Function _append_field_name

numpy/core/src/multiarray/buffer.c:96–133

* Append a PEP3118-formatted field name, ":name:", to str */

 * Append a PEP3118-formatted field name, ":name:", to str
 */
static int
_append_field_name(_tmp_string_t *str, PyObject *name)
{
    int ret = -1;
    char *p;
    Py_ssize_t len;
    PyObject *tmp;
    /* FIXME: XXX -- should it use UTF-8 here? */
    tmp = PyUnicode_AsUTF8String(name);
    if (tmp == NULL || PyBytes_AsStringAndSize(tmp, &p, &len) < 0) {
        PyErr_Clear();
        PyErr_SetString(PyExc_ValueError, "invalid field name");
        goto fail;
    }
    if (_append_char(str, ':') < 0) {
        goto fail;
    }
    while (len > 0) {
        if (*p == ':') {
            PyErr_SetString(PyExc_ValueError,
                            "':' is not an allowed character in buffer "
                            "field names");
            goto fail;
        }
        if (_append_char(str, *p) < 0) {
            goto fail;
        }
        ++p;
        --len;
    }
    if (_append_char(str, ':') < 0) {
        goto fail;
    }
    ret = 0;
fail:
    Py_XDECREF(tmp);
    return ret;
}

/*
 * Return non-zero if a type is aligned in each item in the given array,