Re: [bug-libunistring] toCasefold?

[Simon Josefsson]

Bruno Haible <address@hidden> writes:

> Hi Simon,
>
>> I'm looking for an implementation of the toCasefold(X) operation defined
>> in Unicode 6.0 section 3.13 page 114 [1] like this:
>> 
>>   R4 toCasefold(X): Map each character C in X to Case_Folding(C).
>> 
>>   • Case_Folding(C) uses the mappings with the status field value “C” or
>>     “F” in the data file CaseFolding.txt in the Unicode Character
>>     Database.
>
> This function maps a string X to a sting.
>
>> Reading the manual I found this function:
>> 
>>  -- Function: uint32_t * u32_casefold (const uint32_t *S, size_t N,
>>           const char *ISO639_LANGUAGE, uninorm_t NF, uint32_t
>>           *RESULTBUF, size_t *LENGTHP)
>>      Returns the case folded string.
>> 
>> but I'm not sure what to use for ISO639_LANGUAGE
>
> If you want a locale independent case folding, you can use the empty string
> as ISO639_LANGUAGE.

But does u32_casefold match Unicode toCasefold?  Is it possible to
disable the SpecialCasing stuff?

/Simon