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

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

NAME         top

       iswupper - test for uppercase wide character

SYNOPSIS         top

       #include <wctype.h>

       int iswupper(wint_t wc);

DESCRIPTION         top

       The iswupper() function is the wide-character equivalent of the
       isupper(3) function.  It tests whether wc is a wide character
       belonging to the wide-character class "upper".

       The wide-character class "upper" 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 "upper" is disjoint from the wide-character class
       "cntrl".

       Being a subclass of the wide-character class "graph", the wide-
       character class "upper" 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 "upper" is disjoint from the wide-character class
       "punct".

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

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

       The wide-character class "upper" always contains at least the letters
       'A' to 'Z'.

RETURN VALUE         top

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

ATTRIBUTES         top

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

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

CONFORMING TO         top

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

NOTES         top

       The behavior of iswupper() 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

       isupper(3), iswctype(3), towupper(3)

COLOPHON         top

       This page is part of release 4.08 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                              2015-08-08                      ISWUPPER(3)