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

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/*-------------------------------------------------------------------------
*
* datetime.c
* Support functions for date/time types.
*
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/datetime.c,v 1.81 2001/11/21 22:57:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <ctype.h>
#include <math.h>
#include <sys/types.h>
#include <errno.h>
#include <float.h>
#include <limits.h>
#include "miscadmin.h"
#include "utils/guc.h"
#include "utils/datetime.h"
static int DecodeNumber(int flen, char *field,
int fmask, int *tmask,
struct tm * tm, double *fsec, int *is2digits);
static int DecodeNumberField(int len, char *str,
int fmask, int *tmask,
struct tm * tm, double *fsec, int *is2digits);
static int DecodeTime(char *str, int fmask, int *tmask,
struct tm * tm, double *fsec);
static int DecodeTimezone(char *str, int *tzp);
static datetkn *datebsearch(char *key, datetkn *base, unsigned int nel);
static int DecodeDate(char *str, int fmask, int *tmask, struct tm * tm);
static int DecodePosixTimezone(char *str, int *val);
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" */
#define ABS_SIGNBIT ((char) 0200)
#define VALMASK ((char) 0177)
#define NEG(n) ((n)|ABS_SIGNBIT)
#define SIGNEDCHAR(c) ((c)&ABS_SIGNBIT? -((c)&VALMASK): (c))
#define FROMVAL(tp) (-SIGNEDCHAR((tp)->value) * 10) /* uncompress */
#define TOVAL(tp, v) ((tp)->value = ((v) < 0? NEG((-(v))/10): (v)/10))
/*
* to keep this table reasonably small, we divide the lexval for TZ and DTZ
* entries by 10 and truncate the text field at MAXTOKLEN characters.
* the text field is not guaranteed to be NULL-terminated.
*/
static datetkn datetktbl[] = {
/* text, token, lexval */
{EARLY, RESERV, DTK_EARLY}, /* "-infinity" reserved for "early time" */
{"acsst", DTZ, 63}, /* Cent. Australia */
{"acst", DTZ, NEG(24)}, /* Atlantic/Porto Acre */
{"act", TZ, NEG(30)}, /* Atlantic/Porto Acre */
{DA_D, ADBC, AD}, /* "ad" for years >= 0 */
{"abstime", IGNORE, 0}, /* "abstime" for pre-v6.1 "Invalid
* Abstime" */
{"adt", DTZ, NEG(18)}, /* Atlantic Daylight Time */
{"aesst", DTZ, 66}, /* E. Australia */
{"aest", TZ, 60}, /* Australia Eastern Std Time */
{"aft", TZ, 27}, /* Kabul */
{"ahst", TZ, NEG(60)}, /* Alaska-Hawaii Std Time */
{"akdt", DTZ, NEG(48)}, /* Alaska Daylight Time */
{"akst", DTZ, NEG(54)}, /* Alaska Standard Time */
{"allballs", RESERV, DTK_ZULU}, /* 00:00:00 */
{"almt", TZ, 36}, /* Almaty Time */
{"almst", TZ, 42}, /* Almaty Savings Time */
{"am", AMPM, AM},
#if 0
{"amst", DTZ, 30}, /* Yerevan */
{"amst", DTZ, NEG(18)}, /* Porto Velho */
amt
anast
anat
aqtst
aqtt
arst
art
ashst
#endif
{"apr", MONTH, 4},
{"april", MONTH, 4},
{"ast", TZ, NEG(24)}, /* Atlantic Std Time (Canada) */
{"at", IGNORE, 0}, /* "at" (throwaway) */
{"aug", MONTH, 8},
{"august", MONTH, 8},
{"awsst", DTZ, 54}, /* W. Australia */
{"awst", TZ, 48}, /* W. Australia */
{"awt", DTZ, NEG(18)},
#if 0
azost
azot
azst
azt
#endif
{DB_C, ADBC, BC}, /* "bc" for years < 0 */
{"bdst", TZ, 12}, /* British Double Summer Time */
{"bdt", TZ, 36}, /* Dacca */
#if 0
bnt
bort
bortst
bost
bot
brst
brt
#endif
{"bst", TZ, 6}, /* British Summer Time */
{"bt", TZ, 18}, /* Baghdad Time */
#if 0
btt
#endif
{"cadt", DTZ, 63}, /* Central Australian DST */
{"cast", TZ, 57}, /* Central Australian ST */
{"cat", TZ, NEG(60)}, /* Central Alaska Time */
{"cct", TZ, 48}, /* China Coast */
#if 0
{"cct", TZ, 39}, /* Indian Cocos (Island) Time */
#endif
{"cdt", DTZ, NEG(30)}, /* Central Daylight Time */
{"cest", DTZ, 12}, /* Central European Dayl.Time */
{"cet", TZ, 6}, /* Central European Time */
{"cetdst", DTZ, 12}, /* Central European Dayl.Time */
#if 0
chadt
chast
ckhst
ckt
clst
clt
cost
cot
#endif
{"cst", TZ, NEG(36)}, /* Central Standard Time */
#if 0
cvst
cvt
#endif
{"cxt", TZ, 42}, /* Indian Christmas (Island) Time */
{DCURRENT, RESERV, DTK_CURRENT}, /* "current" is always now */
{"d", UNITS, DAY}, /* "day of month" for ISO input */
#if 0
davt
ddut
#endif
{"dec", MONTH, 12},
{"december", MONTH, 12},
{"dnt", TZ, 6}, /* Dansk Normal Tid */
{"dow", RESERV, DTK_DOW}, /* day of week */
{"doy", RESERV, DTK_DOY}, /* day of year */
{"dst", DTZMOD, 6},
