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np_datetime_strings.c
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/*
* This file implements string parsing and creation for NumPy datetime.
*
* Written by Mark Wiebe ([email protected])
* Copyright (c) 2011 by Enthought, Inc.
*
* See NP_LICENSE.txt for the license.
*/
#define PY_SSIZE_T_CLEAN
#define NO_IMPORT
#include <Python.h>
#include <time.h>
#include <numpy/arrayobject.h>
#include "numpy/arrayscalars.h"
#include "np_datetime.h"
#include "np_datetime_strings.h"
NPY_NO_EXPORT const char *
npy_casting_to_string(NPY_CASTING casting)
{
switch (casting) {
case NPY_NO_CASTING:
return "'no'";
case NPY_EQUIV_CASTING:
return "'equiv'";
case NPY_SAFE_CASTING:
return "'safe'";
case NPY_SAME_KIND_CASTING:
return "'same_kind'";
case NPY_UNSAFE_CASTING:
return "'unsafe'";
default:
return "<unknown>";
}
}
/* Platform-specific time_t typedef */
typedef time_t NPY_TIME_T;
/*// We *do* want these symbols, but for cython, not for C. fine in mac osx,*/
/*// linux complains.*/
/*static void _suppress_unused_variable_warning(void)*/
/*{*/
/* int x = days_per_month_table[0][0];*/
/* x = x;*/
/* int y = _month_offset[0][0];*/
/* y = y;*/
/* char *z = _datetime_strings[0];*/
/* z = z;*/
/*}*/
/* Exported as DATETIMEUNITS in multiarraymodule.c */
static char *_datetime_strings[PANDAS_DATETIME_NUMUNITS] = {
"Y",
"M",
"W",
"D",
"h",
"m",
"s",
"ms",
"us",
"ns",
"ps",
"fs",
"as",
};
/*
* Wraps `localtime` functionality for multiple platforms. This
* converts a time value to a time structure in the local timezone.
*
* Returns 0 on success, -1 on failure.
*/
static int
get_localtime(NPY_TIME_T *ts, struct tm *tms)
{
char *func_name = "<unknown>";
#if defined(_WIN32)
#if defined(_MSC_VER) && (_MSC_VER >= 1400)
if (localtime_s(tms, ts) != 0) {
func_name = "localtime_s";
goto fail;
}
#elif defined(__GNUC__) && defined(NPY_MINGW_USE_CUSTOM_MSVCR)
if (_localtime64_s(tms, ts) != 0) {
func_name = "_localtime64_s";
goto fail;
}
#else
struct tm *tms_tmp;
tms_tmp = localtime(ts);
if (tms_tmp == NULL) {
func_name = "localtime";
goto fail;
}
memcpy(tms, tms_tmp, sizeof(struct tm));
#endif
#else
if (localtime_r(ts, tms) == NULL) {
func_name = "localtime_r";
goto fail;
}
#endif
return 0;
fail:
PyErr_Format(PyExc_OSError, "Failed to use '%s' to convert "
"to a local time", func_name);
return -1;
}
/*
* Wraps `gmtime` functionality for multiple platforms. This
* converts a time value to a time structure in UTC.
*
* Returns 0 on success, -1 on failure.
*/
static int
get_gmtime(NPY_TIME_T *ts, struct tm *tms)
{
char *func_name = "<unknown>";
#if defined(_WIN32)
#if defined(_MSC_VER) && (_MSC_VER >= 1400)
if (gmtime_s(tms, ts) != 0) {
func_name = "gmtime_s";
goto fail;
}
#elif defined(__GNUC__) && defined(NPY_MINGW_USE_CUSTOM_MSVCR)
if (_gmtime64_s(tms, ts) != 0) {
func_name = "_gmtime64_s";
goto fail;
}
#else
struct tm *tms_tmp;
tms_tmp = gmtime(ts);
if (tms_tmp == NULL) {
func_name = "gmtime";
goto fail;
}
memcpy(tms, tms_tmp, sizeof(struct tm));
#endif
#else
if (gmtime_r(ts, tms) == NULL) {
func_name = "gmtime_r";
goto fail;
}
#endif
return 0;
fail:
PyErr_Format(PyExc_OSError, "Failed to use '%s' to convert "
"to a UTC time", func_name);
return -1;
}
/*
* Converts a datetimestruct in UTC to a datetimestruct in local time,
* also returning the timezone offset applied.
