159     if (uhp == curbuf->b_u_curhead && ++seen_b_u_curhead > 1)  in u_check_tree()
164     if (uhp == curbuf->b_u_newhead && ++seen_b_u_newhead > 1)  in u_check_tree()
213     u_check_tree(curbuf->b_u_oldhead, NULL, NULL);  in u_check()
215     if (seen_b_u_newhead == 0 && curbuf->b_u_oldhead != NULL  in u_check()
216 	    && !(newhead_may_be_NULL && curbuf->b_u_newhead == NULL))  in u_check()
217 	semsg("b_u_newhead invalid: 0x%x", curbuf->b_u_newhead);  in u_check()
218     if (curbuf->b_u_curhead != NULL && seen_b_u_curhead == 0)  in u_check()
219 	semsg("b_u_curhead invalid: 0x%x", curbuf->b_u_curhead);  in u_check()
220     if (header_count != curbuf->b_u_numhead)  in u_check()
224 			       (long)header_count, (long)curbuf->b_u_numhead);  in u_check()
253     if (top >= bot || bot > curbuf->b_ml.ml_line_count + 1)  in u_save()
306 		     nlines == curbuf->b_ml.ml_line_count ? 2 : lnum, FALSE));  in u_savedel()
317     if (!curbuf->b_p_ma)  in undo_allowed()
349     if (curbuf->b_p_ul == NO_LOCAL_UNDOLEVEL)  in get_undolevel()
351     return curbuf->b_p_ul;  in get_undolevel()
363     if (curbuf->b_ml.ml_line_len == 0)  in u_save_line()
372 	ul->ul_len = curbuf->b_ml.ml_line_len;  in u_save_line()
387     int	    proplen = get_text_props(curbuf, lnum, &props, FALSE);  in has_prop_w_flags()
444 	    if (curbuf->b_p_ro)  in u_savecommon()
463 	if (bot > curbuf->b_ml.ml_line_count + 1)  in u_savecommon()
483 	if (bot <= curbuf->b_ml.ml_line_count  in u_savecommon()
498     if (curbuf->b_u_synced)  in u_savecommon()
502 	curbuf->b_new_change = TRUE;  in u_savecommon()
525 	old_curhead = curbuf->b_u_curhead;  in u_savecommon()
528 	    curbuf->b_u_newhead = old_curhead->uh_next.ptr;  in u_savecommon()
529 	    curbuf->b_u_curhead = NULL;  in u_savecommon()
535 	while (curbuf->b_u_numhead > get_undolevel()  in u_savecommon()
536 					       && curbuf->b_u_oldhead != NULL)  in u_savecommon()
538 	    u_header_T	    *uhfree = curbuf->b_u_oldhead;  in u_savecommon()
542 		u_freebranch(curbuf, uhfree, &old_curhead);  in u_savecommon()
545 		u_freeheader(curbuf, uhfree, &old_curhead);  in u_savecommon()
551 		u_freebranch(curbuf, uhfree, &old_curhead);  in u_savecommon()
561 		u_freebranch(curbuf, old_curhead, NULL);  in u_savecommon()
562 	    curbuf->b_u_synced = FALSE;  in u_savecommon()
567 	uhp->uh_next.ptr = curbuf->b_u_newhead;  in u_savecommon()
575 	    if (curbuf->b_u_oldhead == old_curhead)  in u_savecommon()
576 		curbuf->b_u_oldhead = uhp;  in u_savecommon()
580 	if (curbuf->b_u_newhead != NULL)  in u_savecommon()
581 	    curbuf->b_u_newhead->uh_prev.ptr = uhp;  in u_savecommon()
583 	uhp->uh_seq = ++curbuf->b_u_seq_last;  in u_savecommon()
584 	curbuf->b_u_seq_cur = uhp->uh_seq;  in u_savecommon()
587 	curbuf->b_u_time_cur = uhp->uh_time + 1;  in u_savecommon()
599 	uhp->uh_flags = (curbuf->b_changed ? UH_CHANGED : 0) +  in u_savecommon()
600 		       ((curbuf->b_ml.ml_flags & ML_EMPTY) ? UH_EMPTYBUF : 0);  in u_savecommon()
603 	mch_memmove(uhp->uh_namedm, curbuf->b_namedm, sizeof(pos_T) * NMARKS);  in u_savecommon()
