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Sourcecode: postgresql-8.4 version File versions

zic.c

/*
 * This file is in the public domain, so clarified as of
 * 2006-07-17 by Arthur David Olson.
 *
 * IDENTIFICATION
 *      $PostgreSQL: pgsql/src/timezone/zic.c,v 1.24 2009/06/11 14:49:15 momjian Exp $
 */

#include "postgres_fe.h"

#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif
#include <limits.h>
#include <locale.h>

extern int  optind;
extern char *optarg;

#include "private.h"
#include "pgtz.h"
#include "tzfile.h"

#define             ZIC_VERSION       '2'

typedef int64 zic_t;

#ifndef ZIC_MAX_ABBR_LEN_WO_WARN
#define ZIC_MAX_ABBR_LEN_WO_WARN      6
#endif   /* !defined ZIC_MAX_ABBR_LEN_WO_WARN */

#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif

#ifndef WIN32
#ifdef S_IRUSR
#define MKDIR_UMASK (S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH)
#else
#define MKDIR_UMASK 0755
#endif
#endif

static char elsieid[] = "@(#)zic.c  8.17";

/*
 * On some ancient hosts, predicates like `isspace(C)' are defined
 * only if isascii(C) || C == EOF. Modern hosts obey the C Standard,
 * which says they are defined only if C == ((unsigned char) C) || C == EOF.
 * Neither the C Standard nor Posix require that `isascii' exist.
 * For portability, we check both ancient and modern requirements.
 * If isascii is not defined, the isascii check succeeds trivially.
 */
#include <ctype.h>
#ifndef isascii
#define isascii(x) 1
#endif

#define OFFSET_STRLEN_MAXIMUM (7 + INT_STRLEN_MAXIMUM(long))
#define RULE_STRLEN_MAXIMUM   8 /* "Mdd.dd.d" */

#define end(cp)           (strchr((cp), '\0'))

struct rule
{
      const char *r_filename;
      int               r_linenum;
      const char *r_name;

      int               r_loyear;         /* for example, 1986 */
      int               r_hiyear;         /* for example, 1986 */
      const char *r_yrtype;
      int               r_lowasnum;
      int               r_hiwasnum;

      int               r_month;          /* 0..11 */

      int               r_dycode;         /* see below */
      int               r_dayofmonth;
      int               r_wday;

      long        r_tod;                  /* time from midnight */
      int               r_todisstd;       /* above is standard time if TRUE */
      /* or wall clock time if FALSE */
      int               r_todisgmt;       /* above is GMT if TRUE */
      /* or local time if FALSE */
      long        r_stdoff;         /* offset from standard time */
      const char *r_abbrvar;        /* variable part of abbreviation */

      int               r_todo;                 /* a rule to do (used in outzone) */
      zic_t       r_temp;                 /* used in outzone */
};

/*
 *    r_dycode          r_dayofmonth      r_wday
 */

#define DC_DOM          0     /* 1..31 */       /* unused */
#define DC_DOWGEQ 1     /* 1..31 */       /* 0..6 (Sun..Sat) */
#define DC_DOWLEQ 2     /* 1..31 */       /* 0..6 (Sun..Sat) */

struct zone
{
      const char *z_filename;
      int               z_linenum;

      const char *z_name;
      long        z_gmtoff;
      const char *z_rule;
      const char *z_format;

      long        z_stdoff;

      struct rule *z_rules;
      int               z_nrules;

      struct rule z_untilrule;
      zic_t       z_untiltime;
};

extern int  link(const char *fromname, const char *toname);
static void addtt(const pg_time_t starttime, int type);
static int addtype(long gmtoff, const char *abbr, int isdst,
            int ttisstd, int ttisgmt);
static void leapadd(const pg_time_t t, int positive, int rolling, int count);
static void adjleap(void);
static void associate(void);
static int  ciequal(const char *ap, const char *bp);
static void convert(long val, char *buf);
static void dolink(const char *fromfile, const char *tofile);
static void doabbr(char *abbr, const char *format,
         const char *letters, int isdst, int doquotes);
static void eat(const char *name, int num);
static void eats(const char *name, int num,
       const char *rname, int rnum);
static long eitol(int i);
static void error(const char *message);
static char **getfields(char *buf);
static long gethms(const char *string, const char *errstrng,
         int signable);
static void infile(const char *filename);
static void inleap(char **fields, int nfields);
static void inlink(char **fields, int nfields);
static void inrule(char **fields, int nfields);
static int  inzcont(char **fields, int nfields);
static int  inzone(char **fields, int nfields);
static int  inzsub(char **fields, int nfields, int iscont);
static int  itsabbr(const char *abbr, const char *word);
static int  itsdir(const char *name);
static int  lowerit(int c);
static char *memcheck(char *tocheck);
static int  mkdirs(char *filename);
static void newabbr(const char *abbr);
static long oadd(long t1, long t2);
static void outzone(const struct zone * zp, int ntzones);
static void puttzcode(long code, FILE *fp);
static int  rcomp(const void *leftp, const void *rightp);
static pg_time_t rpytime(const struct rule * rp, int wantedy);
static void rulesub(struct rule * rp,
            const char *loyearp, const char *hiyearp,
            const char *typep, const char *monthp,
            const char *dayp, const char *timep);
static void setboundaries(void);
static pg_time_t tadd(const pg_time_t t1, long t2);
static void usage(void);
static void writezone(const char *name, const char *string);
static int  yearistype(int year, const char *type);

static int  charcnt;
static int  errors;
static const char *filename;
static int  leapcnt;
static int  leapseen;
static int  leapminyear;
static int  leapmaxyear;
static int  linenum;
static int  max_abbrvar_len;
static int  max_format_len;
static zic_t max_time;
static int  max_year;
static zic_t min_time;
static int  min_year;
static int  noise;
static const char *rfilename;
static int  rlinenum;
static const char *progname;
static int  timecnt;
static int  typecnt;

/*
 * Line codes.
 */

#define LC_RULE         0
#define LC_ZONE         1
#define LC_LINK         2
#define LC_LEAP         3

/*
 * Which fields are which on a Zone line.
 */

#define ZF_NAME         1
#define ZF_GMTOFF 2
#define ZF_RULE         3
#define ZF_FORMAT 4
#define ZF_TILYEAR      5
#define ZF_TILMONTH 6
#define ZF_TILDAY 7
#define ZF_TILTIME      8
#define ZONE_MINFIELDS  5
#define ZONE_MAXFIELDS  9

/*
 * Which fields are which on a Zone continuation line.
 */

#define ZFC_GMTOFF      0
#define ZFC_RULE  1
#define ZFC_FORMAT      2
#define ZFC_TILYEAR 3
#define ZFC_TILMONTH    4
#define ZFC_TILDAY      5
#define ZFC_TILTIME 6
#define ZONEC_MINFIELDS 3
#define ZONEC_MAXFIELDS 7

/*
 * Which files are which on a Rule line.
 */

#define RF_NAME         1
#define RF_LOYEAR 2
#define RF_HIYEAR 3
#define RF_COMMAND      4
#define RF_MONTH  5
#define RF_DAY          6
#define RF_TOD          7
#define RF_STDOFF 8
#define RF_ABBRVAR      9
#define RULE_FIELDS 10

/*
 * Which fields are which on a Link line.
 */

#define LF_FROM         1
#define LF_TO           2
#define LINK_FIELDS 3

/*
 * Which fields are which on a Leap line.
 */

#define LP_YEAR         1
#define LP_MONTH  2
#define LP_DAY          3
#define LP_TIME         4
#define LP_CORR         5
#define LP_ROLL         6
#define LEAP_FIELDS 7

/*
 * Year synonyms.
 */

#define YR_MINIMUM      0
#define YR_MAXIMUM      1
#define YR_ONLY         2

static struct rule *rules;
static int  nrules;                       /* number of rules */

static struct zone *zones;
static int  nzones;                       /* number of zones */

struct link
{
      const char *l_filename;
      int               l_linenum;
      const char *l_from;
      const char *l_to;
};

static struct link *links;
static int  nlinks;

struct lookup
{
      const char *l_word;
      const int   l_value;
};

static struct lookup const *byword(const char *string,
         const struct lookup * lp);

static struct lookup const line_codes[] = {
      {"Rule", LC_RULE},
      {"Zone", LC_ZONE},
      {"Link", LC_LINK},
      {"Leap", LC_LEAP},
      {NULL, 0}
};

static struct lookup const mon_names[] = {
      {"January", TM_JANUARY},
      {"February", TM_FEBRUARY},
      {"March", TM_MARCH},
      {"April", TM_APRIL},
      {"May", TM_MAY},
      {"June", TM_JUNE},
      {"July", TM_JULY},
      {"August", TM_AUGUST},
      {"September", TM_SEPTEMBER},
      {"October", TM_OCTOBER},
      {"November", TM_NOVEMBER},
      {"December", TM_DECEMBER},
      {NULL, 0}
};

static struct lookup const wday_names[] = {
      {"Sunday", TM_SUNDAY},
      {"Monday", TM_MONDAY},
      {"Tuesday", TM_TUESDAY},
      {"Wednesday", TM_WEDNESDAY},
      {"Thursday", TM_THURSDAY},
      {"Friday", TM_FRIDAY},
      {"Saturday", TM_SATURDAY},
      {NULL, 0}
};

static struct lookup const lasts[] = {
      {"last-Sunday", TM_SUNDAY},
      {"last-Monday", TM_MONDAY},
      {"last-Tuesday", TM_TUESDAY},
      {"last-Wednesday", TM_WEDNESDAY},
      {"last-Thursday", TM_THURSDAY},
      {"last-Friday", TM_FRIDAY},
      {"last-Saturday", TM_SATURDAY},
      {NULL, 0}
};

static struct lookup const begin_years[] = {
      {"minimum", YR_MINIMUM},
      {"maximum", YR_MAXIMUM},
      {NULL, 0}
};

static struct lookup const end_years[] = {
      {"minimum", YR_MINIMUM},
      {"maximum", YR_MAXIMUM},
      {"only", YR_ONLY},
      {NULL, 0}
};

static struct lookup const leap_types[] = {
      {"Rolling", TRUE},
      {"Stationary", FALSE},
      {NULL, 0}
};

static const int len_months[2][MONSPERYEAR] = {
      {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
      {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
};

static const int len_years[2] = {
      DAYSPERNYEAR, DAYSPERLYEAR
};

static struct attype
{
      zic_t       at;
      unsigned char type;
}     attypes[TZ_MAX_TIMES];
static long gmtoffs[TZ_MAX_TYPES];
static char isdsts[TZ_MAX_TYPES];
static unsigned char abbrinds[TZ_MAX_TYPES];
static char ttisstds[TZ_MAX_TYPES];
static char ttisgmts[TZ_MAX_TYPES];
static char chars[TZ_MAX_CHARS];
static zic_t trans[TZ_MAX_LEAPS];
static long corr[TZ_MAX_LEAPS];
static char roll[TZ_MAX_LEAPS];

