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890 lines
20 KiB
Plaintext
890 lines
20 KiB
Plaintext
%{
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/* $OpenBSD: date.y,v 1.27 2023/03/08 04:43:10 guenther Exp $ */
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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 10 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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/* SUPPRESS 287 on yaccpar_sccsid *//* Unused static variable */
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/* SUPPRESS 288 on yyerrlab *//* Label unused */
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#include <ctype.h>
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#include <string.h>
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#include <time.h>
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#include "cvs.h"
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#define YEAR_EPOCH 1970
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#define YEAR_TMORIGIN 1900
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#define HOUR(x) ((time_t)(x) * 60)
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#define SECSPERDAY (24L * 60L * 60L)
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/* An entry in the lexical lookup table */
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typedef struct _TABLE {
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char *name;
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int type;
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time_t value;
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} TABLE;
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/* Daylight-savings mode: on, off, or not yet known. */
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typedef enum _DSTMODE {
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DSTon, DSToff, DSTmaybe
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} DSTMODE;
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/* Meridian: am, pm, or 24-hour style. */
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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 DSTMODE yyDSTmode;
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static time_t yyDayOrdinal;
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static time_t 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 time_t yyTimezone;
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static time_t yyDay;
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static time_t yyHour;
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static time_t yyMinutes;
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static time_t yyMonth;
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static time_t yySeconds;
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static time_t yyYear;
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static MERIDIAN yyMeridian;
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static time_t yyRelMonth;
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static time_t yyRelSeconds;
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static int yyerror(const char *);
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static int yylex(void);
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static int yyparse(void);
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static int lookup(char *);
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%}
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%union {
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time_t Number;
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enum _MERIDIAN Meridian;
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}
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%token tAGO tDAY tDAYZONE tID tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT
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%token tSEC_UNIT tSNUMBER tUNUMBER tZONE tDST
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%type <Number> tDAY tDAYZONE tMINUTE_UNIT tMONTH tMONTH_UNIT
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%type <Number> tSEC_UNIT tSNUMBER tUNUMBER 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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yyDSTmode = DSToff;
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yyTimezone = - ($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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yyDSTmode = DSToff;
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yyTimezone = - ($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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yyDSTmode = DSToff;
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}
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| tDAYZONE {
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yyTimezone = $1;
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yyDSTmode = DSTon;
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}
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| tZONE tDST {
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yyTimezone = $1;
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yyDSTmode = DSTon;
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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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if ($1 >= 100) {
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yyYear = $1;
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yyMonth = $3;
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yyDay = $5;
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} else {
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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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yyRelMonth = -yyRelMonth;
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}
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| relunit
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;
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relunit : tUNUMBER tMINUTE_UNIT {
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yyRelSeconds += $1 * $2 * 60L;
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}
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| tSNUMBER tMINUTE_UNIT {
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yyRelSeconds += $1 * $2 * 60L;
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}
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| tMINUTE_UNIT {
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yyRelSeconds += $1 * 60L;
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}
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| tSNUMBER tSEC_UNIT {
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yyRelSeconds += $1;
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}
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| tUNUMBER tSEC_UNIT {
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yyRelSeconds += $1;
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}
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| tSEC_UNIT {
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yyRelSeconds++;
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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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| tUNUMBER tMONTH_UNIT {
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yyRelMonth += $1 * $2;