604 	uhp->uh_visual = curbuf->b_visual;  in u_savecommon()
606 	curbuf->b_u_newhead = uhp;  in u_savecommon()
607 	if (curbuf->b_u_oldhead == NULL)  in u_savecommon()
608 	    curbuf->b_u_oldhead = uhp;  in u_savecommon()
609 	++curbuf->b_u_numhead;  in u_savecommon()
636 		if ((curbuf->b_u_newhead->uh_getbot_entry != uep  in u_savecommon()
639 				    ? curbuf->b_ml.ml_line_count + 1  in u_savecommon()
641 			    : uep->ue_lcount != curbuf->b_ml.ml_line_count)  in u_savecommon()
656 			curbuf->b_u_synced = FALSE;  in u_savecommon()
665 			uep->ue_next = curbuf->b_u_newhead->uh_entry;  in u_savecommon()
666 			curbuf->b_u_newhead->uh_entry = uep;  in u_savecommon()
672 		    else if (bot > curbuf->b_ml.ml_line_count)  in u_savecommon()
676 			uep->ue_lcount = curbuf->b_ml.ml_line_count;  in u_savecommon()
677 			curbuf->b_u_newhead->uh_getbot_entry = uep;  in u_savecommon()
718     else if (bot > curbuf->b_ml.ml_line_count)  in u_savecommon()
722 	uep->ue_lcount = curbuf->b_ml.ml_line_count;  in u_savecommon()
723 	curbuf->b_u_newhead->uh_getbot_entry = uep;  in u_savecommon()
750     uep->ue_next = curbuf->b_u_newhead->uh_entry;  in u_savecommon()
751     curbuf->b_u_newhead->uh_entry = uep;  in u_savecommon()
752     curbuf->b_u_synced = FALSE;  in u_savecommon()
802     for (lnum = 1; lnum <= curbuf->b_ml.ml_line_count; ++lnum)  in u_compute_hash()
1872 	file_name = u_get_undo_file_name(curbuf->b_ffname, TRUE);  in u_read_undo()
1912     bi.bi_buf = curbuf;  in u_read_undo()
1928 	if (*curbuf->b_p_key == NUL)  in u_read_undo()
1934 	bi.bi_state = crypt_create_from_file(fp, curbuf->b_p_key);  in u_read_undo()
1970 				  || line_count != curbuf->b_ml.ml_line_count)  in u_read_undo()
2141     u_blockfree(curbuf);  in u_read_undo()
2142     curbuf->b_u_oldhead = old_idx < 0 ? NULL : uhp_table[old_idx];  in u_read_undo()
2143     curbuf->b_u_newhead = new_idx < 0 ? NULL : uhp_table[new_idx];  in u_read_undo()
2144     curbuf->b_u_curhead = cur_idx < 0 ? NULL : uhp_table[cur_idx];  in u_read_undo()
2145     curbuf->b_u_line_ptr = line_ptr;  in u_read_undo()
2146     curbuf->b_u_line_lnum = line_lnum;  in u_read_undo()
2147     curbuf->b_u_line_colnr = line_colnr;  in u_read_undo()
2148     curbuf->b_u_numhead = num_head;  in u_read_undo()
2149     curbuf->b_u_seq_last = seq_last;  in u_read_undo()
2150     curbuf->b_u_seq_cur = seq_cur;  in u_read_undo()
2151     curbuf->b_u_time_cur = seq_time;  in u_read_undo()
2152     curbuf->b_u_save_nr_last = last_save_nr;  in u_read_undo()
2153     curbuf->b_u_save_nr_cur = last_save_nr;  in u_read_undo()
2155     curbuf->b_u_synced = TRUE;  in u_read_undo()
2208     if (curbuf->b_u_synced == FALSE)  in u_undo()
2246     if (curbuf->b_ml.ml_flags & ML_EMPTY)  in u_doit()
2258 	    if (curbuf->b_u_curhead == NULL)		// first undo  in u_doit()
2259 		curbuf->b_u_curhead = curbuf->b_u_newhead;  in u_doit()
2262 		curbuf->b_u_curhead = curbuf->b_u_curhead->uh_next.ptr;  in u_doit()
