greenplumn interval 源码
greenplumn interval 代码
文件路径：/src/interfaces/ecpg/pgtypeslib/interval.c
/* src/interfaces/ecpg/pgtypeslib/interval.c */
#include "postgres_fe.h"
#include <time.h>
#include <math.h>
#include <limits.h>
#ifdef __FAST_MATH__
#error -ffast-math is known to break this code
#endif
#include "common/string.h"
#include "pgtypeslib_extern.h"
#include "dt.h"
#include "pgtypes_error.h"
#include "pgtypes_interval.h"
/* copy&pasted from .../src/backend/utils/adt/datetime.c
* and changesd struct pg_tm to struct tm
*/
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;
*fsec += rint(frac * 1000000);
}
/* copy&pasted from .../src/backend/utils/adt/datetime.c
* and changesd struct pg_tm to struct tm
*/
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);
}
/* copy&pasted from .../src/backend/utils/adt/datetime.c */
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;
}
/* copy&pasted from .../src/backend/utils/adt/datetime.c */
static int
ISO8601IntegerWidth(const char *fieldstart)
{
/* We might have had a leading '-' */
if (*fieldstart == '-')
fieldstart++;
return strspn(fieldstart, "0123456789");
}
/* copy&pasted from .../src/backend/utils/adt/datetime.c
* and changesd struct pg_tm to struct tm
*/
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;
}
/* copy&pasted from .../src/backend/utils/adt/datetime.c
*
* * changesd struct pg_tm to struct tm
*
* * Made the function static
*/
static 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;
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 += (fval * 12);
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 */
/* FALLTHROUGH */
case '-': /* ISO 8601 4.4.3.3 Alternative Format,
* Extended */
if (havefield)
return DTERR_BAD_FORMAT;
tm->tm_year += val;
tm->tm_mon += (fval * 12);
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 */
/* FALLTHROUGH */
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;
}
/* copy&pasted from .../src/backend/utils/adt/datetime.c
* with 3 exceptions
*
* * changesd struct pg_tm to struct tm
*
* * ECPG code called this without a 'range' parameter
* removed 'int range' from the argument list and
* places where DecodeTime is called; and added
* int range = INTERVAL_FULL_RANGE;
*
* * ECPG seems not to have a global IntervalStyle
* so added
* int IntervalStyle = INTSTYLE_POSTGRES;
*/
int
DecodeInterval(char **field, int *ftype, int nf, /* int range, */
int *dtype, struct /* pg_ */ tm *tm, fsec_t *fsec)
{
int IntervalStyle = INTSTYLE_POSTGRES_VERBOSE;
int range = INTERVAL_FULL_RANGE;
bool is_before = false;
char *cp;
int fmask = 0,
tmask,
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], /* range, */
&tmask, tm, fsec);
if (dterr)
return dterr;
type = DTK_DAY;
break;
case DTK_TZ:
/*
* Timezone is 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] == '+');
/*
* Try for hh:mm or hh:mm:ss. If not, fall through to
* DTK_NUMBER case, which can handle signed float numbers and
* signed year-month values.
