Show getdate.y syntax highlighted
%{
/*
* $Id: getdate.y 12242 2006-11-06 20:41:55Z cbiere $
*
* Date parsing.
*
*----------------------------------------------------------------------
* This file is part of gtk-gnutella.
*
* gtk-gnutella 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 of the License, or
* (at your option) any later version.
*
* gtk-gnutella 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 gtk-gnutella; if not, write to the Free Software
* Foundation, Inc.:
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*----------------------------------------------------------------------
*/
/*
** Originally written by Steven M. Bellovin <smb@research.att.com> while
** at the University of North Carolina at Chapel Hill. Later tweaked by
** a couple of people on Usenet. Completely overhauled by Rich $alz
** <rsalz@bbn.com> and Jim Berets <jberets@bbn.com> in August, 1990;
**
** Modified by Raphael Manfredi <Rapahel_Manfredi@pobox.com> to add
** support for Gnutella's ISO date format (see NOTE-datetime.txt in
** the gtk-gnutella's doc/other directory) in May, 2002.
**
** This grammar has 14 shift/reduce conflicts.
**
** This code is in the public domain and has no copyright.
*/
#include "common.h"
#ifdef FORCE_ALLOCA_H
#include <alloca.h>
#endif
/* Since the code of getdate.y is not included in the Emacs executable
* itself, there is no need to #define static in this file. Even if
* the code were included in the Emacs executable, it probably
* wouldn't do any harm to #undef it here; this will only cause
* problems if we try to write to a static variable, which I don't
* think this code needs to do.
*/
#ifdef emacs
# undef static
#endif
#if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAS_ISASCII))
# define IN_CTYPE_DOMAIN(c) 1
#else
# define IN_CTYPE_DOMAIN(c) isascii(c)
#endif
#define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (c))
#define ISALPHA(c) (IN_CTYPE_DOMAIN (c) && isalpha (c))
#define ISUPPER(c) (IN_CTYPE_DOMAIN (c) && isupper (c))
#define ISDIGIT_LOCALE(c) (IN_CTYPE_DOMAIN (c) && isdigit (c))
/* ISDIGIT differs from ISDIGIT_LOCALE, as follows:
- Its arg may be any int or unsigned int; it need not be an unsigned char.
- It's guaranteed to evaluate its argument exactly once.
- It's typically faster.
Posix 1003.2-1992 section 2.5.2.1 page 50 lines 1556-1558 says that
only '0' through '9' are digits. Prefer ISDIGIT to ISDIGIT_LOCALE unless
it's important to use the locale's definition of `digit' even when the
host does not conform to Posix. */
#define ISDIGIT(c) ((unsigned) (c) - '0' <= 9)
#include "getdate.h"
/* Some old versions of bison generate parsers that use bcopy.
That loses on systems that don't provide the function, so we have
to redefine it here. */
#if !defined (HAS_BCOPY) && defined (HAS_MEMCPY) && !defined (bcopy)
# define bcopy(from, to, len) memcpy ((to), (from), (len))
#endif
/*
* Remap normal yacc parser interface names (yyparse, yylex, yyerror, etc),
* as well as gratuitiously global symbol names, so we can have multiple
* yacc generated parsers in the same program. Note that these are only
* the variables produced by yacc. If other parser generators (bison,
* byacc, etc) produce additional global names that conflict at link time,
* then those parser generators need to be fixed instead of adding those
* names to this list.
*/
#define yymaxdepth gd_maxdepth
#define yyparse gd_parse
#define yylex gd_lex
#define yyerror gd_error
#define yylval gd_lval
#define yychar gd_char
#define yydebug gd_debug
#define yypact gd_pact
#define yyr1 gd_r1
#define yyr2 gd_r2
#define yydef gd_def
#define yychk gd_chk
#define yypgo gd_pgo
#define yyact gd_act
#define yyexca gd_exca
#define yyerrflag gd_errflag
#define yynerrs gd_nerrs
#define yyps gd_ps
#define yypv gd_pv
#define yys gd_s
#define yy_yys gd_yys
#define yystate gd_state
#define yytmp gd_tmp
#define yyv gd_v
#define yy_yyv gd_yyv
#define yyval gd_val
#define yylloc gd_lloc
#define yyreds gd_reds /* With YYDEBUG defined */
#define yytoks gd_toks /* With YYDEBUG defined */
#define yylhs gd_yylhs
#define yylen gd_yylen
#define yydefred gd_yydefred
#define yydgoto gd_yydgoto
#define yysindex gd_yysindex
#define yyrindex gd_yyrindex
#define yygindex gd_yygindex
#define yytable gd_yytable
#define yycheck gd_yycheck
static int yylex (void);
static int yyerror (const char *s);
extern int yyparse (void);
#define EPOCH 1970
#define HOUR(x) ((x) * 60)
