GNU tar 1.13

lib/getdate.y

@@ -0,0 +1,1049 @@
+%{
+/*
+**  Originally written by Steven M. Bellovin <smb@research.att.com> while
+**  at the University of North Carolina at Chapel Hill.  Later tweaked by
+**  a couple of people on Usenet.  Completely overhauled by Rich $alz
+**  <rsalz@bbn.com> and Jim Berets <jberets@bbn.com> in August, 1990.
+**
+**  This code is in the public domain and has no copyright.
+*/
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+# ifdef HAVE_ALLOCA_H
+#  include <alloca.h>
+# endif
+#endif
+
+/* Since the code of getdate.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 <stdio.h>
+#include <ctype.h>
+
+#if HAVE_STDLIB_H
+# include <stdlib.h> /* for `free'; used by Bison 1.27 */
+#endif
+
+#if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII))
+# define IN_CTYPE_DOMAIN(c) 1
+#else
+# define IN_CTYPE_DOMAIN(c) isascii(c)
+#endif
+
+#define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (c))
+#define ISALPHA(c) (IN_CTYPE_DOMAIN (c) && isalpha (c))
+#define ISUPPER(c) (IN_CTYPE_DOMAIN (c) && isupper (c))
+#define ISDIGIT_LOCALE(c) (IN_CTYPE_DOMAIN (c) && isdigit (c))
+
+/* ISDIGIT differs from ISDIGIT_LOCALE, as follows:
+   - Its arg may be any int or unsigned int; it need not be an unsigned char.
+   - It's guaranteed to evaluate its argument exactly once.
+   - It's typically faster.
+   Posix 1003.2-1992 section 2.5.2.1 page 50 lines 1556-1558 says that
+   only '0' through '9' are digits.  Prefer ISDIGIT to ISDIGIT_LOCALE 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) (c) - '0' <= 9)
+
+#if defined (STDC_HEADERS) || defined (USG)
+# include <string.h>
+#endif
+
+#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 7)
+# define __attribute__(x)
+#endif
+
+#ifndef ATTRIBUTE_UNUSED
+# define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
+#endif
+
+/* Some old versions of bison generate parsers that use bcopy.
+   That loses on systems that don't provide the function, so we have
+   to redefine it here.  */
+#if !defined (HAVE_BCOPY) && defined (HAVE_MEMCPY) && !defined (bcopy)
+# define bcopy(from, to, len) memcpy ((to), (from), (len))
+#endif
+
+/* Remap normal yacc parser interface names (yyparse, yylex, yyerror, etc),
+   as well as gratuitiously global symbol names, so we can have multiple
+   yacc generated parsers in the same program.  Note that these are only
+   the variables produced by yacc.  If other parser generators (bison,
+   byacc, etc) produce additional global names that conflict at link time,
+   then those parser generators need to be fixed instead of adding those
+   names to this list. */
+
+#define yymaxdepth gd_maxdepth
+#define yyparse gd_parse
+#define yylex   gd_lex
+#define yyerror gd_error
+#define yylval  gd_lval
+#define yychar  gd_char
+#define yydebug gd_debug
+#define yypact  gd_pact
+#define yyr1    gd_r1
+#define yyr2    gd_r2
+#define yydef   gd_def
+#define yychk   gd_chk
+#define yypgo   gd_pgo
+#define yyact   gd_act
+#define yyexca  gd_exca
+#define yyerrflag gd_errflag
+#define yynerrs gd_nerrs
+#define yyps    gd_ps
+#define yypv    gd_pv
+#define yys     gd_s
+#define yy_yys  gd_yys
+#define yystate gd_state
+#define yytmp   gd_tmp
+#define yyv     gd_v
+#define yy_yyv  gd_yyv
+#define yyval   gd_val
+#define yylloc  gd_lloc
+#define yyreds  gd_reds          /* With YYDEBUG defined */
+#define yytoks  gd_toks          /* With YYDEBUG defined */
+#define yylhs   gd_yylhs
+#define yylen   gd_yylen
+#define yydefred gd_yydefred
+#define yydgoto gd_yydgoto
+#define yysindex gd_yysindex
+#define yyrindex gd_yyrindex
+#define yygindex gd_yygindex
+#define yytable  gd_yytable
+#define yycheck  gd_yycheck
+
+static int yylex ();
+static int yyerror ();
+
+#define EPOCH		1970
+#define HOUR(x)		((x) * 60)
+
+#define MAX_BUFF_LEN    128   /* size of buffer to read the date into */
+
+/*
+**  An entry in the lexical lookup table.
+*/
+typedef struct _TABLE {
+    const char	*name;
+    int		type;
+    int		value;
+} TABLE;
+
+
+/*
+**  Meridian:  am, pm, or 24-hour style.
