/* tm2timestamp()
* Convert a tm structure to a timestamp data type.
* Note that year is _not_ 1900-based, but is an explicit full value.
* Also, month is one-based, _not_ zero-based.
*
* Returns -1 on failure (overflow).
*/
int
tm2timestamp(struct tm * tm, fsec_t fsec, int *tzp, timestamp * result)
{
#ifdef HAVE_INT64_TIMESTAMP
int dDate;
int64 time;
#else
double dDate,
time;
#endif
/* Julian day routines are not correct for negative Julian days */
if (!IS_VALID_JULIAN(tm->tm_year, tm->tm_mon, tm->tm_mday))
return -1;
dDate = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - date2j(2000, 1, 1);
time = time2t(tm->tm_hour, tm->tm_min, tm->tm_sec, fsec);
#ifdef HAVE_INT64_TIMESTAMP
*result = (dDate * USECS_PER_DAY) + time;
/* check for major overflow */
if ((*result - time) / USECS_PER_DAY != dDate)
return -1;
/* check for just-barely overflow (okay except time-of-day wraps) */
if ((*result < 0 && dDate >= 0) ||
(*result >= 0 && dDate < 0))
return -1;
#else
*result = dDate * SECS_PER_DAY + time;
#endif
if (tzp != NULL)
*result = dt2local(*result, -(*tzp));
return 0;
} /* tm2timestamp() */
void
PGTYPESdate_mdyjul(int *mdy, date * jdate)
{
/* month is mdy[0] */
/* day is mdy[1] */
/* year is mdy[2] */
*jdate = (date) (date2j(mdy[2], mdy[0], mdy[1]) - date2j(2000, 1, 1));
}
void
PGTYPESdate_today(date * d)
{
struct tm ts;
GetCurrentDateTime(&ts);
*d = date2j(ts.tm_year, ts.tm_mon, ts.tm_mday) - date2j(2000, 1, 1);
return;
}
date
PGTYPESdate_from_asc(char *str, char **endptr)
{
date dDate;
fsec_t fsec;
struct tm tt,
*tm = &tt;
int dtype;
int nf;
char *field[MAXDATEFIELDS];
int ftype[MAXDATEFIELDS];
char lowstr[MAXDATELEN + 1];
char *realptr;
char **ptr = (endptr != NULL) ? endptr : &realptr;
bool EuroDates = FALSE;
errno = 0;
if (strlen(str) >= sizeof(lowstr))
{
errno = PGTYPES_DATE_BAD_DATE;
return INT_MIN;
}
if (ParseDateTime(str, lowstr, field, ftype, &nf, ptr) != 0 ||
DecodeDateTime(field, ftype, nf, &dtype, tm, &fsec, EuroDates) != 0)
{
errno = PGTYPES_DATE_BAD_DATE;
return INT_MIN;
}
switch (dtype)
{
case DTK_DATE:
break;
case DTK_EPOCH:
if (GetEpochTime(tm) < 0)
{
errno = PGTYPES_DATE_BAD_DATE;
return INT_MIN;
}
break;
default:
errno = PGTYPES_DATE_BAD_DATE;
return INT_MIN;
}
dDate = (date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - date2j(2000, 1, 1));
return dDate;
}
Datum
plvdate_days_inmonth(PG_FUNCTION_ARGS)
{
DateADT day = PG_GETARG_DATEADT(0);
int result;
int y, m, d;
j2date(day + POSTGRES_EPOCH_JDATE, &y, &m, &d);
result = date2j(y, m+1, 1) - date2j(y, m, 1);
PG_RETURN_INT32(result);
}
/*
* returns true, when day d is any easter holiday.
