LC_CTYPE implementation help

[Aragon Gouveia]

Hi,

I am having difficulty understanding how an application can or should
implement gettext's LC_CTYPE category.

Specifically my questions are:

* how and where does a translator define the character types for a locale?
* how do functions like isalnum() hook into gettext to resolve whether
or not a character falls within the alnum ctype for the chosen locale?
* what does a programmer need to do to make sure ctype functions follow the
locale?


Thanks,
Aragon