Linux 2.6 - man page for towupper (linux section 3)
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TOWUPPER(3) Linux Programmer's Manual TOWUPPER(3)
towupper - convert a wide character to uppercase
wint_t towupper(wint_t wc);
The towupper() function is the wide-character equivalent of the toupper(3) function. If
wc is a wide character, it is converted to uppercase. Characters which do not have case
are returned unchanged. If wc is WEOF, WEOF is returned.
The towupper() function returns the uppercase equivalent of wc, or WEOF if wc is WEOF.
The behavior of towupper() depends on the LC_CTYPE category of the current locale.
This function is not very appropriate for dealing with Unicode characters, because Unicode
knows about three cases: upper, lower and title case.
iswupper(3), towctrans(3), towlower(3)
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GNU 1999-07-25 TOWUPPER(3)
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