/*
 * Memory allocation.
 */

static char *
memcheck(char *ptr)
{
      if (ptr == NULL)
      {
            const char *e = strerror(errno);

            (void) fprintf(stderr, _("%s: Memory exhausted: %s\n"),
                                 progname, e);
            exit(EXIT_FAILURE);
      }
      return ptr;
}

#define emalloc(size)         memcheck(imalloc(size))
#define erealloc(ptr, size) memcheck(irealloc((ptr), (size)))
#define ecpyalloc(ptr)        memcheck(icpyalloc(ptr))
#define ecatalloc(oldp, newp) memcheck(icatalloc((oldp), (newp)))

/*
 * Error handling.
 */

static void
eats(const char *name, int num, const char *rname, int rnum)
{
      filename = name;
      linenum = num;
      rfilename = rname;
      rlinenum = rnum;
}

static void
eat(const char *name, int num)
{
      eats(name, num, (char *) NULL, -1);
}

static void
error(const char *string)
{
      /*
       * Match the format of "cc" to allow sh users to  zic ... 2>&1 | error -t
       * "*" -v on BSD systems.
       */
      (void) fprintf(stderr, _("\"%s\", line %d: %s"),
                           filename, linenum, string);
      if (rfilename != NULL)
            (void) fprintf(stderr, _(" (rule from \"%s\", line %d)"),
                                 rfilename, rlinenum);
      (void) fprintf(stderr, "\n");
      ++errors;
}

static void
warning(const char *string)
{
      char     *cp;

      cp = ecpyalloc(_("warning: "));
      cp = ecatalloc(cp, string);
      error(cp);
      ifree(cp);
      --errors;
}

static void
usage(void)
{
      (void) fprintf(stderr, _("%s: usage is %s \
[ --version ] [ -v ] [ -l localtime ] [ -p posixrules ] \\\n\
\t[ -d directory ] [ -L leapseconds ] [ -y yearistype ] [ filename ... ]\n"),
                           progname, progname);
      exit(EXIT_FAILURE);
}

static const char *psxrules;
static const char *lcltime;
static const char *directory;
static const char *leapsec;
static const char *yitcommand;

int
main(int argc, char *argv[])
{
      int               i;
      int               j;
      int               c;

#ifndef WIN32
      (void) umask(umask(S_IWGRP | S_IWOTH) | (S_IWGRP | S_IWOTH));
#endif   /* !WIN32 */
      progname = argv[0];
      if (TYPE_BIT(zic_t) < 64)
      {
            (void) fprintf(stderr, "%s: %s\n", progname,
                                 _("wild compilation-time specification of zic_t"));
            exit(EXIT_FAILURE);
      }
      for (i = 1; i < argc; ++i)
            if (strcmp(argv[i], "--version") == 0)
            {
                  (void) printf("%s\n", elsieid);
                  exit(EXIT_SUCCESS);
            }
      while ((c = getopt(argc, argv, "d:l:p:L:vsy:")) != EOF && c != -1)
            switch (c)
            {
                  default:
                        usage();
                  case 'd':
                        if (directory == NULL)
                              directory = optarg;
                        else
                        {
                              (void) fprintf(stderr,
                                                _("%s: More than one -d option specified\n"),
                                                   progname);
                              exit(EXIT_FAILURE);
                        }
                        break;
                  case 'l':
                        if (lcltime == NULL)
                              lcltime = optarg;
                        else
                        {
                              (void) fprintf(stderr,
                                                _("%s: More than one -l option specified\n"),
                                                   progname);
                              exit(EXIT_FAILURE);
                        }
                        break;
                  case 'p':
                        if (psxrules == NULL)
                              psxrules = optarg;
                        else
                        {
                              (void) fprintf(stderr,
                                                _("%s: More than one -p option specified\n"),
                                                   progname);
                              exit(EXIT_FAILURE);
                        }
                        break;
                  case 'y':
                        if (yitcommand == NULL)
                              yitcommand = optarg;
                        else
                        {
                              (void) fprintf(stderr,
                                                _("%s: More than one -y option specified\n"),
                                                   progname);
                              exit(EXIT_FAILURE);
                        }
                        break;
                  case 'L':
                        if (leapsec == NULL)
                              leapsec = optarg;
                        else
                        {
                              (void) fprintf(stderr,
                                                _("%s: More than one -L option specified\n"),
                                                   progname);
                              exit(EXIT_FAILURE);
                        }
                        break;
                  case 'v':
                        noise = TRUE;
                        break;
                  case 's':
                        (void) printf("%s: -s ignored\n", progname);
                        break;
            }
      if (optind == argc - 1 && strcmp(argv[optind], "=") == 0)
            usage();                      /* usage message by request */
      if (directory == NULL)
            directory = "data";
      if (yitcommand == NULL)
            yitcommand = "yearistype";

      setboundaries();

      if (optind < argc && leapsec != NULL)
      {
            infile(leapsec);
            adjleap();
      }

      for (i = optind; i < argc; ++i)
            infile(argv[i]);
      if (errors)
            exit(EXIT_FAILURE);
      associate();
      for (i = 0; i < nzones; i = j)
      {
            /*
             * Find the next non-continuation zone entry.
             */
            for (j = i + 1; j < nzones && zones[j].z_name == NULL; ++j)
                  continue;
            outzone(&zones[i], j - i);
      }

      /*
       * Make links.
       */
      for (i = 0; i < nlinks; ++i)
      {
            eat(links[i].l_filename, links[i].l_linenum);
            dolink(links[i].l_from, links[i].l_to);
            if (noise)
                  for (j = 0; j < nlinks; ++j)
                        if (strcmp(links[i].l_to,
                                       links[j].l_from) == 0)
                              warning(_("link to link"));
      }
      if (lcltime != NULL)
      {
            eat("command line", 1);
            dolink(lcltime, TZDEFAULT);
      }
      if (psxrules != NULL)
      {
            eat("command line", 1);
            dolink(psxrules, TZDEFRULES);
      }
      return (errors == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
}

static void
dolink(const char *fromfield, const char *tofield)
{
      char     *fromname;
      char     *toname;

      if (fromfield[0] == '/')
            fromname = ecpyalloc(fromfield);
      else
      {
            fromname = ecpyalloc(directory);
            fromname = ecatalloc(fromname, "/");
            fromname = ecatalloc(fromname, fromfield);
      }
      if (tofield[0] == '/')
            toname = ecpyalloc(tofield);
      else
      {
            toname = ecpyalloc(directory);
            toname = ecatalloc(toname, "/");
            toname = ecatalloc(toname, tofield);
      }

      /*
       * We get to be careful here since there's a fair chance of root running
       * us.
       */
      if (!itsdir(toname))
            (void) remove(toname);
      if (link(fromname, toname) != 0)
      {
            int               result;

            if (mkdirs(toname) != 0)
                  exit(EXIT_FAILURE);

            result = link(fromname, toname);
#ifdef HAVE_SYMLINK
            if (result != 0 &&
                  access(fromname, F_OK) == 0 &&
                  !itsdir(fromname))
            {
                  const char *s = tofield;
                  char     *symlinkcontents = NULL;

                  while ((s = strchr(s + 1, '/')) != NULL)
                        symlinkcontents = ecatalloc(symlinkcontents, "../");
                  symlinkcontents = ecatalloc(symlinkcontents, fromfield);

                  result = symlink(symlinkcontents, toname);
                  if (result == 0)
                        warning(_("hard link failed, symbolic link used"));
                  ifree(symlinkcontents);
            }
#endif
            if (result != 0)
            {
                  const char *e = strerror(errno);

                  (void) fprintf(stderr,
                                       _("%s: Cannot link from %s to %s: %s\n"),
                                       progname, fromname, toname, e);
                  exit(EXIT_FAILURE);
            }
      }
      ifree(fromname);
      ifree(toname);
}

#define TIME_T_BITS_IN_FILE   64

static void
setboundaries(void)
{
      int               i;

      min_time = -1;
      for (i = 0; i < TIME_T_BITS_IN_FILE - 1; ++i)
            min_time *= 2;
      max_time = -(min_time + 1);
}

static int
itsdir(const char *name)
{
      char     *myname;
      int               accres;

      myname = ecpyalloc(name);
      myname = ecatalloc(myname, "/.");
      accres = access(myname, F_OK);
      ifree(myname);
      return accres == 0;
}

/*
 * Associate sets of rules with zones.
 */

/*
 * Sort by rule name.
 */

static int
rcomp(const void *cp1, const void *cp2)
{
      return strcmp(((const struct rule *) cp1)->r_name,
                          ((const struct rule *) cp2)->r_name);
}

static void
associate(void)
{
      struct zone *zp;
      struct rule *rp;
      int               base,
                        out;
      int               i,
                        j;

      if (nrules != 0)
      {
            (void) qsort((void *) rules, (size_t) nrules,
                               (size_t) sizeof *rules, rcomp);
            for (i = 0; i < nrules - 1; ++i)
            {
                  if (strcmp(rules[i].r_name,
                                 rules[i + 1].r_name) != 0)
                        continue;
                  if (strcmp(rules[i].r_filename,
                                 rules[i + 1].r_filename) == 0)
                        continue;
                  eat(rules[i].r_filename, rules[i].r_linenum);
                  warning(_("same rule name in multiple files"));
                  eat(rules[i + 1].r_filename, rules[i + 1].r_linenum);
                  warning(_("same rule name in multiple files"));
                  for (j = i + 2; j < nrules; ++j)
                  {
                        if (strcmp(rules[i].r_name,
                                       rules[j].r_name) != 0)
                              break;
                        if (strcmp(rules[i].r_filename,
                                       rules[j].r_filename) == 0)
                              continue;
                        if (strcmp(rules[i + 1].r_filename,
                                       rules[j].r_filename) == 0)
                              continue;
                        break;
                  }
                  i = j - 1;
            }
      }
      for (i = 0; i < nzones; ++i)
      {
            zp = &zones[i];
            zp->z_rules = NULL;
            zp->z_nrules = 0;
      }
      for (base = 0; base < nrules; base = out)
      {
            rp = &rules[base];
            for (out = base + 1; out < nrules; ++out)
                  if (strcmp(rp->r_name, rules[out].r_name) != 0)
                        break;
            for (i = 0; i < nzones; ++i)
            {
                  zp = &zones[i];
                  if (strcmp(zp->z_rule, rp->r_name) != 0)
                        continue;
                  zp->z_rules = rp;
                  zp->z_nrules = out - base;
            }
      }
      for (i = 0; i < nzones; ++i)
      {
            zp = &zones[i];
            if (zp->z_nrules == 0)
            {
                  /*
                   * Maybe we have a local standard time offset.
                   */
                  eat(zp->z_filename, zp->z_linenum);
                  zp->z_stdoff = gethms(zp->z_rule, _("unruly zone"),
                                                  TRUE);

