 filename, linenum, string);
 391         if (rfilename != NULL)
 392                 (void) fprintf(stderr, " (rule from \"%s\", line %d)",
 393                         rfilename, rlinenum);
 394         (void) fprintf(stderr, "\n");
 395         ++errors;
 396 }
 397
 398 static void
 399 usage P((void))
 400 {
 401         (void) fprintf(stderr, "%s: usage is %s \
 402 [ -s ] [ -v ] [ -l localtime ] [ -p posixrules ] [ -d directory ]\n\
 403 \t[ -L leapseconds ] [ -y yearistype ] [ filename ... ]\n",
 404                 progname, progname);
 405         (void) exit(EXIT_FAILURE);
 406 }
 407
 408 static const char *     psxrules;
 409 static const char *     lcltime;
 410 static const char *     directory;
 411 static const char *     leapsec;
 412 static const char *     yitcommand;
 413 static int              sflag = FALSE;
 414
 415 int
 416 main(argc, argv)
 417 int     argc;
 418 char *  argv[];
 419 {
 420         register int    i;
 421         register int    j;
 422         register int    c;
 423
 424 #ifdef unix
 425         (void) umask(umask(S_IWGRP | S_IWOTH) | (S_IWGRP | S_IWOTH));
 426 #endif /* defined unix */
 427         progname = argv[0];
 428         while ((c = getopt(argc, argv, "d:l:p:L:vsy:")) != EOF)
 429                 switch (c) {
 430                         default:
 431                                 usage();
 432                         case 'd':
 433                                 if (directory == NULL)
 434                                         directory = optarg;
 435                                 else {
 436                                         (void) fprintf(stderr,
 437 "%s: More than one -d option specified\n",
 438                                                 progname);
 439                                         (void) exit(EXIT_FAILURE);
 440                                 }
 441                                 break;
 442                         case 'l':
 443                                 if (lcltime == NULL)
 444                                         lcltime = optarg;
 445                                 else {
 446                                         (void) fprintf(stderr,
 447 "%s: More than one -l option specified\n",
 448                                                 progname);
 449                                         (void) exit(EXIT_FAILURE);
 450                                 }
 451                                 break;
 452                         case 'p':
 453                                 if (psxrules == NULL)
 454                                         psxrules = optarg;
 455                                 else {
 456                                         (void) fprintf(stderr,
 457 "%s: More than one -p option specified\n",
 458                                                 progname);
 459                                         (void) exit(EXIT_FAILURE);
 460                                 }
 461                                 break;
 462                         case 'y':
 463                                 if (yitcommand == NULL)
 464                                         yitcommand = optarg;
 465                                 else {
 466                                         (void) fprintf(stderr,
 467 "%s: More than one -y option specified\n",
 468                                                 progname);
 469                                         (void) exit(EXIT_FAILURE);
 470                                 }
 471                                 break;
 472                         case 'L':
 473                                 if (leapsec == NULL)
 474                                         leapsec = optarg;
 475                                 else {
 476                                         (void) fprintf(stderr,
 477 "%s: More than one -L option specified\n",
 478                                                 progname);
 479                                         (void) exit(EXIT_FAILURE);
 480                                 }
 481                                 break;
 482                         case 'v':
 483                                 noise = TRUE;
 484                                 break;
 485                         case 's':
 486                                 sflag = TRUE;
 487                                 break;
 488                 }
 489         if (optind == argc - 1 && strcmp(argv[optind], "=") == 0)
 490                 usage();        /* usage message by request */
 491         if (directory == NULL)
 492                 directory = TZDIR;
 493         if (yitcommand == NULL)
 494                 yitcommand = "yearistype";
 495
 496         setboundaries();
 497
 498         if (optind < argc && leapsec != NULL) {
 499                 infile(leapsec);
 500                 adjleap();
 501         }
 502
 503         for (i = optind; i < argc; ++i)
 504                 infile(argv[i]);
 505         if (errors)
 506                 (void) exit(EXIT_FAILURE);
 507         associate();
 508         for (i = 0; i < nzones; i = j) {
 509                 /*
 510                 ** Find the next non-continuation zone entry.
 511                 */
 512                 for (j = i + 1; j < nzones && zones[j].z_name == NULL; ++j)
 513                         continue;
 514                 outzone(&zones[i], j - i);
 515         }
 516         /*
 517         ** Make links.
 518         */
 519         for (i = 0; i < nlinks; ++i)
 520                 dolink(links[i].l_from, links[i].l_to);
 521         if (lcltime != NULL)
 522                 dolink(lcltime, TZDEFAULT);
 523         if (psxrules != NULL)
 524                 dolink(psxrules, TZDEFRULES);
 525         return (errors == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
 526 }
 527
 528 static void
 529 dolink(fromfile, tofile)
 530 const char * const      fromfile;
 531 const char * const      tofile;
 532 {
 533         register char * fromname;
 534         register char * toname;
 535
 536         if (fromfile[0] == '/')
 537                 fromname = ecpyalloc(fromfile);
 538         else {
 539                 fromname = ecpyalloc(directory);
 540                 fromname = ecatalloc(fromname, "/");
 541                 fromname = ecatalloc(fromname, fromfile);
 542         }
 543         if (tofile[0] == '/')
 544                 toname = ecpyalloc(tofile);
 545         else {
 546                 toname = ecpyalloc(directory);
 547                 toname = ecatalloc(toname, "/");
 548                 toname = ecatalloc(toname, tofile);
 549         }
 550         /*
 551         ** We get to be careful here since
 552         ** there's a fair chance of root running us.
 553         */
 554         if (!itsdir(toname))
 555                 (void) remove(toname);
 556         if (link(fromname, toname) != 0) {
 557                 if (mkdirs(toname) != 0)
 558                         (void) exit(EXIT_FAILURE);
 559                 if (link(fromname, toname) != 0) {
 560                         (void) fprintf(stderr, "%s: Can't link from %s to ",
 561                                 progname, fromname);
 562                         (void) perror(toname);
 563                         (void) exit(EXIT_FAILURE);
 564                 }
 565         }
 566         ifree(fromname);
 567         ifree(toname);
 568 }
 569
 570 static void
 571 setboundaries P((void))
 572 {
 573         register time_t bit;
 574         register int bii;
 575
 576         for (bit = 1; bit > 0; bit <<= 1)
 577                 continue;
 578         if (bit == 0) {         /* time_t is an unsigned type */
 579                 tt_signed = FALSE;
 580                 min_time = 0;
 581                 max_time = ~(time_t) 0;
 582                 if (sflag)
 583                         max_time >>= 1;
 584         } else {
 585                 tt_signed = TRUE;
 586                 min_time = bit;
 587                 max_time = bit;
 588                 ++max_time;
 589                 max_time = -max_time;
 590                 if (sflag)
 591                         min_time = 0;
 592         }
 593         min_year = TM_YEAR_BASE + gmtime(&min_time)->tm_year;
 594         max_year = TM_YEAR_BASE + gmtime(&max_time)->tm_year;
 595
 596         for (bii = 1; bii > 0; bii <<= 1)
 597                 continue;
 598         min_int = bii;
 599         max_int = -1 - bii;
 600 }
 601
 602 static int
 603 itsdir(name)
 604 const char * const      name;
 605 {
 606         register char * myname;
 607         register int    accres;
 608
 609         myname = ecpyalloc(name);
 610         myname = ecatalloc(myname, "/.");
 611         accres = access(myname, F_OK);
 612         ifree(myname);
 613         return accres == 0;
 614 }
 615
 616 /*
 617 ** Associate sets of rules with zones.