2264 	    if (curbuf->b_u_numhead == 0 || curbuf->b_u_curhead == NULL)  in u_doit()
2267 		curbuf->b_u_curhead = curbuf->b_u_oldhead;  in u_doit()
2281 	    if (curbuf->b_u_curhead == NULL || get_undolevel() <= 0)  in u_doit()
2296 	    if (curbuf->b_u_curhead->uh_prev.ptr == NULL)  in u_doit()
2297 		curbuf->b_u_newhead = curbuf->b_u_curhead;  in u_doit()
2298 	    curbuf->b_u_curhead = curbuf->b_u_curhead->uh_prev.ptr;  in u_doit()
2336     if (curbuf->b_u_synced == FALSE)  in undo_time()
2341     if (curbuf->b_ml.ml_flags & ML_EMPTY)  in undo_time()
2354 	    target = (long)(curbuf->b_u_time_cur) + step;  in undo_time()
2362 		uhp = curbuf->b_u_curhead;  in undo_time()
2366 		    uhp = curbuf->b_u_newhead;  in undo_time()
2370 		    target = curbuf->b_u_save_nr_cur + step;  in undo_time()
2373 		    target = curbuf->b_u_save_nr_cur + step + 1;  in undo_time()
2382 		target = curbuf->b_u_save_nr_cur + step;  in undo_time()
2383 		if (target > curbuf->b_u_save_nr_last)  in undo_time()
2387 		    target = curbuf->b_u_seq_last + 1;  in undo_time()
2393 	    target = curbuf->b_u_seq_cur + step;  in undo_time()
2405 		closest = curbuf->b_u_save_nr_last + 2;  in undo_time()
2407 		closest = curbuf->b_u_seq_last + 2;  in undo_time()
2413     closest_seq = curbuf->b_u_seq_cur;  in undo_time()
2439 	if (curbuf->b_u_curhead == NULL)	// at leaf of the tree  in undo_time()
2440 	    uhp = curbuf->b_u_newhead;  in undo_time()
2442 	    uhp = curbuf->b_u_curhead;  in undo_time()
2460 		if ((step < 0 ? uhp->uh_seq <= curbuf->b_u_seq_cur  in undo_time()
2461 			      : uhp->uh_seq > curbuf->b_u_seq_cur)  in undo_time()
2506 		if (uhp == curbuf->b_u_curhead)  in undo_time()
2559 	    uhp = curbuf->b_u_curhead;  in undo_time()
2561 		uhp = curbuf->b_u_newhead;  in undo_time()
2567 	    curbuf->b_u_curhead = uhp;  in undo_time()
2584 		uhp = curbuf->b_u_curhead;  in undo_time()
2613 		    if (curbuf->b_u_oldhead == uhp)  in undo_time()
2614 			curbuf->b_u_oldhead = last;  in undo_time()
2619 		curbuf->b_u_curhead = uhp;  in undo_time()
2628 		    curbuf->b_u_seq_cur = target - 1;  in undo_time()
2637 		    curbuf->b_u_newhead = uhp;  in undo_time()
2638 		curbuf->b_u_curhead = uhp->uh_prev.ptr;  in undo_time()
2684     u_header_T	*curhead = curbuf->b_u_curhead;  in u_undoredo()
2694     new_flags = (curbuf->b_changed ? UH_CHANGED : 0) +  in u_undoredo()
2695 	       ((curbuf->b_ml.ml_flags & ML_EMPTY) ? UH_EMPTYBUF : 0);  in u_undoredo()
2701     mch_memmove(namedm, curbuf->b_namedm, sizeof(pos_T) * NMARKS);  in u_undoredo()
2702     visualinfo = curbuf->b_visual;  in u_undoredo()
2703     curbuf->b_op_start.lnum = curbuf->b_ml.ml_line_count;  in u_undoredo()
2704     curbuf->b_op_start.col = 0;  in u_undoredo()
2705     curbuf->b_op_end.lnum = 0;  in u_undoredo()
2706     curbuf->b_op_end.col = 0;  in u_undoredo()
2713 	    bot = curbuf->b_ml.ml_line_count + 1;  in u_undoredo()
2714 	if (top > curbuf->b_ml.ml_line_count || top >= bot  in u_undoredo()
2715 				      || bot > curbuf->b_ml.ml_line_count + 1)  in u_undoredo()
