2bb9582faf
when parsing dates. PR: bin/104934: bug in some date handling of bsdtar Reported by: Herve Boulouis MFC after: 3 days
811 lines
19 KiB
Plaintext
811 lines
19 KiB
Plaintext
%{
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/*
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* March 2005: Further modified and simplified by Tim Kientzle:
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* Eliminate minutes-based calculations (just do everything in
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* seconds), have lexer only recognize unsigned integers (handle '+'
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* and '-' characters in grammar), combine tables into one table with
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* explicit abbreviation notes, do am/pm adjustments in the grammar
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* (eliminate some state variables and post-processing). Among other
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* things, these changes eliminated two shift/reduce conflicts. (Went
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* from 10 to 8.)
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*/
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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 $alz
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** <rsalz@bbn.com> and Jim Berets <jberets@bbn.com> in August, 1990;
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**
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** This grammar has 10 shift/reduce conflicts.
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**
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** This code is in the public domain and has no copyright.
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*/
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/* SUPPRESS 287 on yaccpar_sccsid *//* Unused static variable */
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/* SUPPRESS 288 on yyerrlab *//* Label unused */
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#ifdef __FreeBSD__
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#endif
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#include <ctype.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#define yyparse getdate_yyparse
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#define yylex getdate_yylex
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#define yyerror getdate_yyerror
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static int yyparse(void);
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static int yylex(void);
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static int yyerror(const char *);
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time_t get_date(char *);
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#define EPOCH 1970
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#define HOUR(x) ((time_t)(x) * 60)
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#define SECSPERDAY (24L * 60L * 60L)
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/*
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** Daylight-savings mode: on, off, or not yet known.
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*/
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typedef enum _DSTMODE {
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DSTon, DSToff, DSTmaybe
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} DSTMODE;
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/*
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** Meridian: am or pm.
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*/
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enum { tAM, tPM };
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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 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 time_t yyRelMonth;
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static time_t yyRelSeconds;
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%}
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%union {
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time_t Number;
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}
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%token tAGO tDAY tDAYZONE tAMPM tMONTH tMONTH_UNIT tSEC_UNIT tUNUMBER
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%token tZONE tDST
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%type <Number> tDAY tDAYZONE tMONTH tMONTH_UNIT
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%type <Number> tSEC_UNIT tUNUMBER tZONE tAMPM
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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 { yyHaveTime++; }
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| zone { yyHaveZone++; }
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| date { yyHaveDate++; }
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| day { yyHaveDay++; }
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| rel { yyHaveRel++; }
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| number
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;
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time : tUNUMBER tAMPM {
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/* "7am" */
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yyHour = $1;
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if (yyHour == 12)
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yyHour = 0;
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yyMinutes = 0;
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yySeconds = 0;
