Originální popis anglicky:
iswlower - test for lowercase wide character
Návod, kniha: Linux Programmer's Manual
#include <wctype.h>
int iswlower(wint_t wc);
The
iswlower function is the wide-character equivalent of the
islower 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 non-zero if
wc is a wide character
belonging to the wide character class "lower". Otherwise it returns
zero.
ISO/ANSI C, UNIX98
islower(3),
iswctype(3),
towlower(3)
The behaviour 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.
