If you are into optimization, and assuming the input is always one of the four characters, the function below might be worth a try as a replacement for the map:
char map(const char in)
{ return ((in & 2) ? '\x8a' - in : '\x95' - in); }
It works based on the fact that you are dealing with two symmetric pairs. The conditional works to tell apart the A/T pair from the G/C one (‘G’ and ‘C’ happen to have the second-least-significant bit in common). The remaining arithmetics performs the symmetric mapping. It’s based on the fact that a = (a + b) – b is true for any a,b.
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