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Re: C portability question

On Sun, 11 May 2008, Steven M. Bellovin wrote:
> Anyway -- what is the portable way to printf an off_t

For arbitrary opaque signed integer types, cast to intmax_t and print
with "%jd".  For arbitrary opaque unsigned integer types, cast to
uintmax_t and print with "%ju".  The "j" modifier is defined in the C99
standard, section paragraph 7, and works in NetBSD.  You can
also use PRIdMAX or PRIuMAX (defined in section 7.8.1 paragraphs 2 and

The other advice you received, about casting to int64_t or something,
will probably work on NetBSD but is not portable to all C99

--apb (Alan Barrett)

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