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openGauss-server/src/common/backend/utils/adt/datetime.cpp

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/* -------------------------------------------------------------------------
*
* datetime.c
* Support functions for date/time types.
*
* Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/backend/utils/adt/datetime.c
*
* -------------------------------------------------------------------------
*/
#include "postgres.h"
#include "knl/knl_variable.h"
#include <ctype.h>
#include <float.h>
#include <limits.h>
#include <math.h>
#include "access/xact.h"
#include "catalog/pg_type.h"
#include "common/int.h"
#include "funcapi.h"
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "utils/builtins.h"
#include "utils/date.h"
#include "utils/datetime.h"
#include "utils/memutils.h"
#include "utils/tzparser.h"
#include "parser/scansup.h"
static int DecodeNumber(int flen, char* field, bool haveTextMonth, unsigned int fmask, unsigned int* tmask,
struct pg_tm* tm, fsec_t* fsec, bool* is2digits);
static int DecodeNumberField(
int len, char* str, unsigned int fmask, unsigned int* tmask, struct pg_tm* tm, fsec_t* fsec, bool* is2digits);
static int DecodeTime(
const char* str, unsigned int fmask, int range, unsigned int* tmask, struct pg_tm* tm, fsec_t* fsec);
static int DecodeTimezone(const char* str, int* tzp);
static const datetkn* datebsearch(const char* key, const datetkn* base, int nel);
static int DecodeDate(char* str, unsigned int fmask, unsigned int* tmask, bool* is2digits, struct pg_tm* tm);
static int ValidateDate(unsigned int fmask, bool isjulian, bool is2digits, bool bc, struct pg_tm* tm);
static void AppendTrailingZeros(char* str);
#ifndef HAVE_INT64_TIMESTAMP
static char* TrimTrailingZeros(char* str);
#endif /* HAVE_INT64_TIMESTAMP */
static char* AppendSeconds(char* cp, int sec, fsec_t fsec, int precision, bool fillzeros);
static void AdjustFractSeconds(double frac, struct pg_tm* tm, fsec_t* fsec, int scale);
static void AdjustFractDays(double frac, struct pg_tm* tm, fsec_t* fsec, int scale);
const 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))
static const datetkn datetktbl[] = {
/* text, token, lexval */
{EARLY, RESERV, DTK_EARLY}, /* "-infinity" reserved for "early time" */
{DA_D, ADBC, AD}, /* "ad" for years > 0 */
{"allballs", RESERV, DTK_ZULU}, /* 00:00:00 */
{"am", AMPM, AM},
{"apr", MONTH, 4},
{"april", MONTH, 4},
{"at", IGNORE_DTF, 0}, /* "at" (throwaway) */
{"aug", MONTH, 8},
{"august", MONTH, 8},
{DB_C, ADBC, BC}, /* "bc" for years <= 0 */
{DCURRENT, RESERV, DTK_CURRENT}, /* "current" is always now */
{"d", UNITS, DTK_DAY}, /* "day of month" for ISO input */
{"dec", MONTH, 12},
{"december", MONTH, 12},
{"dow", UNITS, DTK_DOW}, /* day of week */
{"doy", UNITS, DTK_DOY}, /* day of year */
{"dst", DTZMOD, 6},
{EPOCH, RESERV, DTK_EPOCH}, /* "epoch" reserved for system epoch time */
{"feb", MONTH, 2},
{"february", MONTH, 2},
{"fri", DOW, 5},
{"friday", DOW, 5},
{"h", UNITS, DTK_HOUR}, /* "hour" */
{LATE, RESERV, DTK_LATE}, /* "infinity" reserved for "late time" */
{INVALID, RESERV, DTK_INVALID}, /* "invalid" reserved for bad time */
{"isodow", UNITS, DTK_ISODOW}, /* ISO day of week, Sunday == 7 */
{"isoyear", UNITS, DTK_ISOYEAR}, /* year in terms of the ISO week date */
{"j", UNITS, DTK_JULIAN},
{"jan", MONTH, 1},
{"january", MONTH, 1},
{"jd", UNITS, DTK_JULIAN},
{"jul", MONTH, 7},
{"julian", UNITS, DTK_JULIAN},
{"july", MONTH, 7},
{"jun", MONTH, 6},
{"june", MONTH, 6},
{"m", UNITS, DTK_MONTH}, /* "month" for ISO input */
{"mar", MONTH, 3},
{"march", MONTH, 3},
{"may", MONTH, 5},
{"mm", UNITS, DTK_MINUTE}, /* "minute" for ISO input */
{"mon", DOW, 1},
{"monday", DOW, 1},
{"nov", MONTH, 11},
{"november", MONTH, 11},
{NOW, RESERV, DTK_NOW}, /* current transaction time */
{"oct", MONTH, 10},
{"october", MONTH, 10},
{"on", IGNORE_DTF, 0}, /* "on" (throwaway) */
{"pm", AMPM, PM},
{"s", UNITS, DTK_SECOND}, /* "seconds" for ISO input */
{"sat", DOW, 6},
{"saturday", DOW, 6},
{"sep", MONTH, 9},
{"sept", MONTH, 9},
{"september", MONTH, 9},
{"sun", DOW, 0},
{"sunday", DOW, 0},
{"t", ISOTIME, DTK_TIME}, /* Filler for ISO time fields */
{"thu", DOW, 4},
{"thur", DOW, 4},
{"thurs", DOW, 4},
{"thursday", DOW, 4},
{TODAY, RESERV, DTK_TODAY}, /* midnight */
{TOMORROW, RESERV, DTK_TOMORROW}, /* tomorrow midnight */
{"tue", DOW, 2},
{"tues", DOW, 2},
{"tuesday", DOW, 2},
{"undefined", RESERV, DTK_INVALID}, /* pre-v6.1 invalid time */
{"wed", DOW, 3},
{"wednesday", DOW, 3},
{"weds", DOW, 3},
{"y", UNITS, DTK_YEAR}, /* "year" for ISO input */
{YESTERDAY, RESERV, DTK_YESTERDAY} /* yesterday midnight */
};
static int szdatetktbl = sizeof datetktbl / sizeof datetktbl[0];
static datetkn deltatktbl[] = {
/* text, token, lexval */
{"@", IGNORE_DTF, 0}, /* openGauss relative prefix */
{DAGO, AGO, 0}, /* "ago" indicates negative time offset */
{"c", UNITS, DTK_CENTURY}, /* "century" relative */
{"cc", 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 */
{"dd", UNITS, DTK_DAY}, /* "day" relative */
{"ddd", UNITS, DTK_DAY}, /* "day" 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 */
{"hh", 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 */
{"j", UNITS, DTK_DAY}, /* "day" relative */
{"m", UNITS, DTK_MINUTE}, /* "minute" relative */
{"mi", 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 */
{"mm", UNITS, DTK_MONTH}, /* "month" 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},
{"q", UNITS, DTK_QUARTER}, /* "quarter" relative */
{"qtr", UNITS, DTK_QUARTER}, /* "quarter" relative */
{DQUARTER, UNITS, DTK_QUARTER}, /* "quarter" relative */
{"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 */
{"yyyy", UNITS, DTK_YEAR} /* "year" relative */
};
static int szdeltatktbl = sizeof deltatktbl / sizeof deltatktbl[0];
/*
* strtoi --- just like strtol, but returns int not long
*/
static int strtoi(const char* nptr, char** endptr, int base)
{
long val;
val = strtol(nptr, endptr, base);
#ifdef HAVE_LONG_INT_64
if (val != (long)((int32)val))
errno = ERANGE;
#endif
return (int)val;
}
/*
* 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) % MONTHS_PER_YEAR + 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() */
/*
* GetCurrentDateTime()
*
* Get the transaction start time ("now()") broken down as a struct pg_tm.
*/
void GetCurrentDateTime(struct pg_tm* tm)
{
int tz;
fsec_t fsec;
timestamp2tm(GetCurrentTransactionStartTimestamp(), &tz, tm, &fsec, NULL, NULL);
/* Note: don't pass NULL tzp to timestamp2tm; affects behavior */
}
/*
* GetCurrentTimeUsec()
*
* Get the transaction start time ("now()") broken down as a struct pg_tm,
* including fractional seconds and timezone offset.
*
* Internally, we cache the result, since this could be called many times
* in a transaction, within which now() doesn't change.
*/
void GetCurrentTimeUsec(struct pg_tm* tm, fsec_t* fsec, int* tzp)
{
TimestampTz cur_ts = GetCurrentTransactionStartTimestamp();
/*
* The cache key must include both current time and current timezone.
* By representing the timezone by just a pointer, we're assuming that
* distinct timezone settings could never have the same pointer value.
* This is true by virtue of the hashtable used inside pg_tzset();
* however, it might need another look if we ever allow entries in that
* hash to be recycled.
*/
if (cur_ts != u_sess->cache_ts || session_timezone != u_sess->cache_timezone) {
/*
* Make sure cache is marked invalid in case of error after partial
* update within timestamp2tm.
*/
u_sess->cache_timezone = NULL;
/*
* Perform the computation, storing results into cache. We do not
* really expect any error here, since current time surely ought to be
* within range, but check just for sanity's sake.
*/
if (timestamp2tm(cur_ts,
&u_sess->cache_tz, &u_sess->cache_tm, &u_sess->cache_fsec,
NULL, session_timezone) != 0) {
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("timestamp out of range")));
}
/* OK, so mark the cache valid. */
u_sess->cache_ts = cur_ts;
u_sess->cache_timezone = session_timezone;
}
*tm = u_sess->cache_tm;
*fsec = u_sess->cache_fsec;
if (tzp != NULL) {
*tzp = u_sess->cache_tz;
}
}
/* TrimTrailingZeros()
* ... resulting from printing numbers with full precision.
*
* Returns a pointer to the new end of string. No NUL terminator is put
* there; callers are responsible for NUL terminating str themselves.
*
* Before Postgres 8.4, this always left at least 2 fractional digits,
* but conversations on the lists suggest this isn't desired
* since showing '0.10' is misleading with values of precision(1).
*/
#ifndef HAVE_INT64_TIMESTAMP
static char* TrimTrailingZeros(char* str)
{
int len = strlen(str);
while (len > 1 && *(str + len - 1) == '0' && *(str + len - 2) != '.') {
len--;
}
return str + len;
}
#endif
/*
* Append seconds and fractional seconds (if any) at *cp.
*
* precision is the max number of fraction digits, fillzeros says to
* pad to two integral-seconds digits.
*
* Returns a pointer to the new end of string. No NUL terminator is put
* there; callers are responsible for NUL terminating str themselves.
*
* Note that any sign is stripped from the input seconds values.
*/
static char* AppendSeconds(char* cp, int sec, fsec_t fsec, int precision, bool fillzeros)
{
Assert(precision >= 0);
#ifdef HAVE_INT64_TIMESTAMP
/* fsec_t is just an int32 */
if (fillzeros)
cp = pg_ultostr_zeropad(cp, Abs(sec), 2);
else
cp = pg_ultostr(cp, Abs(sec));
if (fsec != 0)
{
int32 value = Abs(fsec);
char *end = &cp[precision + 1];
bool gotnonzero = false;
*cp++ = '.';
/*
* Append the fractional seconds part. Note that we don't want any
* trailing zeros here, so since we're building the number in reverse
* we'll skip appending zeros until we've output a non-zero digit.
*/
while (precision--)
{
int32 oldval = value;
int32 remainder;
value /= 10;
remainder = oldval - value * 10;
/* check if we got a non-zero */
if (remainder)
gotnonzero = true;
if (gotnonzero)
cp[precision] = '0' + remainder;
else
end = &cp[precision];
}
/*
* If we still have a non-zero value then precision must have not been
* enough to print the number. We punt the problem to pg_ultostr(),
* which will generate a correct answer in the minimum valid width.
*/
if (value)
return pg_ultostr(cp, Abs(fsec));
return end;
}
else
return cp;
#else
/* fsec_t is a double */
if (fsec == 0)
{
if (fillzeros)
return pg_ultostr_zeropad(cp, Abs(sec), 2);
else
return pg_ultostr(cp, Abs(sec));
}
else
{
if (fillzeros)
rc = sprintf_s(cp, MAXDATELEN, "%0*.*f", precision + 3, precision, fabs(sec + fsec));
else
rc = sprintf_s(cp, MAXDATELEN, "%.*f", precision, fabs(sec + fsec));
securec_check_ss(rc, "\0", "\0");
return TrimTrailingZeros(cp);
}
#endif /* HAVE_INT64_TIMESTAMP */
}
/*
* Variant of above that's specialized to timestamp case.
*
* Returns a pointer to the new end of string. No NUL terminator is put
* there; callers are responsible for NUL terminating str themselves.
