tclGetDate.y
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- /*
- * tclGetDate.y --
- *
- * Contains yacc grammar for parsing date and time strings.
- * The output of this file should be the file tclDate.c which
- * is used directly in the Tcl sources.
- *
- * Copyright (c) 1992-1995 Karl Lehenbauer and Mark Diekhans.
- * Copyright (c) 1995-1997 Sun Microsystems, Inc.
- *
- * See the file "license.terms" for information on usage and redistribution
- * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
- *
- * RCS: @(#) $Id: tclGetDate.y,v 1.18.4.2 2005/11/04 20:15:09 kennykb Exp $
- */
- %{
- /*
- * tclDate.c --
- *
- * This file is generated from a yacc grammar defined in
- * the file tclGetDate.y. It should not be edited directly.
- *
- * Copyright (c) 1992-1995 Karl Lehenbauer and Mark Diekhans.
- * Copyright (c) 1995-1997 Sun Microsystems, Inc.
- *
- * See the file "license.terms" for information on usage and redistribution
- * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
- *
- * SCCSID
- */
- #include "tclInt.h"
- #include "tclPort.h"
- #if defined(MAC_TCL) && !defined(TCL_MAC_USE_MSL_EPOCH)
- # define EPOCH 1904
- # define START_OF_TIME 1904
- # define END_OF_TIME 2039
- #else
- # define EPOCH 1970
- # define START_OF_TIME 1902
- # define END_OF_TIME 2037
- #endif
- /*
- * The offset of tm_year of struct tm returned by localtime, gmtime, etc.
- * I don't know how universal this is; K&R II, the NetBSD manpages, and
- * ../compat/strftime.c all agree that tm_year is the year-1900. However,
- * some systems may have a different value. This #define should be the
- * same as in ../compat/strftime.c.
- */
- #define TM_YEAR_BASE 1900
- #define HOUR(x) ((int) (60 * x))
- #define SECSPERDAY (24L * 60L * 60L)
- #define IsLeapYear(x) ((x % 4 == 0) && (x % 100 != 0 || x % 400 == 0))
- /*
- * 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 time_t yyMonthOrdinal;
- static int yyHaveDate;
- static int yyHaveDay;
- static int yyHaveOrdinalMonth;
- 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 yyRelDay;
- static time_t yyRelSeconds;
- static time_t *yyRelPointer;
- /*
- * Prototypes of internal functions.
- */
- static void yyerror _ANSI_ARGS_((char *s));
- static time_t ToSeconds _ANSI_ARGS_((time_t Hours, time_t Minutes,
- time_t Seconds, MERIDIAN Meridian));
- static int Convert _ANSI_ARGS_((time_t Month, time_t Day, time_t Year,
- time_t Hours, time_t Minutes, time_t Seconds,
- MERIDIAN Meridia, DSTMODE DSTmode, time_t *TimePtr));
- static time_t DSTcorrect _ANSI_ARGS_((time_t Start, time_t Future));
- static time_t NamedDay _ANSI_ARGS_((time_t Start, time_t DayOrdinal,
- time_t DayNumber));
- static time_t NamedMonth _ANSI_ARGS_((time_t Start, time_t MonthOrdinal,
- time_t MonthNumber));
- static int RelativeMonth _ANSI_ARGS_((time_t Start, time_t RelMonth,
- time_t *TimePtr));
- static int RelativeDay _ANSI_ARGS_((time_t Start, time_t RelDay,
