Re: [Qemu-devel] [PATCH 1/5] CODING_STYLE: add preprocessor rules

[malc <av1474@comtv.ru>]

On Thu, 12 Aug 2010, Blue Swirl wrote:

> Add preprocessor rules from libvirt HACKING.
> 
> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
> ---
>  CODING_STYLE |   13 +++++++++++++
>  1 files changed, 13 insertions(+), 0 deletions(-)
> 
> diff --git a/CODING_STYLE b/CODING_STYLE
> index 92036f3..c4c09ab 100644
> --- a/CODING_STYLE
> +++ b/CODING_STYLE
> @@ -79,3 +79,16 @@ and clarity it comes on a line by itself:
>  Rationale: a consistent (except for functions...) bracing style reduces
>  ambiguity and avoids needless churn when lines are added or removed.
>  Furthermore, it is the QEMU coding style.
> +
> +5. Preprocessor
> +
> +For variadic macros, stick with C99 syntax:
> +
> +#define vshPrint(_ctl, ...)   fprintf(stdout, __VA_ARGS__)

_ctl is not used inside the macro expansion, furthermore i'd avoid
using leading underscore even for macro arguments.

> +
> +Use parenthesis when checking if a macro is defined, and use
> +indentation to track nesting:
> +
> +#if defined(HAVE_POSIX_FALLOCATE) && !defined(HAVE_FALLOCATE)
> +# define fallocate(a,ignored,b,c) posix_fallocate(a,b,c)
> +#endif
> 

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