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tclDate.c

/* 
 * tclDate.c --
 *
 *    This file is generated from a yacc grammar defined in
 *    the file tclGetDate.y.  It should not be edited directly.
 *
 * Copyright (c) 1992-1995 Karl Lehenbauer and Mark Diekhans.
 * Copyright (c) 1995-1997 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tclDate.c,v 1.20.4.2 2005/11/04 20:15:09 kennykb Exp $
 */

#include "tclInt.h"
#include "tclPort.h"

#if defined(MAC_TCL) && !defined(TCL_MAC_USE_MSL_EPOCH)
#   define EPOCH           1904
#   define START_OF_TIME   1904
#   define END_OF_TIME     2039
#else
#   define EPOCH           1970
#   define START_OF_TIME   1902
#   define END_OF_TIME     2037
#endif

/*
 * The offset of tm_year of struct tm returned by localtime, gmtime, etc.
 * I don't know how universal this is; K&R II, the NetBSD manpages, and
 * ../compat/strftime.c all agree that tm_year is the year-1900.  However,
 * some systems may have a different value.  This #define should be the
 * same as in ../compat/strftime.c.
 */
#define TM_YEAR_BASE 1900

#define HOUR(x)         ((int) (60 * x))
#define SECSPERDAY      (24L * 60L * 60L)
#define IsLeapYear(x)   ((x % 4 == 0) && (x % 100 != 0 || x % 400 == 0))

/*
 *  An entry in the lexical lookup table.
 */
typedef struct _TABLE {
    char        *name;
    int         type;
    time_t      value;
} TABLE;


/*
 *  Daylight-savings mode:  on, off, or not yet known.
 */
typedef enum _DSTMODE {
    DSTon, DSToff, DSTmaybe
} DSTMODE;

/*
 *  Meridian:  am, pm, or 24-hour style.
 */
typedef enum _MERIDIAN {
    MERam, MERpm, MER24
} MERIDIAN;


/*
 *  Global variables.  We could get rid of most of these by using a good
 *  union as the yacc stack.  (This routine was originally written before
 *  yacc had the %union construct.)  Maybe someday; right now we only use
 *  the %union very rarely.
 */
static char     *TclDateInput;
static DSTMODE  TclDateDSTmode;
static time_t   TclDateDayOrdinal;
static time_t   TclDateDayNumber;
static time_t   TclDateMonthOrdinal;
static int      TclDateHaveDate;
static int      TclDateHaveDay;
static int      TclDateHaveOrdinalMonth;
static int      TclDateHaveRel;
static int      TclDateHaveTime;
static int      TclDateHaveZone;
static time_t   TclDateTimezone;
static time_t   TclDateDay;
static time_t   TclDateHour;
static time_t   TclDateMinutes;
static time_t   TclDateMonth;
static time_t   TclDateSeconds;
static time_t   TclDateYear;
static MERIDIAN TclDateMeridian;
static time_t   TclDateRelMonth;
static time_t   TclDateRelDay;
static time_t   TclDateRelSeconds;
static time_t  *TclDateRelPointer;

/*
 * Prototypes of internal functions.
 */
static void TclDateerror _ANSI_ARGS_((char *s));
static time_t     ToSeconds _ANSI_ARGS_((time_t Hours, time_t Minutes,
                time_t Seconds, MERIDIAN Meridian));
static int  Convert _ANSI_ARGS_((time_t Month, time_t Day, time_t Year,
                time_t Hours, time_t Minutes, time_t Seconds,
                MERIDIAN Meridia, DSTMODE DSTmode, time_t *TimePtr));
static time_t     DSTcorrect _ANSI_ARGS_((time_t Start, time_t Future));
static time_t     NamedDay _ANSI_ARGS_((time_t Start, time_t DayOrdinal,
                time_t DayNumber));
static time_t   NamedMonth _ANSI_ARGS_((time_t Start, time_t MonthOrdinal,
                    time_t MonthNumber));
static int  RelativeMonth _ANSI_ARGS_((time_t Start, time_t RelMonth,
                time_t *TimePtr));
static int  RelativeDay _ANSI_ARGS_((time_t Start, time_t RelDay,
                time_t *TimePtr));
static int  LookupWord _ANSI_ARGS_((char *buff));
static int  TclDatelex _ANSI_ARGS_((void));

int
TclDateparse _ANSI_ARGS_((void));
typedef union
#ifdef __cplusplus
      YYSTYPE
#endif
 {
    time_t              Number;
    enum _MERIDIAN      Meridian;
} YYSTYPE;
# define tAGO 257
# define tDAY 258
# define tDAYZONE 259
# define tID 260
# define tMERIDIAN 261
# define tMINUTE_UNIT 262
# define tMONTH 263
# define tMONTH_UNIT 264
# define tSTARDATE 265
# define tSEC_UNIT 266
# define tSNUMBER 267
# define tUNUMBER 268
# define tZONE 269
# define tEPOCH 270
# define tDST 271
# define tISOBASE 272
# define tDAY_UNIT 273
# define tNEXT 274




#if defined(__cplusplus) || defined(__STDC__)

#if defined(__cplusplus) && defined(__EXTERN_C__)
extern "C" {
#endif
#ifndef TclDateerror
#if defined(__cplusplus)
      void TclDateerror(CONST char *);
#endif
#endif
#ifndef TclDatelex
      int TclDatelex(void);
#endif
      int TclDateparse(void);
#if defined(__cplusplus) && defined(__EXTERN_C__)
}
#endif

#endif

#define TclDateclearin TclDatechar = -1
#define TclDateerrok TclDateerrflag = 0
extern int TclDatechar;
extern int TclDateerrflag;
YYSTYPE TclDatelval;
YYSTYPE TclDateval;
typedef int TclDatetabelem;
#ifndef YYMAXDEPTH
#define YYMAXDEPTH 150
#endif
#if YYMAXDEPTH > 0
int TclDate_TclDates[YYMAXDEPTH], *TclDates = TclDate_TclDates;
YYSTYPE TclDate_TclDatev[YYMAXDEPTH], *TclDatev = TclDate_TclDatev;
#else /* user does initial allocation */
int *TclDates;
YYSTYPE *TclDatev;
#endif
static int TclDatemaxdepth = YYMAXDEPTH;
# define YYERRCODE 256


/*
 * Month and day table.
 */
static TABLE    MonthDayTable[] = {
    { "january",        tMONTH,  1 },
    { "february",       tMONTH,  2 },
    { "march",          tMONTH,  3 },
    { "april",          tMONTH,  4 },
    { "may",            tMONTH,  5 },
    { "june",           tMONTH,  6 },
    { "july",           tMONTH,  7 },
    { "august",         tMONTH,  8 },
    { "september",      tMONTH,  9 },
    { "sept",           tMONTH,  9 },
    { "october",        tMONTH, 10 },
    { "november",       tMONTH, 11 },
    { "december",       tMONTH, 12 },
    { "sunday",         tDAY, 0 },
    { "monday",         tDAY, 1 },
    { "tuesday",        tDAY, 2 },
    { "tues",           tDAY, 2 },
    { "wednesday",      tDAY, 3 },
    { "wednes",         tDAY, 3 },
    { "thursday",       tDAY, 4 },
    { "thur",           tDAY, 4 },
    { "thurs",          tDAY, 4 },
    { "friday",         tDAY, 5 },
    { "saturday",       tDAY, 6 },
    { NULL }
};

/*
 * Time units table.
 */
static TABLE    UnitsTable[] = {
    { "year",           tMONTH_UNIT,    12 },
    { "month",          tMONTH_UNIT,     1 },
    { "fortnight",      tDAY_UNIT,      14 },
    { "week",           tDAY_UNIT,       7 },
    { "day",            tDAY_UNIT,       1 },
    { "hour",           tSEC_UNIT, 60 * 60 },
    { "minute",         tSEC_UNIT,      60 },
    { "min",            tSEC_UNIT,      60 },
    { "second",         tSEC_UNIT,       1 },
    { "sec",            tSEC_UNIT,       1 },
    { NULL }
};

/*
 * Assorted relative-time words.
 */
static TABLE    OtherTable[] = {
    { "tomorrow",       tDAY_UNIT,      1 },
    { "yesterday",      tDAY_UNIT,     -1 },
    { "today",          tDAY_UNIT,      0 },
    { "now",            tSEC_UNIT,      0 },
    { "last",           tUNUMBER,      -1 },
    { "this",           tSEC_UNIT,      0 },
    { "next",           tNEXT,          1 },
#if 0
    { "first",          tUNUMBER,       1 },
    { "second",         tUNUMBER,       2 },
    { "third",          tUNUMBER,       3 },
    { "fourth",         tUNUMBER,       4 },
    { "fifth",          tUNUMBER,       5 },
    { "sixth",          tUNUMBER,       6 },
    { "seventh",        tUNUMBER,       7 },
    { "eighth",         tUNUMBER,       8 },
    { "ninth",          tUNUMBER,       9 },
    { "tenth",          tUNUMBER,       10 },
    { "eleventh",       tUNUMBER,       11 },
    { "twelfth",        tUNUMBER,       12 },
#endif
    { "ago",            tAGO,   1 },
    { "epoch",          tEPOCH,   0 },
    { "stardate",       tSTARDATE, 0},
    { NULL }
};

