tolower for characters with diacritics

[xwb]

Are there any standard routines that will convert characters with diacritics from upper to lowercase and vice-versa? Some of these differ by 0x20, others differ by 1.

For instance, is there anything that will convert from Ö to ö.

Also, is there anything that will convert o with all its different diacritics to o with no diacritic?

 

[Salem]

The details of what constitutes an uppercase or lowercase letter depend
on the current locale. For example, the default "C" locale does not
know about umlauts, so no conversion is done for them.

In some non ? English locales, there are lowercase letters with no cor?
responding uppercase equivalent; the German sharp s is one example.

SEE ALSO
isalpha(3), setlocale(3), locale(7)

Now depending on how well your OS/Compiler supports locales (and which ones it does support), this may or may not be a way forward. The general idea being by setting the right locale, you should get the effect you desire.

> Also, is there anything that will convert o with all its different diacritics to o with no diacritic?
A simple lookup table should suffice

if ( strchr( "Öö", ch ) ) return 'o'; else return ch;

--

 

[xwb]

I'm using lots of lookup tables at the moment: just wondering if there was a better method. Maybe space wise it isn't a much as I thought since Latin-1 doesn't have that many characters.