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if ($2 == tPM)
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yyHour += 12;
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}
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| bare_time {
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/* "7:12:18" "19:17" */
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}
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| bare_time tAMPM {
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/* "7:12pm", "12:20:13am" */
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if (yyHour == 12)
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yyHour = 0;
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if ($2 == tPM)
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yyHour += 12;
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}
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| bare_time '+' tUNUMBER {
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/* "7:14+0700" */
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yyDSTmode = DSToff;
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yyTimezone = - ($3 % 100 + ($3 / 100) * 60);
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}
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| bare_time '-' tUNUMBER {
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/* "19:14:12-0530" */
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yyDSTmode = DSToff;
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yyTimezone = + ($3 % 100 + ($3 / 100) * 60);
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}
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;
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bare_time : tUNUMBER ':' tUNUMBER {
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yyHour = $1;
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yyMinutes = $3;
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yySeconds = 0;
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}
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| tUNUMBER ':' tUNUMBER ':' tUNUMBER {
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yyHour = $1;
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yyMinutes = $3;
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yySeconds = $5;
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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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/* "tue," "wednesday," */
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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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/* "second tues" "3 wed" */
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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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/* "1/15" */
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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 >= 13) {
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/* First number is big: 2004/01/29, 99/02/17 */
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yyYear = $1;
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yyMonth = $3;
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yyDay = $5;
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} else if (($5 >= 13) || ($3 >= 13)) {
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/* Last number is big: 01/07/98 */
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/* Middle number is big: 01/29/04 */
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yyMonth = $1;
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yyDay = $3;
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yyYear = $5;
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} else {
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/* No significant clues: 02/03/04 */
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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 '-' tUNUMBER '-' tUNUMBER {
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/* ISO 8601 format. yyyy-mm-dd. */
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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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| tUNUMBER '-' tMONTH '-' tUNUMBER {
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if ($1 > 31) {
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/* e.g. 1992-Jun-17 */
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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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/* e.g. 17-JUN-1992. */
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yyDay = $1;
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yyMonth = $3;
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yyYear = $5;
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}
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}
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| tMONTH tUNUMBER {
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/* "May 3" */
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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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/* "June 17, 2001" */
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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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/* "12 Sept" */
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yyDay = $1;
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yyMonth = $2;
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}
