mirror of
https://github.com/coreutils/coreutils.git
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1116 lines
28 KiB
Plaintext
1116 lines
28 KiB
Plaintext
%{
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||
/* Parse a string into an internal time stamp.
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Copyright (C) 1999, 2000, 2002 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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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.
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||
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
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||
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||
You should have received a copy of the GNU General Public License
|
||
along with this program; if not, write to the Free Software Foundation,
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||
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* Originally written by Steven M. Bellovin <smb@research.att.com> while
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at the University of North Carolina at Chapel Hill. Later tweaked by
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a couple of people on Usenet. Completely overhauled by Rich $alz
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<rsalz@bbn.com> and Jim Berets <jberets@bbn.com> in August, 1990.
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Modified by Paul Eggert <eggert@twinsun.com> in August 1999 to do
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the right thing about local DST. Unlike previous versions, this
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version is reentrant. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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# ifdef HAVE_ALLOCA_H
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# include <alloca.h>
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# endif
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#endif
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/* Since the code of getdate.y is not included in the Emacs executable
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itself, there is no need to #define static in this file. Even if
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the code were included in the Emacs executable, it probably
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wouldn't do any harm to #undef it here; this will only cause
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problems if we try to write to a static variable, which I don't
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think this code needs to do. */
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#ifdef emacs
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# undef static
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#endif
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#include <ctype.h>
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#if HAVE_STDLIB_H
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# include <stdlib.h> /* for `free'; used by Bison 1.27 */
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#endif
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#if STDC_HEADERS || (! defined isascii && ! HAVE_ISASCII)
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# define IN_CTYPE_DOMAIN(c) 1
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#else
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# define IN_CTYPE_DOMAIN(c) isascii (c)
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#endif
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#define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (c))
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#define ISALPHA(c) (IN_CTYPE_DOMAIN (c) && isalpha (c))
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#define ISLOWER(c) (IN_CTYPE_DOMAIN (c) && islower (c))
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#define ISDIGIT_LOCALE(c) (IN_CTYPE_DOMAIN (c) && isdigit (c))
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/* ISDIGIT differs from ISDIGIT_LOCALE, as follows:
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- Its arg may be any int or unsigned int; it need not be an unsigned char.
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- It's guaranteed to evaluate its argument exactly once.
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- It's typically faster.
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POSIX says that only '0' through '9' are digits. Prefer ISDIGIT to
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ISDIGIT_LOCALE unless it's important to use the locale's definition
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of `digit' even when the host does not conform to POSIX. */
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#define ISDIGIT(c) ((unsigned) (c) - '0' <= 9)
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#if STDC_HEADERS || HAVE_STRING_H
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# include <string.h>
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#endif
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#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__
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# define __attribute__(x)
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#endif
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#ifndef ATTRIBUTE_UNUSED
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# define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
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#endif
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#define EPOCH_YEAR 1970
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#define TM_YEAR_BASE 1900
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#define HOUR(x) ((x) * 60)
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/* An integer value, and the number of digits in its textual
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representation. */
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typedef struct
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{
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int value;
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int digits;
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} textint;
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/* An entry in the lexical lookup table. */
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typedef struct
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{
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char const *name;
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int type;
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int value;
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} table;
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/* Meridian: am, pm, or 24-hour style. */
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enum { MERam, MERpm, MER24 };
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/* Information passed to and from the parser. */
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typedef struct
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{
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/* The input string remaining to be parsed. */
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const char *input;
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/* N, if this is the Nth Tuesday. */
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int day_ordinal;
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/* Day of week; Sunday is 0. */
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int day_number;
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/* tm_isdst flag for the local zone. */
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int local_isdst;
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/* Time zone, in minutes east of UTC. */
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int time_zone;
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/* Style used for time. */
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int meridian;
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/* Gregorian year, month, day, hour, minutes, and seconds. */
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textint year;
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int month;
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int day;
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int hour;
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int minutes;
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int seconds;
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/* Relative year, month, day, hour, minutes, and seconds. */
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int rel_year;
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int rel_month;
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int rel_day;
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int rel_hour;
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int rel_minutes;
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int rel_seconds;
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/* Counts of nonterminals of various flavors parsed so far. */
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int dates_seen;
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int days_seen;
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int local_zones_seen;
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int rels_seen;
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int times_seen;
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int zones_seen;
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/* Table of local time zone abbrevations, terminated by a null entry. */
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table local_time_zone_table[3];
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} parser_control;
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#define PC (* (parser_control *) parm)
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#define YYLEX_PARAM parm
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#define YYPARSE_PARAM parm
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static int yyerror ();
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static int yylex ();
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%}
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/* We want a reentrant parser. */
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%pure_parser
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/* This grammar has 13 shift/reduce conflicts. */
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%expect 13
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%union
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{
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int intval;
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textint textintval;
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}
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%token tAGO tDST
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%token <intval> tDAY tDAY_UNIT tDAYZONE tHOUR_UNIT tLOCAL_ZONE tMERIDIAN
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%token <intval> tMINUTE_UNIT tMONTH tMONTH_UNIT tSEC_UNIT tYEAR_UNIT tZONE
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%token <textintval> tSNUMBER tUNUMBER
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%type <intval> o_merid
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%%
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spec:
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/* empty */
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| spec item
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;
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item:
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time
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{ PC.times_seen++; }
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| local_zone
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{ PC.local_zones_seen++; }
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| zone
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{ PC.zones_seen++; }
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| date
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{ PC.dates_seen++; }
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| day
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{ PC.days_seen++; }
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| rel
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{ PC.rels_seen++; }
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| number
