• Frederic Weisbecker's avatar
    perf_counter tools: Add new OPT_CALLBACK_DEFAULT option · 5a4b1817
    Frederic Weisbecker authored
    There is no predefined macro to create an option that can have
    a custom value or a default one if none is given.
    
    This patch provides a new helper OPT_CALLBACK_DEFAULT() which
    defines such kind of option.
    
    For example, considering an option -c, we want to get the
    default value in the following cases:
    
        perf command -c -d
        perf command -d -c
    
    And the foo value when it's given:
    
        perf command -c foo -d
        perf command -d -c foo
    
    That's also why PARSE_OPT_LASTARG_DEFAULT is extended here to
    support default values whatever the position of the option, not
    only in the end.
    
    Should it now be renamed to PARSE_OPT_ARG_DEFAULT ?
    Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Mike Galbraith <efault@gmx.de>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Anton Blanchard <anton@samba.org>
    Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
    Cc: git@vger.kernel.org
    LKML-Reference: <1246550301-8954-2-git-send-email-fweisbec@gmail.com>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    5a4b1817
parse-options.h 6.24 KB