#define MAX_BUFF_LEN 128 /* size of buffer to read the date into */
/*
** An entry in the lexical lookup table.
*/
typedef struct _TABLE {
const char *name;
int type;
int value;
} TABLE;
/*
** Meridian: am, pm, or 24-hour style.
*/
typedef enum _MERIDIAN {
MERam, MERpm, MER24
} MERIDIAN;
/*
** Global variables. We could get rid of most of these by using a good
** union as the yacc stack. (This routine was originally written before
** yacc had the %union construct.) Maybe someday; right now we only use
** the %union very rarely.
*/
static const unsigned char *yyInput;
static int yyDayOrdinal;
static int yyDayNumber;
static int yyHaveDate;
static int yyHaveDay;
static int yyHaveRel;
static int yyHaveTime;
static int yyHaveZone;
static int yyTimezone;
static int yyDay;
static int yyHour;
static int yyMinutes;
static int yyMonth;
static int yySeconds;
static int yyYear;
static MERIDIAN yyMeridian;
static int yyRelDay;
static int yyRelHour;
static int yyRelMinutes;
static int yyRelMonth;
static int yyRelSeconds;
static int yyRelYear;
%}
%union {
int Number;
enum _MERIDIAN Meridian;
}
%token tAGO tDAY tDAY_UNIT tDAYZONE tDST tHOUR_UNIT tID
%token tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT
%token tSEC_UNIT tSNUMBER tUNUMBER tYEAR_UNIT tZONE
%token tNUMBER_T tNUMBER_DOT
%type <Number> tDAY tDAY_UNIT tDAYZONE tHOUR_UNIT tMINUTE_UNIT
%type <Number> tMONTH tMONTH_UNIT
%type <Number> tSEC_UNIT tSNUMBER tUNUMBER tYEAR_UNIT tZONE
%type <Meridian> tMERIDIAN o_merid
%type <Number> tNUMBER_T tNUMBER_DOT
%%
spec : /* NULL */
| spec item
;
item : time {
yyHaveTime++;
}
| zone {
yyHaveZone++;
}
| date {
yyHaveDate++;
}
| day {
yyHaveDay++;
}
| rel {
yyHaveRel++;
}
| number
;
time : tUNUMBER tMERIDIAN {
yyHour = $1;
yyMinutes = 0;
yySeconds = 0;
yyMeridian = $2;
}
| tUNUMBER ':' tUNUMBER o_merid {
yyHour = $1;
yyMinutes = $3;
yySeconds = 0;
yyMeridian = $4;
}
| tUNUMBER ':' tUNUMBER tSNUMBER {
yyHour = $1;
yyMinutes = $3;
yyMeridian = MER24;
yyHaveZone++;
yyTimezone = ($4 < 0
? -$4 % 100 + (-$4 / 100) * 60
: - ($4 % 100 + ($4 / 100) * 60));
}
| tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid {
yyHour = $1;
yyMinutes = $3;
yySeconds = $5;
yyMeridian = $6;
}
| tUNUMBER ':' tUNUMBER ':' tUNUMBER isozone {
yyHour = $1;
yyMinutes = $3;
yySeconds = $5;
yyHaveZone++;
}
| tUNUMBER ':' tUNUMBER ':' tNUMBER_DOT tUNUMBER {
yyHour = $1;
yyMinutes = $3;
yySeconds = $5;
/* We ignore the fractional seconds -- RAM */
}
| tUNUMBER ':' tUNUMBER ':' tNUMBER_DOT tUNUMBER isozone {
yyHour = $1;
yyMinutes = $3;
yySeconds = $5;
/* We ignore the fractional seconds -- RAM */
yyHaveZone++;
}
| tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER {
yyHour = $1;
yyMinutes = $3;
yySeconds = $5;
yyMeridian = MER24;
yyHaveZone++;
yyTimezone = ($6 < 0
? -$6 % 100 + (-$6 / 100) * 60
: - ($6 % 100 + ($6 / 100) * 60));
}
;
zone : tZONE {
yyTimezone = $1;
}
| tDAYZONE {
yyTimezone = $1 - 60;
}
|
tZONE tDST {
yyTimezone = $1 - 60;
}
;
isozone : tSNUMBER ':' tUNUMBER {
/* ISO 8601 format. +02:00 -- RAM */
yyTimezone = $1 < 0
? -$1 * 60 + $3
: -($1 * 60 + $3);
}
;
day : tDAY {
yyDayOrdinal = 1;
yyDayNumber = $1;
}
| tDAY ',' {
yyDayOrdinal = 1;
yyDayNumber = $1;
}
| tUNUMBER tDAY {
yyDayOrdinal = $1;
yyDayNumber = $2;
}
;
date : tUNUMBER '/' tUNUMBER {
yyMonth = $1;
yyDay = $3;
}
| tUNUMBER '/' tUNUMBER '/' tUNUMBER {
/* Interpret as YYYY/MM/DD if $1 >= 1000, otherwise as DD/MM/YYYY.
