10-02-2008
Rationale
What is the reason that you want such an implementation?
errno is usually set by the called function when it returns to indicate whether it failed or succeeded.
Exceptions are those functions that don't use errno but may set it unknowingly. In any case it's not advisable to assume anything.
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LEARN ABOUT MOJAVE
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)