*/
static char* AppendTimestampSeconds(char* cp, struct pg_tm* tm, fsec_t fsec)
{
/*
* In float mode, don't print fractional seconds before 1 AD, since it's
* unlikely there's any precision left ...
*/
#ifndef HAVE_INT64_TIMESTAMP
if (tm->tm_year <= 0)
fsec = 0;
#endif
return AppendSeconds(cp, tm->tm_sec, fsec, MAX_TIMESTAMP_PRECISION, true);
}
/*
* Multiply frac by scale (to produce seconds) and add to *tm & *fsec.
* We assume the input frac is less than 1 so overflow is not an issue.
*/
static void AdjustFractSeconds(double frac, struct pg_tm* tm, fsec_t* fsec, int scale)
{
int sec;
if (frac == 0)
return;
frac *= scale;
sec = (int)frac;
tm->tm_sec += sec;
frac -= sec;
#ifdef HAVE_INT64_TIMESTAMP
*fsec += rint(frac * 1000000);
#else
*fsec += frac;
#endif
}
/* As above, but initial scale produces days */
static void AdjustFractDays(double frac, struct pg_tm* tm, fsec_t* fsec, int scale)
{
int extra_days;
if (frac == 0)
return;
frac *= scale;
extra_days = (int)frac;
tm->tm_mday += extra_days;
frac -= extra_days;
AdjustFractSeconds(frac, tm, fsec, SECS_PER_DAY);
}
/* Fetch a fractional-second value with suitable error checking */
static int ParseFractionalSecond(char* cp, fsec_t* fsec)
{
double frac;
/* Caller should always pass the start of the fraction part */
Assert(*cp == '.');
errno = 0;
frac = strtod(cp, &cp);
/* check for parse failure */
if (*cp != '\0' || errno != 0)
return DTERR_BAD_FORMAT;
#ifdef HAVE_INT64_TIMESTAMP
*fsec = rint(frac * 1000000);
#else
*fsec = frac;
#endif
return 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
* workbuf - workspace for field string storage. This must be
* larger than the largest legal input for this datetime type --
* some additional space will be needed to NUL terminate fields.
* buflen - the size of workbuf
* 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 workbuf. 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 or punctuation)
* DTK_SPECIAL - leading "+" or "-" followed by text
* DTK_TZ - leading "+" or "-" followed by digits (also eats ':', '.', '-')
*
* 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 time zone names (America/New_York, GMT-8)
*/
int ParseDateTime(
const char* timestr, char* workbuf, size_t buflen, char** field, int* ftype, int maxfields, int* numfields)
{
int nf = 0;
const char* cp = timestr;
char* bufp = workbuf;
const char* bufend = workbuf + buflen;
/*
* Set the character pointed-to by "bufptr" to "newchar", and increment
* "bufptr". "end" gives the end of the buffer -- we return an error if
* there is no space left to append a character to the buffer. Note that
* "bufptr" is evaluated twice.
*/
#define APPEND_CHAR(bufptr, end, newchar) \
do { \
if (((bufptr) + 1) >= (end)) \
return DTERR_BAD_FORMAT; \
*(bufptr)++ = newchar; \
} while (0)
/* 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] = bufp;
/* leading digit? then date or time */
if (isdigit((unsigned char)*cp)) {
APPEND_CHAR(bufp, bufend, *cp++);
while (isdigit((unsigned char)*cp)) {
APPEND_CHAR(bufp, bufend, *cp++);
}
/* time field? */
if (*cp == ':') {
ftype[nf] = DTK_TIME;
APPEND_CHAR(bufp, bufend, *cp++);
while (isdigit((unsigned char)*cp) || (*cp == ':') || (*cp == '.')) {
APPEND_CHAR(bufp, bufend, *cp++);
}
}
/* date field? allow embedded text month */
else if (*cp == '-' || *cp == '/' || *cp == '.') {
/* save delimiting character to use later */
char delim = *cp;
APPEND_CHAR(bufp, bufend, *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)) {
APPEND_CHAR(bufp, bufend, *cp++);
}
/*
* insist that the delimiters match to get a three-field
* date.
*/
if (*cp == delim) {
ftype[nf] = DTK_DATE;
APPEND_CHAR(bufp, bufend, *cp++);
while (isdigit((unsigned char)*cp) || *cp == delim) {
APPEND_CHAR(bufp, bufend, *cp++);
}
}
} else {
ftype[nf] = DTK_DATE;
while (isalnum((unsigned char)*cp) || *cp == delim) {
APPEND_CHAR(bufp, bufend, 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 == '.') {
APPEND_CHAR(bufp, bufend, *cp++);
while (isdigit((unsigned char)*cp)) {
APPEND_CHAR(bufp, bufend, *cp++);
}
ftype[nf] = DTK_NUMBER;
}
/*
* text? then date string, month, day of week, special, or timezone
*/
else if (isalpha((unsigned char)*cp)) {
bool is_date = false;
ftype[nf] = DTK_STRING;
APPEND_CHAR(bufp, bufend, pg_tolower((unsigned char)*cp++));
while (isalpha((unsigned char)*cp)) {
APPEND_CHAR(bufp, bufend, pg_tolower((unsigned char)*cp++));
}
/*
* Dates can have embedded '-', '/', or '.' separators. It could
* also be a timezone name containing embedded '/', '+', '-', '_',
* or ':' (but '_' or ':' can't be the first punctuation). If the
* next character is a digit or '+', we need to check whether what
* we have so far is a recognized non-timezone keyword --- if so,
* don't believe that this is the start of a timezone.
*/
is_date = false;
if (*cp == '-' || *cp == '/' || *cp == '.')
is_date = true;
else if (*cp == '+' || isdigit((unsigned char)*cp)) {
*bufp = '\0'; /* null-terminate current field value */
/* we need search only the core token table, not TZ names */
if (datebsearch(field[nf], datetktbl, szdatetktbl) == NULL)
is_date = true;
}
if (is_date) {
ftype[nf] = DTK_DATE;
do {
APPEND_CHAR(bufp, bufend, pg_tolower((unsigned char)*cp++));
} while (*cp == '+' || *cp == '-' || *cp == '/' || *cp == '_' || *cp == '.' || *cp == ':' ||
isalnum((unsigned char)*cp));
}
}
/* sign? then special or numeric timezone */
else if (*cp == '+' || *cp == '-') {
APPEND_CHAR(bufp, bufend, *cp++);
/* soak up leading whitespace */
while (isspace((unsigned char)*cp)) {
cp++;
}
/* numeric timezone? */
/* note that "DTK_TZ" could also be a signed float or yyyy-mm */
if (isdigit((unsigned char)*cp)) {
ftype[nf] = DTK_TZ;
APPEND_CHAR(bufp, bufend, *cp++);
while (isdigit((unsigned char)*cp) || *cp == ':' || *cp == '.' || *cp == '-') {
APPEND_CHAR(bufp, bufend, *cp++);
}
}
/* special? */
else if (isalpha((unsigned char)*cp)) {
ftype[nf] = DTK_SPECIAL;
APPEND_CHAR(bufp, bufend, pg_tolower((unsigned char)*cp++));
while (isalpha((unsigned char)*cp)) {
APPEND_CHAR(bufp, bufend, 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 */
*bufp++ = '\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 range of pg_time_t (in practice that could only
* happen if pg_time_t is just 32 bits), 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)
{
unsigned int fmask = 0, tmask;
int type;
int ptype = 0; /* "prefix type" for ISO y2001m02d04 format */
int i;
int val;
int dterr;
int mer = HR24;
bool haveTextMonth = FALSE;
bool isjulian = FALSE;
bool is2digits = FALSE;
bool bc = FALSE;
pg_tz* namedTz = NULL;
struct pg_tm cur_tm;
/*
* 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 = NULL;
int val;
if (tzp == NULL)
return DTERR_BAD_FORMAT;
errno = 0;
val = strtoi(field[i], &cp, 10);
if (errno == ERANGE || val < 0)
return DTERR_FIELD_OVERFLOW;
j2date(val, &tm->tm_year, &tm->tm_mon, &tm->tm_mday);
isjulian = TRUE;
/* 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 time zone name
* with embedded punctuation (e.g. "America/New_York") or a
* run-together time with trailing time zone (e.g. hhmmss-zz).
* - thomas 2001-12-25
*
* We consider it a time zone if we already have month & day.
* This is to allow the form "mmm dd hhmmss tz year", which
* we've historically accepted.
***/
else if (ptype != 0 || ((fmask & (DTK_M(MONTH) | DTK_M(DAY))) == (DTK_M(MONTH) | DTK_M(DAY)))) {
/* No time zone accepted? Then quit... */
if (tzp == NULL)
return DTERR_BAD_FORMAT;
if (isdigit((unsigned char)*field[i]) || ptype != 0) {
char* cp = NULL;
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;
/*
* modify tmask after returning from
* DecodeNumberField()
*/
tmask |= DTK_M(TZ);
} else {
namedTz = pg_tzset(field[i]);
if (NULL == namedTz) {
/*
* We should return an error code instead of
* ereport'ing directly, but then there is no way
* to report the bad time zone name.
*/
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("time zone \"%s\" not recognized", field[i])));
}
/* we'll apply the zone setting below */
tmask = DTK_M(TZ);
}
} else {
dterr = DecodeDate(field[i], fmask, &tmask, &is2digits, tm);
if (dterr)
return dterr;
}
break;
case DTK_TIME:
dterr = DecodeTime(field[i], fmask, INTERVAL_FULL_RANGE, &tmask, tm, fsec);
if (dterr)
return dterr;
/*
* Check upper limit on hours; other limits checked in
* DecodeTime()
*/
/* test for > 24:00:00 */
if (tm->tm_hour > HOURS_PER_DAY ||
(tm->tm_hour == HOURS_PER_DAY && (tm->tm_min > 0 || tm->tm_sec > 0 || *fsec > 0)))
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;
*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 = NULL;
int val;
errno = 0;
val = strtoi(field[i], &cp, 10);
if (errno == ERANGE)
return DTERR_FIELD_OVERFLOW;
/*
* 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 == '.') {
dterr = ParseFractionalSecond(cp, fsec);
if (dterr)
return dterr;
tmask = DTK_ALL_SECS_M;
}
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" */
if (val < 0)
return DTERR_FIELD_OVERFLOW;
tmask = DTK_DATE_M;
j2date(val, &tm->tm_year, &tm->tm_mon, &tm->tm_mday);
isjulian = TRUE;
/* fractional Julian Day? */
if (*cp == '.') {
double time;
errno = 0;
time = strtod(cp, &cp);
if (*cp != '\0' || errno != 0)
return DTERR_BAD_FORMAT;
#ifdef HAVE_INT64_TIMESTAMP
time *= USECS_PER_DAY;
#else
time *= SECS_PER_DAY;
#endif
dt2time(time, &tm->tm_hour, &tm->tm_min, &tm->tm_sec, fsec);
tmask |= DTK_TIME_M;
}
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;
if (tmask != DTK_TIME_M)
return DTERR_BAD_FORMAT;
break;
default:
return DTERR_BAD_FORMAT;
break;
}
ptype = 0;
*dtype = DTK_DATE;
} else {
char* cp = NULL;
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, &is2digits, 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;
} else if (flen > 4) {
dterr = DecodeNumberField(flen, field[i], fmask, &tmask, tm, fsec, &is2digits);
if (dterr < 0)
return 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(&cur_tm);
j2date(date2j(cur_tm.tm_year, cur_tm.tm_mon, cur_tm.tm_mday) - 1,
&tm->tm_year,
&tm->tm_mon,
&tm->tm_mday);
break;
case DTK_TODAY:
tmask = DTK_DATE_M;
*dtype = DTK_DATE;
GetCurrentDateTime(&cur_tm);
tm->tm_year = cur_tm.tm_year;
tm->tm_mon = cur_tm.tm_mon;
tm->tm_mday = cur_tm.tm_mday;
break;
case DTK_TOMORROW:
tmask = DTK_DATE_M;
*dtype = DTK_DATE;
GetCurrentDateTime(&cur_tm);
j2date(date2j(cur_tm.tm_year, cur_tm.tm_mon, cur_tm.tm_mday) + 1,
&tm->tm_year,
&tm->tm_mon,
&tm->tm_mday);
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;
}
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 * MINS_PER_HOUR;
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 * MINS_PER_HOUR;
break;
case TZ:
tm->tm_isdst = 0;
if (tzp == NULL)
return DTERR_BAD_FORMAT;
*tzp = val * MINS_PER_HOUR;
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;
case UNKNOWN_FIELD:
/*
* Before giving up and declaring error, check to see
* if it is an all-alpha timezone name.