*
* Returns 0 on success, -1 on failure.
*/
static int
convert_datetimestruct_utc_to_local(pandas_datetimestruct *out_dts_local,
const pandas_datetimestruct *dts_utc, int *out_timezone_offset)
{
NPY_TIME_T rawtime = 0, localrawtime;
struct tm tm_;
npy_int64 year_correction = 0;
/* Make a copy of the input 'dts' to modify */
*out_dts_local = *dts_utc;
/* HACK: Use a year < 2038 for later years for small time_t */
if (sizeof(NPY_TIME_T) == 4 && out_dts_local->year >= 2038) {
if (is_leapyear(out_dts_local->year)) {
/* 2036 is a leap year */
year_correction = out_dts_local->year - 2036;
out_dts_local->year -= year_correction;
}
else {
/* 2037 is not a leap year */
year_correction = out_dts_local->year - 2037;
out_dts_local->year -= year_correction;
}
}
/*
* Convert everything in 'dts' to a time_t, to minutes precision.
* This is POSIX time, which skips leap-seconds, but because
* we drop the seconds value from the pandas_datetimestruct, everything
* is ok for this operation.
*/
rawtime = (time_t)get_datetimestruct_days(out_dts_local) * 24 * 60 * 60;
rawtime += dts_utc->hour * 60 * 60;
rawtime += dts_utc->min * 60;
/* localtime converts a 'time_t' into a local 'struct tm' */
if (get_localtime(&rawtime, &tm_) < 0) {
return -1;
}
/* Copy back all the values except seconds */
out_dts_local->min = tm_.tm_min;
out_dts_local->hour = tm_.tm_hour;
out_dts_local->day = tm_.tm_mday;
out_dts_local->month = tm_.tm_mon + 1;
out_dts_local->year = tm_.tm_year + 1900;
/* Extract the timezone offset that was applied */
rawtime /= 60;
localrawtime = (time_t)get_datetimestruct_days(out_dts_local) * 24 * 60;
localrawtime += out_dts_local->hour * 60;
localrawtime += out_dts_local->min;
*out_timezone_offset = localrawtime - rawtime;
/* Reapply the year 2038 year correction HACK */
out_dts_local->year += year_correction;
return 0;
}
#if 0
/*
* Converts a datetimestruct in local time to a datetimestruct in UTC.
*
* Returns 0 on success, -1 on failure.
*/
static int
convert_datetimestruct_local_to_utc(pandas_datetimestruct *out_dts_utc,
const pandas_datetimestruct *dts_local)
{
npy_int64 year_correction = 0;
/* Make a copy of the input 'dts' to modify */
*out_dts_utc = *dts_local;
/* HACK: Use a year < 2038 for later years for small time_t */
if (sizeof(NPY_TIME_T) == 4 && out_dts_utc->year >= 2038) {
if (is_leapyear(out_dts_utc->year)) {
/* 2036 is a leap year */
year_correction = out_dts_utc->year - 2036;
out_dts_utc->year -= year_correction;
}
else {
/* 2037 is not a leap year */
year_correction = out_dts_utc->year - 2037;
out_dts_utc->year -= year_correction;
}
}
/*
* ISO 8601 states to treat date-times without a timezone offset
* or 'Z' for UTC as local time. The C standard libary functions
* mktime and gmtime allow us to do this conversion.
*
* Only do this timezone adjustment for recent and future years.
* In this case, "recent" is defined to be 1970 and later, because
* on MS Windows, mktime raises an error when given an earlier date.
