/* A Bison parser, made by GNU Bison 3.5.1.  */

/* Bison implementation for Yacc-like parsers in C

   Copyright (C) 1984, 1989-1990, 2000-2015, 2018-2020 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 3 of the License, 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, see <http://www.gnu.org/licenses/>.  */

/* As a special exception, you may create a larger work that contains
   part or all of the Bison parser skeleton and distribute that work
   under terms of your choice, so long as that work isn't itself a
   parser generator using the skeleton or a modified version thereof
   as a parser skeleton.  Alternatively, if you modify or redistribute
   the parser skeleton itself, you may (at your option) remove this
   special exception, which will cause the skeleton and the resulting
   Bison output files to be licensed under the GNU General Public
   License without this special exception.

   This special exception was added by the Free Software Foundation in
   version 2.2 of Bison.  */

/* C LALR(1) parser skeleton 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.  */

/* Undocumented macros, especially those whose name start with YY_,
   are private implementation details.  Do not rely on them.  */

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

/* Bison version.  */
#define YYBISON_VERSION "3.5.1"

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

/* Pure parsers.  */
#define YYPURE 1

/* Push parsers.  */
#define YYPUSH 0

/* Pull parsers.  */
#define YYPULL 1

/* First part of user prologue.  */
#line 1 "common/parse-datetime.y"

/* Parse a string into an internal time stamp.

   Copyright (C) 1999-2000, 2002-2015 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or modify it
   under the terms of the GNU Lesser General Public License as published
   by the Free Software Foundation; either version 2 of the License, 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, see <http://www.gnu.org/licenses/>.  */

/* 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.

   Modified by Paul Eggert <eggert@twinsun.com> in August 1999 to do
   the right thing about local DST.  Also modified by Paul Eggert
   <eggert@cs.ucla.edu> in February 2004 to support
   nanosecond-resolution time stamps, and in October 2004 to support
   TZ strings in dates.  */

/* FIXME: Check for arithmetic overflow in all cases, not just
   some of them.  */

#include "config.h"
#include "parsedatetime.h"
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include <sys/time.h>
#include <glib.h>
#include <stdint.h>

/* There's no need to extend the stack, so there's no need to involve
   alloca.  */
#define YYSTACK_USE_ALLOCA 0

static char *xmemdup(void const *p, size_t s)
{
    char *result = (char *)g_malloc(s);
    memcpy(result, p, s);
    return result;
}

static void gettime(struct timespec *ts)
{
#ifdef HAVE_NANOTIME
    nanotime(ts);
#else

#if defined(CLOCK_REALTIME) && defined(HAVE_CLOCK_GETTIME)
    if (clock_gettime(CLOCK_REALTIME, ts) == 0)
        return;
#endif

    {
        struct timeval tv;
        gettimeofday(&tv, NULL);
        ts->tv_sec = tv.tv_sec;
        ts->tv_nsec = tv.tv_usec * 1000;
    }

#endif
}

/* Tell Bison how much stack space is needed.  20 should be plenty for
   this grammar, which is not right recursive.  Beware setting it too
   high, since that might cause problems on machines whose
   implementations have lame stack-overflow checking.  */
#define YYMAXDEPTH 20
#define YYINITDEPTH YYMAXDEPTH

/* Since the code of parse-datetime.y is not included in the Emacs executable
   itself, there is no need to #define static in this file.  Even if
   the code were included in the Emacs executable, it probably
   wouldn't do any harm to #undef it here; this will only cause
   problems if we try to write to a static variable, which I don't
   think this code needs to do.  */
#ifdef emacs
#undef static
#endif

#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/* Bison's skeleton tests _STDLIB_H, while some stdlib.h headers
   use _STDLIB_H_ as witness.  Map the latter to the one bison uses.  */
/* FIXME: this is temporary.  Remove when we have a mechanism to ensure
   that the version we're using is fixed, too.  */
#ifdef _STDLIB_H_
#undef _STDLIB_H
#define _STDLIB_H 1
#endif

/* ISDIGIT differs from isdigit, as follows:
   - Its arg may be any int or unsigned int; it need not be an unsigned char
     or EOF.
   - It's typically faster.
   POSIX says that only '0' through '9' are digits.  Prefer ISDIGIT to
   isdigit unless it's important to use the locale's definition
   of "digit" even when the host does not conform to POSIX.  */
#define ISDIGIT(c) ((unsigned int)(c) - '0' <= 9)

/* Shift A right by B bits portably, by dividing A by 2**B and
   truncating towards minus infinity.  A and B should be free of side
   effects, and B should be in the range 0 <= B <= INT_BITS - 2, where
   INT_BITS is the number of useful bits in an int.  GNU code can
   assume that INT_BITS is at least 32.

   ISO C99 says that A >> B is implementation-defined if A < 0.  Some
   implementations (e.g., UNICOS 9.0 on a Cray Y-MP EL) don't shift
   right in the usual way when A < 0, so SHR falls back on division if
   ordinary A >> B doesn't seem to be the usual signed shift.  */
#define SHR(a, b) (-1 >> 1 == -1 ? (a) >> (b) : (a) / (1 << (b)) - ((a) % (1 << (b)) < 0))

#define EPOCH_YEAR 1970
#define TM_YEAR_BASE 1900

#define HOUR(x) ((x) * 60)

/* Convert a possibly-signed character to an unsigned character.  This is
   a bit safer than casting to unsigned char, since it catches some type
   errors that the cast doesn't.  */
static unsigned char to_uchar(char ch)
{
    return ch;
}

/* FIXME: It also assumes that signed integer overflow silently wraps around,
   but this is not true any more with recent versions of GCC 4.  */

/* An integer value, and the number of digits in its textual
   representation.  */
typedef struct
{
    bool negative;
    long int value;
    size_t digits;
} textint;

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

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

enum
{
    BILLION = 1000000000,
    LOG10_BILLION = 9
};

/* Relative times.  */
typedef struct
{
    /* Relative year, month, day, hour, minutes, seconds, and nanoseconds.  */
    long int year;
    long int month;
    long int day;
    long int hour;
    long int minutes;
    intmax_t seconds;
    int ns;
} relative_time;

#define RELATIVE_TIME_0 ((relative_time){ 0, 0, 0, 0, 0, 0, 0 })

/* Information passed to and from the parser.  */
typedef struct
{
    /* The input string remaining to be parsed. */
    const char *input;

    /* N, if this is the Nth Tuesday.  */
    long int day_ordinal;

    /* Day of week; Sunday is 0.  */
    int day_number;

    /* tm_isdst flag for the local zone.  */
    int local_isdst;

    /* Time zone, in minutes east of UTC.  */
    long int time_zone;

    /* Style used for time.  */
    int meridian;

    /* Gregorian year, month, day, hour, minutes, seconds, and nanoseconds.  */
    textint year;
    long int month;
    long int day;
    long int hour;
    long int minutes;
    struct timespec seconds; /* includes nanoseconds */

    /* Relative year, month, day, hour, minutes, seconds, and nanoseconds.  */
    relative_time rel;

    /* Presence or counts of nonterminals of various flavors parsed so far.  */
    bool timespec_seen;
    bool rels_seen;
    size_t dates_seen;
    size_t days_seen;
    size_t local_zones_seen;
    size_t dsts_seen;
    size_t times_seen;
    size_t zones_seen;

    /* Table of local time zone abbreviations, terminated by a null entry.  */
    table local_time_zone_table[3];
} parser_control;

union YYSTYPE;
static int yylex(union YYSTYPE *, parser_control *);
static int yyerror(parser_control const *, char const *);
static long int time_zone_hhmm(parser_control *, textint, long int);

/* Extract into *PC any date and time info from a string of digits
   of the form e.g., YYYYMMDD, YYMMDD, HHMM, HH (and sometimes YYY,
   YYYY, ...).  */
static void digits_to_date_time(parser_control *pc, textint text_int)
{
    if (pc->dates_seen && !pc->year.digits && !pc->rels_seen && (pc->times_seen || 2 < text_int.digits))
    {
        pc->year = text_int;
    }
    else
    {
        if (4 < text_int.digits)
        {
            pc->dates_seen++;
            pc->day = text_int.value % 100;
            pc->month = (text_int.value / 100) % 100;
            pc->year.value = text_int.value / 10000;
            pc->year.digits = text_int.digits - 4;
        }
        else
        {
            pc->times_seen++;
            if (text_int.digits <= 2)
            {
                pc->hour = text_int.value;
                pc->minutes = 0;
            }
            else
            {
                pc->hour = text_int.value / 100;
                pc->minutes = text_int.value % 100;
            }
            pc->seconds.tv_sec = 0;
            pc->seconds.tv_nsec = 0;
            pc->meridian = MER24;
        }
    }
}

/* Increment PC->rel by FACTOR * REL (FACTOR is 1 or -1).  */
static void apply_relative_time(parser_control *pc, relative_time rel, int factor)
{
    pc->rel.ns += factor * rel.ns;
    pc->rel.seconds += factor * rel.seconds;
    pc->rel.minutes += factor * rel.minutes;
    pc->rel.hour += factor * rel.hour;
    pc->rel.day += factor * rel.day;
    pc->rel.month += factor * rel.month;
    pc->rel.year += factor * rel.year;
    pc->rels_seen = true;
}

/* Set PC-> hour, minutes, seconds and nanoseconds members from arguments.  */
static void set_hhmmss(parser_control *pc, long int hour, long int minutes, time_t sec, long int nsec)
{
    pc->hour = hour;
    pc->minutes = minutes;
    pc->seconds.tv_sec = sec;
    pc->seconds.tv_nsec = nsec;
}

#line 369 "common/parse-datetime.c"

#ifndef YY_CAST
#ifdef __cplusplus
#define YY_CAST(Type, Val) static_cast<Type>(Val)
#define YY_REINTERPRET_CAST(Type, Val) reinterpret_cast<Type>(Val)
#else
#define YY_CAST(Type, Val) ((Type)(Val))
#define YY_REINTERPRET_CAST(Type, Val) ((Type)(Val))
#endif
#endif
#ifndef YY_NULLPTR
#if defined __cplusplus
#if 201103L <= __cplusplus
#define YY_NULLPTR nullptr
#else
#define YY_NULLPTR 0
#endif
#else
#define YY_NULLPTR ((void *)0)
#endif
#endif

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

/* Debug traces.  */
#ifndef YYDEBUG
#define YYDEBUG 0
#endif
#if YYDEBUG
extern int yydebug;
#endif

/* Token type.  */
#ifndef YYTOKENTYPE
#define YYTOKENTYPE
enum yytokentype
{
    tAGO = 258,
    tDST = 259,
    tYEAR_UNIT = 260,
    tMONTH_UNIT = 261,
    tHOUR_UNIT = 262,
    tMINUTE_UNIT = 263,
    tSEC_UNIT = 264,
    tDAY_UNIT = 265,
    tDAY_SHIFT = 266,
    tDAY = 267,
    tDAYZONE = 268,
    tLOCAL_ZONE = 269,
    tMERIDIAN = 270,
    tMONTH = 271,
    tORDINAL = 272,
    tZONE = 273,
    tSNUMBER = 274,
    tUNUMBER = 275,
    tSDECIMAL_NUMBER = 276,
    tUDECIMAL_NUMBER = 277
};
#endif

/* Value type.  */
#if !defined YYSTYPE && !defined YYSTYPE_IS_DECLARED
union YYSTYPE
{
#line 310 "common/parse-datetime.y"

    long int intval;
    textint textintval;
    struct timespec timespec;
    relative_time rel;

#line 448 "common/parse-datetime.c"
};
typedef union YYSTYPE YYSTYPE;
#define YYSTYPE_IS_TRIVIAL 1
#define YYSTYPE_IS_DECLARED 1
#endif

int yyparse(parser_control *pc);

#ifdef short
#undef short
#endif

/* On compilers that do not define __PTRDIFF_MAX__ etc., make sure
   <limits.h> and (if available) <stdint.h> are included
   so that the code can choose integer types of a good width.  */

#ifndef __PTRDIFF_MAX__
#include <limits.h> /* INFRINGES ON USER NAME SPACE */
#if defined __STDC_VERSION__ && 199901 <= __STDC_VERSION__
#include <stdint.h> /* INFRINGES ON USER NAME SPACE */
#define YY_STDINT_H
#endif
#endif

/* Narrow types that promote to a signed type and that can represent a
   signed or unsigned integer of at least N bits.  In tables they can
   save space and decrease cache pressure.  Promoting to a signed type
   helps avoid bugs in integer arithmetic.  */

#ifdef __INT_LEAST8_MAX__
typedef __INT_LEAST8_TYPE__ yytype_int8;
#elif defined YY_STDINT_H
typedef int_least8_t yytype_int8;
#else
typedef signed char yytype_int8;
#endif

#ifdef __INT_LEAST16_MAX__
typedef __INT_LEAST16_TYPE__ yytype_int16;
#elif defined YY_STDINT_H
typedef int_least16_t yytype_int16;
#else
typedef short yytype_int16;
#endif

#if defined __UINT_LEAST8_MAX__ && __UINT_LEAST8_MAX__ <= __INT_MAX__
typedef __UINT_LEAST8_TYPE__ yytype_uint8;
#elif (!defined __UINT_LEAST8_MAX__ && defined YY_STDINT_H && UINT_LEAST8_MAX <= INT_MAX)
typedef uint_least8_t yytype_uint8;
#elif !defined __UINT_LEAST8_MAX__ && UCHAR_MAX <= INT_MAX
typedef unsigned char yytype_uint8;
#else
typedef short yytype_uint8;
#endif