- time_t *TimePtr));
- static int LookupWord _ANSI_ARGS_((char *buff));
- static int yylex _ANSI_ARGS_((void));
- int
- yyparse _ANSI_ARGS_((void));
- %}
- %union {
- time_t Number;
- enum _MERIDIAN Meridian;
- }
- %token tAGO tDAY tDAYZONE tID tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT
- %token tSTARDATE tSEC_UNIT tSNUMBER tUNUMBER tZONE tEPOCH tDST tISOBASE
- %token tDAY_UNIT tNEXT
- %type <Number> tDAY tDAYZONE tMINUTE_UNIT tMONTH tMONTH_UNIT tDST
- %type <Number> tSEC_UNIT tSNUMBER tUNUMBER tZONE tISOBASE tDAY_UNIT
- %type <Number> unit sign tNEXT tSTARDATE
- %type <Meridian> tMERIDIAN o_merid
- %%
- spec : /* NULL */
- | spec item
- ;
- item : time {
- yyHaveTime++;
- }
- | zone {
- yyHaveZone++;
- }
- | date {
- yyHaveDate++;
- }
- | ordMonth {
- yyHaveOrdinalMonth++;
- }
- | day {
- yyHaveDay++;
- }
- | relspec {
- yyHaveRel++;
- }
- | iso {
- yyHaveTime++;
- yyHaveDate++;
- }
- | trek {
- yyHaveTime++;
- yyHaveDate++;
- 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 '-' tUNUMBER {
- yyHour = $1;
- yyMinutes = $3;
- yyMeridian = MER24;
- yyDSTmode = DSToff;
- yyTimezone = ($5 % 100 + ($5 / 100) * 60);
- }
- | tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid {
- yyHour = $1;
- yyMinutes = $3;
- yySeconds = $5;
- yyMeridian = $6;
- }
- | tUNUMBER ':' tUNUMBER ':' tUNUMBER '-' tUNUMBER {
- yyHour = $1;
- yyMinutes = $3;
- yySeconds = $5;
- yyMeridian = MER24;
- yyDSTmode = DSToff;
- yyTimezone = ($7 % 100 + ($7 / 100) * 60);
- }
- ;
- zone : tZONE tDST {
- yyTimezone = $1;
- yyDSTmode = DSTon;
- }
- | tZONE {
- yyTimezone = $1;
- yyDSTmode = DSToff;
- }
- | tDAYZONE {
- yyTimezone = $1;
- yyDSTmode = DSTon;
- }
- ;
- day : tDAY {
- yyDayOrdinal = 1;
- yyDayNumber = $1;
- }
- | tDAY ',' {
- yyDayOrdinal = 1;
- yyDayNumber = $1;
- }
- | tUNUMBER tDAY {
- yyDayOrdinal = $1;
- yyDayNumber = $2;
- }
- | sign tUNUMBER tDAY {
- yyDayOrdinal = $1 * $2;
- yyDayNumber = $3;
- }
- | tNEXT tDAY {
- yyDayOrdinal = 2;
- yyDayNumber = $2;
- }
- ;
- date : tUNUMBER '/' tUNUMBER {
- yyMonth = $1;
- yyDay = $3;
- }
- | tUNUMBER '/' tUNUMBER '/' tUNUMBER {
- yyMonth = $1;
- yyDay = $3;
- yyYear = $5;
- }
- | tISOBASE {
- yyYear = $1 / 10000;
- yyMonth = ($1 % 10000)/100;
- yyDay = $1 % 100;
- }
- | tUNUMBER '-' tMONTH '-' tUNUMBER {
- yyDay = $1;
- yyMonth = $3;
- yyYear = $5;
- }
- | tUNUMBER '-' tUNUMBER '-' tUNUMBER {
- yyMonth = $3;
- yyDay = $5;
- yyYear = $1;
- }
- | tMONTH tUNUMBER {
- yyMonth = $1;
- yyDay = $2;
- }
- | tMONTH tUNUMBER ',' tUNUMBER {
- yyMonth = $1;
- yyDay = $2;
- yyYear = $4;
- }
- | tUNUMBER tMONTH {
- yyMonth = $2;
- yyDay = $1;
- }
- | tEPOCH {
- yyMonth = 1;
- yyDay = 1;
- yyYear = EPOCH;
- }
- | tUNUMBER tMONTH tUNUMBER {
- yyMonth = $2;
- yyDay = $1;
- yyYear = $3;
- }
- ;
- ordMonth: tNEXT tMONTH {
- yyMonthOrdinal = 1;
- yyMonth = $2;
- }
- | tNEXT tUNUMBER tMONTH {