*/
if (strchr(field[i] + 1, ':') != NULL &&
DecodeTime(field[i] + 1, /* INTERVAL_FULL_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;
tmask = DTK_M(TZ);
break;
}
/* 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):
case INTERVAL_MASK(DAY) | INTERVAL_MASK(HOUR) | INTERVAL_MASK(MINUTE):
case INTERVAL_MASK(DAY) | INTERVAL_MASK(HOUR) | INTERVAL_MASK(MINUTE) | INTERVAL_MASK(SECOND):
type = DTK_HOUR;
break;
case INTERVAL_MASK(MINUTE):
case INTERVAL_MASK(HOUR) | INTERVAL_MASK(MINUTE):
type = DTK_MINUTE;
break;
case INTERVAL_MASK(SECOND):
case INTERVAL_MASK(HOUR) | INTERVAL_MASK(MINUTE) | INTERVAL_MASK(SECOND):
case INTERVAL_MASK(MINUTE) | INTERVAL_MASK(SECOND):
type = DTK_SECOND;
break;
default:
type = DTK_SECOND;
break;
}
}
errno = 0;
val = strtoint(field[i], &cp, 10);
if (errno == ERANGE)
return DTERR_FIELD_OVERFLOW;
if (*cp == '-')
{
/* SQL "years-months" syntax */
int val2;
val2 = strtoint(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:
*fsec += rint(val + fval);
tmask = DTK_M(MICROSECOND);
break;
case DTK_MILLISEC:
*fsec += rint((val + fval) * 1000);
tmask = DTK_M(MILLISECOND);
break;
case DTK_SECOND:
tm->tm_sec += val;
*fsec += rint(fval * 1000000);
/*
* 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;
break;
case DTK_DAY:
tm->tm_mday += val;
AdjustFractSeconds(fval, tm, fsec, SECS_PER_DAY);
tmask = (fmask & DTK_M(DAY)) ? 0 : DTK_M(DAY);
break;
case DTK_WEEK:
tm->tm_mday += val * 7;
AdjustFractDays(fval, tm, fsec, 7);
tmask = (fmask & DTK_M(DAY)) ? 0 : DTK_M(DAY);
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 += fval * MONTHS_PER_YEAR;
tmask = (fmask & DTK_M(YEAR)) ? 0 : DTK_M(YEAR);
break;
case DTK_DECADE:
tm->tm_year += val * 10;
if (fval != 0)
tm->tm_mon += fval * MONTHS_PER_YEAR * 10;
tmask = (fmask & DTK_M(YEAR)) ? 0 : DTK_M(YEAR);
break;
case DTK_CENTURY:
tm->tm_year += val * 100;
if (fval != 0)
tm->tm_mon += fval * MONTHS_PER_YEAR * 100;
tmask = (fmask & DTK_M(YEAR)) ? 0 : DTK_M(YEAR);
break;
case DTK_MILLENNIUM:
tm->tm_year += val * 1000;
if (fval != 0)
tm->tm_mon += fval * MONTHS_PER_YEAR * 1000;
tmask = (fmask & DTK_M(YEAR)) ? 0 : DTK_M(YEAR);
break;
default:
return DTERR_BAD_FORMAT;
}
break;
case DTK_STRING:
case DTK_SPECIAL:
type = DecodeUnits(i, field[i], &val);
if (type == IGNORE_DTF)
continue;
tmask = 0; /* DTK_M(type); */
switch (type)
{
case UNITS:
type = val;
break;
case AGO:
is_before = true;
type = val;
break;
case RESERV:
tmask = (DTK_DATE_M | DTK_TIME_M);
*dtype = val;
break;
default:
return DTERR_BAD_FORMAT;
}
break;
default:
return DTERR_BAD_FORMAT;
}
if (tmask & fmask)
return DTERR_BAD_FORMAT;
fmask |= tmask;
}
/* 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;
sec = *fsec / USECS_PER_SEC;
*fsec -= sec * USECS_PER_SEC;
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 Postgres
* 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 postgres-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 postgres style, not SQL style.)
*----------
*/
if (IntervalStyle == INTSTYLE_SQL_STANDARD && *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;
}
/* copy&pasted from .../src/backend/utils/adt/datetime.c */
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;
sprintf(cp, " %d %s%s", value, units, (value == 1) ? "" : "s");
*is_zero = false;
return cp + strlen(cp);
}
/* copy&pasted from .../src/backend/utils/adt/datetime.c */
static char *
AddPostgresIntPart(char *cp, int value, const char *units,
bool *is_zero, bool *is_before)
{
if (value == 0)
return cp;
sprintf(cp, "%s%s%d %s%s",
(!*is_zero) ? " " : "",
(*is_before && value > 0) ? "+" : "",
value,
units,
(value != 1) ? "s" : "");
/*
* 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);
}
/* copy&pasted from .../src/backend/utils/adt/datetime.c */
static char *
AddISO8601IntPart(char *cp, int value, char units)
{
if (value == 0)
return cp;
sprintf(cp, "%d%c", value, units);
return cp + strlen(cp);
}
/* copy&pasted from .../src/backend/utils/adt/datetime.c */
static void
AppendSeconds(char *cp, int sec, fsec_t fsec, int precision, bool fillzeros)
{
if (fsec == 0)
{
if (fillzeros)
sprintf(cp, "%02d", abs(sec));
else
sprintf(cp, "%d", abs(sec));
}
else
{
if (fillzeros)
sprintf(cp, "%02d.%0*d", abs(sec), precision, (int) Abs(fsec));
else
sprintf(cp, "%d.%0*d", abs(sec), precision, (int) Abs(fsec));
TrimTrailingZeros(cp);
}
}
/* copy&pasted from .../src/backend/utils/adt/datetime.c
*
* Change pg_tm to tm
*/
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;
bool is_before = false;
bool is_zero = true;
/*
* 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)
{
/* 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;
}
if (!has_negative && !has_positive)
{
sprintf(cp, "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) ? '-' : '+';
sprintf(cp, "%c%d-%d %c%d %c%d:%02d:",
year_sign, abs(year), abs(mon),
day_sign, abs(mday),
sec_sign, abs(hour), abs(min));
cp += strlen(cp);
AppendSeconds(cp, sec, fsec, MAX_INTERVAL_PRECISION, true);
}
else if (has_year_month)
{
sprintf(cp, "%d-%d", year, mon);
}
else if (has_day)
{
sprintf(cp, "%d %d:%02d:", mday, hour, min);
cp += strlen(cp);
AppendSeconds(cp, sec, fsec, MAX_INTERVAL_PRECISION, true);
}
else
{
sprintf(cp, "%d:%02d:", hour, min);
cp += strlen(cp);
AppendSeconds(cp, sec, fsec, MAX_INTERVAL_PRECISION, true);
}
}
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)
{
sprintf(cp, "PT0S");
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++ = '-';
AppendSeconds(cp, sec, fsec, MAX_INTERVAL_PRECISION, false);
cp += strlen(cp);
*cp++ = 'S';
*cp = '\0';
}
break;
/* Compatible with postgresql < 8.4 when DateStyle = 'iso' */
case INTSTYLE_POSTGRES:
cp = AddPostgresIntPart(cp, year, "year", &is_zero, &is_before);
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);
sprintf(cp, "%s%s%02d:%02d:",
is_zero ? "" : " ",
(minus ? "-" : (is_before ? "+" : "")),
abs(hour), abs(min));
cp += strlen(cp);
AppendSeconds(cp, sec, fsec, MAX_INTERVAL_PRECISION, true);
}
break;
/* Compatible with postgresql < 8.4 when DateStyle != 'iso' */
case INTSTYLE_POSTGRES_VERBOSE:
default:
strcpy(cp, "@");
cp++;
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++ = ' ';
if (sec < 0 || (sec == 0 && fsec < 0))
{
if (is_zero)
is_before = true;
else if (!is_before)
*cp++ = '-';
}
else if (is_before)
*cp++ = '-';
AppendSeconds(cp, sec, fsec, MAX_INTERVAL_PRECISION, false);
cp += strlen(cp);
sprintf(cp, " sec%s",
(abs(sec) != 1 || fsec != 0) ? "s" : "");
is_zero = false;
}
/* identically zero? then put in a unitless zero... */
if (is_zero)
strcat(cp, " 0");
if (is_before)
strcat(cp, " ago");
break;
}
}
/* interval2tm()
* Convert an interval data type to a tm structure.