#if defined __UINT_LEAST16_MAX__ && __UINT_LEAST16_MAX__ <= __INT_MAX__
typedef __UINT_LEAST16_TYPE__ yytype_uint16;
#elif (!defined __UINT_LEAST16_MAX__ && defined YY_STDINT_H && UINT_LEAST16_MAX <= INT_MAX)
typedef uint_least16_t yytype_uint16;
#elif !defined __UINT_LEAST16_MAX__ && USHRT_MAX <= INT_MAX
typedef unsigned short yytype_uint16;
#else
typedef int yytype_uint16;
#endif

#ifndef YYPTRDIFF_T
#if defined __PTRDIFF_TYPE__ && defined __PTRDIFF_MAX__
#define YYPTRDIFF_T __PTRDIFF_TYPE__
#define YYPTRDIFF_MAXIMUM __PTRDIFF_MAX__
#elif defined PTRDIFF_MAX
#ifndef ptrdiff_t
#include <stddef.h> /* INFRINGES ON USER NAME SPACE */
#endif
#define YYPTRDIFF_T ptrdiff_t
#define YYPTRDIFF_MAXIMUM PTRDIFF_MAX
#else
#define YYPTRDIFF_T long
#define YYPTRDIFF_MAXIMUM LONG_MAX
#endif
#endif

#ifndef YYSIZE_T
#ifdef __SIZE_TYPE__
#define YYSIZE_T __SIZE_TYPE__
#elif defined size_t
#define YYSIZE_T size_t
#elif defined __STDC_VERSION__ && 199901 <= __STDC_VERSION__
#include <stddef.h> /* INFRINGES ON USER NAME SPACE */
#define YYSIZE_T size_t
#else
#define YYSIZE_T unsigned
#endif
#endif

#define YYSIZE_MAXIMUM YY_CAST(YYPTRDIFF_T, (YYPTRDIFF_MAXIMUM < YY_CAST(YYSIZE_T, -1) ? YYPTRDIFF_MAXIMUM : YY_CAST(YYSIZE_T, -1)))

#define YYSIZEOF(X) YY_CAST(YYPTRDIFF_T, sizeof(X))

/* Stored state numbers (used for stacks). */
typedef yytype_int8 yy_state_t;

/* State numbers in computations.  */
typedef int yy_state_fast_t;

#ifndef YY_
#if defined YYENABLE_NLS && YYENABLE_NLS
#if ENABLE_NLS
#include <libintl.h> /* INFRINGES ON USER NAME SPACE */
#define YY_(Msgid) dgettext("bison-runtime", Msgid)
#endif
#endif
#ifndef YY_
#define YY_(Msgid) Msgid
#endif
#endif

#ifndef YY_ATTRIBUTE_PURE
#if defined __GNUC__ && 2 < __GNUC__ + (96 <= __GNUC_MINOR__)
#define YY_ATTRIBUTE_PURE __attribute__((__pure__))
#else
#define YY_ATTRIBUTE_PURE
#endif
#endif

#ifndef YY_ATTRIBUTE_UNUSED
#if defined __GNUC__ && 2 < __GNUC__ + (7 <= __GNUC_MINOR__)
#define YY_ATTRIBUTE_UNUSED __attribute__((__unused__))
#else
#define YY_ATTRIBUTE_UNUSED
#endif
#endif

/* Suppress unused-variable warnings by "using" E.  */
#if !defined lint || defined __GNUC__
#define YYUSE(E) ((void)(E))
#else
#define YYUSE(E) /* empty */
#endif

#if defined __GNUC__ && !defined __ICC && 407 <= __GNUC__ * 100 + __GNUC_MINOR__
/* Suppress an incorrect diagnostic about yylval being uninitialized.  */
#define YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN _Pragma("GCC diagnostic push") _Pragma("GCC diagnostic ignored \"-Wuninitialized\"") _Pragma("GCC diagnostic ignored \"-Wmaybe-uninitialized\"")
#define YY_IGNORE_MAYBE_UNINITIALIZED_END _Pragma("GCC diagnostic pop")
#else
#define YY_INITIAL_VALUE(Value) Value
#endif
#ifndef YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
#define YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
#define YY_IGNORE_MAYBE_UNINITIALIZED_END
#endif
#ifndef YY_INITIAL_VALUE
#define YY_INITIAL_VALUE(Value) /* Nothing. */
#endif

#if defined __cplusplus && defined __GNUC__ && !defined __ICC && 6 <= __GNUC__
#define YY_IGNORE_USELESS_CAST_BEGIN _Pragma("GCC diagnostic push") _Pragma("GCC diagnostic ignored \"-Wuseless-cast\"")
#define YY_IGNORE_USELESS_CAST_END _Pragma("GCC diagnostic pop")
#endif
#ifndef YY_IGNORE_USELESS_CAST_BEGIN
#define YY_IGNORE_USELESS_CAST_BEGIN
#define YY_IGNORE_USELESS_CAST_END
#endif

#define YY_ASSERT(E) ((void)(0 && (E)))

#if !defined yyoverflow || YYERROR_VERBOSE

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

#ifdef YYSTACK_USE_ALLOCA
#if YYSTACK_USE_ALLOCA
#ifdef __GNUC__
#define YYSTACK_ALLOC __builtin_alloca
#elif defined __BUILTIN_VA_ARG_INCR
#include <alloca.h> /* INFRINGES ON USER NAME SPACE */
#elif defined _AIX
#define YYSTACK_ALLOC __alloca
#elif defined _MSC_VER
#include <malloc.h> /* INFRINGES ON USER NAME SPACE */
#define alloca _alloca
#else
#define YYSTACK_ALLOC alloca
#if !defined _ALLOCA_H && !defined EXIT_SUCCESS
#include <stdlib.h> /* INFRINGES ON USER NAME SPACE */
/* Use EXIT_SUCCESS as a witness for stdlib.h.  */
#ifndef EXIT_SUCCESS
#define EXIT_SUCCESS 0
#endif
#endif
#endif
#endif
#endif

#ifdef YYSTACK_ALLOC
/* Pacify GCC's 'empty if-body' warning.  */
#define YYSTACK_FREE(Ptr)                                                                                                                                                                              \
    do                                                                                                                                                                                                 \
    { /* empty */                                                                                                                                                                                      \
        ;                                                                                                                                                                                              \
    } while (0)
#ifndef YYSTACK_ALLOC_MAXIMUM
/* The OS might guarantee only one guard page at the bottom of the stack,
       and a page size can be as small as 4096 bytes.  So we cannot safely
       invoke alloca (N) if N exceeds 4096.  Use a slightly smaller number
       to allow for a few compiler-allocated temporary stack slots.  */
#define YYSTACK_ALLOC_MAXIMUM 4032 /* reasonable circa 2006 */
#endif
#else
#define YYSTACK_ALLOC YYMALLOC
#define YYSTACK_FREE YYFREE
#ifndef YYSTACK_ALLOC_MAXIMUM
#define YYSTACK_ALLOC_MAXIMUM YYSIZE_MAXIMUM
#endif
#if (defined __cplusplus && !defined EXIT_SUCCESS && !((defined YYMALLOC || defined malloc) && (defined YYFREE || defined free)))
#include <stdlib.h> /* INFRINGES ON USER NAME SPACE */
#ifndef EXIT_SUCCESS
#define EXIT_SUCCESS 0
#endif
#endif
#ifndef YYMALLOC
#define YYMALLOC malloc
#if !defined malloc && !defined EXIT_SUCCESS
void *malloc(YYSIZE_T); /* INFRINGES ON USER NAME SPACE */
#endif
#endif
#ifndef YYFREE
#define YYFREE free
#if !defined free && !defined EXIT_SUCCESS
void free(void *); /* INFRINGES ON USER NAME SPACE */
#endif
#endif
#endif
#endif /* ! defined yyoverflow || YYERROR_VERBOSE */

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

/* A type that is properly aligned for any stack member.  */
union yyalloc
{
    yy_state_t yyss_alloc;
    YYSTYPE yyvs_alloc;
};

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

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

#define YYCOPY_NEEDED 1

/* 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_alloc, Stack)                                                                                                                                                           \
    do                                                                                                                                                                                                 \
    {                                                                                                                                                                                                  \
        YYPTRDIFF_T yynewbytes;                                                                                                                                                                        \
        YYCOPY(&yyptr->Stack_alloc, Stack, yysize);                                                                                                                                                    \
        Stack = &yyptr->Stack_alloc;                                                                                                                                                                   \
        yynewbytes = yystacksize * YYSIZEOF(*Stack) + YYSTACK_GAP_MAXIMUM;                                                                                                                             \
        yyptr += yynewbytes / YYSIZEOF(*yyptr);                                                                                                                                                        \
    } while (0)

#endif

#if defined YYCOPY_NEEDED && YYCOPY_NEEDED
/* Copy COUNT objects from SRC to DST.  The source and destination do
   not overlap.  */
#ifndef YYCOPY
#if defined __GNUC__ && 1 < __GNUC__
#define YYCOPY(Dst, Src, Count) __builtin_memcpy(Dst, Src, YY_CAST(YYSIZE_T, (Count)) * sizeof(*(Src)))
#else
#define YYCOPY(Dst, Src, Count)                                                                                                                                                                        \
    do                                                                                                                                                                                                 \
    {                                                                                                                                                                                                  \
        YYPTRDIFF_T yyi;                                                                                                                                                                               \
        for (yyi = 0; yyi < (Count); yyi++)                                                                                                                                                            \
        {
(Dst)[yyi] = (Src)[yyi];
}
}
while (0)
#endif
#endif
#endif /* !YYCOPY_NEEDED */

/* YYFINAL -- State number of the termination state.  */
#define YYFINAL 12
/* YYLAST -- Last index in YYTABLE.  */
#define YYLAST 112

/* YYNTOKENS -- Number of terminals.  */
#define YYNTOKENS 28
/* YYNNTS -- Number of nonterminals.  */
#define YYNNTS 26
/* YYNRULES -- Number of rules.  */
#define YYNRULES 91
/* YYNSTATES -- Number of states.  */
#define YYNSTATES 114

#define YYUNDEFTOK 2
#define YYMAXUTOK 277

/* YYTRANSLATE(TOKEN-NUM) -- Symbol number corresponding to TOKEN-NUM
   as returned by yylex, with out-of-bounds checking.  */
#define YYTRANSLATE(YYX) (0 <= (YYX) && (YYX) <= YYMAXUTOK ? yytranslate[YYX] : YYUNDEFTOK)

/* YYTRANSLATE[TOKEN-NUM] -- Symbol number corresponding to TOKEN-NUM
   as returned by yylex.  */
static const yytype_int8 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, 26, 2, 2,
                                           27, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 25, 2, 2, 2, 2, 2, 23, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,  2,  2,  2,  2,  2,  2,  24, 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, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 };

#if YYDEBUG
/* YYRLINE[YYN] -- Source line where rule number YYN was defined.  */
static const yytype_int16 yyrline[] = { 0,   337, 337, 338, 342, 349, 351, 355, 357, 359, 361, 363, 365, 367, 368, 369, 373, 377, 381, 386, 391, 396, 400, 405, 410, 417, 419, 423, 431, 436, 446,
                                        448, 450, 453, 456, 458, 460, 465, 470, 475, 480, 488, 493, 513, 521, 529, 534, 540, 545, 551, 555, 565, 567, 569, 574, 576, 578, 580, 582, 584, 586, 588,
                                        590, 592, 594, 596, 598, 600, 602, 604, 606, 608, 610, 612, 614, 618, 620, 622, 624, 626, 628, 633, 637, 637, 640, 641, 646, 647, 652, 657, 668, 669 };
#endif

#if YYDEBUG || YYERROR_VERBOSE || 0
/* YYTNAME[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",
                                       "tAGO",
                                       "tDST",
                                       "tYEAR_UNIT",
                                       "tMONTH_UNIT",
                                       "tHOUR_UNIT",
                                       "tMINUTE_UNIT",
                                       "tSEC_UNIT",
                                       "tDAY_UNIT",
                                       "tDAY_SHIFT",
                                       "tDAY",
                                       "tDAYZONE",
                                       "tLOCAL_ZONE",
                                       "tMERIDIAN",
                                       "tMONTH",
                                       "tORDINAL",
                                       "tZONE",
                                       "tSNUMBER",
                                       "tUNUMBER",
                                       "tSDECIMAL_NUMBER",
                                       "tUDECIMAL_NUMBER",
                                       "'@'",
                                       "'T'",
                                       "':'",
                                       "','",
                                       "'/'",
                                       "$accept",
                                       "spec",
                                       "timespec",
                                       "items",
                                       "item",
                                       "datetime",
                                       "iso_8601_datetime",
                                       "time",
                                       "iso_8601_time",
                                       "o_zone_offset",
                                       "zone_offset",
                                       "local_zone",
                                       "zone",
                                       "day",
                                       "date",
                                       "iso_8601_date",
                                       "rel",
                                       "relunit",
                                       "relunit_snumber",
                                       "dayshift",
                                       "seconds",
                                       "signed_seconds",
                                       "unsigned_seconds",
                                       "number",
                                       "hybrid",
                                       "o_colon_minutes",
                                       YY_NULLPTR };
#endif