#if 0
{"dusst", DTZ, 36}, /* Dushanbe Summer Time */
{"easst", DTZ, NEG(30)}, /* Easter Island */
{"east", TZ, NEG(36)}, /* Easter Island */
#endif
{"east", TZ, 24}, /* Indian Antananarivo Savings Time */
{"eat", TZ, 18}, /* Indian Antananarivo Time */
#if 0
ect
#endif
{"edt", DTZ, NEG(24)}, /* Eastern Daylight Time */
#if 0
eest
#endif
{"eet", TZ, 12}, /* East. Europe, USSR Zone 1 */
{"eetdst", DTZ, 18}, /* Eastern Europe */
#if 0
egst
egt
ehdt
#endif
{EPOCH, RESERV, DTK_EPOCH}, /* "epoch" reserved for system epoch time */
{"est", TZ, NEG(30)}, /* Eastern Standard Time */
{"feb", MONTH, 2},
{"february", MONTH, 2},
#if 0
fjst
fjt
fkst
fkt
fnst
fnt
#endif
{"fri", DOW, 5},
{"friday", DOW, 5},
{"fst", TZ, 6}, /* French Summer Time */
{"fwt", DTZ, 12}, /* French Winter Time */
#if 0
galt
gamt
gest
get
gft
ghst
gilt
#endif
{"gmt", TZ, 0}, /* Greenwish Mean Time */
{"gst", TZ, 60}, /* Guam Std Time, USSR Zone 9 */
#if 0
gyt
#endif
{"h", UNITS, HOUR}, /* "hour" */
#if 0
hadt
hast
#endif
{"hdt", DTZ, NEG(54)}, /* Hawaii/Alaska */
#if 0
hkst
hkt
#endif
{"hmt", DTZ, 18}, /* Hellas ? ? */
#if 0
hovst
hovt
#endif
{"hst", TZ, NEG(60)}, /* Hawaii Std Time */
#if 0
hwt
ict
#endif
{"idle", TZ, 72}, /* Intl. Date Line, East */
{"idlw", TZ, NEG(72)}, /* Intl. Date Line, West */
#if 0
idt
#endif
{LATE, RESERV, DTK_LATE}, /* "infinity" reserved for "late time" */
{INVALID, RESERV, DTK_INVALID}, /* "invalid" reserved for bad time */
{"iot", TZ, 30}, /* Indian Chagos Time */
#if 0
irkst
irkt
irt
isst
#endif
{"ist", TZ, 12}, /* Israel */
{"it", TZ, 21}, /* Iran Time */
{"j", UNITS, JULIAN},
{"jan", MONTH, 1},
{"january", MONTH, 1},
#if 0
javt
jayt
#endif
{"jd", UNITS, JULIAN},
{"jst", TZ, 54}, /* Japan Std Time,USSR Zone 8 */
{"jt", TZ, 45}, /* Java Time */
{"jul", MONTH, 7},
{"julian", UNITS, JULIAN},
{"jun", MONTH, 6},
{"june", MONTH, 6},
#if 0
kdt
kgst
kgt
kost
krast
krat
#endif
{"kst", TZ, 54}, /* Korea Standard Time */
#if 0
lhst
#endif
{"ligt", TZ, 60}, /* From Melbourne, Australia */
#if 0
lint
lkt
#endif
{"m", UNITS, MONTH}, /* "month" for ISO input */
#if 0
magst
magt
#endif
{"mar", MONTH, 3},
{"march", MONTH, 3},
#if 0
mart
#endif
{"mawt", TZ, 36}, /* Mawson, Antarctica */
{"may", MONTH, 5},
{"mdt", DTZ, NEG(36)}, /* Mountain Daylight Time */
{"mest", DTZ, 12}, /* Middle Europe Summer Time */
{"met", TZ, 6}, /* Middle Europe Time */
{"metdst", DTZ, 12}, /* Middle Europe Daylight Time */
{"mewt", TZ, 6}, /* Middle Europe Winter Time */
{"mez", TZ, 6}, /* Middle Europe Zone */
{"mht", TZ, 72}, /* Kwajalein */
{"mm", UNITS, MINUTE}, /* "minute" for ISO input */
#if 0
mmt
#endif
{"mon", DOW, 1},
{"monday", DOW, 1},
#if 0
most
mpt
msd
msk
#endif
{"mst", TZ, NEG(42)}, /* Mountain Standard Time */
{"mt", TZ, 51}, /* Moluccas Time */
{"mut", DTZ, 24}, /* Mauritius Island Time */
{"mvt", DTZ, 30}, /* Maldives Island Time */
#if 0
myt
ncst
nct
#endif
{"ndt", DTZ, NEG(15)}, /* Nfld. Daylight Time */
{"nft", TZ, NEG(21)}, /* Newfoundland Standard Time */
{"nor", TZ, 6}, /* Norway Standard Time */
{"nov", MONTH, 11},
{"november", MONTH, 11},
#if 0
novst
novt
#endif
{NOW, RESERV, DTK_NOW}, /* current transaction time */
{"nst", TZ, NEG(21)}, /* Nfld. Standard Time */
{"nt", TZ, NEG(66)}, /* Nome Time */
#if 0
nut
#endif
{"nzdt", DTZ, 78}, /* New Zealand Daylight Time */
{"nzst", TZ, 72}, /* New Zealand Standard Time */
{"nzt", TZ, 72}, /* New Zealand Time */
{"oct", MONTH, 10},
{"october", MONTH, 10},
#if 0
omsst
omst
#endif
{"on", IGNORE, 0}, /* "on" (throwaway) */
{"pdt", DTZ, NEG(42)}, /* Pacific Daylight Time */
#if 0
pest
pet
petst
pett
pgt
phot
phst
pht
pkt
#endif
{"pm", AMPM, PM},
#if 0
pmdt
pmst
pont
#endif
{"pst", TZ, NEG(48)}, /* Pacific Standard Time */
#if 0
pwt
pyst
pyt
#endif
{"ret", DTZ, 24}, /* Reunion Island Time */
{"s", UNITS, SECOND}, /* "seconds" for ISO input */
{"sadt", DTZ, 63}, /* S. Australian Dayl. Time */
#if 0
samst
samt
#endif
{"sast", TZ, 57}, /* South Australian Std Time */
{"sat", DOW, 6},
{"saturday", DOW, 6},
#if 0
sbt
#endif
{"sct", DTZ, 24}, /* Mahe Island Time */
{"sep", MONTH, 9},
{"sept", MONTH, 9},
{"september", MONTH, 9},
{"set", TZ, NEG(6)}, /* Seychelles Time ?? */
#if 0
sgt
#endif
{"sst", DTZ, 12}, /* Swedish Summer Time */