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 ($1 >= 1000)
{
yyYear = $1;
yyMonth = $3;
yyDay = $5;
}
else
{
yyDay = $1;
yyMonth = $3;
yyYear = $5;
}
}
| tUNUMBER tSNUMBER tSNUMBER {
/* ISO 8601 format. yyyy-mm-dd. */
yyYear = $1;
yyMonth = -$2;
yyDay = -$3;
}
| tUNUMBER tSNUMBER tNUMBER_T {
/* ISO 8601 format. yyyy-mm-ddT -- RAM */
yyYear = $1;
yyMonth = -$2;
yyDay = $3;
}
| tUNUMBER tMONTH tSNUMBER {
/* e.g. 17-JUN-1992. */
yyDay = $1;
yyMonth = $2;
yyYear = -$3;
}
| tMONTH tUNUMBER {
yyMonth = $1;
yyDay = $2;
}
| tMONTH tUNUMBER ',' tUNUMBER {
yyMonth = $1;
yyDay = $2;
yyYear = $4;
}
| tUNUMBER tMONTH {
yyMonth = $2;
yyDay = $1;
}
| tUNUMBER tMONTH tUNUMBER {
yyMonth = $2;
yyDay = $1;
yyYear = $3;
}
;
rel : relunit tAGO {
yyRelSeconds = -yyRelSeconds;
yyRelMinutes = -yyRelMinutes;
yyRelHour = -yyRelHour;
yyRelDay = -yyRelDay;
yyRelMonth = -yyRelMonth;
yyRelYear = -yyRelYear;
}
| relunit
;
relunit : tUNUMBER tYEAR_UNIT {
yyRelYear += $1 * $2;
}
| tSNUMBER tYEAR_UNIT {
yyRelYear += $1 * $2;
}
| tYEAR_UNIT {
yyRelYear++;
}
| tUNUMBER tMONTH_UNIT {
yyRelMonth += $1 * $2;
}
| tSNUMBER tMONTH_UNIT {
yyRelMonth += $1 * $2;
}
| tMONTH_UNIT {
yyRelMonth++;
}
| tUNUMBER tDAY_UNIT {
yyRelDay += $1 * $2;
}
| tSNUMBER tDAY_UNIT {
yyRelDay += $1 * $2;
}
| tDAY_UNIT {
yyRelDay++;
}
| tUNUMBER tHOUR_UNIT {
yyRelHour += $1 * $2;
}
| tSNUMBER tHOUR_UNIT {
yyRelHour += $1 * $2;
}
| tHOUR_UNIT {
yyRelHour++;
}
| tUNUMBER tMINUTE_UNIT {
yyRelMinutes += $1 * $2;
}
| tSNUMBER tMINUTE_UNIT {
yyRelMinutes += $1 * $2;
}
| tMINUTE_UNIT {
yyRelMinutes++;
}
| tUNUMBER tSEC_UNIT {
yyRelSeconds += $1 * $2;
}
| tSNUMBER tSEC_UNIT {
yyRelSeconds += $1 * $2;
}
| tSEC_UNIT {
yyRelSeconds++;
}
;
number : tUNUMBER
{
if (yyHaveTime && yyHaveDate && !yyHaveRel)
yyYear = $1;
else
{
if ($1>10000)
{
yyHaveDate++;
yyDay= ($1)%100;
yyMonth= ($1/100)%100;
yyYear = $1/10000;
}
else
{
yyHaveTime++;
if ($1 < 100)
{
yyHour = $1;
yyMinutes = 0;
}
else
{
yyHour = $1 / 100;
yyMinutes = $1 % 100;
}
yySeconds = 0;
yyMeridian = MER24;
}
}
}
;
o_merid : /* NULL */
{
$$ = MER24;
}
| tMERIDIAN
{
$$ = $1;
}
;
%%
/* Month and day table. */
static TABLE const MonthDayTable[] = {
{ "january", tMONTH, 1 },
{ "february", tMONTH, 2 },
{ "march", tMONTH, 3 },
{ "april", tMONTH, 4 },
{ "may", tMONTH, 5 },
{ "june", tMONTH, 6 },
{ "july", tMONTH, 7 },
{ "august", tMONTH, 8 },
{ "september", tMONTH, 9 },
{ "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 }
};
/* Time units table. */
static TABLE const UnitsTable[] = {
{ "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 OtherTable[] = {
