DESCRIPTION

The iswlower() function is the wide-character equivalent of the islower(3) function. It tests whether wc is a wide character belonging to the wide-character class lower.

The wide-character class lower is a subclass of the wide-character class alpha, and therefore also a subclass of the wide-character class alnum, of the wide-character class graph and of the wide-character class print.

Being a subclass of the wide-character class print, the wide-character class lower is disjoint from the wide-character class cntrl.

Being a subclass of the wide-character class graph, the wide-character class lower is disjoint from the wide-character class space and its subclass blank.

Being a subclass of the wide-character class alnum, the wide-character class lower is disjoint from the wide-character class punct.

Being a subclass of the wide-character class alpha, the wide-character class lower is disjoint from the wide-character class digit.

The wide-character class lower contains at least those characters wc which are equal to towlower(wc) and different from towupper(wc).

The wide-character class lower always contains at least the letters _zsingle_quotesz_a_zsingle_quotesz_ to _zsingle_quotesz_z_zsingle_quotesz_.

RETURN VALUE

The iswlower() function returns nonzero if wc is a wide character belonging to the wide-character class lower. Otherwise, it returns zero.

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).

CONFORMING TO

POSIX.1-2001, POSIX.1-2008, C99.

NOTES

The behavior of iswlower() 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.

SEE ALSO

islower(3), iswctype(3), towlower(3)