2748 		    if (curbuf->b_ml.ml_line_len != uep->ue_array[i].ul_len  in u_undoredo()
2750 						curbuf->b_ml.ml_line_len) != 0)  in u_undoredo()
2795 		if (curbuf->b_ml.ml_line_count == 1)  in u_undoredo()
2831 	    if (curbuf->b_op_start.lnum > top + oldsize)  in u_undoredo()
2832 		curbuf->b_op_start.lnum += newsize - oldsize;  in u_undoredo()
2833 	    if (curbuf->b_op_end.lnum > top + oldsize)  in u_undoredo()
2834 		curbuf->b_op_end.lnum += newsize - oldsize;  in u_undoredo()
2840 	if (top + 1 < curbuf->b_op_start.lnum)  in u_undoredo()
2841 	    curbuf->b_op_start.lnum = top + 1;  in u_undoredo()
2842 	if (newsize == 0 && top + 1 > curbuf->b_op_end.lnum)  in u_undoredo()
2843 	    curbuf->b_op_end.lnum = top + 1;  in u_undoredo()
2844 	else if (top + newsize > curbuf->b_op_end.lnum)  in u_undoredo()
2845 	    curbuf->b_op_end.lnum = top + newsize;  in u_undoredo()
2868 	curbuf->b_ml.ml_flags |= ML_EMPTY;  in u_undoredo()
2874 	if (!isNetbeansModified(curbuf))  in u_undoredo()
2876 	unchanged(curbuf, FALSE, TRUE);  in u_undoredo()
2884 	    curbuf->b_namedm[i] = curhead->uh_namedm[i];  in u_undoredo()
2892 	curbuf->b_visual = curhead->uh_visual;  in u_undoredo()
2904     if (curwin->w_cursor.lnum <= curbuf->b_ml.ml_line_count)  in u_undoredo()
2931     curbuf->b_u_seq_cur = curhead->uh_seq;  in u_undoredo()
2937 	    curbuf->b_u_seq_cur = curhead->uh_next.ptr->uh_seq;  in u_undoredo()
2939 	    curbuf->b_u_seq_cur = 0;  in u_undoredo()
2946 	    curbuf->b_u_save_nr_cur = curhead->uh_save_nr - 1;  in u_undoredo()
2948 	    curbuf->b_u_save_nr_cur = curhead->uh_save_nr;  in u_undoredo()
2953     curbuf->b_u_time_cur = curhead->uh_time;  in u_undoredo()
2984     if (curbuf->b_ml.ml_flags & ML_EMPTY)  in u_undo_end()
3005     if (curbuf->b_u_curhead != NULL)  in u_undo_end()
3008 	if (absolute && curbuf->b_u_curhead->uh_next.ptr != NULL)  in u_undo_end()
3010 	    uhp = curbuf->b_u_curhead->uh_next.ptr;  in u_undo_end()
3014 	    uhp = curbuf->b_u_curhead;  in u_undo_end()
3016 	    uhp = curbuf->b_u_curhead->uh_next.ptr;  in u_undo_end()
3019 	uhp = curbuf->b_u_newhead;  in u_undo_end()
3032 	    if (wp->w_buffer == curbuf && wp->w_p_cole > 0)  in u_undo_end()
3054     if (curbuf->b_u_synced || (!force && no_u_sync > 0))  in u_sync()
3061 	curbuf->b_u_synced = TRUE;  // no entries, nothing to do  in u_sync()
3065 	curbuf->b_u_curhead = NULL;  in u_sync()
3091     uhp = curbuf->b_u_oldhead;  in ex_undolist()
3181     if (curbuf->b_u_newhead == NULL)  in ex_undojoin()
3183     if (curbuf->b_u_curhead != NULL)  in ex_undojoin()
3188     if (!curbuf->b_u_synced)  in ex_undojoin()
3194 	curbuf->b_u_synced = FALSE;  in ex_undojoin()
3215     u_header_T	*uhp = curbuf->b_u_newhead;  in u_find_first_changed()
3219     if (curbuf->b_u_curhead != NULL || uhp == NULL)  in u_find_first_changed()
3227     for (lnum = 1; lnum < curbuf->b_ml.ml_line_count  in u_find_first_changed()
3230 	char_u *p = ml_get_buf(curbuf, lnum, FALSE);  in u_find_first_changed()