*/
static int
interval2tm(interval span, struct tm *tm, fsec_t *fsec)
{
int64 time;
if (span.month != 0)
{
tm->tm_year = span.month / MONTHS_PER_YEAR;
tm->tm_mon = span.month % MONTHS_PER_YEAR;
}
else
{
tm->tm_year = 0;
tm->tm_mon = 0;
}
time = span.time;
tm->tm_mday = time / USECS_PER_DAY;
time -= tm->tm_mday * USECS_PER_DAY;
tm->tm_hour = time / USECS_PER_HOUR;
time -= tm->tm_hour * USECS_PER_HOUR;
tm->tm_min = time / USECS_PER_MINUTE;
time -= tm->tm_min * USECS_PER_MINUTE;
tm->tm_sec = time / USECS_PER_SEC;
*fsec = time - (tm->tm_sec * USECS_PER_SEC);
return 0;
} /* interval2tm() */
static int
tm2interval(struct tm *tm, fsec_t fsec, interval * span)
{
if ((double) tm->tm_year * MONTHS_PER_YEAR + tm->tm_mon > INT_MAX ||
(double) tm->tm_year * MONTHS_PER_YEAR + tm->tm_mon < INT_MIN)
return -1;
span->month = tm->tm_year * MONTHS_PER_YEAR + tm->tm_mon;
span->time = (((((((tm->tm_mday * INT64CONST(24)) +
tm->tm_hour) * INT64CONST(60)) +
tm->tm_min) * INT64CONST(60)) +
tm->tm_sec) * USECS_PER_SEC) + fsec;
return 0;
} /* tm2interval() */
interval *
PGTYPESinterval_new(void)
{
interval *result;
result = (interval *) pgtypes_alloc(sizeof(interval));
/* result can be NULL if we run out of memory */
return result;
}
void
PGTYPESinterval_free(interval * intvl)
{
free(intvl);
}
interval *
PGTYPESinterval_from_asc(char *str, char **endptr)
{
interval *result = NULL;
fsec_t fsec;
struct tm tt,
*tm = &tt;
int dtype;
int nf;
char *field[MAXDATEFIELDS];
int ftype[MAXDATEFIELDS];
char lowstr[MAXDATELEN + MAXDATEFIELDS];
char *realptr;
char **ptr = (endptr != NULL) ? endptr : &realptr;
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;
if (strlen(str) > MAXDATELEN)
{
errno = PGTYPES_INTVL_BAD_INTERVAL;
return NULL;
}
if (ParseDateTime(str, lowstr, field, ftype, &nf, ptr) != 0 ||
(DecodeInterval(field, ftype, nf, &dtype, tm, &fsec) != 0 &&
DecodeISO8601Interval(str, &dtype, tm, &fsec) != 0))
{
errno = PGTYPES_INTVL_BAD_INTERVAL;
return NULL;
}
result = (interval *) pgtypes_alloc(sizeof(interval));
if (!result)
return NULL;
if (dtype != DTK_DELTA)
{
errno = PGTYPES_INTVL_BAD_INTERVAL;
free(result);
return NULL;
}
if (tm2interval(tm, fsec, result) != 0)
{
errno = PGTYPES_INTVL_BAD_INTERVAL;
free(result);
return NULL;
}
errno = 0;
return result;
}
char *
PGTYPESinterval_to_asc(interval * span)
{
struct tm tt,
*tm = &tt;
fsec_t fsec;
char buf[MAXDATELEN + 1];
int IntervalStyle = INTSTYLE_POSTGRES_VERBOSE;
if (interval2tm(*span, tm, &fsec) != 0)
{
errno = PGTYPES_INTVL_BAD_INTERVAL;
return NULL;
}
EncodeInterval(tm, fsec, IntervalStyle, buf);
return pgtypes_strdup(buf);
}
int
PGTYPESinterval_copy(interval * intvlsrc, interval * intvldest)
{
intvldest->time = intvlsrc->time;
intvldest->month = intvlsrc->month;
return 0;
}
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