towupper, towupper_l - convert a wide character to uppercase
The towupper() function is the wide-character equivalent of the toupper(3) function. If
wc is a lowercase wide character, and there exists an uppercase equivalent in the current locale, it returns the uppercase equivalent of
wc. In all other cases,
wc is returned unchanged.
The towupper_l() function performs the same task, but performs the conversion based on the character type information in the locale specified by
locale. The behavior of towupper_l() is undefined if
locale is the special locale object LC_GLOBAL_LOCALE (see duplocale(3)) or is not a valid locale object handle.
wc must be representable as a
wchar_t and be a valid character in the locale or be the value WEOF.
wc was convertible to uppercase, towupper() returns its uppercase equivalent; otherwise it returns
The behavior of these functions depends on the LC_CTYPE category of the locale.
These functions are not very appropriate for dealing with Unicode characters, because Unicode knows about three cases: upper, lower and title case.
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