{ "tomorrow", tMINUTE_UNIT, 1 * 24 * 60 },
{ "yesterday", tMINUTE_UNIT, -1 * 24 * 60 },
{ "today", tMINUTE_UNIT, 0 },
{ "now", tMINUTE_UNIT, 0 },
{ "last", tUNUMBER, -1 },
{ "this", tMINUTE_UNIT, 0 },
{ "next", tUNUMBER, 2 },
{ "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 },
{ NULL, 0, 0 }
};
/* The timezone table. */
static TABLE const TimezoneTable[] = {
{ "gmt", tZONE, HOUR ( 0) }, /* Greenwich Mean */
{ "ut", tZONE, HOUR ( 0) }, /* Universal (Coordinated) */
{ "utc", tZONE, HOUR ( 0) },
{ "wet", tZONE, HOUR ( 0) }, /* Western European */
{ "bst", tDAYZONE, HOUR ( 0) }, /* British Summer */
{ "wat", tZONE, HOUR ( 1) }, /* West Africa */
{ "at", tZONE, HOUR ( 2) }, /* Azores */
#if 0
/* For completeness. BST is also British Summer, and GST is
* also Guam Standard. */
{ "bst", tZONE, HOUR ( 3) }, /* Brazil Standard */
{ "gst", tZONE, HOUR ( 3) }, /* Greenland Standard */
#endif
#if 0
{ "nft", tZONE, HOUR (3.5) }, /* Newfoundland */
{ "nst", tZONE, HOUR (3.5) }, /* Newfoundland Standard */
{ "ndt", tDAYZONE, HOUR (3.5) }, /* Newfoundland Daylight */
#endif
{ "ast", tZONE, HOUR ( 4) }, /* Atlantic Standard */
{ "adt", tDAYZONE, HOUR ( 4) }, /* Atlantic Daylight */
{ "est", tZONE, HOUR ( 5) }, /* Eastern Standard */
{ "edt", tDAYZONE, HOUR ( 5) }, /* Eastern Daylight */
{ "cst", tZONE, HOUR ( 6) }, /* Central Standard */
{ "cdt", tDAYZONE, HOUR ( 6) }, /* Central Daylight */
{ "mst", tZONE, HOUR ( 7) }, /* Mountain Standard */
{ "mdt", tDAYZONE, HOUR ( 7) }, /* Mountain Daylight */
{ "pst", tZONE, HOUR ( 8) }, /* Pacific Standard */
{ "pdt", tDAYZONE, HOUR ( 8) }, /* Pacific Daylight */
{ "yst", tZONE, HOUR ( 9) }, /* Yukon Standard */
{ "ydt", tDAYZONE, HOUR ( 9) }, /* Yukon Daylight */
{ "hst", tZONE, HOUR (10) }, /* Hawaii Standard */
{ "hdt", tDAYZONE, HOUR (10) }, /* Hawaii Daylight */
{ "cat", tZONE, HOUR (10) }, /* Central Alaska */
{ "ahst", tZONE, HOUR (10) }, /* Alaska-Hawaii Standard */
{ "nt", tZONE, HOUR (11) }, /* Nome */
{ "idlw", tZONE, HOUR (12) }, /* International Date Line West */
{ "cet", tZONE, -HOUR (1) }, /* Central European */
{ "met", tZONE, -HOUR (1) }, /* Middle European */
{ "mewt", tZONE, -HOUR (1) }, /* Middle European Winter */
{ "mest", tDAYZONE, -HOUR (1) }, /* Middle European Summer */
{ "mesz", tDAYZONE, -HOUR (1) }, /* Middle European Summer */
{ "swt", tZONE, -HOUR (1) }, /* Swedish Winter */
{ "sst", tDAYZONE, -HOUR (1) }, /* Swedish Summer */
{ "fwt", tZONE, -HOUR (1) }, /* French Winter */
{ "fst", tDAYZONE, -HOUR (1) }, /* French Summer */