{"sun", DOW, 0},
{"sunday", DOW, 0},
{"swt", TZ, 6}, /* Swedish Winter Time */
#if 0
syot
#endif
{"t", DTK_ISO_TIME, 0}, /* Filler for ISO time fields */
#if 0
taht
#endif
{"tft", TZ, 30}, /* Kerguelen Time */
{"thu", DOW, 4},
{"thur", DOW, 4},
{"thurs", DOW, 4},
{"thursday", DOW, 4},
#if 0
tjt
tkt
tmt
#endif
{TODAY, RESERV, DTK_TODAY}, /* midnight */
{TOMORROW, RESERV, DTK_TOMORROW}, /* tomorrow midnight */
#if 0
tost
tot
tpt
trut
#endif
{"tue", DOW, 2},
{"tues", DOW, 2},
{"tuesday", DOW, 2},
#if 0
tvt
uct
ulast
ulat
#endif
{"undefined", RESERV, DTK_INVALID}, /* pre-v6.1 invalid time */
{"ut", TZ, 0},
{"utc", TZ, 0},
#if 0
uyst
uyt
uzst
uzt
vet
vlast
vlat
vust
vut
#endif
{"wadt", DTZ, 48}, /* West Australian DST */
#if 0
wakt
warst
#endif
{"wast", TZ, 42}, /* West Australian Std Time */
{"wat", TZ, NEG(6)}, /* West Africa Time */
{"wdt", DTZ, 54}, /* West Australian DST */
{"wed", DOW, 3},
{"wednesday", DOW, 3},
{"weds", DOW, 3},
#if 0
west
#endif
{"wet", TZ, 0}, /* Western Europe */
{"wetdst", DTZ, 6}, /* Western Europe */
#if 0
wft
wgst
wgt
#endif
{"wst", TZ, 48}, /* West Australian Std Time */
{"y", UNITS, YEAR}, /* "year" for ISO input */
#if 0
yakst
yakt
yapt
#endif
{"ydt", DTZ, NEG(48)}, /* Yukon Daylight Time */
#if 0
yekst
yekt
#endif
{YESTERDAY, RESERV, DTK_YESTERDAY}, /* yesterday midnight */
{"yst", TZ, NEG(54)}, /* Yukon Standard Time */
{"z", RESERV, DTK_ZULU}, /* 00:00:00 */
{"zp4", TZ, NEG(24)}, /* GMT +4 hours. */
{"zp5", TZ, NEG(30)}, /* GMT +5 hours. */
{"zp6", TZ, NEG(36)}, /* GMT +6 hours. */
{ZULU, RESERV, DTK_ZULU}, /* 00:00:00 */
};
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, 57}, /* Cent. Australia */
{"cst", TZ, 63}, /* Australia Central Std Time */
{"east", TZ, 60}, /* East Australian Std Time */
{"est", TZ, 60}, /* Australia Eastern Std Time */
{"sat", TZ, 57},
};
static unsigned int australian_szdatetktbl = sizeof australian_datetktbl /
sizeof australian_datetktbl[0];
static datetkn deltatktbl[] = {
/* text, token, lexval */
{"@", IGNORE, 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 */
{"decs", UNITS, DTK_DECADE}, /* "decades" relative */
{DDECADE, UNITS, DTK_DECADE}, /* "decade" relative */
{"decades", 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 */
{"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, 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", 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];
datetkn *datecache[MAXDATEFIELDS] = {NULL};
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 23, -4713 on).
*
* Ref: Explanatory Supplement to the Astronomical Almanac, 1992.
* University Science Books, 20 Edgehill Rd. Mill Valley CA 94941.
*
* Use the algorithm by Henry Fliegel, a former NASA/JPL colleague
* now at Aerospace Corp. (hi, Henry!)
*
* These routines will be used by other date/time packages
* - thomas 97/02/25
*/
int
date2j(int y, int m, int d)
{
int m12 = (m - 14) / 12;
return ((1461 * (y + 4800 + m12)) / 4
+ (367 * (m - 2 - 12 * (m12))) / 12
- (3 * ((y + 4900 + m12) / 100)) / 4
+ d - 32075);
} /* date2j() */
void
j2date(int jd, int *year, int *month, int *day)
{
int j,
y,
m,
d;
int i,
l,
n;
l = jd + 68569;
n = (4 * l) / 146097;
l -= (146097 * n + 3) / 4;
i = (4000 * (l + 1)) / 1461001;
l += 31 - (1461 * i) / 4;
j = (80 * l) / 2447;
d = l - (2447 * j) / 80;
l = j / 11;
m = (j + 2) - (12 * l);
y = 100 * (n - 49) + i + l;
*year = y;
*month = m;
*day = d;
return;
} /* j2date() */
int
j2day(int date)
{
int day;
day = (date + 1) % 7;
return day;
} /* j2day() */
/* TrimTrailingZeros()
* ... resulting from printing numbers with full precision.
*/
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... */
while ((*(str + len - 1) == '0')
&& (*(str + len - 3) != '.'))
{
len--;
*(str + len) = '\0';
}
return;
}
/* ParseDateTime()
* Break string into tokens based on a date/time context.
*/
int
ParseDateTime(char *timestr, char *lowstr,
char **field, int *ftype, int maxfields, int *numfields)
{
int nf = 0;
char *cp = timestr;
char *lp = lowstr;
/* outer loop through fields */
while (*cp != '\0')
{
field[nf] = lp;
/* leading digit? then date or time */
if (isdigit((unsigned char) *cp) || (*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 == '.'))