+*/
+typedef enum _MERIDIAN {
+    MERam, MERpm, MER24
+} MERIDIAN;
+
+
+/*
+**  Global variables.  We could get rid of most of these by using a good
+**  union as the yacc stack.  (This routine was originally written before
+**  yacc had the %union construct.)  Maybe someday; right now we only use
+**  the %union very rarely.
+*/
+static const char	*yyInput;
+static int	yyDayOrdinal;
+static int	yyDayNumber;
+static int	yyHaveDate;
+static int	yyHaveDay;
+static int	yyHaveRel;
+static int	yyHaveTime;
+static int	yyHaveZone;
+static int	yyTimezone;
+static int	yyDay;
+static int	yyHour;
+static int	yyMinutes;
+static int	yyMonth;
+static int	yySeconds;
+static int	yyYear;
+static MERIDIAN	yyMeridian;
+static int	yyRelDay;
+static int	yyRelHour;
+static int	yyRelMinutes;
+static int	yyRelMonth;
+static int	yyRelSeconds;
+static int	yyRelYear;
+
+%}
+
+/* This grammar has 13 shift/reduce conflicts. */
+%expect 13
+
+%union {
+    int			Number;
+    enum _MERIDIAN	Meridian;
+}
+
+%token	tAGO tDAY tDAY_UNIT tDAYZONE tDST tHOUR_UNIT tID
+%token	tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT
+%token	tSEC_UNIT tSNUMBER tUNUMBER tYEAR_UNIT tZONE
+
+%type	<Number>	tDAY tDAY_UNIT tDAYZONE tHOUR_UNIT tMINUTE_UNIT
+%type	<Number>	tMONTH tMONTH_UNIT
+%type	<Number>	tSEC_UNIT tSNUMBER tUNUMBER tYEAR_UNIT tZONE
+%type	<Meridian>	tMERIDIAN o_merid
+
+%%
+
+spec	: /* NULL */
+	| spec item
+	;
+
+item	: time {
+	    yyHaveTime++;
+	}
+	| zone {
+	    yyHaveZone++;
+	}
+	| date {
+	    yyHaveDate++;
+	}
+	| day {
+	    yyHaveDay++;
+	}
+	| rel {
+	    yyHaveRel++;
+	}
+	| number
+	;
+
+time	: tUNUMBER tMERIDIAN {
+	    yyHour = $1;
+	    yyMinutes = 0;
+	    yySeconds = 0;
+	    yyMeridian = $2;
+	}
+	| tUNUMBER ':' tUNUMBER o_merid {
+	    yyHour = $1;
+	    yyMinutes = $3;
+	    yySeconds = 0;
+	    yyMeridian = $4;
+	}
+	| tUNUMBER ':' tUNUMBER tSNUMBER {
+	    yyHour = $1;
+	    yyMinutes = $3;
+	    yyMeridian = MER24;
+	    yyHaveZone++;
+	    yyTimezone = ($4 < 0
+			  ? -$4 % 100 + (-$4 / 100) * 60
+			  : - ($4 % 100 + ($4 / 100) * 60));
+	}
+	| tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid {
+	    yyHour = $1;
+	    yyMinutes = $3;
+	    yySeconds = $5;
+	    yyMeridian = $6;
+	}
+	| tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER {
+	    yyHour = $1;
+	    yyMinutes = $3;
+	    yySeconds = $5;
+	    yyMeridian = MER24;
+	    yyHaveZone++;
+	    yyTimezone = ($6 < 0
+			  ? -$6 % 100 + (-$6 / 100) * 60
+			  : - ($6 % 100 + ($6 / 100) * 60));
+	}
+	;
+
+zone	: tZONE {
+	    yyTimezone = $1;
+	}
+	| tDAYZONE {
+	    yyTimezone = $1 - 60;
+	}
+	|
+	  tZONE tDST {
+	    yyTimezone = $1 - 60;
+	}
+	;
+
+day	: tDAY {
+	    yyDayOrdinal = 1;
+	    yyDayNumber = $1;
+	}
+	| tDAY ',' {
+	    yyDayOrdinal = 1;
+	    yyDayNumber = $1;
+	}
+	| tUNUMBER tDAY {
+	    yyDayOrdinal = $1;
+	    yyDayNumber = $2;
+	}
+	;
+
+date	: tUNUMBER '/' tUNUMBER {
