Logo Search packages:      
Sourcecode: glibc version File versions

zic.c

#ifndef lint
#ifndef NOID
static char elsieid[] = "@(#)zic.c  7.107";
#endif /* !defined NOID */
#endif /* !defined lint */

#include "private.h"
#include "locale.h"
#include "tzfile.h"

#if HAVE_SYS_STAT_H
#include "sys/stat.h"
#endif
#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

/*
** 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

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_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) */
      time_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;
      time_t            z_untiltime;
};

extern int  getopt P((int argc, char * const argv[],
                  const char * options));
extern int  link P((const char * fromname, const char * toname));
extern char *     optarg;
extern int  optind;

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

#if !(HAVE_STRERROR - 0)
static char *     strerror P((int));
#endif /* !(HAVE_STRERROR - 0) */

static int        charcnt;
static int        errors;
static const char *     filename;
static int        leapcnt;
static int        linenum;
static time_t           max_time;
static int        max_year;
static int        max_year_representable;
static time_t           min_time;
static int        min_year;
static int        min_year_representable;
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 P((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 {
      time_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 time_t           trans[TZ_MAX_LEAPS];
static long       corr[TZ_MAX_LEAPS];
static char       roll[TZ_MAX_LEAPS];

/*
** Memory allocation.
*/

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

            (void) fprintf(stderr, _("%s: Memory exhausted: %s\n"),
                  progname, e);
            (void) 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.
*/

#if !(HAVE_STRERROR - 0)
static char *
strerror(errnum)
int   errnum;
{
      extern char *     sys_errlist[];
      extern int  sys_nerr;

      return (errnum > 0 && errnum <= sys_nerr) ?
            sys_errlist[errnum] : _("Unknown system error");
}
#endif /* !(HAVE_STRERROR - 0) */

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

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

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

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

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

static const char *     psxrules;
static const char *     lcltime;
static const char *     directory;
static const char *     leapsec;
static const char *     yitcommand;
static int        sflag = FALSE;

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

#ifdef unix
      (void) umask(umask(S_IWGRP | S_IWOTH) | (S_IWGRP | S_IWOTH));
#endif /* defined unix */
#if HAVE_GETTEXT - 0
      (void) setlocale(LC_CTYPE, "");
      (void) setlocale(LC_MESSAGES, "");
#ifdef TZ_DOMAINDIR
      (void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR);
#endif /* defined TEXTDOMAINDIR */
      (void) textdomain(TZ_DOMAIN);
#endif /* HAVE_GETTEXT - 0 */
      progname = argv[0];
      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);
                              (void) exit(EXIT_FAILURE);
                        }
                        break;
                  case 'l':
                        if (lcltime == NULL)
                              lcltime = optarg;
                        else {
                              (void) fprintf(stderr,
_("%s: More than one -l option specified\n"),
                                    progname);
                              (void) exit(EXIT_FAILURE);
                        }
                        break;
                  case 'p':
                        if (psxrules == NULL)
                              psxrules = optarg;
                        else {
                              (void) fprintf(stderr,
_("%s: More than one -p option specified\n"),
                                    progname);
                              (void) exit(EXIT_FAILURE);
                        }
                        break;
                  case 'y':
                        if (yitcommand == NULL)
                              yitcommand = optarg;
                        else {
                              (void) fprintf(stderr,
_("%s: More than one -y option specified\n"),
                                    progname);
                              (void) exit(EXIT_FAILURE);
                        }
                        break;
                  case 'L':
                        if (leapsec == NULL)
                              leapsec = optarg;
                        else {
                              (void) fprintf(stderr,
_("%s: More than one -L option specified\n"),
                                    progname);
                              (void) exit(EXIT_FAILURE);
                        }
                        break;
                  case 'v':
                        noise = TRUE;
                        break;
                  case 's':
                        sflag = TRUE;
                        break;
            }
      if (optind == argc - 1 && strcmp(argv[optind], "=") == 0)
            usage();    /* usage message by request */
      if (directory == NULL)
            directory = TZDIR;
      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)
            (void) 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 (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(fromfile, tofile)
const char * const      fromfile;
const char * const      tofile;
{
      register char *   fromname;
      register char *   toname;

