978 lines
23 KiB
Plaintext
978 lines
23 KiB
Plaintext
%{
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/*
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** Originally written by Steven M. Bellovin <smb@research.att.com> while
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** at the University of North Carolina at Chapel Hill. Later tweaked by
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** a couple of people on Usenet. Completely overhauled by Rich $alz
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** <rsalz@bbn.com> and Jim Berets <jberets@bbn.com> in August, 1990;
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**
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** This grammar has 13 shift/reduce conflicts.
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**
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** This code is in the public domain and has no copyright.
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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# ifdef FORCE_ALLOCA_H
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# include <alloca.h>
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# endif
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#endif
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/* Since the code of getdate.y is not included in the Emacs executable
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itself, there is no need to #define static in this file. Even if
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the code were included in the Emacs executable, it probably
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wouldn't do any harm to #undef it here; this will only cause
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problems if we try to write to a static variable, which I don't
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think this code needs to do. */
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#ifdef emacs
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# undef static
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#endif
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#include <stdio.h>
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#include <ctype.h>
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#include <time.h>
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#if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII))
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# define IN_CTYPE_DOMAIN(c) 1
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#else
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# define IN_CTYPE_DOMAIN(c) isascii(c)
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#endif
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#define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (c))
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#define ISALPHA(c) (IN_CTYPE_DOMAIN (c) && isalpha (c))
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#define ISUPPER(c) (IN_CTYPE_DOMAIN (c) && isupper (c))
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#define ISDIGIT_LOCALE(c) (IN_CTYPE_DOMAIN (c) && isdigit (c))
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/* ISDIGIT differs from ISDIGIT_LOCALE, as follows:
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- Its arg may be any int or unsigned int; it need not be an unsigned char.
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- It's guaranteed to evaluate its argument exactly once.
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- It's typically faster.
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Posix 1003.2-1992 section 2.5.2.1 page 50 lines 1556-1558 says that
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only '0' through '9' are digits. Prefer ISDIGIT to ISDIGIT_LOCALE unless
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it's important to use the locale's definition of `digit' even when the
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host does not conform to Posix. */
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#define ISDIGIT(c) ((unsigned) (c) - '0' <= 9)
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#include "getdate.h"
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#if defined (STDC_HEADERS)
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# include <string.h>
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#endif
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/* Some old versions of bison generate parsers that use bcopy.
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That loses on systems that don't provide the function, so we have
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to redefine it here. */
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#if !defined (HAVE_BCOPY) && defined (HAVE_MEMCPY) && !defined (bcopy)
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# define bcopy(from, to, len) memcpy ((to), (from), (len))
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#endif
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/* Remap normal yacc parser interface names (yyparse, yylex, yyerror, etc),
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as well as gratuitously global symbol names, so we can have multiple
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yacc generated parsers in the same program. Note that these are only
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the variables produced by yacc. If other parser generators (bison,
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byacc, etc) produce additional global names that conflict at link time,
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then those parser generators need to be fixed instead of adding those
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names to this list. */
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#define yymaxdepth gd_maxdepth
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#define yyparse gd_parse
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#define yylex gd_lex
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#define yyerror gd_error
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#define yylval gd_lval
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#define yychar gd_char
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#define yydebug gd_debug
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#define yypact gd_pact
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#define yyr1 gd_r1
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#define yyr2 gd_r2
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#define yydef gd_def
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#define yychk gd_chk
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#define yypgo gd_pgo
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#define yyact gd_act
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#define yyexca gd_exca
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#define yyerrflag gd_errflag
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#define yynerrs gd_nerrs
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#define yyps gd_ps
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#define yypv gd_pv
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#define yys gd_s
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#define yy_yys gd_yys
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#define yystate gd_state
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#define yytmp gd_tmp
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#define yyv gd_v
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#define yy_yyv gd_yyv
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#define yyval gd_val
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#define yylloc gd_lloc
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#define yyreds gd_reds /* With YYDEBUG defined */
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#define yytoks gd_toks /* With YYDEBUG defined */
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#define yylhs gd_yylhs
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#define yylen gd_yylen
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#define yydefred gd_yydefred
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#define yydgoto gd_yydgoto
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#define yysindex gd_yysindex
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#define yyrindex gd_yyrindex
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#define yygindex gd_yygindex
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#define yytable gd_yytable
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#define yycheck gd_yycheck
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static int yylex (void);
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static int yyerror (const char *s);
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#define EPOCH 1970
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#define HOUR(x) ((x) * 60)
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#define MAX_BUFF_LEN 128 /* size of buffer to read the date into */
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/*
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** An entry in the lexical lookup table.