+	    yyMonth = $1;
+	    yyDay = $3;
+	}
+	| tUNUMBER '/' tUNUMBER '/' tUNUMBER {
+	  /* Interpret as YYYY/MM/DD if $1 >= 1000, 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 ($1 >= 1000)
+	    {
+	      yyYear = $1;
+	      yyMonth = $3;
+	      yyDay = $5;
+	    }
+	  else
+	    {
+	      yyMonth = $1;
+	      yyDay = $3;
+	      yyYear = $5;
+	    }
+	}
+	| tUNUMBER tSNUMBER tSNUMBER {
+	    /* ISO 8601 format.  yyyy-mm-dd.  */
+	    yyYear = $1;
+	    yyMonth = -$2;
+	    yyDay = -$3;
+	}
+	| tUNUMBER tMONTH tSNUMBER {
+	    /* e.g. 17-JUN-1992.  */
+	    yyDay = $1;
+	    yyMonth = $2;
+	    yyYear = -$3;
+	}
+	| tMONTH tUNUMBER {
+	    yyMonth = $1;
+	    yyDay = $2;
+	}
+	| tMONTH tUNUMBER ',' tUNUMBER {
+	    yyMonth = $1;
+	    yyDay = $2;
+	    yyYear = $4;
+	}
+	| tUNUMBER tMONTH {
+	    yyMonth = $2;
+	    yyDay = $1;
+	}
+	| tUNUMBER tMONTH tUNUMBER {
+	    yyMonth = $2;
+	    yyDay = $1;
+	    yyYear = $3;
+	}
+	;
+
+rel	: relunit tAGO {
+	    yyRelSeconds = -yyRelSeconds;
+	    yyRelMinutes = -yyRelMinutes;
+	    yyRelHour = -yyRelHour;
+	    yyRelDay = -yyRelDay;
+	    yyRelMonth = -yyRelMonth;
+	    yyRelYear = -yyRelYear;
+	}
+	| relunit
+	;
+
+relunit	: tUNUMBER tYEAR_UNIT {
+	    yyRelYear += $1 * $2;
+	}
+	| tSNUMBER tYEAR_UNIT {
+	    yyRelYear += $1 * $2;
+	}
+	| tYEAR_UNIT {
+	    yyRelYear += $1;
+	}
+	| tUNUMBER tMONTH_UNIT {
+	    yyRelMonth += $1 * $2;
+	}
+	| tSNUMBER tMONTH_UNIT {
+	    yyRelMonth += $1 * $2;
+	}
+	| tMONTH_UNIT {
+	    yyRelMonth += $1;
+	}
+	| tUNUMBER tDAY_UNIT {
+	    yyRelDay += $1 * $2;
+	}
+	| tSNUMBER tDAY_UNIT {
+	    yyRelDay += $1 * $2;
+	}
+	| tDAY_UNIT {
+	    yyRelDay += $1;
+	}
+	| tUNUMBER tHOUR_UNIT {
+	    yyRelHour += $1 * $2;
+	}
+	| tSNUMBER tHOUR_UNIT {
+	    yyRelHour += $1 * $2;
+	}
+	| tHOUR_UNIT {
+	    yyRelHour += $1;
+	}
+	| tUNUMBER tMINUTE_UNIT {
+	    yyRelMinutes += $1 * $2;
+	}
+	| tSNUMBER tMINUTE_UNIT {
+	    yyRelMinutes += $1 * $2;
+	}
+	| tMINUTE_UNIT {
+	    yyRelMinutes += $1;
+	}
+	| tUNUMBER tSEC_UNIT {
+	    yyRelSeconds += $1 * $2;
+	}
+	| tSNUMBER tSEC_UNIT {
+	    yyRelSeconds += $1 * $2;
+	}
+	| tSEC_UNIT {
+	    yyRelSeconds += $1;
+	}
+	;
+
+number	: tUNUMBER
+          {
+	    if (yyHaveTime && yyHaveDate && !yyHaveRel)
+	      yyYear = $1;
+	    else
+	      {
+		if ($1>10000)
+		  {
+		    yyHaveDate++;
+		    yyDay= ($1)%100;
+		    yyMonth= ($1/100)%100;
+		    yyYear = $1/10000;
+		  }
+		else
+		  {
+		    yyHaveTime++;
+		    if ($1 < 100)
+		      {
+			yyHour = $1;
+			yyMinutes = 0;
+		      }
+		    else
+		      {
+		    	yyHour = $1 / 100;
+		    	yyMinutes = $1 % 100;
+		      }
+		    yySeconds = 0;
+		    yyMeridian = MER24;
+		  }
+	      }
+	  }
+	;
+
+o_merid	: /* NULL */
+	  {
+	    $$ = MER24;
+	  }
+	| tMERIDIAN
+	  {
+	    $$ = $1;
+	  }
+	;
+
+%%
+
+/* Include this file down here because bison inserts code above which
