787 static int next_column(char c, int co)  in next_column()  argument
790 		co = next_tabstop(co);  in next_column()
792 		co++; // display as ^X, use 2 columns  in next_column()
793 	return co + 1;  in next_column()
799 	int co = 0;  in get_column()  local
802 		co = next_column(*r, co);  in get_column()
803 	return co;  in get_column()
812 static void new_screen(int ro, int co)  in new_screen()  argument
817 	screensize = ro * co + 8;  in new_screen()
828 		s += co;  in new_screen()
838 	int cnt, ro, co;  in sync_cursor()  local
881 	co = 0;  in sync_cursor()
885 		co = next_column(*tp, co) - 1;  in sync_cursor()
888 			co++;  in sync_cursor()
891 	} while (tp++ < d && ++co);  in sync_cursor()
906 	if (co < 0 + offset) {  in sync_cursor()
907 		offset = co;  in sync_cursor()
909 	if (co >= columns + offset) {  in sync_cursor()
910 		offset = co - columns + 1;  in sync_cursor()
917 	co -= offset;  in sync_cursor()
920 	*col = co;  in sync_cursor()
927 	int co;  in format_line()  local
932 	co = 0;  in format_line()
933 	while (co < columns + tabstop) {  in format_line()
946 					while ((co % tabstop) != (tabstop - 1)) {  in format_line()
947 						dest[co++] = c;  in format_line()
950 					dest[co++] = '^';  in format_line()
958 		dest[co++] = c;  in format_line()
961 		if (ofs >= tabstop && co >= tabstop) {  in format_line()
962 			memmove(dest, dest + tabstop, co);  in format_line()
963 			co -= tabstop;  in format_line()
970 	if (co < ofs)  in format_line()
971 		ofs = co;  in format_line()
973 	co -= ofs;  in format_line()
976 	if (co < columns)  in format_line()
977 		memset(&dest[co], ' ', columns - co);  in format_line()
1829 	int co;  in move_to_col()  local
1832 	co = 0;  in move_to_col()
1836 		co = next_column(*p, co);  in move_to_col()
1837 	} while (co <= l && p++ < end);  in move_to_col()