      if (fromfile[0] == '/')
            fromname = ecpyalloc(fromfile);
      else {
            fromname = ecpyalloc(directory);
            fromname = ecatalloc(fromname, "/");
            fromname = ecatalloc(fromname, fromfile);
      }
      if (tofile[0] == '/')
            toname = ecpyalloc(tofile);
      else {
            toname = ecpyalloc(directory);
            toname = ecatalloc(toname, "/");
            toname = ecatalloc(toname, tofile);
      }
      /*
      ** 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)
                  (void) exit(EXIT_FAILURE);

            result = link(fromname, toname);
#if (HAVE_SYMLINK - 0)
            if (result != 0 &&
                access(fromname, F_OK) == 0 &&
                !itsdir(fromname)) {
                    const char *s = tofile;
                    register char * symlinkcontents = NULL;
                    while ((s = strchr(s+1, '/')) != NULL)
                          symlinkcontents = ecatalloc(symlinkcontents, "../");
                  symlinkcontents = ecatalloc(symlinkcontents, fromname);

                  result = unlink(toname);
                  if (result != 0 && errno != ENOENT) {
                        const char *e = strerror(errno);

                        (void) fprintf(stderr,
                                     _("%s: Can't unlink  %s: %s\n"),
                                     progname, toname, e);
                        (void) exit(EXIT_FAILURE);
                  }

                  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: Can't link from %s to %s: %s\n"),
                        progname, fromname, toname, e);
                  (void) exit(EXIT_FAILURE);
            }
      }
      ifree(fromname);
      ifree(toname);
}

#ifndef INT_MAX
#define INT_MAX   ((int) (((unsigned)~0)>>1))
#endif /* !defined INT_MAX */

#ifndef INT_MIN
#define INT_MIN   ((int) ~(((unsigned)~0)>>1))
#endif /* !defined INT_MIN */

/*
** The tz file format currently allows at most 32-bit quantities.
** This restriction should be removed before signed 32-bit values
** wrap around in 2038, but unfortunately this will require a
** change to the tz file format.
*/

#define MAX_BITS_IN_FILE      32
#define TIME_T_BITS_IN_FILE   ((TYPE_BIT(time_t) < MAX_BITS_IN_FILE) ? TYPE_BIT(time_t) : MAX_BITS_IN_FILE)

static void
setboundaries P((void))
{
      if (TYPE_SIGNED(time_t)) {
            min_time = ~ (time_t) 0;
            min_time <<= TIME_T_BITS_IN_FILE - 1;
            max_time = ~ (time_t) 0 - min_time;
            if (sflag)
                  min_time = 0;
      } else {
            min_time = 0;
            max_time = 2 - sflag;
            max_time <<= TIME_T_BITS_IN_FILE - 1;
            --max_time;
      }
      min_year = TM_YEAR_BASE + gmtime(&min_time)->tm_year;
      max_year = TM_YEAR_BASE + gmtime(&max_time)->tm_year;
      min_year_representable = min_year;
      max_year_representable = max_year;
}

static int
itsdir(name)
const char * const      name;
{
      register char *   myname;
      register 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(cp1, cp2)
const void *      cp1;
const void *      cp2;
{
      return strcmp(((const struct rule *) cp1)->r_name,
            ((const struct rule *) cp2)->r_name);
}

static void
associate P((void))
{
      register struct zone *  zp;
      register struct rule *  rp;
      register int            base, out;
      register 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)
            (void) exit(EXIT_FAILURE);
}

static void
infile(name)
const char *      name;
{
      register FILE *               fp;
      register char **        fields;
      register char *               cp;
      register const struct lookup *      lp;
      register int                  nfields;
      register int                  wantcont;
      register 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: Can't open %s: %s\n"),
                  progname, name, e);
            (void) 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"));
                  (void) 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);
                              (void) exit(EXIT_FAILURE);
                  }
            }
            ifree((char *) fields);
      }
      if (ferror(fp)) {
            (void) fprintf(stderr, _("%s: Error reading %s\n"),
                  progname, filename);
            (void) 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);
            (void) 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(string, errstring, signable)
const char *            string;
const char * const      errstring;
const int         signable;
{
      int   hh, 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, "%d"), &hh) == 1)
            mm = ss = 0;
      else if (sscanf(string, scheck(string, "%d:%d"), &hh, &mm) == 2)
            ss = 0;
      else if (sscanf(string, scheck(string, "%d:%d:%d"),
            &hh, &mm, &ss) != 3) {
                  error(errstring);
                  return 0;
      }
      if ((hh < 0 || hh >= HOURSPERDAY ||
            mm < 0 || mm >= MINSPERHOUR ||
            ss < 0 || ss > SECSPERMIN) &&
            !(hh == HOURSPERDAY && mm == 0 && ss == 0)) {
                  error(errstring);
                  return 0;
      }
      return eitol(sign) *
            (eitol(hh * MINSPERHOUR + mm) *
            eitol(SECSPERMIN) + eitol(ss));
}

