python/Objects/complexobject.c at master · CodeLiyoung/python · GitHub

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/* Complex object implementation */

/* Borrows heavily from floatobject.c */

/* Submitted by Jim Hugunin */

#include "Python.h"

#include "structmember.h"

#ifdef HAVE_IEEEFP_H

#include <ieeefp.h>

#endif

#ifndef WITHOUT_COMPLEX

/* Precisions used by repr() and str(), respectively.

The repr() precision (17 significant decimal digits) is the minimal number

that is guaranteed to have enough precision so that if the number is read

back in the exact same binary value is recreated. This is true for IEEE

floating point by design, and also happens to work for all other modern

hardware.

The str() precision is chosen so that in most cases, the rounding noise

created by various operations is suppressed, while giving plenty of

precision for practical use.

#define PREC_REPR 17

#define PREC_STR 12

/* elementary operations on complex numbers */

static Py_complex c_1 = {1., 0.};

Py_complex

c_sum(Py_complex a, Py_complex b)

{

Py_complex r;

r.real = a.real + b.real;

r.imag = a.imag + b.imag;

return r;

}

Py_complex

c_diff(Py_complex a, Py_complex b)

{

Py_complex r;

r.real = a.real - b.real;

r.imag = a.imag - b.imag;

return r;

}

Py_complex

c_neg(Py_complex a)

{

Py_complex r;

r.real = -a.real;

r.imag = -a.imag;

return r;

}

Py_complex

c_prod(Py_complex a, Py_complex b)

{

Py_complex r;

r.real = a.real*b.real - a.imag*b.imag;

r.imag = a.real*b.imag + a.imag*b.real;

return r;

}

Py_complex

c_quot(Py_complex a, Py_complex b)

{

/******************************************************************

This was the original algorithm. It's grossly prone to spurious

overflow and underflow errors. It also merrily divides by 0 despite

checking for that(!). The code still serves a doc purpose here, as

the algorithm following is a simple by-cases transformation of this

one:

Py_complex r;

double d = b.real*b.real + b.imag*b.imag;

if (d == 0.)

errno = EDOM;

r.real = (a.real*b.real + a.imag*b.imag)/d;

r.imag = (a.imag*b.real - a.real*b.imag)/d;

return r;

******************************************************************/

/* This algorithm is better, and is pretty obvious: first divide the

* numerators and denominator by whichever of {b.real, b.imag} has

* larger magnitude. The earliest reference I found was to CACM

* Algorithm 116 (Complex Division, Robert L. Smith, Stanford

* University). As usual, though, we're still ignoring all IEEE

* endcases.

Py_complex r; /* the result */

const double abs_breal = b.real < 0 ? -b.real : b.real;

const double abs_bimag = b.imag < 0 ? -b.imag : b.imag;

if (abs_breal >= abs_bimag) {

/* divide tops and bottom by b.real */

if (abs_breal == 0.0) {

errno = EDOM;

r.real = r.imag = 0.0;

}

else {

const double ratio = b.imag / b.real;

const double denom = b.real + b.imag * ratio;

r.real = (a.real + a.imag * ratio) / denom;

r.imag = (a.imag - a.real * ratio) / denom;

}

else {

/* divide tops and bottom by b.imag */

const double ratio = b.real / b.imag;

const double denom = b.real * ratio + b.imag;

assert(b.imag != 0.0);

r.real = (a.real * ratio + a.imag) / denom;

r.imag = (a.imag * ratio - a.real) / denom;

}

return r;

}

Py_complex

c_pow(Py_complex a, Py_complex b)

{

Py_complex r;

double vabs,len,at,phase;

if (b.real == 0. && b.imag == 0.) {

r.real = 1.;

r.imag = 0.;

}

else if (a.real == 0. && a.imag == 0.) {

if (b.imag != 0. || b.real < 0.)

errno = EDOM;

r.real = 0.;

r.imag = 0.;

