[citadel.git] / rss2ctdl / parsedate.c

/* A Bison parser, made by GNU Bison 1.875.  */

/* Skeleton parser for Yacc-like parsing with Bison,
   Copyright (C) 1984, 1989, 1990, 2000, 2001, 2002 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

/* As a special exception, when this file is copied by Bison into a
   Bison output file, you may use that output file without restriction.
   This special exception was added by the Free Software Foundation
   in version 1.24 of Bison.  */

/* Written by Richard Stallman by simplifying the original so called
   ``semantic'' parser.  */

/* All symbols defined below should begin with yy or YY, to avoid
   infringing on user name space.  This should be done even for local
   variables, as they might otherwise be expanded by user macros.
   There are some unavoidable exceptions within include files to
   define necessary library symbols; they are noted "INFRINGES ON
   USER NAME SPACE" below.  */

/* Identify Bison output.  */
#define YYBISON 1

/* Skeleton name.  */
#define YYSKELETON_NAME "yacc.c"

/* Pure parsers.  */
#define YYPURE 0

/* Using locations.  */
#define YYLSP_NEEDED 0



/* Tokens.  */
#ifndef YYTOKENTYPE
# define YYTOKENTYPE
   /* Put the tokens into the symbol table, so that GDB and other debuggers
      know about them.  */
   enum yytokentype {
     tDAY = 258,
     tDAYZONE = 259,
     tMERIDIAN = 260,
     tMONTH = 261,
     tMONTH_UNIT = 262,
     tSEC_UNIT = 263,
     tSNUMBER = 264,
     tUNUMBER = 265,
     tZONE = 266
   };
#endif
#define tDAY 258
#define tDAYZONE 259
#define tMERIDIAN 260
#define tMONTH 261
#define tMONTH_UNIT 262
#define tSEC_UNIT 263
#define tSNUMBER 264
#define tUNUMBER 265
#define tZONE 266




/* Copy the first part of user declarations.  */

/* $Revision$
**
**  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@osf.org> and Jim Berets <jberets@bbn.com> in August, 1990.
**  Further revised (removed obsolete constructs and cleaned up timezone
**  names) in August, 1991, by Rich.  Paul Eggert <eggert@twinsun.com>
**  helped in September, 1992.  Art Cancro <ajc@uncensored.citadel.org> cleaned
**  it up for ANSI C in December, 1999.
**
**  This grammar has six shift/reduce conflicts.
**
**  This code is in the public domain and has no copyright.
*/
/* SUPPRESS 530 *//* Empty body for statement */
/* SUPPRESS 593 on yyerrlab *//* Label was not used */
/* SUPPRESS 593 on yynewstate *//* Label was not used */
/* SUPPRESS 595 on yypvt *//* Automatic variable may be used before set */



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

#include "parsedate.h"

int date_lex(void);

#define yyparse         date_parse
#define yylex           date_lex
#define yyerror         date_error


    /* See the LeapYears table in Convert. */
#define EPOCH           1970
#define END_OF_TIME     2038
    /* Constants for general time calculations. */
#define DST_OFFSET      1
#define SECSPERDAY      (24L * 60L * 60L)
    /* Readability for TABLE stuff. */
#define HOUR(x)         (x * 60)

#define LPAREN          '('
#define RPAREN          ')'
#define IS7BIT(x)       ((unsigned int)(x) < 0200)

#define SIZEOF(array)   ((int)(sizeof array / sizeof array[0]))
#define ENDOF(array)    (&array[SIZEOF(array)])


/*
**  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 them by using a yacc
**  union, but this is more efficient.  (This routine predates the
**  yacc %union construct.)
*/
static char     *yyInput;
static DSTMODE  yyDSTmode;
static int      yyHaveDate;
static int      yyHaveRel;
static int      yyHaveTime;
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;


static void             date_error(char *);


/* Enabling traces.  */
#ifndef YYDEBUG
# define YYDEBUG 0
#endif

/* Enabling verbose error messages.  */
#ifdef YYERROR_VERBOSE
# undef YYERROR_VERBOSE
# define YYERROR_VERBOSE 1
#else
# define YYERROR_VERBOSE 0
#endif

#if ! defined (YYSTYPE) && ! defined (YYSTYPE_IS_DECLARED)
typedef union YYSTYPE {
    time_t              Number;
    enum _MERIDIAN      Meridian;
} YYSTYPE;
/* Line 191 of yacc.c.  */
#line 230 "y.tab.c"
# define yystype YYSTYPE /* obsolescent; will be withdrawn */
# define YYSTYPE_IS_DECLARED 1
# define YYSTYPE_IS_TRIVIAL 1
#endif



/* Copy the second part of user declarations.  */


/* Line 214 of yacc.c.  */
#line 242 "y.tab.c"

#if ! defined (yyoverflow) || YYERROR_VERBOSE

/* The parser invokes alloca or malloc; define the necessary symbols.  */

# if YYSTACK_USE_ALLOCA
#  define YYSTACK_ALLOC alloca
# else
#  ifndef YYSTACK_USE_ALLOCA
#   if defined (alloca) || defined (_ALLOCA_H)
#    define YYSTACK_ALLOC alloca
#   else
#    ifdef __GNUC__
#     define YYSTACK_ALLOC __builtin_alloca
#    endif
#   endif
#  endif
# endif

# ifdef YYSTACK_ALLOC
   /* Pacify GCC's `empty if-body' warning. */
#  define YYSTACK_FREE(Ptr) do { /* empty */; } while (0)
# else
#  if defined (__STDC__) || defined (__cplusplus)
#   include <stdlib.h> /* INFRINGES ON USER NAME SPACE */
#   define YYSIZE_T size_t
#  endif
#  define YYSTACK_ALLOC malloc
#  define YYSTACK_FREE free
# endif
#endif /* ! defined (yyoverflow) || YYERROR_VERBOSE */


#if (! defined (yyoverflow) \
     && (! defined (__cplusplus) \
         || (YYSTYPE_IS_TRIVIAL)))

/* A type that is properly aligned for any stack member.  */
union yyalloc
{
  short yyss;
  YYSTYPE yyvs;
  };

/* The size of the maximum gap between one aligned stack and the next.  */
# define YYSTACK_GAP_MAXIMUM (sizeof (union yyalloc) - 1)

/* The size of an array large to enough to hold all stacks, each with
   N elements.  */
# define YYSTACK_BYTES(N) \
     ((N) * (sizeof (short) + sizeof (YYSTYPE))                         \
      + YYSTACK_GAP_MAXIMUM)

/* Copy COUNT objects from FROM to TO.  The source and destination do
   not overlap.  */
# ifndef YYCOPY
#  if 1 < __GNUC__
#   define YYCOPY(To, From, Count) \
      __builtin_memcpy (To, From, (Count) * sizeof (*(From)))
#  else
#   define YYCOPY(To, From, Count)              \
      do                                        \
        {                                       \
          register YYSIZE_T yyi;                \
          for (yyi = 0; yyi < (Count); yyi++)   \
            (To)[yyi] = (From)[yyi];            \
        }                                       \
      while (0)
#  endif
# endif

/* Relocate STACK from its old location to the new one.  The
   local variables YYSIZE and YYSTACKSIZE give the old and new number of
   elements in the stack, and YYPTR gives the new location of the
   stack.  Advance YYPTR to a properly aligned location for the next
   stack.  */
# define YYSTACK_RELOCATE(Stack)                                        \
    do                                                                  \
      {                                                                 \
        YYSIZE_T yynewbytes;                                            \
        YYCOPY (&yyptr->Stack, Stack, yysize);                          \
        Stack = &yyptr->Stack;                                          \
        yynewbytes = yystacksize * sizeof (*Stack) + YYSTACK_GAP_MAXIMUM; \
        yyptr += yynewbytes / sizeof (*yyptr);                          \
      }                                                                 \
    while (0)

