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Diffstat (limited to 'source/modules/getdate.y')
| -rw-r--r-- | source/modules/getdate.y | 1115 |
1 files changed, 0 insertions, 1115 deletions
diff --git a/source/modules/getdate.y b/source/modules/getdate.y deleted file mode 100644 index aab37f4d235..00000000000 --- a/source/modules/getdate.y +++ /dev/null @@ -1,1115 +0,0 @@ -%{ -/* Parse a string into an internal time stamp. - Copyright (C) 1999, 2000, 2002 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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. Unlike previous versions, this - version is reentrant. */ - -#ifdef HAVE_CONFIG_H -# include <config.h> -# ifdef HAVE_ALLOCA_H -# include <alloca.h> -# endif -#endif - -/* Since the code of getdate.y is not included in the Emacs executable - itself, there is no need to #define static in this file. Even if - the code were included in the Emacs executable, it probably - wouldn't do any harm to #undef it here; this will only cause - problems if we try to write to a static variable, which I don't - think this code needs to do. */ -#ifdef emacs -# undef static -#endif - -#include <ctype.h> - -#if HAVE_STDLIB_H -# include <stdlib.h> /* for `free'; used by Bison 1.27 */ -#endif - -#if STDC_HEADERS || (! defined isascii && ! HAVE_ISASCII) -# define IN_CTYPE_DOMAIN(c) 1 -#else -# define IN_CTYPE_DOMAIN(c) isascii (c) -#endif - -#define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (c)) -#define ISALPHA(c) (IN_CTYPE_DOMAIN (c) && isalpha (c)) -#define ISLOWER(c) (IN_CTYPE_DOMAIN (c) && islower (c)) -#define ISDIGIT_LOCALE(c) (IN_CTYPE_DOMAIN (c) && isdigit (c)) - -/* ISDIGIT differs from ISDIGIT_LOCALE, as follows: - - Its arg may be any int or unsigned int; it need not be an unsigned char. - - It's guaranteed to evaluate its argument exactly once. - - It's typically faster. - POSIX says that only '0' through '9' are digits. Prefer ISDIGIT to - ISDIGIT_LOCALE unless it's important to use the locale's definition - of `digit' even when the host does not conform to POSIX. */ -#define ISDIGIT(c) ((unsigned) (c) - '0' <= 9) - -#if STDC_HEADERS || HAVE_STRING_H -# include <string.h> -#endif - -#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__ -# define __attribute__(x) -#endif - -#ifndef ATTRIBUTE_UNUSED -# define ATTRIBUTE_UNUSED __attribute__ ((__unused__)) -#endif - -#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 -{ - int value; - int 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 }; - -/* 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. */ - 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. */ - int time_zone; - - /* Style used for time. */ - int meridian; - - /* Gregorian year, month, day, hour, minutes, and seconds. */ - textint year; - int month; - int day; - int hour; - int minutes; - int seconds; - - /* Relative year, month, day, hour, minutes, and seconds. */ - int rel_year; - int rel_month; - int rel_day; - int rel_hour; - int rel_minutes; - int rel_seconds; - - /* Counts of nonterminals of various flavors parsed so far. */ - int dates_seen; - int days_seen; - int local_zones_seen; - int rels_seen; - int times_seen; - int zones_seen; - - /* Table of local time zone abbrevations, terminated by a null entry. */ - table local_time_zone_table[3]; -} parser_control; - -#define PC (* (parser_control *) parm) -#define YYLEX_PARAM parm -#define YYPARSE_PARAM parm - -static int yyerror (); -static int yylex (); - -%} - -/* We want a reentrant parser. */ -%pure_parser - -/* This grammar has 13 shift/reduce conflicts. */ -%expect 13 - -%union -{ - int intval; - textint textintval; -} - -%token tAGO tDST - -%token <intval> tDAY tDAY_UNIT tDAYZONE tHOUR_UNIT