linux-kernel - Re: [PATCH]: improved strnicmp in lib/string.c

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Date:	Wed, 7 May 2008 22:33:57 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Soumyadip Das Mahapatra" <dip_kernel@...oo.co.in>
Cc:	linux-kernel@...r.kernel.org,
	"Alexey Dobriyan" <adobriyan@...il.com>
Subject: Re: [PATCH]: improved strnicmp in lib/string.c

On Wed, May 7, 2008 at 9:21 PM, Soumyadip Das Mahapatra
<dip_kernel@...oo.co.in> wrote:
>   int strnicmp(const char *s1, const char *s2, size_t len)
>   {
>  +    /* Yes, i am keeping 'em unsigned too */
>  +    unsigned char c1, c2, c3, c4;
>  +    unsigned count = 0;
>  +    int flag = -1;
>  +
>  +    c1 = c2 = c3 = c4 = 0;
>  +
>  +    if(len > 0)
>  +    {
>  +        for(; count <= len/2; count++)
>  +        {
>  +            c1 = tolower(s1[count]);    // well, we
>  +            c2 = tolower(s2[count]);    // are ignoring
>  +            c3 = tolower(s1[len-count-1]);    // cases
>  +            c4 = tolower(s2[len-count-1]);    // thats why
>  +
>  +            if(c1 == c2)
>  +            {
>  +                if(c3 != c4)
>  +                {
>  +                    flag = 1;
>  +                    break;
>  +                }
>  +            }
>  +            else
>                  break;
>  -        } while (--len);
>  +            flag = 0;

Unconditionally setting flag to zero in the loop also broken. For
example, comparing "hello" and "he9lo" resunts into zero now.

>  +        }
>      }
>  -    return (int)c1 - (int)c2;
>  -}
>  +    return flag;     // return 0 for matching and
>  +}            // nonzero for mismatch
>   EXPORT_SYMBOL(strnicmp);
>   #endif
>
>
>
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