linux-kernel - Re: [PATCH 4/7] lib: Introduce strnstr()

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Message-ID: <81b0412b1001160312x3874bbddj28aac9e5a36bf98a@mail.gmail.com>
Date:	Sat, 16 Jan 2010 12:12:57 +0100
From:	Alex Riesen <raa.lkml@...il.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/7] lib: Introduce strnstr()

On Thu, Jan 14, 2010 at 03:53, Li Zefan <lizf@...fujitsu.com> wrote:
> @@ -667,7 +667,7 @@ EXPORT_SYMBOL(memscan);
>  */
>  char *strstr(const char *s1, const char *s2)
>  {
> -       int l1, l2;
> +       size_t l1, l2;
>

This chunk is not related, is it?

> @@ -684,6 +684,31 @@ char *strstr(const char *s1, const char *s2)
>  EXPORT_SYMBOL(strstr);
>  #endif
>
> +#ifndef __HAVE_ARCH_STRNSTR
> +/**
> + * strnstr - Find the first substring in a length-limited string
> + * @s1: The string to be searched
> + * @s2: The string to search for
> + * @len: the maximum number of characters to search
> + */
> +char *strnstr(const char *s1, const char *s2, size_t len)
> +{
> +       size_t l1 = len, l2;

Are you sure you want to search _past_ the NUL-terminator
of s1?

> +       l2 = strlen(s2);
> +       if (!l2)
> +               return (char *)s1;
> +       while (l1 >= l2) {
> +               l1--;
> +               if (!memcmp(s1, s2, l2))
> +                       return (char *)s1;
> +               s1++;
> +       }
> +       return NULL;
> +}
--
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