{
ftype[nf] = DTK_DATE;
*lp++ = *cp++;
/* second field is all digits? then no embedded text month */
if (isdigit((unsigned char) *cp))
{
while (isdigit((unsigned char) *cp) || (*cp == '-') ||
(*cp == '/') || (*cp == '.'))
*lp++ = *cp++;
}
else
{
while (isalnum((unsigned char) *cp) || (*cp == '-') ||
(*cp == '/') || (*cp == '.'))
*lp++ = tolower((unsigned char) *cp++);
}
}
/*
* otherwise, number only and will determine year, month, or
* day later
*/
else
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++ = tolower((unsigned char) *cp++);
while (isalpha((unsigned char) *cp))
*lp++ = tolower((unsigned char) *cp++);
/*
* Full date string with leading text month? Could also be a
* POSIX time zone...
*/
if ((*cp == '-') || (*cp == '/') || (*cp == '.'))
{
ftype[nf] = DTK_DATE;
while (isdigit((unsigned char) *cp) ||
(*cp == '-') || (*cp == '/') || (*cp == '.'))
*lp++ = tolower((unsigned char) *cp++);
}
/* skip leading spaces */
}
else if (isspace((unsigned char) *cp))
{
cp++;
continue;
/* 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++ = tolower((unsigned char) *cp++);
while (isalpha((unsigned char) *cp))
*lp++ = tolower((unsigned char) *cp++);
/* otherwise something wrong... */
}
else
return -1;
/* ignore punctuation but use as delimiter */
}
else if (ispunct((unsigned char) *cp))
{
cp++;
continue;
}
else
return -1;
/* force in a delimiter */
*lp++ = '\0';
nf++;
if (nf > MAXDATEFIELDS)
return -1;
}
*numfields = nf;
return 0;
} /* ParseDateTime() */
/* DecodeDateTime()
* Interpret previously parsed fields for general date and time.
* Return 0 if full date, 1 if only time, and -1 if problems.
* 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"
*
* 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 GMT time zone. - thomas 1997/05/27
*/
int
DecodeDateTime(char **field, int *ftype, int nf,
int *dtype, struct tm * tm, double *fsec, int *tzp)
{
int fmask = 0,
tmask,
type;
int ptype = 0; /* "prefix type" for ISO y2001m02d04
* format */
int i;
int flen,
val;
int mer = HR24;
int 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;
tm->tm_isdst = -1; /* don't know daylight savings time status
* apriori */
if (tzp != NULL)
*tzp = 0;
for (i = 0; i < nf; i++)
{
switch (ftype[i])
{
case DTK_DATE:
/*
* Previous field was a label for "julian date"? then this
* should be a julian date with fractional day...
*/
if (ptype == JULIAN)
{
char *cp;
double dt,
date,
time;
dt = strtod(field[i], &cp);
if (*cp != '\0')
return -1;
time = dt * 86400;
TMODULO(time, date, 86400e0);
j2date((int) date, &tm->tm_year, &tm->tm_mon, &tm->tm_mday);
dt2time(time, &tm->tm_hour, &tm->tm_min, fsec);
tmask = DTK_DATE_M | DTK_TIME_M;
*dtype = DTK_DATE;
}
/*
* Already have a date? Then this might be a POSIX time
* zone with an embedded dash (e.g. "PST-3" == "EST") -
* thomas 2000-03-15
*/
else if ((fmask & DTK_DATE_M) == DTK_DATE_M)
{
if ((tzp == NULL)
|| (DecodePosixTimezone(field[i], tzp) != 0))
return -1;
ftype[i] = DTK_TZ;
tmask = DTK_M(TZ);
}
else if (DecodeDate(field[i], fmask, &tmask, tm) != 0)
return -1;
break;
case DTK_TIME:
if (DecodeTime(field[i], fmask, &tmask, tm, fsec) != 0)
return -1;
/*
* Check upper limit on hours; other limits checked in
* DecodeTime()
*/
if (tm->tm_hour > 23)
return -1;
break;
case DTK_TZ:
if (tzp == NULL)
return -1;
{
int tz;
if (DecodeTimezone(field[i], &tz) != 0)
return -1;
/*
* 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:
flen = strlen(field[i]);
/*
* 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);
if (*cp != '\0')
return -1;
switch (ptype)
{
case YEAR:
tm->tm_year = val;
tmask = DTK_M(ptype);
break;
case MONTH:
tm->tm_mon = val;
tmask = DTK_M(ptype);
break;
case DAY:
tm->tm_mday = val;
tmask = DTK_M(ptype);
break;
case HOUR:
tm->tm_hour = val;
tmask = DTK_M(ptype);
break;
case MINUTE:
tm->tm_min = val;
tmask = DTK_M(ptype);
break;
case SECOND:
tm->tm_sec = val;
tmask = DTK_M(ptype);
break;
case JULIAN:
/*
* previous field was a label for "julian
* date"? then this is a julian day with no
* fractional part (see DTK_DATE for cases
* involving fractional parts)
*/
j2date(val, &tm->tm_year, &tm->tm_mon, &tm->tm_mday);
tmask = DTK_DATE_M;
break;
default:
return -1;
break;
}
ptype = 0;
*dtype = DTK_DATE;
}
/*
* long numeric string and either no date or no time read
* yet? then interpret as a concatenated date or time...
