1ISWUPPER(3)                Linux Programmer's Manual               ISWUPPER(3)
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NAME

6       iswupper - test for uppercase wide character
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SYNOPSIS

9       #include <wctype.h>
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11       int iswupper(wint_t wc);
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DESCRIPTION

14       The  iswupper()  function is the wide-character equivalent of the isup‐
15       per() function. It tests whether wc is a wide  character  belonging  to
16       the wide character class "upper".
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18       The  wide  character  class "upper" is a subclass of the wide character
19       class "alpha", and therefore also a  subclass  of  the  wide  character
20       class  "alnum",  of  the  wide  character class "graph" and of the wide
21       character class "print".
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23       Being a subclass of the wide character class "print", the wide  charac‐
24       ter class "upper" is disjoint from the wide character class "cntrl".
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26       Being  a subclass of the wide character class "graph", the wide charac‐
27       ter class "upper" is disjoint from the wide character class "space" and
28       its subclass "blank".
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30       Being  a subclass of the wide character class "alnum", the wide charac‐
31       ter class "upper" is disjoint from the wide character class "punct".
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33       Being a subclass of the wide character class "alpha", the wide  charac‐
34       ter class "upper" is disjoint from the wide character class "digit".
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36       The  wide character class "upper" contains at least those characters wc
37       which are equal to towupper(wc) and different from towlower(wc).
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39       The wide character class "upper" always contains at least  the  letters
40       'A' to 'Z'.
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RETURN VALUE

43       The  iswupper()  function  returns  non-zero  if wc is a wide character
44       belonging to the wide character class  "upper".  Otherwise  it  returns
45       zero.
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CONFORMING TO

48       C99.
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SEE ALSO

51       isupper(3), iswctype(3), towupper(3)
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NOTES

54       The  behaviour  of  iswupper()  depends on the LC_CTYPE category of the
55       current locale.
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57       This function is not very appropriate for dealing with Unicode  charac‐
58       ters,  because  Unicode knows about three cases: upper, lower and title
59       case.
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63GNU                               1999-07-25                       ISWUPPER(3)