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Diffstat (limited to 'Utilities/cmlibarchive/tar/getdate.c')
-rw-r--r-- | Utilities/cmlibarchive/tar/getdate.c | 1037 |
1 files changed, 0 insertions, 1037 deletions
diff --git a/Utilities/cmlibarchive/tar/getdate.c b/Utilities/cmlibarchive/tar/getdate.c deleted file mode 100644 index aa4ccbb..0000000 --- a/Utilities/cmlibarchive/tar/getdate.c +++ /dev/null @@ -1,1037 +0,0 @@ -/* - * This code is in the public domain and has no copyright. - * - * This is a plain C recursive-descent translation of an old - * public-domain YACC grammar that has been used for parsing dates in - * very many open-source projects. - * - * Since the original authors were generous enough to donate their - * work to the public domain, I feel compelled to match their - * generosity. - * - * Tim Kientzle, February 2009. - */ - -/* - * Header comment from original getdate.y: - */ - -/* -** Originally written by Steven M. Bellovin <smb@research.att.com> while -** at the University of North Carolina at Chapel Hill. Later tweaked by -** a couple of people on Usenet. Completely overhauled by Rich $alz -** <rsalz@bbn.com> and Jim Berets <jberets@bbn.com> in August, 1990; -** -** This grammar has 10 shift/reduce conflicts. -** -** This code is in the public domain and has no copyright. -*/ - -#ifdef __FreeBSD__ -#include <sys/cdefs.h> -__FBSDID("$FreeBSD$"); -#endif - -#include <ctype.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <time.h> - -/* This file defines a single public function. */ -time_t get_date(time_t now, char *); - -/* Basic time units. */ -#define EPOCH 1970 -#define MINUTE (60L) -#define HOUR (60L * MINUTE) -#define DAY (24L * HOUR) - -/* Daylight-savings mode: on, off, or not yet known. */ -enum DSTMODE { DSTon, DSToff, DSTmaybe }; -/* Meridian: am or pm. */ -enum { tAM, tPM }; -/* Token types returned by nexttoken() */ -enum { tAGO = 260, tDAY, tDAYZONE, tAMPM, tMONTH, tMONTH_UNIT, tSEC_UNIT, - tUNUMBER, tZONE, tDST }; -struct token { int token; time_t value; }; - -/* - * Parser state. - */ -struct gdstate { - struct token *tokenp; /* Pointer to next token. */ - /* HaveXxxx counts how many of this kind of phrase we've seen; - * it's a fatal error to have more than one time, zone, day, - * or date phrase. */ - int HaveYear; - int HaveMonth; - int HaveDay; - int HaveWeekDay; /* Day of week */ - int HaveTime; /* Hour/minute/second */ - int HaveZone; /* timezone and/or DST info */ - int HaveRel; /* time offset; we can have more than one */ - /* Absolute time values. */ - time_t Timezone; /* Seconds offset from GMT */ - time_t Day; - time_t Hour; - time_t Minutes; - time_t Month; - time_t Seconds; - time_t Year; - /* DST selection */ - enum DSTMODE DSTmode; - /* Day of week accounting, e.g., "3rd Tuesday" */ - time_t DayOrdinal; /* "3" in "3rd Tuesday" */ - time_t DayNumber; /* "Tuesday" in "3rd Tuesday" */ - /* Relative time values: hour/day/week offsets are measured in - * seconds, month/year are counted in months. */ - time_t RelMonth; - time_t RelSeconds; -}; - -/* - * A series