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postgresql/src/backend/utils/adt/datetime.c

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/*-------------------------------------------------------------------------
*
* datetime.c
* Support functions for date/time types.
*
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/datetime.c,v 1.128 2004/05/21 05:08:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <ctype.h>
#include <errno.h>
#include <float.h>
#include <limits.h>
#include <math.h>
#include "miscadmin.h"
#include "utils/datetime.h"
#include "utils/guc.h"
static int DecodeNumber(int flen, char *field, bool haveTextMonth,
int fmask, int *tmask,
struct pg_tm * tm, fsec_t *fsec, int *is2digits);
static int DecodeNumberField(int len, char *str,
int fmask, int *tmask,
struct pg_tm * tm, fsec_t *fsec, int *is2digits);
static int DecodeTime(char *str, int fmask, int *tmask,
struct pg_tm * tm, fsec_t *fsec);
static int DecodeTimezone(char *str, int *tzp);
static int DecodePosixTimezone(char *str, int *tzp);
static datetkn *datebsearch(char *key, datetkn *base, unsigned int nel);
static int DecodeDate(char *str, int fmask, int *tmask, struct pg_tm * tm);
static void TrimTrailingZeros(char *str);
int day_tab[2][13] = {
{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31, 0},
{31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31, 0}};
char *months[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec", NULL};
char *days[] = {"Sunday", "Monday", "Tuesday", "Wednesday",
"Thursday", "Friday", "Saturday", NULL};
/*****************************************************************************
* PRIVATE ROUTINES *
*****************************************************************************/
/*
* Definitions for squeezing values into "value"
* We set aside a high bit for a sign, and scale the timezone offsets
* in minutes by a factor of 15 (so can represent quarter-hour increments).
*/
#define ABS_SIGNBIT ((char) 0200)
#define VALMASK ((char) 0177)
#define POS(n) (n)
#define NEG(n) ((n)|ABS_SIGNBIT)
#define SIGNEDCHAR(c) ((c)&ABS_SIGNBIT? -((c)&VALMASK): (c))
#define FROMVAL(tp) (-SIGNEDCHAR((tp)->value) * 15) /* uncompress */
#define TOVAL(tp, v) ((tp)->value = ((v) < 0? NEG((-(v))/15): POS(v)/15))
/*
* datetktbl holds date/time keywords.
*
* Note that this table must be strictly alphabetically ordered to allow an
* O(ln(N)) search algorithm to be used.
*
* The text field is NOT guaranteed to be NULL-terminated.
*
* To keep this table reasonably small, we divide the lexval for TZ and DTZ
* entries by 15 (so they are on 15 minute boundaries) and truncate the text
* field at TOKMAXLEN characters.
* Formerly, we divided by 10 rather than 15 but there are a few time zones
* which are 30 or 45 minutes away from an even hour, most are on an hour
* boundary, and none on other boundaries.
*
* Let's include all strings from my current zic time zone database.
* Not all of them are unique, or even very understandable, so we will
* leave some commented out for now.
*/
static datetkn datetktbl[] = {
/* text, token, lexval */
{EARLY, RESERV, DTK_EARLY}, /* "-infinity" reserved for "early time" */
{"abstime", IGNORE_DTF, 0}, /* for pre-v6.1 "Invalid Abstime" */
{"acsst", DTZ, POS(42)}, /* Cent. Australia */
{"acst", DTZ, NEG(16)}, /* Atlantic/Porto Acre Summer Time */
{"act", TZ, NEG(20)}, /* Atlantic/Porto Acre Time */
{DA_D, ADBC, AD}, /* "ad" for years > 0 */
{"adt", DTZ, NEG(12)}, /* Atlantic Daylight Time */
{"aesst", DTZ, POS(44)}, /* E. Australia */
{"aest", TZ, POS(40)}, /* Australia Eastern Std Time */
{"aft", TZ, POS(18)}, /* Kabul */
{"ahst", TZ, NEG(40)}, /* Alaska-Hawaii Std Time */
{"akdt", DTZ, NEG(32)}, /* Alaska Daylight Time */
{"akst", DTZ, NEG(36)}, /* Alaska Standard Time */
{"allballs", RESERV, DTK_ZULU}, /* 00:00:00 */
{"almst", TZ, POS(28)}, /* Almaty Savings Time */
{"almt", TZ, POS(24)}, /* Almaty Time */
{"am", AMPM, AM},
{"amst", DTZ, POS(20)}, /* Armenia Summer Time (Yerevan) */
#if 0
{"amst", DTZ, NEG(12)}, /* Amazon Summer Time (Porto Velho) */
#endif
{"amt", TZ, POS(16)}, /* Armenia Time (Yerevan) */
#if 0
{"amt", TZ, NEG(16)}, /* Amazon Time (Porto Velho) */
#endif
{"anast", DTZ, POS(52)}, /* Anadyr Summer Time (Russia) */
{"anat", TZ, POS(48)}, /* Anadyr Time (Russia) */
{"apr", MONTH, 4},
{"april", MONTH, 4},
#if 0
aqtst
aqtt
arst
#endif
{"art", TZ, NEG(12)}, /* Argentina Time */
#if 0
ashst
ast /* Atlantic Standard Time, Arabia Standard
* Time, Acre Standard Time */
#endif
{"ast", TZ, NEG(16)}, /* Atlantic Std Time (Canada) */
{"at", IGNORE_DTF, 0}, /* "at" (throwaway) */
{"aug", MONTH, 8},
{"august", MONTH, 8},
{"awsst", DTZ, POS(36)}, /* W. Australia */
{"awst", TZ, POS(32)}, /* W. Australia */
{"awt", DTZ, NEG(12)},
{"azost", DTZ, POS(0)}, /* Azores Summer Time */
{"azot", TZ, NEG(4)}, /* Azores Time */
{"azst", DTZ, POS(20)}, /* Azerbaijan Summer Time */
{"azt", TZ, POS(16)}, /* Azerbaijan Time */
{DB_C, ADBC, BC}, /* "bc" for years <= 0 */
{"bdst", TZ, POS(8)}, /* British Double Summer Time */
{"bdt", TZ, POS(24)}, /* Dacca */
{"bnt", TZ, POS(32)}, /* Brunei Darussalam Time */
{"bort", TZ, POS(32)}, /* Borneo Time (Indonesia) */
#if 0
bortst
bost
#endif
{"bot", TZ, NEG(16)}, /* Bolivia Time */
{"bra", TZ, NEG(12)}, /* Brazil Time */
{"brst", DTZ, NEG(8)}, /* Brasilia Summer Time */
{"brt", TZ, NEG(12)}, /* Brasilia Time */
{"bst", DTZ, POS(4)}, /* British Summer Time */
#if 0
{"bst", TZ, NEG(12)}, /* Brazil Standard Time */
{"bst", DTZ, NEG(44)}, /* Bering Summer Time */
#endif
{"bt", TZ, POS(12)}, /* Baghdad Time */
{"btt", TZ, POS(24)}, /* Bhutan Time */
{"cadt", DTZ, POS(42)}, /* Central Australian DST */
{"cast", TZ, POS(38)}, /* Central Australian ST */
{"cat", TZ, NEG(40)}, /* Central Alaska Time */
{"cct", TZ, POS(32)}, /* China Coast Time */
#if 0
{"cct", TZ, POS(26)}, /* Indian Cocos (Island) Time */
#endif
{"cdt", DTZ, NEG(20)}, /* Central Daylight Time */
{"cest", DTZ, POS(8)}, /* Central European Dayl.Time */
{"cet", TZ, POS(4)}, /* Central European Time */
{"cetdst", DTZ, POS(8)}, /* Central European Dayl.Time */
{"chadt", DTZ, POS(55)}, /* Chatham Island Daylight Time (13:45) */
{"chast", TZ, POS(51)}, /* Chatham Island Time (12:45) */
#if 0
ckhst
#endif
{"ckt", TZ, POS(48)}, /* Cook Islands Time */
{"clst", DTZ, NEG(12)}, /* Chile Summer Time */
{"clt", TZ, NEG(16)}, /* Chile Time */
#if 0
cost
#endif
{"cot", TZ, NEG(20)}, /* Columbia Time */
{"cst", TZ, NEG(24)}, /* Central Standard Time */
{DCURRENT, RESERV, DTK_CURRENT}, /* "current" is always now */
#if 0
cvst
#endif
{"cvt", TZ, POS(28)}, /* Christmas Island Time (Indian Ocean) */
{"cxt", TZ, POS(28)}, /* Christmas Island Time (Indian Ocean) */
{"d", UNITS, DTK_DAY}, /* "day of month" for ISO input */
{"davt", TZ, POS(28)}, /* Davis Time (Antarctica) */
{"ddut", TZ, POS(40)}, /* Dumont-d'Urville Time (Antarctica) */
{"dec", MONTH, 12},
{"december", MONTH, 12},
{"dnt", TZ, POS(4)}, /* Dansk Normal Tid */
{"dow", RESERV, DTK_DOW}, /* day of week */
{"doy", RESERV, DTK_DOY}, /* day of year */
{"dst", DTZMOD, 6},
#if 0
{"dusst", DTZ, POS(24)}, /* Dushanbe Summer Time */
#endif
{"easst", DTZ, NEG(20)}, /* Easter Island Summer Time */
{"east", TZ, NEG(24)}, /* Easter Island Time */
{"eat", TZ, POS(12)}, /* East Africa Time */
#if 0
{"east", DTZ, POS(16)}, /* Indian Antananarivo Savings Time */
{"eat", TZ, POS(12)}, /* Indian Antananarivo Time */
{"ect", TZ, NEG(16)}, /* Eastern Caribbean Time */
{"ect", TZ, NEG(20)}, /* Ecuador Time */
#endif
{"edt", DTZ, NEG(16)}, /* Eastern Daylight Time */
{"eest", DTZ, POS(12)}, /* Eastern Europe Summer Time */
{"eet", TZ, POS(8)}, /* East. Europe, USSR Zone 1 */
{"eetdst", DTZ, POS(12)}, /* Eastern Europe Daylight Time */
{"egst", DTZ, POS(0)}, /* East Greenland Summer Time */
{"egt", TZ, NEG(4)}, /* East Greenland Time */
#if 0
ehdt
#endif
{EPOCH, RESERV, DTK_EPOCH}, /* "epoch" reserved for system epoch time */
{"est", TZ, NEG(20)}, /* Eastern Standard Time */
{"feb", MONTH, 2},
{"february", MONTH, 2},
{"fjst", DTZ, NEG(52)}, /* Fiji Summer Time (13 hour offset!) */
{"fjt", TZ, NEG(48)}, /* Fiji Time */
{"fkst", DTZ, NEG(12)}, /* Falkland Islands Summer Time */
{"fkt", TZ, NEG(8)}, /* Falkland Islands Time */
{"fnst", DTZ, NEG(4)}, /* Fernando de Noronha Summer Time */
{"fnt", TZ, NEG(8)}, /* Fernando de Noronha Time */
{"fri", DOW, 5},
{"friday", DOW, 5},
{"fst", TZ, POS(4)}, /* French Summer Time */
{"fwt", DTZ, POS(8)}, /* French Winter Time */
{"galt", TZ, NEG(24)}, /* Galapagos Time */
{"gamt", TZ, NEG(36)}, /* Gambier Time */
{"gest", DTZ, POS(20)}, /* Georgia Summer Time */
{"get", TZ, POS(16)}, /* Georgia Time */
{"gft", TZ, NEG(12)}, /* French Guiana Time */
#if 0
ghst
#endif
{"gilt", TZ, POS(48)}, /* Gilbert Islands Time */
{"gmt", TZ, POS(0)}, /* Greenwich Mean Time */
{"gst", TZ, POS(40)}, /* Guam Std Time, USSR Zone 9 */
{"gyt", TZ, NEG(16)}, /* Guyana Time */
{"h", UNITS, DTK_HOUR}, /* "hour" */
#if 0
hadt
hast
#endif
{"hdt", DTZ, NEG(36)}, /* Hawaii/Alaska Daylight Time */
#if 0
hkst
#endif
{"hkt", TZ, POS(32)}, /* Hong Kong Time */
#if 0
{"hmt", TZ, POS(12)}, /* Hellas ? ? */
hovst
hovt
#endif
{"hst", TZ, NEG(40)}, /* Hawaii Std Time */
#if 0
hwt
#endif
{"ict", TZ, POS(28)}, /* Indochina Time */
{"idle", TZ, POS(48)}, /* Intl. Date Line, East */
{"idlw", TZ, NEG(48)}, /* Intl. Date Line, West */
#if 0
idt /* Israeli, Iran, Indian Daylight Time */
#endif
{LATE, RESERV, DTK_LATE}, /* "infinity" reserved for "late time" */
{INVALID, RESERV, DTK_INVALID}, /* "invalid" reserved for bad time */
{"iot", TZ, POS(20)}, /* Indian Chagos Time */
{"irkst", DTZ, POS(36)}, /* Irkutsk Summer Time */
{"irkt", TZ, POS(32)}, /* Irkutsk Time */
{"irt", TZ, POS(14)}, /* Iran Time */
#if 0
isst
#endif
{"ist", TZ, POS(8)}, /* Israel */
{"it", TZ, POS(14)}, /* Iran Time */
{"j", UNITS, DTK_JULIAN},
{"jan", MONTH, 1},
{"january", MONTH, 1},
{"javt", TZ, POS(28)}, /* Java Time (07:00? see JT) */
{"jayt", TZ, POS(36)}, /* Jayapura Time (Indonesia) */
{"jd", UNITS, DTK_JULIAN},
{"jst", TZ, POS(36)}, /* Japan Std Time,USSR Zone 8 */
{"jt", TZ, POS(30)}, /* Java Time (07:30? see JAVT) */
{"jul", MONTH, 7},
{"julian", UNITS, DTK_JULIAN},
{"july", MONTH, 7},
{"jun", MONTH, 6},
{"june", MONTH, 6},
{"kdt", DTZ, POS(40)}, /* Korea Daylight Time */
{"kgst", DTZ, POS(24)}, /* Kyrgyzstan Summer Time */
{"kgt", TZ, POS(20)}, /* Kyrgyzstan Time */
{"kost", TZ, POS(48)}, /* Kosrae Time */
{"krast", DTZ, POS(28)}, /* Krasnoyarsk Summer Time */
{"krat", TZ, POS(32)}, /* Krasnoyarsk Standard Time */