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*/
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typedef struct _TABLE {
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const char *name;
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int type;
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int value;
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} TABLE;
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/*
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** Meridian: am, pm, or 24-hour style.
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*/
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typedef enum _MERIDIAN {
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MERam, MERpm, MER24
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} MERIDIAN;
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/*
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** Global variables. We could get rid of most of these by using a good
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** union as the yacc stack. (This routine was originally written before
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** yacc had the %union construct.) Maybe someday; right now we only use
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** the %union very rarely.
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*/
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static const char *yyInput;
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static int yyDayOrdinal;
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static int yyDayNumber;
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static int yyHaveDate;
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static int yyHaveDay;
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static int yyHaveRel;
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static int yyHaveTime;
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static int yyHaveZone;
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static int yyTimezone;
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static int yyDay;
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static int yyHour;
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static int yyMinutes;
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static int yyMonth;
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static int yySeconds;
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static int yyYear;
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static MERIDIAN yyMeridian;
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static int yyRelDay;
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static int yyRelHour;
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static int yyRelMinutes;
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static int yyRelMonth;
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static int yyRelSeconds;
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static int yyRelYear;
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%}
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%union {
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int Number;
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enum _MERIDIAN Meridian;
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}
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%token tAGO tDAY tDAY_UNIT tDAYZONE tDST tHOUR_UNIT tID
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%token tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT
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%token tSEC_UNIT tSNUMBER tUNUMBER tYEAR_UNIT tZONE
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%type <Number> tDAY tDAY_UNIT tDAYZONE tHOUR_UNIT tMINUTE_UNIT
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%type <Number> tMONTH tMONTH_UNIT
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%type <Number> tSEC_UNIT tSNUMBER tUNUMBER tYEAR_UNIT tZONE
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%type <Meridian> tMERIDIAN o_merid
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%%
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spec : /* NULL */
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| spec item
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;
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item : time {
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yyHaveTime++;
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}
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| zone {
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yyHaveZone++;
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}
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| date {
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yyHaveDate++;
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}
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| day {
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yyHaveDay++;
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}
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| rel {
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yyHaveRel++;
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}
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| number
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;
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time : tUNUMBER tMERIDIAN {
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yyHour = $1;
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yyMinutes = 0;
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yySeconds = 0;
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yyMeridian = $2;
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}
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| tUNUMBER ':' tUNUMBER o_merid {
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yyHour = $1;
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yyMinutes = $3;
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yySeconds = 0;
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yyMeridian = $4;
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}
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| tUNUMBER ':' tUNUMBER tSNUMBER {
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yyHour = $1;
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yyMinutes = $3;
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yyMeridian = MER24;
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yyHaveZone++;
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yyTimezone = ($4 < 0
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? -$4 % 100 + (-$4 / 100) * 60
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: - ($4 % 100 + ($4 / 100) * 60));
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}
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| tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid {
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yyHour = $1;
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yyMinutes = $3;
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yySeconds = $5;
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yyMeridian = $6;
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}
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| tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER {
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yyHour = $1;
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yyMinutes = $3;
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yySeconds = $5;
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yyMeridian = MER24;
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yyHaveZone++;
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yyTimezone = ($6 < 0
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? -$6 % 100 + (-$6 / 100) * 60
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: - ($6 % 100 + ($6 / 100) * 60));
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}
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;
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zone : tZONE {
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yyTimezone = $1;
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}
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| tDAYZONE {
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yyTimezone = $1 - 60;
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}
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tZONE tDST {
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yyTimezone = $1 - 60;
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}
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;
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day : tDAY {
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yyDayOrdinal = 1;
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yyDayNumber = $1;
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}
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| tDAY ',' {
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yyDayOrdinal = 1;
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yyDayNumber = $1;
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}
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| tUNUMBER tDAY {
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yyDayOrdinal = $1;
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yyDayNumber = $2;
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}
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;
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date : tUNUMBER '/' tUNUMBER {
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yyMonth = $1;
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yyDay = $3;
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}
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| tUNUMBER '/' tUNUMBER '/' tUNUMBER {
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/* Interpret as YYYY/MM/DD if $1 >= 1000, otherwise as MM/DD/YY.