*/
if (out_dts_utc->year >= 1970) {
NPY_TIME_T rawtime = 0;
struct tm tm_;
tm_.tm_sec = out_dts_utc->sec;
tm_.tm_min = out_dts_utc->min;
tm_.tm_hour = out_dts_utc->hour;
tm_.tm_mday = out_dts_utc->day;
tm_.tm_mon = out_dts_utc->month - 1;
tm_.tm_year = out_dts_utc->year - 1900;
tm_.tm_isdst = -1;
/* mktime converts a local 'struct tm' into a time_t */
rawtime = mktime(&tm_);
if (rawtime == -1) {
PyErr_SetString(PyExc_OSError, "Failed to use mktime to "
"convert local time to UTC");
return -1;
}
/* gmtime converts a 'time_t' into a UTC 'struct tm' */
if (get_gmtime(&rawtime, &tm_) < 0) {
return -1;
}
out_dts_utc->sec = tm_.tm_sec;
out_dts_utc->min = tm_.tm_min;
out_dts_utc->hour = tm_.tm_hour;
out_dts_utc->day = tm_.tm_mday;
out_dts_utc->month = tm_.tm_mon + 1;
out_dts_utc->year = tm_.tm_year + 1900;
}
/* Reapply the year 2038 year correction HACK */
out_dts_utc->year += year_correction;
return 0;
}
#endif
/* int */
/* parse_python_string(PyObject* obj, pandas_datetimestruct *dts) { */
/* PyObject *bytes = NULL; */
/* char *str = NULL; */
/* Py_ssize_t len = 0; */
/* PANDAS_DATETIMEUNIT bestunit = -1; */
/* /\* Convert to an ASCII string for the date parser *\/ */
/* if (PyUnicode_Check(obj)) { */
/* bytes = PyUnicode_AsASCIIString(obj); */
/* if (bytes == NULL) { */
/* return -1; */
/* } */
/* } */
/* else { */
/* bytes = obj; */
/* Py_INCREF(bytes); */
/* } */
/* if (PyBytes_AsStringAndSize(bytes, &str, &len) == -1) { */
/* Py_DECREF(bytes); */
/* return -1; */
/* } */
/* /\* Parse the ISO date *\/ */
/* if (parse_iso_8601_datetime(str, len, PANDAS_FR_us, NPY_UNSAFE_CASTING, */
/* dts, NULL, &bestunit, NULL) < 0) { */
/* Py_DECREF(bytes); */
/* return -1; */
/* } */
/* Py_DECREF(bytes); */
/* return 0; */
/* } */
/*
* Parses (almost) standard ISO 8601 date strings. The differences are:
*
* + The date "20100312" is parsed as the year 20100312, not as
* equivalent to "2010-03-12". The '-' in the dates are not optional.
* + Only seconds may have a decimal point, with up to 18 digits after it
* (maximum attoseconds precision).
* + Either a 'T' as in ISO 8601 or a ' ' may be used to separate
* the date and the time. Both are treated equivalently.
* + Doesn't (yet) handle the "YYYY-DDD" or "YYYY-Www" formats.
* + Doesn't handle leap seconds (seconds value has 60 in these cases).
* + Doesn't handle 24:00:00 as synonym for midnight (00:00:00) tomorrow
* + Accepts special values "NaT" (not a time), "Today", (current
* day according to local time) and "Now" (current time in UTC).
*
* 'str' must be a NULL-terminated string, and 'len' must be its length.
* 'unit' should contain -1 if the unit is unknown, or the unit
* which will be used if it is.
* 'casting' controls how the detected unit from the string is allowed
* to be cast to the 'unit' parameter.
*
* 'out' gets filled with the parsed date-time.
* 'out_local' gets whether returned value contains timezone. 0 for UTC, 1 for local time.
* 'out_tzoffset' gets set to timezone offset by minutes
* if the parsed time was in local time,
* to 0 otherwise. The values 'now' and 'today' don't get counted
* as local, and neither do UTC +/-#### timezone offsets, because
* they aren't using the computer's local timezone offset.