                  /*
                   * Note, though, that if there's no rule, a '%s' in the format is
                   * a bad thing.
                   */
                  if (strchr(zp->z_format, '%') != 0)
                        error(_("%s in ruleless zone"));
            }
      }
      if (errors)
            exit(EXIT_FAILURE);
}

static void
infile(const char *name)
{
      FILE     *fp;
      char    **fields;
      char     *cp;
      const struct lookup *lp;
      int               nfields;
      int               wantcont;
      int               num;
      char        buf[BUFSIZ];

      if (strcmp(name, "-") == 0)
      {
            name = _("standard input");
            fp = stdin;
      }
      else if ((fp = fopen(name, "r")) == NULL)
      {
            const char *e = strerror(errno);

            (void) fprintf(stderr, _("%s: Cannot open %s: %s\n"),
                                 progname, name, e);
            exit(EXIT_FAILURE);
      }
      wantcont = FALSE;
      for (num = 1;; ++num)
      {
            eat(name, num);
            if (fgets(buf, (int) sizeof buf, fp) != buf)
                  break;
            cp = strchr(buf, '\n');
            if (cp == NULL)
            {
                  error(_("line too long"));
                  exit(EXIT_FAILURE);
            }
            *cp = '\0';
            fields = getfields(buf);
            nfields = 0;
            while (fields[nfields] != NULL)
            {
                  static char nada;

                  if (strcmp(fields[nfields], "-") == 0)
                        fields[nfields] = &nada;
                  ++nfields;
            }
            if (nfields == 0)
            {
                  /* nothing to do */
            }
            else if (wantcont)
                  wantcont = inzcont(fields, nfields);
            else
            {
                  lp = byword(fields[0], line_codes);
                  if (lp == NULL)
                        error(_("input line of unknown type"));
                  else
                        switch ((int) (lp->l_value))
                        {
                              case LC_RULE:
                                    inrule(fields, nfields);
                                    wantcont = FALSE;
                                    break;
                              case LC_ZONE:
                                    wantcont = inzone(fields, nfields);
                                    break;
                              case LC_LINK:
                                    inlink(fields, nfields);
                                    wantcont = FALSE;
                                    break;
                              case LC_LEAP:
                                    if (name != leapsec)
                                          (void) fprintf(stderr,
                                          _("%s: Leap line in non leap seconds file %s\n"),
                                                               progname, name);
                                    else
                                          inleap(fields, nfields);
                                    wantcont = FALSE;
                                    break;
                              default:    /* "cannot happen" */
                                    (void) fprintf(stderr,
                                                         _("%s: panic: Invalid l_value %d\n"),
                                                         progname, lp->l_value);
                                    exit(EXIT_FAILURE);
                        }
            }
            ifree((char *) fields);
      }
      if (ferror(fp))
      {
            (void) fprintf(stderr, _("%s: Error reading %s\n"),
                                 progname, filename);
            exit(EXIT_FAILURE);
      }
      if (fp != stdin && fclose(fp))
      {
            const char *e = strerror(errno);

            (void) fprintf(stderr, _("%s: Error closing %s: %s\n"),
                                 progname, filename, e);
            exit(EXIT_FAILURE);
      }
      if (wantcont)
            error(_("expected continuation line not found"));
}

/*----------
 * Convert a string of one of the forms
 *    h     -h    hh:mm -hh:mm      hh:mm:ss    -hh:mm:ss
 * into a number of seconds.
 * A null string maps to zero.
 * Call error with errstring and return zero on errors.
 *----------
 */
static long
gethms(const char *string, const char *errstring, int signable)
{
      long        hh;
      int               mm,
                        ss,
                        sign;

      if (string == NULL || *string == '\0')
            return 0;
      if (!signable)
            sign = 1;
      else if (*string == '-')
      {
            sign = -1;
            ++string;
      }
      else
            sign = 1;
      if (sscanf(string, scheck(string, "%ld"), &hh) == 1)
            mm = ss = 0;
      else if (sscanf(string, scheck(string, "%ld:%d"), &hh, &mm) == 2)
            ss = 0;
      else if (sscanf(string, scheck(string, "%ld:%d:%d"),
                              &hh, &mm, &ss) != 3)
      {
            error(errstring);
            return 0;
      }
      if (hh < 0 ||
            mm < 0 || mm >= MINSPERHOUR ||
            ss < 0 || ss > SECSPERMIN)
      {
            error(errstring);
            return 0;
      }
      if (LONG_MAX / SECSPERHOUR < hh)
      {
            error(_("time overflow"));
            return 0;
      }
      if (noise && hh == HOURSPERDAY && mm == 0 && ss == 0)
            warning(_("24:00 not handled by pre-1998 versions of zic"));
      if (noise && (hh > HOURSPERDAY ||
                          (hh == HOURSPERDAY && (mm != 0 || ss != 0))))
            warning(_("values over 24 hours not handled by pre-2007 versions of zic"));
      return oadd(eitol(sign) * hh * eitol(SECSPERHOUR),
                        eitol(sign) * (eitol(mm) * eitol(SECSPERMIN) + eitol(ss)));
}

static void
inrule(char **fields, int nfields)
{
      static struct rule r;

      if (nfields != RULE_FIELDS)
      {
            error(_("wrong number of fields on Rule line"));
            return;
      }
      if (*fields[RF_NAME] == '\0')
      {
            error(_("nameless rule"));
            return;
      }
      r.r_filename = filename;
      r.r_linenum = linenum;
      r.r_stdoff = gethms(fields[RF_STDOFF], _("invalid saved time"), TRUE);
      rulesub(&r, fields[RF_LOYEAR], fields[RF_HIYEAR], fields[RF_COMMAND],
                  fields[RF_MONTH], fields[RF_DAY], fields[RF_TOD]);
      r.r_name = ecpyalloc(fields[RF_NAME]);
      r.r_abbrvar = ecpyalloc(fields[RF_ABBRVAR]);
      if (max_abbrvar_len < strlen(r.r_abbrvar))
            max_abbrvar_len = strlen(r.r_abbrvar);
      rules = (struct rule *) (void *) erealloc((char *) rules,
                                                         (int) ((nrules + 1) * sizeof *rules));
      rules[nrules++] = r;
}

static int
inzone(char **fields, int nfields)
{
      int               i;
      static char *buf;

      if (nfields < ZONE_MINFIELDS || nfields > ZONE_MAXFIELDS)
      {
            error(_("wrong number of fields on Zone line"));
            return FALSE;
      }
      if (strcmp(fields[ZF_NAME], TZDEFAULT) == 0 && lcltime != NULL)
      {
            buf = erealloc(buf, (int) (132 + strlen(TZDEFAULT)));
            (void) sprintf(buf,
                          _("\"Zone %s\" line and -l option are mutually exclusive"),
                                 TZDEFAULT);
            error(buf);
            return FALSE;
      }
      if (strcmp(fields[ZF_NAME], TZDEFRULES) == 0 && psxrules != NULL)
      {
            buf = erealloc(buf, (int) (132 + strlen(TZDEFRULES)));
            (void) sprintf(buf,
                          _("\"Zone %s\" line and -p option are mutually exclusive"),
                                 TZDEFRULES);
            error(buf);
            return FALSE;
      }
      for (i = 0; i < nzones; ++i)
            if (zones[i].z_name != NULL &&
                  strcmp(zones[i].z_name, fields[ZF_NAME]) == 0)
            {
                  buf = erealloc(buf, (int) (132 +
                                                         strlen(fields[ZF_NAME]) +
                                                         strlen(zones[i].z_filename)));
                  (void) sprintf(buf,
                                       _("duplicate zone name %s (file \"%s\", line %d)"),
                                       fields[ZF_NAME],
                                       zones[i].z_filename,
                                       zones[i].z_linenum);
                  error(buf);
                  return FALSE;
            }
      return inzsub(fields, nfields, FALSE);
}

static int
inzcont(char **fields, int nfields)
{
      if (nfields < ZONEC_MINFIELDS || nfields > ZONEC_MAXFIELDS)
      {
            error(_("wrong number of fields on Zone continuation line"));
            return FALSE;
      }
      return inzsub(fields, nfields, TRUE);
}

static int
inzsub(char **fields, int nfields, int iscont)
{
      char     *cp;
      static struct zone z;
      int               i_gmtoff,
                        i_rule,
                        i_format;
      int               i_untilyear,
                        i_untilmonth;
      int               i_untilday,
                        i_untiltime;
      int               hasuntil;