*
*/
static bool
easter_holidays(DateADT day, int y, int m)
{
if (use_great_friday || use_easter)
{
if (m == 3 || m == 4)
{
int easter_sunday_day;
int easter_sunday_month;
int easter_sunday;
calc_easter_sunday(y, &easter_sunday_day, &easter_sunday_month);
easter_sunday = date2j(y, easter_sunday_month, easter_sunday_day) - POSTGRES_EPOCH_JDATE;
if (use_easter && (day == easter_sunday || day == easter_sunday + 1))
return true;
if (use_great_friday && day == easter_sunday - 2)
{
/* Great Friday is introduced in Czech Republic in 2016 */
if (country_id == 0)
{
if (y >= 2016)
return true;
}
else
return true;
}
}
}
return false;
}
Datum
add_months(PG_FUNCTION_ARGS)
{
DateADT day = PG_GETARG_DATEADT(0);
int n = PG_GETARG_INT32(1);
int y, m, d;
int days;
DateADT result;
div_t v;
bool last_day;
j2date(day + POSTGRES_EPOCH_JDATE, &y, &m, &d);
last_day = (d == days_of_month(y, m));
v = div(y * 12 + m - 1 + n, 12);
y = v.quot;
if (y < 0)
y += 1; /* offset because of year 0 */
m = v.rem + 1;
days = days_of_month(y, m);
if (last_day || d > days)
d = days;
result = date2j(y, m, d) - POSTGRES_EPOCH_JDATE;
PG_RETURN_DATEADT (result);
}
int
PGTYPESdate_dayofweek(date dDate)
{
/*
* Sunday: 0 Monday: 1 Tuesday: 2 Wednesday: 3 Thursday: 4
* Friday: 5 Saturday: 6
*/
return (int) (dDate + date2j(2000, 1, 1) + 1) % 7;
}
Datum
last_day(PG_FUNCTION_ARGS)
{
DateADT day = PG_GETARG_DATEADT(0);
DateADT result;
int y, m, d;
j2date(day + POSTGRES_EPOCH_JDATE, &y, &m, &d);
result = date2j(y, m+1, 1) - POSTGRES_EPOCH_JDATE;
PG_RETURN_DATEADT(result - 1);
}
void
PGTYPESdate_julmdy(date jd, int *mdy)
{
int y,
m,
d;
j2date((int) (jd + date2j(2000, 1, 1)), &y, &m, &d);
mdy[0] = m;
mdy[1] = d;
mdy[2] = y;
}
char *
PGTYPESdate_to_asc(date dDate)
{
struct tm tt,
*tm = &tt;
char buf[MAXDATELEN + 1];
int DateStyle = 1;
bool EuroDates = FALSE;
j2date(dDate + date2j(2000, 1, 1), &(tm->tm_year), &(tm->tm_mon), &(tm->tm_mday));
EncodeDateOnly(tm, DateStyle, buf, EuroDates);
return pgtypes_strdup(buf);
}
/* tm2timestamp()
* Convert a tm structure to a timestamp data type.
* Note that year is _not_ 1900-based, but is an explicit full value.
* Also, month is one-based, _not_ zero-based.
*
* Returns -1 on failure (overflow).
*/
int
tm2timestamp(struct tm * tm, fsec_t fsec, int *tzp, timestamp * result)
{
#ifdef HAVE_INT64_TIMESTAMP
int dDate;
int64 time;
#else
double dDate,
time;
#endif
/* Prevent overflow in Julian-day routines */
if (!IS_VALID_JULIAN(tm->tm_year, tm->tm_mon, tm->tm_mday))
return -1;
dDate = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - date2j(2000, 1, 1);
time = time2t(tm->tm_hour, tm->tm_min, tm->tm_sec, fsec);
#ifdef HAVE_INT64_TIMESTAMP
*result = (dDate * USECS_PER_DAY) + time;
/* check for major overflow */
if ((*result - time) / USECS_PER_DAY != dDate)
return -1;
/* check for just-barely overflow (okay except time-of-day wraps) */
/* caution: we want to allow 1999-12-31 24:00:00 */
if ((*result < 0 && dDate > 0) ||
(*result > 0 && dDate < -1))
return -1;
#else
*result = dDate * SECS_PER_DAY + time;
#endif
if (tzp != NULL)
*result = dt2local(*result, -(*tzp));
/* final range check catches just-out-of-range timestamps */
if (!IS_VALID_TIMESTAMP(*result))
return -1;
return 0;
} /* tm2timestamp() */
Datum get_semester(PG_FUNCTION_ARGS) {
pg_tm current_date;
GetCurrentDateTime(¤t_date);
DateADT entering_date = DatumGetDateADT(PG_GETARG_DATUM(0));
int entering_year, entering_month, entering_day;
j2date(entering_date + date2j(2000, 1, 1), &entering_year, &entering_month, &entering_day);
int semester = (current_date.tm_year - entering_year) * 2;
if (current_date.tm_mon > 6)
semester++;
PG_RETURN_INT32(semester);
}
/* tm2abstime()
* Convert a tm structure to abstime.
* Note that tm has full year (not 1900-based) and 1-based month.
*/
static AbsoluteTime
tm2abstime(struct pg_tm * tm, int tz)
{
int day;
AbsoluteTime sec;
/* validate, before going out of range on some members */
if (tm->tm_year < 1901 || tm->tm_year > 2038 ||
tm->tm_mon < 1 || tm->tm_mon > MONTHS_PER_YEAR ||
tm->tm_mday < 1 || tm->tm_mday > 31 ||
tm->tm_hour < 0 ||
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)) ||
tm->tm_min < 0 || tm->tm_min > MINS_PER_HOUR - 1 ||
tm->tm_sec < 0 || tm->tm_sec > SECS_PER_MINUTE)
return INVALID_ABSTIME;
day = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - UNIX_EPOCH_JDATE;
/* check for time out of range */
if (day < MIN_DAYNUM || day > MAX_DAYNUM)
return INVALID_ABSTIME;
/* convert to seconds */
sec = tm->tm_sec + tz + (tm->tm_min + (day * HOURS_PER_DAY + tm->tm_hour) * MINS_PER_HOUR) * SECS_PER_MINUTE;
/*
* check for overflow. We need a little slop here because the H/M/S plus
* TZ offset could add up to more than 1 day.