{"kst", TZ, POS(36)}, /* Korea Standard Time */
{"lhdt", DTZ, POS(44)}, /* Lord Howe Daylight Time, Australia */
{"lhst", TZ, POS(42)}, /* Lord Howe Standard Time, Australia */
{"ligt", TZ, POS(40)}, /* From Melbourne, Australia */
{"lint", TZ, POS(56)}, /* Line Islands Time (Kiribati; +14
* hours!) */
{"lkt", TZ, POS(24)}, /* Lanka Time */
{"m", UNITS, DTK_MONTH}, /* "month" for ISO input */
{"magst", DTZ, POS(48)}, /* Magadan Summer Time */
{"magt", TZ, POS(44)}, /* Magadan Time */
{"mar", MONTH, 3},
{"march", MONTH, 3},
{"mart", TZ, NEG(38)}, /* Marquesas Time */
{"mawt", TZ, POS(24)}, /* Mawson, Antarctica */
{"may", MONTH, 5},
{"mdt", DTZ, NEG(24)}, /* Mountain Daylight Time */
{"mest", DTZ, POS(8)}, /* Middle Europe Summer Time */
{"met", TZ, POS(4)}, /* Middle Europe Time */
{"metdst", DTZ, POS(8)}, /* Middle Europe Daylight Time */
{"mewt", TZ, POS(4)}, /* Middle Europe Winter Time */
{"mez", TZ, POS(4)}, /* Middle Europe Zone */
{"mht", TZ, POS(48)}, /* Kwajalein */
{"mm", UNITS, DTK_MINUTE}, /* "minute" for ISO input */
{"mmt", TZ, POS(26)}, /* Myanmar Time */
{"mon", DOW, 1},
{"monday", DOW, 1},
#if 0
most
#endif
{"mpt", TZ, POS(40)}, /* North Mariana Islands Time */
{"msd", DTZ, POS(16)}, /* Moscow Summer Time */
{"msk", TZ, POS(12)}, /* Moscow Time */
{"mst", TZ, NEG(28)}, /* Mountain Standard Time */
{"mt", TZ, POS(34)}, /* Moluccas Time */
{"mut", TZ, POS(16)}, /* Mauritius Island Time */
{"mvt", TZ, POS(20)}, /* Maldives Island Time */
{"myt", TZ, POS(32)}, /* Malaysia Time */
#if 0
ncst
#endif
{"nct", TZ, POS(44)}, /* New Caledonia Time */
{"ndt", DTZ, NEG(10)}, /* Nfld. Daylight Time */
{"nft", TZ, NEG(14)}, /* Newfoundland Standard Time */
{"nor", TZ, POS(4)}, /* Norway Standard Time */
{"nov", MONTH, 11},
{"november", MONTH, 11},
{"novst", DTZ, POS(28)}, /* Novosibirsk Summer Time */
{"novt", TZ, POS(24)}, /* Novosibirsk Standard Time */
{NOW, RESERV, DTK_NOW}, /* current transaction time */
{"npt", TZ, POS(23)}, /* Nepal Standard Time (GMT-5:45) */
{"nst", TZ, NEG(14)}, /* Nfld. Standard Time */
{"nt", TZ, NEG(44)}, /* Nome Time */
{"nut", TZ, NEG(44)}, /* Niue Time */
{"nzdt", DTZ, POS(52)}, /* New Zealand Daylight Time */
{"nzst", TZ, POS(48)}, /* New Zealand Standard Time */
{"nzt", TZ, POS(48)}, /* New Zealand Time */
{"oct", MONTH, 10},
{"october", MONTH, 10},
{"omsst", DTZ, POS(28)}, /* Omsk Summer Time */
{"omst", TZ, POS(24)}, /* Omsk Time */
{"on", IGNORE_DTF, 0}, /* "on" (throwaway) */
{"pdt", DTZ, NEG(28)}, /* Pacific Daylight Time */
#if 0
pest
#endif
{"pet", TZ, NEG(20)}, /* Peru Time */
{"petst", DTZ, POS(52)}, /* Petropavlovsk-Kamchatski Summer Time */
{"pett", TZ, POS(48)}, /* Petropavlovsk-Kamchatski Time */
{"pgt", TZ, POS(40)}, /* Papua New Guinea Time */
{"phot", TZ, POS(52)}, /* Phoenix Islands (Kiribati) Time */
#if 0
phst
#endif
{"pht", TZ, POS(32)}, /* Phillipine Time */
{"pkt", TZ, POS(20)}, /* Pakistan Time */
{"pm", AMPM, PM},
{"pmdt", DTZ, NEG(8)}, /* Pierre & Miquelon Daylight Time */
#if 0
pmst
#endif
{"pont", TZ, POS(44)}, /* Ponape Time (Micronesia) */
{"pst", TZ, NEG(32)}, /* Pacific Standard Time */
{"pwt", TZ, POS(36)}, /* Palau Time */
{"pyst", DTZ, NEG(12)}, /* Paraguay Summer Time */
{"pyt", TZ, NEG(16)}, /* Paraguay Time */
{"ret", DTZ, POS(16)}, /* Reunion Island Time */
{"s", UNITS, DTK_SECOND}, /* "seconds" for ISO input */
{"sadt", DTZ, POS(42)}, /* S. Australian Dayl. Time */
#if 0
samst
samt
#endif
{"sast", TZ, POS(38)}, /* South Australian Std Time */
{"sat", DOW, 6},
{"saturday", DOW, 6},
#if 0
sbt
#endif
{"sct", DTZ, POS(16)}, /* Mahe Island Time */
{"sep", MONTH, 9},
{"sept", MONTH, 9},
{"september", MONTH, 9},
{"set", TZ, NEG(4)}, /* Seychelles Time ?? */
#if 0
sgt
#endif
{"sst", DTZ, POS(8)}, /* Swedish Summer Time */
{"sun", DOW, 0},
{"sunday", DOW, 0},
{"swt", TZ, POS(4)}, /* Swedish Winter Time */
#if 0
syot
#endif
{"t", ISOTIME, DTK_TIME}, /* Filler for ISO time fields */
{"tft", TZ, POS(20)}, /* Kerguelen Time */
{"that", TZ, NEG(40)}, /* Tahiti Time */
{"thu", DOW, 4},
{"thur", DOW, 4},
{"thurs", DOW, 4},
{"thursday", DOW, 4},
{"tjt", TZ, POS(20)}, /* Tajikistan Time */
{"tkt", TZ, NEG(40)}, /* Tokelau Time */
{"tmt", TZ, POS(20)}, /* Turkmenistan Time */
{TODAY, RESERV, DTK_TODAY}, /* midnight */
{TOMORROW, RESERV, DTK_TOMORROW}, /* tomorrow midnight */
#if 0
tost
#endif
{"tot", TZ, POS(52)}, /* Tonga Time */
#if 0
tpt
#endif
{"truk", TZ, POS(40)}, /* Truk Time */
{"tue", DOW, 2},
{"tues", DOW, 2},
{"tuesday", DOW, 2},
{"tvt", TZ, POS(48)}, /* Tuvalu Time */
#if 0
uct
#endif
{"ulast", DTZ, POS(36)}, /* Ulan Bator Summer Time */
{"ulat", TZ, POS(32)}, /* Ulan Bator Time */
{"undefined", RESERV, DTK_INVALID}, /* pre-v6.1 invalid time */
{"ut", TZ, POS(0)},
{"utc", TZ, POS(0)},
{"uyst", DTZ, NEG(8)}, /* Uruguay Summer Time */
{"uyt", TZ, NEG(12)}, /* Uruguay Time */
{"uzst", DTZ, POS(24)}, /* Uzbekistan Summer Time */
{"uzt", TZ, POS(20)}, /* Uzbekistan Time */
{"vet", TZ, NEG(16)}, /* Venezuela Time */
{"vlast", DTZ, POS(44)}, /* Vladivostok Summer Time */
{"vlat", TZ, POS(40)}, /* Vladivostok Time */
#if 0
vust
#endif
{"vut", TZ, POS(44)}, /* Vanuata Time */
{"wadt", DTZ, POS(32)}, /* West Australian DST */
{"wakt", TZ, POS(48)}, /* Wake Time */
#if 0
warst
#endif
{"wast", TZ, POS(28)}, /* West Australian Std Time */
{"wat", TZ, NEG(4)}, /* West Africa Time */
{"wdt", DTZ, POS(36)}, /* West Australian DST */
{"wed", DOW, 3},
{"wednesday", DOW, 3},
{"weds", DOW, 3},
{"west", DTZ, POS(4)}, /* Western Europe Summer Time */
{"wet", TZ, POS(0)}, /* Western Europe */
{"wetdst", DTZ, POS(4)}, /* Western Europe Daylight Savings Time */
{"wft", TZ, POS(48)}, /* Wallis and Futuna Time */
{"wgst", DTZ, NEG(8)}, /* West Greenland Summer Time */
{"wgt", TZ, NEG(12)}, /* West Greenland Time */
{"wst", TZ, POS(32)}, /* West Australian Standard Time */
{"y", UNITS, DTK_YEAR}, /* "year" for ISO input */
{"yakst", DTZ, POS(40)}, /* Yakutsk Summer Time */
{"yakt", TZ, POS(36)}, /* Yakutsk Time */
{"yapt", TZ, POS(40)}, /* Yap Time (Micronesia) */
{"ydt", DTZ, NEG(32)}, /* Yukon Daylight Time */
{"yekst", DTZ, POS(24)}, /* Yekaterinburg Summer Time */
{"yekt", TZ, POS(20)}, /* Yekaterinburg Time */
{YESTERDAY, RESERV, DTK_YESTERDAY}, /* yesterday midnight */
{"yst", TZ, NEG(36)}, /* Yukon Standard Time */
{"z", TZ, POS(0)}, /* time zone tag per ISO-8601 */
{"zp4", TZ, NEG(16)}, /* UTC +4 hours. */
{"zp5", TZ, NEG(20)}, /* UTC +5 hours. */
{"zp6", TZ, NEG(24)}, /* UTC +6 hours. */
{ZULU, TZ, POS(0)}, /* UTC */
};
static unsigned int szdatetktbl = sizeof datetktbl / sizeof datetktbl[0];
/* Used for SET australian_timezones to override North American ones */
static datetkn australian_datetktbl[] = {
{"acst", TZ, POS(38)}, /* Cent. Australia */
{"cst", TZ, POS(42)}, /* Australia Central Std Time */
{"east", TZ, POS(40)}, /* East Australian Std Time */
{"est", TZ, POS(40)}, /* Australia Eastern Std Time */
{"sat", TZ, POS(38)},
};
static unsigned int australian_szdatetktbl = sizeof australian_datetktbl /
sizeof australian_datetktbl[0];
static datetkn deltatktbl[] = {
/* text, token, lexval */
{"@", IGNORE_DTF, 0}, /* postgres relative prefix */
{DAGO, AGO, 0}, /* "ago" indicates negative time offset */
{"c", UNITS, DTK_CENTURY}, /* "century" relative */
{"cent", UNITS, DTK_CENTURY}, /* "century" relative */
{"centuries", UNITS, DTK_CENTURY}, /* "centuries" relative */
{DCENTURY, UNITS, DTK_CENTURY}, /* "century" relative */
{"d", UNITS, DTK_DAY}, /* "day" relative */
{DDAY, UNITS, DTK_DAY}, /* "day" relative */
{"days", UNITS, DTK_DAY}, /* "days" relative */
{"dec", UNITS, DTK_DECADE}, /* "decade" relative */
{DDECADE, UNITS, DTK_DECADE}, /* "decade" relative */
{"decades", UNITS, DTK_DECADE}, /* "decades" relative */
{"decs", UNITS, DTK_DECADE}, /* "decades" relative */
{"h", UNITS, DTK_HOUR}, /* "hour" relative */
{DHOUR, UNITS, DTK_HOUR}, /* "hour" relative */
{"hours", UNITS, DTK_HOUR}, /* "hours" relative */
{"hr", UNITS, DTK_HOUR}, /* "hour" relative */
{"hrs", UNITS, DTK_HOUR}, /* "hours" relative */
{INVALID, RESERV, DTK_INVALID}, /* reserved for invalid time */
{"m", UNITS, DTK_MINUTE}, /* "minute" relative */
{"microsecon", UNITS, DTK_MICROSEC}, /* "microsecond" relative */
{"mil", UNITS, DTK_MILLENNIUM}, /* "millennium" relative */
{"millennia", UNITS, DTK_MILLENNIUM}, /* "millennia" relative */
{DMILLENNIUM, UNITS, DTK_MILLENNIUM}, /* "millennium" relative */
{"millisecon", UNITS, DTK_MILLISEC}, /* relative */
{"mils", UNITS, DTK_MILLENNIUM}, /* "millennia" relative */
{"min", UNITS, DTK_MINUTE}, /* "minute" relative */
{"mins", UNITS, DTK_MINUTE}, /* "minutes" relative */
{DMINUTE, UNITS, DTK_MINUTE}, /* "minute" relative */
{"minutes", UNITS, DTK_MINUTE}, /* "minutes" relative */
{"mon", UNITS, DTK_MONTH}, /* "months" relative */
{"mons", UNITS, DTK_MONTH}, /* "months" relative */
{DMONTH, UNITS, DTK_MONTH}, /* "month" relative */
{"months", UNITS, DTK_MONTH},
{"ms", UNITS, DTK_MILLISEC},
{"msec", UNITS, DTK_MILLISEC},
{DMILLISEC, UNITS, DTK_MILLISEC},
{"mseconds", UNITS, DTK_MILLISEC},
{"msecs", UNITS, DTK_MILLISEC},
{"qtr", UNITS, DTK_QUARTER}, /* "quarter" relative */
{DQUARTER, UNITS, DTK_QUARTER}, /* "quarter" relative */
{"reltime", IGNORE_DTF, 0}, /* pre-v6.1 "Undefined Reltime" */
{"s", UNITS, DTK_SECOND},
{"sec", UNITS, DTK_SECOND},
{DSECOND, UNITS, DTK_SECOND},
{"seconds", UNITS, DTK_SECOND},
{"secs", UNITS, DTK_SECOND},
{DTIMEZONE, UNITS, DTK_TZ}, /* "timezone" time offset */
{"timezone_h", UNITS, DTK_TZ_HOUR}, /* timezone hour units */
{"timezone_m", UNITS, DTK_TZ_MINUTE}, /* timezone minutes units */
{"undefined", RESERV, DTK_INVALID}, /* pre-v6.1 invalid time */
{"us", UNITS, DTK_MICROSEC}, /* "microsecond" relative */
{"usec", UNITS, DTK_MICROSEC}, /* "microsecond" relative */
{DMICROSEC, UNITS, DTK_MICROSEC}, /* "microsecond" relative */
{"useconds", UNITS, DTK_MICROSEC}, /* "microseconds" relative */
{"usecs", UNITS, DTK_MICROSEC}, /* "microseconds" relative */
{"w", UNITS, DTK_WEEK}, /* "week" relative */
{DWEEK, UNITS, DTK_WEEK}, /* "week" relative */
{"weeks", UNITS, DTK_WEEK}, /* "weeks" relative */
{"y", UNITS, DTK_YEAR}, /* "year" relative */
{DYEAR, UNITS, DTK_YEAR}, /* "year" relative */
{"years", UNITS, DTK_YEAR}, /* "years" relative */
{"yr", UNITS, DTK_YEAR}, /* "year" relative */
{"yrs", UNITS, DTK_YEAR}, /* "years" relative */
};
static unsigned int szdeltatktbl = sizeof deltatktbl / sizeof deltatktbl[0];
static datetkn *datecache[MAXDATEFIELDS] = {NULL};
static datetkn *deltacache[MAXDATEFIELDS] = {NULL};
/*
* Calendar time to Julian date conversions.
