netdev - [PATCH iproute2-next v2 0/3] ip/tunnel: Unify tunnel help message print routines

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Message-Id: <1518158702-32604-1-git-send-email-serhe.popovych@gmail.com>
Date:   Fri,  9 Feb 2018 08:44:59 +0200
From:   Serhey Popovych <serhe.popovych@...il.com>
To:     netdev@...r.kernel.org
Subject: [PATCH iproute2-next v2 0/3] ip/tunnel: Unify tunnel help message print routines

To show only relevant diffs of ip and ipv6 variants help message print
routines needs to be unified and improved.

Get rid of print_usage() and usage() wrappers: use single function to
output help message. As side effect we return -1 from parse function
instead of calling exit(2) in case of "... tunnel <help|garbage>" is
found.

Additionally we get pointer to @struct link_util and can directly access
->id information to prepare customized help message.

Split calls to fprintf() two group: one that contains format string with
specifiers (thus requiring parameters) and another one that does not.
This helps compiler to optimize calls to fprintf() with fputs() when no
format specifiers in string. Do not use fputs() directly to keep code
formatting nice.

After this series applied following diffs:

  # diff -urN ip/link_gre{,6}.c
  # diff -urN ip/link_vti{,6}.c
  # diff -urN ip/link_ip{,6}tnl.c

in scope of help print routines reduced to necessary minimum.

Tested minimally by compiling and executing "ip link help <kind>" and
"ip link add type help" commands. Looks correct.

See individual patch description for more information.

Reviews, commands and suggestions are welcome.

v2
  Dropped function prefix changes from the series: this is not strictly
  relared change and should be done separately.

Thanks,
Serhii

Serhey Popovych (3):
  vti/vti6: Unify vti_print_help()
  gre/gre6: Unify gre_print_help()
  iptnl/ip6tnl: Unify iptunnel_print_help()

 ip/link_gre.c    |   73 ++++++++++++++++++++------------------------
 ip/link_gre6.c   |   74 +++++++++++++++++++++------------------------
 ip/link_ip6tnl.c |   45 ++++++++++++++--------------
 ip/link_iptnl.c  |   88 ++++++++++++++++++++++++++----------------------------
 ip/link_vti.c    |   42 +++++++++++---------------
 ip/link_vti6.c   |   33 +++++++++-----------
 6 files changed, 165 insertions(+), 190 deletions(-)

-- 
1.7.10.4