%{
/*
**  Originally written by Steven M. Bellovin <smb@research.att.com> while
**  at the University of North Carolina at Chapel Hill.  Later tweaked by
**  a couple of people on Usenet.  Completely overhauled by Rich $alz
**  <rsalz@bbn.com> and Jim Berets <jberets@bbn.com> in August, 1990;
**
**  This grammar has 10 shift/reduce conflicts.
**
**  This code is in the public domain and has no copyright.
**
**  Picked up from CVS and slightly cleaned up by to WARNS=5 level by
**  Poul-Henning Kamp <phk@FreeBSD.org>
**
*/

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <sys/types.h>
#include <sys/time.h>

#include "libfifolog.h"

#define yyparse getdate_yyparse
#define yylex getdate_yylex
#define yyerror getdate_yyerror

static int yyparse(void);
static int yylex(void);
static int yyerror(const char *);

#define EPOCH           1970
#define HOUR(x)         ((time_t)(x) * 60)
#define SECSPERDAY      (24L * 60L * 60L)


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


/*
**  Daylight-savings mode:  on, off, or not yet known.
*/
typedef enum _DSTMODE {
    DSToff, DSTon, 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     *yyInput;
static DSTMODE  yyDSTmode;
static time_t   yyDayOrdinal;
static time_t   yyDayNumber;
static int      yyHaveDate;
static int      yyHaveDay;
static int      yyHaveRel;
static int      yyHaveTime;
static int      yyHaveZone;
static time_t   yyTimezone;
static time_t   yyDay;
static time_t   yyHour;
static time_t   yyMinutes;
static time_t   yyMonth;
static time_t   yySeconds;
static time_t   yyYear;
static MERIDIAN yyMeridian;
static time_t   yyRelMonth;
static time_t   yyRelSeconds;

%}

%union {
    time_t              Number;
    enum _MERIDIAN      Meridian;
}

%token  tAGO tDAY tDAYZONE tID tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT
%token  tSEC_UNIT tSNUMBER tUNUMBER tZONE tDST

%type   <Number>        tDAY tDAYZONE tMINUTE_UNIT tMONTH tMONTH_UNIT
%type   <Number>        tSEC_UNIT tSNUMBER tUNUMBER tZONE
%type   <Meridian>      tMERIDIAN o_merid

%%

spec    : /* NULL */
        | spec item
        ;

item    : time {
            yyHaveTime++;
        }
        | zone {
            yyHaveZone++;
        }
        | date {
            yyHaveDate++;
        }
        | day {
            yyHaveDay++;
        }
        | rel {
            yyHaveRel++;
        }
        | cvsstamp {
            yyHaveTime++;
            yyHaveDate++;
            yyHaveZone++;
        }
        | number
        ;

cvsstamp: tUNUMBER '.' tUNUMBER '.' tUNUMBER '.' tUNUMBER '.' tUNUMBER '.' tUNUMBER {
            yyYear = $1;
            if (yyYear < 100) yyYear += 1900;
            yyMonth = $3;
            yyDay = $5;
            yyHour = $7;
            yyMinutes = $9;
            yySeconds = $11;
            yyDSTmode = DSToff;
            yyTimezone = 0;
        }
        ;

time    : tUNUMBER tMERIDIAN {
            yyHour = $1;
            yyMinutes = 0;
            yySeconds = 0;
            yyMeridian = $2;
        }
        | tUNUMBER ':' tUNUMBER o_merid {
            yyHour = $1;
            yyMinutes = $3;
            yySeconds = 0;
            yyMeridian = $4;
        }
        | tUNUMBER ':' tUNUMBER tSNUMBER {
            yyHour = $1;
            yyMinutes = $3;
            yyMeridian = MER24;
            yyDSTmode = DSToff;
            yyTimezone = - ($4 % 100 + ($4 / 100) * 60);
        }
        | tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid {
            yyHour = $1;
            yyMinutes = $3;
            yySeconds = $5;
            yyMeridian = $6;
        }
        | tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER {
            yyHour = $1;
            yyMinutes = $3;
            yySeconds = $5;
            yyMeridian = MER24;
            yyDSTmode = DSToff;
            yyTimezone = - ($6 % 100 + ($6 / 100) * 60);
        }
        ;

