Philipp Marek <philipp@xxxxxxxxxxxxx> writes:
> If I'm doing
> ino_t ino;
> char *name;
> sprintf("%Lu %s", ino, name);
Note that "L" is not a valid length modifier for integer formats.
> that works fine for 64bit systems, but writes trash for sizeof(ino_t) == 4.
>
> Is there an easy way to find the format strings (sprintf, printf, sscanf) for
> various system types, or something like that?
Assuming you meant %llu instead of %Lu you can always add a cast to
unsigned long long to match the format.
> Or has somebody some already defined preprocessor magic to get this for some
> variable?
> I'm thinking of something along the lines
> #define FORMAT(x)
> #if sizeof(x) == 4
> "%l"
> #else
> #if sizeof(x) == 8
> "%L"
> #else
> #error "Don't know size"
> #endif
> #endif
You can't use sizeof in preprocessor directives. Besides that, the size
of an integer says nothing about its type. For example, a 4 byte integer
can be either int or long on an ILP32 system, and an 8 byte integer can be
long or long long on an LP64 system.
Andreas.
--
Andreas Schwab, SuSE Labs, schwab@xxxxxxx
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
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