3232 	if (uep->ue_array[lnum - 1].ul_len != curbuf->b_ml.ml_line_len  in u_find_first_changed()
3240     if (curbuf->b_ml.ml_line_count != uep->ue_size)  in u_find_first_changed()
3288     if (curbuf->b_u_newhead == NULL || curbuf->b_u_newhead->uh_entry == NULL)  in u_get_headentry()
3293     return curbuf->b_u_newhead->uh_entry;  in u_get_headentry()
3310     uep = curbuf->b_u_newhead->uh_getbot_entry;  in u_getbot()
3318 	extra = curbuf->b_ml.ml_line_count - uep->ue_lcount;  in u_getbot()
3320 	if (uep->ue_bot < 1 || uep->ue_bot > curbuf->b_ml.ml_line_count)  in u_getbot()
3329 	curbuf->b_u_newhead->uh_getbot_entry = NULL;  in u_getbot()
3332     curbuf->b_u_synced = TRUE;  in u_getbot()
3472     if (lnum == curbuf->b_u_line_lnum)	    // line is already saved  in u_saveline()
3474     if (lnum < 1 || lnum > curbuf->b_ml.ml_line_count) // should never happen  in u_saveline()
3477     curbuf->b_u_line_lnum = lnum;  in u_saveline()
3479 	curbuf->b_u_line_colnr = curwin->w_cursor.col;  in u_saveline()
3481 	curbuf->b_u_line_colnr = 0;  in u_saveline()
3482     if (u_save_line(&curbuf->b_u_line_ptr, lnum) == FAIL)  in u_saveline()
3493     if (curbuf->b_u_line_ptr.ul_line != NULL)  in u_clearline()
3495 	VIM_CLEAR(curbuf->b_u_line_ptr.ul_line);  in u_clearline()
3496 	curbuf->b_u_line_ptr.ul_len = 0;  in u_clearline()
3497 	curbuf->b_u_line_lnum = 0;  in u_clearline()
3516     if (curbuf->b_u_line_ptr.ul_line == NULL  in u_undoline()
3517 			|| curbuf->b_u_line_lnum > curbuf->b_ml.ml_line_count)  in u_undoline()
3524     if (u_savecommon(curbuf->b_u_line_lnum - 1,  in u_undoline()
3525 		       curbuf->b_u_line_lnum + 1, (linenr_T)0, FALSE) == FAIL)  in u_undoline()
3527     if (u_save_line(&oldp, curbuf->b_u_line_lnum) == FAIL)  in u_undoline()
3532     ml_replace_len(curbuf->b_u_line_lnum, curbuf->b_u_line_ptr.ul_line,  in u_undoline()
3533 				     curbuf->b_u_line_ptr.ul_len, TRUE, FALSE);  in u_undoline()
3534     changed_bytes(curbuf->b_u_line_lnum, 0);  in u_undoline()
3535     curbuf->b_u_line_ptr = oldp;  in u_undoline()
3537     t = curbuf->b_u_line_colnr;  in u_undoline()
3538     if (curwin->w_cursor.lnum == curbuf->b_u_line_lnum)  in u_undoline()
3539 	curbuf->b_u_line_colnr = curwin->w_cursor.col;  in u_undoline()
3541     curwin->w_cursor.lnum = curbuf->b_u_line_lnum;  in u_undoline()
3602     return bufIsChanged(curbuf);  in curbufIsChanged()
3624 	if (uhp == curbuf->b_u_newhead)  in u_eval_tree()
3626 	if (uhp == curbuf->b_u_curhead)  in u_eval_tree()
3714 	dict_add_number(dict, "synced", (long)curbuf->b_u_synced);  in f_undotree()
3715 	dict_add_number(dict, "seq_last", curbuf->b_u_seq_last);  in f_undotree()
3716 	dict_add_number(dict, "save_last", (long)curbuf->b_u_save_nr_last);  in f_undotree()
3717 	dict_add_number(dict, "seq_cur", curbuf->b_u_seq_cur);  in f_undotree()
3718 	dict_add_number(dict, "time_cur", (long)curbuf->b_u_time_cur);  in f_undotree()
3719 	dict_add_number(dict, "save_cur", (long)curbuf->b_u_save_nr_cur);  in f_undotree()
3724 	    u_eval_tree(curbuf->b_u_oldhead, list);  in f_undotree()