214 		&& *get_vim_var_str(VV_CHAR) == NUL  in edit()
250     if (cmdchar != NUL && restart_edit == 0)  in edit()
369 		&& *(ptr = ml_get_curline() + curwin->w_cursor.col) != NUL)  in edit()
371 	    if (ptr[1] == NUL)  in edit()
376 		if (ptr[i] == NUL)  in edit()
499 	    cmdchar_todo = NUL;  in edit()
634 			&& (c = ins_compl_bs()) == NUL)  in edit()
662 			for (p = str; *p != NUL; MB_PTR_ADV(p))  in edit()
831 	    if (ins_at_eol && gchar_cursor() == NUL)  in edit()
899 	case NUL:  in edit()
903 	    if (stuff_inserted(NUL, 1L, (c == Ctrl_A)) == FAIL  in edit()
1228 	    if (c == NUL)  in edit()
1271 	    if (*curbuf->b_p_cpt == NUL  in edit()
1313 		    if (*str != NUL && stop_arrow() != FAIL)  in edit()
1316 			for (p = str; *p != NUL; MB_PTR_ADV(p))  in edit()
1327 		    c = NUL;  in edit()
1332 		if (c == NUL)  in edit()
1801     line[i + 1] = NUL;  in truncate_spaces()
1847 	if (*ml_get_cursor() == NUL || curwin->w_cursor.col == ecol)  in del_char_after_col()
2014 	    p[len - 1] = NUL;  in insert_special()
2083 			&& *ml_get_cursor() != NUL)  in insertchar()
2096 				  + char2cells(c != NUL ? c : gchar_cursor());  in insertchar()
2098 	if (*curbuf->b_p_fex != NUL && (flags & INSCHAR_NO_FEX) == 0  in insertchar()
2108 	    internal_format(textwidth, second_indent, flags, c == NUL, c);  in insertchar()
2111     if (c == NUL)	    // only formatting was wanted  in insertchar()
2163     end_comment_pending = NUL;  in insertchar()
2190 	    && vpeekc() != NUL  in insertchar()
2217 	while (	   (c = vpeekc()) != NUL  in insertchar()
2239 	buf[i] = NUL;  in insertchar()
2248 	if (buf[i] != NUL)  in insertchar()
2260 	    buf[cc] = NUL;  in insertchar()
2451 	    if (curwin->w_cursor.col > 0 && gchar_cursor() == NUL)  in stop_insert()
2463 		if (gchar_cursor() != NUL)  in stop_insert()
2467 		if (gchar_cursor() == NUL  in stop_insert()
2492 		if (gchar_cursor() == NUL && curwin->w_cursor.col > 0)  in stop_insert()
2507 		if (cc != NUL && gchar_pos(&tpos) == NUL)  in stop_insert()
2561 	*s++ = NUL;  in set_last_insert()
2633 			       && !((flags & BL_FIX) && ptr[1] == NUL); ++ptr)  in beginline()
2670     if (*ptr == NUL)  in oneright()
2680     if (ptr[l] == NUL && (get_ve_flags() & VE_ONEMORE) == 0)  in oneright()
2710 	    if ((*get_showbreak_value(curwin) == NUL && !curwin->w_p_bri  in oneleft()
2876     char_u	last = NUL;  in stuff_inserted()
2886     if (c != NUL)  in stuff_inserted()
2889 	*esc_ptr = NUL;	    // remove the ESC  in stuff_inserted()
2899 	*last_ptr = NUL;  in stuff_inserted()
2951 	    s[len - 1] = NUL;  in get_last_insert_save()
3069 	if (replace_stack[i] == NUL && off-- <= 0)  in replace_join()
3417     if (regname == NUL || !valid_yank_reg(regname, FALSE))  in ins_reg()
3647     if (restart_edit == NUL && (colnr_T)temp == curwin->w_cursor.col)  in ins_esc()
3661 	    && (restart_edit == NUL  in ins_esc()
3662 		   || (gchar_cursor() == NUL && !VIsual_active))  in ins_esc()
3671 	    if (restart_edit != NUL)  in ins_esc()
3720     if (reg_recording != 0 || restart_edit != NUL)  in ins_esc()
3738 	while (gchar_cursor() != NUL && revins_chars--)  in ins_ctrl_()
3803 		    buf[3] = NUL;  in ins_start_select()
3852 	ins_at_eol = (gchar_cursor() == NUL);  in ins_ctrl_o()
3887     if (did_ai && *skipwhite(ml_get_curline()) != NUL)  in ins_shift()
3906     if (gchar_cursor() == NUL)		// delete newline  in ins_del()
4008     end_comment_pending = NUL;	// After BS, don't auto-end comment  in ins_bs()
4087 			ptr[len - 1] = NUL;  in ins_bs()
4091 		if (temp == NUL && gchar_cursor() != NUL)  in ins_bs()
4224 			replace_push(NUL);  in ins_bs()
4292 		    if (enc_utf8 && p_deco && cpc[0] != NUL)  in ins_bs()
4300 		    if (revins_on && gchar_cursor() == NUL)  in ins_bs()
4388 	if (end == NULL && vpeekc() == NUL)  in bracketed_paste()
4393 	if (c == NUL || got_int || (ex_normal_busy > 0 && c == Ctrl_C))  in bracketed_paste()
4402 	buf[idx] = NUL;  in bracketed_paste()
4405 	    if (end[idx] == NUL)  in bracketed_paste()
4640     if (gchar_cursor() != NUL || virtual_active())  in ins_right()
4687 	    || gchar_cursor() != NUL)  in ins_s_right()
4920 		replace_push(NUL);  in ins_tab()
5122 	replace_push(NUL);  in ins_eol()
5206 	return NUL;  in ins_digraph()
5248     return NUL;  in ins_digraph()
5267 	return NUL;  in ins_copychar()
5275     while ((colnr_T)temp < curwin->w_virtcol && *ptr != NUL)  in ins_copychar()
5284     if (c == NUL)  in ins_copychar()
5308 	if (c != NUL)  in ins_ctrl_ey()
5370 	buf[(*mb_char2bytes)(c, buf)] = NUL;  in do_insert_char_pre()
5374 	buf[1] = NUL;  in do_insert_char_pre()