of functions that recognize certain common time phrases. - * Each function returns 1 if it managed to make sense of some of the - * tokens, zero otherwise. - */ - -/* - * hour:minute or hour:minute:second with optional AM, PM, or numeric - * timezone offset - */ -static int -timephrase(struct gdstate *gds) -{ - if (gds->tokenp[0].token == tUNUMBER - && gds->tokenp[1].token == ':' - && gds->tokenp[2].token == tUNUMBER - && gds->tokenp[3].token == ':' - && gds->tokenp[4].token == tUNUMBER) { - /* "12:14:18" or "22:08:07" */ - ++gds->HaveTime; - gds->Hour = gds->tokenp[0].value; - gds->Minutes = gds->tokenp[2].value; - gds->Seconds = gds->tokenp[4].value; - gds->tokenp += 5; - } - else if (gds->tokenp[0].token == tUNUMBER - && gds->tokenp[1].token == ':' - && gds->tokenp[2].token == tUNUMBER) { - /* "12:14" or "22:08" */ - ++gds->HaveTime; - gds->Hour = gds->tokenp[0].value; - gds->Minutes = gds->tokenp[2].value; - gds->Seconds = 0; - gds->tokenp += 3; - } - else if (gds->tokenp[0].token == tUNUMBER - && gds->tokenp[1].token == tAMPM) { - /* "7" is a time if it's followed by "am" or "pm" */ - ++gds->HaveTime; - gds->Hour = gds->tokenp[0].value; - gds->Minutes = gds->Seconds = 0; - /* We'll handle the AM/PM below. */ - gds->tokenp += 1; - } else { - /* We can't handle this. */ - return 0; - } - - if (gds->tokenp[0].token == tAMPM) { - /* "7:12pm", "12:20:13am" */ - if (gds->Hour == 12) - gds->Hour = 0; - if (gds->tokenp[0].value == tPM) - gds->Hour += 12; - gds->tokenp += 1; - } - if (gds->tokenp[0].token == '+' - && gds->tokenp[1].token == tUNUMBER) { - /* "7:14+0700" */ - gds->HaveZone++; - gds->DSTmode = DSToff; - gds->Timezone = - ((gds->tokenp[1].value / 100) * HOUR - + (gds->tokenp[1].value % 100) * MINUTE); - gds->tokenp += 2; - } - if (gds->tokenp[0].token == '-' - && gds->tokenp[1].token == tUNUMBER) { - /* "19:14:12-0530" */ - gds->HaveZone++; - gds->DSTmode = DSToff; - gds->Timezone = + ((gds->tokenp[1].value / 100) * HOUR - + (gds->tokenp[1].value % 100) * MINUTE); - gds->tokenp += 2; - } - return 1; -} - -/* - * Timezone name, possibly including DST. - */ -static int -zonephrase(struct gdstate *gds) -{ - if (gds->tokenp[0].token == tZONE - && gds->tokenp[1].token == tDST) { - gds->HaveZone++; - gds->Timezone = gds->tokenp[0].value; - gds->DSTmode = DSTon; - gds->tokenp += 1; - return 1; - } - - if (gds->tokenp[0].token == tZONE) { - gds->HaveZone++; - gds->Timezone = gds->tokenp[0].value; - gds->DSTmode = DSToff; - gds->tokenp += 1; - return 1; - } - - if (gds->tokenp[0].token == tDAYZONE) { - gds->HaveZone++; - gds->Timezone = gds->tokenp[0].value; - gds->DSTmode = DSTon; - gds->tokenp += 1; - return 1; - } - return 0; -} - -/* - * Year/month/day in various combinations. - */ -static int -datephrase(struct gdstate *gds) -{ - if (gds->tokenp[0].token == tUNUMBER - && gds->tokenp[1].token == '/' - && gds->tokenp[2].token == tUNUMBER - && gds->tokenp[3].token == '/' - && gds->tokenp[4].token == tUNUMBER) { - gds->HaveYear++; - gds->HaveMonth++; - gds->HaveDay++; - if (gds->tokenp[0].value >= 13) { - /* First