mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-30 12:04:07 +00:00
947 lines
23 KiB
Plaintext
947 lines
23 KiB
Plaintext
%{
|
||
/*
|
||
** 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;
|
||
**
|
||
** This grammar has 10 shift/reduce conflicts.
|
||
**
|
||
** This code is in the public domain and has no copyright.
|
||
*/
|
||
/* SUPPRESS 287 on yaccpar_sccsid *//* Unused static variable */
|
||
/* SUPPRESS 288 on yyerrlab *//* Label unused */
|
||
|
||
#include <sys/cdefs.h>
|
||
#include <stdio.h>
|
||
#include <ctype.h>
|
||
|
||
/* The code at the top of get_date which figures out the offset of the
|
||
current time zone checks various CPP symbols to see if special
|
||
tricks are need, but defaults to using the gettimeofday system call.
|
||
Include <sys/time.h> if that will be used. */
|
||
|
||
# include <sys/types.h>
|
||
# include <sys/time.h>
|
||
|
||
#if defined (__STDC__) || defined (USG)
|
||
#include <string.h>
|
||
#endif
|
||
|
||
#if defined (__STDC__)
|
||
#include <stdlib.h>
|
||
#endif
|
||
|
||
/* NOTES on rebuilding getdate.c (particularly for inclusion in CVS
|
||
releases):
|
||
|
||
We don't want to mess with all the portability hassles of alloca.
|
||
In particular, most (all?) versions of bison will use alloca in
|
||
their parser. If bison works on your system (e.g. it should work
|
||
with gcc), then go ahead and use it, but the more general solution
|
||
is to use byacc instead of bison, which should generate a portable
|
||
parser. I played with adding "#define alloca dont_use_alloca", to
|
||
give an error if the parser generator uses alloca (and thus detect
|
||
unportable getdate.c's), but that seems to cause as many problems
|
||
as it solves. */
|
||
|
||
#include <time.h>
|
||
|
||
#define yylex getdate_yylex
|
||
#define yyerror getdate_yyerror
|
||
|
||
static int yylex(void);
|
||
static int yyerror(const char *);
|
||
|
||
time_t get_date(char *);
|
||
|
||
#define EPOCH 1970
|
||
#define HOUR(x) ((time_t)(x) * 60)
|
||
#define SECSPERDAY (24L * 60L * 60L)
|
||
|
||
|
||
/*
|
||
** An entry in the lexical lookup table.
|
||
*/
|
||
typedef struct _TABLE {
|
||
const char *name;
|
||
int type;
|
||
time_t value;
|
||
} TABLE;
|
||
|
||
|
||
/*
|
||
** Daylight-savings mode: on, off, or not yet known.
|
||
*/
|
||
typedef enum _DSTMODE {
|
||
DSTon, DSToff, DSTmaybe
|
||
} DSTMODE;
|
||
|
||
/*
|
||
** 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 char *yyInput;
|
||
static DSTMODE yyDSTmode;
|
||
static time_t yyDayOrdinal;
|
||
static time_t yyDayNumber;
|
||
static int yyHaveDate;
|
||
static int yyHaveDay;
|
||
static int yyHaveRel;
|
||
static int yyHaveTime;
|
||
static int yyHaveZone;
|
||
static time_t yyTimezone;
|
||
static time_t yyDay;
|
||
static time_t yyHour;
|
||
static time_t yyMinutes;
|
||
static time_t yyMonth;
|
||
static time_t yySeconds;
|
||
static time_t yyYear;
|
||
static MERIDIAN yyMeridian;
|
||
static time_t yyRelMonth;
|
||
static time_t yyRelSeconds;
|
||
|
||
%}
|
||
|
||
%union {
|
||
time_t Number;
|
||
enum _MERIDIAN Meridian;
|
||
}
|
||
|
||
%token tAGO tDAY tDAYZONE tID tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT
|
||
%token tSEC_UNIT tSNUMBER tUNUMBER tZONE tDST
|
||
|
||
%type <Number> tDAY tDAYZONE tMINUTE_UNIT tMONTH tMONTH_UNIT
|
||
%type <Number> tSEC_UNIT tSNUMBER tUNUMBER tZONE
