RFC: mblen() return code when n is zero

[Rajalakshmi Srinivasaraghavan]

On 11/17/2014 09:57 PM, Rajalakshmi Srinivasaraghavan wrote:
>
> On 11/17/2014 09:53 PM, Paul Eggert wrote:
>> Rajalakshmi Srinivasaraghavan wrote:
>>> To get clarified on previous comments,What should mblen (mblen() calls
>>> __mbrtowc() internally)  return for the above testcase?
>>
>> There was no "above testcase" in your email, but I suppose mblen and 
>> mbtowc should return -1 when given empty inputs, as in this case the 
>> leading bytes of the input buffer do not form a valid multibyte 
>> character.  Although POSIX doesn't say what errno value to use, 
>> EILSEQ doesn't seem appropriate here.  What errno values do other C 
>> libraries use?  I'd be guided by that.
>>
> For testcase please refer:
> https://sourceware.org/ml/libc-alpha/2014-11/msg00191.html
>
Some of the functions to calculate the length like 
strnlen,wcsnlen,wcswidth return zero when input size n is passed as 0.
Considering that, mblen(str, 0) returning 0 seems to be valid. Hence I 
am dropping this patch.

-- 
Thanks
Rajalakshmi S