* 'out_bestunit' gives a suggested unit based on the amount of
* resolution provided in the string, or -1 for NaT.
* 'out_special' gets set to 1 if the parsed time was 'today',
* 'now', or ''/'NaT'. For 'today', the unit recommended is
* 'D', for 'now', the unit recommended is 's', and for 'NaT'
* the unit recommended is 'Y'.
*
* Returns 0 on success, -1 on failure.
*/
int
parse_iso_8601_datetime(char *str, int len,
PANDAS_DATETIMEUNIT unit,
NPY_CASTING casting,
pandas_datetimestruct *out,
int *out_local,
int *out_tzoffset,
PANDAS_DATETIMEUNIT *out_bestunit,
npy_bool *out_special)
{
int year_leap = 0;
int i, numdigits;
char *substr, sublen;
PANDAS_DATETIMEUNIT bestunit;
/* Initialize the output to all zeros */
memset(out, 0, sizeof(pandas_datetimestruct));
out->month = 1;
out->day = 1;
/*
* The string "today" means take today's date in local time, and
* convert it to a date representation. This date representation, if
* forced into a time unit, will be at midnight UTC.
* This is perhaps a little weird, but done so that the
* 'datetime64[D]' type produces the date you expect, rather than
* switching to an adjacent day depending on the current time and your
* timezone.
*/
if (len == 5 && tolower(str[0]) == 't' &&
tolower(str[1]) == 'o' &&
tolower(str[2]) == 'd' &&
tolower(str[3]) == 'a' &&
tolower(str[4]) == 'y') {
NPY_TIME_T rawtime = 0;
struct tm tm_;
time(&rawtime);
if (get_localtime(&rawtime, &tm_) < 0) {
return -1;
}
out->year = tm_.tm_year + 1900;
out->month = tm_.tm_mon + 1;
out->day = tm_.tm_mday;
bestunit = PANDAS_FR_D;
/*
* Indicate that this was a special value, and
* is a date (unit 'D').
*/
if (out_local != NULL) {
*out_local = 0;
}
if (out_bestunit != NULL) {
*out_bestunit = bestunit;
}
if (out_special != NULL) {
*out_special = 1;
}
/* Check the casting rule */
if (unit != -1 && !can_cast_datetime64_units(bestunit, unit,
casting)) {
PyErr_Format(PyExc_TypeError, "Cannot parse \"%s\" as unit "
"'%s' using casting rule %s",
str, _datetime_strings[unit],
npy_casting_to_string(casting));
return -1;
}
return 0;
}
/* The string "now" resolves to the current UTC time */
if (len == 3 && tolower(str[0]) == 'n' &&
tolower(str[1]) == 'o' &&
tolower(str[2]) == 'w') {
NPY_TIME_T rawtime = 0;
pandas_datetime_metadata meta;
time(&rawtime);
/* Set up a dummy metadata for the conversion */
meta.base = PANDAS_FR_s;
meta.num = 1;
bestunit = PANDAS_FR_s;
/*
* Indicate that this was a special value, and
* use 's' because the time() function has resolution
* seconds.