#ifdef YYPRINT
/* YYTOKNUM[NUM] -- (External) token number corresponding to the
   (internal) symbol number NUM (which must be that of a token).  */
static const yytype_int16 yytoknum[] = { 0, 256, 257, 258, 259, 260, 261, 262, 263, 264, 265, 266, 267, 268, 269, 270, 271, 272, 273, 274, 275, 276, 277, 64, 84, 58, 44, 47 };
#endif

#define YYPACT_NINF (-93)

#define yypact_value_is_default(Yyn) ((Yyn) == YYPACT_NINF)

#define YYTABLE_NINF (-1)

#define yytable_value_is_error(Yyn) 0

/* YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing
     STATE-NUM.  */
static const yytype_int8 yypact[] = { 38,  27, 77,  -93, 46,  -93, -93, -93, -93, -93, -93, -93, -93, -93, -93, -93, -93, -93, -93, -93, 62, -93, 82,  -3,  66,  3,   74,  -4,  83,
                                      84,  75, -93, -93, -93, -93, -93, -93, -93, -93, -93, 71,  -93, 93,  -93, -93, -93, -93, -93, -93, 78, 72,  -93, -93, -93, -93, -93, -93, -93,
                                      -93, 25, -93, -93, -93, -93, -93, -93, -93, -93, -93, -93, -93, -93, -93, -93, -93, 21,  19,  79,  80, -93, -93, -93, -93, -93, 81,  -93, -93,
                                      85,  86, -93, -93, -93, -93, -93, -6,  76,  17,  -93, -93, -93, -93, 87,  69,  -93, -93, 88,  89,  -1, -93, 18,  -93, -93, 69,  91 };

/* YYDEFACT[STATE-NUM] -- Default reduction number in state STATE-NUM.
     Performed when YYTABLE does not specify something else to do.  Zero
     means the default is an error.  */
static const yytype_int8 yydefact[] = { 5,  0,  0,  2,  3,  85, 87, 84, 86, 4,  82, 83, 1,  56, 59, 65, 68, 73, 62, 81, 37, 35, 28, 0,  0,  30, 0,  88, 0,  0,  31, 6,  7,  16, 8,  21, 9,  10,
                                        12, 11, 49, 13, 52, 74, 53, 14, 15, 38, 29, 0,  45, 54, 57, 63, 66, 69, 60, 39, 36, 90, 32, 75, 76, 78, 79, 80, 77, 55, 58, 64, 67, 70, 61, 40, 18, 47,
                                        90, 0,  0,  22, 89, 71, 72, 33, 0,  51, 44, 0,  0,  34, 43, 48, 50, 27, 25, 41, 0,  17, 46, 91, 19, 90, 0,  23, 26, 0,  0,  25, 42, 25, 20, 24, 0,  25 };

/* YYPGOTO[NTERM-NUM].  */
static const yytype_int8 yypgoto[] = { -93, -93, -93, -93, -93, -93, -93, -93, 20, -68, -27, -93, -93, -93, -93, -93, -93, -93, 60, -93, -93, -93, -92, -93, -93, 43 };

/* YYDEFGOTO[NTERM-NUM].  */
static const yytype_int8 yydefgoto[] = { -1, 2, 3, 4, 31, 32, 33, 34, 35, 103, 104, 36, 37, 38, 39, 40, 41, 42, 43, 44, 9, 10, 11, 45, 46, 93 };

/* YYTABLE[YYPACT[STATE-NUM]] -- What to do in state STATE-NUM.  If
     positive, shift that token.  If negative, reduce the rule whose
     number is the opposite.  If YYTABLE_NINF, syntax error.  */
static const yytype_int8 yytable[] = { 79, 67, 68, 69, 70, 71, 72, 58,  73,  100, 107, 74, 75, 101, 110, 76, 49,  50, 101, 102, 113, 77,  59,  78,  61, 62, 63, 64, 65,
                                       66, 61, 62, 63, 64, 65, 66, 101, 101, 92,  111, 90, 91, 106, 112, 88, 111, 5,  6,   7,   8,   88,  13,  14,  15, 16, 17, 18, 19,
                                       20, 21, 22, 1,  23, 24, 25, 26,  27,  28,  29,  79, 30, 51,  52,  53, 54,  55, 56,  12,  57,  61,  62,  63,  64, 65, 66, 60, 48,
                                       80, 47, 6,  83, 8,  81, 82, 26,  84,  85,  86,  87, 94, 95,  96,  89, 105, 97, 98,  99,  0,   108, 109, 101, 0,  88 };

static const yytype_int8 yycheck[] = { 27, 5,   6,  7,  8,  9,  10, 4,   12, 15, 102, 15, 16, 19, 15, 19, 19, 20, 19, 25, 112, 25, 19, 27, 5,  6,  7,  8,  9,  10, 5,  6,  7,  8,  9,  10, 19, 19,
                                       19, 107, 19, 20, 25, 25, 25, 113, 19, 20, 21,  22, 25, 5,  6,  7,  8,  9,  10, 11, 12,  13, 14, 23, 16, 17, 18, 19, 20, 21, 22, 96, 24, 5,  6,  7,  8,  9,
                                       10, 0,   12, 5,  6,  7,  8,  9,   10, 25, 4,   27, 26, 20, 30, 22, 9,  9,  19, 24, 3,   19, 26, 20, 20, 20, 59, 27, 84, 20, 20, -1, 20, 20, 19, -1, 25 };

/* YYSTOS[STATE-NUM] -- The (internal number of the) accessing
     symbol of state STATE-NUM.  */
static const yytype_int8 yystos[] = { 0,  23, 29, 30, 31, 19, 20, 21, 22, 48, 49, 50, 0,  5,  6,  7,  8,  9,  10, 11, 12, 13, 14, 16, 17, 18, 19, 20, 21, 22, 24, 32, 33, 34, 35, 36, 39, 40,
                                      41, 42, 43, 44, 45, 46, 47, 51, 52, 26, 4,  19, 20, 5,  6,  7,  8,  9,  10, 12, 4,  19, 46, 5,  6,  7,  8,  9,  10, 5,  6,  7,  8,  9,  10, 12, 15, 16,
                                      19, 25, 27, 38, 46, 9,  9,  46, 24, 3,  19, 26, 25, 53, 19, 20, 19, 53, 20, 20, 20, 36, 20, 20, 15, 19, 25, 37, 38, 27, 25, 50, 20, 20, 15, 37, 25, 50 };

/* YYR1[YYN] -- Symbol number of symbol that rule YYN derives.  */
static const yytype_int8 yyr1[] = { 0,  28, 29, 29, 30, 31, 31, 32, 32, 32, 32, 32, 32, 32, 32, 32, 33, 34, 35, 35, 35, 35, 36, 36, 36, 37, 37, 38, 39, 39, 40,
                                    40, 40, 40, 40, 40, 40, 41, 41, 41, 41, 42, 42, 42, 42, 42, 42, 42, 42, 42, 43, 44, 44, 44, 45, 45, 45, 45, 45, 45, 45, 45,
                                    45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 46, 46, 46, 46, 46, 46, 47, 48, 48, 49, 49, 50, 50, 51, 52, 53, 53 };

/* YYR2[YYN] -- Number of symbols on the right hand side of rule YYN.  */
static const yytype_int8 yyr2[] = { 0, 2, 1, 1, 2, 0, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 2, 4, 6, 1, 2, 4, 6, 0, 1, 2, 1, 2, 1, 1, 2, 2, 3, 1, 2, 1, 2, 2, 2, 3, 5, 3, 3, 2,
                                    4, 2, 3, 1, 3, 2, 1, 1, 2, 2, 1, 2, 2, 1, 2, 2, 1, 2, 2, 1, 2, 2, 1, 2, 2, 2, 2, 1, 1, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 2, 0, 2 };

#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 yyerrorlab

#define YYRECOVERING() (!!yyerrstatus)

#define YYBACKUP(Token, Value)                                                                                                                                                                         \
    do                                                                                                                                                                                                 \
        if (yychar == YYEMPTY)                                                                                                                                                                         \
        {                                                                                                                                                                                              \
            yychar = (Token);                                                                                                                                                                          \
            yylval = (Value);                                                                                                                                                                          \
            YYPOPSTACK(yylen);                                                                                                                                                                         \
            yystate = *yyssp;                                                                                                                                                                          \
            goto yybackup;                                                                                                                                                                             \
        }                                                                                                                                                                                              \
        else                                                                                                                                                                                           \
        {                                                                                                                                                                                              \
            yyerror(pc, YY_("syntax error: cannot back up"));                                                                                                                                          \
            YYERROR;                                                                                                                                                                                   \
        }                                                                                                                                                                                              \
    while (0)

/* Error token number */
#define YYTERROR 1
#define YYERRCODE 256

/* 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)

/* This macro is provided for backward compatibility. */
#ifndef YY_LOCATION_PRINT
#define YY_LOCATION_PRINT(File, Loc) ((void)0)
#endif

#define YY_SYMBOL_PRINT(Title, Type, Value, Location)                                                                                                                                                  \
    do                                                                                                                                                                                                 \
    {                                                                                                                                                                                                  \
        if (yydebug)                                                                                                                                                                                   \
        {                                                                                                                                                                                              \
            YYFPRINTF(stderr, "%s ", Title);                                                                                                                                                           \
            yy_symbol_print(stderr, Type, Value, pc);                                                                                                                                                  \
            YYFPRINTF(stderr, "\n");                                                                                                                                                                   \
        }                                                                                                                                                                                              \
    } while (0)

    /*-----------------------------------.
| Print this symbol's value on YYO.  |
`-----------------------------------*/

    static void yy_symbol_value_print(FILE *yyo, int yytype, YYSTYPE const *const yyvaluep, parser_control *pc)
    {
        FILE *yyoutput = yyo;
        YYUSE(yyoutput);
        YYUSE(pc);
        if (!yyvaluep)
        {
            return;
        }
#ifdef YYPRINT
        if (yytype < YYNTOKENS)
        {
            YYPRINT(yyo, yytoknum[yytype], *yyvaluep);
        }
#endif
        YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
        YYUSE(yytype);
        YY_IGNORE_MAYBE_UNINITIALIZED_END
    }

/*---------------------------.
| Print this symbol on YYO.  |
`---------------------------*/

static void yy_symbol_print(FILE *yyo, int yytype, YYSTYPE const *const yyvaluep, parser_control *pc)
{
    YYFPRINTF(yyo, "%s %s (", yytype < YYNTOKENS ? "token" : "nterm", yytname[yytype]);

    yy_symbol_value_print(yyo, yytype, yyvaluep, pc);
    YYFPRINTF(yyo, ")");
}

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

static void yy_stack_print(yy_state_t *yybottom, yy_state_t *yytop)
{
    YYFPRINTF(stderr, "Stack now");
    for (; yybottom <= yytop; yybottom++)
    {
        int yybot = *yybottom;
        YYFPRINTF(stderr, " %d", yybot);
    }
    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.  |
`------------------------------------------------*/

    static void yy_reduce_print(yy_state_t *yyssp, YYSTYPE *yyvsp, int yyrule, parser_control *pc)
    {
        int yylno = yyrline[yyrule];
        int yynrhs = yyr2[yyrule];
        int yyi;
        YYFPRINTF(stderr, "Reducing stack by rule %d (line %d):\n", yyrule - 1, yylno);
        /* The symbols being reduced.  */
        for (yyi = 0; yyi < yynrhs; yyi++)
        {
            YYFPRINTF(stderr, "   $%d = ", yyi + 1);
            yy_symbol_print(stderr, yystos[+yyssp[yyi + 1 - yynrhs]], &yyvsp[(yyi + 1) - (yynrhs)], pc);
            YYFPRINTF(stderr, "\n");
        }
    }

#define YY_REDUCE_PRINT(Rule)                                                                                                                                                                          \
    do                                                                                                                                                                                                 \
    {                                                                                                                                                                                                  \
        if (yydebug)                                                                                                                                                                                   \
        {
yy_reduce_print(yyssp, yyvsp, Rule, pc);
}
}
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 YY_SYMBOL_PRINT(Title, Type, 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
   YYSTACK_ALLOC_MAXIMUM < YYSTACK_BYTES (YYMAXDEPTH)
   evaluated with infinite-precision integer arithmetic.  */

#ifndef YYMAXDEPTH
#define YYMAXDEPTH 10000
#endif

#if YYERROR_VERBOSE

#ifndef yystrlen
#if defined __GLIBC__ && defined _STRING_H
#define yystrlen(S) (YY_CAST(YYPTRDIFF_T, strlen(S)))
#else
/* Return the length of YYSTR.  */
static YYPTRDIFF_T yystrlen(const char *yystr)
{
    YYPTRDIFF_T yylen;
    for (yylen = 0; yystr[yylen]; yylen++)
    {
        continue;
    }
    return yylen;
}
#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 *yystpcpy(char *yydest, const char *yysrc)
{
    char *yyd = yydest;
    const char *yys = yysrc;

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

    return yyd - 1;
}
#endif
#endif

#ifndef yytnamerr
/* Copy to YYRES the contents of YYSTR after stripping away unnecessary
   quotes and backslashes, so that it's suitable for yyerror.  The
   heuristic is that double-quoting is unnecessary unless the string
   contains an apostrophe, a comma, or backslash (other than
   backslash-backslash).  YYSTR is taken from yytname.  If YYRES is
   null, do not copy; instead, return the length of what the result
   would have been.  */
static YYPTRDIFF_T yytnamerr(char *yyres, const char *yystr)
{
    if (*yystr == '"')
    {
        YYPTRDIFF_T yyn = 0;
        char const *yyp = yystr;

        for (;;)
        {
            switch (*++yyp)
            {
            case '\'':
            case ',':
                goto do_not_strip_quotes;

            case '\\':
                if (*++yyp != '\\')
                {
                    goto do_not_strip_quotes;
                }
                else
                {
                    goto append;
                }

            append:
            default:
                if (yyres)
                {
                    yyres[yyn] = *yyp;
                }
                yyn++;
                break;

            case '"':
                if (yyres)
                {
                    yyres[yyn] = '\0';
                }
                return yyn;
            }
        }
    do_not_strip_quotes:;
    }

    if (yyres)
    {
        return yystpcpy(yyres, yystr) - yyres;
    }
    else
    {
        return yystrlen(yystr);
    }
}
#endif

/* Copy into *YYMSG, which is of size *YYMSG_ALLOC, an error message
   about the unexpected token YYTOKEN for the state stack whose top is
   YYSSP.