      if (iscont)
      {
            i_gmtoff = ZFC_GMTOFF;
            i_rule = ZFC_RULE;
            i_format = ZFC_FORMAT;
            i_untilyear = ZFC_TILYEAR;
            i_untilmonth = ZFC_TILMONTH;
            i_untilday = ZFC_TILDAY;
            i_untiltime = ZFC_TILTIME;
            z.z_name = NULL;
      }
      else
      {
            i_gmtoff = ZF_GMTOFF;
            i_rule = ZF_RULE;
            i_format = ZF_FORMAT;
            i_untilyear = ZF_TILYEAR;
            i_untilmonth = ZF_TILMONTH;
            i_untilday = ZF_TILDAY;
            i_untiltime = ZF_TILTIME;
            z.z_name = ecpyalloc(fields[ZF_NAME]);
      }
      z.z_filename = filename;
      z.z_linenum = linenum;
      z.z_gmtoff = gethms(fields[i_gmtoff], _("invalid UTC offset"), TRUE);
      if ((cp = strchr(fields[i_format], '%')) != 0)
      {
            if (*++cp != 's' || strchr(cp, '%') != 0)
            {
                  error(_("invalid abbreviation format"));
                  return FALSE;
            }
      }
      z.z_rule = ecpyalloc(fields[i_rule]);
      z.z_format = ecpyalloc(fields[i_format]);
      if (max_format_len < strlen(z.z_format))
            max_format_len = strlen(z.z_format);
      hasuntil = nfields > i_untilyear;
      if (hasuntil)
      {
            z.z_untilrule.r_filename = filename;
            z.z_untilrule.r_linenum = linenum;
            rulesub(&z.z_untilrule,
                        fields[i_untilyear],
                        "only",
                        "",
                        (nfields > i_untilmonth) ?
                        fields[i_untilmonth] : "Jan",
                        (nfields > i_untilday) ? fields[i_untilday] : "1",
                        (nfields > i_untiltime) ? fields[i_untiltime] : "0");
            z.z_untiltime = rpytime(&z.z_untilrule,
                                                z.z_untilrule.r_loyear);
            if (iscont && nzones > 0 &&
                  z.z_untiltime > min_time &&
                  z.z_untiltime < max_time &&
                  zones[nzones - 1].z_untiltime > min_time &&
                  zones[nzones - 1].z_untiltime < max_time &&
                  zones[nzones - 1].z_untiltime >= z.z_untiltime)
            {
                  error(_("Zone continuation line end time is not after end time of previous line"));
                  return FALSE;
            }
      }
      zones = (struct zone *) (void *) erealloc((char *) zones,
                                                         (int) ((nzones + 1) * sizeof *zones));
      zones[nzones++] = z;

      /*
       * If there was an UNTIL field on this line, there's more information
       * about the zone on the next line.
       */
      return hasuntil;
}

static void
inleap(char **fields, int nfields)
{
      const char *cp;
      const struct lookup *lp;
      int               i,
                        j;
      int               year,
                        month,
                        day;
      long        dayoff,
                        tod;
      zic_t       t;

      if (nfields != LEAP_FIELDS)
      {
            error(_("wrong number of fields on Leap line"));
            return;
      }
      dayoff = 0;
      cp = fields[LP_YEAR];
      if (sscanf(cp, scheck(cp, "%d"), &year) != 1)
      {
            /*
             * Leapin' Lizards!
             */
            error(_("invalid leaping year"));
            return;
      }
      if (!leapseen || leapmaxyear < year)
            leapmaxyear = year;
      if (!leapseen || leapminyear > year)
            leapminyear = year;
      leapseen = TRUE;
      j = EPOCH_YEAR;
      while (j != year)
      {
            if (year > j)
            {
                  i = len_years[isleap(j)];
                  ++j;
            }
            else
            {
                  --j;
                  i = -len_years[isleap(j)];
            }
            dayoff = oadd(dayoff, eitol(i));
      }
      if ((lp = byword(fields[LP_MONTH], mon_names)) == NULL)
      {
            error(_("invalid month name"));
            return;
      }
      month = lp->l_value;
      j = TM_JANUARY;
      while (j != month)
      {
            i = len_months[isleap(year)][j];
            dayoff = oadd(dayoff, eitol(i));
            ++j;
      }
      cp = fields[LP_DAY];
      if (sscanf(cp, scheck(cp, "%d"), &day) != 1 ||
            day <= 0 || day > len_months[isleap(year)][month])
      {
            error(_("invalid day of month"));
            return;
      }
      dayoff = oadd(dayoff, eitol(day - 1));
      if (dayoff < min_time / SECSPERDAY)
      {
            error(_("time too small"));
            return;
      }
      if (dayoff > max_time / SECSPERDAY)
      {
            error(_("time too large"));
            return;
      }
      t = (zic_t) dayoff *SECSPERDAY;

      tod = gethms(fields[LP_TIME], _("invalid time of day"), FALSE);
      cp = fields[LP_CORR];
      {
            int               positive;
            int               count;

            if (strcmp(cp, "") == 0)
            {                                   /* infile() turns "-" into "" */
                  positive = FALSE;
                  count = 1;
            }
            else if (strcmp(cp, "--") == 0)
            {
                  positive = FALSE;
                  count = 2;
            }
            else if (strcmp(cp, "+") == 0)
            {
                  positive = TRUE;
                  count = 1;
            }
            else if (strcmp(cp, "++") == 0)
            {
                  positive = TRUE;
                  count = 2;
            }
            else
            {
                  error(_("illegal CORRECTION field on Leap line"));
                  return;
            }
            if ((lp = byword(fields[LP_ROLL], leap_types)) == NULL)
            {
                  error(_("illegal Rolling/Stationary field on Leap line"));
                  return;
            }
            leapadd(tadd(t, tod), positive, lp->l_value, count);
      }
}

static void
inlink(char **fields, int nfields)
{
      struct link l;

      if (nfields != LINK_FIELDS)
      {
            error(_("wrong number of fields on Link line"));
            return;
      }
      if (*fields[LF_FROM] == '\0')
      {
            error(_("blank FROM field on Link line"));
            return;
      }
      if (*fields[LF_TO] == '\0')
      {
            error(_("blank TO field on Link line"));
            return;
      }
      l.l_filename = filename;
      l.l_linenum = linenum;
      l.l_from = ecpyalloc(fields[LF_FROM]);
      l.l_to = ecpyalloc(fields[LF_TO]);
      links = (struct link *) (void *) erealloc((char *) links,
                                                         (int) ((nlinks + 1) * sizeof *links));
      links[nlinks++] = l;
}

static void
rulesub(struct rule * rp, const char *loyearp, const char *hiyearp,
            const char *typep, const char *monthp, const char *dayp,
            const char *timep)
{
      const struct lookup *lp;
      const char *cp;
      char     *dp;
      char     *ep;

      if ((lp = byword(monthp, mon_names)) == NULL)
      {
            error(_("invalid month name"));
            return;
      }
      rp->r_month = lp->l_value;
      rp->r_todisstd = FALSE;
      rp->r_todisgmt = FALSE;
      dp = ecpyalloc(timep);
      if (*dp != '\0')
      {
            ep = dp + strlen(dp) - 1;
            switch (lowerit(*ep))
            {
                  case 's':               /* Standard */
                        rp->r_todisstd = TRUE;
                        rp->r_todisgmt = FALSE;
                        *ep = '\0';
                        break;
                  case 'w':               /* Wall */
                        rp->r_todisstd = FALSE;
                        rp->r_todisgmt = FALSE;
                        *ep = '\0';
                        break;
                  case 'g':               /* Greenwich */
                  case 'u':               /* Universal */
                  case 'z':               /* Zulu */
                        rp->r_todisstd = TRUE;
                        rp->r_todisgmt = TRUE;
                        *ep = '\0';
                        break;
            }
      }
      rp->r_tod = gethms(dp, _("invalid time of day"), FALSE);
      ifree(dp);

      /*
       * Year work.
       */
      cp = loyearp;
      lp = byword(cp, begin_years);
      rp->r_lowasnum = lp == NULL;
      if (!rp->r_lowasnum)
            switch ((int) lp->l_value)
            {
                  case YR_MINIMUM:
                        rp->r_loyear = INT_MIN;
                        break;
                  case YR_MAXIMUM:
                        rp->r_loyear = INT_MAX;
                        break;
                  default:                /* "cannot happen" */
                        (void) fprintf(stderr,
                                             _("%s: panic: Invalid l_value %d\n"),
                                             progname, lp->l_value);
                        exit(EXIT_FAILURE);
            }
      else if (sscanf(cp, scheck(cp, "%d"), &rp->r_loyear) != 1)
      {
            error(_("invalid starting year"));
            return;
      }
      cp = hiyearp;
      lp = byword(cp, end_years);
      rp->r_hiwasnum = lp == NULL;
      if (!rp->r_hiwasnum)
            switch ((int) lp->l_value)
            {
                  case YR_MINIMUM:
                        rp->r_hiyear = INT_MIN;
                        break;
                  case YR_MAXIMUM:
                        rp->r_hiyear = INT_MAX;
                        break;
                  case YR_ONLY:
                        rp->r_hiyear = rp->r_loyear;
                        break;
                  default:                /* "cannot happen" */
                        (void) fprintf(stderr,
                                             _("%s: panic: Invalid l_value %d\n"),
                                             progname, lp->l_value);
                        exit(EXIT_FAILURE);
            }
      else if (sscanf(cp, scheck(cp, "%d"), &rp->r_hiyear) != 1)
      {
            error(_("invalid ending year"));
            return;
      }
      if (rp->r_loyear > rp->r_hiyear)
      {
            error(_("starting year greater than ending year"));
            return;
      }
      if (*typep == '\0')
            rp->r_yrtype = NULL;
      else
      {
            if (rp->r_loyear == rp->r_hiyear)
            {
                  error(_("typed single year"));
                  return;
            }
            rp->r_yrtype = ecpyalloc(typep);
      }