/*
 * The timezone table.  (Note: This table was modified to not use any floating
 * point constants to work around an SGI compiler bug).
 */
static TABLE    TimezoneTable[] = {
    { "gmt",    tZONE,     HOUR( 0) },      /* Greenwich Mean */
    { "ut",     tZONE,     HOUR( 0) },      /* Universal (Coordinated) */
    { "utc",    tZONE,     HOUR( 0) },
    { "uct",    tZONE,     HOUR( 0) },      /* Universal Coordinated Time */
    { "wet",    tZONE,     HOUR( 0) },      /* Western European */
    { "bst",    tDAYZONE,  HOUR( 0) },      /* British Summer */
    { "wat",    tZONE,     HOUR( 1) },      /* West Africa */
    { "at",     tZONE,     HOUR( 2) },      /* Azores */
#if     0
    /* For completeness.  BST is also British Summer, and GST is
     * also Guam Standard. */
    { "bst",    tZONE,     HOUR( 3) },      /* Brazil Standard */
    { "gst",    tZONE,     HOUR( 3) },      /* Greenland Standard */
#endif
    { "nft",    tZONE,     HOUR( 7/2) },    /* Newfoundland */
    { "nst",    tZONE,     HOUR( 7/2) },    /* Newfoundland Standard */
    { "ndt",    tDAYZONE,  HOUR( 7/2) },    /* Newfoundland Daylight */
    { "ast",    tZONE,     HOUR( 4) },      /* Atlantic Standard */
    { "adt",    tDAYZONE,  HOUR( 4) },      /* Atlantic Daylight */
    { "est",    tZONE,     HOUR( 5) },      /* Eastern Standard */
    { "edt",    tDAYZONE,  HOUR( 5) },      /* Eastern Daylight */
    { "cst",    tZONE,     HOUR( 6) },      /* Central Standard */
    { "cdt",    tDAYZONE,  HOUR( 6) },      /* Central Daylight */
    { "mst",    tZONE,     HOUR( 7) },      /* Mountain Standard */
    { "mdt",    tDAYZONE,  HOUR( 7) },      /* Mountain Daylight */
    { "pst",    tZONE,     HOUR( 8) },      /* Pacific Standard */
    { "pdt",    tDAYZONE,  HOUR( 8) },      /* Pacific Daylight */
    { "yst",    tZONE,     HOUR( 9) },      /* Yukon Standard */
    { "ydt",    tDAYZONE,  HOUR( 9) },      /* Yukon Daylight */
    { "hst",    tZONE,     HOUR(10) },      /* Hawaii Standard */
    { "hdt",    tDAYZONE,  HOUR(10) },      /* Hawaii Daylight */
    { "cat",    tZONE,     HOUR(10) },      /* Central Alaska */
    { "ahst",   tZONE,     HOUR(10) },      /* Alaska-Hawaii Standard */
    { "nt",     tZONE,     HOUR(11) },      /* Nome */
    { "idlw",   tZONE,     HOUR(12) },      /* International Date Line West */
    { "cet",    tZONE,    -HOUR( 1) },      /* Central European */
    { "cest",   tDAYZONE, -HOUR( 1) },      /* Central European Summer */
    { "met",    tZONE,    -HOUR( 1) },      /* Middle European */
    { "mewt",   tZONE,    -HOUR( 1) },      /* Middle European Winter */
    { "mest",   tDAYZONE, -HOUR( 1) },      /* Middle European Summer */
    { "swt",    tZONE,    -HOUR( 1) },      /* Swedish Winter */
    { "sst",    tDAYZONE, -HOUR( 1) },      /* Swedish Summer */
    { "fwt",    tZONE,    -HOUR( 1) },      /* French Winter */
    { "fst",    tDAYZONE, -HOUR( 1) },      /* French Summer */
    { "eet",    tZONE,    -HOUR( 2) },      /* Eastern Europe, USSR Zone 1 */
    { "bt",     tZONE,    -HOUR( 3) },      /* Baghdad, USSR Zone 2 */
    { "it",     tZONE,    -HOUR( 7/2) },    /* Iran */
    { "zp4",    tZONE,    -HOUR( 4) },      /* USSR Zone 3 */
    { "zp5",    tZONE,    -HOUR( 5) },      /* USSR Zone 4 */
    { "ist",    tZONE,    -HOUR(11/2) },    /* Indian Standard */
    { "zp6",    tZONE,    -HOUR( 6) },      /* USSR Zone 5 */
#if     0
    /* For completeness.  NST is also Newfoundland Stanard, nad SST is
     * also Swedish Summer. */
    { "nst",    tZONE,    -HOUR(13/2) },    /* North Sumatra */
    { "sst",    tZONE,    -HOUR( 7) },      /* South Sumatra, USSR Zone 6 */
#endif  /* 0 */
    { "wast",   tZONE,    -HOUR( 7) },      /* West Australian Standard */
    { "wadt",   tDAYZONE, -HOUR( 7) },      /* West Australian Daylight */
    { "jt",     tZONE,    -HOUR(15/2) },    /* Java (3pm in Cronusland!) */
    { "cct",    tZONE,    -HOUR( 8) },      /* China Coast, USSR Zone 7 */
    { "jst",    tZONE,    -HOUR( 9) },      /* Japan Standard, USSR Zone 8 */
    { "jdt",    tDAYZONE, -HOUR( 9) },      /* Japan Daylight */
    { "kst",    tZONE,    -HOUR( 9) },      /* Korea Standard */
    { "kdt",    tDAYZONE, -HOUR( 9) },      /* Korea Daylight */
    { "cast",   tZONE,    -HOUR(19/2) },    /* Central Australian Standard */
    { "cadt",   tDAYZONE, -HOUR(19/2) },    /* Central Australian Daylight */
    { "east",   tZONE,    -HOUR(10) },      /* Eastern Australian Standard */
    { "eadt",   tDAYZONE, -HOUR(10) },      /* Eastern Australian Daylight */
    { "gst",    tZONE,    -HOUR(10) },      /* Guam Standard, USSR Zone 9 */
    { "nzt",    tZONE,    -HOUR(12) },      /* New Zealand */
    { "nzst",   tZONE,    -HOUR(12) },      /* New Zealand Standard */
    { "nzdt",   tDAYZONE, -HOUR(12) },      /* New Zealand Daylight */
    { "idle",   tZONE,    -HOUR(12) },      /* International Date Line East */
    /* ADDED BY Marco Nijdam */
    { "dst",    tDST,     HOUR( 0) },       /* DST on (hour is ignored) */
    /* End ADDED */
    {  NULL  }
};

/*
 * Military timezone table.
 */
static TABLE    MilitaryTable[] = {
    { "a",      tZONE,  HOUR(  1) },
    { "b",      tZONE,  HOUR(  2) },
    { "c",      tZONE,  HOUR(  3) },
    { "d",      tZONE,  HOUR(  4) },
    { "e",      tZONE,  HOUR(  5) },
    { "f",      tZONE,  HOUR(  6) },
    { "g",      tZONE,  HOUR(  7) },
    { "h",      tZONE,  HOUR(  8) },
    { "i",      tZONE,  HOUR(  9) },
    { "k",      tZONE,  HOUR( 10) },
    { "l",      tZONE,  HOUR( 11) },
    { "m",      tZONE,  HOUR( 12) },
    { "n",      tZONE,  HOUR(- 1) },
    { "o",      tZONE,  HOUR(- 2) },
    { "p",      tZONE,  HOUR(- 3) },
    { "q",      tZONE,  HOUR(- 4) },
    { "r",      tZONE,  HOUR(- 5) },
    { "s",      tZONE,  HOUR(- 6) },
    { "t",      tZONE,  HOUR(- 7) },
    { "u",      tZONE,  HOUR(- 8) },
    { "v",      tZONE,  HOUR(- 9) },
    { "w",      tZONE,  HOUR(-10) },
    { "x",      tZONE,  HOUR(-11) },
    { "y",      tZONE,  HOUR(-12) },
    { "z",      tZONE,  HOUR(  0) },
    { NULL }
};