{ "eet", tZONE, -HOUR (2) }, /* Eastern Europe, USSR Zone 1 */
{ "bt", tZONE, -HOUR (3) }, /* Baghdad, USSR Zone 2 */
#if 0
{ "it", tZONE, -HOUR (3.5) },/* Iran */
#endif
{ "zp4", tZONE, -HOUR (4) }, /* USSR Zone 3 */
{ "zp5", tZONE, -HOUR (5) }, /* USSR Zone 4 */
#if 0
{ "ist", tZONE, -HOUR (5.5) },/* Indian Standard */
#endif
{ "zp6", tZONE, -HOUR (6) }, /* USSR Zone 5 */
#if 0
/* For completeness. NST is also Newfoundland Standard, and SST is
* also Swedish Summer. */
{ "nst", tZONE, -HOUR (6.5) },/* North Sumatra */
{ "sst", tZONE, -HOUR (7) }, /* South Sumatra, USSR Zone 6 */
#endif /* 0 */
{ "wast", tZONE, -HOUR (7) }, /* West Australian Standard */
{ "wadt", tDAYZONE, -HOUR (7) }, /* West Australian Daylight */
#if 0
{ "jt", tZONE, -HOUR (7.5) },/* Java (3pm in Cronusland!) */
#endif
{ "cct", tZONE, -HOUR (8) }, /* China Coast, USSR Zone 7 */
{ "jst", tZONE, -HOUR (9) }, /* Japan Standard, USSR Zone 8 */
#if 0
{ "cast", tZONE, -HOUR (9.5) },/* Central Australian Standard */
{ "cadt", tDAYZONE, -HOUR (9.5) },/* Central Australian Daylight */
#endif
{ "east", tZONE, -HOUR (10) }, /* Eastern Australian Standard */
{ "eadt", tDAYZONE, -HOUR (10) }, /* Eastern Australian Daylight */
{ "gst", tZONE, -HOUR (10) }, /* Guam Standard, USSR Zone 9 */
{ "nzt", tZONE, -HOUR (12) }, /* New Zealand */
{ "nzst", tZONE, -HOUR (12) }, /* New Zealand Standard */
{ "nzdt", tDAYZONE, -HOUR (12) }, /* New Zealand Daylight */
{ "idle", tZONE, -HOUR (12) }, /* International Date Line East */
{ NULL, 0, 0 }
};
/* Military timezone table. */
static TABLE const MilitaryTable[] = {
{ "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 }
};
/* ARGSUSED */
static int yyerror(const char *unused_s)
{
(void) unused_s;
return 0;
}
static int ToHour(int Hours, MERIDIAN Meridian)
{
switch (Meridian) {
case MER24:
if (Hours < 0 || Hours > 23)
return -1;
return Hours;
case MERam:
if (Hours < 1 || Hours > 12)
return -1;
if (Hours == 12)
Hours = 0;
return Hours;
case MERpm:
if (Hours < 1 || Hours > 12)
return -1;
if (Hours == 12)
Hours = 0;
return Hours + 12;
default:
abort();
}
/* NOTREACHED */
}
static int ToYear(int Year)
{
if (Year < 0)
Year = -Year;
/* XPG4 suggests that years 00-68 map to 2000-2068, and
years 69-99 map to 1969-1999. */
if (Year < 69)
Year += 2000;
else if (Year < 100)
Year += 1900;
return Year;
}
static int LookupWord(char *buff)
{
register unsigned char *p;
register unsigned char *q;
register const TABLE *tp;
int i;
int abbrev;
/* Make it lowercase. */
for (p = (unsigned char *) buff; *p; p++)
if (ISUPPER(*p))
*p += 32;
if (strcmp(buff, "am") == 0 || strcmp(buff, "a.m.") == 0) {