+   may define-away `const'.  We want the prototype for get_date to have
+   the same signature as the function definition does. */
+#include "getdate.h"
+
+extern struct tm	*gmtime ();
+extern struct tm	*localtime ();
+extern time_t		mktime ();
+
+/* Month and day table. */
+static TABLE const MonthDayTable[] = {
+    { "january",	tMONTH,  1 },
+    { "february",	tMONTH,  2 },
+    { "march",		tMONTH,  3 },
+    { "april",		tMONTH,  4 },
+    { "may",		tMONTH,  5 },
+    { "june",		tMONTH,  6 },
+    { "july",		tMONTH,  7 },
+    { "august",		tMONTH,  8 },
+    { "september",	tMONTH,  9 },
+    { "sept",		tMONTH,  9 },
+    { "october",	tMONTH, 10 },
+    { "november",	tMONTH, 11 },
+    { "december",	tMONTH, 12 },
+    { "sunday",		tDAY, 0 },
+    { "monday",		tDAY, 1 },
+    { "tuesday",	tDAY, 2 },
+    { "tues",		tDAY, 2 },
+    { "wednesday",	tDAY, 3 },
+    { "wednes",		tDAY, 3 },
+    { "thursday",	tDAY, 4 },
+    { "thur",		tDAY, 4 },
+    { "thurs",		tDAY, 4 },
+    { "friday",		tDAY, 5 },
+    { "saturday",	tDAY, 6 },
+    { NULL, 0, 0 }
+};
+
+/* Time units table. */
+static TABLE const UnitsTable[] = {
+    { "year",		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 OtherTable[] = {
+    { "tomorrow",	tMINUTE_UNIT,	1 * 24 * 60 },
+    { "yesterday",	tMINUTE_UNIT,	-1 * 24 * 60 },
+    { "today",		tMINUTE_UNIT,	0 },
+    { "now",		tMINUTE_UNIT,	0 },
+    { "last",		tUNUMBER,	-1 },
+    { "this",		tMINUTE_UNIT,	0 },
+    { "next",		tUNUMBER,	1 },
+    { "first",		tUNUMBER,	1 },
+/*  { "second",		tUNUMBER,	2 }, */
+    { "third",		tUNUMBER,	3 },
+    { "fourth",		tUNUMBER,	4 },
+    { "fifth",		tUNUMBER,	5 },
+    { "sixth",		tUNUMBER,	6 },
+    { "seventh",	tUNUMBER,	7 },
+    { "eighth",		tUNUMBER,	8 },
+    { "ninth",		tUNUMBER,	9 },
+    { "tenth",		tUNUMBER,	10 },
+    { "eleventh",	tUNUMBER,	11 },
+    { "twelfth",	tUNUMBER,	12 },
+    { "ago",		tAGO,	1 },
+    { NULL, 0, 0 }
+};
+
+/* The timezone table. */
+static TABLE const TimezoneTable[] = {
+    { "gmt",	tZONE,     HOUR ( 0) },	/* Greenwich Mean */
+    { "ut",	tZONE,     HOUR ( 0) },	/* Universal (Coordinated) */
+    { "utc",	tZONE,     HOUR ( 0) },
+    { "wet",	tZONE,     HOUR ( 0) },	/* Western European */
+    { "bst",	tDAYZONE,  HOUR ( 0) },	/* British Summer */
+    { "wat",	tZONE,     HOUR ( 1) },	/* West Africa */
+    { "at",	tZONE,     HOUR ( 2) },	/* Azores */
+#if	0
+    /* For completeness.  BST is also British Summer, and GST is
+     * also Guam Standard. */
+    { "bst",	tZONE,     HOUR ( 3) },	/* Brazil Standard */
+    { "gst",	tZONE,     HOUR ( 3) },	/* Greenland Standard */
+#endif
+#if 0
+    { "nft",	tZONE,     HOUR (3.5) },	/* Newfoundland */
+    { "nst",	tZONE,     HOUR (3.5) },	/* Newfoundland Standard */
+    { "ndt",	tDAYZONE,  HOUR (3.5) },	/* Newfoundland Daylight */
+#endif
+    { "ast",	tZONE,     HOUR ( 4) },	/* Atlantic Standard */
+    { "adt",	tDAYZONE,  HOUR ( 4) },	/* Atlantic Daylight */