*/
else if ((flen > 4) && !((fmask & DTK_DATE_M) && (fmask & DTK_TIME_M)))
{
if (DecodeNumberField(flen, field[i], fmask, &tmask, tm, fsec, &is2digits) != 0)
return -1;
}
/* otherwise it is a single date/time field... */
else if (DecodeNumber(flen, field[i], fmask, &tmask, tm, fsec, &is2digits) != 0)
return -1;
break;
case DTK_STRING:
case DTK_SPECIAL:
type = DecodeSpecial(i, field[i], &val);
if (type == IGNORE)
continue;
tmask = DTK_M(type);
switch (type)
{
case RESERV:
switch (val)
{
case DTK_CURRENT:
elog(ERROR, "'CURRENT' is no longer supported");
return -1;
break;
case DTK_NOW:
tmask = (DTK_DATE_M | DTK_TIME_M | DTK_M(TZ));
*dtype = DTK_DATE;
GetCurrentTimeUsec(tm, fsec);
if (tzp != NULL)
*tzp = CTimeZone;
break;
case DTK_YESTERDAY:
tmask = DTK_DATE_M;
*dtype = DTK_DATE;
GetCurrentTime(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;
GetCurrentTime(tm);
tm->tm_hour = 0;
tm->tm_min = 0;
tm->tm_sec = 0;
break;
case DTK_TOMORROW:
tmask = DTK_DATE_M;
*dtype = DTK_DATE;
GetCurrentTime(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 -1;
*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 -1;
*tzp = val * 60;
ftype[i] = DTK_TZ;
break;
case TZ:
tm->tm_isdst = 0;
if (tzp == NULL)
return -1;
*tzp = val * 60;
ftype[i] = DTK_TZ;
break;
case IGNORE:
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 DTK_ISO_TIME:
tmask = 0;
if ((i < 1) || (i >= (nf - 1))
|| (ftype[i - 1] != DTK_DATE)
|| (ftype[i + 1] != DTK_TIME))
return -1;
break;
default:
return -1;
}
break;
default:
return -1;
}
if (tmask & fmask)
return -1;
fmask |= tmask;
}
/* 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
elog(ERROR, "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;
}
if ((mer != HR24) && (tm->tm_hour > 12))
return -1;
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)
return ((fmask & DTK_TIME_M) == DTK_TIME_M) ? 1 : -1;
/*
* check for valid day of month, now that we know for sure the
* month and year...
*/
if ((tm->tm_mday < 1)
|| (tm->tm_mday > day_tab[isleap(tm->tm_year)][tm->tm_mon - 1]))
return -1;
/* timezone not specified? then find local timezone if possible */
if (((fmask & DTK_DATE_M) == DTK_DATE_M)
&& (tzp != NULL) && (!(fmask & DTK_M(TZ))))
{
/*
* daylight savings time modifier but no standard timezone?
* then error
*/
if (fmask & DTK_M(DTZMOD))
return -1;
*tzp = DetermineLocalTimeZone(tm);
}
}
return 0;
} /* DecodeDateTime() */
/* DetermineLocalTimeZone()
* Given a struct 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 tm's
* tm_isdst field accordingly, and return the actual timezone offset.
*
* This subroutine exists mainly to centralize uses of mktime() and defend
* against mktime() bugs on various platforms...
*/
int
DetermineLocalTimeZone(struct tm * tm)
{
int tz;
if (HasCTZSet)
tz = CTimeZone;
else if (IS_VALID_UTIME(tm->tm_year, tm->tm_mon, tm->tm_mday))
{
#if defined(HAVE_TM_ZONE) || defined(HAVE_INT_TIMEZONE)
/*
* Some buggy mktime() implementations may change the
* year/month/day when given a time right at a DST boundary. To
* prevent corruption of the caller's data, give mktime() a
* copy...
*/
struct tm tt,
*tmp = &tt;
*tmp = *tm;
/* change to Unix conventions for year/month */
tmp->tm_year -= 1900;
tmp->tm_mon -= 1;
/* indicate timezone unknown */
tmp->tm_isdst = -1;
mktime(tmp);
tm->tm_isdst = tmp->tm_isdst;
#if defined(HAVE_TM_ZONE)
/* tm_gmtoff is Sun/DEC-ism */
if (tmp->tm_isdst >= 0)
tz = -(tmp->tm_gmtoff);
else
tz = 0; /* assume GMT if mktime failed */
#elif defined(HAVE_INT_TIMEZONE)
tz = ((tmp->tm_isdst > 0) ? (TIMEZONE_GLOBAL - 3600) : TIMEZONE_GLOBAL);
#endif /* HAVE_INT_TIMEZONE */
#else /* not (HAVE_TM_ZONE || HAVE_INT_TIMEZONE) */
tm->tm_isdst = 0;
tz = CTimeZone;
#endif
}
else
{
/* Given date is out of range, so assume GMT */
tm->tm_isdst = 0;
tz = 0;
}
return tz;
}
/* DecodeTimeOnly()
* Interpret parsed string as time fields only.
* 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
*/
int
DecodeTimeOnly(char **field, int *ftype, int nf,
int *dtype, struct tm * tm, double *fsec, int *tzp)
{
int fmask,
tmask,
type;
int i;
int flen,
val;
int is2digits = FALSE;
int mer = HR24;
*dtype = DTK_TIME;
tm->tm_hour = 0;
tm->tm_min = 0;
tm->tm_sec = 0;
*fsec = 0;
tm->tm_isdst = -1; /* don't know daylight savings time status
* apriori */
if (tzp != NULL)
*tzp = 0;
fmask = DTK_DATE_M;
for (i = 0; i < nf; i++)
{
switch (ftype[i])
{
case DTK_DATE:
/*
* This might be a POSIX time zone with an embedded dash
* (e.g. "PST-3" == "EST") - thomas 2000-03-15
*/
if ((tzp == NULL)
|| (DecodePosixTimezone(field[i], tzp) != 0))
return -1;
ftype[i] = DTK_TZ;
tmask = DTK_M(TZ);
break;
case DTK_TIME:
if (DecodeTime(field[i], fmask, &tmask, tm, fsec) != 0)
return -1;
break;
case DTK_TZ:
if (tzp == NULL)
return -1;
{
int tz;
if (DecodeTimezone(field[i], &tz) != 0)
return -1;
/*
* 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:
flen = strlen(field[i]);
if (DecodeNumberField(flen, field[i], fmask, &tmask, tm, fsec, &is2digits) != 0)
return -1;
break;
case DTK_STRING:
case DTK_SPECIAL:
type = DecodeSpecial(i, field[i], &val);
if (type == IGNORE)
continue;
tmask = DTK_M(type);
switch (type)
{
case RESERV:
switch (val)
{
case DTK_CURRENT:
elog(ERROR, "'CURRENT' is no longer supported");
return -1;
break;
case DTK_NOW:
tmask = DTK_TIME_M;
*dtype = DTK_TIME;
