Function PyArray_ToString

numpy/core/src/multiarray/convert.c:323–382

NUMPY_API*/

/*NUMPY_API*/
NPY_NO_EXPORT PyObject *
PyArray_ToString(PyArrayObject *self, NPY_ORDER order)
{
    npy_intp numbytes;
    npy_intp i;
    char *dptr;
    int elsize;
    PyObject *ret;
    PyArrayIterObject *it;

    if (order == NPY_ANYORDER)
        order = PyArray_ISFORTRAN(self) ? NPY_FORTRANORDER : NPY_CORDER;

    /*        if (PyArray_TYPE(self) == NPY_OBJECT) {
              PyErr_SetString(PyExc_ValueError, "a string for the data" \
              "in an object array is not appropriate");
              return NULL;
              }
    */

    numbytes = PyArray_NBYTES(self);
    if ((PyArray_IS_C_CONTIGUOUS(self) && (order == NPY_CORDER))
        || (PyArray_IS_F_CONTIGUOUS(self) && (order == NPY_FORTRANORDER))) {
        ret = PyBytes_FromStringAndSize(PyArray_DATA(self), (Py_ssize_t) numbytes);
    }
    else {
        PyObject *new;
        if (order == NPY_FORTRANORDER) {
            /* iterators are always in C-order */
            new = PyArray_Transpose(self, NULL);
            if (new == NULL) {
                return NULL;
            }
        }
        else {
            Py_INCREF(self);
            new = (PyObject *)self;
        }
        it = (PyArrayIterObject *)PyArray_IterNew(new);
        Py_DECREF(new);
        if (it == NULL) {
            return NULL;
        }
        ret = PyBytes_FromStringAndSize(NULL, (Py_ssize_t) numbytes);
        if (ret == NULL) {
            Py_DECREF(it);
            return NULL;
        }
        dptr = PyBytes_AS_STRING(ret);
        i = it->size;
        elsize = PyArray_DESCR(self)->elsize;
        while (i--) {
            memcpy(dptr, it->dataptr, elsize);
            dptr += elsize;
            PyArray_ITER_NEXT(it);
        }
        Py_DECREF(it);
    }