diff options
Diffstat (limited to 'Modules/_datetimemodule.c')
| -rw-r--r-- | Modules/_datetimemodule.c | 5488 |
1 files changed, 5488 insertions, 0 deletions
diff --git a/Modules/_datetimemodule.c b/Modules/_datetimemodule.c new file mode 100644 index 0000000..b2505d1 --- /dev/null +++ b/Modules/_datetimemodule.c @@ -0,0 +1,5488 @@ +/* C implementation for the date/time type documented at + * http://www.zope.org/Members/fdrake/DateTimeWiki/FrontPage + */ + +#include "Python.h" +#include "modsupport.h" +#include "structmember.h" + +#include <time.h> + +#include "timefuncs.h" + +/* Differentiate between building the core module and building extension + * modules. + */ +#ifndef Py_BUILD_CORE +#define Py_BUILD_CORE +#endif +#include "datetime.h" +#undef Py_BUILD_CORE + +/* We require that C int be at least 32 bits, and use int virtually + * everywhere. In just a few cases we use a temp long, where a Python + * API returns a C long. In such cases, we have to ensure that the + * final result fits in a C int (this can be an issue on 64-bit boxes). + */ +#if SIZEOF_INT < 4 +# error "_datetime.c requires that C int have at least 32 bits" +#endif + +#define MINYEAR 1 +#define MAXYEAR 9999 +#define MAXORDINAL 3652059 /* date(9999,12,31).toordinal() */ + +/* Nine decimal digits is easy to communicate, and leaves enough room + * so that two delta days can be added w/o fear of overflowing a signed + * 32-bit int, and with plenty of room left over to absorb any possible + * carries from adding seconds. + */ +#define MAX_DELTA_DAYS 999999999 + +/* Rename the long macros in datetime.h to more reasonable short names. */ +#define GET_YEAR PyDateTime_GET_YEAR +#define GET_MONTH PyDateTime_GET_MONTH +#define GET_DAY PyDateTime_GET_DAY +#define DATE_GET_HOUR PyDateTime_DATE_GET_HOUR +#define DATE_GET_MINUTE PyDateTime_DATE_GET_MINUTE +#define DATE_GET_SECOND PyDateTime_DATE_GET_SECOND +#define DATE_GET_MICROSECOND PyDateTime_DATE_GET_MICROSECOND + +/* Date accessors for date and datetime. */ +#define SET_YEAR(o, v) (((o)->data[0] = ((v) & 0xff00) >> 8), \ + ((o)->data[1] = ((v) & 0x00ff))) +#define SET_MONTH(o, v) (PyDateTime_GET_MONTH(o) = (v)) +#define SET_DAY(o, v) (PyDateTime_GET_DAY(o) = (v)) + +/* Date/Time accessors for datetime. */ +#define DATE_SET_HOUR(o, v) (PyDateTime_DATE_GET_HOUR(o) = (v)) +#define DATE_SET_MINUTE(o, v) (PyDateTime_DATE_GET_MINUTE(o) = (v)) +#define DATE_SET_SECOND(o, v) (PyDateTime_DATE_GET_SECOND(o) = (v)) +#define DATE_SET_MICROSECOND(o, v) \ + (((o)->data[7] = ((v) & 0xff0000) >> 16), \ + ((o)->data[8] = ((v) & 0x00ff00) >> 8), \ + ((o)->data[9] = ((v) & 0x0000ff))) + +/* Time accessors for time. */ +#define TIME_GET_HOUR PyDateTime_TIME_GET_HOUR +#define TIME_GET_MINUTE PyDateTime_TIME_GET_MINUTE +#define TIME_GET_SECOND PyDateTime_TIME_GET_SECOND +#define TIME_GET_MICROSECOND PyDateTime_TIME_GET_MICROSECOND +#define TIME_SET_HOUR(o, v) (PyDateTime_TIME_GET_HOUR(o) = (v)) +#define TIME_SET_MINUTE(o, v) (PyDateTime_TIME_GET_MINUTE(o) = (v)) +#define TIME_SET_SECOND(o, v) (PyDateTime_TIME_GET_SECOND(o) = (v)) +#define TIME_SET_MICROSECOND(o, v) \ + (((o)->data[3] = ((v) & 0xff0000) >> 16), \ + ((o)->data[4] = ((v) & 0x00ff00) >> 8), \ + ((o)->data[5] = ((v) & 0x0000ff))) + +/* Delta accessors for timedelta. */ +#define GET_TD_DAYS(o) (((PyDateTime_Delta *)(o))->days) +#define GET_TD_SECONDS(o) (((PyDateTime_Delta *)(o))->seconds) +#define GET_TD_MICROSECONDS(o) (((PyDateTime_Delta *)(o))->microseconds) + +#define SET_TD_DAYS(o, v) ((o)->days = (v)) +#define SET_TD_SECONDS(o, v) ((o)->seconds = (v)) +#define SET_TD_MICROSECONDS(o, v) ((o)->microseconds = (v)) + +/* p is a pointer to a time or a datetime object; HASTZINFO(p) returns + * p->hastzinfo. + */ +#define HASTZINFO(p) (((_PyDateTime_BaseTZInfo *)(p))->hastzinfo) +#define GET_TIME_TZINFO(p) (HASTZINFO(p) ? \ + ((PyDateTime_Time *)(p))->tzinfo : Py_None) +#define GET_DT_TZINFO(p) (HASTZINFO(p) ? \ + ((PyDateTime_DateTime *)(p))->tzinfo : Py_None) +/* M is a char or int claiming to be a valid month. The macro is equivalent + * to the two-sided Python test + * 1 <= M <= 12 + */ +#define MONTH_IS_SANE(M) ((unsigned int)(M) - 1 < 12) + +/* Forward declarations. */ +static PyTypeObject PyDateTime_DateType; +static PyTypeObject PyDateTime_DateTimeType; +static PyTypeObject PyDateTime_DeltaType; +static PyTypeObject PyDateTime_TimeType; +static PyTypeObject PyDateTime_TZInfoType; +static PyTypeObject PyDateTime_TimeZoneType; + +/* --------------------------------------------------------------------------- + * Math utilities. + */ + +/* k = i+j overflows iff k differs in sign from both inputs, + * iff k^i has sign bit set and k^j has sign bit set, + * iff (k^i)&(k^j) has sign bit set. + */ +#define SIGNED_ADD_OVERFLOWED(RESULT, I, J) \ + ((((RESULT) ^ (I)) & ((RESULT) ^ (J))) < 0) + +/* Compute Python divmod(x, y), returning the quotient and storing the + * remainder into *r. The quotient is the floor of x/y, and that's + * the real point of this. C will probably truncate instead (C99 + * requires truncation; C89 left it implementation-defined). + * Simplification: we *require* that y > 0 here. That's appropriate + * for all the uses made of it. This simplifies the code and makes + * the overflow case impossible (divmod(LONG_MIN, -1) is the only + * overflow case). + */ +static int +divmod(int x, int y, int *r) +{ + int quo; + + assert(y > 0); + quo = x / y; + *r = x - quo * y; + if (*r < 0) { + --quo; + *r += y; + } + assert(0 <= *r && *r < y); + return quo; +} + +/* Round a double to the nearest long. |x| must be small enough to fit + * in a C long; this is not checked. + */ +static long +round_to_long(double x) +{ + if (x >= 0.0) + x = floor(x + 0.5); + else + x = ceil(x - 0.5); + return (long)x; +} + +/* Nearest integer to m / n for integers m and n. Half-integer results + * are rounded to even. + */ +static PyObject * +divide_nearest(PyObject *m, PyObject *n) +{ + PyObject *result; + PyObject *temp; + + temp = _PyLong_DivmodNear(m, n); + if (temp == NULL) + return NULL; + result = PyTuple_GET_ITEM(temp, 0); + Py_INCREF(result); + Py_DECREF(temp); + + return result; +} + +/* --------------------------------------------------------------------------- + * General calendrical helper functions + */ + +/* For each month ordinal in 1..12, the number of days in that month, + * and the number of days before that month in the same year. These + * are correct for non-leap years only. + */ +static int _days_in_month[] = { + 0, /* unused; this vector uses 1-based indexing */ + 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 +}; + +static int _days_before_month[] = { + 0, /* unused; this vector uses 1-based indexing */ + 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 +}; + +/* year -> 1 if leap year, else 0. */ +static int +is_leap(int year) +{ + /* Cast year to unsigned. The result is the same either way, but + * C can generate faster code for unsigned mod than for signed + * mod (especially for % 4 -- a good compiler should just grab + * the last 2 bits when the LHS is unsigned). + */ + const unsigned int ayear = (unsigned int)year; + return ayear % 4 == 0 && (ayear % 100 != 0 || ayear % 400 == 0); +} + +/* year, month -> number of days in that month in that year */ +static int +days_in_month(int year, int month) +{ + assert(month >= 1); + assert(month <= 12); + if (month == 2 && is_leap(year)) + return 29; + else + return _days_in_month[month]; +} + +/* year, month -> number of days in year preceeding first day of month */ +static int +days_before_month(int year, int month) +{ + int days; + + assert(month >= 1); + assert(month <= 12); + days = _days_before_month[month]; + if (month > 2 && is_leap(year)) + ++days; + return days; +} + +/* year -> number of days before January 1st of year. Remember that we + * start with year 1, so days_before_year(1) == 0. + */ +static int +days_before_year(int year) +{ + int y = year - 1; + /* This is incorrect if year <= 0; we really want the floor + * here. But so long as MINYEAR is 1, the smallest year this + * can see is 0 (this can happen in some normalization endcases), + * so we'll just special-case that. + */ + assert (year >= 0); + if (y >= 0) + return y*365 + y/4 - y/100 + y/400; + else { + assert(y == -1); + return -366; + } +} + +/* Number of days in 4, 100, and 400 year cycles. That these have + * the correct values is asserted in the module init function. + */ +#define DI4Y 1461 /* days_before_year(5); days in 4 years */ +#define DI100Y 36524 /* days_before_year(101); days in 100 years */ +#define DI400Y 146097 /* days_before_year(401); days in 400 years */ + +/* ordinal -> year, month, day, considering 01-Jan-0001 as day 1. */ +static void +ord_to_ymd(int ordinal, int *year, int *month, int *day) +{ + int n, n1, n4, n100, n400, leapyear, preceding; + + /* ordinal is a 1-based index, starting at 1-Jan-1. The pattern of + * leap years repeats exactly every 400 years. The basic strategy is + * to find the closest 400-year boundary at or before ordinal, then + * work with the offset from that boundary to ordinal. Life is much + * clearer if we subtract 1 from ordinal first -- then the values + * of ordinal at 400-year boundaries are exactly those divisible + * by DI400Y: + * + * D M Y n n-1 + * -- --- ---- ---------- ---------------- + * 31 Dec -400 -DI400Y -DI400Y -1 + * 1 Jan -399 -DI400Y +1 -DI400Y 400-year boundary + * ... + * 30 Dec 000 -1 -2 + * 31 Dec 000 0 -1 + * 1 Jan 001 1 0 400-year boundary + * 2 Jan 001 2 1 + * 3 Jan 001 3 2 + * ... + * 31 Dec 400 DI400Y DI400Y -1 + * 1 Jan 401 DI400Y +1 DI400Y 400-year boundary + */ + assert(ordinal >= 1); + --ordinal; + n400 = ordinal / DI400Y; + n = ordinal % DI400Y; + *year = n400 * 400 + 1; + + /* Now n is the (non-negative) offset, in days, from January 1 of + * year, to the desired date. Now compute how many 100-year cycles + * precede n. + * Note that it's possible for n100 to equal 4! In that case 4 full + * 100-year cycles precede the desired day, which implies the + * desired day is December 31 at the end of a 400-year cycle. + */ + n100 = n / DI100Y; + n = n % DI100Y; + + /* Now compute how many 4-year cycles precede it. */ + n4 = n / DI4Y; + n = n % DI4Y; + + /* And now how many single years. Again n1 can be 4, and again + * meaning that the desired day is December 31 at the end of the + * 4-year cycle. + */ + n1 = n / 365; + n = n % 365; + + *year += n100 * 100 + n4 * 4 + n1; + if (n1 == 4 || n100 == 4) { + assert(n == 0); + *year -= 1; + *month = 12; + *day = 31; + return; + } + + /* Now the year is correct, and n is the offset from January 1. We + * find the month via an estimate that's either exact or one too + * large. + */ + leapyear = n1 == 3 && (n4 != 24 || n100 == 3); + assert(leapyear == is_leap(*year)); + *month = (n + 50) >> 5; + preceding = (_days_before_month[*month] + (*month > 2 && leapyear)); + if (preceding > n) { + /* estimate is too large */ + *month -= 1; + preceding -= days_in_month(*year, *month); + } + n -= preceding; + assert(0 <= n); + assert(n < days_in_month(*year, *month)); + + *day = n + 1; +} + +/* year, month, day -> ordinal, considering 01-Jan-0001 as day 1. */ +static int +ymd_to_ord(int year, int month, int day) +{ + return days_before_year(year) + days_before_month(year, month) + day; +} + +/* Day of week, where Monday==0, ..., Sunday==6. 1/1/1 was a Monday. */ +static int +weekday(int year, int month, int day) +{ + return (ymd_to_ord(year, month, day) + 6) % 7; +} + +/* Ordinal of the Monday starting week 1 of the ISO year. Week 1 is the + * first calendar week containing a Thursday. + */ +static int +iso_week1_monday(int year) +{ + int first_day = ymd_to_ord(year, 1, 1); /* ord of 1/1 */ + /* 0 if 1/1 is a Monday, 1 if a Tue, etc. */ + int first_weekday = (first_day + 6) % 7; + /* ordinal of closest Monday at or before 1/1 */ + int week1_monday = first_day - first_weekday; + + if (first_weekday > 3) /* if 1/1 was Fri, Sat, Sun */ + week1_monday += 7; + return week1_monday; +} + +/* --------------------------------------------------------------------------- + * Range checkers. + */ + +/* Check that -MAX_DELTA_DAYS <= days <= MAX_DELTA_DAYS. If so, return 0. + * If not, raise OverflowError and return -1. + */ +static int +check_delta_day_range(int days) +{ + if (-MAX_DELTA_DAYS <= days && days <= MAX_DELTA_DAYS) + return 0; + PyErr_Format(PyExc_OverflowError, + "days=%d; must have magnitude <= %d", + days, MAX_DELTA_DAYS); + return -1; +} + +/* Check that date arguments are in range. Return 0 if they are. If they + * aren't, raise ValueError and return -1. + */ +static int +check_date_args(int year, int month, int day) +{ + + if (year < MINYEAR || year > MAXYEAR) { + PyErr_SetString(PyExc_ValueError, + "year is out of range"); + return -1; + } + if (month < 1 || month > 12) { + PyErr_SetString(PyExc_ValueError, + "month must be in 1..12"); + return -1; + } + if (day < 1 || day > days_in_month(year, month)) { + PyErr_SetString(PyExc_ValueError, + "day is out of range for month"); + return -1; + } + return 0; +} + +/* Check that time arguments are in range. Return 0 if they are. If they + * aren't, raise ValueError and return -1. + */ +static int +check_time_args(int h, int m, int s, int us) +{ + if (h < 0 || h > 23) { + PyErr_SetString(PyExc_ValueError, + "hour must be in 0..23"); + return -1; + } + if (m < 0 || m > 59) { + PyErr_SetString(PyExc_ValueError, + "minute must be in 0..59"); + return -1; + } + if (s < 0 || s > 59) { + PyErr_SetString(PyExc_ValueError, + "second must be in 0..59"); + return -1; + } + if (us < 0 || us > 999999) { + PyErr_SetString(PyExc_ValueError, + "microsecond must be in 0..999999"); + return -1; + } + return 0; +} + +/* --------------------------------------------------------------------------- + * Normalization utilities. + */ + +/* One step of a mixed-radix conversion. A "hi" unit is equivalent to + * factor "lo" units. factor must be > 0. If *lo is less than 0, or + * at least factor, enough of *lo is converted into "hi" units so that + * 0 <= *lo < factor. The input values must be such that int overflow + * is impossible. + */ +static void +normalize_pair(int *hi, int *lo, int factor) +{ + assert(factor > 0); + assert(lo != hi); + if (*lo < 0 || *lo >= factor) { + const int num_hi = divmod(*lo, factor, lo); + const int new_hi = *hi + num_hi; + assert(! SIGNED_ADD_OVERFLOWED(new_hi, *hi, num_hi)); + *hi = new_hi; + } + assert(0 <= *lo && *lo < factor); +} + +/* Fiddle days (d), seconds (s), and microseconds (us) so that + * 0 <= *s < 24*3600 + * 0 <= *us < 1000000 + * The input values must be such that the internals don't overflow. + * The way this routine is used, we don't get close. + */ +static void +normalize_d_s_us(int *d, int *s, int *us) +{ + if (*us < 0 || *us >= 1000000) { + normalize_pair(s, us, 1000000); + /* |s| can't be bigger than about + * |original s| + |original us|/1000000 now. + */ + + } + if (*s < 0 || *s >= 24*3600) { + normalize_pair(d, s, 24*3600); + /* |d| can't be bigger than about + * |original d| + + * (|original s| + |original us|/1000000) / (24*3600) now. + */ + } + assert(0 <= *s && *s < 24*3600); + assert(0 <= *us && *us < 1000000); +} + +/* Fiddle years (y), months (m), and days (d) so that + * 1 <= *m <= 12 + * 1 <= *d <= days_in_month(*y, *m) + * The input values must be such that the internals don't overflow. + * The way this routine is used, we don't get close. + */ +static int +normalize_y_m_d(int *y, int *m, int *d) +{ + int dim; /* # of days in month */ + + /* This gets muddy: the proper range for day can't be determined + * without knowing the correct month and year, but if day is, e.g., + * plus or minus a million, the current month and year values make + * no sense (and may also be out of bounds themselves). + * Saying 12 months == 1 year should be non-controversial. + */ + if (*m < 1 || *m > 12) { + --*m; + normalize_pair(y, m, 12); + ++*m; + /* |y| can't be bigger than about + * |original y| + |original m|/12 now. + */ + } + assert(1 <= *m && *m <= 12); + + /* Now only day can be out of bounds (year may also be out of bounds + * for a datetime object, but we don't care about that here). + * If day is out of bounds, what to do is arguable, but at least the + * method here is principled and explainable. + */ + dim = days_in_month(*y, *m); + if (*d < 1 || *d > dim) { + /* Move day-1 days from the first of the month. First try to + * get off cheap if we're only one day out of range + * (adjustments for timezone alone can't be worse than that). + */ + if (*d == 0) { + --*m; + if (*m > 0) + *d = days_in_month(*y, *m); + else { + --*y; + *m = 12; + *d = 31; + } + } + else if (*d == dim + 1) { + /* move forward a day */ + ++*m; + *d = 1; + if (*m > 12) { + *m = 1; + ++*y; + } + } + else { + int ordinal = ymd_to_ord(*y, *m, 1) + + *d - 1; + if (ordinal < 1 || ordinal > MAXORDINAL) { + goto error; + } else { + ord_to_ymd(ordinal, y, m, d); + return 0; + } + } + } + assert(*m > 0); + assert(*d > 0); + if (MINYEAR <= *y && *y <= MAXYEAR) + return 0; + error: + PyErr_SetString(PyExc_OverflowError, + "date value out of range"); + return -1; + +} + +/* Fiddle out-of-bounds months and days so that the result makes some kind + * of sense. The parameters are both inputs and outputs. Returns < 0 on + * failure, where failure means the adjusted year is out of bounds. + */ +static int +normalize_date(int *year, int *month, int *day) +{ + return normalize_y_m_d(year, month, day); +} + +/* Force all the datetime fields into range. The parameters are both + * inputs and outputs. Returns < 0 on error. + */ +static int +normalize_datetime(int *year, int *month, int *day, + int *hour, int *minute, int *second, + int *microsecond) +{ + normalize_pair(second, microsecond, 1000000); + normalize_pair(minute, second, 60); + normalize_pair(hour, minute, 60); + normalize_pair(day, hour, 24); + return normalize_date(year, month, day); +} + +/* --------------------------------------------------------------------------- + * Basic object allocation: tp_alloc implementations. These allocate + * Python objects of the right size and type, and do the Python object- + * initialization bit. If there's not enough memory, they return NULL after + * setting MemoryError. All data members remain uninitialized trash. + * + * We abuse the tp_alloc "nitems" argument to communicate whether a tzinfo + * member is needed. This is ugly, imprecise, and possibly insecure. + * tp_basicsize for the time and datetime types is set to the size of the + * struct that has room for the tzinfo member, so subclasses