linux-kernel - Re: [PATCH] alpha: move from strlcpy with unused retval to strscpy

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Date:   Fri, 19 Aug 2022 07:37:53 +0200
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     Joe Perches <joe@...ches.com>
Cc:     linux-kernel@...r.kernel.org,
        Richard Henderson <richard.henderson@...aro.org>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>, linux-alpha@...r.kernel.org,
        Julia Lawall <Julia.Lawall@...ia.fr>
Subject: Re: [PATCH] alpha: move from strlcpy with unused retval to strscpy

Hi Joe,

Glad you like this series.

> Last time I posted a coccinelle script for strlcpy->strscpy conversions
> with unused returns, there were several variants that were not converted.
> 
> https://lore.kernel.org/cocci/a3279a5772b2e49b57890cd75e97360b82890798.camel@perches.com/T/#m502108bfe0cc6a41d499a4c1b55d5f5db1423465
> 
> Did you post the script you used?

First version here, very similar to yours:

https://lore.kernel.org/all/YvhXzarjOLEJ8nsW@shikoro/

The final version has another rule to add missing parens to the argument
of a sizeof operator:

@ main @
@@
- strlcpy
+ strscpy
  (...);

// make sure sizeof always has parens. Isomorphs will remove existing ones if present before.
@ add_parens depends on main @
expression dst, src, E;
@@
  strscpy(dst, src,
- sizeof(E)
+ sizeof(E)
  );

Like your try, some header files are missing. I guess Julia's remarks
about that from the thread above will fix this as well. However, since
there are the instances left where the return value of strlcpy is used
anyhow, I left those for manual fixing.

Thanks,

   Wolfram


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