}

else {

vabs = hypot(a.real,a.imag);

len = pow(vabs,b.real);

at = atan2(a.imag, a.real);

phase = at*b.real;

if (b.imag != 0.0) {

len /= exp(at*b.imag);

phase += b.imag*log(vabs);

}

r.real = len*cos(phase);

r.imag = len*sin(phase);

}

return r;

}

static Py_complex

c_powu(Py_complex x, long n)

{

Py_complex r, p;

long mask = 1;

r = c_1;

p = x;

while (mask > 0 && n >= mask) {

if (n & mask)

r = c_prod(r,p);

mask <<= 1;

p = c_prod(p,p);

}

return r;

}

static Py_complex

c_powi(Py_complex x, long n)

{

Py_complex cn;

if (n > 100 || n < -100) {

cn.real = (double) n;

cn.imag = 0.;

return c_pow(x,cn);

}

else if (n > 0)

return c_powu(x,n);

else

return c_quot(c_1,c_powu(x,-n));

}

double

c_abs(Py_complex z)

{

/* sets errno = ERANGE on overflow; otherwise errno = 0 */

double result;

if (!Py_IS_FINITE(z.real) || !Py_IS_FINITE(z.imag)) {

/* C99 rules: if either the real or the imaginary part is an

infinity, return infinity, even if the other part is a

NaN. */

if (Py_IS_INFINITY(z.real)) {

result = fabs(z.real);

errno = 0;

return result;

}

if (Py_IS_INFINITY(z.imag)) {

result = fabs(z.imag);

errno = 0;

return result;

}

/* either the real or imaginary part is a NaN,

and neither is infinite. Result should be NaN. */

return Py_NAN;

}

result = hypot(z.real, z.imag);

if (!Py_IS_FINITE(result))

errno = ERANGE;

else

errno = 0;

return result;

}

static PyObject *

complex_subtype_from_c_complex(PyTypeObject *type, Py_complex cval)

{

PyObject *op;

op = type->tp_alloc(type, 0);

if (op != NULL)

((PyComplexObject *)op)->cval = cval;

return op;

}

PyObject *

PyComplex_FromCComplex(Py_complex cval)

{

/* Inline PyObject_New */

op = (PyComplexObject *) PyObject_MALLOC(sizeof(PyComplexObject));

if (op == NULL)

return PyErr_NoMemory();

PyObject_INIT(op, &PyComplex_Type);

op->cval = cval;

return (PyObject *) op;

}

static PyObject *

complex_subtype_from_doubles(PyTypeObject *type, double real, double imag)

{

Py_complex c;

c.real = real;

c.imag = imag;

return complex_subtype_from_c_complex(type, c);

}

PyObject *

PyComplex_FromDoubles(double real, double imag)

{

Py_complex c;

c.real = real;

c.imag = imag;

return PyComplex_FromCComplex(c);

}

double

PyComplex_RealAsDouble(PyObject *op)

{

if (PyComplex_Check(op)) {

return ((PyComplexObject *)op)->cval.real;

}

else {

return PyFloat_AsDouble(op);

}

double

PyComplex_ImagAsDouble(PyObject *op)

{

if (PyComplex_Check(op)) {

return ((PyComplexObject *)op)->cval.imag;

}

else {

return 0.0;

}

Py_complex

PyComplex_AsCComplex(PyObject *op)

{

Py_complex cv;

PyObject *newop = NULL;

static PyObject *complex_str = NULL;

assert(op);

/* If op is already of type PyComplex_Type, return its value */

if (PyComplex_Check(op)) {

return ((PyComplexObject *)op)->cval;

}

/* If not, use op's __complex__ method, if it exists */

/* return -1 on failure */

cv.real = -1.;

cv.imag = 0.;

if (complex_str == NULL) {

if (!(complex_str = PyString_InternFromString("__complex__")))

return cv;