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The goal in recognizing YYYY/MM/DD is solely to support legacy
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machine-generated dates like those in an RCS log listing. If
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you want portability, use the ISO 8601 format. */
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if ($1 >= 1000)
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{
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yyYear = $1;
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yyMonth = $3;
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yyDay = $5;
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}
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else
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{
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yyMonth = $1;
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yyDay = $3;
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yyYear = $5;
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}
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}
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| tUNUMBER tSNUMBER tSNUMBER {
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/* ISO 8601 format. yyyy-mm-dd. */
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yyYear = $1;
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yyMonth = -$2;
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yyDay = -$3;
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}
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| tUNUMBER tMONTH tSNUMBER {
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/* e.g. 17-JUN-1992. */
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yyDay = $1;
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yyMonth = $2;
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yyYear = -$3;
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}
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| tMONTH tUNUMBER {
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yyMonth = $1;
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yyDay = $2;
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}
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| tMONTH tUNUMBER ',' tUNUMBER {
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yyMonth = $1;
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yyDay = $2;
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yyYear = $4;
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}
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| tUNUMBER tMONTH {
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yyMonth = $2;
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yyDay = $1;
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}
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| tUNUMBER tMONTH tUNUMBER {
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yyMonth = $2;
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yyDay = $1;
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yyYear = $3;
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}
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;
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rel : relunit tAGO {
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yyRelSeconds = -yyRelSeconds;
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yyRelMinutes = -yyRelMinutes;
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yyRelHour = -yyRelHour;
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yyRelDay = -yyRelDay;
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yyRelMonth = -yyRelMonth;
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yyRelYear = -yyRelYear;
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}
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| relunit
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;
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relunit : tUNUMBER tYEAR_UNIT {
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yyRelYear += $1 * $2;
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}
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| tSNUMBER tYEAR_UNIT {
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yyRelYear += $1 * $2;
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}
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| tYEAR_UNIT {
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yyRelYear++;
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}
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| tUNUMBER tMONTH_UNIT {
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yyRelMonth += $1 * $2;
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}
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| tSNUMBER tMONTH_UNIT {
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yyRelMonth += $1 * $2;
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}
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| tMONTH_UNIT {
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yyRelMonth++;
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}
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| tUNUMBER tDAY_UNIT {
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yyRelDay += $1 * $2;
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}
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| tSNUMBER tDAY_UNIT {
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yyRelDay += $1 * $2;
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}
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| tDAY_UNIT {
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yyRelDay++;
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}
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| tUNUMBER tHOUR_UNIT {
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yyRelHour += $1 * $2;
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}
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| tSNUMBER tHOUR_UNIT {
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yyRelHour += $1 * $2;
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}
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| tHOUR_UNIT {
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yyRelHour++;
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}