      /*
       * Day work. Accept things such as:  1    last-Sunday  Sun<=20  Sun>=7
       */
      dp = ecpyalloc(dayp);
      if ((lp = byword(dp, lasts)) != NULL)
      {
            rp->r_dycode = DC_DOWLEQ;
            rp->r_wday = lp->l_value;
            rp->r_dayofmonth = len_months[1][rp->r_month];
      }
      else
      {
            if ((ep = strchr(dp, '<')) != 0)
                  rp->r_dycode = DC_DOWLEQ;
            else if ((ep = strchr(dp, '>')) != 0)
                  rp->r_dycode = DC_DOWGEQ;
            else
            {
                  ep = dp;
                  rp->r_dycode = DC_DOM;
            }
            if (rp->r_dycode != DC_DOM)
            {
                  *ep++ = 0;
                  if (*ep++ != '=')
                  {
                        error(_("invalid day of month"));
                        ifree(dp);
                        return;
                  }
                  if ((lp = byword(dp, wday_names)) == NULL)
                  {
                        error(_("invalid weekday name"));
                        ifree(dp);
                        return;
                  }
                  rp->r_wday = lp->l_value;
            }
            if (sscanf(ep, scheck(ep, "%d"), &rp->r_dayofmonth) != 1 ||
                  rp->r_dayofmonth <= 0 ||
                  (rp->r_dayofmonth > len_months[1][rp->r_month]))
            {
                  error(_("invalid day of month"));
                  ifree(dp);
                  return;
            }
      }
      ifree(dp);
}

static void
convert(long val, char *buf)
{
      int               i;
      int               shift;

      for (i = 0, shift = 24; i < 4; ++i, shift -= 8)
            buf[i] = val >> shift;
}

static void
convert64(zic_t val, char *buf)
{
      int               i;
      int               shift;

      for (i = 0, shift = 56; i < 8; ++i, shift -= 8)
            buf[i] = val >> shift;
}

static void
puttzcode(long val, FILE *fp)
{
      char        buf[4];

      convert(val, buf);
      (void) fwrite((void *) buf, (size_t) sizeof buf, (size_t) 1, fp);
}

static void
puttzcode64(zic_t val, FILE *fp)
{
      char        buf[8];

      convert64(val, buf);
      (void) fwrite((void *) buf, (size_t) sizeof buf, (size_t) 1, fp);
}

static int
atcomp(const void *avp, const void *bvp)
{
      const zic_t a = ((const struct attype *) avp)->at;
      const zic_t b = ((const struct attype *) bvp)->at;

      return (a < b) ? -1 : (a > b);
}

static int
is32(zic_t x)
{
      return x == ((zic_t) ((int32) x));
}

static void
writezone(const char *name, const char *string)
{
      FILE     *fp;
      int               i,
                        j;
      int               leapcnt32,
                        leapi32;
      int               timecnt32,
                        timei32;
      int               pass;
      static char *fullname;
      static const struct tzhead tzh0;
      static struct tzhead tzh;
      zic_t       ats[TZ_MAX_TIMES];
      unsigned char types[TZ_MAX_TIMES];

      /*
       * Sort.
       */
      if (timecnt > 1)
            (void) qsort((void *) attypes, (size_t) timecnt,
                               (size_t) sizeof *attypes, atcomp);

      /*
       * Optimize.
       */
      {
            int               fromi;
            int               toi;

            toi = 0;
            fromi = 0;
            while (fromi < timecnt && attypes[fromi].at < min_time)
                  ++fromi;
            if (isdsts[0] == 0)
                  while (fromi < timecnt && attypes[fromi].type == 0)
                        ++fromi;          /* handled by default rule */
            for (; fromi < timecnt; ++fromi)
            {
                  if (toi != 0
                        && ((attypes[fromi].at
                               + gmtoffs[attypes[toi - 1].type])
                              <= (attypes[toi - 1].at
                                    + gmtoffs[toi == 1 ? 0
                                                  : attypes[toi - 2].type])))
                  {
                        attypes[toi - 1].type = attypes[fromi].type;
                        continue;
                  }
                  if (toi == 0 ||
                        attypes[toi - 1].type != attypes[fromi].type)
                        attypes[toi++] = attypes[fromi];
            }
            timecnt = toi;
      }

      /*
       * Transfer.
       */
      for (i = 0; i < timecnt; ++i)
      {
            ats[i] = attypes[i].at;
            types[i] = attypes[i].type;
      }

      /*
       * Correct for leap seconds.
       */
      for (i = 0; i < timecnt; ++i)
      {
            j = leapcnt;
            while (--j >= 0)
                  if (ats[i] > trans[j] - corr[j])
                  {
                        ats[i] = tadd(ats[i], corr[j]);
                        break;
                  }
      }

      /*
       * Figure out 32-bit-limited starts and counts.
       */
      timecnt32 = timecnt;
      timei32 = 0;
      leapcnt32 = leapcnt;
      leapi32 = 0;
      while (timecnt32 > 0 && !is32(ats[timecnt32 - 1]))
            --timecnt32;
      while (timecnt32 > 0 && !is32(ats[timei32]))
      {
            --timecnt32;
            ++timei32;
      }
      while (leapcnt32 > 0 && !is32(trans[leapcnt32 - 1]))
            --leapcnt32;
      while (leapcnt32 > 0 && !is32(trans[leapi32]))
      {
            --leapcnt32;
            ++leapi32;
      }
      fullname = erealloc(fullname,
                                    (int) (strlen(directory) + 1 + strlen(name) + 1));
      (void) sprintf(fullname, "%s/%s", directory, name);

      /*
       * Remove old file, if any, to snap links.
       */
      if (!itsdir(fullname) && remove(fullname) != 0 && errno != ENOENT)
      {
            const char *e = strerror(errno);

            (void) fprintf(stderr, _("%s: Cannot remove %s: %s\n"),
                                 progname, fullname, e);
            exit(EXIT_FAILURE);
      }
      if ((fp = fopen(fullname, "wb")) == NULL)
      {
            if (mkdirs(fullname) != 0)
                  (void) exit(EXIT_FAILURE);
            if ((fp = fopen(fullname, "wb")) == NULL)
            {
                  const char *e = strerror(errno);

                  (void) fprintf(stderr, _("%s: Cannot create %s: %s\n"),
                                       progname, fullname, e);
                  exit(EXIT_FAILURE);
            }
      }
      for (pass = 1; pass <= 2; ++pass)
      {
            register int thistimei,
                              thistimecnt;
            register int thisleapi,
                              thisleapcnt;
            register int thistimelim,
                              thisleaplim;
            int               writetype[TZ_MAX_TIMES];
            int               typemap[TZ_MAX_TYPES];
            register int thistypecnt;
            char        thischars[TZ_MAX_CHARS];
            char        thischarcnt;
            int               indmap[TZ_MAX_CHARS];

            if (pass == 1)
            {
                  thistimei = timei32;
                  thistimecnt = timecnt32;
                  thisleapi = leapi32;
                  thisleapcnt = leapcnt32;
            }
            else
            {
                  thistimei = 0;
                  thistimecnt = timecnt;
                  thisleapi = 0;
                  thisleapcnt = leapcnt;
            }
            thistimelim = thistimei + thistimecnt;
            thisleaplim = thisleapi + thisleapcnt;
            for (i = 0; i < typecnt; ++i)
                  writetype[i] = thistimecnt == timecnt;
            if (thistimecnt == 0)
            {
                  /*
                   * * No transition times fall in the current * (32- or 64-bit)
                   * window.
                   */
                  if (typecnt != 0)
                        writetype[typecnt - 1] = TRUE;
            }
            else
            {
                  for (i = thistimei - 1; i < thistimelim; ++i)
                        if (i >= 0)
                              writetype[types[i]] = TRUE;

                  /*
                   * * For America/Godthab and Antarctica/Palmer
                   */
                  if (thistimei == 0)
                        writetype[0] = TRUE;
            }
            thistypecnt = 0;
            for (i = 0; i < typecnt; ++i)
                  typemap[i] = writetype[i] ? thistypecnt++ : -1;
            for (i = 0; i < sizeof indmap / sizeof indmap[0]; ++i)
                  indmap[i] = -1;
            thischarcnt = 0;
            for (i = 0; i < typecnt; ++i)
            {
                  register char *thisabbr;

                  if (!writetype[i])
                        continue;
                  if (indmap[abbrinds[i]] >= 0)
                        continue;
                  thisabbr = &chars[abbrinds[i]];
                  for (j = 0; j < thischarcnt; ++j)
                        if (strcmp(&thischars[j], thisabbr) == 0)
                              break;
                  if (j == thischarcnt)
                  {
                        (void) strcpy(&thischars[(int) thischarcnt],
                                            thisabbr);
                        thischarcnt += strlen(thisabbr) + 1;
                  }
                  indmap[abbrinds[i]] = j;
            }
#define DO(field) (void) fwrite((void *) tzh.field, \
                        (size_t) sizeof tzh.field, (size_t) 1, fp)
            tzh = tzh0;
            (void) strncpy(tzh.tzh_magic, TZ_MAGIC, sizeof tzh.tzh_magic);
            tzh.tzh_version[0] = ZIC_VERSION;
            convert(eitol(thistypecnt), tzh.tzh_ttisgmtcnt);
            convert(eitol(thistypecnt), tzh.tzh_ttisstdcnt);
            convert(eitol(thisleapcnt), tzh.tzh_leapcnt);
            convert(eitol(thistimecnt), tzh.tzh_timecnt);
            convert(eitol(thistypecnt), tzh.tzh_typecnt);
            convert(eitol(thischarcnt), tzh.tzh_charcnt);
            DO(tzh_magic);
            DO(tzh_version);
            DO(tzh_reserved);
            DO(tzh_ttisgmtcnt);
            DO(tzh_ttisstdcnt);
            DO(tzh_leapcnt);
            DO(tzh_timecnt);
            DO(tzh_typecnt);
            DO(tzh_charcnt);
#undef DO
            for (i = thistimei; i < thistimelim; ++i)
                  if (pass == 1)
                        puttzcode((long) ats[i], fp);
                  else
                        puttzcode64(ats[i], fp);
            for (i = thistimei; i < thistimelim; ++i)
            {
                  unsigned char uc;

                  uc = typemap[types[i]];
                  (void) fwrite((void *) &uc,
                                      (size_t) sizeof uc,
                                      (size_t) 1,
                                      fp);
            }
            for (i = 0; i < typecnt; ++i)
                  if (writetype[i])
                  {
                        puttzcode(gmtoffs[i], fp);
                        (void) putc(isdsts[i], fp);
                        (void) putc((unsigned char) indmap[abbrinds[i]], fp);
                  }
            if (thischarcnt != 0)
                  (void) fwrite((void *) thischars,
                                      (size_t) sizeof thischars[0],
                                      (size_t) thischarcnt, fp);
            for (i = thisleapi; i < thisleaplim; ++i)
            {
                  register zic_t todo;