*/
if ((day >= MAX_DAYNUM - 10 && sec < 0) ||
(day <= MIN_DAYNUM + 10 && sec > 0))
return INVALID_ABSTIME;
/* check for reserved values (e.g. "current" on edge of usual range */
if (!AbsoluteTimeIsReal(sec))
return INVALID_ABSTIME;
return sec;
}
/*
* PGTYPESdate_defmt_asc
*
* function works as follows:
* - first we analyze the paramters
* - if this is a special case with no delimiters, add delimters
* - find the tokens. First we look for numerical values. If we have found
* less than 3 tokens, we check for the months' names and thereafter for
* the abbreviations of the months' names.
* - then we see which parameter should be the date, the month and the
* year and from these values we calculate the date
*/
#define PGTYPES_DATE_MONTH_MAXLENGTH 20 /* probably even less :-) */
int
PGTYPESdate_defmt_asc(date * d, char *fmt, char *str)
{
/*
* token[2] = { 4,6 } means that token 2 starts at position 4 and ends at
* (including) position 6
*/
int token[3][2];
int token_values[3] = {-1, -1, -1};
char *fmt_token_order;
char *fmt_ystart,
*fmt_mstart,
*fmt_dstart;
int i;
int reading_digit;
int token_count;
char *str_copy;
struct tm tm;
tm.tm_year = tm.tm_mon = tm.tm_mday = 0; /* keep compiler quiet */
if (!d || !str || !fmt)
{
errno = PGTYPES_DATE_ERR_EARGS;
return -1;
}
/* analyze the fmt string */
fmt_ystart = strstr(fmt, "yy");
fmt_mstart = strstr(fmt, "mm");
fmt_dstart = strstr(fmt, "dd");
if (!fmt_ystart || !fmt_mstart || !fmt_dstart)
{
errno = PGTYPES_DATE_ERR_EARGS;
return -1;
}
if (fmt_ystart < fmt_mstart)
{
/* y m */
if (fmt_dstart < fmt_ystart)
{
/* d y m */
fmt_token_order = "dym";
}
else if (fmt_dstart > fmt_mstart)
{
/* y m d */
fmt_token_order = "ymd";
}
else
{
/* y d m */
fmt_token_order = "ydm";
}
}
else
{
/* fmt_ystart > fmt_mstart */
/* m y */
if (fmt_dstart < fmt_mstart)
{
/* d m y */
fmt_token_order = "dmy";
}
else if (fmt_dstart > fmt_ystart)
{
/* m y d */
fmt_token_order = "myd";
}
else
{
/* m d y */
fmt_token_order = "mdy";
}
}
/*
* handle the special cases where there is no delimiter between the
* digits. If we see this:
*
* only digits, 6 or 8 bytes then it might be ddmmyy and ddmmyyyy (or
* similar)
*
* we reduce it to a string with delimiters and continue processing
*/
/* check if we have only digits */
reading_digit = 1;
for (i = 0; str[i]; i++)
{
if (!isdigit((unsigned char) str[i]))
{
reading_digit = 0;
break;
}
}
if (reading_digit)
{
int frag_length[3];
int target_pos;
i = strlen(str);
if (i != 8 && i != 6)
{
errno = PGTYPES_DATE_ERR_ENOSHORTDATE;
return -1;
}
/* okay, this really is the special case */
/*
* as long as the string, one additional byte for the terminator and 2
* for the delimiters between the 3 fiedls
*/
str_copy = pgtypes_alloc(strlen(str) + 1 + 2);
if (!str_copy)
return -1;
/* determine length of the fragments */
if (i == 6)
{
frag_length[0] = 2;
frag_length[1] = 2;
frag_length[2] = 2;
}
else
{
if (fmt_token_order[0] == 'y')
{
frag_length[0] = 4;
frag_length[1] = 2;
frag_length[2] = 2;
}
else if (fmt_token_order[1] == 'y')
{
frag_length[0] = 2;
frag_length[1] = 4;
frag_length[2] = 2;
}
else
{
frag_length[0] = 2;
frag_length[1] = 2;
frag_length[2] = 4;
}
}
target_pos = 0;
/*
* XXX: Here we could calculate the positions of the tokens and save
* the for loop down there where we again check with isdigit() for
* digits.
*/
for (i = 0; i < 3; i++)
{
int start_pos = 0;
if (i >= 1)
start_pos += frag_length[0];
if (i == 2)
start_pos += frag_length[1];
strncpy(str_copy + target_pos, str + start_pos,
frag_length[i]);
target_pos += frag_length[i];
if (i != 2)
{
str_copy[target_pos] = ' ';
target_pos++;
}
}
str_copy[target_pos] = '\0';
}
else
{
str_copy = pgtypes_strdup(str);
if (!str_copy)
return -1;
/* convert the whole string to lower case */
for (i = 0; str_copy[i]; i++)
str_copy[i] = (char) pg_tolower((unsigned char) str_copy[i]);
}
/* look for numerical tokens */
reading_digit = 0;
token_count = 0;
for (i = 0; i < strlen(str_copy); i++)
{
if (!isdigit((unsigned char) str_copy[i]) && reading_digit)
{
/* the token is finished */
token[token_count][1] = i - 1;
reading_digit = 0;
token_count++;
}
else if (isdigit((unsigned char) str_copy[i]) && !reading_digit)
{
/* we have found a token */
token[token_count][0] = i;
reading_digit = 1;
}
}
/*
* we're at the end of the input string, but maybe we are still reading a
* number...