   Return 0 if *YYMSG was successfully written.  Return 1 if *YYMSG is
   not large enough to hold the message.  In that case, also set
   *YYMSG_ALLOC to the required number of bytes.  Return 2 if the
   required number of bytes is too large to store.  */
static int yysyntax_error(YYPTRDIFF_T *yymsg_alloc, char **yymsg, yy_state_t *yyssp, int yytoken)
{
    enum
    {
        YYERROR_VERBOSE_ARGS_MAXIMUM = 5
    };
    /* Internationalized format string. */
    const char *yyformat = YY_NULLPTR;
    /* Arguments of yyformat: reported tokens (one for the "unexpected",
     one per "expected"). */
    char const *yyarg[YYERROR_VERBOSE_ARGS_MAXIMUM];
    /* Actual size of YYARG. */
    int yycount = 0;
    /* Cumulated lengths of YYARG.  */
    YYPTRDIFF_T yysize = 0;

    /* There are many possibilities here to consider:
     - If this state is a consistent state with a default action, then
       the only way this function was invoked is if the default action
       is an error action.  In that case, don't check for expected
       tokens because there are none.
     - The only way there can be no lookahead present (in yychar) is if
       this state is a consistent state with a default action.  Thus,
       detecting the absence of a lookahead is sufficient to determine
       that there is no unexpected or expected token to report.  In that
       case, just report a simple "syntax error".
     - Don't assume there isn't a lookahead just because this state is a
       consistent state with a default action.  There might have been a
       previous inconsistent state, consistent state with a non-default
       action, or user semantic action that manipulated yychar.
     - Of course, the expected token list depends on states to have
       correct lookahead information, and it depends on the parser not
       to perform extra reductions after fetching a lookahead from the
       scanner and before detecting a syntax error.  Thus, state merging
       (from LALR or IELR) and default reductions corrupt the expected
       token list.  However, the list is correct for canonical LR with
       one exception: it will still contain any token that will not be
       accepted due to an error action in a later state.
  */
    if (yytoken != YYEMPTY)
    {
        int yyn = yypact[+*yyssp];
        YYPTRDIFF_T yysize0 = yytnamerr(YY_NULLPTR, yytname[yytoken]);
        yysize = yysize0;
        yyarg[yycount++] = yytname[yytoken];
        if (!yypact_value_is_default(yyn))
        {
            /* Start YYX at -YYN if negative to avoid negative indexes in
             YYCHECK.  In other words, skip the first -YYN actions for
             this state because they are default actions.  */
            int yyxbegin = yyn < 0 ? -yyn : 0;
            /* Stay within bounds of both yycheck and yytname.  */
            int yychecklim = YYLAST - yyn + 1;
            int yyxend = yychecklim < YYNTOKENS ? yychecklim : YYNTOKENS;
            int yyx;

            for (yyx = yyxbegin; yyx < yyxend; ++yyx)
            {
                if (yycheck[yyx + yyn] == yyx && yyx != YYTERROR && !yytable_value_is_error(yytable[yyx + yyn]))
                {
                    if (yycount == YYERROR_VERBOSE_ARGS_MAXIMUM)
                    {
                        yycount = 1;
                        yysize = yysize0;
                        break;
                    }
                    yyarg[yycount++] = yytname[yyx];
                    {
                        YYPTRDIFF_T yysize1 = yysize + yytnamerr(YY_NULLPTR, yytname[yyx]);
                        if (yysize <= yysize1 && yysize1 <= YYSTACK_ALLOC_MAXIMUM)
                        {
                            yysize = yysize1;
                        }
                        else
                        {
                            return 2;
                        }
                    }
                }
            }
        }
    }

    switch (yycount)
    {
#define YYCASE_(N, S)                                                                                                                                                                                  \
    case N:                                                                                                                                                                                            \
        yyformat = S;                                                                                                                                                                                  \
        break
    default: /* Avoid compiler warnings. */
        YYCASE_(0, YY_("syntax error"));
        YYCASE_(1, YY_("syntax error, unexpected %s"));
        YYCASE_(2, YY_("syntax error, unexpected %s, expecting %s"));
        YYCASE_(3, YY_("syntax error, unexpected %s, expecting %s or %s"));
        YYCASE_(4, YY_("syntax error, unexpected %s, expecting %s or %s or %s"));
        YYCASE_(5, YY_("syntax error, unexpected %s, expecting %s or %s or %s or %s"));
#undef YYCASE_
    }

    {
        /* Don't count the "%s"s in the final size, but reserve room for
       the terminator.  */
        YYPTRDIFF_T yysize1 = yysize + (yystrlen(yyformat) - 2 * yycount) + 1;
        if (yysize <= yysize1 && yysize1 <= YYSTACK_ALLOC_MAXIMUM)
        {
            yysize = yysize1;
        }
        else
        {
            return 2;
        }
    }

    if (*yymsg_alloc < yysize)
    {
        *yymsg_alloc = 2 * yysize;
        if (!(yysize <= *yymsg_alloc && *yymsg_alloc <= YYSTACK_ALLOC_MAXIMUM))
        {
            *yymsg_alloc = YYSTACK_ALLOC_MAXIMUM;
        }
        return 1;
    }

    /* Avoid sprintf, as that infringes on the user's name space.
     Don't have undefined behavior even if the translation
     produced a string with the wrong number of "%s"s.  */
    {
        char *yyp = *yymsg;
        int yyi = 0;
        while ((*yyp = *yyformat) != '\0')
        {
            if (*yyp == '%' && yyformat[1] == 's' && yyi < yycount)
            {
                yyp += yytnamerr(yyp, yyarg[yyi++]);
                yyformat += 2;
            }
            else
            {
                ++yyp;
                ++yyformat;
            }
        }
    }
    return 0;
}
#endif /* YYERROR_VERBOSE */

/*-----------------------------------------------.
| Release the memory associated to this symbol.  |
`-----------------------------------------------*/

static void yydestruct(const char *yymsg, int yytype, YYSTYPE *yyvaluep, parser_control *pc)
{
    YYUSE(yyvaluep);
    YYUSE(pc);
    if (!yymsg)
    {
        yymsg = "Deleting";
    }
    YY_SYMBOL_PRINT(yymsg, yytype, yyvaluep, yylocationp);

    YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
    YYUSE(yytype);
    YY_IGNORE_MAYBE_UNINITIALIZED_END
}

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

int yyparse(parser_control *pc)
{
    /* The lookahead symbol.  */
    int yychar;

    /* The semantic value of the lookahead symbol.  */
    /* Default value used for initialization, for pacifying older GCCs
   or non-GCC compilers.  */
    YY_INITIAL_VALUE(static YYSTYPE yyval_default;)
    YYSTYPE yylval YY_INITIAL_VALUE(= yyval_default);

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

    yy_state_fast_t yystate;
    /* Number of tokens to shift before error messages enabled.  */
    int yyerrstatus;

    /* The stacks and their tools:
       'yyss': related to states.
       'yyvs': related to semantic values.

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

    /* The state stack.  */
    yy_state_t yyssa[YYINITDEPTH];
    yy_state_t *yyss;
    yy_state_t *yyssp;

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

    YYPTRDIFF_T yystacksize;

    int yyn;
    int yyresult;
    /* Lookahead token as an internal (translated) token number.  */
    int yytoken = 0;
    /* The variables used to return semantic value and location from the
     action routines.  */
    YYSTYPE yyval;

#if YYERROR_VERBOSE
    /* Buffer for error messages, and its allocated size.  */
    char yymsgbuf[128];
    char *yymsg = yymsgbuf;
    YYPTRDIFF_T yymsg_alloc = sizeof yymsgbuf;
#endif

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

    /* The number of symbols on the RHS of the reduced rule.
     Keep to zero when no symbol should be popped.  */
    int yylen = 0;

    yyssp = yyss = yyssa;
    yyvsp = yyvs = yyvsa;
    yystacksize = YYINITDEPTH;

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

    yystate = 0;
    yyerrstatus = 0;
    yynerrs = 0;
    yychar = YYEMPTY; /* Cause a token to be read.  */
    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 -- set current state (the top of the stack) to yystate.  |
`--------------------------------------------------------------------*/
yysetstate:
    YYDPRINTF((stderr, "Entering state %d\n", yystate));
    YY_ASSERT(0 <= yystate && yystate < YYNSTATES);
    YY_IGNORE_USELESS_CAST_BEGIN
    *yyssp = YY_CAST(yy_state_t, yystate);
    YY_IGNORE_USELESS_CAST_END

    if (yyss + yystacksize - 1 <= yyssp)
#if !defined yyoverflow && !defined YYSTACK_RELOCATE
        goto yyexhaustedlab;
#else
    {
        /* Get the current used size of the three stacks, in elements.  */
        YYPTRDIFF_T yysize = yyssp - yyss + 1;

#if defined 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.  */
            yy_state_t *yyss1 = yyss;
            YYSTYPE *yyvs1 = yyvs;

            /* 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(YY_("memory exhausted"), &yyss1, yysize * YYSIZEOF(*yyssp), &yyvs1, yysize * YYSIZEOF(*yyvsp), &yystacksize);
            yyss = yyss1;
            yyvs = yyvs1;
        }
#else /* defined YYSTACK_RELOCATE */
        /* Extend the stack our own way.  */
        if (YYMAXDEPTH <= yystacksize)
        {
            goto yyexhaustedlab;
        }
        yystacksize *= 2;
        if (YYMAXDEPTH < yystacksize)
        {
            yystacksize = YYMAXDEPTH;
        }

        {
            yy_state_t *yyss1 = yyss;
            union yyalloc *yyptr = YY_CAST(union yyalloc *, YYSTACK_ALLOC(YY_CAST(YYSIZE_T, YYSTACK_BYTES(yystacksize))));
            if (!yyptr)
            {
                goto yyexhaustedlab;
            }
            YYSTACK_RELOCATE(yyss_alloc, yyss);
            YYSTACK_RELOCATE(yyvs_alloc, yyvs);
#undef YYSTACK_RELOCATE
            if (yyss1 != yyssa)
            {
                YYSTACK_FREE(yyss1);
            }
        }
#endif

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

        YY_IGNORE_USELESS_CAST_BEGIN
        YYDPRINTF((stderr, "Stack size increased to %ld\n", YY_CAST(long, yystacksize)));
        YY_IGNORE_USELESS_CAST_END

        if (yyss + yystacksize - 1 <= yyssp)
        {
            YYABORT;
        }
    }
#endif /* !defined yyoverflow && !defined YYSTACK_RELOCATE */

    if (yystate == YYFINAL)
    {
        YYACCEPT;
    }

    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.  */

    /* First try to decide what to do without reference to lookahead token.  */
    yyn = yypact[yystate];
    if (yypact_value_is_default(yyn))
    {
        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(&yylval, pc);
    }

    if (yychar <= YYEOF)
    {
        yychar = yytoken = YYEOF;
        YYDPRINTF((stderr, "Now at end of input.\n"));
    }
    else
    {
        yytoken = YYTRANSLATE(yychar);
        YY_SYMBOL_PRINT("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 (yytable_value_is_error(yyn))
        {
            goto yyerrlab;
        }
        yyn = -yyn;
        goto yyreduce;
    }

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

    /* Shift the lookahead token.  */
    YY_SYMBOL_PRINT("Shifting", yytoken, &yylval, &yylloc);
    yystate = yyn;
    YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
    *++yyvsp = yylval;
    YY_IGNORE_MAYBE_UNINITIALIZED_END

