int
log_line(SCR *sp, db_recno_t lno, u_int action)
{
        DBT data, key;
        EXF *ep;
        size_t len;
        CHAR_T *lp;
        db_recno_t lcur;  
   
        ep = sp->ep;
        if (F_ISSET(ep, F_NOLOG))
                return (0);
                        
        /*
         * XXX
         *
         * Kluge for vi.  Clear the EXF undo flag so that the
         * next 'u' command does a roll-back, regardless.
         */
        F_CLR(ep, F_UNDO);
        /* Put out one initial cursor record per set of changes. */
        if (ep->l_cursor.lno != OOBLNO) {
                if (log_cursor1(sp, LOG_CURSOR_INIT))
                        return (1);
                ep->l_cursor.lno = OOBLNO;
                ep->l_win = sp->wp;
        } /*else if (ep->l_win != sp->wp) {
                printf("log_line own: %p, this: %p\n", ep->l_win, sp->wp);
                return 1;
        }*/
                                                                                                                                                             
        switch (action) {
        /* newly added for DB4 logging */
        case LOG_LINE_APPEND_B:
        case LOG_LINE_DELETE_F:
                return 0;
        }

        /*
         * Put out the changes.  If it's a LOG_LINE_RESET_B call, it's a
         * special case, avoid the caches.  Also, if it fails and it's
         * line 1, it just means that the user started with an empty file,                                                                                   
         * so fake an empty length line.
         */
        if (action == LOG_LINE_RESET_B) {
                if (db_get(sp, lno, DBG_NOCACHE, &lp, &len)) {
                        static CHAR_T nul = 0;
                        if (lno != 1) {
                                db_err(sp, lno);
                                return (1);
                        }
                        len = 0;
                        lp = &nul;                                                                                                                           
                }
        } else
                if (db_get(sp, lno, DBG_FATAL, &lp, &len))
                        return (1);
        BINC_RETC(sp,
            sp->wp->l_lp, sp->wp->l_len,
            len * sizeof(CHAR_T) + CHAR_T_OFFSET);    //// <-- HERE
        sp->wp->l_lp[0] = action;
        memmove(sp->wp->l_lp + sizeof(u_char), &lno, sizeof(db_recno_t));
        MEMMOVEW(sp->wp->l_lp + CHAR_T_OFFSET, lp, len);

/public/src.git/external/bsd/nvi/dist/common/log1.c:301:2: runtime error: member access within null pointer of type 'log_t'