man ftofix () - Converts a floating point value to fixed point. Allegro game programming library.
NAME
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(n) == -32768); number = itofix(6); ASSERT(fixfloor(n) == 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').