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| tUNUMBER tMONTH tUNUMBER {
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/* "12 Sept 1997" */
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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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;
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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 tSEC_UNIT {
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/* "-3 hours" */
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yyRelSeconds -= $2 * $3;
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}
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| '+' tUNUMBER tSEC_UNIT {
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/* "+1 minute" */
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yyRelSeconds += $2 * $3;
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}
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| tUNUMBER tSEC_UNIT {
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/* "1 day" */
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yyRelSeconds += $1 * $2;
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}
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| tSEC_UNIT {
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/* "hour" */
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yyRelSeconds += $1;
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}
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| '-' tUNUMBER tMONTH_UNIT {
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/* "-3 months" */
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yyRelMonth -= $2 * $3;
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}
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| '+' tUNUMBER tMONTH_UNIT {
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/* "+5 years" */
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yyRelMonth += $2 * $3;
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}
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| tUNUMBER tMONTH_UNIT {
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/* "2 years" */
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yyRelMonth += $1 * $2;
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}
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| tMONTH_UNIT {
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/* "6 months" */
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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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/* "20040301" */
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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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/* "513" is same as "5:13" */
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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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}
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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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}
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}
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}
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;
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%%
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static struct TABLE {
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size_t abbrev;
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const char *name;
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int type;
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time_t value;
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} const TimeWords[] = {
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/* am/pm */
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{ 0, "am", tAMPM, tAM },
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{ 0, "pm", tAMPM, tPM },
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/* Month names. */
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{ 3, "january", tMONTH, 1 },
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{ 3, "february", tMONTH, 2 },
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{ 3, "march", tMONTH, 3 },
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{ 3, "april", tMONTH, 4 },
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{ 3, "may", tMONTH, 5 },
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{ 3, "june", tMONTH, 6 },
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{ 3, "july", tMONTH, 7 },
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{ 3, "august", tMONTH, 8 },
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{ 3, "september", tMONTH, 9 },
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{ 3, "october", tMONTH, 10 },
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{ 3, "november", tMONTH, 11 },
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{ 3, "december", tMONTH, 12 },
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/* Days of the week. */
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{ 2, "sunday", tDAY, 0 },
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{ 3, "monday", tDAY, 1 },
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{ 2, "tuesday", tDAY, 2 },
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{ 3, "wednesday", tDAY, 3 },
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{ 2, "thursday", tDAY, 4 },
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{ 2, "friday", tDAY, 5 },
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{ 2, "saturday", tDAY, 6 },
