Multiplies two fixed point values together.

A fixed point value can be multiplied or divided by an integer with the
normal `*' and `/' operators. To multiply two fixed point values, though,
you must use this function.

If an overflow occurs, `errno' will be set and the maximum possible value will be returned, but `errno' is not cleared if the operation is successful. This means that if you are going to test for overflow you should set `errno=0' before calling fixmul(). Example:

If an overflow occurs, `errno' will be set and the maximum possible value will be returned, but `errno' is not cleared if the operation is successful. This means that if you are going to test for overflow you should set `errno=0' before calling fixmul(). Example:

fixed result;

/* This will put 30000 into `result'. */ result = fixmul(itofix(10), itofix(3000)); /* But this overflows, and sets `errno'. */ result = fixmul(itofix(100), itofix(3000)); ASSERT(!errno);

Returns the clamped result of multiplying `x' by `y', setting `errno' to
ERANGE if there was an overflow.

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