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Diffstat (limited to 'src/parsdate.y')
| -rw-r--r-- | src/parsdate.y | 991 |
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diff --git a/src/parsdate.y b/src/parsdate.y new file mode 100644 index 0000000..d665514 --- /dev/null +++ b/src/parsdate.y @@ -0,0 +1,991 @@ +%{ + +#include <LYLeaks.h> + +/* + * $LynxId: parsdate.y,v 1.31 2021/06/08 23:01:28 tom Exp $ + * + * This module is adapted and extended from tin, to use for LYmktime(). + * + * Project : tin - a Usenet reader + * Module : parsedate.y + * Author : S. Bellovin, R. $alz, J. Berets, P. Eggert + * Created : 1990-08-01 + * Updated : 2019-08-28 (by Thomas Dickey, for Lynx) + * Notes : This grammar has 8 shift/reduce conflicts. + * + * Originally written by Steven M. Bellovin <smb@research.att.com> + * while at the University of North Carolina at Chapel Hill. + * Later tweaked by a couple of people on Usenet. Completely + * overhauled by Rich $alz <rsalz@osf.org> and Jim Berets + * <jberets@bbn.com> in August, 1990. + * + * Further revised (removed obsolete constructs and cleaned up + * timezone names) in August, 1991, by Rich. + * Paul Eggert <eggert@twinsun.com> helped in September 1992. + * Roland Rosenfeld added MET DST code in April 1994. + * + * Revision : 1.13 + * Copyright : This code is in the public domain and has no copyright. + */ + +/* SUPPRESS 530 */ /* Empty body for statement */ +/* SUPPRESS 593 on yyerrlab */ /* Label was not used */ +/* SUPPRESS 593 on yynewstate */ /* Label was not used */ +/* SUPPRESS 595 on yypvt */ /* Automatic variable may be used before set */ + +#undef alloca /* conflicting def may be set by yacc */ +#include <parsdate.h> + +/* +** Get the number of elements in a fixed-size array, or a pointer just +** past the end of it. +*/ +#define ENDOF(array) (&array[ARRAY_SIZE(array)]) + +#ifdef EBCDIC +#define TO_ASCII(c) TOASCII(c) +#define TO_LOCAL(c) FROMASCII(c) +#else +#define TO_ASCII(c) (c) +#define TO_LOCAL(c) (c) +#endif + +#define IS7BIT(x) ((unsigned) TO_ASCII(x) < 128) +#define CTYPE(isXXXXX, c) (IS7BIT(c) && isXXXXX(((unsigned char)c))) + +typedef char *PD_STRING; + +extern int date_parse(void); + +#define yyparse date_parse +#define yylex date_lex +#define yyerror date_error + +#define BAD_TIME ((time_t)-1) +#define isBadTime(n) ((n) != 0 && (((n) == BAD_TIME) || !((n) > 0))) + + /* See the LeapYears table in Convert. */ +#define EPOCH 1970 +#define END_OF_TIME 2200 + + /* Constants for general time calculations. */ +#define DST_OFFSET 1 +#define SECSPERDAY (24L * 60L * 60L) + /* Readability for TABLE stuff. */ +#define HOUR(x) (x * 60) + +#define LPAREN '(' +#define RPAREN ')' + +/* +** Daylight-savings mode: on, off, or not yet known. +*/ +typedef enum _DSTMODE { + DSTon, DSToff, DSTmaybe +} DSTMODE; + +/* +** Meridian: am, pm, or 24-hour style. +*/ +typedef enum _MERIDIAN { + MERam, MERpm, MER24 +} MERIDIAN; + +/* +** Global variables. We could get rid of most of them by using a yacc +** union, but this is more efficient. (This routine predates the +** yacc %union construct.) +*/ +static char *yyInput; +static DSTMODE yyDSTmode; +static int yyHaveDate; +static int yyHaveRel; +static int yyHaveTime; +static time_t yyTimezone; +static time_t yyDay; +static time_t yyHour; +static