yylval.Meridian = MERam;
return tMERIDIAN;
}
if (strcmp(buff, "pm") == 0 || strcmp(buff, "p.m.") == 0) {
yylval.Meridian = MERpm;
return tMERIDIAN;
}
/* See if we have an abbreviation for a month. */
if (strlen(buff) == 3)
abbrev = 1;
else if (strlen(buff) == 4 && buff[3] == '.') {
abbrev = 1;
buff[3] = '\0';
} else
abbrev = 0;
for (tp = MonthDayTable; tp->name; tp++) {
if (abbrev) {
if (strncmp(buff, tp->name, 3) == 0) {
yylval.Number = tp->value;
return tp->type;
}
} else if (strcmp(buff, tp->name) == 0) {
yylval.Number = tp->value;
return tp->type;
}
}
for (tp = TimezoneTable; tp->name; tp++)
if (strcmp(buff, tp->name) == 0) {
yylval.Number = tp->value;
return tp->type;
}
if (strcmp(buff, "dst") == 0)
return tDST;
for (tp = UnitsTable; tp->name; tp++)
if (strcmp(buff, tp->name) == 0) {
yylval.Number = tp->value;
return tp->type;
}
/* Strip off any plural and try the units table again. */
i = strlen(buff) - 1;
if (buff[i] == 's') {
buff[i] = '\0';
for (tp = UnitsTable; tp->name; tp++)
if (strcmp(buff, tp->name) == 0) {
yylval.Number = tp->value;
return tp->type;
}
buff[i] = 's'; /* Put back for "this" in OtherTable. */
}
for (tp = OtherTable; tp->name; tp++)
if (strcmp(buff, tp->name) == 0) {
yylval.Number = tp->value;
return tp->type;
}
/* Military timezones. */
if (buff[1] == '\0' && ISALPHA((unsigned char) *buff)) {
for (tp = MilitaryTable; tp->name; tp++)
if (strcmp(buff, tp->name) == 0) {
yylval.Number = tp->value;
return tp->type;
}
}
/* Drop out any periods and try the timezone table again. */
for (i = 0, p = q = (unsigned char *) buff; *q; q++)
if (*q != '.')
*p++ = *q;
else
i++;
*p = '\0';
if (i)
for (tp = TimezoneTable; tp->name; tp++)
if (strcmp(buff, tp->name) == 0) {
yylval.Number = tp->value;
return tp->type;
}
return tID;
}
static int yylex(void)
{
register unsigned char c;
register unsigned char *p;
unsigned char buff[20];
int Count;
int sign;
for (;;) {
while (ISSPACE(*yyInput))
yyInput++;
if (ISDIGIT(c = *yyInput) || c == '-' || c == '+') {
if (c == '-' || c == '+') {
sign = c == '-' ? -1 : 1;
if (!ISDIGIT(*++yyInput))
/* skip the '-' sign */
continue;
} else
sign = 0;
for (yylval.Number = 0; ISDIGIT(c = *yyInput++);)
yylval.Number = 10 * yylval.Number + c - '0';
yyInput--;
/*
* If we detect digit 'T', then it's a new ISO time.
* Return tNUMBER_T to indicate a number followed by 'T'.
*
* If we detect digit '.', then it's a fractional second
* in the ISO specs, and we return tNUMBER_DOT
*
* --RAM, 20/05/2002
*/
c = *yyInput++;
if (c == 'T')
return tNUMBER_T;
else if (c == '.')
