linux-kernel - Re: [PATCH v2 001/101] lib: Add option iterator

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Message-ID: <CAMuHMdXsj9RrqUkwLjoxF2rXKcy9UK4Rwv1RcB0cnJXMXJU97g@mail.gmail.com>
Date:   Fri, 10 Mar 2023 09:21:17 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Thomas Zimmermann <tzimmermann@...e.de>
Cc:     deller@....de, timur@...nel.org, rdunlap@...radead.org,
        paulus@...ba.org, benh@...nel.crashing.org, linux@...linux.org.uk,
        pjones@...hat.com, adaplas@...il.com, s.hauer@...gutronix.de,
        shawnguo@...nel.org, mbroemme@...mpq.org, thomas@...ischhofer.net,
        James.Bottomley@...senpartnership.com, sudipm.mukherjee@...il.com,
        teddy.wang@...iconmotion.com, corbet@....net,
        linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 001/101] lib: Add option iterator

Hi Thomas,

On Thu, Mar 9, 2023 at 5:02 PM Thomas Zimmermann <tzimmermann@...e.de> wrote:
> Add struct option_iter and helpers that walk over individual options
> of an option string. Add documentation.
>
> Kernel parameters often have the format of
>
>   param=opt1,opt2:val,opt3
>
> where the option string contains a number of comma-separated options.
> Drivers usually use strsep() in a loop to extract individual options
> from the string. Each call to strsep() modifies the given string, so
> callers have to duplicate kernel parameters that are to be parsed
> multiple times.
>
> The new struct option_iter and its helpers wrap this code behind a
> clean interface. Drivers can iterate over the options without having
> to know the details of the option-string format. The iterator handles
> string memory internally without modifying the original options.
>
> v2:
>         * improve documentation (Randy)
>         * implement option_iter_next() as function
>         * allow modification of the returned options
>
> Signed-off-by: Thomas Zimmermann <tzimmermann@...e.de>

Thanks for your patch!

I> ---
>  Documentation/core-api/kernel-api.rst |   9 +++
>  include/linux/cmdline.h               |  36 +++++++++
>  lib/Makefile                          |   2 +-
>  lib/cmdline_iter.c                    | 109 ++++++++++++++++++++++++++
>  4 files changed, 155 insertions(+), 1 deletion(-)
>  create mode 100644 include/linux/cmdline.h
>  create mode 100644 lib/cmdline_iter.c

Just wondering, is there any code that can be shared with/reused from
the existing lib/cmdline.c?

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds