shithub: femtolisp

ref: d229b8ba4abe771ef305a1a9c1c647ac67e9e8bd
dir: /overflows.h/

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#define addof_int64(c,a,b) ( \
  (b < 1)? \
  ((INT64_MIN-(b) <= (a))?((c=(a)+(b))?0:1):1): \
  ((INT64_MAX-(b) >= (a))?((c=(a)+(b))?0:1):1) \
)

#define subof_int64(c,a,b) ( \
  (b < 1)? \
  ((INT64_MAX+(b) >= (a))?((c=(a)-(b))?0:1):1): \
  ((INT64_MIN+(b) <= (a))?((c=(a)-(b))?0:1):1) \
)

#define addof_uint64(c,a,b) ( \
  b? \
  ((UINT64_MAX-(b) >= (a))?((c=(a)+(b)),0):1): \
  0 \
)

#define subof_uint64(c,a,b) ( \
  (b < 1)? \
  ((UINT64_MAX+(b) >= (a))?((c=(a)-(b))?0:1):1): \
  (((b) <= (a))?((c=(a)-(b))?0:1):1) \
)

#define mulof(c,a,b) ( \
  (((a) != 0) && ((c=(a)*(b))/(a) != (b)))?1:0 \
)