static void
inrule(fields, nfields)
register char ** const  fields;
const 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]);
      rules = (struct rule *) (void *) erealloc((char *) rules,
            (int) ((nrules + 1) * sizeof *rules));
      rules[nrules++] = r;
}

static int
inzone(fields, nfields)
register char ** const  fields;
const int         nfields;
{
      register 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(fields, nfields)
register char ** const  fields;
const 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(fields, nfields, iscont)
register char ** const  fields;
const int         nfields;
const int         iscont;
{
      register char *         cp;
      static struct zone      z;
      register int            i_gmtoff, i_rule, i_format;
      register int            i_untilyear, i_untilmonth;
      register int            i_untilday, i_untiltime;
      register 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]);
      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(fields, nfields)
register char ** const  fields;
const int         nfields;
{
      register const char *         cp;
      register const struct lookup *      lp;
      register int                  i, j;
      int                     year, month, day;
      long                    dayoff, tod;
      time_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;
      }
      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 < 0 && !TYPE_SIGNED(time_t)) {
            error(_("time before zero"));
            return;
      }
      t = (time_t) dayoff * SECSPERDAY;
      /*
      ** Cheap overflow check.
      */
      if (t / SECSPERDAY != dayoff) {
            error(_("time overflow"));
            return;
      }
      tod = gethms(fields[LP_TIME], _("invalid time of day"), FALSE);
      cp = fields[LP_CORR];
      {
            register 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(fields, nfields)
register char ** const  fields;
const 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(rp, loyearp, hiyearp, typep, monthp, dayp, timep)
register struct rule * const  rp;
const char * const            loyearp;
const char * const            hiyearp;
const char * const            typep;
const char * const            monthp;
const char * const            dayp;
const char * const            timep;
{
      register const struct lookup *      lp;
      register const char *         cp;
      register char *               dp;
      register 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);
      if (lp != NULL) 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);
                  (void) exit(EXIT_FAILURE);
      } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_loyear) != 1) {
            error(_("invalid starting year"));
            return;
      } else if (noise) {
            if (rp->r_loyear < min_year_representable)
                  warning(_("starting year too low to be represented"));
            else if (rp->r_loyear > max_year_representable)
                  warning(_("starting year too high to be represented"));
      }
      cp = hiyearp;
      if ((lp = byword(cp, end_years)) != NULL) 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);
                  (void) exit(EXIT_FAILURE);
      } else if (sscanf(cp, scheck(cp, "%d"), &rp->r_hiyear) != 1) {
            error(_("invalid ending year"));
            return;
      } else if (noise) {
            if (rp->r_loyear < min_year_representable)
                  warning(_("starting year too low to be represented"));
            else if (rp->r_loyear > max_year_representable)
                  warning(_("starting year too high to be represented"));
      }
      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);
      }
      if (rp->r_loyear < min_year && rp->r_loyear > 0)
            min_year = rp->r_loyear;
      /*
      ** 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(val, buf)
const long  val;
char * const      buf;
{
      register int      i;
      register long     shift;

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

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

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

static int
atcomp(avp, bvp)
void *      avp;
void *      bvp;
{
      if (((struct attype *) avp)->at < ((struct attype *) bvp)->at)
            return -1;
      else if (((struct attype *) avp)->at > ((struct attype *) bvp)->at)
            return 1;
      else  return 0;
}