 618 */
 619
 620 /*
 621 ** Sort by rule name.
 622 */
 623
 624 static int
 625 rcomp(cp1, cp2)
 626 const void *    cp1;
 627 const void *    cp2;
 628 {
 629         return strcmp(((const struct rule *) cp1)->r_name,
 630                 ((const struct rule *) cp2)->r_name);
 631 }
 632
 633 static void
 634 associate P((void))
 635 {
 636         register struct zone *  zp;
 637         register struct rule *  rp;
 638         register int            base, out;
 639         register int            i;
 640
 641         if (nrules != 0)
 642                 (void) qsort((void *) rules, (size_t) nrules,
 643                         (size_t) sizeof *rules, rcomp);
 644         for (i = 0; i < nzones; ++i) {
 645                 zp = &zones[i];
 646                 zp->z_rules = NULL;
 647                 zp->z_nrules = 0;
 648         }
 649         for (base = 0; base < nrules; base = out) {
 650                 rp = &rules[base];
 651                 for (out = base + 1; out < nrules; ++out)
 652                         if (strcmp(rp->r_name, rules[out].r_name) != 0)
 653                                 break;
 654                 for (i = 0; i < nzones; ++i) {
 655                         zp = &zones[i];
 656                         if (strcmp(zp->z_rule, rp->r_name) != 0)
 657                                 continue;
 658                         zp->z_rules = rp;
 659                         zp->z_nrules = out - base;
 660                 }
 661         }
 662         for (i = 0; i < nzones; ++i) {
 663                 zp = &zones[i];
 664                 if (zp->z_nrules == 0) {
 665                         /*
 666                         ** Maybe we have a local standard time offset.
 667                         */
 668                         eat(zp->z_filename, zp->z_linenum);
 669                         zp->z_stdoff = gethms(zp->z_rule, "unruly zone", TRUE);
 670                         /*
 671                         ** Note, though, that if there's no rule,
 672                         ** a '%s' in the format is a bad thing.
 673                         */
 674                         if (strchr(zp->z_format, '%') != 0)
 675                                 error("%s in ruleless zone");
 676                 }
 677         }
 678         if (errors)
 679                 (void) exit(EXIT_FAILURE);
 680 }
 681
 682 static void
 683 infile(name)
 684 const char *    name;
 685 {
 686         register FILE *                 fp;
 687         register char **                fields;
 688         register char *                 cp;
 689         register const struct lookup *  lp;
 690         register int                    nfields;
 691         register int                    wantcont;
 692         register int                    num;
 693         char                            buf[BUFSIZ];
 694
 695         if (strcmp(name, "-") == 0) {
 696                 name = "standard input";
 697                 fp = stdin;
 698         } else if ((fp = fopen(name, "r")) == NULL) {
 699                 (void) fprintf(stderr, "%s: Can't open ", progname);
 700                 (void) perror(name);
 701                 (void) exit(EXIT_FAILURE);
 702         }
 703         wantcont = FALSE;
 704         for (num = 1; ; ++num) {
 705                 eat(name, num);
 706                 if (fgets(buf, (int) sizeof buf, fp) != buf)
 707                         break;
 708                 cp = strchr(buf, '\n');
 709                 if (cp == NULL) {
 710                         error("line too long");
 711                         (void) exit(EXIT_FAILURE);
 712                 }
 713                 *cp = '\0';
 714                 fields = getfields(buf);
 715                 nfields = 0;
 716                 while (fields[nfields] != NULL) {
 717                         static char     nada;
 718
 719                         if (ciequal(fields[nfields], "-"))
 720                                 fields[nfields] = &nada;
 721                         ++nfields;
 722                 }
 723                 if (nfields == 0) {
 724                         /* nothing to do */
 725                 } else if (wantcont) {
 726                         wantcont = inzcont(fields, nfields);
 727                 } else {
 728                         lp = byword(fields[0], line_codes);
 729                         if (lp == NULL)
 730                                 error("input line of unknown type");
 731                         else switch ((int) (lp->l_value)) {
 732                                 case LC_RULE:
 733                                         inrule(fields, nfields);
 734                                         wantcont = FALSE;
 735                                         break;
 736                                 case LC_ZONE:
 737                                         wantcont = inzone(fields, nfields);
 738                                         break;
 739                                 case LC_LINK:
 740                                         inlink(fields, nfields);
 741                                         wantcont = FALSE;
 742                                         break;
 743                                 case LC_LEAP:
 744                                         if (name != leapsec)
 745                                                 (void) fprintf(stderr,
 746 "%s: Leap line in non leap seconds file %s\n",
 747                                                         progname, name);
 748                                         else    inleap(fields, nfields);
 749                                         wantcont = FALSE;
 750                                         break;
 751                                 default:        /* "cannot happen" */
 752                                         (void) fprintf(stderr,
 753 "%s: panic: Invalid l_value %d\n",
 754                                                 progname, lp->l_value);
 755                                         (void) exit(EXIT_FAILURE);
 756                         }
 757                 }
 758                 ifree((char *) fields);
 759         }
 760         if (ferror(fp)) {
 761                 (void) fprintf(stderr, "%s: Error reading ", progname);
 762                 (void) perror(filename);
 763                 (void) exit(EXIT_FAILURE);
 764         }
 765         if (fp != stdin && fclose(fp)) {
 766                 (void) fprintf(stderr, "%s: Error closing ", progname);
 767                 (void) perror(filename);
 768                 (void) exit(EXIT_FAILURE);
 769         }
 770         if (wantcont)
 771                 error("expected continuation line not found");
 772 }
 773
 774 /*
 775 ** Convert a string of one of the forms
 776 **      h       -h      hh:mm   -hh:mm  hh:mm:ss        -hh:mm:ss
 777 ** into a number of seconds.
 778 ** A null string maps to zero.
 779 ** Call error with errstring and return zero on errors.