*/
if (reading_digit)
{
token[token_count][1] = i - 1;
token_count++;
}
if (token_count < 2)
{
/*
* not all tokens found, no way to find 2 missing tokens with string
* matches
*/
free(str_copy);
errno = PGTYPES_DATE_ERR_ENOSHORTDATE;
return -1;
}
if (token_count != 3)
{
/*
* not all tokens found but we may find another one with string
* matches by testing for the months names and months abbreviations
*/
char *month_lower_tmp = pgtypes_alloc(PGTYPES_DATE_MONTH_MAXLENGTH);
char *start_pos;
int j;
int offset;
int found = 0;
char **list;
if (!month_lower_tmp)
{
/* free variables we alloc'ed before */
free(str_copy);
return -1;
}
list = pgtypes_date_months;
for (i = 0; list[i]; i++)
{
for (j = 0; j < PGTYPES_DATE_MONTH_MAXLENGTH; j++)
{
month_lower_tmp[j] = (char) pg_tolower((unsigned char) list[i][j]);
if (!month_lower_tmp[j])
{
/* properly terminated */
break;
}
}
if ((start_pos = strstr(str_copy, month_lower_tmp)))
{
offset = start_pos - str_copy;
/*
* sort the new token into the numeric tokens, shift them if
* necessary
*/
if (offset < token[0][0])
{
token[2][0] = token[1][0];
token[2][1] = token[1][1];
token[1][0] = token[0][0];
token[1][1] = token[0][1];
token_count = 0;
}
else if (offset < token[1][0])
{
token[2][0] = token[1][0];
token[2][1] = token[1][1];
token_count = 1;
}
else
token_count = 2;
token[token_count][0] = offset;
token[token_count][1] = offset + strlen(month_lower_tmp) - 1;
/*
* the value is the index of the month in the array of months
* + 1 (January is month 0)
*/
token_values[token_count] = i + 1;
found = 1;
break;
}
/*
* evil[tm] hack: if we read the pgtypes_date_months and haven't
* found a match, reset list to point to pgtypes_date_months_short
* and reset the counter variable i
*/
if (list == pgtypes_date_months)
{
if (list[i + 1] == NULL)
{
list = months;
i = -1;
}
}
}
if (!found)
{
free(month_lower_tmp);
free(str_copy);
errno = PGTYPES_DATE_ERR_ENOTDMY;
return -1;
}
/*
* here we found a month. token[token_count] and
* token_values[token_count] reflect the month's details.
*
* only the month can be specified with a literal. Here we can do a
* quick check if the month is at the right position according to the
* format string because we can check if the token that we expect to
* be the month is at the position of the only token that already has
* a value. If we wouldn't check here we could say "December 4 1990"
* with a fmt string of "dd mm yy" for 12 April 1990.
*/
if (fmt_token_order[token_count] != 'm')
{
/* deal with the error later on */
token_values[token_count] = -1;
}
free(month_lower_tmp);
}
/* terminate the tokens with ASCII-0 and get their values */
for (i = 0; i < 3; i++)
{
*(str_copy + token[i][1] + 1) = '\0';
/* A month already has a value set, check for token_value == -1 */
if (token_values[i] == -1)
{
errno = 0;
token_values[i] = strtol(str_copy + token[i][0], (char **) NULL, 10);
/* strtol sets errno in case of an error */
if (errno)
token_values[i] = -1;
}
if (fmt_token_order[i] == 'd')
tm.tm_mday = token_values[i];
else if (fmt_token_order[i] == 'm')
tm.tm_mon = token_values[i];
else if (fmt_token_order[i] == 'y')
tm.tm_year = token_values[i];
}
free(str_copy);
if (tm.tm_mday < 1 || tm.tm_mday > 31)
{
errno = PGTYPES_DATE_BAD_DAY;
return -1;
}
if (tm.tm_mon < 1 || tm.tm_mon > MONTHS_PER_YEAR)
{
errno = PGTYPES_DATE_BAD_MONTH;
return -1;
}
if (tm.tm_mday == 31 && (tm.tm_mon == 4 || tm.tm_mon == 6 || tm.tm_mon == 9 || tm.tm_mon == 11))
{
errno = PGTYPES_DATE_BAD_DAY;
return -1;
}
