Re: [PATCH v3 04/11] lib/vsprintf: add %*pE[achnops] format specifier

[Joe Perches <joe@perches.com>]

On Wed, 2014-08-20 at 12:42 +0300, Andy Shevchenko wrote:
> This allows user to print a given buffer as an escaped string. The rules are
> applied according to an optional mix of flags provided by additional format
> letters.

Thanks Andy.  Looks good to me.

Very trivial note:

> diff --git a/lib/vsprintf.c b/lib/vsprintf.c
[]
> @@ -1101,6 +1102,63 @@ char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa,
>  }
>  
>  static noinline_for_stack
> +char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
> +		     const char *fmt)
> +{
> +	bool found = true;
> +	int count = 1;
> +	unsigned int flags = 0;
> +	int len;
> +
> +	if (spec.field_width == 0)
> +		/* nothing to print */
> +		return buf;
> +
> +	if (ZERO_OR_NULL_PTR(addr))
> +		/* NULL pointer */
> +		return string(buf, end, NULL, spec);

As the code seems more readable than the comments,
it might be better to remove these comments or
maybe move the comment above the test.

	if (spec.field_width == 0)
		return buf;

	if (ZERO_OR_NULL_PTR(addr))
		return string(buf, end, NULL, spec);