Shell fits incorrect number of utf8 characters in a line

[anuchak]

Currently for rendering character on the embedded shell, we have a fixed size buffer in which to store the characters.
For ASCII all the characters are displayed till the end of the line and only then wrapped around.
For UTF-8 however, much lower number of characters are displayed in 1 line, the reason for this being they take up more no. of bytes in the buffer but lesser no. of characters.

The expected behaviour for this is, even for UTF-8 we display the right number of characters and only then wrap around.