zone    : tZONE {
            yyTimezone = $1;
            yyDSTmode = DSToff;
        }
        | tDAYZONE {
            yyTimezone = $1;
            yyDSTmode = DSTon;
        }
        |
          tZONE tDST {
            yyTimezone = $1;
            yyDSTmode = DSTon;
        }
        ;

day     : tDAY {
            yyDayOrdinal = 1;
            yyDayNumber = $1;
        }
        | tDAY ',' {
            yyDayOrdinal = 1;
            yyDayNumber = $1;
        }
        | tUNUMBER tDAY {
            yyDayOrdinal = $1;
            yyDayNumber = $2;
        }
        ;

date    : tUNUMBER '/' tUNUMBER {
            yyMonth = $1;
            yyDay = $3;
        }
        | tUNUMBER '/' tUNUMBER '/' tUNUMBER {
            if ($1 >= 100) {
                yyYear = $1;
                yyMonth = $3;
                yyDay = $5;
            } else {
                yyMonth = $1;
                yyDay = $3;
                yyYear = $5;
            }
        }
        | tUNUMBER tSNUMBER tSNUMBER {
            /* ISO 8601 format.  yyyy-mm-dd.  */
            yyYear = $1;
            yyMonth = -$2;
            yyDay = -$3;
        }
        | tUNUMBER tMONTH tSNUMBER {
            /* e.g. 17-JUN-1992.  */
            yyDay = $1;
            yyMonth = $2;
            yyYear = -$3;
        }
        | tMONTH tUNUMBER {
            yyMonth = $1;
            yyDay = $2;
        }
        | tMONTH tUNUMBER ',' tUNUMBER {
            yyMonth = $1;
            yyDay = $2;
            yyYear = $4;
        }
        | tUNUMBER tMONTH {
            yyMonth = $2;
            yyDay = $1;
        }
        | tUNUMBER tMONTH tUNUMBER {
            yyMonth = $2;
            yyDay = $1;
            yyYear = $3;
        }
        ;

rel     : relunit tAGO {
            yyRelSeconds = -yyRelSeconds;
            yyRelMonth = -yyRelMonth;
        }
        | relunit
        ;

relunit : tUNUMBER tMINUTE_UNIT {
            yyRelSeconds += $1 * $2 * 60L;
        }
        | tSNUMBER tMINUTE_UNIT {
            yyRelSeconds += $1 * $2 * 60L;
        }
        | tMINUTE_UNIT {
            yyRelSeconds += $1 * 60L;
        }
        | tSNUMBER tSEC_UNIT {
            yyRelSeconds += $1;
        }
        | tUNUMBER tSEC_UNIT {
            yyRelSeconds += $1;
        }
        | tSEC_UNIT {
            yyRelSeconds++;
        }
        | tSNUMBER tMONTH_UNIT {
            yyRelMonth += $1 * $2;
        }
        | tUNUMBER tMONTH_UNIT {
            yyRelMonth += $1 * $2;
        }
        | tMONTH_UNIT {
            yyRelMonth += $1;
        }
        ;

number  : tUNUMBER {
            if (yyHaveTime && yyHaveDate && !yyHaveRel)
                yyYear = $1;
            else {
                if($1>10000) {
                    yyHaveDate++;
                    yyDay= ($1)%100;
                    yyMonth= ($1/100)%100;
                    yyYear = $1/10000;
                }
                else {
                    yyHaveTime++;
                    if ($1 < 100) {
                        yyHour = $1;
                        yyMinutes = 0;
                    }
                    else {
                        yyHour = $1 / 100;
                        yyMinutes = $1 % 100;
                    }
                    yySeconds = 0;
                    yyMeridian = MER24;
                }
            }
        }
        ;

o_merid : /* NULL */ {
            $$ = MER24;
        }
        | tMERIDIAN {
            $$ = $1;
        }
        ;