* Julian date is commonly used in astronomical applications,
* since it is numerically accurate and computationally simple.
* The algorithms here will accurately convert between Julian day
* and calendar date for all non-negative Julian days
* (i.e. from Nov 24, -4713 on).
*
* These routines will be used by other date/time packages
* - thomas 97/02/25
*
* Rewritten to eliminate overflow problems. This now allows the
* routines to work correctly for all Julian day counts from
* 0 to 2147483647 (Nov 24, -4713 to Jun 3, 5874898) assuming
* a 32-bit integer. Longer types should also work to the limits
* of their precision.
*/
int
date2j(int y, int m, int d)
{
int julian;
int century;
if (m > 2)
{
m += 1;
y += 4800;
}
else
{
m += 13;
y += 4799;
}
century = y / 100;
julian = y * 365 - 32167;
julian += y / 4 - century + century / 4;
julian += 7834 * m / 256 + d;
return julian;
} /* date2j() */
void
j2date(int jd, int *year, int *month, int *day)
{
unsigned int julian;
unsigned int quad;
unsigned int extra;
int y;
julian = jd;
julian += 32044;
quad = julian / 146097;
extra = (julian - quad * 146097) * 4 + 3;
julian += 60 + quad * 3 + extra / 146097;
quad = julian / 1461;
julian -= quad * 1461;
y = julian * 4 / 1461;
julian = ((y != 0) ? ((julian + 305) % 365) : ((julian + 306) % 366))
+ 123;
y += quad * 4;
*year = y - 4800;
quad = julian * 2141 / 65536;
*day = julian - 7834 * quad / 256;
*month = (quad + 10) % 12 + 1;
return;
} /* j2date() */
/*
* j2day - convert Julian date to day-of-week (0..6 == Sun..Sat)
*
* Note: various places use the locution j2day(date - 1) to produce a
* result according to the convention 0..6 = Mon..Sun. This is a bit of
* a crock, but will work as long as the computation here is just a modulo.
*/
int
j2day(int date)
{
unsigned int day;
day = date;
day += 1;
day %= 7;
return (int) day;
} /* j2day() */
/* TrimTrailingZeros()
* ... resulting from printing numbers with full precision.
*/
static void
TrimTrailingZeros(char *str)
{
int len = strlen(str);
#if 0
/* chop off trailing one to cope with interval rounding */
if (strcmp((str + len - 4), "0001") == 0)
{
len -= 4;
*(str + len) = '\0';
}
#endif
/* chop off trailing zeros... but leave at least 2 fractional digits */
while ((*(str + len - 1) == '0')
&& (*(str + len - 3) != '.'))
{
len--;
*(str + len) = '\0';
}
}
/* ParseDateTime()
* Break string into tokens based on a date/time context.
* Returns 0 if successful, DTERR code if bogus input detected.
*
* timestr - the input string
* lowstr - workspace for field string storage (must be large enough for
* a copy of the input string, including trailing null)
* field[] - pointers to field strings are returned in this array
* ftype[] - field type indicators are returned in this array
* maxfields - dimensions of the above two arrays
* *numfields - set to the actual number of fields detected
*
* The fields extracted from the input are stored as separate, null-terminated
* strings in the workspace at lowstr. Any text is converted to lower case.
*
* Several field types are assigned:
* DTK_NUMBER - digits and (possibly) a decimal point
* DTK_DATE - digits and two delimiters, or digits and text
* DTK_TIME - digits, colon delimiters, and possibly a decimal point
* DTK_STRING - text (no digits)
* DTK_SPECIAL - leading "+" or "-" followed by text
* DTK_TZ - leading "+" or "-" followed by digits
*
* Note that some field types can hold unexpected items:
* DTK_NUMBER can hold date fields (yy.ddd)
* DTK_STRING can hold months (January) and time zones (PST)
* DTK_DATE can hold Posix time zones (GMT-8)
*/
int
ParseDateTime(const char *timestr, char *lowstr,
char **field, int *ftype, int maxfields, int *numfields)
{
int nf = 0;
const char *cp = timestr;
char *lp = lowstr;
/* outer loop through fields */
while (*cp != '\0')
{
/* Ignore spaces between fields */
if (isspace((unsigned char) *cp))
{
cp++;
continue;
}
/* Record start of current field */
if (nf >= maxfields)
return DTERR_BAD_FORMAT;
field[nf] = lp;
/* leading digit? then date or time */
if (isdigit((unsigned char) *cp))
{
*lp++ = *cp++;
while (isdigit((unsigned char) *cp))
*lp++ = *cp++;
/* time field? */
if (*cp == ':')
{
ftype[nf] = DTK_TIME;
*lp++ = *cp++;
while (isdigit((unsigned char) *cp) ||
(*cp == ':') || (*cp == '.'))
*lp++ = *cp++;
}
/* date field? allow embedded text month */
else if ((*cp == '-') || (*cp == '/') || (*cp == '.'))
{
/* save delimiting character to use later */
char delim = *cp;
*lp++ = *cp++;
/* second field is all digits? then no embedded text month */
if (isdigit((unsigned char) *cp))
{
ftype[nf] = ((delim == '.') ? DTK_NUMBER : DTK_DATE);
while (isdigit((unsigned char) *cp))
*lp++ = *cp++;
/*
* insist that the delimiters match to get a
* three-field date.
*/
if (*cp == delim)
{
ftype[nf] = DTK_DATE;
*lp++ = *cp++;
while (isdigit((unsigned char) *cp) || (*cp == delim))
*lp++ = *cp++;
}
}
else
{
ftype[nf] = DTK_DATE;
while (isalnum((unsigned char) *cp) || (*cp == delim))
*lp++ = pg_tolower((unsigned char) *cp++);
}
}
/*
* otherwise, number only and will determine year, month, day,
* or concatenated fields later...
*/
else
ftype[nf] = DTK_NUMBER;
}
/* Leading decimal point? Then fractional seconds... */
else if (*cp == '.')
{
*lp++ = *cp++;
while (isdigit((unsigned char) *cp))
*lp++ = *cp++;
ftype[nf] = DTK_NUMBER;
}
/*
* text? then date string, month, day of week, special, or
* timezone
*/
else if (isalpha((unsigned char) *cp))
{
ftype[nf] = DTK_STRING;
*lp++ = pg_tolower((unsigned char) *cp++);
while (isalpha((unsigned char) *cp))
*lp++ = pg_tolower((unsigned char) *cp++);
/*
* Full date string with leading text month? Could also be a
* POSIX time zone...
*/
if ((*cp == '-') || (*cp == '/') || (*cp == '.'))
{
char delim = *cp;
ftype[nf] = DTK_DATE;
*lp++ = *cp++;
while (isdigit((unsigned char) *cp) || (*cp == delim))
*lp++ = *cp++;
}
}
/* sign? then special or numeric timezone */
else if ((*cp == '+') || (*cp == '-'))
{
*lp++ = *cp++;
/* soak up leading whitespace */
while (isspace((unsigned char) *cp))
cp++;
/* numeric timezone? */
if (isdigit((unsigned char) *cp))
{
ftype[nf] = DTK_TZ;
*lp++ = *cp++;
while (isdigit((unsigned char) *cp) ||
(*cp == ':') || (*cp == '.'))
*lp++ = *cp++;
}
/* special? */
else if (isalpha((unsigned char) *cp))
{
ftype[nf] = DTK_SPECIAL;
*lp++ = pg_tolower((unsigned char) *cp++);
while (isalpha((unsigned char) *cp))
*lp++ = pg_tolower((unsigned char) *cp++);
}
/* otherwise something wrong... */
else
return DTERR_BAD_FORMAT;
}
/* ignore other punctuation but use as delimiter */
else if (ispunct((unsigned char) *cp))
{
cp++;
continue;
}
/* otherwise, something is not right... */
else
return DTERR_BAD_FORMAT;
/* force in a delimiter after each field */
*lp++ = '\0';
nf++;
}
*numfields = nf;
return 0;
}
/* DecodeDateTime()
* Interpret previously parsed fields for general date and time.
* Return 0 if full date, 1 if only time, and negative DTERR code if problems.
* (Currently, all callers treat 1 as an error return too.)
*
* External format(s):
* "<weekday> <month>-<day>-<year> <hour>:<minute>:<second>"
* "Fri Feb-7-1997 15:23:27"
* "Feb-7-1997 15:23:27"
* "2-7-1997 15:23:27"
* "1997-2-7 15:23:27"
* "1997.038 15:23:27" (day of year 1-366)
* Also supports input in compact time:
* "970207 152327"
* "97038 152327"
* "20011225T040506.789-07"
*
* Use the system-provided functions to get the current time zone
* if not specified in the input string.
* If the date is outside the time_t system-supported time range,
* then assume UTC time zone. - thomas 1997-05-27
*/
int
DecodeDateTime(char **field, int *ftype, int nf,
int *dtype, struct pg_tm * tm, fsec_t *fsec, int *tzp)
{
int fmask = 0,
tmask,
type;
int ptype = 0; /* "prefix type" for ISO y2001m02d04
* format */
int i;
int val;
int dterr;
int mer = HR24;
bool haveTextMonth = FALSE;
int is2digits = FALSE;
int bc = FALSE;
/*
* We'll insist on at least all of the date fields, but initialize the
* remaining fields in case they are not set later...
*/
*dtype = DTK_DATE;
tm->tm_hour = 0;
tm->tm_min = 0;
tm->tm_sec = 0;
*fsec = 0;
/* don't know daylight savings time status apriori */
tm->tm_isdst = -1;
if (tzp != NULL)
*tzp = 0;
for (i = 0; i < nf; i++)
{
switch (ftype[i])
{
case DTK_DATE:
/***
* Integral julian day with attached time zone?
* All other forms with JD will be separated into
* distinct fields, so we handle just this case here.
***/
if (ptype == DTK_JULIAN)
{
char *cp;
int val;
if (tzp == NULL)
return DTERR_BAD_FORMAT;
val = strtol(field[i], &cp, 10);
j2date(val, &tm->tm_year, &tm->tm_mon, &tm->tm_mday);
/* Get the time zone from the end of the string */
dterr = DecodeTimezone(cp, tzp);
if (dterr)
return dterr;
tmask = DTK_DATE_M | DTK_TIME_M | DTK_M(TZ);
ptype = 0;
break;
}
/***
* Already have a date? Then this might be a POSIX time
* zone with an embedded dash (e.g. "PST-3" == "EST") or
* a run-together time with trailing time zone (e.g. hhmmss-zz).
* - thomas 2001-12-25
***/
else if (((fmask & DTK_DATE_M) == DTK_DATE_M)
|| (ptype != 0))
{
/* No time zone accepted? Then quit... */
if (tzp == NULL)
return DTERR_BAD_FORMAT;
if (isdigit((unsigned char) *field[i]) || ptype != 0)
{
char *cp;
if (ptype != 0)
{
/* Sanity check; should not fail this test */
if (ptype != DTK_TIME)
return DTERR_BAD_FORMAT;
ptype = 0;
}
/*
* Starts with a digit but we already have a time
* field? Then we are in trouble with a date and
* time already...
*/
if ((fmask & DTK_TIME_M) == DTK_TIME_M)
return DTERR_BAD_FORMAT;
if ((cp = strchr(field[i], '-')) == NULL)
return DTERR_BAD_FORMAT;
/* Get the time zone from the end of the string */
dterr = DecodeTimezone(cp, tzp);
if (dterr)
return dterr;
*cp = '\0';
/*
* Then read the rest of the field as a
* concatenated time
*/
dterr = DecodeNumberField(strlen(field[i]), field[i],
fmask,
&tmask, tm,
fsec, &is2digits);
if (dterr < 0)
return dterr;
ftype[i] = dterr;
/*
* modify tmask after returning from
* DecodeNumberField()
*/
tmask |= DTK_M(TZ);
}
else
{
dterr = DecodePosixTimezone(field[i], tzp);
if (dterr)
return dterr;
ftype[i] = DTK_TZ;
tmask = DTK_M(TZ);
}
}
else
{
dterr = DecodeDate(field[i], fmask, &tmask, tm);
if (dterr)
return dterr;
}
break;
case DTK_TIME:
dterr = DecodeTime(field[i], fmask, &tmask, tm, fsec);
if (dterr)
return dterr;
/*
* Check upper limit on hours; other limits checked in
* DecodeTime()
*/
if (tm->tm_hour > 23)
return DTERR_FIELD_OVERFLOW;
break;
case DTK_TZ:
{
int tz;
if (tzp == NULL)
return DTERR_BAD_FORMAT;
dterr = DecodeTimezone(field[i], &tz);
if (dterr)
return dterr;
/*
* Already have a time zone? Then maybe this is the
* second field of a POSIX time: EST+3 (equivalent to
* PST)
*/
if ((i > 0) && ((fmask & DTK_M(TZ)) != 0)
&& (ftype[i - 1] == DTK_TZ)
&& (isalpha((unsigned char) *field[i - 1])))
{
*tzp -= tz;
tmask = 0;
}
else
{
*tzp = tz;
tmask = DTK_M(TZ);
}
}
break;
case DTK_NUMBER:
/*
* Was this an "ISO date" with embedded field labels? An
* example is "y2001m02d04" - thomas 2001-02-04
*/
if (ptype != 0)
{
char *cp;
int val;
val = strtol(field[i], &cp, 10);
/*
* only a few kinds are allowed to have an embedded
* decimal
*/
if (*cp == '.')
switch (ptype)
{
case DTK_JULIAN:
case DTK_TIME:
case DTK_SECOND:
break;
default:
return DTERR_BAD_FORMAT;
break;
}
else if (*cp != '\0')
return DTERR_BAD_FORMAT;
switch (ptype)
{
case DTK_YEAR:
tm->tm_year = val;
tmask = DTK_M(YEAR);
break;
case DTK_MONTH:
/*
* already have a month and hour? then assume
* minutes
*/
if (((fmask & DTK_M(MONTH)) != 0)
&& ((fmask & DTK_M(HOUR)) != 0))
{
tm->tm_min = val;
tmask = DTK_M(MINUTE);
}
else
{
tm->tm_mon = val;
tmask = DTK_M(MONTH);
}
break;
case DTK_DAY:
tm->tm_mday = val;
tmask = DTK_M(DAY);
break;
case DTK_HOUR:
tm->tm_hour = val;
tmask = DTK_M(HOUR);
break;
case DTK_MINUTE:
tm->tm_min = val;
tmask = DTK_M(MINUTE);
break;
case DTK_SECOND:
tm->tm_sec = val;
tmask = DTK_M(SECOND);
if (*cp == '.')
