linux-kernel - Re: [PATCH] lib: fix scnprintf() if @size is == 0

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Date:	Wed, 25 Aug 2010 08:10:20 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Joe Perches <joe@...ches.com>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lib: fix scnprintf() if @size is == 0

On Wed, Aug 25, 2010 at 8:03 AM, Joe Perches <joe@...ches.com> wrote:
>
> Isn't simpler to check size at the beginning of the function?
>
> diff --git a/lib/vsprintf.c b/lib/vsprintf.c
> index 7af9d84..779236f 100644
> --- a/lib/vsprintf.c
> +++ b/lib/vsprintf.c
> @@ -1505,6 +1505,9 @@ int scnprintf(char *buf, size_t size, const char *fmt, ...)
>        va_list args;
>        int i;
>
> +       if (!size)
> +               return 0;
> +

It is a rare case, so don't slow down the normal users.

>        va_start(args, fmt);
>        i = vsnprintf(buf, size, fmt, args);
>        va_end(args);
>
>
>



-- 
Regards,
Changli Gao(xiaosuo@...il.com)
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