On 8/28/2013 3:29 PM, Xue Fuqiao wrote:
I see. Thanks for all your replies!
BTW I have a further question:
On Wed, Aug 28, 2013 at 1:44 PM, Philippe Verdy <[email protected]> wrote:
- in UTF-8, you'll need to look backward between 1 to 3 positions before
your start position to find the leading 8-bit code unit (>= 0xC0).
Why should this be >=0xC0?
because all trailing bytes start with pattern 10xxxxxx which is <
1100000 for any value of x.
(The bits marked x can take any bit combination, while the first two
bits are constant).
So, if you see byte >= 0xC0 you know that you are on a leading byte.
(single bytes, those < 0x80 don't need any backup, if your pointer
points to one of them,
you are at a character boundary anyway).
A./