 780 */
 781
 782 static long
 783 gethms(string, errstring, signable)
 784 const char *            string;
 785 const char * const      errstring;
 786 const int               signable;
 787 {
 788         int     hh, mm, ss, sign;
 789
 790         if (string == NULL || *string == '\0')
 791                 return 0;
 792         if (!signable)
 793                 sign = 1;
 794         else if (*string == '-') {
 795                 sign = -1;
 796                 ++string;
 797         } else  sign = 1;
 798         if (sscanf(string, scheck(string, "%d"), &hh) == 1)
 799                 mm = ss = 0;
 800         else if (sscanf(string, scheck(string, "%d:%d"), &hh, &mm) == 2)
 801                 ss = 0;
 802         else if (sscanf(string, scheck(string, "%d:%d:%d"),
 803                 &hh, &mm, &ss) != 3) {
 804                         error(errstring);
 805                         return 0;
 806         }
 807         if (hh < 0 || hh >= HOURSPERDAY ||
 808                 mm < 0 || mm >= MINSPERHOUR ||
 809                 ss < 0 || ss > SECSPERMIN) {
 810                         error(errstring);
 811                         return 0;
 812         }
 813         return eitol(sign) *
 814                 (eitol(hh * MINSPERHOUR + mm) *
 815                 eitol(SECSPERMIN) + eitol(ss));
 816 }
 817
 818 static void
 819 inrule(fields, nfields)
 820 register char ** const  fields;
 821 const int               nfields;
 822 {
 823         static struct rule      r;
 824
 825         if (nfields != RULE_FIELDS) {
 826                 error("wrong number of fields on Rule line");
 827                 return;
 828         }
 829         if (*fields[RF_NAME] == '\0') {
 830                 error("nameless rule");
 831                 return;
 832         }
 833         r.r_filename = filename;
 834         r.r_linenum = linenum;
 835         r.r_stdoff = gethms(fields[RF_STDOFF], "invalid saved time", TRUE);
 836         rulesub(&r, fields[RF_LOYEAR], fields[RF_HIYEAR], fields[RF_COMMAND],
 837                 fields[RF_MONTH], fields[RF_DAY], fields[RF_TOD]);
 838         r.r_name = ecpyalloc(fields[RF_NAME]);
 839         r.r_abbrvar = ecpyalloc(fields[RF_ABBRVAR]);
 840         rules = (struct rule *) (void *) erealloc((char *) rules,
 841                 (int) ((nrules + 1) * sizeof *rules));
 842         rules[nrules++] = r;
 843 }
 844
 845 static int
 846 inzone(fields, nfields)
 847 register char ** const  fields;
 848 const int               nfields;
 849 {
 850         register int    i;
 851         static char *   buf;
 852
 853         if (nfields < ZONE_MINFIELDS || nfields > ZONE_MAXFIELDS) {
 854                 error("wrong number of fields on Zone line");
 855                 return FALSE;
 856         }
 857         if (strcmp(fields[ZF_NAME], TZDEFAULT) == 0 && lcltime != NULL) {
 858                 buf = erealloc(buf, (int) (132 + strlen(TZDEFAULT)));
 859                 (void) sprintf(buf,
 860 "\"Zone %s\" line and -l option are mutually exclusive",
 861                         TZDEFAULT);
 862                 error(buf);
 863                 return FALSE;
 864         }
 865         if (strcmp(fields[ZF_NAME], TZDEFRULES) == 0 && psxrules != NULL) {
 866                 buf = erealloc(buf, (int) (132 + strlen(TZDEFRULES)));
 867                 (void) sprintf(buf,
 868 "\"Zone %s\" line and -p option are mutually exclusive",
 869                         TZDEFRULES);
 870                 error(buf);
 871                 return FALSE;
 872         }
 873         for (i = 0; i < nzones; ++i)
 874                 if (zones[i].z_name != NULL &&
 875                         strcmp(zones[i].z_name, fields[ZF_NAME]) == 0) {
 876                                 buf = erealloc(buf, (int) (132 +
 877                                         strlen(fields[ZF_NAME]) +
 878                                         strlen(zones[i].z_filename)));
 879                                 (void) sprintf(buf,
 880 "duplicate zone name %s (file \"%s\", line %d)",
 881                                         fields[ZF_NAME],
 882                                         zones[i].z_filename,
 883                                         zones[i].z_linenum);
 884                                 error(buf);
 885                                 return FALSE;
 886                 }
 887         return inzsub(fields, nfields, FALSE);
 888 }
 889
 890 static int
 891 inzcont(fields, nfields)
 892 register char ** const  fields;
 893 const int               nfields;
 894 {
 895         if (nfields < ZONEC_MINFIELDS || nfields > ZONEC_MAXFIELDS) {
 896                 error("wrong number of fields on Zone continuation line");
 897                 return FALSE;
 898         }
 899         return inzsub(fields, nfields, TRUE);
 900 }
 901
 902 static int
 903 inzsub(fields, nfields, iscont)
 904 register char ** const  fields;
 905 const int               nfields;
 906 const int               iscont;
 907 {
 908         register char *         cp;
 909         static struct zone      z;
 910         register int            i_gmtoff, i_rule, i_format;
 911         register int            i_untilyear, i_untilmonth;
 912         register int            i_untilday, i_untiltime;
 913         register int            hasuntil;
 914
 915         if (iscont) {
 916                 i_gmtoff = ZFC_GMTOFF;
 917                 i_rule = ZFC_RULE;
 918                 i_format = ZFC_FORMAT;
 919                 i_untilyear = ZFC_TILYEAR;
 920                 i_untilmonth = ZFC_TILMONTH;
 921                 i_untilday = ZFC_TILDAY;
 922                 i_untiltime = ZFC_TILTIME;
 923                 z.z_name = NULL;
 924         } else {
 925                 i_gmtoff = ZF_GMTOFF;
 926                 i_rule = ZF_RULE;
 927                 i_format = ZF_FORMAT;
 928                 i_untilyear = ZF_TILYEAR;
 929                 i_untilmonth = ZF_TILMONTH;
 930                 i_untilday = ZF_TILDAY;
 931                 i_untiltime = ZF_TILTIME;
 932                 z.z_name = ecpyalloc(fields[ZF_NAME]);
 933         }
 934         z.z_filename = filename;
 935         z.z_linenum = linenum;
 936         z.z_gmtoff = gethms(fields[i_gmtoff], "invalid GMT offset", TRUE);
 937         if ((cp = strchr(fields[i_format], '%')) != 0) {
 938                 if (*++cp != 's' || strchr(cp, '%') != 0) {
 939                         error("invalid abbreviation format");
 940                         return FALSE;
 941                 }
 942         }
 943         z.z_rule = ecpyalloc(fields[i_rule]);
 944         z.z_format = ecpyalloc(fields[i_format]);
 945         hasuntil = nfields > i_untilyear;
 946         if (hasuntil) {
 947                 z.z_untilrule.r_filename = filename;
 948                 z.z_untilrule.r_linenum = linenum;
 949                 rulesub(&z.z_untilrule,
 950                         fields[i_untilyear],
 951                         "only",
 952                         "",
 953                         (nfields > i_untilmonth) ?
 954                         fields[i_untilmonth] : "Jan",
 955                         (nfields > i_untilday) ? fields[i_untilday] : "1",
 956                         (nfields > i_untiltime) ? fields[i_untiltime] : "0");
 957                 z.z_untiltime = rpytime(&z.z_untilrule,
 958                         z.z_untilrule.r_loyear);
 959                 if (iscont && nzones > 0 &&
 960                         z.z_untiltime > min_time &&
 961                         z.z_untiltime < max_time &&
 962                         zones[nzones - 1].z_untiltime > min_time &&
 963                         zones[nzones - 1].z_untiltime < max_time &&
 964                         zones[nzones - 1].z_untiltime >= z.z_untiltime) {
 965                                 error("Zone continuation line end time is not \
 966 after end time of previous line");
 967                                 return FALSE;
 968                 }
 969         }
 970         zones = (struct zone *) (void *) erealloc((char *) zones,
 971                 (int) ((nzones + 1) * sizeof *zones));
 972         zones[nzones++] = z;
 973         /*
 974         ** If there was an UNTIL field on this line,
 975         ** there's more information about the zone on the next line.