number is big: 2004/01/29, 99/02/17 */ - gds->Year = gds->tokenp[0].value; - gds->Month = gds->tokenp[2].value; - gds->Day = gds->tokenp[4].value; - } else if ((gds->tokenp[4].value >= 13) - || (gds->tokenp[2].value >= 13)) { - /* Last number is big: 01/07/98 */ - /* Middle number is big: 01/29/04 */ - gds->Month = gds->tokenp[0].value; - gds->Day = gds->tokenp[2].value; - gds->Year = gds->tokenp[4].value; - } else { - /* No significant clues: 02/03/04 */ - gds->Month = gds->tokenp[0].value; - gds->Day = gds->tokenp[2].value; - gds->Year = gds->tokenp[4].value; - } - gds->tokenp += 5; - return 1; - } - - if (gds->tokenp[0].token == tUNUMBER - && gds->tokenp[1].token == '/' - && gds->tokenp[2].token == tUNUMBER) { - /* "1/15" */ - gds->HaveMonth++; - gds->HaveDay++; - gds->Month = gds->tokenp[0].value; - gds->Day = gds->tokenp[2].value; - gds->tokenp += 3; - return 1; - } - - if (gds->tokenp[0].token == tUNUMBER - && gds->tokenp[1].token == '-' - && gds->tokenp[2].token == tUNUMBER - && gds->tokenp[3].token == '-' - && gds->tokenp[4].token == tUNUMBER) { - /* ISO 8601 format. yyyy-mm-dd. */ - gds->HaveYear++; - gds->HaveMonth++; - gds->HaveDay++; - gds->Year = gds->tokenp[0].value; - gds->Month = gds->tokenp[2].value; - gds->Day = gds->tokenp[4].value; - gds->tokenp += 5; - return 1; - } - - if (gds->tokenp[0].token == tUNUMBER - && gds->tokenp[1].token == '-' - && gds->tokenp[2].token == tMONTH - && gds->tokenp[3].token == '-' - && gds->tokenp[4].token == tUNUMBER) { - gds->HaveYear++; - gds->HaveMonth++; - gds->HaveDay++; - if (gds->tokenp[0].value > 31) { - /* e.g. 1992-Jun-17 */ - gds->Year = gds->tokenp[0].value; - gds->Month = gds->tokenp[2].value; - gds->Day = gds->tokenp[4].value; - } else { - /* e.g. 17-JUN-1992. */ - gds->Day = gds->tokenp[0].value; - gds->Month = gds->tokenp[2].value; - gds->Year = gds->tokenp[4].value; - } - gds->tokenp += 5; - return 1; - } - - if (gds->tokenp[0].token == tMONTH - && gds->tokenp[1].token == tUNUMBER - && gds->tokenp[2].token == ',' - && gds->tokenp[3].token == tUNUMBER) { - /* "June 17, 2001" */ - gds->HaveYear++; - gds->HaveMonth++; - gds->HaveDay++; - gds->Month = gds->tokenp[0].value; - gds->Day = gds->tokenp[1].value; - gds->Year = gds->tokenp[3].value; - gds->tokenp += 4; - return 1; - } - - if (gds->tokenp[0].token == tMONTH - && gds->tokenp[1].token == tUNUMBER) { - /* "May 3" */ - gds->HaveMonth++; - gds->HaveDay++; - gds->Month = gds->tokenp[0].value; - gds->Day = gds->tokenp[1].value; - gds->tokenp += 2; - return 1; - } - - if (gds->tokenp[0].token == tUNUMBER - && gds->tokenp[1].token == tMONTH - && gds->tokenp[2].token == tUNUMBER) { - /* "12 Sept 1997" */ - gds->HaveYear++; - gds->HaveMonth++; - gds->HaveDay++; - gds->Day = gds->tokenp[0].value; - gds->Month = gds->tokenp[1].value; - gds->Year = gds->tokenp[2].value; - gds->tokenp += 3; - return 1; - } - - if (gds->tokenp[0].token == tUNUMBER - && gds->tokenp[1].token == tMONTH) { - /* "12 Sept" */ - gds->HaveMonth++; - gds->HaveDay++; - gds->Day = gds->tokenp[0].value; - gds->Month = gds->tokenp[1].value; - gds->tokenp += 2; - return 1; - } - - return 0; -} - -/* - * Relative time phrase: "tomorrow", "yesterday", "+1 hour", etc. - */ -static int -relunitphrase(struct gdstate *gds) -{ - if (gds->tokenp[0].token == '-' - && gds->tokenp[1].token == tUNUMBER - && gds->tokenp[2].token == tSEC_UNIT) { - /* "-3 hours" */ - gds->HaveRel++; - gds->RelSeconds -= gds->tokenp[1].value * gds->tokenp[2].value; - gds->tokenp += 3; - return 1; - } - if (gds->tokenp[0].token == '+' - && gds->tokenp[1].token == tUNUMBER - && gds->tokenp[2].token == tSEC_UNIT) { - /* "+1 minute" */ - gds->HaveRel++; - gds->RelSeconds += gds->tokenp[1].value * gds->tokenp[2].value; - gds->tokenp += 3; - return 1; - } - if (gds->tokenp[0].token == tUNUMBER - && gds->tokenp[1].token == tSEC_UNIT) { - /* "1 day" */ - gds->HaveRel++; - gds->RelSeconds += gds->tokenp[1].value * gds->tokenp[2].value; - gds->tokenp += 3; - return 1; - } - if (gds->tokenp[0].token == '-' - && gds->tokenp[1].token == tUNUMBER - && gds->tokenp[2].token == tMONTH_UNIT) { - /* "-3 months" */ - gds->HaveRel++; - gds->RelMonth -= gds->tokenp[1].value * gds->tokenp[2].value; - gds->tokenp += 3; - return 1; - } - if (gds->tokenp[0].token == '+' - && gds->tokenp[1].token == tUNUMBER - && gds->tokenp[2].token == tMONTH_UNIT) { - /* "+5 years" */ - gds->HaveRel++; - gds->RelMonth += gds->tokenp[1].value * gds->tokenp[2].value; - gds->tokenp += 3; - return 1; - } - if (gds->tokenp[0].token == tUNUMBER - && gds->tokenp[1].token == tMONTH_UNIT) { - /* "2 years" */ - gds->HaveRel++; - gds->RelMonth += gds->tokenp[0].value * gds->tokenp[1].value; - gds->tokenp += 2; - return 1; - } - if (gds->tokenp[0].token == tSEC_UNIT) { - /* "now", "tomorrow" */ - gds->HaveRel++; - gds->RelSeconds += gds->tokenp[0].value; - ++gds->tokenp; - return 1; - } - if (gds->tokenp[0].token == tMONTH_UNIT) { - /* "month" */ - gds->HaveRel++; - gds->RelMonth += gds->tokenp[0].value; - gds->tokenp += 1; - return 1; - } - return 0; -} - -/* - * Day of the week specification. - */ -static int -dayphrase(struct gdstate *gds) -{ - if (gds->tokenp[0].token == tDAY) { - /* "tues", "wednesday," */ - gds->HaveWeekDay++; - gds->DayOrdinal = 1; - gds->DayNumber = gds->tokenp[0].value; - gds->tokenp += 1; - if (gds->tokenp[0].token == ',') - gds->tokenp += 1; - return 1; - } - if (gds->tokenp[0].token == tUNUMBER - && gds->tokenp[1].token == tDAY) { - /* "second tues" "3 wed" */ - gds->HaveWeekDay++; - gds->DayOrdinal = gds->tokenp[0].value; - gds->DayNumber = gds->tokenp[1].value; - gds->tokenp += 2; - return 1; - } - return 0; -} - -/* - * Try to match a phrase using one of the above functions. - * This layer also deals with a couple of generic issues. - */ -static int -phrase(struct gdstate *gds) -{ - if (timephrase(gds)) - return 1; - if (zonephrase(gds)) - return 1; - if (datephrase(gds)) - return 1; - if (dayphrase(gds)) - return 1; - if (relunitphrase(gds)) { - if (gds->tokenp[0].token == tAGO) { - gds->RelSeconds = -gds->RelSeconds; - gds->RelMonth = -gds->RelMonth; - gds->tokenp += 1; - } - return 1; - } - - /* Bare numbers