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/* Timezones: Offsets are in minutes. */
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{ 0, "gmt", tZONE, HOUR( 0) }, /* Greenwich Mean */
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{ 0, "ut", tZONE, HOUR( 0) }, /* Universal (Coordinated) */
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{ 0, "utc", tZONE, HOUR( 0) },
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{ 0, "wet", tZONE, HOUR( 0) }, /* Western European */
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{ 0, "bst", tDAYZONE, HOUR( 0) }, /* British Summer */
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{ 0, "wat", tZONE, HOUR( 1) }, /* West Africa */
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{ 0, "at", tZONE, HOUR( 2) }, /* Azores */
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/* { 0, "bst", tZONE, HOUR( 3) }, */ /* Brazil Standard: Conflict */
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/* { 0, "gst", tZONE, HOUR( 3) }, */ /* Greenland Standard: Conflict*/
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{ 0, "nft", tZONE, HOUR(3)+30 }, /* Newfoundland */
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{ 0, "nst", tZONE, HOUR(3)+30 }, /* Newfoundland Standard */
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{ 0, "ndt", tDAYZONE, HOUR(3)+30 }, /* Newfoundland Daylight */
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{ 0, "ast", tZONE, HOUR( 4) }, /* Atlantic Standard */
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{ 0, "adt", tDAYZONE, HOUR( 4) }, /* Atlantic Daylight */
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{ 0, "est", tZONE, HOUR( 5) }, /* Eastern Standard */
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{ 0, "edt", tDAYZONE, HOUR( 5) }, /* Eastern Daylight */
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{ 0, "cst", tZONE, HOUR( 6) }, /* Central Standard */
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{ 0, "cdt", tDAYZONE, HOUR( 6) }, /* Central Daylight */
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{ 0, "mst", tZONE, HOUR( 7) }, /* Mountain Standard */
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{ 0, "mdt", tDAYZONE, HOUR( 7) }, /* Mountain Daylight */
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{ 0, "pst", tZONE, HOUR( 8) }, /* Pacific Standard */
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{ 0, "pdt", tDAYZONE, HOUR( 8) }, /* Pacific Daylight */
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{ 0, "yst", tZONE, HOUR( 9) }, /* Yukon Standard */
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{ 0, "ydt", tDAYZONE, HOUR( 9) }, /* Yukon Daylight */
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{ 0, "hst", tZONE, HOUR(10) }, /* Hawaii Standard */
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{ 0, "hdt", tDAYZONE, HOUR(10) }, /* Hawaii Daylight */
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{ 0, "cat", tZONE, HOUR(10) }, /* Central Alaska */
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{ 0, "ahst", tZONE, HOUR(10) }, /* Alaska-Hawaii Standard */
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{ 0, "nt", tZONE, HOUR(11) }, /* Nome */
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{ 0, "idlw", tZONE, HOUR(12) }, /* Intl Date Line West */
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{ 0, "cet", tZONE, -HOUR(1) }, /* Central European */
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{ 0, "met", tZONE, -HOUR(1) }, /* Middle European */
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{ 0, "mewt", tZONE, -HOUR(1) }, /* Middle European Winter */
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{ 0, "mest", tDAYZONE, -HOUR(1) }, /* Middle European Summer */
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{ 0, "swt", tZONE, -HOUR(1) }, /* Swedish Winter */
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{ 0, "sst", tDAYZONE, -HOUR(1) }, /* Swedish Summer */
|
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{ 0, "fwt", tZONE, -HOUR(1) }, /* French Winter */
|
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{ 0, "fst", tDAYZONE, -HOUR(1) }, /* French Summer */
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{ 0, "eet", tZONE, -HOUR(2) }, /* Eastern Eur, USSR Zone 1 */
|
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{ 0, "bt", tZONE, -HOUR(3) }, /* Baghdad, USSR Zone 2 */
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||
{ 0, "it", tZONE, -HOUR(3)-30 },/* Iran */
|
||
{ 0, "zp4", tZONE, -HOUR(4) }, /* USSR Zone 3 */
|
||
{ 0, "zp5", tZONE, -HOUR(5) }, /* USSR Zone 4 */
|
||
{ 0, "ist", tZONE, -HOUR(5)-30 },/* Indian Standard */
|
||
{ 0, "zp6", tZONE, -HOUR(6) }, /* USSR Zone 5 */
|
||
/* { 0, "nst", tZONE, -HOUR(6.5) }, */ /* North Sumatra: Conflict */
|
||
/* { 0, "sst", tZONE, -HOUR(7) }, */ /* So Sumatra, USSR 6: Conflict */
|
||
{ 0, "wast", tZONE, -HOUR(7) }, /* West Australian Standard */
|
||
{ 0, "wadt", tDAYZONE, -HOUR(7) }, /* West Australian Daylight */
|
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{ 0, "jt", tZONE, -HOUR(7)-30 },/* Java (3pm in Cronusland!)*/
|
||
{ 0, "cct", tZONE, -HOUR(8) }, /* China Coast, USSR Zone 7 */
|
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{ 0, "jst", tZONE, -HOUR(9) }, /* Japan Std, USSR Zone 8 */
|
||
{ 0, "cast", tZONE, -HOUR(9)-30 },/* Central Australian Std */
|
||
{ 0, "cadt", tDAYZONE, -HOUR(9)-30 },/* Central Australian Daylt */
|
||
{ 0, "east", tZONE, -HOUR(10) }, /* Eastern Australian Std */
|
||
{ 0, "eadt", tDAYZONE, -HOUR(10) }, /* Eastern Australian Daylt */
|
||
{ 0, "gst", tZONE, -HOUR(10) }, /* Guam Std, USSR Zone 9 */
|
||