                  if (roll[i])
                  {
                        if (timecnt == 0 || trans[i] < ats[0])
                        {
                              j = 0;
                              while (isdsts[j])
                                    if (++j >= typecnt)
                                    {
                                          j = 0;
                                          break;
                                    }
                        }
                        else
                        {
                              j = 1;
                              while (j < timecnt &&
                                       trans[i] >= ats[j])
                                    ++j;
                              j = types[j - 1];
                        }
                        todo = tadd(trans[i], -gmtoffs[j]);
                  }
                  else
                        todo = trans[i];
                  if (pass == 1)
                        puttzcode((long) todo, fp);
                  else
                        puttzcode64(todo, fp);
                  puttzcode(corr[i], fp);
            }
            for (i = 0; i < typecnt; ++i)
                  if (writetype[i])
                        (void) putc(ttisstds[i], fp);
            for (i = 0; i < typecnt; ++i)
                  if (writetype[i])
                        (void) putc(ttisgmts[i], fp);
      }
      (void) fprintf(fp, "\n%s\n", string);
      if (ferror(fp) || fclose(fp))
      {
            (void) fprintf(stderr, _("%s: Error writing %s\n"),
                                 progname, fullname);
            exit(EXIT_FAILURE);
      }
}

static void
doabbr(char *abbr, const char *format, const char *letters, int isdst,
         int doquotes)
{
      char     *cp;
      char     *slashp;
      int               len;

      slashp = strchr(format, '/');
      if (slashp == NULL)
      {
            if (letters == NULL)
                  (void) strcpy(abbr, format);
            else
                  (void) sprintf(abbr, format, letters);
      }
      else if (isdst)
            (void) strcpy(abbr, slashp + 1);
      else
      {
            if (slashp > format)
                  (void) strncpy(abbr, format,
                                       (unsigned) (slashp - format));
            abbr[slashp - format] = '\0';
      }
      if (!doquotes)
            return;
      for (cp = abbr; *cp != '\0'; ++cp)
            if (strchr("ABCDEFGHIJKLMNOPQRSTUVWXYZ", *cp) == NULL &&
                  strchr("abcdefghijklmnopqrstuvwxyz", *cp) == NULL)
                  break;
      len = strlen(abbr);
      if (len > 0 && *cp == '\0')
            return;
      abbr[len + 2] = '\0';
      abbr[len + 1] = '>';
      for (; len > 0; --len)
            abbr[len] = abbr[len - 1];
      abbr[0] = '<';
}

static void
updateminmax(int x)
{
      if (min_year > x)
            min_year = x;
      if (max_year < x)
            max_year = x;
}

static int
stringoffset(char *result, long offset)
{
      int               hours;
      int               minutes;
      int               seconds;

      result[0] = '\0';
      if (offset < 0)
      {
            (void) strcpy(result, "-");
            offset = -offset;
      }
      seconds = offset % SECSPERMIN;
      offset /= SECSPERMIN;
      minutes = offset % MINSPERHOUR;
      offset /= MINSPERHOUR;
      hours = offset;
      if (hours >= HOURSPERDAY)
      {
            result[0] = '\0';
            return -1;
      }
      (void) sprintf(end(result), "%d", hours);
      if (minutes != 0 || seconds != 0)
      {
            (void) sprintf(end(result), ":%02d", minutes);
            if (seconds != 0)
                  (void) sprintf(end(result), ":%02d", seconds);
      }
      return 0;
}

static int
stringrule(char *result, const struct rule * rp, long dstoff, long gmtoff)
{
      long        tod;

      result = end(result);
      if (rp->r_dycode == DC_DOM)
      {
            int               month,
                              total;

            if (rp->r_dayofmonth == 29 && rp->r_month == TM_FEBRUARY)
                  return -1;
            total = 0;
            for (month = 0; month < rp->r_month; ++month)
                  total += len_months[0][month];
            (void) sprintf(result, "J%d", total + rp->r_dayofmonth);
      }
      else
      {
            int               week;

            if (rp->r_dycode == DC_DOWGEQ)
            {
                  week = 1 + rp->r_dayofmonth / DAYSPERWEEK;
                  if ((week - 1) * DAYSPERWEEK + 1 != rp->r_dayofmonth)
                        return -1;
            }
            else if (rp->r_dycode == DC_DOWLEQ)
            {
                  if (rp->r_dayofmonth == len_months[1][rp->r_month])
                        week = 5;
                  else
                  {
                        week = 1 + rp->r_dayofmonth / DAYSPERWEEK;
                        if (week * DAYSPERWEEK - 1 != rp->r_dayofmonth)
                              return -1;
                  }
            }
            else
                  return -1;              /* "cannot happen" */
            (void) sprintf(result, "M%d.%d.%d",
                                 rp->r_month + 1, week, rp->r_wday);
      }
      tod = rp->r_tod;
      if (rp->r_todisgmt)
            tod += gmtoff;
      if (rp->r_todisstd && rp->r_stdoff == 0)
            tod += dstoff;
      if (tod < 0)
      {
            result[0] = '\0';
            return -1;
      }
      if (tod != 2 * SECSPERMIN * MINSPERHOUR)
      {
            (void) strcat(result, "/");
            if (stringoffset(end(result), tod) != 0)
                  return -1;
      }
      return 0;
}

static void
stringzone(char *result, const struct zone * zpfirst, int zonecount)
{
      const struct zone *zp;
      struct rule *rp;
      struct rule *stdrp;
      struct rule *dstrp;
      int               i;
      const char *abbrvar;

      result[0] = '\0';
      zp = zpfirst + zonecount - 1;
      stdrp = dstrp = NULL;
      for (i = 0; i < zp->z_nrules; ++i)
      {
            rp = &zp->z_rules[i];
            if (rp->r_hiwasnum || rp->r_hiyear != INT_MAX)
                  continue;
            if (rp->r_yrtype != NULL)
                  continue;
            if (rp->r_stdoff == 0)
            {
                  if (stdrp == NULL)
                        stdrp = rp;
                  else
                        return;
            }
            else
            {
                  if (dstrp == NULL)
                        dstrp = rp;
                  else
                        return;
            }
      }
      if (stdrp == NULL && dstrp == NULL)
      {
            /*
             * There are no rules running through "max". Let's find the latest
             * rule.
             */
            for (i = 0; i < zp->z_nrules; ++i)
            {
                  rp = &zp->z_rules[i];
                  if (stdrp == NULL || rp->r_hiyear > stdrp->r_hiyear ||
                        (rp->r_hiyear == stdrp->r_hiyear &&
                         rp->r_month > stdrp->r_month))
                        stdrp = rp;
            }
            if (stdrp != NULL && stdrp->r_stdoff != 0)
                  return;                       /* We end up in DST (a POSIX no-no). */

            /*
             * Horrid special case: if year is 2037, presume this is a zone
             * handled on a year-by-year basis; do not try to apply a rule to the
             * zone.
             */
            if (stdrp != NULL && stdrp->r_hiyear == 2037)
                  return;
      }
      if (stdrp == NULL && zp->z_nrules != 0)
            return;
      abbrvar = (stdrp == NULL) ? "" : stdrp->r_abbrvar;
      doabbr(result, zp->z_format, abbrvar, FALSE, TRUE);
      if (stringoffset(end(result), -zp->z_gmtoff) != 0)
      {
            result[0] = '\0';
            return;
      }
      if (dstrp == NULL)
            return;
      doabbr(end(result), zp->z_format, dstrp->r_abbrvar, TRUE, TRUE);
      if (dstrp->r_stdoff != SECSPERMIN * MINSPERHOUR)
            if (stringoffset(end(result),
                                     -(zp->z_gmtoff + dstrp->r_stdoff)) != 0)
            {
                  result[0] = '\0';
                  return;
            }
      (void) strcat(result, ",");
      if (stringrule(result, dstrp, dstrp->r_stdoff, zp->z_gmtoff) != 0)
      {
            result[0] = '\0';
            return;
      }
      (void) strcat(result, ",");
      if (stringrule(result, stdrp, dstrp->r_stdoff, zp->z_gmtoff) != 0)
      {
            result[0] = '\0';
            return;
      }
}

static void
outzone(const struct zone * zpfirst, int zonecount)
{
      const struct zone *zp;
      struct rule *rp;
      int               i,
                        j;
      int               usestart,
                        useuntil;
      zic_t       starttime = 0;
      zic_t       untiltime = 0;
      long        gmtoff;
      long        stdoff;
      int               year;
      long        startoff;
      int               startttisstd;
      int               startttisgmt;
      int               type;
      char     *startbuf;
      char     *ab;
      char     *envvar;
      int               max_abbr_len;
      int               max_envvar_len;

      max_abbr_len = 2 + max_format_len + max_abbrvar_len;
      max_envvar_len = 2 * max_abbr_len + 5 * 9;
      startbuf = emalloc(max_abbr_len + 1);
      ab = emalloc(max_abbr_len + 1);
      envvar = emalloc(max_envvar_len + 1);

      /*
       * Now. . .finally. . .generate some useful data!
       */
      timecnt = 0;
      typecnt = 0;
      charcnt = 0;

      /*
       * Thanks to Earl Chew for noting the need to unconditionally initialize
       * startttisstd.
       */
      startttisstd = FALSE;
      startttisgmt = FALSE;
      min_year = max_year = EPOCH_YEAR;
      if (leapseen)
      {
            updateminmax(leapminyear);
            updateminmax(leapmaxyear);
      }
      for (i = 0; i < zonecount; ++i)
      {
            zp = &zpfirst[i];
            if (i < zonecount - 1)
                  updateminmax(zp->z_untilrule.r_loyear);
            for (j = 0; j < zp->z_nrules; ++j)
            {
                  rp = &zp->z_rules[j];
                  if (rp->r_lowasnum)
                        updateminmax(rp->r_loyear);
                  if (rp->r_hiwasnum)
                        updateminmax(rp->r_hiyear);
            }
      }

      /*
       * Generate lots of data if a rule can't cover all future times.
       */
      stringzone(envvar, zpfirst, zonecount);
      if (noise && envvar[0] == '\0')
      {
            char     *wp;

            wp = ecpyalloc(_("no POSIX environment variable for zone"));
            wp = ecatalloc(wp, " ");
            wp = ecatalloc(wp, zpfirst->z_name);
            warning(wp);
            ifree(wp);
      }
      if (envvar[0] == '\0')
      {
            if (min_year >= INT_MIN + YEARSPERREPEAT)
                  min_year -= YEARSPERREPEAT;
            else
                  min_year = INT_MIN;
            if (max_year <= INT_MAX - YEARSPERREPEAT)
                  max_year += YEARSPERREPEAT;
            else
                  max_year = INT_MAX;
      }