in Python will + * allocate enough space for a tzinfo member whether or not one is actually + * needed. That's the "ugly and imprecise" parts. The "possibly insecure" + * part is that PyType_GenericAlloc() (which subclasses in Python end up + * using) just happens today to effectively ignore the nitems argument + * when tp_itemsize is 0, which it is for these type objects. If that + * changes, perhaps the callers of tp_alloc slots in this file should + * be changed to force a 0 nitems argument unless the type being allocated + * is a base type implemented in this file (so that tp_alloc is time_alloc + * or datetime_alloc below, which know about the nitems abuse). + */ + +static PyObject * +time_alloc(PyTypeObject *type, Py_ssize_t aware) +{ + PyObject *self; + + self = (PyObject *) + PyObject_MALLOC(aware ? + sizeof(PyDateTime_Time) : + sizeof(_PyDateTime_BaseTime)); + if (self == NULL) + return (PyObject *)PyErr_NoMemory(); + PyObject_INIT(self, type); + return self; +} + +static PyObject * +datetime_alloc(PyTypeObject *type, Py_ssize_t aware) +{ + PyObject *self; + + self = (PyObject *) + PyObject_MALLOC(aware ? + sizeof(PyDateTime_DateTime) : + sizeof(_PyDateTime_BaseDateTime)); + if (self == NULL) + return (PyObject *)PyErr_NoMemory(); + PyObject_INIT(self, type); + return self; +} + +/* --------------------------------------------------------------------------- + * Helpers for setting object fields. These work on pointers to the + * appropriate base class. + */ + +/* For date and datetime. */ +static void +set_date_fields(PyDateTime_Date *self, int y, int m, int d) +{ + self->hashcode = -1; + SET_YEAR(self, y); + SET_MONTH(self, m); + SET_DAY(self, d); +} + +/* --------------------------------------------------------------------------- + * Create various objects, mostly without range checking. + */ + +/* Create a date instance with no range checking. */ +static PyObject * +new_date_ex(int year, int month, int day, PyTypeObject *type) +{ + PyDateTime_Date *self; + + self = (PyDateTime_Date *) (type->tp_alloc(type, 0)); + if (self != NULL) + set_date_fields(self, year, month, day); + return (PyObject *) self; +} + +#define new_date(year, month, day) \ + new_date_ex(year, month, day, &PyDateTime_DateType) + +/* Create a datetime instance with no range checking. */ +static PyObject * +new_datetime_ex(int year, int month, int day, int hour, int minute, + int second, int usecond, PyObject *tzinfo, PyTypeObject *type) +{ + PyDateTime_DateTime *self; + char aware = tzinfo != Py_None; + + self = (PyDateTime_DateTime *) (type->tp_alloc(type, aware)); + if (self != NULL) { + self->hastzinfo = aware; + set_date_fields((PyDateTime_Date *)self, year, month, day); + DATE_SET_HOUR(self, hour); + DATE_SET_MINUTE(self, minute); + DATE_SET_SECOND(self, second); + DATE_SET_MICROSECOND(self, usecond); + if (aware) { + Py_INCREF(tzinfo); + self->tzinfo = tzinfo; + } + } + return (PyObject *)self; +} + +#define new_datetime(y, m, d, hh, mm, ss, us, tzinfo) \ + new_datetime_ex(y, m, d, hh, mm, ss, us, tzinfo, \ + &PyDateTime_DateTimeType) + +/* Create a time instance with no range checking. */ +static PyObject * +new_time_ex(int hour, int minute, int second, int usecond, + PyObject *tzinfo, PyTypeObject *type) +{ + PyDateTime_Time *self; + char aware = tzinfo != Py_None; + + self = (PyDateTime_Time *) (type->tp_alloc(type, aware)); + if (self != NULL) { + self->hastzinfo = aware; + self->hashcode = -1; + TIME_SET_HOUR(self, hour); + TIME_SET_MINUTE(self, minute); + TIME_SET_SECOND(self, second); + TIME_SET_MICROSECOND(self, usecond); + if (aware) { + Py_INCREF(tzinfo); + self->tzinfo = tzinfo; + } + } + return (PyObject *)self; +} + +#define new_time(hh, mm, ss, us, tzinfo) \ + new_time_ex(hh, mm, ss, us, tzinfo, &PyDateTime_TimeType) + +/* Create a timedelta instance. Normalize the members iff normalize is + * true. Passing false is a speed optimization, if you know for sure + * that seconds and microseconds are already in their proper ranges. In any + * case, raises OverflowError and returns NULL if the normalized days is out + * of range). + */ +static PyObject * +new_delta_ex(int days, int seconds, int microseconds, int normalize, + PyTypeObject *type) +{ + PyDateTime_Delta *self; + + if (normalize) + normalize_d_s_us(&days, &seconds, µseconds); + assert(0 <= seconds && seconds < 24*3600); + assert(0 <= microseconds && microseconds < 1000000); + + if (check_delta_day_range(days) < 0) + return NULL; + + self = (PyDateTime_Delta *) (type->tp_alloc(type, 0)); + if (self != NULL) { + self->hashcode = -1; + SET_TD_DAYS(self, days); + SET_TD_SECONDS(self, seconds); + SET_TD_MICROSECONDS(self, microseconds); + } + return (PyObject *) self; +} + +#define new_delta(d, s, us, normalize) \ + new_delta_ex(d, s, us, normalize, &PyDateTime_DeltaType) + + +typedef struct +{ + PyObject_HEAD + PyObject *offset; + PyObject *name; +} PyDateTime_TimeZone; + +PyObject *PyDateTime_TimeZone_UTC; + +/* Create new timezone instance checking offset range. This + function does not check the name argument. Caller must assure + that offset is a timedelta instance and name is either NULL + or a unicode object. */ +static PyObject * +new_timezone(PyObject *offset, PyObject *name) +{ + PyDateTime_TimeZone *self; + PyTypeObject *type = &PyDateTime_TimeZoneType; + + assert(offset != NULL); + assert(PyDelta_Check(offset)); + assert(name == NULL || PyUnicode_Check(name)); + + if (GET_TD_MICROSECONDS(offset) != 0 || GET_TD_SECONDS(offset) % 60 != 0) { + PyErr_Format(PyExc_ValueError, "offset must be a timedelta" + " representing a whole number of minutes"); + return NULL; + } + if ((GET_TD_DAYS(offset) == -1 && GET_TD_SECONDS(offset) == 0) || + GET_TD_DAYS(offset) < -1 || GET_TD_DAYS(offset) >= 1) { + PyErr_Format(PyExc_ValueError, "offset must be a timedelta" + " strictly between -timedelta(hours=24) and" + " timedelta(hours=24)."); + return NULL; + } + + self = (PyDateTime_TimeZone *)(type->tp_alloc(type, 0)); + if (self == NULL) { + return NULL; + } + Py_INCREF(offset); + self->offset = offset; + Py_XINCREF(name); + self->name = name; + return (PyObject *)self; +} + +/* --------------------------------------------------------------------------- + * tzinfo helpers. + */ + +/* Ensure that p is None or of a tzinfo subclass. Return 0 if OK; if not + * raise TypeError and return -1. + */ +static int +check_tzinfo_subclass(PyObject *p) +{ + if (p == Py_None || PyTZInfo_Check(p)) + return 0; + PyErr_Format(PyExc_TypeError, + "tzinfo argument must be None or of a tzinfo subclass, " + "not type '%s'", + Py_TYPE(p)->tp_name); + return -1; +} + +/* If self has a tzinfo member, return a BORROWED reference to it. Else + * return NULL, which is NOT AN ERROR. There are no error returns here, + * and the caller must not decref the result. + */ +static PyObject * +get_tzinfo_member(PyObject *self) +{ + PyObject *tzinfo = NULL; + + if (PyDateTime_Check(self) && HASTZINFO(self)) + tzinfo = ((PyDateTime_DateTime *)self)->tzinfo; + else if (PyTime_Check(self) && HASTZINFO(self)) + tzinfo = ((PyDateTime_Time *)self)->tzinfo; + + return tzinfo; +} + +/* Call getattr(tzinfo, name)(tzinfoarg), and check the result. tzinfo must + * be an instance of the tzinfo class. If the method returns None, this + * returns None. If the method doesn't return None or timedelta, TypeError is + * raised and this returns NULL. If it returns a timedelta and the value is + * out of range or isn't a whole number of minutes, ValueError is raised and + * this returns NULL. Else result is returned. + */ +static PyObject * +call_tzinfo_method(PyObject *tzinfo, char *name, PyObject *tzinfoarg) +{ + PyObject *offset; + + assert(tzinfo != NULL); + assert(PyTZInfo_Check(tzinfo) || tzinfo == Py_None); + assert(tzinfoarg != NULL); + + if (tzinfo == Py_None) + Py_RETURN_NONE; + offset = PyObject_CallMethod(tzinfo, name, "O", tzinfoarg); + if (offset == Py_None || offset == NULL) + return offset; + if (PyDelta_Check(offset)) { + if (GET_TD_MICROSECONDS(offset) != 0 || GET_TD_SECONDS(offset) % 60 != 0) { + Py_DECREF(offset); + PyErr_Format(PyExc_ValueError, "offset must be a timedelta" + " representing a whole number of minutes"); + return NULL; + } + if ((GET_TD_DAYS(offset) == -1 && GET_TD_SECONDS(offset) == 0) || + GET_TD_DAYS(offset) < -1 || GET_TD_DAYS(offset) >= 1) { + Py_DECREF(offset); + PyErr_Format(PyExc_ValueError, "offset must be a timedelta" + " strictly between -timedelta(hours=24) and" + " timedelta(hours=24)."); + return NULL; + } + } + else { + Py_DECREF(offset); + PyErr_Format(PyExc_TypeError, + "tzinfo.%s() must return None or " + "timedelta, not '%.200s'", + name, Py_TYPE(offset)->tp_name); + return NULL; + } + + return offset; +} + +/* Call tzinfo.utcoffset(tzinfoarg), and extract an integer from the + * result. tzinfo must be an instance of the tzinfo class. If utcoffset() + * returns None, call_utcoffset returns 0 and sets *none to 1. If uctoffset() + * doesn't return None or timedelta, TypeError is raised and this returns -1. + * If utcoffset() returns an invalid timedelta (out of range, or not a whole + * # of minutes), ValueError is raised and this returns -1. Else *none is + * set to 0 and the offset is returned (as int # of minutes east of UTC). + */ +static PyObject * +call_utcoffset(PyObject *tzinfo, PyObject *tzinfoarg) +{ + return call_tzinfo_method(tzinfo, "utcoffset", tzinfoarg); +} + +/* Call tzinfo.dst(tzinfoarg), and extract an integer from the + * result. tzinfo must be an instance of the tzinfo class. If dst() + * returns None, call_dst returns 0 and sets *none to 1. If dst() + & doesn't return None or timedelta, TypeError is raised and this + * returns -1. If dst() returns an invalid timedelta for a UTC offset, + * ValueError is raised and this returns -1. Else *none is set to 0 and + * the offset is returned (as an int # of minutes east of UTC). + */ +static PyObject * +call_dst(PyObject *tzinfo, PyObject *tzinfoarg) +{ + return call_tzinfo_method(tzinfo, "dst", tzinfoarg); +} + +/* Call tzinfo.tzname(tzinfoarg), and return the result. tzinfo must be + * an instance of the tzinfo class or None. If tzinfo isn't None, and + * tzname() doesn't return None or a string, TypeError is raised and this + * returns NULL. If the result is a string, we ensure it is a Unicode + * string. + */ +static PyObject * +call_tzname(PyObject *tzinfo, PyObject *tzinfoarg) +{ + PyObject *result; + + assert(tzinfo != NULL); + assert(check_tzinfo_subclass(tzinfo) >= 0); + assert(tzinfoarg != NULL); + + if (tzinfo == Py_None) + Py_RETURN_NONE; + + result = PyObject_CallMethod(tzinfo, "tzname", "O", tzinfoarg); + + if (result == NULL || result == Py_None) + return result; + + if (!PyUnicode_Check(result)) { + PyErr_Format(PyExc_TypeError, "tzinfo.tzname() must " + "return None or a string, not '%s'", + Py_TYPE(result)->tp_name); + Py_DECREF(result); + result = NULL; + } + + return result; +} + +/* repr is like "someclass(arg1, arg2)". If tzinfo isn't None, + * stuff + * ", tzinfo=" + repr(tzinfo) + * before the closing ")". + */ +static PyObject * +append_keyword_tzinfo(PyObject *repr, PyObject *tzinfo) +{ + PyObject *temp; + + assert(PyUnicode_Check(repr)); + assert(tzinfo); + if (tzinfo == Py_None) + return repr; + /* Get rid of the trailing ')'. */ + assert(PyUnicode_AS_UNICODE(repr)[PyUnicode_GET_SIZE(repr)-1] == ')'); + temp = PyUnicode_FromUnicode(PyUnicode_AS_UNICODE(repr), + PyUnicode_GET_SIZE(repr) - 1); + Py_DECREF(repr); + if (temp == NULL) + return NULL; + repr = PyUnicode_FromFormat("%U, tzinfo=%R)", temp, tzinfo); + Py_DECREF(temp); + return repr; +} + +/* --------------------------------------------------------------------------- + * String format helpers. + */ + +static PyObject * +format_ctime(PyDateTime_Date *date, int hours, int minutes, int seconds) +{ + static const char *DayNames[] = { + "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun" + }; + static const char *MonthNames[] = { + "Jan", "Feb", "Mar", "Apr", "May", "Jun", + "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" + }; + + int wday = weekday(GET_YEAR(date), GET_MONTH(date), GET_DAY(date)); + + return PyUnicode_FromFormat("%s %s %2d %02d:%02d:%02d %04d", + DayNames[wday], MonthNames[GET_MONTH(date)-1], + GET_DAY(date), hours, minutes, seconds, + GET_YEAR(date)); +} + +static PyObject *delta_negative(PyDateTime_Delta *self); + +/* Add an hours & minutes UTC offset string to buf. buf has no more than + * buflen bytes remaining. The UTC offset is gotten by calling + * tzinfo.uctoffset(tzinfoarg). If that returns None, \0 is stored into + * *buf, and that's all. Else the returned value is checked for sanity (an + * integer in range), and if that's OK it's converted to an hours & minutes + * string of the form + * sign HH sep MM + * Returns 0 if everything is OK. If the return value from utcoffset() is + * bogus, an appropriate exception is set and -1 is returned. + */ +static int +format_utcoffset(char *buf, size_t buflen, const char *sep, + PyObject *tzinfo, PyObject *tzinfoarg) +{ + PyObject *offset; + int hours, minutes, seconds; + char sign; + + assert(buflen >= 1); + + offset = call_utcoffset(tzinfo, tzinfoarg); + if (offset == NULL) + return -1; + if (offset == Py_None) { + Py_DECREF(offset); + *buf = '\0'; + return 0; + } + /* Offset is normalized, so it is negative if days < 0 */ + if (GET_TD_DAYS(offset) < 0) { + PyObject *temp = offset; + sign = '-'; + offset = delta_negative((PyDateTime_Delta *)offset); + Py_DECREF(temp); + if (offset == NULL) + return -1; + } + else { + sign = '+'; + } + /* Offset is not negative here. */ + seconds = GET_TD_SECONDS(offset); + Py_DECREF(offset); + minutes = divmod(seconds, 60, &seconds); + hours = divmod(minutes, 60, &minutes); + assert(seconds == 0); + /* XXX ignore sub-minute data, curently not allowed. */ + PyOS_snprintf(buf, buflen, "%c%02d%s%02d", sign, hours, sep, minutes); + + return 0; +} + +static PyObject * +make_Zreplacement(PyObject *object, PyObject *tzinfoarg) +{ + PyObject *temp; + PyObject *tzinfo = get_tzinfo_member(object); + PyObject *Zreplacement = PyUnicode_FromStringAndSize(NULL, 0); + if (Zreplacement == NULL) + return NULL; + if (tzinfo == Py_None || tzinfo == NULL) + return Zreplacement; + + assert(tzinfoarg != NULL); + temp = call_tzname(tzinfo, tzinfoarg); + if (temp == NULL) + goto Error; + if (temp == Py_None) { + Py_DECREF(temp); + return Zreplacement; + } + + assert(PyUnicode_Check(temp)); + /* Since the tzname is getting stuffed into the + * format, we have to double any % signs so that + * strftime doesn't treat them as format codes. + */ + Py_DECREF(Zreplacement); + Zreplacement = PyObject_CallMethod(temp, "replace", "ss", "%", "%%"); + Py_DECREF(temp); + if (Zreplacement == NULL) + return NULL; + if (!PyUnicode_Check(Zreplacement)) { + PyErr_SetString(PyExc_TypeError, + "tzname.replace() did not return a string"); + goto Error; + } + return Zreplacement; + + Error: + Py_DECREF(Zreplacement); + return NULL; +} + +static PyObject * +make_freplacement(PyObject *object) +{ + char freplacement[64]; + if (PyTime_Check(object)) + sprintf(freplacement, "%06d", TIME_GET_MICROSECOND(object)); + else if (PyDateTime_Check(object)) + sprintf(freplacement, "%06d", DATE_GET_MICROSECOND(object)); + else + sprintf(freplacement, "%06d", 0); + + return PyBytes_FromStringAndSize(freplacement, strlen(freplacement)); +} + +/* I sure don't want to reproduce the strftime code from the time module, + * so this imports the module and calls it. All the hair is due to + * giving special meanings to the %z, %Z and %f format codes via a + * preprocessing step on the format string. + * tzinfoarg is the argument to pass to the object's tzinfo method, if + * needed. + */ +static PyObject * +wrap_strftime(PyObject *object, PyObject *format, PyObject *timetuple, + PyObject *tzinfoarg) +{ + PyObject *result = NULL; /* guilty until proved innocent */ + + PyObject *zreplacement = NULL; /* py string, replacement for %z */ + PyObject *Zreplacement = NULL; /* py string, replacement for %Z */ + PyObject *freplacement = NULL; /* py string, replacement for %f */ + + const char *pin; /* pointer to next char in input format */ + Py_ssize_t flen; /* length of input format */ + char ch; /* next char in input format */ + + PyObject *newfmt = NULL; /* py string, the output format */ + char *pnew; /* pointer to available byte in output format */ + size_t totalnew; /* number bytes total in output format buffer, + exclusive of trailing \0 */ + size_t usednew; /* number bytes used so far in output format buffer */ + + const char *ptoappend; /* ptr to string to append to output buffer */ + Py_ssize_t ntoappend; /* # of bytes to append to output buffer */ + + assert(object && format && timetuple); + assert(PyUnicode_Check(format)); + /* Convert the input format to a C string and size */ + pin = _PyUnicode_AsStringAndSize(format, &flen); + if (!pin) + return NULL; + + /* Give up if the year is before 1900. + * Python strftime() plays games with the year, and different + * games depending on whether envar PYTHON2K is set. This makes + * years before 1900 a nightmare, even if the platform strftime + * supports them (and not all do). + * We could get a lot farther here by avoiding Python's strftime + * wrapper and calling the C strftime() directly, but that isn't + * an option in the Python implementation of this module. + */ + { + long year; + PyObject *pyyear = PySequence_GetItem(timetuple, 0); + if (pyyear == NULL) return NULL; + assert(PyLong_Check(pyyear)); + year = PyLong_AsLong(pyyear); + Py_DECREF(pyyear); + if (year < 1900) { + PyErr_Format(PyExc_ValueError, "year=%ld is before " + "1900; the datetime strftime() " + "methods require year >= 1900", + year); + return NULL; + } + } + + /* Scan the input format, looking for %z/%Z/%f escapes, building + * a new format. Since computing the replacements for those codes + * is expensive, don't unless they're actually used. + */ + if (flen > INT_MAX - 1) { + PyErr_NoMemory(); + goto Done; + } + + totalnew = flen + 1; /* realistic if no %z/%Z */ + newfmt = PyBytes_FromStringAndSize(NULL, totalnew); + if (newfmt == NULL) goto Done; + pnew = PyBytes_AsString(newfmt); + usednew = 0; + + while ((ch = *pin++) != '\0') { + if (ch != '%') { + ptoappend = pin - 1; + ntoappend = 1; + } + else if ((ch = *pin++) == '\0') { + /* There's a lone trailing %; doesn't make sense. */ + PyErr_SetString(PyExc_ValueError, "strftime format " + "ends with raw %"); + goto Done; + } + /* A % has been seen and ch is the character after it. */ + else if (ch == 'z') { + if (zreplacement == NULL) { + /* format utcoffset */ + char buf[100]; + PyObject *tzinfo = get_tzinfo_member(object); + zreplacement = PyBytes_FromStringAndSize("", 0); + if (zreplacement == NULL) goto Done; + if (tzinfo != Py_None && tzinfo != NULL) { + assert(tzinfoarg != NULL); + if (format_utcoffset(buf, + sizeof(buf), + "", + tzinfo, + tzinfoarg) < 0) + goto Done; + Py_DECREF(zreplacement); + zreplacement = + PyBytes_FromStringAndSize(buf, + strlen(buf)); + if (zreplacement == NULL) + goto Done; + } + } + assert(zreplacement != NULL); + ptoappend = PyBytes_AS_STRING(zreplacement); + ntoappend = PyBytes_GET_SIZE(zreplacement); + } + else if (ch == 'Z') { + /* format tzname */ + if (Zreplacement == NULL) { + Zreplacement = make_Zreplacement(object, + tzinfoarg); + if (Zreplacement == NULL) + goto Done; + } + assert(Zreplacement != NULL); + assert(PyUnicode_Check(Zreplacement)); + ptoappend = _PyUnicode_AsStringAndSize(Zreplacement, + &ntoappend); + ntoappend = Py_SIZE(Zreplacement); + } + else if (ch == 'f') { + /* format microseconds */ + if (freplacement == NULL) { + freplacement = make_freplacement(object); + if (freplacement == NULL) + goto Done; + } + assert(freplacement != NULL); + assert(PyBytes_Check(freplacement)); + ptoappend = PyBytes_AS_STRING(freplacement); + ntoappend = PyBytes_GET_SIZE(freplacement); + } + else { + /* percent followed by neither z nor Z */ + ptoappend = pin - 2; + ntoappend = 2; + } + + /* Append the ntoappend chars starting at ptoappend to + * the new format. + */ + if (ntoappend == 0) + continue; + assert(ptoappend != NULL); + assert(ntoappend > 0); + while (usednew + ntoappend > totalnew) { + size_t bigger = totalnew << 1; + if ((bigger >> 1) != totalnew) { /* overflow */ + PyErr_NoMemory(); + goto Done; + } + if (_PyBytes_Resize(&newfmt, bigger) < 0) + goto Done; + totalnew = bigger; + pnew = PyBytes_AsString(newfmt) + usednew; + } + memcpy(pnew, ptoappend, ntoappend); + pnew += ntoappend; + usednew += ntoappend; + assert(usednew <= totalnew); + } /* end while() */ + + if (_PyBytes_Resize(&newfmt, usednew) < 0) + goto Done; + { + PyObject *format; + PyObject *time = PyImport_ImportModuleNoBlock("time"); + if (time == NULL) + goto Done; + format = PyUnicode_FromString(PyBytes_AS_STRING(newfmt)); + if (format != NULL) { + result = PyObject_CallMethod(time, "strftime", "OO", + format, timetuple, NULL); + Py_DECREF(format); + } + Py_DECREF(time); + } + Done: + Py_XDECREF(freplacement); + Py_XDECREF(zreplacement); + Py_XDECREF(Zreplacement); + Py_XDECREF(newfmt); + return result; +} + +/* --------------------------------------------------------------------------- + * Wrap functions from the time module. These aren't directly available + * from C. Perhaps they should be. + */ + +/* Call time.time() and return its result (a Python float). */ +static PyObject * +time_time(void) +{ + PyObject *result = NULL; + PyObject *time = PyImport_ImportModuleNoBlock("time"); + + if (time != NULL) { + result = PyObject_CallMethod(time, "time", "()"); + Py_DECREF(time); + } + return result; +} + +/* Build a time.struct_time. The weekday and day number are automatically + * computed from the y,m,d args. + */ +static PyObject * +build_struct_time(int y, int m, int d, int hh, int mm, int ss, int dstflag) +{ + PyObject *time; + PyObject *result = NULL; + + time = PyImport_ImportModuleNoBlock("time"); + if (time != NULL) { + result = PyObject_CallMethod(time, "struct_time", + "((iiiiiiiii))", + y, m, d, + hh, mm, ss, + weekday(y, m, d), + days_before_month(y, m) + d, + dstflag); + Py_DECREF(time); + } + return result; +} + +/* --------------------------------------------------------------------------- + * Miscellaneous helpers. + */ + +/* For various reasons, we need to use tp_richcompare instead of tp_reserved. + * The comparisons here all most naturally compute a cmp()-like result. + * This little helper turns that into a bool result for rich comparisons. + */ +static PyObject * +diff_to_bool(int diff, int op) +{ + PyObject *result; + int istrue; + + switch (op) { + case Py_EQ: istrue = diff == 0; break; + case Py_NE: istrue = diff != 0; break; + case Py_LE: istrue = diff <= 0; break; + case Py_GE: istrue = diff >= 0; break; + case Py_LT: istrue = diff < 0; break; + case Py_GT: istrue = diff > 0; break; + default: + assert(! "op unknown"); + istrue = 0; /* To shut up compiler */ + } + result = istrue ? Py_True : Py_False; + Py_INCREF(result); + return result; +} + +/* Raises a "can't compare" TypeError and returns NULL. */ +static PyObject * +cmperror(PyObject *a, PyObject *b) +{ + PyErr_Format(PyExc_TypeError, + "can't compare %s to %s", + Py_TYPE(a)->tp_name, Py_TYPE(b)->tp_name); + return NULL; +} + +/* --------------------------------------------------------------------------- + * Cached Python objects; these are set by the module init function. + */ + +/* Conversion factors. */ +static PyObject *us_per_us = NULL; /* 1 */ +static PyObject *us_per_ms = NULL; /* 1000 */ +static PyObject *us_per_second = NULL; /* 1000000 */ +static PyObject *us_per_minute = NULL; /* 1e6 * 60 as Python int */ +static PyObject *us_per_hour = NULL; /* 1e6 * 3600 as Python long */ +static PyObject *us_per_day = NULL; /* 1e6 * 3600 * 24 as Python long */ +static PyObject *us_per_week = NULL; /* 1e6*3600*24*7 as Python long */ +static PyObject *seconds_per_day = NULL; /* 3600*24 as Python int */ + +/* --------------------------------------------------------------------------- + * Class implementations. + */ + +/* + * PyDateTime_Delta implementation. + */ + +/* Convert a timedelta to a number of us, + * (24*3600*self.days + self.seconds)*1000000 + self.microseconds + * as a Python int or long. + * Doing mixed-radix arithmetic by hand instead is excruciating in C, + * due to ubiquitous overflow possibilities. + */ +static PyObject * +delta_to_microseconds(PyDateTime_Delta *self) +{ + PyObject *x1 = NULL; + PyObject *x2 = NULL; + PyObject *x3 = NULL; + PyObject *result = NULL; + + x1 = PyLong_FromLong(GET_TD_DAYS(self)); + if (x1 == NULL) + goto Done; + x2 = PyNumber_Multiply(x1, seconds_per_day); /* days in seconds */ + if (x2 == NULL) + goto Done; + Py_DECREF(x1); + x1 = NULL; + + /* x2 has days in seconds */ + x1 = PyLong_FromLong(GET_TD_SECONDS(self)); /* seconds */ + if (x1 == NULL) + goto Done; + x3 = PyNumber_Add(x1, x2); /* days and seconds in seconds */ + if (x3 == NULL) + goto Done; + Py_DECREF(x1); + Py_DECREF(x2); + x1 = x2 = NULL; + + /* x3 has days+seconds in seconds */ + x1 = PyNumber_Multiply(x3, us_per_second); /* us */ + if (x1 == NULL) + goto Done; + Py_DECREF(x3); + x3 = NULL; + + /* x1 has days+seconds in us */ + x2 = PyLong_FromLong(GET_TD_MICROSECONDS(self)); + if (x2 == NULL) + goto Done; + result = PyNumber_Add(x1, x2); + +Done: + Py_XDECREF(x1); + Py_XDECREF(x2); + Py_XDECREF(x3); + return result; +} + +/* Convert a number of us (as a Python int or long) to a timedelta. + */ +static PyObject * +microseconds_to_delta_ex(PyObject *pyus, PyTypeObject *type) +{ + int us; + int s; + int d; + long temp; + + PyObject *tuple = NULL; + PyObject *num = NULL; + PyObject *result = NULL; + + tuple = PyNumber_Divmod(pyus, us_per_second); + if (tuple == NULL) + goto Done; + + num = PyTuple_GetItem(tuple, 1); /* us */ + if (num == NULL) + goto Done; + temp = PyLong_AsLong(num); + num = NULL; + if (temp == -1 && PyErr_Occurred()) + goto Done; + assert(0 <= temp && temp < 1000000); + us = (int)temp; + if (us < 0) { + /* The divisor was positive, so this must be an error. */ + assert(PyErr_Occurred()); + goto Done; + } + + num = PyTuple_GetItem(tuple, 0); /* leftover seconds */ + if (num == NULL) + goto Done; + Py_INCREF(num); + Py_DECREF(tuple); + + tuple = PyNumber_Divmod(num, seconds_per_day); + if (tuple == NULL) + goto Done; + Py_DECREF(num); + + num = PyTuple_GetItem(tuple, 1); /* seconds */ + if (num == NULL) + goto Done; + temp = PyLong_AsLong(num); + num = NULL; + if (temp == -1 && PyErr_Occurred()) + goto Done; + assert(0 <= temp && temp < 24*3600); + s = (int)temp; + + if (s < 0) { + /* The divisor was positive, so this must be an error. */ + assert(PyErr_Occurred()); + goto Done; + } + + num = PyTuple_GetItem(tuple, 0); /* leftover days */ + if (num == NULL) + goto Done; + Py_INCREF(num); + temp = PyLong_AsLong(num); + if (temp == -1 && PyErr_Occurred()) + goto Done; + d = (int)temp; + if ((long)d != temp) { + PyErr_SetString(PyExc_OverflowError, "normalized days too " + "large to fit in a C int"); + goto Done; + } + result = new_delta_ex(d, s, us, 0, type); + +Done: + Py_XDECREF(tuple); + Py_XDECREF(num); + return result; +} + +#define microseconds_to_delta(pymicros) \ + microseconds_to_delta_ex(pymicros, &PyDateTime_DeltaType) + +static PyObject * +multiply_int_timedelta(PyObject *intobj, PyDateTime_Delta *delta) +{ + PyObject *pyus_in; + PyObject *pyus_out; + PyObject *result; + + pyus_in = delta_to_microseconds(delta); + if (pyus_in == NULL) + return NULL; + + pyus_out = PyNumber_Multiply(pyus_in, intobj); + Py_DECREF(pyus_in); + if (pyus_out == NULL) + return NULL; + + result = microseconds_to_delta(pyus_out); + Py_DECREF(pyus_out); + return result; +} + +static PyObject * +multiply_float_timedelta(PyObject *floatobj, PyDateTime_Delta *delta) +{ + PyObject *result = NULL; + PyObject *pyus_in = NULL, *temp, *pyus_out; + PyObject *ratio = NULL; + + pyus_in = delta_to_microseconds(delta); + if (pyus_in == NULL) + return NULL; + ratio = PyObject_CallMethod(floatobj, "as_integer_ratio", NULL); + if (ratio == NULL) + goto error; + temp = PyNumber_Multiply(pyus_in, PyTuple_GET_ITEM(ratio, 0)); + Py_DECREF(pyus_in); + pyus_in = NULL; + if (temp == NULL) + goto error; + pyus_out = divide_nearest(temp, PyTuple_GET_ITEM(ratio, 1)); + Py_DECREF(temp); + if (pyus_out == NULL) + goto error; + result = microseconds_to_delta(pyus_out); + Py_DECREF(pyus_out); + error: + Py_XDECREF(pyus_in); + Py_XDECREF(ratio); + + return result; +} + +static PyObject * +divide_timedelta_int(PyDateTime_Delta *delta, PyObject *intobj) +{ + PyObject *pyus_in; + PyObject *pyus_out; + PyObject *result; + + pyus_in = delta_to_microseconds(delta); + if (pyus_in == NULL) + return NULL; + + pyus_out = PyNumber_FloorDivide(pyus_in, intobj); + Py_DECREF(pyus_in); + if (pyus_out == NULL) + return NULL; + + result = microseconds_to_delta(pyus_out); + Py_DECREF(pyus_out); + return result; +} + +static PyObject * +divide_timedelta_timedelta(PyDateTime_Delta *left, PyDateTime_Delta *right) +{ + PyObject *pyus_left; + PyObject *pyus_right; + PyObject *result; + + pyus_left = delta_to_microseconds(left); + if (pyus_left == NULL) + return NULL; + + pyus_right = delta_to_microseconds(right); + if (pyus_right == NULL) { + Py_DECREF(pyus_left); + return NULL; + } + + result = PyNumber_FloorDivide(pyus_left, pyus_right); + Py_DECREF(pyus_left); + Py_DECREF(pyus_right); + return result; +} + +static PyObject * +truedivide_timedelta_timedelta(PyDateTime_Delta *left, PyDateTime_Delta *right) +{ + PyObject *pyus_left; + PyObject *pyus_right; + PyObject *result; + + pyus_left = delta_to_microseconds(left); + if (pyus_left == NULL) + return NULL; + + pyus_right = delta_to_microseconds(right); + if (pyus_right == NULL) { + Py_DECREF(pyus_left); + return NULL; + } + + result = PyNumber_TrueDivide(pyus_left, pyus_right); + Py_DECREF(pyus_left); + Py_DECREF(pyus_right); + return result; +} + +static PyObject * +truedivide_timedelta_float(PyDateTime_Delta *delta, PyObject *f) +{ + PyObject *result = NULL; + PyObject *pyus_in = NULL, *temp, *pyus_out; + PyObject *ratio = NULL; + + pyus_in = delta_to_microseconds(delta); + if (pyus_in == NULL) + return NULL; + ratio = PyObject_CallMethod(f, "as_integer_ratio", NULL); + if (ratio == NULL) + goto error; + temp = PyNumber_Multiply(pyus_in, PyTuple_GET_ITEM(ratio, 1)); + Py_DECREF(pyus_in); + pyus_in = NULL; + if (temp == NULL) + goto error; + pyus_out = divide_nearest(temp, PyTuple_GET_ITEM(ratio, 0)); + Py_DECREF(temp); + if (pyus_out == NULL) + goto error; + result = microseconds_to_delta(pyus_out); + Py_DECREF(pyus_out); + error: + Py_XDECREF(pyus_in); + Py_XDECREF(ratio); + + return result; +} + +static PyObject * +truedivide_timedelta_int(PyDateTime_Delta *delta, PyObject *i) +{ + PyObject *result; + PyObject *pyus_in, *pyus_out; + pyus_in = delta_to_microseconds(delta); + if (pyus_in == NULL) + return NULL; + pyus_out = divide_nearest(pyus_in, i); + Py_DECREF(pyus_in); + if (pyus_out == NULL) + return NULL; + result = microseconds_to_delta(pyus_out); + Py_DECREF(pyus_out); + + return result; +} + +static PyObject * +delta_add(PyObject *left, PyObject *right) +{ + PyObject *result = Py_NotImplemented; + + if (PyDelta_Check(left) && PyDelta_Check(right)) { + /* delta + delta */ + /* The C-level additions can't overflow because of the + * invariant bounds. + */ + int days = GET_TD_DAYS(left) + GET_TD_DAYS(right); + int seconds = GET_TD_SECONDS(left) + GET_TD_SECONDS(right); + int microseconds = GET_TD_MICROSECONDS(left) + + GET_TD_MICROSECONDS(right); + result = new_delta(days, seconds, microseconds, 1); + } + + if (result == Py_NotImplemented) + Py_INCREF(result); + return result; +} + +static PyObject * +delta_negative(PyDateTime_Delta *self) +{ + return new_delta(-GET_TD_DAYS(self), + -GET_TD_SECONDS(self), + -GET_TD_MICROSECONDS(self), + 1); +} + +static PyObject * +delta_positive(PyDateTime_Delta *self) +{ + /* Could optimize this (by returning self) if this isn't a + * subclass -- but who uses unary + ? Approximately nobody. + */ + return new_delta(GET_TD_DAYS(self), + GET_TD_SECONDS(self), + GET_TD_MICROSECONDS(self), + 0); +} + +static PyObject * +delta_abs(PyDateTime_Delta *self) +{ + PyObject *result; + + assert(GET_TD_MICROSECONDS(self) >= 0); + assert(GET_TD_SECONDS(self) >= 0); + + if (GET_TD_DAYS(self) < 0) + result = delta_negative(self); + else + result = delta_positive(self); + + return result; +} + +static PyObject * +delta_subtract(PyObject *left, PyObject *right) +{ + PyObject *result = Py_NotImplemented; + + if (PyDelta_Check(left) && PyDelta_Check(right)) { + /* delta - delta */ + PyObject *minus_right = PyNumber_Negative(right); + if (minus_right) { + result = delta_add(left, minus_right); + Py_DECREF(minus_right); + } + else + result = NULL; + } + + if (result == Py_NotImplemented) + Py_INCREF(result); + return result; +} + +static int +delta_cmp(PyObject *self, PyObject *other) +{ + int diff = GET_TD_DAYS(self) - GET_TD_DAYS(other); + if (diff == 0) { + diff = GET_TD_SECONDS(self) - GET_TD_SECONDS(other); + if (diff == 0) + diff = GET_TD_MICROSECONDS(self) - + GET_TD_MICROSECONDS(other); + } + return diff; +} + +static PyObject * +delta_richcompare(PyObject *self, PyObject *other, int op) +{ + if (PyDelta_Check(other)) { + int diff = delta_cmp(self, other); + return diff_to_bool(diff, op); + } + else { + Py_INCREF(Py_NotImplemented); + return Py_NotImplemented; + } +} + +static PyObject *delta_getstate(PyDateTime_Delta *self); + +static long +delta_hash(PyDateTime_Delta *self) +{ + if (self->hashcode == -1) { + PyObject *temp = delta_getstate(self); + if (temp != NULL) { + self->hashcode = PyObject_Hash(temp); + Py_DECREF(temp); + } + } + return self->hashcode; +} + +static PyObject * +delta_multiply(PyObject *left, PyObject *right) +{ + PyObject *result = Py_NotImplemented; + + if (PyDelta_Check(left)) { + /* delta * ??? */ + if (PyLong_Check(right)) + result = multiply_int_timedelta(right, + (PyDateTime_Delta *) left); + else if (PyFloat_Check(right)) + result = multiply_float_timedelta(right, + (PyDateTime_Delta *) left); + } + else if (PyLong_Check(left)) + result = multiply_int_timedelta(left, + (PyDateTime_Delta *) right); + else if (PyFloat_Check(left)) + result = multiply_float_timedelta(left, + (PyDateTime_Delta *) right); + + if (result == Py_NotImplemented) + Py_INCREF(result); + return result; +} + +static PyObject * +delta_divide(PyObject *left, PyObject *right) +{ + PyObject *result = Py_NotImplemented; + + if (PyDelta_Check(left)) { + /* delta * ??? */ + if (PyLong_Check(right)) + result = divide_timedelta_int( + (PyDateTime_Delta *)left, + right); + else if (PyDelta_Check(right)) + result = divide_timedelta_timedelta( + (PyDateTime_Delta *)left, + (PyDateTime_Delta *)right); + } + + if (result == Py_NotImplemented) + Py_INCREF(result); + return result; +} + +static PyObject * +delta_truedivide(PyObject *left, PyObject *right) +{ + PyObject *result = Py_NotImplemented; + + if (PyDelta_Check(left)) { + if (PyDelta_Check(right)) + result = truedivide_timedelta_timedelta( + (PyDateTime_Delta *)left, + (PyDateTime_Delta *)right); + else if (PyFloat_Check(right)) + result = truedivide_timedelta_float( + (PyDateTime_Delta *)left, right); + else if (PyLong_Check(right)) + result = truedivide_timedelta_int( + (PyDateTime_Delta *)left, right); + } + + if (result == Py_NotImplemented) + Py_INCREF(result); + return result; +} + +static PyObject * +delta_remainder(PyObject *left, PyObject *right) +{ + PyObject *pyus_left; + PyObject *pyus_right; + PyObject *pyus_remainder; + PyObject *remainder; + + if (!PyDelta_Check(left) || !PyDelta_Check(right)) { + Py_INCREF(Py_NotImplemented); + return Py_NotImplemented; + } + + pyus_left = delta_to_microseconds((PyDateTime_Delta *)left); + if (pyus_left == NULL) + return NULL; + + pyus_right = delta_to_microseconds((PyDateTime_Delta *)right); + if (pyus_right == NULL) { + Py_DECREF(pyus_left); + return NULL; + } + + pyus_remainder = PyNumber_Remainder(pyus_left, pyus_right); + Py_DECREF(pyus_left); + Py_DECREF(pyus_right); + if (pyus_remainder == NULL) + return NULL; + + remainder = microseconds_to_delta(pyus_remainder); + Py_DECREF(pyus_remainder); + if (remainder == NULL) + return NULL; + + return remainder; +} + +static PyObject * +delta_divmod(PyObject *left, PyObject *right) +{ + PyObject *pyus_left; + PyObject *pyus_right; + PyObject *divmod; + PyObject *delta; + PyObject *result; + + if (!PyDelta_Check(left) || !PyDelta_Check(right)) { + Py_INCREF(Py_NotImplemented); + return Py_NotImplemented; + } + + pyus_left = delta_to_microseconds((PyDateTime_Delta *)left); + if (pyus_left == NULL) + return NULL; + + pyus_right = delta_to_microseconds((PyDateTime_Delta *)right); + if (pyus_right == NULL) { + Py_DECREF(pyus_left); + return NULL; + } + + divmod = PyNumber_Divmod(pyus_left, pyus_right); + Py_DECREF(pyus_left); + Py_DECREF(pyus_right); + if (divmod == NULL) + return NULL; + + assert(PyTuple_Size(divmod) == 2); + delta = microseconds_to_delta(PyTuple_GET_ITEM(divmod, 1)); + if (delta == NULL) { + Py_DECREF(divmod); + return NULL; + } + result = PyTuple_Pack(2, PyTuple_GET_ITEM(divmod, 