*/
if (out_local != NULL) {
*out_local = 0;
}
if (out_bestunit != NULL) {
*out_bestunit = bestunit;
}
if (out_special != NULL) {
*out_special = 1;
}
/* Check the casting rule */
if (unit != -1 && !can_cast_datetime64_units(bestunit, unit,
casting)) {
PyErr_Format(PyExc_TypeError, "Cannot parse \"%s\" as unit "
"'%s' using casting rule %s",
str, _datetime_strings[unit],
npy_casting_to_string(casting));
return -1;
}
return convert_datetime_to_datetimestruct(&meta, rawtime, out);
}
/* Anything else isn't a special value */
if (out_special != NULL) {
*out_special = 0;
}
substr = str;
sublen = len;
/* Skip leading whitespace */
while (sublen > 0 && isspace(*substr)) {
++substr;
--sublen;
}
/* Leading '-' sign for negative year */
if (*substr == '-') {
++substr;
--sublen;
}
if (sublen == 0) {
goto parse_error;
}
/* PARSE THE YEAR (digits until the '-' character) */
out->year = 0;
while (sublen > 0 && isdigit(*substr)) {
out->year = 10 * out->year + (*substr - '0');
++substr;
--sublen;
}
/* Negate the year if necessary */
if (str[0] == '-') {
out->year = -out->year;
}
/* Check whether it's a leap-year */
year_leap = is_leapyear(out->year);
/* Next character must be a '-' or the end of the string */
if (sublen == 0) {
if (out_local != NULL) {
*out_local = 0;
}
bestunit = PANDAS_FR_Y;
goto finish;
}
else if (*substr == '-') {
++substr;
--sublen;
}
else {
goto parse_error;
}
/* Can't have a trailing '-' */
if (sublen == 0) {
goto parse_error;
}
/* PARSE THE MONTH (2 digits) */
if (sublen >= 2 && isdigit(substr[0]) && isdigit(substr[1])) {
out->month = 10 * (substr[0] - '0') + (substr[1] - '0');
if (out->month < 1 || out->month > 12) {
PyErr_Format(PyExc_ValueError,
"Month out of range in datetime string \"%s\"", str);
goto error;
}
substr += 2;
sublen -= 2;
}
else {
goto parse_error;
}
/* Next character must be a '-' or the end of the string */
if (sublen == 0) {
if (out_local != NULL) {
*out_local = 0;
}
bestunit = PANDAS_FR_M;
goto finish;
}
else if (*substr == '-') {
++substr;
--sublen;
}
else {
goto parse_error;
}
/* Can't have a trailing '-' */
if (sublen == 0) {
goto parse_error;
}
/* PARSE THE DAY (2 digits) */
if (sublen >= 2 && isdigit(substr[0]) && isdigit(substr[1])) {
out->day = 10 * (substr[0] - '0') + (substr[1] - '0');
if (out->day < 1 ||
out->day > days_per_month_table[year_leap][out->month-1]) {
PyErr_Format(PyExc_ValueError,
"Day out of range in datetime string \"%s\"", str);
goto error;
}
substr += 2;
sublen -= 2;
}
else {
goto parse_error;
}
/* Next character must be a 'T', ' ', or end of string */
if (sublen == 0) {
if (out_local != NULL) {
*out_local = 0;
}
bestunit = PANDAS_FR_D;
goto finish;
}
else if (*substr != 'T' && *substr != ' ') {
goto parse_error;
}
else {
++substr;
--sublen;
}
/* PARSE THE HOURS (2 digits) */
if (sublen >= 2 && isdigit(substr[0]) && isdigit(substr[1])) {
out->hour = 10 * (substr[0] - '0') + (substr[1] - '0');
if (out->hour < 0 || out->hour >= 24) {
PyErr_Format(PyExc_ValueError,