/*
 * Dump error messages in the bit bucket.
 */
static void
TclDateerror(s)
    char  *s;
{
}


static time_t
ToSeconds(Hours, Minutes, Seconds, Meridian)
    time_t      Hours;
    time_t      Minutes;
    time_t      Seconds;
    MERIDIAN    Meridian;
{
    if (Minutes < 0 || Minutes > 59 || Seconds < 0 || Seconds > 59)
        return -1;
    switch (Meridian) {
    case MER24:
        if (Hours < 0 || Hours > 23)
            return -1;
        return (Hours * 60L + Minutes) * 60L + Seconds;
    case MERam:
        if (Hours < 1 || Hours > 12)
            return -1;
        return ((Hours % 12) * 60L + Minutes) * 60L + Seconds;
    case MERpm:
        if (Hours < 1 || Hours > 12)
            return -1;
        return (((Hours % 12) + 12) * 60L + Minutes) * 60L + Seconds;
    }
    return -1;  /* Should never be reached */
}

/*
 *-----------------------------------------------------------------------------
 *
 * Convert --
 *
 *      Convert a {month, day, year, hours, minutes, seconds, meridian, dst}
 *      tuple into a clock seconds value.
 *
 * Results:
 *      0 or -1 indicating success or failure.
 *
 * Side effects:
 *      Fills TimePtr with the computed value.
 *
 *-----------------------------------------------------------------------------
 */
static int
Convert(Month, Day, Year, Hours, Minutes, Seconds, Meridian, DSTmode, TimePtr)
    time_t      Month;
    time_t      Day;
    time_t      Year;
    time_t      Hours;
    time_t      Minutes;
    time_t      Seconds;
    MERIDIAN    Meridian;
    DSTMODE     DSTmode;
    time_t     *TimePtr;
{
    static int  DaysInMonth[12] = {
        31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
    };
    time_t tod;
    time_t Julian;
    int i;

    /* Figure out how many days are in February for the given year.
     * Every year divisible by 4 is a leap year.
     * But, every year divisible by 100 is not a leap year.
     * But, every year divisible by 400 is a leap year after all.
     */
    DaysInMonth[1] = IsLeapYear(Year) ? 29 : 28;

    /* Check the inputs for validity */
    if (Month < 1 || Month > 12
          || Year < START_OF_TIME || Year > END_OF_TIME
          || Day < 1 || Day > DaysInMonth[(int)--Month])
        return -1;

    /* Start computing the value.  First determine the number of days
     * represented by the date, then multiply by the number of seconds/day.
     */
    for (Julian = Day - 1, i = 0; i < Month; i++)
        Julian += DaysInMonth[i];
    if (Year >= EPOCH) {
        for (i = EPOCH; i < Year; i++)
            Julian += 365 + IsLeapYear(i);
    } else {
        for (i = Year; i < EPOCH; i++)
            Julian -= 365 + IsLeapYear(i);
    }
    Julian *= SECSPERDAY;

    /* Add the timezone offset ?? */
    Julian += TclDateTimezone * 60L;

    /* Add the number of seconds represented by the time component */
    if ((tod = ToSeconds(Hours, Minutes, Seconds, Meridian)) < 0)
        return -1;
    Julian += tod;

    /* Perform a preliminary DST compensation ?? */
    if (DSTmode == DSTon
     || (DSTmode == DSTmaybe && TclpGetDate((TclpTime_t)&Julian, 0)->tm_isdst))
        Julian -= 60 * 60;
    *TimePtr = Julian;
    return 0;
}


static time_t
DSTcorrect(Start, Future)
    time_t      Start;
    time_t      Future;
{
    time_t      StartDay;
    time_t      FutureDay;
    StartDay = (TclpGetDate((TclpTime_t)&Start, 0)->tm_hour + 1) % 24;
    FutureDay = (TclpGetDate((TclpTime_t)&Future, 0)->tm_hour + 1) % 24;
    return (Future - Start) + (StartDay - FutureDay) * 60L * 60L;
}


static time_t
NamedDay(Start, DayOrdinal, DayNumber)
    time_t      Start;
    time_t      DayOrdinal;
    time_t      DayNumber;
{
    struct tm   *tm;
    time_t      now;

    now = Start;
    tm = TclpGetDate((TclpTime_t)&now, 0);
    now += SECSPERDAY * ((DayNumber - tm->tm_wday + 7) % 7);
    now += 7 * SECSPERDAY * (DayOrdinal <= 0 ? DayOrdinal : DayOrdinal - 1);
    return DSTcorrect(Start, now);
}

static time_t
NamedMonth(Start, MonthOrdinal, MonthNumber)
    time_t Start;
    time_t MonthOrdinal;
    time_t MonthNumber;
{
    struct tm *tm;
    time_t now;
    int result;
    
    now = Start;
    tm = TclpGetDate((TclpTime_t)&now, 0);
    /* To compute the next n'th month, we use this alg:
     * add n to year value
     * if currentMonth < requestedMonth decrement year value by 1 (so that
     *  doing next february from january gives us february of the current year)
     * set day to 1, time to 0
     */
    tm->tm_year += MonthOrdinal;
    if (tm->tm_mon < MonthNumber - 1) {
      tm->tm_year--;
    }
    result = Convert(MonthNumber, (time_t) 1, tm->tm_year + TM_YEAR_BASE,
          (time_t) 0, (time_t) 0, (time_t) 0, MER24, DSTmaybe, &now);
    if (result < 0) {
      return 0;
    }
    return DSTcorrect(Start, now);
}

static int
RelativeMonth(Start, RelMonth, TimePtr)
    time_t Start;
    time_t RelMonth;
    time_t *TimePtr;
{
    struct tm *tm;
    time_t Month;
    time_t Year;
    time_t Julian;
    int result;

    if (RelMonth == 0) {
        *TimePtr = 0;
        return 0;
    }
    tm = TclpGetDate((TclpTime_t)&Start, 0);
    Month = 12 * (tm->tm_year + TM_YEAR_BASE) + tm->tm_mon + RelMonth;
    Year = Month / 12;
    Month = Month % 12 + 1;
    result = Convert(Month, (time_t) tm->tm_mday, Year,
          (time_t) tm->tm_hour, (time_t) tm->tm_min, (time_t) tm->tm_sec,
          MER24, DSTmaybe, &Julian);

    /*
     * The Julian time returned above is behind by one day, if "month" 
     * or "year" is used to specify relative time and the GMT flag is true.
     * This problem occurs only when the current time is closer to
     * midnight, the difference being not more than its time difference
     * with GMT. For example, in US/Pacific time zone, the problem occurs
     * whenever the current time is between midnight to 8:00am or 7:00amDST.
     * See Bug# 413397 for more details and sample script.
     * To resolve this bug, we simply add the number of seconds corresponding
     * to timezone difference with GMT to Julian time, if GMT flag is true.
     */

    if (TclDateTimezone == 0) {
        Julian += TclpGetTimeZone((unsigned long) Start) * 60L;
    }

    /*
     * The following iteration takes into account the case were we jump
     * into a "short month".  Far example, "one month from Jan 31" will
     * fail because there is no Feb 31.  The code below will reduce the
     * day and try converting the date until we succed or the date equals
     * 28 (which always works unless the date is bad in another way).
     */

    while ((result != 0) && (tm->tm_mday > 28)) {
      tm->tm_mday--;
      result = Convert(Month, (time_t) tm->tm_mday, Year,
            (time_t) tm->tm_hour, (time_t) tm->tm_min, (time_t) tm->tm_sec,
            MER24, DSTmaybe, &Julian);
    }
    if (result != 0) {
      return -1;
    }
    *TimePtr = DSTcorrect(Start, Julian);
    return 0;
}


/*
 *-----------------------------------------------------------------------------
 *
 * RelativeDay --
 *
 *      Given a starting time and a number of days before or after, compute the
 *      DST corrected difference between those dates.
 *
 * Results:
 *     1 or -1 indicating success or failure.
 *
 * Side effects:
 *      Fills TimePtr with the computed value.
 *
 *-----------------------------------------------------------------------------
 */

static int
RelativeDay(Start, RelDay, TimePtr)
    time_t Start;
    time_t RelDay;
    time_t *TimePtr;
{
    time_t new;

    new = Start + (RelDay * 60 * 60 * 24);
    *TimePtr = DSTcorrect(Start, new);
    return 1;
}

static int
LookupWord(buff)
    char                *buff;
{
    register char *p;
    register char *q;
    register TABLE *tp;
    int i;
    int abbrev;

    /*
     * Make it lowercase.
     */

    Tcl_UtfToLower(buff);

    if (strcmp(buff, "am") == 0 || strcmp(buff, "a.m.") == 0) {
        TclDatelval.Meridian = MERam;
        return tMERIDIAN;
    }
    if (strcmp(buff, "pm") == 0 || strcmp(buff, "p.m.") == 0) {
        TclDatelval.Meridian = MERpm;
        return tMERIDIAN;
    }

