175 	if (uhp->uh_next.ptr != exp_uh_next)  in u_check_tree()
179 					       exp_uh_next, uhp->uh_next.ptr);  in u_check_tree()
181 	if (uhp->uh_alt_prev.ptr != exp_uh_alt_prev)  in u_check_tree()
185 				       exp_uh_alt_prev, uhp->uh_alt_prev.ptr);  in u_check_tree()
199 	u_check_tree(uhp->uh_alt_next.ptr, uhp->uh_next.ptr, uhp);  in u_check_tree()
202 	u_check_tree(uhp->uh_prev.ptr, uhp, NULL);  in u_check_tree()
528 	    curbuf->b_u_newhead = old_curhead->uh_next.ptr;  in u_savecommon()
543 	    else if (uhfree->uh_alt_next.ptr == NULL)  in u_savecommon()
549 		while (uhfree->uh_alt_next.ptr != NULL)  in u_savecommon()
550 		    uhfree = uhfree->uh_alt_next.ptr;  in u_savecommon()
566 	uhp->uh_prev.ptr = NULL;  in u_savecommon()
567 	uhp->uh_next.ptr = curbuf->b_u_newhead;  in u_savecommon()
568 	uhp->uh_alt_next.ptr = old_curhead;  in u_savecommon()
571 	    uhp->uh_alt_prev.ptr = old_curhead->uh_alt_prev.ptr;  in u_savecommon()
572 	    if (uhp->uh_alt_prev.ptr != NULL)  in u_savecommon()
573 		uhp->uh_alt_prev.ptr->uh_alt_next.ptr = uhp;  in u_savecommon()
574 	    old_curhead->uh_alt_prev.ptr = uhp;  in u_savecommon()
579 	    uhp->uh_alt_prev.ptr = NULL;  in u_savecommon()
581 	    curbuf->b_u_newhead->uh_prev.ptr = uhp;  in u_savecommon()
928 undo_write(bufinfo_T *bi, char_u *ptr, size_t len)  in undo_write()  argument
934 	char_u  *p = ptr;  in undo_write()
955     if (fwrite(ptr, len, (size_t)1, bi->bi_fp) != 1)  in undo_write()
982 fwrite_crypt(bufinfo_T *bi, char_u *ptr, size_t len)  in fwrite_crypt()  argument
1002 	crypt_encode(bi->bi_state, ptr, len, copy, TRUE);  in fwrite_crypt()
1009     return undo_write(bi, ptr, len);  in fwrite_crypt()
1169     char_u  *ptr = alloc(len + 1);  in read_string_decrypt()  local
1171     if (ptr != NULL)  in read_string_decrypt()
1173 	if (len > 0 && undo_read(bi, ptr, len) == FAIL)  in read_string_decrypt()
1175 	    vim_free(ptr);  in read_string_decrypt()
1180 	ptr[len] = NUL;  in read_string_decrypt()
1183 	    crypt_decode_inplace(bi->bi_state, ptr, len, FALSE);  in read_string_decrypt()
1186     return ptr;  in read_string_decrypt()
1290     put_header_ptr(bi, uhp->uh_next.ptr);  in serialize_uhp()
1291     put_header_ptr(bi, uhp->uh_prev.ptr);  in serialize_uhp()
1292     put_header_ptr(bi, uhp->uh_alt_next.ptr);  in serialize_uhp()
1293     put_header_ptr(bi, uhp->uh_alt_prev.ptr);  in serialize_uhp()
1760 	if (uhp->uh_prev.ptr != NULL && uhp->uh_prev.ptr->uh_walk != mark)  in u_write_undo()
1761 	    uhp = uhp->uh_prev.ptr;  in u_write_undo()
1762 	else if (uhp->uh_alt_next.ptr != NULL  in u_write_undo()
1763 				     && uhp->uh_alt_next.ptr->uh_walk != mark)  in u_write_undo()
1764 	    uhp = uhp->uh_alt_next.ptr;  in u_write_undo()
1765 	else if (uhp->uh_next.ptr != NULL && uhp->uh_alt_prev.ptr == NULL  in u_write_undo()
1766 					 && uhp->uh_next.ptr->uh_walk != mark)  in u_write_undo()
