towlower, towlower_l — convert a wide character to lowercase
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
wc is returned
performs the same task, but performs the conversion based on
the character type information in the locale specified by
locale. The behavior
towupper_l() is undefined if
locale is the special
(see duplocale(3)) or is not a
valid locale object handle.
must be representable as a wchar_t
and be a valid character in the locale or be the value
convertible to lowercase,
towlower() returns its lowercase
equivalent; otherwise it returns
For an explanation of the terms used in this section, see attributes(7).
||Thread safety||MT-Safe locale|
POSIX.1-2001 (XSI); present as an XSI extension in
POSIX.1-2008, but marked obsolete.
The behavior of these functions depends on the
LC_CTYPE category of the
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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