If invalid string should crash(was:string need to be robust)

[Kagamin]

Jussi Jumppanen Wrote:

> %u Wrote:
> 
> > I agree with a), but not b), Can't find anything in unicode standard says
> > you can use the low surrogate like that
> 
> According to: http://www.cl.cam.ac.uk/~mgk25/
> 
>     According to ISO 10646-1:2000, sections D.7 and 2.3c, a device
>     receiving UTF-8 shall interpret a "malformed sequence in the same way
>     that it interprets a character that is outside the adopted subset" and
>     "characters that are not within the adopted subset shall be indicated
>     to the user" by a receiving device. A quite commonly used approach in
>     UTF-8 decoders is to replace any malformed UTF-8 sequence by a
>     replacement character (U+FFFD), which looks a bit like an inverted
>     question mark, or a similar symbol. 
> 
> Refer to this file for the above quote: 
> 
> http://www.cl.cam.ac.uk/~mgk25/ucs/examples/UTF-8-test.txt

Sounds like a text rendering guideline rather than a text processing guideline.