{
double frac;
frac = strtod(cp, &cp);
if (*cp != '\0')
return DTERR_BAD_FORMAT;
#ifdef HAVE_INT64_TIMESTAMP
*fsec = rint(frac * 1000000);
#else
*fsec = frac;
#endif
}
break;
case DTK_TZ:
tmask = DTK_M(TZ);
dterr = DecodeTimezone(field[i], tzp);
if (dterr)
return dterr;
break;
case DTK_JULIAN:
/***
* previous field was a label for "julian date"?
***/
tmask = DTK_DATE_M;
j2date(val, &tm->tm_year, &tm->tm_mon, &tm->tm_mday);
/* fractional Julian Day? */
if (*cp == '.')
{
double time;
time = strtod(cp, &cp);
if (*cp != '\0')
return DTERR_BAD_FORMAT;
tmask |= DTK_TIME_M;
#ifdef HAVE_INT64_TIMESTAMP
dt2time((time * 86400000000),
&tm->tm_hour, &tm->tm_min, &tm->tm_sec, fsec);
#else
dt2time((time * 86400),
&tm->tm_hour, &tm->tm_min, &tm->tm_sec, fsec);
#endif
}
break;
case DTK_TIME:
/* previous field was "t" for ISO time */
dterr = DecodeNumberField(strlen(field[i]), field[i],
(fmask | DTK_DATE_M),
&tmask, tm,
fsec, &is2digits);
if (dterr < 0)
return dterr;
ftype[i] = dterr;
if (tmask != DTK_TIME_M)
return DTERR_BAD_FORMAT;
break;
default:
return DTERR_BAD_FORMAT;
break;
}
ptype = 0;
*dtype = DTK_DATE;
}
else
{
char *cp;
int flen;
flen = strlen(field[i]);
cp = strchr(field[i], '.');
/* Embedded decimal and no date yet? */
if ((cp != NULL) && !(fmask & DTK_DATE_M))
{
dterr = DecodeDate(field[i], fmask, &tmask, tm);
if (dterr)
return dterr;
}
/* embedded decimal and several digits before? */
else if ((cp != NULL) && ((flen - strlen(cp)) > 2))
{
/*
* Interpret as a concatenated date or time Set
* the type field to allow decoding other fields
* later. Example: 20011223 or 040506
*/
dterr = DecodeNumberField(flen, field[i], fmask,
&tmask, tm,
fsec, &is2digits);
if (dterr < 0)
return dterr;
ftype[i] = dterr;
}
else if (flen > 4)
{
dterr = DecodeNumberField(flen, field[i], fmask,
&tmask, tm,
fsec, &is2digits);
if (dterr < 0)
return dterr;
ftype[i] = dterr;
}
/* otherwise it is a single date/time field... */
else
{
dterr = DecodeNumber(flen, field[i],
haveTextMonth, fmask,
&tmask, tm,
fsec, &is2digits);
if (dterr)
return dterr;
}
}
break;
case DTK_STRING:
case DTK_SPECIAL:
type = DecodeSpecial(i, field[i], &val);
if (type == IGNORE_DTF)
continue;
tmask = DTK_M(type);
switch (type)
{
case RESERV:
switch (val)
{
case DTK_CURRENT:
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("date/time value \"current\" is no longer supported")));
return DTERR_BAD_FORMAT;
break;
case DTK_NOW:
tmask = (DTK_DATE_M | DTK_TIME_M | DTK_M(TZ));
*dtype = DTK_DATE;
GetCurrentTimeUsec(tm, fsec, tzp);
break;
case DTK_YESTERDAY:
tmask = DTK_DATE_M;
*dtype = DTK_DATE;
GetCurrentDateTime(tm);
j2date((date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - 1),
&tm->tm_year, &tm->tm_mon, &tm->tm_mday);
tm->tm_hour = 0;
tm->tm_min = 0;
tm->tm_sec = 0;
break;
case DTK_TODAY:
tmask = DTK_DATE_M;
*dtype = DTK_DATE;
GetCurrentDateTime(tm);
tm->tm_hour = 0;
tm->tm_min = 0;
tm->tm_sec = 0;
break;
case DTK_TOMORROW:
tmask = DTK_DATE_M;
*dtype = DTK_DATE;
GetCurrentDateTime(tm);
j2date((date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) + 1),
&tm->tm_year, &tm->tm_mon, &tm->tm_mday);
tm->tm_hour = 0;
tm->tm_min = 0;
tm->tm_sec = 0;
break;
case DTK_ZULU:
tmask = (DTK_TIME_M | DTK_M(TZ));
*dtype = DTK_DATE;
tm->tm_hour = 0;
tm->tm_min = 0;
tm->tm_sec = 0;
if (tzp != NULL)
*tzp = 0;
break;
default:
*dtype = val;
}
break;
case MONTH:
/*
* already have a (numeric) month? then see if we
* can substitute...
*/
if ((fmask & DTK_M(MONTH)) && (!haveTextMonth)
&& (!(fmask & DTK_M(DAY)))
&& ((tm->tm_mon >= 1) && (tm->tm_mon <= 31)))
{
tm->tm_mday = tm->tm_mon;
tmask = DTK_M(DAY);
}
haveTextMonth = TRUE;
tm->tm_mon = val;
break;
case DTZMOD:
/*
* daylight savings time modifier (solves "MET
* DST" syntax)
*/
tmask |= DTK_M(DTZ);
tm->tm_isdst = 1;
if (tzp == NULL)
return DTERR_BAD_FORMAT;
*tzp += val * 60;
break;
case DTZ:
/*
* set mask for TZ here _or_ check for DTZ later
* when getting default timezone
*/
tmask |= DTK_M(TZ);
tm->tm_isdst = 1;
if (tzp == NULL)
return DTERR_BAD_FORMAT;
*tzp = val * 60;
ftype[i] = DTK_TZ;
break;
case TZ:
tm->tm_isdst = 0;
if (tzp == NULL)
return DTERR_BAD_FORMAT;
*tzp = val * 60;
ftype[i] = DTK_TZ;
break;
case IGNORE_DTF:
break;
case AMPM:
mer = val;
break;
case ADBC:
bc = (val == BC);
break;
case DOW:
tm->tm_wday = val;
break;
case UNITS:
tmask = 0;
ptype = val;
break;
case ISOTIME:
/*
* This is a filler field "t" indicating that the
* next field is time. Try to verify that this is
* sensible.
*/
tmask = 0;
/* No preceding date? Then quit... */
if ((fmask & DTK_DATE_M) != DTK_DATE_M)
return DTERR_BAD_FORMAT;
/***
* We will need one of the following fields:
* DTK_NUMBER should be hhmmss.fff
* DTK_TIME should be hh:mm:ss.fff
* DTK_DATE should be hhmmss-zz
***/
if ((i >= (nf - 1))
|| ((ftype[i + 1] != DTK_NUMBER)
&& (ftype[i + 1] != DTK_TIME)
&& (ftype[i + 1] != DTK_DATE)))
return DTERR_BAD_FORMAT;
ptype = val;
break;
default:
return DTERR_BAD_FORMAT;
}
break;
default:
return DTERR_BAD_FORMAT;
}
if (tmask & fmask)
return DTERR_BAD_FORMAT;
fmask |= tmask;
}
if (fmask & DTK_M(YEAR))
{
/* there is no year zero in AD/BC notation; i.e. "1 BC" == year 0 */
if (bc)
{
if (tm->tm_year > 0)
tm->tm_year = -(tm->tm_year - 1);
else
ereport(ERROR,
(errcode(ERRCODE_INVALID_DATETIME_FORMAT),
errmsg("inconsistent use of year %04d and \"BC\"",
tm->tm_year)));
}
else if (is2digits)
{
if (tm->tm_year < 70)
tm->tm_year += 2000;
else if (tm->tm_year < 100)
tm->tm_year += 1900;
}
}
/* now that we have correct year, decode DOY */
if (fmask & DTK_M(DOY))
{
j2date(date2j(tm->tm_year, 1, 1) + tm->tm_yday - 1,
&tm->tm_year, &tm->tm_mon, &tm->tm_mday);
}
/* check for valid month */
if (fmask & DTK_M(MONTH))
{
if (tm->tm_mon < 1 || tm->tm_mon > 12)
return DTERR_MD_FIELD_OVERFLOW;
}
/* minimal check for valid day */
if (fmask & DTK_M(DAY))
{
if (tm->tm_mday < 1 || tm->tm_mday > 31)
return DTERR_MD_FIELD_OVERFLOW;
}
if ((mer != HR24) && (tm->tm_hour > 12))
return DTERR_FIELD_OVERFLOW;
if ((mer == AM) && (tm->tm_hour == 12))
tm->tm_hour = 0;
else if ((mer == PM) && (tm->tm_hour != 12))
tm->tm_hour += 12;
/* do additional checking for full date specs... */
if (*dtype == DTK_DATE)
{
if ((fmask & DTK_DATE_M) != DTK_DATE_M)
{
if ((fmask & DTK_TIME_M) == DTK_TIME_M)
return 1;
return DTERR_BAD_FORMAT;
}
/*
* Check for valid day of month, now that we know for sure the
* month and year. Note we don't use MD_FIELD_OVERFLOW here,
* since it seems unlikely that "Feb 29" is a YMD-order error.
*/
if (tm->tm_mday > day_tab[isleap(tm->tm_year)][tm->tm_mon - 1])
return DTERR_FIELD_OVERFLOW;
/* timezone not specified? then find local timezone if possible */
if ((tzp != NULL) && (!(fmask & DTK_M(TZ))))
{
/*
* daylight savings time modifier but no standard timezone?
* then error
*/
if (fmask & DTK_M(DTZMOD))
return DTERR_BAD_FORMAT;
*tzp = DetermineLocalTimeZone(tm);
}
}
return 0;
}
/* DetermineLocalTimeZone()
*
* Given a struct pg_tm in which tm_year, tm_mon, tm_mday, tm_hour, tm_min, and
* tm_sec fields are set, attempt to determine the applicable local zone
* (ie, regular or daylight-savings time) at that time. Set the struct pg_tm's
* tm_isdst field accordingly, and return the actual timezone offset.
*
* Note: this subroutine exists because mktime() has such a spectacular
* variety of, ahem, odd behaviors on various platforms. We used to try to
* use mktime() here, but finally gave it up as a bad job. Avoid using
* mktime() anywhere else.
*/
int
DetermineLocalTimeZone(struct pg_tm * tm)
{
int tz;
if (HasCTZSet)
{
tm->tm_isdst = 0; /* for lack of a better idea */
tz = CTimeZone;
}
else if (IS_VALID_UTIME(tm->tm_year, tm->tm_mon, tm->tm_mday))
{
/*
* First, generate the time_t value corresponding to the given
* y/m/d/h/m/s taken as GMT time. This will not overflow (at
* least not for time_t taken as signed) because of the range
* check we did above.
*/
long day,
mysec,
locsec,
delta1,
delta2;
time_t mytime;
struct pg_tm *tx;
day = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - UNIX_EPOCH_JDATE;
mysec = tm->tm_sec + (tm->tm_min + (day * 24 + tm->tm_hour) * 60) * 60;
mytime = (time_t) mysec;
/*
* Use localtime to convert that time_t to broken-down time,
* and reassemble to get a representation of local time.
*/
tx = pg_localtime(&mytime);
if (!tx)
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("timestamp out of range")));
day = date2j(tx->tm_year + 1900, tx->tm_mon + 1, tx->tm_mday) -
UNIX_EPOCH_JDATE;
locsec = tx->tm_sec + (tx->tm_min + (day * 24 + tx->tm_hour) * 60) * 60;
/*
* The local time offset corresponding to that GMT time is now
* computable as mysec - locsec.
*/
delta1 = mysec - locsec;
/*
* However, if that GMT time and the local time we are
* actually interested in are on opposite sides of a
* daylight-savings-time transition, then this is not the time
* offset we want. So, adjust the time_t to be what we think
* the GMT time corresponding to our target local time is, and
* repeat the localtime() call and delta calculation.
*/
mysec += delta1;
mytime = (time_t) mysec;
tx = pg_localtime(&mytime);
if (!tx)
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("timestamp out of range")));
day = date2j(tx->tm_year + 1900, tx->tm_mon + 1, tx->tm_mday) -
UNIX_EPOCH_JDATE;
locsec = tx->tm_sec + (tx->tm_min + (day * 24 + tx->tm_hour) * 60) * 60;
delta2 = mysec - locsec;
/*
* We may have to do it again to get the correct delta.
*
* It might seem we should just loop until we get the same delta
* twice in a row, but if we've been given an "impossible" local
* time (in the gap during a spring-forward transition) we'd never
* get out of the loop. The behavior we want is that "impossible"
* times are taken as standard time, and also that ambiguous times
* (during a fall-back transition) are taken as standard time.
* Therefore, we bias the code to prefer the standard-time solution.
*/
if (delta2 != delta1 && tx->tm_isdst != 0)
{
mysec += (delta2 - delta1);
mytime = (time_t) mysec;
tx = pg_localtime(&mytime);
if (!tx)
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("timestamp out of range")));
day = date2j(tx->tm_year + 1900, tx->tm_mon + 1, tx->tm_mday) -
UNIX_EPOCH_JDATE;
locsec = tx->tm_sec + (tx->tm_min + (day * 24 + tx->tm_hour) * 60) * 60;
delta2 = mysec - locsec;
}
tm->tm_isdst = tx->tm_isdst;
tz = (int) delta2;
}
else
{
/* Given date is out of range, so assume UTC */
tm->tm_isdst = 0;
tz = 0;
}
return tz;
}
/* DecodeTimeOnly()
* Interpret parsed string as time fields only.
* Returns 0 if successful, DTERR code if bogus input detected.
*
* Note that support for time zone is here for
* SQL92 TIME WITH TIME ZONE, but it reveals
* bogosity with SQL92 date/time standards, since
* we must infer a time zone from current time.
* - thomas 2000-03-10
* Allow specifying date to get a better time zone,
* if time zones are allowed. - thomas 2001-12-26
*/
int
DecodeTimeOnly(char **field, int *ftype, int nf,
int *dtype, struct pg_tm * tm, fsec_t *fsec, int *tzp)
{
int fmask = 0,
tmask,
type;
int ptype = 0; /* "prefix type" for ISO h04mm05s06 format */
int i;
int val;
int dterr;
int is2digits = FALSE;
int mer = HR24;
*dtype = DTK_TIME;
tm->tm_hour = 0;
tm->tm_min = 0;
tm->tm_sec = 0;
*fsec = 0;
/* don't know daylight savings time status apriori */
tm->tm_isdst = -1;
if (tzp != NULL)
*tzp = 0;
for (i = 0; i < nf; i++)
{
switch (ftype[i])
{
case DTK_DATE:
/*
* Time zone not allowed? Then should not accept dates or
* time zones no matter what else!