"Hours out of range in datetime string \"%s\"", str);
goto error;
}
substr += 2;
sublen -= 2;
}
else {
goto parse_error;
}
/* Next character must be a ':' or the end of the string */
if (sublen > 0 && *substr == ':') {
++substr;
--sublen;
}
else {
bestunit = PANDAS_FR_h;
goto parse_timezone;
}
/* Can't have a trailing ':' */
if (sublen == 0) {
goto parse_error;
}
/* PARSE THE MINUTES (2 digits) */
if (sublen >= 2 && isdigit(substr[0]) && isdigit(substr[1])) {
out->min = 10 * (substr[0] - '0') + (substr[1] - '0');
if (out->hour < 0 || out->min >= 60) {
PyErr_Format(PyExc_ValueError,
"Minutes out of range in datetime string \"%s\"", str);
goto error;
}
substr += 2;
sublen -= 2;
}
else {
goto parse_error;
}
/* Next character must be a ':' or the end of the string */
if (sublen > 0 && *substr == ':') {
++substr;
--sublen;
}
else {
bestunit = PANDAS_FR_m;
goto parse_timezone;
}
/* Can't have a trailing ':' */
if (sublen == 0) {
goto parse_error;
}
/* PARSE THE SECONDS (2 digits) */
if (sublen >= 2 && isdigit(substr[0]) && isdigit(substr[1])) {
out->sec = 10 * (substr[0] - '0') + (substr[1] - '0');
if (out->sec < 0 || out->sec >= 60) {
PyErr_Format(PyExc_ValueError,
"Seconds out of range in datetime string \"%s\"", str);
goto error;
}
substr += 2;
sublen -= 2;
}
else {
goto parse_error;
}
/* Next character may be a '.' indicating fractional seconds */
if (sublen > 0 && *substr == '.') {
++substr;
--sublen;
}
else {
bestunit = PANDAS_FR_s;
goto parse_timezone;
}
/* PARSE THE MICROSECONDS (0 to 6 digits) */
numdigits = 0;
for (i = 0; i < 6; ++i) {
out->us *= 10;
if (sublen > 0 && isdigit(*substr)) {
out->us += (*substr - '0');
++substr;
--sublen;
++numdigits;
}
}
if (sublen == 0 || !isdigit(*substr)) {
if (numdigits > 3) {
bestunit = PANDAS_FR_us;
}
else {
bestunit = PANDAS_FR_ms;
}
goto parse_timezone;
}
/* PARSE THE PICOSECONDS (0 to 6 digits) */
numdigits = 0;
for (i = 0; i < 6; ++i) {
out->ps *= 10;
if (sublen > 0 && isdigit(*substr)) {
out->ps += (*substr - '0');
++substr;
--sublen;
++numdigits;
}
}
if (sublen == 0 || !isdigit(*substr)) {
if (numdigits > 3) {
bestunit = PANDAS_FR_ps;
}
else {
bestunit = PANDAS_FR_ns;
}
goto parse_timezone;
}
/* PARSE THE ATTOSECONDS (0 to 6 digits) */
numdigits = 0;
for (i = 0; i < 6; ++i) {
out->as *= 10;
if (sublen > 0 && isdigit(*substr)) {
out->as += (*substr - '0');
++substr;
--sublen;
++numdigits;
}
}
if (numdigits > 3) {
bestunit = PANDAS_FR_as;
}
else {
bestunit = PANDAS_FR_fs;
}
parse_timezone:
if (sublen == 0) {
// Unlike NumPy, treating no time zone as naive
goto finish;
}
/* UTC specifier */
if (*substr == 'Z') {
/* "Z" means not local */
if (out_local != NULL) {
*out_local = 0;
}
if (sublen == 1) {
goto finish;
}
else {
++substr;
--sublen;
}
}
/* Time zone offset */
else if (*substr == '-' || *substr == '+') {
int offset_neg = 0, offset_hour = 0, offset_minute = 0;
/*
* Since "local" means local with respect to the current
* machine, we say this is non-local.