}

if (PyInstance_Check(op)) {

/* this can go away in python 3000 */

if (PyObject_HasAttr(op, complex_str)) {

newop = PyObject_CallMethod(op, "__complex__", NULL);

if (!newop)

return cv;

}

/* else try __float__ */

} else {

PyObject *complexfunc;

complexfunc = _PyType_Lookup(op->ob_type, complex_str);

/* complexfunc is a borrowed reference */

if (complexfunc) {

newop = PyObject_CallFunctionObjArgs(complexfunc, op, NULL);

if (!newop)

return cv;

}

if (newop) {

if (!PyComplex_Check(newop)) {

PyErr_SetString(PyExc_TypeError,

"__complex__ should return a complex object");

Py_DECREF(newop);

return cv;

}

cv = ((PyComplexObject *)newop)->cval;

Py_DECREF(newop);

return cv;

}

/* If neither of the above works, interpret op as a float giving the

real part of the result, and fill in the imaginary part as 0. */

else {

/* PyFloat_AsDouble will return -1 on failure */

cv.real = PyFloat_AsDouble(op);

return cv;

}

static void

complex_dealloc(PyObject *op)

{

op->ob_type->tp_free(op);

}

static void

complex_to_buf(char *buf, int bufsz, PyComplexObject *v, int precision)

{

char format[32];

if (v->cval.real == 0.) {

if (!Py_IS_FINITE(v->cval.imag)) {

if (Py_IS_NAN(v->cval.imag))

strncpy(buf, "nan*j", 6);

else if (copysign(1, v->cval.imag) == 1)

strncpy(buf, "inf*j", 6);

else

strncpy(buf, "-inf*j", 7);

}

else {

PyOS_snprintf(format, sizeof(format), "%%.%ig", precision);

PyOS_ascii_formatd(buf, bufsz - 1, format, v->cval.imag);

strncat(buf, "j", 1);

}

} else {

char re[64], im[64];

/* Format imaginary part with sign, real part without */

if (!Py_IS_FINITE(v->cval.real)) {

if (Py_IS_NAN(v->cval.real))

strncpy(re, "nan", 4);

/* else if (copysign(1, v->cval.real) == 1) */

else if (v->cval.real > 0)

strncpy(re, "inf", 4);

else

strncpy(re, "-inf", 5);

}

else {

PyOS_snprintf(format, sizeof(format), "%%.%ig", precision);

PyOS_ascii_formatd(re, sizeof(re), format, v->cval.real);

}

if (!Py_IS_FINITE(v->cval.imag)) {

if (Py_IS_NAN(v->cval.imag))

strncpy(im, "+nan*", 6);

/* else if (copysign(1, v->cval.imag) == 1) */

else if (v->cval.imag > 0)

strncpy(im, "+inf*", 6);

else

strncpy(im, "-inf*", 6);

}

else {

PyOS_snprintf(format, sizeof(format), "%%+.%ig", precision);

PyOS_ascii_formatd(im, sizeof(im), format, v->cval.imag);

}

PyOS_snprintf(buf, bufsz, "(%s%sj)", re, im);

}

static int

complex_print(PyComplexObject *v, FILE *fp, int flags)

{

char buf[100];

complex_to_buf(buf, sizeof(buf), v,

(flags & Py_PRINT_RAW) ? PREC_STR : PREC_REPR);

Py_BEGIN_ALLOW_THREADS

fputs(buf, fp);

Py_END_ALLOW_THREADS

return 0;

}

static PyObject *

complex_repr(PyComplexObject *v)

{

char buf[100];

complex_to_buf(buf, sizeof(buf), v, PREC_REPR);

return PyString_FromString(buf);

}

static PyObject *

complex_str(PyComplexObject *v)

{

char buf[100];

complex_to_buf(buf, sizeof(buf), v, PREC_STR);

return PyString_FromString(buf);

}

static long

complex_hash(PyComplexObject *v)