0), delta); + Py_DECREF(delta); + Py_DECREF(divmod); + return result; +} + +/* Fold in the value of the tag ("seconds", "weeks", etc) component of a + * timedelta constructor. sofar is the # of microseconds accounted for + * so far, and there are factor microseconds per current unit, the number + * of which is given by num. num * factor is added to sofar in a + * numerically careful way, and that's the result. Any fractional + * microseconds left over (this can happen if num is a float type) are + * added into *leftover. + * Note that there are many ways this can give an error (NULL) return. + */ +static PyObject * +accum(const char* tag, PyObject *sofar, PyObject *num, PyObject *factor, + double *leftover) +{ + PyObject *prod; + PyObject *sum; + + assert(num != NULL); + + if (PyLong_Check(num)) { + prod = PyNumber_Multiply(num, factor); + if (prod == NULL) + return NULL; + sum = PyNumber_Add(sofar, prod); + Py_DECREF(prod); + return sum; + } + + if (PyFloat_Check(num)) { + double dnum; + double fracpart; + double intpart; + PyObject *x; + PyObject *y; + + /* The Plan: decompose num into an integer part and a + * fractional part, num = intpart + fracpart. + * Then num * factor == + * intpart * factor + fracpart * factor + * and the LHS can be computed exactly in long arithmetic. + * The RHS is again broken into an int part and frac part. + * and the frac part is added into *leftover. + */ + dnum = PyFloat_AsDouble(num); + if (dnum == -1.0 && PyErr_Occurred()) + return NULL; + fracpart = modf(dnum, &intpart); + x = PyLong_FromDouble(intpart); + if (x == NULL) + return NULL; + + prod = PyNumber_Multiply(x, factor); + Py_DECREF(x); + if (prod == NULL) + return NULL; + + sum = PyNumber_Add(sofar, prod); + Py_DECREF(prod); + if (sum == NULL) + return NULL; + + if (fracpart == 0.0) + return sum; + /* So far we've lost no information. Dealing with the + * fractional part requires float arithmetic, and may + * lose a little info. + */ + assert(PyLong_Check(factor)); + dnum = PyLong_AsDouble(factor); + + dnum *= fracpart; + fracpart = modf(dnum, &intpart); + x = PyLong_FromDouble(intpart); + if (x == NULL) { + Py_DECREF(sum); + return NULL; + } + + y = PyNumber_Add(sum, x); + Py_DECREF(sum); + Py_DECREF(x); + *leftover += fracpart; + return y; + } + + PyErr_Format(PyExc_TypeError, + "unsupported type for timedelta %s component: %s", + tag, Py_TYPE(num)->tp_name); + return NULL; +} + +static PyObject * +delta_new(PyTypeObject *type, PyObject *args, PyObject *kw) +{ + PyObject *self = NULL; + + /* Argument objects. */ + PyObject *day = NULL; + PyObject *second = NULL; + PyObject *us = NULL; + PyObject *ms = NULL; + PyObject *minute = NULL; + PyObject *hour = NULL; + PyObject *week = NULL; + + PyObject *x = NULL; /* running sum of microseconds */ + PyObject *y = NULL; /* temp sum of microseconds */ + double leftover_us = 0.0; + + static char *keywords[] = { + "days", "seconds", "microseconds", "milliseconds", + "minutes", "hours", "weeks", NULL + }; + + if (PyArg_ParseTupleAndKeywords(args, kw, "|OOOOOOO:__new__", + keywords, + &day, &second, &us, + &ms, &minute, &hour, &week) == 0) + goto Done; + + x = PyLong_FromLong(0); + if (x == NULL) + goto Done; + +#define CLEANUP \ + Py_DECREF(x); \ + x = y; \ + if (x == NULL) \ + goto Done + + if (us) { + y = accum("microseconds", x, us, us_per_us, &leftover_us); + CLEANUP; + } + if (ms) { + y = accum("milliseconds", x, ms, us_per_ms, &leftover_us); + CLEANUP; + } + if (second) { + y = accum("seconds", x, second, us_per_second, &leftover_us); + CLEANUP; + } + if (minute) { + y = accum("minutes", x, minute, us_per_minute, &leftover_us); + CLEANUP; + } + if (hour) { + y = accum("hours", x, hour, us_per_hour, &leftover_us); + CLEANUP; + } + if (day) { + y = accum("days", x, day, us_per_day, &leftover_us); + CLEANUP; + } + if (week) { + y = accum("weeks", x, week, us_per_week, &leftover_us); + CLEANUP; + } + if (leftover_us) { + /* Round to nearest whole # of us, and add into x. */ + PyObject *temp = PyLong_FromLong(round_to_long(leftover_us)); + if (temp == NULL) { + Py_DECREF(x); + goto Done; + } + y = PyNumber_Add(x, temp); + Py_DECREF(temp); + CLEANUP; + } + + self = microseconds_to_delta_ex(x, type); + Py_DECREF(x); +Done: + return self; + +#undef CLEANUP +} + +static int +delta_bool(PyDateTime_Delta *self) +{ + return (GET_TD_DAYS(self) != 0 + || GET_TD_SECONDS(self) != 0 + || GET_TD_MICROSECONDS(self) != 0); +} + +static PyObject * +delta_repr(PyDateTime_Delta *self) +{ + if (GET_TD_MICROSECONDS(self) != 0) + return PyUnicode_FromFormat("%s(%d, %d, %d)", + Py_TYPE(self)->tp_name, + GET_TD_DAYS(self), + GET_TD_SECONDS(self), + GET_TD_MICROSECONDS(self)); + if (GET_TD_SECONDS(self) != 0) + return PyUnicode_FromFormat("%s(%d, %d)", + Py_TYPE(self)->tp_name, + GET_TD_DAYS(self), + GET_TD_SECONDS(self)); + + return PyUnicode_FromFormat("%s(%d)", + Py_TYPE(self)->tp_name, + GET_TD_DAYS(self)); +} + +static PyObject * +delta_str(PyDateTime_Delta *self) +{ + int us = GET_TD_MICROSECONDS(self); + int seconds = GET_TD_SECONDS(self); + int minutes = divmod(seconds, 60, &seconds); + int hours = divmod(minutes, 60, &minutes); + int days = GET_TD_DAYS(self); + + if (days) { + if (us) + return PyUnicode_FromFormat("%d day%s, %d:%02d:%02d.%06d", + days, (days == 1 || days == -1) ? "" : "s", + hours, minutes, seconds, us); + else + return PyUnicode_FromFormat("%d day%s, %d:%02d:%02d", + days, (days == 1 || days == -1) ? "" : "s", + hours, minutes, seconds); + } else { + if (us) + return PyUnicode_FromFormat("%d:%02d:%02d.%06d", + hours, minutes, seconds, us); + else + return PyUnicode_FromFormat("%d:%02d:%02d", + hours, minutes, seconds); + } + +} + +/* Pickle support, a simple use of __reduce__. */ + +/* __getstate__ isn't exposed */ +static PyObject * +delta_getstate(PyDateTime_Delta *self) +{ + return Py_BuildValue("iii", GET_TD_DAYS(self), + GET_TD_SECONDS(self), + GET_TD_MICROSECONDS(self)); +} + +static PyObject * +delta_total_seconds(PyObject *self) +{ + PyObject *total_seconds; + PyObject *total_microseconds; + PyObject *one_million; + + total_microseconds = delta_to_microseconds((PyDateTime_Delta *)self); + if (total_microseconds == NULL) + return NULL; + + one_million = PyLong_FromLong(1000000L); + if (one_million == NULL) { + Py_DECREF(total_microseconds); + return NULL; + } + + total_seconds = PyNumber_TrueDivide(total_microseconds, one_million); + + Py_DECREF(total_microseconds); + Py_DECREF(one_million); + return total_seconds; +} + +static PyObject * +delta_reduce(PyDateTime_Delta* self) +{ + return Py_BuildValue("ON", Py_TYPE(self), delta_getstate(self)); +} + +#define OFFSET(field) offsetof(PyDateTime_Delta, field) + +static PyMemberDef delta_members[] = { + + {"days", T_INT, OFFSET(days), READONLY, + PyDoc_STR("Number of days.")}, + + {"seconds", T_INT, OFFSET(seconds), READONLY, + PyDoc_STR("Number of seconds (>= 0 and less than 1 day).")}, + + {"microseconds", T_INT, OFFSET(microseconds), READONLY, + PyDoc_STR("Number of microseconds (>= 0 and less than 1 second).")}, + {NULL} +}; + +static PyMethodDef delta_methods[] = { + {"total_seconds", (PyCFunction)delta_total_seconds, METH_NOARGS, + PyDoc_STR("Total seconds in the duration.")}, + + {"__reduce__", (PyCFunction)delta_reduce, METH_NOARGS, + PyDoc_STR("__reduce__() -> (cls, state)")}, + + {NULL, NULL}, +}; + +static char delta_doc[] = +PyDoc_STR("Difference between two datetime values."); + +static PyNumberMethods delta_as_number = { + delta_add, /* nb_add */ + delta_subtract, /* nb_subtract */ + delta_multiply, /* nb_multiply */ + delta_remainder, /* nb_remainder */ + delta_divmod, /* nb_divmod */ + 0, /* nb_power */ + (unaryfunc)delta_negative, /* nb_negative */ + (unaryfunc)delta_positive, /* nb_positive */ + (unaryfunc)delta_abs, /* nb_absolute */ + (inquiry)delta_bool, /* nb_bool */ + 0, /*nb_invert*/ + 0, /*nb_lshift*/ + 0, /*nb_rshift*/ + 0, /*nb_and*/ + 0, /*nb_xor*/ + 0, /*nb_or*/ + 0, /*nb_int*/ + 0, /*nb_reserved*/ + 0, /*nb_float*/ + 0, /*nb_inplace_add*/ + 0, /*nb_inplace_subtract*/ + 0, /*nb_inplace_multiply*/ + 0, /*nb_inplace_remainder*/ + 0, /*nb_inplace_power*/ + 0, /*nb_inplace_lshift*/ + 0, /*nb_inplace_rshift*/ + 0, /*nb_inplace_and*/ + 0, /*nb_inplace_xor*/ + 0, /*nb_inplace_or*/ + delta_divide, /* nb_floor_divide */ + delta_truedivide, /* nb_true_divide */ + 0, /* nb_inplace_floor_divide */ + 0, /* nb_inplace_true_divide */ +}; + +static PyTypeObject PyDateTime_DeltaType = { + PyVarObject_HEAD_INIT(NULL, 0) + "datetime.timedelta", /* tp_name */ + sizeof(PyDateTime_Delta), /* tp_basicsize */ + 0, /* tp_itemsize */ + 0, /* tp_dealloc */ + 0, /* tp_print */ + 0, /* tp_getattr */ + 0, /* tp_setattr */ + 0, /* tp_reserved */ + (reprfunc)delta_repr, /* tp_repr */ + &delta_as_number, /* tp_as_number */ + 0, /* tp_as_sequence */ + 0, /* tp_as_mapping */ + (hashfunc)delta_hash, /* tp_hash */ + 0, /* tp_call */ + (reprfunc)delta_str, /* tp_str */ + PyObject_GenericGetAttr, /* tp_getattro */ + 0, /* tp_setattro */ + 0, /* tp_as_buffer */ + Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */ + delta_doc, /* tp_doc */ + 0, /* tp_traverse */ + 0, /* tp_clear */ + delta_richcompare, /* tp_richcompare */ + 0, /* tp_weaklistoffset */ + 0, /* tp_iter */ + 0, /* tp_iternext */ + delta_methods, /* tp_methods */ + delta_members, /* tp_members */ + 0, /* tp_getset */ + 0, /* tp_base */ + 0, /* tp_dict */ + 0, /* tp_descr_get */ + 0, /* tp_descr_set */ + 0, /* tp_dictoffset */ + 0, /* tp_init */ + 0, /* tp_alloc */ + delta_new, /* tp_new */ + 0, /* tp_free */ +}; + +/* + * PyDateTime_Date implementation. + */ + +/* Accessor properties. */ + +static PyObject * +date_year(PyDateTime_Date *self, void *unused) +{ + return PyLong_FromLong(GET_YEAR(self)); +} + +static PyObject * +date_month(PyDateTime_Date *self, void *unused) +{ + return PyLong_FromLong(GET_MONTH(self)); +} + +static PyObject * +date_day(PyDateTime_Date *self, void *unused) +{ + return PyLong_FromLong(GET_DAY(self)); +} + +static PyGetSetDef date_getset[] = { + {"year", (getter)date_year}, + {"month", (getter)date_month}, + {"day", (getter)date_day}, + {NULL} +}; + +/* Constructors. */ + +static char *date_kws[] = {"year", "month", "day", NULL}; + +static PyObject * +date_new(PyTypeObject *type, PyObject *args, PyObject *kw) +{ + PyObject *self = NULL; + PyObject *state; + int year; + int month; + int day; + + /* Check for invocation from pickle with __getstate__ state */ + if (PyTuple_GET_SIZE(args) == 1 && + PyBytes_Check(state = PyTuple_GET_ITEM(args, 0)) && + PyBytes_GET_SIZE(state) == _PyDateTime_DATE_DATASIZE && + MONTH_IS_SANE(PyBytes_AS_STRING(state)[2])) + { + PyDateTime_Date *me; + + me = (PyDateTime_Date *) (type->tp_alloc(type, 0)); + if (me != NULL) { + char *pdata = PyBytes_AS_STRING(state); + memcpy(me->data, pdata, _PyDateTime_DATE_DATASIZE); + me->hashcode = -1; + } + return (PyObject *)me; + } + + if (PyArg_ParseTupleAndKeywords(args, kw, "iii", date_kws, + &year, &month, &day)) { + if (check_date_args(year, month, day) < 0) + return NULL; + self = new_date_ex(year, month, day, type); + } + return self; +} + +/* Return new date from localtime(t). */ +static PyObject * +date_local_from_time_t(PyObject *cls, double ts) +{ + struct tm *tm; + time_t t; + PyObject *result = NULL; + + t = _PyTime_DoubleToTimet(ts); + if (t == (time_t)-1 && PyErr_Occurred()) + return NULL; + tm = localtime(&t); + if (tm) + result = PyObject_CallFunction(cls, "iii", + tm->tm_year + 1900, + tm->tm_mon + 1, + tm->tm_mday); + else + PyErr_SetString(PyExc_ValueError, + "timestamp out of range for " + "platform localtime() function"); + return result; +} + +/* Return new date from current time. + * We say this is equivalent to fromtimestamp(time.time()), and the + * only way to be sure of that is to *call* time.time(). That's not + * generally the same as calling C's time. + */ +static PyObject * +date_today(PyObject *cls, PyObject *dummy) +{ + PyObject *time; + PyObject *result; + + time = time_time(); + if (time == NULL) + return NULL; + + /* Note well: today() is a class method, so this may not call + * date.fromtimestamp. For example, it may call + * datetime.fromtimestamp. That's why we need all the accuracy + * time.time() delivers; if someone were gonzo about optimization, + * date.today() could get away with plain C time(). + */ + result = PyObject_CallMethod(cls, "fromtimestamp", "O", time); + Py_DECREF(time); + return result; +} + +/* Return new date from given timestamp (Python timestamp -- a double). */ +static PyObject * +date_fromtimestamp(PyObject *cls, PyObject *args) +{ + double timestamp; + PyObject *result = NULL; + + if (PyArg_ParseTuple(args, "d:fromtimestamp", ×tamp)) + result = date_local_from_time_t(cls, timestamp); + return result; +} + +/* Return new date from proleptic Gregorian ordinal. Raises ValueError if + * the ordinal is out of range. + */ +static PyObject * +date_fromordinal(PyObject *cls, PyObject *args) +{ + PyObject *result = NULL; + int ordinal; + + if (PyArg_ParseTuple(args, "i:fromordinal", &ordinal)) { + int year; + int month; + int day; + + if (ordinal < 1) + PyErr_SetString(PyExc_ValueError, "ordinal must be " + ">= 1"); + else { + ord_to_ymd(ordinal, &year, &month, &day); + result = PyObject_CallFunction(cls, "iii", + year, month, day); + } + } + return result; +} + +/* + * Date arithmetic. + */ + +/* date + timedelta -> date. If arg negate is true, subtract the timedelta + * instead. + */ +static PyObject * +add_date_timedelta(PyDateTime_Date *date, PyDateTime_Delta *delta, int negate) +{ + PyObject *result = NULL; + int year = GET_YEAR(date); + int month = GET_MONTH(date); + int deltadays = GET_TD_DAYS(delta); + /* C-level overflow is impossible because |deltadays| < 1e9. */ + int day = GET_DAY(date) + (negate ? -deltadays : deltadays); + + if (normalize_date(&year, &month, &day) >= 0) + result = new_date(year, month, day); + return result; +} + +static PyObject * +date_add(PyObject *left, PyObject *right) +{ + if (PyDateTime_Check(left) || PyDateTime_Check(right)) { + Py_INCREF(Py_NotImplemented); + return Py_NotImplemented; + } + if (PyDate_Check(left)) { + /* date + ??? */ + if (PyDelta_Check(right)) + /* date + delta */ + return add_date_timedelta((PyDateTime_Date *) left, + (PyDateTime_Delta *) right, + 0); + } + else { + /* ??? + date + * 'right' must be one of us, or we wouldn't have been called + */ + if (PyDelta_Check(left)) + /* delta + date */ + return add_date_timedelta((PyDateTime_Date *) right, + (PyDateTime_Delta *) left, + 0); + } + Py_INCREF(Py_NotImplemented); + return Py_NotImplemented; +} + +static PyObject * +date_subtract(PyObject *left, PyObject *right) +{ + if (PyDateTime_Check(left) || PyDateTime_Check(right)) { + Py_INCREF(Py_NotImplemented); + return Py_NotImplemented; + } + if (PyDate_Check(left)) { + if (PyDate_Check(right)) { + /* date - date */ + int left_ord = ymd_to_ord(GET_YEAR(left), + GET_MONTH(left), + GET_DAY(left)); + int right_ord = ymd_to_ord(GET_YEAR(right), + GET_MONTH(right), + GET_DAY(right)); + return new_delta(left_ord - right_ord, 0, 0, 0); + } + if (PyDelta_Check(right)) { + /* date - delta */ + return add_date_timedelta((PyDateTime_Date *) left, + (PyDateTime_Delta *) right, + 1); + } + } + Py_INCREF(Py_NotImplemented); + return Py_NotImplemented; +} + + +/* Various ways to turn a date into a string. */ + +static PyObject * +date_repr(PyDateTime_Date *self) +{ + return PyUnicode_FromFormat("%s(%d, %d, %d)", + Py_TYPE(self)->tp_name, + GET_YEAR(self), GET_MONTH(self), GET_DAY(self)); +} + +static PyObject * +date_isoformat(PyDateTime_Date *self) +{ + return PyUnicode_FromFormat("%04d-%02d-%02d", + GET_YEAR(self), GET_MONTH(self), GET_DAY(self)); +} + +/* str() calls the appropriate isoformat() method. */ +static PyObject * +date_str(PyDateTime_Date *self) +{ + return PyObject_CallMethod((PyObject *)self, "isoformat", "()"); +} + + +static PyObject * +date_ctime(PyDateTime_Date *self) +{ + return format_ctime(self, 0, 0, 0); +} + +static PyObject * +date_strftime(PyDateTime_Date *self, PyObject *args, PyObject *kw) +{ + /* This method can be inherited, and needs to call the + * timetuple() method appropriate to self's class. + */ + PyObject *result; + PyObject *tuple; + PyObject *format; + static char *keywords[] = {"format", NULL}; + + if (! PyArg_ParseTupleAndKeywords(args, kw, "U:strftime", keywords, + &format)) + return NULL; + + tuple = PyObject_CallMethod((PyObject *)self, "timetuple", "()"); + if (tuple == NULL) + return NULL; + result = wrap_strftime((PyObject *)self, format, tuple, + (PyObject *)self); + Py_DECREF(tuple); + return result; +} + +static PyObject * +date_format(PyDateTime_Date *self, PyObject *args) +{ + PyObject *format; + + if (!PyArg_ParseTuple(args, "U:__format__", &format)) + return NULL; + + /* if the format is zero length, return str(self) */ + if (PyUnicode_GetSize(format) == 0) + return PyObject_Str((PyObject *)self); + + return PyObject_CallMethod((PyObject *)self, "strftime", "O", format); +} + +/* ISO methods. */ + +static PyObject * +date_isoweekday(PyDateTime_Date *self) +{ + int dow = weekday(GET_YEAR(self), GET_MONTH(self), GET_DAY(self)); + + return PyLong_FromLong(dow + 1); +} + +static PyObject * +date_isocalendar(PyDateTime_Date *self) +{ + int year = GET_YEAR(self); + int week1_monday = iso_week1_monday(year); + int today = ymd_to_ord(year, GET_MONTH(self), GET_DAY(self)); + int week; + int day; + + week = divmod(today - week1_monday, 7, &day); + if (week < 0) { + --year; + week1_monday = iso_week1_monday(year); + week = divmod(today - week1_monday, 7, &day); + } + else if (week >= 52 && today >= iso_week1_monday(year + 1)) { + ++year; + week = 0; + } + return Py_BuildValue("iii", year, week + 1, day + 1); +} + +/* Miscellaneous methods. */ + +static PyObject * +date_richcompare(PyObject *self, PyObject *other, int op) +{ + if (PyDate_Check(other)) { + int diff = memcmp(((PyDateTime_Date *)self)->data, + ((PyDateTime_Date *)other)->data, + _PyDateTime_DATE_DATASIZE); + return diff_to_bool(diff, op); + } + else { + Py_INCREF(Py_NotImplemented); + return Py_NotImplemented; + } +} + +static PyObject * +date_timetuple(PyDateTime_Date *self) +{ + return build_struct_time(GET_YEAR(self), + GET_MONTH(self), + GET_DAY(self), + 0, 0, 0, -1); +} + +static PyObject * +date_replace(PyDateTime_Date *self, PyObject *args, PyObject *kw) +{ + PyObject *clone; + PyObject *tuple; + int year = GET_YEAR(self); + int month = GET_MONTH(self); + int day = GET_DAY(self); + + if (! PyArg_ParseTupleAndKeywords(args, kw, "|iii:replace", date_kws, + &year, &month, &day)) + return NULL; + tuple = Py_BuildValue("iii", year, month, day); + if (tuple == NULL) + return NULL; + clone = date_new(Py_TYPE(self), tuple, NULL); + Py_DECREF(tuple); + return clone; +} + +/* + Borrowed from stringobject.c, originally it was string_hash() +*/ +static long +generic_hash(unsigned char *data, int len) +{ + register unsigned char *p; + register long x; + + p = (unsigned char *) data; + x = *p << 7; + while (--len >= 0) + x = (1000003*x) ^ *p++; + x ^= len; + if (x == -1) + x = -2; + + return x; +} + + +static PyObject *date_getstate(PyDateTime_Date *self); + +static long +date_hash(PyDateTime_Date *self) +{ + if (self->hashcode == -1) + self->hashcode = generic_hash( + (unsigned char *)self->data, _PyDateTime_DATE_DATASIZE); + + return self->hashcode; +} + +static PyObject * +date_toordinal(PyDateTime_Date *self) +{ + return PyLong_FromLong(ymd_to_ord(GET_YEAR(self), GET_MONTH(self), + GET_DAY(self))); +} + +static PyObject * +date_weekday(PyDateTime_Date *self) +{ + int dow = weekday(GET_YEAR(self), GET_MONTH(self), GET_DAY(self)); + + return PyLong_FromLong(dow); +} + +/* Pickle support, a simple use of __reduce__. */ + +/* __getstate__ isn't exposed */ +static PyObject * +date_getstate(PyDateTime_Date *self) +{ + PyObject* field; + field = PyBytes_FromStringAndSize((char*)self->data, + _PyDateTime_DATE_DATASIZE); + return Py_BuildValue("(N)", field); +} + +static PyObject * +date_reduce(PyDateTime_Date *self, PyObject *arg) +{ + return Py_BuildValue("(ON)", Py_TYPE(self), date_getstate(self)); +} + +static PyMethodDef date_methods[] = { + + /* Class methods: */ + + {"fromtimestamp", (PyCFunction)date_fromtimestamp, METH_VARARGS | + METH_CLASS, + PyDoc_STR("timestamp -> local date from a POSIX timestamp (like " + "time.time()).")