*/
if (*substr == '-') {
offset_neg = 1;
}
++substr;
--sublen;
/* The hours offset */
if (sublen >= 2 && isdigit(substr[0]) && isdigit(substr[1])) {
offset_hour = 10 * (substr[0] - '0') + (substr[1] - '0');
substr += 2;
sublen -= 2;
if (offset_hour >= 24) {
PyErr_Format(PyExc_ValueError,
"Timezone hours offset out of range "
"in datetime string \"%s\"", str);
goto error;
}
}
else {
goto parse_error;
}
/* The minutes offset is optional */
if (sublen > 0) {
/* Optional ':' */
if (*substr == ':') {
++substr;
--sublen;
}
/* The minutes offset (at the end of the string) */
if (sublen >= 2 && isdigit(substr[0]) && isdigit(substr[1])) {
offset_minute = 10 * (substr[0] - '0') + (substr[1] - '0');
substr += 2;
sublen -= 2;
if (offset_minute >= 60) {
PyErr_Format(PyExc_ValueError,
"Timezone minutes offset out of range "
"in datetime string \"%s\"", str);
goto error;
}
}
else {
goto parse_error;
}
}
/* Apply the time zone offset */
if (offset_neg) {
offset_hour = -offset_hour;
offset_minute = -offset_minute;
}
if (out_local != NULL) {
*out_local = 1;
// Unlike NumPy, do not change internal value to local time
*out_tzoffset = 60 * offset_hour - offset_minute;
}
}
/* Skip trailing whitespace */
while (sublen > 0 && isspace(*substr)) {
++substr;
--sublen;
}
if (sublen != 0) {
goto parse_error;
}
finish:
if (out_bestunit != NULL) {
*out_bestunit = bestunit;
}
/* Check the casting rule */
if (unit != -1 && !can_cast_datetime64_units(bestunit, unit,
casting)) {
PyErr_Format(PyExc_TypeError, "Cannot parse \"%s\" as unit "
"'%s' using casting rule %s",
str, _datetime_strings[unit],
npy_casting_to_string(casting));
return -1;
}
return 0;
parse_error:
PyErr_Format(PyExc_ValueError,
"Error parsing datetime string \"%s\" at position %d",
str, (int)(substr-str));
return -1;
error:
return -1;
}
/*
* Provides a string length to use for converting datetime
* objects with the given local and unit settings.
*/
int
get_datetime_iso_8601_strlen(int local, PANDAS_DATETIMEUNIT base)
{
int len = 0;
/* If no unit is provided, return the maximum length */
if (base == -1) {
return PANDAS_DATETIME_MAX_ISO8601_STRLEN;
}
switch (base) {
/* Generic units can only be used to represent NaT */
/*case PANDAS_FR_GENERIC:*/
/* return 4;*/
case PANDAS_FR_as:
len += 3; /* "###" */
case PANDAS_FR_fs:
len += 3; /* "###" */
case PANDAS_FR_ps:
len += 3; /* "###" */
case PANDAS_FR_ns:
len += 3; /* "###" */
case PANDAS_FR_us:
len += 3; /* "###" */
case PANDAS_FR_ms:
len += 4; /* ".###" */
case PANDAS_FR_s:
len += 3; /* ":##" */
case PANDAS_FR_m:
len += 3; /* ":##" */
case PANDAS_FR_h:
len += 3; /* "T##" */
case PANDAS_FR_D:
case PANDAS_FR_W:
len += 3; /* "-##" */
case PANDAS_FR_M:
len += 3; /* "-##" */
case PANDAS_FR_Y:
len += 21; /* 64-bit year */
break;
default:
len += 3; /* handle the now defunct NPY_FR_B */
break;
}
if (base >= PANDAS_FR_h) {
if (local) {
len += 5; /* "+####" or "-####" */
}
else {
len += 1; /* "Z" */
}
}
len += 1; /* NULL terminator */
return len;
}
/*
* Finds the largest unit whose value is nonzero, and for which
* the remainder for the rest of the units is zero.
*/
static PANDAS_DATETIMEUNIT
lossless_unit_from_datetimestruct(pandas_datetimestruct *dts)
{
if (dts->as % 1000 != 0) {
return PANDAS_FR_as;
}
else if (dts->as != 0) {
return PANDAS_FR_fs;
}
else if (dts->ps % 1000 != 0) {
return PANDAS_FR_ps;
}
else if (dts->ps != 0) {
return PANDAS_FR_ns;
}
else if (dts->us % 1000 != 0) {
return PANDAS_FR_us;
}
else if (dts->us != 0) {
return PANDAS_FR_ms;
}
else if (dts->sec != 0) {
return PANDAS_FR_s;
}
else if (dts->min != 0) {
return PANDAS_FR_m;
}
else if (dts->hour != 0) {