GetCurrentTimeUsec(tm, fsec);
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 -1;
}
break;
case DTZMOD:
/*
* daylight savings time modifier (solves "MET
* DST" syntax)
*/
tmask |= DTK_M(DTZ);
tm->tm_isdst = 1;
if (tzp == NULL)
return -1;
*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 -1;
*tzp = val * 60;
ftype[i] = DTK_TZ;
break;
case TZ:
tm->tm_isdst = 0;
if (tzp == NULL)
return -1;
*tzp = val * 60;
ftype[i] = DTK_TZ;
break;
case IGNORE:
break;
case AMPM:
mer = val;
break;
default:
return -1;
}
break;
default:
return -1;
}
if (tmask & fmask)
return -1;
fmask |= tmask;
}
if ((mer != HR24) && (tm->tm_hour > 12))
return -1;
if ((mer == AM) && (tm->tm_hour == 12))
tm->tm_hour = 0;
else if ((mer == PM) && (tm->tm_hour != 12))
tm->tm_hour += 12;
if (((tm->tm_hour < 0) || (tm->tm_hour > 23))
|| ((tm->tm_min < 0) || (tm->tm_min > 59))
|| ((tm->tm_sec < 0) || ((tm->tm_sec + *fsec) >= 60)))
return -1;
if ((fmask & DTK_TIME_M) != DTK_TIME_M)
return -1;
/* timezone not specified? then find local timezone if possible */
if ((tzp != NULL) && (!(fmask & DTK_M(TZ))))
{
struct tm tt,
*tmp = &tt;
/*
* daylight savings time modifier but no standard timezone? then
* error
*/
if (fmask & DTK_M(DTZMOD))
return -1;
GetCurrentTime(tmp);
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;
} /* DecodeTimeOnly() */
/* DecodeDate()
* Decode date string which includes delimiters.
* Insist on a complete set of fields.
*/
static int
DecodeDate(char *str, int fmask, int *tmask, struct tm * tm)
{
double fsec;
int nf = 0;
int i,
len;
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 -1;
#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)
continue;
dmask = DTK_M(type);
switch (type)
{
case MONTH:
tm->tm_mon = val;
break;
case ADBC:
bc = (val == BC);
break;
default:
return -1;
}
if (fmask & dmask)
return -1;
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 -1;
if (DecodeNumber(len, field[i], fmask, &dmask, tm, &fsec, &is2digits) != 0)
return -1;
if (fmask & dmask)
return -1;
fmask |= dmask;
*tmask |= dmask;
}
if ((fmask & ~(DTK_M(DOY) | DTK_M(TZ))) != DTK_DATE_M)
return -1;
/* 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
elog(ERROR, "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;
}
return 0;
} /* DecodeDate() */
/* DecodeTime()
* Decode time string which includes delimiters.
* 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 tm * tm, double *fsec)
{
char *cp;
*tmask = DTK_TIME_M;
tm->tm_hour = strtol(str, &cp, 10);
if (*cp != ':')
return -1;
str = cp + 1;
tm->tm_min = strtol(str, &cp, 10);
if (*cp == '\0')
{
tm->tm_sec = 0;
*fsec = 0;
}
else if (*cp != ':')
{
return -1;
}
else
{
str = cp + 1;
tm->tm_sec = strtol(str, &cp, 10);
if (*cp == '\0')
*fsec = 0;
else if (*cp == '.')
{
str = cp;
*fsec = strtod(str, &cp);
if (cp == str)
return -1;
}
else
return -1;
}
/* do a sanity check */
if ((tm->tm_hour < 0)
|| (tm->tm_min < 0) || (tm->tm_min > 59)
|| (tm->tm_sec < 0) || (tm->tm_sec > 59))
return -1;
return 0;
} /* DecodeTime() */
/* DecodeNumber()
* Interpret numeric field as a date value in context.
*/
static int
DecodeNumber(int flen, char *str, int fmask,
int *tmask, struct tm * tm, double *fsec, int *is2digits)
{
int val;
char *cp;
*tmask = 0;
val = strtol(str, &cp, 10);
if (cp == str)
return -1;
if (*cp == '.')
{
*fsec = strtod(cp, &cp);
if (*cp != '\0')
return -1;
}
/* Special case day of year? */
if ((flen == 3) && (fmask & DTK_M(YEAR))
&& ((val >= 1) && (val <= 366)))
{
*tmask = (DTK_M(DOY) | DTK_M(MONTH) | DTK_M(DAY));
tm->tm_yday = val;
j2date((date2j(tm->tm_year, 1, 1) + tm->tm_yday - 1),
&tm->tm_year, &tm->tm_mon, &tm->tm_mday);
}
/*
* Enough digits to be unequivocal year? Used to test for 4 digits or
* more, but we now test first for a three-digit doy so anything
* bigger than two digits had better be an explicit year. - thomas
* 1999-01-09 Back to requiring a 4 digit year. We accept a two digit
* year farther down. - thomas 2000-03-28
*/
else if (flen >= 4)
{
*tmask = DTK_M(YEAR);
/* already have a year? then see if we can substitute... */
if ((fmask & DTK_M(YEAR)) && (!(fmask & DTK_M(DAY)))
&& ((tm->tm_year >= 1) && (tm->tm_year <= 31)))
{
tm->tm_mday = tm->tm_year;
*tmask = DTK_M(DAY);
}
tm->tm_year = val;
}
/* already have year? then could be month */
else if ((fmask & DTK_M(YEAR)) && (!(fmask & DTK_M(MONTH)))
&& ((val >= 1) && (val <= 12)))
{
*tmask = DTK_M(MONTH);
tm->tm_mon = val;
}
/* no year and EuroDates enabled? then could be day */
else if ((EuroDates || (fmask & DTK_M(MONTH)))
&& (!(fmask & DTK_M(YEAR)) && !(fmask & DTK_M(DAY)))
&& ((val >= 1) && (val <= 31)))
{
*tmask = DTK_M(DAY);
tm->tm_mday = val;
}
else if ((!(fmask & DTK_M(MONTH)))
&& ((val >= 1) && (val <= 12)))
{
*tmask = DTK_M(MONTH);
tm->tm_mon = val;
}
else if ((!(fmask & DTK_M(DAY)))
&& ((val >= 1) && (val <= 31)))
{
*tmask = DTK_M(DAY);
tm->tm_mday = val;
}
/*
* Check for 2 or 4 or more digits, but currently we reach here only
* if two digits. - thomas 2000-03-28
*/
else if (!(fmask & DTK_M(YEAR))
&& ((flen >= 4) || (flen == 2)))
{
*tmask = DTK_M(YEAR);
tm->tm_year = val;
/* adjust ONLY if exactly two digits... */
*is2digits = (flen == 2);
}
else
return -1;
return 0;
} /* DecodeNumber() */
/* DecodeNumberField()
* Interpret numeric string as a concatenated date field.