#endif

#if defined (__STDC__) || defined (__cplusplus)
   typedef signed char yysigned_char;
#else
   typedef short yysigned_char;
#endif

/* YYFINAL -- State number of the termination state. */
#define YYFINAL  2
/* YYLAST -- Last index in YYTABLE.  */
#define YYLAST   40

/* YYNTOKENS -- Number of terminals. */
#define YYNTOKENS  15
/* YYNNTS -- Number of nonterminals. */
#define YYNNTS  9
/* YYNRULES -- Number of rules. */
#define YYNRULES  30
/* YYNRULES -- Number of states. */
#define YYNSTATES  44

/* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX.  */
#define YYUNDEFTOK  2
#define YYMAXUTOK   266

#define YYTRANSLATE(YYX)                                                \
  ((unsigned int) (YYX) <= YYMAXUTOK ? yytranslate[YYX] : YYUNDEFTOK)

/* YYTRANSLATE[YYLEX] -- Bison symbol number corresponding to YYLEX.  */
static const unsigned char yytranslate[] =
{
       0,     2,     2,     2,     2,     2,     2,     2,     2,     2,
       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
       2,     2,     2,     2,    14,     2,     2,    13,     2,     2,
       2,     2,     2,     2,     2,     2,     2,     2,    12,     2,
       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
       2,     2,     2,     2,     2,     2,     1,     2,     3,     4,
       5,     6,     7,     8,     9,    10,    11
};

#if YYDEBUG
/* YYPRHS[YYN] -- Index of the first RHS symbol of rule number YYN in
   YYRHS.  */
static const unsigned char yyprhs[] =
{
       0,     0,     3,     4,     7,     9,    12,    14,    16,    19,
      24,    29,    36,    43,    45,    47,    50,    52,    54,    58,
      64,    67,    72,    75,    79,    85,    88,    91,    94,    97,
      98
};

/* YYRHS -- A `-1'-separated list of the rules' RHS. */
static const yysigned_char yyrhs[] =
{
      16,     0,    -1,    -1,    16,    17,    -1,    18,    -1,    18,
      19,    -1,    21,    -1,    22,    -1,    10,    23,    -1,    10,
      12,    10,    23,    -1,    10,    12,    10,    20,    -1,    10,
      12,    10,    12,    10,    23,    -1,    10,    12,    10,    12,
      10,    20,    -1,    11,    -1,     4,    -1,    11,    20,    -1,
      20,    -1,     9,    -1,    10,    13,    10,    -1,    10,    13,
      10,    13,    10,    -1,     6,    10,    -1,     6,    10,    14,
      10,    -1,    10,     6,    -1,    10,     6,    10,    -1,     3,
      14,    10,     6,    10,    -1,     9,     8,    -1,    10,     8,
      -1,     9,     7,    -1,    10,     7,    -1,    -1,     5,    -1
};

/* YYRLINE[YYN] -- source line where rule number YYN was defined.  */
static const unsigned short yyrline[] =
{
       0,   143,   143,   144,   147,   156,   160,   163,   168,   180,
     186,   193,   199,   209,   213,   217,   225,   231,   252,   256,
     268,   272,   277,   281,   286,   293,   296,   299,   302,   307,
     310
};
#endif

#if YYDEBUG || YYERROR_VERBOSE
/* YYTNME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
   First, the terminals, then, starting at YYNTOKENS, nonterminals. */
static const char *const yytname[] =
{
  "$end", "error", "$undefined", "tDAY", "tDAYZONE", "tMERIDIAN", "tMONTH", 
  "tMONTH_UNIT", "tSEC_UNIT", "tSNUMBER", "tUNUMBER", "tZONE", "':'", 
  "'/'", "','", "$accept", "spec", "item", "time", "zone", "numzone", 
  "date", "rel", "o_merid", 0
};
#endif

# ifdef YYPRINT
/* YYTOKNUM[YYLEX-NUM] -- Internal token number corresponding to
   token YYLEX-NUM.  */
static const unsigned short yytoknum[] =
{
       0,   256,   257,   258,   259,   260,   261,   262,   263,   264,
     265,   266,    58,    47,    44
};
# endif

/* YYR1[YYN] -- Symbol number of symbol that rule YYN derives.  */
static const unsigned char yyr1[] =
{
       0,    15,    16,    16,    17,    17,    17,    17,    18,    18,
      18,    18,    18,    19,    19,    19,    19,    20,    21,    21,
      21,    21,    21,    21,    21,    22,    22,    22,    22,    23,
      23
};

/* YYR2[YYN] -- Number of symbols composing right hand side of rule YYN.  */
static const unsigned char yyr2[] =
{
       0,     2,     0,     2,     1,     2,     1,     1,     2,     4,
       4,     6,     6,     1,     1,     2,     1,     1,     3,     5,
       2,     4,     2,     3,     5,     2,     2,     2,     2,     0,
       1
};

/* YYDEFACT[STATE-NAME] -- Default rule to reduce with in state
   STATE-NUM when YYTABLE doesn't specify something else to do.  Zero
   means the default is an error.  */
static const unsigned char yydefact[] =
{
       2,     0,     1,     0,     0,     0,    29,     3,     4,     6,
       7,     0,    20,    27,    25,    30,    22,    28,    26,     0,
       0,     8,    14,    17,    13,     5,    16,     0,     0,    23,
      29,    18,    15,     0,    21,     0,    10,     9,     0,    24,
      29,    19,    12,    11
};

/* YYDEFGOTO[NTERM-NUM]. */
static const yysigned_char yydefgoto[] =
{
      -1,     1,     7,     8,    25,    26,     9,    10,    21
};

/* YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing
   STATE-NUM.  */
#define YYPACT_NINF -29
static const yysigned_char yypact[] =
{
     -29,     1,   -29,   -11,    11,    20,    12,   -29,     4,   -29,
     -29,    13,    16,   -29,   -29,   -29,    21,   -29,   -29,    22,
      23,   -29,   -29,   -29,     5,   -29,   -29,    28,    25,   -29,
      17,    24,   -29,    26,   -29,    29,   -29,   -29,    30,   -29,
       0,   -29,   -29,   -29
};

/* YYPGOTO[NTERM-NUM].  */
static const yysigned_char yypgoto[] =
{
     -29,   -29,   -29,   -29,   -29,   -24,   -29,   -29,   -28
};

/* YYTABLE[YYPACT[STATE-NUM]].  What to do in state STATE-NUM.  If
   positive, shift that token.  If negative, reduce the rule which
   number is the opposite.  If zero, do what YYDEFACT says.
   If YYTABLE_NINF, syntax error.  */
#define YYTABLE_NINF -1
static const unsigned char yytable[] =
{
      32,     2,    37,    11,     3,    15,    36,     4,    22,    23,
       5,     6,    43,    23,    23,    24,    42,    15,    16,    17,
      18,    12,    15,    27,    19,    20,    23,    13,    14,    35,
      28,    29,    30,    31,    33,    34,    39,    38,     0,    40,
      41
};

static const yysigned_char yycheck[] =
{
      24,     0,    30,    14,     3,     5,    30,     6,     4,     9,
       9,    10,    40,     9,     9,    11,    40,     5,     6,     7,
       8,    10,     5,    10,    12,    13,     9,     7,     8,    12,
      14,    10,    10,    10,     6,    10,    10,    13,    -1,    10,
      10
};