*/
namedTz = pg_tzset(field[i]);
if (NULL == namedTz)
return DTERR_BAD_FORMAT;
/* we'll apply the zone setting below */
tmask = DTK_M(TZ);
break;
default:
return DTERR_BAD_FORMAT;
}
break;
default:
return DTERR_BAD_FORMAT;
}
if (tmask & fmask)
return DTERR_BAD_FORMAT;
fmask |= tmask;
} /* end loop over fields */
/* do final checking/adjustment of Y/M/D fields */
dterr = ValidateDate(fmask, isjulian, is2digits, bc, tm);
if (dterr)
return dterr;
/* handle AM/PM */
if (mer != HR24 && tm->tm_hour > HOURS_PER_DAY / 2)
return DTERR_FIELD_OVERFLOW;
if (mer == AM && tm->tm_hour == HOURS_PER_DAY / 2)
tm->tm_hour = 0;
else if (mer == PM && tm->tm_hour != HOURS_PER_DAY / 2)
tm->tm_hour += HOURS_PER_DAY / 2;
/* 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;
}
/*
* If we had a full timezone spec, compute the offset (we could not do
* it before, because we need the date to resolve DST status).
*/
if (namedTz != NULL && tzp != NULL) {
/* daylight savings time modifier disallowed with full TZ */
if (fmask & DTK_M(DTZMOD))
return DTERR_BAD_FORMAT;
*tzp = DetermineTimeZoneOffset(tm, namedTz);
}
/* 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 = DetermineTimeZoneOffset(tm, session_timezone);
}
}
return 0;
}
/* DetermineTimeZoneOffset()
*
* 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 time 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: it might seem that we should use mktime() for this, but bitter
* experience teaches otherwise. This code is much faster than most versions
* of mktime(), anyway.
*/
int DetermineTimeZoneOffset(struct pg_tm* tm, pg_tz* tzp)
{
int date, sec;
pg_time_t day, mytime, prevtime, boundary, beforetime, aftertime;
long int before_gmtoff, after_gmtoff;
int before_isdst, after_isdst;
int res;
if (tzp == session_timezone && u_sess->time_cxt.HasCTZSet) {
tm->tm_isdst = 0; /* for lack of a better idea */
return u_sess->time_cxt.CTimeZone;
}
/*
* First, generate the pg_time_t value corresponding to the given
* y/m/d/h/m/s taken as GMT time. If this overflows, punt and decide the
* timezone is GMT. (We only need to worry about overflow on machines
* where pg_time_t is 32 bits.)
*/
if (!IS_VALID_JULIAN(tm->tm_year, tm->tm_mon, tm->tm_mday))
goto overflow;
date = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - UNIX_EPOCH_JDATE;
day = ((pg_time_t)date) * SECS_PER_DAY;
if (day / SECS_PER_DAY != date)
goto overflow;
sec = tm->tm_sec + (tm->tm_min + tm->tm_hour * MINS_PER_HOUR) * SECS_PER_MINUTE;
mytime = day + sec;
/* since sec >= 0, overflow could only be from +day to -mytime */
if (mytime < 0 && day > 0)
goto overflow;
/*
* Find the DST time boundary just before or following the target time. We
* assume that all zones have GMT offsets less than 24 hours, and that DST
* boundaries can't be closer together than 48 hours, so backing up 24
* hours and finding the "next" boundary will work.
*/
prevtime = mytime - SECS_PER_DAY;
if (mytime < 0 && prevtime > 0)
goto overflow;
res = pg_next_dst_boundary(&prevtime, &before_gmtoff, &before_isdst, &boundary, &after_gmtoff, &after_isdst, tzp);
if (res < 0)
goto overflow; /* failure? */
if (res == 0) {
/* Non-DST zone, life is simple */
tm->tm_isdst = before_isdst;
return -(int)before_gmtoff;
}
/*
* Form the candidate pg_time_t values with local-time adjustment
*/
beforetime = mytime - before_gmtoff;
if ((before_gmtoff > 0 && mytime < 0 && beforetime > 0) || (before_gmtoff <= 0 && mytime > 0 && beforetime < 0))
goto overflow;
aftertime = mytime - after_gmtoff;
if ((after_gmtoff > 0 && mytime < 0 && aftertime > 0) || (after_gmtoff <= 0 && mytime > 0 && aftertime < 0))
goto overflow;
/*
* If both before or both after the boundary time, we know what to do
*/
if (beforetime <= boundary && aftertime < boundary) {
tm->tm_isdst = before_isdst;
return -(int)before_gmtoff;
}
if (beforetime > boundary && aftertime >= boundary) {
tm->tm_isdst = after_isdst;
return -(int)after_gmtoff;
}
/*
* It's an invalid or ambiguous time due to timezone transition. Prefer
* the standard-time interpretation.
*/
if (after_isdst == 0) {
tm->tm_isdst = after_isdst;
return -(int)after_gmtoff;
}
tm->tm_isdst = before_isdst;
return -(int)before_gmtoff;
overflow:
/* Given date is out of range, so assume UTC */
tm->tm_isdst = 0;
return 0;
}
/* 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)
{
unsigned int fmask = 0, tmask;
int type;
int ptype = 0; /* "prefix type" for ISO h04mm05s06 format */
int i;
int val;
int dterr;
bool isjulian = FALSE;
bool is2digits = FALSE;
bool bc = FALSE;
int mer = HR24;
pg_tz* namedTz = NULL;
*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, &is2digits, tm);
if (dterr)
return dterr;
}
/* otherwise, this is a time and/or time zone */
else {
if (isdigit((unsigned char)*field[i])) {
char* cp = NULL;
/*
* 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 {
namedTz = pg_tzset(field[i]);
if (NULL == namedTz) {
/*
* We should return an error code instead of
* ereport'ing directly, but then there is no way
* to report the bad time zone name.
*/
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("time zone \"%s\" not recognized", field[i])));
}
/* we'll apply the zone setting below */
ftype[i] = DTK_TZ;
tmask = DTK_M(TZ);
}
}
break;
case DTK_TIME:
dterr = DecodeTime(field[i], (fmask | DTK_DATE_M), INTERVAL_FULL_RANGE, &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;
*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 = NULL;
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;
}
/* fall through */
default:
break;
}
errno = 0;
val = strtoi(field[i], &cp, 10);
if (errno == ERANGE)
return DTERR_FIELD_OVERFLOW;
/*
* 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 == '.') {
dterr = ParseFractionalSecond(cp, fsec);
if (dterr)
return dterr;
tmask = DTK_ALL_SECS_M;
}
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" */
if (val < 0)
return DTERR_FIELD_OVERFLOW;
tmask = DTK_DATE_M;
j2date(val, &tm->tm_year, &tm->tm_mon, &tm->tm_mday);
isjulian = TRUE;
if (*cp == '.') {
double time;
errno = 0;
time = strtod(cp, &cp);
if (*cp != '\0' || errno != 0)
return DTERR_BAD_FORMAT;
#ifdef HAVE_INT64_TIMESTAMP
time *= USECS_PER_DAY;
#else
time *= SECS_PER_DAY;
#endif
dt2time(time, &tm->tm_hour, &tm->tm_min, &tm->tm_sec, fsec);
tmask |= DTK_TIME_M;
}
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 = NULL;
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, &is2digits, 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 * MINS_PER_HOUR;
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 * MINS_PER_HOUR;
ftype[i] = DTK_TZ;
break;
case TZ:
tm->tm_isdst = 0;
if (tzp == NULL)
return DTERR_BAD_FORMAT;
*tzp = val * MINS_PER_HOUR;
ftype[i] = DTK_TZ;
break;
case IGNORE_DTF:
break;
case AMPM:
mer = val;
break;
case ADBC:
bc = (val == BC);
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;
case UNKNOWN_FIELD:
/*
* Before giving up and declaring error, check to see
* if it is an all-alpha timezone name.
*/
namedTz = pg_tzset(field[i]);
if (NULL == namedTz)
return DTERR_BAD_FORMAT;
/* we'll apply the zone setting below */
tmask = DTK_M(TZ);
break;
default:
return DTERR_BAD_FORMAT;
}
break;
default:
return DTERR_BAD_FORMAT;
}
if (tmask & fmask)
return DTERR_BAD_FORMAT;
fmask |= tmask;
} /* end loop over fields */
/* do final checking/adjustment of Y/M/D fields */
dterr = ValidateDate(fmask, isjulian, is2digits, bc, tm);
if (dterr)
return dterr;
/* handle AM/PM */
if (mer != HR24 && tm->tm_hour > HOURS_PER_DAY / 2)
return DTERR_FIELD_OVERFLOW;
if (mer == AM && tm->tm_hour == HOURS_PER_DAY / 2)
tm->tm_hour = 0;
else if (mer == PM && tm->tm_hour != HOURS_PER_DAY / 2)
tm->tm_hour += HOURS_PER_DAY / 2;
if (tm->tm_hour < 0 || tm->tm_min < 0 || tm->tm_min > MINS_PER_HOUR - 1 || tm->tm_sec < 0 ||
tm->tm_sec > SECS_PER_MINUTE || tm->tm_hour > HOURS_PER_DAY ||
/* test for > 24:00:00 */
(tm->tm_hour == HOURS_PER_DAY && (tm->tm_min > 0 || tm->tm_sec > 0 || *fsec > 0)) ||
#ifdef HAVE_INT64_TIMESTAMP
*fsec < INT64CONST(0) || *fsec > USECS_PER_SEC
#else
*fsec < 0 || *fsec > 1
#endif
)
return DTERR_FIELD_OVERFLOW;
if ((fmask & DTK_TIME_M) != DTK_TIME_M)
return DTERR_BAD_FORMAT;
/*
* If we had a full timezone spec, compute the offset (we could not do it
* before, because we may need the date to resolve DST status).
*/
if (namedTz != NULL) {
long int gmtoff;
/* daylight savings time modifier disallowed with full TZ */
if (fmask & DTK_M(DTZMOD))
return DTERR_BAD_FORMAT;
/* if non-DST zone, we do not need to know the date */
if (pg_get_timezone_offset(namedTz, &gmtoff)) {
*tzp = -(int)gmtoff;
} else {
/* a date has to be specified */
if ((fmask & DTK_DATE_M) != DTK_DATE_M)
return DTERR_BAD_FORMAT;
*tzp = DetermineTimeZoneOffset(tm, namedTz);
}
}
/* 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 = DetermineTimeZoneOffset(tmp, session_timezone);
tm->tm_isdst = tmp->tm_isdst;
}
return 0;
}
/* DecodeDate()
* Decode date string which includes delimiters.
* Return 0 if okay, a DTERR code if not.
*
* str: field to be parsed
* fmask: bitmask for field types already seen
* *tmask: receives bitmask for fields found here
* *is2digits: set to TRUE if we find 2-digit year
* *tm: field values are stored into appropriate members of this struct
*/
static int DecodeDate(char* str, unsigned int fmask, unsigned int* tmask, bool* is2digits, struct pg_tm* tm)
{
fsec_t fsec;
int nf = 0;
int i, len;
int dterr;
bool haveTextMonth = FALSE;
int type, val;
unsigned int dmask = 0;
char* field[MAXDATEFIELDS];
*tmask = 0;
/* parse this string... */
while (*str != '\0' && nf < MAXDATEFIELDS) {
/* skip field separators */
while (*str != '\0' && !isalnum((unsigned char)*str))
str++;
if (*str == '\0')
return DTERR_BAD_FORMAT; /* end of string after separator */
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++;
}
#ifdef PGXC
if (3 == nf && strlen(field[0]) < 3) {
if (u_sess->time_cxt.DateStyle == USE_GERMAN_DATES && u_sess->time_cxt.DateOrder == DATEORDER_MDY) {
int month_val = 0;
int day_val = 0;
char* cp = NULL;
month_val = strtoi(field[0], &cp, 10);
day_val = strtoi(field[1], &cp, 10);
if (month_val >= 1 && month_val <= 12 && day_val >= 1 && day_val <= 31) {
} else {
char* p = field[0];
field[0] = field[1];
field[1] = p;
}
} else if (3 == nf && strlen(field[0]) < 3 && u_sess->time_cxt.DateStyle == USE_GERMAN_DATES &&
u_sess->time_cxt.DateOrder == DATEORDER_YMD) {
char* p = field[0];
field[0] = field[2];
field[2] = p;
} else if (3 == nf && strlen(field[0]) < 3 && u_sess->time_cxt.DateStyle == USE_SQL_DATES &&
u_sess->time_cxt.DateOrder == DATEORDER_YMD) {
char* p = field[0];
char* q = field[1];
field[0] = field[2];
field[1] = p;
field[2] = q;
}
}
#endif
/* 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;
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;
/* validation of the field values must wait until ValidateDate() */
return 0;
}
/* ValidateDate()
* Check valid year/month/day values, handle BC and DOY cases
* Return 0 if okay, a DTERR code if not.