    /* Discard the shifted token.  */
    yychar = YYEMPTY;
    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:
#line 343 "common/parse-datetime.y"
    {
        pc->seconds = (yyvsp[0].timespec);
        pc->timespec_seen = true;
    }
#line 1716 "common/parse-datetime.c"
    break;

    case 7:
#line 356 "common/parse-datetime.y"
    {
        pc->times_seen++;
        pc->dates_seen++;
    }
#line 1722 "common/parse-datetime.c"
    break;

    case 8:
#line 358 "common/parse-datetime.y"
    {
        pc->times_seen++;
    }
#line 1728 "common/parse-datetime.c"
    break;

    case 9:
#line 360 "common/parse-datetime.y"
    {
        pc->local_zones_seen++;
    }
#line 1734 "common/parse-datetime.c"
    break;

    case 10:
#line 362 "common/parse-datetime.y"
    {
        pc->zones_seen++;
    }
#line 1740 "common/parse-datetime.c"
    break;

    case 11:
#line 364 "common/parse-datetime.y"
    {
        pc->dates_seen++;
    }
#line 1746 "common/parse-datetime.c"
    break;

    case 12:
#line 366 "common/parse-datetime.y"
    {
        pc->days_seen++;
    }
#line 1752 "common/parse-datetime.c"
    break;

    case 18:
#line 382 "common/parse-datetime.y"
    {
        set_hhmmss(pc, (yyvsp[-1].textintval).value, 0, 0, 0);
        pc->meridian = (yyvsp[0].intval);
    }
#line 1761 "common/parse-datetime.c"
    break;

    case 19:
#line 387 "common/parse-datetime.y"
    {
        set_hhmmss(pc, (yyvsp[-3].textintval).value, (yyvsp[-1].textintval).value, 0, 0);
        pc->meridian = (yyvsp[0].intval);
    }
#line 1770 "common/parse-datetime.c"
    break;

    case 20:
#line 392 "common/parse-datetime.y"
    {
        set_hhmmss(pc, (yyvsp[-5].textintval).value, (yyvsp[-3].textintval).value, (yyvsp[-1].timespec).tv_sec, (yyvsp[-1].timespec).tv_nsec);
        pc->meridian = (yyvsp[0].intval);
    }
#line 1779 "common/parse-datetime.c"
    break;

    case 22:
#line 401 "common/parse-datetime.y"
    {
        set_hhmmss(pc, (yyvsp[-1].textintval).value, 0, 0, 0);
        pc->meridian = MER24;
    }
#line 1788 "common/parse-datetime.c"
    break;

    case 23:
#line 406 "common/parse-datetime.y"
    {
        set_hhmmss(pc, (yyvsp[-3].textintval).value, (yyvsp[-1].textintval).value, 0, 0);
        pc->meridian = MER24;
    }
#line 1797 "common/parse-datetime.c"
    break;

    case 24:
#line 411 "common/parse-datetime.y"
    {
        set_hhmmss(pc, (yyvsp[-5].textintval).value, (yyvsp[-3].textintval).value, (yyvsp[-1].timespec).tv_sec, (yyvsp[-1].timespec).tv_nsec);
        pc->meridian = MER24;
    }
#line 1806 "common/parse-datetime.c"
    break;

    case 27:
#line 424 "common/parse-datetime.y"
    {
        pc->zones_seen++;
        pc->time_zone = time_zone_hhmm(pc, (yyvsp[-1].textintval), (yyvsp[0].intval));
    }
#line 1815 "common/parse-datetime.c"
    break;

    case 28:
#line 432 "common/parse-datetime.y"
    {
        pc->local_isdst = (yyvsp[0].intval);
        pc->dsts_seen += (0 < (yyvsp[0].intval));
    }
#line 1824 "common/parse-datetime.c"
    break;

    case 29:
#line 437 "common/parse-datetime.y"
    {
        pc->local_isdst = 1;
        pc->dsts_seen += (0 < (yyvsp[-1].intval)) + 1;
    }
#line 1833 "common/parse-datetime.c"
    break;

    case 30:
#line 447 "common/parse-datetime.y"
    {
        pc->time_zone = (yyvsp[0].intval);
    }
#line 1839 "common/parse-datetime.c"
    break;

    case 31:
#line 449 "common/parse-datetime.y"
    {
        pc->time_zone = HOUR(7);
    }
#line 1845 "common/parse-datetime.c"
    break;

    case 32:
#line 451 "common/parse-datetime.y"
    {
        pc->time_zone = (yyvsp[-1].intval);
        apply_relative_time(pc, (yyvsp[0].rel), 1);
    }
#line 1852 "common/parse-datetime.c"
    break;

    case 33:
#line 454 "common/parse-datetime.y"
    {
        pc->time_zone = HOUR(7);
        apply_relative_time(pc, (yyvsp[0].rel), 1);
    }
#line 1859 "common/parse-datetime.c"
    break;

    case 34:
#line 457 "common/parse-datetime.y"
    {
        pc->time_zone = (yyvsp[-2].intval) + time_zone_hhmm(pc, (yyvsp[-1].textintval), (yyvsp[0].intval));
    }
#line 1865 "common/parse-datetime.c"
    break;

    case 35:
#line 459 "common/parse-datetime.y"
    {
        pc->time_zone = (yyvsp[0].intval) + 60;
    }
#line 1871 "common/parse-datetime.c"
    break;

    case 36:
#line 461 "common/parse-datetime.y"
    {
        pc->time_zone = (yyvsp[-1].intval) + 60;
    }
#line 1877 "common/parse-datetime.c"
    break;

    case 37:
#line 466 "common/parse-datetime.y"
    {
        pc->day_ordinal = 0;
        pc->day_number = (yyvsp[0].intval);
    }
#line 1886 "common/parse-datetime.c"
    break;

    case 38:
#line 471 "common/parse-datetime.y"
    {
        pc->day_ordinal = 0;
        pc->day_number = (yyvsp[-1].intval);
    }
#line 1895 "common/parse-datetime.c"
    break;

    case 39:
#line 476 "common/parse-datetime.y"
    {
        pc->day_ordinal = (yyvsp[-1].intval);
        pc->day_number = (yyvsp[0].intval);
    }
#line 1904 "common/parse-datetime.c"
    break;

    case 40:
#line 481 "common/parse-datetime.y"
    {
        pc->day_ordinal = (yyvsp[-1].textintval).value;
        pc->day_number = (yyvsp[0].intval);
    }
#line 1913 "common/parse-datetime.c"
    break;

    case 41:
#line 489 "common/parse-datetime.y"
    {
        pc->month = (yyvsp[-2].textintval).value;
        pc->day = (yyvsp[0].textintval).value;
    }
#line 1922 "common/parse-datetime.c"
    break;

    case 42:
#line 494 "common/parse-datetime.y"
    {
        /* Interpret as YYYY/MM/DD if the first value has 4 or more digits,
           otherwise as MM/DD/YY.
           The goal in recognizing YYYY/MM/DD is solely to support legacy
           machine-generated dates like those in an RCS log listing.  If
           you want portability, use the ISO 8601 format.  */
        if (4 <= (yyvsp[-4].textintval).digits)
        {
            pc->year = (yyvsp[-4].textintval);
            pc->month = (yyvsp[-2].textintval).value;
            pc->day = (yyvsp[0].textintval).value;
        }
        else
        {
            pc->month = (yyvsp[-4].textintval).value;
            pc->day = (yyvsp[-2].textintval).value;
            pc->year = (yyvsp[0].textintval);
        }
    }
#line 1946 "common/parse-datetime.c"
    break;

    case 43:
#line 514 "common/parse-datetime.y"
    {
        /* e.g. 17-JUN-1992.  */
        pc->day = (yyvsp[-2].textintval).value;
        pc->month = (yyvsp[-1].intval);
        pc->year.value = -(yyvsp[0].textintval).value;
        pc->year.digits = (yyvsp[0].textintval).digits;
    }
#line 1958 "common/parse-datetime.c"
    break;

    case 44:
#line 522 "common/parse-datetime.y"
    {
        /* e.g. JUN-17-1992.  */
        pc->month = (yyvsp[-2].intval);
        pc->day = -(yyvsp[-1].textintval).value;
        pc->year.value = -(yyvsp[0].textintval).value;
        pc->year.digits = (yyvsp[0].textintval).digits;
    }
#line 1970 "common/parse-datetime.c"
    break;

    case 45:
#line 530 "common/parse-datetime.y"
    {
        pc->month = (yyvsp[-1].intval);
        pc->day = (yyvsp[0].textintval).value;
    }
#line 1979 "common/parse-datetime.c"
    break;

    case 46:
#line 535 "common/parse-datetime.y"
    {
        pc->month = (yyvsp[-3].intval);
        pc->day = (yyvsp[-2].textintval).value;
        pc->year = (yyvsp[0].textintval);
    }
#line 1989 "common/parse-datetime.c"
    break;

    case 47:
#line 541 "common/parse-datetime.y"
    {
        pc->day = (yyvsp[-1].textintval).value;
        pc->month = (yyvsp[0].intval);
    }
#line 1998 "common/parse-datetime.c"
    break;

    case 48:
#line 546 "common/parse-datetime.y"
    {
        pc->day = (yyvsp[-2].textintval).value;
        pc->month = (yyvsp[-1].intval);
        pc->year = (yyvsp[0].textintval);
    }
#line 2008 "common/parse-datetime.c"
    break;

    case 50:
#line 556 "common/parse-datetime.y"
    {
        /* ISO 8601 format.  YYYY-MM-DD.  */
        pc->year = (yyvsp[-2].textintval);
        pc->month = -(yyvsp[-1].textintval).value;
        pc->day = -(yyvsp[0].textintval).value;
    }
#line 2019 "common/parse-datetime.c"
    break;

    case 51:
#line 566 "common/parse-datetime.y"
    {
        apply_relative_time(pc, (yyvsp[-1].rel), (yyvsp[0].intval));
    }
#line 2025 "common/parse-datetime.c"
    break;

    case 52:
#line 568 "common/parse-datetime.y"
    {
        apply_relative_time(pc, (yyvsp[0].rel), 1);
    }
#line 2031 "common/parse-datetime.c"
    break;

    case 53:
#line 570 "common/parse-datetime.y"
    {
        apply_relative_time(pc, (yyvsp[0].rel), 1);
    }
#line 2037 "common/parse-datetime.c"
    break;

    case 54:
#line 575 "common/parse-datetime.y"
    {
        (yyval.rel) = RELATIVE_TIME_0;
        (yyval.rel).year = (yyvsp[-1].intval);
    }
#line 2043 "common/parse-datetime.c"
    break;

    case 55:
#line 577 "common/parse-datetime.y"
    {
        (yyval.rel) = RELATIVE_TIME_0;
        (yyval.rel).year = (yyvsp[-1].textintval).value;
    }
#line 2049 "common/parse-datetime.c"
    break;

    case 56:
#line 579 "common/parse-datetime.y"
    {
        (yyval.rel) = RELATIVE_TIME_0;
        (yyval.rel).year = 1;
    }
#line 2055 "common/parse-datetime.c"
    break;

    case 57:
#line 581 "common/parse-datetime.y"
    {
        (yyval.rel) = RELATIVE_TIME_0;
        (yyval.rel).month = (yyvsp[-1].intval);
    }
#line 2061 "common/parse-datetime.c"
    break;

    case 58:
#line 583 "common/parse-datetime.y"
    {
        (yyval.rel) = RELATIVE_TIME_0;
        (yyval.rel).month = (yyvsp[-1].textintval).value;
    }
#line 2067 "common/parse-datetime.c"
    break;

    case 59:
#line 585 "common/parse-datetime.y"
    {
        (yyval.rel) = RELATIVE_TIME_0;
        (yyval.rel).month = 1;
    }
#line 2073 "common/parse-datetime.c"
    break;

    case 60:
#line 587 "common/parse-datetime.y"
    {
        (yyval.rel) = RELATIVE_TIME_0;
        (yyval.rel).day = (yyvsp[-1].intval) * (yyvsp[0].intval);
    }
#line 2079 "common/parse-datetime.c"
    break;

    case 61:
#line 589 "common/parse-datetime.y"
    {
        (yyval.rel) = RELATIVE_TIME_0;
        (yyval.rel).day = (yyvsp[-1].textintval).value * (yyvsp[0].intval);
    }
#line 2085 "common/parse-datetime.c"
    break;

    case 62:
#line 591 "common/parse-datetime.y"
    {
        (yyval.rel) = RELATIVE_TIME_0;
        (yyval.rel).day = (yyvsp[0].intval);
    }
#line 2091 "common/parse-datetime.c"
    break;

    case 63:
#line 593 "common/parse-datetime.y"
    {
        (yyval.rel) = RELATIVE_TIME_0;
        (yyval.rel).hour = (yyvsp[-1].intval);
    }
#line 2097 "common/parse-datetime.c"
    break;

    case 64:
#line 595 "common/parse-datetime.y"
    {
        (yyval.rel) = RELATIVE_TIME_0;
        (yyval.rel).hour = (yyvsp[-1].textintval).value;
    }
#line 2103 "common/parse-datetime.c"
    break;

    case 65:
#line 597 "common/parse-datetime.y"
    {
        (yyval.rel) = RELATIVE_TIME_0;
        (yyval.rel).hour = 1;
    }
#line 2109 "common/parse-datetime.c"
    break;

    case 66:
#line 599 "common/parse-datetime.y"
    {
        (yyval.rel) = RELATIVE_TIME_0;
        (yyval.rel).minutes = (yyvsp[-1].intval);
    }
#line 2115 "common/parse-datetime.c"
    break;

    case 67:
#line 601 "common/parse-datetime.y"
    {
        (yyval.rel) = RELATIVE_TIME_0;
        (yyval.rel).minutes = (yyvsp[-1].textintval).value;
    }
#line 2121 "common/parse-datetime.c"
    break;

    case 68:
#line 603 "common/parse-datetime.y"
    {
        (yyval.rel) = RELATIVE_TIME_0;
        (yyval.rel).minutes = 1;
    }
#line 2127 "common/parse-datetime.c"
    break;

    case 69:
#line 605 "common/parse-datetime.y"
    {
        (yyval.rel) = RELATIVE_TIME_0;
        (yyval.rel).seconds = (yyvsp[-1].intval);
    }
#line 2133 "common/parse-datetime.c"
    break;