/* YYSTOS[STATE-NUM] -- The (internal number of the) accessing
   symbol of state STATE-NUM.  */
static const unsigned char yystos[] =
{
       0,    16,     0,     3,     6,     9,    10,    17,    18,    21,
      22,    14,    10,     7,     8,     5,     6,     7,     8,    12,
      13,    23,     4,     9,    11,    19,    20,    10,    14,    10,
      10,    10,    20,     6,    10,    12,    20,    23,    13,    10,
      10,    10,    20,    23
};

#if ! defined (YYSIZE_T) && defined (__SIZE_TYPE__)
# define YYSIZE_T __SIZE_TYPE__
#endif
#if ! defined (YYSIZE_T) && defined (size_t)
# define YYSIZE_T size_t
#endif
#if ! defined (YYSIZE_T)
# if defined (__STDC__) || defined (__cplusplus)
#  include <stddef.h> /* INFRINGES ON USER NAME SPACE */
#  define YYSIZE_T size_t
# endif
#endif
#if ! defined (YYSIZE_T)
# define YYSIZE_T unsigned int
#endif

#define yyerrok         (yyerrstatus = 0)
#define yyclearin       (yychar = YYEMPTY)
#define YYEMPTY         (-2)
#define YYEOF           0

#define YYACCEPT        goto yyacceptlab
#define YYABORT         goto yyabortlab
#define YYERROR         goto yyerrlab1


/* Like YYERROR except do call yyerror.  This remains here temporarily
   to ease the transition to the new meaning of YYERROR, for GCC.
   Once GCC version 2 has supplanted version 1, this can go.  */

#define YYFAIL          goto yyerrlab

#define YYRECOVERING()  (!!yyerrstatus)

#define YYBACKUP(Token, Value)                                  \
do                                                              \
  if (yychar == YYEMPTY && yylen == 1)                          \
    {                                                           \
      yychar = (Token);                                         \
      yylval = (Value);                                         \
      yytoken = YYTRANSLATE (yychar);                           \
      YYPOPSTACK;                                               \
      goto yybackup;                                            \
    }                                                           \
  else                                                          \
    {                                                           \
      yyerror ("syntax error: cannot back up");\
      YYERROR;                                                  \
    }                                                           \
while (0)

#define YYTERROR        1
#define YYERRCODE       256

/* YYLLOC_DEFAULT -- Compute the default location (before the actions
   are run).  */

#ifndef YYLLOC_DEFAULT
# define YYLLOC_DEFAULT(Current, Rhs, N)         \
  Current.first_line   = Rhs[1].first_line;      \
  Current.first_column = Rhs[1].first_column;    \
  Current.last_line    = Rhs[N].last_line;       \
  Current.last_column  = Rhs[N].last_column;
#endif

/* YYLEX -- calling `yylex' with the right arguments.  */

#ifdef YYLEX_PARAM
# define YYLEX yylex (YYLEX_PARAM)
#else
# define YYLEX yylex ()
#endif

/* Enable debugging if requested.  */
#if YYDEBUG

# ifndef YYFPRINTF
#  include <stdio.h> /* INFRINGES ON USER NAME SPACE */
#  define YYFPRINTF fprintf
# endif

# define YYDPRINTF(Args)                        \
do {                                            \
  if (yydebug)                                  \
    YYFPRINTF Args;                             \
} while (0)

# define YYDSYMPRINT(Args)                      \
do {                                            \
  if (yydebug)                                  \
    yysymprint Args;                            \
} while (0)

# define YYDSYMPRINTF(Title, Token, Value, Location)            \
do {                                                            \
  if (yydebug)                                                  \
    {                                                           \
      YYFPRINTF (stderr, "%s ", Title);                         \
      yysymprint (stderr,                                       \
                  Token, Value);        \
      YYFPRINTF (stderr, "\n");                                 \
    }                                                           \
} while (0)

/*------------------------------------------------------------------.
| yy_stack_print -- Print the state stack from its BOTTOM up to its |
| TOP (cinluded).                                                   |
`------------------------------------------------------------------*/

#if defined (__STDC__) || defined (__cplusplus)
static void
yy_stack_print (short *bottom, short *top)
#else
static void
yy_stack_print (bottom, top)
    short *bottom;
    short *top;
#endif
{
  YYFPRINTF (stderr, "Stack now");
  for (/* Nothing. */; bottom <= top; ++bottom)
    YYFPRINTF (stderr, " %d", *bottom);
  YYFPRINTF (stderr, "\n");
}

# define YY_STACK_PRINT(Bottom, Top)                            \
do {                                                            \
  if (yydebug)                                                  \
    yy_stack_print ((Bottom), (Top));                           \
} while (0)


/*------------------------------------------------.
| Report that the YYRULE is going to be reduced.  |
`------------------------------------------------*/

#if defined (__STDC__) || defined (__cplusplus)
static void
yy_reduce_print (int yyrule)
#else
static void
yy_reduce_print (yyrule)
    int yyrule;
#endif
{
  int yyi;
  unsigned int yylineno = yyrline[yyrule];
  YYFPRINTF (stderr, "Reducing stack by rule %d (line %u), ",
             yyrule - 1, yylineno);
  /* Print the symbols being reduced, and their result.  */
  for (yyi = yyprhs[yyrule]; 0 <= yyrhs[yyi]; yyi++)
    YYFPRINTF (stderr, "%s ", yytname [yyrhs[yyi]]);
  YYFPRINTF (stderr, "-> %s\n", yytname [yyr1[yyrule]]);
}

# define YY_REDUCE_PRINT(Rule)          \
do {                                    \
  if (yydebug)                          \
    yy_reduce_print (Rule);             \
} while (0)

/* Nonzero means print parse trace.  It is left uninitialized so that
   multiple parsers can coexist.  */
int yydebug;
#else /* !YYDEBUG */
# define YYDPRINTF(Args)
# define YYDSYMPRINT(Args)
# define YYDSYMPRINTF(Title, Token, Value, Location)
# define YY_STACK_PRINT(Bottom, Top)
# define YY_REDUCE_PRINT(Rule)
#endif /* !YYDEBUG */


/* YYINITDEPTH -- initial size of the parser's stacks.  */
#ifndef YYINITDEPTH
# define YYINITDEPTH 200
#endif

/* YYMAXDEPTH -- maximum size the stacks can grow to (effective only
   if the built-in stack extension method is used).

   Do not make this value too large; the results are undefined if
   SIZE_MAX < YYSTACK_BYTES (YYMAXDEPTH)
   evaluated with infinite-precision integer arithmetic.  */

#if YYMAXDEPTH == 0
# undef YYMAXDEPTH
#endif

#ifndef YYMAXDEPTH
# define YYMAXDEPTH 10000
#endif

\f

#if YYERROR_VERBOSE

# ifndef yystrlen
#  if defined (__GLIBC__) && defined (_STRING_H)
#   define yystrlen strlen
#  else
/* Return the length of YYSTR.  */
static YYSIZE_T
#   if defined (__STDC__) || defined (__cplusplus)
yystrlen (const char *yystr)
#   else
yystrlen (yystr)
     const char *yystr;
#   endif
{
  register const char *yys = yystr;

  while (*yys++ != '\0')
    continue;

  return yys - yystr - 1;
}
#  endif
# endif

# ifndef yystpcpy
#  if defined (__GLIBC__) && defined (_STRING_H) && defined (_GNU_SOURCE)
#   define yystpcpy stpcpy
#  else
/* Copy YYSRC to YYDEST, returning the address of the terminating '\0' in
   YYDEST.  */
static char *
#   if defined (__STDC__) || defined (__cplusplus)
yystpcpy (char *yydest, const char *yysrc)
#   else
yystpcpy (yydest, yysrc)
     char *yydest;
     const char *yysrc;
#   endif
{
  register char *yyd = yydest;
  register const char *yys = yysrc;

  while ((*yyd++ = *yys++) != '\0')
    continue;

  return yyd - 1;
}
#  endif
# endif

#endif /* !YYERROR_VERBOSE */

\f

#if YYDEBUG
/*--------------------------------.
| Print this symbol on YYOUTPUT.  |
`--------------------------------*/

