Source_file: remove mbrtowc() in favor of utf8_char_len()

Source_file: remove mbrtowc() in favor of utf8_char_len()

- Move the routine to determine length of UTF-8 characters into a
separate function.

- Use this new function in Source_file::get_counts() instead of
the problematic mbrtowc() function.

- In get_counts(), revert the line_char variable to its original
behavior: keeping track of the character count, not the byte
offset.

- Introduce a new parameter to get_counts() to keep track of the
byte offset.

- Use the byte offset data in Source_file::quote_input() to make
sure the source line is split at the correct place.

- Remove outdated configure checks, since mbrtowc() is no longer
used.

[Neil Puttock, 2009-11-12 20:38:57]

Hi Patrick,

This looks fine to me.

Cheers,
Neil

[Patrick McCarty, 2009-11-13 00:41:15]

On 2009/11/12 20:38:57, Neil Puttock wrote:
> Hi Patrick,
> 
> This looks fine to me.

Thanks, Neil.  I pushed the patches.

-Patrick