Refactor multiplication and division of timedelta and float. (#3656)

Implementations of these operations are virtually identical.

Modules/_datetimemodule.c

@@ -1677,8 +1677,9 @@ get_float_as_integer_ratio(PyObject *floatobj)
     return ratio;
 }
 
+/* op is 0 for multiplication, 1 for division */
 static PyObject *
-multiply_float_timedelta(PyObject *floatobj, PyDateTime_Delta *delta)
+multiply_truedivide_timedelta_float(PyDateTime_Delta *delta, PyObject *floatobj, int op)
 {
     PyObject *result = NULL;
     PyObject *pyus_in = NULL, *temp, *pyus_out;
@@ -1691,12 +1692,12 @@ multiply_float_timedelta(PyObject *floatobj, PyDateTime_Delta *delta)
     if (ratio == NULL) {
         goto error;
     }
-    temp = PyNumber_Multiply(pyus_in, PyTuple_GET_ITEM(ratio, 0));
+    temp = PyNumber_Multiply(pyus_in, PyTuple_GET_ITEM(ratio, op));
     Py_DECREF(pyus_in);
     pyus_in = NULL;
     if (temp == NULL)
         goto error;
-    pyus_out = divide_nearest(temp, PyTuple_GET_ITEM(ratio, 1));
+    pyus_out = divide_nearest(temp, PyTuple_GET_ITEM(ratio, !op));
     Py_DECREF(temp);
     if (pyus_out == NULL)
         goto error;
@@ -1776,38 +1777,6 @@ truedivide_timedelta_timedelta(PyDateTime_Delta *left, PyDateTime_Delta *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 = get_float_as_integer_ratio(f);
-    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)
 {
@@ -1958,15 +1927,15 @@ delta_multiply(PyObject *left, PyObject *right)
             result = multiply_int_timedelta(right,
                             (PyDateTime_Delta *) left);
         else if (PyFloat_Check(right))
-            result = multiply_float_timedelta(right,
-                            (PyDateTime_Delta *) left);
+            result = multiply_truedivide_timedelta_float(
+                            (PyDateTime_Delta *) left, right, 0);
     }
     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);
+        result = multiply_truedivide_timedelta_float(
+                        (PyDateTime_Delta *) right, left, 0);
 
     if (result == Py_NotImplemented)
         Py_INCREF(result);
@@ -2006,8 +1975,8 @@ delta_truedivide(PyObject *left, PyObject *right)
                             (PyDateTime_Delta *)left,
                             (PyDateTime_Delta *)right);
         else if (PyFloat_Check(right))
-            result = truedivide_timedelta_float(
-                            (PyDateTime_Delta *)left, right);
+            result = multiply_truedivide_timedelta_float(
+                            (PyDateTime_Delta *)left, right, 1);
         else if (PyLong_Check(right))
             result = truedivide_timedelta_int(
                             (PyDateTime_Delta *)left, right);