Fixed point division.
A fixed point value can be divided by an integer with the normal `/'
operator. To divide two fixed point values, though, you must use this
function. If a division by zero 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
division by zero you should set `errno=0' before calling fixdiv(). Example:
/* This will put 0.06060 `result'. */
result = fixdiv(itofix(2), itofix(33));
/* This will put 0 into `result'. */
result = fixdiv(0, itofix(-30));
/* Sets `errno' and puts -32768 into `result'. */
result = fixdiv(itofix(-100), itofix(0));
ASSERT(!errno); /* This will fail. */
Returns the result of dividing `x' by `y'. If `y' is zero, returns the
maximum possible fixed point value and sets `errno' to ERANGE.
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