    /*
     * See if we have an abbreviation for a month.
     */
    if (strlen(buff) == 3) {
        abbrev = 1;
    } else if (strlen(buff) == 4 && buff[3] == '.') {
        abbrev = 1;
        buff[3] = '\0';
    } else {
        abbrev = 0;
    }

    for (tp = MonthDayTable; tp->name; tp++) {
        if (abbrev) {
            if (strncmp(buff, tp->name, 3) == 0) {
                TclDatelval.Number = tp->value;
                return tp->type;
            }
        } else if (strcmp(buff, tp->name) == 0) {
            TclDatelval.Number = tp->value;
            return tp->type;
        }
    }

    for (tp = TimezoneTable; tp->name; tp++) {
        if (strcmp(buff, tp->name) == 0) {
            TclDatelval.Number = tp->value;
            return tp->type;
        }
    }

    for (tp = UnitsTable; tp->name; tp++) {
        if (strcmp(buff, tp->name) == 0) {
            TclDatelval.Number = tp->value;
            return tp->type;
        }
    }

    /*
     * Strip off any plural and try the units table again.
     */
    i = strlen(buff) - 1;
    if (buff[i] == 's') {
        buff[i] = '\0';
        for (tp = UnitsTable; tp->name; tp++) {
            if (strcmp(buff, tp->name) == 0) {
                TclDatelval.Number = tp->value;
                return tp->type;
            }
      }
    }

    for (tp = OtherTable; tp->name; tp++) {
        if (strcmp(buff, tp->name) == 0) {
            TclDatelval.Number = tp->value;
            return tp->type;
        }
    }

    /*
     * Military timezones.
     */
    if (buff[1] == '\0' && !(*buff & 0x80)
          && isalpha(UCHAR(*buff))) {     /* INTL: ISO only */
        for (tp = MilitaryTable; tp->name; tp++) {
            if (strcmp(buff, tp->name) == 0) {
                TclDatelval.Number = tp->value;
                return tp->type;
            }
      }
    }

    /*
     * Drop out any periods and try the timezone table again.
     */
    for (i = 0, p = q = buff; *q; q++)
        if (*q != '.') {
            *p++ = *q;
        } else {
            i++;
      }
    *p = '\0';
    if (i) {
        for (tp = TimezoneTable; tp->name; tp++) {
            if (strcmp(buff, tp->name) == 0) {
                TclDatelval.Number = tp->value;
                return tp->type;
            }
      }
    }
    
    return tID;
}


static int
TclDatelex()
{
    register char       c;
    register char       *p;
    char                buff[20];
    int                 Count;

    for ( ; ; ) {
        while (isspace(UCHAR(*TclDateInput))) {
            TclDateInput++;
      }

        if (isdigit(UCHAR(c = *TclDateInput))) { /* INTL: digit */
          /* convert the string into a number; count the number of digits */
          Count = 0;
            for (TclDatelval.Number = 0;
                isdigit(UCHAR(c = *TclDateInput++)); ) { /* INTL: digit */
                TclDatelval.Number = 10 * TclDatelval.Number + c - '0';
            Count++;
          }
            TclDateInput--;
          /* A number with 6 or more digits is considered an ISO 8601 base */
          if (Count >= 6) {
            return tISOBASE;
          } else {
            return tUNUMBER;
          }
        }
        if (!(c & 0x80) && isalpha(UCHAR(c))) { /* INTL: ISO only. */
            for (p = buff; isalpha(UCHAR(c = *TclDateInput++)) /* INTL: ISO only. */
                 || c == '.'; ) {
                if (p < &buff[sizeof buff - 1]) {
                    *p++ = c;
            }
          }
            *p = '\0';
            TclDateInput--;
            return LookupWord(buff);
        }
        if (c != '(') {
            return *TclDateInput++;
      }
        Count = 0;
        do {
            c = *TclDateInput++;
            if (c == '\0') {
                return c;
          } else if (c == '(') {
                Count++;
          } else if (c == ')') {
                Count--;
          }
        } while (Count > 0);
    }
}

/*
 * Specify zone is of -50000 to force GMT.  (This allows BST to work).
 */

int
TclGetDate(p, now, zone, timePtr)
    char *p;
    Tcl_WideInt now;
    long zone;
    Tcl_WideInt *timePtr;
{
    struct tm *tm;
    time_t Start;
    time_t Time;
    time_t tod;
    int thisyear;

    TclDateInput = p;
    /* now has to be cast to a time_t for 64bit compliance */
    Start = (time_t) now;
    tm = TclpGetDate((TclpTime_t) &Start, (zone == -50000));
    thisyear = tm->tm_year + TM_YEAR_BASE;
    TclDateYear = thisyear;
    TclDateMonth = tm->tm_mon + 1;
    TclDateDay = tm->tm_mday;
    TclDateTimezone = zone;
    if (zone == -50000) {
        TclDateDSTmode = DSToff;  /* assume GMT */
        TclDateTimezone = 0;
    } else {
        TclDateDSTmode = DSTmaybe;
    }
    TclDateHour = 0;
    TclDateMinutes = 0;
    TclDateSeconds = 0;
    TclDateMeridian = MER24;
    TclDateRelSeconds = 0;
    TclDateRelMonth = 0;
    TclDateRelDay = 0;
    TclDateRelPointer = NULL;

    TclDateHaveDate = 0;
    TclDateHaveDay = 0;
    TclDateHaveOrdinalMonth = 0;
    TclDateHaveRel = 0;
    TclDateHaveTime = 0;
    TclDateHaveZone = 0;

    if (TclDateparse() || TclDateHaveTime > 1 || TclDateHaveZone > 1 || TclDateHaveDate > 1 ||
          TclDateHaveDay > 1 || TclDateHaveOrdinalMonth > 1) {
        return -1;
    }
    
    if (TclDateHaveDate || TclDateHaveTime || TclDateHaveDay) {
      if (TclDateYear < 0) {
          TclDateYear = -TclDateYear;
      }
      /*
       * The following line handles years that are specified using
       * only two digits.  The line of code below implements a policy
       * defined by the X/Open workgroup on the millinium rollover.
       * Note: some of those dates may not actually be valid on some
       * platforms.  The POSIX standard startes that the dates 70-99
       * shall refer to 1970-1999 and 00-38 shall refer to 2000-2038.
       * This later definition should work on all platforms.
       */

      if (TclDateYear < 100) {
          if (TclDateYear >= 69) {
            TclDateYear += 1900;
          } else {
            TclDateYear += 2000;
          }
      }
      if (Convert(TclDateMonth, TclDateDay, TclDateYear, TclDateHour, TclDateMinutes, TclDateSeconds,
            TclDateMeridian, TclDateDSTmode, &Start) < 0) {
            return -1;
      }
    } else {
        Start = (time_t) now;
        if (!TclDateHaveRel) {
            Start -= ((tm->tm_hour * 60L * 60L) +
                tm->tm_min * 60L) + tm->tm_sec;
      }
    }

    Start += TclDateRelSeconds;
    if (RelativeMonth(Start, TclDateRelMonth, &Time) < 0) {
        return -1;
    }
    Start += Time;

    if (RelativeDay(Start, TclDateRelDay, &Time) < 0) {
      return -1;
    }
    Start += Time;
    
    if (TclDateHaveDay && !TclDateHaveDate) {
        tod = NamedDay(Start, TclDateDayOrdinal, TclDateDayNumber);
        Start += tod;
    }

    if (TclDateHaveOrdinalMonth) {
      tod = NamedMonth(Start, TclDateMonthOrdinal, TclDateMonth);
      Start += tod;
    }
    
    *timePtr = Start;
    return 0;
}
static CONST TclDatetabelem TclDateexca[] ={
-1, 1,
      0, -1,
      -2, 0,
      };
# define YYNPROD 56
# define YYLAST 261
static CONST TclDatetabelem TclDateact[]={

