iswlower - test for lowercase wide character
Standard C library (
libc,
-lc)
#include <wctype.h>
int iswlower(wint_t wc);
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
'a' to 'z'.
The
iswlower() function returns nonzero if
wc is a wide character
belonging to the wide-character class "lower". Otherwise, it returns
zero.
For an explanation of the terms used in this section, see
attributes(7).
Interface |
Attribute |
Value |
iswlower () |
Thread safety |
MT-Safe locale |
POSIX.1-2001, POSIX.1-2008, C99.
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.
islower(3),
iswctype(3),
towlower(3)