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:
/* This will put 30000 into `result'. */
result = fixmul(itofix(10), itofix(3000));
/* But this overflows, and sets `errno'. */
result = fixmul(itofix(100), itofix(3000));
Returns the clamped result of multiplying `x' by `y', setting `errno' to
ERANGE if there was an overflow.
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