%{ /* ** Originally written by Steven M. Bellovin while ** at the University of North Carolina at Chapel Hill. Later tweaked by ** a couple of people on Usenet. Completely overhauled by Rich $alz ** and Jim Berets in August, 1990; ** send any email to Rich. ** ** This grammar has 10 shift/reduce conflicts. ** ** This code is in the public domain and has no copyright. */ /* SUPPRESS 287 on yaccpar_sccsid *//* Unused static variable */ /* SUPPRESS 288 on yyerrlab *//* Label unused */ #ifdef HAVE_CONFIG_H #include #ifdef FORCE_ALLOCA_H #include #endif #endif /* Since the code of getdate.y is not included in the Emacs executable itself, there is no need to #define static in this file. Even if the code were included in the Emacs executable, it probably wouldn't do any harm to #undef it here; this will only cause problems if we try to write to a static variable, which I don't think this code needs to do. */ #ifdef emacs #undef static #endif #include #include #if defined (STDC_HEADERS) || !defined (isascii) # define ISASCII(c) 1 #else # define ISASCII(c) isascii(c) #endif #define ISSPACE(c) (ISASCII (c) && isspace (c)) #define ISALPHA(c) (ISASCII (c) && isalpha (c)) #define ISUPPER(c) (ISASCII (c) && isupper (c)) #define ISDIGIT(c) (ISASCII (c) && isdigit (c)) #if defined (vms) #include #include #else #include #ifdef TIME_WITH_SYS_TIME #include #include #else #ifdef HAVE_SYS_TIME_H #include #else #include #endif #endif #ifdef timezone #undef timezone /* needed for sgi */ #endif #if defined (HAVE_SYS_TIMEB_H) #include #else /* get_date uses the obsolete `struct timeb' in its interface! FIXME. Since some systems don't have it, we define it here; callers must do likewise. */ struct timeb { time_t time; /* Seconds since the epoch */ unsigned short millitm; /* Field not used */ short timezone; /* Minutes west of GMT */ short dstflag; /* Field not used */ }; #endif /* defined (HAVE_SYS_TIMEB_H) */ #endif /* defined (vms) */ #if defined (STDC_HEADERS) || defined (USG) #include #endif /* Some old versions of bison generate parsers that use bcopy. That loses on systems that don't provide the function, so we have to redefine it here. */ #if !defined (HAVE_BCOPY) && defined (HAVE_MEMCPY) && !defined (bcopy) #define bcopy(from, to, len) memcpy ((to), (from), (len)) #endif extern struct tm *gmtime (); extern struct tm *localtime (); /* Remap normal yacc parser interface names (yyparse, yylex, yyerror, etc), as well as gratuitiously global symbol names, so we can have multiple yacc generated parsers in the same program. Note that these are only the variables produced by yacc. If other parser generators (bison, byacc, etc) produce additional global names that conflict at link time, then those parser generators need to be fixed instead of adding those names to this list. */ #define yymaxdepth gd_maxdepth #define yyparse gd_parse #define yylex gd_lex #define yyerror gd_error #define yylval gd_lval #define yychar gd_char #define yydebug gd_debug #define yypact gd_pact #define yyr1 gd_r1 #define yyr2 gd_r2 #define yydef gd_def #define yychk gd_chk #define yypgo gd_pgo #define yyact gd_act #define yyexca gd_exca #define yyerrflag gd_errflag #define yynerrs gd_nerrs #define yyps gd_ps #define yypv