{

long hashreal, hashimag, combined;

hashreal = _Py_HashDouble(v->cval.real);

if (hashreal == -1)

return -1;

hashimag = _Py_HashDouble(v->cval.imag);

if (hashimag == -1)

return -1;

/* Note: if the imaginary part is 0, hashimag is 0 now,

* so the following returns hashreal unchanged. This is

* important because numbers of different types that

* compare equal must have the same hash value, so that

* hash(x + 0*j) must equal hash(x).

combined = hashreal + 1000003 * hashimag;

if (combined == -1)

combined = -2;

return combined;

}

/* This macro may return! */

#define TO_COMPLEX(obj, c) \

if (PyComplex_Check(obj)) \

c = ((PyComplexObject *)(obj))->cval; \

else if (to_complex(&(obj), &(c)) < 0) \

return (obj)

static int

to_complex(PyObject **pobj, Py_complex *pc)

{

PyObject *obj = *pobj;

pc->real = pc->imag = 0.0;

if (PyInt_Check(obj)) {

pc->real = PyInt_AS_LONG(obj);

return 0;

}

if (PyLong_Check(obj)) {

pc->real = PyLong_AsDouble(obj);

if (pc->real == -1.0 && PyErr_Occurred()) {

*pobj = NULL;

return -1;

}

return 0;

}

if (PyFloat_Check(obj)) {

pc->real = PyFloat_AsDouble(obj);

return 0;

}

Py_INCREF(Py_NotImplemented);

*pobj = Py_NotImplemented;

return -1;

}

static PyObject *

complex_add(PyComplexObject *v, PyComplexObject *w)

{

Py_complex result;

PyFPE_START_PROTECT("complex_add", return 0)

result = c_sum(v->cval,w->cval);

PyFPE_END_PROTECT(result)

return PyComplex_FromCComplex(result);

}

static PyObject *

complex_sub(PyComplexObject *v, PyComplexObject *w)

{

Py_complex result;

PyFPE_START_PROTECT("complex_sub", return 0)

result = c_diff(v->cval,w->cval);

PyFPE_END_PROTECT(result)

return PyComplex_FromCComplex(result);

}

static PyObject *

complex_mul(PyComplexObject *v, PyComplexObject *w)

{

Py_complex result;

PyFPE_START_PROTECT("complex_mul", return 0)

result = c_prod(v->cval,w->cval);

PyFPE_END_PROTECT(result)

return PyComplex_FromCComplex(result);

}

static PyObject *

complex_div(PyComplexObject *v, PyComplexObject *w)

{

Py_complex quot;

PyFPE_START_PROTECT("complex_div", return 0)

errno = 0;

quot = c_quot(v->cval,w->cval);

PyFPE_END_PROTECT(quot)

if (errno == EDOM) {

PyErr_SetString(PyExc_ZeroDivisionError, "complex division");

return NULL;

}

return PyComplex_FromCComplex(quot);

}

static PyObject *

complex_classic_div(PyComplexObject *v, PyComplexObject *w)

{

Py_complex quot;

if (Py_DivisionWarningFlag >= 2 &&

PyErr_Warn(PyExc_DeprecationWarning,

"classic complex division") < 0)

return NULL;

PyFPE_START_PROTECT("complex_classic_div", return 0)

errno = 0;

quot = c_quot(v->cval,w->cval);

PyFPE_END_PROTECT(quot)

if (errno == EDOM) {

PyErr_SetString(PyExc_ZeroDivisionError, "complex division");

return NULL;

}

return PyComplex_FromCComplex(quot);

}

static PyObject *

complex_remainder(PyComplexObject *v, PyComplexObject *w)

{

Py_complex div, mod;

if (PyErr_Warn(PyExc_DeprecationWarning,

"complex divmod(), // and % are deprecated") < 0)

return NULL;

errno = 0;

div = c_quot(v->cval,w->cval); /* The raw divisor value. */

if (errno == EDOM) {

PyErr_SetString(PyExc_ZeroDivisionError, "complex remainder");

return NULL;