+    { "est",	tZONE,     HOUR ( 5) },	/* Eastern Standard */
+    { "edt",	tDAYZONE,  HOUR ( 5) },	/* Eastern Daylight */
+    { "cst",	tZONE,     HOUR ( 6) },	/* Central Standard */
+    { "cdt",	tDAYZONE,  HOUR ( 6) },	/* Central Daylight */
+    { "mst",	tZONE,     HOUR ( 7) },	/* Mountain Standard */
+    { "mdt",	tDAYZONE,  HOUR ( 7) },	/* Mountain Daylight */
+    { "pst",	tZONE,     HOUR ( 8) },	/* Pacific Standard */
+    { "pdt",	tDAYZONE,  HOUR ( 8) },	/* Pacific Daylight */
+    { "yst",	tZONE,     HOUR ( 9) },	/* Yukon Standard */
+    { "ydt",	tDAYZONE,  HOUR ( 9) },	/* Yukon Daylight */
+    { "hst",	tZONE,     HOUR (10) },	/* Hawaii Standard */
+    { "hdt",	tDAYZONE,  HOUR (10) },	/* Hawaii Daylight */
+    { "cat",	tZONE,     HOUR (10) },	/* Central Alaska */
+    { "ahst",	tZONE,     HOUR (10) },	/* Alaska-Hawaii Standard */
+    { "nt",	tZONE,     HOUR (11) },	/* Nome */
+    { "idlw",	tZONE,     HOUR (12) },	/* International Date Line West */
+    { "cet",	tZONE,     -HOUR (1) },	/* Central European */
+    { "met",	tZONE,     -HOUR (1) },	/* Middle European */
+    { "mewt",	tZONE,     -HOUR (1) },	/* Middle European Winter */
+    { "mest",	tDAYZONE,  -HOUR (1) },	/* Middle European Summer */
+    { "mesz",	tDAYZONE,  -HOUR (1) },	/* Middle European Summer */
+    { "swt",	tZONE,     -HOUR (1) },	/* Swedish Winter */
+    { "sst",	tDAYZONE,  -HOUR (1) },	/* Swedish Summer */
+    { "fwt",	tZONE,     -HOUR (1) },	/* French Winter */
+    { "fst",	tDAYZONE,  -HOUR (1) },	/* French Summer */
+    { "eet",	tZONE,     -HOUR (2) },	/* Eastern Europe, USSR Zone 1 */
+    { "bt",	tZONE,     -HOUR (3) },	/* Baghdad, USSR Zone 2 */
+#if 0
+    { "it",	tZONE,     -HOUR (3.5) },/* Iran */
+#endif
+    { "zp4",	tZONE,     -HOUR (4) },	/* USSR Zone 3 */
+    { "zp5",	tZONE,     -HOUR (5) },	/* USSR Zone 4 */
+#if 0
+    { "ist",	tZONE,     -HOUR (5.5) },/* Indian Standard */
+#endif
+    { "zp6",	tZONE,     -HOUR (6) },	/* USSR Zone 5 */
+#if	0
+    /* For completeness.  NST is also Newfoundland Standard, and SST is
+     * also Swedish Summer. */
+    { "nst",	tZONE,     -HOUR (6.5) },/* North Sumatra */
+    { "sst",	tZONE,     -HOUR (7) },	/* South Sumatra, USSR Zone 6 */
+#endif	/* 0 */
+    { "wast",	tZONE,     -HOUR (7) },	/* West Australian Standard */
+    { "wadt",	tDAYZONE,  -HOUR (7) },	/* West Australian Daylight */
+#if 0
+    { "jt",	tZONE,     -HOUR (7.5) },/* Java (3pm in Cronusland!) */
+#endif
+    { "cct",	tZONE,     -HOUR (8) },	/* China Coast, USSR Zone 7 */
+    { "jst",	tZONE,     -HOUR (9) },	/* Japan Standard, USSR Zone 8 */
+#if 0
+    { "cast",	tZONE,     -HOUR (9.5) },/* Central Australian Standard */
+    { "cadt",	tDAYZONE,  -HOUR (9.5) },/* Central Australian Daylight */
+#endif
+    { "east",	tZONE,     -HOUR (10) },	/* Eastern Australian Standard */
+    { "eadt",	tDAYZONE,  -HOUR (10) },	/* Eastern Australian Daylight */