 976         */
 977         return hasuntil;
 978 }
 979
 980 static void
 981 inleap(fields, nfields)
 982 register char ** const  fields;
 983 const int               nfields;
 984 {
 985         register const char *           cp;
 986         register const struct lookup *  lp;
 987         register int                    i, j;
 988         int                             year, month, day;
 989         long                            dayoff, tod;
 990         time_t                          t;
 991
 992         if (nfields != LEAP_FIELDS) {
 993                 error("wrong number of fields on Leap line");
 994                 return;
 995         }
 996         dayoff = 0;
 997         cp = fields[LP_YEAR];
 998         if (sscanf(cp, scheck(cp, "%d"), &year) != 1) {
 999                         /*
1000                          * Leapin' Lizards!
1001                          */
1002                         error("invalid leaping year");
1003                         return;
1004         }
1005         j = EPOCH_YEAR;
1006         while (j != year) {
1007                 if (year > j) {
1008                         i = len_years[isleap(j)];
1009                         ++j;
1010                 } else {
1011                         --j;
1012                         i = -len_years[isleap(j)];
1013                 }
1014                 dayoff = oadd(dayoff, eitol(i));
1015         }
1016         if ((lp = byword(fields[LP_MONTH], mon_names)) == NULL) {
1017                 error("invalid month name");
1018                 return;
1019         }
1020         month = lp->l_value;
1021         j = TM_JANUARY;
1022         while (j != month) {
1023                 i = len_months[isleap(year)][j];
1024                 dayoff = oadd(dayoff, eitol(i));
1025                 ++j;
1026         }
1027         cp = fields[LP_DAY];
1028         if (sscanf(cp, scheck(cp, "%d"), &day) != 1 ||
1029                 day <= 0 || day > len_months[isleap(year)][month]) {
1030                         error("invalid day of month");
1031                         return;
1032         }
1033         dayoff = oadd(dayoff, eitol(day - 1));
1034         if (dayoff < 0 && !tt_signed) {
1035                 error("time before zero");
1036                 return;
1037         }
1038         t = (time_t) dayoff * SECSPERDAY;
1039         /*
1040         ** Cheap overflow check.
1041         */
1042         if (t / SECSPERDAY != dayoff) {
1043                 error("time overflow");
1044                 return;
1045         }
1046         tod = gethms(fields[LP_TIME], "invalid time of day", FALSE);
1047         cp = fields[LP_CORR];
1048         {
1049                 register int    positive;
1050                 int             count;
1051
1052                 if (strcmp(cp, "") == 0) { /* infile() turns "-" into "" */
1053                         positive = FALSE;
1054                         count = 1;
1055                 } else if (strcmp(cp, "--") == 0) {
1056                         positive = FALSE;
1057                         count = 2;
1058                 } else if (strcmp(cp, "+") == 0) {
1059                         positive = TRUE;
1060                         count = 1;
1061                 } else if (strcmp(cp, "++") == 0) {
1062                         positive = TRUE;
1063                         count = 2;
1064                 } else {
1065                         error("illegal CORRECTION field on Leap line");
1066                         return;
1067                 }
1068                 if ((lp = byword(fields[LP_ROLL], leap_types)) == NULL) {
1069                         error("illegal Rolling/Stationary field on Leap line");
1070                         return;
1071                 }
1072                 leapadd(tadd(t, tod), positive, lp->l_value, count);
1073         }
1074 }
1075
1076 static void
1077 inlink(fields, nfields)
1078 register char ** const  fields;
1079 const int               nfields;
1080 {
1081         struct link     l;
1082
1083         if (nfields != LINK_FIELDS) {
1084                 error("wrong number of fields on Link line");
1085                 return;
1086         }
1087         if (*fields[LF_FROM] == '\0') {
1088                 error("blank FROM field on Link line");
1089                 return;
1090         }
1091         if (*fields[LF_TO] == '\0') {
1092                 error("blank TO field on Link line");
1093                 return;
1094         }
1095         l.l_filename = filename;
1096         l.l_linenum = linenum;
1097         l.l_from = ecpyalloc(fields[LF_FROM]);
1098         l.l_to = ecpyalloc(fields[LF_TO]);
1099         links = (struct link *) (void *) erealloc((char *) links,
1100                 (int) ((nlinks + 1) * sizeof *links));
1101         links[nlinks++] = l;
1102 }
1103
1104 static void
1105 rulesub(rp, loyearp, hiyearp, typep, monthp, dayp, timep)
1106 register struct rule * const    rp;
1107 const char * const              loyearp;
1108 const char * const              hiyearp;
1109 const char * const              typep;
1110 const char * const              monthp;
1111 const char * const              dayp;
1112 const char * const              timep;
1113 {
1114         register const struct lookup *  lp;
1115         register const char *           cp;
1116         register char *                 dp;
1117         register char *                 ep;
1118
1119         if ((lp = byword(monthp, mon_names)) == NULL) {
1120                 error("invalid month name");
1121                 return;
1122         }
1123         rp->r_month = lp->l_value;
1124         rp->r_todisstd = FALSE;
1125         rp->r_todisgmt = FALSE;
1126         dp = ecpyalloc(timep);
1127         if (*dp != '\0') {
1128                 ep = dp + strlen(dp) - 1;
1129                 switch (lowerit(*ep)) {
1130                         case 's':       /* Standard */
1131                                 rp->r_todisstd = TRUE;
1132                                 rp->r_todisgmt = FALSE;
1133                                 *ep = '\0';
1134                                 break;
1135                         case 'w':       /* Wall */
1136                                 rp->r_todisstd = FALSE;
1137                                 rp->r_todisgmt = FALSE;
1138                                 *ep = '\0';
1139                         case 'g':       /* Greenwich */
1140                         case 'u':       /* Universal */
1141                         case 'z':       /* Zulu */
1142                                 rp->r_todisstd = TRUE;
1143                                 rp->r_todisgmt = TRUE;
1144                                 *ep = '\0';
1145                                 break;
1146                 }
1147         }
1148         rp->r_tod = gethms(dp, "invalid time of day", FALSE);
1149         ifree(dp);
1150         /*
1151         ** Year work.
1152         */
1153         cp = loyearp;
1154         lp = byword(cp, begin_years);
1155         if (lp != NULL) switch ((int) lp->l_value) {
1156                 case YR_MINIMUM:
1157                         rp->r_loyear = min_int;
1158                         break;
1159                 case YR_MAXIMUM:
1160                         rp->r_loyear = max_int;
1161                         break;
1162                 default:        /* "cannot happen" */
1163                         (void) fprintf(stderr,
1164                                 "%s: panic: Invalid l_value %d\n",
1165                                 progname, lp->l_value);
1166                         (void) exit(EXIT_FAILURE);
1167         } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_loyear) != 1) {
1168                 error("invalid starting year");
1169                 return;
1170         }
1171         cp = hiyearp;
1172         if ((lp = byword(cp, end_years)) != NULL) switch ((int) lp->l_value) {
1173                 case YR_MINIMUM:
1174                         rp->r_hiyear = min_int;
1175                         break;
1176                 case YR_MAXIMUM:
1177                         rp->r_hiyear = max_int;
1178                         break;
1179                 case YR_ONLY:
1180                         rp->r_hiyear = rp->r_loyear;
1181                         break;
1182                 default:        /* "cannot happen" */
1183                         (void) fprintf(stderr,
1184                                 "%s: panic: Invalid l_value %d\n",
1185                                 progname, lp->l_value);
1186                         (void) exit(EXIT_FAILURE);
1187         } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_hiyear) != 1) {
1188                 error("invalid ending year");
1189                 return;
1190         }
1191         if (rp->r_loyear > rp->r_hiyear) {
1192                 error("starting year greater than ending year");
1193                 return;
1194         }
1195         if (*typep == '\0')
1196                 rp->r_yrtype = NULL;
1197         else {
1198                 if (rp->r_loyear == rp->r_hiyear) {
1199                         error("typed single year");
1200                         return;
1201                 }
1202                 rp->r_yrtype = ecpyalloc(typep);
1203         }
1204         /*
1205         ** Day work.