    24,    40,    23,    36,    54,    81,    41,    28,    53,    26,
    37,    42,    58,    38,    56,    28,    27,    26,    28,    33,
    26,    32,    61,    50,    27,    80,    76,    27,    51,    75,
    74,    73,    30,    72,    71,    70,    69,    52,    49,    48,
    47,    45,    39,    62,    78,    46,    79,    68,    25,    65,
    60,    67,    66,    55,    44,    21,    63,    11,    10,     9,
     8,    35,     7,     6,     5,     4,     3,    43,     2,     1,
    20,     0,     0,     0,     0,     0,     0,     0,     0,     0,
     0,     0,     0,     0,     0,     0,     0,     0,     0,     0,
     0,    57,     0,     0,    59,    77,     0,     0,     0,     0,
     0,     0,     0,     0,     0,     0,     0,     0,     0,     0,
     0,     0,     0,     0,     0,     0,     0,     0,     0,     0,
     0,     0,     0,     0,     0,     0,     0,     0,     0,     0,
     0,     0,     0,     0,     0,     0,     0,     0,     0,     0,
     0,     0,     0,     0,     0,     0,     0,     0,     0,     0,
     0,     0,     0,     0,     0,     0,     0,     0,     0,     0,
     0,     0,     0,     0,     0,     0,     0,     0,     0,     0,
     0,     0,     0,     0,     0,     0,     0,     0,     0,     0,
     0,     0,     0,     0,     0,     0,     0,     0,     0,     0,
     0,     0,     0,     0,     0,     0,     0,     0,     0,     0,
     0,     0,     0,     0,     0,     0,     0,     0,     0,     0,
     0,     0,     0,     0,     0,    19,    14,     0,     0,     0,
    16,    28,    22,    26,     0,    12,    13,    17,     0,    15,
    27,    18,    31,     0,     0,    29,     0,    34,    28,     0,
    26,     0,     0,     0,     0,     0,     0,    27,     0,     0,
     0,     0,     0,     0,     0,     0,     0,     0,     0,    64,
    64 };
static CONST TclDatetabelem TclDatepact[]={

-10000000,   -43,-10000000,-10000000,-10000000,-10000000,-10000000,-10000000,-10000000,-10000000,
-10000000,-10000000,   -26,  -268,-10000000,  -259,  -226,-10000000,  -257,    10,
  -227,  -212,  -228,-10000000,-10000000,-10000000,-10000000,-10000000,-10000000,-10000000,
  -229,-10000000,  -230,  -240,  -231,-10000000,-10000000,  -264,-10000000,     9,
-10000000,-10000000,  -249,-10000000,-10000000,  -246,-10000000,     4,    -2,     2,
     7,     6,-10000000,-10000000,   -11,  -232,-10000000,-10000000,-10000000,-10000000,
  -233,-10000000,  -234,  -235,-10000000,  -237,  -238,  -239,  -242,-10000000,
-10000000,-10000000,    -1,-10000000,-10000000,-10000000,   -12,-10000000,  -243,  -263,
-10000000,-10000000 };
static CONST TclDatetabelem TclDatepgo[]={

     0,    48,    70,    22,    69,    68,    66,    65,    64,    63,
    62,    60,    59,    58,    57,    55 };
static CONST TclDatetabelem TclDater1[]={

     0,     4,     4,     5,     5,     5,     5,     5,     5,     5,
     5,     5,     6,     6,     6,     6,     6,     7,     7,     7,
    10,    10,    10,    10,    10,     8,     8,     8,     8,     8,
     8,     8,     8,     8,     8,     9,     9,    12,    12,    12,
    13,    11,    11,    15,    15,    15,    15,    15,     2,     2,
     1,     1,     1,    14,     3,     3 };
static CONST TclDatetabelem TclDater2[]={

     0,     0,     4,     3,     3,     3,     3,     3,     3,     3,
     3,     2,     5,     9,    11,    13,    15,     5,     3,     3,
     3,     5,     5,     7,     5,     7,    11,     3,    11,    11,
     5,     9,     5,     3,     7,     5,     7,     7,    15,     5,
     9,     5,     2,     7,     5,     5,     7,     3,     3,     3,
     3,     3,     3,     3,     1,     3 };
static CONST TclDatetabelem TclDatechk[]={

-10000000,    -4,    -5,    -6,    -7,    -8,    -9,   -10,   -11,   -12,
   -13,   -14,   268,   269,   259,   272,   263,   270,   274,   258,
    -2,   -15,   265,    45,    43,    -1,   266,   273,   264,   261,
    58,   258,    47,    45,   263,    -1,   271,   269,   272,   268,
   258,   263,   268,    -1,    44,   268,   257,   268,   268,   268,
   263,   268,   268,   272,   268,    44,   263,    -1,   258,    -1,
    46,    -3,    45,    58,   261,    47,    45,    45,    58,   268,
   268,   268,   268,   268,   268,   268,   268,    -3,    45,    58,
   268,   268 };
static CONST TclDatetabelem TclDatedef[]={

     1,    -2,     2,     3,     4,     5,     6,     7,     8,     9,
    10,    11,    53,    18,    19,    27,     0,    33,     0,    20,
     0,    42,     0,    48,    49,    47,    50,    51,    52,    12,
     0,    22,     0,     0,    32,    44,    17,     0,    39,    30,
    24,    35,     0,    45,    21,     0,    41,     0,    54,    25,
     0,     0,    34,    37,     0,     0,    36,    46,    23,    43,
     0,    13,     0,     0,    55,     0,     0,     0,     0,    31,
    40,    14,    54,    26,    28,    29,     0,    15,     0,     0,
    16,    38 };
typedef struct
#ifdef __cplusplus
      TclDatetoktype
#endif
{ char *t_name; int t_val; } TclDatetoktype;
#ifndef YYDEBUG
#     define YYDEBUG    0     /* don't allow debugging */
#endif

#if YYDEBUG

TclDatetoktype TclDatetoks[] =
{
      "tAGO",     257,
      "tDAY",     258,
      "tDAYZONE", 259,
      "tID",      260,
      "tMERIDIAN",      261,
      "tMINUTE_UNIT",   262,
      "tMONTH",   263,
      "tMONTH_UNIT",    264,
      "tSTARDATE",      265,
      "tSEC_UNIT",      266,
      "tSNUMBER", 267,
      "tUNUMBER", 268,
      "tZONE",    269,
      "tEPOCH",   270,
      "tDST",     271,
      "tISOBASE", 272,
      "tDAY_UNIT",      273,
      "tNEXT",    274,
      "-unknown-",      -1    /* ends search */
};

char * TclDatereds[] =
{
      "-no such reduction-",
      "spec : /* empty */",
      "spec : spec item",
      "item : time",
      "item : zone",
      "item : date",
      "item : ordMonth",
      "item : day",
      "item : relspec",
      "item : iso",
      "item : trek",
      "item : number",
      "time : tUNUMBER tMERIDIAN",
      "time : tUNUMBER ':' tUNUMBER o_merid",
      "time : tUNUMBER ':' tUNUMBER '-' tUNUMBER",
      "time : tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid",
      "time : tUNUMBER ':' tUNUMBER ':' tUNUMBER '-' tUNUMBER",
      "zone : tZONE tDST",
      "zone : tZONE",
      "zone : tDAYZONE",
      "day : tDAY",
      "day : tDAY ','",
      "day : tUNUMBER tDAY",
      "day : sign tUNUMBER tDAY",
      "day : tNEXT tDAY",
      "date : tUNUMBER '/' tUNUMBER",
      "date : tUNUMBER '/' tUNUMBER '/' tUNUMBER",
      "date : tISOBASE",
      "date : tUNUMBER '-' tMONTH '-' tUNUMBER",
      "date : tUNUMBER '-' tUNUMBER '-' tUNUMBER",
      "date : tMONTH tUNUMBER",
      "date : tMONTH tUNUMBER ',' tUNUMBER",
      "date : tUNUMBER tMONTH",
      "date : tEPOCH",
      "date : tUNUMBER tMONTH tUNUMBER",
      "ordMonth : tNEXT tMONTH",
      "ordMonth : tNEXT tUNUMBER tMONTH",
      "iso : tISOBASE tZONE tISOBASE",
      "iso : tISOBASE tZONE tUNUMBER ':' tUNUMBER ':' tUNUMBER",
      "iso : tISOBASE tISOBASE",
      "trek : tSTARDATE tUNUMBER '.' tUNUMBER",
      "relspec : relunits tAGO",
      "relspec : relunits",
      "relunits : sign tUNUMBER unit",
      "relunits : tUNUMBER unit",
      "relunits : tNEXT unit",
      "relunits : tNEXT tUNUMBER unit",
      "relunits : unit",
      "sign : '-'",
      "sign : '+'",
      "unit : tSEC_UNIT",
      "unit : tDAY_UNIT",
      "unit : tMONTH_UNIT",
      "number : tUNUMBER",
      "o_merid : /* empty */",
      "o_merid : tMERIDIAN",
};
#endif /* YYDEBUG */
/*
 * Copyright (c) 1993 by Sun Microsystems, Inc.
 */


/*
** Skeleton parser driver for yacc output
*/

/*
** yacc user known macros and defines
*/
#define YYERROR         goto TclDateerrlab
#define YYACCEPT  return(0)
#define YYABORT         return(1)
#define YYBACKUP( newtoken, newvalue )\
{\
      if ( TclDatechar >= 0 || ( TclDater2[ TclDatetmp ] >> 1 ) != 1 )\
      {\
            TclDateerror( "syntax error - cannot backup" );\
            goto TclDateerrlab;\
      }\
      TclDatechar = newtoken;\
      TclDatestate = *TclDateps;\
      TclDatelval = newvalue;\
      goto TclDatenewstate;\
}
#define YYRECOVERING()  (!!TclDateerrflag)
#define YYNEW(type)     malloc(sizeof(type) * TclDatenewmax)
#define YYCOPY(to, from, type) \
      (type *) memcpy(to, (char *) from, TclDatemaxdepth * sizeof (type))
#define YYENLARGE( from, type) \
      (type *) realloc((char *) from, TclDatenewmax * sizeof(type))
#ifndef YYDEBUG
#     define YYDEBUG    1     /* make debugging available */
#endif