%%

/* Month and day table. */
static TABLE const 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,             0,    0 }
};

/* Time units table. */
static TABLE const UnitsTable[] = {
    { "year",           tMONTH_UNIT,    12 },
    { "month",          tMONTH_UNIT,    1 },
    { "fortnight",      tMINUTE_UNIT,   14 * 24 * 60 },
    { "week",           tMINUTE_UNIT,   7 * 24 * 60 },
    { "day",            tMINUTE_UNIT,   1 * 24 * 60 },
    { "hour",           tMINUTE_UNIT,   60 },
    { "minute",         tMINUTE_UNIT,   1 },
    { "min",            tMINUTE_UNIT,   1 },
    { "second",         tSEC_UNIT,      1 },
    { "sec",            tSEC_UNIT,      1 },
    { NULL,             0,              0 }
};

/* Assorted relative-time words. */
static TABLE const OtherTable[] = {
    { "tomorrow",       tMINUTE_UNIT,   1 * 24 * 60 },
    { "yesterday",      tMINUTE_UNIT,   -1 * 24 * 60 },
    { "today",          tMINUTE_UNIT,   0 },
    { "now",            tMINUTE_UNIT,   0 },
    { "last",           tUNUMBER,       -1 },
    { "this",           tMINUTE_UNIT,   0 },
    { "next",           tUNUMBER,       2 },
    { "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 },
    { "ago",            tAGO,           1 },
    { NULL,             0,              0 }
};

/* The timezone table. */
/* Some of these are commented out because a time_t can't store a float. */
static TABLE const TimezoneTable[] = {
    { "gmt",    tZONE,     HOUR( 0) },  /* Greenwich Mean */
    { "ut",     tZONE,     HOUR( 0) },  /* Universal (Coordinated) */
    { "utc",    tZONE,     HOUR( 0) },
    { "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
#if 0
    { "nft",    tZONE,     HOUR(3.5) }, /* Newfoundland */
    { "nst",    tZONE,     HOUR(3.5) }, /* Newfoundland Standard */
    { "ndt",    tDAYZONE,  HOUR(3.5) }, /* Newfoundland Daylight */
#endif
    { "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 */
    { "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 */
#if 0
    { "it",     tZONE,     -HOUR(3.5) },/* Iran */
#endif
    { "zp4",    tZONE,     -HOUR(4) },  /* USSR Zone 3 */
    { "zp5",    tZONE,     -HOUR(5) },  /* USSR Zone 4 */
#if 0
    { "ist",    tZONE,     -HOUR(5.5) },/* Indian Standard */
#endif
    { "zp6",    tZONE,     -HOUR(6) },  /* USSR Zone 5 */
#if     0
    /* For completeness.  NST is also Newfoundland Stanard, and SST is
     * also Swedish Summer. */
    { "nst",    tZONE,     -HOUR(6.5) },/* 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 */
#if 0
    { "jt",     tZONE,     -HOUR(7.5) },/* Java (3pm in Cronusland!) */
#endif
    { "cct",    tZONE,     -HOUR(8) },  /* China Coast, USSR Zone 7 */
    { "jst",    tZONE,     -HOUR(9) },  /* Japan Standard, USSR Zone 8 */
#if 0
    { "cast",   tZONE,     -HOUR(9.5) },/* Central Australian Standard */
    { "cadt",   tDAYZONE,  -HOUR(9.5) },/* Central Australian Daylight */
#endif
    { "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 */
    {  NULL,    0,         0 }
};

/* Military timezone table. */
static TABLE const 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,     0,  0 }
};