*/
if (tzp == NULL)
return DTERR_BAD_FORMAT;
/* Under limited circumstances, we will accept a date... */
if ((i == 0) && (nf >= 2)
&& ((ftype[nf - 1] == DTK_DATE)
|| (ftype[1] == DTK_TIME)))
{
dterr = DecodeDate(field[i], fmask, &tmask, tm);
if (dterr)
return dterr;
}
/* otherwise, this is a time and/or time zone */
else
{
if (isdigit((unsigned char) *field[i]))
{
char *cp;
/*
* Starts with a digit but we already have a time
* field? Then we are in trouble with time
* already...
*/
if ((fmask & DTK_TIME_M) == DTK_TIME_M)
return DTERR_BAD_FORMAT;
/*
* Should not get here and fail. Sanity check
* only...
*/
if ((cp = strchr(field[i], '-')) == NULL)
return DTERR_BAD_FORMAT;
/* Get the time zone from the end of the string */
dterr = DecodeTimezone(cp, tzp);
if (dterr)
return dterr;
*cp = '\0';
/*
* Then read the rest of the field as a
* concatenated time
*/
dterr = DecodeNumberField(strlen(field[i]), field[i],
(fmask | DTK_DATE_M),
&tmask, tm,
fsec, &is2digits);
if (dterr < 0)
return dterr;
ftype[i] = dterr;
tmask |= DTK_M(TZ);
}
else
{
dterr = DecodePosixTimezone(field[i], tzp);
if (dterr)
return dterr;
ftype[i] = DTK_TZ;
tmask = DTK_M(TZ);
}
}
break;
case DTK_TIME:
dterr = DecodeTime(field[i], (fmask | DTK_DATE_M),
&tmask, tm, fsec);
if (dterr)
return dterr;
break;
case DTK_TZ:
{
int tz;
if (tzp == NULL)
return DTERR_BAD_FORMAT;
dterr = DecodeTimezone(field[i], &tz);
if (dterr)
return dterr;
/*
* Already have a time zone? Then maybe this is the
* second field of a POSIX time: EST+3 (equivalent to
* PST)
*/
if ((i > 0) && ((fmask & DTK_M(TZ)) != 0)
&& (ftype[i - 1] == DTK_TZ) && (isalpha((unsigned char) *field[i - 1])))
{
*tzp -= tz;
tmask = 0;
}
else
{
*tzp = tz;
tmask = DTK_M(TZ);
}
}
break;
case DTK_NUMBER:
/*
* Was this an "ISO time" with embedded field labels? An
* example is "h04m05s06" - thomas 2001-02-04
*/
if (ptype != 0)
{
char *cp;
int val;
/* Only accept a date under limited circumstances */
switch (ptype)
{
case DTK_JULIAN:
case DTK_YEAR:
case DTK_MONTH:
case DTK_DAY:
if (tzp == NULL)
return DTERR_BAD_FORMAT;
default:
break;
}
val = strtol(field[i], &cp, 10);
/*
* only a few kinds are allowed to have an embedded
* decimal
*/
if (*cp == '.')
switch (ptype)
{
case DTK_JULIAN:
case DTK_TIME:
case DTK_SECOND:
break;
default:
return DTERR_BAD_FORMAT;
break;
}
else if (*cp != '\0')
return DTERR_BAD_FORMAT;
switch (ptype)
{
case DTK_YEAR:
tm->tm_year = val;
tmask = DTK_M(YEAR);
break;
case DTK_MONTH:
/*
* already have a month and hour? then assume
* minutes
*/
if (((fmask & DTK_M(MONTH)) != 0)
&& ((fmask & DTK_M(HOUR)) != 0))
{
tm->tm_min = val;
tmask = DTK_M(MINUTE);
}
else
{
tm->tm_mon = val;
tmask = DTK_M(MONTH);
}
break;
case DTK_DAY:
tm->tm_mday = val;
tmask = DTK_M(DAY);
break;
case DTK_HOUR:
tm->tm_hour = val;
tmask = DTK_M(HOUR);
break;
case DTK_MINUTE:
tm->tm_min = val;
tmask = DTK_M(MINUTE);
break;
case DTK_SECOND:
tm->tm_sec = val;
tmask = DTK_M(SECOND);
if (*cp == '.')
{
double frac;
frac = strtod(cp, &cp);
if (*cp != '\0')
return DTERR_BAD_FORMAT;
#ifdef HAVE_INT64_TIMESTAMP
*fsec = rint(frac * 1000000);
#else
*fsec = frac;
#endif
}
break;
case DTK_TZ:
tmask = DTK_M(TZ);
dterr = DecodeTimezone(field[i], tzp);
if (dterr)
return dterr;
break;
case DTK_JULIAN:
/***
* previous field was a label for "julian date"?
***/
tmask = DTK_DATE_M;
j2date(val, &tm->tm_year, &tm->tm_mon, &tm->tm_mday);
if (*cp == '.')
{
double time;
time = strtod(cp, &cp);
if (*cp != '\0')
return DTERR_BAD_FORMAT;
tmask |= DTK_TIME_M;
#ifdef HAVE_INT64_TIMESTAMP
dt2time((time * 86400000000),
&tm->tm_hour, &tm->tm_min, &tm->tm_sec, fsec);
#else
dt2time((time * 86400),
&tm->tm_hour, &tm->tm_min, &tm->tm_sec, fsec);
#endif
}
break;
case DTK_TIME:
/* previous field was "t" for ISO time */
dterr = DecodeNumberField(strlen(field[i]), field[i],
(fmask | DTK_DATE_M),
&tmask, tm,
fsec, &is2digits);
if (dterr < 0)
return dterr;
ftype[i] = dterr;
if (tmask != DTK_TIME_M)
return DTERR_BAD_FORMAT;
break;
default:
return DTERR_BAD_FORMAT;
break;
}
ptype = 0;
*dtype = DTK_DATE;
}
else
{
char *cp;
int flen;
flen = strlen(field[i]);
cp = strchr(field[i], '.');
/* Embedded decimal? */
if (cp != NULL)
{
/*
* Under limited circumstances, we will accept a
* date...
*/
if ((i == 0) && ((nf >= 2) && (ftype[nf - 1] == DTK_DATE)))
{
dterr = DecodeDate(field[i], fmask, &tmask, tm);
if (dterr)
return dterr;
}
/* embedded decimal and several digits before? */
else if ((flen - strlen(cp)) > 2)
{
/*
* Interpret as a concatenated date or time
* Set the type field to allow decoding other
* fields later. Example: 20011223 or 040506
*/
dterr = DecodeNumberField(flen, field[i],
(fmask | DTK_DATE_M),
&tmask, tm,
fsec, &is2digits);
if (dterr < 0)
return dterr;
ftype[i] = dterr;
}
else
return DTERR_BAD_FORMAT;
}
else if (flen > 4)
{
dterr = DecodeNumberField(flen, field[i],
(fmask | DTK_DATE_M),
&tmask, tm,
fsec, &is2digits);
if (dterr < 0)
return dterr;
ftype[i] = dterr;
}
/* otherwise it is a single date/time field... */
else
{
dterr = DecodeNumber(flen, field[i],
FALSE,
(fmask | DTK_DATE_M),
&tmask, tm,
fsec, &is2digits);
if (dterr)
return dterr;
}
}
break;
case DTK_STRING:
case DTK_SPECIAL:
type = DecodeSpecial(i, field[i], &val);
if (type == IGNORE_DTF)
continue;
tmask = DTK_M(type);
switch (type)
{
case RESERV:
switch (val)
{
case DTK_CURRENT:
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("date/time value \"current\" is no longer supported")));
return DTERR_BAD_FORMAT;
break;
case DTK_NOW:
tmask = DTK_TIME_M;
*dtype = DTK_TIME;
GetCurrentTimeUsec(tm, fsec, NULL);
break;
case DTK_ZULU:
tmask = (DTK_TIME_M | DTK_M(TZ));
*dtype = DTK_TIME;
tm->tm_hour = 0;
tm->tm_min = 0;
tm->tm_sec = 0;
tm->tm_isdst = 0;
break;
default:
return DTERR_BAD_FORMAT;
}
break;
case DTZMOD:
/*
* daylight savings time modifier (solves "MET
* DST" syntax)
*/
tmask |= DTK_M(DTZ);
tm->tm_isdst = 1;
if (tzp == NULL)
return DTERR_BAD_FORMAT;
*tzp += val * 60;
break;
case DTZ:
/*
* set mask for TZ here _or_ check for DTZ later
* when getting default timezone
*/
tmask |= DTK_M(TZ);
tm->tm_isdst = 1;
if (tzp == NULL)
return DTERR_BAD_FORMAT;
*tzp = val * 60;
ftype[i] = DTK_TZ;
break;
case TZ:
tm->tm_isdst = 0;
if (tzp == NULL)
return DTERR_BAD_FORMAT;
*tzp = val * 60;
ftype[i] = DTK_TZ;
break;
case IGNORE_DTF:
break;
case AMPM:
mer = val;
break;
case UNITS:
tmask = 0;
ptype = val;
break;
case ISOTIME:
tmask = 0;
/***
* We will need one of the following fields:
* DTK_NUMBER should be hhmmss.fff
* DTK_TIME should be hh:mm:ss.fff
* DTK_DATE should be hhmmss-zz
***/
if ((i >= (nf - 1))
|| ((ftype[i + 1] != DTK_NUMBER)
&& (ftype[i + 1] != DTK_TIME)
&& (ftype[i + 1] != DTK_DATE)))
return DTERR_BAD_FORMAT;
ptype = val;
break;
default:
return DTERR_BAD_FORMAT;
}
break;
default:
return DTERR_BAD_FORMAT;
}
if (tmask & fmask)
return DTERR_BAD_FORMAT;
fmask |= tmask;
}
if ((mer != HR24) && (tm->tm_hour > 12))
return DTERR_FIELD_OVERFLOW;
if ((mer == AM) && (tm->tm_hour == 12))
tm->tm_hour = 0;
else if ((mer == PM) && (tm->tm_hour != 12))
tm->tm_hour += 12;
#ifdef HAVE_INT64_TIMESTAMP
if ((tm->tm_hour < 0) || (tm->tm_hour > 23)
|| (tm->tm_min < 0) || (tm->tm_min > 59)
|| (tm->tm_sec < 0) || (tm->tm_sec > 60)
|| (*fsec < INT64CONST(0)) || (*fsec >= INT64CONST(1000000)))
return DTERR_FIELD_OVERFLOW;
#else
if ((tm->tm_hour < 0) || (tm->tm_hour > 23)
|| (tm->tm_min < 0) || (tm->tm_min > 59)
|| (tm->tm_sec < 0) || (tm->tm_sec > 60)
|| (*fsec < 0) || (*fsec >= 1))
return DTERR_FIELD_OVERFLOW;
#endif
if ((fmask & DTK_TIME_M) != DTK_TIME_M)
return DTERR_BAD_FORMAT;
/* timezone not specified? then find local timezone if possible */
if ((tzp != NULL) && (!(fmask & DTK_M(TZ))))
{
struct pg_tm tt,
*tmp = &tt;
/*
* daylight savings time modifier but no standard timezone? then
* error
*/
if (fmask & DTK_M(DTZMOD))
return DTERR_BAD_FORMAT;
if ((fmask & DTK_DATE_M) == 0)
GetCurrentDateTime(tmp);
else
{
tmp->tm_year = tm->tm_year;
tmp->tm_mon = tm->tm_mon;
tmp->tm_mday = tm->tm_mday;
}
tmp->tm_hour = tm->tm_hour;
tmp->tm_min = tm->tm_min;
tmp->tm_sec = tm->tm_sec;
*tzp = DetermineLocalTimeZone(tmp);
tm->tm_isdst = tmp->tm_isdst;
}
return 0;
}
/* DecodeDate()
* Decode date string which includes delimiters.
* Return 0 if okay, a DTERR code if not.
*
* Insist on a complete set of fields.
*/
static int
DecodeDate(char *str, int fmask, int *tmask, struct pg_tm * tm)
{
fsec_t fsec;
int nf = 0;
int i,
len;
int dterr;
bool haveTextMonth = FALSE;
int bc = FALSE;
int is2digits = FALSE;
int type,
val,
dmask = 0;
char *field[MAXDATEFIELDS];
/* parse this string... */
while ((*str != '\0') && (nf < MAXDATEFIELDS))
{
/* skip field separators */
while (!isalnum((unsigned char) *str))
str++;
field[nf] = str;
if (isdigit((unsigned char) *str))
{
while (isdigit((unsigned char) *str))
str++;
}
else if (isalpha((unsigned char) *str))
{
while (isalpha((unsigned char) *str))
str++;
}
/* Just get rid of any non-digit, non-alpha characters... */
if (*str != '\0')
*str++ = '\0';
nf++;
}
#if 0
/* don't allow too many fields */
if (nf > 3)
return DTERR_BAD_FORMAT;
#endif
*tmask = 0;
/* look first for text fields, since that will be unambiguous month */
for (i = 0; i < nf; i++)
{
if (isalpha((unsigned char) *field[i]))
{
type = DecodeSpecial(i, field[i], &val);
if (type == IGNORE_DTF)
continue;
dmask = DTK_M(type);
switch (type)
{
case MONTH:
tm->tm_mon = val;
haveTextMonth = TRUE;
break;
case ADBC:
bc = (val == BC);
break;
default:
return DTERR_BAD_FORMAT;
}
if (fmask & dmask)
return DTERR_BAD_FORMAT;
fmask |= dmask;
*tmask |= dmask;
/* mark this field as being completed */
field[i] = NULL;
}
}
/* now pick up remaining numeric fields */
for (i = 0; i < nf; i++)
{
if (field[i] == NULL)
continue;
if ((len = strlen(field[i])) <= 0)
return DTERR_BAD_FORMAT;
dterr = DecodeNumber(len, field[i], haveTextMonth, fmask,
&dmask, tm,
&fsec, &is2digits);
if (dterr)
return dterr;
if (fmask & dmask)
return DTERR_BAD_FORMAT;
fmask |= dmask;
*tmask |= dmask;
}
if ((fmask & ~(DTK_M(DOY) | DTK_M(TZ))) != DTK_DATE_M)
return DTERR_BAD_FORMAT;
/* there is no year zero in AD/BC notation; i.e. "1 BC" == year 0 */
if (bc)
{
if (tm->tm_year > 0)
tm->tm_year = -(tm->tm_year - 1);
else
ereport(ERROR,
(errcode(ERRCODE_INVALID_DATETIME_FORMAT),
errmsg("inconsistent use of year %04d and \"BC\"",
tm->tm_year)));
}
else if (is2digits)
{
if (tm->tm_year < 70)
tm->tm_year += 2000;
else if (tm->tm_year < 100)
tm->tm_year += 1900;
}
/* now that we have correct year, decode DOY */
if (fmask & DTK_M(DOY))
{
j2date(date2j(tm->tm_year, 1, 1) + tm->tm_yday - 1,
&tm->tm_year, &tm->tm_mon, &tm->tm_mday);
}
/* check for valid month */
if (tm->tm_mon < 1 || tm->tm_mon > 12)
return DTERR_MD_FIELD_OVERFLOW;
/* check for valid day */
if (tm->tm_mday < 1 || tm->tm_mday > 31)
return DTERR_MD_FIELD_OVERFLOW;
/* We don't want to hint about DateStyle for Feb 29 */
if (tm->tm_mday > day_tab[isleap(tm->tm_year)][tm->tm_mon - 1])
return DTERR_FIELD_OVERFLOW;
return 0;
}
/* DecodeTime()
* Decode time string which includes delimiters.