#if defined (__STDC__) || defined (__cplusplus)
static void
yysymprint (FILE *yyoutput, int yytype, YYSTYPE *yyvaluep)
#else
static void
yysymprint (yyoutput, yytype, yyvaluep)
    FILE *yyoutput;
    int yytype;
    YYSTYPE *yyvaluep;
#endif
{
  /* Pacify ``unused variable'' warnings.  */
  (void) yyvaluep;

  if (yytype < YYNTOKENS)
    {
      YYFPRINTF (yyoutput, "token %s (", yytname[yytype]);
# ifdef YYPRINT
      YYPRINT (yyoutput, yytoknum[yytype], *yyvaluep);
# endif
    }
  else
    YYFPRINTF (yyoutput, "nterm %s (", yytname[yytype]);

  switch (yytype)
    {
      default:
        break;
    }
  YYFPRINTF (yyoutput, ")");
}

#endif /* ! YYDEBUG */
/*-----------------------------------------------.
| Release the memory associated to this symbol.  |
`-----------------------------------------------*/

#if defined (__STDC__) || defined (__cplusplus)
static void
yydestruct (int yytype, YYSTYPE *yyvaluep)
#else
static void
yydestruct (yytype, yyvaluep)
    int yytype;
    YYSTYPE *yyvaluep;
#endif
{
  /* Pacify ``unused variable'' warnings.  */
  (void) yyvaluep;

  switch (yytype)
    {

      default:
        break;
    }
}
\f

/* Prevent warnings from -Wmissing-prototypes.  */

#ifdef YYPARSE_PARAM
# if defined (__STDC__) || defined (__cplusplus)
int yyparse (void *YYPARSE_PARAM);
# else
int yyparse ();
# endif
#else /* ! YYPARSE_PARAM */
#if defined (__STDC__) || defined (__cplusplus)
int yyparse (void);
#else
int yyparse ();
#endif
#endif /* ! YYPARSE_PARAM */



/* The lookahead symbol.  */
int yychar;

/* The semantic value of the lookahead symbol.  */
YYSTYPE yylval;

/* Number of syntax errors so far.  */
int yynerrs;



/*----------.
| yyparse.  |
`----------*/

#ifdef YYPARSE_PARAM
# if defined (__STDC__) || defined (__cplusplus)
int yyparse (void *YYPARSE_PARAM)
# else
int yyparse (YYPARSE_PARAM)
  void *YYPARSE_PARAM;
# endif
#else /* ! YYPARSE_PARAM */
#if defined (__STDC__) || defined (__cplusplus)
int
yyparse (void)
#else
int
yyparse ()

#endif
#endif
{
  
  register int yystate;
  register int yyn;
  int yyresult;
  /* Number of tokens to shift before error messages enabled.  */
  int yyerrstatus;
  /* Lookahead token as an internal (translated) token number.  */
  int yytoken = 0;

  /* Three stacks and their tools:
     `yyss': related to states,
     `yyvs': related to semantic values,
     `yyls': related to locations.

     Refer to the stacks thru separate pointers, to allow yyoverflow
     to reallocate them elsewhere.  */

  /* The state stack.  */
  short yyssa[YYINITDEPTH];
  short *yyss = yyssa;
  register short *yyssp;

  /* The semantic value stack.  */
  YYSTYPE yyvsa[YYINITDEPTH];
  YYSTYPE *yyvs = yyvsa;
  register YYSTYPE *yyvsp;



#define YYPOPSTACK   (yyvsp--, yyssp--)

  YYSIZE_T yystacksize = YYINITDEPTH;

  /* The variables used to return semantic value and location from the
     action routines.  */
  YYSTYPE yyval;


  /* When reducing, the number of symbols on the RHS of the reduced
     rule.  */
  int yylen;

  YYDPRINTF ((stderr, "Starting parse\n"));

  yystate = 0;
  yyerrstatus = 0;
  yynerrs = 0;
  yychar = YYEMPTY;             /* Cause a token to be read.  */

  /* Initialize stack pointers.
     Waste one element of value and location stack
     so that they stay on the same level as the state stack.
     The wasted elements are never initialized.  */

  yyssp = yyss;
  yyvsp = yyvs;

  goto yysetstate;

/*------------------------------------------------------------.
| yynewstate -- Push a new state, which is found in yystate.  |
`------------------------------------------------------------*/
 yynewstate:
  /* In all cases, when you get here, the value and location stacks
     have just been pushed. so pushing a state here evens the stacks.
     */
  yyssp++;

 yysetstate:
  *yyssp = yystate;

  if (yyss + yystacksize - 1 <= yyssp)
    {
      /* Get the current used size of the three stacks, in elements.  */
      YYSIZE_T yysize = yyssp - yyss + 1;

#ifdef yyoverflow
      {
        /* Give user a chance to reallocate the stack. Use copies of
           these so that the &'s don't force the real ones into
           memory.  */
        YYSTYPE *yyvs1 = yyvs;
        short *yyss1 = yyss;


        /* Each stack pointer address is followed by the size of the
           data in use in that stack, in bytes.  This used to be a
           conditional around just the two extra args, but that might
           be undefined if yyoverflow is a macro.  */
        yyoverflow ("parser stack overflow",
                    &yyss1, yysize * sizeof (*yyssp),
                    &yyvs1, yysize * sizeof (*yyvsp),

                    &yystacksize);

        yyss = yyss1;
        yyvs = yyvs1;
      }
#else /* no yyoverflow */
# ifndef YYSTACK_RELOCATE
      goto yyoverflowlab;
# else
      /* Extend the stack our own way.  */
      if (YYMAXDEPTH <= yystacksize)
        goto yyoverflowlab;
      yystacksize *= 2;
      if (YYMAXDEPTH < yystacksize)
        yystacksize = YYMAXDEPTH;

      {
        short *yyss1 = yyss;
        union yyalloc *yyptr =
          (union yyalloc *) YYSTACK_ALLOC (YYSTACK_BYTES (yystacksize));
        if (! yyptr)
          goto yyoverflowlab;
        YYSTACK_RELOCATE (yyss);
        YYSTACK_RELOCATE (yyvs);

#  undef YYSTACK_RELOCATE
        if (yyss1 != yyssa)
          YYSTACK_FREE (yyss1);
      }
# endif
#endif /* no yyoverflow */

      yyssp = yyss + yysize - 1;
      yyvsp = yyvs + yysize - 1;


      YYDPRINTF ((stderr, "Stack size increased to %lu\n",
                  (unsigned long int) yystacksize));

      if (yyss + yystacksize - 1 <= yyssp)
        YYABORT;
    }

  YYDPRINTF ((stderr, "Entering state %d\n", yystate));

  goto yybackup;

/*-----------.
| yybackup.  |
`-----------*/
yybackup:

/* Do appropriate processing given the current state.  */
/* Read a lookahead token if we need one and don't already have one.  */
/* yyresume: */

  /* First try to decide what to do without reference to lookahead token.  */

  yyn = yypact[yystate];
  if (yyn == YYPACT_NINF)
    goto yydefault;