/* ARGSUSED */
static int
yyerror(const char *s __unused)
{
  return 0;
}


static time_t
ToSeconds(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;
        if (Hours == 12)
            Hours = 0;
        return (Hours * 60L + Minutes) * 60L + Seconds;
    case MERpm:
        if (Hours < 1 || Hours > 12)
            return -1;
        if (Hours == 12)
            Hours = 0;
        return ((Hours + 12) * 60L + Minutes) * 60L + Seconds;
    default:
        abort ();
    }
    /* NOTREACHED */
}


/* Year is either
   * A negative number, which means to use its absolute value (why?)
   * A number from 0 to 99, which means a year from 1900 to 1999, or
   * The actual year (>=100).  */
static time_t
Convert(time_t Month, time_t Day, time_t Year,
    time_t Hours, time_t Minutes, time_t Seconds,
    MERIDIAN Meridian, DSTMODE DSTmode)
{
    static int DaysInMonth[12] = {
        31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
    };
    time_t      tod;
    time_t      Julian;
    int         i;
    struct tm   *ltm;

    if (Year < 0)
        Year = -Year;
    if (Year < 69)
        Year += 2000;
    else if (Year < 100)
        Year += 1900;
    DaysInMonth[1] = Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0)
                    ? 29 : 28;
    /* Checking for 2038 bogusly assumes that time_t is 32 bits.  But
       I'm too lazy to try to check for time_t overflow in another way.  */
    if (Year < EPOCH || Year > 2038
     || Month < 1 || Month > 12
     /* Lint fluff:  "conversion from long may lose accuracy" */
     || Day < 1 || Day > DaysInMonth[(int)--Month])
        /* FIXME:
         * It would be nice to set a global error string here.
         * "February 30 is not a valid date" is much more informative than
         * "Can't parse date/time: 100 months" when the user input was
         * "100 months" and addition resolved that to February 30, for
         * example.  See rcs2-7 in src/sanity.sh for more. */
        return -1;

    for (Julian = Day - 1, i = 0; i < Month; i++)
        Julian += DaysInMonth[i];
    for (i = EPOCH; i < Year; i++)
        Julian += 365 + (i % 4 == 0);
    Julian *= SECSPERDAY;
    Julian += yyTimezone * 60L;
    if ((tod = ToSeconds(Hours, Minutes, Seconds, Meridian)) < 0)
        return -1;
    Julian += tod;
    ltm = localtime(&Julian);
fprintf(stderr, "DST %d TZ %s %d\n", DSTmode, ltm->tm_zone, ltm->tm_isdst);
    if (DSTmode == DSTon
     || (DSTmode == DSTmaybe && localtime(&Julian)->tm_isdst))
        Julian -= 60 * 60;
    return Julian;
}


static time_t
DSTcorrect(time_t Start, time_t Future)
{
    time_t      StartDay;
    time_t      FutureDay;

    StartDay = (localtime(&Start)->tm_hour + 1) % 24;
    FutureDay = (localtime(&Future)->tm_hour + 1) % 24;
    return (Future - Start) + (StartDay - FutureDay) * 60L * 60L;
}


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

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


static time_t
RelativeMonth(time_t Start, time_t RelMonth)
{
    struct tm   *tm;
    time_t      Month;
    time_t      Year;

    if (RelMonth == 0)
        return 0;
    tm = localtime(&Start);
    Month = 12 * (tm->tm_year + 1900) + tm->tm_mon + RelMonth;
    Year = Month / 12;
    Month = Month % 12 + 1;
    return DSTcorrect(Start,
            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));
}


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

    /* Make it lowercase. */
    for (p = buff; *p; p++)
        if (isupper(*p))
            *p = tolower(*p);

    if (strcmp(buff, "am") == 0 || strcmp(buff, "a.m.") == 0) {
        yylval.Meridian = MERam;
        return tMERIDIAN;
    }
    if (strcmp(buff, "pm") == 0 || strcmp(buff, "p.m.") == 0) {
        yylval.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) {
                yylval.Number = tp->value;
                return tp->type;
            }
        }
        else if (strcmp(buff, tp->name) == 0) {
            yylval.Number = tp->value;
            return tp->type;
        }
    }