* Return 0 if okay, a DTERR code if not.
*
* Only check the lower limit on hours, since this same code
* can be used to represent time spans.
*/
static int
DecodeTime(char *str, int fmask, int *tmask, struct pg_tm * tm, fsec_t *fsec)
{
char *cp;
*tmask = DTK_TIME_M;
tm->tm_hour = strtol(str, &cp, 10);
if (*cp != ':')
return DTERR_BAD_FORMAT;
str = cp + 1;
tm->tm_min = strtol(str, &cp, 10);
if (*cp == '\0')
{
tm->tm_sec = 0;
*fsec = 0;
}
else if (*cp != ':')
return DTERR_BAD_FORMAT;
else
{
str = cp + 1;
tm->tm_sec = strtol(str, &cp, 10);
if (*cp == '\0')
*fsec = 0;
else if (*cp == '.')
{
double frac;
str = cp;
frac = strtod(str, &cp);
if (*cp != '\0')
return DTERR_BAD_FORMAT;
#ifdef HAVE_INT64_TIMESTAMP
*fsec = rint(frac * 1000000);
#else
*fsec = frac;
#endif
}
else
return DTERR_BAD_FORMAT;
}
/* do a sanity check */
#ifdef HAVE_INT64_TIMESTAMP
if ((tm->tm_hour < 0)
|| (tm->tm_min < 0) || (tm->tm_min > 59)
|| (tm->tm_sec < 0) || (tm->tm_sec > 60)
|| (*fsec < INT64CONST(0)) || (*fsec >= INT64CONST(1000000)))
return DTERR_FIELD_OVERFLOW;
#else
if ((tm->tm_hour < 0)
|| (tm->tm_min < 0) || (tm->tm_min > 59)
|| (tm->tm_sec < 0) || (tm->tm_sec > 60)
|| (*fsec < 0) || (*fsec >= 1))
return DTERR_FIELD_OVERFLOW;
#endif
return 0;
}
/* DecodeNumber()
* Interpret plain numeric field as a date value in context.
* Return 0 if okay, a DTERR code if not.
*/
static int
DecodeNumber(int flen, char *str, bool haveTextMonth, int fmask,
int *tmask, struct pg_tm * tm, fsec_t *fsec, int *is2digits)
{
int val;
char *cp;
int dterr;
*tmask = 0;
val = strtol(str, &cp, 10);
if (cp == str)
return DTERR_BAD_FORMAT;
if (*cp == '.')
{
double frac;
/*
* More than two digits before decimal point? Then could be a date
* or a run-together time: 2001.360 20011225 040506.789
*/
if ((cp - str) > 2)
{
dterr = DecodeNumberField(flen, str,
(fmask | DTK_DATE_M),
tmask, tm,
fsec, is2digits);
if (dterr < 0)
return dterr;
return 0;
}
frac = strtod(cp, &cp);
if (*cp != '\0')
return DTERR_BAD_FORMAT;
#ifdef HAVE_INT64_TIMESTAMP
*fsec = rint(frac * 1000000);
#else
*fsec = frac;
#endif
}
else if (*cp != '\0')
return DTERR_BAD_FORMAT;
/* Special case for day of year */
if ((flen == 3) &&
((fmask & DTK_DATE_M) == DTK_M(YEAR)) &&
((val >= 1) && (val <= 366)))
{
*tmask = (DTK_M(DOY) | DTK_M(MONTH) | DTK_M(DAY));
tm->tm_yday = val;
/* tm_mon and tm_mday can't actually be set yet ... */
return 0;
}
/* Switch based on what we have so far */
switch (fmask & DTK_DATE_M)
{
case 0:
/*
* Nothing so far; make a decision about what we think the
* input is. There used to be lots of heuristics here, but
* the consensus now is to be paranoid. It *must* be either
* YYYY-MM-DD (with a more-than-two-digit year field), or the
* field order defined by DateOrder.
*/
if (flen >= 3 || DateOrder == DATEORDER_YMD)
{
*tmask = DTK_M(YEAR);
tm->tm_year = val;
}
else if (DateOrder == DATEORDER_DMY)
{
*tmask = DTK_M(DAY);
tm->tm_mday = val;
}
else
{
*tmask = DTK_M(MONTH);
tm->tm_mon = val;
}
break;
case (DTK_M(YEAR)):
/* Must be at second field of YY-MM-DD */
*tmask = DTK_M(MONTH);
tm->tm_mon = val;
break;
case (DTK_M(MONTH)):
if (haveTextMonth)
{
/*
* We are at the first numeric field of a date that included
* a textual month name. We want to support the variants
* MON-DD-YYYY, DD-MON-YYYY, and YYYY-MON-DD as unambiguous
* inputs. We will also accept MON-DD-YY or DD-MON-YY in
* either DMY or MDY modes, as well as YY-MON-DD in YMD mode.
*/
if (flen >= 3 || DateOrder == DATEORDER_YMD)
{
*tmask = DTK_M(YEAR);
tm->tm_year = val;
}
else
{
*tmask = DTK_M(DAY);
tm->tm_mday = val;
}
}
else
{
/* Must be at second field of MM-DD-YY */
*tmask = DTK_M(DAY);
tm->tm_mday = val;
}
break;
case (DTK_M(YEAR) | DTK_M(MONTH)):
if (haveTextMonth)
{
/* Need to accept DD-MON-YYYY even in YMD mode */
if (flen >= 3 && *is2digits)
{
/* Guess that first numeric field is day was wrong */
*tmask = DTK_M(DAY); /* YEAR is already set */
tm->tm_mday = tm->tm_year;
tm->tm_year = val;
*is2digits = FALSE;
}
else
{
*tmask = DTK_M(DAY);
tm->tm_mday = val;
}
}
else
{
/* Must be at third field of YY-MM-DD */
*tmask = DTK_M(DAY);
tm->tm_mday = val;
}
break;
case (DTK_M(DAY)):
/* Must be at second field of DD-MM-YY */
*tmask = DTK_M(MONTH);
tm->tm_mon = val;
break;
case (DTK_M(MONTH) | DTK_M(DAY)):
/* Must be at third field of DD-MM-YY or MM-DD-YY */
*tmask = DTK_M(YEAR);
tm->tm_year = val;
break;
case (DTK_M(YEAR) | DTK_M(MONTH) | DTK_M(DAY)):
/* we have all the date, so it must be a time field */
dterr = DecodeNumberField(flen, str, fmask,
tmask, tm,
fsec, is2digits);
if (dterr < 0)
return dterr;
return 0;
default:
/* Anything else is bogus input */
return DTERR_BAD_FORMAT;
}
/*
* When processing a year field, mark it for adjustment if it's
* only one or two digits.
*/
if (*tmask == DTK_M(YEAR))
*is2digits = (flen <= 2);
return 0;
}
/* DecodeNumberField()
* Interpret numeric string as a concatenated date or time field.
* Return a DTK token (>= 0) if successful, a DTERR code (< 0) if not.
*
* Use the context of previously decoded fields to help with
* the interpretation.
*/
static int
DecodeNumberField(int len, char *str, int fmask,
int *tmask, struct pg_tm * tm, fsec_t *fsec, int *is2digits)
{
char *cp;
/*
* Have a decimal point? Then this is a date or something with a
* seconds field...
*/
if ((cp = strchr(str, '.')) != NULL)
{
double frac;
frac = strtod(cp, NULL);
#ifdef HAVE_INT64_TIMESTAMP
*fsec = rint(frac * 1000000);
#else
*fsec = frac;
#endif
*cp = '\0';
len = strlen(str);
}
/* No decimal point and no complete date yet? */
else if ((fmask & DTK_DATE_M) != DTK_DATE_M)
{
/* yyyymmdd? */
if (len == 8)
{
*tmask = DTK_DATE_M;
tm->tm_mday = atoi(str + 6);
*(str + 6) = '\0';
tm->tm_mon = atoi(str + 4);
*(str + 4) = '\0';
tm->tm_year = atoi(str + 0);
return DTK_DATE;
}
/* yymmdd? */
else if (len == 6)
{
*tmask = DTK_DATE_M;
tm->tm_mday = atoi(str + 4);
*(str + 4) = '\0';
tm->tm_mon = atoi(str + 2);
*(str + 2) = '\0';
tm->tm_year = atoi(str + 0);
*is2digits = TRUE;
return DTK_DATE;
}
}
/* not all time fields are specified? */
if ((fmask & DTK_TIME_M) != DTK_TIME_M)
{
/* hhmmss */
if (len == 6)
{
*tmask = DTK_TIME_M;
tm->tm_sec = atoi(str + 4);
*(str + 4) = '\0';
tm->tm_min = atoi(str + 2);
*(str + 2) = '\0';
tm->tm_hour = atoi(str + 0);
return DTK_TIME;
}
/* hhmm? */
else if (len == 4)
{
*tmask = DTK_TIME_M;
tm->tm_sec = 0;
tm->tm_min = atoi(str + 2);
*(str + 2) = '\0';
tm->tm_hour = atoi(str + 0);
return DTK_TIME;
}
}
return DTERR_BAD_FORMAT;
}
/* DecodeTimezone()
* Interpret string as a numeric timezone.
*
* Return 0 if okay (and set *tzp), a DTERR code if not okay.
*
* NB: this must *not* ereport on failure; see commands/variable.c.
*
* Note: we allow timezone offsets up to 13:59. There are places that
* use +1300 summer time.
*/
static int
DecodeTimezone(char *str, int *tzp)
{
int tz;
int hr,
min;
char *cp;
/* leading character must be "+" or "-" */
if (*str != '+' && *str != '-')
return DTERR_BAD_FORMAT;
hr = strtol((str + 1), &cp, 10);
/* explicit delimiter? */
if (*cp == ':')
min = strtol((cp + 1), &cp, 10);
/* otherwise, might have run things together... */
else if ((*cp == '\0') && (strlen(str) > 3))
{
min = hr % 100;
hr = hr / 100;
}
else
min = 0;
if ((hr < 0) || (hr > 13))
return DTERR_TZDISP_OVERFLOW;
if ((min < 0) || (min >= 60))
return DTERR_TZDISP_OVERFLOW;
tz = (hr * 60 + min) * 60;
if (*str == '-')
tz = -tz;
*tzp = -tz;
if (*cp != '\0')
return DTERR_BAD_FORMAT;
return 0;
}
/* DecodePosixTimezone()
* Interpret string as a POSIX-compatible timezone:
* PST-hh:mm
* PST+h
* PST
* - thomas 2000-03-15
*
* Return 0 if okay (and set *tzp), a DTERR code if not okay.
*/
static int
DecodePosixTimezone(char *str, int *tzp)
{
int val,
tz;
int type;
int dterr;
char *cp;
char delim;
/* advance over name part */
cp = str;
while (*cp && isalpha((unsigned char) *cp))
cp++;
/* decode offset, if present */
if (*cp)
{
dterr = DecodeTimezone(cp, &tz);
if (dterr)
return dterr;
}
else
tz = 0;
/* decode name part. We must temporarily scribble on the input! */
delim = *cp;
*cp = '\0';
type = DecodeSpecial(MAXDATEFIELDS - 1, str, &val);
*cp = delim;
switch (type)
{
case DTZ:
case TZ:
*tzp = (val * 60) - tz;
break;
default:
return DTERR_BAD_FORMAT;
}
return 0;
}
/* DecodeSpecial()
* Decode text string using lookup table.
*
* Implement a cache lookup since it is likely that dates
* will be related in format.
*
* NB: this must *not* ereport on failure;
* see commands/variable.c.
*/
int
DecodeSpecial(int field, char *lowtoken, int *val)
{
int type;
datetkn *tp;
if ((datecache[field] != NULL)
&& (strncmp(lowtoken, datecache[field]->token, TOKMAXLEN) == 0))
tp = datecache[field];
else
{
tp = NULL;
if (Australian_timezones)
tp = datebsearch(lowtoken, australian_datetktbl,
australian_szdatetktbl);
if (!tp)
tp = datebsearch(lowtoken, datetktbl, szdatetktbl);
}
datecache[field] = tp;
if (tp == NULL)
{
type = UNKNOWN_FIELD;
*val = 0;
}
else
{
type = tp->type;
switch (type)
{
case TZ:
case DTZ:
case DTZMOD:
*val = FROMVAL(tp);
break;
default:
*val = tp->value;
break;
}
}
return type;
}
/* DecodeInterval()
* Interpret previously parsed fields for general time interval.
* Returns 0 if successful, DTERR code if bogus input detected.
*
* Allow "date" field DTK_DATE since this could be just
* an unsigned floating point number. - thomas 1997-11-16
*
* Allow ISO-style time span, with implicit units on number of days
* preceding an hh:mm:ss field. - thomas 1998-04-30
*/
int
DecodeInterval(char **field, int *ftype, int nf, int *dtype, struct pg_tm * tm, fsec_t *fsec)
{
int is_before = FALSE;
char *cp;
int fmask = 0,
tmask,
type;
int i;
int dterr;
int val;
double fval;
*dtype = DTK_DELTA;
type = IGNORE_DTF;
tm->tm_year = 0;
tm->tm_mon = 0;
tm->tm_mday = 0;
tm->tm_hour = 0;
tm->tm_min = 0;
tm->tm_sec = 0;
*fsec = 0;
/* read through list backwards to pick up units before values */
for (i = nf - 1; i >= 0; i--)
{
switch (ftype[i])
{
case DTK_TIME:
dterr = DecodeTime(field[i], fmask, &tmask, tm, fsec);
if (dterr)
return dterr;
type = DTK_DAY;
break;
case DTK_TZ:
/*
* Timezone is a token with a leading sign character and
* otherwise the same as a non-signed time field
*/
Assert((*field[i] == '-') || (*field[i] == '+'));
/*
* A single signed number ends up here, but will be
* rejected by DecodeTime(). So, work this out to drop
* through to DTK_NUMBER, which *can* tolerate this.