}

div.real = floor(div.real); /* Use the floor of the real part. */

div.imag = 0.0;

mod = c_diff(v->cval, c_prod(w->cval, div));

return PyComplex_FromCComplex(mod);

}

static PyObject *

complex_divmod(PyComplexObject *v, PyComplexObject *w)

{

Py_complex div, mod;

PyObject *d, *m, *z;

if (PyErr_Warn(PyExc_DeprecationWarning,

"complex divmod(), // and % are deprecated") < 0)

return NULL;

errno = 0;

div = c_quot(v->cval,w->cval); /* The raw divisor value. */

if (errno == EDOM) {

PyErr_SetString(PyExc_ZeroDivisionError, "complex divmod()");

return NULL;

}

div.real = floor(div.real); /* Use the floor of the real part. */

div.imag = 0.0;

mod = c_diff(v->cval, c_prod(w->cval, div));

d = PyComplex_FromCComplex(div);

m = PyComplex_FromCComplex(mod);

z = PyTuple_Pack(2, d, m);

Py_XDECREF(d);

Py_XDECREF(m);

return z;

}

static PyObject *

complex_pow(PyObject *v, PyObject *w, PyObject *z)

{

Py_complex p;

Py_complex exponent;

long int_exponent;

Py_complex a, b;

TO_COMPLEX(v, a);

TO_COMPLEX(w, b);

if (z!=Py_None) {

PyErr_SetString(PyExc_ValueError, "complex modulo");

return NULL;

}

PyFPE_START_PROTECT("complex_pow", return 0)

errno = 0;

exponent = b;

int_exponent = (long)exponent.real;

if (exponent.imag == 0. && exponent.real == int_exponent)

p = c_powi(a,int_exponent);

else

p = c_pow(a,exponent);

PyFPE_END_PROTECT(p)

Py_ADJUST_ERANGE2(p.real, p.imag);

if (errno == EDOM) {

PyErr_SetString(PyExc_ZeroDivisionError,

"0.0 to a negative or complex power");

return NULL;

}

else if (errno == ERANGE) {

PyErr_SetString(PyExc_OverflowError,

"complex exponentiation");

return NULL;

}

return PyComplex_FromCComplex(p);

}

static PyObject *

complex_int_div(PyComplexObject *v, PyComplexObject *w)

{

PyObject *t, *r;

if (PyErr_Warn(PyExc_DeprecationWarning,

"complex divmod(), // and % are deprecated") < 0)

return NULL;

t = complex_divmod(v, w);

if (t != NULL) {

r = PyTuple_GET_ITEM(t, 0);

Py_INCREF(r);

Py_DECREF(t);

return r;

}

return NULL;

}

static PyObject *

complex_neg(PyComplexObject *v)

{

Py_complex neg;

neg.real = -v->cval.real;

neg.imag = -v->cval.imag;

return PyComplex_FromCComplex(neg);

}

static PyObject *

complex_pos(PyComplexObject *v)

{

if (PyComplex_CheckExact(v)) {

Py_INCREF(v);

return (PyObject *)v;

}

else

return PyComplex_FromCComplex(v->cval);

}

static PyObject *

complex_abs(PyComplexObject *v)

{

double result;

PyFPE_START_PROTECT("complex_abs", return 0)

result = c_abs(v->cval);

PyFPE_END_PROTECT(result)

if (errno == ERANGE) {

PyErr_SetString(PyExc_OverflowError,

"absolute value too large");

return NULL;

}

return PyFloat_FromDouble(result);

}

static int

complex_nonzero(PyComplexObject *v)

{

return v->cval.real != 0.0 || v->cval.imag != 0.0;

}

static int

complex_coerce(PyObject **pv, PyObject **pw)

