mirror of
https://github.com/coreutils/coreutils.git
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0971b8d8a9
the command "date -d'2005-03-27 +1 day'" succeeds once again, even when run in a time zone for which daylight savings time is in effect for the starting date.
1525 lines
38 KiB
Plaintext
1525 lines
38 KiB
Plaintext
%{
|
||
/* Parse a string into an internal time stamp.
|
||
|
||
Copyright (C) 1999, 2000, 2002, 2003, 2004, 2005 Free Software
|
||
Foundation, Inc.
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||
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||
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. */
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||
|
||
#ifdef HAVE_CONFIG_H
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||
# include <config.h>
|
||
#endif
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||
|
||
#include "getdate.h"
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||
|
||
/* 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
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||
#define YYINITDEPTH YYMAXDEPTH
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||
|
||
/* 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
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||
think this code needs to do. */
|
||
#ifdef emacs
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||
# undef static
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||
#endif
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||
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||
#include <ctype.h>
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||
#include <limits.h>
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||
#include <stdio.h>
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||
#include <stdlib.h>
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||
#include <string.h>
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||
|
||
#include "setenv.h"
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||
#include "xalloc.h"
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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)
|
||
#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))
|
||
|
||
/* ISDIGIT differs from isdigit, 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 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)
|
||
|
||
#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__
|
||
# define __attribute__(x)
|
||
#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;
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||
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 })
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||
#else
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static relative_time const RELATIVE_TIME_0;
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||
#endif
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||
|
||
/* Information passed to and from the parser. */
|
||
typedef struct
|
||
{
|
||
/* The input string remaining to be parsed. */
|
||
const char *input;
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||
|
||
/* N, if this is the Nth Tuesday. */
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long 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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long 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, seconds, and nanoseconds. */
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textint year;
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long int month;
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long int day;
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long int hour;
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long int minutes;
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struct timespec seconds; /* includes nanoseconds */
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|
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/* Relative year, month, day, hour, minutes, seconds, and nanoseconds. */
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relative_time rel;
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|
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/* Presence or counts of nonterminals of various flavors parsed so far. */
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bool timespec_seen;
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bool rels_seen;
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size_t dates_seen;
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size_t days_seen;
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size_t local_zones_seen;
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size_t dsts_seen;
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size_t times_seen;
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size_t zones_seen;
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|
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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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union YYSTYPE;
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static int yylex (union YYSTYPE *, parser_control *);
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static int yyerror (parser_control *, char *);
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static long int time_zone_hhmm (textint, long int);
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%}
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/* We want a reentrant parser, even if the TZ manipulation and the calls to
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localtime and gmtime are not reentrant. */
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%pure-parser
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%parse-param { parser_control *pc }
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%lex-param { parser_control *pc }
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|
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/* This grammar has 20 shift/reduce conflicts. */
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%expect 20
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%union
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{
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long int intval;
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textint textintval;
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struct timespec timespec;
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relative_time rel;
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}
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%token tAGO tDST
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%token tYEAR_UNIT tMONTH_UNIT tHOUR_UNIT tMINUTE_UNIT tSEC_UNIT
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%token <intval> tDAY_UNIT
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%token <intval> tDAY tDAYZONE tLOCAL_ZONE tMERIDIAN
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%token <intval> tMONTH tORDINAL tZONE
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%token <textintval> tSNUMBER tUNUMBER
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%token <timespec> tSDECIMAL_NUMBER tUDECIMAL_NUMBER
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|
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%type <intval> o_colon_minutes o_merid
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%type <timespec> seconds signed_seconds unsigned_seconds
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|
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%type <rel> relunit relunit_snumber
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|
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%%
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spec:
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timespec
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| items
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;
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timespec:
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'@' seconds
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{
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pc->seconds = $2;
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pc->timespec_seen = true;
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}
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;
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||
|
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items:
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/* empty */
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||
| items item
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||
;
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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
|
||
{ pc->local_zones_seen++; }
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| zone
|
||
{ pc->zones_seen++; }
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| date
|
||
{ 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 = true; }
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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.tv_sec = 0;
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||
pc->seconds.tv_nsec = 0;
|
||
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.tv_sec = 0;
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||
pc->seconds.tv_nsec = 0;
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pc->meridian = $4;
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}
|
||
| tUNUMBER ':' tUNUMBER tSNUMBER o_colon_minutes
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||
{
|
||
pc->hour = $1.value;
|
||
pc->minutes = $3.value;
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||
pc->seconds.tv_sec = 0;
|
||
pc->seconds.tv_nsec = 0;
|
||
pc->meridian = MER24;
|
||
pc->zones_seen++;
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pc->time_zone = time_zone_hhmm ($4, $5);
|
||
}
|
||
| tUNUMBER ':' tUNUMBER ':' unsigned_seconds o_merid
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||
{
|
||
pc->hour = $1.value;
|
||
pc->minutes = $3.value;
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pc->seconds = $5;
|
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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++;
|
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pc->time_zone = time_zone_hhmm ($6, $7);
|
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}
|
||
;
|
||
|
||
local_zone:
|
||
tLOCAL_ZONE
|
||
{
|
||
pc->local_isdst = $1;
|
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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;
|
||
if (ISLOWER (ch))
|
||
*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 *pc ATTRIBUTE_UNUSED, char *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;
|
||
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 */
|