*/
static int ValidateDate(unsigned int fmask, bool isjulian, bool is2digits, bool bc, struct pg_tm* tm)
{
if (fmask & DTK_M(YEAR)) {
if (isjulian) {
/* tm_year is correct and should not be touched */
} else if (bc) {
/* there is no year zero in AD/BC notation */
if (tm->tm_year <= 0)
return DTERR_FIELD_OVERFLOW;
/* internally, we represent 1 BC as year zero, 2 BC as -1, etc */
tm->tm_year = -(tm->tm_year - 1);
} else if (is2digits) {
/* process 1 or 2-digit input as 1970-2069 AD, allow '0' and '00' */
if (tm->tm_year < 0) /* just paranoia */
return DTERR_FIELD_OVERFLOW;
if (tm->tm_year < 70)
tm->tm_year += 2000;
else if (tm->tm_year < 100)
tm->tm_year += 1900;
} else {
/* there is no year zero in AD/BC notation */
if (tm->tm_year <= 0)
return DTERR_FIELD_OVERFLOW;
}
}
/* 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 > MONTHS_PER_YEAR)
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 ((fmask & DTK_DATE_M) == DTK_DATE_M) {
/*
* 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;
}
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.
*
* If the range is interval's minute to second mode, in order to simulate
* A db, there may need some adjustments.
*/
static int DecodeTime(
const char* str, unsigned int fmask, int range, unsigned int* tmask, struct pg_tm* tm, fsec_t* fsec)
{
char* cp = NULL;
int dterr;
*tmask = DTK_TIME_M;
errno = 0;
tm->tm_hour = strtoi(str, &cp, 10);
if (errno == ERANGE)
return DTERR_FIELD_OVERFLOW;
if (*cp != ':')
return DTERR_BAD_FORMAT;
errno = 0;
tm->tm_min = strtoi(cp + 1, &cp, 10);
if (errno == ERANGE)
return DTERR_FIELD_OVERFLOW;
if (*cp == '\0') {
tm->tm_sec = 0;
*fsec = 0;
/* If it's a MINUTE TO SECOND interval, take 2 fields as being mm:ss */
if (range == (INTERVAL_MASK(MINUTE) | INTERVAL_MASK(SECOND))) {
tm->tm_sec = tm->tm_min;
tm->tm_min = tm->tm_hour;
tm->tm_hour = tm->tm_min / MINS_PER_HOUR;
tm->tm_min -= tm->tm_hour * MINS_PER_HOUR;
}
} else if (*cp == '.') {
/* always assume mm:ss.sss is MINUTE TO SECOND */
dterr = ParseFractionalSecond(cp, fsec);
if (dterr)
return dterr;
tm->tm_sec = tm->tm_min;
tm->tm_min = tm->tm_hour;
tm->tm_hour = tm->tm_min / MINS_PER_HOUR;
tm->tm_min -= tm->tm_hour * MINS_PER_HOUR;
} else if (*cp == ':') {
errno = 0;
tm->tm_sec = strtoi(cp + 1, &cp, 10);
if (errno == ERANGE)
return DTERR_FIELD_OVERFLOW;
if (*cp == '\0')
*fsec = 0;
else if (*cp == '.') {
dterr = ParseFractionalSecond(cp, fsec);
if (dterr)
return dterr;
} else
return DTERR_BAD_FORMAT;
} 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 > MINS_PER_HOUR - 1 || tm->tm_sec < 0 ||
tm->tm_sec > SECS_PER_MINUTE || *fsec < INT64CONST(0) || *fsec > USECS_PER_SEC)
return DTERR_FIELD_OVERFLOW;
#else
if (tm->tm_hour < 0 || tm->tm_min < 0 || tm->tm_min > MINS_PER_HOUR - 1 || tm->tm_sec < 0 ||
tm->tm_sec > SECS_PER_MINUTE || *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, unsigned int fmask, unsigned int* tmask,
struct pg_tm* tm, fsec_t* fsec, bool* is2digits)
{
int val;
char* cp = NULL;
int dterr;
*tmask = 0;
errno = 0;
val = strtoi(str, &cp, 10);
if (errno == ERANGE)
return DTERR_FIELD_OVERFLOW;
if (cp == str)
return DTERR_BAD_FORMAT;
if (*cp == '.') {
/*
* 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;
}
dterr = ParseFractionalSecond(cp, fsec);
if (dterr)
return dterr;
} 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 u_sess->time_cxt.DateOrder.
*/
if (flen >= 3 || u_sess->time_cxt.DateOrder == DATEORDER_YMD) {
*tmask = DTK_M(YEAR);
tm->tm_year = val;
} else if (u_sess->time_cxt.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 || u_sess->time_cxt.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, unsigned int fmask, unsigned int* tmask, struct pg_tm* tm, fsec_t* fsec, bool* is2digits)
{
char* cp = NULL;
/*
* Have a decimal point? Then this is a date or something with a seconds
* field...
*/
if ((cp = strchr(str, '.')) != NULL) {
/*
* Can we use ParseFractionalSecond here? Not clear whether trailing
* junk should be rejected ...
*/
double frac;
errno = 0;
frac = strtod(cp, NULL);
if (errno != 0)
return DTERR_BAD_FORMAT;
#ifdef HAVE_INT64_TIMESTAMP
*fsec = rint(frac * 1000000);
#else
*fsec = frac;
#endif
/* Now truncate off the fraction for further processing */
*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.
*/
static int DecodeTimezone(const char* str, int* tzp)
{
int tz;
int hr, min, sec = 0;
char* cp = NULL;
/* leading character must be "+" or "-" */
if (*str != '+' && *str != '-')
return DTERR_BAD_FORMAT;
errno = 0;
hr = strtoi(str + 1, &cp, 10);
if (errno == ERANGE)
return DTERR_TZDISP_OVERFLOW;
/* explicit delimiter? */
if (*cp == ':') {
errno = 0;
min = strtoi(cp + 1, &cp, 10);
if (errno == ERANGE)
return DTERR_TZDISP_OVERFLOW;
if (*cp == ':') {
errno = 0;
sec = strtoi(cp + 1, &cp, 10);
if (errno == ERANGE)
return DTERR_TZDISP_OVERFLOW;
}
}
/* otherwise, might have run things together... */
else if (*cp == '\0' && strlen(str) > 3) {
min = hr % 100;
hr = hr / 100;
/* we could, but don't, support a run-together hhmmss format */
} else
min = 0;
/* Range-check the values; see notes in datatype/timestamp.h */
if (hr < 0 || hr > MAX_TZDISP_HOUR)
return DTERR_TZDISP_OVERFLOW;
if (min < 0 || min >= MINS_PER_HOUR)
return DTERR_TZDISP_OVERFLOW;
if (sec < 0 || sec >= SECS_PER_MINUTE)
return DTERR_TZDISP_OVERFLOW;
tz = (hr * MINS_PER_HOUR + min) * SECS_PER_MINUTE + sec;
if (*str == '-')
tz = -tz;
*tzp = -tz;
if (*cp != '\0')
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, const char* lowtoken, int* val)
{
int type;
const datetkn* tp = NULL;
tp = u_sess->time_cxt.datecache[field];
if (tp == NULL || strncmp(lowtoken, tp->token, TOKMAXLEN) != 0) {
tp = datebsearch(lowtoken, u_sess->time_cxt.timezone_tktbl, u_sess->time_cxt.sz_timezone_tktbl);
if (tp == NULL)
tp = datebsearch(lowtoken, datetktbl, szdatetktbl);
}
if (tp == NULL) {
type = UNKNOWN_FIELD;
*val = 0;
} else {
u_sess->time_cxt.datecache[field] = tp;
type = tp->type;
switch (type) {
case TZ:
case DTZ:
case DTZMOD:
*val = FROMVAL(tp);
break;
default:
*val = tp->value;
break;
}
}
return type;
}
/* ClearPgTM
*
* Zero out a pg_tm and associated fsec_t
*/
static inline void ClearPgTm(struct pg_tm* tm, fsec_t* fsec)
{
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;
}
/* DecodeInterval()
* Interpret previously parsed fields for general time interval.
* Returns 0 if successful, DTERR code if bogus input detected.
* dtype, tm, fsec are output parameters.
*
* 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, const int* ftype, int nf, int range, int* dtype, struct pg_tm* tm, fsec_t* fsec)
{
bool is_before = FALSE;
char* cp = NULL;
unsigned int fmask = 0, tmask;
int type;
int i;
int dterr;
int val;
double fval;
*dtype = DTK_DELTA;
type = IGNORE_DTF;
ClearPgTm(tm, fsec);
/* 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, range, &tmask, tm, fsec);
if (dterr)
return dterr;
type = DTK_DAY;
break;
case DTK_TZ:
/*
* Timezone means a token with a leading sign character and at
* least one digit; there could be ':', '.', '-' embedded in
* it as well.
*/
Assert(*field[i] == '-' || *field[i] == '+');
/*
* Check for signed hh:mm or hh:mm:ss. If so, process exactly
* like DTK_TIME case above, plus handling the sign.
*/
if (strchr(field[i] + 1, ':') != NULL &&
DecodeTime(field[i] + 1, fmask, range, &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;
break;
}
/*
* Otherwise, fall through to DTK_NUMBER case, which can
* handle signed float numbers and signed year-month values.
*/
/* fall through */
case DTK_DATE:
case DTK_NUMBER:
if (type == IGNORE_DTF) {
/* use typmod to decide what rightmost field is */
switch (range) {
case INTERVAL_MASK(YEAR):
type = DTK_YEAR;
break;
case INTERVAL_MASK(MONTH):
case INTERVAL_MASK(YEAR) | INTERVAL_MASK(MONTH):
type = DTK_MONTH;
break;
case INTERVAL_MASK(DAY):
type = DTK_DAY;
break;
case INTERVAL_MASK(HOUR):
case INTERVAL_MASK(DAY) | INTERVAL_MASK(HOUR):
type = DTK_HOUR;
break;
case INTERVAL_MASK(MINUTE):
case INTERVAL_MASK(HOUR) | INTERVAL_MASK(MINUTE):
case INTERVAL_MASK(DAY) | INTERVAL_MASK(HOUR) | INTERVAL_MASK(MINUTE):
type = DTK_MINUTE;
break;
case INTERVAL_MASK(SECOND):
case INTERVAL_MASK(MINUTE) | INTERVAL_MASK(SECOND):
case INTERVAL_MASK(HOUR) | INTERVAL_MASK(MINUTE) | INTERVAL_MASK(SECOND):
case INTERVAL_MASK(DAY) | INTERVAL_MASK(HOUR) | INTERVAL_MASK(MINUTE) | INTERVAL_MASK(SECOND):
type = DTK_SECOND;
break;
default:
type = DB_IS_CMPT(PG_FORMAT) ? DTK_SECOND : DTK_DAY;
break;
}
}
errno = 0;
val = strtoi(field[i], &cp, 10);
if (errno == ERANGE)
return DTERR_FIELD_OVERFLOW;
if (*cp == '-') {
/* SQL "years-months" syntax */
int val2;
val2 = strtoi(cp + 1, &cp, 10);
if (errno == ERANGE || val2 < 0 || val2 >= MONTHS_PER_YEAR)
return DTERR_FIELD_OVERFLOW;
if (*cp != '\0')
return DTERR_BAD_FORMAT;
type = DTK_MONTH;
if (*field[i] == '-')
val2 = -val2;
val = val * MONTHS_PER_YEAR + val2;
fval = 0;
} else if (*cp == '.') {
errno = 0;
fval = strtod(cp, &cp);
if (*cp != '\0' || errno != 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 += rint(val + fval);
#else
*fsec += (val + fval) * 1e-6;
#endif
tmask = DTK_M(MICROSECOND);
break;
case DTK_MILLISEC:
/* avoid overflowing the fsec field */
tm->tm_sec += val / 1000;
val -= (val / 1000) * 1000;
#ifdef HAVE_INT64_TIMESTAMP
*fsec += rint((val + fval) * 1000);
#else
*fsec += (val + fval) * 1e-3;
#endif
tmask = DTK_M(MILLISECOND);
break;
case DTK_SECOND:
tm->tm_sec += val;
#ifdef HAVE_INT64_TIMESTAMP
*fsec += rint(fval * 1000000);
#else
*fsec += fval;
#endif
/*
* If any subseconds were specified, consider this
* microsecond and millisecond input as well.
