Function parse_datetime_metadata_from_metastr

numpy/core/src/multiarray/datetime.c:803–858

* Parses the metadata string into the metadata C structure. * * Returns 0 on success, -1 on failure. */

 * Returns 0 on success, -1 on failure.
 */
NPY_NO_EXPORT int
parse_datetime_metadata_from_metastr(char const *metastr, Py_ssize_t len,
                                    PyArray_DatetimeMetaData *out_meta)
{
    char const *substr = metastr, *substrend = NULL;

    /* Treat the empty string as generic units */
    if (len == 0) {
        out_meta->base = NPY_FR_GENERIC;
        out_meta->num = 1;

        return 0;
    }

    /* The metadata string must start with a '[' */
    if (len < 3 || *substr++ != '[') {
        goto bad_input;
    }

    substrend = substr;
    while (substrend - metastr < len && *substrend != ']') {
        ++substrend;
    }
    if (substrend - metastr == len || substr == substrend) {
        substr = substrend;
        goto bad_input;
    }

    /* Parse the extended unit inside the [] */
    if (parse_datetime_extended_unit_from_string(substr, substrend-substr,
                                                    metastr, out_meta) < 0) {
        return -1;
    }

    substr = substrend+1;

    if (substr - metastr != len) {
        goto bad_input;
    }

    return 0;

bad_input:
    if (substr != metastr) {
        PyErr_Format(PyExc_TypeError,
                "Invalid datetime metadata string \"%s\" at position %zd",
                metastr, substr - metastr);
    }
    else {
        PyErr_Format(PyExc_TypeError,
                "Invalid datetime metadata string \"%s\"",
                metastr);
    }

    return -1;
}

/*