*/
cp = field[i] + 1;
while ((*cp != '\0') && (*cp != ':') && (*cp != '.'))
cp++;
if ((*cp == ':') &&
(DecodeTime(field[i] + 1, fmask, &tmask, tm, fsec) == 0))
{
if (*field[i] == '-')
{
/* flip the sign on all fields */
tm->tm_hour = -tm->tm_hour;
tm->tm_min = -tm->tm_min;
tm->tm_sec = -tm->tm_sec;
*fsec = -(*fsec);
}
/*
* Set the next type to be a day, if units are not
* specified. This handles the case of '1 +02:03'
* since we are reading right to left.
*/
type = DTK_DAY;
tmask = DTK_M(TZ);
break;
}
else if (type == IGNORE_DTF)
{
if (*cp == '.')
{
/*
* Got a decimal point? Then assume some sort of
* seconds specification
*/
type = DTK_SECOND;
}
else if (*cp == '\0')
{
/*
* Only a signed integer? Then must assume a
* timezone-like usage
*/
type = DTK_HOUR;
}
}
/* DROP THROUGH */
case DTK_DATE:
case DTK_NUMBER:
val = strtol(field[i], &cp, 10);
if (type == IGNORE_DTF)
type = DTK_SECOND;
if (*cp == '.')
{
fval = strtod(cp, &cp);
if (*cp != '\0')
return DTERR_BAD_FORMAT;
if (*field[i] == '-')
fval = -(fval);
}
else if (*cp == '\0')
fval = 0;
else
return DTERR_BAD_FORMAT;
tmask = 0; /* DTK_M(type); */
switch (type)
{
case DTK_MICROSEC:
#ifdef HAVE_INT64_TIMESTAMP
*fsec += (val + fval);
#else
*fsec += ((val + fval) * 1e-6);
#endif
break;
case DTK_MILLISEC:
#ifdef HAVE_INT64_TIMESTAMP
*fsec += ((val + fval) * 1000);
#else
*fsec += ((val + fval) * 1e-3);
#endif
break;
case DTK_SECOND:
tm->tm_sec += val;
#ifdef HAVE_INT64_TIMESTAMP
*fsec += (fval * 1000000);
#else
*fsec += fval;
#endif
tmask = DTK_M(SECOND);
break;
case DTK_MINUTE:
tm->tm_min += val;
if (fval != 0)
{
int sec;
fval *= 60;
sec = fval;
tm->tm_sec += sec;
#ifdef HAVE_INT64_TIMESTAMP
*fsec += ((fval - sec) * 1000000);
#else
*fsec += (fval - sec);
#endif
}
tmask = DTK_M(MINUTE);
break;
case DTK_HOUR:
tm->tm_hour += val;
if (fval != 0)
{
int sec;
fval *= 3600;
sec = fval;
tm->tm_sec += sec;
#ifdef HAVE_INT64_TIMESTAMP
*fsec += ((fval - sec) * 1000000);
#else
*fsec += (fval - sec);
#endif
}
tmask = DTK_M(HOUR);
break;
case DTK_DAY:
tm->tm_mday += val;
if (fval != 0)
{
int sec;
fval *= 86400;
sec = fval;
tm->tm_sec += sec;
#ifdef HAVE_INT64_TIMESTAMP
*fsec += ((fval - sec) * 1000000);
#else
*fsec += (fval - sec);
#endif
}
tmask = ((fmask & DTK_M(DAY)) ? 0 : DTK_M(DAY));
break;
case DTK_WEEK:
tm->tm_mday += val * 7;
if (fval != 0)
{
int sec;
fval *= (7 * 86400);
sec = fval;
tm->tm_sec += sec;
#ifdef HAVE_INT64_TIMESTAMP
*fsec += ((fval - sec) * 1000000);
#else
*fsec += (fval - sec);
#endif
}
tmask = ((fmask & DTK_M(DAY)) ? 0 : DTK_M(DAY));
break;
case DTK_MONTH:
tm->tm_mon += val;
if (fval != 0)
{
int sec;
fval *= (30 * 86400);
sec = fval;
tm->tm_sec += sec;
#ifdef HAVE_INT64_TIMESTAMP
*fsec += ((fval - sec) * 1000000);
#else
*fsec += (fval - sec);
#endif
}
tmask = DTK_M(MONTH);
break;
case DTK_YEAR:
tm->tm_year += val;
if (fval != 0)
tm->tm_mon += (fval * 12);
tmask = ((fmask & DTK_M(YEAR)) ? 0 : DTK_M(YEAR));
break;
case DTK_DECADE:
tm->tm_year += val * 10;
if (fval != 0)
tm->tm_mon += (fval * 120);
tmask = ((fmask & DTK_M(YEAR)) ? 0 : DTK_M(YEAR));
break;
case DTK_CENTURY:
tm->tm_year += val * 100;
if (fval != 0)
tm->tm_mon += (fval * 1200);
tmask = ((fmask & DTK_M(YEAR)) ? 0 : DTK_M(YEAR));
break;
case DTK_MILLENNIUM:
tm->tm_year += val * 1000;
if (fval != 0)
tm->tm_mon += (fval * 12000);
tmask = ((fmask & DTK_M(YEAR)) ? 0 : DTK_M(YEAR));
break;
default:
return DTERR_BAD_FORMAT;
}
break;
case DTK_STRING:
case DTK_SPECIAL:
type = DecodeUnits(i, field[i], &val);
if (type == IGNORE_DTF)
continue;
tmask = 0; /* DTK_M(type); */
switch (type)
{
case UNITS:
type = val;
break;
case AGO:
is_before = TRUE;
type = val;
break;
case RESERV:
tmask = (DTK_DATE_M || DTK_TIME_M);
*dtype = val;
break;
default:
return DTERR_BAD_FORMAT;
}
break;
default:
return DTERR_BAD_FORMAT;
}
if (tmask & fmask)
return DTERR_BAD_FORMAT;
fmask |= tmask;
}
if (*fsec != 0)
{
int sec;
#ifdef HAVE_INT64_TIMESTAMP
sec = (*fsec / INT64CONST(1000000));
*fsec -= (sec * INT64CONST(1000000));
#else
TMODULO(*fsec, sec, 1e0);
#endif
tm->tm_sec += sec;
}
if (is_before)
{
*fsec = -(*fsec);
tm->tm_sec = -(tm->tm_sec);
tm->tm_min = -(tm->tm_min);
tm->tm_hour = -(tm->tm_hour);
tm->tm_mday = -(tm->tm_mday);
tm->tm_mon = -(tm->tm_mon);
tm->tm_year = -(tm->tm_year);
}
/* ensure that at least one time field has been found */
if (fmask == 0)
return DTERR_BAD_FORMAT;
return 0;
}
/* DecodeUnits()
* Decode text string using lookup table.
* This routine supports time interval decoding.
*/
int
DecodeUnits(int field, char *lowtoken, int *val)
{
int type;
datetkn *tp;
if ((deltacache[field] != NULL)
&& (strncmp(lowtoken, deltacache[field]->token, TOKMAXLEN) == 0))
tp = deltacache[field];
else
tp = datebsearch(lowtoken, deltatktbl, szdeltatktbl);
deltacache[field] = tp;
if (tp == NULL)
{
type = UNKNOWN_FIELD;
*val = 0;
}
else
{
type = tp->type;
if ((type == TZ) || (type == DTZ))
*val = FROMVAL(tp);
else
*val = tp->value;
}
return type;
} /* DecodeUnits() */
/*
* Report an error detected by one of the datetime input processing routines.
*
* dterr is the error code, str is the original input string, datatype is
* the name of the datatype we were trying to accept.
*
* Note: it might seem useless to distinguish DTERR_INTERVAL_OVERFLOW and
* DTERR_TZDISP_OVERFLOW from DTERR_FIELD_OVERFLOW, but SQL99 mandates three
* separate SQLSTATE codes, so ...
*/
void
DateTimeParseError(int dterr, const char *str, const char *datatype)
{
switch (dterr)
{
case DTERR_FIELD_OVERFLOW:
ereport(ERROR,
(errcode(ERRCODE_DATETIME_FIELD_OVERFLOW),
errmsg("date/time field value out of range: \"%s\"",
str)));
break;
case DTERR_MD_FIELD_OVERFLOW:
/* <nanny>same as above, but add hint about DateStyle</nanny> */
ereport(ERROR,
(errcode(ERRCODE_DATETIME_FIELD_OVERFLOW),
errmsg("date/time field value out of range: \"%s\"",
str),
errhint("Perhaps you need a different \"datestyle\" setting.")));
break;
case DTERR_INTERVAL_OVERFLOW:
ereport(ERROR,
(errcode(ERRCODE_INTERVAL_FIELD_OVERFLOW),
errmsg("interval field value out of range: \"%s\"",
str)));
break;
case DTERR_TZDISP_OVERFLOW:
ereport(ERROR,
(errcode(ERRCODE_INVALID_TIME_ZONE_DISPLACEMENT_VALUE),
errmsg("time zone displacement out of range: \"%s\"",
str)));
break;
case DTERR_BAD_FORMAT:
default:
ereport(ERROR,
(errcode(ERRCODE_INVALID_DATETIME_FORMAT),
errmsg("invalid input syntax for type %s: \"%s\"",
datatype, str)));
break;
}
}
/* datebsearch()
* Binary search -- from Knuth (6.2.1) Algorithm B. Special case like this
* is WAY faster than the generic bsearch().
*/
static datetkn *
datebsearch(char *key, datetkn *base, unsigned int nel)
{
datetkn *last = base + nel - 1,
*position;
int result;
while (last >= base)
{
position = base + ((last - base) >> 1);
result = key[0] - position->token[0];
if (result == 0)
{
result = strncmp(key, position->token, TOKMAXLEN);
if (result == 0)
return position;
}
if (result < 0)
last = position - 1;
else
base = position + 1;
}
return NULL;
}
/* EncodeDateOnly()
* Encode date as local time.
*/
int
EncodeDateOnly(struct pg_tm * tm, int style, char *str)
{
if ((tm->tm_mon < 1) || (tm->tm_mon > 12))
return -1;
switch (style)
{
case USE_ISO_DATES:
/* compatible with ISO date formats */
if (tm->tm_year > 0)
sprintf(str, "%04d-%02d-%02d",
tm->tm_year, tm->tm_mon, tm->tm_mday);
else
sprintf(str, "%04d-%02d-%02d %s",
-(tm->tm_year - 1), tm->tm_mon, tm->tm_mday, "BC");
break;
case USE_SQL_DATES:
/* compatible with Oracle/Ingres date formats */
if (DateOrder == DATEORDER_DMY)
sprintf(str, "%02d/%02d", tm->tm_mday, tm->tm_mon);
else
sprintf(str, "%02d/%02d", tm->tm_mon, tm->tm_mday);
if (tm->tm_year > 0)
sprintf((str + 5), "/%04d", tm->tm_year);
else
sprintf((str + 5), "/%04d %s", -(tm->tm_year - 1), "BC");
break;
case USE_GERMAN_DATES:
/* German-style date format */
sprintf(str, "%02d.%02d", tm->tm_mday, tm->tm_mon);
if (tm->tm_year > 0)
sprintf((str + 5), ".%04d", tm->tm_year);
else
sprintf((str + 5), ".%04d %s", -(tm->tm_year - 1), "BC");
break;
case USE_POSTGRES_DATES:
default:
/* traditional date-only style for Postgres */
if (DateOrder == DATEORDER_DMY)
sprintf(str, "%02d-%02d", tm->tm_mday, tm->tm_mon);
else
sprintf(str, "%02d-%02d", tm->tm_mon, tm->tm_mday);
if (tm->tm_year > 0)
sprintf((str + 5), "-%04d", tm->tm_year);
else
sprintf((str + 5), "-%04d %s", -(tm->tm_year - 1), "BC");
break;
}
return TRUE;
} /* EncodeDateOnly() */
/* EncodeTimeOnly()
* Encode time fields only.
*/
int
EncodeTimeOnly(struct pg_tm * tm, fsec_t fsec, int *tzp, int style, char *str)
{
if ((tm->tm_hour < 0) || (tm->tm_hour > 24))
return -1;
sprintf(str, "%02d:%02d", tm->tm_hour, tm->tm_min);
/*
* Print fractional seconds if any. The field widths here should be
* at least equal to the larger of MAX_TIME_PRECISION and
* MAX_TIMESTAMP_PRECISION.
*/
if (fsec != 0)
{
#ifdef HAVE_INT64_TIMESTAMP
sprintf((str + strlen(str)), ":%02d.%06d", tm->tm_sec, fsec);
#else
sprintf((str + strlen(str)), ":%013.10f", tm->tm_sec + fsec);
#endif
/* chop off trailing pairs of zeros... */
while ((strcmp((str + strlen(str) - 2), "00") == 0)
&& (*(str + strlen(str) - 3) != '.'))
*(str + strlen(str) - 2) = '\0';
}
else
sprintf((str + strlen(str)), ":%02d", tm->tm_sec);
if (tzp != NULL)
{
int hour,
min;
hour = -(*tzp / 3600);
min = ((abs(*tzp) / 60) % 60);
sprintf((str + strlen(str)), ((min != 0) ? "%+03d:%02d" : "%+03d"), hour, min);
}
return TRUE;
} /* EncodeTimeOnly() */
/* EncodeDateTime()
* Encode date and time interpreted as local time.
* Support several date styles:
* Postgres - day mon hh:mm:ss yyyy tz
* SQL - mm/dd/yyyy hh:mm:ss.ss tz
* ISO - yyyy-mm-dd hh:mm:ss+/-tz
* German - dd.mm.yyyy hh:mm:ss tz
* Variants (affects order of month and day for Postgres and SQL styles):
* US - mm/dd/yyyy
* European - dd/mm/yyyy
*/
int
EncodeDateTime(struct pg_tm * tm, fsec_t fsec, int *tzp, char **tzn, int style, char *str)
{
int day,
hour,
min;
/*
* Why are we checking only the month field? Change this to an
* assert... if ((tm->tm_mon < 1) || (tm->tm_mon > 12)) return -1;
*/
Assert((tm->tm_mon >= 1) && (tm->tm_mon <= 12));
switch (style)
{
case USE_ISO_DATES:
/* Compatible with ISO-8601 date formats */
sprintf(str, "%04d-%02d-%02d %02d:%02d",
((tm->tm_year > 0) ? tm->tm_year : -(tm->tm_year - 1)),
tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min);
/*
* Print fractional seconds if any. The field widths here
* should be at least equal to MAX_TIMESTAMP_PRECISION.
*
* In float mode, don't print fractional seconds before 1 AD,
* since it's unlikely there's any precision left ...