1767 	    uhp = uhp->uh_next.ptr;  in u_write_undo()
1768 	else if (uhp->uh_alt_prev.ptr != NULL)  in u_write_undo()
1769 	    uhp = uhp->uh_alt_prev.ptr;  in u_write_undo()
1771 	    uhp = uhp->uh_next.ptr;  in u_write_undo()
2094 		uhp->uh_next.ptr = uhp_table[j];  in u_read_undo()
2102 		uhp->uh_prev.ptr = uhp_table[j];  in u_read_undo()
2110 		uhp->uh_alt_next.ptr = uhp_table[j];  in u_read_undo()
2118 		uhp->uh_alt_prev.ptr = uhp_table[j];  in u_read_undo()
2262 		curbuf->b_u_curhead = curbuf->b_u_curhead->uh_next.ptr;  in u_doit()
2296 	    if (curbuf->b_u_curhead->uh_prev.ptr == NULL)  in u_doit()
2298 	    curbuf->b_u_curhead = curbuf->b_u_curhead->uh_prev.ptr;  in u_doit()
2364 		    uhp = uhp->uh_next.ptr;  in undo_time()
2489 	    if (uhp->uh_prev.ptr != NULL && uhp->uh_prev.ptr->uh_walk != nomark  in undo_time()
2490 					 && uhp->uh_prev.ptr->uh_walk != mark)  in undo_time()
2491 		uhp = uhp->uh_prev.ptr;  in undo_time()
2494 	    else if (uhp->uh_alt_next.ptr != NULL  in undo_time()
2495 		    && uhp->uh_alt_next.ptr->uh_walk != nomark  in undo_time()
2496 		    && uhp->uh_alt_next.ptr->uh_walk != mark)  in undo_time()
2497 		uhp = uhp->uh_alt_next.ptr;  in undo_time()
2501 	    else if (uhp->uh_next.ptr != NULL && uhp->uh_alt_prev.ptr == NULL  in undo_time()
2502 		    && uhp->uh_next.ptr->uh_walk != nomark  in undo_time()
2503 		    && uhp->uh_next.ptr->uh_walk != mark)  in undo_time()
2508 		uhp = uhp->uh_next.ptr;  in undo_time()
2515 		if (uhp->uh_alt_prev.ptr != NULL)  in undo_time()
2516 		    uhp = uhp->uh_alt_prev.ptr;  in undo_time()
2518 		    uhp = uhp->uh_next.ptr;  in undo_time()
2563 		uhp = uhp->uh_next.ptr;  in undo_time()
2589 		while (uhp->uh_alt_prev.ptr != NULL  in undo_time()
2590 				     && uhp->uh_alt_prev.ptr->uh_walk == mark)  in undo_time()
2591 		    uhp = uhp->uh_alt_prev.ptr;  in undo_time()
2595 		while (last->uh_alt_next.ptr != NULL  in undo_time()
2596 				    && last->uh_alt_next.ptr->uh_walk == mark)  in undo_time()
2597 		    last = last->uh_alt_next.ptr;  in undo_time()
2602 		    while (uhp->uh_alt_prev.ptr != NULL)  in undo_time()
2603 			uhp = uhp->uh_alt_prev.ptr;  in undo_time()
2604 		    if (last->uh_alt_next.ptr != NULL)  in undo_time()
2605 			last->uh_alt_next.ptr->uh_alt_prev.ptr =  in undo_time()
2606 							last->uh_alt_prev.ptr;  in undo_time()
2607 		    last->uh_alt_prev.ptr->uh_alt_next.ptr =  in undo_time()
2608 							last->uh_alt_next.ptr;  in undo_time()
2609 		    last->uh_alt_prev.ptr = NULL;  in undo_time()
2610 		    last->uh_alt_next.ptr = uhp;  in undo_time()
2611 		    uhp->uh_alt_prev.ptr = last;  in undo_time()
2616 		    if (uhp->uh_next.ptr != NULL)  in undo_time()
2617 			uhp->uh_next.ptr->uh_prev.ptr = uhp;  in undo_time()
2636 		if (uhp->uh_prev.ptr == NULL)  in undo_time()
2638 		curbuf->b_u_curhead = uhp->uh_prev.ptr;  in undo_time()