1206         ** Accept things such as:
1207         **      1
1208         **      last-Sunday
1209         **      Sun<=20
1210         **      Sun>=7
1211         */
1212         dp = ecpyalloc(dayp);
1213         if ((lp = byword(dp, lasts)) != NULL) {
1214                 rp->r_dycode = DC_DOWLEQ;
1215                 rp->r_wday = lp->l_value;
1216                 rp->r_dayofmonth = len_months[1][rp->r_month];
1217         } else {
1218                 if ((ep = strchr(dp, '<')) != 0)
1219                         rp->r_dycode = DC_DOWLEQ;
1220                 else if ((ep = strchr(dp, '>')) != 0)
1221                         rp->r_dycode = DC_DOWGEQ;
1222                 else {
1223                         ep = dp;
1224                         rp->r_dycode = DC_DOM;
1225                 }
1226                 if (rp->r_dycode != DC_DOM) {
1227                         *ep++ = 0;
1228                         if (*ep++ != '=') {
1229                                 error("invalid day of month");
1230                                 ifree(dp);
1231                                 return;
1232                         }
1233                         if ((lp = byword(dp, wday_names)) == NULL) {
1234                                 error("invalid weekday name");
1235                                 ifree(dp);
1236                                 return;
1237                         }
1238                         rp->r_wday = lp->l_value;
1239                 }
1240                 if (sscanf(ep, scheck(ep, "%d"), &rp->r_dayofmonth) != 1 ||
1241                         rp->r_dayofmonth <= 0 ||
1242                         (rp->r_dayofmonth > len_months[1][rp->r_month])) {
1243                                 error("invalid day of month");
1244                                 ifree(dp);
1245                                 return;
1246                 }
1247         }
1248         ifree(dp);
1249 }
1250
1251 static void
1252 convert(val, buf)
1253 const long      val;
1254 char * const    buf;
1255 {
1256         register int    i;
1257         register long   shift;
1258
1259         for (i = 0, shift = 24; i < 4; ++i, shift -= 8)
1260                 buf[i] = val >> shift;
1261 }
1262
1263 static void
1264 puttzcode(val, fp)
1265 const long      val;
1266 FILE * const    fp;
1267 {
1268         char    buf[4];
1269
1270         convert(val, buf);
1271         (void) fwrite((void *) buf, (size_t) sizeof buf, (size_t) 1, fp);
1272 }
1273
1274 static void
1275 writezone(name)
1276 const char * const      name;
1277 {
1278         register FILE *         fp;
1279         register int            i, j;
1280         static char *           fullname;
1281         static struct tzhead    tzh;
1282
1283         fullname = erealloc(fullname,
1284                 (int) (strlen(directory) + 1 + strlen(name) + 1));
1285         (void) sprintf(fullname, "%s/%s", directory, name);
1286         if ((fp = fopen(fullname, "wb")) == NULL) {
1287                 if (mkdirs(fullname) != 0)
1288                         (void) exit(EXIT_FAILURE);
1289                 if ((fp = fopen(fullname, "wb")) == NULL) {
1290                         (void) fprintf(stderr, "%s: Can't create ", progname);
1291                         (void) perror(fullname);
1292                         (void) exit(EXIT_FAILURE);
1293                 }
1294         }
1295         convert(eitol(typecnt), tzh.tzh_ttisgmtcnt);
1296         convert(eitol(typecnt), tzh.tzh_ttisstdcnt);
1297         convert(eitol(leapcnt), tzh.tzh_leapcnt);
1298         convert(eitol(timecnt), tzh.tzh_timecnt);
1299         convert(eitol(typecnt), tzh.tzh_typecnt);
1300         convert(eitol(charcnt), tzh.tzh_charcnt);
1301 #define DO(field)       (void) fwrite((void *) tzh.field, \
1302                 (size_t) sizeof tzh.field, (size_t) 1, fp)
1303         DO(tzh_reserved);
1304         DO(tzh_ttisgmtcnt);
1305         DO(tzh_ttisstdcnt);
1306         DO(tzh_leapcnt);
1307         DO(tzh_timecnt);
1308         DO(tzh_typecnt);
1309         DO(tzh_charcnt);
1310 #undef DO
1311         for (i = 0; i < timecnt; ++i) {
1312                 j = leapcnt;
1313                 while (--j >= 0)
1314                         if (ats[i] >= trans[j]) {
1315                                 ats[i] = tadd(ats[i], corr[j]);
1316                                 break;
1317                         }
1318                 puttzcode((long) ats[i], fp);
1319         }
1320         if (timecnt > 0)
1321                 (void) fwrite((void *) types, (size_t) sizeof types[0],
1322                         (size_t) timecnt, fp);
1323         for (i = 0; i < typecnt; ++i) {
1324                 puttzcode((long) gmtoffs[i], fp);
1325                 (void) putc(isdsts[i], fp);
1326                 (void) putc(abbrinds[i], fp);
1327         }
1328         if (charcnt != 0)
1329                 (void) fwrite((void *) chars, (size_t) sizeof chars[0],
1330                         (size_t) charcnt, fp);
1331         for (i = 0; i < leapcnt; ++i) {
1332                 if (roll[i]) {
1333                         if (timecnt == 0 || trans[i] < ats[0]) {
1334                                 j = 0;
1335                                 while (isdsts[j])
1336                                         if (++j >= typecnt) {
1337                                                 j = 0;
1338                                                 break;
1339                                         }
1340                         } else {
1341                                 j = 1;
1342                                 while (j < timecnt && trans[i] >= ats[j])
1343                                         ++j;
1344                                 j = types[j - 1];
1345                         }
1346                         puttzcode((long) tadd(trans[i], -gmtoffs[j]), fp);
1347                 } else  puttzcode((long) trans[i], fp);
1348                 puttzcode((long) corr[i], fp);
1349         }
1350         for (i = 0; i < typecnt; ++i)
1351                 (void) putc(ttisstds[i], fp);
1352         for (i = 0; i < typecnt; ++i)
1353                 (void) putc(ttisgmts[i], fp);
1354         if (ferror(fp) || fclose(fp)) {
1355                 (void) fprintf(stderr, "%s: Write error on ", progname);
1356                 (void) perror(fullname);
1357                 (void) exit(EXIT_FAILURE);
1358         }
1359 }
1360
1361 static void
1362 doabbr(abbr, format, letters, isdst)
1363 char * const            abbr;
1364 const char * const      format;
1365 const char * const      letters;
1366 const int               isdst;
1367 {
1368         if (strchr(format, '/') == NULL) {
1369                 if (letters == NULL)
1370                         (void) strcpy(abbr, format);
1371                 else    (void) sprintf(abbr, format, letters);
1372         } else if (isdst)
1373                 (void) strcpy(abbr, strchr(format, '/') + 1);
1374         else {
1375                 (void) strcpy(abbr, format);
1376                 *strchr(abbr, '/') = '\0';
1377         }
1378 }
1379
1380 static void
1381 outzone(zpfirst, zonecount)
1382 const struct zone * const       zpfirst;
1383 const int                       zonecount;
1384 {
1385         register const struct zone *    zp;
1386         register struct rule *          rp;
1387         register int                    i, j;
1388         register int                    usestart, useuntil;
1389         register time_t                 starttime, untiltime;
1390         register long                   gmtoff;
1391         register long                   stdoff;
1392         register int                    year;
1393         register long                   startoff;
1394         register int                    startisdst;
1395         register int                    startttisstd;
1396         register int                    startttisgmt;
1397         register int                    type;
1398         char                            startbuf[BUFSIZ];
1399
1400         INITIALIZE(untiltime);
1401         INITIALIZE(starttime);
1402         INITIALIZE(startoff);
1403         /*
1404         ** Now. . .finally. . .generate some useful data!
