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Diffstat (limited to 'lib/getdate.y')
| -rw-r--r-- | lib/getdate.y | 1520 |
1 files changed, 0 insertions, 1520 deletions
diff --git a/lib/getdate.y b/lib/getdate.y deleted file mode 100644 index cbf3ca1..0000000 --- a/lib/getdate.y +++ /dev/null @@ -1,1520 +0,0 @@ -%{ -/* Parse a string into an internal time stamp. - - Copyright (C) 1999, 2000, 2002, 2003, 2004, 2005, 2006, 2007 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 2, 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, write to the Free Software Foundation, - Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ - -/* 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 "getdate.h" -#include "timespec.h" - -/* There's no need to extend the stack, so there's no need to involve - alloca. */ -#define YYSTACK_USE_ALLOCA 0 - -/* 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 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 <ctype.h> -#include <limits.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> - -#include "setenv.h" -#include "xalloc.h" - - -/* 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) - -#ifndef __attribute__ -# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__ -# define __attribute__(x) -# endif -#endif - -#ifndef ATTRIBUTE_UNUSED -# define ATTRIBUTE_UNUSED __attribute__ ((__unused__)) -#endif - -/* 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) - -/* 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; - long int seconds; - long int ns; -} relative_time; - -#if HAVE_COMPOUND_LITERALS -# define RELATIVE_TIME_0 ((relative_time) { 0, 0, 0, 0, 0, 0, 0 }) -#else -static relative_time const RELATIVE_TIME_0; -#endif - -/* 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 abbrevations, 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 (textint, long int); - -%} - -/* We want a reentrant parser, even if the TZ manipulation and the calls to - localtime and gmtime are not reentrant. */ -%pure-parser -%parse-param { parser_control *pc } -%lex-param { parser_control *pc } - -/* This grammar has 20 shift/reduce conflicts. */ -%expect 20 - -%union -{ - long int intval; - textint textintval; - struct timespec timespec; - relative_time rel; -} - -%token tAGO tDST - -%token tYEAR_UNIT tMONTH_UNIT tHOUR_UNIT tMINUTE_UNIT tSEC_UNIT -%token <intval> tDAY_UNIT - -%token <intval> tDAY tDAYZONE tLOCAL_ZONE tMERIDIAN -%token <intval> tMONTH tORDINAL tZONE - -%token <textintval> tSNUMBER tUNUMBER -%token <timespec> tSDECIMAL_NUMBER tUDECIMAL_NUMBER - -%type <intval> o_colon_minutes o_merid -%type <timespec> seconds signed_seconds unsigned_seconds - -%type <rel> relunit relunit_snumber - -%% - -spec: - timespec - | items - ; - -timespec: - '@' seconds - { - pc->seconds = $2; - pc->timespec_seen = true; - } - ; - -items: - /* empty */ - | items item - ; - -item: - time - { pc->times_seen++; } - | local_zone - { pc->local_zones_seen++; } - | zone - { pc->zones_seen++; } - | date - { pc->dates_seen++; } - | day - { pc->days_seen++; } - | rel - { pc->rels_seen = true; } - | number - ; - -time: - tUNUMBER tMERIDIAN - { - pc->hour = $1.value; - pc->minutes = 0; - pc->seconds.tv_sec = 0; - pc->seconds.tv_nsec = 0; - pc->meridian = $2; - } - | tUNUMBER ':' tUNUMBER o_merid - { - pc->hour = $1.value; - pc->minutes = $3.value; - pc->seconds.tv_sec = 0; - pc->seconds.tv_nsec = 0; - pc->meridian = $4; - } - | tUNUMBER ':' tUNUMBER tSNUMBER o_colon_minutes - { - pc->hour = $1.value; - pc->minutes = $3.value; - pc->seconds.tv_sec = 0; - pc->seconds.tv_nsec = 0; - pc->meridian = MER24; - pc->zones_seen++; - pc->time_zone = time_zone_hhmm ($4, $5); - } - | tUNUMBER ':' tUNUMBER ':' unsigned_seconds o_merid - { - pc->hour = $1.value; - pc->minutes = $3.value; - pc->seconds = $5; - pc->meridian = $6; - } - | tUNUMBER ':' tUNUMBER ':' unsigned_seconds tSNUMBER o_colon_minutes - { - pc->hour = $1.value; - pc->minutes = $3.value; - pc->seconds = $5; - pc->meridian = MER24; - pc->zones_seen++; - pc->time_zone = time_zone_hhmm ($6, $7); - } - ; - -local_zone: - tLOCAL_ZONE - { - pc->local_isdst = $1; - pc->dsts_seen += (0 < $1); - } - | tLOCAL_ZONE