- yyMonthOrdinal = $2;
- yyMonth = $3;
- }
- ;
- iso : tISOBASE tZONE tISOBASE {
- if ($2 != HOUR(- 7)) YYABORT;
- yyYear = $1 / 10000;
- yyMonth = ($1 % 10000)/100;
- yyDay = $1 % 100;
- yyHour = $3 / 10000;
- yyMinutes = ($3 % 10000)/100;
- yySeconds = $3 % 100;
- }
- | tISOBASE tZONE tUNUMBER ':' tUNUMBER ':' tUNUMBER {
- if ($2 != HOUR(- 7)) YYABORT;
- yyYear = $1 / 10000;
- yyMonth = ($1 % 10000)/100;
- yyDay = $1 % 100;
- yyHour = $3;
- yyMinutes = $5;
- yySeconds = $7;
- }
- | tISOBASE tISOBASE {
- yyYear = $1 / 10000;
- yyMonth = ($1 % 10000)/100;
- yyDay = $1 % 100;
- yyHour = $2 / 10000;
- yyMinutes = ($2 % 10000)/100;
- yySeconds = $2 % 100;
- }
- ;
- trek : tSTARDATE tUNUMBER '.' tUNUMBER {
- /*
- * Offset computed year by -377 so that the returned years will
- * be in a range accessible with a 32 bit clock seconds value
- */
- yyYear = $2/1000 + 2323 - 377;
- yyDay = 1;
- yyMonth = 1;
- yyRelDay += (($2%1000)*(365 + IsLeapYear(yyYear)))/1000;
- yyRelSeconds += $4 * 144 * 60;
- }
- ;
- relspec : relunits tAGO {
- yyRelSeconds *= -1;
- yyRelMonth *= -1;
- yyRelDay *= -1;
- }
- | relunits
- ;
- relunits : sign tUNUMBER unit { *yyRelPointer += $1 * $2 * $3; }
- | tUNUMBER unit { *yyRelPointer += $1 * $2; }
- | tNEXT unit { *yyRelPointer += $2; }
- | tNEXT tUNUMBER unit { *yyRelPointer += $2 * $3; }
- | unit { *yyRelPointer += $1; }
- ;
- sign : '-' { $$ = -1; }
- | '+' { $$ = 1; }
- ;
- unit : tSEC_UNIT { $$ = $1; yyRelPointer = &yyRelSeconds; }
- | tDAY_UNIT { $$ = $1; yyRelPointer = &yyRelDay; }
- | tMONTH_UNIT { $$ = $1; yyRelPointer = &yyRelMonth; }
- ;
- number : tUNUMBER
- {
- if (yyHaveTime && yyHaveDate && !yyHaveRel) {
- yyYear = $1;
- } else {
- yyHaveTime++;
- if ($1 < 100) {
- yyHour = $1;
- yyMinutes = 0;
- } else {
- yyHour = $1 / 100;
- yyMinutes = $1 % 100;
- }
- yySeconds = 0;
- yyMeridian = MER24;
- }
- }
- ;
- o_merid : /* NULL */ {
- $$ = MER24;
- }
- | tMERIDIAN {
- $$ = $1;
- }
- ;
- %%
- /*
- * Month and day table.
- */
- static TABLE 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", tDAY_UNIT, 14 },
- { "week", tDAY_UNIT, 7 },
- { "day", tDAY_UNIT, 1 },
- { "hour", tSEC_UNIT, 60 * 60 },
- { "minute", tSEC_UNIT, 60 },
- { "min", tSEC_UNIT, 60 },
- { "second", tSEC_UNIT, 1 },
- { "sec", tSEC_UNIT, 1 },
- { NULL }
- };
- /*
- * Assorted relative-time words.
- */
- static TABLE OtherTable[] = {
- { "tomorrow", tDAY_UNIT, 1 },
- { "yesterday", tDAY_UNIT, -1 },
- { "today", tDAY_UNIT, 0 },
- { "now", tSEC_UNIT, 0 },
- { "last", tUNUMBER, -1 },
- { "this", tSEC_UNIT, 0 },
- { "next", tNEXT, 1 },
- #if 0
- { "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 },
- #endif
- { "ago", tAGO, 1 },
- { "epoch", tEPOCH, 0 },
- { "stardate", tSTARDATE, 0},
- { NULL }
- };
- /*
- * The timezone table. (Note: This table was modified to not use any floating
- * point constants to work around an SGI compiler bug).
