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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 3.74 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 http://www.kernel.org/doc/man-pages/.
GNU 1999-07-25 ISWUPPER(3)
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