tLOCAL_ZONE tMERIDIAN -%token <intval> tMINUTE_UNIT tMONTH tMONTH_UNIT tSEC_UNIT tYEAR_UNIT tZONE - -%token <textintval> tSNUMBER tUNUMBER - -%type <intval> o_merid - -%% - -spec: - /* empty */ - | spec 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++; } - | number - ; - -time: - tUNUMBER tMERIDIAN - { - PC.hour = $1.value; - PC.minutes = 0; - PC.seconds = 0; - PC.meridian = $2; - } - | tUNUMBER ':' tUNUMBER o_merid - { - PC.hour = $1.value; - PC.minutes = $3.value; - PC.seconds = 0; - PC.meridian = $4; - } - | tUNUMBER ':' tUNUMBER tSNUMBER - { - PC.hour = $1.value; - PC.minutes = $3.value; - PC.meridian = MER24; - PC.zones_seen++; - PC.time_zone = $4.value % 100 + ($4.value / 100) * 60; - } - | tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid - { - PC.hour = $1.value; - PC.minutes = $3.value; - PC.seconds = $5.value; - PC.meridian = $6; - } - | tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER - { - PC.hour = $1.value; - PC.minutes = $3.value; - PC.seconds = $5.value; - PC.meridian = MER24; - PC.zones_seen++; - PC.time_zone = $6.value % 100 + ($6.value / 100) * 60; - } - ; - -local_zone: - tLOCAL_ZONE - { PC.local_isdst = $1; } - | tLOCAL_ZONE tDST - { PC.local_isdst = $1 < 0 ? 1 : $1 + 1; } - ; - -zone: - tZONE - { PC.time_zone = $1; } - | 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; - } - | 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 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_seconds = -PC.rel_seconds; - PC.rel_minutes = -PC.rel_minutes; - PC.rel_hour = -PC.rel_hour; - PC.rel_day = -PC.rel_day; - PC.rel_month = -PC.rel_month; - PC.rel_year = -PC.rel_year; - } - | relunit - ; - -relunit: - tUNUMBER tYEAR_UNIT - { PC.rel_year += $1.value * $2; } - | tSNUMBER tYEAR_UNIT - { PC.rel_year += $1.value * $2; } - | tYEAR_UNIT - { PC.rel_year += $1; } - | tUNUMBER tMONTH_UNIT - { PC.rel_month += $1.value * $2; } - | tSNUMBER tMONTH_UNIT - { PC.rel_month += $1.value * $2; } - | tMONTH_UNIT - { PC.rel_month += $1; } - | tUNUMBER tDAY_UNIT - { PC.rel_day += $1.value * $2; } - | tSNUMBER tDAY_UNIT - { PC.rel_day += $1.value * $2; } - | tDAY_UNIT - { PC.rel_day += $1; } - | tUNUMBER tHOUR_UNIT - { PC.rel_hour += $1.value * $2; } - | tSNUMBER tHOUR_UNIT - { PC.rel_hour += $1.value * $2; } - | tHOUR_UNIT - { PC.rel_hour += $1; } - | tUNUMBER tMINUTE_UNIT - { PC.rel_minutes += $1.value * $2; } - | tSNUMBER tMINUTE_UNIT - { PC.rel_minutes += $1.value * $2; } - | tMINUTE_UNIT - { PC.rel_minutes += $1; } - | tUNUMBER tSEC_UNIT - { PC.rel_seconds += $1.value * $2; } - | tSNUMBER tSEC_UNIT - { PC.rel_seconds += $1.value * $2; } - | tSEC_UNIT - { PC.rel_seconds += $1; } - ; - -number: - tUNUMBER - { - if (PC.dates_seen - && ! 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 = 0; - PC.meridian = MER24; - } - } - } - ; - -o_merid: - /* empty */ - { $$ = MER24; } - | tMERIDIAN - { $$ = $1; } - ; - -%% - -/* Include this file down here because bison inserts code above which - may define-away `const'. We want the prototype for get_date to have - the same signature as the function definition. */ -#include "modules/getdate.h" - -#ifndef gmtime -struct tm *gmtime (); -#endif -#ifndef localtime -struct tm *localtime (); -#endif -#ifndef mktime -time_t mktime (); -#endif - -static table const meridian_table[] = -{ - { "AM", tMERIDIAN, MERam }, - { "A.M.", tMERIDIAN, MERam }, - { "PM", tMERIDIAN, MERpm }, - { "P.M.", tMERIDIAN, MERpm }, - { 0, 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 }, - { 0, 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 }, - { 0, 0, 0 } -}; - -/* Assorted relative-time words. */ -static table const relative_time_table[] = -{ - { "TOMORROW", tMINUTE_UNIT, 24 * 60 }, - { "YESTERDAY",tMINUTE_UNIT, - (24 * 60) }, - { "TODAY", tMINUTE_UNIT, 0 }, - { "NOW", tMINUTE_UNIT, 0 }, - { "LAST", tUNUMBER, -1 }, - { "THIS", tUNUMBER, 0 }, - { "NEXT", tUNUMBER, 1 }, - { "FIRST", tUNUMBER, 1 }, -/*{ "SECOND", tUNUMBER, 2 }, */ - { "THIRD", tUNUMBER, 3 }, - { "FOURTH", tUNUMBER, 4 }, - { "FIFTH", tUNUMBER, 5 }, - { "SIXTH", tUNUMBER, 6 }, - { "SEVENTH", tUNUMBER, 7 }, - { "EIGHTH", tUNUMBER, 8 }, - { "NINTH", tUNUMBER, 9 }, - { "TENTH", tUNUMBER, 10 }, - { "ELEVENTH", tUNUMBER, 11 }, - { "TWELFTH", tUNUMBER, 12 }, - { "AGO", tAGO, 1 }, - { 0, 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[] = -{ - { "GMT", tZONE, HOUR ( 0) }, /* Greenwich Mean */ - { "UT", tZONE, HOUR ( 0) }, /* Universal (Coordinated) */ - { "UTC", tZONE, HOUR ( 0) }, - { "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 */ - { 0, 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) }, - { 0, 0, 0 } -}; - - - -static int -to_hour (int hours, int meridian) -{ - switch (meridian) - { - 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; - default: - abort (); - } - /* NOTREACHED */ - return 0; -} - -static int -to_year (textint textyear) -{ - 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. */ - 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; - - /* Try local zone abbreviations first; they're 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 0; -} - -#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 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, - but it's OK to assume that A and B are close to each other. */ - int a4 = (a->tm_year >> 2) + (TM_YEAR_BASE >> 2) - ! (a->tm_year & 3); - int b4 = (b->tm_year >> 2) + (TM_YEAR_BASE >> 2) - ! (b->tm_year & 3); - int a100 = a4 / 25 - (a4 % 25 < 0); - int b100 = b4 / 25 - (b4 % 25 < 0); - int a400 = a100 >> 2; - int b400 = b100 >> 2; - int intervening_leap_days = (a4 - b4) - (a100 - b100) + (a400 - b400); - int years = a->tm_year - b->tm_year; - 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; - int i; - int abbrev; - - /* Make it uppercase. */ - for (p = word; *p; p++) - if (ISLOWER ((unsigned char) *p)) - *p = toupper ((unsigned char) *p); - - 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 (i = 0, p = q = word; (*p = *q); q++) - if (*q == '.') - i = 1; - else - p++; - if (i && (tp = lookup_zone (pc, word))) - return tp; - - return 0; -} - -static int -yylex (YYSTYPE *lvalp, parser_control *pc) -{ - unsigned char c; - int count; - - for (;;) - { - while (c = *pc->input, ISSPACE (c)) - pc->input++; - - if (ISDIGIT (c) || c == '-' || c == '+') - { - char const *p; - int sign; - int value; - if (c == '-' || c == '+') - { - sign = c == '-' ? -1 : 1; - c = *++pc->input; - if (! ISDIGIT (c)) - /* skip the '-' sign */ - continue; - } - else - sign = 0; - p = pc->input; - value = 0; - do - { - value = 10 * value + c - '0'; - c = *++p; - } - while (ISDIGIT (c)); - lvalp->textintval.value = sign < 0 ? -value : value; - 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 (char *s ATTRIBUTE_UNUSED) -{ - return 0; -} - -/* Parse a date/time string P. Return the corresponding time_t value, - or (time_t) -1 if there is an error. P can be an incomplete or - relative time specification; if so, use *NOW as the basis for the - returned time. */ -time_t -get_date (const char *p, const time_t *now) -{ - time_t Start = now ? *now : time (0); - struct tm *tmp = localtime (&Start); - struct tm tm; - struct tm tm0; - parser_control pc; - - if (! tmp) - return -1; - - pc.input = p; - pc.year.value = tmp->tm_year + TM_YEAR_BASE; - pc.year.digits = 4; - pc.month = tmp->tm_mon + 1; - pc.day = tmp->tm_mday; - pc.hour = tmp->tm_hour; - pc.minutes = tmp->tm_min; - pc.seconds = tmp->tm_sec; - tm.tm_isdst = tmp->tm_isdst; - - pc.meridian = MER24; - pc.rel_seconds = 0; - pc.rel_minutes = 0; - pc.rel_hour = 0; - pc.rel_day = 0; - pc.rel_month = 0; - pc.rel_year = 0; - pc.dates_seen = 0; - pc.days_seen = 0; - pc.rels_seen = 0; - pc.times_seen = 0; - pc.local_zones_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 = 0; - - /* 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 *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 = 0; - } - 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 = 0; - } -#else - pc.local_time_zone_table[0].name = 0; -#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 = 0; - } - - if (yyparse (&pc) != 0 - || 1 < pc.times_seen || 1 < pc.dates_seen || 1 < pc.days_seen - || 1 < (pc.local_zones_seen + pc.zones_seen) - || (pc.local_zones_seen && 1 < pc.local_isdst)) - return -1; - - tm.tm_year = to_year (pc.year) - TM_YEAR_BASE + pc.rel_year; - tm.tm_mon = pc.month - 1 + pc.rel_month; - tm.tm_mday = pc.day + pc.rel_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) - return -1; - tm.tm_min = pc.minutes; - tm.tm_sec = pc.seconds; - } - else - { - tm.tm_hour = tm.tm_min = tm.tm_sec = 0; - } - - /* Let mktime deduce tm_isdst if we have an absolute time stamp, - or if the relative time stamp mentions days, months, or years. */ - if (pc.dates_seen | pc.days_seen | pc.times_seen | pc.rel_day - | pc.rel_month | pc.rel_year) - 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 (Start == (time_t) -1) - { - - /* Guard against falsely reporting errors near the time_t boundaries - when parsing times in other time zones. For example, if the min - time_t value is 1970-01-01 00:00:00 UTC and we are 8 hours ahead - of UTC, then the min localtime value is 1970-01-01 08:00:00; if - we apply mktime to 1970-01-01 00:00:00 we will get an error, so - we apply mktime to 1970-01-02 08:00:00 instead and adjust the time - zone by 24 hours to compensate. This algorithm assumes that - there is no DST transition within a day of the time_t boundaries. */ - if (pc.zones_seen) - { - tm = tm0; - if (tm.tm_year <= EPOCH_YEAR - TM_YEAR_BASE) - { - tm.tm_mday++; - pc.time_zone += 24 * 60; - } - else - { - tm.tm_mday--; - pc.time_zone -= 24 * 60; - } - Start = mktime (&tm); - } - - if (Start == (time_t) -1) - return Start; - } - - 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) - return Start; - } - - if (pc.zones_seen) - { - int delta = pc.time_zone * 60; -#ifdef HAVE_TM_GMTOFF - delta -= tm.tm_gmtoff; -#else - struct tm *gmt = gmtime (&Start); - if (! gmt) - return -1; - delta -= tm_diff (&tm, gmt); -#endif - if ((Start < Start - delta) != (delta < 0)) - return -1; /* time_t overflow */ - Start -= delta; - } - - /* Add relative hours, minutes, and seconds. Ignore leap seconds; - i.e. "+ 10 minutes" means 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. */ - { - time_t t0 = Start; - long d1 = 60 * 60 * (long) pc.rel_hour; - time_t t1 = t0 + d1; - long d2 = 60 * (long) pc.rel_minutes; - time_t t2 = t1 + d2; - int d3 = pc.rel_seconds; - time_t t3 = t2 + d3; - if ((d1 / (60 * 60) ^ pc.rel_hour) - | (d2 / 60 ^ pc.rel_minutes) - | ((t0 + d1 < t0) ^ (d1 < 0)) - | ((t1 + d2 < t1) ^ (d2 < 0)) - | ((t2 + d3 < t2) ^ (d3 < 0))) - return -1; - Start = t3; - } - - return Start; -} - -#if TEST - -#include <stdio.h> - -int -main (int ac, char **av) -{ - char buff[BUFSIZ]; - time_t d; - - printf ("Enter date, or blank line to exit.\n\t> "); - fflush (stdout); - - buff[BUFSIZ - 1] = 0; - while (fgets (buff, BUFSIZ - 1, stdin) && buff[0]) - { - d = get_date (buff, 0); - if (d == (time_t) -1) - printf ("Bad format - couldn't convert.\n"); - else - printf ("%s", ctime (&d)); - printf ("\t> "); - fflush (stdout); - } - return 0; -} -#endif /* defined TEST */ |