towlower, towlower_l - convert a wide character to lowercase
The towlower() function is the wide-character equivalent of the tolower(3) function. If
wc is an uppercase wide character, and there exists a lowercase equivalent in the current locale, it returns the lowercase equivalent of
wc. In all other cases,
wc is returned unchanged.
The towlower_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 towlower_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 lowercase, towlower() returns its lowercase 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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