Re: 64-bit masks

[der Mouse <mouse%Rodents-Montreal.ORG@localhost>]

> 1. What is the correct (portable?) way of specifying 64-bit constants?

> If I need a 64-bit constant set to all 1s, will the following work on
> all systems

> unit64_t num = 0xffffffffffffffffULL;

(Well, uint64_t.)  This will work on anything NetBSD runs on.  I'm not
sure whether unsigned long long is guaranteed by C to be at least 64
bits wide.  (Those versions of C that _have_ unsigned long long, that
is; it's a relatively recent addition to the language.)

You might want to write ~0ULL instead; it's smaller and somewhat
clearer.  (Just looking at what you wrote, I have to count characters
to tell you didn't write 0xfffffffffffffffULL instead, for example.)

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