static void
writezone(name)
const char * const      name;
{
      register FILE *         fp;
      register int            i, j;
      static char *           fullname;
      static struct tzhead    tzh;
      time_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;
      }
      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: Can't remove %s: %s\n"),
                  progname, fullname, e);
            (void) 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: Can't create %s: %s\n"),
                        progname, fullname, e);
                  (void) exit(EXIT_FAILURE);
            }
      }
      convert(eitol(typecnt), tzh.tzh_ttisgmtcnt);
      convert(eitol(typecnt), tzh.tzh_ttisstdcnt);
      convert(eitol(leapcnt), tzh.tzh_leapcnt);
      convert(eitol(timecnt), tzh.tzh_timecnt);
      convert(eitol(typecnt), tzh.tzh_typecnt);
      convert(eitol(charcnt), tzh.tzh_charcnt);
      (void) strncpy(tzh.tzh_magic, TZ_MAGIC, sizeof tzh.tzh_magic);
#define DO(field) (void) fwrite((void *) tzh.field, (size_t) sizeof tzh.field, (size_t) 1, fp)
      DO(tzh_magic);
      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 = 0; i < timecnt; ++i) {
            j = leapcnt;
            while (--j >= 0)
                  if (ats[i] >= trans[j]) {
                        ats[i] = tadd(ats[i], corr[j]);
                        break;
                  }
            puttzcode((long) ats[i], fp);
      }
      if (timecnt > 0)
            (void) fwrite((void *) types, (size_t) sizeof types[0],
                  (size_t) timecnt, fp);
      for (i = 0; i < typecnt; ++i) {
            puttzcode((long) gmtoffs[i], fp);
            (void) putc(isdsts[i], fp);
            (void) putc(abbrinds[i], fp);
      }
      if (charcnt != 0)
            (void) fwrite((void *) chars, (size_t) sizeof chars[0],
                  (size_t) charcnt, fp);
      for (i = 0; i < leapcnt; ++i) {
            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];
                  }
                  puttzcode((long) tadd(trans[i], -gmtoffs[j]), fp);
            } else      puttzcode((long) trans[i], fp);
            puttzcode((long) corr[i], fp);
      }
      for (i = 0; i < typecnt; ++i)
            (void) putc(ttisstds[i], fp);
      for (i = 0; i < typecnt; ++i)
            (void) putc(ttisgmts[i], fp);
      if (ferror(fp) || fclose(fp)) {
            (void) fprintf(stderr, _("%s: Error writing %s\n"),
                  progname, fullname);
            (void) exit(EXIT_FAILURE);
      }
}

static void
doabbr(abbr, format, letters, isdst)
char * const            abbr;
const char * const      format;
const char * const      letters;
const int         isdst;
{
      if (strchr(format, '/') == NULL) {
            if (letters == NULL)
                  (void) strcpy(abbr, format);
            else  (void) sprintf(abbr, format, letters);
      } else if (isdst)
            (void) strcpy(abbr, strchr(format, '/') + 1);
      else {
            (void) strcpy(abbr, format);
            *strchr(abbr, '/') = '\0';
      }
}

static void
outzone(zpfirst, zonecount)
const struct zone * const     zpfirst;
const int               zonecount;
{
      register const struct zone *  zp;
      register struct rule *        rp;
      register int                  i, j;
      register int                  usestart, useuntil;
      register time_t               starttime, untiltime;
      register long                 gmtoff;
      register long                 stdoff;
      register int                  year;
      register long                 startoff;
      register int                  startttisstd;
      register int                  startttisgmt;
      register int                  type;
      char                    startbuf[BUFSIZ];

      INITIALIZE(untiltime);
      INITIALIZE(starttime);
      /*
      ** Now. . .finally. . .generate some useful data!
      */
      timecnt = 0;
      typecnt = 0;
      charcnt = 0;
      /*
      ** Thanks to Earl Chew (earl@dnd.icp.nec.com.au)
      ** for noting the need to unconditionally initialize startttisstd.
      */
      startttisstd = FALSE;
      startttisgmt = FALSE;
      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);
                  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 ( ; ; ) {
                        register int      k;
                        register time_t   jtime, ktime;
                        register long     offset;
                        char        buf[BUFSIZ];

                        INITIALIZE(ktime);
                        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);
                                    continue;
                              }
                              if (*startbuf == '\0' &&
                                  startoff == oadd(zp->z_gmtoff,
                                  stdoff)) {
                                    doabbr(startbuf, zp->z_format,
                                          rp->r_abbrvar,
                                          rp->r_stdoff != 0);
                              }
                        }
                        eats(zp->z_filename, zp->z_linenum,
                              rp->r_filename, rp->r_linenum);
                        doabbr(buf, zp->z_format, rp->r_abbrvar,
                              rp->r_stdoff != 0);
                        offset = oadd(zp->z_gmtoff, rp->r_stdoff);
                        type = addtype(offset, buf, 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(_("can't 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);
}

static void
addtt(starttime, type)
const time_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?!"));
            (void) exit(EXIT_FAILURE);
      }
      attypes[timecnt].at = starttime;
      attypes[timecnt].type = type;
      ++timecnt;
}

