984 lines
24 KiB
Plaintext
984 lines
24 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 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 <stdio.h>
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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 <util.h>
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#include <stdlib.h>
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/* NOTES on rebuilding parsedate.c (particularly for inclusion in CVS
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releases):
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We don't want to mess with all the portability hassles of alloca.
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In particular, most (all?) versions of bison will use alloca in
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their parser. If bison works on your system (e.g. it should work
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with gcc), then go ahead and use it, but the more general solution
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is to use byacc instead of bison, which should generate a portable
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parser. I played with adding "#define alloca dont_use_alloca", to
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give an error if the parser generator uses alloca (and thus detect
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unportable parsedate.c's), but that seems to cause as many problems
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as it solves. */
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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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** 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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time_t value;
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} TABLE;
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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, 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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struct dateinfo {
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DSTMODE yyDSTmode;
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time_t yyDayOrdinal;
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time_t yyDayNumber;
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int yyHaveDate;
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int yyHaveDay;
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int yyHaveRel;
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int yyHaveTime;
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int yyHaveZone;
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time_t yyTimezone;
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time_t yyDay;
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time_t yyHour;
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time_t yyMinutes;
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time_t yyMonth;
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time_t yySeconds;
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time_t yyYear;
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MERIDIAN yyMeridian;
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time_t yyRelMonth;
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time_t yyRelSeconds;
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};
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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 AT_SIGN
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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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%parse-param { struct dateinfo *param }
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%parse-param { const char **yyInput }
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%lex-param { const char **yyInput }
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%pure-parser
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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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param->yyHaveTime++;
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}
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| zone {
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param->yyHaveZone++;
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}
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| date {
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param->yyHaveDate++;
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}
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| day {
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param->yyHaveDay++;
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}
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| rel {
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param->yyHaveRel++;
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}
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| cvsstamp {
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param->yyHaveTime++;
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param->yyHaveDate++;
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param->yyHaveZone++;
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}
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| epochdate {
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param->yyHaveTime++;
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param->yyHaveDate++;
