Regardless of what is being measured, 8 oz is equal to 1 cup.
True, if it's fluid ounces. If ounces are weight, it's not the same - a cup of lead and a cup of sugar can't both weigh 8 oz. This is yet another problem with using these archaic measurements rather than metric.
So first determine whether the 8 oz means volume (then it's a cup) or weight (use a kitchen scale).
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One cup of sugar is about 7 ounces. Therefore, 8 ounces of sugar is a little over a cup, roughly 1 and an eighth a cup.
Eight ounces of granulated sugar is about 1.125 cups, or 18 tablespoons.
The conversions for packed brown sugar and powdered sugar are different.