time_t yyMinutes; +static time_t yyMonth; +static time_t yySeconds; +static time_t yyYear; +static MERIDIAN yyMeridian; +static time_t yyRelMonth; +static time_t yyRelSeconds; + +static time_t ToSeconds(time_t, time_t, time_t, MERIDIAN); +static time_t Convert(time_t, time_t, time_t, time_t, time_t, time_t, + MERIDIAN, DSTMODE); +static time_t DSTcorrect(time_t, time_t); +static time_t RelativeMonth(time_t, time_t); +static int LookupWord(char *, int); +static int date_lex(void); +static int GetTimeInfo(TIMEINFO * Now); + +/* + * The 'date_error()' function is declared here to work around a defect in + * bison 1.22, which redefines 'const' further down in this file, making it + * impossible to put a prototype here, and the function later. We're using + * 'const' on the parameter to quiet gcc's -Wwrite-strings warning. + */ +/*ARGSUSED*/ +static void date_error(const char GCC_UNUSED *s) +{ + /*NOTREACHED */ +} + +%} + +%union { + time_t Number; + enum _MERIDIAN Meridian; +} + +%token tDAY tDAYZONE tMERIDIAN tMONTH tMONTH_UNIT tSEC_UNIT tSNUMBER +%token tUNUMBER tZONE tDST + +%type <Number> tDAYZONE tMONTH tMONTH_UNIT tSEC_UNIT +%type <Number> tSNUMBER tUNUMBER tZONE numzone zone +%type <Meridian> tMERIDIAN o_merid + +%% + +spec : /* NULL */ + | spec item + ; + +item : time { + yyHaveTime++; +#if defined(lint) + /* I am compulsive about lint natterings... */ + if (yyHaveTime == -1) { + YYERROR; + } +#endif /* defined(lint) */ + } + | time zone { + yyHaveTime++; + yyTimezone = $2; + } + | date { + yyHaveDate++; + } + | both { + yyHaveDate++; + yyHaveTime++; + } + | both zone { + yyHaveDate++; + yyHaveTime++; + yyTimezone = $2; + } + | rel { + yyHaveRel = 1; + } + ; + +time : tUNUMBER o_merid { + if ($1 < 100) { + yyHour = $1; + yyMinutes = 0; + } + else { + yyHour = $1 / 100; + yyMinutes = $1 % 100; + } + yySeconds = 0; + yyMeridian = $2; + } + | tUNUMBER ':' tUNUMBER o_merid { + yyHour = $1; + yyMinutes = $3; + yySeconds = 0; + yyMeridian = $4; + } + | tUNUMBER ':' tUNUMBER numzone { + yyHour = $1; + yyMinutes = $3; + yyTimezone = $4; + yyMeridian = MER24; + yyDSTmode = DSToff; + } + | tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid { + yyHour = $1; + yyMinutes = $3; + yySeconds = $5; + yyMeridian = $6; + } + | tUNUMBER ':' tUNUMBER ':' tUNUMBER numzone { + yyHour = $1; + yyMinutes = $3; + yySeconds = $5; + yyTimezone = $6; + yyMeridian = MER24; + yyDSTmode = DSToff; + } + ; + +zone : tZONE { + $$ = $1; + yyDSTmode = DSToff; + } + | tDAYZONE { + $$ = $1; + yyDSTmode = DSTon; + } + | tDAYZONE tDST { + yyTimezone = $1; + yyDSTmode = DSTon; + } + | tZONE numzone { + /* Only allow "GMT+300" and "GMT-0800" */ + if ($1 != 0) { + YYABORT; + } + $$ = $2; + yyDSTmode = DSToff; + } + | numzone { + $$ = $1; + yyDSTmode = DSToff; + } + ; + +numzone : tSNUMBER { + int i; + + /* Unix and GMT and numeric timezones -- a little confusing. */ + if ((int)$1 < 0) { + /* Don't work with negative modulus. */ + $1 = -(int)$1; + if ($1 > 9999 || (i = (int) ($1 % 100)) >= 60) { + YYABORT; + } + $$ = ($1 / 100) * 60 + i; + } + else { + if ($1 > 9999 || (i = (int) ($1 % 100)) >= 60) { + YYABORT; + } + $$ = -(($1 / 100) * 60 + i); + } + } + ; + +date : tUNUMBER '/' tUNUMBER { + yyMonth = $1; + yyDay = $3; + } + | tUNUMBER '/' tUNUMBER '/' tUNUMBER { + if ($1 > 100) { + yyYear = $1; + yyMonth = $3; + yyDay = $5; + } + else { + yyMonth = $1; + yyDay = $3; + yyYear = $5; + } + } + | tMONTH tUNUMBER { + yyMonth = $1; + yyDay = $2; + } + | tMONTH tUNUMBER ',' tUNUMBER { + yyMonth = $1; + yyDay = $2; + yyYear = $4; + } + | tUNUMBER tMONTH { + yyDay = $1; + yyMonth = $2; + } + | tUNUMBER tMONTH tUNUMBER { + yyDay = $1; + yyMonth = $2; + yyYear = $3; + } + | tDAY ',' tUNUMBER tMONTH tUNUMBER { + yyDay = $3; + yyMonth = $4; + yyYear = $5; + } + | tDAY ',' tUNUMBER '-' tMONTH tSNUMBER { + yyDay = $3; + yyMonth = $5; + yyYear = -$6; + } + | tUNUMBER tSNUMBER tSNUMBER { + yyDay = $1; + yyMonth = -$2; + yyYear = -$3; + yyDSTmode = DSToff; /* assume midnight if no time given */ + yyTimezone = 0; /* Lynx assumes GMT for this format */ + } + ; + +both : tDAY tMONTH tUNUMBER tUNUMBER ':' tUNUMBER ':' tUNUMBER tUNUMBER { + yyMonth = $2; + yyDay = $3; + yyYear = $9; + yyHour = $4; + yyMinutes = $6; + yySeconds = $8; + } + ; + +rel : tSNUMBER tSEC_UNIT { + yyRelSeconds += $1 * $2; + } + | tUNUMBER tSEC_UNIT { + yyRelSeconds += $1 * $2; + } + | tSNUMBER tMONTH_UNIT { + yyRelMonth += $1 * $2; + } + | tUNUMBER tMONTH_UNIT { + yyRelMonth += $1 * $2; + } + ; + +o_merid : /* NULL */ { + $$ = MER24; + } + | tMERIDIAN { + $$ = $1; + } + ; + +%% + + +/* +** An entry in the lexical lookup table. +*/ +/* *INDENT-OFF* */ +typedef struct _TABLE { + const char *name; + int type; + time_t value; +} TABLE; + +/* Month and day table. */ +static const TABLE MonthDayTable[] = { + { "january", tMONTH, 1 }, + { "february", tMONTH, 2 }, + { "march", tMONTH, 3 }, + { "april", tMONTH, 4 }, + { "may", tMONTH, 5 }, + { "june", tMONTH, 6 }, + { "july", tMONTH, 7 }, + { "august", tMONTH, 8 }, + { "september", tMONTH, 9 }, + { "october", tMONTH, 10 }, + { "november", tMONTH, 11 }, + { "december", tMONTH, 12 }, + /* The value of the day isn't used... */ + { "sunday", tDAY, 0 }, + { "monday", tDAY, 0 }, + { "tuesday", tDAY, 0 }, + { "wednesday", tDAY, 0 }, + { "thursday", tDAY, 0 }, + { "friday", tDAY, 0 }, + { "saturday", tDAY, 0 }, +}; + +/* Time units table. */ +static const TABLE UnitsTable[] = { + { "year", tMONTH_UNIT, 12 }, + { "month", tMONTH_UNIT, 1 }, + { "week", tSEC_UNIT, 7 * 24 * 60 * 60 }, + { "day", tSEC_UNIT, 1 * 24 * 60 * 60 }, + { "hour", tSEC_UNIT, 60 * 60 }, + { "minute", tSEC_UNIT, 60 }, + { "min", tSEC_UNIT, 60 }, + { "second", tSEC_UNIT, 1 }, + { "sec", tSEC_UNIT, 1 }, +}; + +/* Timezone table. */ +static const TABLE TimezoneTable[] = { + { "gmt", tZONE, HOUR( 0) }, /* Greenwich Mean */ + { "ut", tZONE, HOUR( 0) }, /* Universal */ + { "utc", tZONE, HOUR( 0) }, /* Universal Coordinated */ + { "cut", tZONE, HOUR( 0) }, /* Coordinated Universal */ + { "z", tZONE, HOUR( 0) }, /* Greenwich Mean */ + { "wet", tZONE, HOUR( 0) }, /* Western European */ + { "bst", tDAYZONE, HOUR( 0) }, /* British Summer */ + { "nst", tZONE, HOUR(3)+30 }, /* Newfoundland Standard */ + { "ndt", tDAYZONE, HOUR(3)+30 }, /* Newfoundland Daylight */ + { "ast", tZONE, HOUR( 4) }, /* Atlantic Standard */ + { "adt", tDAYZONE, HOUR( 4) }, /* Atlantic Daylight */ + { "est", tZONE, HOUR( 5) }, /* Eastern Standard */ + { "edt", tDAYZONE, HOUR( 5) }, /* Eastern Daylight */ + { "cst", tZONE, HOUR( 6) }, /* Central Standard */ + { "cdt", tDAYZONE, HOUR( 