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param->yyHaveZone++;
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}
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| number
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;
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cvsstamp: tUNUMBER '.' tUNUMBER '.' tUNUMBER '.' tUNUMBER '.' tUNUMBER '.' tUNUMBER {
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param->yyYear = $1;
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if (param->yyYear < 100) param->yyYear += 1900;
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param->yyMonth = $3;
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param->yyDay = $5;
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param->yyHour = $7;
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param->yyMinutes = $9;
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param->yySeconds = $11;
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param->yyDSTmode = DSToff;
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param->yyTimezone = 0;
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}
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;
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epochdate: AT_SIGN tUNUMBER {
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time_t when = $2;
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struct tm tmbuf;
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if (gmtime_r(&when, &tmbuf) != NULL) {
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param->yyYear = tmbuf.tm_year + 1900;
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param->yyMonth = tmbuf.tm_mon + 1;
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param->yyDay = tmbuf.tm_mday;
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param->yyHour = tmbuf.tm_hour;
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param->yyMinutes = tmbuf.tm_min;
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param->yySeconds = tmbuf.tm_sec;
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} else {
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param->yyYear = EPOCH;
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param->yyMonth = 1;
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param->yyDay = 1;
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param->yyHour = 0;
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param->yyMinutes = 0;
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param->yySeconds = 0;
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}
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param->yyDSTmode = DSToff;
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param->yyTimezone = 0;
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}
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;
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time : tUNUMBER tMERIDIAN {
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param->yyHour = $1;
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param->yyMinutes = 0;
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param->yySeconds = 0;
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param->yyMeridian = $2;
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}
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| tUNUMBER ':' tUNUMBER o_merid {
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param->yyHour = $1;
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param->yyMinutes = $3;
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param->yySeconds = 0;
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param->yyMeridian = $4;
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}
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| tUNUMBER ':' tUNUMBER tSNUMBER {
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param->yyHour = $1;
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param->yyMinutes = $3;
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param->yyMeridian = MER24;
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param->yyDSTmode = DSToff;
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param->yyTimezone = - ($4 % 100 + ($4 / 100) * 60);
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}
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| tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid {
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param->yyHour = $1;
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param->yyMinutes = $3;
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param->yySeconds = $5;
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param->yyMeridian = $6;
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}
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| tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER {
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param->yyHour = $1;
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param->yyMinutes = $3;
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param->yySeconds = $5;
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param->yyMeridian = MER24;
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param->yyDSTmode = DSToff;
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param->yyTimezone = - ($6 % 100 + ($6 / 100) * 60);
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}
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| tUNUMBER ':' tUNUMBER ':' tUNUMBER '.' tUNUMBER {
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param->yyHour = $1;