*/
static int
DecodeNumberField(int len, char *str, int fmask,
int *tmask, struct tm * tm, double *fsec, int *is2digits)
{
char *cp;
/* 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);
/* yymmdd or hhmmss? */
}
else if (len == 6)
{
if (fmask & DTK_DATE_M)
{
*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);
}
else
{
*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;
}
}
else if ((len == 5) && !(fmask & DTK_DATE_M))
{
*tmask = DTK_DATE_M;
tm->tm_mday = atoi(str + 2);
*(str + 2) = '\0';
tm->tm_mon = 1;
tm->tm_year = atoi(str + 0);
*is2digits = TRUE;
}
else if (strchr(str, '.') != NULL)
{
*tmask = DTK_TIME_M;
tm->tm_sec = strtod((str + 4), &cp);
if (cp == (str + 4))
return -1;
if (*cp == '.')
*fsec = strtod(cp, NULL);
*(str + 4) = '\0';
tm->tm_min = strtod((str + 2), &cp);
*(str + 2) = '\0';
tm->tm_hour = strtod((str + 0), &cp);
}
else
return -1;
return 0;
} /* DecodeNumberField() */
/* DecodeTimezone()
* Interpret string as a numeric timezone.
*/
static int
DecodeTimezone(char *str, int *tzp)
{
int tz;
int hr,
min;
char *cp;
int len;
/* assume leading character is "+" or "-" */
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') && ((len = strlen(str)) > 3))
{
min = strtol((str + len - 2), &cp, 10);
*(str + len - 2) = '\0';
hr = strtol((str + 1), &cp, 10);
}
else
min = 0;
tz = (hr * 60 + min) * 60;
if (*str == '-')
tz = -tz;
*tzp = -tz;
return *cp != '\0';
} /* DecodeTimezone() */
/* DecodePosixTimezone()
* Interpret string as a POSIX-compatible timezone:
* PST-hh:mm
* PST+h
* - thomas 2000-03-15
*/
static int
DecodePosixTimezone(char *str, int *tzp)
{
int val,
tz;
int type;
char *cp;
char delim;
cp = str;
while ((*cp != '\0') && isalpha((unsigned char) *cp))
cp++;
if (DecodeTimezone(cp, &tz) != 0)
return -1;
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 -1;
}
return 0;
} /* DecodePosixTimezone() */
/* DecodeSpecial()
* Decode text string using lookup table.
* Implement a cache lookup since it is likely that dates
* will be related in format.
*/
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;
} /* DecodeSpecial() */
/* DecodeDateDelta()
* Interpret previously parsed fields for general time interval.
* Return 0 if decoded and -1 if problems.
*
* 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
DecodeDateDelta(char **field, int *ftype, int nf, int *dtype, struct tm * tm, double *fsec)
{
int is_before = FALSE;
char *cp;
int fmask = 0,
tmask,
type;
int i;
int val;
double fval;
double sec;
*dtype = DTK_DELTA;
type = IGNORE;
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:
if (DecodeTime(field[i], fmask, &tmask, tm, fsec) != 0)
return -1;
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)
{
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)
type = DTK_SECOND;
if (*cp == '.')
{
fval = strtod(cp, &cp);
if (*cp != '\0')
return -1;
if (val < 0)
fval = -(fval);
}
else if (*cp == '\0')
fval = 0;
else
return -1;
tmask = 0; /* DTK_M(type); */
switch (type)
{
case DTK_MICROSEC:
*fsec += ((val + fval) * 1e-6);
break;
case DTK_MILLISEC:
*fsec += ((val + fval) * 1e-3);
break;
case DTK_SECOND:
tm->tm_sec += val;
*fsec += fval;
tmask = DTK_M(SECOND);
break;
case DTK_MINUTE:
tm->tm_min += val;
if (fval != 0)
tm->tm_sec += (fval * 60);
tmask = DTK_M(MINUTE);
break;
case DTK_HOUR:
tm->tm_hour += val;
if (fval != 0)
tm->tm_sec += (fval * 3600);
tmask = DTK_M(HOUR);
break;
case DTK_DAY:
tm->tm_mday += val;
if (fval != 0)
tm->tm_sec += (fval * 86400);
tmask = ((fmask & DTK_M(DAY)) ? 0 : DTK_M(DAY));
break;
case DTK_WEEK:
tm->tm_mday += val * 7;
if (fval != 0)
tm->tm_sec += (fval * (7 * 86400));
tmask = ((fmask & DTK_M(DAY)) ? 0 : DTK_M(DAY));
break;
case DTK_MONTH:
tm->tm_mon += val;
if (fval != 0)
tm->tm_sec += (fval * (30 * 86400));
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 -1;
}
break;
case DTK_STRING:
case DTK_SPECIAL:
type = DecodeUnits(i, field[i], &val);
if (type == IGNORE)
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 -1;
}
break;
default:
return -1;
}
if (tmask & fmask)
return -1;
fmask |= tmask;
}
if (*fsec != 0)
{
TMODULO(*fsec, sec, 1e0);
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 */
return (fmask != 0) ? 0 : -1;
} /* DecodeDateDelta() */
/* 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() */
/* 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 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 (EuroDates)
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 (EuroDates)
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 tm * tm, double fsec, int *tzp, int style, char *str)
{
double sec;
if ((tm->tm_hour < 0) || (tm->tm_hour > 24))
return -1;
sec = (tm->tm_sec + fsec);
sprintf(str, "%02d:%02d", tm->tm_hour, tm->tm_min);
/*
* If we have fractional seconds, then include a decimal point We will
* do up to 6 fractional digits, and we have rounded any inputs to
* eliminate anything to the right of 6 digits anyway. If there are no