{ 0, "nzt", tZONE, -HOUR(12) }, /* New Zealand */
|
||
{ 0, "nzst", tZONE, -HOUR(12) }, /* New Zealand Standard */
|
||
{ 0, "nzdt", tDAYZONE, -HOUR(12) }, /* New Zealand Daylight */
|
||
{ 0, "idle", tZONE, -HOUR(12) }, /* Intl Date Line East */
|
||
|
||
{ 0, "dst", tDST, 0 },
|
||
|
||
/* Time units. */
|
||
{ 4, "years", tMONTH_UNIT, 12 },
|
||
{ 5, "months", tMONTH_UNIT, 1 },
|
||
{ 9, "fortnights", tSEC_UNIT, 14 * 24 * 60 * 60 },
|
||
{ 4, "weeks", tSEC_UNIT, 7 * 24 * 60 * 60 },
|
||
{ 3, "days", tSEC_UNIT, 1 * 24 * 60 * 60 },
|
||
{ 4, "hours", tSEC_UNIT, 60 * 60 },
|
||
{ 3, "minutes", tSEC_UNIT, 60 },
|
||
{ 3, "seconds", tSEC_UNIT, 1 },
|
||
|
||
/* Relative-time words. */
|
||
{ 0, "tomorrow", tSEC_UNIT, 1 * 24 * 60 * 60 },
|
||
{ 0, "yesterday", tSEC_UNIT, -1 * 24 * 60 * 60 },
|
||
{ 0, "today", tSEC_UNIT, 0 },
|
||
{ 0, "now", tSEC_UNIT, 0 },
|
||
{ 0, "last", tUNUMBER, -1 },
|
||
{ 0, "this", tSEC_UNIT, 0 },
|
||
{ 0, "next", tUNUMBER, 2 },
|
||
{ 0, "first", tUNUMBER, 1 },
|
||
{ 0, "1st", tUNUMBER, 1 },
|
||
/* { 0, "second", tUNUMBER, 2 }, */
|
||
{ 0, "2nd", tUNUMBER, 2 },
|
||
{ 0, "third", tUNUMBER, 3 },
|
||
{ 0, "3rd", tUNUMBER, 3 },
|
||
{ 0, "fourth", tUNUMBER, 4 },
|
||
{ 0, "4th", tUNUMBER, 4 },
|
||
{ 0, "fifth", tUNUMBER, 5 },
|
||
{ 0, "5th", tUNUMBER, 5 },
|
||
{ 0, "sixth", tUNUMBER, 6 },
|
||
{ 0, "seventh", tUNUMBER, 7 },
|
||
{ 0, "eighth", tUNUMBER, 8 },
|
||
{ 0, "ninth", tUNUMBER, 9 },
|
||
{ 0, "tenth", tUNUMBER, 10 },
|
||
{ 0, "eleventh", tUNUMBER, 11 },
|
||
{ 0, "twelfth", tUNUMBER, 12 },
|
||
{ 0, "ago", tAGO, 1 },
|
||
|
||
/* Military timezones. */
|
||
{ 0, "a", tZONE, HOUR( 1) },
|
||
{ 0, "b", tZONE, HOUR( 2) },
|
||
{ 0, "c", tZONE, HOUR( 3) },
|
||
{ 0, "d", tZONE, HOUR( 4) },
|
||
{ 0, "e", tZONE, HOUR( 5) },
|
||
{ 0, "f", tZONE, HOUR( 6) },
|
||
{ 0, "g", tZONE, HOUR( 7) },
|
||
{ 0, "h", tZONE, HOUR( 8) },
|
||
{ 0, "i", tZONE, HOUR( 9) },
|
||
{ 0, "k", tZONE, HOUR( 10) },
|
||
{ 0, "l", tZONE, HOUR( 11) },
|
||
{ 0, "m", tZONE, HOUR( 12) },
|
||
{ 0, "n", tZONE, HOUR(- 1) },
|
||
{ 0, "o", tZONE, HOUR(- 2) },
|
||
{ 0, "p", tZONE, HOUR(- 3) },
|
||
{ 0, "q", tZONE, HOUR(- 4) },
|
||
{ 0, "r", tZONE, HOUR(- 5) },
|
||
{ 0, "s", tZONE, HOUR(- 6) },
|
||
{ 0, "t", tZONE, HOUR(- 7) },
|
||
{ 0, "u", tZONE, HOUR(- 8) },
|
||
{ 0, "v", tZONE, HOUR(- 9) },
|
||
{ 0, "w", tZONE, HOUR(-10) },
|
||
{ 0, "x", tZONE, HOUR(-11) },
|
||
{ 0, "y", tZONE, HOUR(-12) },
|
||
{ 0, "z", tZONE, HOUR( 0) },
|
||
|
||
/* End of table. */
|
||
{ 0, NULL, 0, 0 }
|
||
};
|
||
|
||
|
||
|
||
|
||
/* ARGSUSED */
|
||
static int
|
||
yyerror(const char *s)
|
||
{
|
||
(void)s;
|
||
return 0;
|
||
}
|
||
|
||
static time_t
|
||
ToSeconds(time_t Hours, time_t Minutes, time_t Seconds)
|
||
{
|
||
if (Minutes < 0 || Minutes > 59 || Seconds < 0 || Seconds > 59)
|
||
return -1;
|
||
if (Hours < 0 || Hours > 23)
|
||
return -1;
|
||
return (Hours * 60L + Minutes) * 60L + Seconds;
|
||
}
|
||
|
||
|
||
/* Year is either
|
||
* A number from 0 to 99, which means a year from 1970 to 2069, 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, 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 < 69)
|
||
Year += 2000;
|
||
else if (Year < 100)
|
||
Year += 1900;
|
||
DaysInMonth[1] = Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0)
|
||
? 29 : 28;
|
||
/* Checking for 2038 bogusly assumes that time_t is 32 bits. But
|
||
I'm too lazy to try to check for time_t overflow in another way. */
|
||
if (Year < EPOCH || Year > 2038
|
||
|| Month < 1 || Month > 12
|
||
/* Lint fluff: "conversion from long may lose accuracy" */
|
||
|| Day < 1 || Day > DaysInMonth[(int)--Month])
|
||
return -1;
|
||
|
||
Julian = Day - 1;
|
||
for (i = 0; i < Month; i++)
|
||
Julian += DaysInMonth[i];
|
||
for (i = EPOCH; i < Year; i++)
|
||
Julian += 365 + (i % 4 == 0);
|
||
Julian *= SECSPERDAY;
|
||
Julian += yyTimezone * 60L;
|
||
if ((tod = ToSeconds(Hours, Minutes, Seconds)) < 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,
|
||
DSTmaybe));
|
||
}
|
||
|
||
static int
|
||
yylex(void)
|
||
{
|
||
char c;
|
||
char buff[64];
|
||
|
||
for ( ; ; ) {
|
||
while (isspace(*yyInput))
|
||
yyInput++;
|
||
|
||
/* Skip parenthesized comments. */
|
||
if (*yyInput == '(') {
|
||
int Count = 0;
|
||
do {
|
||
c = *yyInput++;
|
||
if (c == '\0')
|
||
return c;
|
||
if (c == '(')
|
||
Count++;
|
||
else if (c == ')')
|
||
Count--;
|
||
} while (Count > 0);
|
||
continue;
|
||
}
|
||
|
||
/* Try the next token in the word table first. */
|
||
/* This allows us to match "2nd", for example. */
|
||
{
|
||
char *src = yyInput;
|
||
const struct TABLE *tp;
|
||
unsigned i = 0;
|
||
|
||
/* Force to lowercase and strip '.' characters. */
|
||
while (*src != '\0'
|
||
&& (isalnum(*src) || *src == '.')
|
||
&& i < sizeof(buff)-1) {
|
||
if (*src != '.') {
|
||
if (isupper(*src))
|
||
buff[i++] = tolower(*src);
|
||
else
|
||
buff[i++] = *src;
|
||
}
|
||
src++;
|
||
}
|
||
buff[i++] = '\0';
|
||
|
||
/*
|
||
* Find the first match. If the word can be
|
||
* abbreviated, make sure we match at least
|
||
* the minimum abbreviation.
|
||
*/
|
||
for (tp = TimeWords; tp->name; tp++) {
|
||
size_t abbrev = tp->abbrev;
|
||
if (abbrev == 0)
|
||
abbrev = strlen(tp->name);
|
||
if (strlen(buff) >= abbrev
|
||
&& strncmp(tp->name, buff, strlen(buff))
|
||
== 0) {
|
||
/* Skip over token. */
|
||
yyInput = src;
|
||
/* Return the match. */
|
||
yylval.Number = tp->value;
|
||
return tp->type;
|
||
}
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Not in the word table, maybe it's a number. Note:
|
||
* Because '-' and '+' have other special meanings, I
|
||
* don't deal with signed numbers here.