+    { "gst",	tZONE,     -HOUR (10) },	/* Guam Standard, USSR Zone 9 */
+    { "nzt",	tZONE,     -HOUR (12) },	/* New Zealand */
+    { "nzst",	tZONE,     -HOUR (12) },	/* New Zealand Standard */
+    { "nzdt",	tDAYZONE,  -HOUR (12) },	/* New Zealand Daylight */
+    { "idle",	tZONE,     -HOUR (12) },	/* International Date Line East */
+    {  NULL, 0, 0  }
+};
+
+/* Military timezone table. */
+static TABLE const MilitaryTable[] = {
+    { "a",	tZONE,	HOUR (  1) },
+    { "b",	tZONE,	HOUR (  2) },
+    { "c",	tZONE,	HOUR (  3) },
+    { "d",	tZONE,	HOUR (  4) },
+    { "e",	tZONE,	HOUR (  5) },
+    { "f",	tZONE,	HOUR (  6) },
+    { "g",	tZONE,	HOUR (  7) },
+    { "h",	tZONE,	HOUR (  8) },
+    { "i",	tZONE,	HOUR (  9) },
+    { "k",	tZONE,	HOUR ( 10) },
+    { "l",	tZONE,	HOUR ( 11) },
+    { "m",	tZONE,	HOUR ( 12) },
+    { "n",	tZONE,	HOUR (- 1) },
+    { "o",	tZONE,	HOUR (- 2) },
+    { "p",	tZONE,	HOUR (- 3) },
+    { "q",	tZONE,	HOUR (- 4) },
+    { "r",	tZONE,	HOUR (- 5) },
+    { "s",	tZONE,	HOUR (- 6) },
+    { "t",	tZONE,	HOUR (- 7) },
+    { "u",	tZONE,	HOUR (- 8) },
+    { "v",	tZONE,	HOUR (- 9) },
+    { "w",	tZONE,	HOUR (-10) },
+    { "x",	tZONE,	HOUR (-11) },
+    { "y",	tZONE,	HOUR (-12) },
+    { "z",	tZONE,	HOUR (  0) },
+    { NULL, 0, 0 }
+};
+
+
+
+
+/* ARGSUSED */
+static int
+yyerror (s)
+     char *s ATTRIBUTE_UNUSED;
+{
+  return 0;
+}
+
+static int
+ToHour (Hours, Meridian)
+     int Hours;
+     MERIDIAN Meridian;
+{
+  switch (Meridian)
+    {
+    case MER24:
+      if (Hours < 0 || Hours > 23)
+	return -1;
+      return Hours;
+    case MERam:
+      if (Hours < 1 || Hours > 12)
+	return -1;
+      if (Hours == 12)
+	Hours = 0;
+      return Hours;
+    case MERpm:
+      if (Hours < 1 || Hours > 12)
+	return -1;
+      if (Hours == 12)
+	Hours = 0;
+      return Hours + 12;
+    default:
+      abort ();
+    }
+  /* NOTREACHED */
+}
+
+static int
+ToYear (Year)
+     int Year;
+{
+  if (Year < 0)
+    Year = -Year;
+
+  /* XPG4 suggests that years 00-68 map to 2000-2068, and
+     years 69-99 map to 1969-1999.  */
+  if (Year < 69)
+    Year += 2000;
+  else if (Year < 100)
+    Year += 1900;
+
+  return Year;
+}
+
+static int
+LookupWord (buff)
+     char *buff;
+{
+  register char *p;
+  register char *q;
+  register const TABLE *tp;
+  int i;
+  int abbrev;
+
+  /* Make it lowercase. */
+  for (p = buff; *p; p++)
+    if (ISUPPER ((unsigned char) *p))
+      *p = tolower (*p);
+
+  if (strcmp (buff, "am") == 0 || strcmp (buff, "a.m.") == 0)
+    {
+      yylval.Meridian = MERam;
+      return tMERIDIAN;
+    }
+  if (strcmp (buff, "pm") == 0 || strcmp (buff, "p.m.") == 0)
+    {
+      yylval.Meridian = MERpm;
+      return tMERIDIAN;
+    }
+
+  /* See if we have an abbreviation for a month. */
+  if (strlen (buff) == 3)
+    abbrev = 1;
+  else if (strlen (buff) == 4 && buff[3] == '.')
