Inside Macintosh: PowerPC Numerics / Part 3 - Appendixes

Appendix E - MathLib Reference

Environmental Controls

Table E-3 Environmental access

Action	Function prototype
Get	void fegetenv (fenv_t *envp);
Set	void fesetenv (const fenv_t *envp);
Save	int feholdexcept (fenv_t * envp);
Restore	void feupdateenv (const fenv_t *envp);

Table E-4 Floating-point exceptions

Exceptions	Action	Function prototype
FE_INEXACT	Get	void fegetexcept(fexcept_t *flagp, int excepts);
FE_DIVBYZERO	Set	void feraiseexcept (int excepts);
FE_UNDERFLOW	Clear	void feclearexcept (int excepts);
FE_OVERFLOW		void fesetexcept (const fexcept_t *flagp, int excepts);
FE_INVALID	Test	int fetestexcept (int excepts);

Table E-5 Rounding direction modes

Modes	Action	Function prototype
FE_TONEAREST	Get	int fegetround (void);
FE_TOWARDZERO	Set	int fesetround (int round);
FE_UPWARD
FE_DOWNWARD