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| tUNUMBER tMINUTE_UNIT {
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yyRelMinutes += $1 * $2;
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}
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| tSNUMBER tMINUTE_UNIT {
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yyRelMinutes += $1 * $2;
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}
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| tMINUTE_UNIT {
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yyRelMinutes++;
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}
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| tUNUMBER tSEC_UNIT {
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yyRelSeconds += $1 * $2;
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}
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| tSNUMBER tSEC_UNIT {
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yyRelSeconds += $1 * $2;
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}
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| tSEC_UNIT {
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yyRelSeconds++;
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}
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;
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number : tUNUMBER
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{
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if ((yyHaveTime != 0) && (yyHaveDate != 0) && (yyHaveRel == 0))
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yyYear = $1;
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else
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{
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if ($1>10000)
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{
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yyHaveDate++;
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yyDay= ($1)%100;
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yyMonth= ($1/100)%100;
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yyYear = $1/10000;
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}
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else
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{
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yyHaveTime++;
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if ($1 < 100)
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{
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yyHour = $1;
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yyMinutes = 0;
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}
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else
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{
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yyHour = $1 / 100;
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yyMinutes = $1 % 100;
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}
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yySeconds = 0;
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yyMeridian = MER24;
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}
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}
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}
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;
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o_merid : /* NULL */
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{
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$$ = MER24;
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}
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| tMERIDIAN
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{
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$$ = $1;
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}
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;
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%%
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/* Month and day table. */
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static TABLE const MonthDayTable[] = {
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{ "january", tMONTH, 1 },
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{ "february", tMONTH, 2 },
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{ "march", tMONTH, 3 },
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{ "april", tMONTH, 4 },
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{ "may", tMONTH, 5 },
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{ "june", tMONTH, 6 },
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{ "july", tMONTH, 7 },
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{ "august", tMONTH, 8 },
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{ "september", tMONTH, 9 },
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{ "sept", tMONTH, 9 },
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{ "october", tMONTH, 10 },
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{ "november", tMONTH, 11 },
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{ "december", tMONTH, 12 },
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{ "sunday", tDAY, 0 },
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{ "monday", tDAY, 1 },
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{ "tuesday", tDAY, 2 },
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{ "tues", tDAY, 2 },
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{ "wednesday", tDAY, 3 },
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{ "wednes", tDAY, 3 },
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{ "thursday", tDAY, 4 },
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{ "thur", tDAY, 4 },
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{ "thurs", tDAY, 4 },
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{ "friday", tDAY, 5 },
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{ "saturday", tDAY, 6 },
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{ NULL, 0, 0 }
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};
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/* Time units table. */
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static TABLE const UnitsTable[] = {
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{ "year", tYEAR_UNIT, 1 },