1405         */
1406         timecnt = 0;
1407         typecnt = 0;
1408         charcnt = 0;
1409         /*
1410         ** A guess that may well be corrected later.
1411         */
1412         stdoff = 0;
1413         /*
1414         ** Thanks to Earl Chew (earl@dnd.icp.nec.com.au)
1415         ** for noting the need to unconditionally initialize startttisstd.
1416         */
1417         startttisstd = FALSE;
1418         startttisgmt = FALSE;
1419         for (i = 0; i < zonecount; ++i) {
1420                 zp = &zpfirst[i];
1421                 usestart = i > 0 && (zp - 1)->z_untiltime > min_time;
1422                 useuntil = i < (zonecount - 1);
1423                 if (useuntil && zp->z_untiltime <= min_time)
1424                         continue;
1425                 gmtoff = zp->z_gmtoff;
1426                 eat(zp->z_filename, zp->z_linenum);
1427                 startisdst = -1;
1428                 if (zp->z_nrules == 0) {
1429                         stdoff = zp->z_stdoff;
1430                         doabbr(startbuf, zp->z_format,
1431                                 (char *) NULL, stdoff != 0);
1432                         type = addtype(oadd(zp->z_gmtoff, stdoff),
1433                                 startbuf, stdoff != 0, startttisstd,
1434                                 startttisgmt);
1435                         if (usestart)
1436                                 addtt(starttime, type);
1437                         else if (stdoff != 0)
1438                                 addtt(min_time, type);
1439                 } else for (year = min_year; year <= max_year; ++year) {
1440                         if (useuntil && year > zp->z_untilrule.r_hiyear)
1441                                 break;
1442                         /*
1443                         ** Mark which rules to do in the current year.
1444                         ** For those to do, calculate rpytime(rp, year);
1445                         */
1446                         for (j = 0; j < zp->z_nrules; ++j) {
1447                                 rp = &zp->z_rules[j];
1448                                 eats(zp->z_filename, zp->z_linenum,
1449                                         rp->r_filename, rp->r_linenum);
1450                                 rp->r_todo = year >= rp->r_loyear &&
1451                                                 year <= rp->r_hiyear &&
1452                                                 yearistype(year, rp->r_yrtype);
1453                                 if (rp->r_todo)
1454                                         rp->r_temp = rpytime(rp, year);
1455                         }
1456                         for ( ; ; ) {
1457                                 register int    k;
1458                                 register time_t jtime, ktime;
1459                                 register long   offset;
1460                                 char            buf[BUFSIZ];
1461
1462                                 INITIALIZE(ktime);
1463                                 if (useuntil) {
1464                                         /*
1465                                         ** Turn untiltime into GMT
1466                                         ** assuming the current gmtoff and
1467                                         ** stdoff values.
1468                                         */
1469                                         untiltime = zp->z_untiltime;
1470                                         if (!zp->z_untilrule.r_todisgmt)
1471                                                 untiltime = tadd(untiltime,
1472                                                         -gmtoff);
1473                                         if (!zp->z_untilrule.r_todisstd)
1474                                                 untiltime = tadd(untiltime,
1475                                                         -stdoff);
1476                                 }
1477                                 /*
1478                                 ** Find the rule (of those to do, if any)
1479                                 ** that takes effect earliest in the year.
1480                                 */
1481                                 k = -1;
1482                                 for (j = 0; j < zp->z_nrules; ++j) {
1483                                         rp = &zp->z_rules[j];
1484                                         if (!rp->r_todo)
1485                                                 continue;
1486                                         eats(zp->z_filename, zp->z_linenum,
1487                                                 rp->r_filename, rp->r_linenum);
1488                                         offset = rp->r_todisgmt ? 0 : gmtoff;
1489                                         if (!rp->r_todisstd)
1490                                                 offset = oadd(offset, stdoff);
1491                                         jtime = rp->r_temp;
1492                                         if (jtime == min_time ||
1493                                                 jtime == max_time)
1494                                                         continue;
1495                                         jtime = tadd(jtime, -offset);
1496                                         if (k < 0 || jtime < ktime) {
1497                                                 k = j;
1498                                                 ktime = jtime;
1499                                         }
1500                                 }
1501                                 if (k < 0)
1502                                         break;  /* go on to next year */
1503                                 rp = &zp->z_rules[k];
1504                                 rp->r_todo = FALSE;
1505                                 if (useuntil && ktime >= untiltime)
1506                                         break;
1507                                 if (usestart) {
1508                                     if (ktime < starttime) {
1509                                         stdoff = rp->r_stdoff;
1510                                         startoff = oadd(zp->z_gmtoff,
1511                                                 rp->r_stdoff);
1512                                         doabbr(startbuf, zp->z_format,
1513                                                 rp->r_abbrvar,
1514                                                 rp->r_stdoff != 0);
1515                                         startisdst = rp->r_stdoff != 0;
1516                                         continue;
1517                                     }
1518                                     usestart = FALSE;
1519                                     if (ktime != starttime) {
1520                                         if (startisdst < 0 &&
1521                                             zp->z_gmtoff !=
1522                                             (zp - 1)->z_gmtoff) {
1523                                                 type = (timecnt == 0) ? 0 :
1524                                                         types[timecnt - 1];
1525                                                 startoff = oadd(gmtoffs[type],
1526                                                         -(zp - 1)->z_gmtoff);
1527                                                 startisdst = startoff != 0;
1528                                                 startoff = oadd(startoff,
1529                                                         zp->z_gmtoff);
1530                                                 (void) strcpy(startbuf,
1531                                                     &chars[abbrinds[type]]);
1532                                         }
1533                                         if (startisdst >= 0)
1534 addtt(starttime, addtype(startoff, startbuf, startisdst, startttisstd,
1535         startttisgmt));
1536                                     }
1537                                 }
1538                                 eats(zp->z_filename, zp->z_linenum,
1539                                         rp->r_filename, rp->r_linenum);
1540                                 doabbr(buf, zp->z_format, rp->r_abbrvar,
1541                                         rp->r_stdoff != 0);
1542                                 offset = oadd(zp->z_gmtoff, rp->r_stdoff);
1543                                 type = addtype(offset, buf, rp->r_stdoff != 0,
1544                                         rp->r_todisstd, rp->r_todisgmt);
1545                                 addtt(ktime, type);
1546                                 stdoff = rp->r_stdoff;
1547                         }
1548                 }
1549                 /*
1550                 ** Now we may get to set starttime for the next zone line.
