Re: [nft PATCH 26/28] utils: Introduce expr_print_debug()

[Pablo Neira Ayuso <pablo@netfilter.org>]

On Thu, Oct 23, 2025 at 06:14:15PM +0200, Phil Sutter wrote:
> A simple function to call in random places when debugging
> expression-related code.
> 
> Signed-off-by: Phil Sutter <phil@nwl.cc>
> ---
>  include/utils.h | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/include/utils.h b/include/utils.h
> index e18fabec56ba3..0db0cf20e493c 100644
> --- a/include/utils.h
> +++ b/include/utils.h
> @@ -26,6 +26,15 @@
>  #define pr_gmp_debug(fmt, arg...) ({ if (false) {}; 0; })
>  #endif
>  
> +#define expr_print_debug(expr)					\
> +{								\
> +	struct output_ctx octx = { .output_fp = stdout };	\
> +	printf("%s:%d: ", __FILE__, __LINE__);			\
> +	printf("'" #expr "' type %s: ", expr_name(expr));	\
> +	expr_print((expr), &octx);				\
> +	printf("\n");						\
> +}

Where is the first user of this? Better add and add users to improve
tracking when looking at git annotate?

> +
>  #define __fmtstring(x, y)	__attribute__((format(printf, x, y)))
>  #if 0
>  #define __gmp_fmtstring(x, y)	__fmtstring(x, y)
> -- 
> 2.51.0
>