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}
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| tMONTH_UNIT {
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yyRelMonth += $1;
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}
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;
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number : tUNUMBER {
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if (yyHaveTime && yyHaveDate && !yyHaveRel)
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yyYear = $1;
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else {
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if ($1 > 10000) {
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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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} else {
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yyHaveTime++;
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if ($1 < 100) {
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yyHour = $1;
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yyMinutes = 0;
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} else {
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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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$$ = MER24;
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}
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| tMERIDIAN {
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$$ = $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 }
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};
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/* Time units table. */
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static TABLE const UnitsTable[] = {
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{ "year", tMONTH_UNIT, 12 },
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{ "month", tMONTH_UNIT, 1 },
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{ "fortnight", tMINUTE_UNIT, 14 * 24 * 60 },
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{ "week", tMINUTE_UNIT, 7 * 24 * 60 },
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{ "day", tMINUTE_UNIT, 1 * 24 * 60 },
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{ "hour", tMINUTE_UNIT, 60 },
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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 }
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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 }
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};
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/* The timezone table. */
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/* Some of these are commented out because a time_t can't store a float. */
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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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#if 0
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/* For completeness. BST is also British Summer, and GST is
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* also Guam Standard. */
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{ "bst", tZONE, HOUR( 3) }, /* Brazil Standard */
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{ "gst", tZONE, HOUR( 3) }, /* Greenland Standard */
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#endif
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#if 0
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{ "nft", tZONE, HOUR(3.5) }, /* Newfoundland */
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{ "nst", tZONE, HOUR(3.5) }, /* Newfoundland Standard */
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{ "ndt", tDAYZONE, HOUR(3.5) }, /* Newfoundland Daylight */
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#endif
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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 */
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{ "cdt", tDAYZONE, HOUR( 6) }, /* Central Daylight */
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{ "mst", tZONE, HOUR( 7) }, /* Mountain Standard */
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{ "mdt", tDAYZONE, HOUR( 7) }, /* Mountain Daylight */
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{ "pst", tZONE, HOUR( 8) }, /* Pacific Standard */
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{ "pdt", tDAYZONE, HOUR( 8) }, /* Pacific Daylight */
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{ "yst", tZONE, HOUR( 9) }, /* Yukon Standard */
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{ "ydt", tDAYZONE, HOUR( 9) }, /* Yukon Daylight */
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{ "hst", tZONE, HOUR(10) }, /* Hawaii Standard */
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{ "hdt", tDAYZONE, HOUR(10) }, /* Hawaii Daylight */
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{ "cat", tZONE, HOUR(10) }, /* Central Alaska */
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{ "ahst", tZONE, HOUR(10) }, /* Alaska-Hawaii Standard */
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{ "nt", tZONE, HOUR(11) }, /* Nome */
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{ "idlw", tZONE, HOUR(12) }, /* International Date Line West */
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{ "cet", tZONE, -HOUR(1) }, /* Central European */
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{ "met", tZONE, -HOUR(1) }, /* Middle European */
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{ "mewt", tZONE, -HOUR(1) }, /* Middle European Winter */
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{ "mest", tDAYZONE, -HOUR(1) }, /* Middle European Summer */
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{ "swt", tZONE, -HOUR(1) }, /* Swedish Winter */
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{ "sst", tDAYZONE, -HOUR(1) }, /* Swedish Summer */
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{ "fwt", tZONE, -HOUR(1) }, /* French Winter */
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{ "fst", tDAYZONE, -HOUR(1) }, /* French Summer */
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{ "eet", tZONE, -HOUR(2) }, /* Eastern Europe, USSR Zone 1 */
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{ "bt", tZONE, -HOUR(3) }, /* Baghdad, USSR Zone 2 */
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#if 0
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{ "it", tZONE, -HOUR(3.5) },/* Iran */
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#endif
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{ "zp4", tZONE, -HOUR(4) }, /* USSR Zone 3 */
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{ "zp5", tZONE, -HOUR(5) }, /* USSR Zone 4 */
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#if 0
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{ "ist", tZONE, -HOUR(5.5) },/* Indian Standard */
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#endif
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{ "zp6", tZONE, -HOUR(6) }, /* USSR Zone 5 */
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#if 0
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/* For completeness. NST is also Newfoundland Stanard, and SST is
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* also Swedish Summer. */
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{ "nst", tZONE, -HOUR(6.5) },/* North Sumatra */