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

      if (isdst != TRUE && isdst != FALSE) {
            error(_("internal error - addtype called with bad isdst"));
            (void) exit(EXIT_FAILURE);
      }
      if (ttisstd != TRUE && ttisstd != FALSE) {
            error(_("internal error - addtype called with bad ttisstd"));
            (void) exit(EXIT_FAILURE);
      }
      if (ttisgmt != TRUE && ttisgmt != FALSE) {
            error(_("internal error - addtype called with bad ttisgmt"));
            (void) 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"));
            (void) 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(t, positive, rolling, count)
const time_t      t;
const int   positive;
const int   rolling;
int         count;
{
      register int      i, j;

      if (leapcnt + (positive ? count : 1) > TZ_MAX_LEAPS) {
            error(_("too many leap seconds"));
            (void) exit(EXIT_FAILURE);
      }
      for (i = 0; i < leapcnt; ++i)
            if (t <= trans[i]) {
                  if (t == trans[i]) {
                        error(_("repeated leap second moment"));
                        (void) 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 P((void))
{
      register int      i;
      register 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(year, type)
const int         year;
const char * const      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 ( ; ; )
            (void) exit(EXIT_FAILURE);
}

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

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

static int
itsabbr(abbr, word)
register const char *   abbr;
register 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(word, table)
register const char * const         word;
register const struct lookup * const      table;
{
      register const struct lookup *      foundlp;
      register 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(cp)
register char *   cp;
{
      register char *         dp;
      register char **  array;
      register int            nsubs;

      if (cp == NULL)
            return NULL;
      array = (char **) (void *)
            emalloc((int) ((strlen(cp) + 1) * sizeof *array));
      nsubs = 0;
      for ( ; ; ) {
            while (isascii(*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"));
            } 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(t1, t2)
const long  t1;
const long  t2;
{
      register long     t;

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

static time_t
tadd(t1, t2)
const time_t      t1;
const long  t2;
{
      register time_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"));
            (void) 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 time_t
rpytime(rp, wantedy)
register const struct rule * const  rp;
register const int                  wantedy;
{
      register int      y, m, i;
      register long     dayoff;                 /* with a nod to Margaret O. */
      register time_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"));
                  (void) exit(EXIT_FAILURE);
            }
      }
      --i;
      dayoff = oadd(dayoff, eitol(i));
      if (rp->r_dycode == DC_DOWGEQ || rp->r_dycode == DC_DOWLEQ) {
            register 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]) {
                  error(_("no day in month matches rule"));
                  (void) exit(EXIT_FAILURE);
            }
      }
      if (dayoff < 0 && !TYPE_SIGNED(time_t))
            return min_time;
      t = (time_t) dayoff * SECSPERDAY;
      /*
      ** Cheap overflow check.
      */
      if (t / SECSPERDAY != dayoff)
            return (dayoff > 0) ? max_time : min_time;
      return tadd(t, rp->r_tod);
}

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

      i = strlen(string) + 1;
      if (charcnt + i > TZ_MAX_CHARS) {
            error(_("too many, or too long, time zone abbreviations"));
            (void) exit(EXIT_FAILURE);
      }
      (void) strcpy(&chars[charcnt], string);
      charcnt += eitol(i);
}

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

      if (argname == NULL || *argname == '\0')
            return 0;
      cp = name = ecpyalloc(argname);
      while ((cp = strchr(cp + 1, '/')) != 0) {
            *cp = '\0';
#ifndef unix
            /*
            ** DOS drive specifier?
            */
            if (isalpha((unsigned char) name[0]) &&
                  name[1] == ':' && name[2] == '\0') {
                        *cp = '/';
                        continue;
            }
#endif /* !defined unix */
            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: Can't create directory %s: %s\n"),
                                    progname, name, e);
                              ifree(name);
                              return -1;
                        }
                  }
            }
            *cp = '/';
      }
      ifree(name);
      return 0;
}

static long
eitol(i)
const 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);
            (void) exit(EXIT_FAILURE);
      }
      return l;
}

/*
** UNIX was a registered trademark of UNIX System Laboratories in 1993.
*/

Generated by  Doxygen 1.6.0   Back to index