*/
if (fval == 0)
tmask = DTK_M(SECOND);
else
tmask = DTK_ALL_SECS_M;
break;
case DTK_MINUTE:
tm->tm_min += val;
AdjustFractSeconds(fval, tm, fsec, SECS_PER_MINUTE);
tmask = DTK_M(MINUTE);
break;
case DTK_HOUR:
tm->tm_hour += val;
AdjustFractSeconds(fval, tm, fsec, SECS_PER_HOUR);
tmask = DTK_M(HOUR);
type = DTK_DAY; /* set for next field */
break;
case DTK_DAY:
tm->tm_mday += val;
AdjustFractSeconds(fval, tm, fsec, SECS_PER_DAY);
tmask = DTK_M(DAY);
break;
case DTK_WEEK:
tm->tm_mday += val * 7;
AdjustFractDays(fval, tm, fsec, 7);
tmask = DTK_M(WEEK);
break;
case DTK_MONTH:
tm->tm_mon += val;
AdjustFractDays(fval, tm, fsec, DAYS_PER_MONTH);
tmask = DTK_M(MONTH);
break;
case DTK_YEAR:
tm->tm_year += val;
if (fval != 0)
tm->tm_mon += (int)(fval * MONTHS_PER_YEAR);
tmask = DTK_M(YEAR);
break;
case DTK_DECADE:
tm->tm_year += val * 10;
if (fval != 0)
tm->tm_mon += (int)(fval * MONTHS_PER_YEAR * 10);
tmask = DTK_M(DECADE);
break;
case DTK_CENTURY:
tm->tm_year += val * 100;
if (fval != 0)
tm->tm_mon += (int)(fval * MONTHS_PER_YEAR * 100);
tmask = DTK_M(CENTURY);
break;
case DTK_MILLENNIUM:
tm->tm_year += val * 1000;
if (fval != 0)
tm->tm_mon += (int)(fval * MONTHS_PER_YEAR * 1000);
tmask = DTK_M(MILLENNIUM);
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;
}
/* ensure that at least one time field has been found */
if (fmask == 0)
return DTERR_BAD_FORMAT;
/* ensure fractional seconds are fractional */
if (*fsec != 0) {
int sec;
#ifdef HAVE_INT64_TIMESTAMP
sec = *fsec / USECS_PER_SEC;
*fsec -= sec * USECS_PER_SEC;
#else
TMODULO(*fsec, sec, 1.0);
#endif
tm->tm_sec += sec;
}
/* ----------
* The SQL standard defines the interval literal
* '-1 1:00:00'
* to mean "negative 1 days and negative 1 hours", while openGauss
* traditionally treats this as meaning "negative 1 days and positive
* 1 hours". In SQL_STANDARD intervalstyle, we apply the leading sign
* to all fields if there are no other explicit signs.
*
* We leave the signs alone if there are additional explicit signs.
* This protects us against misinterpreting openGauss-style dump output,
* since the postgres-style output code has always put an explicit sign on
* all fields following a negative field. But note that SQL-spec output
* is ambiguous and can be misinterpreted on load! (So it's best practice
* to dump in openGauss style, not SQL style.)
* Because A db used standard SQL interval format. In order to simulate A db,
* there deleted the judge of IntervalStyle. So it will always use SQL_STANDARD.
* ----------
*/
/* use standard sql interval */
if (*field[0] == '-') {
/* Check for additional explicit signs */
bool more_signs = false;
for (i = 1; i < nf; i++) {
if (*field[i] == '-' || *field[i] == '+') {
more_signs = true;
break;
}
}
if (!more_signs) {
/*
* Rather than re-determining which field was field[0], just force
* 'em all negative.
*/
if (*fsec > 0)
*fsec = -(*fsec);
if (tm->tm_sec > 0)
tm->tm_sec = -tm->tm_sec;
if (tm->tm_min > 0)
tm->tm_min = -tm->tm_min;
if (tm->tm_hour > 0)
tm->tm_hour = -tm->tm_hour;
if (tm->tm_mday > 0)
tm->tm_mday = -tm->tm_mday;
if (tm->tm_mon > 0)
tm->tm_mon = -tm->tm_mon;
if (tm->tm_year > 0)
tm->tm_year = -tm->tm_year;
}
}
/* finally, AGO negates everything */
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;
}
return 0;
}
/*
* Helper functions to avoid duplicated code in DecodeISO8601Interval.
*
* Parse a decimal value and break it into integer and fractional parts.
* Returns 0 or DTERR code.
*/
static int ParseISO8601Number(const char* str, char** endptr, int* ipart, double* fpart)
{
double val;
if (!(isdigit((unsigned char)*str) || *str == '-' || *str == '.'))
return DTERR_BAD_FORMAT;
errno = 0;
val = strtod(str, endptr);
/* did we not see anything that looks like a double? */
if (*endptr == str || errno != 0)
return DTERR_BAD_FORMAT;
/* watch out for overflow */
if (val < INT_MIN || val > INT_MAX)
return DTERR_FIELD_OVERFLOW;
/* be very sure we truncate towards zero (cf dtrunc()) */
if (val >= 0) {
*ipart = (int)floor(val);
} else {
*ipart = (int)-floor(-val);
}
*fpart = val - *ipart;
return 0;
}
/*
* Determine number of integral digits in a valid ISO 8601 number field
* (we should ignore sign and any fraction part)
*/
static int ISO8601IntegerWidth(const char* fieldstart)
{
/* We might have had a leading '-' */
if (*fieldstart == '-')
fieldstart++;
return strspn(fieldstart, "0123456789");
}
/* DecodeISO8601Interval()
* Decode an ISO 8601 time interval of the "format with designators"
* (section 4.4.3.2) or "alternative format" (section 4.4.3.3)
* Examples: P1D for 1 day
* PT1H for 1 hour
* P2Y6M7DT1H30M for 2 years, 6 months, 7 days 1 hour 30 min
* P0002-06-07T01:30:00 the same value in alternative format
*
* Returns 0 if successful, DTERR code if bogus input detected.
* Note: error code should be DTERR_BAD_FORMAT if input doesn't look like
* ISO8601, otherwise this could cause unexpected error messages.
* dtype, tm, fsec are output parameters.
*
* A couple exceptions from the spec:
* - a week field ('W') may coexist with other units
* - allows decimals in fields other than the least significant unit.
*/
int DecodeISO8601Interval(char* str, int* dtype, struct pg_tm* tm, fsec_t* fsec)
{
bool datepart = true;
bool havefield = false;
*dtype = DTK_DELTA;
ClearPgTm(tm, fsec);
if (strlen(str) < 2 || str[0] != 'P')
return DTERR_BAD_FORMAT;
str++;
while (*str) {
char* fieldstart = NULL;
int val;
double fval;
char unit;
int dterr;
if (*str == 'T') /* T indicates the beginning of the time part */
{
datepart = false;
havefield = false;
str++;
continue;
}
fieldstart = str;
dterr = ParseISO8601Number(str, &str, &val, &fval);
if (dterr)
return dterr;
/*
* Note: we could step off the end of the string here. Code below
* *must* exit the loop if unit == '\0'.
*/
unit = *str++;
if (datepart) {
switch (unit) /* before T: Y M W D */
{
case 'Y':
tm->tm_year += val;
tm->tm_mon += (int)(fval * MONTHS_PER_YEAR);
break;
case 'M':
tm->tm_mon += val;
AdjustFractDays(fval, tm, fsec, DAYS_PER_MONTH);
break;
case 'W':
tm->tm_mday += val * 7;
AdjustFractDays(fval, tm, fsec, 7);
break;
case 'D':
tm->tm_mday += val;
AdjustFractSeconds(fval, tm, fsec, SECS_PER_DAY);
break;
case 'T': /* ISO 8601 4.4.3.3 Alternative Format / Basic */
case '\0':
if (ISO8601IntegerWidth(fieldstart) == 8 && !havefield) {
tm->tm_year += val / 10000;
tm->tm_mon += (val / 100) % 100;
tm->tm_mday += val % 100;
AdjustFractSeconds(fval, tm, fsec, SECS_PER_DAY);
if (unit == '\0')
return 0;
datepart = false;
havefield = false;
continue;
}
/* Else fall through to extended alternative format */
/* fall through */
case '-': /* ISO 8601 4.4.3.3 Alternative Format,
* Extended */
if (havefield)
return DTERR_BAD_FORMAT;
tm->tm_year += val;
tm->tm_mon += (int)(fval * MONTHS_PER_YEAR);
if (unit == '\0')
return 0;
if (unit == 'T') {
datepart = false;
havefield = false;
continue;
}
dterr = ParseISO8601Number(str, &str, &val, &fval);
if (dterr)
return dterr;
tm->tm_mon += val;
AdjustFractDays(fval, tm, fsec, DAYS_PER_MONTH);
if (*str == '\0')
return 0;
if (*str == 'T') {
datepart = false;
havefield = false;
continue;
}
if (*str != '-')
return DTERR_BAD_FORMAT;
str++;
dterr = ParseISO8601Number(str, &str, &val, &fval);
if (dterr)
return dterr;
tm->tm_mday += val;
AdjustFractSeconds(fval, tm, fsec, SECS_PER_DAY);
if (*str == '\0')
return 0;
if (*str == 'T') {
datepart = false;
havefield = false;
continue;
}
return DTERR_BAD_FORMAT;
default:
/* not a valid date unit suffix */
return DTERR_BAD_FORMAT;
}
} else {
switch (unit) /* after T: H M S */
{
case 'H':
tm->tm_hour += val;
AdjustFractSeconds(fval, tm, fsec, SECS_PER_HOUR);
break;
case 'M':
tm->tm_min += val;
AdjustFractSeconds(fval, tm, fsec, SECS_PER_MINUTE);
break;
case 'S':
tm->tm_sec += val;
AdjustFractSeconds(fval, tm, fsec, 1);
break;
case '\0': /* ISO 8601 4.4.3.3 Alternative Format */
if (ISO8601IntegerWidth(fieldstart) == 6 && !havefield) {
tm->tm_hour += val / 10000;
tm->tm_min += (val / 100) % 100;
tm->tm_sec += val % 100;
AdjustFractSeconds(fval, tm, fsec, 1);
return 0;
}
/* Else fall through to extended alternative format */
/* fall through */
case ':': /* ISO 8601 4.4.3.3 Alternative Format,
* Extended */
if (havefield)
return DTERR_BAD_FORMAT;
tm->tm_hour += val;
AdjustFractSeconds(fval, tm, fsec, SECS_PER_HOUR);
if (unit == '\0')
return 0;
dterr = ParseISO8601Number(str, &str, &val, &fval);
if (dterr)
return dterr;
tm->tm_min += val;
AdjustFractSeconds(fval, tm, fsec, SECS_PER_MINUTE);
if (*str == '\0')
return 0;
if (*str != ':')
return DTERR_BAD_FORMAT;
str++;
dterr = ParseISO8601Number(str, &str, &val, &fval);
if (dterr)
return dterr;
tm->tm_sec += val;
AdjustFractSeconds(fval, tm, fsec, 1);
if (*str == '\0')
return 0;
return DTERR_BAD_FORMAT;
default:
/* not a valid time unit suffix */
return DTERR_BAD_FORMAT;
}
}
havefield = true;
}
return 0;
}
/* DecodeUnits()
* Decode text string using lookup table.
* This routine supports time interval decoding
* (hence, it need not recognize timezone names).
*/
int DecodeUnits(int field, const char* lowtoken, int* val)
{
int type;
const datetkn* tp = NULL;
tp = u_sess->time_cxt.deltacache[field];
if (tp == NULL || strncmp(lowtoken, tp->token, TOKMAXLEN) != 0) {
tp = datebsearch(lowtoken, deltatktbl, szdeltatktbl);
}
if (tp == NULL) {
type = UNKNOWN_FIELD;
*val = 0;
} else {
u_sess->time_cxt.deltacache[field] = tp;
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, bool can_ignore)
{
int level = can_ignore ? WARNING : ERROR;
switch (dterr) {
case DTERR_FIELD_OVERFLOW:
ereport(level,
(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 u_sess->time_cxt.DateStyle</nanny> */
ereport(level,
(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(level,
(errcode(ERRCODE_INTERVAL_FIELD_OVERFLOW), errmsg("interval field value out of range: \"%s\"", str)));
break;
case DTERR_TZDISP_OVERFLOW:
ereport(level,
(errcode(ERRCODE_INVALID_TIME_ZONE_DISPLACEMENT_VALUE),
errmsg("time zone displacement out of range: \"%s\"", str)));
break;
case DTERR_BAD_FORMAT:
default:
ereport(level,
(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 const datetkn* datebsearch(const char* key, const datetkn* base, int nel)
{
if (nel > 0) {
const datetkn *last = base + nel - 1, *position = NULL;
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;
}
/* EncodeTimezone()
* Copies representation of a numeric timezone offset to str.
*
* Returns a pointer to the new end of string. No NUL terminator is put
* there; callers are responsible for NUL terminating str themselves.
