netdev - Re: [PATCH net-next v3 1/2] lib: vsprintf: add IPv4/v6 generic %p[Ii]S[pfs] format specifier

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Date:	Fri, 28 Jun 2013 08:44:49 -0700
From:	Joe Perches <joe@...ches.com>
To:	Daniel Borkmann <dborkman@...hat.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	linux-sctp@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v3 1/2] lib: vsprintf: add IPv4/v6 generic
 %p[Ii]S[pfs] format specifier

On Fri, 2013-06-28 at 14:05 +0200, Daniel Borkmann wrote:
> In order to avoid making code that deals with printing both, IPv4 and
> IPv6 addresses, unnecessary complicated as for example ...

Thanks Daniel, seems sensible.  Just trivial comments...

[]

> diff --git a/lib/vsprintf.c b/lib/vsprintf.c
[]

Should any other include other than net/addrconf be needed?

> +char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa,
> +			 struct printf_spec spec, const char *fmt)
> +{
[]
> +	char fmt6[2] = { fmt[0], '6'};

This looks odd to me.  why not use a bool compressed
flag and identify this before the isalpha loop and not
have fmt6 at all?

> +	u8 off = 0;
> +
> +	fmt++;
> +	while (isalpha(*++fmt)) {
> +		switch (*fmt) {
> +		case 'p':
> +			have_p = true;
> +			break;
> +		case 'f':
> +			have_f = true;
> +			break;
> +		case 's':
> +			have_s = true;
> +			break;
> +		case 'c':
> +			have_c = true;
> +			break;
> +		}
> +	}


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