    case 70:
#line 607 "common/parse-datetime.y"
    {
        (yyval.rel) = RELATIVE_TIME_0;
        (yyval.rel).seconds = (yyvsp[-1].textintval).value;
    }
#line 2139 "common/parse-datetime.c"
    break;

    case 71:
#line 609 "common/parse-datetime.y"
    {
        (yyval.rel) = RELATIVE_TIME_0;
        (yyval.rel).seconds = (yyvsp[-1].timespec).tv_sec;
        (yyval.rel).ns = (yyvsp[-1].timespec).tv_nsec;
    }
#line 2145 "common/parse-datetime.c"
    break;

    case 72:
#line 611 "common/parse-datetime.y"
    {
        (yyval.rel) = RELATIVE_TIME_0;
        (yyval.rel).seconds = (yyvsp[-1].timespec).tv_sec;
        (yyval.rel).ns = (yyvsp[-1].timespec).tv_nsec;
    }
#line 2151 "common/parse-datetime.c"
    break;

    case 73:
#line 613 "common/parse-datetime.y"
    {
        (yyval.rel) = RELATIVE_TIME_0;
        (yyval.rel).seconds = 1;
    }
#line 2157 "common/parse-datetime.c"
    break;

    case 75:
#line 619 "common/parse-datetime.y"
    {
        (yyval.rel) = RELATIVE_TIME_0;
        (yyval.rel).year = (yyvsp[-1].textintval).value;
    }
#line 2163 "common/parse-datetime.c"
    break;

    case 76:
#line 621 "common/parse-datetime.y"
    {
        (yyval.rel) = RELATIVE_TIME_0;
        (yyval.rel).month = (yyvsp[-1].textintval).value;
    }
#line 2169 "common/parse-datetime.c"
    break;

    case 77:
#line 623 "common/parse-datetime.y"
    {
        (yyval.rel) = RELATIVE_TIME_0;
        (yyval.rel).day = (yyvsp[-1].textintval).value * (yyvsp[0].intval);
    }
#line 2175 "common/parse-datetime.c"
    break;

    case 78:
#line 625 "common/parse-datetime.y"
    {
        (yyval.rel) = RELATIVE_TIME_0;
        (yyval.rel).hour = (yyvsp[-1].textintval).value;
    }
#line 2181 "common/parse-datetime.c"
    break;

    case 79:
#line 627 "common/parse-datetime.y"
    {
        (yyval.rel) = RELATIVE_TIME_0;
        (yyval.rel).minutes = (yyvsp[-1].textintval).value;
    }
#line 2187 "common/parse-datetime.c"
    break;

    case 80:
#line 629 "common/parse-datetime.y"
    {
        (yyval.rel) = RELATIVE_TIME_0;
        (yyval.rel).seconds = (yyvsp[-1].textintval).value;
    }
#line 2193 "common/parse-datetime.c"
    break;

    case 81:
#line 634 "common/parse-datetime.y"
    {
        (yyval.rel) = RELATIVE_TIME_0;
        (yyval.rel).day = (yyvsp[0].intval);
    }
#line 2199 "common/parse-datetime.c"
    break;

    case 85:
#line 642 "common/parse-datetime.y"
    {
        (yyval.timespec).tv_sec = (yyvsp[0].textintval).value;
        (yyval.timespec).tv_nsec = 0;
    }
#line 2205 "common/parse-datetime.c"
    break;

    case 87:
#line 648 "common/parse-datetime.y"
    {
        (yyval.timespec).tv_sec = (yyvsp[0].textintval).value;
        (yyval.timespec).tv_nsec = 0;
    }
#line 2211 "common/parse-datetime.c"
    break;

    case 88:
#line 653 "common/parse-datetime.y"
    {
        digits_to_date_time(pc, (yyvsp[0].textintval));
    }
#line 2217 "common/parse-datetime.c"
    break;

    case 89:
#line 658 "common/parse-datetime.y"
    {
        /* Hybrid all-digit and relative offset, so that we accept e.g.,
           "YYYYMMDD +N days" as well as "YYYYMMDD N days".  */
        digits_to_date_time(pc, (yyvsp[-1].textintval));
        apply_relative_time(pc, (yyvsp[0].rel), 1);
    }
#line 2228 "common/parse-datetime.c"
    break;

    case 90:
#line 668 "common/parse-datetime.y"
    {
        (yyval.intval) = -1;
    }
#line 2234 "common/parse-datetime.c"
    break;

    case 91:
#line 670 "common/parse-datetime.y"
    {
        (yyval.intval) = (yyvsp[0].textintval).value;
    }
#line 2240 "common/parse-datetime.c"
    break;

#line 2244 "common/parse-datetime.c"

    default:
        break;
    }
    /* User semantic actions sometimes alter yychar, and that requires
     that yytoken be updated with the new translation.  We take the
     approach of translating immediately before every use of yytoken.
     One alternative is translating here after every semantic action,
     but that translation would be missed if the semantic action invokes
     YYABORT, YYACCEPT, or YYERROR immediately after altering yychar or
     if it invokes YYBACKUP.  In the case of YYABORT or YYACCEPT, an
     incorrect destructor might then be invoked immediately.  In the
     case of YYERROR or YYBACKUP, subsequent parser actions might lead
     to an incorrect destructor call or verbose syntax error message
     before the lookahead is translated.  */
    YY_SYMBOL_PRINT("-> $$ =", yyr1[yyn], &yyval, &yyloc);

    YYPOPSTACK(yylen);
    yylen = 0;
    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.  */
    {
        const int yylhs = yyr1[yyn] - YYNTOKENS;
        const int yyi = yypgoto[yylhs] + *yyssp;
        yystate = (0 <= yyi && yyi <= YYLAST && yycheck[yyi] == *yyssp ? yytable[yyi] : yydefgoto[yylhs]);
    }

    goto yynewstate;

/*--------------------------------------.
| yyerrlab -- here on detecting error.  |
`--------------------------------------*/
yyerrlab:
    /* Make sure we have latest lookahead translation.  See comments at
     user semantic actions for why this is necessary.  */
    yytoken = yychar == YYEMPTY ? YYEMPTY : YYTRANSLATE(yychar);

    /* If not already recovering from an error, report this error.  */
    if (!yyerrstatus)
    {
        ++yynerrs;
#if !YYERROR_VERBOSE
        yyerror(pc, YY_("syntax error"));
#else
#define YYSYNTAX_ERROR yysyntax_error(&yymsg_alloc, &yymsg, yyssp, yytoken)
        {
            char const *yymsgp = YY_("syntax error");
            int yysyntax_error_status;
            yysyntax_error_status = YYSYNTAX_ERROR;
            if (yysyntax_error_status == 0)
            {
                yymsgp = yymsg;
            }
            else if (yysyntax_error_status == 1)
            {
                if (yymsg != yymsgbuf)
                {
                    YYSTACK_FREE(yymsg);
                }
                yymsg = YY_CAST(char *, YYSTACK_ALLOC(YY_CAST(YYSIZE_T, yymsg_alloc)));
                if (!yymsg)
                {
                    yymsg = yymsgbuf;
                    yymsg_alloc = sizeof yymsgbuf;
                    yysyntax_error_status = 2;
                }
                else
                {
                    yysyntax_error_status = YYSYNTAX_ERROR;
                    yymsgp = yymsg;
                }
            }
            yyerror(pc, yymsgp);
            if (yysyntax_error_status == 2)
            {
                goto yyexhaustedlab;
            }
        }
#undef YYSYNTAX_ERROR
#endif
    }

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

        if (yychar <= YYEOF)
        {
            /* Return failure if at end of input.  */
            if (yychar == YYEOF)
            {
                YYABORT;
            }
        }
        else
        {
            yydestruct("Error: discarding", yytoken, &yylval, pc);
            yychar = YYEMPTY;
        }
    }

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

/*---------------------------------------------------.
| yyerrorlab -- error raised explicitly by YYERROR.  |
`---------------------------------------------------*/
yyerrorlab:
    /* Pacify compilers when the user code never invokes YYERROR and the
     label yyerrorlab therefore never appears in user code.  */
    if (0)
    {
        YYERROR;
    }

    /* Do not reclaim the symbols of the rule whose action triggered
     this YYERROR.  */
    YYPOPSTACK(yylen);
    yylen = 0;
    YY_STACK_PRINT(yyss, yyssp);
    yystate = *yyssp;
    goto yyerrlab1;

/*-------------------------------------------------------------.
| yyerrlab1 -- common code for both syntax error and YYERROR.  |
`-------------------------------------------------------------*/
yyerrlab1:
    yyerrstatus = 3; /* Each real token shifted decrements this.  */

    for (;;)
    {
        yyn = yypact[yystate];
        if (!yypact_value_is_default(yyn))
        {
            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;
        }

        yydestruct("Error: popping", yystos[yystate], yyvsp, pc);
        YYPOPSTACK(1);
        yystate = *yyssp;
        YY_STACK_PRINT(yyss, yyssp);
    }

    YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
    *++yyvsp = yylval;
    YY_IGNORE_MAYBE_UNINITIALIZED_END

    /* Shift the error token.  */
    YY_SYMBOL_PRINT("Shifting", yystos[yyn], yyvsp, yylsp);

    yystate = yyn;
    goto yynewstate;

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

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

#if !defined yyoverflow || YYERROR_VERBOSE
/*-------------------------------------------------.
| yyexhaustedlab -- memory exhaustion comes here.  |
`-------------------------------------------------*/
yyexhaustedlab:
    yyerror(pc, YY_("memory exhausted"));
    yyresult = 2;
    /* Fall through.  */
#endif

/*-----------------------------------------------------.
| yyreturn -- parsing is finished, return the result.  |
`-----------------------------------------------------*/
yyreturn:
    if (yychar != YYEMPTY)
    {
        /* Make sure we have latest lookahead translation.  See comments at
         user semantic actions for why this is necessary.  */
        yytoken = YYTRANSLATE(yychar);
        yydestruct("Cleanup: discarding lookahead", yytoken, &yylval, pc);
    }
    /* Do not reclaim the symbols of the rule whose action triggered
     this YYABORT or YYACCEPT.  */
    YYPOPSTACK(yylen);
    YY_STACK_PRINT(yyss, yyssp);
    while (yyssp != yyss)
    {
        yydestruct("Cleanup: popping", yystos[+*yyssp], yyvsp, pc);
        YYPOPSTACK(1);
    }
#ifndef yyoverflow
    if (yyss != yyssa)
    {
        YYSTACK_FREE(yyss);
    }
#endif
#if YYERROR_VERBOSE
    if (yymsg != yymsgbuf)
    {
        YYSTACK_FREE(yymsg);
    }
#endif
    return yyresult;
}
#line 673 "common/parse-datetime.y"

static table const meridian_table[] = { { "AM", tMERIDIAN, MERam }, { "A.M.", tMERIDIAN, MERam }, { "PM", tMERIDIAN, MERpm }, { "P.M.", tMERIDIAN, MERpm }, { NULL, 0, 0 } };

static table const dst_table[] = { { "DST", tDST, 0 } };

static table const month_and_day_table[] = { { "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 } };

static table const time_units_table[] = {
    { "YEAR", tYEAR_UNIT, 1 },     { "MONTH", tMONTH_UNIT, 1 }, { "FORTNIGHT", tDAY_UNIT, 14 }, { "WEEK", tDAY_UNIT, 7 }, { "DAY", tDAY_UNIT, 1 }, { "HOUR", tHOUR_UNIT, 1 },
    { "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 relative_time_table[] = { { "TOMORROW", tDAY_SHIFT, 1 },
                                             { "YESTERDAY", tDAY_SHIFT, -1 },
                                             { "TODAY", tDAY_SHIFT, 0 },
                                             { "NOW", tDAY_SHIFT, 0 },
                                             { "LAST", tORDINAL, -1 },
                                             { "THIS", tORDINAL, 0 },
                                             { "NEXT", tORDINAL, 1 },
                                             { "FIRST", tORDINAL, 1 },
                                             /*{ "SECOND",   tORDINAL,        2 }, */
                                             { "THIRD", tORDINAL, 3 },
                                             { "FOURTH", tORDINAL, 4 },
                                             { "FIFTH", tORDINAL, 5 },
                                             { "SIXTH", tORDINAL, 6 },
                                             { "SEVENTH", tORDINAL, 7 },
                                             { "EIGHTH", tORDINAL, 8 },
                                             { "NINTH", tORDINAL, 9 },
                                             { "TENTH", tORDINAL, 10 },
                                             { "ELEVENTH", tORDINAL, 11 },
                                             { "TWELFTH", tORDINAL, 12 },
                                             { "AGO", tAGO, -1 },
                                             { "HENCE", tAGO, 1 },
                                             { NULL, 0, 0 } };

/* The universal time zone table.  These labels can be used even for
   time stamps that would not otherwise be valid, e.g., GMT time
   stamps in London during summer.  */
static table const universal_time_zone_table[] = { { "GMT", tZONE, HOUR(0) }, /* Greenwich Mean */
                                                   { "UT", tZONE, HOUR(0) },  /* Universal (Coordinated) */
                                                   { "UTC", tZONE, HOUR(0) },
                                                   { NULL, 0, 0 } };