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param->yyMinutes = $3;
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param->yySeconds = $5;
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param->yyMeridian = MER24;
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param->yyDSTmode = DSToff;
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/* XXX: Do nothing with millis */
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/* param->yyTimezone = ($7 % 100 + ($7 / 100) * 60); */
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}
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;
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zone : tZONE {
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param->yyTimezone = $1;
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param->yyDSTmode = DSToff;
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}
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| tDAYZONE {
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param->yyTimezone = $1;
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param->yyDSTmode = DSTon;
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}
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|
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tZONE tDST {
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param->yyTimezone = $1;
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param->yyDSTmode = DSTon;
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}
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;
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day : tDAY {
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param->yyDayOrdinal = 1;
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param->yyDayNumber = $1;
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}
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| tDAY ',' {
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param->yyDayOrdinal = 1;
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param->yyDayNumber = $1;
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}
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| tUNUMBER tDAY {
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param->yyDayOrdinal = $1;
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param->yyDayNumber = $2;
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}
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;
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date : tUNUMBER '/' tUNUMBER {
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param->yyMonth = $1;
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param->yyDay = $3;
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}
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| tUNUMBER '/' tUNUMBER '/' tUNUMBER {
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if ($1 >= 100) {
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param->yyYear = $1;
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param->yyMonth = $3;
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param->yyDay = $5;
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} else {
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param->yyMonth = $1;
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param->yyDay = $3;
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param->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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param->yyYear = $1;
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param->yyMonth = -$2;
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param->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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param->yyDay = $1;
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param->yyMonth = $2;
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param->yyYear = -$3;
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}
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| tMONTH tUNUMBER {
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param->yyMonth = $1;
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param->yyDay = $2;
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}
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| tMONTH tUNUMBER ',' tUNUMBER {
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param->yyMonth = $1;
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param->yyDay = $2;
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param->yyYear = $4;
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}
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| tUNUMBER tMONTH {
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param->yyMonth = $2;
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param->yyDay = $1;
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}
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| tUNUMBER tMONTH tUNUMBER {
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param->yyMonth = $2;
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param->yyDay = $1;
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param->yyYear = $3;
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}
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;
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rel : relunit tAGO {
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param->yyRelSeconds = -param->yyRelSeconds;
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param->yyRelMonth = -param->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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param->yyRelSeconds += $1 * $2 * 60L;