|
||
%type <Meridian> tMERIDIAN o_merid
|
||
|
||
%%
|
||
|
||
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;
|
||
yyDSTmode = DSToff;
|
||
yyTimezone = - ($4 % 100 + ($4 / 100) * 60);
|
||
}
|
||
| tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid {
|
||
yyHour = $1;
|
||
yyMinutes = $3;
|
||
yySeconds = $5;
|
||
yyMeridian = $6;
|
||
}
|
||
| tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER {
|
||
yyHour = $1;
|
||
yyMinutes = $3;
|
||
yySeconds = $5;
|
||
yyMeridian = MER24;
|
||
yyDSTmode = DSToff;
|
||
yyTimezone = - ($6 % 100 + ($6 / 100) * 60);
|
||
}
|
||
;
|
||
|
||
zone : tZONE {
|
||
yyTimezone = $1;
|
||
yyDSTmode = DSToff;
|
||
}
|
||
| tDAYZONE {
|
||
yyTimezone = $1;
|
||
yyDSTmode = DSTon;
|
||
}
|
||
|
|
||
tZONE tDST {
|
||
yyTimezone = $1;
|
||
yyDSTmode = DSTon;
|
||
}
|
||
;
|
||
|
||
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 {
|
||
if ($1 >= 100) {
|
||
yyYear = $1;
|
||
yyMonth = $3;
|
||
yyDay = $5;
|
||
} else {
|
||
yyMonth = $1;
|
||
yyDay = $3;
|
||
yyYear = $5;
|
||
}
|
||
}
|
||
| tUNUMBER tSNUMBER tSNUMBER {
|
||
/* ISO 8601 format. yyyy-mm-dd. */
|
||
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;
|
||
yyRelMonth = -yyRelMonth;
|
||
}
|
||
| relunit
|
||
;
|
||
|
||
relunit : tUNUMBER tMINUTE_UNIT {
|
||
yyRelSeconds += $1 * $2 * 60L;
|
||
}
|
||
| tSNUMBER tMINUTE_UNIT {
|
||
yyRelSeconds += $1 * $2 * 60L;
|
||
}
|
||
| tMINUTE_UNIT {
|
||
yyRelSeconds += $1 * 60L;
|
||
}
|
||
| tSNUMBER tSEC_UNIT {
|
||
yyRelSeconds += $1;
|
||
}
|
||
| tUNUMBER tSEC_UNIT {
|
||
yyRelSeconds += $1;
|
||
}
|
||
| tSEC_UNIT {
|
||
yyRelSeconds++;
|
||
}
|
||
| tSNUMBER tMONTH_UNIT {
|
||
yyRelMonth += $1 * $2;
|
||
}
|
||
| tUNUMBER tMONTH_UNIT {
|
||
yyRelMonth += $1 * $2;
|
||
}
|
||
| tMONTH_UNIT {
|
||
yyRelMonth += $1;
|
||
}
|
||
;
|
||
|
||
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", tMONTH_UNIT, 12 },
|
||
{ "month", tMONTH_UNIT, 1 },
|
||
{ "fortnight", tMINUTE_UNIT, 14 * 24 * 60 },
|
||
{ "week", tMINUTE_UNIT, 7 * 24 * 60 },
|
||
{ "day", tMINUTE_UNIT, 1 * 24 * 60 },
|
||
{ "hour", tMINUTE_UNIT, 60 },
|
||
{ "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. */
|
||
/* Some of these are commented out because a time_t can't store a float. */
|
||
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 */
|
||
{ "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 Stanard, 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 *s __unused)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
|
||
static time_t
|
||
ToSeconds(time_t Hours, time_t Minutes, time_t Seconds, MERIDIAN Meridian)
|
||
{
|
||
if (Minutes < 0 || Minutes > 59 || Seconds < 0 || Seconds > 59)
|
||
return -1;
|
||
switch (Meridian) {
|
||
case MER24:
|
||
if (Hours < 0 || Hours > 23)
|
||
return -1;
|
||
return (Hours * 60L + Minutes) * 60L + Seconds;
|
||
case MERam:
|
||
if (Hours < 1 || Hours > 12)
|
||
return -1;
|
||
if (Hours == 12)
|
||
Hours = 0;
|
||
return (Hours * 60L + Minutes) * 60L + Seconds;
|
||
case MERpm:
|
||
if (Hours < 1 || Hours > 12)
|
||
return -1;
|
||
if (Hours == 12)
|
||
Hours = 0;
|
||
return ((Hours + 12) * 60L + Minutes) * 60L + Seconds;
|
||
default:
|
||
abort ();
|
||
}
|
||
/* NOTREACHED */
|
||
}
|
||
|
||
|
||
/* Year is either
|
||
* A negative number, which means to use its absolute value (why?)