* fractional seconds, then do not bother printing a decimal point at
* all. - thomas 2001-09-29
*/
if (fsec != 0)
{
sprintf((str + strlen(str)), ":%013.10f", sec);
/* 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)), ":%02.0f", 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 tm * tm, double fsec, int *tzp, char **tzn, int style, char *str)
{
int day,
hour,
min;
double sec;
if ((tm->tm_mon < 1) || (tm->tm_mon > 12))
return -1;
sec = (tm->tm_sec + fsec);
switch (style)
{
/* compatible with ISO date formats */
case USE_ISO_DATES:
if (tm->tm_year > 0)
{
sprintf(str, "%04d-%02d-%02d %02d:%02d",
tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min);
/*
* If we have fractional seconds, then include a decimal
* point We will do up to 6 fractional digits, and we have
* rounded any inputs to eliminate anything to the right
* of 6 digits anyway. If there are no fractional seconds,
* then do not bother printing a decimal point at all. -
* thomas 2001-09-29
*/
if (fsec != 0)
{
sprintf((str + strlen(str)), ":%013.10f", sec);
TrimTrailingZeros(str);
}
else
sprintf((str + strlen(str)), ":%02.0f", sec);
/*
* 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);
}
}
else
{
if (tm->tm_hour || tm->tm_min)
sprintf(str, "%04d-%02d-%02d %02d:%02d %s",
-(tm->tm_year - 1), tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min, "BC");
else
sprintf(str, "%04d-%02d-%02d %s",
-(tm->tm_year - 1), tm->tm_mon, tm->tm_mday, "BC");
}
break;
/* compatible with Oracle/Ingres date formats */
case USE_SQL_DATES:
if (EuroDates)
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 %02d:%02d",
tm->tm_year, tm->tm_hour, tm->tm_min);
/*
* If we have fractional seconds, then include a decimal
* point We will do up to 6 fractional digits, and we have
* rounded any inputs to eliminate anything to the right
* of 6 digits anyway. If there are no fractional seconds,
* then do not bother printing a decimal point at all. -
* thomas 2001-09-29
*/
if (fsec != 0)
{
sprintf((str + strlen(str)), ":%013.10f", sec);
TrimTrailingZeros(str);
}
else
sprintf((str + strlen(str)), ":%02.0f", sec);
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);
}
}
}
else
sprintf((str + 5), "/%04d %02d:%02d %s",
-(tm->tm_year - 1), tm->tm_hour, tm->tm_min, "BC");
break;
/* German variant on European style */
case USE_GERMAN_DATES:
sprintf(str, "%02d.%02d", tm->tm_mday, tm->tm_mon);
if (tm->tm_year > 0)
{
sprintf((str + 5), ".%04d %02d:%02d",
tm->tm_year, tm->tm_hour, tm->tm_min);
/*
* If we have fractional seconds, then include a decimal
* point We will do up to 6 fractional digits, and we have
* rounded any inputs to eliminate anything to the right
* of 6 digits anyway. If there are no fractional seconds,
* then do not bother printing a decimal point at all. -
* thomas 2001-09-29
*/
if (fsec != 0)
{
sprintf((str + strlen(str)), ":%013.10f", sec);
TrimTrailingZeros(str);
}
else
sprintf((str + strlen(str)), ":%02.0f", sec);
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);
}
}
}
else
sprintf((str + 5), ".%04d %02d:%02d %s",
-(tm->tm_year - 1), tm->tm_hour, tm->tm_min, "BC");
break;
/* backward-compatible with traditional Postgres abstime dates */
case USE_POSTGRES_DATES:
default:
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 (EuroDates)
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);
if (tm->tm_year > 0)
{
sprintf((str + 10), " %02d:%02d", tm->tm_hour, tm->tm_min);
/*
* If we have fractional seconds, then include a decimal
* point We will do up to 6 fractional digits, and we have
* rounded any inputs to eliminate anything to the right
* of 6 digits anyway. If there are no fractional seconds,
* then do not bother printing a decimal point at all. -
* thomas 2001-09-29
*/
if (fsec != 0)
{
sprintf((str + strlen(str)), ":%013.10f", sec);
TrimTrailingZeros(str);
}
else
sprintf((str + strlen(str)), ":%02.0f", sec);
sprintf((str + strlen(str)), " %04d", tm->tm_year);
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);
}
}
}
else
{
sprintf((str + 10), " %02d:%02d %04d %s",
tm->tm_hour, tm->tm_min, -(tm->tm_year - 1), "BC");
}
break;
}
return TRUE;
} /* EncodeDateTime() */
/* EncodeTimeSpan()
* 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
EncodeTimeSpan(struct tm * tm, double 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;
/* fractional seconds? */
if (fsec != 0)
{
fsec += tm->tm_sec;
sprintf(cp, ":%013.10f", fabs(fsec));
TrimTrailingZeros(cp);
cp += strlen(cp);
is_nonzero = TRUE;
}
/* otherwise, integer seconds only? */
else if (tm->tm_sec != 0)
{
sprintf(cp, ":%02d", abs(tm->tm_sec));
cp += strlen(cp);
is_nonzero = TRUE;
}
}
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)
{
double 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);
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;
} /* EncodeTimeSpan() */
void
ClearDateCache(bool dummy)
{
int i;
for (i = 0; i < MAXDATEFIELDS; i++)
datecache[i] = NULL;
}
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