2644 		uhp = uhp->uh_prev.ptr;  in undo_time()
2936 	if (curhead->uh_next.ptr != NULL)  in u_undoredo()
2937 	    curbuf->b_u_seq_cur = curhead->uh_next.ptr->uh_seq;  in u_undoredo()
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()
3016 	    uhp = curbuf->b_u_curhead->uh_next.ptr;  in u_undo_end()
3094 	if (uhp->uh_prev.ptr == NULL && uhp->uh_walk != nomark  in ex_undolist()
3116 	if (uhp->uh_prev.ptr != NULL && uhp->uh_prev.ptr->uh_walk != nomark  in ex_undolist()
3117 					 && uhp->uh_prev.ptr->uh_walk != mark)  in ex_undolist()
3119 	    uhp = uhp->uh_prev.ptr;  in ex_undolist()
3124 	else if (uhp->uh_alt_next.ptr != NULL  in ex_undolist()
3125 		&& uhp->uh_alt_next.ptr->uh_walk != nomark  in ex_undolist()
3126 		&& uhp->uh_alt_next.ptr->uh_walk != mark)  in ex_undolist()
3127 	    uhp = uhp->uh_alt_next.ptr;  in ex_undolist()
3131 	else if (uhp->uh_next.ptr != NULL && uhp->uh_alt_prev.ptr == NULL  in ex_undolist()
3132 		&& uhp->uh_next.ptr->uh_walk != nomark  in ex_undolist()
3133 		&& uhp->uh_next.ptr->uh_walk != mark)  in ex_undolist()
3135 	    uhp = uhp->uh_next.ptr;  in ex_undolist()
3143 	    if (uhp->uh_alt_prev.ptr != NULL)  in ex_undolist()
3144 		uhp = uhp->uh_alt_prev.ptr;  in ex_undolist()
3147 		uhp = uhp->uh_next.ptr;  in ex_undolist()
3261 	uhp = uhp->uh_next.ptr;  in u_update_save_nr()
3273     for (uh = uhp; uh != NULL; uh = uh->uh_prev.ptr)  in u_unch_branch()
3276 	if (uh->uh_alt_next.ptr != NULL)  in u_unch_branch()
3277 	    u_unch_branch(uh->uh_alt_next.ptr);	    // recursive  in u_unch_branch()
3348     if (uhp->uh_alt_next.ptr != NULL)  in u_freeheader()
3349 	u_freebranch(buf, uhp->uh_alt_next.ptr, uhpp);  in u_freeheader()
3351     if (uhp->uh_alt_prev.ptr != NULL)  in u_freeheader()
3352 	uhp->uh_alt_prev.ptr->uh_alt_next.ptr = NULL;  in u_freeheader()
3355     if (uhp->uh_next.ptr == NULL)  in u_freeheader()
3356 	buf->b_u_oldhead = uhp->uh_prev.ptr;  in u_freeheader()
3358 	uhp->uh_next.ptr->uh_prev.ptr = uhp->uh_prev.ptr;  in u_freeheader()
3360     if (uhp->uh_prev.ptr == NULL)  in u_freeheader()
3361 	buf->b_u_newhead = uhp->uh_next.ptr;  in u_freeheader()
3363 	for (uhap = uhp->uh_prev.ptr; uhap != NULL;  in u_freeheader()
3364 						 uhap = uhap->uh_alt_next.ptr)  in u_freeheader()
3365 	    uhap->uh_next.ptr = uhp->uh_next.ptr;  in u_freeheader()
3390     if (uhp->uh_alt_prev.ptr != NULL)  in u_freebranch()
3391 	uhp->uh_alt_prev.ptr->uh_alt_next.ptr = NULL;  in u_freebranch()
3397 	if (tofree->uh_alt_next.ptr != NULL)  in u_freebranch()
3398 	    u_freebranch(buf, tofree->uh_alt_next.ptr, uhpp);   // recursive  in u_freebranch()
3399 	next = tofree->uh_prev.ptr;  in u_freebranch()
3631 	if (uhp->uh_alt_next.ptr != NULL)  in u_eval_tree()
3638 		u_eval_tree(uhp->uh_alt_next.ptr, alt_list);  in u_eval_tree()
3644 	uhp = uhp->uh_prev.ptr;  in u_eval_tree()