/*
** user known globals
*/
int TclDatedebug;             /* set to 1 to get debugging */

/*
** driver internal defines
*/
#define YYFLAG          (-10000000)

/*
** global variables used by the parser
*/
YYSTYPE *TclDatepv;                 /* top of value stack */
int *TclDateps;               /* top of state stack */

int TclDatestate;             /* current state */
int TclDatetmp;               /* extra var (lasts between blocks) */

int TclDatenerrs;             /* number of errors */
int TclDateerrflag;                 /* error recovery flag */
int TclDatechar;              /* current input token number */



#ifdef YYNMBCHARS
#define YYLEX()         TclDatecvtok(TclDatelex())
/*
** TclDatecvtok - return a token if i is a wchar_t value that exceeds 255.
**    If i<255, i itself is the token.  If i>255 but the neither 
**    of the 30th or 31st bit is on, i is already a token.
*/
#if defined(__STDC__) || defined(__cplusplus)
int TclDatecvtok(int i)
#else
int TclDatecvtok(i) int i;
#endif
{
      int first = 0;
      int last = YYNMBCHARS - 1;
      int mid;
      wchar_t j;

      if(i&0x60000000){/*Must convert to a token. */
            if( TclDatembchars[last].character < i ){
                  return i;/*Giving up*/
            }
            while ((last>=first)&&(first>=0)) {/*Binary search loop*/
                  mid = (first+last)/2;
                  j = TclDatembchars[mid].character;
                  if( j==i ){/*Found*/ 
                        return TclDatembchars[mid].tvalue;
                  }else if( j<i ){
                        first = mid + 1;
                  }else{
                        last = mid -1;
                  }
            }
            /*No entry in the table.*/
            return i;/* Giving up.*/
      }else{/* i is already a token. */
            return i;
      }
}
#else/*!YYNMBCHARS*/
#define YYLEX()         TclDatelex()
#endif/*!YYNMBCHARS*/

/*
** TclDateparse - return 0 if worked, 1 if syntax error not recovered from
*/
#if defined(__STDC__) || defined(__cplusplus)
int TclDateparse(void)
#else
int TclDateparse()
#endif
{
      register YYSTYPE *TclDatepvt = 0;   /* top of value stack for $vars */

#if defined(__cplusplus) || defined(lint)
/*
      hacks to please C++ and lint - goto's inside
      switch should never be executed
*/
      static int __yaccpar_lint_hack__ = 0;
      switch (__yaccpar_lint_hack__)
      {
            case 1: goto TclDateerrlab;
            case 2: goto TclDatenewstate;
      }
#endif

      /*
      ** Initialize externals - TclDateparse may be called more than once
      */
      TclDatepv = &TclDatev[-1];
      TclDateps = &TclDates[-1];
      TclDatestate = 0;
      TclDatetmp = 0;
      TclDatenerrs = 0;
      TclDateerrflag = 0;
      TclDatechar = -1;

#if YYMAXDEPTH <= 0
      if (TclDatemaxdepth <= 0)
      {
            if ((TclDatemaxdepth = YYEXPAND(0)) <= 0)
            {
                  TclDateerror("yacc initialization error");
                  YYABORT;
            }
      }
#endif

      {
            register YYSTYPE *TclDate_pv; /* top of value stack */
            register int *TclDate_ps;           /* top of state stack */
            register int TclDate_state;         /* current state */
            register int  TclDate_n;            /* internal state number info */
      goto TclDatestack;      /* moved from 6 lines above to here to please C++ */

            /*
            ** get globals into registers.
            ** branch to here only if YYBACKUP was called.
            */
            TclDate_pv = TclDatepv;
            TclDate_ps = TclDateps;
            TclDate_state = TclDatestate;
            goto TclDate_newstate;

            /*
            ** get globals into registers.
            ** either we just started, or we just finished a reduction
            */
      TclDatestack:
            TclDate_pv = TclDatepv;
            TclDate_ps = TclDateps;
            TclDate_state = TclDatestate;

            /*
            ** top of for (;;) loop while no reductions done
            */
      TclDate_stack:
            /*
            ** put a state and value onto the stacks
            */
#if YYDEBUG
            /*
            ** if debugging, look up token value in list of value vs.
            ** name pairs.  0 and negative (-1) are special values.
            ** Note: linear search is used since time is not a real
            ** consideration while debugging.
            */
            if ( TclDatedebug )
            {
                  register int TclDate_i;

                  printf( "State %d, token ", TclDate_state );
                  if ( TclDatechar == 0 )
                        printf( "end-of-file\n" );
                  else if ( TclDatechar < 0 )
                        printf( "-none-\n" );
                  else
                  {
                        for ( TclDate_i = 0; TclDatetoks[TclDate_i].t_val >= 0;
                              TclDate_i++ )
                        {
                              if ( TclDatetoks[TclDate_i].t_val == TclDatechar )
                                    break;
                        }
                        printf( "%s\n", TclDatetoks[TclDate_i].t_name );
                  }
            }
#endif /* YYDEBUG */
            if ( ++TclDate_ps >= &TclDates[ TclDatemaxdepth ] )   /* room on stack? */
            {
                  /*
                  ** reallocate and recover.  Note that pointers
                  ** have to be reset, or bad things will happen
                  */
                  long TclDateps_index = (TclDate_ps - TclDates);
                  long TclDatepv_index = (TclDate_pv - TclDatev);
                  long TclDatepvt_index = (TclDatepvt - TclDatev);
                  int TclDatenewmax;
#ifdef YYEXPAND
                  TclDatenewmax = YYEXPAND(TclDatemaxdepth);
#else
                  TclDatenewmax = 2 * TclDatemaxdepth;      /* double table size */
                  if (TclDatemaxdepth == YYMAXDEPTH)  /* first time growth */
                  {
                        char *newTclDates = (char *)YYNEW(int);
                        char *newTclDatev = (char *)YYNEW(YYSTYPE);
                        if (newTclDates != 0 && newTclDatev != 0)
                        {
                              TclDates = YYCOPY(newTclDates, TclDates, int);
                              TclDatev = YYCOPY(newTclDatev, TclDatev, YYSTYPE);
                        }
                        else
                              TclDatenewmax = 0;      /* failed */
                  }
                  else                    /* not first time */
                  {
                        TclDates = YYENLARGE(TclDates, int);
                        TclDatev = YYENLARGE(TclDatev, YYSTYPE);
                        if (TclDates == 0 || TclDatev == 0)
                              TclDatenewmax = 0;      /* failed */
                  }
#endif
                  if (TclDatenewmax <= TclDatemaxdepth)     /* tables not expanded */
                  {
                        TclDateerror( "yacc stack overflow" );
                        YYABORT;
                  }
                  TclDatemaxdepth = TclDatenewmax;

                  TclDate_ps = TclDates + TclDateps_index;
                  TclDate_pv = TclDatev + TclDatepv_index;
                  TclDatepvt = TclDatev + TclDatepvt_index;
            }
            *TclDate_ps = TclDate_state;
            *++TclDate_pv = TclDateval;

            /*
            ** we have a new state - find out what to do
            */
      TclDate_newstate:
            if ( ( TclDate_n = TclDatepact[ TclDate_state ] ) <= YYFLAG )
                  goto TclDatedefault;          /* simple state */
#if YYDEBUG
            /*
            ** if debugging, need to mark whether new token grabbed
            */
            TclDatetmp = TclDatechar < 0;
#endif
            if ( ( TclDatechar < 0 ) && ( ( TclDatechar = YYLEX() ) < 0 ) )
                  TclDatechar = 0;        /* reached EOF */
#if YYDEBUG
            if ( TclDatedebug && TclDatetmp )
            {
                  register int TclDate_i;

                  printf( "Received token " );
                  if ( TclDatechar == 0 )
                        printf( "end-of-file\n" );
                  else if ( TclDatechar < 0 )
                        printf( "-none-\n" );
                  else
                  {
                        for ( TclDate_i = 0; TclDatetoks[TclDate_i].t_val >= 0;
                              TclDate_i++ )
                        {
                              if ( TclDatetoks[TclDate_i].t_val == TclDatechar )
                                    break;
                        }
                        printf( "%s\n", TclDatetoks[TclDate_i].t_name );
                  }
            }
#endif /* YYDEBUG */
            if ( ( ( TclDate_n += TclDatechar ) < 0 ) || ( TclDate_n >= YYLAST ) )
                  goto TclDatedefault;
            if ( TclDatechk[ TclDate_n = TclDateact[ TclDate_n ] ] == TclDatechar ) /*valid shift*/
            {
                  TclDatechar = -1;
                  TclDateval = TclDatelval;
                  TclDate_state = TclDate_n;
                  if ( TclDateerrflag > 0 )
                        TclDateerrflag--;
                  goto TclDate_stack;
            }