|
||
* A number from 0 to 99, which means a year from 1900 to 1999, or
|
||
* The actual year (>=100). */
|
||
static time_t
|
||
Convert(time_t Month, time_t Day, time_t Year,
|
||
time_t Hours, time_t Minutes, time_t Seconds,
|
||
MERIDIAN Meridian, DSTMODE DSTmode)
|
||
{
|
||
static int DaysInMonth[12] = {
|
||
31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
|
||
};
|
||
time_t tod;
|
||
time_t Julian;
|
||
int i;
|
||
|
||
if (Year < 0)
|
||
Year = -Year;
|
||
if (Year < 69)
|
||
Year += 2000;
|
||
else if (Year < 100)
|
||
Year += 1900;
|
||
DaysInMonth[1] = Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0)
|
||
? 29 : 28;
|
||
/* Checking for 2038 bogusly assumes that time_t is 32 bits. But
|
||
I'm too lazy to try to check for time_t overflow in another way. */
|
||
if (Year < EPOCH || Year > 2038
|
||
|| Month < 1 || Month > 12
|
||
/* Lint fluff: "conversion from long may lose accuracy" */
|
||
|| Day < 1 || Day > DaysInMonth[(int)--Month])
|
||
return -1;
|
||
|
||
for (Julian = Day - 1, i = 0; i < Month; i++)
|
||
Julian += DaysInMonth[i];
|
||
for (i = EPOCH; i < Year; i++)
|
||
Julian += 365 + (i % 4 == 0);
|
||
Julian *= SECSPERDAY;
|
||
Julian += yyTimezone * 60L;
|
||
if ((tod = ToSeconds(Hours, Minutes, Seconds, Meridian)) < 0)
|
||
return -1;
|
||
Julian += tod;
|
||
if (DSTmode == DSTon
|
||
|| (DSTmode == DSTmaybe && localtime(&Julian)->tm_isdst))
|
||
Julian -= 60 * 60;
|
||
return Julian;
|
||
}
|
||
|
||
|
||
static time_t
|
||
DSTcorrect(time_t Start, time_t Future)
|
||
{
|
||
time_t StartDay;
|
||
time_t FutureDay;
|
||
|
||
StartDay = (localtime(&Start)->tm_hour + 1) % 24;
|
||
FutureDay = (localtime(&Future)->tm_hour + 1) % 24;
|
||
return (Future - Start) + (StartDay - FutureDay) * 60L * 60L;
|
||
}
|
||
|
||
|
||
static time_t
|
||
RelativeDate(time_t Start, time_t DayOrdinal, time_t DayNumber)
|
||
{
|
||
struct tm *tm;
|
||
time_t now;
|
||
|
||
now = Start;
|
||
tm = localtime(&now);
|
||
now += SECSPERDAY * ((DayNumber - tm->tm_wday + 7) % 7);
|
||
now += 7 * SECSPERDAY * (DayOrdinal <= 0 ? DayOrdinal : DayOrdinal - 1);
|
||
return DSTcorrect(Start, now);
|
||
}
|
||
|
||
|
||
static time_t
|
||
RelativeMonth(time_t Start, time_t RelMonth)
|
||
{
|
||
struct tm *tm;
|
||
time_t Month;
|
||
time_t Year;
|
||
|
||
if (RelMonth == 0)
|
||
return 0;
|
||
tm = localtime(&Start);
|
||
Month = 12 * (tm->tm_year + 1900) + tm->tm_mon + RelMonth;
|
||
Year = Month / 12;
|
||
Month = Month % 12 + 1;
|
||
return DSTcorrect(Start,
|
||
Convert(Month, (time_t)tm->tm_mday, Year,
|
||
(time_t)tm->tm_hour, (time_t)tm->tm_min, (time_t)tm->tm_sec,
|
||
MER24, DSTmaybe));
|
||
}
|
||
|
||
|
||
static int
|
||
LookupWord(char *buff)
|
||
{
|
||
char *p;
|
||
char *q;
|
||
const TABLE *tp;
|
||
int i;
|
||
int abbrev;
|
||
|
||
/* Make it lowercase. */
|
||
for (p = buff; *p; p++)
|
||
if (isupper(*p))
|
||
*p = tolower(*p);
|
||
|
||
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(*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 = 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)
|
||
{
|
||
char c;
|
||
char *p;
|
||
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 (sign < 0)
|
||
yylval.Number = -yylval.Number;
|