      /*
       * For the benefit of older systems, generate data from 1900 through 2037.
       */
      if (min_year > 1900)
            min_year = 1900;
      if (max_year < 2037)
            max_year = 2037;
      for (i = 0; i < zonecount; ++i)
      {
            /*
             * A guess that may well be corrected later.
             */
            stdoff = 0;
            zp = &zpfirst[i];
            usestart = i > 0 && (zp - 1)->z_untiltime > min_time;
            useuntil = i < (zonecount - 1);
            if (useuntil && zp->z_untiltime <= min_time)
                  continue;
            gmtoff = zp->z_gmtoff;
            eat(zp->z_filename, zp->z_linenum);
            *startbuf = '\0';
            startoff = zp->z_gmtoff;
            if (zp->z_nrules == 0)
            {
                  stdoff = zp->z_stdoff;
                  doabbr(startbuf, zp->z_format,
                           (char *) NULL, stdoff != 0, FALSE);
                  type = addtype(oadd(zp->z_gmtoff, stdoff),
                                       startbuf, stdoff != 0, startttisstd,
                                       startttisgmt);
                  if (usestart)
                  {
                        addtt(starttime, type);
                        usestart = FALSE;
                  }
                  else if (stdoff != 0)
                        addtt(min_time, type);
            }
            else
                  for (year = min_year; year <= max_year; ++year)
                  {
                        if (useuntil && year > zp->z_untilrule.r_hiyear)
                              break;

                        /*
                         * Mark which rules to do in the current year. For those to
                         * do, calculate rpytime(rp, year);
                         */
                        for (j = 0; j < zp->z_nrules; ++j)
                        {
                              rp = &zp->z_rules[j];
                              eats(zp->z_filename, zp->z_linenum,
                                     rp->r_filename, rp->r_linenum);
                              rp->r_todo = year >= rp->r_loyear &&
                                    year <= rp->r_hiyear &&
                                    yearistype(year, rp->r_yrtype);
                              if (rp->r_todo)
                                    rp->r_temp = rpytime(rp, year);
                        }
                        for (;;)
                        {
                              int               k;
                              zic_t       jtime,
                                                ktime = 0;
                              long        offset;

                              if (useuntil)
                              {
                                    /*
                                     * Turn untiltime into UTC assuming the current gmtoff
                                     * and stdoff values.
                                     */
                                    untiltime = zp->z_untiltime;
                                    if (!zp->z_untilrule.r_todisgmt)
                                          untiltime = tadd(untiltime,
                                                                   -gmtoff);
                                    if (!zp->z_untilrule.r_todisstd)
                                          untiltime = tadd(untiltime,
                                                                   -stdoff);
                              }

                              /*
                               * Find the rule (of those to do, if any) that takes
                               * effect earliest in the year.
                               */
                              k = -1;
                              for (j = 0; j < zp->z_nrules; ++j)
                              {
                                    rp = &zp->z_rules[j];
                                    if (!rp->r_todo)
                                          continue;
                                    eats(zp->z_filename, zp->z_linenum,
                                           rp->r_filename, rp->r_linenum);
                                    offset = rp->r_todisgmt ? 0 : gmtoff;
                                    if (!rp->r_todisstd)
                                          offset = oadd(offset, stdoff);
                                    jtime = rp->r_temp;
                                    if (jtime == min_time ||
                                          jtime == max_time)
                                          continue;
                                    jtime = tadd(jtime, -offset);
                                    if (k < 0 || jtime < ktime)
                                    {
                                          k = j;
                                          ktime = jtime;
                                    }
                              }
                              if (k < 0)
                                    break;      /* go on to next year */
                              rp = &zp->z_rules[k];
                              rp->r_todo = FALSE;
                              if (useuntil && ktime >= untiltime)
                                    break;
                              stdoff = rp->r_stdoff;
                              if (usestart && ktime == starttime)
                                    usestart = FALSE;
                              if (usestart)
                              {
                                    if (ktime < starttime)
                                    {
                                          startoff = oadd(zp->z_gmtoff,
                                                                  stdoff);
                                          doabbr(startbuf, zp->z_format,
                                                   rp->r_abbrvar,
                                                   rp->r_stdoff != 0,
                                                   FALSE);
                                          continue;
                                    }
                                    if (*startbuf == '\0' &&
                                          startoff == oadd(zp->z_gmtoff, stdoff))
                                    {
                                          doabbr(startbuf,
                                                   zp->z_format,
                                                   rp->r_abbrvar,
                                                   rp->r_stdoff !=
                                                   0,
                                                   FALSE);
                                    }
                              }
                              eats(zp->z_filename, zp->z_linenum,
                                     rp->r_filename, rp->r_linenum);
                              doabbr(ab, zp->z_format, rp->r_abbrvar,
                                       rp->r_stdoff != 0, FALSE);
                              offset = oadd(zp->z_gmtoff, rp->r_stdoff);
                              type = addtype(offset, ab, rp->r_stdoff != 0,
                                                   rp->r_todisstd, rp->r_todisgmt);
                              addtt(ktime, type);
                        }
                  }
            if (usestart)
            {
                  if (*startbuf == '\0' &&
                        zp->z_format != NULL &&
                        strchr(zp->z_format, '%') == NULL &&
                        strchr(zp->z_format, '/') == NULL)
                        (void) strcpy(startbuf, zp->z_format);
                  eat(zp->z_filename, zp->z_linenum);
                  if (*startbuf == '\0')
                        error(_("cannot determine time zone abbreviation to use just after until time"));
                  else
                        addtt(starttime,
                                addtype(startoff, startbuf,
                                            startoff != zp->z_gmtoff,
                                            startttisstd,
                                            startttisgmt));
            }

            /*
             * Now we may get to set starttime for the next zone line.
             */
            if (useuntil)
            {
                  startttisstd = zp->z_untilrule.r_todisstd;
                  startttisgmt = zp->z_untilrule.r_todisgmt;
                  starttime = zp->z_untiltime;
                  if (!startttisstd)
                        starttime = tadd(starttime, -stdoff);
                  if (!startttisgmt)
                        starttime = tadd(starttime, -gmtoff);
            }
      }
      writezone(zpfirst->z_name, envvar);
      ifree(startbuf);
      ifree(ab);
      ifree(envvar);
}

static void
addtt(const zic_t starttime, int type)
{
      if (starttime <= min_time ||
            (timecnt == 1 && attypes[0].at < min_time))
      {
            gmtoffs[0] = gmtoffs[type];
            isdsts[0] = isdsts[type];
            ttisstds[0] = ttisstds[type];
            ttisgmts[0] = ttisgmts[type];
            if (abbrinds[type] != 0)
                  (void) strcpy(chars, &chars[abbrinds[type]]);
            abbrinds[0] = 0;
            charcnt = strlen(chars) + 1;
            typecnt = 1;
            timecnt = 0;
            type = 0;
      }
      if (timecnt >= TZ_MAX_TIMES)
      {
            error(_("too many transitions?!"));
            exit(EXIT_FAILURE);
      }
      attypes[timecnt].at = starttime;
      attypes[timecnt].type = type;
      ++timecnt;
}

static int
addtype(long gmtoff, const char *abbr, int isdst,
            int ttisstd, int ttisgmt)
{
      int               i;
      int               j;

      if (isdst != TRUE && isdst != FALSE)
      {
            error(_("internal error - addtype called with bad isdst"));
            exit(EXIT_FAILURE);
      }
      if (ttisstd != TRUE && ttisstd != FALSE)
      {
            error(_("internal error - addtype called with bad ttisstd"));
            exit(EXIT_FAILURE);
      }
      if (ttisgmt != TRUE && ttisgmt != FALSE)
      {
            error(_("internal error - addtype called with bad ttisgmt"));
            exit(EXIT_FAILURE);
      }

      /*
       * See if there's already an entry for this zone type. If so, just return
       * its index.
       */
      for (i = 0; i < typecnt; ++i)
      {
            if (gmtoff == gmtoffs[i] && isdst == isdsts[i] &&
                  strcmp(abbr, &chars[abbrinds[i]]) == 0 &&
                  ttisstd == ttisstds[i] &&
                  ttisgmt == ttisgmts[i])
                  return i;
      }

      /*
       * There isn't one; add a new one, unless there are already too many.
       */
      if (typecnt >= TZ_MAX_TYPES)
      {
            error(_("too many local time types"));
            exit(EXIT_FAILURE);
      }
      if (!(-1L - 2147483647L <= gmtoff && gmtoff <= 2147483647L))
      {
            error(_("UTC offset out of range"));
            exit(EXIT_FAILURE);
      }
      gmtoffs[i] = gmtoff;
      isdsts[i] = isdst;
      ttisstds[i] = ttisstd;
      ttisgmts[i] = ttisgmt;

      for (j = 0; j < charcnt; ++j)
            if (strcmp(&chars[j], abbr) == 0)
                  break;
      if (j == charcnt)
            newabbr(abbr);
      abbrinds[i] = j;
      ++typecnt;
      return i;
}

static void
leapadd(const zic_t t, int positive, int rolling, int count)
{
      int               i;
      int               j;

      if (leapcnt + (positive ? count : 1) > TZ_MAX_LEAPS)
      {
            error(_("too many leap seconds"));
            exit(EXIT_FAILURE);
      }
      for (i = 0; i < leapcnt; ++i)
            if (t <= trans[i])
            {
                  if (t == trans[i])
                  {
                        error(_("repeated leap second moment"));
                        exit(EXIT_FAILURE);
                  }
                  break;
            }
      do
      {
            for (j = leapcnt; j > i; --j)
            {
                  trans[j] = trans[j - 1];
                  corr[j] = corr[j - 1];
                  roll[j] = roll[j - 1];
            }
            trans[i] = t;
            corr[i] = positive ? 1L : eitol(-count);
            roll[i] = rolling;
            ++leapcnt;
      } while (positive && --count != 0);
}

static void
adjleap(void)
{
      int               i;
      long        last = 0;

