diff options
Diffstat (limited to 'Objects/longobject.c')
| -rw-r--r-- | Objects/longobject.c | 25 |
1 files changed, 17 insertions, 8 deletions
diff --git a/Objects/longobject.c b/Objects/longobject.c index 7a04f1e..2279fc3 100644 --- a/Objects/longobject.c +++ b/Objects/longobject.c @@ -260,25 +260,34 @@ PyLong_AsUnsignedLong(PyObject *vv) return x; } +int +_PyLong_Sign(PyObject *vv) +{ + PyLongObject *v = (PyLongObject *)vv; + const int ndigits = v->ob_size; + + assert(v != NULL); + assert(PyLong_Check(v)); + assert(ndigits == 0 || v->ob_digit[ndigits - 1] != 0); + + return ndigits == 0 ? 0 : (ndigits < 0 ? -1 : 1); +} + size_t _PyLong_NumBits(PyObject *vv) { PyLongObject *v = (PyLongObject *)vv; - size_t result = 1; /* for the sign bit */ - size_t ndigits = ABS(v->ob_size); + size_t result = 0; + int ndigits = ABS(v->ob_size); assert(v != NULL); assert(PyLong_Check(v)); assert(ndigits == 0 || v->ob_digit[ndigits - 1] != 0); if (ndigits > 0) { - size_t product; digit msd = v->ob_digit[ndigits - 1]; - product = (ndigits - 1) * SHIFT; - if (product / SHIFT != ndigits - 1) - goto Overflow; - result += product; - if (result < product) + result = (ndigits - 1) * SHIFT; + if (result / SHIFT != ndigits - 1) goto Overflow; do { ++result; |