sometimes have meaning. */ - if (gds->tokenp[0].token == tUNUMBER) { - if (gds->HaveTime && !gds->HaveYear && !gds->HaveRel) { - gds->HaveYear++; - gds->Year = gds->tokenp[0].value; - gds->tokenp += 1; - return 1; - } - - if(gds->tokenp[0].value > 10000) { - /* "20040301" */ - gds->HaveYear++; - gds->HaveMonth++; - gds->HaveDay++; - gds->Day= (gds->tokenp[0].value)%100; - gds->Month= (gds->tokenp[0].value/100)%100; - gds->Year = gds->tokenp[0].value/10000; - gds->tokenp += 1; - return 1; - } - - if (gds->tokenp[0].value < 24) { - gds->HaveTime++; - gds->Hour = gds->tokenp[0].value; - gds->Minutes = 0; - gds->Seconds = 0; - gds->tokenp += 1; - return 1; - } - - if ((gds->tokenp[0].value / 100 < 24) - && (gds->tokenp[0].value % 100 < 60)) { - /* "513" is same as "5:13" */ - gds->Hour = gds->tokenp[0].value / 100; - gds->Minutes = gds->tokenp[0].value % 100; - gds->Seconds = 0; - gds->tokenp += 1; - return 1; - } - } - - return 0; -} - -/* - * A dictionary of time words. - */ -static struct LEXICON { - size_t abbrev; - const char *name; - int type; - time_t value; -} const TimeWords[] = { - /* am/pm */ - { 0, "am", tAMPM, tAM }, - { 0, "pm", tAMPM, tPM }, - - /* Month names. */ - { 3, "january", tMONTH, 1 }, - { 3, "february", tMONTH, 2 }, - { 3, "march", tMONTH, 3 }, - { 3, "april", tMONTH, 4 }, - { 3, "may", tMONTH, 5 }, - { 3, "june", tMONTH, 6 }, - { 3, "july", tMONTH, 7 }, - { 3, "august", tMONTH, 8 }, - { 3, "september", tMONTH, 9 }, - { 3, "october", tMONTH, 10 }, - { 3, "november", tMONTH, 11 }, - { 3, "december", tMONTH, 12 }, - - /* Days of the week. */ - { 2, "sunday", tDAY, 0 }, - { 3, "monday", tDAY, 1 }, - { 2, "tuesday", tDAY, 2 }, - { 3, "wednesday", tDAY, 3 }, - { 2, "thursday", tDAY, 4 }, - { 2, "friday", tDAY, 5 }, - { 2, "saturday", tDAY, 6 }, - - /* Timezones: Offsets are in seconds. */ - { 0, "gmt", tZONE, 0*HOUR }, /* Greenwich Mean */ - { 0, "ut", tZONE, 0*HOUR }, /* Universal (Coordinated) */ - { 0, "utc", tZONE, 0*HOUR }, - { 0, "wet", tZONE, 0*HOUR }, /* Western European */ - { 0, "bst", tDAYZONE, 0*HOUR }, /* British Summer */ - { 0, "wat", tZONE, 1*HOUR }, /* West Africa */ - { 0, "at", tZONE, 2*HOUR }, /* Azores */ - /* { 0, "bst", tZONE, 3*HOUR }, */ /* Brazil Standard: Conflict */ - /* { 0, "gst", tZONE, 3*HOUR }, */ /* Greenland Standard: Conflict*/ - { 0, "nft", tZONE, 3*HOUR+30*MINUTE }, /* Newfoundland */ - { 0, "nst", tZONE, 3*HOUR+30*MINUTE }, /* Newfoundland Standard */ - { 0, "ndt", tDAYZONE, 3*HOUR+30*MINUTE }, /* Newfoundland Daylight */ - { 0, "ast", tZONE, 4*HOUR }, /* Atlantic Standard */ - { 0, "adt", tDAYZONE, 4*HOUR }, /* Atlantic Daylight */ - { 0, "est", tZONE, 5*HOUR }, /* Eastern Standard */ - { 0, "edt", tDAYZONE, 5*HOUR }, /* Eastern Daylight */ - { 0, "cst", tZONE, 6*HOUR }, /* Central Standard */ - { 0, "cdt", tDAYZONE, 6*HOUR }, /* Central Daylight */ - { 0, "mst", tZONE, 7*HOUR }, /* Mountain Standard */ - { 0, "mdt", tDAYZONE, 7*HOUR }, /* Mountain Daylight */ - { 0, "pst", tZONE, 8*HOUR }, /* Pacific Standard */ - { 0, "pdt", tDAYZONE, 8*HOUR }, /* Pacific Daylight */ - { 0, "yst", tZONE, 9*HOUR }, /* Yukon Standard */ - { 0, "ydt", tDAYZONE, 9*HOUR }, /* Yukon Daylight */ - { 0, "hst", tZONE, 10*HOUR }, /* Hawaii Standard */ - { 0, "hdt", tDAYZONE, 10*HOUR }, /* Hawaii Daylight */ - { 0, "cat", tZONE, 10*HOUR }, /* Central Alaska */ - { 0, "ahst", tZONE, 10*HOUR }, /* Alaska-Hawaii Standard */ - { 0, "nt", tZONE, 11*HOUR }, /* Nome */ - { 0, "idlw", tZONE, 12*HOUR }, /* Intl Date Line West */ - { 0, "cet", tZONE, -1*HOUR }, /* Central European */ - { 0, "met", tZONE, -1*HOUR }, /* Middle European */ - { 0, "mewt", tZONE, -1*HOUR }, /* Middle European Winter */ - { 0, "mest", tDAYZONE, -1*HOUR }, /* Middle European Summer */ - { 0, "swt", tZONE, -1*HOUR }, /* Swedish Winter */ - { 0, "sst", tDAYZONE, -1*HOUR }, /* Swedish Summer */ - { 0, "fwt", tZONE, -1*HOUR }, /* French Winter */ - { 0, "fst", tDAYZONE, -1*HOUR }, /* French Summer */ - { 0, "eet", tZONE, -2*HOUR }, /* Eastern Eur, USSR Zone 1 */ - { 0, "bt", tZONE, -3*HOUR }, /* Baghdad, USSR Zone 2 */ - { 0, "it", tZONE, -3*HOUR-30*MINUTE },/* Iran */ - { 0, "zp4", tZONE, -4*HOUR }, /* USSR Zone 3 */ - { 0, "zp5", tZONE, -5*HOUR }, /* USSR Zone 4 */ - { 0, "ist", tZONE, -5*HOUR-30*MINUTE },/* Indian Standard */ - { 0, "zp6", tZONE, -6*HOUR }, /* USSR Zone 5 */ - /* { 0, "nst", tZONE, -6.5*HOUR }, */ /* North Sumatra: Conflict */ - /* { 0, "sst", tZONE, -7*HOUR }, */ /* So Sumatra, USSR 6: Conflict */ - { 0, "wast", tZONE, -7*HOUR }, /* West Australian Standard */ - { 0, "wadt", tDAYZONE, -7*HOUR }, /* West Australian Daylight */ - { 0, "jt", tZONE, -7*HOUR-30*MINUTE },/* Java (3pm in Cronusland!)*/ - { 0, "cct", tZONE, -8*HOUR }, /* China Coast, USSR Zone 7 */ - { 0, "jst", tZONE, -9*HOUR }, /* Japan Std, USSR Zone 8 */ - { 0, "cast", tZONE, -9*HOUR-30*MINUTE },/* Ctrl Australian Std */ - { 0, "cadt", tDAYZONE, -9*HOUR-30*MINUTE },/* Ctrl Australian Daylt */ - { 0, "east", tZONE, -10*HOUR }, /* Eastern Australian Std */ - { 0, "eadt", tDAYZONE, -10*HOUR }, /* Eastern Australian Daylt */ - { 0, "gst", tZONE, -10*HOUR }, /* Guam Std, USSR Zone 9 */ - { 0, "nzt", tZONE, -12*HOUR }, /* New Zealand */ - { 0, "nzst", tZONE, -12*HOUR }, /* New Zealand Standard */ - { 0, "nzdt", tDAYZONE, -12*HOUR }, /* New Zealand Daylight */ - { 0, "idle", tZONE, -12*HOUR }, /* 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 * DAY }, - { 4, "weeks", tSEC_UNIT, 7 * DAY }, - { 3, "days", tSEC_UNIT, DAY }, - { 4, "hours", tSEC_UNIT, HOUR }, - { 3, "minutes", tSEC_UNIT, MINUTE }, - { 3, "seconds", tSEC_UNIT, 1 }, - - /* Relative-time words. */ - { 0, "tomorrow", tSEC_UNIT, DAY }, - { 0, "yesterday", tSEC_UNIT, -DAY }, - { 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, 1*HOUR }, - { 0, "b", tZONE, 2*HOUR }, - { 0, "c", tZONE, 3*HOUR }, - { 0, "d", tZONE, 4*HOUR }, - { 0, "e", tZONE, 5*HOUR }, - { 0, "f", tZONE, 6*HOUR }, - { 0, "g", tZONE, 7*HOUR }, - { 0, "h", tZONE, 8*HOUR }, - { 0, "i", tZONE, 9*HOUR }, - { 0, "k", tZONE, 10*HOUR }, - { 0, "l", tZONE, 11*HOUR }, - { 0, "m", tZONE, 12*HOUR }, - { 0, "n", tZONE, -1*HOUR }, - { 