/* The time zone table.  This table is necessarily incomplete, as time
   zone abbreviations are ambiguous; e.g. Australians interpret "EST"
   as Eastern time in Australia, not as US Eastern Standard Time.
   You cannot rely on parse_datetime to handle arbitrary time zone
   abbreviations; use numeric abbreviations like "-0500" instead.  */
static table const time_zone_table[] = { { "WET", tZONE, HOUR(0) },            /* Western European */
                                         { "WEST", tDAYZONE, HOUR(0) },        /* Western European Summer */
                                         { "BST", tDAYZONE, HOUR(0) },         /* British Summer */
                                         { "ART", tZONE, -HOUR(3) },           /* Argentina */
                                         { "BRT", tZONE, -HOUR(3) },           /* Brazil */
                                         { "BRST", tDAYZONE, -HOUR(3) },       /* Brazil 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 */
                                         { "CLT", tZONE, -HOUR(4) },           /* Chile */
                                         { "CLST", tDAYZONE, -HOUR(4) },       /* Chile Summer */
                                         { "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 */
                                         { "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 */
                                         { "SST", tZONE, -HOUR(12) },          /* Samoa Standard */
                                         { "WAT", tZONE, HOUR(1) },            /* West Africa */
                                         { "CET", tZONE, HOUR(1) },            /* Central European */
                                         { "CEST", tDAYZONE, HOUR(1) },        /* Central European Summer */
                                         { "MET", tZONE, HOUR(1) },            /* Middle European */
                                         { "MEZ", tZONE, HOUR(1) },            /* Middle European */
                                         { "MEST", tDAYZONE, HOUR(1) },        /* Middle European Summer */
                                         { "MESZ", tDAYZONE, HOUR(1) },        /* Middle European Summer */
                                         { "EET", tZONE, HOUR(2) },            /* Eastern European */
                                         { "EEST", tDAYZONE, HOUR(2) },        /* Eastern European Summer */
                                         { "CAT", tZONE, HOUR(2) },            /* Central Africa */
                                         { "SAST", tZONE, HOUR(2) },           /* South Africa Standard */
                                         { "EAT", tZONE, HOUR(3) },            /* East Africa */
                                         { "MSK", tZONE, HOUR(3) },            /* Moscow */
                                         { "MSD", tDAYZONE, HOUR(3) },         /* Moscow Daylight */
                                         { "IST", tZONE, (HOUR(5) + 30) },     /* India Standard */
                                         { "SGT", tZONE, HOUR(8) },            /* Singapore */
                                         { "KST", tZONE, HOUR(9) },            /* Korea Standard */
                                         { "JST", tZONE, HOUR(9) },            /* Japan Standard */
                                         { "GST", tZONE, HOUR(10) },           /* Guam Standard */
                                         { "NZST", tZONE, HOUR(12) },          /* New Zealand Standard */
                                         { "NZDT", tDAYZONE, HOUR(12) },       /* New Zealand Daylight */
                                         { NULL, 0, 0 } };

/* Military time zone table.

   Note 'T' is a special case, as it is used as the separator in ISO
   8601 date and time of day representation. */
static table const military_table[] = { { "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", 'T', 0 },           { "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 } };

/* Convert a time zone expressed as HH:MM into an integer count of
   minutes.  If MM is negative, then S is of the form HHMM and needs
   to be picked apart; otherwise, S is of the form HH.  As specified in
   http://www.opengroup.org/susv3xbd/xbd_chap08.html#tag_08_03, allow
   only valid TZ range, and consider first two digits as hours, if no
   minutes specified.  */

static long int time_zone_hhmm(parser_control *pc, textint s, long int mm)
{
    long int n_minutes;

    /* If the length of S is 1 or 2 and no minutes are specified,
     interpret it as a number of hours.  */
    if (s.digits <= 2 && mm < 0)
    {
        s.value *= 100;
    }

    if (mm < 0)
    {
        n_minutes = (s.value / 100) * 60 + s.value % 100;
    }
    else
    {
        n_minutes = s.value * 60 + (s.negative ? -mm : mm);
    }

    /* If the absolute number of minutes is larger than 24 hours,
     arrange to reject it by incrementing pc->zones_seen.  Thus,
     we allow only values in the range UTC-24:00 to UTC+24:00.  */
    if (24 * 60 < labs(n_minutes))
    {
        pc->zones_seen++;
    }

    return n_minutes;
}

static int to_hour(long int hours, int meridian)
{
    switch (meridian)
    {
    default: /* Pacify GCC.  */
    case MER24:
        return 0 <= hours && hours < 24 ? hours : -1;
    case MERam:
        return 0 < hours && hours < 12 ? hours : hours == 12 ? 0 : -1;
    case MERpm:
        return 0 < hours && hours < 12 ? hours + 12 : hours == 12 ? 12 : -1;
    }
}

static long int to_year(textint textyear)
{
    long int year = textyear.value;

    if (year < 0)
    {
        year = -year;
    }

    /* XPG4 suggests that years 00-68 map to 2000-2068, and
     years 69-99 map to 1969-1999.  */
    else if (textyear.digits == 2)
    {
        year += year < 69 ? 2000 : 1900;
    }

    return year;
}

static table const *lookup_zone(parser_control const *pc, char const *name)
{
    table const *tp;

    for (tp = universal_time_zone_table; tp->name; tp++)
    {
        if (strcmp(name, tp->name) == 0)
        {
            return tp;
        }
    }

    /* Try local zone abbreviations before those in time_zone_table, as
     the local ones are more likely to be right.  */
    for (tp = pc->local_time_zone_table; tp->name; tp++)
    {
        if (strcmp(name, tp->name) == 0)
        {
            return tp;
        }
    }

    for (tp = time_zone_table; tp->name; tp++)
    {
        if (strcmp(name, tp->name) == 0)
        {
            return tp;
        }
    }

    return NULL;
}

// #if ! HAVE_TM_GMTOFF
#if 1 // Always true for us
/* Yield the difference between *A and *B,
   measured in seconds, ignoring leap seconds.
   The body of this function is taken directly from the GNU C Library;
   see src/strftime.c.  */
static long int tm_diff(struct tm const *a, struct tm const *b)
{
    /* Compute intervening leap days correctly even if year is negative.
     Take care to avoid int overflow in leap day calculations.  */
    int a4 = SHR(a->tm_year, 2) + SHR(TM_YEAR_BASE, 2) - !(a->tm_year & 3);
    int b4 = SHR(b->tm_year, 2) + SHR(TM_YEAR_BASE, 2) - !(b->tm_year & 3);
    int a100 = a4 / 25 - (a4 % 25 < 0);
    int b100 = b4 / 25 - (b4 % 25 < 0);
    int a400 = SHR(a100, 2);
    int b400 = SHR(b100, 2);
    int intervening_leap_days = (a4 - b4) - (a100 - b100) + (a400 - b400);
    long int ayear = a->tm_year;
    long int years = ayear - b->tm_year;
    long int days = (365 * years + intervening_leap_days + (a->tm_yday - b->tm_yday));
    return (60 * (60 * (24 * days + (a->tm_hour - b->tm_hour)) + (a->tm_min - b->tm_min)) + (a->tm_sec - b->tm_sec));
}
#endif /* ! HAVE_TM_GMTOFF */

static table const *lookup_word(parser_control const *pc, char *word)
{
    char *p;
    char *q;
    size_t wordlen;
    table const *tp;
    bool period_found;
    bool abbrev;

    /* Make it uppercase.  */
    for (p = word; *p; p++)
    {
        unsigned char ch = *p;
        *p = toupper(ch);
    }

    for (tp = meridian_table; tp->name; tp++)
    {
        if (strcmp(word, tp->name) == 0)
        {
            return tp;
        }
    }

    /* See if we have an abbreviation for a month. */
    wordlen = strlen(word);
    abbrev = wordlen == 3 || (wordlen == 4 && word[3] == '.');

    for (tp = month_and_day_table; tp->name; tp++)
    {
        if ((abbrev ? strncmp(word, tp->name, 3) : strcmp(word, tp->name)) == 0)
        {
            return tp;
        }
    }

    if ((tp = lookup_zone(pc, word)))
    {
        return tp;
    }

    if (strcmp(word, dst_table[0].name) == 0)
    {
        return dst_table;
    }

    for (tp = time_units_table; tp->name; tp++)
    {
        if (strcmp(word, tp->name) == 0)
        {
            return tp;
        }
    }

    /* Strip off any plural and try the units table again. */
    if (word[wordlen - 1] == 'S')
    {
        word[wordlen - 1] = '\0';
        for (tp = time_units_table; tp->name; tp++)
        {
            if (strcmp(word, tp->name) == 0)
            {
                return tp;
            }
        }
        word[wordlen - 1] = 'S'; /* For "this" in relative_time_table.  */
    }

    for (tp = relative_time_table; tp->name; tp++)
    {
        if (strcmp(word, tp->name) == 0)
        {
            return tp;
        }
    }

    /* Military time zones. */
    if (wordlen == 1)
    {
        for (tp = military_table; tp->name; tp++)
        {
            if (word[0] == tp->name[0])
            {
                return tp;
            }
        }
    }

    /* Drop out any periods and try the time zone table again. */
    for (period_found = false, p = q = word; (*p = *q); q++)
    {
        if (*q == '.')
        {
            period_found = true;
        }
        else
        {
            p++;
        }
    }

    if (period_found && (tp = lookup_zone(pc, word)))
    {
        return tp;
    }

    return NULL;
}

static int yylex(union YYSTYPE *lvalp, parser_control *pc)
{
    unsigned char c;
    size_t count;

    for (;;)
    {
        while (c = *pc->input, isspace(c))
        {
            pc->input++;
        }

        if (ISDIGIT(c) || c == '-' || c == '+')
        {
            char const *p;
            int sign;
            unsigned long int value;
            if (c == '-' || c == '+')
            {
                sign = c == '-' ? -1 : 1;
                while (c = *++pc->input, isspace(c))
                {
                    continue;
                }

                if (!ISDIGIT(c))
                {
                    /* skip the '-' sign */
                    continue;
                }
            }
            else
            {
                sign = 0;
            }

            p = pc->input;
            for (value = 0;; value *= 10)
            {
                unsigned long int value1 = value + (c - '0');
                if (value1 < value)
                {
                    return '?';
                }
                value = value1;
                c = *++p;
                if (!ISDIGIT(c))
                {
                    break;
                }
                if (ULONG_MAX / 10 < value)
                {
                    return '?';
                }
            }
            if ((c == '.' || c == ',') && ISDIGIT(p[1]))
            {
                time_t s;
                int ns;
                int digits;
                unsigned long int value1;

                /* Check for overflow when converting value to time_t.  */
                if (sign < 0)
                {
                    s = -value;
                    if (0 < s)
                    {
                        return '?';
                    }
                    value1 = -s;
                }
                else
                {
                    s = value;
                    if (s < 0)
                    {
                        return '?';
                    }
                    value1 = s;
                }
                if (value != value1)
                {
                    return '?';
                }

                /* Accumulate fraction, to ns precision.  */
                p++;
                ns = *p++ - '0';
                for (digits = 2; digits <= LOG10_BILLION; digits++)
                {
                    ns *= 10;
                    if (ISDIGIT(*p))
                    {
                        ns += *p++ - '0';
                    }
                }

                /* Skip excess digits, truncating toward -Infinity.  */
                if (sign < 0)
                {
                    for (; ISDIGIT(*p); p++)
                    {
                        if (*p != '0')
                        {
                            ns++;
                            break;
                        }
                    }
                }
                while (ISDIGIT(*p))
                {
                    p++;
                }

                /* Adjust to the timespec convention, which is that
                 tv_nsec is always a positive offset even if tv_sec is
                 negative.  */
                if (sign < 0 && ns)
                {
                    s--;
                    if (!(s < 0))
                    {
                        return '?';
                    }
                    ns = BILLION - ns;
                }

                lvalp->timespec.tv_sec = s;
                lvalp->timespec.tv_nsec = ns;
                pc->input = p;
                return sign ? tSDECIMAL_NUMBER : tUDECIMAL_NUMBER;
            }
            else
            {
                lvalp->textintval.negative = sign < 0;
                if (sign < 0)
                {
                    lvalp->textintval.value = -value;
                    if (0 < lvalp->textintval.value)
                    {
                        return '?';
                    }
                }
                else
                {
                    lvalp->textintval.value = value;
                    if (lvalp->textintval.value < 0)
                    {
                        return '?';
                    }
                }
                lvalp->textintval.digits = p - pc->input;
                pc->input = p;
                return sign ? tSNUMBER : tUNUMBER;
            }
        }

        if (isalpha(c))
        {
            char buff[20];
            char *p = buff;
            table const *tp;

            do
            {
                if (p < buff + sizeof buff - 1)
                {
                    *p++ = c;
                }
                c = *++pc->input;
            } while (isalpha(c) || c == '.');

            *p = '\0';
            tp = lookup_word(pc, buff);
            if (!tp)
            {
                return '?';
            }
            lvalp->intval = tp->value;
            return tp->type;
        }

        if (c != '(')
            return to_uchar(*pc->input++);

        count = 0;
        do
        {
            c = *pc->input++;
            if (c == '\0')
            {
                return c;
            }
            if (c == '(')
            {
                count++;
            }
            else if (c == ')')
            {
                count--;
            }
        } while (count != 0);
    }
}

/* Do nothing if the parser reports an error.  */
static int yyerror(parser_control const *pc, char const *s)
{
    return 0;
}

