iswlower(3) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | CONFORMING TO | NOTES | SEE ALSO | COLOPHON

ISWLOWER(3)             Linux Programmer's Manual            ISWLOWER(3)

NAME         top

       iswlower - test for lowercase wide character

SYNOPSIS         top

       #include <wctype.h>

       int iswlower(wint_t wc);

DESCRIPTION         top

       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'.

RETURN VALUE         top

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

ATTRIBUTES         top

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

       ┌───────────────────────────────┬───────────────┬────────────────┐
       │Interface                      Attribute     Value          │
       ├───────────────────────────────┼───────────────┼────────────────┤
       │iswlower()                     │ Thread safety │ MT-Safe locale │
       └───────────────────────────────┴───────────────┴────────────────┘

CONFORMING TO         top

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

NOTES         top

       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         top

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

COLOPHON         top

       This page is part of release 5.13 of the Linux man-pages project.
       A description of the project, information about reporting bugs,
       and the latest version of this page, can be found at
       https://www.kernel.org/doc/man-pages/.

GNU                            2021-03-22                    ISWLOWER(3)

Pages that refer to this page: isalpha(3)iswctype(3)towlower(3)