  /* Not known => get a lookahead token if don't already have one.  */

  /* YYCHAR is either YYEMPTY or YYEOF or a valid lookahead symbol.  */
  if (yychar == YYEMPTY)
    {
      YYDPRINTF ((stderr, "Reading a token: "));
      yychar = YYLEX;
    }

  if (yychar <= YYEOF)
    {
      yychar = yytoken = YYEOF;
      YYDPRINTF ((stderr, "Now at end of input.\n"));
    }
  else
    {
      yytoken = YYTRANSLATE (yychar);
      YYDSYMPRINTF ("Next token is", yytoken, &yylval, &yylloc);
    }

  /* If the proper action on seeing token YYTOKEN is to reduce or to
     detect an error, take that action.  */
  yyn += yytoken;
  if (yyn < 0 || YYLAST < yyn || yycheck[yyn] != yytoken)
    goto yydefault;
  yyn = yytable[yyn];
  if (yyn <= 0)
    {
      if (yyn == 0 || yyn == YYTABLE_NINF)
        goto yyerrlab;
      yyn = -yyn;
      goto yyreduce;
    }

  if (yyn == YYFINAL)
    YYACCEPT;

  /* Shift the lookahead token.  */
  YYDPRINTF ((stderr, "Shifting token %s, ", yytname[yytoken]));

  /* Discard the token being shifted unless it is eof.  */
  if (yychar != YYEOF)
    yychar = YYEMPTY;

  *++yyvsp = yylval;


  /* Count tokens shifted since error; after three, turn off error
     status.  */
  if (yyerrstatus)
    yyerrstatus--;

  yystate = yyn;
  goto yynewstate;


/*-----------------------------------------------------------.
| yydefault -- do the default action for the current state.  |
`-----------------------------------------------------------*/
yydefault:
  yyn = yydefact[yystate];
  if (yyn == 0)
    goto yyerrlab;
  goto yyreduce;


/*-----------------------------.
| yyreduce -- Do a reduction.  |
`-----------------------------*/
yyreduce:
  /* yyn is the number of a rule to reduce with.  */
  yylen = yyr2[yyn];

  /* If YYLEN is nonzero, implement the default value of the action:
     `$$ = $1'.

     Otherwise, the following line sets YYVAL to garbage.
     This behavior is undocumented and Bison
     users should not rely upon it.  Assigning to YYVAL
     unconditionally makes the parser a bit smaller, and it avoids a
     GCC warning that YYVAL may be used uninitialized.  */
  yyval = yyvsp[1-yylen];


  YY_REDUCE_PRINT (yyn);
  switch (yyn)
    {
        case 4:
    {
            yyHaveTime++;
#ifdef lint
            /* I am compulsive about lint natterings... */
            if (yyHaveTime == -1) {
                YYERROR;
            }
#endif /* lint */
        }
    break;

  case 5:
    {
            yyHaveTime++;
            yyTimezone = yyvsp[0].Number;
        }
    break;

  case 6:
    {
            yyHaveDate++;
        }
    break;

  case 7:
    {
            yyHaveRel = 1;
        }
    break;

  case 8:
    {
            if (yyvsp[-1].Number < 100) {
                yyHour = yyvsp[-1].Number;
                yyMinutes = 0;
            }
            else {
                yyHour = yyvsp[-1].Number / 100;
                yyMinutes = yyvsp[-1].Number % 100;
            }
            yySeconds = 0;
            yyMeridian = yyvsp[0].Meridian;
        }
    break;

  case 9:
    {
            yyHour = yyvsp[-3].Number;
            yyMinutes = yyvsp[-1].Number;
            yySeconds = 0;
            yyMeridian = yyvsp[0].Meridian;
        }
    break;

  case 10:
    {
            yyHour = yyvsp[-3].Number;
            yyMinutes = yyvsp[-1].Number;
            yyTimezone = yyvsp[0].Number;
            yyMeridian = MER24;
            yyDSTmode = DSToff;
        }
    break;

  case 11:
    {
            yyHour = yyvsp[-5].Number;
            yyMinutes = yyvsp[-3].Number;
            yySeconds = yyvsp[-1].Number;
            yyMeridian = yyvsp[0].Meridian;
        }
    break;

  case 12:
    {
            yyHour = yyvsp[-5].Number;
            yyMinutes = yyvsp[-3].Number;
            yySeconds = yyvsp[-1].Number;
            yyTimezone = yyvsp[0].Number;
            yyMeridian = MER24;
            yyDSTmode = DSToff;
        }
    break;

  case 13:
    {
            yyval.Number = yyvsp[0].Number;
            yyDSTmode = DSToff;
        }
    break;

  case 14:
    {
            yyval.Number = yyvsp[0].Number;
            yyDSTmode = DSTon;
        }
    break;

  case 15:
    {
            /* Only allow "GMT+300" and "GMT-0800" */
            if (yyvsp[-1].Number != 0) {
                YYABORT;
            }
            yyval.Number = yyvsp[0].Number;
            yyDSTmode = DSToff;
        }
    break;

  case 16:
    {
            yyval.Number = yyvsp[0].Number;
            yyDSTmode = DSToff;
        }
    break;

  case 17:
    {
            int         i;

            /* Unix and GMT and numeric timezones -- a little confusing. */
            if (yyvsp[0].Number < 0) {
                /* Don't work with negative modulus. */
                yyvsp[0].Number = -yyvsp[0].Number;
                if (yyvsp[0].Number > 9999 || (i = yyvsp[0].Number % 100) >= 60) {
                    YYABORT;
                }
                yyval.Number = (yyvsp[0].Number / 100) * 60 + i;
            }
            else {
                if (yyvsp[0].Number > 9999 || (i = yyvsp[0].Number % 100) >= 60) {
                    YYABORT;
                }
                yyval.Number = -((yyvsp[0].Number / 100) * 60 + i);
            }
        }
    break;

  case 18:
    {
            yyMonth = yyvsp[-2].Number;
            yyDay = yyvsp[0].Number;
        }
    break;

  case 19:
    {
            if (yyvsp[-4].Number > 100) {
                yyYear = yyvsp[-4].Number;
                yyMonth = yyvsp[-2].Number;
                yyDay = yyvsp[0].Number;
            }
            else {
                yyMonth = yyvsp[-4].Number;
                yyDay = yyvsp[-2].Number;
                yyYear = yyvsp[0].Number;
            }
        }
    break;

  case 20:
    {
            yyMonth = yyvsp[-1].Number;
            yyDay = yyvsp[0].Number;
        }
    break;

  case 21:
    {
            yyMonth = yyvsp[-3].Number;
            yyDay = yyvsp[-2].Number;
            yyYear = yyvsp[0].Number;
        }
    break;

  case 22:
    {
            yyDay = yyvsp[-1].Number;
            yyMonth = yyvsp[0].Number;
        }
    break;

  case 23:
    {
            yyDay = yyvsp[-2].Number;
            yyMonth = yyvsp[-1].Number;
            yyYear = yyvsp[0].Number;
        }
    break;

  case 24:
    {
            yyDay = yyvsp[-2].Number;
            yyMonth = yyvsp[-1].Number;
            yyYear = yyvsp[0].Number;
        }
    break;

  case 25:
    {
            yyRelSeconds += yyvsp[-1].Number * yyvsp[0].Number;
        }
    break;

  case 26:
    {
            yyRelSeconds += yyvsp[-1].Number * yyvsp[0].Number;
        }
    break;

  case 27:
    {
            yyRelMonth += yyvsp[-1].Number * yyvsp[0].Number;
        }
    break;

  case 28:
    {
            yyRelMonth += yyvsp[-1].Number * yyvsp[0].Number;
        }
    break;

  case 29:
    {
            yyval.Meridian = MER24;
        }
    break;

  case 30:
    {
            yyval.Meridian = yyvsp[0].Meridian;
        }
    break;