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}
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| tSNUMBER tMINUTE_UNIT {
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param->yyRelSeconds += $1 * $2 * 60L;
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}
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| tMINUTE_UNIT {
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param->yyRelSeconds += $1 * 60L;
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}
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| tSNUMBER tSEC_UNIT {
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param->yyRelSeconds += $1;
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}
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| tUNUMBER tSEC_UNIT {
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param->yyRelSeconds += $1;
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}
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| tSEC_UNIT {
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param->yyRelSeconds++;
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}
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| tSNUMBER tMONTH_UNIT {
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param->yyRelMonth += $1 * $2;
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}
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| tUNUMBER tMONTH_UNIT {
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param->yyRelMonth += $1 * $2;
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}
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| tMONTH_UNIT {
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param->yyRelMonth += $1;
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}
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;
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number : tUNUMBER {
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if (param->yyHaveTime && param->yyHaveDate && !param->yyHaveRel)
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param->yyYear = $1;
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else {
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if($1>10000) {
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param->yyHaveDate++;
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param->yyDay= ($1)%100;
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param->yyMonth= ($1/100)%100;
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param->yyYear = $1/10000;
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}
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else {
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param->yyHaveTime++;
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if ($1 < 100) {
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param->yyHour = $1;
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param->yyMinutes = 0;
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}
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else {
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param->yyHour = $1 / 100;
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param->yyMinutes = $1 % 100;
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}
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param->yySeconds = 0;
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param->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 const 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 const 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, 0, 0 }
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};
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/* Assorted relative-time words. */
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static const 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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{ "one", tUNUMBER, 1 },
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/* { "second", tUNUMBER, 2 }, */
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{ "two", tUNUMBER, 2 },
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{ "third", tUNUMBER, 3 },
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{ "three", tUNUMBER, 3 },
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{ "fourth", tUNUMBER, 4 },
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{ "four", tUNUMBER, 4 },
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{ "fifth", tUNUMBER, 5 },
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{ "five", tUNUMBER, 5 },
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{ "sixth", tUNUMBER, 6 },
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{ "six", tUNUMBER, 6 },
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{ "seventh", tUNUMBER, 7 },
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{ "seven", tUNUMBER, 7 },
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{ "eighth", tUNUMBER, 8 },
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{ "eight", tUNUMBER, 8 },
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{ "ninth", tUNUMBER, 9 },
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{ "nine", tUNUMBER, 9 },
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{ "tenth", tUNUMBER, 10 },
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{ "ten", tUNUMBER, 10 },
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{ "eleventh", tUNUMBER, 11 },
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{ "eleven", tUNUMBER, 11 },
