iswlower(3) — Linux manual page

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | STANDARDS | HISTORY | NOTES | SEE ALSO

iswlower(3)             Library Functions Manual             iswlower(3)

NAME         top

       iswlower - test for lowercase wide character

LIBRARY         top

       Standard C library (libc, -lc)

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 │
       └───────────────────────────────┴───────────────┴────────────────┘

STANDARDS         top

       C11, POSIX.1-2008.

HISTORY         top

       POSIX.1-2001, 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)

Linux man-pages 6.04           2023-03-30                    iswlower(3)

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