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256 possible ASCII characters are enough to represent the wide array of international characters when we consider languages like Chinese Japanese Korean (CJK).
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iswupper(3) [bsd man page]

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

NAME
iswupper - test for uppercase wide character SYNOPSIS
#include <wctype.h> int iswupper(wint_t wc); DESCRIPTION
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
The iswupper() function returns nonzero if wc is a wide character belonging to the wide-character class "upper". Otherwise, it returns zero. ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +-----------+---------------+----------------+ |Interface | Attribute | Value | +-----------+---------------+----------------+ |iswupper() | Thread safety | MT-Safe locale | +-----------+---------------+----------------+ CONFORMING TO
POSIX.1-2001, POSIX.1-2008, C99. NOTES
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
isupper(3), iswctype(3), towupper(3) COLOPHON
This page is part of release 4.15 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)

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

NAME
iswupper - test for uppercase wide character SYNOPSIS
#include <wctype.h> int iswupper(wint_t wc); DESCRIPTION
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
The iswupper() function returns nonzero if wc is a wide character belonging to the wide-character class "upper". Otherwise it returns zero. CONFORMING TO
C99. NOTES
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
isupper(3), iswctype(3), towupper(3) COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. GNU
1999-07-25 ISWUPPER(3)

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