Patch for x86_32: Fix bug 14195

[Dmitrieva Liubov]

Ok, fixed version is attached.

ChangeLog:

2012-08-14  Liubov Dmitrieva  <liubov.dmitrieva@gmail.com>

         [BZ #14195]
         * sysdeps/i386/i686/multiarch/strcmp-sssse3.S: Fix
         segmentation fault for a case of two empty input strings.
         * string/test-strncasecnp.c: Update.
         Add a test-case for two empty input strings and N > 0


--
Liubov Dmitrieva

2012/8/13 Carlos O'Donell <carlos_odonell@mentor.com>:
> On 8/13/2012 5:25 AM, Dmitrieva Liubov wrote:
>> Updated patch with a test-case is attached, please review it.
>>
>> ChangeLog:
>>
>> 2012-08-13  Liubov Dmitrieva  <liubov.dmitrieva@gmail.com>
>>
>
> BZ# in the wrong place.
>
> http://sourceware.org/glibc/wiki/Contribution%20checklist#Properly_Formatted_GNU_ChangeLog
>
>>          * sysdeps/i386/i686/multiarch/strcmp-sssse3.S: BZ #14195
>>          Fix segmentation fault for a case of two empty input strings.
>>          * string/test-strncasecnp.c: Update.
>>          Add a test-case for two empty input strings and N > 0
>>
>> --
>> Liubov Dmitrieva
>> Intel Corporation
>>
>>>> >> Does the testsuite catch this?
>>>> >> If it doesn't, could you please add a case which will prevent this from
>>>> >> regressing in the future?
>>>> >> Comparing two empty strings seems like a corner-case we should be testing.
>>>> >> Cheers,
>>>> >> Carlos.
>> 2012/8/10 Roland McGrath <roland@hack.frob.com>:
>>>> >> 2012-08-10  Liubov Dmitrieva  <liubov.dmitrieva@gmail.com>
>>>> >>
>>>> >>         * sysdeps/i386/i686/multiarch/strcmp-sssse3.S: Update
>>>> >>         Fix bug 14195
>>> >
>>> > This log entry is insufficient, as well as not fitting conventions.
>>> > The mention of a bug number is as "[BZ #14195]" alone (indented) on the
>>> > first line of the entry.  The text of the entry should be properly
>>> > punctuated, and it must say something meaningful about what changed.
>>
>> strncasecmp_fix.patch
>>
>>
>> diff --git a/string/test-strncasecmp.c b/string/test-strncasecmp.c
>> index 6c17530..11f1084 100644
>> --- a/string/test-strncasecmp.c
>> +++ b/string/test-strncasecmp.c
>
> Missing copyright year update and merge.
>
>> @@ -268,6 +268,9 @@ check1 (void)
>>    exp_result = simple_strncasecmp (s1, s2, n);
>>    FOR_EACH_IMPL (impl, 0)
>>      check_result (impl, s1, s2, n, exp_result);
>> +  s1 = "";
>> +  FOR_EACH_IMPL (impl, 0)
>> +    check_result (impl, s1, "", 5, 0);
>
> Move this to a function called bz14195 and add a comment that
> says it is a regression test for BZ #14195.
>
> Call it after the call to check1.
>
> If you feel like cleaning up a big I'd also accept a patch with:
> ~~~
> diff --git a/string/test-strncasecmp.c b/string/test-strncasecmp.c
> index 6c17530..420bff0 100644
> --- a/string/test-strncasecmp.c
> +++ b/string/test-strncasecmp.c
> @@ -252,8 +252,9 @@ do_random_tests (void)
>  }
>
>
> +/* Regression test for BZ #12205.  */
>  static void
> -check1 (void)
> +bz12205 (void)
>  {
>    static char cp [4096+16] __attribute__ ((aligned(4096)));
>    static char gotrel[4096] __attribute__ ((aligned(4096)));
> @@ -277,7 +278,8 @@ test_main (void)
>
>    test_init ();
>
> -  check1 ();
> +  /* Specific regression test cases.  */
> +  bz12205 ();
>
>    printf ("%23s", "");
>    FOR_EACH_IMPL (impl, 0)
> ~~~
>
>>  }
>>
>>  int
>> diff --git a/sysdeps/i386/i686/multiarch/strcmp-ssse3.S b/sysdeps/i386/i686/multiarch/strcmp-ssse3.S
>> old mode 100644
>> new mode 100755
>> index 5e6321e..9735ad0
>> --- a/sysdeps/i386/i686/multiarch/strcmp-ssse3.S
>> +++ b/sysdeps/i386/i686/multiarch/strcmp-ssse3.S
>> @@ -2445,7 +2445,7 @@ L(less16bytes_sncmp):
>>  # endif
>>       jne     L(neq_sncmp)
>>       test    %cl, %cl
>> -     je      L(eq)
>> +     je      L(eq_sncmp)
>>
>>       cmp     $1, REM
>>       je      L(eq_sncmp)
>
> OK with those changes.
>
> Cheers,
> Carlos.
> --
> Carlos O'Donell
> Mentor Graphics / CodeSourcery
> carlos_odonell@mentor.com
> carlos@codesourcery.com
> +1 (613) 963 1026
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