rem: return Ns_DStringNAppend(dsPtr, string, strlen(string) + 1);
add: return Ns_DStringNAppend(dsPtr, string, (int)strlen(string) + 1);
context: Ns_DStringAppendArg(Ns_DString *dsPtr, char *string){    return Ns_DStringNAppend(dsPtr, string, strlen(string) + 1);}