6) }, /* Central Daylight */ + { "mst", tZONE, HOUR( 7) }, /* Mountain Standard */ + { "mdt", tDAYZONE, HOUR( 7) }, /* Mountain Daylight */ + { "pst", tZONE, HOUR( 8) }, /* Pacific Standard */ + { "pdt", tDAYZONE, HOUR( 8) }, /* Pacific Daylight */ + { "yst", tZONE, HOUR( 9) }, /* Yukon Standard */ + { "ydt", tDAYZONE, HOUR( 9) }, /* Yukon Daylight */ + { "akst", tZONE, HOUR( 9) }, /* Alaska Standard */ + { "akdt", tDAYZONE, HOUR( 9) }, /* Alaska Daylight */ + { "hst", tZONE, HOUR(10) }, /* Hawaii Standard */ + { "hast", tZONE, HOUR(10) }, /* Hawaii-Aleutian Standard */ + { "hadt", tDAYZONE, HOUR(10) }, /* Hawaii-Aleutian Daylight */ + { "ces", tDAYZONE, -HOUR(1) }, /* Central European Summer */ + { "cest", tDAYZONE, -HOUR(1) }, /* Central European Summer */ + { "mez", tZONE, -HOUR(1) }, /* Middle European */ + { "mezt", tDAYZONE, -HOUR(1) }, /* Middle European Summer */ + { "cet", tZONE, -HOUR(1) }, /* Central European */ + { "met", tZONE, -HOUR(1) }, /* Middle European */ +/* Additional aliases for MET / MET DST *************************************/ + { "mez", tZONE, -HOUR(1) }, /* Middle European */ + { "mewt", tZONE, -HOUR(1) }, /* Middle European Winter */ + { "mest", tDAYZONE, -HOUR(1) }, /* Middle European Summer */ + { "mes", tDAYZONE, -HOUR(1) }, /* Middle European Summer */ + { "mesz", tDAYZONE, -HOUR(1) }, /* Middle European Summer */ + { "msz", tDAYZONE, -HOUR(1) }, /* Middle European Summer */ + { "metdst", tDAYZONE, -HOUR(1) }, /* Middle European Summer */ +/****************************************************************************/ + { "eet", tZONE, -HOUR(2) }, /* Eastern Europe */ + { "msk", tZONE, -HOUR(3) }, /* Moscow Winter */ + { "msd", tDAYZONE, -HOUR(3) }, /* Moscow Summer */ + { "wast", tZONE, -HOUR(8) }, /* West Australian Standard */ + { "wadt", tDAYZONE, -HOUR(8) }, /* West Australian Daylight */ + { "hkt", tZONE, -HOUR(8) }, /* Hong Kong */ + { "cct", tZONE, -HOUR(8) }, /* China Coast */ + { "jst", tZONE, -HOUR(9) }, /* Japan Standard */ + { "kst", tZONE, -HOUR(9) }, /* Korean Standard */ + { "kdt", tZONE, -HOUR(9) }, /* Korean Daylight */ + { "cast", tZONE, -(HOUR(9)+30) }, /* Central Australian Standard */ + { "cadt", tDAYZONE, -(HOUR(9)+30) }, /* Central Australian Daylight */ + { "east", tZONE, -HOUR(10) }, /* Eastern Australian Standard */ + { "eadt", tDAYZONE, -HOUR(10) }, /* Eastern Australian Daylight */ + { "nzst", tZONE, -HOUR(12) }, /* New Zealand Standard */ + { "nzdt", tDAYZONE, -HOUR(12) }, /* New Zealand Daylight */ + + /* For completeness we include the following entries. */ +#if 0 + + /* Duplicate names. Either they conflict with a zone listed above + * (which is either more likely to be seen or just been in circulation + * longer), or they conflict with another zone in this section and + * we could not reasonably choose one over the other. */ + { "fst", tZONE, HOUR( 2) }, /* Fernando De Noronha Standard */ + { "fdt", tDAYZONE, HOUR( 2) }, /* Fernando De Noronha Daylight */ + { "bst", tZONE, HOUR( 3) }, /* Brazil Standard */ + { "est", tZONE, HOUR( 3) }, /* Eastern Standard (Brazil) */ + { "edt", tDAYZONE, HOUR( 3) }, /* Eastern Daylight (Brazil) */ + { "wst", tZONE, HOUR( 4) }, /* Western Standard (Brazil) */ + { "wdt", tDAYZONE, HOUR( 4) }, /* Western Daylight (Brazil) */ + { "cst", tZONE, HOUR( 5) }, /* Chile Standard */ + { "cdt", tDAYZONE, HOUR( 5) }, /* Chile Daylight */ + { "ast", tZONE, HOUR( 5) }, /* Acre Standard */ + { "adt", tDAYZONE, HOUR( 5) }, /* Acre Daylight */ + { "cst", tZONE, HOUR( 5) }, /* Cuba Standard */ + { "cdt", tDAYZONE, HOUR( 5) }, /* Cuba Daylight */ + { "est", tZONE, HOUR( 6) }, /* Easter Island Standard */ + { "edt", tDAYZONE, HOUR( 6) }, /* Easter Island Daylight */ + { "sst", tZONE, HOUR(11) }, /* Samoa Standard */ + { "ist", tZONE, -HOUR(2) }, /* Israel Standard */ + { "idt", tDAYZONE, -HOUR(2) }, /* Israel Daylight */ + { "idt", tDAYZONE, -(HOUR(3)+30) }, /* Iran Daylight */ + { "ist", tZONE, -(HOUR(3)+30) }, /* Iran Standard */ + { "cst", tZONE, -HOUR(8) }, /* China Standard */ + { "cdt", tDAYZONE, -HOUR(8) }, /* China Daylight */ + { "sst", tZONE, -HOUR(8) }, /* Singapore Standard */ + + /* Dubious (e.g., not in Olson's TIMEZONE package) or obsolete. */ + { "gst", tZONE, HOUR( 3) }, /* Greenland Standard */ + { "wat", tZONE, -HOUR(1) }, /* West Africa */ + { "at", tZONE, HOUR( 2) }, /* Azores */ + { "gst", tZONE, -HOUR(10) }, /* Guam Standard */ + { "nft", tZONE, HOUR(3)+30 }, /* Newfoundland */ + { "idlw", tZONE, HOUR(12) }, /* International Date Line West */ + { "mewt", tZONE, -HOUR(1) }, /* Middle European Winter */ + { "mest", tDAYZONE, -HOUR(1) }, /* Middle European Summer */ + { "swt", tZONE, -HOUR(1) }, /* Swedish Winter */ + { "sst", tDAYZONE, -HOUR(1) }, /* Swedish Summer */ + { "fwt", tZONE, -HOUR(1) }, /* French Winter */ + { "fst", tDAYZONE, -HOUR(1) }, /* French Summer */ + { "bt", tZONE, -HOUR(3) }, /* Baghdad */ + { "it", tZONE, -(HOUR(3)+30) }, /* Iran */ + { "zp4", tZONE, -HOUR(4) }, /* USSR Zone 3 */ + { "zp5", tZONE, -HOUR(5) }, /* USSR Zone 4 */ + { "ist", tZONE, -(HOUR(5)+30) }, /* Indian Standard */ + { "zp6", tZONE, -HOUR(6) }, /* USSR Zone 5 */ + { "nst", tZONE, -HOUR(7) }, /* North Sumatra */ + { "sst", tZONE, -HOUR(7) }, /* South Sumatra */ + { "jt", tZONE, -(HOUR(7)+30) }, /* Java (3pm in Cronusland!) */ + { "nzt", tZONE, -HOUR(12) }, /* New Zealand */ + { "idle", tZONE, -HOUR(12) }, /* International Date Line East */ + { "cat", tZONE, HOUR(10) }, /* -- expired 1967 */ + { "nt", tZONE, HOUR(11) }, /* -- expired 1967 */ + { "ahst", tZONE, HOUR(10) }, /* -- expired 1983 */ + { "hdt", tDAYZONE, HOUR(10) }, /* -- expired 1986 */ +#endif /* 0 */ +}; +/* *INDENT-ON* */ + +static time_t ToSeconds(time_t Hours, time_t Minutes, time_t Seconds, MERIDIAN Meridian) +{ + if (isBadTime(Minutes) || Minutes > 59 || isBadTime(Seconds) || Seconds > 61) + return BAD_TIME; + if (Meridian == MER24) { + if (isBadTime(Hours) || Hours > 23) + return BAD_TIME; + } else { + if (Hours < 1 || Hours > 12) + return BAD_TIME; + if (Hours == 12) + Hours = 0; + if (Meridian == MERpm) + Hours += 12; + } + return (Hours * 60L + Minutes) * 60L + Seconds; +} + +static time_t Convert(time_t Month, time_t Day, time_t Year, time_t Hours, + time_t Minutes, time_t Seconds, MERIDIAN Meridian, + DSTMODE dst) +{ + static const int DaysNormal[13] = + { + 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 + }; + static const int DaysLeap[13] = + { + 0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 + }; + /* *INDENT-OFF* */ + static const int LeapYears[] = + { + 1972, 1976, 1980, 1984, 