0, "o", tZONE, -2*HOUR }, - { 0, "p", tZONE, -3*HOUR }, - { 0, "q", tZONE, -4*HOUR }, - { 0, "r", tZONE, -5*HOUR }, - { 0, "s", tZONE, -6*HOUR }, - { 0, "t", tZONE, -7*HOUR }, - { 0, "u", tZONE, -8*HOUR }, - { 0, "v", tZONE, -9*HOUR }, - { 0, "w", tZONE, -10*HOUR }, - { 0, "x", tZONE, -11*HOUR }, - { 0, "y", tZONE, -12*HOUR }, - { 0, "z", tZONE, 0*HOUR }, - - /* End of table. */ - { 0, NULL, 0, 0 } -}; - -/* - * 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, - time_t Timezone, enum DSTMODE DSTmode) -{ - static int DaysInMonth[12] = { - 31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 - }; - 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] - || Hours < 0 || Hours > 23 - || Minutes < 0 || Minutes > 59 - || Seconds < 0 || Seconds > 59) - 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 *= DAY; - Julian += Timezone; - Julian += Hours * HOUR + Minutes * MINUTE + Seconds; - if (DSTmode == DSTon - || (DSTmode == DSTmaybe && localtime(&Julian)->tm_isdst)) - Julian -= HOUR; - 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) * HOUR; -} - - -static time_t -RelativeDate(time_t Start, time_t zone, int dstmode, - time_t DayOrdinal, time_t DayNumber) -{ - struct tm *tm; - time_t t, now; - - t = Start - zone; - tm = gmtime(&t); - now = Start; - now += DAY * ((DayNumber - tm->tm_wday + 7) % 7); - now += 7 * DAY * (DayOrdinal <= 0 ? DayOrdinal : DayOrdinal - 1); - if (dstmode == DSTmaybe) - return DSTcorrect(Start, now); - return now - Start; -} - - -static time_t -RelativeMonth(time_t Start, time_t Timezone, 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, - Timezone, DSTmaybe)); -} - -/* - * Tokenizer. - */ -static int -nexttoken(char **in, time_t *value) -{ - char c; - char buff[64]; - - for ( ; ; ) { - while (isspace((unsigned char)**in)) - ++*in; - - /* Skip parenthesized comments. */ - if (**in == '(') { - int Count = 0; - do { - c = *(*in)++; - 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 = *in; - const struct LEXICON *tp; - unsigned i = 0; - - /* Force to lowercase and strip '.' characters. */ - while (*src != '\0' - && (isalnum((unsigned char)*src) || *src == '.') - && i < sizeof(buff)-1) { - if (*src != '.') { - if (isupper((unsigned char)*src)) - buff[i++] = tolower((unsigned char)*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. */ - *in = src; - /* Return the match. */ - *value = 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((unsigned char)(c = **in))) { - for (*value = 0; isdigit((unsigned char)(c = *(*in)++)); ) - *value = 10 * *value + c - '0'; - (*in)--; - return (tUNUMBER); - } - - return *(*in)++; - } -} - -#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 (days * DAY + (a->tm_hour - b->tm_hour) * HOUR - + (a->tm_min - b->tm_min) * MINUTE - + (a->tm_sec - b->tm_sec)); -} - -/* - * - * The public function. - * - * TODO: tokens[] array should be dynamically sized. - */ -time_t -get_date(time_t now, char *p) -{ - struct token tokens[256]; - struct gdstate _gds; - struct token *lasttoken; - struct gdstate *gds; - struct tm local, *tm; - struct tm gmt, *gmt_ptr; - time_t