rem: int len;  len = TO_START_L + _uri->len + TO_END_L + CRLF_L;  if (*_l < len) {
add: if (_l < (TO_START_L + _uri->len + TO_END_L + CRLF_L)) {
context: int lpidf_add_presentity(str* _b, int* _l, str* _uri){	int len;	len = TO_START_L + _uri->len + TO_END_L + CRLF_L;	if (*_l < len) {		paerrno = PA_SMALL_BUFFER;		LOG(L_ERR, "lpidf_add_presentity(): Buffer too small\n");		*_l = len - *_l;		return -1;	}	str_append(_b, TO_START, TO_START_L);	str_append(_b, _uri->s, _uri->len);	str_append(_b, TO_END CRLF, TO_END_L + CRLF_L);	return 0;}