{

Py_complex cval;

cval.imag = 0.;

if (PyInt_Check(*pw)) {

cval.real = (double)PyInt_AsLong(*pw);

*pw = PyComplex_FromCComplex(cval);

Py_INCREF(*pv);

return 0;

}

else if (PyLong_Check(*pw)) {

cval.real = PyLong_AsDouble(*pw);

if (cval.real == -1.0 && PyErr_Occurred())

return -1;

*pw = PyComplex_FromCComplex(cval);

Py_INCREF(*pv);

return 0;

}

else if (PyFloat_Check(*pw)) {

cval.real = PyFloat_AsDouble(*pw);

*pw = PyComplex_FromCComplex(cval);

Py_INCREF(*pv);

return 0;

}

else if (PyComplex_Check(*pw)) {

Py_INCREF(*pv);

Py_INCREF(*pw);

return 0;

}

return 1; /* Can't do it */

}

static PyObject *

complex_richcompare(PyObject *v, PyObject *w, int op)

{

int c;

Py_complex i, j;

PyObject *res;

c = PyNumber_CoerceEx(&v, &w);

if (c < 0)

return NULL;

if (c > 0) {

Py_INCREF(Py_NotImplemented);

return Py_NotImplemented;

}

/* Make sure both arguments are complex. */

if (!(PyComplex_Check(v) && PyComplex_Check(w))) {

Py_DECREF(v);

Py_DECREF(w);

Py_INCREF(Py_NotImplemented);

return Py_NotImplemented;

}

i = ((PyComplexObject *)v)->cval;

j = ((PyComplexObject *)w)->cval;

Py_DECREF(v);

Py_DECREF(w);

if (op != Py_EQ && op != Py_NE) {

PyErr_SetString(PyExc_TypeError,

"no ordering relation is defined for complex numbers");

return NULL;

}

if ((i.real == j.real && i.imag == j.imag) == (op == Py_EQ))

res = Py_True;

else

res = Py_False;

Py_INCREF(res);

return res;

}

static PyObject *

complex_int(PyObject *v)

{

PyErr_SetString(PyExc_TypeError,

"can't convert complex to int; use int(abs(z))");

return NULL;

}

static PyObject *

complex_long(PyObject *v)

{

PyErr_SetString(PyExc_TypeError,

"can't convert complex to long; use long(abs(z))");

return NULL;

}

static PyObject *

complex_float(PyObject *v)

{

PyErr_SetString(PyExc_TypeError,

"can't convert complex to float; use abs(z)");

return NULL;

}

static PyObject *

complex_conjugate(PyObject *self)

{

Py_complex c;

c = ((PyComplexObject *)self)->cval;

c.imag = -c.imag;

return PyComplex_FromCComplex(c);

}

PyDoc_STRVAR(complex_conjugate_doc,

"complex.conjugate() -> complex\n"

"\n"

"Returns the complex conjugate of its argument. (3-4j).conjugate() == 3+4j.");

static PyObject *

complex_getnewargs(PyComplexObject *v)

{

Py_complex c = v->cval;

return Py_BuildValue("(dd)", c.real, c.imag);

}

#if 0

static PyObject *

complex_is_finite(PyObject *self)

{

Py_complex c;

c = ((PyComplexObject *)self)->cval;

return PyBool_FromLong((long)(Py_IS_FINITE(c.real) &&

Py_IS_FINITE(c.imag)));

}

PyDoc_STRVAR(complex_is_finite_doc,

"complex.is_finite() -> bool\n"

"\n"

"Returns True if the real and the imaginary part is finite.");