Start; - time_t tod; - long tzone; - - /* Clear out the parsed token array. */ - memset(tokens, 0, sizeof(tokens)); - /* Initialize the parser state. */ - memset(&_gds, 0, sizeof(_gds)); - gds = &_gds; - - /* Look up the current time. */ - memset(&local, 0, sizeof(local)); - tm = localtime (&now); - if (tm == NULL) - return -1; - local = *tm; - - /* Look up UTC if we can and use that to determine the current - * timezone offset. */ - memset(&gmt, 0, sizeof(gmt)); - gmt_ptr = gmtime (&now); - if (gmt_ptr != NULL) { - /* Copy, in case localtime and gmtime use the same buffer. */ - gmt = *gmt_ptr; - } - if (gmt_ptr != NULL) - tzone = difftm (&gmt, &local); - else - /* This system doesn't understand timezones; fake it. */ - tzone = 0; - if(local.tm_isdst) - tzone += HOUR; - - /* Tokenize the input string. */ - lasttoken = tokens; - while ((lasttoken->token = nexttoken(&p, &lasttoken->value)) != 0) { - ++lasttoken; - if (lasttoken > tokens + 255) - return -1; - } - gds->tokenp = tokens; - - /* Match phrases until we run out of input tokens. */ - while (gds->tokenp < lasttoken) { - if (!phrase(gds)) - return -1; - } - - /* Use current local timezone if none was specified. */ - if (!gds->HaveZone) { - gds->Timezone = tzone; - gds->DSTmode = DSTmaybe; - } - - /* If a timezone was specified, use that for generating the default - * time components instead of the local timezone. */ - if (gds->HaveZone && gmt_ptr != NULL) { - now -= gds->Timezone; - gmt_ptr = gmtime (&now); - if (gmt_ptr != NULL) - local = *gmt_ptr; - now += gds->Timezone; - } - - if (!gds->HaveYear) - gds->Year = local.tm_year + 1900; - if (!gds->HaveMonth) - gds->Month = local.tm_mon + 1; - if (!gds->HaveDay) - gds->Day = local.tm_mday; - /* Note: No default for hour/min/sec; a specifier that just - * gives date always refers to 00:00 on that date. */ - - /* If we saw more than one time, timezone, weekday, year, month, - * or day, then give up. */ - if (gds->HaveTime > 1 || gds->HaveZone > 1 || gds->HaveWeekDay > 1 - || gds->HaveYear > 1 || gds->HaveMonth > 1 || gds->HaveDay > 1) - return -1; - - /* Compute an absolute time based on whatever absolute information - * we collected. */ - if (gds->HaveYear || gds->HaveMonth || gds->HaveDay - || gds->HaveTime || gds->HaveWeekDay) { - Start = Convert(gds->Month, gds->Day, gds->Year, - gds->Hour, gds->Minutes, gds->Seconds, - gds->Timezone, gds->DSTmode); - if (Start < 0) - return -1; - } else { - Start = now; - if (!gds->HaveRel) - Start -= local.tm_hour * HOUR + local.tm_min * MINUTE - + local.tm_sec; - } - - /* Add the relative offset. */ - Start += gds->RelSeconds; - Start += RelativeMonth(Start, gds->Timezone, gds->RelMonth); - - /* Adjust for day-of-week offsets. */ - if (gds->HaveWeekDay - && !(gds->HaveYear || gds->HaveMonth || gds->HaveDay)) { - tod = RelativeDate(Start, gds->Timezone, - gds->DSTmode, gds->DayOrdinal, gds->DayNumber); - Start += tod; - } - - /* -1 is an error indicator, so return 0 instead of -1 if - * that's the actual time. */ - 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) */ |