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{ "twelfth", tUNUMBER, 12 },
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{ "twelve", tUNUMBER, 12 },
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{ "ago", tAGO, 1 },
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{ NULL, 0, 0 }
|
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};
|
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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 const 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 */
|
||
{ "ndt", tDAYZONE, HOUR(3.5) }, /* Newfoundland Daylight */
|
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#endif
|
||
{ "ast", tZONE, HOUR( 4) }, /* Atlantic Standard */
|
||
{ "adt", tDAYZONE, HOUR( 4) }, /* Atlantic Daylight */
|
||
{ "est", tZONE, HOUR( 5) }, /* Eastern Standard */
|
||
{ "edt", tDAYZONE, HOUR( 5) }, /* Eastern Daylight */
|
||
{ "cst", tZONE, HOUR( 6) }, /* Central Standard */
|
||
{ "cdt", tDAYZONE, HOUR( 6) }, /* Central Daylight */
|
||
{ "mst", tZONE, HOUR( 7) }, /* Mountain Standard */
|
||
{ "mdt", tDAYZONE, HOUR( 7) }, /* Mountain Daylight */
|
||
{ "pst", tZONE, HOUR( 8) }, /* Pacific Standard */
|
||
{ "pdt", tDAYZONE, HOUR( 8) }, /* Pacific Daylight */
|
||
{ "yst", tZONE, HOUR( 9) }, /* Yukon Standard */
|
||
{ "ydt", tDAYZONE, HOUR( 9) }, /* Yukon Daylight */
|
||
{ "hst", tZONE, HOUR(10) }, /* Hawaii Standard */
|
||
{ "hdt", tDAYZONE, HOUR(10) }, /* Hawaii Daylight */
|
||
{ "cat", tZONE, HOUR(10) }, /* Central Alaska */
|
||
{ "ahst", tZONE, HOUR(10) }, /* Alaska-Hawaii Standard */
|
||
{ "nt", tZONE, HOUR(11) }, /* Nome */
|
||
{ "idlw", tZONE, HOUR(12) }, /* International Date Line West */
|
||
{ "cet", tZONE, -HOUR(1) }, /* Central European */
|
||
{ "met", tZONE, -HOUR(1) }, /* Middle European */
|
||
{ "mewt", tZONE, -HOUR(1) }, /* Middle European Winter */
|
||
{ "mest", tDAYZONE, -HOUR(1) }, /* Middle European Summer */
|
||
{ "swt", tZONE, -HOUR(1) }, /* Swedish Winter */
|
||
{ "sst", tDAYZONE, -HOUR(1) }, /* Swedish Summer */
|
||
{ "fwt", tZONE, -HOUR(1) }, /* French Winter */
|
||
{ "fst", tDAYZONE, -HOUR(1) }, /* French Summer */
|
||
{ "eet", tZONE, -HOUR(2) }, /* Eastern Europe, USSR Zone 1 */
|
||
{ "bt", tZONE, -HOUR(3) }, /* Baghdad, USSR Zone 2 */
|
||
#if 0
|
||
{ "it", tZONE, -HOUR(3.5) },/* Iran */
|
||
#endif
|
||
{ "zp4", tZONE, -HOUR(4) }, /* USSR Zone 3 */
|
||
{ "zp5", tZONE, -HOUR(5) }, /* USSR Zone 4 */
|
||
#if 0
|
||
{ "ist", tZONE, -HOUR(5.5) },/* Indian Standard */
|
||
#endif
|
||
{ "zp6", tZONE, -HOUR(6) }, /* USSR Zone 5 */
|
||
#if 0
|
||
/* For completeness. NST is also Newfoundland Stanard, and SST is
|
||
* also Swedish Summer. */
|
||
{ "nst", tZONE, -HOUR(6.5) },/* North Sumatra */
|
||
{ "sst", tZONE, -HOUR(7) }, /* South Sumatra, USSR Zone 6 */
|
||
#endif /* 0 */
|
||
{ "wast", tZONE, -HOUR(7) }, /* West Australian Standard */
|
||
{ "wadt", tDAYZONE, -HOUR(7) }, /* West Australian Daylight */
|
||
#if 0
|
||
{ "jt", tZONE, -HOUR(7.5) },/* Java (3pm in Cronusland!) */
|
||
#endif
|
||
{ "cct", tZONE, -HOUR(8) }, /* China Coast, USSR Zone 7 */
|
||
{ "jst", tZONE, -HOUR(9) }, /* Japan Standard, USSR Zone 8 */
|
||
#if 0
|
||
{ "cast", tZONE, -HOUR(9.5) },/* Central Australian Standard */
|
||
{ "cadt", tDAYZONE, -HOUR(9.5) },/* Central Australian Daylight */
|
||
#endif
|
||
{ "east", tZONE, -HOUR(10) }, /* Eastern Australian Standard */
|
||
{ "eadt", tDAYZONE, -HOUR(10) }, /* Eastern Australian Daylight */
|
||
{ "gst", tZONE, -HOUR(10) }, /* Guam Standard, USSR Zone 9 */
|
||
{ "nzt", tZONE, -HOUR(12) }, /* New Zealand */
|
||
{ "nzst", tZONE, -HOUR(12) }, /* New Zealand Standard */
|
||
{ "nzdt", tDAYZONE, -HOUR(12) }, /* New Zealand Daylight */
|
||
{ "idle", tZONE, -HOUR(12) }, /* International Date Line East */
|
||
{ NULL, 0, 0 }
|
||
};
|
||
|
||
/* Military timezone table. */
|
||
static const TABLE const MilitaryTable[] = {
|
||
{ "a", tZONE, HOUR( 1) },
|
||
{ "b", tZONE, HOUR( 2) },
|
||
{ "c", tZONE, HOUR( 3) },
|
||
{ "d", tZONE, HOUR( 4) },
|
||
{ "e", tZONE, HOUR( 5) },
|
||
{ "f", tZONE, HOUR( 6) },
|
||
{ "g", tZONE, HOUR( 7) },
|
||
{ "h", tZONE, HOUR( 8) },
|
||
{ "i", tZONE, HOUR( 9) },
|
||
{ "k", tZONE, HOUR( 10) },
|
||
{ "l", tZONE, HOUR( 11) },
|
||
{ "m", tZONE, HOUR( 12) },
|
||
{ "n", tZONE, HOUR(- 1) },
|
||
{ "o", tZONE, HOUR(- 2) },
|
||
{ "p", tZONE, HOUR(- 3) },
|
||
{ "q", tZONE, HOUR(- 4) },
|
||
{ "r", tZONE, HOUR(- 5) },
|
||
{ "s", tZONE, HOUR(- 6) },
|
||
{ "t", tZONE, HOUR(- 7) },
|
||
{ "u", tZONE, HOUR(- 8) },
|
||
{ "v", tZONE, HOUR(- 9) },
|
||
{ "w", tZONE, HOUR(-10) },
|
||
{ "x", tZONE, HOUR(-11) },
|
||
{ "y", tZONE, HOUR(-12) },
|
||
{ "z", tZONE, HOUR( 0) },
|
||
{ NULL, 0, 0 }
|
||
};
|
||
|
||
|
||
|
||
|
||
/* ARGSUSED */
|
||
static int
|
||
yyerror(struct dateinfo *param, const char **inp, const char *s __unused)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* 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, /* month of year [1-12] */
|
||
time_t Day, /* day of month [1-31] */
|
||
time_t Year, /* year; see above comment */
|
||
time_t Hours, /* Hour of day [0-24] */
|
||
time_t Minutes, /* Minute of hour [0-59] */
|
||
time_t Seconds, /* Second of minute [0-60] */
|
||
time_t Timezone, /* Timezone as seconds west of UTC */
|
||
MERIDIAN Meridian, /* Hours are am/pm/24 hour clock */
|
||
DSTMODE DSTmode /* DST on/off/maybe */
|
||
)
|
||
{
|
||
struct tm tm;
|
||
|
||
/* XXX Y2K */
|
||
if (Year < 0)
|
||
Year = -Year;
|
||
if (Year < 70)
|
||
Year += 2000;
|
||
else if (Year < 100)
|
||
Year += 1900;
|
||
|
||