|
||
*/
|
||
if (isdigit(c = *yyInput)) {
|
||
for (yylval.Number = 0; isdigit(c = *yyInput++); )
|
||
yylval.Number = 10 * yylval.Number + c - '0';
|
||
yyInput--;
|
||
return (tUNUMBER);
|
||
}
|
||
|
||
return (*yyInput++);
|
||
}
|
||
}
|
||
|
||
#define TM_YEAR_ORIGIN 1900
|
||
|
||
/* Yield A - B, measured in seconds. */
|
||
static long
|
||
difftm (struct tm *a, struct tm *b)
|
||
{
|
||
int ay = a->tm_year + (TM_YEAR_ORIGIN - 1);
|
||
int by = b->tm_year + (TM_YEAR_ORIGIN - 1);
|
||
int days = (
|
||
/* difference in day of year */
|
||
a->tm_yday - b->tm_yday
|
||
/* + intervening leap days */
|
||
+ ((ay >> 2) - (by >> 2))
|
||
- (ay/100 - by/100)
|
||
+ ((ay/100 >> 2) - (by/100 >> 2))
|
||
/* + difference in years * 365 */
|
||
+ (long)(ay-by) * 365
|
||
);
|
||
return (60*(60*(24*days + (a->tm_hour - b->tm_hour))
|
||
+ (a->tm_min - b->tm_min))
|
||
+ (a->tm_sec - b->tm_sec));
|
||
}
|
||
|
||
time_t
|
||
get_date(char *p)
|
||
{
|
||
struct tm *tm;
|
||
struct tm gmt, *gmt_ptr;
|
||
time_t Start;
|
||
time_t tod;
|
||
time_t nowtime;
|
||
long tzone;
|
||
|
||
memset(&gmt, 0, sizeof(gmt));
|
||
yyInput = p;
|
||
|
||
(void)time (&nowtime);
|
||
|
||
gmt_ptr = gmtime (&nowtime);
|
||
if (gmt_ptr != NULL) {
|
||
/* Copy, in case localtime and gmtime use the same buffer. */
|
||
gmt = *gmt_ptr;
|
||
}
|
||
|
||
if (! (tm = localtime (&nowtime)))
|
||
return -1;
|
||
|
||
if (gmt_ptr != NULL)
|
||
tzone = difftm (&gmt, tm) / 60;
|
||
else
|
||
/* This system doesn't understand timezones; fake it. */
|
||
tzone = 0;
|
||
if(tm->tm_isdst)
|
||
tzone += 60;
|
||
|
||
yyYear = tm->tm_year + 1900;
|
||
yyMonth = tm->tm_mon + 1;
|
||
yyDay = tm->tm_mday;
|
||
yyTimezone = tzone;
|
||
yyDSTmode = DSTmaybe;
|
||
yyHour = 0;
|
||
yyMinutes = 0;
|
||
yySeconds = 0;
|
||
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, yyDSTmode);
|
||
if (Start < 0)
|
||
return -1;
|
||
} else {
|
||
Start = nowtime;
|
||
if (!yyHaveRel)
|
||
Start -= ((tm->tm_hour * 60L + tm->tm_min) * 60L) + tm->tm_sec;
|
||
}
|
||
|
||
Start += yyRelSeconds;
|
||
Start += RelativeMonth(Start, yyRelMonth);
|
||
|
||
if (yyHaveDay && !yyHaveDate) {
|
||
tod = RelativeDate(Start, yyDayOrdinal, yyDayNumber);
|
||
Start += tod;
|
||
}
|
||
|
||
/* Have to do *something* with a legitimate -1 so it's
|
||
* distinguishable from the error return value. (Alternately
|
||
* could set errno on error.) */
|
||
return Start == -1 ? 0 : Start;
|
||
}
|
||
|
||
|
||
#if defined(TEST)
|
||
|
||
/* ARGSUSED */
|
||
int
|
||
main(int argc, char **argv)
|
||
{
|
||
time_t d;
|
||
|
||
while (*++argv != NULL) {
|
||
(void)printf("Input: %s\n", *argv);
|
||
d = get_date(*argv);
|
||
if (d == -1)
|
||
(void)printf("Bad format - couldn't convert.\n");
|
||
else
|
||
(void)printf("Output: %s\n", ctime(&d));
|
||
}
|
||
exit(0);
|
||
/* NOTREACHED */
|
||
}
|
||
#endif /* defined(TEST) */
|