gd_pv #define yys gd_s #define yy_yys gd_yys #define yystate gd_state #define yytmp gd_tmp #define yyv gd_v #define yy_yyv gd_yyv #define yyval gd_val #define yylloc gd_lloc #define yyreds gd_reds /* With YYDEBUG defined */ #define yytoks gd_toks /* With YYDEBUG defined */ #define yylhs gd_yylhs #define yylen gd_yylen #define yydefred gd_yydefred #define yydgoto gd_yydgoto #define yysindex gd_yysindex #define yyrindex gd_yyrindex #define yygindex gd_yygindex #define yytable gd_yytable #define yycheck gd_yycheck static int yylex (); static int yyerror (); #define EPOCH 1970 #define DOOMSDAY 2038 #define HOUR(x) ((time_t)(x) * 60) #define SECSPERDAY (24L * 60L * 60L) #define MAX_BUFF_LEN 128 /* size of buffer to read the date into */ /* ** An entry in the lexical lookup table. */ typedef struct _TABLE { const char *name; int type; time_t value; } TABLE; /* ** Daylight-savings mode: on, off, or not yet known. */ typedef enum _DSTMODE { DSTon, DSToff, DSTmaybe } DSTMODE; /* ** Meridian: am, pm, or 24-hour style. */ typedef enum _MERIDIAN { MERam, MERpm, MER24 } MERIDIAN; /* ** Global variables. We could get rid of most of these by using a good ** union as the yacc stack. (This routine was originally written before ** yacc had the %union construct.) Maybe someday; right now we only use ** the %union very rarely. */ static char *yyInput; static DSTMODE yyDSTmode; static time_t yyDayOrdinal; static time_t yyDayNumber; static int yyHaveDate; static int yyHaveDay; static int yyHaveRel; static int yyHaveTime; static int yyHaveZone; static time_t yyTimezone; static time_t yyDay; static time_t yyHour; static time_t yyMinutes; static time_t yyMonth; static time_t yySeconds; static time_t yyYear; static MERIDIAN yyMeridian; static time_t yyRelMonth; static time_t yyRelSeconds; %} %union { time_t Number; enum _MERIDIAN Meridian; } %token tAGO tDAY tDAYZONE tID tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT %token tSEC_UNIT tSNUMBER tUNUMBER tZONE tDST %type tDAY tDAYZONE tMINUTE_UNIT tMONTH tMONTH_UNIT %type tSEC_UNIT tSNUMBER tUNUMBER tZONE %type tMERIDIAN o_merid %% spec : /* NULL */ | spec item ; item : time { yyHaveTime++; } | zone { yyHaveZone++; } | date { yyHaveDate++; } | day { yyHaveDay++; } | rel { yyHaveRel++; } | number ; time : tUNUMBER tMERIDIAN { yyHour = $1; yyMinutes = 0; yySeconds = 0; yyMeridian = $2; } | tUNUMBER ':' tUNUMBER o_merid { yyHour = $1; yyMinutes = $3; yySeconds = 0; yyMeridian = $4; } | tUNUMBER ':' tUNUMBER tSNUMBER { yyHour = $1; yyMinutes = $3; yyMeridian = MER24; yyDSTmode = DSToff; yyTimezone = - ($4 % 100 + ($4 / 100) * 60); } | tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid { yyHour = $1; yyMinutes = $3; yySeconds = $5; yyMeridian = $6; } | tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER { yyHour = $1; yyMinutes = $3; yySeconds = $5; yyMeridian = MER24; yyDSTmode = DSToff; yyTimezone = - ($6 % 100 + ($6 / 100) * 60); } ; zone : tZONE { yyTimezone = $1; yyDSTmode = DSToff; } | tDAYZONE { yyTimezone = $1; yyDSTmode = DSTon; } | tZONE tDST { yyTimezone = $1; yyDSTmode = DSTon; } ; day : tDAY { yyDayOrdinal = 1; yyDayNumber = $1; } | tDAY ',' { yyDayOrdinal = 1; yyDayNumber = $1; } | tUNUMBER tDAY { yyDayOrdinal = $1; yyDayNumber = $2; } ; date : tUNUMBER '/' tUNUMBER { yyMonth = $1; yyDay = $3; } | tUNUMBER '/' tUNUMBER '/' tUNUMBER { yyMonth = $1; yyDay = $3; yyYear = $5; } | tUNUMBER tSNUMBER tSNUMBER { /* ISO 8601 format. yyyy-mm-dd. */ yyYear = $1; yyMonth = -$2; yyDay = -$3; } | tUNUMBER tMONTH tSNUMBER { /* e.g. 17-JUN-1992. */ yyDay = $1; yyMonth = $2; yyYear = -$3; } | tMONTH tUNUMBER { yyMonth = $1; yyDay = $2; } | tMONTH tUNUMBER ',' tUNUMBER { yyMonth = $1; yyDay = $2; yyYear = $4; } | tUNUMBER tMONTH { yyMonth = $2; yyDay = $1; } | tUNUMBER tMONTH tUNUMBER { yyMonth = $2; yyDay = $1; yyYear = $3; } ; rel : relunit tAGO { yyRelSeconds = -yyRelSeconds; yyRelMonth = -yyRelMonth; } | relunit ; relunit : tUNUMBER tMINUTE_UNIT { yyRelSeconds += $1 * $2 * 60L; } | tSNUMBER tMINUTE_UNIT { yyRelSeconds += $1 * $2 * 60L; } | tMINUTE_UNIT { yyRelSeconds += $1 * 60L; } | tSNUMBER tSEC_UNIT { yyRelSeconds += $1; } | tUNUMBER tSEC_UNIT { yyRelSeconds += $1; } | tSEC_UNIT { yyRelSeconds++; } | tSNUMBER tMONTH_UNIT { yyRelMonth += $1 * $2; } | tUNUMBER tMONTH_UNIT { yyRelMonth += $1 * $2; } | tMONTH_UNIT { yyRelMonth += $1; } ; number : tUNUMBER { if (yyHaveTime && yyHaveDate && !yyHaveRel) yyYear = $1; else { if ($1>10000) { yyHaveDate++; yyDay= ($1)%100; yyMonth= ($1/100)%100; yyYear = $1/10000; } else { yyHaveTime++; if ($1 < 100) { yyHour = $1; yyMinutes = 0; } else { yyHour = $1 / 100; yyMinutes = $1 % 100; } yySeconds = 0; yyMeridian = MER24; } } } ; o_merid : /* NULL */ { $$ = MER24; } | tMERIDIAN { $$ = $1; } ; %% /* Month and day table. */ static TABLE const MonthDayTable[] = { { "january", tMONTH, 1 }, { "february", tMONTH, 2 }, { "march", tMONTH, 3 }, { "april", tMONTH, 4 }, { "may", tMONTH, 5 }, { "june", tMONTH, 6 }, { "july", tMONTH, 7 }, { "august", tMONTH, 8 }, { "september", tMONTH, 9 }, { "sept", tMONTH, 9 }, { "october", tMONTH, 10 }, { "november", tMONTH, 11 }, { "december", tMONTH, 12 }, { "sunday", tDAY, 0 }, { "monday", tDAY, 1 }, { "tuesday", tDAY, 2 }, { "tues", tDAY, 2 }, { "wednesday", tDAY, 3 }, { "wednes", tDAY, 3 }, { "thursday", tDAY, 4 }, { "thur", tDAY, 4 }, { "thurs", tDAY, 4 }, { "friday", tDAY, 5 }, { "saturday", tDAY, 6 }, { NULL } }; /* Time units table. */ static TABLE const UnitsTable[] = { { "year", tMONTH_UNIT, 12 }, { "month", tMONTH_UNIT, 1 }, { "fortnight", tMINUTE_UNIT, 14 * 24 * 60 }, { "week", tMINUTE_UNIT, 7 * 24 * 60 }, { "day", tMINUTE_UNIT, 1 * 24 * 60 }, { "hour", tMINUTE_UNIT, 60 }, { "minute", tMINUTE_UNIT, 1 }, { "min", tMINUTE_UNIT, 1 }, { "second", tSEC_UNIT, 1 }, { "sec", tSEC_UNIT, 1 }, { NULL } }; /* Assorted relative-time words. */ static TABLE const OtherTable[] = { { "tomorrow", tMINUTE_UNIT, 1 * 24 * 60 }, { "yesterday", tMINUTE_UNIT, -1 * 24 * 60 }, { "today", tMINUTE_UNIT, 0 }, { "now", tMINUTE_UNIT, 0 }, { "last", tUNUMBER, -1 }, { "this", tMINUTE_UNIT, 0 }, { "next", tUNUMBER, 2 }, { "first", tUNUMBER, 1 }, /* { "second", tUNUMBER, 2 }, */ { "third", tUNUMBER, 3 }, { "fourth", tUNUMBER, 4 }, { "fifth", tUNUMBER, 5 }, { "sixth", tUNUMBER, 6 }, { "seventh", tUNUMBER, 7 }, { "eighth", tUNUMBER, 8 }, { "ninth", tUNUMBER, 9 }, { "tenth", tUNUMBER, 10 }, { "eleventh", tUNUMBER, 11 }, { "twelfth", tUNUMBER, 12 }, { "ago", tAGO, 1 }, { NULL } }; /* The timezone table. */ /* Some of these are commented out because a time_t can't store a float. */ static TABLE const TimezoneTable[] = { { "gmt", tZONE, HOUR ( 0) }, /* Greenwich Mean */ { "ut", tZONE, HOUR ( 0) }, /* Universal (Coordinated) */ { "utc", tZONE, HOUR ( 0) }, { "wet", tZONE, HOUR ( 0) }, /* Western European */ { "bst", tDAYZONE, HOUR ( 0) }, /* British Summer */ { "wat", tZONE, HOUR ( 1) }, /* West Africa */ { "at", tZONE, HOUR ( 2) }, /* Azores */ #if 0 /* For completeness. BST is also British Summer, and GST is * also Guam Standard. */ { "bst", tZONE, HOUR ( 3) }, /* Brazil Standard */ { "gst", tZONE, HOUR ( 3) }, /* Greenland Standard */ #endif #if 0 { "nft", tZONE, HOUR (3.5) }, /* Newfoundland */ { "nst", tZONE, HOUR (3.5) }, /* Newfoundland Standard */ { "ndt", tDAYZONE, HOUR (3.5) }, /* Newfoundland Daylight */ #endif { "ast", tZONE, HOUR ( 4) }, /* Atlantic Standard */ { "adt", tDAYZONE, HOUR ( 4) }, /* Atlantic Daylight */ { "est", tZONE, HOUR ( 5) }, /* Eastern Standard */ { "edt", tDAYZONE, HOUR ( 5) }, /* Eastern Daylight */ { "cst", tZONE, HOUR ( 6) }, /* Central Standard */ { "cdt", tDAYZONE, HOUR ( 6) }, /* Central Daylight */ { "mst", tZONE, HOUR ( 7) }, /* Mountain Standard */ { "mdt", tDAYZONE, HOUR ( 7) }, /* Mountain Daylight */ { "pst", tZONE, HOUR ( 8) }, /* Pacific Standard */ { "pdt", tDAYZONE, HOUR ( 8) }, /* Pacific Daylight */ { "yst", tZONE, HOUR ( 9) }, /* Yukon Standard */ { "ydt", tDAYZONE, HOUR ( 9) }, /* Yukon Daylight */ { "hst", tZONE, HOUR (10) }, /* Hawaii Standard */ { "hdt", tDAYZONE, HOUR (10) }, /* Hawaii Daylight */ { "cat", tZONE, HOUR (10) }, /* Central Alaska */ { "ahst", tZONE, HOUR (10) }, /* Alaska-Hawaii Standard */ { "nt", tZONE, HOUR (11) }, /* Nome */ { "idlw", tZONE, HOUR (12) }, /* International Date Line West */ { "cet", tZONE, -HOUR (1) }, /* Central European */ { "met", tZONE, -HOUR (1) }, /* Middle European */ { "mewt", tZONE, -HOUR (1) }, /* Middle European Winter */ { "mest", tDAYZONE, -HOUR (1) }, /* Middle European Summer */ { "mesz", tDAYZONE, -HOUR (1) }, /* Middle European Summer */ { "swt", tZONE, -HOUR (1) }, /* Swedish Winter */ { "sst", tDAYZONE, -HOUR (1) }, /* Swedish Summer */ { "fwt", tZONE, -HOUR (1) }, /* French Winter */ { "fst", tDAYZONE, -HOUR (1) }, /* French Summer */ { "eet", tZONE, -HOUR (2) }, /* Eastern Europe, USSR Zone 1 */ { "bt", tZONE, -HOUR (3) }, /* Baghdad, USSR Zone 2 */ #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 Standard, 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 } }; /* Military timezone table. */ static TABLE const MilitaryTable[] = { { "a", tZONE, HOUR ( 1) }, { "b", tZONE, HOUR ( 2) }, { "c", tZONE, HOUR ( 3) }, { "d", tZONE, HOUR ( 4) }, { "e", tZONE, HOUR ( 5) }, { "f", tZONE, HOUR ( 6) }, { "g", tZONE, HOUR ( 7) }, { "h", tZONE, HOUR ( 8) }, { "i", tZONE, HOUR ( 9) }, { "k", tZONE, HOUR ( 10) }, { "l", tZONE, HOUR ( 11) }, { "m", tZONE, HOUR ( 12) }, { "n", tZONE, HOUR (- 1) }, { "o", tZONE, HOUR (- 2) }, { "p", tZONE, HOUR (- 3) }, { "q", tZONE, HOUR (- 4) }, { "r", tZONE, HOUR (- 5) }, { "s", tZONE, HOUR (- 6) }, { "t", tZONE, HOUR (- 7) }, { "u", tZONE, HOUR (- 8) }, { "v", tZONE, HOUR (- 9) }, { "w", tZONE, HOUR (-10) }, { "x", tZONE, HOUR (-11) }, { "y", tZONE, HOUR (-12) }, { "z", tZONE, HOUR ( 0) }, { NULL } }; /* ARGSUSED */ static int yyerror (s) char *s; { return 0; } static time_t ToSeconds (Hours, Minutes, Seconds, Meridian) time_t Hours; time_t Minutes; time_t Seconds; MERIDIAN Meridian; { if (Minutes < 0 || Minutes > 59 || Seconds < 0 || Seconds > 59) return -1; switch (Meridian) { case MER24: if (Hours < 0 || Hours > 23) return -1; return (Hours * 60L + Minutes) * 60L + Seconds; case MERam: if (Hours < 1 || Hours > 12) return -1; if (Hours == 12) Hours = 0; return (Hours * 60L + Minutes) * 60L + Seconds; case MERpm: if (Hours < 1 || Hours > 12) return -1; if (Hours == 12) Hours = 0; return ((Hours + 12) * 60L + Minutes) * 60L + Seconds; default: abort (); } /* NOTREACHED */ } static time_t Convert (Month, Day, Year, Hours, Minutes, Seconds, Meridian, DSTmode) 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 < DOOMSDAY-2000) Year += 2000; else if (Year < 100) Year += 1900; DaysInMonth[1] = Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0) ? 29 : 28; if (Year < EPOCH || Year >= DOOMSDAY || Month < 1 || Month > 12 /* Lint fluff: "conversion from long may lose accuracy" */ || Day < 1 || Day > DaysInMonth[(int)--Month]) return -1; for (Julian = Day - 1, i = 0; i < Month; i++) Julian += DaysInMonth[i]; for (i = EPOCH; i < Year; i++) Julian += 365 + (i % 4 == 0); Julian *= SECSPERDAY; Julian += yyTimezone * 60L; if ((tod = ToSeconds (Hours, Minutes, Seconds, Meridian)) < 0) return -1; Julian += tod; if (DSTmode == DSTon || (DSTmode == DSTmaybe && localtime (&Julian)->tm_isdst)) Julian -= 60 * 60; return Julian; } static time_t DSTcorrect (Start, Future) 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 (Start, DayOrdinal, DayNumber) 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 (Start, RelMonth) 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 * (1900 + tm->tm_year) + tm->tm_mon + RelMonth; Year = Month / 12; Month = Month % 12 + 1; return DSTcorrect (Start, Convert (Month, (time_t)tm->tm_mday, Year, (time_t)tm->tm_hour, (time_t)tm->tm_min, (time_t)tm->tm_sec, MER24, DSTmaybe)); } static int LookupWord (buff) 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 (*p)) *p = tolower (*p); if (strcmp (buff, "am") == 0 || strcmp (buff, "a.m.") == 0) { yylval.Meridian = MERam; return tMERIDIAN; } if (strcmp (buff, "pm") == 0 || strcmp (buff, "p.m.") == 0) { yylval.Meridian = MERpm; return tMERIDIAN; } /* See if we have an abbreviation for a month. */ if (strlen (buff) == 3) abbrev = 1; else if (strlen (buff) == 4 && buff[3] == '.') { abbrev = 1; buff[3] = '\0'; } else abbrev = 0; for (tp = MonthDayTable; tp->name; tp++) { if (abbrev) { if (strncmp (buff, tp->name, 3) == 0) { yylval.Number = tp->value; return tp->type; } } else if (strcmp (buff, tp->name) == 0) { yylval.Number = tp->value; return tp->type; } } for (tp = TimezoneTable; tp->name; tp++) if (strcmp (buff, tp->name) == 0) { yylval.Number = tp->value; return tp->type; } if (strcmp (buff, "dst") == 0) return tDST; for (tp = UnitsTable; tp->name; tp++) if (strcmp (buff, tp->name) == 0) { yylval.Number = tp->value; return tp->type; } /* Strip off any plural and try the units table again. */ i = strlen (buff) - 1; if (buff[i] == 's') { buff[i] = '\0'; for (tp = UnitsTable; tp->name; tp++) if (strcmp (buff, tp->name) == 0) { yylval.Number = tp->value; return tp->type; } buff[i] = 's'; /* Put back for "this" in OtherTable. */ } for (tp = OtherTable; tp->name; tp++) if (strcmp (buff, tp->name) == 0) { yylval.Number = tp->value; return tp->type; } /* Military timezones. */ if (buff[1] == '\0' && ISALPHA (*buff)) { for (tp = MilitaryTable; tp->name; tp++) if (strcmp (buff, tp->name) == 0) { yylval.Number = tp->value; return tp->type; } } /* Drop out any periods and try the timezone table again. */ for (i = 0, p = q = buff; *q; q++) if (*q != '.') *p++ = *q; else i++; *p = '\0'; if (i) for (tp = TimezoneTable; tp->name; tp++) if (strcmp (buff, tp->name) == 0) { yylval.Number = tp->value; return tp->type; } return tID; } static int yylex () { register char c; register char *p; char buff[20]; int Count; int sign; for ( ; ; ) { while (ISSPACE (*yyInput)) yyInput++; if (ISDIGIT (c = *yyInput) || c == '-' || c == '+') { if (c == '-' || c == '+') { sign = c == '-' ? -1 : 1; if (!ISDIGIT (*++yyInput)) /* skip the '-' sign */ continue; } else sign = 0; for (yylval.Number = 0; ISDIGIT (c = *yyInput++); ) yylval.Number = 10 * yylval.Number + c - '0'; yyInput--; if (sign < 0) yylval.Number = -yylval.Number; return sign ? tSNUMBER : tUNUMBER; } if (ISALPHA (c)) { for (p = buff; ISALPHA (c = *yyInput++) || c == '.'; ) if (p < &buff[sizeof buff - 1]) *p++ = c; *p = '\0'; yyInput--; return LookupWord (buff); } if (c != '(') return *yyInput++; Count = 0; do { c = *yyInput++; if (c == '\0') return c; if (c == '(') Count++; else if (c == ')') Count--; } while (Count > 0); } } #define TM_YEAR_ORIGIN 1900 /* Yield A - B, measured in seconds. */ static long difftm (a, b) struct tm *a, *b; { int ay = a->tm_year + (TM_YEAR_ORIGIN - 1); int by = b->tm_year + (TM_YEAR_ORIGIN - 1); long days = ( /* difference in day of year */ a->tm_yday - b->tm_yday /* + intervening leap days */ + ((ay >> 2) - (by >> 2)) - (ay/100 - by/100) + ((ay/100 >> 2) - (by/100 >> 2)) /* + difference in years * 365 */ + (long)(ay-by) * 365 ); return (60*(60*(24*days + (a->tm_hour - b->tm_hour)) + (a->tm_min - b->tm_min)) + (a->tm_sec - b->tm_sec)); } time_t get_date (p, now) char *p; struct timeb *now; { struct tm *tm, gmt; struct timeb ftz; time_t Start; time_t tod; yyInput = p; if (now == NULL) { now = &ftz; (void)time (&ftz.time); if (! (tm = gmtime (&ftz.time))) return -1; gmt = *tm; /* Make a copy, in case localtime modifies *tm. */ if (! (tm = localtime (&ftz.time))) return -1; ftz.timezone = difftm (&gmt, tm) / 60; if (tm->tm_isdst) ftz.timezone += 60; } tm = localtime (&now->time); yyYear = tm->tm_year; yyMonth = tm->tm_mon + 1; yyDay = tm->tm_mday; yyTimezone = now->timezone; 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 = now->time; 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 (ac, av) int ac; char *av[]; { char buff[MAX_BUFF_LEN + 1]; time_t d; (void)printf ("Enter date, or blank line to exit.\n\t> "); (void)fflush (stdout); buff[MAX_BUFF_LEN] = 0; while (fgets (buff, MAX_BUFF_LEN, stdin) && buff[0]) { d = get_date (buff, (struct timeb *)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) */