/* If *TM0 is the old and *TM1 is the new value of a struct tm after
   passing it to mktime, return true if it's OK that mktime returned T.
   It's not OK if *TM0 has out-of-range members.  */

static bool mktime_ok(struct tm const *tm0, struct tm const *tm1, time_t t)
{
    if (t == (time_t)-1)
    {
        /* Guard against falsely reporting an error when parsing a time
         stamp that happens to equal (time_t) -1, on a host that
         supports such a time stamp.  */
        tm1 = localtime(&t);
        if (!tm1)
        {
            return false;
        }
    }

    return !((tm0->tm_sec ^ tm1->tm_sec) | (tm0->tm_min ^ tm1->tm_min) | (tm0->tm_hour ^ tm1->tm_hour) | (tm0->tm_mday ^ tm1->tm_mday) | (tm0->tm_mon ^ tm1->tm_mon) | (tm0->tm_year ^ tm1->tm_year));
}

/* A reasonable upper bound for the size of ordinary TZ strings.
   Use heap allocation if TZ's length exceeds this.  */
enum
{
    TZBUFSIZE = 100
};

/* Return a copy of TZ, stored in TZBUF if it fits, and heap-allocated
   otherwise.  */
static char *get_tz(char tzbuf[TZBUFSIZE])
{
    char *tz = getenv("TZ");
    if (tz)
    {
        size_t tzsize = strlen(tz) + 1;
        tz = (tzsize <= TZBUFSIZE ? (char *)memcpy(tzbuf, tz, tzsize) : xmemdup(tz, tzsize));
    }
    return tz;
}

/* Parse a date/time string, storing the resulting time value into *RESULT.
   The string itself is pointed to by P.  Return true if successful.
   P can be an incomplete or relative time specification; if so, use
   *NOW as the basis for the returned time.  */
bool parse_datetime(struct timespec *result, char const *p, struct timespec const *now)
{
    time_t Start;
    long int Start_ns;
    struct tm const *tmp;
    struct tm tm = {
        0,
    };
    struct tm tm0 = {
        0,
    };
    parser_control pc;
    struct timespec gettime_buffer;
    unsigned char c;
    bool tz_was_altered = false;
    char *tz0 = NULL;
    char tz0buf[TZBUFSIZE];
    bool ok = true;

    if (!now)
    {
        gettime(&gettime_buffer);
        now = &gettime_buffer;
    }

    Start = now->tv_sec;
    Start_ns = now->tv_nsec;

    tmp = localtime(&now->tv_sec);
    if (!tmp)
    {
        return false;
    }

    while (c = *p, isspace(c))
    {
        p++;
    }

    if (strncmp(p, "TZ=\"", 4) == 0)
    {
        char const *tzbase = p + 4;
        size_t tzsize = 1;
        char const *s;

        for (s = tzbase; *s; s++, tzsize++)
        {
            if (*s == '\\')
            {
                s++;
                if (!(*s == '\\' || *s == '"'))
                    break;
            }
            else if (*s == '"')
            {
                char *z;
                char *tz1;
                char tz1buf[TZBUFSIZE];
                bool large_tz = TZBUFSIZE < tzsize;
                bool setenv_ok;
                tz0 = get_tz(tz0buf);
                z = tz1 = large_tz ? (char *)g_malloc(tzsize) : tz1buf;
                for (s = tzbase; *s != '"'; s++)
                    *z++ = *(s += *s == '\\');
                *z = '\0';
                setenv_ok = setenv("TZ", tz1, 1) == 0;
                if (large_tz)
                    free(tz1);
                if (!setenv_ok)
                    goto fail;
                tz_was_altered = true;

                p = s + 1;
                while (c = *p, isspace(c))
                    p++;

                break;
            }
        }
    }

    /* As documented, be careful to treat the empty string just like
     a date string of "0".  Without this, an empty string would be
     declared invalid when parsed during a DST transition.  */
    if (*p == '\0')
    {
        p = "0";
    }

    pc.input = p;
    pc.year.value = tmp->tm_year;
    pc.year.value += TM_YEAR_BASE;
    pc.year.digits = 0;
    pc.month = tmp->tm_mon + 1;
    pc.day = tmp->tm_mday;
    pc.hour = tmp->tm_hour;
    pc.minutes = tmp->tm_min;
    pc.seconds.tv_sec = tmp->tm_sec;
    pc.seconds.tv_nsec = Start_ns;
    tm.tm_isdst = tmp->tm_isdst;

    pc.meridian = MER24;
    pc.rel = RELATIVE_TIME_0;
    pc.timespec_seen = false;
    pc.rels_seen = false;
    pc.dates_seen = 0;
    pc.days_seen = 0;
    pc.times_seen = 0;
    pc.local_zones_seen = 0;
    pc.dsts_seen = 0;
    pc.zones_seen = 0;

#if HAVE_STRUCT_TM_TM_ZONE
    pc.local_time_zone_table[0].name = tmp->tm_zone;
    pc.local_time_zone_table[0].type = tLOCAL_ZONE;
    pc.local_time_zone_table[0].value = tmp->tm_isdst;
    pc.local_time_zone_table[1].name = NULL;

    /* Probe the names used in the next three calendar quarters, looking
     for a tm_isdst different from the one we already have.  */
    {
        int quarter;
        for (quarter = 1; quarter <= 3; quarter++)
        {
            time_t probe = Start + quarter * (90 * 24 * 60 * 60);
            struct tm const *probe_tm = localtime(&probe);
            if (probe_tm && probe_tm->tm_zone && probe_tm->tm_isdst != pc.local_time_zone_table[0].value)
            {
                {
                    pc.local_time_zone_table[1].name = probe_tm->tm_zone;
                    pc.local_time_zone_table[1].type = tLOCAL_ZONE;
                    pc.local_time_zone_table[1].value = probe_tm->tm_isdst;
                    pc.local_time_zone_table[2].name = NULL;
                }
                break;
            }
        }
    }
#else
#if HAVE_TZNAME
    {
#if !HAVE_DECL_TZNAME
        extern char *tzname[];
#endif
        int i;
        for (i = 0; i < 2; i++)
        {
            pc.local_time_zone_table[i].name = tzname[i];
            pc.local_time_zone_table[i].type = tLOCAL_ZONE;
            pc.local_time_zone_table[i].value = i;
        }
        pc.local_time_zone_table[i].name = NULL;
    }
#else
    pc.local_time_zone_table[0].name = NULL;
#endif
#endif

    if (pc.local_time_zone_table[0].name && pc.local_time_zone_table[1].name && !strcmp(pc.local_time_zone_table[0].name, pc.local_time_zone_table[1].name))
    {
        /* This locale uses the same abbreviation for standard and
         daylight times.  So if we see that abbreviation, we don't
         know whether it's daylight time.  */
        pc.local_time_zone_table[0].value = -1;
        pc.local_time_zone_table[1].name = NULL;
    }

    if (yyparse(&pc) != 0)
    {
        goto fail;
    }

    if (pc.timespec_seen)
        *result = pc.seconds;
    else
    {
        if (1 < (pc.times_seen | pc.dates_seen | pc.days_seen | pc.dsts_seen | (pc.local_zones_seen + pc.zones_seen)))
        {
            goto fail;
        }

        tm.tm_year = to_year(pc.year) - TM_YEAR_BASE;
        tm.tm_mon = pc.month - 1;
        tm.tm_mday = pc.day;
        if (pc.times_seen || (pc.rels_seen && !pc.dates_seen && !pc.days_seen))
        {
            tm.tm_hour = to_hour(pc.hour, pc.meridian);
            if (tm.tm_hour < 0)
            {
                goto fail;
            }
            tm.tm_min = pc.minutes;
            tm.tm_sec = pc.seconds.tv_sec;
        }
        else
        {
            tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
            pc.seconds.tv_nsec = 0;
        }

        /* Let mktime deduce tm_isdst if we have an absolute time stamp.  */
        if (pc.dates_seen | pc.days_seen | pc.times_seen)
        {
            tm.tm_isdst = -1;
        }

        /* But if the input explicitly specifies local time with or without
         DST, give mktime that information.  */
        if (pc.local_zones_seen)
        {
            tm.tm_isdst = pc.local_isdst;
        }

        tm0 = tm;

        Start = mktime(&tm);

        if (!mktime_ok(&tm0, &tm, Start))
        {
            if (!pc.zones_seen)
            {
                goto fail;
            }
            else
            {
                /* Guard against falsely reporting errors near the time_t
                 boundaries when parsing times in other time zones.  For
                 example, suppose the input string "1969-12-31 23:00:00 -0100",
                 the current time zone is 8 hours ahead of UTC, and the min
                 time_t value is 1970-01-01 00:00:00 UTC.  Then the min
                 localtime value is 1970-01-01 08:00:00, and mktime will
                 therefore fail on 1969-12-31 23:00:00.  To work around the
                 problem, set the time zone to 1 hour behind UTC temporarily
                 by setting TZ="XXX1:00" and try mktime again.  */

                long int time_zone = pc.time_zone;
                long int abs_time_zone = time_zone < 0 ? -time_zone : time_zone;
                long int abs_time_zone_hour = abs_time_zone / 60;
                int abs_time_zone_min = abs_time_zone % 60;
                char tz1buf[sizeof "XXX+0:00" + sizeof pc.time_zone * CHAR_BIT / 3];
                if (!tz_was_altered)
                {
                    tz0 = get_tz(tz0buf);
                }
                sprintf(tz1buf, "XXX%s%ld:%02d", &"-"[time_zone < 0], abs_time_zone_hour, abs_time_zone_min);
                if (setenv("TZ", tz1buf, 1) != 0)
                {
                    goto fail;
                }
                tz_was_altered = true;
                tm = tm0;
                Start = mktime(&tm);
                if (!mktime_ok(&tm0, &tm, Start))
                {
                    goto fail;
                }
            }
        }

        if (pc.days_seen && !pc.dates_seen)
        {
            tm.tm_mday += ((pc.day_number - tm.tm_wday + 7) % 7 + 7 * (pc.day_ordinal - (0 < pc.day_ordinal && tm.tm_wday != pc.day_number)));
            tm.tm_isdst = -1;
            Start = mktime(&tm);
            if (Start == (time_t)-1)
            {
                goto fail;
            }
        }

        /* Add relative date.  */
        if (pc.rel.year | pc.rel.month | pc.rel.day)
        {
            int year = tm.tm_year + pc.rel.year;
            int month = tm.tm_mon + pc.rel.month;
            int day = tm.tm_mday + pc.rel.day;
            if (((year < tm.tm_year) ^ (pc.rel.year < 0)) | ((month < tm.tm_mon) ^ (pc.rel.month < 0)) | ((day < tm.tm_mday) ^ (pc.rel.day < 0)))
            {
                goto fail;
            }
            tm.tm_year = year;
            tm.tm_mon = month;
            tm.tm_mday = day;
            tm.tm_hour = tm0.tm_hour;
            tm.tm_min = tm0.tm_min;
            tm.tm_sec = tm0.tm_sec;
            tm.tm_isdst = tm0.tm_isdst;
            Start = mktime(&tm);
            if (Start == (time_t)-1)
            {
                goto fail;
            }
        }

        /* The only "output" of this if-block is an updated Start value,
         so this block must follow others that clobber Start.  */
        if (pc.zones_seen)
        {
            long int delta = pc.time_zone * 60;
            time_t t1;
#ifdef HAVE_TM_GMTOFF
            delta -= tm.tm_gmtoff;
#else
            time_t t = Start;
            struct tm const *gmt = gmtime(&t);
            if (!gmt)
            {
                goto fail;
            }
            delta -= tm_diff(&tm, gmt);
#endif
            t1 = Start - delta;
            if ((Start < t1) != (delta < 0))
            {
                goto fail; /* time_t overflow */
            }
            Start = t1;
        }

        /* Add relative hours, minutes, and seconds.  On hosts that support
         leap seconds, ignore the possibility of leap seconds; e.g.,
         "+ 10 minutes" adds 600 seconds, even if one of them is a
         leap second.  Typically this is not what the user wants, but it's
         too hard to do it the other way, because the time zone indicator
         must be applied before relative times, and if mktime is applied
         again the time zone will be lost.  */
        {
            long int sum_ns = pc.seconds.tv_nsec + pc.rel.ns;
            long int normalized_ns = (sum_ns % BILLION + BILLION) % BILLION;
            time_t t0 = Start;
            long int d1 = 60 * 60 * pc.rel.hour;
            time_t t1 = t0 + d1;
            long int d2 = 60 * pc.rel.minutes;
            time_t t2 = t1 + d2;
            intmax_t d3 = pc.rel.seconds;
            intmax_t t3 = t2 + d3;
            long int d4 = (sum_ns - normalized_ns) / BILLION;
            intmax_t t4 = t3 + d4;
            time_t t5 = t4;

            if ((d1 / (60 * 60) ^ pc.rel.hour) | (d2 / 60 ^ pc.rel.minutes) | ((t1 < t0) ^ (d1 < 0)) | ((t2 < t1) ^ (d2 < 0)) | ((t3 < t2) ^ (d3 < 0)) | ((t4 < t3) ^ (d4 < 0)) | (t5 != t4))
            {
                goto fail;
            }

            result->tv_sec = t5;
            result->tv_nsec = normalized_ns;
        }
    }

    goto done;

fail:
    ok = false;
done:
    if (tz_was_altered)
    {
        ok &= (tz0 ? setenv("TZ", tz0, 1) : unsetenv("TZ")) == 0;
    }

    if (tz0 != tz0buf)
    {
        free(tz0);
    }
    return ok;
}