- */
- static TABLE TimezoneTable[] = {
- { "gmt", tZONE, HOUR( 0) }, /* Greenwich Mean */
- { "ut", tZONE, HOUR( 0) }, /* Universal (Coordinated) */
- { "utc", tZONE, HOUR( 0) },
- { "uct", tZONE, HOUR( 0) }, /* Universal Coordinated Time */
- { "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( 7/2) }, /* Newfoundland */
- { "nst", tZONE, HOUR( 7/2) }, /* Newfoundland Standard */
- { "ndt", tDAYZONE, HOUR( 7/2) }, /* 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 */
- { "cest", tDAYZONE, -HOUR( 1) }, /* Central European Summer */
- { "met", tZONE, -HOUR( 1) }, /* Middle European */
- { "mewt", tZONE, -HOUR( 1) }, /* Middle European Winter */
- { "mest", tDAYZONE, -HOUR( 1) }, /* Middle European Summer */
- { "swt", tZONE, -HOUR( 1) }, /* Swedish Winter */
- { "sst", tDAYZONE, -HOUR( 1) }, /* Swedish Summer */
- { "fwt", tZONE, -HOUR( 1) }, /* French Winter */
- { "fst", tDAYZONE, -HOUR( 1) }, /* French Summer */
- { "eet", tZONE, -HOUR( 2) }, /* Eastern Europe, USSR Zone 1 */
- { "bt", tZONE, -HOUR( 3) }, /* Baghdad, USSR Zone 2 */
- { "it", tZONE, -HOUR( 7/2) }, /* Iran */
- { "zp4", tZONE, -HOUR( 4) }, /* USSR Zone 3 */
- { "zp5", tZONE, -HOUR( 5) }, /* USSR Zone 4 */
- { "ist", tZONE, -HOUR(11/2) }, /* Indian Standard */
- { "zp6", tZONE, -HOUR( 6) }, /* USSR Zone 5 */
- #if 0
- /* For completeness. NST is also Newfoundland Stanard, nad SST is
- * also Swedish Summer. */
- { "nst", tZONE, -HOUR(13/2) }, /* 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 */
- { "jt", tZONE, -HOUR(15/2) }, /* Java (3pm in Cronusland!) */
- { "cct", tZONE, -HOUR( 8) }, /* China Coast, USSR Zone 7 */
- { "jst", tZONE, -HOUR( 9) }, /* Japan Standard, USSR Zone 8 */
- { "jdt", tDAYZONE, -HOUR( 9) }, /* Japan Daylight */
- { "kst", tZONE, -HOUR( 9) }, /* Korea Standard */
- { "kdt", tDAYZONE, -HOUR( 9) }, /* Korea Daylight */
- { "cast", tZONE, -HOUR(19/2) }, /* Central Australian Standard */
- { "cadt", tDAYZONE, -HOUR(19/2) }, /* Central Australian Daylight */
- { "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 */
- /* ADDED BY Marco Nijdam */
- { "dst", tDST, HOUR( 0) }, /* DST on (hour is ignored) */
- /* End ADDED */
- { NULL }
- };
- /*
- * Military timezone table.
- */
- static TABLE 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 }
- };
- /*
- * Dump error messages in the bit bucket.
- */
- static void
- yyerror(s)
- char *s;
- {
- }
- static time_t
- ToSeconds(Hours, Minutes, Seconds, Meridian)
- time_t Hours;
- time_t Minutes;
- time_t Seconds;
- MERIDIAN Meridian;
- {
- if (Minutes < 0 || Minutes > 59 || Seconds < 0 || Seconds > 59)
- return -1;
- switch (Meridian) {
- case MER24:
- if (Hours < 0 || Hours > 23)
- return -1;
- return (Hours * 60L + Minutes) * 60L + Seconds;
- case MERam:
- if (Hours < 1 || Hours > 12)
- return -1;
- return ((Hours % 12) * 60L + Minutes) * 60L + Seconds;
- case MERpm:
- if (Hours < 1 || Hours > 12)
- return -1;
- return (((Hours % 12) + 12) * 60L + Minutes) * 60L + Seconds;
- }
- return -1; /* Should never be reached */
- }
- /*
- *-----------------------------------------------------------------------------
- *
- * Convert --
- *
- * Convert a {month, day, year, hours, minutes, seconds, meridian, dst}
- * tuple into a clock seconds value.
- *
- * Results:
- * 0 or -1 indicating success or failure.
- *
- * Side effects:
- * Fills TimePtr with the computed value.
