NAME

       fixmul - Multiplies two fixed point values together. Allegro game programming library.

SYNOPSIS

       #include <allegro.h>

       fixed fixmul(fixed x, fixed y);

DESCRIPTION

       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:

          fixed result;

          /* This will put 30000 into `result'. */
          result = fixmul(itofix(10), itofix(3000));
          /* But this overflows, and sets `errno'. */
          result = fixmul(itofix(100), itofix(3000));
          ASSERT(!errno);

RETURN VALUE

       Returns the clamped result of multiplying `x' by `y', setting `errno' to ERANGE if there was an overflow.

SEE ALSO

       fixadd(3alleg4), fixsub(3alleg4), fixdiv(3alleg4), ex3buf(3alleg4), excustom(3alleg4),  exfixed(3alleg4),
       exspline(3alleg4), exstars(3alleg4), exupdate(3alleg4)