tm.tm_sec = Seconds;
|
||
tm.tm_min = Minutes;
|
||
tm.tm_hour = Hours + (Meridian == MERpm ? 12 : 0);
|
||
tm.tm_mday = Day;
|
||
tm.tm_mon = Month - 1;
|
||
tm.tm_year = Year - 1900;
|
||
switch (DSTmode) {
|
||
case DSTon: tm.tm_isdst = 1; break;
|
||
case DSToff: tm.tm_isdst = 0; break;
|
||
default: tm.tm_isdst = -1; break;
|
||
}
|
||
tm.tm_gmtoff = -Timezone;
|
||
|
||
return mktime(&tm);
|
||
}
|
||
|
||
|
||
static time_t
|
||
DSTcorrect(
|
||
time_t Start,
|
||
time_t Future
|
||
)
|
||
{
|
||
time_t StartDay;
|
||
time_t FutureDay;
|
||
struct tm *tm;
|
||
|
||
if ((tm = localtime(&Start)) == NULL)
|
||
return -1;
|
||
StartDay = (tm->tm_hour + 1) % 24;
|
||
|
||
if ((tm = localtime(&Future)) == NULL)
|
||
return -1;
|
||
FutureDay = (tm->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,
|
||
time_t Timezone
|
||
)
|
||
{
|
||
struct tm *tm;
|
||
time_t Month;
|
||
time_t Year;
|
||
|
||
if (RelMonth == 0)
|
||
return 0;
|
||
tm = localtime(&Start);
|
||
if (tm == NULL)
|
||
return -1;
|
||
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,
|
||
Timezone, MER24, DSTmaybe));
|
||
}
|
||
|
||
|
||
static int
|
||
LookupWord(YYSTYPE *yylval, char *buff)
|
||
{
|
||
register char *p;
|
||
register char *q;
|
||
register const TABLE *tp;
|
||
int i;
|
||
int abbrev;
|
||
|
||
/* Make it lowercase. */
|
||
for (p = buff; *p; p++)
|
||
if (isupper((unsigned char)*p))
|
||
*p = tolower((unsigned char)*p);
|
||
|
||
if (strcmp(buff, "am") == 0 || strcmp(buff, "a.m.") == 0) {
|
||
yylval->Meridian = MERam;
|
||
return tMERIDIAN;
|
||
}
|
||
if (strcmp(buff, "pm") == 0 || strcmp(buff, "p.m.") == 0) {
|
||
yylval->Meridian = MERpm;
|
||
return tMERIDIAN;
|
||
}
|
||
|
||
/* See if we have an abbreviation for a month. */
|
||
if (strlen(buff) == 3)
|
||
abbrev = 1;
|
||
else if (strlen(buff) == 4 && buff[3] == '.') {
|
||
abbrev = 1;
|
||
buff[3] = '\0';
|
||
}
|
||
else
|
||
abbrev = 0;
|
||
|
||
for (tp = MonthDayTable; tp->name; tp++) {
|
||
if (abbrev) {
|
||
if (strncmp(buff, tp->name, 3) == 0) {
|
||
yylval->Number = tp->value;
|
||
return tp->type;
|
||
}
|
||
}
|
||
else if (strcmp(buff, tp->name) == 0) {
|
||
yylval->Number = tp->value;
|
||
return tp->type;
|
||
}
|
||
}
|
||
|
||
for (tp = TimezoneTable; tp->name; tp++)
|
||
if (strcmp(buff, tp->name) == 0) {
|
||
yylval->Number = tp->value;
|
||
return tp->type;
|
||
}
|
||
|
||
if (strcmp(buff, "dst") == 0)
|
||
return tDST;
|
||
|
||
for (tp = UnitsTable; tp->name; tp++)
|
||
if (strcmp(buff, tp->name) == 0) {
|
||
yylval->Number = tp->value;
|
||
return tp->type;
|
||
}
|
||
|
||
/* Strip off any plural and try the units table again. */
|
||
i = strlen(buff) - 1;
|
||
if (buff[i] == 's') {
|
||
buff[i] = '\0';
|
||
for (tp = UnitsTable; tp->name; tp++)
|
||
if (strcmp(buff, tp->name) == 0) {
|
||
yylval->Number = tp->value;
|
||
return tp->type;
|
||
}
|
||
buff[i] = 's'; /* Put back for "this" in OtherTable. */
|
||
}
|
||
|
||
for (tp = OtherTable; tp->name; tp++)
|
||
if (strcmp(buff, tp->name) == 0) {
|
||
yylval->Number = tp->value;
|
||
return tp->type;
|
||
}
|
||
|
||
/* Military timezones. */
|
||
if (buff[1] == '\0' && isalpha((unsigned char)*buff)) {
|
||
for (tp = MilitaryTable; tp->name; tp++)
|
||
if (strcmp(buff, tp->name) == 0) {
|
||
yylval->Number = tp->value;
|
||
return tp->type;
|
||
}
|
||
}
|
||
|
||
/* Drop out any periods and try the timezone table again. */
|
||
for (i = 0, p = q = 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(YYSTYPE *yylval, const char **yyInput)
|
||
{
|
||
register char c;
|
||
register char *p;
|
||
char buff[20];
|
||
int Count;
|
||
int sign;
|
||
const char *inp = *yyInput;
|
||
|
||
for ( ; ; ) {
|
||
while (isspace((unsigned char)*inp))
|
||
inp++;
|
||
|
||
if (isdigit((unsigned char)(c = *inp)) || c == '-' || c == '+') {
|
||
if (c == '-' || c == '+') {
|
||
sign = c == '-' ? -1 : 1;
|
||
if (!isdigit((unsigned char)*++inp))
|
||
/* skip the '-' sign */
|
||
continue;
|
||
}
|
||
else
|
||
sign = 0;
|
||
for (yylval->Number = 0; isdigit((unsigned char)(c = *inp++)); )
|
||
yylval->Number = 10 * yylval->Number + c - '0';
|
||
if (sign < 0)
|
||
yylval->Number = -yylval->Number;
|
||
*yyInput = --inp;
|
||
return sign ? tSNUMBER : tUNUMBER;
|
||
}
|
||
if (isalpha((unsigned char)c)) {
|
||
for (p = buff; isalpha((unsigned char)(c = *inp++)) || c == '.'; )
|
||
if (p < &buff[sizeof buff - 1])
|
||
*p++ = c;
|
||
*p = '\0';
|
||
*yyInput = --inp;
|
||
return LookupWord(yylval, buff);
|
||
}
|
||
if (c == '@') {
|
||
*yyInput = ++inp;
|
||
return AT_SIGN;
|
||
}
|
||
if (c != '(') {
|
||
*yyInput = ++inp;
|
||
return c;
|
||
}
|
||
Count = 0;
|
||
do {
|
||
c = *inp++;
|
||
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 time_t
|
||
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 ((time_t)60*(60*(24*days + (a->tm_hour - b->tm_hour))
|
||
+ (a->tm_min - b->tm_min))
|
||
+ (a->tm_sec - b->tm_sec));
|
||
}
|
||
|
||
time_t
|
||
parsedate(const char *p, const time_t *now, const int *zone)
|
||
{
|
||
struct tm gmt, local, *gmt_ptr, *tm;
|
||
time_t nowt;
|
||
int zonet;
|
||
time_t Start;
|
||
time_t tod, rm;
|
||
struct dateinfo param;
|
||
|
||
if (now == NULL || zone == NULL) {
|
||
now = &nowt;
|
||
zone = &zonet;
|
||
(void)time(&nowt);
|
||
|
||
gmt_ptr = gmtime_r(now, &gmt);
|
||
if ((tm = localtime_r(now, &local)) == NULL)
|
||
return -1;
|
||
|
||
if (gmt_ptr != NULL)
|
||
zonet = difftm(&gmt, &local) / 60;
|
||
else
|
||
/* We are on a system like VMS, where the system clock is
|
||
in local time and the system has no concept of timezones.