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{ "month", tMONTH_UNIT, 1 },
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{ "fortnight", tDAY_UNIT, 14 },
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{ "week", tDAY_UNIT, 7 },
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{ "day", tDAY_UNIT, 1 },
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{ "hour", tHOUR_UNIT, 1 },
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{ "minute", tMINUTE_UNIT, 1 },
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{ "min", tMINUTE_UNIT, 1 },
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{ "second", tSEC_UNIT, 1 },
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{ "sec", tSEC_UNIT, 1 },
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{ NULL, 0, 0 }
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};
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/* Assorted relative-time words. */
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static TABLE const OtherTable[] = {
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{ "tomorrow", tMINUTE_UNIT, 1 * 24 * 60 },
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{ "yesterday", tMINUTE_UNIT, -1 * 24 * 60 },
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{ "today", tMINUTE_UNIT, 0 },
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{ "now", tMINUTE_UNIT, 0 },
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{ "last", tUNUMBER, -1 },
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{ "this", tMINUTE_UNIT, 0 },
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{ "next", tUNUMBER, 2 },
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{ "first", tUNUMBER, 1 },
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/* { "second", tUNUMBER, 2 }, */
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{ "third", tUNUMBER, 3 },
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{ "fourth", tUNUMBER, 4 },
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{ "fifth", tUNUMBER, 5 },
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{ "sixth", tUNUMBER, 6 },
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{ "seventh", tUNUMBER, 7 },
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{ "eighth", tUNUMBER, 8 },
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{ "ninth", tUNUMBER, 9 },
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{ "tenth", tUNUMBER, 10 },
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{ "eleventh", tUNUMBER, 11 },
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{ "twelfth", tUNUMBER, 12 },
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{ "ago", tAGO, 1 },
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{ NULL, 0, 0 }
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};
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/* The timezone table. */
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static TABLE const TimezoneTable[] = {
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{ "gmt", tZONE, HOUR ( 0) }, /* Greenwich Mean */
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{ "ut", tZONE, HOUR ( 0) }, /* Universal (Coordinated) */
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{ "utc", tZONE, HOUR ( 0) },
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{ "wet", tZONE, HOUR ( 0) }, /* Western European */
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{ "bst", tDAYZONE, HOUR ( 0) }, /* British Summer */
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{ "wat", tZONE, HOUR ( 1) }, /* West Africa */
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{ "at", tZONE, HOUR ( 2) }, /* Azores */
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{ "ast", tZONE, HOUR ( 4) }, /* Atlantic Standard */
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{ "adt", tDAYZONE, HOUR ( 4) }, /* Atlantic Daylight */
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{ "est", tZONE, HOUR ( 5) }, /* Eastern Standard */
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{ "edt", tDAYZONE, HOUR ( 5) }, /* Eastern Daylight */
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{ "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 */
|
||
{ "zp4", tZONE, -HOUR (4) }, /* USSR Zone 3 */
|
||
{ "zp5", tZONE, -HOUR (5) }, /* USSR Zone 4 */
|
||
{ "zp6", tZONE, -HOUR (6) }, /* USSR Zone 5 */
|
||
{ "wast", tZONE, -HOUR (7) }, /* West Australian Standard */
|
||
{ "wadt", tDAYZONE, -HOUR (7) }, /* West Australian Daylight */
|
||
{ "cct", tZONE, -HOUR (8) }, /* China Coast, USSR Zone 7 */
|
||
{ "jst", tZONE, -HOUR (9) }, /* Japan Standard, USSR Zone 8 */
|
||
{ "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 }
|
||
};
|
||
|
||
|
||
|
||
|
||
static int yyerror (unused const char *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 char *p;
|
||
register char *q;
|
||
register const TABLE *tp;
|
||
int i;
|
||
bool abbrev;
|
||
|
||
/* Make it lowercase. */
|
||
for (p = buff; '\0' != *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 = true;
|
||
else if (strlen (buff) == 4 && buff[3] == '.')
|
||
{
|
||
abbrev = true;
|
||
buff[3] = '\0';
|
||
}
|
||
else
|
||
abbrev = false;
|
||
|
||
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; '\0' != *q; q++)
|
||
if (*q != '.')
|
||
*p++ = *q;
|
||
else
|
||
i++;
|
||
*p = '\0';
|
||
if (0 != i)
|
||
for (tp = TimezoneTable; NULL != tp->name; tp++)
|
||
if (strcmp (buff, tp->name) == 0)
|
||
{
|
||
yylval.Number = tp->value;
|
||
return tp->type;
|
||
}
|
||
|
||
return tID;
|
||
}
|
||
|
||
static int
|
||
yylex (void)
|
||
{
|
||
register char c;
|
||
register 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 (0 != 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 (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));
|
||
}
|
||
|
||
time_t get_date (const char *p, const time_t *now)
|
||
{
|
||
struct tm tm, tm0, *tmp;
|
||
time_t Start;
|
||
|
||
yyInput = p;
|
||
Start = now ? *now : time ((time_t *) NULL);
|
||
tmp = localtime (&Start);
|
||
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 != 0) ||
|
||
( (yyHaveRel != 0) && (yyHaveDate == 0) && (yyHaveDay == 0) ))
|
||
{
|
||
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 (ac, av)
|
||
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])
|
||
{
|
||
d = get_date (buff, (time_t *) NULL);
|
||
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) */
|