1551                 */
1552                 if (useuntil) {
1553                         starttime = tadd(zp->z_untiltime, -gmtoff);
1554                         startttisstd = zp->z_untilrule.r_todisstd;
1555                         startttisgmt = zp->z_untilrule.r_todisgmt;
1556                         if (!startttisstd)
1557                                 starttime = tadd(starttime, -stdoff);
1558                 }
1559         }
1560         writezone(zpfirst->z_name);
1561 }
1562
1563 static void
1564 addtt(starttime, type)
1565 const time_t    starttime;
1566 const int       type;
1567 {
1568         if (timecnt != 0 && type == types[timecnt - 1])
1569                 return; /* easy enough! */
1570         if (timecnt == 0 && type == 0 && isdsts[0] == 0)
1571                 return; /* handled by default rule */
1572         if (timecnt >= TZ_MAX_TIMES) {
1573                 error("too many transitions?!");
1574                 (void) exit(EXIT_FAILURE);
1575         }
1576         ats[timecnt] = starttime;
1577         types[timecnt] = type;
1578         ++timecnt;
1579 }
1580
1581 static int
1582 addtype(gmtoff, abbr, isdst, ttisstd, ttisgmt)
1583 const long              gmtoff;
1584 const char * const      abbr;
1585 const int               isdst;
1586 const int               ttisstd;
1587 const int               ttisgmt;
1588 {
1589         register int    i, j;
1590
1591         /*
1592         ** See if there's already an entry for this zone type.
1593         ** If so, just return its index.
1594         */
1595         for (i = 0; i < typecnt; ++i) {
1596                 if (gmtoff == gmtoffs[i] && isdst == isdsts[i] &&
1597                         strcmp(abbr, &chars[abbrinds[i]]) == 0 &&
1598                         ttisstd == ttisstds[i] &&
1599                         ttisgmt == ttisgmts[i])
1600                                 return i;
1601         }
1602         /*
1603         ** There isn't one; add a new one, unless there are already too
1604         ** many.
1605         */
1606         if (typecnt >= TZ_MAX_TYPES) {
1607                 error("too many local time types");
1608                 (void) exit(EXIT_FAILURE);
1609         }
1610         gmtoffs[i] = gmtoff;
1611         isdsts[i] = isdst;
1612         ttisstds[i] = ttisstd;
1613         ttisgmts[i] = ttisgmt;
1614
1615         for (j = 0; j < charcnt; ++j)
1616                 if (strcmp(&chars[j], abbr) == 0)
1617                         break;
1618         if (j == charcnt)
1619                 newabbr(abbr);
1620         abbrinds[i] = j;
1621         ++typecnt;
1622         return i;
1623 }
1624
1625 static void
1626 leapadd(t, positive, rolling, count)
1627 const time_t    t;
1628 const int       positive;
1629 const int       rolling;
1630 int             count;
1631 {
1632         register int    i, j;
1633
1634         if (leapcnt + (positive ? count : 1) > TZ_MAX_LEAPS) {
1635                 error("too many leap seconds");
1636                 (void) exit(EXIT_FAILURE);
1637         }
1638         for (i = 0; i < leapcnt; ++i)
1639                 if (t <= trans[i]) {
1640                         if (t == trans[i]) {
1641                                 error("repeated leap second moment");
1642                                 (void) exit(EXIT_FAILURE);
1643                         }
1644                         break;
1645                 }
1646         do {
1647                 for (j = leapcnt; j > i; --j) {
1648                         trans[j] = trans[j - 1];
1649                         corr[j] = corr[j - 1];
1650                         roll[j] = roll[j - 1];
1651                 }
1652                 trans[i] = t;
1653                 corr[i] = positive ? 1L : eitol(-count);
1654                 roll[i] = rolling;
1655                 ++leapcnt;
1656         } while (positive && --count != 0);
1657 }
1658
1659 static void
1660 adjleap P((void))
1661 {
1662         register int    i;
1663         register long   last = 0;
1664
1665         /*
1666         ** propagate leap seconds forward
1667         */
1668         for (i = 0; i < leapcnt; ++i) {
1669                 trans[i] = tadd(trans[i], last);
1670                 last = corr[i] += last;
1671         }
1672 }
1673
1674 static int
1675 yearistype(year, type)
1676 const int               year;
1677 const char * const      type;
1678 {
1679         static char *   buf;
1680         int             result;
1681
1682         if (type == NULL || *type == '\0')
1683                 return TRUE;
1684         buf = erealloc(buf, (int) (132 + strlen(yitcommand) + strlen(type)));
1685         (void) sprintf(buf, "%s %d %s", yitcommand, year, type);
1686         result = system(buf);
1687         if (result == 0)
1688                 return TRUE;
1689         if (result == (1 << 8))
1690                 return FALSE;
1691         error("Wild result from command execution");
1692         (void) fprintf(stderr, "%s: command was '%s', result was %d\n",
1693                 progname, buf, result);
1694         for ( ; ; )
1695                 (void) exit(EXIT_FAILURE);
1696 }
1697
1698 static int
1699 lowerit(a)
1700 const int       a;
1701 {
1702         return (isascii(a) && isupper(a)) ? tolower(a) : a;
1703 }
1704
1705 static int
1706 ciequal(ap, bp)         /* case-insensitive equality */
1707 register const char *   ap;
1708 register const char *   bp;
1709 {
1710         while (lowerit(*ap) == lowerit(*bp++))
1711                 if (*ap++ == '\0')
1712                         return TRUE;
1713         return FALSE;
1714 }
1715
1716 static int
1717 itsabbr(abbr, word)
1718 register const char *   abbr;
1719 register const char *   word;
1720 {
1721         if (lowerit(*abbr) != lowerit(*word))
1722                 return FALSE;
1723         ++word;
1724         while (*++abbr != '\0')
1725                 do if (*word == '\0')
1726                         return FALSE;
1727                                 while (lowerit(*word++) != lowerit(*abbr));
1728         return TRUE;
1729 }
1730
1731 static const struct lookup *
1732 byword(word, table)
1733 register const char * const             word;
1734 register const struct lookup * const    table;
1735 {
1736         register const struct lookup *  foundlp;
1737         register const struct lookup *  lp;
1738
1739         if (word == NULL || table == NULL)
1740                 return NULL;
1741         /*
1742         ** Look for exact match.
1743         */
1744         for (lp = table; lp->l_word != NULL; ++lp)
1745                 if (ciequal(word, lp->l_word))
1746                         return lp;
1747         /*
1748         ** Look for inexact match.
