rcs_errno = RCS_ERR_ERRNO;
rcs_growbuf(RCSFILE *rf){	void *tmp;	struct rcs_pdata *pdp = (struct rcs_pdata *)rf->rf_pdata;	tmp = realloc(pdp->rp_buf, pdp->rp_blen + RCS_BUFEXTSIZE);	if (tmp == NULL) {		cvs_log(LP_ERRNO, "failed to grow RCS parse buffer");		return (-1);	}	pdp->rp_buf = (char *)tmp;	pdp->rp_blen += RCS_BUFEXTSIZE;	pdp->rp_bufend = pdp->rp_buf + pdp->rp_blen - 1;	return (0);}