}, + + {"fromordinal", (PyCFunction)date_fromordinal, METH_VARARGS | + METH_CLASS, + PyDoc_STR("int -> date corresponding to a proleptic Gregorian " + "ordinal.")}, + + {"today", (PyCFunction)date_today, METH_NOARGS | METH_CLASS, + PyDoc_STR("Current date or datetime: same as " + "self.__class__.fromtimestamp(time.time()).")}, + + /* Instance methods: */ + + {"ctime", (PyCFunction)date_ctime, METH_NOARGS, + PyDoc_STR("Return ctime() style string.")}, + + {"strftime", (PyCFunction)date_strftime, METH_VARARGS | METH_KEYWORDS, + PyDoc_STR("format -> strftime() style string.")}, + + {"__format__", (PyCFunction)date_format, METH_VARARGS, + PyDoc_STR("Formats self with strftime.")}, + + {"timetuple", (PyCFunction)date_timetuple, METH_NOARGS, + PyDoc_STR("Return time tuple, compatible with time.localtime().")}, + + {"isocalendar", (PyCFunction)date_isocalendar, METH_NOARGS, + PyDoc_STR("Return a 3-tuple containing ISO year, week number, and " + "weekday.")}, + + {"isoformat", (PyCFunction)date_isoformat, METH_NOARGS, + PyDoc_STR("Return string in ISO 8601 format, YYYY-MM-DD.")}, + + {"isoweekday", (PyCFunction)date_isoweekday, METH_NOARGS, + PyDoc_STR("Return the day of the week represented by the date.\n" + "Monday == 1 ... Sunday == 7")}, + + {"toordinal", (PyCFunction)date_toordinal, METH_NOARGS, + PyDoc_STR("Return proleptic Gregorian ordinal. January 1 of year " + "1 is day 1.")}, + + {"weekday", (PyCFunction)date_weekday, METH_NOARGS, + PyDoc_STR("Return the day of the week represented by the date.\n" + "Monday == 0 ... Sunday == 6")}, + + {"replace", (PyCFunction)date_replace, METH_VARARGS | METH_KEYWORDS, + PyDoc_STR("Return date with new specified fields.")}, + + {"__reduce__", (PyCFunction)date_reduce, METH_NOARGS, + PyDoc_STR("__reduce__() -> (cls, state)")}, + + {NULL, NULL} +}; + +static char date_doc[] = +PyDoc_STR("date(year, month, day) --> date object"); + +static PyNumberMethods date_as_number = { + date_add, /* nb_add */ + date_subtract, /* nb_subtract */ + 0, /* nb_multiply */ + 0, /* nb_remainder */ + 0, /* nb_divmod */ + 0, /* nb_power */ + 0, /* nb_negative */ + 0, /* nb_positive */ + 0, /* nb_absolute */ + 0, /* nb_bool */ +}; + +static PyTypeObject PyDateTime_DateType = { + PyVarObject_HEAD_INIT(NULL, 0) + "datetime.date", /* tp_name */ + sizeof(PyDateTime_Date), /* tp_basicsize */ + 0, /* tp_itemsize */ + 0, /* tp_dealloc */ + 0, /* tp_print */ + 0, /* tp_getattr */ + 0, /* tp_setattr */ + 0, /* tp_reserved */ + (reprfunc)date_repr, /* tp_repr */ + &date_as_number, /* tp_as_number */ + 0, /* tp_as_sequence */ + 0, /* tp_as_mapping */ + (hashfunc)date_hash, /* tp_hash */ + 0, /* tp_call */ + (reprfunc)date_str, /* tp_str */ + PyObject_GenericGetAttr, /* tp_getattro */ + 0, /* tp_setattro */ + 0, /* tp_as_buffer */ + Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */ + date_doc, /* tp_doc */ + 0, /* tp_traverse */ + 0, /* tp_clear */ + date_richcompare, /* tp_richcompare */ + 0, /* tp_weaklistoffset */ + 0, /* tp_iter */ + 0, /* tp_iternext */ + date_methods, /* tp_methods */ + 0, /* tp_members */ + date_getset, /* tp_getset */ + 0, /* tp_base */ + 0, /* tp_dict */ + 0, /* tp_descr_get */ + 0, /* tp_descr_set */ + 0, /* tp_dictoffset */ + 0, /* tp_init */ + 0, /* tp_alloc */ + date_new, /* tp_new */ + 0, /* tp_free */ +}; + +/* + * PyDateTime_TZInfo implementation. + */ + +/* This is a pure abstract base class, so doesn't do anything beyond + * raising NotImplemented exceptions. Real tzinfo classes need + * to derive from this. This is mostly for clarity, and for efficiency in + * datetime and time constructors (their tzinfo arguments need to + * be subclasses of this tzinfo class, which is easy and quick to check). + * + * Note: For reasons having to do with pickling of subclasses, we have + * to allow tzinfo objects to be instantiated. This wasn't an issue + * in the Python implementation (__init__() could raise NotImplementedError + * there without ill effect), but doing so in the C implementation hit a + * brick wall. + */ + +static PyObject * +tzinfo_nogo(const char* methodname) +{ + PyErr_Format(PyExc_NotImplementedError, + "a tzinfo subclass must implement %s()", + methodname); + return NULL; +} + +/* Methods. A subclass must implement these. */ + +static PyObject * +tzinfo_tzname(PyDateTime_TZInfo *self, PyObject *dt) +{ + return tzinfo_nogo("tzname"); +} + +static PyObject * +tzinfo_utcoffset(PyDateTime_TZInfo *self, PyObject *dt) +{ + return tzinfo_nogo("utcoffset"); +} + +static PyObject * +tzinfo_dst(PyDateTime_TZInfo *self, PyObject *dt) +{ + return tzinfo_nogo("dst"); +} + + +static PyObject *add_datetime_timedelta(PyDateTime_DateTime *date, + PyDateTime_Delta *delta, + int factor); +static PyObject *datetime_utcoffset(PyObject *self, PyObject *); +static PyObject *datetime_dst(PyObject *self, PyObject *); + +static PyObject * +tzinfo_fromutc(PyDateTime_TZInfo *self, PyObject *dt) +{ + PyObject *result = NULL; + PyObject *off = NULL, *dst = NULL; + PyDateTime_Delta *delta = NULL; + + if (!PyDateTime_Check(dt)) { + PyErr_SetString(PyExc_TypeError, + "fromutc: argument must be a datetime"); + return NULL; + } + if (GET_DT_TZINFO(dt) != (PyObject *)self) { + PyErr_SetString(PyExc_ValueError, "fromutc: dt.tzinfo " + "is not self"); + return NULL; + } + + off = datetime_utcoffset(dt, NULL); + if (off == NULL) + return NULL; + if (off == Py_None) { + PyErr_SetString(PyExc_ValueError, "fromutc: non-None " + "utcoffset() result required"); + goto Fail; + } + + dst = datetime_dst(dt, NULL); + if (dst == NULL) + goto Fail; + if (dst == Py_None) { + PyErr_SetString(PyExc_ValueError, "fromutc: non-None " + "dst() result required"); + goto Fail; + } + + delta = (PyDateTime_Delta *)delta_subtract(off, dst); + if (delta == NULL) + goto Fail; + result = add_datetime_timedelta((PyDateTime_DateTime *)dt, delta, 1); + if (result == NULL) + goto Fail; + + Py_DECREF(dst); + dst = call_dst(GET_DT_TZINFO(dt), result); + if (dst == NULL) + goto Fail; + if (dst == Py_None) + goto Inconsistent; + if (delta_bool(delta) != 0) { + PyObject *temp = result; + result = add_datetime_timedelta((PyDateTime_DateTime *)result, + (PyDateTime_Delta *)dst, 1); + Py_DECREF(temp); + if (result == NULL) + goto Fail; + } + Py_DECREF(delta); + Py_DECREF(dst); + Py_DECREF(off); + return result; + +Inconsistent: + PyErr_SetString(PyExc_ValueError, "fromutc: tz.dst() gave" + "inconsistent results; cannot convert"); + + /* fall thru to failure */ +Fail: + Py_XDECREF(off); + Py_XDECREF(dst); + Py_XDECREF(delta); + Py_XDECREF(result); + return NULL; +} + +/* + * Pickle support. This is solely so that tzinfo subclasses can use + * pickling -- tzinfo itself is supposed to be uninstantiable. + */ + +static PyObject * +tzinfo_reduce(PyObject *self) +{ + PyObject *args, *state, *tmp; + PyObject *getinitargs, *getstate; + + tmp = PyTuple_New(0); + if (tmp == NULL) + return NULL; + + getinitargs = PyObject_GetAttrString(self, "__getinitargs__"); + if (getinitargs != NULL) { + args = PyObject_CallObject(getinitargs, tmp); + Py_DECREF(getinitargs); + if (args == NULL) { + Py_DECREF(tmp); + return NULL; + } + } + else { + PyErr_Clear(); + args = tmp; + Py_INCREF(args); + } + + getstate = PyObject_GetAttrString(self, "__getstate__"); + if (getstate != NULL) { + state = PyObject_CallObject(getstate, tmp); + Py_DECREF(getstate); + if (state == NULL) { + Py_DECREF(args); + Py_DECREF(tmp); + return NULL; + } + } + else { + PyObject **dictptr; + PyErr_Clear(); + state = Py_None; + dictptr = _PyObject_GetDictPtr(self); + if (dictptr && *dictptr && PyDict_Size(*dictptr)) + state = *dictptr; + Py_INCREF(state); + } + + Py_DECREF(tmp); + + if (state == Py_None) { + Py_DECREF(state); + return Py_BuildValue("(ON)", Py_TYPE(self), args); + } + else + return Py_BuildValue("(ONN)", Py_TYPE(self), args, state); +} + +static PyMethodDef tzinfo_methods[] = { + + {"tzname", (PyCFunction)tzinfo_tzname, METH_O, + PyDoc_STR("datetime -> string name of time zone.")}, + + {"utcoffset", (PyCFunction)tzinfo_utcoffset, METH_O, + PyDoc_STR("datetime -> timedelta showing offset from UTC, negative " + "values indicating West of UTC")}, + + {"dst", (PyCFunction)tzinfo_dst, METH_O, + PyDoc_STR("datetime -> DST offset in minutes east of UTC.")}, + + {"fromutc", (PyCFunction)tzinfo_fromutc, METH_O, + PyDoc_STR("datetime in UTC -> datetime in local time.")}, + + {"__reduce__", (PyCFunction)tzinfo_reduce, METH_NOARGS, + PyDoc_STR("-> (cls, state)")}, + + {NULL, NULL} +}; + +static char tzinfo_doc[] = +PyDoc_STR("Abstract base class for time zone info objects."); + +static PyTypeObject PyDateTime_TZInfoType = { + PyVarObject_HEAD_INIT(NULL, 0) + "datetime.tzinfo", /* tp_name */ + sizeof(PyDateTime_TZInfo), /* tp_basicsize */ + 0, /* tp_itemsize */ + 0, /* tp_dealloc */ + 0, /* tp_print */ + 0, /* tp_getattr */ + 0, /* tp_setattr */ + 0, /* tp_reserved */ + 0, /* tp_repr */ + 0, /* tp_as_number */ + 0, /* tp_as_sequence */ + 0, /* tp_as_mapping */ + 0, /* tp_hash */ + 0, /* tp_call */ + 0, /* tp_str */ + PyObject_GenericGetAttr, /* tp_getattro */ + 0, /* tp_setattro */ + 0, /* tp_as_buffer */ + Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */ + tzinfo_doc, /* tp_doc */ + 0, /* tp_traverse */ + 0, /* tp_clear */ + 0, /* tp_richcompare */ + 0, /* tp_weaklistoffset */ + 0, /* tp_iter */ + 0, /* tp_iternext */ + tzinfo_methods, /* tp_methods */ + 0, /* tp_members */ + 0, /* tp_getset */ + 0, /* tp_base */ + 0, /* tp_dict */ + 0, /* tp_descr_get */ + 0, /* tp_descr_set */ + 0, /* tp_dictoffset */ + 0, /* tp_init */ + 0, /* tp_alloc */ + PyType_GenericNew, /* tp_new */ + 0, /* tp_free */ +}; + +static char *timezone_kws[] = {"offset", "name", NULL}; + +static PyObject * +timezone_new(PyTypeObject *type, PyObject *args, PyObject *kw) +{ + PyObject *offset; + PyObject *name = NULL; + if (PyArg_ParseTupleAndKeywords(args, kw, "O!|O!:timezone", timezone_kws, + &PyDateTime_DeltaType, &offset, + &PyUnicode_Type, &name)) + return new_timezone(offset, name); + + return NULL; +} + +static void +timezone_dealloc(PyDateTime_TimeZone *self) +{ + Py_CLEAR(self->offset); + Py_CLEAR(self->name); + Py_TYPE(self)->tp_free((PyObject *)self); +} + +static PyObject * +timezone_richcompare(PyDateTime_TimeZone *self, + PyDateTime_TimeZone *other, int op) +{ + if (op != Py_EQ && op != Py_NE) { + Py_INCREF(Py_NotImplemented); + return Py_NotImplemented; + } + return delta_richcompare(self->offset, other->offset, op); +} + +static long +timezone_hash(PyDateTime_TimeZone *self) +{ + return delta_hash((PyDateTime_Delta *)self->offset); +} + +/* Check argument type passed to tzname, utcoffset, or dst methods. + Returns 0 for good argument. Returns -1 and sets exception info + otherwise. + */ +static int +_timezone_check_argument(PyObject *dt, const char *meth) +{ + if (dt == Py_None || PyDateTime_Check(dt)) + return 0; + PyErr_Format(PyExc_TypeError, "%s(dt) argument must be a datetime instance" + " or None, not %.200s", meth, Py_TYPE(dt)->tp_name); + return -1; +} + +static PyObject * +timezone_repr(PyDateTime_TimeZone *self) +{ + /* Note that although timezone is not subclassable, it is convenient + to use Py_TYPE(self)->tp_name here. */ + const char *type_name = Py_TYPE(self)->tp_name; + + if (((PyObject *)self) == PyDateTime_TimeZone_UTC) + return PyUnicode_FromFormat("%s.utc", type_name); + + if (self->name == NULL) + return PyUnicode_FromFormat("%s(%R)", type_name, self->offset); + + return PyUnicode_FromFormat("%s(%R, %R)", type_name, self->offset, + self->name); +} + + +static PyObject * +timezone_str(PyDateTime_TimeZone *self) +{ + char buf[10]; + int hours, minutes, seconds; + PyObject *offset; + char sign; + + if (self->name != NULL) { + Py_INCREF(self->name); + return self->name; + } + /* Offset is normalized, so it is negative if days < 0 */ + if (GET_TD_DAYS(self->offset) < 0) { + sign = '-'; + offset = delta_negative((PyDateTime_Delta *)self->offset); + if (offset == NULL) + return NULL; + } + else { + sign = '+'; + offset = self->offset; + Py_INCREF(offset); + } + /* Offset is not negative here. */ + seconds = GET_TD_SECONDS(offset); + Py_DECREF(offset); + minutes = divmod(seconds, 60, &seconds); + hours = divmod(minutes, 60, &minutes); + assert(seconds == 0); + /* XXX ignore sub-minute data, curently not allowed. */ + PyOS_snprintf(buf, sizeof(buf), "UTC%c%02d:%02d", sign, hours, minutes); + + return PyUnicode_FromString(buf); +} + +static PyObject * +timezone_tzname(PyDateTime_TimeZone *self, PyObject *dt) +{ + if (_timezone_check_argument(dt, "tzname") == -1) + return NULL; + + return timezone_str(self); +} + +static PyObject * +timezone_utcoffset(PyDateTime_TimeZone *self, PyObject *dt) +{ + if (_timezone_check_argument(dt, "utcoffset") == -1) + return NULL; + + Py_INCREF(self->offset); + return self->offset; +} + +static PyObject * +timezone_dst(PyObject *self, PyObject *dt) +{ + if (_timezone_check_argument(dt, "dst") == -1) + return NULL; + + Py_RETURN_NONE; +} + +static PyObject * +timezone_fromutc(PyDateTime_TimeZone *self, PyDateTime_DateTime *dt) +{ + if (!PyDateTime_Check(dt)) { + PyErr_SetString(PyExc_TypeError, + "fromutc: argument must be a datetime"); + return NULL; + } + if (!HASTZINFO(dt) || dt->tzinfo != (PyObject *)self) { + PyErr_SetString(PyExc_ValueError, "fromutc: dt.tzinfo " + "is not self"); + return NULL; + } + + return add_datetime_timedelta(dt, (PyDateTime_Delta *)self->offset, 1); +} + +static PyObject * +timezone_getinitargs(PyDateTime_TimeZone *self) +{ + if (self->name == NULL) + return Py_BuildValue("(O)", self->offset); + return Py_BuildValue("(OO)", self->offset, self->name); +} + +static PyMethodDef timezone_methods[] = { + {"tzname", (PyCFunction)timezone_tzname, METH_O, + PyDoc_STR("If name is specified when timezone is created, returns the name." + " Otherwise returns offset as 'UTC(+|-)HH:MM'.")}, + + {"utcoffset", (PyCFunction)timezone_utcoffset, METH_O, + PyDoc_STR("Return fixed offset.")}, + + {"dst", (PyCFunction)timezone_dst, METH_O, + PyDoc_STR("Return None.")}, + + {"fromutc", (PyCFunction)timezone_fromutc, METH_O, + PyDoc_STR("datetime in UTC -> datetime in local time.")