ftofix (3) Linux Manual Page

ftofix – Converts a floating point value to fixed point. Allegro game programming library.

Synopsis

#include <allegro.h>

fixed ftofix(double x);

Description

Converts a floating point value to fixed point. Unlike itofix(), this function clamps values which could overflow the type conversion, setting `errno’ to ERANGE in the process if this happens. Example:

 fixed number;

 number = itofix(-40000);

 ASSERT(fixfloor(number) == -32768);

 number = itofix(64000);

 ASSERT(fixfloor(number) == 32767);

 ASSERT(!errno); /* This will fail. */

Return Value

Returns the value of the floating point value converted to fixed point clamping overflows (and setting `errno’).

See Also

fixtof(3), itofix(3), fixtoi(3), exfixed(3), exspline(3), exupdate(3)