    }

/* Line 999 of yacc.c.  */
#line 1410 "y.tab.c"
\f
  yyvsp -= yylen;
  yyssp -= yylen;


  YY_STACK_PRINT (yyss, yyssp);

  *++yyvsp = yyval;


  /* Now `shift' the result of the reduction.  Determine what state
     that goes to, based on the state we popped back to and the rule
     number reduced by.  */

  yyn = yyr1[yyn];

  yystate = yypgoto[yyn - YYNTOKENS] + *yyssp;
  if (0 <= yystate && yystate <= YYLAST && yycheck[yystate] == *yyssp)
    yystate = yytable[yystate];
  else
    yystate = yydefgoto[yyn - YYNTOKENS];

  goto yynewstate;


/*------------------------------------.
| yyerrlab -- here on detecting error |
`------------------------------------*/
yyerrlab:
  /* If not already recovering from an error, report this error.  */
  if (!yyerrstatus)
    {
      ++yynerrs;
#if YYERROR_VERBOSE
      yyn = yypact[yystate];

      if (YYPACT_NINF < yyn && yyn < YYLAST)
        {
          YYSIZE_T yysize = 0;
          int yytype = YYTRANSLATE (yychar);
          char *yymsg;
          int yyx, yycount;

          yycount = 0;
          /* Start YYX at -YYN if negative to avoid negative indexes in
             YYCHECK.  */
          for (yyx = yyn < 0 ? -yyn : 0;
               yyx < (int) (sizeof (yytname) / sizeof (char *)); yyx++)
            if (yycheck[yyx + yyn] == yyx && yyx != YYTERROR)
              yysize += yystrlen (yytname[yyx]) + 15, yycount++;
          yysize += yystrlen ("syntax error, unexpected ") + 1;
          yysize += yystrlen (yytname[yytype]);
          yymsg = (char *) YYSTACK_ALLOC (yysize);
          if (yymsg != 0)
            {
              char *yyp = yystpcpy (yymsg, "syntax error, unexpected ");
              yyp = yystpcpy (yyp, yytname[yytype]);

              if (yycount < 5)
                {
                  yycount = 0;
                  for (yyx = yyn < 0 ? -yyn : 0;
                       yyx < (int) (sizeof (yytname) / sizeof (char *));
                       yyx++)
                    if (yycheck[yyx + yyn] == yyx && yyx != YYTERROR)
                      {
                        const char *yyq = ! yycount ? ", expecting " : " or ";
                        yyp = yystpcpy (yyp, yyq);
                        yyp = yystpcpy (yyp, yytname[yyx]);
                        yycount++;
                      }
                }
              yyerror (yymsg);
              YYSTACK_FREE (yymsg);
            }
          else
            yyerror ("syntax error; also virtual memory exhausted");
        }
      else
#endif /* YYERROR_VERBOSE */
        yyerror ("syntax error");
    }



  if (yyerrstatus == 3)
    {
      /* If just tried and failed to reuse lookahead token after an
         error, discard it.  */

      /* Return failure if at end of input.  */
      if (yychar == YYEOF)
        {
          /* Pop the error token.  */
          YYPOPSTACK;
          /* Pop the rest of the stack.  */
          while (yyss < yyssp)
            {
              YYDSYMPRINTF ("Error: popping", yystos[*yyssp], yyvsp, yylsp);
              yydestruct (yystos[*yyssp], yyvsp);
              YYPOPSTACK;
            }
          YYABORT;
        }

      YYDSYMPRINTF ("Error: discarding", yytoken, &yylval, &yylloc);
      yydestruct (yytoken, &yylval);
      yychar = YYEMPTY;

    }

  /* Else will try to reuse lookahead token after shifting the error
     token.  */
  goto yyerrlab1;


/*----------------------------------------------------.
| yyerrlab1 -- error raised explicitly by an action.  |
`----------------------------------------------------*/
yyerrlab1:
  yyerrstatus = 3;      /* Each real token shifted decrements this.  */

  for (;;)
    {
      yyn = yypact[yystate];
      if (yyn != YYPACT_NINF)
        {
          yyn += YYTERROR;
          if (0 <= yyn && yyn <= YYLAST && yycheck[yyn] == YYTERROR)
            {
              yyn = yytable[yyn];
              if (0 < yyn)
                break;
            }
        }

      /* Pop the current state because it cannot handle the error token.  */
      if (yyssp == yyss)
        YYABORT;

      YYDSYMPRINTF ("Error: popping", yystos[*yyssp], yyvsp, yylsp);
      yydestruct (yystos[yystate], yyvsp);
      yyvsp--;
      yystate = *--yyssp;

      YY_STACK_PRINT (yyss, yyssp);
    }

  if (yyn == YYFINAL)
    YYACCEPT;

  YYDPRINTF ((stderr, "Shifting error token, "));

  *++yyvsp = yylval;


  yystate = yyn;
  goto yynewstate;


/*-------------------------------------.
| yyacceptlab -- YYACCEPT comes here.  |
`-------------------------------------*/
yyacceptlab:
  yyresult = 0;
  goto yyreturn;

/*-----------------------------------.
| yyabortlab -- YYABORT comes here.  |
`-----------------------------------*/
yyabortlab:
  yyresult = 1;
  goto yyreturn;

#ifndef yyoverflow
/*----------------------------------------------.
| yyoverflowlab -- parser overflow comes here.  |
`----------------------------------------------*/
yyoverflowlab:
  yyerror ("parser stack overflow");
  yyresult = 2;
  /* Fall through.  */
#endif

yyreturn:
#ifndef yyoverflow
  if (yyss != yyssa)
    YYSTACK_FREE (yyss);
#endif
  return yyresult;
}




/* 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 },
    { "october",        tMONTH, 10 },
    { "november",       tMONTH, 11 },
    { "december",       tMONTH, 12 },
        /* The value of the day isn't used... */
    { "sunday",         tDAY, 0 },
    { "monday",         tDAY, 0 },
    { "tuesday",        tDAY, 0 },
    { "wednesday",      tDAY, 0 },
    { "thursday",       tDAY, 0 },
    { "friday",         tDAY, 0 },
    { "saturday",       tDAY, 0 },
};