*/
static char* EncodeTimezone(char* str, int tz, int style)
{
int hour, min, sec;
sec = abs(tz);
min = sec / SECS_PER_MINUTE;
sec -= min * SECS_PER_MINUTE;
hour = min / MINS_PER_HOUR;
min -= hour * MINS_PER_HOUR;
/* TZ is negated compared to sign we wish to display ... */
*str++ = ((tz <= 0) ? '+' : '-');
if (sec != 0)
{
str = pg_ultostr_zeropad(str, hour, 2);
*str++ = ':';
str = pg_ultostr_zeropad(str, min, 2);
*str++ = ':';
str = pg_ultostr_zeropad(str, sec, 2);
}
else if (min != 0 || style == USE_XSD_DATES)
{
str = pg_ultostr_zeropad(str, hour, 2);
*str++ = ':';
str = pg_ultostr_zeropad(str, min, 2);
}
else
str = pg_ultostr_zeropad(str, hour, 2);
return str;
}
/* EncodeDateOnly()
* Encode date as local time.
*/
void EncodeDateOnly(struct pg_tm* tm, int style, char* str)
{
Assert(tm->tm_mon >= 1 && tm->tm_mon <= MONTHS_PER_YEAR);
switch (style) {
case USE_ISO_DATES:
case USE_XSD_DATES:
/* compatible with ISO date formats */
str = pg_ultostr_zeropad(str,
(tm->tm_year > 0) ? tm->tm_year : -(tm->tm_year - 1), 4);
*str++ = '-';
str = pg_ultostr_zeropad(str, tm->tm_mon, 2);
*str++ = '-';
str = pg_ultostr_zeropad(str, tm->tm_mday, 2);
break;
case USE_SQL_DATES:
/* compatible with A db/Ingres date formats */
if (u_sess->time_cxt.DateOrder == DATEORDER_DMY) {
str = pg_ultostr_zeropad(str, tm->tm_mday, 2);
*str++ = '/';
str = pg_ultostr_zeropad(str, tm->tm_mon, 2);
}
else {
str = pg_ultostr_zeropad(str, tm->tm_mon, 2);
*str++ = '/';
str = pg_ultostr_zeropad(str, tm->tm_mday, 2);
}
*str++ = '/';
str = pg_ultostr_zeropad(str,
(tm->tm_year > 0) ? tm->tm_year : -(tm->tm_year - 1), 4);
break;
case USE_GERMAN_DATES:
/* German-style date format */
str = pg_ultostr_zeropad(str, tm->tm_mday, 2);
*str++ = '.';
str = pg_ultostr_zeropad(str, tm->tm_mon, 2);
*str++ = '.';
str = pg_ultostr_zeropad(str,
(tm->tm_year > 0) ? tm->tm_year : -(tm->tm_year - 1), 4);
break;
case USE_POSTGRES_DATES:
default:
/* traditional date-only style for openGauss */
if (u_sess->time_cxt.DateOrder == DATEORDER_DMY) {
str = pg_ultostr_zeropad(str, tm->tm_mday, 2);
*str++ = '-';
str = pg_ultostr_zeropad(str, tm->tm_mon, 2);
}
else {
str = pg_ultostr_zeropad(str, tm->tm_mon, 2);
*str++ = '-';
str = pg_ultostr_zeropad(str, tm->tm_mday, 2);
}
*str++ = '-';
str = pg_ultostr_zeropad(str,
(tm->tm_year > 0) ? tm->tm_year : -(tm->tm_year - 1), 4);
break;
}
if (tm->tm_year <= 0)
{
errno_t rc = memcpy_s(str, 3, " BC", 3); /* Don't copy NUL */
securec_check(rc, "", "");
str += 3;
}
*str = '\0';
}
/* EncodeTimeOnly()
* Encode time fields only.
*
* tm and fsec are the value to encode, print_tz determines whether to include
* a time zone (the difference between time and timetz types), tz is the
* numeric time zone offset, style is the date style, str is where to write the
* output.
*/
void EncodeTimeOnly(struct pg_tm* tm, fsec_t fsec, bool print_tz, int tz, int style, char* str)
{
str = pg_ultostr_zeropad(str, tm->tm_hour, 2);
*str++ = ':';
str = pg_ultostr_zeropad(str, tm->tm_min, 2);
*str++ = ':';
str = AppendSeconds(str, tm->tm_sec, fsec, MAX_TIME_PRECISION, true);
if (print_tz)
str = EncodeTimezone(str, tz, style);
*str = '\0';
}
/* EncodeDateTime()
* Encode date and time interpreted as local time.
*
* tm and fsec are the value to encode, print_tz determines whether to include
* a time zone (the difference between timestamp and timestamptz types), tz is
* the numeric time zone offset, tzn is the textual time zone, which if
* specified will be used instead of tz by some styles, style is the date
* style, str is where to write the output.
*
* Supported date styles:
* openGauss - 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
* XSD - yyyy-mm-ddThh:mm:ss.ss+/-tz
*/
void EncodeDateTime(struct pg_tm* tm, fsec_t fsec, bool print_tz, int tz, const char* tzn, int style, char* str)
{
int day;
errno_t rc = EOK;
Assert(tm->tm_mon >= 1 && tm->tm_mon <= MONTHS_PER_YEAR);
/*
* Negative tm_isdst means we have no valid time zone translation.
*/
if (tm->tm_isdst < 0)
print_tz = false;
switch (style) {
case USE_ISO_DATES:
case USE_XSD_DATES:
/* Compatible with ISO-8601 date formats */
str = pg_ultostr_zeropad(str,
(tm->tm_year > 0) ? tm->tm_year : -(tm->tm_year - 1), 4);
*str++ = '-';
str = pg_ultostr_zeropad(str, tm->tm_mon, 2);
*str++ = '-';
str = pg_ultostr_zeropad(str, tm->tm_mday, 2);
*str++ = (style == USE_ISO_DATES) ? ' ' : 'T';
str = pg_ultostr_zeropad(str, tm->tm_hour, 2);
*str++ = ':';
str = pg_ultostr_zeropad(str, tm->tm_min, 2);
*str++ = ':';
str = AppendTimestampSeconds(str, tm, fsec);
if (print_tz)
str = EncodeTimezone(str, tz, style);
break;
case USE_SQL_DATES:
/* Compatible with A db/Ingres date formats */
if (u_sess->time_cxt.DateOrder == DATEORDER_DMY) {
str = pg_ultostr_zeropad(str, tm->tm_mday, 2);
*str++ = '/';
str = pg_ultostr_zeropad(str, tm->tm_mon, 2);
} else {
str = pg_ultostr_zeropad(str, tm->tm_mon, 2);
*str++ = '/';
str = pg_ultostr_zeropad(str, tm->tm_mday, 2);
}
*str++ = '/';
str = pg_ultostr_zeropad(str,
(tm->tm_year > 0) ? tm->tm_year : -(tm->tm_year - 1), 4);
*str++ = ' ';
str = pg_ultostr_zeropad(str, tm->tm_hour, 2);
*str++ = ':';
str = pg_ultostr_zeropad(str, tm->tm_min, 2);
*str++ = ':';
str = AppendTimestampSeconds(str, tm, fsec);
/*
* Note: the uses of %.*s in this function would be risky if the
* timezone names ever contain non-ASCII characters. However, all
* TZ abbreviations in the IANA database are plain ASCII.
*/
if (print_tz) {
if (NULL != tzn) {
rc = sprintf_s(str, MAXDATELEN + 1, " %.*s", MAXTZLEN, tzn);
securec_check_ss(rc, "\0", "\0");
str += strlen(str);
} else
str = EncodeTimezone(str, tz, style);
}
break;
case USE_GERMAN_DATES:
/* German variant on European style */
str = pg_ultostr_zeropad(str, tm->tm_mday, 2);
*str++ = '.';
str = pg_ultostr_zeropad(str, tm->tm_mon, 2);
*str++ = '.';
str = pg_ultostr_zeropad(str,
(tm->tm_year > 0) ? tm->tm_year : -(tm->tm_year - 1), 4);
*str++ = ' ';
str = pg_ultostr_zeropad(str, tm->tm_hour, 2);
*str++ = ':';
str = pg_ultostr_zeropad(str, tm->tm_min, 2);
*str++ = ':';
str = AppendTimestampSeconds(str, tm, fsec);
if (print_tz) {
if (NULL != tzn) {
rc = sprintf_s(str, MAXDATELEN + 1, " %.*s", MAXTZLEN, tzn);
securec_check_ss(rc, "\0", "\0");
str += strlen(str);
} else
str = EncodeTimezone(str, tz, style);
}
break;
case USE_POSTGRES_DATES:
default:
/* Backward-compatible with traditional openGauss abstime dates */
day = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday);
tm->tm_wday = j2day(day);
rc = memcpy_s(str, 3, days[tm->tm_wday], 3);
securec_check(rc, "", "");
str += 3;
*str++ = ' ';
if (u_sess->time_cxt.DateOrder == DATEORDER_DMY) {
str = pg_ultostr_zeropad(str, tm->tm_mday, 2);
*str++ = ' ';
rc = memcpy_s(str, 3, months[tm->tm_mon - 1], 3);
securec_check(rc, "", "");
str += 3;
} else {
rc = memcpy_s(str, 3, months[tm->tm_mon - 1], 3);
securec_check(rc, "", "");
str += 3;
*str++ = ' ';
str = pg_ultostr_zeropad(str, tm->tm_mday, 2);
}
*str++ = ' ';
str = pg_ultostr_zeropad(str, tm->tm_hour, 2);
*str++ = ':';
str = pg_ultostr_zeropad(str, tm->tm_min, 2);
*str++ = ':';
str = AppendTimestampSeconds(str, tm, fsec);
*str++ = ' ';
str = pg_ultostr_zeropad(str,
(tm->tm_year > 0) ? tm->tm_year : -(tm->tm_year - 1), 4);
if (print_tz) {
if (NULL != tzn) {
rc = sprintf_s(str, MAXDATELEN + 1, " %.*s", MAXTZLEN, tzn);
securec_check_ss(rc, "\0", "\0");
str += strlen(str);
} 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
*/
*str++ = ' ';
str = EncodeTimezone(str, tz, style);
}
}
break;
}
if (tm->tm_year <= 0) {
rc = memcpy_s(str, 3, " BC", 3); /* Don't copy NUL */
securec_check(rc, "", "");
str += 3;
}
*str = '\0';
}
/*
* Helper functions to avoid duplicated code in EncodeInterval.
*/
/* Append an ISO-8601-style interval field, but only if value isn't zero */
static char* AddISO8601IntPart(char* cp, int value, char units)
{
if (value == 0)
return cp;
errno_t rc = sprintf_s(cp, MAXDATELEN + 1, "%d%c", value, units);
securec_check_ss(rc, "\0", "\0");
return cp + strlen(cp);
}
/* Append a openGauss interval field, but only if value isn't zero */
static char* AddPostgresIntPart(char* cp, int value, const char* units, bool* is_zero, bool* is_before)
{
if (value == 0)
return cp;
errno_t rc = sprintf_s(cp,
MAXDATELEN + 1,
"%s%s%d %s%s",
(!*is_zero) ? " " : "",
(*is_before && value > 0) ? "+" : "",
value,
units,
(value != 1) ? "s" : "");
securec_check_ss(rc, "\0", "\0");
/*
* Each nonzero field sets is_before for (only) the next one. This is a
* tad bizarre but it's how it worked before...
*/
*is_before = (value < 0);
*is_zero = FALSE;
return cp + strlen(cp);
}
/* Append a verbose-style interval field, but only if value isn't zero */
static char* AddVerboseIntPart(char* cp, int value, const char* units, bool* is_zero, bool* is_before)
{
if (value == 0)
return cp;
/* first nonzero value sets is_before */
if (*is_zero) {
*is_before = (value < 0);
value = abs(value);
} else if (*is_before)
value = -value;
errno_t rc = sprintf_s(cp, MAXDATELEN + 1, " %d %s%s", value, units, (value == 1) ? "" : "s");
securec_check_ss(rc, "\0", "\0");
*is_zero = FALSE;
return cp + strlen(cp);
}
/* AppendTrailingZeros()
* To compatible A db, numdstointerval() reserve 9 digits after seconds.
*/
static void AppendTrailingZeros(char* str)
{
char* tmp = NULL;
int len;
const int expected_len = 10;
tmp = strchr(str, '.');
if (tmp == NULL)
return;
len = strlen(tmp);
if (len > expected_len) {
*(tmp + expected_len) = '\0';
} else {
while (len < 10) {
*(tmp + len) = '0';
len++;
}
*(tmp + 10) = '\0';
}
}
/* 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
*
* Actually, afaik, ISO 8601 does specify formats for "time
* intervals...[of the]...format with time-unit designators", which
* are pretty ugly. The format looks something like
* P1Y1M1DT1H1M1.12345S
* but useful for exchanging data with computers instead of humans.
