Function _convert_from_str

numpy/core/src/multiarray/descriptor.c:1724–1884

Convert a bytestring specification into a dtype */

/** Convert a bytestring specification into a dtype */
static PyArray_Descr *
_convert_from_str(PyObject *obj, int align)
{
    /* Check for a string typecode. */
    Py_ssize_t len = 0;
    char const *type = PyUnicode_AsUTF8AndSize(obj, &len);
    if (type == NULL) {
        return NULL;
    }

    /* Empty string is invalid */
    if (len == 0) {
        goto fail;
    }

    /* check for commas present or first (or second) element a digit */
    if (_check_for_commastring(type, len)) {
        return _convert_from_commastring(obj, align);
    }

    /* Process the endian character. '|' is replaced by '='*/
    char endian = '=';
    switch (type[0]) {
        case '>':
        case '<':
        case '=':
            endian = type[0];
            ++type;
            --len;
            break;

        case '|':
            endian = '=';
            ++type;
            --len;
            break;
    }

    /* Just an endian character is invalid */
    if (len == 0) {
        goto fail;
    }

    /* Check for datetime format */
    if (is_datetime_typestr(type, len)) {
        PyArray_Descr *ret = parse_dtype_from_datetime_typestr(type, len);
        if (ret == NULL) {
            return NULL;
        }
        /* ret has byte order '=' at this point */
        if (!PyArray_ISNBO(endian)) {
            ret->byteorder = endian;
        }
        return ret;
    }

    int check_num = NPY_NOTYPE + 10;
    int elsize = 0;