Steve Lihn wrote:
> 
> I tried  a = BN_dup(b);
> 
> if b is NULL, it causes error. Is this normal or should it just duplicate NULL over 
>to a?
> Can someone fix it if it is a bug!

It's at times like this that I wish they hadn't made && boolean.
Wouldn't it be cool to write:

   a=b && BN_dup(b);

? (Works in Perl, BTW).

Cheers,

Ben.

--
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"My grandfather once told me that there are two kinds of people: those
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     - Indira Gandhi
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