[haiku-development] Re: %Ld in Haiku code
- From: Ingo Weinhold <ingo_weinhold@xxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Wed, 27 Oct 2010 20:00:25 +0200
On 2010-10-27 at 19:05:47 [+0200], François Revol <revol@xxxxxxx> wrote:
> Le 27 oct. 2010 à 18:58, Grzegorz Dąbrowski a écrit :
> > I wonder what does %Ld mean? It's widely used in Haiku code and
> > according to standards [1] and clang [2] it is incorrect.
> >
> > [1] http://www.opengroup.org/onlinepubs/009695399/
> > [2] warning: length modifier 'L' results in undefined behavior or no
> > effect with 'd' conversion specifier [-Wformat]
>
> It's a GCCism for %lld (is this one standardized ?).
According to POSIX [1]:
"ll (ell-ell)
Specifies that a following d , i , o , u , x , or X conversion specifier
applies to a long long or unsigned long long argument; or that a following n
conversion specifier applies to a pointer to a long long argument.|
"L
Specifies that a following a , A , e , E , f , F , g , or G conversion
specifier applies to a long double argument."
> When possible those should be fixed to conform to the standard, either %lld
> if that's it, or those PRI* macros when appropriate.
>
> Note however, that in some places (bootloader mostly) the set of format
> qualifiers is smaller than the standard, and I recall having issues with
> %lld at least once, maybe in BSD code ?
The boot loader and kernel *printf() support "L" and "ll" for both integer
and float types.
CU, Ingo
[1] http://www.opengroup.org/onlinepubs/9699919799/functions/fprintf.html
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