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

/* Timezone table. */
static TABLE    TimezoneTable[] = {
    { "gmt",    tZONE,     HOUR( 0) },  /* Greenwich Mean */
    { "ut",     tZONE,     HOUR( 0) },  /* Universal */
    { "utc",    tZONE,     HOUR( 0) },  /* Universal Coordinated */
    { "cut",    tZONE,     HOUR( 0) },  /* Coordinated Universal */
    { "z",      tZONE,     HOUR( 0) },  /* Greenwich Mean */
    { "wet",    tZONE,     HOUR( 0) },  /* Western European */
    { "bst",    tDAYZONE,  HOUR( 0) },  /* British Summer */
    { "nst",    tZONE,     HOUR(3)+30 }, /* Newfoundland Standard */
    { "ndt",    tDAYZONE,  HOUR(3)+30 }, /* 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 */
    { "akst",   tZONE,     HOUR( 9) },  /* Alaska Standard */
    { "akdt",   tDAYZONE,  HOUR( 9) },  /* Alaska Daylight */
    { "hst",    tZONE,     HOUR(10) },  /* Hawaii Standard */
    { "hast",   tZONE,     HOUR(10) },  /* Hawaii-Aleutian Standard */
    { "hadt",   tDAYZONE,  HOUR(10) },  /* Hawaii-Aleutian Daylight */
    { "ces",    tDAYZONE,  -HOUR(1) },  /* Central European Summer */
    { "cest",   tDAYZONE,  -HOUR(1) },  /* Central European Summer */
    { "mez",    tZONE,     -HOUR(1) },  /* Middle European */
    { "mezt",   tDAYZONE,  -HOUR(1) },  /* Middle European Summer */
    { "cet",    tZONE,     -HOUR(1) },  /* Central European */
    { "met",    tZONE,     -HOUR(1) },  /* Middle European */
    { "eet",    tZONE,     -HOUR(2) },  /* Eastern Europe */
    { "msk",    tZONE,     -HOUR(3) },  /* Moscow Winter */
    { "msd",    tDAYZONE,  -HOUR(3) },  /* Moscow Summer */
    { "wast",   tZONE,     -HOUR(8) },  /* West Australian Standard */
    { "wadt",   tDAYZONE,  -HOUR(8) },  /* West Australian Daylight */
    { "hkt",    tZONE,     -HOUR(8) },  /* Hong Kong */
    { "cct",    tZONE,     -HOUR(8) },  /* China Coast */
    { "jst",    tZONE,     -HOUR(9) },  /* Japan Standard */
    { "kst",    tZONE,     -HOUR(9) },  /* Korean Standard */
    { "kdt",    tZONE,     -HOUR(9) },  /* Korean Daylight */
    { "cast",   tZONE,     -(HOUR(9)+30) }, /* Central Australian Standard */
    { "cadt",   tDAYZONE,  -(HOUR(9)+30) }, /* Central Australian Daylight */
    { "east",   tZONE,     -HOUR(10) }, /* Eastern Australian Standard */
    { "eadt",   tDAYZONE,  -HOUR(10) }, /* Eastern Australian Daylight */
    { "nzst",   tZONE,     -HOUR(12) }, /* New Zealand Standard */
    { "nzdt",   tDAYZONE,  -HOUR(12) }, /* New Zealand Daylight */

    /* For completeness we include the following entries. */
#if 0

    /* Duplicate names.  Either they conflict with a zone listed above
     * (which is either more likely to be seen or just been in circulation
     * longer), or they conflict with another zone in this section and
     * we could not reasonably choose one over the other. */
    { "fst",    tZONE,     HOUR( 2) },  /* Fernando De Noronha Standard */
    { "fdt",    tDAYZONE,  HOUR( 2) },  /* Fernando De Noronha Daylight */
    { "bst",    tZONE,     HOUR( 3) },  /* Brazil Standard */
    { "est",    tZONE,     HOUR( 3) },  /* Eastern Standard (Brazil) */
    { "edt",    tDAYZONE,  HOUR( 3) },  /* Eastern Daylight (Brazil) */
    { "wst",    tZONE,     HOUR( 4) },  /* Western Standard (Brazil) */
    { "wdt",    tDAYZONE,  HOUR( 4) },  /* Western Daylight (Brazil) */
    { "cst",    tZONE,     HOUR( 5) },  /* Chile Standard */
    { "cdt",    tDAYZONE,  HOUR( 5) },  /* Chile Daylight */
    { "ast",    tZONE,     HOUR( 5) },  /* Acre Standard */
    { "adt",    tDAYZONE,  HOUR( 5) },  /* Acre Daylight */
    { "cst",    tZONE,     HOUR( 5) },  /* Cuba Standard */
    { "cdt",    tDAYZONE,  HOUR( 5) },  /* Cuba Daylight */
    { "est",    tZONE,     HOUR( 6) },  /* Easter Island Standard */
    { "edt",    tDAYZONE,  HOUR( 6) },  /* Easter Island Daylight */
    { "sst",    tZONE,     HOUR(11) },  /* Samoa Standard */
    { "ist",    tZONE,     -HOUR(2) },  /* Israel Standard */
    { "idt",    tDAYZONE,  -HOUR(2) },  /* Israel Daylight */
    { "idt",    tDAYZONE,  -(HOUR(3)+30) }, /* Iran Daylight */
    { "ist",    tZONE,     -(HOUR(3)+30) }, /* Iran Standard */
    { "cst",     tZONE,     -HOUR(8) }, /* China Standard */
    { "cdt",     tDAYZONE,  -HOUR(8) }, /* China Daylight */
    { "sst",     tZONE,     -HOUR(8) }, /* Singapore Standard */

    /* Dubious (e.g., not in Olson's TIMEZONE package) or obsolete. */
    { "gst",    tZONE,     HOUR( 3) },  /* Greenland Standard */
    { "wat",    tZONE,     -HOUR(1) },  /* West Africa */
    { "at",     tZONE,     HOUR( 2) },  /* Azores */
    { "gst",    tZONE,     -HOUR(10) }, /* Guam Standard */
    { "nft",    tZONE,     HOUR(3)+30 }, /* Newfoundland */
    { "idlw",   tZONE,     HOUR(12) },  /* International Date Line West */
    { "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 */
    { "bt",     tZONE,     -HOUR(3) },  /* Baghdad */
    { "it",     tZONE,     -(HOUR(3)+30) }, /* Iran */
    { "zp4",    tZONE,     -HOUR(4) },  /* USSR Zone 3 */
    { "zp5",    tZONE,     -HOUR(5) },  /* USSR Zone 4 */
    { "ist",    tZONE,     -(HOUR(5)+30) }, /* Indian Standard */
    { "zp6",    tZONE,     -HOUR(6) },  /* USSR Zone 5 */
    { "nst",    tZONE,     -HOUR(7) },  /* North Sumatra */
    { "sst",    tZONE,     -HOUR(7) },  /* South Sumatra */
    { "jt",     tZONE,     -(HOUR(7)+30) }, /* Java (3pm in Cronusland!) */
    { "nzt",    tZONE,     -HOUR(12) }, /* New Zealand */
    { "idle",   tZONE,     -HOUR(12) }, /* International Date Line East */
    { "cat",    tZONE,     HOUR(10) },  /* -- expired 1967 */
    { "nt",     tZONE,     HOUR(11) },  /* -- expired 1967 */
    { "ahst",   tZONE,     HOUR(10) },  /* -- expired 1983 */
    { "hdt",    tDAYZONE,  HOUR(10) },  /* -- expired 1986 */
#endif /* 0 */
};


/* ARGSUSED */
static void
date_error(char *s)
{
    /* NOTREACHED */
}


static time_t
ToSeconds(time_t Hours, time_t Minutes, time_t Seconds, MERIDIAN Meridian)
{
    if (Minutes < 0 || Minutes > 59 || Seconds < 0 || Seconds > 61)
        return -1;
    if (Meridian == MER24) {
        if (Hours < 0 || Hours > 23)
            return -1;
    }
    else {
        if (Hours < 1 || Hours > 12)
            return -1;
        if (Hours == 12)
            Hours = 0;
        if (Meridian == MERpm)
            Hours += 12;
    }
    return (Hours * 60L + Minutes) * 60L + Seconds;
}


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 dst)
{
    static int  DaysNormal[13] = {
        0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
    };
    static int  DaysLeap[13] = {
        0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
    };
    static int  LeapYears[] = {
        1972, 1976, 1980, 1984, 1988, 1992, 1996,
        2000, 2004, 2008, 2012, 2016, 2020, 2024, 2028, 2032, 2036
    };
    register int        *yp;
    register int        *mp;
    register time_t     Julian;
    register int        i;
    time_t              tod;

    if (Year < 0)
        Year = -Year;
    if (Year < 100)
        Year += 1900;
    if (Year < EPOCH)
        Year += 100;
    for (mp = DaysNormal, yp = LeapYears; yp < ENDOF(LeapYears); yp++)
        if (Year == *yp) {
            mp = DaysLeap;
            break;
        }
    if (Year < EPOCH || Year > END_OF_TIME
     || Month < 1 || Month > 12
     /* NOSTRICT *//* conversion from long may lose accuracy */
     || Day < 1 || Day > mp[(int)Month])
        return -1;

