In message <[EMAIL PROTECTED]>, Paul Herma
n writes:

>  arc4random() returns random numbers in the range of 0 to
>  (2**32)-1, and therefore has twice the range of RAND_MAX.

Good.

>  EXAMPLES
>  The following produces a drop-in replacement for the traditional
>  random() and rand() functions using arc4random():
>      #define arc4random31()   (arc4random() & 0x7FFFFFFF)

Not good.  Only true on 32 bit archs.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
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