diff options
Diffstat (limited to 'Objects/floatobject.c')
| -rw-r--r-- | Objects/floatobject.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/Objects/floatobject.c b/Objects/floatobject.c index 5f42ca5..ca05f0d 100644 --- a/Objects/floatobject.c +++ b/Objects/floatobject.c @@ -1159,6 +1159,7 @@ float_as_integer_ratio(PyObject *v, PyObject *unused) double self; double float_part; int exponent; + int i; PyObject *prev; PyObject *py_exponent = NULL; @@ -1198,16 +1199,21 @@ float_as_integer_ratio(PyObject *v, PyObject *unused) float_part = frexp(self, &exponent); /* self == float_part * 2**exponent exactly */ PyFPE_END_PROTECT(float_part); - while (float_part != floor(float_part)) { + for (i=0; i<300 && float_part != floor(float_part) ; i++) { float_part *= 2.0; exponent--; } - /* Now, self == float_part * 2**exponent exactly and float_part is integral */ + if (i == 300) { + /* Could not convert mantissa to an integer */ + Py_INCREF(Py_NotImplemented); + return Py_NotImplemented; + } + /* self == float_part * 2**exponent exactly and float_part is integral */ numerator = PyLong_FromDouble(float_part); if (numerator == NULL) goto error; - /* now self = numerator * 2**exponent exactly; fold in 2**exponent */ + /* fold in 2**exponent */ denominator = PyLong_FromLong(1); py_exponent = PyLong_FromLong(labs((long)exponent)); if (py_exponent == NULL) goto error; @@ -1216,8 +1222,7 @@ float_as_integer_ratio(PyObject *v, PyObject *unused) if (py_exponent == NULL) goto error; if (exponent > 0) { INPLACE_UPDATE(numerator, - long_methods->nb_multiply(numerator, - py_exponent)); + long_methods->nb_multiply(numerator, py_exponent)); if (numerator == NULL) goto error; } else { |