tDST - { - pc->local_isdst = 1; - pc->dsts_seen += (0 < $1) + 1; - } - ; - -zone: - tZONE - { pc->time_zone = $1; } - | tZONE relunit_snumber - { pc->time_zone = $1; - pc->rel.ns += $2.ns; - pc->rel.seconds += $2.seconds; - pc->rel.minutes += $2.minutes; - pc->rel.hour += $2.hour; - pc->rel.day += $2.day; - pc->rel.month += $2.month; - pc->rel.year += $2.year; - pc->rels_seen = true; } - | tZONE tSNUMBER o_colon_minutes - { pc->time_zone = $1 + time_zone_hhmm ($2, $3); } - | tDAYZONE - { pc->time_zone = $1 + 60; } - | tZONE tDST - { pc->time_zone = $1 + 60; } - ; - -day: - tDAY - { - pc->day_ordinal = 1; - pc->day_number = $1; - } - | tDAY ',' - { - pc->day_ordinal = 1; - pc->day_number = $1; - } - | tORDINAL tDAY - { - pc->day_ordinal = $1; - pc->day_number = $2; - } - | tUNUMBER tDAY - { - pc->day_ordinal = $1.value; - pc->day_number = $2; - } - ; - -date: - tUNUMBER '/' tUNUMBER - { - pc->month = $1.value; - pc->day = $3.value; - } - | tUNUMBER '/' tUNUMBER '/' tUNUMBER - { - /* 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 <= $1.digits) - { - pc->year = $1; - pc->month = $3.value; - pc->day = $5.value; - } - else - { - pc->month = $1.value; - pc->day = $3.value; - pc->year = $5; - } - } - | tUNUMBER tSNUMBER tSNUMBER - { - /* ISO 8601 format. YYYY-MM-DD. */ - pc->year = $1; - pc->month = -$2.value; - pc->day = -$3.value; - } - | tUNUMBER tMONTH tSNUMBER - { - /* e.g. 17-JUN-1992. */ - pc->day = $1.value; - pc->month = $2; - pc->year.value = -$3.value; - pc->year.digits = $3.digits; - } - | tMONTH tSNUMBER tSNUMBER - { - /* e.g. JUN-17-1992. */ - pc->month = $1; - pc->day = -$2.value; - pc->year.value = -$3.value; - pc->year.digits = $3.digits; - } - | tMONTH tUNUMBER - { - pc->month = $1; - pc->day = $2.value; - } - | tMONTH tUNUMBER ',' tUNUMBER - { - pc->month = $1; - pc->day = $2.value; - pc->year = $4; - } - | tUNUMBER tMONTH - { - pc->day = $1.value; - pc->month = $2; - } - | tUNUMBER tMONTH tUNUMBER - { - pc->day = $1.value; - pc->month = $2; - pc->year = $3; - } - ; - -rel: - relunit tAGO - { - pc->rel.ns -= $1.ns; - pc->rel.seconds -= $1.seconds; - pc->rel.minutes -= $1.minutes; - pc->rel.hour -= $1.hour; - pc->rel.day -= $1.day; - pc->rel.month -= $1.month; - pc->rel.year -= $1.year; - } - | relunit - { - pc->rel.ns += $1.ns; - pc->rel.seconds += $1.seconds; - pc->rel.minutes += $1.minutes; - pc->rel.hour += $1.hour; - pc->rel.day += $1.day; - pc->rel.month += $1.month; - pc->rel.year += $1.year; - } - ; - -relunit: - tORDINAL tYEAR_UNIT - { $$ = RELATIVE_TIME_0; $$.year = $1; } - | tUNUMBER tYEAR_UNIT - { $$ = RELATIVE_TIME_0; $$.year = $1.value; } - | tYEAR_UNIT - { $$ = RELATIVE_TIME_0; $$.year = 1; } - | tORDINAL tMONTH_UNIT - { $$ = RELATIVE_TIME_0; $$.month = $1; } - | tUNUMBER tMONTH_UNIT - { $$ = RELATIVE_TIME_0; $$.month = $1.value; } - | tMONTH_UNIT - { $$ = RELATIVE_TIME_0; $$.month = 1; } - | tORDINAL tDAY_UNIT - { $$ = RELATIVE_TIME_0; $$.day = $1 * $2; } - | tUNUMBER tDAY_UNIT - { $$ = RELATIVE_TIME_0; $$.day = $1.value * $2; } - | tDAY_UNIT - { $$ = RELATIVE_TIME_0; $$.day = $1; } - | tORDINAL tHOUR_UNIT - { $$ = RELATIVE_TIME_0; $$.hour = $1; } - | tUNUMBER tHOUR_UNIT - { $$ = RELATIVE_TIME_0; $$.hour = $1.value; } - | tHOUR_UNIT - { $$ = RELATIVE_TIME_0; $$.hour = 1; } - | tORDINAL tMINUTE_UNIT - { $$ = RELATIVE_TIME_0; $$.minutes = $1; } - | tUNUMBER tMINUTE_UNIT - { $$ = RELATIVE_TIME_0; $$.minutes = $1.value; } - | tMINUTE_UNIT - { $$ = RELATIVE_TIME_0; $$.minutes = 1; } - | tORDINAL tSEC_UNIT - { $$ = RELATIVE_TIME_0; $$.seconds = $1; } - | tUNUMBER tSEC_UNIT - { $$ = RELATIVE_TIME_0; $$.seconds = $1.value; } - | tSDECIMAL_NUMBER tSEC_UNIT - { $$ = RELATIVE_TIME_0; $$.seconds = $1.tv_sec; $$.ns = $1.tv_nsec; } - | tUDECIMAL_NUMBER tSEC_UNIT - { $$ = RELATIVE_TIME_0; $$.seconds = $1.tv_sec; $$.ns = $1.tv_nsec; } - | tSEC_UNIT - { $$ = RELATIVE_TIME_0; $$.seconds = 1; } - | relunit_snumber - ; - -relunit_snumber: - tSNUMBER tYEAR_UNIT - { $$ = RELATIVE_TIME_0; $$.year = $1.value; } - | tSNUMBER tMONTH_UNIT - { $$ = RELATIVE_TIME_0; $$.month = $1.value; } - | tSNUMBER tDAY_UNIT - { $$ = RELATIVE_TIME_0; $$.day = $1.value * $2; } - | tSNUMBER tHOUR_UNIT - { $$ = RELATIVE_TIME_0; $$.hour = $1.value; } - | tSNUMBER tMINUTE_UNIT - { $$ = RELATIVE_TIME_0; $$.minutes = $1.value; } - | tSNUMBER tSEC_UNIT - { $$ = RELATIVE_TIME_0; $$.seconds = $1.value; } - ; - -seconds: signed_seconds | unsigned_seconds; - -signed_seconds: - tSDECIMAL_NUMBER - | tSNUMBER - { $$.tv_sec = $1.value; $$.tv_nsec = 0; } - ; - -unsigned_seconds: - tUDECIMAL_NUMBER - | tUNUMBER - { $$.tv_sec = $1.value; $$.tv_nsec = 0; } - ; - -number: - tUNUMBER - { - if (pc->dates_seen && ! pc->year.digits - && ! pc->rels_seen && (pc->times_seen || 2 < $1.digits)) - pc->year = $1; - else - { - if (4 < $1.digits) - { - pc->dates_seen++; - pc->day = $1.value % 100; - pc->month = ($1.value / 100) % 100; - pc->year.value = $1.value / 10000; - pc->year.digits = $1.digits - 4; - } - else - { - pc->times_seen++; - if ($1.digits <= 2) - { - pc->hour = $1.value; - pc->minutes = 0; - } - else - { - pc->hour = $1.value / 100; - pc->minutes = $1.value % 100; - } - pc->seconds.tv_sec = 0; - pc->seconds.tv_nsec = 0; - pc->meridian = MER24; - } - } - } - ; - -o_colon_minutes: - /* empty */ - { $$ = -1; } - | ':' tUNUMBER - { $$ = $2.value; } - ; - -o_merid: - /* empty */ - { $$ = MER24; } - | tMERIDIAN - { $$ = $1; } - ; - -%% - -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_UNIT, 1 }, - { "YESTERDAY",tDAY_UNIT, -1 }, - { "TODAY", tDAY_UNIT, 0 }, - { "NOW", tDAY_UNIT, 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 }, - { 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 getdate 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. */ -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", 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 } -}; - - - -/* 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. */ - -static long int -time_zone_hhmm (textint s, long int mm) -{ - if (mm < 0) - return (s.value / 100) * 60 + s.value % 100; - else - return s.value * 60 + (s.negative ? -mm : mm); -} - -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 -/* 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 (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 *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 ATTRIBUTE_UNUSED, - char const *s ATTRIBUTE_UNUSED) -{ - 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 - ? 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 -get_date (struct timespec *result, char const *p, struct timespec const *now) -{ - time_t Start; - long int Start_ns; - struct tm const *tmp; - struct tm tm; - struct tm tm0; - 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 ? xmalloc (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; - } - } - - 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 - { -# ifndef 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 abbrevation 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_isdst = -1; - Start = mktime (&tm); - if (Start == (time_t) -1) - goto fail; - } - - 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 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; - } - - /* 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; - long int d3 = pc.rel.seconds; - time_t t3 = t2 + d3; - long int d4 = (sum_ns - normalized_ns) / BILLION; - time_t t4 = t3 + d4; - - 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))) - goto fail; - - result->tv_sec = t4; - 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; -} - -#if TEST - -int -main (int ac, char **av) -{ - char buff[BUFSIZ]; - - printf ("Enter date, or blank line to exit.\n\t> "); - fflush (stdout); - - buff[BUFSIZ - 1] = '\0'; - while (fgets (buff, BUFSIZ - 1, stdin) && buff[0]) - { - struct timespec d; - struct tm const *tm; - if (! get_date (&d, buff, NULL)) - printf ("Bad format - couldn't convert.\n"); - else if (! (tm = localtime (&d.tv_sec))) - { - long int sec = d.tv_sec; - printf ("localtime (%ld) failed\n", sec); - } - else - { - int ns = d.tv_nsec; - printf ("%04ld-%02d-%02d %02d:%02d:%02d.%09d\n", - tm->tm_year + 1900L, tm->tm_mon + 1, tm->tm_mday, - tm->tm_hour, tm->tm_min, tm->tm_sec, ns); - } - printf ("\t> "); - fflush (stdout); - } - return 0; -} -#endif /* TEST */ |