}, + + {"__getinitargs__", (PyCFunction)timezone_getinitargs, METH_NOARGS, + PyDoc_STR("pickle support")}, + + {NULL, NULL} +}; + +static char timezone_doc[] = +PyDoc_STR("Fixed offset from UTC implementation of tzinfo."); + +static PyTypeObject PyDateTime_TimeZoneType = { + PyVarObject_HEAD_INIT(NULL, 0) + "datetime.timezone", /* tp_name */ + sizeof(PyDateTime_TimeZone), /* tp_basicsize */ + 0, /* tp_itemsize */ + (destructor)timezone_dealloc, /* tp_dealloc */ + 0, /* tp_print */ + 0, /* tp_getattr */ + 0, /* tp_setattr */ + 0, /* tp_reserved */ + (reprfunc)timezone_repr, /* tp_repr */ + 0, /* tp_as_number */ + 0, /* tp_as_sequence */ + 0, /* tp_as_mapping */ + (hashfunc)timezone_hash, /* tp_hash */ + 0, /* tp_call */ + (reprfunc)timezone_str, /* tp_str */ + 0, /* tp_getattro */ + 0, /* tp_setattro */ + 0, /* tp_as_buffer */ + Py_TPFLAGS_DEFAULT, /* tp_flags */ + timezone_doc, /* tp_doc */ + 0, /* tp_traverse */ + 0, /* tp_clear */ + (richcmpfunc)timezone_richcompare,/* tp_richcompare */ + 0, /* tp_weaklistoffset */ + 0, /* tp_iter */ + 0, /* tp_iternext */ + timezone_methods, /* tp_methods */ + 0, /* tp_members */ + 0, /* tp_getset */ + &PyDateTime_TZInfoType, /* tp_base */ + 0, /* tp_dict */ + 0, /* tp_descr_get */ + 0, /* tp_descr_set */ + 0, /* tp_dictoffset */ + 0, /* tp_init */ + 0, /* tp_alloc */ + timezone_new, /* tp_new */ +}; + +/* + * PyDateTime_Time implementation. + */ + +/* Accessor properties. + */ + +static PyObject * +time_hour(PyDateTime_Time *self, void *unused) +{ + return PyLong_FromLong(TIME_GET_HOUR(self)); +} + +static PyObject * +time_minute(PyDateTime_Time *self, void *unused) +{ + return PyLong_FromLong(TIME_GET_MINUTE(self)); +} + +/* The name time_second conflicted with some platform header file. */ +static PyObject * +py_time_second(PyDateTime_Time *self, void *unused) +{ + return PyLong_FromLong(TIME_GET_SECOND(self)); +} + +static PyObject * +time_microsecond(PyDateTime_Time *self, void *unused) +{ + return PyLong_FromLong(TIME_GET_MICROSECOND(self)); +} + +static PyObject * +time_tzinfo(PyDateTime_Time *self, void *unused) +{ + PyObject *result = HASTZINFO(self) ? self->tzinfo : Py_None; + Py_INCREF(result); + return result; +} + +static PyGetSetDef time_getset[] = { + {"hour", (getter)time_hour}, + {"minute", (getter)time_minute}, + {"second", (getter)py_time_second}, + {"microsecond", (getter)time_microsecond}, + {"tzinfo", (getter)time_tzinfo}, + {NULL} +}; + +/* + * Constructors. + */ + +static char *time_kws[] = {"hour", "minute", "second", "microsecond", + "tzinfo", NULL}; + +static PyObject * +time_new(PyTypeObject *type, PyObject *args, PyObject *kw) +{ + PyObject *self = NULL; + PyObject *state; + int hour = 0; + int minute = 0; + int second = 0; + int usecond = 0; + PyObject *tzinfo = Py_None; + + /* Check for invocation from pickle with __getstate__ state */ + if (PyTuple_GET_SIZE(args) >= 1 && + PyTuple_GET_SIZE(args) <= 2 && + PyBytes_Check(state = PyTuple_GET_ITEM(args, 0)) && + PyBytes_GET_SIZE(state) == _PyDateTime_TIME_DATASIZE && + ((unsigned char) (PyBytes_AS_STRING(state)[0])) < 24) + { + PyDateTime_Time *me; + char aware; + + if (PyTuple_GET_SIZE(args) == 2) { + tzinfo = PyTuple_GET_ITEM(args, 1); + if (check_tzinfo_subclass(tzinfo) < 0) { + PyErr_SetString(PyExc_TypeError, "bad " + "tzinfo state arg"); + return NULL; + } + } + aware = (char)(tzinfo != Py_None); + me = (PyDateTime_Time *) (type->tp_alloc(type, aware)); + if (me != NULL) { + char *pdata = PyBytes_AS_STRING(state); + + memcpy(me->data, pdata, _PyDateTime_TIME_DATASIZE); + me->hashcode = -1; + me->hastzinfo = aware; + if (aware) { + Py_INCREF(tzinfo); + me->tzinfo = tzinfo; + } + } + return (PyObject *)me; + } + + if (PyArg_ParseTupleAndKeywords(args, kw, "|iiiiO", time_kws, + &hour, &minute, &second, &usecond, + &tzinfo)) { + if (check_time_args(hour, minute, second, usecond) < 0) + return NULL; + if (check_tzinfo_subclass(tzinfo) < 0) + return NULL; + self = new_time_ex(hour, minute, second, usecond, tzinfo, + type); + } + return self; +} + +/* + * Destructor. + */ + +static void +time_dealloc(PyDateTime_Time *self) +{ + if (HASTZINFO(self)) { + Py_XDECREF(self->tzinfo); + } + Py_TYPE(self)->tp_free((PyObject *)self); +} + +/* + * Indirect access to tzinfo methods. + */ + +/* These are all METH_NOARGS, so don't need to check the arglist. */ +static PyObject * +time_utcoffset(PyObject *self, PyObject *unused) { + return call_utcoffset(GET_TIME_TZINFO(self), Py_None); +} + +static PyObject * +time_dst(PyObject *self, PyObject *unused) { + return call_dst(GET_TIME_TZINFO(self), Py_None); +} + +static PyObject * +time_tzname(PyDateTime_Time *self, PyObject *unused) { + return call_tzname(GET_TIME_TZINFO(self), Py_None); +} + +/* + * Various ways to turn a time into a string. + */ + +static PyObject * +time_repr(PyDateTime_Time *self) +{ + const char *type_name = Py_TYPE(self)->tp_name; + int h = TIME_GET_HOUR(self); + int m = TIME_GET_MINUTE(self); + int s = TIME_GET_SECOND(self); + int us = TIME_GET_MICROSECOND(self); + PyObject *result = NULL; + + if (us) + result = PyUnicode_FromFormat("%s(%d, %d, %d, %d)", + type_name, h, m, s, us); + else if (s) + result = PyUnicode_FromFormat("%s(%d, %d, %d)", + type_name, h, m, s); + else + result = PyUnicode_FromFormat("%s(%d, %d)", type_name, h, m); + if (result != NULL && HASTZINFO(self)) + result = append_keyword_tzinfo(result, self->tzinfo); + return result; +} + +static PyObject * +time_str(PyDateTime_Time *self) +{ + return PyObject_CallMethod((PyObject *)self, "isoformat", "()"); +} + +static PyObject * +time_isoformat(PyDateTime_Time *self, PyObject *unused) +{ + char buf[100]; + PyObject *result; + int us = TIME_GET_MICROSECOND(self);; + + if (us) + result = PyUnicode_FromFormat("%02d:%02d:%02d.%06d", + TIME_GET_HOUR(self), + TIME_GET_MINUTE(self), + TIME_GET_SECOND(self), + us); + else + result = PyUnicode_FromFormat("%02d:%02d:%02d", + TIME_GET_HOUR(self), + TIME_GET_MINUTE(self), + TIME_GET_SECOND(self)); + + if (result == NULL || !HASTZINFO(self) || self->tzinfo == Py_None) + return result; + + /* We need to append the UTC offset. */ + if (format_utcoffset(buf, sizeof(buf), ":", self->tzinfo, + Py_None) < 0) { + Py_DECREF(result); + return NULL; + } + PyUnicode_AppendAndDel(&result, PyUnicode_FromString(buf)); + return result; +} + +static PyObject * +time_strftime(PyDateTime_Time *self, PyObject *args, PyObject *kw) +{ + PyObject *result; + PyObject *tuple; + PyObject *format; + static char *keywords[] = {"format", NULL}; + + if (! PyArg_ParseTupleAndKeywords(args, kw, "U:strftime", keywords, + &format)) + return NULL; + + /* Python's strftime does insane things with the year part of the + * timetuple. The year is forced to (the otherwise nonsensical) + * 1900 to worm around that. + */ + tuple = Py_BuildValue("iiiiiiiii", + 1900, 1, 1, /* year, month, day */ + TIME_GET_HOUR(self), + TIME_GET_MINUTE(self), + TIME_GET_SECOND(self), + 0, 1, -1); /* weekday, daynum, dst */ + if (tuple == NULL) + return NULL; + assert(PyTuple_Size(tuple) == 9); + result = wrap_strftime((PyObject *)self, format, tuple, + Py_None); + Py_DECREF(tuple); + return result; +} + +/* + * Miscellaneous methods. + */ + +static PyObject * +time_richcompare(PyObject *self, PyObject *other, int op) +{ + PyObject *result = NULL; + PyObject *offset1, *offset2; + int diff; + + if (! PyTime_Check(other)) { + Py_INCREF(Py_NotImplemented); + return Py_NotImplemented; + } + + if (GET_TIME_TZINFO(self) == GET_TIME_TZINFO(other)) { + diff = memcmp(((PyDateTime_Time *)self)->data, + ((PyDateTime_Time *)other)->data, + _PyDateTime_TIME_DATASIZE); + return diff_to_bool(diff, op); + } + offset1 = time_utcoffset(self, NULL); + if (offset1 == NULL) + return NULL; + offset2 = time_utcoffset(other, NULL); + if (offset2 == NULL) + goto done; + /* If they're both naive, or both aware and have the same offsets, + * we get off cheap. Note that if they're both naive, offset1 == + * offset2 == Py_None at this point. + */ + if ((offset1 == offset2) || + (PyDelta_Check(offset1) && PyDelta_Check(offset2) && + delta_cmp(offset1, offset2) == 0)) { + diff = memcmp(((PyDateTime_Time *)self)->data, + ((PyDateTime_Time *)other)->data, + _PyDateTime_TIME_DATASIZE); + result = diff_to_bool(diff, op); + } + /* The hard case: both aware with different UTC offsets */ + else if (offset1 != Py_None && offset2 != Py_None) { + int offsecs1, offsecs2; + assert(offset1 != offset2); /* else last "if" handled it */ + offsecs1 = TIME_GET_HOUR(self) * 3600 + + TIME_GET_MINUTE(self) * 60 + + TIME_GET_SECOND(self) - + GET_TD_DAYS(offset1) * 86400 - + GET_TD_SECONDS(offset1); + offsecs2 = TIME_GET_HOUR(other) * 3600 + + TIME_GET_MINUTE(other) * 60 + + TIME_GET_SECOND(other) - + GET_TD_DAYS(offset2) * 86400 - + GET_TD_SECONDS(offset2); + diff = offsecs1 - offsecs2; + if (diff == 0) + diff = TIME_GET_MICROSECOND(self) - + TIME_GET_MICROSECOND(other); + result = diff_to_bool(diff, op); + } + else { + PyErr_SetString(PyExc_TypeError, + "can't compare offset-naive and " + "offset-aware times"); + } + done: + Py_DECREF(offset1); + Py_XDECREF(offset2); + return result; +} + +static long +time_hash(PyDateTime_Time *self) +{ + if (self->hashcode == -1) { + PyObject *offset; + + offset = time_utcoffset((PyObject *)self, NULL); + + if (offset == NULL) + return -1; + + /* Reduce this to a hash of another object. */ + if (offset == Py_None) + self->hashcode = generic_hash( + (unsigned char *)self->data, _PyDateTime_TIME_DATASIZE); + else { + PyObject *temp1, *temp2; + int seconds, microseconds; + assert(HASTZINFO(self)); + seconds = TIME_GET_HOUR(self) * 3600 + + TIME_GET_MINUTE(self) * 60 + + TIME_GET_SECOND(self); + microseconds = TIME_GET_MICROSECOND(self); + temp1 = new_delta(0, seconds, microseconds, 1); + if (temp1 == NULL) { + Py_DECREF(offset); + return -1; + } + temp2 = delta_subtract(temp1, offset); + Py_DECREF(temp1); + if (temp2 == NULL) { + Py_DECREF(offset); + return -1; + } + self->hashcode = PyObject_Hash(temp2); + Py_DECREF(temp2); + } + Py_DECREF(offset); + } + return self->hashcode; +} + +static PyObject * +time_replace(PyDateTime_Time *self, PyObject *args, PyObject *kw) +{ + PyObject *clone; + PyObject *tuple; + int hh = TIME_GET_HOUR(self); + int mm = TIME_GET_MINUTE(self); + int ss = TIME_GET_SECOND(self); + int us = TIME_GET_MICROSECOND(self); + PyObject *tzinfo = HASTZINFO(self) ? self->tzinfo : Py_None; + + if (! PyArg_ParseTupleAndKeywords(args, kw, "|iiiiO:replace", + time_kws, + &hh, &mm, &ss, &us, &tzinfo)) + return NULL; + tuple = Py_BuildValue("iiiiO", hh, mm, ss, us, tzinfo); + if (tuple == NULL) + return NULL; + clone = time_new(Py_TYPE(self), tuple, NULL); + Py_DECREF(tuple); + return clone; +} + +static int +time_bool(PyObject *self) +{ + PyObject *offset, *tzinfo; + int offsecs = 0; + + if (TIME_GET_SECOND(self) || TIME_GET_MICROSECOND(self)) { + /* Since utcoffset is in whole minutes, nothing can + * alter the conclusion that this is nonzero. + */ + return 1; + } + tzinfo = GET_TIME_TZINFO(self); + if (tzinfo != Py_None) { + offset = call_utcoffset(tzinfo, Py_None); + if (offset == NULL) + return -1; + offsecs = GET_TD_DAYS(offset)*86400 + GET_TD_SECONDS(offset); + Py_DECREF(offset); + } + return (TIME_GET_MINUTE(self)*60 - offsecs + TIME_GET_HOUR(self)*3600) != 0; +} + +/* Pickle support, a simple use of __reduce__. */ + +/* Let basestate be the non-tzinfo data string. + * If tzinfo is None, this returns (basestate,), else (basestate, tzinfo). + * So it's a tuple in any (non-error) case. + * __getstate__ isn't exposed. + */ +static PyObject * +time_getstate(PyDateTime_Time *self) +{ + PyObject *basestate; + PyObject *result = NULL; + + basestate = PyBytes_FromStringAndSize((char *)self->data, + _PyDateTime_TIME_DATASIZE); + if (basestate != NULL) { + if (! HASTZINFO(self) || self->tzinfo == Py_None) + result = PyTuple_Pack(1, basestate); + else + result = PyTuple_Pack(2, basestate, self->tzinfo); + Py_DECREF(basestate); + } + return result; +} + +static PyObject * +time_reduce(PyDateTime_Time *self, PyObject *arg) +{ + return Py_BuildValue("(ON)", Py_TYPE(self), time_getstate(self)); +} + +static PyMethodDef time_methods[] = { + + {"isoformat", (PyCFunction)time_isoformat, METH_NOARGS, + PyDoc_STR("Return string in ISO 8601 format, HH:MM:SS[.mmmmmm]" + "[+HH:MM].")}, + + {"strftime", (PyCFunction)time_strftime, METH_VARARGS | METH_KEYWORDS, + PyDoc_STR("format -> strftime() style string.")}, + + {"__format__", (PyCFunction)date_format, METH_VARARGS, + PyDoc_STR("Formats self with strftime.")}, + + {"utcoffset", (PyCFunction)time_utcoffset, METH_NOARGS, + PyDoc_STR("Return self.tzinfo.utcoffset(self).")}, + + {"tzname", (PyCFunction)time_tzname, METH_NOARGS, + PyDoc_STR("Return self.tzinfo.tzname(self).")}, + + {"dst", (PyCFunction)time_dst, METH_NOARGS, + PyDoc_STR("Return self.tzinfo.dst(self).")}, + + {"replace", (PyCFunction)time_replace, METH_VARARGS | METH_KEYWORDS, + PyDoc_STR("Return time with new specified fields.")}, + + {"__reduce__", (PyCFunction)time_reduce, METH_NOARGS, + PyDoc_STR("__reduce__() -> (cls, state)")}, + + {NULL, NULL} +}; + +static char time_doc[] = +PyDoc_STR("time([hour[, minute[, second[, microsecond[, tzinfo]]]]]) --> a time object\n\ +\n\ +All arguments are optional. tzinfo may be None, or an instance of\n\ +a tzinfo subclass. The remaining arguments may be ints or longs.\n"); + +static PyNumberMethods time_as_number = { + 0, /* nb_add */ + 0, /* nb_subtract */ + 0, /* nb_multiply */ + 0, /* nb_remainder */ + 0, /* nb_divmod */ + 0, /* nb_power */ + 0, /* nb_negative */ + 0, /* nb_positive */ + 0, /* nb_absolute */ + (inquiry)time_bool, /* nb_bool */ +}; + +static PyTypeObject PyDateTime_TimeType = { + PyVarObject_HEAD_INIT(NULL, 0) + "datetime.time", /* tp_name */ + sizeof(PyDateTime_Time), /* tp_basicsize */ + 0, /* tp_itemsize */ + (destructor)time_dealloc, /* tp_dealloc */ + 0, /* tp_print */ + 0, /* tp_getattr */ + 0, /* tp_setattr */ + 0, /* tp_reserved */ + (reprfunc)time_repr, /* tp_repr */ + &time_as_number, /* tp_as_number */ + 0, /* tp_as_sequence */ + 0, /* tp_as_mapping */ + (hashfunc)time_hash, /* tp_hash */ + 0, /* tp_call */ + (reprfunc)time_str, /* tp_str */ + PyObject_GenericGetAttr, /* tp_getattro */ + 0, /* tp_setattro */ + 0, /* tp_as_buffer */ + Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */ + time_doc, /* tp_doc */ + 0, /* tp_traverse */ + 0, /* tp_clear */ + time_richcompare, /* tp_richcompare */ + 0, /* tp_weaklistoffset */ + 0, /* tp_iter */ + 0, /* tp_iternext */ + time_methods, /* tp_methods */ + 0, /* tp_members */ + time_getset, /* tp_getset */ + 0, /* tp_base */ + 0, /* tp_dict */ + 0, /* tp_descr_get */ + 0, /* tp_descr_set */ + 0, /* tp_dictoffset */ + 0, /* tp_init */ + time_alloc, /* tp_alloc */ + time_new, /* tp_new */ + 0, /* tp_free */ +}; + +/* + * PyDateTime_DateTime implementation. + */ + +/* Accessor properties. Properties for day, month, and year are inherited + * from date. + */ + +static PyObject * +datetime_hour(PyDateTime_DateTime *self, void *unused) +{ + return PyLong_FromLong(DATE_GET_HOUR(self)); +} + +static PyObject * +datetime_minute(PyDateTime_DateTime *self, void *unused) +{ + return PyLong_FromLong(DATE_GET_MINUTE(self)); +} + +static PyObject * +datetime_second(PyDateTime_DateTime *self, void *unused) +{ + return PyLong_FromLong(DATE_GET_SECOND(self)); +} + +static PyObject * +datetime_microsecond(PyDateTime_DateTime *self, void *unused) +{ + return PyLong_FromLong(DATE_GET_MICROSECOND(self)); +} + +static PyObject * +datetime_tzinfo(PyDateTime_DateTime *self, void *unused) +{ + PyObject *result = HASTZINFO(self) ? self->tzinfo : Py_None; + Py_INCREF(result); + return result; +} + +static PyGetSetDef datetime_getset[] = { + {"hour", (getter)datetime_hour}, + {"minute", (getter)datetime_minute}, + {"second", (getter)datetime_second}, + {"microsecond", (getter)datetime_microsecond}, + {"tzinfo", (getter)datetime_tzinfo}, + {NULL} +}; + +/* + * Constructors. + */ + +static char *datetime_kws[] = { + "year", "month", "day", "hour", "minute", "second", + "microsecond", "tzinfo", NULL +}; + +static PyObject * +datetime_new(PyTypeObject *type, PyObject *args, PyObject *kw) +{ + PyObject *self = NULL; + PyObject *state; + int year; + int month; + int day; + int hour = 0; + int minute = 0; + int second = 0; + int usecond = 0; + PyObject *tzinfo = Py_None; + + /* Check for invocation from pickle with __getstate__ state */ + if (PyTuple_GET_SIZE(args) >= 1 && + PyTuple_GET_SIZE(args) <= 2 && + PyBytes_Check(state = PyTuple_GET_ITEM(args, 0)) && + PyBytes_GET_SIZE(state) == _PyDateTime_DATETIME_DATASIZE && + MONTH_IS_SANE(PyBytes_AS_STRING(state)[2])) + { + PyDateTime_DateTime *me; + char aware; + + if (PyTuple_GET_SIZE(args) == 2) { + tzinfo = PyTuple_GET_ITEM(args, 1); + if (check_tzinfo_subclass(tzinfo) < 0) { + PyErr_SetString(PyExc_TypeError, "bad " + "tzinfo state arg"); + return NULL; + } + } + aware = (char)(tzinfo != Py_None); + me = (PyDateTime_DateTime *) (type->tp_alloc(type , aware)); + if (me != NULL) { + char *pdata = PyBytes_AS_STRING(state); + + memcpy(me->data, pdata, _PyDateTime_DATETIME_DATASIZE); + me->hashcode = -1; + me->hastzinfo = aware; + if (aware) { + Py_INCREF(tzinfo); + me->tzinfo = tzinfo; + } + } + return (PyObject *)me; + } + + if (PyArg_ParseTupleAndKeywords(args, kw, "iii|iiiiO", datetime_kws, + &year, &month, &day, &hour, &minute, + &second, &usecond, &tzinfo)) { + if (check_date_args(year, month, day) < 0) + return NULL; + if (check_time_args(hour, minute, second, usecond) < 0) + return NULL; + if (check_tzinfo_subclass(tzinfo) < 0) + return NULL; + self = new_datetime_ex(year, month, day, + hour, minute, second, usecond, + tzinfo, type); + } + return self; +} + +/* TM_FUNC is the shared type of localtime() and gmtime(). */ +typedef struct tm *(*TM_FUNC)(const time_t *timer); + +/* Internal helper. + * Build datetime from a time_t and a distinct count of microseconds. + * Pass localtime or gmtime for f, to control the interpretation of timet. + */ +static PyObject * +datetime_from_timet_and_us(PyObject *cls, TM_FUNC f, time_t timet, int us, + PyObject *tzinfo) +{ + struct tm *tm; + PyObject *result = NULL; + + tm = f(&timet); + if (tm) { + /* The platform localtime/gmtime may insert leap seconds, + * indicated by tm->tm_sec > 59. We don't care about them, + * except to the extent that passing them on to the datetime + * constructor would raise ValueError for a reason that + * made no sense to the user. + */ + if (tm->tm_sec > 59) + tm->tm_sec = 59; + result = PyObject_CallFunction(cls, "iiiiiiiO", + tm->tm_year + 1900, + tm->tm_mon + 1, + tm->tm_mday, + tm->tm_hour, + tm->tm_min, + tm->tm_sec, + us, + tzinfo); + } + else + PyErr_SetString(PyExc_ValueError, + "timestamp out of range for " + "platform localtime()/gmtime() function"); + return result; +} + +/* Internal helper. + * Build datetime from a Python timestamp. Pass localtime or gmtime for f, + * to control the interpretation of the timestamp. Since a double doesn't + * have enough bits to cover a datetime's full range of precision, it's + * better to call datetime_from_timet_and_us provided you have a way + * to get that much precision (e.g., C time() isn't good enough). + */ +static PyObject * +datetime_from_timestamp(PyObject *cls, TM_FUNC f, double timestamp, + PyObject *tzinfo) +{ + time_t timet; + double fraction; + int us; + + timet = _PyTime_DoubleToTimet(timestamp); + if (timet == (time_t)-1 && PyErr_Occurred()) + return NULL; + fraction = timestamp - (double)timet; + us = (int)round_to_long(fraction * 1e6); + if (us < 0) { + /* Truncation towards zero is not what we wanted + for negative numbers (Python's mod semantics) */ + timet -= 1; + us += 1000000; + } + /* If timestamp is less than one microsecond smaller than a + * full second, round up. Otherwise, ValueErrors are raised + * for some floats. */ + if (us == 1000000) { + timet += 1; + us = 0; + } + return datetime_from_timet_and_us(cls, f, timet, us, tzinfo); +} + +/* Internal helper. + * Build most accurate possible datetime for current time. Pass localtime or + * gmtime for f as appropriate. + */ +static PyObject * +datetime_best_possible(PyObject *cls, TM_FUNC f, PyObject *tzinfo) +{ +#ifdef HAVE_GETTIMEOFDAY + struct timeval t; + +#ifdef GETTIMEOFDAY_NO_TZ + gettimeofday(&t); +#else + gettimeofday(&t, (struct timezone *)NULL); +#endif + return datetime_from_timet_and_us(cls, f, t.tv_sec, (int)t.tv_usec, + tzinfo); + +#else /* ! HAVE_GETTIMEOFDAY */ + /* No flavor of gettimeofday exists on this platform. Python's + * time.time() does a lot of other platform tricks to get the + * best time it can on the platform, and we're not going to do + * better than that (if we could, the better code would belong + * in time.time()!) We're limited by the precision of a double, + * though. + */ + PyObject *time; + double dtime; + + time = time_time(); + if (time == NULL) + return NULL; + dtime = PyFloat_AsDouble(time); + Py_DECREF(time); + if (dtime == -1.0 && PyErr_Occurred()) + return NULL; + return datetime_from_timestamp(cls, f, dtime, tzinfo); +#endif /* ! HAVE_GETTIMEOFDAY */ +} + +/* Return best possible local time -- this isn't constrained by the + * precision of a timestamp. + */ +static PyObject * +datetime_now(PyObject *cls, PyObject *args, PyObject *kw) +{ + PyObject *self; + PyObject *tzinfo = Py_None; + static char *keywords[] = {"tz", NULL}; + + if (! PyArg_ParseTupleAndKeywords(args, kw, "|O:now", keywords, + &tzinfo)) + return NULL; + if (check_tzinfo_subclass(tzinfo) < 0) + return NULL; + + self = datetime_best_possible(cls, + tzinfo == Py_None ? localtime : gmtime, + tzinfo); + if (self != NULL && tzinfo != Py_None) { + /* Convert UTC to tzinfo's zone. */ + PyObject *temp = self; + self = PyObject_CallMethod(tzinfo, "fromutc", "O", self); + Py_DECREF(temp); + } + return self; +} + +/* Return best possible UTC time -- this isn't constrained by the + * precision of a timestamp. + */ +static PyObject * +datetime_utcnow(PyObject *cls, PyObject *dummy) +{ + return datetime_best_possible(cls, gmtime, Py_None); +} + +/* Return new local datetime from timestamp (Python timestamp -- a double). */ +static PyObject * +datetime_fromtimestamp(PyObject *cls, PyObject *args, PyObject *kw) +{ + PyObject *self; + double timestamp; + PyObject *tzinfo = Py_None; + static char *keywords[] = {"timestamp", "tz", NULL}; + + if (! PyArg_ParseTupleAndKeywords(args, kw, "d|O:fromtimestamp", + keywords, ×tamp, &tzinfo)) + return NULL; + if (check_tzinfo_subclass(tzinfo) < 0) + return NULL; + + self = datetime_from_timestamp(cls, + tzinfo == Py_None ? localtime : gmtime, + timestamp, + tzinfo); + if (self != NULL && tzinfo != Py_None) { + /* Convert UTC to tzinfo's zone. */ + PyObject *temp = self; + self = PyObject_CallMethod(tzinfo, "fromutc", "O", self); + Py_DECREF(temp); + } + return self; +} + +/* Return new UTC datetime from timestamp (Python timestamp -- a double). */ +static PyObject * +datetime_utcfromtimestamp(PyObject *cls, PyObject *args) +{ + double timestamp; + PyObject *result = NULL; + + if (PyArg_ParseTuple(args, "d:utcfromtimestamp", ×tamp)) + result = datetime_from_timestamp(cls, gmtime, timestamp, + Py_None); + return result; +} + +/* Return new datetime from _strptime.strptime_datetime(). */ +static PyObject * +datetime_strptime(PyObject *cls, PyObject *args) +{ + static PyObject *module = NULL; + const Py_UNICODE *string, *format; + + if (!PyArg_ParseTuple(args, "uu:strptime", &string, &format)) + return NULL; + + if (module == NULL) { + module = PyImport_ImportModuleNoBlock("_strptime"); + if (module == NULL) + return NULL; + } + return PyObject_CallMethod(module, "_strptime_datetime", "Ouu", + cls, string, format); +} + +/* Return new datetime from date/datetime and time arguments. */ +static PyObject * +datetime_combine(PyObject *cls, PyObject *args, PyObject *kw) +{ + static char *keywords[] = {"date", "time", NULL}; + PyObject *date; + PyObject *time; + PyObject *result = NULL; + + if (PyArg_ParseTupleAndKeywords(args, kw, "O!O!:combine", keywords, + &PyDateTime_DateType, &date, + &PyDateTime_TimeType, &time)) { + PyObject *tzinfo = Py_None; + + if (HASTZINFO(time)) + tzinfo = ((PyDateTime_Time *)time)->tzinfo; + result = PyObject_CallFunction(cls, "iiiiiiiO", + GET_YEAR(date), + GET_MONTH(date), + GET_DAY(date), + TIME_GET_HOUR(time), + TIME_GET_MINUTE(time), + TIME_GET_SECOND(time), + TIME_GET_MICROSECOND(time), + tzinfo); + } + return result; +} + +/* + * Destructor. + */ + +static void +datetime_dealloc(PyDateTime_DateTime *self) +{ + if (HASTZINFO(self)) { + Py_XDECREF(self->tzinfo); + } + Py_TYPE(self)->tp_free((PyObject *)self); +} + +/* + * Indirect access to tzinfo methods. + */ + +/* These are all METH_NOARGS, so don't need to check the arglist. */ +static PyObject * +datetime_utcoffset(PyObject *self, PyObject *unused) { + return call_utcoffset(GET_DT_TZINFO(self), self); +} + +static PyObject * +datetime_dst(PyObject *self, PyObject *unused) { + return call_dst(GET_DT_TZINFO(self), self); +} + +static PyObject * +datetime_tzname(PyObject *self, PyObject *unused) { + return call_tzname(GET_DT_TZINFO(self), self); +} + +/* + * datetime arithmetic. + */ + +/* factor must be 1 (to add) or -1 (to subtract). The result inherits + * the tzinfo state of date. + */ +static PyObject * +add_datetime_timedelta(PyDateTime_DateTime *date, PyDateTime_Delta *delta, + int factor) +{ + /* Note that the C-level additions can't overflow, because of + * invariant bounds on the member values. + */ + int year = GET_YEAR(date); + int month = GET_MONTH(date); + int day = GET_DAY(date) + GET_TD_DAYS(delta) * factor; + int hour = DATE_GET_HOUR(date); + int minute = DATE_GET_MINUTE(date); + int second = DATE_GET_SECOND(date) + GET_TD_SECONDS(delta) * factor; + int microsecond = DATE_GET_MICROSECOND(date) + + GET_TD_MICROSECONDS(delta) * factor; + + assert(factor == 1 || factor == -1); + if (normalize_datetime(&year, &month, &day, + &hour, &minute, &second, µsecond) < 0) + return NULL; + else + return new_datetime(year, month, day, + hour, minute, second, microsecond, + HASTZINFO(date) ? date->tzinfo : Py_None); +} + +static PyObject * +datetime_add(PyObject *left, PyObject *right) +{ + if (PyDateTime_Check(left)) { + /* datetime + ??? */ + if (PyDelta_Check(right)) + /* datetime + delta */ + return add_datetime_timedelta( + (PyDateTime_DateTime *)left, + (PyDateTime_Delta *)right, + 1); + } + else if (PyDelta_Check(left)) { + /* delta + datetime */ + return add_datetime_timedelta((PyDateTime_DateTime *) right, + (PyDateTime_Delta *) left, + 1); + } + Py_INCREF(Py_NotImplemented); + return Py_NotImplemented; +} + +static PyObject * +datetime_subtract(PyObject *left, PyObject *right) +{ + PyObject *result = Py_NotImplemented; + + if (PyDateTime_Check(left)) { + /* datetime - ??? */ + if (PyDateTime_Check(right)) { + /* datetime - datetime */ + PyObject *offset1, *offset2, *offdiff = NULL; + int delta_d, delta_s, delta_us; + + if (GET_DT_TZINFO(left) == GET_DT_TZINFO(right)) { + offset2 = offset1 = Py_None; + Py_INCREF(offset1); + Py_INCREF(offset2); + } + else { + offset1 = datetime_utcoffset(left, NULL); + if (offset1 == NULL) + return NULL; + offset2 = datetime_utcoffset(right, NULL); + if (offset2 == NULL) { + Py_DECREF(offset1); + return NULL; + } + if ((offset1 != Py_None) != (offset2 != Py_None)) { + PyErr_SetString(PyExc_TypeError, + "can't subtract offset-naive and " + "offset-aware datetimes"); + Py_DECREF(offset1); + Py_DECREF(offset2); + return NULL; + } + } + if ((offset1 != offset2) && + delta_cmp(offset1, offset2) != 0) { + offdiff = delta_subtract(offset1, offset2); + if (offdiff == NULL) { + Py_DECREF(offset1); + Py_DECREF(offset2); + return NULL; + } + } + Py_DECREF(offset1); + Py_DECREF(offset2); + delta_d = ymd_to_ord(GET_YEAR(left), + GET_MONTH(left), + GET_DAY(left)) - + ymd_to_ord(GET_YEAR(right), + GET_MONTH(right), + GET_DAY(right)); + /* These can't overflow, since the values are + * normalized. At most this gives the number of + * seconds in one day. + */ + delta_s = (DATE_GET_HOUR(left) - + DATE_GET_HOUR(right)) * 3600 + + (DATE_GET_MINUTE(left) - + DATE_GET_MINUTE(right)) * 60 + + (DATE_GET_SECOND(left) - + DATE_GET_SECOND(right)); + delta_us = DATE_GET_MICROSECOND(left) - + DATE_GET_MICROSECOND(right); + result = new_delta(delta_d, delta_s, delta_us, 1); + if (offdiff != NULL) { + PyObject *temp = result; + result = delta_subtract(result, offdiff); + Py_DECREF(temp); + Py_DECREF(offdiff); + } + } + else if (PyDelta_Check(right)) { + /* datetime - delta */ + result = add_datetime_timedelta( + (PyDateTime_DateTime *)left, + (PyDateTime_Delta *)right, + -1); + } + } + + if (result == Py_NotImplemented) + Py_INCREF(result); + return result; +} + +/* Various ways to turn a datetime into a string. */ + +static PyObject * +datetime_repr(PyDateTime_DateTime *self) +{ + const char *type_name = Py_TYPE(self)->tp_name; + PyObject *baserepr; + + if (DATE_GET_MICROSECOND(self)) { + baserepr = PyUnicode_FromFormat( + "%s(%d, %d, %d, %d, %d, %d, %d)", + type_name, + GET_YEAR(self), GET_MONTH(self), GET_DAY(self), + DATE_GET_HOUR(self), DATE_GET_MINUTE(self), + DATE_GET_SECOND(self), + DATE_GET_MICROSECOND(self)); + } + else if (DATE_GET_SECOND(self)) { + baserepr = PyUnicode_FromFormat( + "%s(%d, %d, %d, %d, %d, %d)", + type_name, + GET_YEAR(self), GET_MONTH(self), GET_DAY(self), + DATE_GET_HOUR(self), DATE_GET_MINUTE(self), + DATE_GET_SECOND(self)); + } + else { + baserepr = PyUnicode_FromFormat( + "%s(%d, %d, %d, %d, %d)", + type_name, + GET_YEAR(self), GET_MONTH(self), GET_DAY(self), + DATE_GET_HOUR(self), DATE_GET_MINUTE(self)); + } + if (baserepr == NULL || ! HASTZINFO(self)) + return baserepr; + return append_keyword_tzinfo(baserepr, self->tzinfo); +} + +static PyObject * +datetime_str(PyDateTime_DateTime *self) +{ + return PyObject_CallMethod((PyObject *)self, "isoformat", "(s)", " "); +} + +static PyObject * +datetime_isoformat(PyDateTime_DateTime *self, PyObject *args, PyObject *kw) +{ + int sep = 'T'; + static char *keywords[] = {"sep", NULL}; + char buffer[100]; + PyObject *result; + int us = DATE_GET_MICROSECOND(self); + + if (!PyArg_ParseTupleAndKeywords(args, kw, "|C:isoformat", keywords, &sep)) + return NULL; + if (us) + result = PyUnicode_FromFormat("%04d-%02d-%02d%c%02d:%02d:%02d.%06d", + GET_YEAR(self), GET_MONTH(self), + GET_DAY(self), (int)sep, + DATE_GET_HOUR(self), DATE_GET_MINUTE(self), + DATE_GET_SECOND(self), us); + else + result = PyUnicode_FromFormat("%04d-%02d-%02d%c%02d:%02d:%02d", + GET_YEAR(self), GET_MONTH(self), + GET_DAY(self), (int)sep, + DATE_GET_HOUR(self), DATE_GET_MINUTE(self), + DATE_GET_SECOND(self)); + + if (!result || !HASTZINFO(self)) + return result; + + /* We need to append the UTC offset. */ + if (format_utcoffset(buffer, sizeof(buffer), ":", self->tzinfo, + (PyObject *)self) < 0) { + Py_DECREF(result); + return NULL; + } + PyUnicode_AppendAndDel(&result, PyUnicode_FromString(buffer)); + return result; +} + +static PyObject * +datetime_ctime(PyDateTime_DateTime *self) +{ + return format_ctime((PyDateTime_Date *)self, + DATE_GET_HOUR(self), + DATE_GET_MINUTE(self), + DATE_GET_SECOND(self)); +} + +/* Miscellaneous methods. */ + +static PyObject * +datetime_richcompare(PyObject *self, PyObject *other, int op) +{ + PyObject *result = NULL; + PyObject *offset1, *offset2; + int diff; + + if (! PyDateTime_Check(other)) { + if (PyDate_Check(other)) { + /* Prevent invocation of date_richcompare. We want to + return NotImplemented here to give the other object + a chance. But since DateTime is a subclass of + Date, if the other object is a Date, it would + compute an ordering based on the date part alone, + and we don't want that. So force unequal or + uncomparable here in that case. */ + if (op == Py_EQ) + Py_RETURN_FALSE; + if (op == Py_NE) + Py_RETURN_TRUE; + return cmperror(self, other); + } + Py_INCREF(Py_NotImplemented); + return Py_NotImplemented; + } + + if (GET_DT_TZINFO(self) == GET_DT_TZINFO(other)) { + diff = memcmp(((PyDateTime_DateTime *)self)->data, + ((PyDateTime_DateTime *)other)->data, + _PyDateTime_DATETIME_DATASIZE); + return diff_to_bool(diff, op); + } + offset1 = datetime_utcoffset(self, NULL); + if (offset1 == NULL) + return NULL; + offset2 = datetime_utcoffset(other, NULL); + if (offset2 == NULL) + goto done; + /* If they're both naive, or both aware and have the same offsets, + * we get off cheap. Note that if they're both naive, offset1 == + * offset2 == Py_None at this point. + */ + if ((offset1 == offset2) || + (PyDelta_Check(offset1) && PyDelta_Check(offset2) && + delta_cmp(offset1, offset2) == 0)) { + diff = memcmp(((PyDateTime_DateTime *)self)->data, + ((PyDateTime_DateTime *)other)->data, + _PyDateTime_DATETIME_DATASIZE); + result = diff_to_bool(diff, op); + } + else if (offset1 != Py_None && offset2 != Py_None) { + PyDateTime_Delta *delta; + + assert(offset1 != offset2); /* else last "if" handled it */ + delta = (PyDateTime_Delta *)datetime_subtract((PyObject *)self, + other); + if (delta == NULL) + goto done; + diff = GET_TD_DAYS(delta); + if (diff == 0) + diff = GET_TD_SECONDS(delta) | + GET_TD_MICROSECONDS(delta); + Py_DECREF(delta); + result = diff_to_bool(diff, op); + } + else { + PyErr_SetString(PyExc_TypeError, + "can't compare offset-naive and " + "offset-aware datetimes"); + } + done: + Py_DECREF(offset1); + Py_XDECREF(offset2); + return result; +} + +static long +datetime_hash(PyDateTime_DateTime *self) +{ + if (self->hashcode == -1) { + PyObject *offset; + + offset = datetime_utcoffset((PyObject *)self, NULL); + + if (offset == NULL) + return -1; + + /* Reduce this to a hash of another object. */ + if (offset == Py_None) + self->hashcode = generic_hash( + (unsigned char *)self->data, _PyDateTime_DATETIME_DATASIZE); + else { + PyObject *temp1, *temp2; + int days, seconds; + + assert(HASTZINFO(self)); + days = ymd_to_ord(GET_YEAR(self), + GET_MONTH(self), + GET_DAY(self)); + seconds = DATE_GET_HOUR(self) * 3600 + + DATE_GET_MINUTE(self) * 60 + + DATE_GET_SECOND(self); + temp1 = new_delta(days, seconds, + DATE_GET_MICROSECOND(self), + 1); + if (temp1 == NULL) { + Py_DECREF(offset); + return -1; + } + temp2 = delta_subtract(temp1, offset); + Py_DECREF(temp1); + if (temp2 == NULL) { + Py_DECREF(offset); + return -1; + } + self->hashcode = PyObject_Hash(temp2); + Py_DECREF(temp2); + } + Py_DECREF(offset); + } + return self->hashcode; +} + +static PyObject * +datetime_replace(PyDateTime_DateTime *self, PyObject *args, PyObject *kw) +{ + PyObject *clone; + PyObject *tuple; + int y = GET_YEAR(self); + int m = GET_MONTH(self); + int d = GET_DAY(self); + int hh = DATE_GET_HOUR(self); + int mm = DATE_GET_MINUTE(self); + int ss = DATE_GET_SECOND(self); + int us = DATE_GET_MICROSECOND(self); + PyObject *tzinfo = HASTZINFO(self) ? self->tzinfo : Py_None; + + if (! PyArg_ParseTupleAndKeywords(args, kw, "|iiiiiiiO:replace", + datetime_kws, + &y, &m, &d, &hh, &mm, &ss, &us, + &tzinfo)) + return NULL; + tuple = Py_BuildValue("iiiiiiiO", y, m, d, hh, mm, ss, us, tzinfo); + if (tuple == NULL) + return NULL; + clone = datetime_new(Py_TYPE(self), tuple, NULL); + Py_DECREF(tuple); + return clone; +} + +static PyObject * +datetime_astimezone(PyDateTime_DateTime *self, PyObject *args, PyObject *kw) +{ + PyObject *result; + PyObject *offset; + PyObject *temp; + PyObject *tzinfo; + static char *keywords[] = {"tz", NULL}; + + if (! PyArg_ParseTupleAndKeywords(args, kw, "O!:astimezone", keywords, + &PyDateTime_TZInfoType, &tzinfo)) + return NULL; + + if (!HASTZINFO(self) || self->tzinfo == Py_None) + goto NeedAware; + + /* Conversion to self's own time zone is a NOP. */ + if (self->tzinfo == tzinfo) { + Py_INCREF(self); + return (PyObject *)self; + } + + /* Convert self to UTC. */ + offset = datetime_utcoffset((PyObject *)self, NULL); + if (offset == NULL) + return NULL; + if (offset == Py_None) { + Py_DECREF(offset); + NeedAware: + PyErr_SetString(PyExc_ValueError, "astimezone() cannot be applied to " + "a naive datetime"); + return NULL; + } + + /* result = self - offset */ + result = add_datetime_timedelta(self, + (PyDateTime_Delta *)offset, -1); + Py_DECREF(offset); + if (result == NULL) + return NULL; + + /* Attach new tzinfo and let fromutc() do the rest. */ + temp = ((PyDateTime_DateTime *)result)->tzinfo; + ((PyDateTime_DateTime *)result)->tzinfo = tzinfo; + Py_INCREF(tzinfo); + Py_DECREF(temp); + + temp = result; + result = PyObject_CallMethod(tzinfo, "fromutc", "O", temp); + Py_DECREF(temp); + + return result; +} + +static PyObject * +datetime_timetuple(PyDateTime_DateTime *self) +{ + int dstflag = -1; + + if (HASTZINFO(self) && self->tzinfo != Py_None) { + PyObject * dst; + + dst = call_dst(self->tzinfo, (PyObject *)self); + if (dst == NULL) + return NULL; + + if (dst != Py_None) + dstflag = delta_bool((PyDateTime_Delta *)dst); + Py_DECREF(dst); + } + return build_struct_time(GET_YEAR(self), + GET_MONTH(self), + GET_DAY(self), + DATE_GET_HOUR(self), + DATE_GET_MINUTE(self), + DATE_GET_SECOND(self), + dstflag); +} + +static PyObject * +datetime_getdate(PyDateTime_DateTime *self) +{ + return new_date(GET_YEAR(self), + GET_MONTH(self), + GET_DAY(self)); +} + +static PyObject * +datetime_gettime(PyDateTime_DateTime *self) +{ + return new_time(DATE_GET_HOUR(self), + DATE_GET_MINUTE(self), + DATE_GET_SECOND(self), + DATE_GET_MICROSECOND(self), + Py_None); +} + +static PyObject * +datetime_gettimetz(PyDateTime_DateTime *self) +{ + return new_time(DATE_GET_HOUR(self), + DATE_GET_MINUTE(self), + DATE_GET_SECOND(self), + DATE_GET_MICROSECOND(self), + GET_DT_TZINFO(self)); +} + +static PyObject * +datetime_utctimetuple(PyDateTime_DateTime *self) +{ + int y, m, d, hh, mm, ss; + PyObject *tzinfo; + PyDateTime_DateTime *utcself; + + tzinfo = GET_DT_TZINFO(self); + if (tzinfo == Py_None) { + utcself = self; + Py_INCREF(utcself); + } + else { + PyObject *offset; + offset = call_utcoffset(tzinfo, (PyObject *)self); + if (offset == NULL) + return NULL; + if (offset == Py_None) { + Py_DECREF(offset); + utcself = self; + Py_INCREF(utcself); + } + else { + utcself = (PyDateTime_DateTime *)add_datetime_timedelta(self, + (PyDateTime_Delta *)offset, -1); + Py_DECREF(offset); + if (utcself == NULL) + return NULL; + } + } + y = GET_YEAR(utcself); + m = GET_MONTH(utcself); + d = GET_DAY(utcself); + hh = DATE_GET_HOUR(utcself); + mm = DATE_GET_MINUTE(utcself); + ss = DATE_GET_SECOND(utcself); + + Py_DECREF(utcself); + return build_struct_time(y, m, d, hh, mm, ss, 0); +} + +/* Pickle support, a simple use of __reduce__. */ + +/* Let basestate be the non-tzinfo data string. + * If tzinfo is None, this returns (basestate,), else (basestate, tzinfo). + * So it's a tuple in any (non-error) case. + * __getstate__ isn't exposed. + */ +static PyObject * +datetime_getstate(PyDateTime_DateTime *self) +{ + PyObject *basestate; + PyObject *result = NULL; + + basestate = PyBytes_FromStringAndSize((char *)self->data, + _PyDateTime_DATETIME_DATASIZE); + if (basestate != NULL) { + if (! HASTZINFO(self) || self->tzinfo == Py_None) + result = PyTuple_Pack(1, basestate); + else + result = PyTuple_Pack(2, basestate, self->tzinfo); + Py_DECREF(basestate); + } + return result; +} + +static PyObject * +datetime_reduce(PyDateTime_DateTime *self, PyObject *arg) +{ + return Py_BuildValue("(ON)", Py_TYPE(self), datetime_getstate(self)); +} + +static PyMethodDef datetime_methods[] = { + + /* Class methods: */ + + {"now", (PyCFunction)datetime_now, + METH_VARARGS | METH_KEYWORDS | METH_CLASS, + PyDoc_STR("[tz] -> new datetime with tz's local day and time.")}, + + {"utcnow", (PyCFunction)datetime_utcnow, + METH_NOARGS | METH_CLASS, + PyDoc_STR("Return a new datetime representing UTC day and time.")}, + + {"fromtimestamp", (PyCFunction)datetime_fromtimestamp, + METH_VARARGS | METH_KEYWORDS | METH_CLASS, + PyDoc_STR("timestamp[, tz] -> tz's local time from POSIX timestamp.")