- *
- *-----------------------------------------------------------------------------
- */
- static int
- Convert(Month, Day, Year, Hours, Minutes, Seconds, Meridian, DSTmode, TimePtr)
- time_t Month;
- time_t Day;
- time_t Year;
- time_t Hours;
- time_t Minutes;
- time_t Seconds;
- MERIDIAN Meridian;
- DSTMODE DSTmode;
- time_t *TimePtr;
- {
- static int DaysInMonth[12] = {
- 31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
- };
- time_t tod;
- time_t Julian;
- int i;
- /* Figure out how many days are in February for the given year.
- * Every year divisible by 4 is a leap year.
- * But, every year divisible by 100 is not a leap year.
- * But, every year divisible by 400 is a leap year after all.
- */
- DaysInMonth[1] = IsLeapYear(Year) ? 29 : 28;
- /* Check the inputs for validity */
- if (Month < 1 || Month > 12
- || Year < START_OF_TIME || Year > END_OF_TIME
- || Day < 1 || Day > DaysInMonth[(int)--Month])
- return -1;
- /* Start computing the value. First determine the number of days
- * represented by the date, then multiply by the number of seconds/day.
- */
- for (Julian = Day - 1, i = 0; i < Month; i++)
- Julian += DaysInMonth[i];
- if (Year >= EPOCH) {
- for (i = EPOCH; i < Year; i++)
- Julian += 365 + IsLeapYear(i);
- } else {
- for (i = Year; i < EPOCH; i++)
- Julian -= 365 + IsLeapYear(i);
- }
- Julian *= SECSPERDAY;
- /* Add the timezone offset ?? */
- Julian += yyTimezone * 60L;
- /* Add the number of seconds represented by the time component */
- if ((tod = ToSeconds(Hours, Minutes, Seconds, Meridian)) < 0)
- return -1;
- Julian += tod;
- /* Perform a preliminary DST compensation ?? */
- if (DSTmode == DSTon
- || (DSTmode == DSTmaybe && TclpGetDate((TclpTime_t)&Julian, 0)->tm_isdst))
- Julian -= 60 * 60;
- *TimePtr = Julian;
- return 0;
- }
- static time_t
- DSTcorrect(Start, Future)
- time_t Start;
- time_t Future;
- {
- time_t StartDay;
- time_t FutureDay;
- StartDay = (TclpGetDate((TclpTime_t)&Start, 0)->tm_hour + 1) % 24;
- FutureDay = (TclpGetDate((TclpTime_t)&Future, 0)->tm_hour + 1) % 24;
- return (Future - Start) + (StartDay - FutureDay) * 60L * 60L;
- }
- static time_t
- NamedDay(Start, DayOrdinal, DayNumber)
- time_t Start;
- time_t DayOrdinal;
- time_t DayNumber;
- {
- struct tm *tm;
- time_t now;
- now = Start;
- tm = TclpGetDate((TclpTime_t)&now, 0);
- now += SECSPERDAY * ((DayNumber - tm->tm_wday + 7) % 7);
- now += 7 * SECSPERDAY * (DayOrdinal <= 0 ? DayOrdinal : DayOrdinal - 1);
- return DSTcorrect(Start, now);
- }
- static time_t
- NamedMonth(Start, MonthOrdinal, MonthNumber)
- time_t Start;
- time_t MonthOrdinal;
- time_t MonthNumber;
- {
- struct tm *tm;
- time_t now;
- int result;
-
- now = Start;
- tm = TclpGetDate((TclpTime_t)&now, 0);
- /* To compute the next n'th month, we use this alg:
- * add n to year value
- * if currentMonth < requestedMonth decrement year value by 1 (so that
- * doing next february from january gives us february of the current year)
- * set day to 1, time to 0
- */
- tm->tm_year += MonthOrdinal;
- if (tm->tm_mon < MonthNumber - 1) {
- tm->tm_year--;
- }
- result = Convert(MonthNumber, (time_t) 1, tm->tm_year + TM_YEAR_BASE,
- (time_t) 0, (time_t) 0, (time_t) 0, MER24, DSTmaybe, &now);
- if (result < 0) {
- return 0;
- }
- return DSTcorrect(Start, now);
- }
- static int
- RelativeMonth(Start, RelMonth, TimePtr)
- time_t Start;
- time_t RelMonth;
- time_t *TimePtr;
- {
- struct tm *tm;
- time_t Month;
- time_t Year;
- time_t Julian;
- int result;
- if (RelMonth == 0) {
- *TimePtr = 0;
- return 0;
- }
- tm = TclpGetDate((TclpTime_t)&Start, 0);
- Month = 12 * (tm->tm_year + TM_YEAR_BASE) + tm->tm_mon + RelMonth;
- Year = Month / 12;
- Month = Month % 12 + 1;
- result = Convert(Month, (time_t) tm->tm_mday, Year,
- (time_t) tm->tm_hour, (time_t) tm->tm_min, (time_t) tm->tm_sec,
- MER24, DSTmaybe, &Julian);
- /*
- * The Julian time returned above is behind by one day, if "month"
- * or "year" is used to specify relative time and the GMT flag is true.