* - ron 2003-07-14
*
* And ISO's SQL 2008 standard specifies standards for
* "year-month literal"s (that look like '2-3') and
* "day-time literal"s (that look like ('4 5:6:7')
*/
void EncodeInterval(struct pg_tm* tm, fsec_t fsec, int style, char* str)
{
char* cp = str;
int year = tm->tm_year;
int mon = tm->tm_mon;
int mday = tm->tm_mday;
int hour = tm->tm_hour;
int min = tm->tm_min;
int sec = tm->tm_sec;
errno_t rc = EOK;
bool is_before = FALSE;
bool is_zero = TRUE;
int curlen = MAXDATELEN + 1;
/*
* 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_zero when determining the signs of day and hour/minute/seconds
* fields.
*/
switch (style) {
case INTSTYLE_A: {
bool has_negative = year < 0 || mon < 0 || mday < 0 || hour < 0 || min < 0 || sec < 0 || fsec < 0;
bool has_positive = year > 0 || mon > 0 || mday > 0 || hour > 0 || min > 0 || sec > 0 || fsec > 0;
bool has_year_month = year != 0 || mon != 0;
bool has_day_time = mday != 0 || hour != 0 || min != 0 || sec != 0 || fsec != 0;
bool sql_standard_value = !(has_negative && has_positive) && !(has_year_month && has_day_time);
bool has_day_sec = !has_year_month && has_day_time;
errno_t rc = EOK;
if (year == 0 && mon == 0 && mday == 0 && hour == 0 && min == 0 && sec == 0 && fsec == 0) {
has_day_sec = true;
}
/*
* SQL Standard wants only 1 "<sign>" preceding the whole
* interval ... but can't do that if mixed signs.
*/
if (has_negative && sql_standard_value) {
*cp++ = '-';
curlen--;
}
/*
* SQL Standard value has day time and don't has year month
* And the value is postive, add + to convert A db format
*/
if (has_positive && sql_standard_value && has_day_sec) {
*cp++ = '+';
curlen--;
}
if (!has_negative && !has_positive) {
rc = snprintf_s(cp, curlen, curlen - 1, "+000000000 00:00:00.000000000");
securec_check_ss(rc, "\0", "\0");
} else if (!sql_standard_value) {
/*
* For non sql-standard interval values, force outputting
* the signs to avoid ambiguities with intervals with
* mixed sign components.
*/
char year_sign = (year < 0 || mon < 0) ? '-' : '+';
char day_sign = (mday < 0) ? '-' : '+';
char sec_sign = (hour < 0 || min < 0 || sec < 0 || fsec < 0) ? '-' : '+';
rc = snprintf_s(cp,
curlen,
curlen - 1,
"%c%d-%d %c%d %c%d:%02d:",
year_sign,
abs(year),
abs(mon),
day_sign,
abs(mday),
sec_sign,
abs(hour),
abs(min));
securec_check_ss(rc, "\0", "\0");
cp += strlen(cp);
cp = AppendSeconds(cp, sec, fsec, MAX_INTERVAL_PRECISION, true);
*cp = '\0';
}
/* the format for has_year_month */
else if (has_year_month) {
rc = snprintf_s(cp, curlen, curlen - 1, "%d-%d", abs(year), abs(mon));
securec_check_ss(rc, "\0", "\0");
}
/* convert hour to day and output in A db format */
else {
int len = 0;
if (pg_add_s32_overflow(mday, hour / 24, &mday)) {
ereport(ERROR,
(errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
errmsg("the interval value is overflow, it can not perform as A db interval-style")));
}
hour = hour % 24;
rc = snprintf_s(cp, curlen, curlen - 1, "%09d %02d:%02d:", abs(mday), abs(hour), abs(min));
securec_check_ss(rc, "\0", "\0");
len = strlen(cp);
cp += len;
curlen -= len;
#ifdef HAVE_INT64_TIMESTAMP
rc = snprintf_s(cp, curlen, curlen - 1, "%02d.%06d", abs(sec), (int)Abs(fsec));
#else
rc = snprintf_s(cp, curlen, curlen - 1, "%0*.*f", 9, 9, fabs(sec + fsec));
#endif
securec_check_ss(rc, "\0", "\0");
}
AppendTrailingZeros(cp);
} break;
/* SQL Standard interval format */
case INTSTYLE_SQL_STANDARD: {
bool has_negative = year < 0 || mon < 0 || mday < 0 || hour < 0 || min < 0 || sec < 0 || fsec < 0;
bool has_positive = year > 0 || mon > 0 || mday > 0 || hour > 0 || min > 0 || sec > 0 || fsec > 0;
bool has_year_month = year != 0 || mon != 0;
bool has_day_time = mday != 0 || hour != 0 || min != 0 || sec != 0 || fsec != 0;
bool has_day = mday != 0;
bool sql_standard_value = !(has_negative && has_positive) && !(has_year_month && has_day_time);
/*
* SQL Standard wants only 1 "<sign>" preceding the whole
* interval ... but can't do that if mixed signs.
*/
if (has_negative && sql_standard_value) {
*cp++ = '-';
year = -year;
mon = -mon;
mday = -mday;
hour = -hour;
min = -min;
sec = -sec;
fsec = -fsec;
curlen--;
}
if (!has_negative && !has_positive) {
rc = sprintf_s(cp, curlen, "0");
securec_check_ss(rc, "\0", "\0");
} else if (!sql_standard_value) {
/*
* For non sql-standard interval values, force outputting
* the signs to avoid ambiguities with intervals with
* mixed sign components.
*/
char year_sign = (year < 0 || mon < 0) ? '-' : '+';
char day_sign = (mday < 0) ? '-' : '+';
char sec_sign = (hour < 0 || min < 0 || sec < 0 || fsec < 0) ? '-' : '+';
rc = sprintf_s(cp,
curlen,
"%c%d-%d %c%d %c%d:%02d:",
year_sign,
abs(year),
abs(mon),
day_sign,
abs(mday),
sec_sign,
abs(hour),
abs(min));
securec_check_ss(rc, "\0", "\0");
cp += strlen(cp);
cp = AppendSeconds(cp, sec, fsec, MAX_INTERVAL_PRECISION, true);
*cp = '\0';
} else if (has_year_month) {
rc = sprintf_s(cp, curlen, "%d-%d", year, mon);
securec_check_ss(rc, "\0", "\0");
} else if (has_day) {
rc = sprintf_s(cp, curlen, "%d %d:%02d:", mday, hour, min);
securec_check_ss(rc, "\0", "\0");
cp += strlen(cp);
cp = AppendSeconds(cp, sec, fsec, MAX_INTERVAL_PRECISION, true);
*cp = '\0';
} else {
rc = sprintf_s(cp, curlen, "%d:%02d:", hour, min);
securec_check_ss(rc, "\0", "\0");
cp += strlen(cp);
cp = AppendSeconds(cp, sec, fsec, MAX_INTERVAL_PRECISION, true);
*cp = '\0';
}
} break;
/* ISO 8601 "time-intervals by duration only" */
case INTSTYLE_ISO_8601:
/* special-case zero to avoid printing nothing */
if (year == 0 && mon == 0 && mday == 0 && hour == 0 && min == 0 && sec == 0 && fsec == 0) {
rc = sprintf_s(cp, MAXDATELEN + 1, "PT0S");
securec_check_ss(rc, "\0", "\0");
break;
}
*cp++ = 'P';
cp = AddISO8601IntPart(cp, year, 'Y');
cp = AddISO8601IntPart(cp, mon, 'M');
cp = AddISO8601IntPart(cp, mday, 'D');
if (hour != 0 || min != 0 || sec != 0 || fsec != 0)
*cp++ = 'T';
cp = AddISO8601IntPart(cp, hour, 'H');
cp = AddISO8601IntPart(cp, min, 'M');
if (sec != 0 || fsec != 0) {
if (sec < 0 || fsec < 0)
*cp++ = '-';
cp = AppendSeconds(cp, sec, fsec, MAX_INTERVAL_PRECISION, false);
*cp++ = 'S';
*cp++ = '\0';
}
break;
/* Compatible with postgresql < 8.4 when u_sess->time_cxt.DateStyle = 'iso' */
case INTSTYLE_POSTGRES:
cp = AddPostgresIntPart(cp, year, "year", &is_zero, &is_before);
/*
* Ideally we should spell out "month" like we do for "year" and
* "day". However, for backward compatibility, we can't easily
* fix this. bjm 2011-05-24
*/
cp = AddPostgresIntPart(cp, mon, "mon", &is_zero, &is_before);
cp = AddPostgresIntPart(cp, mday, "day", &is_zero, &is_before);
if (is_zero || hour != 0 || min != 0 || sec != 0 || fsec != 0) {
bool minus = (hour < 0 || min < 0 || sec < 0 || fsec < 0);
rc = sprintf_s(cp,
MAXDATELEN + 1,
"%s%s%02d:%02d:",
is_zero ? "" : " ",
(minus ? "-" : (is_before ? "+" : "")),
abs(hour),
abs(min));
securec_check_ss(rc, "\0", "\0");
cp += strlen(cp);
cp = AppendSeconds(cp, sec, fsec, MAX_INTERVAL_PRECISION, true);
*cp = '\0';
}
break;
/* Compatible with postgresql < 8.4 when u_sess->time_cxt.DateStyle != 'iso' */
case INTSTYLE_POSTGRES_VERBOSE:
default:
rc = strcpy_s(cp, MAXDATELEN + 1, "@");
securec_check_ss_c(rc, "\0", "\0");
cp++;
curlen--;
cp = AddVerboseIntPart(cp, year, "year", &is_zero, &is_before);
cp = AddVerboseIntPart(cp, mon, "mon", &is_zero, &is_before);
cp = AddVerboseIntPart(cp, mday, "day", &is_zero, &is_before);
cp = AddVerboseIntPart(cp, hour, "hour", &is_zero, &is_before);
cp = AddVerboseIntPart(cp, min, "min", &is_zero, &is_before);
if (sec != 0 || fsec != 0) {
*cp++ = ' ';
curlen--;
if (sec < 0 || (sec == 0 && fsec < 0)) {
if (is_zero) {
is_before = TRUE;
} else if (!is_before) {
*cp++ = '-';
curlen--;
}
} else if (is_before) {
*cp++ = '-';
curlen--;
}
cp = AppendSeconds(cp, sec, fsec, MAX_INTERVAL_PRECISION, false);
rc = sprintf_s(cp, curlen, " sec%s", (abs(sec) != 1 || fsec != 0) ? "s" : "");
securec_check_ss(rc, "\0", "\0");
is_zero = FALSE;
}
/* identically zero? then put in a unitless zero... */
if (is_zero) {
rc = strcat_s(cp, curlen, " 0");
securec_check(rc, "\0", "\0");
}
if (is_before) {
rc = strcat_s(cp, curlen, " ago");
securec_check(rc, "\0", "\0");
}
break;
}
}
/*
* 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, const datetkn* base, int nel)
{
bool ok = true;
int i;
for (i = 1; i < nel; i++) {
if (strncmp(base[i - 1].token, base[i].token, TOKMAXLEN) >= 0) {
/* %.*s is safe since all our tokens are ASCII */
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 = ok && CheckDateTokenTable("datetktbl", datetktbl, szdatetktbl);
ok = ok && CheckDateTokenTable("deltatktbl", deltatktbl, szdeltatktbl);
return ok;
}
/*
* Common code for temporal protransform functions. Types time, timetz,
* timestamp and timestamptz each have a range of allowed precisions. An
* unspecified precision is rigorously equivalent to the highest specifiable
* precision.
*
* Note: timestamp_scale throws an error when the typmod is out of range, but
* we can't get there from a cast: our typmodin will have caught it already.
*/
Node* TemporalTransform(int32 max_precis, Node* node)
{
FuncExpr* expr = (FuncExpr*)node;
Node* ret = NULL;
Node* typmod = NULL;
Assert(IsA(expr, FuncExpr));
Assert(list_length(expr->args) >= 2);
typmod = (Node*)lsecond(expr->args);
if (IsA(typmod, Const) && !((Const*)typmod)->constisnull) {
Node* source = (Node*)linitial(expr->args);
int32 old_precis = exprTypmod(source);
int32 new_precis = DatumGetInt32(((Const*)typmod)->constvalue);
if (new_precis < 0 || new_precis == max_precis || (old_precis >= 0 && new_precis >= old_precis))
ret = relabel_to_typmod(source, new_precis);
}
return ret;
}
/*
* This function gets called during timezone config file load or reload
* to create the final array of timezone tokens. The argument array
* is already sorted in name order. The data is converted to datetkn
* format and installed in *tbl, which must be allocated by the caller.