}, + + {"utcfromtimestamp", (PyCFunction)datetime_utcfromtimestamp, + METH_VARARGS | METH_CLASS, + PyDoc_STR("timestamp -> UTC datetime from a POSIX timestamp " + "(like time.time()).")}, + + {"strptime", (PyCFunction)datetime_strptime, + METH_VARARGS | METH_CLASS, + PyDoc_STR("string, format -> new datetime parsed from a string " + "(like time.strptime()).")}, + + {"combine", (PyCFunction)datetime_combine, + METH_VARARGS | METH_KEYWORDS | METH_CLASS, + PyDoc_STR("date, time -> datetime with same date and time fields")}, + + /* Instance methods: */ + + {"date", (PyCFunction)datetime_getdate, METH_NOARGS, + PyDoc_STR("Return date object with same year, month and day.")}, + + {"time", (PyCFunction)datetime_gettime, METH_NOARGS, + PyDoc_STR("Return time object with same time but with tzinfo=None.")}, + + {"timetz", (PyCFunction)datetime_gettimetz, METH_NOARGS, + PyDoc_STR("Return time object with same time and tzinfo.")}, + + {"ctime", (PyCFunction)datetime_ctime, METH_NOARGS, + PyDoc_STR("Return ctime() style string.")}, + + {"timetuple", (PyCFunction)datetime_timetuple, METH_NOARGS, + PyDoc_STR("Return time tuple, compatible with time.localtime().")}, + + {"utctimetuple", (PyCFunction)datetime_utctimetuple, METH_NOARGS, + PyDoc_STR("Return UTC time tuple, compatible with time.localtime().")}, + + {"isoformat", (PyCFunction)datetime_isoformat, METH_VARARGS | METH_KEYWORDS, + PyDoc_STR("[sep] -> string in ISO 8601 format, " + "YYYY-MM-DDTHH:MM:SS[.mmmmmm][+HH:MM].\n\n" + "sep is used to separate the year from the time, and " + "defaults to 'T'.")}, + + {"utcoffset", (PyCFunction)datetime_utcoffset, METH_NOARGS, + PyDoc_STR("Return self.tzinfo.utcoffset(self).")}, + + {"tzname", (PyCFunction)datetime_tzname, METH_NOARGS, + PyDoc_STR("Return self.tzinfo.tzname(self).")}, + + {"dst", (PyCFunction)datetime_dst, METH_NOARGS, + PyDoc_STR("Return self.tzinfo.dst(self).")}, + + {"replace", (PyCFunction)datetime_replace, METH_VARARGS | METH_KEYWORDS, + PyDoc_STR("Return datetime with new specified fields.")}, + + {"astimezone", (PyCFunction)datetime_astimezone, METH_VARARGS | METH_KEYWORDS, + PyDoc_STR("tz -> convert to local time in new timezone tz\n")}, + + {"__reduce__", (PyCFunction)datetime_reduce, METH_NOARGS, + PyDoc_STR("__reduce__() -> (cls, state)")}, + + {NULL, NULL} +}; + +static char datetime_doc[] = +PyDoc_STR("datetime(year, month, day[, hour[, minute[, second[, microsecond[,tzinfo]]]]])\n\ +\n\ +The year, month and day arguments are required. tzinfo may be None, or an\n\ +instance of a tzinfo subclass. The remaining arguments may be ints or longs.\n"); + +static PyNumberMethods datetime_as_number = { + datetime_add, /* nb_add */ + datetime_subtract, /* nb_subtract */ + 0, /* nb_multiply */ + 0, /* nb_remainder */ + 0, /* nb_divmod */ + 0, /* nb_power */ + 0, /* nb_negative */ + 0, /* nb_positive */ + 0, /* nb_absolute */ + 0, /* nb_bool */ +}; + +static PyTypeObject PyDateTime_DateTimeType = { + PyVarObject_HEAD_INIT(NULL, 0) + "datetime.datetime", /* tp_name */ + sizeof(PyDateTime_DateTime), /* tp_basicsize */ + 0, /* tp_itemsize */ + (destructor)datetime_dealloc, /* tp_dealloc */ + 0, /* tp_print */ + 0, /* tp_getattr */ + 0, /* tp_setattr */ + 0, /* tp_reserved */ + (reprfunc)datetime_repr, /* tp_repr */ + &datetime_as_number, /* tp_as_number */ + 0, /* tp_as_sequence */ + 0, /* tp_as_mapping */ + (hashfunc)datetime_hash, /* tp_hash */ + 0, /* tp_call */ + (reprfunc)datetime_str, /* tp_str */ + PyObject_GenericGetAttr, /* tp_getattro */ + 0, /* tp_setattro */ + 0, /* tp_as_buffer */ + Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */ + datetime_doc, /* tp_doc */ + 0, /* tp_traverse */ + 0, /* tp_clear */ + datetime_richcompare, /* tp_richcompare */ + 0, /* tp_weaklistoffset */ + 0, /* tp_iter */ + 0, /* tp_iternext */ + datetime_methods, /* tp_methods */ + 0, /* tp_members */ + datetime_getset, /* tp_getset */ + &PyDateTime_DateType, /* tp_base */ + 0, /* tp_dict */ + 0, /* tp_descr_get */ + 0, /* tp_descr_set */ + 0, /* tp_dictoffset */ + 0, /* tp_init */ + datetime_alloc, /* tp_alloc */ + datetime_new, /* tp_new */ + 0, /* tp_free */ +}; + +/* --------------------------------------------------------------------------- + * Module methods and initialization. + */ + +static PyMethodDef module_methods[] = { + {NULL, NULL} +}; + +/* C API. Clients get at this via PyDateTime_IMPORT, defined in + * datetime.h. + */ +static PyDateTime_CAPI CAPI = { + &PyDateTime_DateType, + &PyDateTime_DateTimeType, + &PyDateTime_TimeType, + &PyDateTime_DeltaType, + &PyDateTime_TZInfoType, + new_date_ex, + new_datetime_ex, + new_time_ex, + new_delta_ex, + datetime_fromtimestamp, + date_fromtimestamp +}; + + + +static struct PyModuleDef datetimemodule = { + PyModuleDef_HEAD_INIT, + "_datetime", + "Fast implementation of the datetime type.", + -1, + module_methods, + NULL, + NULL, + NULL, + NULL +}; + +PyMODINIT_FUNC +PyInit__datetime(void) +{ + PyObject *m; /* a module object */ + PyObject *d; /* its dict */ + PyObject *x; + PyObject *delta; + + m = PyModule_Create(&datetimemodule); + if (m == NULL) + return NULL; + + if (PyType_Ready(&PyDateTime_DateType) < 0) + return NULL; + if (PyType_Ready(&PyDateTime_DateTimeType) < 0) + return NULL; + if (PyType_Ready(&PyDateTime_DeltaType) < 0) + return NULL; + if (PyType_Ready(&PyDateTime_TimeType) < 0) + return NULL; + if (PyType_Ready(&PyDateTime_TZInfoType) < 0) + return NULL; + if (PyType_Ready(&PyDateTime_TimeZoneType) < 0) + return NULL; + + /* timedelta values */ + d = PyDateTime_DeltaType.tp_dict; + + x = new_delta(0, 0, 1, 0); + if (x == NULL || PyDict_SetItemString(d, "resolution", x) < 0) + return NULL; + Py_DECREF(x); + + x = new_delta(-MAX_DELTA_DAYS, 0, 0, 0); + if (x == NULL || PyDict_SetItemString(d, "min", x) < 0) + return NULL; + Py_DECREF(x); + + x = new_delta(MAX_DELTA_DAYS, 24*3600-1, 1000000-1, 0); + if (x == NULL || PyDict_SetItemString(d, "max", x) < 0) + return NULL; + Py_DECREF(x); + + /* date values */ + d = PyDateTime_DateType.tp_dict; + + x = new_date(1, 1, 1); + if (x == NULL || PyDict_SetItemString(d, "min", x) < 0) + return NULL; + Py_DECREF(x); + + x = new_date(MAXYEAR, 12, 31); + if (x == NULL || PyDict_SetItemString(d, "max", x) < 0) + return NULL; + Py_DECREF(x); + + x = new_delta(1, 0, 0, 0); + if (x == NULL || PyDict_SetItemString(d, "resolution", x) < 0) + return NULL; + Py_DECREF(x); + + /* time values */ + d = PyDateTime_TimeType.tp_dict; + + x = new_time(0, 0, 0, 0, Py_None); + if (x == NULL || PyDict_SetItemString(d, "min", x) < 0) + return NULL; + Py_DECREF(x); + + x = new_time(23, 59, 59, 999999, Py_None); + if (x == NULL || PyDict_SetItemString(d, "max", x) < 0) + return NULL; + Py_DECREF(x); + + x = new_delta(0, 0, 1, 0); + if (x == NULL || PyDict_SetItemString(d, "resolution", x) < 0) + return NULL; + Py_DECREF(x); + + /* datetime values */ + d = PyDateTime_DateTimeType.tp_dict; + + x = new_datetime(1, 1, 1, 0, 0, 0, 0, Py_None); + if (x == NULL || PyDict_SetItemString(d, "min", x) < 0) + return NULL; + Py_DECREF(x); + + x = new_datetime(MAXYEAR, 12, 31, 23, 59, 59, 999999, Py_None); + if (x == NULL || PyDict_SetItemString(d, "max", x) < 0) + return NULL; + Py_DECREF(x); + + x = new_delta(0, 0, 1, 0); + if (x == NULL || PyDict_SetItemString(d, "resolution", x) < 0) + return NULL; + Py_DECREF(x); + + /* timezone values */ + d = PyDateTime_TimeZoneType.tp_dict; + + delta = new_delta(0, 0, 0, 0); + if (delta == NULL) + return NULL; + x = new_timezone(delta, NULL); + Py_DECREF(delta); + if (x == NULL || PyDict_SetItemString(d, "utc", x) < 0) + return NULL; + PyDateTime_TimeZone_UTC = x; + + delta = new_delta(-1, 60, 0, 1); /* -23:59 */ + if (delta == NULL) + return NULL; + x = new_timezone(delta, NULL); + Py_DECREF(delta); + if (x == NULL || PyDict_SetItemString(d, "min", x) < 0) + return NULL; + Py_DECREF(x); + + delta = new_delta(0, (23 * 60 + 59) * 60, 0, 0); /* +23:59 */ + if (delta == NULL) + return NULL; + x = new_timezone(delta, NULL); + Py_DECREF(delta); + if (x == NULL || PyDict_SetItemString(d, "max", x) < 0) + return NULL; + Py_DECREF(x); + + /* module initialization */ + PyModule_AddIntConstant(m, "MINYEAR", MINYEAR); + PyModule_AddIntConstant(m, "MAXYEAR", MAXYEAR); + + Py_INCREF(&PyDateTime_DateType); + PyModule_AddObject(m, "date", (PyObject *) &PyDateTime_DateType); + + Py_INCREF(&PyDateTime_DateTimeType); + PyModule_AddObject(m, "datetime", + (PyObject *)&PyDateTime_DateTimeType); + + Py_INCREF(&PyDateTime_TimeType); + PyModule_AddObject(m, "time", (PyObject *) &PyDateTime_TimeType); + + Py_INCREF(&PyDateTime_DeltaType); + PyModule_AddObject(m, "timedelta", (PyObject *) &PyDateTime_DeltaType); + + Py_INCREF(&PyDateTime_TZInfoType); + PyModule_AddObject(m, "tzinfo", (PyObject *) &PyDateTime_TZInfoType); + + Py_INCREF(&PyDateTime_TimeZoneType); + PyModule_AddObject(m, "timezone", (PyObject *) &PyDateTime_TimeZoneType); + + x = PyCapsule_New(&CAPI, PyDateTime_CAPSULE_NAME, NULL); + if (x == NULL) + return NULL; + PyModule_AddObject(m, "datetime_CAPI", x); + + /* A 4-year cycle has an extra leap day over what we'd get from + * pasting together 4 single years. + */ + assert(DI4Y == 4 * 365 + 1); + assert(DI4Y == days_before_year(4+1)); + + /* Similarly, a 400-year cycle has an extra leap day over what we'd + * get from pasting together 4 100-year cycles. + */ + assert(DI400Y == 4 * DI100Y + 1); + assert(DI400Y == days_before_year(400+1)); + + /* OTOH, a 100-year cycle has one fewer leap day than we'd get from + * pasting together 25 4-year cycles. + */ + assert(DI100Y == 25 * DI4Y - 1); + assert(DI100Y == days_before_year(100+1)); + + us_per_us = PyLong_FromLong(1); + us_per_ms = PyLong_FromLong(1000); + us_per_second = PyLong_FromLong(1000000); + us_per_minute = PyLong_FromLong(60000000); + seconds_per_day = PyLong_FromLong(24 * 3600); + if (us_per_us == NULL || us_per_ms == NULL || us_per_second == NULL || + us_per_minute == NULL || seconds_per_day == NULL) + return NULL; + + /* The rest are too big for 32-bit ints, but even + * us_per_week fits in 40 bits, so doubles should be exact. + */ + us_per_hour = PyLong_FromDouble(3600000000.0); + us_per_day = PyLong_FromDouble(86400000000.0); + us_per_week = PyLong_FromDouble(604800000000.0); + if (us_per_hour == NULL || us_per_day == NULL || us_per_week == NULL) + return NULL; + return m; +} + +/* --------------------------------------------------------------------------- +Some time zone algebra. For a datetime x, let + x.n = x stripped of its timezone -- its naive time. + x.o = x.utcoffset(), and assuming that doesn't raise an exception or + return None + x.d = x.dst(), and assuming that doesn't raise an exception or + return None + x.s = x's standard offset, x.o - x.d + +Now some derived rules, where k is a duration (timedelta). + +1. x.o = x.s + x.d + This follows from the definition of x.s. + +2. If x and y have the same tzinfo member, x.s = y.s. + This is actually a requirement, an assumption we need to make about + sane tzinfo classes. + +3. The naive UTC time corresponding to x is x.n - x.o. + This is again a requirement for a sane tzinfo class. + +4. (x+k).s = x.s + This follows from #2, and that datimetimetz+timedelta preserves tzinfo. + +5. (x+k).n = x.n + k + Again follows from how arithmetic is defined. + +Now we can explain tz.fromutc(x). Let's assume it's an interesting case +(meaning that the various tzinfo methods exist, and don't blow up or return +None when called). + +The function wants to return a datetime y with timezone tz, equivalent to x. +x is already in UTC. + +By #3, we want + + y.n - y.o = x.n [1] + +The algorithm starts by attaching tz to x.n, and calling that y. So +x.n = y.n at the start. Then it wants to add a duration k to y, so that [1] +becomes true; in effect, we want to solve [2] for k: + + (y+k).n - (y+k).o = x.n [2] + +By #1, this is the same as + + (y+k).n - ((y+k).s + (y+k).d) = x.n [3] + +By #5, (y+k).n = y.n + k, which equals x.n + k because x.n=y.n at the start. +Substituting that into [3], + + x.n + k - (y+k).s - (y+k).d = x.n; the x.n terms cancel, leaving + k - (y+k).s - (y+k).d = 0; rearranging, + k = (y+k).s - (y+k).d; by #4, (y+k).s == y.s, so + k = y.s - (y+k).d + +On the RHS, (y+k).d can't be computed directly, but y.s can be, and we +approximate k by ignoring the (y+k).d term at first. Note that k can't be +very large, since all offset-returning methods return a duration of magnitude +less than 24 hours. For that reason, if y is firmly in std time, (y+k).d must +be 0, so ignoring it has no consequence then. + +In any case, the new value is + + z = y + y.s [4] + +It's helpful to step back at look at [4] from a higher level: it's simply +mapping from UTC to tz's standard time. + +At this point, if + + z.n - z.o = x.n [5] + +we have an equivalent time, and are almost done. The insecurity here is +at the start of daylight time. Picture US Eastern for concreteness. The wall +time jumps from 1:59 to 3:00, and wall hours of the form 2:MM don't make good +sense then. The docs ask that an Eastern tzinfo class consider such a time to +be EDT (because it's "after 2"), which is a redundant spelling of 1:MM EST +on the day DST starts. We want to return the 1:MM EST spelling because that's +the only spelling that makes sense on the local wall clock. + +In fact, if [5] holds at this point, we do have the standard-time spelling, +but that takes a bit of proof. We first prove a stronger result. What's the +difference between the LHS and RHS of [5]? Let + + diff = x.n - (z.n - z.o) [6] + +Now + z.n = by [4] + (y + y.s).n = by #5 + y.n + y.s = since y.n = x.n + x.n + y.s = since z and y are have the same tzinfo member, + y.s = z.s by #2 + x.n + z.s + +Plugging that back into [6] gives + + diff = + x.n - ((x.n + z.s) - z.o) = expanding + x.n - x.n - z.s + z.o = cancelling + - z.s + z.o = by #2 + z.d + +So diff = z.d. + +If [5] is true now, diff = 0, so z.d = 0 too, and we have the standard-time +spelling we wanted in the endcase described above. We're done. Contrarily, +if z.d = 0, then we have a UTC equivalent, and are also done. + +If [5] is not true now, diff = z.d != 0, and z.d is the offset we need to +add to z (in effect, z is in tz's standard time, and we need to shift the +local clock into tz's daylight time). + +Let + + z' = z + z.d = z + diff [7] + +and we can again ask whether + + z'.n - z'.o = x.n [8] + +If so, we're done. If not, the tzinfo class is insane, according to the +assumptions we've made. This also requires a bit of proof. As before, let's +compute the difference between the LHS and RHS of [8] (and skipping some of +the justifications for the kinds of substitutions we've done several times +already): + + diff' = x.n - (z'.n - z'.o) = replacing z'.n via [7] + x.n - (z.n + diff - z'.o) = replacing diff via [6] + x.n - (z.n + x.n - (z.n - z.o) - z'.o) = + x.n - z.n - x.n + z.n - z.o + z'.o = cancel x.n + - z.n + z.n - z.o + z'.o = cancel z.n + - z.o + z'.o = #1 twice + -z.s - z.d + z'.s + z'.d = z and z' have same tzinfo + z'.d - z.d + +So z' is UTC-equivalent to x iff z'.d = z.d at this point. If they are equal, +we've found the UTC-equivalent so are done. In fact, we stop with [7] and +return z', not bothering to compute z'.d. + +How could z.d and z'd differ? z' = z + z.d [7], so merely moving z' by +a dst() offset, and starting *from* a time already in DST (we know z.d != 0), +would have to change the result dst() returns: we start in DST, and moving +a little further into it takes us out of DST. + +There isn't a sane case where this can happen. The closest it gets is at +the end of DST, where there's an hour in UTC with no spelling in a hybrid +tzinfo class. In US Eastern, that's 5:MM UTC = 0:MM EST = 1:MM EDT. During +that hour, on an Eastern clock 1:MM is taken as being in standard time (6:MM +UTC) because the docs insist on that, but 0:MM is taken as being in daylight +time (4:MM UTC). There is no local time mapping to 5:MM UTC. The local +clock jumps from 1:59 back to 1:00 again, and repeats the 1:MM hour in +standard time. Since that's what the local clock *does*, we want to map both +UTC hours 5:MM and 6:MM to 1:MM Eastern. The result is ambiguous +in local time, but so it goes -- it's the way the local clock works. + +When x = 5:MM UTC is the input to this algorithm, x.o=0, y.o=-5 and y.d=0, +so z=0:MM. z.d=60 (minutes) then, so [5] doesn't hold and we keep going. +z' = z + z.d = 1:MM then, and z'.d=0, and z'.d - z.d = -60 != 0 so [8] +(correctly) concludes that z' is not UTC-equivalent to x. + +Because we know z.d said z was in daylight time (else [5] would have held and +we would have stopped then), and we know z.d != z'.d (else [8] would have held +and we would have stopped then), and there are only 2 possible values dst() can +return in Eastern, it follows that z'.d must be 0 (which it is in the example, +but the reasoning doesn't depend on the example -- it depends on there being +two possible dst() outcomes, one zero and the other non-zero). Therefore +z' must be in standard time, and is the spelling we want in this case. + +Note again that z' is not UTC-equivalent as far as the hybrid tzinfo class is +concerned (because it takes z' as being in standard time rather than the +daylight time we intend here), but returning it gives the real-life "local +clock repeats an hour" behavior when mapping the "unspellable" UTC hour into +tz. + +When the input is 6:MM, z=1:MM and z.d=0, and we stop at once, again with +the 1:MM standard time spelling we want. + +So how can this break? One of the assumptions must be violated. Two +possibilities: + +1) [2] effectively says that y.s is invariant across all y belong to a given + time zone. This isn't true if, for political reasons or continental drift, + a region decides to change its base offset from UTC. + +2) There may be versions of "double daylight" time where the tail end of + the analysis gives up a step too early. I haven't thought about that + enough to say. + +In any case, it's clear that the default fromutc() is strong enough to handle +"almost all" time zones: so long as the standard offset is invariant, it +doesn't matter if daylight time transition points change from year to year, or +if daylight time is skipped in some years; it doesn't matter how large or +small dst() may get within its bounds; and it doesn't even matter if some +perverse time zone returns a negative dst()). So a breaking case must be +pretty bizarre, and a tzinfo subclass can override fromutc() if it is. +--------------------------------------------------------------------------- */ |