if (tm.tm_mon == 2 && tm.tm_mday > 29)
{
errno = PGTYPES_DATE_BAD_DAY;
return -1;
}
*d = date2j(tm.tm_year, tm.tm_mon, tm.tm_mday) - date2j(2000, 1, 1);
return 0;
}
int
PGTYPESdate_fmt_asc(date dDate, char *fmtstring, char *outbuf)
{
static struct
{
char *format;
int component;
} mapping[] =
{
/*
* format items have to be sorted according to their length, since the
* first pattern that matches gets replaced by its value
*/
{
"ddd", PGTYPES_FMTDATE_DOW_LITERAL_SHORT
},
{
"dd", PGTYPES_FMTDATE_DAY_DIGITS_LZ
},
{
"mmm", PGTYPES_FMTDATE_MONTH_LITERAL_SHORT
},
{
"mm", PGTYPES_FMTDATE_MONTH_DIGITS_LZ
},
{
"yyyy", PGTYPES_FMTDATE_YEAR_DIGITS_LONG
},
{
"yy", PGTYPES_FMTDATE_YEAR_DIGITS_SHORT
},
{
NULL, 0
}
};
union un_fmt_comb replace_val;
int replace_type;
int i;
int dow;
char *start_pattern;
struct tm tm;
/* copy the string over */
strcpy(outbuf, fmtstring);
/* get the date */
j2date(dDate + date2j(2000, 1, 1), &(tm.tm_year), &(tm.tm_mon), &(tm.tm_mday));
dow = PGTYPESdate_dayofweek(dDate);
for (i = 0; mapping[i].format != NULL; i++)
{
while ((start_pattern = strstr(outbuf, mapping[i].format)) != NULL)
{
switch (mapping[i].component)
{
case PGTYPES_FMTDATE_DOW_LITERAL_SHORT:
replace_val.str_val = pgtypes_date_weekdays_short[dow];
replace_type = PGTYPES_TYPE_STRING_CONSTANT;
break;
case PGTYPES_FMTDATE_DAY_DIGITS_LZ:
replace_val.uint_val = tm.tm_mday;
replace_type = PGTYPES_TYPE_UINT_2_LZ;
break;
case PGTYPES_FMTDATE_MONTH_LITERAL_SHORT:
replace_val.str_val = months[tm.tm_mon - 1];
replace_type = PGTYPES_TYPE_STRING_CONSTANT;
break;
case PGTYPES_FMTDATE_MONTH_DIGITS_LZ:
replace_val.uint_val = tm.tm_mon;
replace_type = PGTYPES_TYPE_UINT_2_LZ;
break;
case PGTYPES_FMTDATE_YEAR_DIGITS_LONG:
replace_val.uint_val = tm.tm_year;
replace_type = PGTYPES_TYPE_UINT_4_LZ;
break;
case PGTYPES_FMTDATE_YEAR_DIGITS_SHORT:
replace_val.uint_val = tm.tm_year % 100;
replace_type = PGTYPES_TYPE_UINT_2_LZ;
break;
default:
/*
* should not happen, set something anyway
*/
replace_val.str_val = " ";
replace_type = PGTYPES_TYPE_STRING_CONSTANT;
}
switch (replace_type)
{
case PGTYPES_TYPE_STRING_MALLOCED:
case PGTYPES_TYPE_STRING_CONSTANT:
strncpy(start_pattern, replace_val.str_val,
strlen(replace_val.str_val));
if (replace_type == PGTYPES_TYPE_STRING_MALLOCED)
free(replace_val.str_val);
break;
case PGTYPES_TYPE_UINT:
{
char *t = pgtypes_alloc(PGTYPES_DATE_NUM_MAX_DIGITS);
if (!t)
return -1;
snprintf(t, PGTYPES_DATE_NUM_MAX_DIGITS,
"%u", replace_val.uint_val);
strncpy(start_pattern, t, strlen(t));
free(t);
}
break;
case PGTYPES_TYPE_UINT_2_LZ:
{
char *t = pgtypes_alloc(PGTYPES_DATE_NUM_MAX_DIGITS);
if (!t)
return -1;
snprintf(t, PGTYPES_DATE_NUM_MAX_DIGITS,
"%02u", replace_val.uint_val);
strncpy(start_pattern, t, strlen(t));
free(t);
}
break;
case PGTYPES_TYPE_UINT_4_LZ:
{
char *t = pgtypes_alloc(PGTYPES_DATE_NUM_MAX_DIGITS);
if (!t)
return -1;
snprintf(t, PGTYPES_DATE_NUM_MAX_DIGITS,
"%04u", replace_val.uint_val);
strncpy(start_pattern, t, strlen(t));
free(t);
}
break;
default:
/*
* doesn't happen (we set replace_type to
* PGTYPES_TYPE_STRING_CONSTANT in case of an error above)
*/
break;
}
}
}
return 0;
}
/* timestamptz_pl_interval()
* Add a interval to a timestamp with time zone data type.
* Note that interval has provisions for qualitative year/month
* units, so try to do the right thing with them.
* To add a month, increment the month, and use the same day of month.
* Then, if the next month has fewer days, set the day of month
* to the last day of month.
