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Re: C portability question
On 11-May-08, at 8:43 PM, Steven M. Bellovin wrote:
Thanks, that helps -- but what is the format specifier for off_t?
After all, I don't know what type it is. I see your assert(), but
strikes me as ugly. I could, I guess, just cast to int64_t, since in
this context anything larger is highly unlikely (it's the size of a
mail message, and I don't think people are receiving >2^64 bytes of
mail in one message...)
I generally just do the blind cast to int64_t and use %q or PRId64.
If I were trying to be ultra portable I suppose I would have a compile-
time test that would report sizeof(off_t) and then use the matching
PRId* format specifier (or if there are no PRId* defines then I'd cast
to the matching sized (and signed) native type (int, long, long long,
etc) along with the matching "native" format specifier.
So far that's the best portable way I've found to print opaque integer
types like off_t.
Greg A. Woods; Planix, Inc.
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