wconv(3C)

wconv: towupper, towlower -- translate characters

Synopsis

   #include <wctype.h>
   
   wint_t towupper(wint_t c);
   

   wint_t towlower(wint_t c);

Description

If the argument to towupper is a wide character that is also a lowercase letter, the result is the corresponding uppercase letter. If the argument to towlower is a wide character that is also an uppercase letter, the result is the corresponding lowercase letter.

In the case of all other arguments, the return value is unchanged.

References

conv(3C), wctype(3C)