* Lastly, add in the "quantitative time".
*/
TimestampTz
timestamptz_pl_interval(TimestampTz timestamp, Interval *span)
{
TimestampTz result;
int tz;
if (TIMESTAMP_NOT_FINITE(timestamp))
result = timestamp;
else
{
if (span->month != 0)
{
struct tm tt,
*tm = &tt;
fsec_t fsec;
if (timestamp2tm(timestamp, &tz, tm, &fsec, NULL, NULL) != 0)
warnx("timestamp out of range");
tm->tm_mon += span->month;
if (tm->tm_mon > MONTHS_PER_YEAR)
{
tm->tm_year += (tm->tm_mon - 1) / MONTHS_PER_YEAR;
tm->tm_mon = ((tm->tm_mon - 1) % MONTHS_PER_YEAR) + 1;
}
else if (tm->tm_mon < 1)
{
tm->tm_year += tm->tm_mon / MONTHS_PER_YEAR - 1;
tm->tm_mon = tm->tm_mon % MONTHS_PER_YEAR + MONTHS_PER_YEAR;
}
/* adjust for end of month boundary problems... */
if (tm->tm_mday > day_tab[isleap(tm->tm_year)][tm->tm_mon - 1])
tm->tm_mday = (day_tab[isleap(tm->tm_year)][tm->tm_mon - 1]);
tz = DetermineTimeZoneOffset(tm, session_timezone);
if (tm2timestamp(tm, fsec, &tz, ×tamp) != 0)
warnx("timestamp out of range");
}
if (span->day != 0)
{
struct tm tt,
*tm = &tt;
fsec_t fsec;
int julian;
if (timestamp2tm(timestamp, &tz, tm, &fsec, NULL, NULL) != 0)
warnx("timestamp out of range");
/* Add days by converting to and from julian */
julian = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) + span->day;
j2date(julian, &tm->tm_year, &tm->tm_mon, &tm->tm_mday);
tz = DetermineTimeZoneOffset(tm, session_timezone);
if (tm2timestamp(tm, fsec, &tz, ×tamp) != 0)
warnx("timestamp out of range");
}
timestamp += span->time;
result = timestamp;
}
return result;
}
/* 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 tm *tm, fsec_t *fsec, int *tzp)
{
int fmask = 0,
tmask,
type;
int ptype = 0; /* "prefix type" for ISO y2001m02d04 format */
int i;
int val;
int dterr;
int mer = HR24;
bool haveTextMonth = FALSE;
bool isjulian = FALSE;
bool is2digits = FALSE;
bool bc = FALSE;
pg_tz *namedTz = NULL;
struct 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;
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;
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 (!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.
*/
warnx("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:
/*
* This might be an ISO time following a "t" field.
*/
if (ptype != 0)
{
/* Sanity check; should not fail this test */
if (ptype != DTK_TIME)
return DTERR_BAD_FORMAT;
ptype = 0;
}
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;
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;
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:
warnx("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;
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 (!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)
{
/* 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 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 && HasCTZSet)
{
tm->tm_isdst = 0; /* for lack of a better idea */
return 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;
}
/* timestamp2tm()
* Convert timestamp data type to POSIX time structure.
* Note that year is _not_ 1900-based, but is an explicit full value.
* Also, month is one-based, _not_ zero-based.
* Returns:
* 0 on success
* -1 on out of range
*
* For dates within the system-supported time_t range, convert to the
* local time zone. If out of this range, leave as GMT. - tgl 97/05/27
*/
static int
timestamp2tm(timestamp dt, int *tzp, struct tm * tm, fsec_t *fsec, char **tzn)
{
#ifdef HAVE_INT64_TIMESTAMP
int dDate, date0;
int64 time;
#else
double dDate, date0;
double time;
#endif
time_t utime;
#if defined(HAVE_TM_ZONE) || defined(HAVE_INT_TIMEZONE)
struct tm *tx;
#endif
date0 = date2j(2000, 1, 1);
time = dt;
#ifdef HAVE_INT64_TIMESTAMP
TMODULO(time, dDate, INT64CONST(86400000000));
if (time < INT64CONST(0))
{
time += INT64CONST(86400000000);
dDate -= 1;
}
#else
TMODULO(time, dDate, 86400e0);
if (time < 0)
{
time += 86400;
dDate -= 1;
}
#endif
/* Julian day routine does not work for negative Julian days */
if (dDate < -date0)
return -1;
/* add offset to go from J2000 back to standard Julian date */
dDate += date0;
j2date((int) dDate, &tm->tm_year, &tm->tm_mon, &tm->tm_mday);
dt2time(time, &tm->tm_hour, &tm->tm_min, &tm->tm_sec, fsec);
if (tzp != NULL)
{
/*
* Does this fall within the capabilities of the localtime()
* interface? Then use this to rotate to the local time zone.