- * This problem occurs only when the current time is closer to
- * midnight, the difference being not more than its time difference
- * with GMT. For example, in US/Pacific time zone, the problem occurs
- * whenever the current time is between midnight to 8:00am or 7:00amDST.
- * See Bug# 413397 for more details and sample script.
- * To resolve this bug, we simply add the number of seconds corresponding
- * to timezone difference with GMT to Julian time, if GMT flag is true.
- */
- if (TclDateTimezone == 0) {
- Julian += TclpGetTimeZone((unsigned long) Start) * 60L;
- }
- /*
- * The following iteration takes into account the case were we jump
- * into a "short month". Far example, "one month from Jan 31" will
- * fail because there is no Feb 31. The code below will reduce the
- * day and try converting the date until we succed or the date equals
- * 28 (which always works unless the date is bad in another way).
- */
- while ((result != 0) && (tm->tm_mday > 28)) {
- tm->tm_mday--;
- result = Convert(Month, (time_t) tm->tm_mday, Year,
- (time_t) tm->tm_hour, (time_t) tm->tm_min, (time_t) tm->tm_sec,
- MER24, DSTmaybe, &Julian);
- }
- if (result != 0) {
- return -1;
- }
- *TimePtr = DSTcorrect(Start, Julian);
- return 0;
- }
- /*
- *-----------------------------------------------------------------------------
- *
- * RelativeDay --
- *
- * Given a starting time and a number of days before or after, compute the
- * DST corrected difference between those dates.
- *
- * Results:
- * 1 or -1 indicating success or failure.
- *
- * Side effects:
- * Fills TimePtr with the computed value.
- *
- *-----------------------------------------------------------------------------
- */
- static int
- RelativeDay(Start, RelDay, TimePtr)
- time_t Start;
- time_t RelDay;
- time_t *TimePtr;
- {
- time_t new;
- new = Start + (RelDay * 60 * 60 * 24);
- *TimePtr = DSTcorrect(Start, new);
- return 1;
- }
- static int
- LookupWord(buff)
- char *buff;
- {
- register char *p;
- register char *q;
- register TABLE *tp;
- int i;
- int abbrev;
- /*
- * Make it lowercase.
- */
- Tcl_UtfToLower(buff);
- 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] = ' ';
- } 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;
- }
- }
- 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] = ' ';
- for (tp = UnitsTable; tp->name; tp++) {
- if (strcmp(buff, tp->name) == 0) {
- yylval.Number = tp->value;
- return tp->type;
- }
- }
- }
- for (tp = OtherTable; tp->name; tp++) {
- if (strcmp(buff, tp->name) == 0) {
- yylval.Number = tp->value;
- return tp->type;
- }
- }
- /*
- * Military timezones.
