Converts a floating point value to fixed point.
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:
number = itofix(-40000);
ASSERT(fixfloor(number) == -32768);
number = itofix(64000);
ASSERT(fixfloor(number) == 32767);
ASSERT(!errno); /* This will fail. */
Returns the value of the floating point value converted to fixed point
clamping overflows (and setting `errno').
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