*/
#ifdef HAVE_INT64_TIMESTAMP
if (fsec != 0)
{
sprintf((str + strlen(str)), ":%02d.%06d", tm->tm_sec, fsec);
#else
if ((fsec != 0) && (tm->tm_year > 0))
{
sprintf((str + strlen(str)), ":%09.6f", tm->tm_sec + fsec);
#endif
TrimTrailingZeros(str);
}
else
sprintf((str + strlen(str)), ":%02d", tm->tm_sec);
if (tm->tm_year <= 0)
sprintf((str + strlen(str)), " BC");
/*
* tzp == NULL indicates that we don't want *any* time zone
* info in the output string. *tzn != NULL indicates that we
* have alpha time zone info available. tm_isdst != -1
* indicates that we have a valid time zone translation.
*/
if ((tzp != NULL) && (tm->tm_isdst >= 0))
{
hour = -(*tzp / 3600);
min = ((abs(*tzp) / 60) % 60);
sprintf((str + strlen(str)), ((min != 0) ? "%+03d:%02d" : "%+03d"), hour, min);
}
break;
case USE_SQL_DATES:
/* Compatible with Oracle/Ingres date formats */
if (DateOrder == DATEORDER_DMY)
sprintf(str, "%02d/%02d", tm->tm_mday, tm->tm_mon);
else
sprintf(str, "%02d/%02d", tm->tm_mon, tm->tm_mday);
sprintf((str + 5), "/%04d %02d:%02d",
((tm->tm_year > 0) ? tm->tm_year : -(tm->tm_year - 1)),
tm->tm_hour, tm->tm_min);
/*
* Print fractional seconds if any. The field widths here
* should be at least equal to MAX_TIMESTAMP_PRECISION.
*
* In float mode, don't print fractional seconds before 1 AD,
* since it's unlikely there's any precision left ...
*/
#ifdef HAVE_INT64_TIMESTAMP
if (fsec != 0)
{
sprintf((str + strlen(str)), ":%02d.%06d", tm->tm_sec, fsec);
#else
if ((fsec != 0) && (tm->tm_year > 0))
{
sprintf((str + strlen(str)), ":%09.6f", tm->tm_sec + fsec);
#endif
TrimTrailingZeros(str);
}
else
sprintf((str + strlen(str)), ":%02d", tm->tm_sec);
if (tm->tm_year <= 0)
sprintf((str + strlen(str)), " BC");
if ((tzp != NULL) && (tm->tm_isdst >= 0))
{
if (*tzn != NULL)
sprintf((str + strlen(str)), " %.*s", MAXTZLEN, *tzn);
else
{
hour = -(*tzp / 3600);
min = ((abs(*tzp) / 60) % 60);
sprintf((str + strlen(str)), ((min != 0) ? "%+03d:%02d" : "%+03d"), hour, min);
}
}
break;
case USE_GERMAN_DATES:
/* German variant on European style */
sprintf(str, "%02d.%02d", tm->tm_mday, tm->tm_mon);
sprintf((str + 5), ".%04d %02d:%02d",
((tm->tm_year > 0) ? tm->tm_year : -(tm->tm_year - 1)),
tm->tm_hour, tm->tm_min);
/*
* Print fractional seconds if any. The field widths here
* should be at least equal to MAX_TIMESTAMP_PRECISION.
*
* In float mode, don't print fractional seconds before 1 AD,
* since it's unlikely there's any precision left ...
*/
#ifdef HAVE_INT64_TIMESTAMP
if (fsec != 0)
{
sprintf((str + strlen(str)), ":%02d.%06d", tm->tm_sec, fsec);
#else
if ((fsec != 0) && (tm->tm_year > 0))
{
sprintf((str + strlen(str)), ":%09.6f", tm->tm_sec + fsec);
#endif
TrimTrailingZeros(str);
}
else
sprintf((str + strlen(str)), ":%02d", tm->tm_sec);
if (tm->tm_year <= 0)
sprintf((str + strlen(str)), " BC");
if ((tzp != NULL) && (tm->tm_isdst >= 0))
{
if (*tzn != NULL)
sprintf((str + strlen(str)), " %.*s", MAXTZLEN, *tzn);
else
{
hour = -(*tzp / 3600);
min = ((abs(*tzp) / 60) % 60);
sprintf((str + strlen(str)), ((min != 0) ? "%+03d:%02d" : "%+03d"), hour, min);
}
}
break;
case USE_POSTGRES_DATES:
default:
/* Backward-compatible with traditional Postgres abstime dates */
day = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday);
tm->tm_wday = j2day(day);
strncpy(str, days[tm->tm_wday], 3);
strcpy((str + 3), " ");
if (DateOrder == DATEORDER_DMY)
sprintf((str + 4), "%02d %3s", tm->tm_mday, months[tm->tm_mon - 1]);
else
sprintf((str + 4), "%3s %02d", months[tm->tm_mon - 1], tm->tm_mday);
sprintf((str + 10), " %02d:%02d", tm->tm_hour, tm->tm_min);
/*
* Print fractional seconds if any. The field widths here
* should be at least equal to MAX_TIMESTAMP_PRECISION.
*
* In float mode, don't print fractional seconds before 1 AD,
* since it's unlikely there's any precision left ...
*/
#ifdef HAVE_INT64_TIMESTAMP
if (fsec != 0)
{
sprintf((str + strlen(str)), ":%02d.%06d", tm->tm_sec, fsec);
#else
if ((fsec != 0) && (tm->tm_year > 0))
{
sprintf((str + strlen(str)), ":%09.6f", tm->tm_sec + fsec);
#endif
TrimTrailingZeros(str);
}
else
sprintf((str + strlen(str)), ":%02d", tm->tm_sec);
sprintf((str + strlen(str)), " %04d",
((tm->tm_year > 0) ? tm->tm_year : -(tm->tm_year - 1)));
if (tm->tm_year <= 0)
sprintf((str + strlen(str)), " BC");
if ((tzp != NULL) && (tm->tm_isdst >= 0))
{
if (*tzn != NULL)
sprintf((str + strlen(str)), " %.*s", MAXTZLEN, *tzn);
else
{
/*
* We have a time zone, but no string version. Use the
* numeric form, but be sure to include a leading
* space to avoid formatting something which would be
* rejected by the date/time parser later. - thomas
* 2001-10-19
*/
hour = -(*tzp / 3600);
min = ((abs(*tzp) / 60) % 60);
sprintf((str + strlen(str)), ((min != 0) ? " %+03d:%02d" : " %+03d"), hour, min);
}
}
break;
}
return TRUE;
} /* EncodeDateTime() */
/* EncodeInterval()
* Interpret time structure as a delta time and convert to string.
*
* Support "traditional Postgres" and ISO-8601 styles.
* Actually, afaik ISO does not address time interval formatting,
* but this looks similar to the spec for absolute date/time.
* - thomas 1998-04-30
*/
int
EncodeInterval(struct pg_tm * tm, fsec_t fsec, int style, char *str)
{
int is_before = FALSE;
int is_nonzero = FALSE;
char *cp = str;
/*
* The sign of year and month are guaranteed to match, since they are
* stored internally as "month". But we'll need to check for is_before
* and is_nonzero when determining the signs of hour/minute/seconds
* fields.
*/
switch (style)
{
/* compatible with ISO date formats */
case USE_ISO_DATES:
if (tm->tm_year != 0)
{
sprintf(cp, "%d year%s",
tm->tm_year, ((tm->tm_year != 1) ? "s" : ""));
cp += strlen(cp);
is_before = (tm->tm_year < 0);
is_nonzero = TRUE;
}
if (tm->tm_mon != 0)
{
sprintf(cp, "%s%s%d mon%s", (is_nonzero ? " " : ""),
((is_before && (tm->tm_mon > 0)) ? "+" : ""),
tm->tm_mon, ((tm->tm_mon != 1) ? "s" : ""));
cp += strlen(cp);
is_before = (tm->tm_mon < 0);
is_nonzero = TRUE;
}
if (tm->tm_mday != 0)
{
sprintf(cp, "%s%s%d day%s", (is_nonzero ? " " : ""),
((is_before && (tm->tm_mday > 0)) ? "+" : ""),
tm->tm_mday, ((tm->tm_mday != 1) ? "s" : ""));
cp += strlen(cp);
is_before = (tm->tm_mday < 0);
is_nonzero = TRUE;
}
if ((!is_nonzero) || (tm->tm_hour != 0) || (tm->tm_min != 0)
|| (tm->tm_sec != 0) || (fsec != 0))
{
int minus = ((tm->tm_hour < 0) || (tm->tm_min < 0)
|| (tm->tm_sec < 0) || (fsec < 0));
sprintf(cp, "%s%s%02d:%02d", (is_nonzero ? " " : ""),
(minus ? "-" : (is_before ? "+" : "")),
abs(tm->tm_hour), abs(tm->tm_min));
cp += strlen(cp);
/* Mark as "non-zero" since the fields are now filled in */
is_nonzero = TRUE;
/* need fractional seconds? */
if (fsec != 0)
{
#ifdef HAVE_INT64_TIMESTAMP
sprintf(cp, ":%02d", abs(tm->tm_sec));
cp += strlen(cp);
sprintf(cp, ".%06d", ((fsec >= 0) ? fsec : -(fsec)));
#else
fsec += tm->tm_sec;
sprintf(cp, ":%013.10f", fabs(fsec));
#endif
TrimTrailingZeros(cp);
cp += strlen(cp);
}
else
{
sprintf(cp, ":%02d", abs(tm->tm_sec));
cp += strlen(cp);
}
}
break;
case USE_POSTGRES_DATES:
default:
strcpy(cp, "@ ");
cp += strlen(cp);
if (tm->tm_year != 0)
{
int year = tm->tm_year;
if (tm->tm_year < 0)
year = -year;
sprintf(cp, "%d year%s", year,
((year != 1) ? "s" : ""));
cp += strlen(cp);
is_before = (tm->tm_year < 0);
is_nonzero = TRUE;
}
if (tm->tm_mon != 0)
{
int mon = tm->tm_mon;
if (is_before || ((!is_nonzero) && (tm->tm_mon < 0)))
mon = -mon;
sprintf(cp, "%s%d mon%s", (is_nonzero ? " " : ""), mon,
((mon != 1) ? "s" : ""));
cp += strlen(cp);
if (!is_nonzero)
is_before = (tm->tm_mon < 0);
is_nonzero = TRUE;
}
if (tm->tm_mday != 0)
{
int day = tm->tm_mday;
if (is_before || ((!is_nonzero) && (tm->tm_mday < 0)))
day = -day;
sprintf(cp, "%s%d day%s", (is_nonzero ? " " : ""), day,
((day != 1) ? "s" : ""));
cp += strlen(cp);
if (!is_nonzero)
is_before = (tm->tm_mday < 0);
is_nonzero = TRUE;
}
if (tm->tm_hour != 0)
{
int hour = tm->tm_hour;
if (is_before || ((!is_nonzero) && (tm->tm_hour < 0)))
hour = -hour;
sprintf(cp, "%s%d hour%s", (is_nonzero ? " " : ""), hour,
((hour != 1) ? "s" : ""));
cp += strlen(cp);
if (!is_nonzero)
is_before = (tm->tm_hour < 0);
is_nonzero = TRUE;
}
if (tm->tm_min != 0)
{
int min = tm->tm_min;
if (is_before || ((!is_nonzero) && (tm->tm_min < 0)))
min = -min;
sprintf(cp, "%s%d min%s", (is_nonzero ? " " : ""), min,
((min != 1) ? "s" : ""));
cp += strlen(cp);
if (!is_nonzero)
is_before = (tm->tm_min < 0);
is_nonzero = TRUE;
}
/* fractional seconds? */
if (fsec != 0)
{
#ifdef HAVE_INT64_TIMESTAMP
if (is_before || ((!is_nonzero) && (tm->tm_sec < 0)))
tm->tm_sec = -tm->tm_sec;
sprintf(cp, "%s%d.%02d secs", (is_nonzero ? " " : ""),
tm->tm_sec, (((int) fsec) / 10000));
cp += strlen(cp);
if (!is_nonzero)
is_before = (fsec < 0);
#else
fsec_t sec;
fsec += tm->tm_sec;
sec = fsec;
if (is_before || ((!is_nonzero) && (fsec < 0)))
sec = -sec;
sprintf(cp, "%s%.2f secs", (is_nonzero ? " " : ""), sec);
cp += strlen(cp);
if (!is_nonzero)
is_before = (fsec < 0);
#endif
is_nonzero = TRUE;
/* otherwise, integer seconds only? */
}
else if (tm->tm_sec != 0)
{
int sec = tm->tm_sec;
if (is_before || ((!is_nonzero) && (tm->tm_sec < 0)))
sec = -sec;
sprintf(cp, "%s%d sec%s", (is_nonzero ? " " : ""), sec,
((sec != 1) ? "s" : ""));
cp += strlen(cp);
if (!is_nonzero)
is_before = (tm->tm_sec < 0);
is_nonzero = TRUE;
}
break;
}
/* identically zero? then put in a unitless zero... */
if (!is_nonzero)
{
strcat(cp, "0");
cp += strlen(cp);
}
if (is_before && (style == USE_POSTGRES_DATES))
{
strcat(cp, " ago");
cp += strlen(cp);
}
return 0;
} /* EncodeInterval() */
/* GUC assign_hook for australian_timezones */
bool
ClearDateCache(bool newval, bool doit, GucSource source)
{
int i;
if (doit)
{
for (i = 0; i < MAXDATEFIELDS; i++)
datecache[i] = NULL;
}
return true;
}
/*
* We've been burnt by stupid errors in the ordering of the datetkn tables
* once too often. Arrange to check them during postmaster start.
*/
static bool
CheckDateTokenTable(const char *tablename, datetkn *base, unsigned int nel)
{
bool ok = true;
unsigned int i;
for (i = 1; i < nel; i++)
{
if (strncmp(base[i - 1].token, base[i].token, TOKMAXLEN) >= 0)
{
elog(LOG, "ordering error in %s table: \"%.*s\" >= \"%.*s\"",
tablename,
TOKMAXLEN, base[i - 1].token,
TOKMAXLEN, base[i].token);
ok = false;
}
}
return ok;
}
bool
CheckDateTokenTables(void)
{
bool ok = true;
Assert(UNIX_EPOCH_JDATE == date2j(1970, 1, 1));
Assert(POSTGRES_EPOCH_JDATE == date2j(2000, 1, 1));
ok &= CheckDateTokenTable("datetktbl", datetktbl, szdatetktbl);
ok &= CheckDateTokenTable("deltatktbl", deltatktbl, szdeltatktbl);
ok &= CheckDateTokenTable("australian_datetktbl",
australian_datetktbl,
australian_szdatetktbl);
return ok;
}
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