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GETDATE.C
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C/C++ Source or Header
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1992-01-26
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39KB
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1,508 lines
# line 2 "getdate.y"
/* $Revision: 2.1 $
**
** 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 $alz
** <rsalz@bbn.com> and Jim Berets <jberets@bbn.com> in August, 1990;
** send any email to Rich.
**
** This grammar has eight shift/reduce conflicts.
**
** This code is in the public domain and has no copyright.
*/
/* SUPPRESS 287 on yaccpar_sccsid *//* Unusd static variable */
/* SUPPRESS 288 on yyerrlab *//* Label unused */
#ifdef __GNUC__
#define alloca __builtin_alloca
#else
#ifdef sparc
#include <alloca.h>
#else
#ifdef _AIX /* for Bison */
#pragma alloca
#else
char *alloca ();
#endif
#endif
#endif
#include <stdio.h>
#include <ctype.h>
#if defined(vms)
#include <types.h>
#include <time.h>
#else
#include <sys/types.h>
#if defined(USG)
/*
** Uncomment the next line if you need to do a tzset() call to set the
** timezone, and don't have ftime(). Some SystemV releases, I think.
*/
/*#define NEED_TZSET */
struct timeb {
time_t time; /* Seconds since the epoch */
unsigned short millitm; /* Field not used */
short timezone;
short dstflag; /* Field not used */
};
#else
#include <sys/timeb.h>
#endif /* defined(USG) */
#if defined(BSD4_2) || defined(BSD4_1C)
#include <sys/time.h>
#else
#include <time.h>
#endif /* defined(BSD4_2) */
#endif /* defined(vms) */
#if defined (STDC_HEADERS) || defined (USG)
#include <string.h>
#endif
extern struct tm *localtime();
#define yyparse getdate_yyparse
#define yylex getdate_yylex
#define yyerror getdate_yyerror
#if !defined(lint) && !defined(SABER)
static char RCS[] =
"$Header: str2date.y,v 2.1 90/09/06 08:15:06 cronan Exp $";
#endif /* !defined(lint) && !defined(SABER) */
#define EPOCH 1970
#define HOUR(x) (x * 60)
#define SECSPERDAY (24L * 60L * 60L)
/*
** An entry in the lexical lookup table.
*/
typedef struct _TABLE {
char *name;
int type;
time_t value;
} TABLE;
/*
** Daylight-savings mode: on, off, or not yet known.
*/
typedef enum _DSTMODE {
DSTon, DSToff, DSTmaybe
} DSTMODE;
/*
** Meridian: am, pm, or 24-hour style.
*/
typedef enum _MERIDIAN {
MERam, MERpm, MER24
} MERIDIAN;
/*
** Global variables. We could get rid of most of these by using a good
** union as the yacc stack. (This routine was originally written before
** yacc had the %union construct.) Maybe someday; right now we only use
** the %union very rarely.
*/
static char *yyInput;
static DSTMODE yyDSTmode;
static time_t yyDayOrdinal;
static time_t yyDayNumber;
static int yyHaveDate;
static int yyHaveDay;
static int yyHaveRel;
static int yyHaveTime;
static int yyHaveZone;
static time_t yyTimezone;
static time_t yyDay;
static time_t yyHour;
static time_t yyMinutes;
static time_t yyMonth;
static time_t yySeconds;
static time_t yyYear;
static MERIDIAN yyMeridian;
static time_t yyRelMonth;
static time_t yyRelSeconds;
# line 135 "getdate.y"
typedef union {
time_t Number;
enum _MERIDIAN Meridian;
} YYSTYPE;
# define tAGO 257
# define tDAY 258
# define tDAYZONE 259
# define tID 260
# define tMERIDIAN 261
# define tMINUTE_UNIT 262
# define tMONTH 263
# define tMONTH_UNIT 264
# define tSEC_UNIT 265
# define tSNUMBER 266
# define tUNUMBER 267
# define tZONE 268
#define yyclearin yychar = -1