      TclDatedefault:
            if ( ( TclDate_n = TclDatedef[ TclDate_state ] ) == -2 )
            {
#if YYDEBUG
                  TclDatetmp = TclDatechar < 0;
#endif
                  if ( ( TclDatechar < 0 ) && ( ( TclDatechar = YYLEX() ) < 0 ) )
                        TclDatechar = 0;        /* reached EOF */
#if YYDEBUG
                  if ( TclDatedebug && TclDatetmp )
                  {
                        register int TclDate_i;

                        printf( "Received token " );
                        if ( TclDatechar == 0 )
                              printf( "end-of-file\n" );
                        else if ( TclDatechar < 0 )
                              printf( "-none-\n" );
                        else
                        {
                              for ( TclDate_i = 0;
                                    TclDatetoks[TclDate_i].t_val >= 0;
                                    TclDate_i++ )
                              {
                                    if ( TclDatetoks[TclDate_i].t_val
                                          == TclDatechar )
                                    {
                                          break;
                                    }
                              }
                              printf( "%s\n", TclDatetoks[TclDate_i].t_name );
                        }
                  }
#endif /* YYDEBUG */
                  /*
                  ** look through exception table
                  */
                  {
                        register CONST int *TclDatexi = TclDateexca;

                        while ( ( *TclDatexi != -1 ) ||
                              ( TclDatexi[1] != TclDate_state ) )
                        {
                              TclDatexi += 2;
                        }
                        while ( ( *(TclDatexi += 2) >= 0 ) &&
                              ( *TclDatexi != TclDatechar ) )
                              ;
                        if ( ( TclDate_n = TclDatexi[1] ) < 0 )
                              YYACCEPT;
                  }
            }

            /*
            ** check for syntax error
            */
            if ( TclDate_n == 0 )   /* have an error */
            {
                  /* no worry about speed here! */
                  switch ( TclDateerrflag )
                  {
                  case 0:           /* new error */
                        TclDateerror( "syntax error" );
                        goto skip_init;
                        /*
                        ** get globals into registers.
                        ** we have a user generated syntax type error
                        */
                        TclDate_pv = TclDatepv;
                        TclDate_ps = TclDateps;
                        TclDate_state = TclDatestate;
                  skip_init:
                        TclDatenerrs++;
                        /* FALLTHRU */
                  case 1:
                  case 2:           /* incompletely recovered error */
                              /* try again... */
                        TclDateerrflag = 3;
                        /*
                        ** find state where "error" is a legal
                        ** shift action
                        */
                        while ( TclDate_ps >= TclDates )
                        {
                              TclDate_n = TclDatepact[ *TclDate_ps ] + YYERRCODE;
                              if ( TclDate_n >= 0 && TclDate_n < YYLAST &&
                                    TclDatechk[TclDateact[TclDate_n]] == YYERRCODE)                         {
                                    /*
                                    ** simulate shift of "error"
                                    */
                                    TclDate_state = TclDateact[ TclDate_n ];
                                    goto TclDate_stack;
                              }
                              /*
                              ** current state has no shift on
                              ** "error", pop stack
                              */
#if YYDEBUG
#     define _POP_ "Error recovery pops state %d, uncovers state %d\n"
                              if ( TclDatedebug )
                                    printf( _POP_, *TclDate_ps,
                                          TclDate_ps[-1] );
#     undef _POP_
#endif
                              TclDate_ps--;
                              TclDate_pv--;
                        }
                        /*
                        ** there is no state on stack with "error" as
                        ** a valid shift.  give up.
                        */
                        YYABORT;
                  case 3:           /* no shift yet; eat a token */
#if YYDEBUG
                        /*
                        ** if debugging, look up token in list of
                        ** pairs.  0 and negative shouldn't occur,
                        ** but since timing doesn't matter when
                        ** debugging, it doesn't hurt to leave the
                        ** tests here.
                        */
                        if ( TclDatedebug )
                        {
                              register int TclDate_i;

                              printf( "Error recovery discards " );
                              if ( TclDatechar == 0 )
                                    printf( "token end-of-file\n" );
                              else if ( TclDatechar < 0 )
                                    printf( "token -none-\n" );
                              else
                              {
                                    for ( TclDate_i = 0;
                                          TclDatetoks[TclDate_i].t_val >= 0;
                                          TclDate_i++ )
                                    {
                                          if ( TclDatetoks[TclDate_i].t_val
                                                == TclDatechar )
                                          {
                                                break;
                                          }
                                    }
                                    printf( "token %s\n",
                                          TclDatetoks[TclDate_i].t_name );
                              }
                        }
#endif /* YYDEBUG */
                        if ( TclDatechar == 0 ) /* reached EOF. quit */
                              YYABORT;
                        TclDatechar = -1;
                        goto TclDate_newstate;
                  }
            }/* end if ( TclDate_n == 0 ) */
            /*
            ** reduction by production TclDate_n
            ** put stack tops, etc. so things right after switch
            */
#if YYDEBUG
            /*
            ** if debugging, print the string that is the user's
            ** specification of the reduction which is just about
            ** to be done.
            */
            if ( TclDatedebug )
                  printf( "Reduce by (%d) \"%s\"\n",
                        TclDate_n, TclDatereds[ TclDate_n ] );
#endif
            TclDatetmp = TclDate_n;             /* value to switch over */
            TclDatepvt = TclDate_pv;                  /* $vars top of value stack */
            /*
            ** Look in goto table for next state
            ** Sorry about using TclDate_state here as temporary
            ** register variable, but why not, if it works...
            ** If TclDater2[ TclDate_n ] doesn't have the low order bit
            ** set, then there is no action to be done for
            ** this reduction.  So, no saving & unsaving of
            ** registers done.  The only difference between the
            ** code just after the if and the body of the if is
            ** the goto TclDate_stack in the body.  This way the test
            ** can be made before the choice of what to do is needed.
            */
            {
                  /* length of production doubled with extra bit */
                  register int TclDate_len = TclDater2[ TclDate_n ];

                  if ( !( TclDate_len & 01 ) )
                  {
                        TclDate_len >>= 1;
                        TclDateval = ( TclDate_pv -= TclDate_len )[1];  /* $$ = $1 */
                        TclDate_state = TclDatepgo[ TclDate_n = TclDater1[ TclDate_n ] ] +
                              *( TclDate_ps -= TclDate_len ) + 1;
                        if ( TclDate_state >= YYLAST ||
                              TclDatechk[ TclDate_state =
                              TclDateact[ TclDate_state ] ] != -TclDate_n )
                        {
                              TclDate_state = TclDateact[ TclDatepgo[ TclDate_n ] ];
                        }
                        goto TclDate_stack;
                  }
                  TclDate_len >>= 1;
                  TclDateval = ( TclDate_pv -= TclDate_len )[1];  /* $$ = $1 */
                  TclDate_state = TclDatepgo[ TclDate_n = TclDater1[ TclDate_n ] ] +
                        *( TclDate_ps -= TclDate_len ) + 1;
                  if ( TclDate_state >= YYLAST ||
                        TclDatechk[ TclDate_state = TclDateact[ TclDate_state ] ] != -TclDate_n )
                  {
                        TclDate_state = TclDateact[ TclDatepgo[ TclDate_n ] ];
                  }
            }
                              /* save until reenter driver code */
            TclDatestate = TclDate_state;
            TclDateps = TclDate_ps;
            TclDatepv = TclDate_pv;
      }
      /*
      ** code supplied by user is placed in this switch
      */
      switch( TclDatetmp )
      {
            