return tNUMBER_DOT;
else
yyInput--;
if (sign < 0)
yylval.Number = -yylval.Number;
return sign ? tSNUMBER : tUNUMBER;
}
if (ISALPHA(c)) {
for (p = buff; (c = *yyInput++, ISALPHA(c)) || c == '.';)
if (p < &buff[sizeof buff - 1])
*p++ = c;
*p = '\0';
yyInput--;
return LookupWord((char *) buff);
}
if (c != '(')
return *yyInput++;
Count = 0;
do {
c = *yyInput++;
if (c == '\0')
return c;
if (c == '(')
Count++;
else if (c == ')')
Count--;
}
while (Count > 0);
}
}
#define TM_YEAR_ORIGIN 1900
/* Yield A - B, measured in seconds. */
static long difftm(struct tm *a, struct tm *b)
{
int ay = a->tm_year + (TM_YEAR_ORIGIN - 1);
int by = b->tm_year + (TM_YEAR_ORIGIN - 1);
long days = (
/* difference in day of year */
a->tm_yday - b->tm_yday
/* + intervening leap days */
+ ((ay >> 2) - (by >> 2))
- (ay / 100 - by / 100)
+ ((ay / 100 >> 2) - (by / 100 >> 2))
/* + difference in years * 365 */
+ (long) (ay - by) * 365);
return (60 * (60 * (24 * days + (a->tm_hour - b->tm_hour))
+ (a->tm_min - b->tm_min))
+ (a->tm_sec - b->tm_sec));
}
/*
* date2time
*
* Convert date string into time_t.
*
* NB: was originally called getdate(), but it conflicted with a library
* routine on Solaris.
*/
time_t date2time(const char *p, time_t now)
{
struct tm tm, tm0, *tmp;
time_t Start;
yyInput = (const unsigned char *) p;
tmp = localtime(&now);
yyYear = tmp->tm_year + TM_YEAR_ORIGIN;
yyMonth = tmp->tm_mon + 1;
yyDay = tmp->tm_mday;
yyHour = tmp->tm_hour;
yyMinutes = tmp->tm_min;
yySeconds = tmp->tm_sec;
yyMeridian = MER24;
yyRelSeconds = 0;
yyRelMinutes = 0;
yyRelHour = 0;
yyRelDay = 0;
yyRelMonth = 0;
yyRelYear = 0;
yyHaveDate = 0;
yyHaveDay = 0;
yyHaveRel = 0;
yyHaveTime = 0;
yyHaveZone = 0;
if (yyparse()
|| yyHaveTime > 1 || yyHaveZone > 1 || yyHaveDate > 1
|| yyHaveDay > 1)
return -1;
tm.tm_year = ToYear(yyYear) - TM_YEAR_ORIGIN + yyRelYear;
tm.tm_mon = yyMonth - 1 + yyRelMonth;
tm.tm_mday = yyDay + yyRelDay;
if (yyHaveTime || (yyHaveRel && !yyHaveDate && !yyHaveDay)) {
tm.tm_hour = ToHour(yyHour, yyMeridian);
if (tm.tm_hour < 0)
return -1;
tm.tm_min = yyMinutes;
tm.tm_sec = yySeconds;
} else {
tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
}
tm.tm_hour += yyRelHour;
tm.tm_min += yyRelMinutes;
tm.tm_sec += yyRelSeconds;
tm.tm_isdst = -1;
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 (yyHaveZone) {
tm = tm0;
if (tm.tm_year <= EPOCH - TM_YEAR_ORIGIN) {
tm.tm_mday++;
yyTimezone -= 24 * 60;
} else {
tm.tm_mday--;
yyTimezone += 24 * 60;
}
Start = mktime(&tm);
}
if (Start == (time_t) - 1)
return Start;
}
if (yyHaveDay && !yyHaveDate) {
tm.tm_mday += ((yyDayNumber - tm.tm_wday + 7) % 7
+ 7 * (yyDayOrdinal - (0 < yyDayOrdinal)));
Start = mktime(&tm);
if (Start == (time_t) - 1)
return Start;
}
if (yyHaveZone) {
long delta = yyTimezone * 60L + difftm(&tm, gmtime(&Start));
if ((Start + delta < Start) != (delta < 0))
return -1; /* time_t overflow */
Start += delta;
}
return Start;
}
#if defined (TEST)
/* ARGSUSED */
int main(int ac, char *av[])
{
char buff[MAX_BUFF_LEN + 1];
time_t d;
(void) printf("Enter date, or blank line to exit.\n\t> ");
(void) fflush(stdout);
buff[MAX_BUFF_LEN] = 0;
while (fgets(buff, MAX_BUFF_LEN, stdin) && buff[0]) {
time_t now;
d = date2time(buff, time(NULL));
if (d == -1)
(void) printf("Bad format - couldn't convert.\n");
else
(void) printf("%d - %s", (int) d, ctime(&d));
(void) printf("\t> ");
(void) fflush(stdout);
}
exit(0);
/* NOTREACHED */
}
#endif /* defined (TEST) */
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