*/
if (IS_VALID_UTIME(tm->tm_year, tm->tm_mon, tm->tm_mday))
{
#ifdef HAVE_INT64_TIMESTAMP
utime = ((dt / INT64CONST(1000000))
+ ((date0 - date2j(1970, 1, 1)) * INT64CONST(86400)));
#else
utime = (dt + ((date0 - date2j(1970, 1, 1)) * 86400));
#endif
#if defined(HAVE_TM_ZONE) || defined(HAVE_INT_TIMEZONE)
tx = localtime(&utime);
tm->tm_year = tx->tm_year + 1900;
tm->tm_mon = tx->tm_mon + 1;
tm->tm_mday = tx->tm_mday;
tm->tm_hour = tx->tm_hour;
tm->tm_min = tx->tm_min;
tm->tm_isdst = tx->tm_isdst;
#if defined(HAVE_TM_ZONE)
tm->tm_gmtoff = tx->tm_gmtoff;
tm->tm_zone = tx->tm_zone;
*tzp = -(tm->tm_gmtoff); /* tm_gmtoff is Sun/DEC-ism */
if (tzn != NULL)
*tzn = (char *) tm->tm_zone;
#elif defined(HAVE_INT_TIMEZONE)
*tzp = ((tm->tm_isdst > 0) ? (TIMEZONE_GLOBAL - 3600) : TIMEZONE_GLOBAL);
if (tzn != NULL)
*tzn = tzname[(tm->tm_isdst > 0)];
#endif
#else /* not (HAVE_TM_ZONE || HAVE_INT_TIMEZONE) */
*tzp = 0;
/* Mark this as *no* time zone available */
tm->tm_isdst = -1;
if (tzn != NULL)
*tzn = NULL;
#endif
dt = dt2local(dt, *tzp);
}
else
{
*tzp = 0;
/* Mark this as *no* time zone available */
tm->tm_isdst = -1;
if (tzn != NULL)
*tzn = NULL;
}
}
else
{
tm->tm_isdst = -1;
if (tzn != NULL)
*tzn = NULL;
}
return 0;
} /* timestamp2tm() */
static DateADT
_ora_date_round(DateADT day, int f)
{
int y, m, d, z;
DateADT result;
j2date(day + POSTGRES_EPOCH_JDATE, &y, &m, &d);
switch (f)
{
CASE_fmt_CC
if (y > 0)
result = DATE2J((y/100)*100+(day < DATE2J((y/100)*100+50,1,1) ?1:101),1,1);
else
result = DATE2J((y/100)*100+(day < DATE2J((y/100)*100-50+1,1,1) ?-99:1),1,1);
break;
CASE_fmt_YYYY
result = DATE2J(y+(day<DATE2J(y,7,1)?0:1),1,1);
break;
CASE_fmt_IYYY
{
if (day < DATE2J(y,7,1))
{
result = iso_year(y, m, d);
}
else
{
DateADT iy1 = iso_year(y+1, 1, 8);
result = iy1;
if (((day - DATE2J(y,1,1)) / 7 + 1) >= 52)
{
bool overl = ((date2j(y+2,1,1)-date2j(y+1,1,1)) == 366);
bool isSaturday = (J2DAY(day) == 6);
DateADT iy2 = iso_year(y+2, 1, 8);
DateADT day1 = DATE2J(y+1,1,1);
/* exception saturdays */
if (iy1 >= (day1) && day >= day1 - 2 && isSaturday)
{
result = overl?iy2:iy1;
}
/* iso year stars in last year and day >= iso year */
else if (iy1 <= (day1) && day >= iy1 - 3)
{
DateADT cmp = iy1 - (iy1 < day1?0:1);
int d = J2DAY(day1);
/* some exceptions */
if ((day >= cmp - 2) && (!(d == 3 && overl)))
{
/* if year don't starts in thursday */
if ((d < 4 && J2DAY(day) != 5 && !isSaturday)
||(d == 2 && isSaturday && overl))
{
result = iy2;
}
}
}
}
}
break;
}
CASE_fmt_MON
result = DATE2J(y,m+(day<DATE2J(y,m,16)?0:1),1);
break;
CASE_fmt_WW
z = (day - DATE2J(y,1,1)) % 7;
result = day - z + (z < 4?0:7);
break;
CASE_fmt_IW
{
z = (day - iso_year(y,m,d)) % 7;
result = day - z + (z < 4?0:7);
if (((day - DATE2J(y,1,1)) / 7 + 1) >= 52)
{
/* only for last iso week */
DateADT isoyear = iso_year(y+1, 1, 8);
if (isoyear > (DATE2J(y+1,1,1)-1))
if (day > isoyear - 7)
{
int d = J2DAY(day);
result -= (d == 0 || d > 4?7:0);
}
}
break;
}
CASE_fmt_W
z = (day - DATE2J(y,m,1)) % 7;
result = day - z + (z < 4?0:7);
break;
CASE_fmt_DAY
z = J2DAY(day);
if (y > 0)
result = day - z + (z < 4?0:7);
else
result = day + (5 - (z>0?(z>1?z:z+7):7));
break;
CASE_fmt_Q
result = DATE2J(y,((m-1)/3)*3+(day<(DATE2J(y,((m-1)/3)*3+2,16))?1:4),1);
break;
default:
result = day;
}
return result;
}
/* timestamp2tm()
* Convert timestamp data type to POSIX time structure.