case 3:{
            TclDateHaveTime++;
        } break;
case 4:{
            TclDateHaveZone++;
        } break;
case 5:{
            TclDateHaveDate++;
        } break;
case 6:{
            TclDateHaveOrdinalMonth++;
        } break;
case 7:{
            TclDateHaveDay++;
        } break;
case 8:{
            TclDateHaveRel++;
        } break;
case 9:{
          TclDateHaveTime++;
          TclDateHaveDate++;
      } break;
case 10:{
          TclDateHaveTime++;
          TclDateHaveDate++;
          TclDateHaveRel++;
        } break;
case 12:{
            TclDateHour = TclDatepvt[-1].Number;
            TclDateMinutes = 0;
            TclDateSeconds = 0;
            TclDateMeridian = TclDatepvt[-0].Meridian;
        } break;
case 13:{
            TclDateHour = TclDatepvt[-3].Number;
            TclDateMinutes = TclDatepvt[-1].Number;
            TclDateSeconds = 0;
            TclDateMeridian = TclDatepvt[-0].Meridian;
        } break;
case 14:{
            TclDateHour = TclDatepvt[-4].Number;
            TclDateMinutes = TclDatepvt[-2].Number;
            TclDateMeridian = MER24;
            TclDateDSTmode = DSToff;
            TclDateTimezone = (TclDatepvt[-0].Number % 100 + (TclDatepvt[-0].Number / 100) * 60);
        } break;
case 15:{
            TclDateHour = TclDatepvt[-5].Number;
            TclDateMinutes = TclDatepvt[-3].Number;
            TclDateSeconds = TclDatepvt[-1].Number;
            TclDateMeridian = TclDatepvt[-0].Meridian;
        } break;
case 16:{
            TclDateHour = TclDatepvt[-6].Number;
            TclDateMinutes = TclDatepvt[-4].Number;
            TclDateSeconds = TclDatepvt[-2].Number;
            TclDateMeridian = MER24;
            TclDateDSTmode = DSToff;
            TclDateTimezone = (TclDatepvt[-0].Number % 100 + (TclDatepvt[-0].Number / 100) * 60);
        } break;
case 17:{
            TclDateTimezone = TclDatepvt[-1].Number;
            TclDateDSTmode = DSTon;
        } break;
case 18:{
            TclDateTimezone = TclDatepvt[-0].Number;
            TclDateDSTmode = DSToff;
        } break;
case 19:{
            TclDateTimezone = TclDatepvt[-0].Number;
            TclDateDSTmode = DSTon;
        } break;
case 20:{
            TclDateDayOrdinal = 1;
            TclDateDayNumber = TclDatepvt[-0].Number;
        } break;
case 21:{
            TclDateDayOrdinal = 1;
            TclDateDayNumber = TclDatepvt[-1].Number;
        } break;
case 22:{
            TclDateDayOrdinal = TclDatepvt[-1].Number;
            TclDateDayNumber = TclDatepvt[-0].Number;
        } break;
case 23:{
            TclDateDayOrdinal = TclDatepvt[-2].Number * TclDatepvt[-1].Number;
            TclDateDayNumber = TclDatepvt[-0].Number;
        } break;
case 24:{
            TclDateDayOrdinal = 2;
            TclDateDayNumber = TclDatepvt[-0].Number;
        } break;
case 25:{
            TclDateMonth = TclDatepvt[-2].Number;
            TclDateDay = TclDatepvt[-0].Number;
        } break;
case 26:{
            TclDateMonth = TclDatepvt[-4].Number;
            TclDateDay = TclDatepvt[-2].Number;
            TclDateYear = TclDatepvt[-0].Number;
        } break;
case 27:{
          TclDateYear = TclDatepvt[-0].Number / 10000;
          TclDateMonth = (TclDatepvt[-0].Number % 10000)/100;
          TclDateDay = TclDatepvt[-0].Number % 100;
      } break;
case 28:{
          TclDateDay = TclDatepvt[-4].Number;
          TclDateMonth = TclDatepvt[-2].Number;
          TclDateYear = TclDatepvt[-0].Number;
      } break;
case 29:{
            TclDateMonth = TclDatepvt[-2].Number;
            TclDateDay = TclDatepvt[-0].Number;
            TclDateYear = TclDatepvt[-4].Number;
        } break;
case 30:{
            TclDateMonth = TclDatepvt[-1].Number;
            TclDateDay = TclDatepvt[-0].Number;
        } break;
case 31:{
            TclDateMonth = TclDatepvt[-3].Number;
            TclDateDay = TclDatepvt[-2].Number;
            TclDateYear = TclDatepvt[-0].Number;
        } break;
case 32:{
            TclDateMonth = TclDatepvt[-0].Number;
            TclDateDay = TclDatepvt[-1].Number;
        } break;
case 33:{
          TclDateMonth = 1;
          TclDateDay = 1;
          TclDateYear = EPOCH;
      } break;
case 34:{
            TclDateMonth = TclDatepvt[-1].Number;
            TclDateDay = TclDatepvt[-2].Number;
            TclDateYear = TclDatepvt[-0].Number;
        } break;
case 35:{
          TclDateMonthOrdinal = 1;
          TclDateMonth = TclDatepvt[-0].Number;
      } break;
case 36:{
          TclDateMonthOrdinal = TclDatepvt[-1].Number;
          TclDateMonth = TclDatepvt[-0].Number;
      } break;
case 37:{
            if (TclDatepvt[-1].Number != HOUR(- 7)) YYABORT;
          TclDateYear = TclDatepvt[-2].Number / 10000;
          TclDateMonth = (TclDatepvt[-2].Number % 10000)/100;
          TclDateDay = TclDatepvt[-2].Number % 100;
          TclDateHour = TclDatepvt[-0].Number / 10000;
          TclDateMinutes = (TclDatepvt[-0].Number % 10000)/100;
          TclDateSeconds = TclDatepvt[-0].Number % 100;
        } break;
case 38:{
            if (TclDatepvt[-5].Number != HOUR(- 7)) YYABORT;
          TclDateYear = TclDatepvt[-6].Number / 10000;
          TclDateMonth = (TclDatepvt[-6].Number % 10000)/100;
          TclDateDay = TclDatepvt[-6].Number % 100;
          TclDateHour = TclDatepvt[-4].Number;
          TclDateMinutes = TclDatepvt[-2].Number;
          TclDateSeconds = TclDatepvt[-0].Number;
        } break;
case 39:{
          TclDateYear = TclDatepvt[-1].Number / 10000;
          TclDateMonth = (TclDatepvt[-1].Number % 10000)/100;
          TclDateDay = TclDatepvt[-1].Number % 100;
          TclDateHour = TclDatepvt[-0].Number / 10000;
          TclDateMinutes = (TclDatepvt[-0].Number % 10000)/100;
          TclDateSeconds = TclDatepvt[-0].Number % 100;
        } break;
case 40:{
            /*
           * Offset computed year by -377 so that the returned years will
           * be in a range accessible with a 32 bit clock seconds value
           */
            TclDateYear = TclDatepvt[-2].Number/1000 + 2323 - 377;
            TclDateDay  = 1;
          TclDateMonth = 1;
          TclDateRelDay += ((TclDatepvt[-2].Number%1000)*(365 + IsLeapYear(TclDateYear)))/1000;
          TclDateRelSeconds += TclDatepvt[-0].Number * 144 * 60;
        } break;
case 41:{
          TclDateRelSeconds *= -1;
          TclDateRelMonth *= -1;
          TclDateRelDay *= -1;
      } break;
case 43:{ *TclDateRelPointer += TclDatepvt[-2].Number * TclDatepvt[-1].Number * TclDatepvt[-0].Number; } break;
case 44:{ *TclDateRelPointer += TclDatepvt[-1].Number * TclDatepvt[-0].Number; } break;
case 45:{ *TclDateRelPointer += TclDatepvt[-0].Number; } break;
case 46:{ *TclDateRelPointer += TclDatepvt[-1].Number * TclDatepvt[-0].Number; } break;
case 47:{ *TclDateRelPointer += TclDatepvt[-0].Number; } break;
case 48:{ TclDateval.Number = -1; } break;
case 49:{ TclDateval.Number =  1; } break;
case 50:{ TclDateval.Number = TclDatepvt[-0].Number; TclDateRelPointer = &TclDateRelSeconds; } break;
case 51:{ TclDateval.Number = TclDatepvt[-0].Number; TclDateRelPointer = &TclDateRelDay; } break;
case 52:{ TclDateval.Number = TclDatepvt[-0].Number; TclDateRelPointer = &TclDateRelMonth; } break;
case 53:{
      if (TclDateHaveTime && TclDateHaveDate && !TclDateHaveRel) {
          TclDateYear = TclDatepvt[-0].Number;
      } else {
          TclDateHaveTime++;
          if (TclDatepvt[-0].Number < 100) {
            TclDateHour = TclDatepvt[-0].Number;
            TclDateMinutes = 0;
          } else {
            TclDateHour = TclDatepvt[-0].Number / 100;
            TclDateMinutes = TclDatepvt[-0].Number % 100;
          }
          TclDateSeconds = 0;
          TclDateMeridian = MER24;
      }
    } break;
case 54:{
            TclDateval.Meridian = MER24;
        } break;
case 55:{
            TclDateval.Meridian = TclDatepvt[-0].Meridian;
        } break;
      }
      goto TclDatestack;            /* reset registers in driver code */
}


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