[Asterisk-Dev] IAX spec: Text formats and character sets

[Kevin P. Fleming]

Michael Giagnocavo wrote:
> Hmm, you're right. That's doesn't look bad at all.
> 
> But... what about for comparisons and other Unicode operations? Do the
> libraries available support some UTF-8 version of strcmp, strchr,
> strcasecmp, etc.?
>

Some of them are easy (strcmp, for example). Most of them are harder, 
because they either need to know character boundaries, or need case 
mappings (strcasecmp, for example). Any function that searches for a 
'char' in a string also won't work if the character being searched for 
is a multi-byte one.

I think it's safe to document that the on-wire format is UTF-8, but that 
the current implementations only support the single-byte subset of 
UTF-8. Any implementation is free to be extended to fully support the 
entire UTF-8 character space, providing suitable libraries can be found 
(or written).