+    {
+      abbrev = 1;
+      buff[3] = '\0';
+    }
+  else
+    abbrev = 0;
+
+  for (tp = MonthDayTable; tp->name; tp++)
+    {
+      if (abbrev)
+	{
+	  if (strncmp (buff, tp->name, 3) == 0)
+	    {
+	      yylval.Number = tp->value;
+	      return tp->type;
+	    }
+	}
+      else if (strcmp (buff, tp->name) == 0)
+	{
+	  yylval.Number = tp->value;
+	  return tp->type;
+	}
+    }
+
+  for (tp = TimezoneTable; tp->name; tp++)
+    if (strcmp (buff, tp->name) == 0)
+      {
+	yylval.Number = tp->value;
+	return tp->type;
+      }
+
+  if (strcmp (buff, "dst") == 0)
+    return tDST;
+
+  for (tp = UnitsTable; tp->name; tp++)
+    if (strcmp (buff, tp->name) == 0)
+      {
+	yylval.Number = tp->value;
+	return tp->type;
+      }
+
+  /* Strip off any plural and try the units table again. */
+  i = strlen (buff) - 1;
+  if (buff[i] == 's')
+    {
+      buff[i] = '\0';
+      for (tp = UnitsTable; tp->name; tp++)
+	if (strcmp (buff, tp->name) == 0)
+	  {
+	    yylval.Number = tp->value;
+	    return tp->type;
+	  }
+      buff[i] = 's';		/* Put back for "this" in OtherTable. */
+    }
+
+  for (tp = OtherTable; tp->name; tp++)
+    if (strcmp (buff, tp->name) == 0)
+      {
+	yylval.Number = tp->value;
+	return tp->type;
+      }
+
+  /* Military timezones. */
+  if (buff[1] == '\0' && ISALPHA ((unsigned char) *buff))
+    {
+      for (tp = MilitaryTable; tp->name; tp++)
+	if (strcmp (buff, tp->name) == 0)
+	  {
+	    yylval.Number = tp->value;
+	    return tp->type;
+	  }
+    }
+
+  /* Drop out any periods and try the timezone table again. */
+  for (i = 0, p = q = buff; *q; q++)
+    if (*q != '.')
+      *p++ = *q;
+    else
+      i++;
+  *p = '\0';
+  if (i)
+    for (tp = TimezoneTable; tp->name; tp++)
+      if (strcmp (buff, tp->name) == 0)
+	{
+	  yylval.Number = tp->value;
+	  return tp->type;
+	}
+
+  return tID;
+}
+
+static int
+yylex ()
+{
+  register unsigned char c;
+  register char *p;
+  char buff[20];
+  int Count;
+  int sign;
+
+  for (;;)
+    {
+      while (ISSPACE ((unsigned char) *yyInput))
+	yyInput++;
+
+      if (ISDIGIT (c = *yyInput) || c == '-' || c == '+')
+	{
+	  if (c == '-' || c == '+')
+	    {
+	      sign = c == '-' ? -1 : 1;
+	      if (!ISDIGIT (*++yyInput))
+		/* skip the '-' sign */
+		continue;
+	    }
+	  else
+	    sign = 0;
+	  for (yylval.Number = 0; ISDIGIT (c = *yyInput++);)
+	    yylval.Number = 10 * yylval.Number + c - '0';
+	  yyInput--;
+	  if (sign < 0)
+	    yylval.Number = -yylval.Number;
+	  return sign ? tSNUMBER : tUNUMBER;
+	}
+      if (ISALPHA (c))
+	{
+	  for (p = buff; (c = *yyInput++, ISALPHA (c)) || c == '.';)
+	    if (p < &buff[sizeof buff - 1])
+	      *p++ = c;
+	  *p = '\0';
+	  yyInput--;
+	  return LookupWord (buff);
+	}
+      if (c != '(')
+	return *yyInput++;
+      Count = 0;
+      do
+	{
+	  c = *yyInput++;
+	  if (c == '\0')
+	    return c;
+	  if (c == '(')
+	    Count++;
+	  else if (c == ')')
+	    Count--;
+	}
+      while (Count > 0);
+    }
+}
+
+#define TM_YEAR_ORIGIN 1900
+
+/* Yield A - B, measured in seconds.  */
+static long
+difftm (struct tm *a, struct tm *b)
+{
+  int ay = a->tm_year + (TM_YEAR_ORIGIN - 1);
+  int by = b->tm_year + (TM_YEAR_ORIGIN - 1);
+  long days = (
+  /* difference in day of year */
+		a->tm_yday - b->tm_yday
+  /* + intervening leap days */
+		+ ((ay >> 2) - (by >> 2))
+		- (ay / 100 - by / 100)
+		+ ((ay / 100 >> 2) - (by / 100 >> 2))
+  /* + difference in years * 365 */
+		+ (long) (ay - by) * 365
+  );
+  return (60 * (60 * (24 * days + (a->tm_hour - b->tm_hour))
+		+ (a->tm_min - b->tm_min))
+	  + (a->tm_sec - b->tm_sec));
+}
+
+time_t
+get_date (const char *p, const time_t *now)
+{