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{ "sst", tZONE, -HOUR(7) }, /* South Sumatra, USSR Zone 6 */
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#endif /* 0 */
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{ "wast", tZONE, -HOUR(7) }, /* West Australian Standard */
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{ "wadt", tDAYZONE, -HOUR(7) }, /* West Australian Daylight */
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#if 0
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{ "jt", tZONE, -HOUR(7.5) },/* Java (3pm in Cronusland!) */
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#endif
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{ "cct", tZONE, -HOUR(8) }, /* China Coast, USSR Zone 7 */
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{ "jst", tZONE, -HOUR(9) }, /* Japan Standard, USSR Zone 8 */
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#if 0
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{ "cast", tZONE, -HOUR(9.5) },/* Central Australian Standard */
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{ "cadt", tDAYZONE, -HOUR(9.5) },/* Central Australian Daylight */
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#endif
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{ "east", tZONE, -HOUR(10) }, /* Eastern Australian Standard */
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{ "eadt", tDAYZONE, -HOUR(10) }, /* Eastern Australian Daylight */
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{ "gst", tZONE, -HOUR(10) }, /* Guam Standard, USSR Zone 9 */
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{ "nzt", tZONE, -HOUR(12) }, /* New Zealand */
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{ "nzst", tZONE, -HOUR(12) }, /* New Zealand Standard */
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{ "nzdt", tDAYZONE, -HOUR(12) }, /* New Zealand Daylight */
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{ "idle", tZONE, -HOUR(12) }, /* International Date Line East */
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{ NULL }
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};
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/* Military timezone table. */
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static TABLE const MilitaryTable[] = {
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{ "a", tZONE, HOUR( 1) },
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{ "b", tZONE, HOUR( 2) },
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{ "c", tZONE, HOUR( 3) },
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{ "d", tZONE, HOUR( 4) },
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{ "e", tZONE, HOUR( 5) },
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{ "f", tZONE, HOUR( 6) },
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{ "g", tZONE, HOUR( 7) },
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{ "h", tZONE, HOUR( 8) },
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{ "i", tZONE, HOUR( 9) },
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{ "k", tZONE, HOUR( 10) },
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{ "l", tZONE, HOUR( 11) },
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{ "m", tZONE, HOUR( 12) },
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{ "n", tZONE, HOUR(- 1) },
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{ "o", tZONE, HOUR(- 2) },
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{ "p", tZONE, HOUR(- 3) },
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{ "q", tZONE, HOUR(- 4) },
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{ "r", tZONE, HOUR(- 5) },
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{ "s", tZONE, HOUR(- 6) },
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{ "t", tZONE, HOUR(- 7) },
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{ "u", tZONE, HOUR(- 8) },
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{ "v", tZONE, HOUR(- 9) },
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{ "w", tZONE, HOUR(-10) },
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{ "x", tZONE, HOUR(-11) },
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{ "y", tZONE, HOUR(-12) },
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{ "z", tZONE, HOUR( 0) },
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{ NULL }
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};
|
|
|
|
|
|
static int
|
|
yyerror(const char *s)
|
|
{
|
|
#if !defined(TEST)
|
|
char *str;
|
|
|
|
(void)xasprintf(&str, "parsing date string: %s", s);
|
|
cvs_log(LP_ERR, "%s", str);
|
|
free(str);
|
|
#endif
|
|
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:
|
|
return (-1);
|
|
}
|
|
/* 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;
|
|
if (Year < YEAR_EPOCH)
|
|
Year += 100;
|
|
}
|
|
DaysInMonth[1] = Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0)
|
|
? 29 : 28;
|
|
/* XXX Sloppily check for 2038 if time_t is 32 bits */
|
|
if (Year < YEAR_EPOCH ||
|
|
(sizeof(time_t) == sizeof(int) && 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 = YEAR_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
|
|
lookup(char *buff)
|
|
{
|
|
size_t len;
|
|
char *p, *q;
|
|
int i, abbrev;
|
|
const TABLE *tp;
|
|
|
|
/* 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);
|
|
}
|
|
|
|
len = strlen(buff);
|
|
/* See if we have an abbreviation for a month. */
|
|
if (len == 3)
|
|
abbrev = 1;
|
|
else if (len == 4 && buff[3] == '.') {
|
|
abbrev = 1;
|
|
buff[3] = '\0';
|
|
--len;
|
|
} 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. */
|
|
if (len != 0 && buff[len - 1] == 's') {
|
|
buff[len - 1] = '\0';
|
|
for (tp = UnitsTable; tp->name; tp++)
|
|
if (strcmp(buff, tp->name) == 0) {
|
|
yylval.Number = tp->value;
|
|
return (tp->type);
|
|
}
|
|
buff[len - 1] = '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 (len == 1 && 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, *p, buff[20];
|
|
int count, 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 lookup(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);
|
|
}
|
|
}
|
|
|
|
/* Yield A - B, measured in seconds. */
|
|
static long
|
|
difftm(struct tm *a, struct tm *b)
|
|
{
|
|
int ay = a->tm_year + (YEAR_TMORIGIN - 1);
|
|
int by = b->tm_year + (YEAR_TMORIGIN - 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));
|
|
}
|
|
|
|
/*
|
|
* date_parse()
|
|
*
|
|
* Returns the number of seconds since the Epoch corresponding to the date.
|
|
*/
|
|
time_t
|
|
date_parse(const char *p)
|
|
{
|
|
struct tm gmt, tm;
|
|
time_t Start, tod, nowtime, tz;
|
|
|
|
yyInput = p;
|
|
|
|
if (time(&nowtime) == -1 || !gmtime_r(&nowtime, &gmt) ||
|
|
!localtime_r(&nowtime, &tm))
|
|
return -1;
|
|
|
|
tz = difftm(&gmt, &tm) / 60;
|
|
|
|
if (tm.tm_isdst)
|
|
tz += 60;
|
|
|
|
yyYear = tm.tm_year + 1900;
|
|
yyMonth = tm.tm_mon + 1;
|
|
yyDay = tm.tm_mday;
|
|
yyTimezone = tz;
|
|
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;
|
|
}
|
|
|
|
return Start;
|
|
}
|
|
|
|
#if defined(TEST)
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
char buff[128];
|
|
time_t d;
|
|
|
|
(void)printf("Enter date, or blank line to exit.\n\t> ");
|
|
(void)fflush(stdout);
|
|
while (fgets(buff, sizeof(buff), stdin) && buff[0]) {
|
|
d = date_parse(buff);
|
|
if (d == -1)
|
|
(void)printf("Bad format - couldn't convert.\n");
|
|
else
|
|
(void)printf("%s", ctime(&d));
|
|
(void)printf("\t> ");
|
|
(void)fflush(stdout);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
#endif /* defined(TEST) */
|