- */
- if (buff[1] == ' ' && !(*buff & 0x80)
- && isalpha(UCHAR(*buff))) { /* INTL: ISO only */
- 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 = ' ';
- 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 char c;
- register char *p;
- char buff[20];
- int Count;
- for ( ; ; ) {
- while (isspace(UCHAR(*yyInput))) {
- yyInput++;
- }
- if (isdigit(UCHAR(c = *yyInput))) { /* INTL: digit */
- /* convert the string into a number; count the number of digits */
- Count = 0;
- for (yylval.Number = 0;
- isdigit(UCHAR(c = *yyInput++)); ) { /* INTL: digit */
- yylval.Number = 10 * yylval.Number + c - '0';
- Count++;
- }
- yyInput--;
- /* A number with 6 or more digits is considered an ISO 8601 base */
- if (Count >= 6) {
- return tISOBASE;
- } else {
- return tUNUMBER;
- }
- }
- if (!(c & 0x80) && isalpha(UCHAR(c))) { /* INTL: ISO only. */
- for (p = buff; isalpha(UCHAR(c = *yyInput++)) /* INTL: ISO only. */
- || c == '.'; ) {
- if (p < &buff[sizeof buff - 1]) {
- *p++ = c;
- }
- }
- *p = ' ';
- yyInput--;
- return LookupWord(buff);
- }
- if (c != '(') {
- return *yyInput++;
- }
- Count = 0;
- do {
- c = *yyInput++;
- if (c == ' ') {
- return c;
- } else if (c == '(') {
- Count++;
- } else if (c == ')') {
- Count--;
- }
- } while (Count > 0);
- }
- }
- /*
- * Specify zone is of -50000 to force GMT. (This allows BST to work).
- */
- int
- TclGetDate(p, now, zone, timePtr)
- char *p;
- Tcl_WideInt now;
- long zone;
- Tcl_WideInt *timePtr;
- {
- struct tm *tm;
- time_t Start;
- time_t Time;
- time_t tod;
- int thisyear;
- yyInput = p;
- /* now has to be cast to a time_t for 64bit compliance */
- Start = (time_t) now;
- tm = TclpGetDate((TclpTime_t) &Start, (zone == -50000));
- thisyear = tm->tm_year + TM_YEAR_BASE;
- yyYear = thisyear;
- yyMonth = tm->tm_mon + 1;
- yyDay = tm->tm_mday;
- yyTimezone = zone;
- if (zone == -50000) {
- yyDSTmode = DSToff; /* assume GMT */
- yyTimezone = 0;
- } else {
- yyDSTmode = DSTmaybe;
- }
- yyHour = 0;
- yyMinutes = 0;
- yySeconds = 0;
- yyMeridian = MER24;
- yyRelSeconds = 0;
- yyRelMonth = 0;
- yyRelDay = 0;
- yyRelPointer = NULL;
- yyHaveDate = 0;
- yyHaveDay = 0;
- yyHaveOrdinalMonth = 0;
- yyHaveRel = 0;
- yyHaveTime = 0;
- yyHaveZone = 0;
- if (yyparse() || yyHaveTime > 1 || yyHaveZone > 1 || yyHaveDate > 1 ||
- yyHaveDay > 1 || yyHaveOrdinalMonth > 1) {
- return -1;
- }
-
- if (yyHaveDate || yyHaveTime || yyHaveDay) {
- if (TclDateYear < 0) {
- TclDateYear = -TclDateYear;
- }
- /*
- * The following line handles years that are specified using
- * only two digits. The line of code below implements a policy
- * defined by the X/Open workgroup on the millinium rollover.
- * Note: some of those dates may not actually be valid on some
- * platforms. The POSIX standard startes that the dates 70-99
- * shall refer to 1970-1999 and 00-38 shall refer to 2000-2038.
- * This later definition should work on all platforms.
- */
- if (TclDateYear < 100) {
- if (TclDateYear >= 69) {
- TclDateYear += 1900;
- } else {
- TclDateYear += 2000;
- }
- }
- if (Convert(yyMonth, yyDay, yyYear, yyHour, yyMinutes, yySeconds,
- yyMeridian, yyDSTmode, &Start) < 0) {
- return -1;
- }
- } else {
- Start = (time_t) now;
- if (!yyHaveRel) {
- Start -= ((tm->tm_hour * 60L * 60L) +
- tm->tm_min * 60L) + tm->tm_sec;
- }
- }
- Start += yyRelSeconds;
- if (RelativeMonth(Start, yyRelMonth, &Time) < 0) {
- return -1;
- }
- Start += Time;
- if (RelativeDay(Start, yyRelDay, &Time) < 0) {
- return -1;
- }
- Start += Time;
-
- if (yyHaveDay && !yyHaveDate) {
- tod = NamedDay(Start, yyDayOrdinal, yyDayNumber);
- Start += tod;
- }
- if (yyHaveOrdinalMonth) {
- tod = NamedMonth(Start, yyMonthOrdinal, yyMonth);
- Start += tod;
- }
-
- *timePtr = Start;
- return 0;
- }