* Note that year is _not_ 1900-based, but is an explicit full value.
* Also, month is one-based, _not_ zero-based.
* Returns:
* 0 on success
* -1 on out of range
*
* For dates within the system-supported time_t range, convert to the
* local time zone. If out of this range, leave as GMT. - tgl 97/05/27
*/
static int
timestamp2tm(timestamp dt, int *tzp, struct tm * tm, fsec_t *fsec, char **tzn)
{
#ifdef HAVE_INT64_TIMESTAMP
int64 dDate,
date0;
int64 time;
#else
double dDate,
date0;
double time;
#endif
time_t utime;
#if defined(HAVE_TM_ZONE) || defined(HAVE_INT_TIMEZONE)
struct tm *tx;
#endif
date0 = date2j(2000, 1, 1);
#ifdef HAVE_INT64_TIMESTAMP
time = dt;
TMODULO(time, dDate, USECS_PER_DAY);
if (time < INT64CONST(0))
{
time += USECS_PER_DAY;
dDate -= 1;
}
/* add offset to go from J2000 back to standard Julian date */
dDate += date0;
/* Julian day routine does not work for negative Julian days */
if (dDate < 0 || dDate > (timestamp) INT_MAX)
return -1;
j2date((int) dDate, &tm->tm_year, &tm->tm_mon, &tm->tm_mday);
dt2time(time, &tm->tm_hour, &tm->tm_min, &tm->tm_sec, fsec);
#else
time = dt;
TMODULO(time, dDate, (double) SECS_PER_DAY);
if (time < 0)
{
time += SECS_PER_DAY;
dDate -= 1;
}
/* add offset to go from J2000 back to standard Julian date */
dDate += date0;
recalc_d:
/* Julian day routine does not work for negative Julian days */
if (dDate < 0 || dDate > (timestamp) INT_MAX)
return -1;
j2date((int) dDate, &tm->tm_year, &tm->tm_mon, &tm->tm_mday);
recalc_t:
dt2time(time, &tm->tm_hour, &tm->tm_min, &tm->tm_sec, fsec);
*fsec = TSROUND(*fsec);
/* roundoff may need to propagate to higher-order fields */
if (*fsec >= 1.0)
{
time = ceil(time);
if (time >= (double) SECS_PER_DAY)
{
time = 0;
dDate += 1;
goto recalc_d;
}
goto recalc_t;
}
#endif
if (tzp != NULL)
{
/*
* Does this fall within the capabilities of the localtime()
* interface? Then use this to rotate to the local time zone.
*/
if (IS_VALID_UTIME(tm->tm_year, tm->tm_mon, tm->tm_mday))
{
#ifdef HAVE_INT64_TIMESTAMP
utime = dt / USECS_PER_SEC +
((date0 - date2j(1970, 1, 1)) * INT64CONST(86400));
#else
utime = dt + (date0 - date2j(1970, 1, 1)) * SECS_PER_DAY;
#endif
#if defined(HAVE_TM_ZONE) || defined(HAVE_INT_TIMEZONE)
tx = localtime(&utime);
tm->tm_year = tx->tm_year + 1900;
tm->tm_mon = tx->tm_mon + 1;
tm->tm_mday = tx->tm_mday;
tm->tm_hour = tx->tm_hour;
tm->tm_min = tx->tm_min;
tm->tm_isdst = tx->tm_isdst;
#if defined(HAVE_TM_ZONE)
tm->tm_gmtoff = tx->tm_gmtoff;
tm->tm_zone = tx->tm_zone;
*tzp = -tm->tm_gmtoff; /* tm_gmtoff is Sun/DEC-ism */
if (tzn != NULL)
*tzn = (char *) tm->tm_zone;
#elif defined(HAVE_INT_TIMEZONE)
*tzp = (tm->tm_isdst > 0) ? TIMEZONE_GLOBAL - SECS_PER_HOUR : TIMEZONE_GLOBAL;
if (tzn != NULL)
*tzn = TZNAME_GLOBAL[(tm->tm_isdst > 0)];
#endif
#else /* not (HAVE_TM_ZONE || HAVE_INT_TIMEZONE) */
*tzp = 0;
/* Mark this as *no* time zone available */
tm->tm_isdst = -1;
if (tzn != NULL)
*tzn = NULL;
#endif
dt = dt2local(dt, *tzp);
}
else
{
*tzp = 0;
/* Mark this as *no* time zone available */
tm->tm_isdst = -1;
if (tzn != NULL)
*tzn = NULL;
}
}
else
{
tm->tm_isdst = -1;
if (tzn != NULL)
*tzn = NULL;
}
return 0;
} /* timestamp2tm() */