+  struct tm tm, tm0, *tmp;
+  time_t Start;
+
+  yyInput = p;
+  Start = now ? *now : time ((time_t *) NULL);
+  tmp = localtime (&Start);
+  if (!tmp)
+    return -1;
+  yyYear = tmp->tm_year + TM_YEAR_ORIGIN;
+  yyMonth = tmp->tm_mon + 1;
+  yyDay = tmp->tm_mday;
+  yyHour = tmp->tm_hour;
+  yyMinutes = tmp->tm_min;
+  yySeconds = tmp->tm_sec;
+  tm.tm_isdst = tmp->tm_isdst;
+  yyMeridian = MER24;
+  yyRelSeconds = 0;
+  yyRelMinutes = 0;
+  yyRelHour = 0;
+  yyRelDay = 0;
+  yyRelMonth = 0;
+  yyRelYear = 0;
+  yyHaveDate = 0;
+  yyHaveDay = 0;
+  yyHaveRel = 0;
+  yyHaveTime = 0;
+  yyHaveZone = 0;
+
+  if (yyparse ()
+      || yyHaveTime > 1 || yyHaveZone > 1 || yyHaveDate > 1 || yyHaveDay > 1)
+    return -1;
+
+  tm.tm_year = ToYear (yyYear) - TM_YEAR_ORIGIN + yyRelYear;
+  tm.tm_mon = yyMonth - 1 + yyRelMonth;
+  tm.tm_mday = yyDay + yyRelDay;
+  if (yyHaveTime || (yyHaveRel && !yyHaveDate && !yyHaveDay))
+    {
+      tm.tm_hour = ToHour (yyHour, yyMeridian);
+      if (tm.tm_hour < 0)
+	return -1;
+      tm.tm_min = yyMinutes;
+      tm.tm_sec = yySeconds;
+    }
+  else
+    {
+      tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
+    }
+  tm.tm_hour += yyRelHour;
+  tm.tm_min += yyRelMinutes;
+  tm.tm_sec += yyRelSeconds;
+
+  /* Let mktime deduce tm_isdst if we have an absolute timestamp,
+     or if the relative timestamp mentions days, months, or years.  */
+  if (yyHaveDate | yyHaveDay | yyHaveTime | yyRelDay | yyRelMonth | yyRelYear)
+    tm.tm_isdst = -1;
+
+  tm0 = tm;
+
+  Start = mktime (&tm);
+
+  if (Start == (time_t) -1)
+    {
+
+      /* Guard against falsely reporting errors near the time_t boundaries
+         when parsing times in other time zones.  For example, if the min
+         time_t value is 1970-01-01 00:00:00 UTC and we are 8 hours ahead
+         of UTC, then the min localtime value is 1970-01-01 08:00:00; if
+         we apply mktime to 1970-01-01 00:00:00 we will get an error, so
+         we apply mktime to 1970-01-02 08:00:00 instead and adjust the time
+         zone by 24 hours to compensate.  This algorithm assumes that
+         there is no DST transition within a day of the time_t boundaries.  */
+      if (yyHaveZone)
+	{
+	  tm = tm0;
+	  if (tm.tm_year <= EPOCH - TM_YEAR_ORIGIN)
+	    {
+	      tm.tm_mday++;
+	      yyTimezone -= 24 * 60;
+	    }
+	  else
+	    {
+	      tm.tm_mday--;
+	      yyTimezone += 24 * 60;
+	    }
+	  Start = mktime (&tm);
+	}
+
+      if (Start == (time_t) -1)
+	return Start;
+    }
+
+  if (yyHaveDay && !yyHaveDate)
+    {
+      tm.tm_mday += ((yyDayNumber - tm.tm_wday + 7) % 7
+		     + 7 * (yyDayOrdinal - (0 < yyDayOrdinal)));
+      Start = mktime (&tm);
+      if (Start == (time_t) -1)
+	return Start;
+    }
+
+  if (yyHaveZone)
+    {
+      long delta;
+      struct tm *gmt = gmtime (&Start);
+      if (!gmt)
+	return -1;
+      delta = yyTimezone * 60L + difftm (&tm, gmt);
+      if ((Start + delta < Start) != (delta < 0))
+	return -1;		/* time_t overflow */
+      Start += delta;
+    }
+
+  return Start;
+}
+
+#if	defined (TEST)
+
+/* ARGSUSED */
+int
+main (ac, av)
+     int ac;
+     char *av[];
+{
+  char buff[MAX_BUFF_LEN + 1];
+  time_t d;
+
+  (void) printf ("Enter date, or blank line to exit.\n\t> ");
+  (void) fflush (stdout);
+
+  buff[MAX_BUFF_LEN] = 0;
+  while (fgets (buff, MAX_BUFF_LEN, stdin) && buff[0])
+    {
+      d = get_date (buff, (time_t *) NULL);
+      if (d == -1)
+	(void) printf ("Bad format - couldn't convert.\n");
+      else
+	(void) printf ("%s", ctime (&d));
+      (void) printf ("\t> ");
+      (void) fflush (stdout);
+    }
+  exit (0);
+  /* NOTREACHED */
+}
+#endif /* defined (TEST) */