php man page for fixdiv

fixdiv(3alleg4) 						  Allegro manual						   fixdiv(3alleg4)

NAME
       fixdiv - Fixed point division. Allegro game programming library.

SYNOPSIS
       #include <allegro.h>

       fixed fixdiv(fixed x, fixed y);

DESCRIPTION
       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 fix-
       div(). 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. */

RETURN VALUE
       Returns the result of dividing `x' by `y'. If `y' is zero, returns the maximum possible fixed point value and sets `errno' to ERANGE.

SEE ALSO
       fixadd(3alleg4), fixsub(3alleg4), fixmul(3alleg4), exfixed(3alleg4)

Allegro 							   version 4.4.2						   fixdiv(3alleg4)