#endif

static PyMethodDef complex_methods[] = {

{"conjugate", (PyCFunction)complex_conjugate, METH_NOARGS,

complex_conjugate_doc},

#if 0

{"is_finite", (PyCFunction)complex_is_finite, METH_NOARGS,

complex_is_finite_doc},

#endif

{"__getnewargs__", (PyCFunction)complex_getnewargs, METH_NOARGS},

{NULL, NULL} /* sentinel */

};

static PyMemberDef complex_members[] = {

{"real", T_DOUBLE, offsetof(PyComplexObject, cval.real), READONLY,

"the real part of a complex number"},

{"imag", T_DOUBLE, offsetof(PyComplexObject, cval.imag), READONLY,

"the imaginary part of a complex number"},

{0},

};

static PyObject *

complex_subtype_from_string(PyTypeObject *type, PyObject *v)

{

const char *s, *start;

char *end;

double x=0.0, y=0.0, z;

int got_re=0, got_im=0, got_bracket=0, done=0;

int digit_or_dot;

int sw_error=0;

int sign;

char buffer[256]; /* For errors */

#ifdef Py_USING_UNICODE

char s_buffer[256];

#endif

Py_ssize_t len;

if (PyString_Check(v)) {

s = PyString_AS_STRING(v);

len = PyString_GET_SIZE(v);

}

#ifdef Py_USING_UNICODE

else if (PyUnicode_Check(v)) {

if (PyUnicode_GET_SIZE(v) >= (Py_ssize_t)sizeof(s_buffer)) {

PyErr_SetString(PyExc_ValueError,

"complex() literal too large to convert");

return NULL;

}

if (PyUnicode_EncodeDecimal(PyUnicode_AS_UNICODE(v),

PyUnicode_GET_SIZE(v),

s_buffer,

NULL))

return NULL;

s = s_buffer;

len = strlen(s);

}

#endif

else if (PyObject_AsCharBuffer(v, &s, &len)) {

PyErr_SetString(PyExc_TypeError,

"complex() arg is not a string");

return NULL;

}

/* position on first nonblank */

start = s;

while (*s && isspace(Py_CHARMASK(*s)))

s++;

if (s[0] == '\0') {

PyErr_SetString(PyExc_ValueError,

"complex() arg is an empty string");

return NULL;

}

if (s[0] == '(') {

/* Skip over possible bracket from repr(). */

got_bracket = 1;

s++;

while (*s && isspace(Py_CHARMASK(*s)))

s++;

}

z = -1.0;

sign = 1;

do {

switch (*s) {

case '\0':

if (s-start != len) {

PyErr_SetString(

PyExc_ValueError,

"complex() arg contains a null byte");

return NULL;

}

if(!done) sw_error=1;

break;

case ')':

if (!got_bracket || !(got_re || got_im)) {

sw_error=1;

break;

}

got_bracket=0;

done=1;

s++;

while (*s && isspace(Py_CHARMASK(*s)))

s++;

if (*s) sw_error=1;

break;

case '-':

sign = -1;

/* Fallthrough */

case '+':

if (done) sw_error=1;

s++;

if ( *s=='\0'||*s=='+'||*s=='-'||*s==')'||

isspace(Py_CHARMASK(*s)) ) sw_error=1;

break;

case 'J':

case 'j':

if (got_im || done) {

sw_error = 1;

break;

}

if (z<0.0) {

y=sign;

}

else{

y=sign*z;

}

got_im=1;

s++;

if (*s!='+' && *s!='-' )

done=1;

break;

default:

if (isspace(Py_CHARMASK(*s))) {

while (*s && isspace(Py_CHARMASK(*s)))

s++;

if (*s && *s != ')')

sw_error=1;

else

done = 1;

break;

}

digit_or_dot =

(*s=='.' || isdigit(Py_CHARMASK(*s)));

if (done||!digit_or_dot) {

sw_error=1;

break;

}

errno = 0;

PyFPE_START_PROTECT("strtod", return 0)

z = PyOS_ascii_strtod(s, &end) ;

PyFPE_END_PROTECT(z)

if (errno != 0) {

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python/Objects/complexobject.c at master · CodeLiyoung/python · GitHub

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