||
return sign ? tSNUMBER : tUNUMBER;
|
||
}
|
||
if (isalpha(c)) {
|
||
for (p = buff; isalpha(c = *yyInput++) || c == '.'; )
|
||
if (p < &buff[sizeof buff - 1])
|
||
*p++ = c;
|
||
*p = '\0';
|
||
yyInput--;
|
||
return LookupWord(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);
|
||
int 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));
|
||
}
|
||
|
||
time_t
|
||
get_date(char *p)
|
||
{
|
||
struct tm *tm, *gmt_ptr, gmt;
|
||
int tzoff;
|
||
time_t Start;
|
||
time_t tod;
|
||
time_t nowtime;
|
||
|
||
bzero (&gmt, sizeof(struct tm));
|
||
yyInput = p;
|
||
|
||
(void)time (&nowtime);
|
||
|
||
gmt_ptr = gmtime (&nowtime);
|
||
if (gmt_ptr != NULL)
|
||
{
|
||
/* Make a copy, in case localtime modifies *tm (I think
|
||
that comment now applies to *gmt_ptr, but I am too
|
||
lazy to dig into how gmtime and locatime allocate the
|
||
structures they return pointers to). */
|
||
gmt = *gmt_ptr;
|
||
}
|
||
|
||
if (! (tm = localtime (&nowtime)))
|
||
return -1;
|
||
|
||
if (gmt_ptr != NULL)
|
||
tzoff = difftm (&gmt, tm) / 60;
|
||
else
|
||
/* We are on a system like VMS, where the system clock is
|
||
in local time and the system has no concept of timezones.
|
||
Hopefully we can fake this out (for the case in which the
|
||
user specifies no timezone) by just saying the timezone
|
||
is zero. */
|
||
tzoff = 0;
|
||
|
||
if(tm->tm_isdst)
|
||
tzoff += 60;
|
||
|
||
tm = localtime(&nowtime);
|
||
yyYear = tm->tm_year + 1900;
|
||
yyMonth = tm->tm_mon + 1;
|
||
yyDay = tm->tm_mday;
|
||
yyTimezone = tzoff;
|
||
yyDSTmode = DSTmaybe;
|
||
yyHour = 0;
|
||
yyMinutes = 0;
|
||
yySeconds = 0;
|
||
yyMeridian = MER24;
|
||
yyRelSeconds = 0;
|
||
yyRelMonth = 0;
|
||
yyHaveDate = 0;
|
||
yyHaveDay = 0;
|
||
yyHaveRel = 0;
|
||
yyHaveTime = 0;
|
||
yyHaveZone = 0;
|
||
|
||
if (yyparse()
|
||
|| yyHaveTime > 1 || yyHaveZone > 1 || yyHaveDate > 1 || yyHaveDay > 1)
|
||
return -1;
|
||
|
||
if (yyHaveDate || yyHaveTime || yyHaveDay) {
|
||
Start = Convert(yyMonth, yyDay, yyYear, yyHour, yyMinutes, yySeconds,
|
||
yyMeridian, yyDSTmode);
|
||
if (Start < 0)
|
||
return -1;
|
||
}
|
||
else {
|
||
Start = nowtime;
|
||
if (!yyHaveRel)
|
||
Start -= ((tm->tm_hour * 60L + tm->tm_min) * 60L) + tm->tm_sec;
|
||
}
|
||
|
||
Start += yyRelSeconds;
|
||
Start += RelativeMonth(Start, yyRelMonth);
|
||
|
||
if (yyHaveDay && !yyHaveDate) {
|
||
tod = RelativeDate(Start, yyDayOrdinal, yyDayNumber);
|
||
Start += tod;
|
||
}
|
||
|
||
/* Have to do *something* with a legitimate -1 so it's distinguishable
|
||
* from the error return value. (Alternately could set errno on error.) */
|
||
return Start == -1 ? 0 : Start;
|
||
}
|
||
|
||
|
||
#if defined(TEST)
|
||
|
||
/* ARGSUSED */
|
||
int
|
||
main(int ac, char *av[])
|
||
{
|
||
char buff[128];
|
||
time_t d;
|
||
|
||
(void)printf("Enter date, or blank line to exit.\n\t> ");
|
||
(void)fflush(stdout);
|
||
while (gets(buff) && buff[0]) {
|
||
d = get_date(buff);
|
||
if (d == -1)
|
||
(void)printf("Bad format - couldn't convert.\n");
|
||
else
|
||
(void)printf("%s", ctime(&d));
|
||
(void)printf("\t> ");
|
||
(void)fflush(stdout);
|
||
}
|
||
exit(0);
|
||
/* NOTREACHED */
|
||
}
|
||
#endif /* defined(TEST) */
|