|
||
Hopefully we can fake this out (for the case in which the
|
||
user specifies no timezone) by just saying the timezone
|
||
is zero. */
|
||
zonet = 0;
|
||
|
||
if (local.tm_isdst)
|
||
zonet += 60;
|
||
} else {
|
||
if ((tm = localtime_r(now, &local)) == NULL)
|
||
return -1;
|
||
}
|
||
param.yyYear = tm->tm_year + 1900;
|
||
param.yyMonth = tm->tm_mon + 1;
|
||
param.yyDay = tm->tm_mday;
|
||
param.yyTimezone = *zone;
|
||
param.yyDSTmode = DSTmaybe;
|
||
param.yyHour = 0;
|
||
param.yyMinutes = 0;
|
||
param.yySeconds = 0;
|
||
param.yyMeridian = MER24;
|
||
param.yyRelSeconds = 0;
|
||
param.yyRelMonth = 0;
|
||
param.yyHaveDate = 0;
|
||
param.yyHaveDay = 0;
|
||
param.yyHaveRel = 0;
|
||
param.yyHaveTime = 0;
|
||
param.yyHaveZone = 0;
|
||
|
||
if (yyparse(¶m, &p) || param.yyHaveTime > 1 || param.yyHaveZone > 1 ||
|
||
param.yyHaveDate > 1 || param.yyHaveDay > 1)
|
||
return -1;
|
||
|
||
if (param.yyHaveDate || param.yyHaveTime || param.yyHaveDay) {
|
||
Start = Convert(param.yyMonth, param.yyDay, param.yyYear, param.yyHour,
|
||
param.yyMinutes, param.yySeconds, param.yyTimezone,
|
||
param.yyMeridian, param.yyDSTmode);
|
||
if (Start == -1)
|
||
return -1;
|
||
}
|
||
else {
|
||
Start = *now;
|
||
if (!param.yyHaveRel)
|
||
Start -= ((tm->tm_hour * 60L + tm->tm_min) * 60L) + tm->tm_sec;
|
||
}
|
||
|
||
Start += param.yyRelSeconds;
|
||
rm = RelativeMonth(Start, param.yyRelMonth, param.yyTimezone);
|
||
if (rm == -1)
|
||
return -1;
|
||
Start += rm;
|
||
|
||
if (param.yyHaveDay && !param.yyHaveDate) {
|
||
tod = RelativeDate(Start, param.yyDayOrdinal, param.yyDayNumber);
|
||
Start += tod;
|
||
}
|
||
|
||
return Start;
|
||
}
|
||
|
||
|
||
#if defined(TEST)
|
||
|
||
/* ARGSUSED */
|
||
int
|
||
main(ac, av)
|
||
int ac;
|
||
char *av[];
|
||
{
|
||
char buff[128];
|
||
time_t d;
|
||
|
||
(void)printf("Enter date, or blank line to exit.\n\t> ");
|
||
(void)fflush(stdout);
|
||
while (gets(buff) && buff[0]) {
|
||
d = parsedate(buff, NULL, 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) */
|