xmlStrncat(xmlChar *cur, const xmlChar *add, int len) {
    int size;
    xmlChar *ret;

    if ((add == NULL) || (len == 0))
        return(cur);
    if (len < 0)
	return(NULL);
    if (cur == NULL)
        return(xmlStrndup(add, len));

    size = xmlStrlen(cur);
    ret = (xmlChar *) xmlRealloc(cur, (size + len + 1) * sizeof(xmlChar));
    if (ret == NULL) {
        xmlErrMemory(NULL, NULL);
        return(cur);
    }
    memcpy(&ret[size], add, len * sizeof(xmlChar));
    ret[size + len] = 0;
    return(ret);
}
Unknown