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bug#6378: all-completions Segfault


From: Thierry Volpiatto
Subject: bug#6378: all-completions Segfault
Date: Wed, 09 Jun 2010 07:13:31 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)

Stefan Monnier <address@hidden> writes:

>> Although I don't understand why the code-path for the vector
>> version can't be simplified as in the following patch, which also
>> fixes the problem AFAICT:
>
>> diff --git a/src/minibuf.c b/src/minibuf.c
>> index ad81bfd..c6aae27 100644
>> --- a/src/minibuf.c
>> +++ b/src/minibuf.c
>> @@ -1610,22 +1610,14 @@ with a space are ignored unless STRING itself starts 
>> with a space.  */)
>>      }
>>        else if (type == 2)
>>      {
>> -      if (!EQ (bucket, zero))
>> -        {
>> -          elt = bucket;
>> -          eltstring = elt;
>> -          if (XSYMBOL (bucket)->next)
>> -            XSETSYMBOL (bucket, XSYMBOL (bucket)->next);
>> -          else
>> -            XSETFASTINT (bucket, 0);
>> -        }
>> -      else if (++index >= obsize)
>> -        break;
>> -      else
>> -        {
>> -          bucket = XVECTOR (collection)->contents[index];
>> -          continue;
>> -        }
>> +          if ( index < obsize )
>> +            {
>> +              elt = bucket;
>> +              eltstring = elt;
>> +              bucket = XVECTOR (collection)->contents[++index];
>> +            }
>> +          else
>> +            break;
>>      }
>>        else /* if (type == 3) */
>>      {
>
> IIUC this would only loop through all the buckets, without looping
> through each bucket's linked list.
> Compare (length obarray)
> and     (let ((i 0)) (mapatoms (lambda (_) (incf i)) obarray) i)

Don't know if that related but

(completing-read "test: " [1 2 3 23 24 34 26 40 28])

test: 2 ==> TAB

instead of failing crash emacs.

 -- 
Thierry Volpiatto
Gpg key: http://pgp.mit.edu/






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