      /*
       * propagate leap seconds forward
       */
      for (i = 0; i < leapcnt; ++i)
      {
            trans[i] = tadd(trans[i], last);
            last = corr[i] += last;
      }
}

static int
yearistype(int year, const char *type)
{
      static char *buf;
      int               result;

      if (type == NULL || *type == '\0')
            return TRUE;
      buf = erealloc(buf, (int) (132 + strlen(yitcommand) + strlen(type)));
      (void) sprintf(buf, "%s %d %s", yitcommand, year, type);
      result = system(buf);
      if (WIFEXITED(result))
            switch (WEXITSTATUS(result))
            {
                  case 0:
                        return TRUE;
                  case 1:
                        return FALSE;
            }
      error(_("Wild result from command execution"));
      (void) fprintf(stderr, _("%s: command was '%s', result was %d\n"),
                           progname, buf, result);
      for (;;)
            exit(EXIT_FAILURE);
}

static int
lowerit(int a)
{
      a = (unsigned char) a;
      return (isascii(a) && isupper(a)) ? tolower(a) : a;
}

static int
ciequal(const char *ap, const char *bp)
{
      while (lowerit(*ap) == lowerit(*bp++))
            if (*ap++ == '\0')
                  return TRUE;
      return FALSE;
}

static int
itsabbr(const char *abbr, const char *word)
{
      if (lowerit(*abbr) != lowerit(*word))
            return FALSE;
      ++word;
      while (*++abbr != '\0')
            do
            {
                  if (*word == '\0')
                        return FALSE;
            } while (lowerit(*word++) != lowerit(*abbr));
      return TRUE;
}

static const struct lookup *
byword(const char *word, const struct lookup * table)
{
      const struct lookup *foundlp;
      const struct lookup *lp;

      if (word == NULL || table == NULL)
            return NULL;

      /*
       * Look for exact match.
       */
      for (lp = table; lp->l_word != NULL; ++lp)
            if (ciequal(word, lp->l_word))
                  return lp;

      /*
       * Look for inexact match.
       */
      foundlp = NULL;
      for (lp = table; lp->l_word != NULL; ++lp)
            if (itsabbr(word, lp->l_word))
            {
                  if (foundlp == NULL)
                        foundlp = lp;
                  else
                        return NULL;      /* multiple inexact matches */
            }
      return foundlp;
}

static char **
getfields(char *cp)
{
      char     *dp;
      char    **array;
      int               nsubs;

      if (cp == NULL)
            return NULL;
      array = (char **) (void *)
            emalloc((int) ((strlen(cp) + 1) * sizeof *array));
      nsubs = 0;
      for (;;)
      {
            while (isascii((unsigned char) *cp) &&
                     isspace((unsigned char) *cp))
                  ++cp;
            if (*cp == '\0' || *cp == '#')
                  break;
            array[nsubs++] = dp = cp;
            do
            {
                  if ((*dp = *cp++) != '"')
                        ++dp;
                  else
                        while ((*dp = *cp++) != '"')
                              if (*dp != '\0')
                                    ++dp;
                              else
                              {
                                    error(_("Odd number of quotation marks"));
                                    exit(1);
                              }
            } while (*cp != '\0' && *cp != '#' &&
                         (!isascii(*cp) || !isspace((unsigned char) *cp)));
            if (isascii(*cp) && isspace((unsigned char) *cp))
                  ++cp;
            *dp = '\0';
      }
      array[nsubs] = NULL;
      return array;
}

static long
oadd(long t1, long t2)
{
      long        t;

      t = t1 + t2;
      if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1))
      {
            error(_("time overflow"));
            exit(EXIT_FAILURE);
      }
      return t;
}

static zic_t
tadd(const zic_t t1, long t2)
{
      zic_t       t;

      if (t1 == max_time && t2 > 0)
            return max_time;
      if (t1 == min_time && t2 < 0)
            return min_time;
      t = t1 + t2;
      if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1))
      {
            error(_("time overflow"));
            exit(EXIT_FAILURE);
      }
      return t;
}

/*
 * Given a rule, and a year, compute the date - in seconds since January 1,
 * 1970, 00:00 LOCAL time - in that year that the rule refers to.
 */

static zic_t
rpytime(const struct rule * rp, int wantedy)
{
      int               y,
                        m,
                        i;
      long        dayoff;                 /* with a nod to Margaret O. */
      zic_t       t;

      if (wantedy == INT_MIN)
            return min_time;
      if (wantedy == INT_MAX)
            return max_time;
      dayoff = 0;
      m = TM_JANUARY;
      y = EPOCH_YEAR;
      while (wantedy != y)
      {
            if (wantedy > y)
            {
                  i = len_years[isleap(y)];
                  ++y;
            }
            else
            {
                  --y;
                  i = -len_years[isleap(y)];
            }
            dayoff = oadd(dayoff, eitol(i));
      }
      while (m != rp->r_month)
      {
            i = len_months[isleap(y)][m];
            dayoff = oadd(dayoff, eitol(i));
            ++m;
      }
      i = rp->r_dayofmonth;
      if (m == TM_FEBRUARY && i == 29 && !isleap(y))
      {
            if (rp->r_dycode == DC_DOWLEQ)
                  --i;
            else
            {
                  error(_("use of 2/29 in non leap-year"));
                  exit(EXIT_FAILURE);
            }
      }
      --i;
      dayoff = oadd(dayoff, eitol(i));
      if (rp->r_dycode == DC_DOWGEQ || rp->r_dycode == DC_DOWLEQ)
      {
            long        wday;

#define LDAYSPERWEEK    ((long) DAYSPERWEEK)
            wday = eitol(EPOCH_WDAY);

            /*
             * Don't trust mod of negative numbers.
             */
            if (dayoff >= 0)
                  wday = (wday + dayoff) % LDAYSPERWEEK;
            else
            {
                  wday -= ((-dayoff) % LDAYSPERWEEK);
                  if (wday < 0)
                        wday += LDAYSPERWEEK;
            }
            while (wday != eitol(rp->r_wday))
                  if (rp->r_dycode == DC_DOWGEQ)
                  {
                        dayoff = oadd(dayoff, (long) 1);
                        if (++wday >= LDAYSPERWEEK)
                              wday = 0;
                        ++i;
                  }
                  else
                  {
                        dayoff = oadd(dayoff, (long) -1);
                        if (--wday < 0)
                              wday = LDAYSPERWEEK - 1;
                        --i;
                  }
            if (i < 0 || i >= len_months[isleap(y)][m])
            {
                  if (noise)
                        warning(_("rule goes past start/end of month--\
will not work with pre-2004 versions of zic"));
            }
      }
      if (dayoff < min_time / SECSPERDAY)
            return min_time;
      if (dayoff > max_time / SECSPERDAY)
            return max_time;
      t = (zic_t) dayoff *SECSPERDAY;

      return tadd(t, rp->r_tod);
}

static void
newabbr(const char *string)
{
      int               i;

      if (strcmp(string, GRANDPARENTED) != 0)
      {
            const char *cp;
            char     *wp;

            /*
             * Want one to ZIC_MAX_ABBR_LEN_WO_WARN alphabetics optionally
             * followed by a + or - and a number from 1 to 14.
             */
            cp = string;
            wp = NULL;
            while (isascii((unsigned char) *cp) &&
                     isalpha((unsigned char) *cp))
                  ++cp;
            if (cp - string == 0)
                  wp = _("time zone abbreviation lacks alphabetic at start");
            if (noise && cp - string > 3)
                  wp = _("time zone abbreviation has more than 3 alphabetics");
            if (cp - string > ZIC_MAX_ABBR_LEN_WO_WARN)
                  wp = _("time zone abbreviation has too many alphabetics");
            if (wp == NULL && (*cp == '+' || *cp == '-'))
            {
                  ++cp;
                  if (isascii((unsigned char) *cp) &&
                        isdigit((unsigned char) *cp))
                        if (*cp++ == '1' &&
                              *cp >= '0' && *cp <= '4')
                              ++cp;
            }
            if (*cp != '\0')
                  wp = _("time zone abbreviation differs from POSIX standard");
            if (wp != NULL)
            {
                  wp = ecpyalloc(wp);
                  wp = ecatalloc(wp, " (");
                  wp = ecatalloc(wp, string);
                  wp = ecatalloc(wp, ")");
                  warning(wp);
                  ifree(wp);
            }
      }
      i = strlen(string) + 1;
      if (charcnt + i > TZ_MAX_CHARS)
      {
            error(_("too many, or too long, time zone abbreviations"));
            exit(EXIT_FAILURE);
      }
      (void) strcpy(&chars[charcnt], string);
      charcnt += eitol(i);
}

static int
mkdirs(char *argname)
{
      char     *name;
      char     *cp;

      if (argname == NULL || *argname == '\0')
            return 0;
      cp = name = ecpyalloc(argname);
      while ((cp = strchr(cp + 1, '/')) != 0)
      {
            *cp = '\0';
#ifdef WIN32

            /*
             * DOS drive specifier?
             */
            if (isalpha((unsigned char) name[0]) &&
                  name[1] == ':' && name[2] == '\0')
            {
                  *cp = '/';
                  continue;
            }
#endif   /* WIN32 */
            if (!itsdir(name))
            {
                  /*
                   * It doesn't seem to exist, so we try to create it. Creation may
                   * fail because of the directory being created by some other
                   * multiprocessor, so we get to do extra checking.
                   */
                  if (mkdir(name, MKDIR_UMASK) != 0)
                  {
                        const char *e = strerror(errno);

                        if (errno != EEXIST || !itsdir(name))
                        {
                              (void) fprintf(stderr,
                                                   _("%s: Cannot create directory %s: %s\n"),
                                                   progname, name, e);
                              ifree(name);
                              return -1;
                        }
                  }
            }
            *cp = '/';
      }
      ifree(name);
      return 0;
}

static long
eitol(int i)
{
      long        l;

      l = i;
      if ((i < 0 && l >= 0) || (i == 0 && l != 0) || (i > 0 && l <= 0))
      {
            (void) fprintf(stderr,
                                 _("%s: %d did not sign extend correctly\n"),
                                 progname, i);
            exit(EXIT_FAILURE);
      }
      return l;
}

/*
 * UNIX was a registered trademark of The Open Group in 2003.
 */


#ifdef WIN32
/*
 * To run on win32
 */
int
link(const char *oldpath, const char *newpath)
{
      if (!CopyFile(oldpath, newpath, FALSE))
            return -1;
      return 0;
}
#endif

/*
 *    This allows zic to compile by just returning a dummy value.
 *    localtime.c references it, but no one uses it from zic.
 */
int
pg_open_tzfile(const char *name, char *canonname)
{
      return -1;
}

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