1988, 1992, 1996, + 2000, 2004, 2008, 2012, 2016, 2020, 2024, 2028, 2032, 2036, + 2040, 2044, 2048, 2052, 2056, 2060, 2064, 2068, 2072, 2076, + 2080, 2084, 2088, 2092, 2096, /***/ 2104, 2108, 2112, 2116, + 2120, 2124, 2128, 2132, 2136, 2140, 2144, 2148, 2152, 2156, + 2160, 2164, 2168, 2172, 2176, 2180, 2184, 2188, 2192, 2196, + }; + /* *INDENT-ON* */ + + const int *yp; + const int *mp; + int i; + time_t Julian; + time_t tod; + + if (isBadTime(Year)) + Year = -Year; + if (Year < 70) + Year += 2000; + if (Year < 100) + Year += 1900; + if (Year < EPOCH) + Year += 100; + for (mp = DaysNormal, yp = LeapYears; yp < ENDOF(LeapYears); yp++) + if (Year == *yp) { + mp = DaysLeap; + break; + } + if (Year < EPOCH || Year > END_OF_TIME + || Month < 1 || Month > 12 + /* NOSTRICT */ + /* conversion from long may lose accuracy */ + || Day < 1 || Day > mp[(int) Month]) { + return BAD_TIME; + } + + Julian = Day - 1 + (Year - EPOCH) * 365; + for (yp = LeapYears; yp < ENDOF(LeapYears); yp++, Julian++) { + if (Year <= *yp) + break; + } + for (i = 1; i < Month; i++) + Julian += *++mp; + Julian *= SECSPERDAY; + Julian += yyTimezone * 60L; + tod = ToSeconds(Hours, Minutes, Seconds, Meridian); + if (isBadTime(tod)) { + return BAD_TIME; + } + Julian += tod; + tod = Julian; + if (dst == DSTon) { + Julian -= DST_OFFSET * 60 * 60; + } else if (dst == DSTmaybe) { + struct tm *tm = localtime(&tod); + + if (tm != NULL) { + if (tm->tm_isdst) + Julian -= DST_OFFSET * 60 * 60; + } else { + Julian = BAD_TIME; + } + } + return Julian; +} + +static time_t DSTcorrect(time_t Start, time_t Future) +{ + struct tm *tm; + time_t StartDay; + time_t FutureDay; + + if ((tm = localtime(&Start)) == NULL) + return BAD_TIME; + StartDay = (tm->tm_hour + 1) % 24; + + if ((tm = localtime(&Future)) == NULL) + return BAD_TIME; + FutureDay = (tm->tm_hour + 1) % 24; + + return (Future - Start) + (StartDay - FutureDay) * DST_OFFSET * 60 * 60; +} + +static time_t RelativeMonth(time_t Start, time_t RelMonth) +{ + struct tm *tm; + time_t Month; + time_t Year; + + if ((tm = localtime(&Start)) == NULL) + return BAD_TIME; + + Month = 12 * tm->tm_year + tm->tm_mon + RelMonth; + Year = Month / 12 + 1900; + Month = Month % 12 + 1; + return DSTcorrect(Start, + Convert(Month, (time_t) tm->tm_mday, Year, + (time_t) tm->tm_hour, (time_t) tm->tm_min, + (time_t) tm->tm_sec, + MER24, DSTmaybe)); +} + +static int LookupWord(char *buff, + int length) +{ + char *p; + const char *q; + const TABLE *tp; + int c; + + p = buff; + c = p[0]; + + /* See if we have an abbreviation for a month. */ + if (length == 3 || (length == 4 && p[3] == '.')) { + for (tp = MonthDayTable; tp < ENDOF(MonthDayTable); tp++) { + q = tp->name; + if (c == q[0] && p[1] == q[1] && p[2] == q[2]) { + yylval.Number = tp->value; + return tp->type; + } + } + } else { + for (tp = MonthDayTable; tp < ENDOF(MonthDayTable); tp++) { + if (c == tp->name[0] && strcmp(p, tp->name) == 0) { + yylval.Number = tp->value; + return tp->type; + } + } + } + + /* Try for a timezone. */ + for (tp = TimezoneTable; tp < ENDOF(TimezoneTable); tp++) { + if (c == tp->name[0] && p[1] == tp->name[1] + && strcmp(p, tp->name) == 0) { + yylval.Number = tp->value; + return tp->type; + } + } + + if (strcmp(buff, "dst") == 0) + return tDST; + + /* Try the units table. */ + for (tp = UnitsTable; tp < ENDOF(UnitsTable); tp++) { + if (c == tp->name[0] && strcmp(p, tp->name) == 0) { + yylval.Number = tp->value; + return tp->type; + } + } + + /* Strip off any plural and try the units table again. */ + if (--length > 0 && p[length] == 's') { + p[length] = '\0'; + for (tp = UnitsTable; tp < ENDOF(UnitsTable); tp++) { + if (c == tp->name[0] && strcmp(p, tp->name) == 0) { + p[length] = 's'; + yylval.Number = tp->value; + return tp->type; + } + } + p[length] = 's'; + } + length++; + + /* Drop out any periods. */ + for (p = buff, q = (PD_STRING) buff; *q; q++) { + if (*q != '.') + *p++ = *q; + } + *p = '\0'; + + /* Try the meridians. */ + if (buff[1] == 'm' && buff[2] == '\0') { + if (buff[0] == 'a') { + yylval.Meridian = MERam; + return tMERIDIAN; + } + if (buff[0] == 'p') { + yylval.Meridian = MERpm; + return tMERIDIAN; + } + } + + /* If we saw any periods, try the timezones again. */ + if (p - buff != length) { + c = buff[0]; + for (p = buff, tp = TimezoneTable; tp < ENDOF(TimezoneTable); tp++) { + if (c == tp->name[0] && p[1] == tp->name[1] + && strcmp(p, tp->name) == 0) { + yylval.Number = tp->value; + return tp->type; + } + } + } + + /* Unknown word -- assume GMT timezone. */ + yylval.Number = 0; + return tZONE; +} + +/* + * This returns characters as-is (the ones that are not part of some token), + * and codes greater than 256 (the token values). + * + * yacc generates tables that may use the character value. In particular, + * byacc's yycheck[] table contains integer values for the expected codes from + * this function, which (unless byacc is run locally) are ASCII codes. + * + * The TO_LOCAL() function assumes its input is in ASCII, and the output is + * whatever native encoding is used on the machine, e.g., EBCDIC. + * + * The TO_ASCII() function is the inverse of TO_LOCAL(). + */ +static int date_lex(void) +{ + int c; + char *p; + char buff[20]; + int sign; + int i; + int nesting; + + /* Get first character after the whitespace. */ + for (;;) { + while (CTYPE(isspace, *yyInput)) + yyInput++; + c = *yyInput; + + /* Ignore RFC 822 comments, typically time zone names. */ + if (c != LPAREN) + break; + for (nesting = 1; + (c = *++yyInput) != RPAREN || --nesting; + ) { + if (c == LPAREN) { + nesting++; + } else if (!IS7BIT(c) || c == '\0' || c == '\r' + || (c == '\\' + && ((c = *++yyInput) == '\0' + || !IS7BIT(c)))) { + /* Lexical error: bad comment. */ + return '?'; + } + } + yyInput++; + } + + /* A number? */ + if (CTYPE(isdigit, c) || c == '-' || c == '+') { + if (c == '-' || c == '+') { + sign = c == '-' ? -1 : 1; + yyInput++; + if (!CTYPE(isdigit, *yyInput)) { + /* Return the isolated plus or minus sign. */ + --yyInput; + return *yyInput++; + } + } else { + sign = 0; + } + for (p = buff; + (c = *yyInput++) != '\0' && CTYPE(isdigit, c); + ) { + if (p < &buff[sizeof buff - 1]) + *p++ = (char) c; + } + *p = '\0'; + i = atoi(buff); + + yyInput--; + yylval.Number = sign < 0 ? -i : i; + return sign ? tSNUMBER : tUNUMBER; + } + + /* A word? */ + if (CTYPE(isalpha, c)) { + for (p = buff; + (c = *yyInput++) == '.' || CTYPE(isalpha, c); + ) { + if (p < &buff[sizeof buff - 1]) + *p++ = (char) (CTYPE(isupper, c) ? tolower(c) : c); + } + *p = '\0'; + yyInput--; + return LookupWord(buff, (int) (p - buff)); + } + + return *yyInput++; +} + +static int GetTimeInfo(TIMEINFO * Now) +{ + static time_t LastTime; + static long LastTzone; + struct tm *tm; + +#if defined(HAVE_GETTIMEOFDAY) + struct timeval tv; +#endif /* defined(HAVE_GETTIMEOFDAY) */ +#if defined(DONT_HAVE_TM_GMTOFF) + struct tm local; + struct tm gmt; +#endif /* !defined(DONT_HAVE_TM_GMTOFF) */ + + /* Get the basic time. */ + memset(Now, 0, sizeof(TIMEINFO)); +#if defined(HAVE_GETTIMEOFDAY) + if (gettimeofday(&tv, (struct timezone *) NULL) == -1) + return -1; + Now->time = tv.tv_sec; + Now->usec = tv.tv_usec; +#else + /* Can't check for -1 since that might be a time, I guess. */ + (void) time(&Now->time); + Now->usec = 0; +#endif /* defined(HAVE_GETTIMEOFDAY) */ + + /* Now get the timezone if it's been an hour since the last time. */ + if (Now->time - LastTime > 60 * 60) { + LastTime = Now->time; + if ((tm = localtime(&Now->time)) == NULL) + return -1; +#if defined(DONT_HAVE_TM_GMTOFF) + /* To get the timezone, compare localtime with GMT. */ + local = *tm; + if ((tm = gmtime(&Now->time)) == NULL) + return -1; + gmt = *tm; + + /* Assume we are never more than 24 hours away. */ + LastTzone = gmt.tm_yday - local.tm_yday; + if (LastTzone > 1) + LastTzone = -24; + else if (LastTzone < -1) + LastTzone = 24; + else + LastTzone *= 24; + + /* Scale in the hours and minutes; ignore seconds. */ + LastTzone += gmt.tm_hour - local.tm_hour; + LastTzone *= 60; + LastTzone += gmt.tm_min - local.tm_min; +#else + LastTzone = (0 - tm->tm_gmtoff) / 60; +#endif /* defined(DONT_HAVE_TM_GMTOFF) */ + } + Now->tzone = LastTzone; + return 0; +} + +#if defined(YYBYACC) && defined(YYPURE) && defined(LY_FIND_LEAKS) +#undef YYPURE +#define YYPURE 1 +static void yyfreestack(YYSTACKDATA *); +static void parsedate_leaks(void) +{ + yyfreestack(&yystack); +} +#endif + +time_t parsedate(char *p, + TIMEINFO * now) +{ + struct tm *tm; + TIMEINFO ti; + time_t Start; + +#if defined(YYBYACC) && defined(YYPURE) && defined(LY_FIND_LEAKS) + static int initialized; + + if (!initialized) { + initialized = 1; + atexit(parsedate_leaks); + } +#endif + + yyInput = p; + if (now == NULL) { + now = &ti; + (void) GetTimeInfo(&ti); + } + + if ((tm = localtime(&now->time)) == NULL) + return BAD_TIME; + + /* *INDENT-EQLS* */ + yyYear = tm->tm_year + 1900; + yyMonth = tm->tm_mon + 1; + yyDay = tm->tm_mday; + yyTimezone = now->tzone; + if (tm->tm_isdst) /* Correct timezone offset for DST */ + yyTimezone += DST_OFFSET * 60; + yyDSTmode = DSTmaybe; + yyHour = 0; + yyMinutes = 0; + yySeconds = 0; + yyMeridian = MER24; + yyRelSeconds = 0; + yyRelMonth = 0; + yyHaveDate = 0; + yyHaveRel = 0; + yyHaveTime = 0; + + if (date_parse() || yyHaveTime > 1 || yyHaveDate > 1) + return BAD_TIME; + + if (yyHaveDate || yyHaveTime) { + Start = Convert(yyMonth, yyDay, yyYear, yyHour, yyMinutes, yySeconds, + yyMeridian, yyDSTmode); + if (isBadTime(Start)) + return BAD_TIME; + } else { + Start = now->time; + if (!yyHaveRel) + Start -= (tm->tm_hour * 60L + tm->tm_min) * 60L + tm->tm_sec; + } + + Start += yyRelSeconds; + if (yyRelMonth) + Start += RelativeMonth(Start, yyRelMonth); + + /* Have to do *something* with a legitimate -1 so it's distinguishable + * from the error return value. (Alternately could set errno on error.) */ + return (Start == BAD_TIME) ? 0 : Start; +} |