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;
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time:
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tUNUMBER tMERIDIAN
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{
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PC.hour = $1.value;
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PC.minutes = 0;
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PC.seconds = 0;
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PC.meridian = $2;
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}
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| tUNUMBER ':' tUNUMBER o_merid
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{
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PC.hour = $1.value;
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PC.minutes = $3.value;
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PC.seconds = 0;
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PC.meridian = $4;
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}
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| tUNUMBER ':' tUNUMBER tSNUMBER
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{
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PC.hour = $1.value;
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PC.minutes = $3.value;
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PC.meridian = MER24;
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PC.zones_seen++;
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PC.time_zone = $4.value % 100 + ($4.value / 100) * 60;
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}
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| tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid
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{
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PC.hour = $1.value;
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PC.minutes = $3.value;
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PC.seconds = $5.value;
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PC.meridian = $6;
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}
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| tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER
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{
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PC.hour = $1.value;
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PC.minutes = $3.value;
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PC.seconds = $5.value;
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PC.meridian = MER24;
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PC.zones_seen++;
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PC.time_zone = $6.value % 100 + ($6.value / 100) * 60;
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}
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;
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local_zone:
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tLOCAL_ZONE
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{ PC.local_isdst = $1; }
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| tLOCAL_ZONE tDST
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{ PC.local_isdst = $1 < 0 ? 1 : $1 + 1; }
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;
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zone:
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tZONE
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{ PC.time_zone = $1; }
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| tDAYZONE
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{ PC.time_zone = $1 + 60; }
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| tZONE tDST
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{ PC.time_zone = $1 + 60; }
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;
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day:
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tDAY
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{
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PC.day_ordinal = 1;
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PC.day_number = $1;
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}
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| tDAY ','
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{
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PC.day_ordinal = 1;
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PC.day_number = $1;
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}
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| tUNUMBER tDAY
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{
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PC.day_ordinal = $1.value;
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PC.day_number = $2;
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}
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;
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date:
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tUNUMBER '/' tUNUMBER
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{
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PC.month = $1.value;
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PC.day = $3.value;
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}
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| tUNUMBER '/' tUNUMBER '/' tUNUMBER
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{
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/* Interpret as YYYY/MM/DD if the first value has 4 or more digits,
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otherwise as MM/DD/YY.
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The goal in recognizing YYYY/MM/DD is solely to support legacy
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machine-generated dates like those in an RCS log listing. If
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you want portability, use the ISO 8601 format. */
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if (4 <= $1.digits)
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{
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PC.year = $1;
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PC.month = $3.value;
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PC.day = $5.value;
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}
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else
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{
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PC.month = $1.value;
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PC.day = $3.value;
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PC.year = $5;
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}
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}
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| tUNUMBER tSNUMBER tSNUMBER
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{
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/* ISO 8601 format. YYYY-MM-DD. */
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PC.year = $1;
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PC.month = -$2.value;
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PC.day = -$3.value;
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}
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| tUNUMBER tMONTH tSNUMBER
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{
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/* e.g. 17-JUN-1992. */
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PC.day = $1.value;
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PC.month = $2;
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PC.year.value = -$3.value;
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PC.year.digits = $3.digits;
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}
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| tMONTH tUNUMBER
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{
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PC.month = $1;
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PC.day = $2.value;
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}
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| tMONTH tUNUMBER ',' tUNUMBER
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{
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PC.month = $1;
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PC.day = $2.value;
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PC.year = $4;
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}
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| tUNUMBER tMONTH
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{
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PC.day = $1.value;
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PC.month = $2;
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}
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| tUNUMBER tMONTH tUNUMBER
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{
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PC.day = $1.value;
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PC.month = $2;
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PC.year = $3;
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}
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;
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rel:
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relunit tAGO
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{
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PC.rel_seconds = -PC.rel_seconds;
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PC.rel_minutes = -PC.rel_minutes;
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PC.rel_hour = -PC.rel_hour;
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PC.rel_day = -PC.rel_day;
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PC.rel_month = -PC.rel_month;
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PC.rel_year = -PC.rel_year;
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}
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| relunit
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;
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relunit:
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tUNUMBER tYEAR_UNIT
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{ PC.rel_year += $1.value * $2; }
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| tSNUMBER tYEAR_UNIT
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{ PC.rel_year += $1.value * $2; }
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| tYEAR_UNIT
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{ PC.rel_year += $1; }
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| tUNUMBER tMONTH_UNIT
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{ PC.rel_month += $1.value * $2; }
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| tSNUMBER tMONTH_UNIT
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{ PC.rel_month += $1.value * $2; }
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| tMONTH_UNIT
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{ PC.rel_month += $1; }
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| tUNUMBER tDAY_UNIT
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{ PC.rel_day += $1.value * $2; }
|
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| tSNUMBER tDAY_UNIT
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{ PC.rel_day += $1.value * $2; }
|
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| tDAY_UNIT
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{ PC.rel_day += $1; }
|
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| tUNUMBER tHOUR_UNIT
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{ PC.rel_hour += $1.value * $2; }
|
||
| tSNUMBER tHOUR_UNIT
|
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{ PC.rel_hour += $1.value * $2; }
|
||
| tHOUR_UNIT
|
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{ PC.rel_hour += $1; }
|
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| tUNUMBER tMINUTE_UNIT
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{ 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; }
|
||
;
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||
|
||
number:
|
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tUNUMBER
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{
|
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if (PC.dates_seen
|
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&& ! 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 "getdate.h"
|
||
#include "unlocked-io.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 */
|
||
}
|
||
|
||
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 */
|