69     if (*wp->w_p_cocu == NUL)  in conceal_cursor_line()
119     if (*wp->w_p_wcr != NUL)  in get_wcr_attr()
883     while (*s != NUL)  in status_match_len()
904 			  && (s[0] == '\t' || (s[0] == '\\' && s[1] != NUL)))  in skip_status_match_char()
1013 	*buf = NUL;  in win_redr_status_matches()
1046 	    for ( ; *s != NUL; ++s)  in win_redr_status_matches()
1078     buf[len] = NUL;  in win_redr_status_matches()
1121 	    *selend = NUL;  in win_redr_status_matches()
1191 	if (p == NULL || *p == NUL)  in get_keymap_str()
1202 	    buf[0] = NUL;  in get_keymap_str()
1207     return buf[0] != NUL;  in get_keymap_str()
1297 	    if (*wp->w_p_stl != NUL)  in win_redr_custom()
1303 					 *wp->w_p_stl == NUL ? 0 : OPT_LOCAL);  in win_redr_custom()
1343     buf[len] = NUL;  in win_redr_custom()
1410 	buf[(*mb_char2bytes)(c, buf)] = NUL;  in screen_putchar()
1414 	buf[1] = NUL;  in screen_putchar()
1434 	bytes[1] = NUL;  in screen_getbytes()
1437 	    bytes[utfc_char2bytes(off, bytes)] = NUL;  in screen_getbytes()
1442 	    bytes[2] = NUL;  in screen_getbytes()
1447 	    bytes[2] = NUL;  in screen_getbytes()
1551 	    && *ptr != NUL)  in screen_puts_len()
1580 			nc = NUL;  in screen_puts_len()
1581 			nc1 = NUL;  in screen_puts_len()
1662 		    && (len < 0 ? ptr[mbyte_blen] == NUL  in screen_puts_len()
1843 	    if ((attr & HL_BOLD) && *T_MD != NUL)	// bold  in screen_start_highlight()
1855 	    if ((attr & HL_STANDOUT) && *T_SO != NUL)	// standout  in screen_start_highlight()
1857 	    if ((attr & HL_UNDERCURL) && *T_UCS != NUL) // undercurl  in screen_start_highlight()
1860 			|| ((attr & HL_UNDERCURL) && *T_UCS == NUL))  in screen_start_highlight()
1861 		    && *T_US != NUL)  in screen_start_highlight()
1863 	    if ((attr & HL_ITALIC) && *T_CZH != NUL)	// italic  in screen_start_highlight()
1865 	    if ((attr & HL_INVERSE) && *T_MR != NUL)	// inverse (reverse)  in screen_start_highlight()
1867 	    if ((attr & HL_STRIKETHROUGH) && *T_STS != NUL)	// strike  in screen_start_highlight()
2034 	    if ((screen_attr & HL_UNDERCURL) && *T_UCE != NUL)  in screen_stop_highlight()
2042 			    || ((screen_attr & HL_UNDERCURL) && *T_UCE == NUL))  in screen_stop_highlight()
2156     if (*T_XN == NUL  in screen_char()
2208 	buf[utfc_char2bytes(off, buf)] = NUL;  in screen_char()
3067     return (*p != NUL && (t_colors <= 1  in can_clear()
3077 		|| *T_UT != NUL)  in can_clear()
3134 	if (screen_attr && *T_MS == NUL)  in windgoto()
3299 		    if (T_ND[0] != NUL && T_ND[1] == NUL)  in windgoto()
3332 							     && *T_CRI != NUL)  in windgoto()
3575 	if (scroll_region && (wp->w_width == Columns || *T_CSV != NUL))  in win_do_lines()
3583 	if (scroll_region && (wp->w_width == Columns || *T_CSV != NUL))  in win_do_lines()
3705     if (wp != NULL && wp->w_width != Columns && *T_CSV == NUL)  in screen_ins_lines()
3709     else if (*T_CAL != NUL && (line_count > 1 || *T_AL == NUL))  in screen_ins_lines()
3711     else if (*T_CDL != NUL && result_empty && (line_count > 1 || !can_ce))  in screen_ins_lines()
3713     else if (*T_AL != NUL)  in screen_ins_lines()
3717     else if (*T_DL != NUL && result_empty)  in screen_ins_lines()
3719     else if (*T_SR != NUL && row == 0 && (*T_DA == NUL || can_ce))  in screen_ins_lines()
3759     if (wp != NULL && wp->w_wincol != 0 && *T_CSV != NUL && *T_CCS == NUL)  in screen_ins_lines()
3762     if (*T_CCS != NUL)	   // cursor relative to region  in screen_ins_lines()
3916     can_delete = (*T_DB == NUL || can_clear(T_CE));  in screen_del_lines()
3930     if (wp != NULL && wp->w_width != Columns && *T_CSV == NUL)  in screen_del_lines()
3940 						*T_CDL == NUL))  in screen_del_lines()
3942     else if (*T_CDL != NUL && line_count > 1 && can_delete)  in screen_del_lines()
3947     else if (*T_DL != NUL && can_delete)  in screen_del_lines()
3949     else if (*T_CDL != NUL && can_delete)  in screen_del_lines()
3974     if (wp != NULL && wp->w_wincol != 0 && *T_CSV != NUL && *T_CCS == NUL)  in screen_del_lines()
3977     if (*T_CCS != NUL)	    // cursor relative to region  in screen_del_lines()
4146 		|| restart_edit != NUL  in showmode()
4429     if (*p_tal != NUL)  in draw_tabline()
4862 	if (varp == &wp->w_p_lcs && wp->w_p_lcs[0] == NUL)  in set_chars_option()
4881 			((varp == &p_lcs || varp == &wp->w_p_lcs) ? NUL : ' ');  in set_chars_option()
4885 		lcs_chars.tab1 = NUL;  in set_chars_option()
4886 		lcs_chars.tab3 = NUL;  in set_chars_option()
4890 		    lcs_chars.multispace[multispace_len] = NUL;  in set_chars_option()
4912 			&& p[len + 1] != NUL)  in set_chars_option()
4921 			if (*s == NUL)  in set_chars_option()
4926 			if (!(*s == ',' || *s == NUL))  in set_chars_option()
4934 		    if (*s == ',' || *s == NUL)  in set_chars_option()
4960 			&& p[len + 1] != NUL)  in set_chars_option()
4968 			while (*s != NUL && *s != ',')  in set_chars_option()
4984 			while (*s != NUL && *s != ',')  in set_chars_option()