South Carolina is a winner-take-all, the only one until March 15.
South Carolina is a not a winner-take-all contest, it is a State level and district level distribution. The winner of the State wins 29 delegate and the winner of each of the seven districts wins three delegates.
Now it looks like Trump will win each of the districts and end up winning all of the delegates, but it isn’t a technical winner-take-all contest.