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

    if (strcmp(buff, "dst") == 0) 
        return tDST;

    for (tp = UnitsTable; tp->name; tp++)
        if (strcmp(buff, tp->name) == 0) {
            yylval.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) {
                yylval.Number = tp->value;
                return tp->type;
            }
        buff[i] = 's';          /* Put back for "this" in OtherTable. */
    }

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

    /* Military timezones. */
    if (buff[1] == '\0' && isalpha(*buff)) {
        for (tp = MilitaryTable; tp->name; tp++)
            if (strcmp(buff, tp->name) == 0) {
                yylval.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) {
                yylval.Number = tp->value;
                return tp->type;
            }

    return tID;
}


static int
yylex(void)
{
    char        c;
    char        *p;
    char                buff[20];
    int                 Count;
    int                 sign;

    for ( ; ; ) {
        while (isspace(*yyInput))
            yyInput++;

        if (isdigit(c = *yyInput) || c == '-' || c == '+') {
            if (c == '-' || c == '+') {
                sign = c == '-' ? -1 : 1;
                if (!isdigit(*++yyInput))
                    /* skip the '-' sign */
                    continue;
            }
            else
                sign = 0;
            for (yylval.Number = 0; isdigit(c = *yyInput++); )
                yylval.Number = 10 * yylval.Number + c - '0';
            yyInput--;
            if (sign < 0)
                yylval.Number = -yylval.Number;
            return sign ? tSNUMBER : tUNUMBER;
        }
        if (isalpha(c)) {
            for (p = buff; isalpha(c = *yyInput++) || c == '.'; )
                if (p < &buff[sizeof buff - 1])
                    *p++ = c;
            *p = '\0';
            yyInput--;
            return LookupWord(buff);
        }
        if (c != '(')
            return *yyInput++;
        Count = 0;
        do {
            c = *yyInput++;
            if (c == '\0')
                return c;
            if (c == '(')
                Count++;
            else if (c == ')')
                Count--;
        } while (Count > 0);
    }
}

#define TM_YEAR_ORIGIN 1900

time_t
get_date(char *p)
{
    struct tm           *tm;
    time_t              Start;
    time_t              tod;
    time_t nowtime;

    yyInput = p;

    (void)time (&nowtime);

    if (! (tm = localtime (&nowtime)))
        return -1;

    yyYear = tm->tm_year + 1900;
    yyMonth = tm->tm_mon + 1;
    yyDay = tm->tm_mday;
    yyTimezone = tm->tm_gmtoff;
    yyDSTmode = DSTmaybe;
    yyHour = 0;
    yyMinutes = 0;
    yySeconds = 0;
    yyMeridian = MER24;
    yyRelSeconds = 0;
    yyRelMonth = 0;
    yyHaveDate = 0;
    yyHaveDay = 0;
    yyHaveRel = 0;
    yyHaveTime = 0;
    yyHaveZone = 0;

    if (yyparse()
     || yyHaveTime > 1 || yyHaveZone > 1 || yyHaveDate > 1 || yyHaveDay > 1)
        return -1;

    if (yyHaveDate || yyHaveTime || yyHaveDay) {
        Start = Convert(yyMonth, yyDay, yyYear, yyHour, yyMinutes, yySeconds,
                    yyMeridian, yyDSTmode);
        if (Start < 0)
            return -1;
    }
    else {
        Start = nowtime;
        if (!yyHaveRel)
            Start -= ((tm->tm_hour * 60L + tm->tm_min) * 60L) + tm->tm_sec;
    }

    Start += yyRelSeconds;
    Start += RelativeMonth(Start, yyRelMonth);

    if (yyHaveDay && !yyHaveDate) {
        tod = RelativeDate(Start, yyDayOrdinal, yyDayNumber);
        Start += tod;
    }

    /* Have to do *something* with a legitimate -1 so it's distinguishable
     * from the error return value.  (Alternately could set errno on error.) */
    return Start == -1 ? 0 : Start;
}