*/
void ConvertTimeZoneAbbrevs(TimeZoneAbbrevTable* tbl, struct tzEntry* abbrevs, int n)
{
datetkn* newtbl = tbl->abbrevs;
int i;
tbl->numabbrevs = n;
for (i = 0; i < n; i++) {
errno_t rc = strncpy_s(newtbl[i].token, TOKMAXLEN + 1, abbrevs[i].abbrev, TOKMAXLEN);
securec_check(rc, "\0", "\0");
newtbl[i].type = abbrevs[i].is_dst ? DTZ : TZ;
TOVAL(&newtbl[i], abbrevs[i].offset / MINS_PER_HOUR);
}
/* Check the ordering, if testing */
Assert(CheckDateTokenTable("timezone offset", newtbl, n));
}
/*
* Install a TimeZoneAbbrevTable as the active table.
*
* Caller is responsible that the passed table doesn't go away while in use.
*/
void InstallTimeZoneAbbrevs(TimeZoneAbbrevTable* tbl)
{
int i;
u_sess->time_cxt.timezone_tktbl = tbl->abbrevs;
u_sess->time_cxt.sz_timezone_tktbl = tbl->numabbrevs;
/* clear date cache in case it contains any stale timezone names */
for (i = 0; i < MAXDATEFIELDS; i++)
u_sess->time_cxt.datecache[i] = NULL;
}
/*
* This set-returning function reads all the available time zone abbreviations
* and returns a set of (abbrev, utc_offset, is_dst).
*/
Datum pg_timezone_abbrevs(PG_FUNCTION_ARGS)
{
FuncCallContext* funcctx = NULL;
int* pindex = NULL;
Datum result;
HeapTuple tuple;
Datum values[3];
bool nulls[3];
char buffer[TOKMAXLEN + 1];
unsigned char* p = NULL;
struct pg_tm tm;
Interval* resInterval = NULL;
/* stuff done only on the first call of the function */
if (SRF_IS_FIRSTCALL()) {
TupleDesc tupdesc;
MemoryContext oldcontext;
/* create a function context for cross-call persistence */
funcctx = SRF_FIRSTCALL_INIT();
/*
* switch to memory context appropriate for multiple function calls
*/
oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
/* allocate memory for user context */
pindex = (int*)palloc(sizeof(int));
*pindex = 0;
funcctx->user_fctx = (void*)pindex;
/*
* build tupdesc for result tuples. This must match this function's
* pg_proc entry!
*/
tupdesc = CreateTemplateTupleDesc(3, false);
TupleDescInitEntry(tupdesc, (AttrNumber)1, "abbrev", TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber)2, "utc_offset", INTERVALOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber)3, "is_dst", BOOLOID, -1, 0);
funcctx->tuple_desc = BlessTupleDesc(tupdesc);
MemoryContextSwitchTo(oldcontext);
}
/* stuff done on every call of the function */
funcctx = SRF_PERCALL_SETUP();
pindex = (int*)funcctx->user_fctx;
if (*pindex >= u_sess->time_cxt.sz_timezone_tktbl)
SRF_RETURN_DONE(funcctx);
errno_t errorno = EOK;
errorno = memset_s(nulls, sizeof(nulls), 0, sizeof(nulls));
securec_check(errorno, "\0", "\0");
/*
* Convert name to text, using upcasing conversion that is the inverse of
* what ParseDateTime() uses.
*/
errno_t rc = strncpy_s(buffer, TOKMAXLEN + 1, u_sess->time_cxt.timezone_tktbl[*pindex].token, TOKMAXLEN);
securec_check(rc, "\0", "\0");
buffer[TOKMAXLEN] = '\0'; /* may not be null-terminated */
for (p = (unsigned char*)buffer; *p; p++)
*p = pg_toupper(*p);
values[0] = CStringGetTextDatum(buffer);
rc = memset_s(&tm, sizeof(struct pg_tm), 0, sizeof(struct pg_tm));
securec_check(rc, "\0", "\0");
tm.tm_min = (-1) * FROMVAL(&u_sess->time_cxt.timezone_tktbl[*pindex]);
resInterval = (Interval*)palloc(sizeof(Interval));
tm2interval(&tm, 0, resInterval);
values[1] = IntervalPGetDatum(resInterval);
Assert(u_sess->time_cxt.timezone_tktbl[*pindex].type == DTZ || u_sess->time_cxt.timezone_tktbl[*pindex].type == TZ);
values[2] = BoolGetDatum(u_sess->time_cxt.timezone_tktbl[*pindex].type == DTZ);
(*pindex)++;
tuple = heap_form_tuple(funcctx->tuple_desc, values, nulls);
result = HeapTupleGetDatum(tuple);
SRF_RETURN_NEXT(funcctx, result);
}
/*
* This set-returning function reads all the available full time zones
* and returns a set of (name, abbrev, utc_offset, is_dst).
*/
Datum pg_timezone_names(PG_FUNCTION_ARGS)
{
MemoryContext oldcontext;
FuncCallContext* funcctx = NULL;
pg_tzenum* tzenum = NULL;
pg_tz* tz = NULL;
Datum result;
HeapTuple tuple;
Datum values[4];
bool nulls[4];
int tzoff;
struct pg_tm tm;
fsec_t fsec;
const char* tzn = NULL;
Interval* resInterval = NULL;
struct pg_tm itm;
/* stuff done only on the first call of the function */
if (SRF_IS_FIRSTCALL()) {
TupleDesc tupdesc;
/* create a function context for cross-call persistence */
funcctx = SRF_FIRSTCALL_INIT();
/*
* switch to memory context appropriate for multiple function calls
*/
oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
/* initialize timezone scanning code */
tzenum = pg_tzenumerate_start();
funcctx->user_fctx = (void*)tzenum;
/*
* build tupdesc for result tuples. This must match this function's
* pg_proc entry!
*/
tupdesc = CreateTemplateTupleDesc(4, false);
TupleDescInitEntry(tupdesc, (AttrNumber)1, "name", TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber)2, "abbrev", TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber)3, "utc_offset", INTERVALOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber)4, "is_dst", BOOLOID, -1, 0);
funcctx->tuple_desc = BlessTupleDesc(tupdesc);
MemoryContextSwitchTo(oldcontext);
}
/* stuff done on every call of the function */
funcctx = SRF_PERCALL_SETUP();
tzenum = (pg_tzenum*)funcctx->user_fctx;
/* search for another zone to display */
for (;;) {
oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
tz = pg_tzenumerate_next(tzenum);
MemoryContextSwitchTo(oldcontext);
if (NULL == tz) {
pg_tzenumerate_end(tzenum);
funcctx->user_fctx = NULL;
SRF_RETURN_DONE(funcctx);
}
/* Convert now() to local time in this zone */
if (timestamp2tm(GetCurrentTransactionStartTimestamp(), &tzoff, &tm, &fsec, &tzn, tz) != 0)
continue; /* ignore if conversion fails */
/* Ignore zic's rather silly "Factory" time zone */
if (tzn && strcmp(tzn, "Local time zone must be set--see zic manual page") == 0)
continue;
/* Found a displayable zone */
break;
}
errno_t errorno = EOK;
errorno = memset_s(nulls, sizeof(nulls), 0, sizeof(nulls));
securec_check(errorno, "\0", "\0");
values[0] = CStringGetTextDatum(pg_get_timezone_name(tz));
values[1] = CStringGetTextDatum(tzn ? tzn : "");
errorno = memset_s(&itm, sizeof(struct pg_tm), 0, sizeof(struct pg_tm));
securec_check(errorno, "\0", "\0");
itm.tm_sec = -tzoff;
resInterval = (Interval*)palloc(sizeof(Interval));
tm2interval(&itm, 0, resInterval);
values[2] = IntervalPGetDatum(resInterval);
values[3] = BoolGetDatum(tm.tm_isdst > 0);
tuple = heap_form_tuple(funcctx->tuple_desc, values, nulls);
result = HeapTupleGetDatum(tuple);
SRF_RETURN_NEXT(funcctx, result);
}
static void check_dtype (int dtype, struct pg_tm *tm, fsec_t fsec, Interval *result, char *str)
{
switch (dtype) {
case DTK_DELTA:
if (tm2interval(tm, fsec, result) != 0)
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("interval out of range")));
break;
case DTK_INVALID:
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("date/time value \"%s\" is no longer supported", str)));
break;
default:
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("unexpected dtype %d while parsing interval \"%s\"", dtype, str)));
}
}
Interval *char_to_interval(char *str, int32 typmod, bool can_ignore) {
Interval *result = NULL;
fsec_t fsec = 0;
struct pg_tm tt, *tm = &tt;
int dtype;
int nf;
int range = INTERVAL_FULL_RANGE;
int dterr;
char *field[MAXDATEFIELDS];
int ftype[MAXDATEFIELDS];
char workbuf[256];
// negative ISO8601 interval flag
bool isnegative = false;
tm->tm_year = 0;
tm->tm_mon = 0;
tm->tm_mday = 0;
tm->tm_hour = 0;
tm->tm_min = 0;
tm->tm_sec = 0;
if (typmod >= 0)
range = INTERVAL_RANGE(typmod);
dterr = ParseDateTime(str, workbuf, sizeof(workbuf), field, ftype, MAXDATEFIELDS, &nf);
if (dterr == 0)
dterr = DecodeInterval(field, ftype, nf, range, &dtype, tm, &fsec);
/* if those functions think it's a bad format, try ISO8601 style */
if (dterr == DTERR_BAD_FORMAT) {
while (' ' == *str) {
str++;
}
if ('-' == *str) {
isnegative = true;
str++;
}
dterr = DecodeISO8601Interval(str, &dtype, tm, &fsec);
}
if (dterr != 0) {
if (dterr == DTERR_FIELD_OVERFLOW)
dterr = DTERR_INTERVAL_OVERFLOW;
DateTimeParseError(dterr, str, "interval", can_ignore);
/* if invalid input error is ignorable, set the result to 0 */
tm->tm_year = 0;
tm->tm_mon = 0;
tm->tm_mday = 0;
tm->tm_hour = 0;
tm->tm_min = 0;
tm->tm_sec = 0;
}
// process negative ISO8601 interval
if (true == isnegative) {
tm->tm_year = -tm->tm_year;
tm->tm_mon = -tm->tm_mon;
tm->tm_mday = -tm->tm_mday;
tm->tm_hour = -tm->tm_hour;
tm->tm_min = -tm->tm_min;
tm->tm_sec = -tm->tm_sec;
fsec = -fsec;
}
result = (Interval *) palloc(sizeof(Interval));
check_dtype (dtype, tm, fsec, result, str);
return result;
}
static int DateFormatCheck(int &tmType, char* cp, char key)
{
const char *begin = 0;
if (isdigit((unsigned char)*cp)) {
begin = cp;
tmType = strtoi(begin, &cp, 10);
if (begin == cp || tmType < 0 || *cp != key) {
return DTERR_FIELD_OVERFLOW;
}
cp++;
} else {
return DTERR_BAD_FORMAT;
}
return 0;
}
int ParseIudDateOnly(char* str, struct pg_tm* tm)
{
char* cp = str;
int check = 0;
//year
check = DateFormatCheck(tm->tm_year, cp, '-');
// DTERR_FIELD_OVERFLOW and DTERR_BAD_FORMAT less than 0
if (check < 0) {
return check;
}
//month
check = DateFormatCheck(tm->tm_mon, cp, '-');
if (check < 0) {
return check;
}
//day
return DateFormatCheck(tm->tm_mday, cp, ' ');
}
int ParseIudDateTime(char* str, struct pg_tm* tm, fsec_t* fsec)
{
char* cp = str;
//Decode date
*fsec = 0;
unsigned int fmask = 0,tmask;
int check = 0;
//year
check = DateFormatCheck(tm->tm_year, cp, '-');
// DTERR_FIELD_OVERFLOW and DTERR_BAD_FORMAT less than 0
if (check < 0) {
return check;
}
//month
check = DateFormatCheck(tm->tm_mon, cp, '-');
if (check < 0) {
return check;
}
//day
check = DateFormatCheck(tm->tm_mon, cp, ' ');
if (check < 0) {
return check;
}
//Decode time
int dterr = DecodeTime(cp, fmask, INTERVAL_FULL_RANGE, &tmask, tm, fsec);
if (dterr) {
return dterr;
}
/* do final checking/adjustment of Y/M/D fields */
dterr = ValidateDate(fmask, false, false, false, tm);
if (dterr) {
return dterr;
}
return 0;
}
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