    Julian = Day - 1 + (Year - EPOCH) * 365;
    for (yp = LeapYears; yp < ENDOF(LeapYears); yp++, Julian++)
        if (Year <= *yp)
            break;
    for (i = 1; i < Month; i++)
        Julian += *++mp;
    Julian *= SECSPERDAY;
    Julian += yyTimezone * 60L;
    if ((tod = ToSeconds(Hours, Minutes, Seconds, Meridian)) < 0)
        return -1;
    Julian += tod;
    tod = Julian;
    if (dst == DSTon || (dst == DSTmaybe && localtime(&tod)->tm_isdst))
        Julian -= DST_OFFSET * 60L * 60L;
    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) * DST_OFFSET * 60L * 60L;
}


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

    tm = localtime(&Start);
    Month = 12 * tm->tm_year + 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, register int length)
{
    register char       *p;
    register char       *q;
    register TABLE      *tp;
    register int        c;

    p = buff;
    c = p[0];

    /* See if we have an abbreviation for a month. */
    if (length == 3 || (length == 4 && p[3] == '.'))
        for (tp = MonthDayTable; tp < ENDOF(MonthDayTable); tp++) {
            q = tp->name;
            if (c == q[0] && p[1] == q[1] && p[2] == q[2]) {
                yylval.Number = tp->value;
                return tp->type;
            }
        }
    else
        for (tp = MonthDayTable; tp < ENDOF(MonthDayTable); tp++)
            if (c == tp->name[0] && strcmp(p, tp->name) == 0) {
                yylval.Number = tp->value;
                return tp->type;
            }

    /* Try for a timezone. */
    for (tp = TimezoneTable; tp < ENDOF(TimezoneTable); tp++)
        if (c == tp->name[0] && p[1] == tp->name[1]
         && strcmp(p, tp->name) == 0) {
            yylval.Number = tp->value;
            return tp->type;
        }

    /* Try the units table. */
    for (tp = UnitsTable; tp < ENDOF(UnitsTable); tp++)
        if (c == tp->name[0] && strcmp(p, tp->name) == 0) {
            yylval.Number = tp->value;
            return tp->type;
        }

    /* Strip off any plural and try the units table again. */
    if (--length > 0 && p[length] == 's') {
        p[length] = '\0';
        for (tp = UnitsTable; tp < ENDOF(UnitsTable); tp++)
            if (c == tp->name[0] && strcmp(p, tp->name) == 0) {
                p[length] = 's';
                yylval.Number = tp->value;
                return tp->type;
            }
        p[length] = 's';
    }
    length++;

    /* Drop out any periods. */
    for (p = buff, q = (char*)buff; *q; q++)
        if (*q != '.')
            *p++ = *q;
    *p = '\0';

    /* Try the meridians. */
    if (buff[1] == 'm' && buff[2] == '\0') {
        if (buff[0] == 'a') {
            yylval.Meridian = MERam;
            return tMERIDIAN;
        }
        if (buff[0] == 'p') {
            yylval.Meridian = MERpm;
            return tMERIDIAN;
        }
    }

    /* If we saw any periods, try the timezones again. */
    if (p - buff != length) {
        c = buff[0];
        for (p = buff, tp = TimezoneTable; tp < ENDOF(TimezoneTable); tp++)
            if (c == tp->name[0] && p[1] == tp->name[1]
            && strcmp(p, tp->name) == 0) {
                yylval.Number = tp->value;
                return tp->type;
            }
    }

    /* Unknown word -- assume GMT timezone. */
    yylval.Number = 0;
    return tZONE;
}


int
date_lex(void)
{
    register char       c;
    register char       *p;
    char                buff[20];
    register int        sign;
    register int        i;
    register int        nesting;

    for ( ; ; ) {
        /* Get first character after the whitespace. */
        for ( ; ; ) {
            while (isspace(*yyInput))
                yyInput++;
            c = *yyInput;

            /* Ignore RFC 822 comments, typically time zone names. */
            if (c != LPAREN)
                break;
            for (nesting = 1; (c = *++yyInput) != RPAREN || --nesting; )
                if (c == LPAREN)
                    nesting++;
                else if (!IS7BIT(c) || c == '\0' || c == '\r'
                     || (c == '\\' && ((c = *++yyInput) == '\0' || !IS7BIT(c))))
                    /* Lexical error: bad comment. */
                    return '?';
            yyInput++;
        }

        /* A number? */
        if (isdigit(c) || c == '-' || c == '+') {
            if (c == '-' || c == '+') {
                sign = c == '-' ? -1 : 1;
                yyInput++;
                if (!isdigit(*yyInput))
                    /* Skip the plus or minus sign. */
                    continue;
            }
            else
                sign = 0;
            for (i = 0; (c = *yyInput++) != '\0' && isdigit(c); )
                i = 10 * i + c - '0';
            yyInput--;
            yylval.Number = sign < 0 ? -i : i;
            return sign ? tSNUMBER : tUNUMBER;
        }

        /* A word? */
        if (isalpha(c)) {
            for (p = buff; (c = *yyInput++) == '.' || isalpha(c); )
                if (p < &buff[sizeof buff - 1])
                    *p++ = isupper(c) ? tolower(c) : c;
            *p = '\0';
            yyInput--;
            return LookupWord(buff, p - buff);
        }

        return *yyInput++;
    }
}


time_t
parsedate(char *p)
{
    extern int          date_parse(void);
    time_t              Start;

    yyInput = p;

    yyYear = 0;
    yyMonth = 0;
    yyDay = 0;
    yyTimezone = 0;
    yyDSTmode = DSTmaybe;
    yyHour = 0;
    yyMinutes = 0;
    yySeconds = 0;
    yyMeridian = MER24;
    yyRelSeconds = 0;
    yyRelMonth = 0;
    yyHaveDate = 0;
    yyHaveRel = 0;
    yyHaveTime = 0;

    if (date_parse() || yyHaveTime > 1 || yyHaveDate > 1)
        return -1;

    if (yyHaveDate || yyHaveTime) {
        Start = Convert(yyMonth, yyDay, yyYear, yyHour, yyMinutes, yySeconds,
                    yyMeridian, yyDSTmode);
        if (Start < 0)
            return -1;
    }
    else
        return -1;

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

    /* 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;
}


#ifdef TEST

#if YYDEBUG
extern int      yydebug;
#endif /* YYDEBUG */

/* ARGSUSED */
int
main(int ac, char *av[])
{
    char        buff[128];
    time_t      d;

#if YYDEBUG
    yydebug = 1;
#endif /* YYDEBUG */

    (void)printf("Enter date, or blank line to exit.\n\t> ");
    for ( ; ; ) {
        (void)printf("\t> ");
        (void)fflush(stdout);
        if (fgets(buff, sizeof buff, stdin) == NULL || buff[0] == '\n')
            break;
#if YYDEBUG
        if (strcmp(buff, "yydebug") == 0) {
            yydebug = !yydebug;
            printf("yydebug = %s\n", yydebug ? "on" : "off");
            continue;
        }
#endif /* YYDEBUG */
        d = parsedate(buff, (TIMEINFO *)NULL);
        if (d == -1)
            (void)printf("Bad format - couldn't convert.\n");
        else
            (void)printf("%s", ctime(&d));
    }

    exit(0);
    /* NOTREACHED */
}
#endif /* TEST */