#define yyerrok yyerrflag = 0
extern int yychar;
extern int yyerrflag;
#ifndef YYMAXDEPTH
#define YYMAXDEPTH 150
#endif
YYSTYPE yylval, yyval;
typedef int yytabelem;
# define YYERRCODE 256
# line 331 "getdate.y"
/* Month and day table. */
static TABLE MonthDayTable[] = {
{ "january", tMONTH, 1 },
{ "february", tMONTH, 2 },
{ "march", tMONTH, 3 },
{ "april", tMONTH, 4 },
{ "may", tMONTH, 5 },
{ "june", tMONTH, 6 },
{ "july", tMONTH, 7 },
{ "august", tMONTH, 8 },
{ "september", tMONTH, 9 },
{ "sept", tMONTH, 9 },
{ "october", tMONTH, 10 },
{ "november", tMONTH, 11 },
{ "december", tMONTH, 12 },
{ "sunday", tDAY, 0 },
{ "monday", tDAY, 1 },
{ "tuesday", tDAY, 2 },
{ "tues", tDAY, 2 },
{ "wednesday", tDAY, 3 },
{ "wednes", tDAY, 3 },
{ "thursday", tDAY, 4 },
{ "thur", tDAY, 4 },
{ "thurs", tDAY, 4 },
{ "friday", tDAY, 5 },
{ "saturday", tDAY, 6 },
{ NULL }
};
/* Time units table. */
static TABLE UnitsTable[] = {
{ "year", tMONTH_UNIT, 12 },
{ "month", tMONTH_UNIT, 1 },
{ "fortnight", tMINUTE_UNIT, 14 * 24 * 60 },
{ "week", tMINUTE_UNIT, 7 * 24 * 60 },
{ "day", tMINUTE_UNIT, 1 * 24 * 60 },
{ "hour", tMINUTE_UNIT, 60 },
{ "minute", tMINUTE_UNIT, 1 },
{ "min", tMINUTE_UNIT, 1 },
{ "second", tSEC_UNIT, 1 },
{ "sec", tSEC_UNIT, 1 },
{ NULL }
};
/* Assorted relative-time words. */
static TABLE OtherTable[] = {
{ "tomorrow", tMINUTE_UNIT, 1 * 24 * 60 },
{ "yesterday", tMINUTE_UNIT, -1 * 24 * 60 },
{ "today", tMINUTE_UNIT, 0 },
{ "now", tMINUTE_UNIT, 0 },
{ "last", tUNUMBER, -1 },
{ "this", tMINUTE_UNIT, 0 },
{ "next", tUNUMBER, 2 },
{ "first", tUNUMBER, 1 },
/* { "second", tUNUMBER, 2 }, */
{ "third", tUNUMBER, 3 },
{ "fourth", tUNUMBER, 4 },
{ "fifth", tUNUMBER, 5 },
{ "sixth", tUNUMBER, 6 },
{ "seventh", tUNUMBER, 7 },
{ "eighth", tUNUMBER, 8 },
{ "ninth", tUNUMBER, 9 },
{ "tenth", tUNUMBER, 10 },
{ "eleventh", tUNUMBER, 11 },
{ "twelfth", tUNUMBER, 12 },
{ "ago", tAGO, 1 },
{ NULL }
};
/* The timezone table. */
static TABLE 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
{ "nft", tZONE, HOUR(3.5) }, /* Newfoundland */
{ "nst", tZONE, HOUR(3.5) }, /* Newfoundland Standard */
{ "ndt", tDAYZONE, HOUR(3.5) }, /* Newfoundland Daylight */
{ "ast", tZONE, HOUR( 4) }, /* Atlantic Standard */
{ "adt", tDAYZONE, HOUR( 4) }, /* Atlantic Daylight */
{ "est", tZONE, HOUR( 5) }, /* Eastern Standard */
{ "edt", tDAYZONE, HOUR( 5) }, /* Eastern Daylight */
{ "cst", tZONE, HOUR( 6) }, /* Central Standard */
{ "cdt", tDAYZONE, HOUR( 6) }, /* Central Daylight */
{ "mst", tZONE, HOUR( 7) }, /* Mountain Standard */
{ "mdt", tDAYZONE, HOUR( 7) }, /* Mountain Daylight */
{ "pst", tZONE, HOUR( 8) }, /* Pacific Standard */
{ "pdt", tDAYZONE, HOUR( 8) }, /* Pacific Daylight */
{ "yst", tZONE, HOUR( 9) }, /* Yukon Standard */
{ "ydt", tDAYZONE, HOUR( 9) }, /* Yukon Daylight */
{ "hst", tZONE, HOUR(10) }, /* Hawaii Standard */
{ "hdt", tDAYZONE, HOUR(10) }, /* Hawaii Daylight */
{ "cat", tZONE, HOUR(10) }, /* Central Alaska */
{ "ahst", tZONE, HOUR(10) }, /* Alaska-Hawaii Standard */
{ "nt", tZONE, HOUR(11) }, /* Nome */
{ "idlw", tZONE, HOUR(12) }, /* International Date Line West */
{ "cet", tZONE, -HOUR(1) }, /* Central European */
{ "met", tZONE, -HOUR(1) }, /* Middle European */
{ "mewt", tZONE, -HOUR(1) }, /* Middle European Winter */
{ "mest", tDAYZONE, -HOUR(1) }, /* Middle European Summer */
{ "swt", tZONE, -HOUR(1) }, /* Swedish Winter */
{ "sst", tDAYZONE, -HOUR(1) }, /* Swedish Summer */
{ "fwt", tZONE, -HOUR(1) }, /* French Winter */
{ "