1749         */
1750         foundlp = NULL;
1751         for (lp = table; lp->l_word != NULL; ++lp)
1752                 if (itsabbr(word, lp->l_word))
1753                         if (foundlp == NULL)
1754                                 foundlp = lp;
1755                         else    return NULL;    /* multiple inexact matches */
1756         return foundlp;
1757 }
1758
1759 static char **
1760 getfields(cp)
1761 register char * cp;
1762 {
1763         register char *         dp;
1764         register char **        array;
1765         register int            nsubs;
1766
1767         if (cp == NULL)
1768                 return NULL;
1769         array = (char **) (void *)
1770                 emalloc((int) ((strlen(cp) + 1) * sizeof *array));
1771         nsubs = 0;
1772         for ( ; ; ) {
1773                 while (isascii(*cp) && isspace(*cp))
1774                         ++cp;
1775                 if (*cp == '\0' || *cp == '#')
1776                         break;
1777                 array[nsubs++] = dp = cp;
1778                 do {
1779                         if ((*dp = *cp++) != '"')
1780                                 ++dp;
1781                         else while ((*dp = *cp++) != '"')
1782                                 if (*dp != '\0')
1783                                         ++dp;
1784                                 else    error("Odd number of quotation marks");
1785                 } while (*cp != '\0' && *cp != '#' &&
1786                         (!isascii(*cp) || !isspace(*cp)));
1787                 if (isascii(*cp) && isspace(*cp))
1788                         ++cp;
1789                 *dp = '\0';
1790         }
1791         array[nsubs] = NULL;
1792         return array;
1793 }
1794
1795 static long
1796 oadd(t1, t2)
1797 const long      t1;
1798 const long      t2;
1799 {
1800         register long   t;
1801
1802         t = t1 + t2;
1803         if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {
1804                 error("time overflow");
1805                 (void) exit(EXIT_FAILURE);
1806         }
1807         return t;
1808 }
1809
1810 static time_t
1811 tadd(t1, t2)
1812 const time_t    t1;
1813 const long      t2;
1814 {
1815         register time_t t;
1816
1817         if (t1 == max_time && t2 > 0)
1818                 return max_time;
1819         if (t1 == min_time && t2 < 0)
1820                 return min_time;
1821         t = t1 + t2;
1822         if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {
1823                 error("time overflow");
1824                 (void) exit(EXIT_FAILURE);
1825         }
1826         return t;
1827 }
1828
1829 /*
1830 ** Given a rule, and a year, compute the date - in seconds since January 1,
1831 ** 1970, 00:00 LOCAL time - in that year that the rule refers to.
1832 */
1833
1834 static time_t
1835 rpytime(rp, wantedy)
1836 register const struct rule * const      rp;
1837 register const int                      wantedy;
1838 {
1839         register int    y, m, i;
1840         register long   dayoff;                 /* with a nod to Margaret O. */
1841         register time_t t;
1842
1843         if (wantedy == min_int)
1844                 return min_time;
1845         if (wantedy == max_int)
1846                 return max_time;
1847         dayoff = 0;
1848         m = TM_JANUARY;
1849         y = EPOCH_YEAR;
1850         while (wantedy != y) {
1851                 if (wantedy > y) {
1852                         i = len_years[isleap(y)];
1853                         ++y;
1854                 } else {
1855                         --y;
1856                         i = -len_years[isleap(y)];
1857                 }
1858                 dayoff = oadd(dayoff, eitol(i));
1859         }
1860         while (m != rp->r_month) {
1861                 i = len_months[isleap(y)][m];
1862                 dayoff = oadd(dayoff, eitol(i));
1863                 ++m;
1864         }
1865         i = rp->r_dayofmonth;
1866         if (m == TM_FEBRUARY && i == 29 && !isleap(y)) {
1867                 if (rp->r_dycode == DC_DOWLEQ)
1868                         --i;
1869                 else {
1870                         error("use of 2/29 in non leap-year");
1871                         (void) exit(EXIT_FAILURE);
1872                 }
1873         }
1874         --i;
1875         dayoff = oadd(dayoff, eitol(i));
1876         if (rp->r_dycode == DC_DOWGEQ || rp->r_dycode == DC_DOWLEQ) {
1877                 register long   wday;
1878
1879 #define LDAYSPERWEEK    ((long) DAYSPERWEEK)
1880                 wday = eitol(EPOCH_WDAY);
1881                 /*
1882                 ** Don't trust mod of negative numbers.
1883                 */
1884                 if (dayoff >= 0)
1885                         wday = (wday + dayoff) % LDAYSPERWEEK;
1886                 else {
1887                         wday -= ((-dayoff) % LDAYSPERWEEK);
1888                         if (wday < 0)
1889                                 wday += LDAYSPERWEEK;
1890                 }
1891                 while (wday != eitol(rp->r_wday))
1892                         if (rp->r_dycode == DC_DOWGEQ) {
1893                                 dayoff = oadd(dayoff, (long) 1);
1894                                 if (++wday >= LDAYSPERWEEK)
1895                                         wday = 0;
1896                                 ++i;
1897                         } else {
1898                                 dayoff = oadd(dayoff, (long) -1);
1899                                 if (--wday < 0)
1900                                         wday = LDAYSPERWEEK - 1;
1901                                 --i;
1902                         }
1903                 if (i < 0 || i >= len_months[isleap(y)][m]) {
1904                         error("no day in month matches rule");
1905                         (void) exit(EXIT_FAILURE);
1906                 }
1907         }
1908         if (dayoff < 0 && !tt_signed)
1909                 return min_time;
1910         t = (time_t) dayoff * SECSPERDAY;
1911         /*
1912         ** Cheap overflow check.
1913         */
1914         if (t / SECSPERDAY != dayoff)
1915                 return (dayoff > 0) ? max_time : min_time;
1916         return tadd(t, rp->r_tod);
1917 }
1918
1919 static void
1920 newabbr(string)
1921 const char * const      string;
1922 {
1923         register int    i;
1924
1925         i = strlen(string) + 1;
1926         if (charcnt + i > TZ_MAX_CHARS) {
1927                 error("too many, or too long, time zone abbreviations");
1928                 (void) exit(EXIT_FAILURE);
1929         }
1930         (void) strcpy(&chars[charcnt], string);
1931         charcnt += eitol(i);
1932 }
1933
1934 static int
1935 mkdirs(argname)
1936 char * const    argname;
1937 {
1938         register char * name;
1939         register char * cp;
1940
1941         if (argname == NULL || *argname == '\0')
1942                 return 0;
1943         cp = name = ecpyalloc(argname);
1944         while ((cp = strchr(cp + 1, '/')) != 0) {
1945                 *cp = '\0';
1946 #ifndef unix
1947                 /*
1948                 ** DOS drive specifier?
1949                 */
1950                 if (strlen(name) == 2 && isascii(name[0]) &&
1951                         isalpha(name[0]) && name[1] == ':') {
1952                                 *cp = '/';
1953                                 continue;
1954                 }
1955 #endif /* !defined unix */
1956                 if (!itsdir(name)) {
1957                         /*
1958                         ** It doesn't seem to exist, so we try to create it.
1959                         */
1960                         if (mkdir(name, 0755) != 0) {
1961                                 (void) fprintf(stderr,
1962                                         "%s: Can't create directory ",
1963                                         progname);
1964                                 (void) perror(name);
1965                                 ifree(name);
1966                                 return -1;
1967                         }
1968                 }
1969                 *cp = '/';
1970         }
1971         ifree(name);
1972         return 0;
1973 }
1974
1975 static long
1976 eitol(i)
1977 const int       i;
1978 {
1979         long    l;
1980
1981         l = i;
1982         if ((i < 0 && l >= 0) || (i == 0 && l != 0) || (i > 0 && l <= 0)) {
1983                 (void) fprintf(stderr,
1984                         "%s: %d did not sign extend correctly\n",
1985                         progname, i);
1986                 (void) exit(EXIT_FAILURE);
1987         }
1988         return l;
1989 }
1990
1991 /*
1992 ** UNIX was a registered trademark of UNIX System Laboratories in 1993.
1993 */