netdev - Re: [PATCH iproute2-next v2 5/6] utils: Introduce and use print_name_and

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Date:   Wed, 31 Jan 2018 20:50:08 -0700
From:   David Ahern <dsahern@...il.com>
To:     Serhey Popovych <serhe.popovych@...il.com>, netdev@...r.kernel.org
Subject: Re: [PATCH iproute2-next v2 5/6] utils: Introduce and use
 print_name_and_link() to print name@...k

On 1/30/18 11:09 AM, Serhey Popovych wrote:
> There is at least three places implementing same things: two in
> ipaddress.c print_linkinfo() & print_linkinfo_brief() and one in
> bridge/link.c.
> 
> These two implementations diverge from each other very little:
> bridge/link.c does not support JSON output at the moment and
> print_linkinfo_brief() does not handle IFLA_LINK_NETNS case.
> 
> Introduce and use print_name_and_link() routine to handle name@...k
> output in all possible variations; respect IFLA_LINK_NETNS attribute to
> handle case when link is in different namespace; use "if%d" template
> for interface name instead of "<nil>" to share logic with other
> code (e.g. ll_name_to_index() and ll_index_to_name()) supporting such
> template.
> 
> Signed-off-by: Serhey Popovych <serhe.popovych@...il.com>
> ---
>  bridge/link.c   |   13 +++----------
>  include/utils.h |    4 ++++
>  ip/ipaddress.c  |   48 ++----------------------------------------------
>  lib/utils.c     |   51 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 60 insertions(+), 56 deletions(-)
> 
> diff --git a/bridge/link.c b/bridge/link.c
> index a11cbb1..90c9734 100644
> --- a/bridge/link.c
> +++ b/bridge/link.c
> @@ -125,20 +125,13 @@ int print_linkinfo(const struct sockaddr_nl *who,
>  	if (n->nlmsg_type == RTM_DELLINK)
>  		fprintf(fp, "Deleted ");
>  
> -	fprintf(fp, "%d: %s ", ifi->ifi_index,
> -		tb[IFLA_IFNAME] ? rta_getattr_str(tb[IFLA_IFNAME]) : "<nil>");
> +	fprintf(fp, "%d: ", ifi->ifi_index);
> +
> +	print_name_and_link("%s: ", COLOR_NONE, name, tb);

It only needs tb[IFLA_LINK] so just pass it. Makes the arg list
consistent with the function name too.