fixdiv (3) - Linux Man Pages
fixdiv: Fixed point division. Allegro game programming library.
NAMEfixdiv - Fixed point division. Allegro game programming library.
DESCRIPTIONA 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:
fixed result; /* 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. */